diff options
Diffstat (limited to 'arch/tile')
| -rw-r--r-- | arch/tile/Kconfig | 12 | ||||
| -rw-r--r-- | arch/tile/include/asm/cacheflush.h | 52 | ||||
| -rw-r--r-- | arch/tile/include/asm/io.h | 15 | ||||
| -rw-r--r-- | arch/tile/include/asm/pci-bridge.h | 117 | ||||
| -rw-r--r-- | arch/tile/include/asm/pci.h | 107 | ||||
| -rw-r--r-- | arch/tile/include/asm/processor.h | 10 | ||||
| -rw-r--r-- | arch/tile/include/asm/signal.h | 2 | ||||
| -rw-r--r-- | arch/tile/include/hv/drv_xgbe_impl.h | 300 | ||||
| -rw-r--r-- | arch/tile/include/hv/drv_xgbe_intf.h | 615 | ||||
| -rw-r--r-- | arch/tile/include/hv/netio_errors.h | 122 | ||||
| -rw-r--r-- | arch/tile/include/hv/netio_intf.h | 2975 | ||||
| -rw-r--r-- | arch/tile/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/tile/kernel/compat_signal.c | 6 | ||||
| -rw-r--r-- | arch/tile/kernel/intvec_32.S | 24 | ||||
| -rw-r--r-- | arch/tile/kernel/pci.c | 621 | ||||
| -rw-r--r-- | arch/tile/kernel/process.c | 8 | ||||
| -rw-r--r-- | arch/tile/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/tile/kernel/signal.c | 10 | ||||
| -rw-r--r-- | arch/tile/lib/memchr_32.c | 35 | ||||
| -rw-r--r-- | arch/tile/lib/spinlock_32.c | 29 |
20 files changed, 4835 insertions, 228 deletions
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig index 07ec8a865c1d..e11b5fcb70eb 100644 --- a/arch/tile/Kconfig +++ b/arch/tile/Kconfig @@ -329,6 +329,18 @@ endmenu # Tilera-specific configuration menu "Bus options" +config PCI + bool "PCI support" + default y + select PCI_DOMAINS + ---help--- + Enable PCI root complex support, so PCIe endpoint devices can + be attached to the Tile chip. Many, but not all, PCI devices + are supported under Tilera's root complex driver. + +config PCI_DOMAINS + bool + config NO_IOMEM def_bool !PCI diff --git a/arch/tile/include/asm/cacheflush.h b/arch/tile/include/asm/cacheflush.h index c5741da4eeac..14a3f8556ace 100644 --- a/arch/tile/include/asm/cacheflush.h +++ b/arch/tile/include/asm/cacheflush.h @@ -137,4 +137,56 @@ static inline void finv_buffer(void *buffer, size_t size) mb_incoherent(); } +/* + * Flush & invalidate a VA range that is homed remotely on a single core, + * waiting until the memory controller holds the flushed values. + */ +static inline void finv_buffer_remote(void *buffer, size_t size) +{ + char *p; + int i; + + /* + * Flush and invalidate the buffer out of the local L1/L2 + * and request the home cache to flush and invalidate as well. + */ + __finv_buffer(buffer, size); + + /* + * Wait for the home cache to acknowledge that it has processed + * all the flush-and-invalidate requests. This does not mean + * that the flushed data has reached the memory controller yet, + * but it does mean the home cache is processing the flushes. + */ + __insn_mf(); + + /* + * Issue a load to the last cache line, which can't complete + * until all the previously-issued flushes to the same memory + * controller have also completed. If we weren't striping + * memory, that one load would be sufficient, but since we may + * be, we also need to back up to the last load issued to + * another memory controller, which would be the point where + * we crossed an 8KB boundary (the granularity of striping + * across memory controllers). Keep backing up and doing this + * until we are before the beginning of the buffer, or have + * hit all the controllers. + */ + for (i = 0, p = (char *)buffer + size - 1; + i < (1 << CHIP_LOG_NUM_MSHIMS()) && p >= (char *)buffer; + ++i) { + const unsigned long STRIPE_WIDTH = 8192; + + /* Force a load instruction to issue. */ + *(volatile char *)p; + + /* Jump to end of previous stripe. */ + p -= STRIPE_WIDTH; + p = (char *)((unsigned long)p | (STRIPE_WIDTH - 1)); + } + + /* Wait for the loads (and thus flushes) to have completed. */ + __insn_mf(); +} + #endif /* _ASM_TILE_CACHEFLUSH_H */ diff --git a/arch/tile/include/asm/io.h b/arch/tile/include/asm/io.h index ee43328713ab..d3cbb9b14cbe 100644 --- a/arch/tile/include/asm/io.h +++ b/arch/tile/include/asm/io.h @@ -55,9 +55,6 @@ extern void iounmap(volatile void __iomem *addr); #define ioremap_writethrough(physaddr, size) ioremap(physaddr, size) #define ioremap_fullcache(physaddr, size) ioremap(physaddr, size) -void __iomem *ioport_map(unsigned long port, unsigned int len); -extern inline void ioport_unmap(void __iomem *addr) {} - #define mmiowb() /* Conversion between virtual and physical mappings. */ @@ -189,12 +186,22 @@ static inline void memcpy_toio(volatile void __iomem *dst, const void *src, * we never run, uses them unconditionally. */ -static inline int ioport_panic(void) +static inline long ioport_panic(void) { panic("inb/outb and friends do not exist on tile"); return 0; } +static inline void __iomem *ioport_map(unsigned long port, unsigned int len) +{ + return (void __iomem *) ioport_panic(); +} + +static inline void ioport_unmap(void __iomem *addr) +{ + ioport_panic(); +} + static inline u8 inb(unsigned long addr) { return ioport_panic(); diff --git a/arch/tile/include/asm/pci-bridge.h b/arch/tile/include/asm/pci-bridge.h deleted file mode 100644 index e853b0e2793b..000000000000 --- a/arch/tile/include/asm/pci-bridge.h +++ /dev/null @@ -1,117 +0,0 @@ -/* - * Copyright 2010 Tilera Corporation. All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation, version 2. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for - * more details. - */ - -#ifndef _ASM_TILE_PCI_BRIDGE_H -#define _ASM_TILE_PCI_BRIDGE_H - -#include <linux/ioport.h> -#include <linux/pci.h> - -struct device_node; -struct pci_controller; - -/* - * pci_io_base returns the memory address at which you can access - * the I/O space for PCI bus number `bus' (or NULL on error). - */ -extern void __iomem *pci_bus_io_base(unsigned int bus); -extern unsigned long pci_bus_io_base_phys(unsigned int bus); -extern unsigned long pci_bus_mem_base_phys(unsigned int bus); - -/* Allocate a new PCI host bridge structure */ -extern struct pci_controller *pcibios_alloc_controller(void); - -/* Helper function for setting up resources */ -extern void pci_init_resource(struct resource *res, unsigned long start, - unsigned long end, int flags, char *name); - -/* Get the PCI host controller for a bus */ -extern struct pci_controller *pci_bus_to_hose(int bus); - -/* - * Structure of a PCI controller (host bridge) - */ -struct pci_controller { - int index; /* PCI domain number */ - struct pci_bus *root_bus; - - int first_busno; - int last_busno; - - int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */ - int hv_mem_fd; /* fd to Hypervisor for MMIO operations */ - - struct pci_ops *ops; - - int irq_base; /* Base IRQ from the Hypervisor */ - int plx_gen1; /* flag for PLX Gen 1 configuration */ - - /* Address ranges that are routed to this controller/bridge. */ - struct resource mem_resources[3]; -}; - -static inline struct pci_controller *pci_bus_to_host(struct pci_bus *bus) -{ - return bus->sysdata; -} - -extern void setup_indirect_pci_nomap(struct pci_controller *hose, - void __iomem *cfg_addr, void __iomem *cfg_data); -extern void setup_indirect_pci(struct pci_controller *hose, - u32 cfg_addr, u32 cfg_data); -extern void setup_grackle(struct pci_controller *hose); - -extern unsigned char common_swizzle(struct pci_dev *, unsigned char *); - -/* - * The following code swizzles for exactly one bridge. The routine - * common_swizzle below handles multiple bridges. But there are a - * some boards that don't follow the PCI spec's suggestion so we - * break this piece out separately. - */ -static inline unsigned char bridge_swizzle(unsigned char pin, - unsigned char idsel) -{ - return (((pin-1) + idsel) % 4) + 1; -} - -/* - * The following macro is used to lookup irqs in a standard table - * format for those PPC systems that do not already have PCI - * interrupts properly routed. - */ -/* FIXME - double check this */ -#define PCI_IRQ_TABLE_LOOKUP ({ \ - long _ctl_ = -1; \ - if (idsel >= min_idsel && idsel <= max_idsel && pin <= irqs_per_slot) \ - _ctl_ = pci_irq_table[idsel - min_idsel][pin-1]; \ - _ctl_; \ -}) - -/* - * Scan the buses below a given PCI host bridge and assign suitable - * resources to all devices found. - */ -extern int pciauto_bus_scan(struct pci_controller *, int); - -#ifdef CONFIG_PCI -extern unsigned long pci_address_to_pio(phys_addr_t address); -#else -static inline unsigned long pci_address_to_pio(phys_addr_t address) -{ - return (unsigned long)-1; -} -#endif - -#endif /* _ASM_TILE_PCI_BRIDGE_H */ diff --git a/arch/tile/include/asm/pci.h b/arch/tile/include/asm/pci.h index b0c15da2d5d5..c3fc458a0d32 100644 --- a/arch/tile/include/asm/pci.h +++ b/arch/tile/include/asm/pci.h @@ -15,7 +15,29 @@ #ifndef _ASM_TILE_PCI_H #define _ASM_TILE_PCI_H -#include <asm/pci-bridge.h> +#include <linux/pci.h> + +/* + * Structure of a PCI controller (host bridge) + */ +struct pci_controller { + int index; /* PCI domain number */ + struct pci_bus *root_bus; + + int first_busno; + int last_busno; + + int hv_cfg_fd[2]; /* config{0,1} fds for this PCIe controller */ + int hv_mem_fd; /* fd to Hypervisor for MMIO operations */ + + struct pci_ops *ops; + + int irq_base; /* Base IRQ from the Hypervisor */ + int plx_gen1; /* flag for PLX Gen 1 configuration */ + + /* Address ranges that are routed to this controller/bridge. */ + struct resource mem_resources[3]; +}; /* * The hypervisor maps the entirety of CPA-space as bus addresses, so @@ -24,56 +46,12 @@ */ #define PCI_DMA_BUS_IS_PHYS 1 -struct pci_controller *pci_bus_to_hose(int bus); -unsigned char __init common_swizzle(struct pci_dev *dev, unsigned char *pinp); int __init tile_pci_init(void); -void pci_iounmap(struct pci_dev *dev, void __iomem *addr); -void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); -void __devinit pcibios_fixup_bus(struct pci_bus *bus); -int __devinit _tile_cfg_read(struct pci_controller *hose, - int bus, - int slot, - int function, - int offset, - int size, - u32 *val); -int __devinit _tile_cfg_write(struct pci_controller *hose, - int bus, - int slot, - int function, - int offset, - int size, - u32 val); +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); +static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) {} -/* - * These are used to to config reads and writes in the early stages of - * setup before the driver infrastructure has been set up enough to be - * able to do config reads and writes. - */ -#define early_cfg_read(where, size, value) \ - _tile_cfg_read(controller, \ - current_bus, \ - pci_slot, \ - pci_fn, \ - where, \ - size, \ - value) - -#define early_cfg_write(where, size, value) \ - _tile_cfg_write(controller, \ - current_bus, \ - pci_slot, \ - pci_fn, \ - where, \ - size, \ - value) - - - -#define PCICFG_BYTE 1 -#define PCICFG_WORD 2 -#define PCICFG_DWORD 4 +void __devinit pcibios_fixup_bus(struct pci_bus *bus); #define TILE_NUM_PCIE 2 @@ -88,33 +66,33 @@ static inline int pci_proc_domain(struct pci_bus *bus) } /* - * I/O space is currently not supported. + * pcibios_assign_all_busses() tells whether or not the bus numbers + * should be reassigned, in case the BIOS didn't do it correctly, or + * in case we don't have a BIOS and we want to let Linux do it. */ +static inline int pcibios_assign_all_busses(void) +{ + return 1; +} -#define TILE_PCIE_LOWER_IO 0x0 -#define TILE_PCIE_UPPER_IO 0x10000 -#define TILE_PCIE_PCIE_IO_SIZE 0x0000FFFF - -#define _PAGE_NO_CACHE 0 -#define _PAGE_GUARDED 0 - - -#define pcibios_assign_all_busses() pci_assign_all_buses -extern int pci_assign_all_buses; - +/* + * No special bus mastering setup handling. + */ static inline void pcibios_set_master(struct pci_dev *dev) { - /* No special bus mastering setup handling */ } #define PCIBIOS_MIN_MEM 0 -#define PCIBIOS_MIN_IO TILE_PCIE_LOWER_IO +#define PCIBIOS_MIN_IO 0 /* * This flag tells if the platform is TILEmpower that needs * special configuration for the PLX switch chip. */ -extern int blade_pci; +extern int tile_plx_gen1; + +/* Use any cpu for PCI. */ +#define cpumask_of_pcibus(bus) cpu_online_mask /* implement the pci_ DMA API in terms of the generic device dma_ one */ #include <asm-generic/pci-dma-compat.h> @@ -122,7 +100,4 @@ extern int blade_pci; /* generic pci stuff */ #include <asm-generic/pci.h> -/* Use any cpu for PCI. */ -#define cpumask_of_pcibus(bus) cpu_online_mask - #endif /* _ASM_TILE_PCI_H */ diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h index 1747ff3946b2..a9e7c8760334 100644 --- a/arch/tile/include/asm/processor.h +++ b/arch/tile/include/asm/processor.h @@ -292,8 +292,18 @@ extern int kstack_hash; /* Are we using huge pages in the TLB for kernel data? */ extern int kdata_huge; +/* Support standard Linux prefetching. */ +#define ARCH_HAS_PREFETCH +#define prefetch(x) __builtin_prefetch(x) #define PREFETCH_STRIDE CHIP_L2_LINE_SIZE() +/* Bring a value into the L1D, faulting the TLB if necessary. */ +#ifdef __tilegx__ +#define prefetch_L1(x) __insn_prefetch_l1_fault((void *)(x)) +#else +#define prefetch_L1(x) __insn_prefetch_L1((void *)(x)) +#endif + #else /* __ASSEMBLY__ */ /* Do some slow action (e.g. read a slow SPR). */ diff --git a/arch/tile/include/asm/signal.h b/arch/tile/include/asm/signal.h index c1ee1d61d44c..81d92a45cd4b 100644 --- a/arch/tile/include/asm/signal.h +++ b/arch/tile/include/asm/signal.h @@ -25,7 +25,7 @@ #if defined(__KERNEL__) && !defined(__ASSEMBLY__) struct pt_regs; -int restore_sigcontext(struct pt_regs *, struct sigcontext __user *, long *); +int restore_sigcontext(struct pt_regs *, struct sigcontext __user *); int setup_sigcontext(struct sigcontext __user *, struct pt_regs *); void do_signal(struct pt_regs *regs); #endif diff --git a/arch/tile/include/hv/drv_xgbe_impl.h b/arch/tile/include/hv/drv_xgbe_impl.h new file mode 100644 index 000000000000..3a73b2b44913 --- /dev/null +++ b/arch/tile/include/hv/drv_xgbe_impl.h @@ -0,0 +1,300 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/** + * @file drivers/xgbe/impl.h + * Implementation details for the NetIO library. + */ + +#ifndef __DRV_XGBE_IMPL_H__ +#define __DRV_XGBE_IMPL_H__ + +#include <hv/netio_errors.h> +#include <hv/netio_intf.h> +#include <hv/drv_xgbe_intf.h> + + +/** How many groups we have (log2). */ +#define LOG2_NUM_GROUPS (12) +/** How many groups we have. */ +#define NUM_GROUPS (1 << LOG2_NUM_GROUPS) + +/** Number of output requests we'll buffer per tile. */ +#define EPP_REQS_PER_TILE (32) + +/** Words used in an eDMA command without checksum acceleration. */ +#define EDMA_WDS_NO_CSUM 8 +/** Words used in an eDMA command with checksum acceleration. */ +#define EDMA_WDS_CSUM 10 +/** Total available words in the eDMA command FIFO. */ +#define EDMA_WDS_TOTAL 128 + + +/* + * FIXME: These definitions are internal and should have underscores! + * NOTE: The actual numeric values here are intentional and allow us to + * optimize the concept "if small ... else if large ... else ...", by + * checking for the low bit being set, and then for non-zero. + * These are used as array indices, so they must have the values (0, 1, 2) + * in some order. + */ +#define SIZE_SMALL (1) /**< Small packet queue. */ +#define SIZE_LARGE (2) /**< Large packet queue. */ +#define SIZE_JUMBO (0) /**< Jumbo packet queue. */ + +/** The number of "SIZE_xxx" values. */ +#define NETIO_NUM_SIZES 3 + + +/* + * Default numbers of packets for IPP drivers. These values are chosen + * such that CIPP1 will not overflow its L2 cache. + */ + +/** The default number of small packets. */ +#define NETIO_DEFAULT_SMALL_PACKETS 2750 +/** The default number of large packets. */ +#define NETIO_DEFAULT_LARGE_PACKETS 2500 +/** The default number of jumbo packets. */ +#define NETIO_DEFAULT_JUMBO_PACKETS 250 + + +/** Log2 of the size of a memory arena. */ +#define NETIO_ARENA_SHIFT 24 /* 16 MB */ +/** Size of a memory arena. */ +#define NETIO_ARENA_SIZE (1 << NETIO_ARENA_SHIFT) + + +/** A queue of packets. + * + * This structure partially defines a queue of packets waiting to be + * processed. The queue as a whole is written to by an interrupt handler and + * read by non-interrupt code; this data structure is what's touched by the + * interrupt handler. The other part of the queue state, the read offset, is + * kept in user space, not in hypervisor space, so it is in a separate data + * structure. + * + * The read offset (__packet_receive_read in the user part of the queue + * structure) points to the next packet to be read. When the read offset is + * equal to the write offset, the queue is empty; therefore the queue must + * contain one more slot than the required maximum queue size. + * + * Here's an example of all 3 state variables and what they mean. All + * pointers move left to right. + * + * @code + * I I V V V V I I I I + * 0 1 2 3 4 5 6 7 8 9 10 + * ^ ^ ^ ^ + * | | | + * | | __last_packet_plus_one + * | __buffer_write + * __packet_receive_read + * @endcode + * + * This queue has 10 slots, and thus can hold 9 packets (_last_packet_plus_one + * = 10). The read pointer is at 2, and the write pointer is at 6; thus, + * there are valid, unread packets in slots 2, 3, 4, and 5. The remaining + * slots are invalid (do not contain a packet). + */ +typedef struct { + /** Byte offset of the next notify packet to be written: zero for the first + * packet on the queue, sizeof (netio_pkt_t) for the second packet on the + * queue, etc. */ + volatile uint32_t __packet_write; + + /** Offset of the packet after the last valid packet (i.e., when any + * pointer is incremented to this value, it wraps back to zero). */ + uint32_t __last_packet_plus_one; +} +__netio_packet_queue_t; + + +/** A queue of buffers. + * + * This structure partially defines a queue of empty buffers which have been + * obtained via requests to the IPP. (The elements of the queue are packet + * handles, which are transformed into a full netio_pkt_t when the buffer is + * retrieved.) The queue as a whole is written to by an interrupt handler and + * read by non-interrupt code; this data structure is what's touched by the + * interrupt handler. The other parts of the queue state, the read offset and + * requested write offset, are kept in user space, not in hypervisor space, so + * they are in a separate data structure. + * + * The read offset (__buffer_read in the user part of the queue structure) + * points to the next buffer to be read. When the read offset is equal to the + * write offset, the queue is empty; therefore the queue must contain one more + * slot than the required maximum queue size. + * + * The requested write offset (__buffer_requested_write in the user part of + * the queue structure) points to the slot which will hold the next buffer we + * request from the IPP, once we get around to sending such a request. When + * the requested write offset is equal to the write offset, no requests for + * new buffers are outstanding; when the requested write offset is one greater + * than the read offset, no more requests may be sent. + * + * Note that, unlike the packet_queue, the buffer_queue places incoming + * buffers at decreasing addresses. This makes the check for "is it time to + * wrap the buffer pointer" cheaper in the assembly code which receives new + * buffers, and means that the value which defines the queue size, + * __last_buffer, is different than in the packet queue. Also, the offset + * used in the packet_queue is already scaled by the size of a packet; here we + * use unscaled slot indices for the offsets. (These differences are + * historical, and in the future it's possible that the packet_queue will look + * more like this queue.) + * + * @code + * Here's an example of all 4 state variables and what they mean. Remember: + * all pointers move right to left. + * + * V V V I I R R V V V + * 0 1 2 3 4 5 6 7 8 9 + * ^ ^ ^ ^ + * | | | | + * | | | __last_buffer + * | | __buffer_write + * | __buffer_requested_write + * __buffer_read + * @endcode + * + * This queue has 10 slots, and thus can hold 9 buffers (_last_buffer = 9). + * The read pointer is at 2, and the write pointer is at 6; thus, there are + * valid, unread buffers in slots 2, 1, 0, 9, 8, and 7. The requested write + * pointer is at 4; thus, requests have been made to the IPP for buffers which + * will be placed in slots 6 and 5 when they arrive. Finally, the remaining + * slots are invalid (do not contain a buffer). + */ +typedef struct +{ + /** Ordinal number of the next buffer to be written: 0 for the first slot in + * the queue, 1 for the second slot in the queue, etc. */ + volatile uint32_t __buffer_write; + + /** Ordinal number of the last buffer (i.e., when any pointer is decremented + * below zero, it is reloaded with this value). */ + uint32_t __last_buffer; +} +__netio_buffer_queue_t; + + +/** + * An object for providing Ethernet packets to a process. + */ +typedef struct __netio_queue_impl_t +{ + /** The queue of packets waiting to be received. */ + __netio_packet_queue_t __packet_receive_queue; + /** The intr bit mask that IDs this device. */ + unsigned int __intr_id; + /** Offset to queues of empty buffers, one per size. */ + uint32_t __buffer_queue[NETIO_NUM_SIZES]; + /** The address of the first EPP tile, or -1 if no EPP. */ + /* ISSUE: Actually this is always "0" or "~0". */ + uint32_t __epp_location; + /** The queue ID that this queue represents. */ + unsigned int __queue_id; + /** Number of acknowledgements received. */ + volatile uint32_t __acks_received; + /** Last completion number received for packet_sendv. */ + volatile uint32_t __last_completion_rcv; + /** Number of packets allowed to be outstanding. */ + uint32_t __max_outstanding; + /** First VA available for packets. */ + void* __va_0; + /** First VA in second range available for packets. */ + void* __va_1; + /** Padding to align the "__packets" field to the size of a netio_pkt_t. */ + uint32_t __padding[3]; + /** The packets themselves. */ + netio_pkt_t __packets[0]; +} +netio_queue_impl_t; + + +/** + * An object for managing the user end of a NetIO queue. + */ +typedef struct __netio_queue_user_impl_t +{ + /** The next incoming packet to be read. */ + uint32_t __packet_receive_read; + /** The next empty buffers to be read, one index per size. */ + uint8_t __buffer_read[NETIO_NUM_SIZES]; + /** Where the empty buffer we next request from the IPP will go, one index + * per size. */ + uint8_t __buffer_requested_write[NETIO_NUM_SIZES]; + /** PCIe interface flag. */ + uint8_t __pcie; + /** Number of packets left to be received before we send a credit update. */ + uint32_t __receive_credit_remaining; + /** Value placed in __receive_credit_remaining when it reaches zero. */ + uint32_t __receive_credit_interval; + /** First fast I/O routine index. */ + uint32_t __fastio_index; + /** Number of acknowledgements expected. */ + uint32_t __acks_outstanding; + /** Last completion number requested. */ + uint32_t __last_completion_req; + /** File descriptor for driver. */ + int __fd; +} +netio_queue_user_impl_t; + + +#define NETIO_GROUP_CHUNK_SIZE 64 /**< Max # groups in one IPP request */ +#define NETIO_BUCKET_CHUNK_SIZE 64 /**< Max # buckets in one IPP request */ + + +/** Internal structure used to convey packet send information to the + * hypervisor. FIXME: Actually, it's not used for that anymore, but + * netio_packet_send() still uses it internally. + */ +typedef struct +{ + uint16_t flags; /**< Packet flags (__NETIO_SEND_FLG_xxx) */ + uint16_t transfer_size; /**< Size of packet */ + uint32_t va; /**< VA of start of packet */ + __netio_pkt_handle_t handle; /**< Packet handle */ + uint32_t csum0; /**< First checksum word */ + uint32_t csum1; /**< Second checksum word */ +} +__netio_send_cmd_t; + + +/** Flags used in two contexts: + * - As the "flags" member in the __netio_send_cmd_t, above; used only + * for netio_pkt_send_{prepare,commit}. + * - As part of the flags passed to the various send packet fast I/O calls. + */ + +/** Need acknowledgement on this packet. Note that some code in the + * normal send_pkt fast I/O handler assumes that this is equal to 1. */ +#define __NETIO_SEND_FLG_ACK 0x1 + +/** Do checksum on this packet. (Only used with the __netio_send_cmd_t; + * normal packet sends use a special fast I/O index to denote checksumming, + * and multi-segment sends test the checksum descriptor.) */ +#define __NETIO_SEND_FLG_CSUM 0x2 + +/** Get a completion on this packet. Only used with multi-segment sends. */ +#define __NETIO_SEND_FLG_COMPLETION 0x4 + +/** Position of the number-of-extra-segments value in the flags word. + Only used with multi-segment sends. */ +#define __NETIO_SEND_FLG_XSEG_SHIFT 3 + +/** Width of the number-of-extra-segments value in the flags word. */ +#define __NETIO_SEND_FLG_XSEG_WIDTH 2 + +#endif /* __DRV_XGBE_IMPL_H__ */ diff --git a/arch/tile/include/hv/drv_xgbe_intf.h b/arch/tile/include/hv/drv_xgbe_intf.h new file mode 100644 index 000000000000..146e47d5334b --- /dev/null +++ b/arch/tile/include/hv/drv_xgbe_intf.h @@ -0,0 +1,615 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/** + * @file drv_xgbe_intf.h + * Interface to the hypervisor XGBE driver. + */ + +#ifndef __DRV_XGBE_INTF_H__ +#define __DRV_XGBE_INTF_H__ + +/** + * An object for forwarding VAs and PAs to the hypervisor. + * @ingroup types + * + * This allows the supervisor to specify a number of areas of memory to + * store packet buffers. + */ +typedef struct +{ + /** The physical address of the memory. */ + HV_PhysAddr pa; + /** Page table entry for the memory. This is only used to derive the + * memory's caching mode; the PA bits are ignored. */ + HV_PTE pte; + /** The virtual address of the memory. */ + HV_VirtAddr va; + /** Size (in bytes) of the memory area. */ + int size; + +} +netio_ipp_address_t; + +/** The various pread/pwrite offsets into the hypervisor-level driver. + * @ingroup types + */ +typedef enum +{ + /** Inform the Linux driver of the address of the NetIO arena memory. + * This offset is actually only used to convey information from netio + * to the Linux driver; it never makes it from there to the hypervisor. + * Write-only; takes a uint32_t specifying the VA address. */ + NETIO_FIXED_ADDR = 0x5000000000000000ULL, + + /** Inform the Linux driver of the size of the NetIO arena memory. + * This offset is actually only used to convey information from netio + * to the Linux driver; it never makes it from there to the hypervisor. + * Write-only; takes a uint32_t specifying the VA size. */ + NETIO_FIXED_SIZE = 0x5100000000000000ULL, + + /** Register current tile with IPP. Write then read: write, takes a + * netio_input_config_t, read returns a pointer to a netio_queue_impl_t. */ + NETIO_IPP_INPUT_REGISTER_OFF = 0x6000000000000000ULL, + + /** Unregister current tile from IPP. Write-only, takes a dummy argument. */ + NETIO_IPP_INPUT_UNREGISTER_OFF = 0x6100000000000000ULL, + + /** Start packets flowing. Write-only, takes a dummy argument. */ + NETIO_IPP_INPUT_INIT_OFF = 0x6200000000000000ULL, + + /** Stop packets flowing. Write-only, takes a dummy argument. */ + NETIO_IPP_INPUT_UNINIT_OFF = 0x6300000000000000ULL, + + /** Configure group (typically we group on VLAN). Write-only: takes an + * array of netio_group_t's, low 24 bits of the offset is the base group + * number times the size of a netio_group_t. */ + NETIO_IPP_INPUT_GROUP_CFG_OFF = 0x6400000000000000ULL, + + /** Configure bucket. Write-only: takes an array of netio_bucket_t's, low + * 24 bits of the offset is the base bucket number times the size of a + * netio_bucket_t. */ + NETIO_IPP_INPUT_BUCKET_CFG_OFF = 0x6500000000000000ULL, + + /** Get/set a parameter. Read or write: read or write data is the parameter + * value, low 32 bits of the offset is a __netio_getset_offset_t. */ + NETIO_IPP_PARAM_OFF = 0x6600000000000000ULL, + + /** Get fast I/O index. Read-only; returns a 4-byte base index value. */ + NETIO_IPP_GET_FASTIO_OFF = 0x6700000000000000ULL, + + /** Configure hijack IP address. Packets with this IPv4 dest address + * go to bucket NETIO_NUM_BUCKETS - 1. Write-only: takes an IP address + * in some standard form. FIXME: Define the form! */ + NETIO_IPP_INPUT_HIJACK_CFG_OFF = 0x6800000000000000ULL, + + /** + * Offsets beyond this point are reserved for the supervisor (although that + * enforcement must be done by the supervisor driver itself). + */ + NETIO_IPP_USER_MAX_OFF = 0x6FFFFFFFFFFFFFFFULL, + + /** Register I/O memory. Write-only, takes a netio_ipp_address_t. */ + NETIO_IPP_IOMEM_REGISTER_OFF = 0x7000000000000000ULL, + + /** Unregister I/O memory. Write-only, takes a netio_ipp_address_t. */ + NETIO_IPP_IOMEM_UNREGISTER_OFF = 0x7100000000000000ULL, + + /* Offsets greater than 0x7FFFFFFF can't be used directly from Linux + * userspace code due to limitations in the pread/pwrite syscalls. */ + + /** Drain LIPP buffers. */ + NETIO_IPP_DRAIN_OFF = 0xFA00000000000000ULL, + + /** Supply a netio_ipp_address_t to be used as shared memory for the + * LEPP command queue. */ + NETIO_EPP_SHM_OFF = 0xFB00000000000000ULL, + + /* 0xFC... is currently unused. */ + + /** Stop IPP/EPP tiles. Write-only, takes a dummy argument. */ + NETIO_IPP_STOP_SHIM_OFF = 0xFD00000000000000ULL, + + /** Start IPP/EPP tiles. Write-only, takes a dummy argument. */ + NETIO_IPP_START_SHIM_OFF = 0xFE00000000000000ULL, + + /** Supply packet arena. Write-only, takes an array of + * netio_ipp_address_t values. */ + NETIO_IPP_ADDRESS_OFF = 0xFF00000000000000ULL, +} netio_hv_offset_t; + +/** Extract the base offset from an offset */ +#define NETIO_BASE_OFFSET(off) ((off) & 0xFF00000000000000ULL) +/** Extract the local offset from an offset */ +#define NETIO_LOCAL_OFFSET(off) ((off) & 0x00FFFFFFFFFFFFFFULL) + + +/** + * Get/set offset. + */ +typedef union +{ + struct + { + uint64_t addr:48; /**< Class-specific address */ + unsigned int class:8; /**< Class (e.g., NETIO_PARAM) */ + unsigned int opcode:8; /**< High 8 bits of NETIO_IPP_PARAM_OFF */ + } + bits; /**< Bitfields */ + uint64_t word; /**< Aggregated value to use as the offset */ +} +__netio_getset_offset_t; + +/** + * Fast I/O index offsets (must be contiguous). + */ +typedef enum +{ + NETIO_FASTIO_ALLOCATE = 0, /**< Get empty packet buffer */ + NETIO_FASTIO_FREE_BUFFER = 1, /**< Give buffer back to IPP */ + NETIO_FASTIO_RETURN_CREDITS = 2, /**< Give credits to IPP */ + NETIO_FASTIO_SEND_PKT_NOCK = 3, /**< Send a packet, no checksum */ + NETIO_FASTIO_SEND_PKT_CK = 4, /**< Send a packet, with checksum */ + NETIO_FASTIO_SEND_PKT_VEC = 5, /**< Send a vector of packets */ + NETIO_FASTIO_SENDV_PKT = 6, /**< Sendv one packet */ + NETIO_FASTIO_NUM_INDEX = 7, /**< Total number of fast I/O indices */ +} netio_fastio_index_t; + +/** 3-word return type for Fast I/O call. */ +typedef struct +{ + int err; /**< Error code. */ + uint32_t val0; /**< Value. Meaning depends upon the specific call. */ + uint32_t val1; /**< Value. Meaning depends upon the specific call. */ +} netio_fastio_rv3_t; + +/** 0-argument fast I/O call */ +int __netio_fastio0(uint32_t fastio_index); +/** 1-argument fast I/O call */ +int __netio_fastio1(uint32_t fastio_index, uint32_t arg0); +/** 3-argument fast I/O call, 2-word return value */ +netio_fastio_rv3_t __netio_fastio3_rv3(uint32_t fastio_index, uint32_t arg0, + uint32_t arg1, uint32_t arg2); +/** 4-argument fast I/O call */ +int __netio_fastio4(uint32_t fastio_index, uint32_t arg0, uint32_t arg1, + uint32_t arg2, uint32_t arg3); +/** 6-argument fast I/O call */ +int __netio_fastio6(uint32_t fastio_index, uint32_t arg0, uint32_t arg1, + uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5); +/** 9-argument fast I/O call */ +int __netio_fastio9(uint32_t fastio_index, uint32_t arg0, uint32_t arg1, + uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5, + uint32_t arg6, uint32_t arg7, uint32_t arg8); + +/** Allocate an empty packet. + * @param fastio_index Fast I/O index. + * @param size Size of the packet to allocate. + */ +#define __netio_fastio_allocate(fastio_index, size) \ + __netio_fastio1((fastio_index) + NETIO_FASTIO_ALLOCATE, size) + +/** Free a buffer. + * @param fastio_index Fast I/O index. + * @param handle Handle for the packet to free. + */ +#define __netio_fastio_free_buffer(fastio_index, handle) \ + __netio_fastio1((fastio_index) + NETIO_FASTIO_FREE_BUFFER, handle) + +/** Increment our receive credits. + * @param fastio_index Fast I/O index. + * @param credits Number of credits to add. + */ +#define __netio_fastio_return_credits(fastio_index, credits) \ + __netio_fastio1((fastio_index) + NETIO_FASTIO_RETURN_CREDITS, credits) + +/** Send packet, no checksum. + * @param fastio_index Fast I/O index. + * @param ackflag Nonzero if we want an ack. + * @param size Size of the packet. + * @param va Virtual address of start of packet. + * @param handle Packet handle. + */ +#define __netio_fastio_send_pkt_nock(fastio_index, ackflag, size, va, handle) \ + __netio_fastio4((fastio_index) + NETIO_FASTIO_SEND_PKT_NOCK, ackflag, \ + size, va, handle) + +/** Send packet, calculate checksum. + * @param fastio_index Fast I/O index. + * @param ackflag Nonzero if we want an ack. + * @param size Size of the packet. + * @param va Virtual address of start of packet. + * @param handle Packet handle. + * @param csum0 Shim checksum header. + * @param csum1 Checksum seed. + */ +#define __netio_fastio_send_pkt_ck(fastio_index, ackflag, size, va, handle, \ + csum0, csum1) \ + __netio_fastio6((fastio_index) + NETIO_FASTIO_SEND_PKT_CK, ackflag, \ + size, va, handle, csum0, csum1) + + +/** Format for the "csum0" argument to the __netio_fastio_send routines + * and LEPP. Note that this is currently exactly identical to the + * ShimProtocolOffloadHeader. + */ +typedef union +{ + struct + { + unsigned int start_byte:7; /**< The first byte to be checksummed */ + unsigned int count:14; /**< Number of bytes to be checksummed. */ + unsigned int destination_byte:7; /**< The byte to write the checksum to. */ + unsigned int reserved:4; /**< Reserved. */ + } bits; /**< Decomposed method of access. */ + unsigned int word; /**< To send out the IDN. */ +} __netio_checksum_header_t; + + +/** Sendv packet with 1 or 2 segments. + * @param fastio_index Fast I/O index. + * @param flags Ack/csum/notify flags in low 3 bits; number of segments minus + * 1 in next 2 bits; expected checksum in high 16 bits. + * @param confno Confirmation number to request, if notify flag set. + * @param csum0 Checksum descriptor; if zero, no checksum. + * @param va_F Virtual address of first segment. + * @param va_L Virtual address of last segment, if 2 segments. + * @param len_F_L Length of first segment in low 16 bits; length of last + * segment, if 2 segments, in high 16 bits. + */ +#define __netio_fastio_sendv_pkt_1_2(fastio_index, flags, confno, csum0, \ + va_F, va_L, len_F_L) \ + __netio_fastio6((fastio_index) + NETIO_FASTIO_SENDV_PKT, flags, confno, \ + csum0, va_F, va_L, len_F_L) + +/** Send packet on PCIe interface. + * @param fastio_index Fast I/O index. + * @param flags Ack/csum/notify flags in low 3 bits. + * @param confno Confirmation number to request, if notify flag set. + * @param csum0 Checksum descriptor; Hard wired 0, not needed for PCIe. + * @param va_F Virtual address of the packet buffer. + * @param va_L Virtual address of last segment, if 2 segments. Hard wired 0. + * @param len_F_L Length of the packet buffer in low 16 bits. + */ +#define __netio_fastio_send_pcie_pkt(fastio_index, flags, confno, csum0, \ + va_F, va_L, len_F_L) \ + __netio_fastio6((fastio_index) + PCIE_FASTIO_SENDV_PKT, flags, confno, \ + csum0, va_F, va_L, len_F_L) + +/** Sendv packet with 3 or 4 segments. + * @param fastio_index Fast I/O index. + * @param flags Ack/csum/notify flags in low 3 bits; number of segments minus + * 1 in next 2 bits; expected checksum in high 16 bits. + * @param confno Confirmation number to request, if notify flag set. + * @param csum0 Checksum descriptor; if zero, no checksum. + * @param va_F Virtual address of first segment. + * @param va_L Virtual address of last segment (third segment if 3 segments, + * fourth segment if 4 segments). + * @param len_F_L Length of first segment in low 16 bits; length of last + * segment in high 16 bits. + * @param va_M0 Virtual address of "middle 0" segment; this segment is sent + * second when there are three segments, and third if there are four. + * @param va_M1 Virtual address of "middle 1" segment; this segment is sent + * second when there are four segments. + * @param len_M0_M1 Length of middle 0 segment in low 16 bits; length of middle + * 1 segment, if 4 segments, in high 16 bits. + */ +#define __netio_fastio_sendv_pkt_3_4(fastio_index, flags, confno, csum0, va_F, \ + va_L, len_F_L, va_M0, va_M1, len_M0_M1) \ + __netio_fastio9((fastio_index) + NETIO_FASTIO_SENDV_PKT, flags, confno, \ + csum0, va_F, va_L, len_F_L, va_M0, va_M1, len_M0_M1) + +/** Send vector of packets. + * @param fastio_index Fast I/O index. + * @param seqno Number of packets transmitted so far on this interface; + * used to decide which packets should be acknowledged. + * @param nentries Number of entries in vector. + * @param va Virtual address of start of vector entry array. + * @return 3-word netio_fastio_rv3_t structure. The structure's err member + * is an error code, or zero if no error. The val0 member is the + * updated value of seqno; it has been incremented by 1 for each + * packet sent. That increment may be less than nentries if an + * error occured, or if some of the entries in the vector contain + * handles equal to NETIO_PKT_HANDLE_NONE. The val1 member is the + * updated value of nentries; it has been decremented by 1 for each + * vector entry processed. Again, that decrement may be less than + * nentries (leaving the returned value positive) if an error + * occurred. + */ +#define __netio_fastio_send_pkt_vec(fastio_index, seqno, nentries, va) \ + __netio_fastio3_rv3((fastio_index) + NETIO_FASTIO_SEND_PKT_VEC, seqno, \ + nentries, va) + + +/** An egress DMA command for LEPP. */ +typedef struct +{ + /** Is this a TSO transfer? + * + * NOTE: This field is always 0, to distinguish it from + * lepp_tso_cmd_t. It must come first! + */ + uint8_t tso : 1; + + /** Unused padding bits. */ + uint8_t _unused : 3; + + /** Should this packet be sent directly from caches instead of DRAM, + * using hash-for-home to locate the packet data? + */ + uint8_t hash_for_home : 1; + + /** Should we compute a checksum? */ + uint8_t compute_checksum : 1; + + /** Is this the final buffer for this packet? + * + * A single packet can be split over several input buffers (a "gather" + * operation). This flag indicates that this is the last buffer + * in a packet. + */ + uint8_t end_of_packet : 1; + + /** Should LEPP advance 'comp_busy' when this DMA is fully finished? */ + uint8_t send_completion : 1; + + /** High bits of Client Physical Address of the start of the buffer + * to be egressed. + * + * NOTE: Only 6 bits are actually needed here, as CPAs are + * currently 38 bits. So two bits could be scavenged from this. + */ + uint8_t cpa_hi; + + /** The number of bytes to be egressed. */ + uint16_t length; + + /** Low 32 bits of Client Physical Address of the start of the buffer + * to be egressed. + */ + uint32_t cpa_lo; + + /** Checksum information (only used if 'compute_checksum'). */ + __netio_checksum_header_t checksum_data; + +} lepp_cmd_t; + + +/** A chunk of physical memory for a TSO egress. */ +typedef struct +{ + /** The low bits of the CPA. */ + uint32_t cpa_lo; + /** The high bits of the CPA. */ + uint16_t cpa_hi : 15; + /** Should this packet be sent directly from caches instead of DRAM, + * using hash-for-home to locate the packet data? + */ + uint16_t hash_for_home : 1; + /** The length in bytes. */ + uint16_t length; +} lepp_frag_t; + + +/** An LEPP command that handles TSO. */ +typedef struct +{ + /** Is this a TSO transfer? + * + * NOTE: This field is always 1, to distinguish it from + * lepp_cmd_t. It must come first! + */ + uint8_t tso : 1; + + /** Unused padding bits. */ + uint8_t _unused : 7; + + /** Size of the header[] array in bytes. It must be in the range + * [40, 127], which are the smallest header for a TCP packet over + * Ethernet and the maximum possible prepend size supported by + * hardware, respectively. Note that the array storage must be + * padded out to a multiple of four bytes so that the following + * LEPP command is aligned properly. + */ + uint8_t header_size; + + /** Byte offset of the IP header in header[]. */ + uint8_t ip_offset; + + /** Byte offset of the TCP header in header[]. */ + uint8_t tcp_offset; + + /** The number of bytes to use for the payload of each packet, + * except of course the last one, which may not have enough bytes. + * This means that each Ethernet packet except the last will have a + * size of header_size + payload_size. + */ + uint16_t payload_size; + + /** The length of the 'frags' array that follows this struct. */ + uint16_t num_frags; + + /** The actual frags. */ + lepp_frag_t frags[0 /* Variable-sized; num_frags entries. */]; + + /* + * The packet header template logically follows frags[], + * but you can't declare that in C. + * + * uint32_t header[header_size_in_words_rounded_up]; + */ + +} lepp_tso_cmd_t; + + +/** An LEPP completion ring entry. */ +typedef void* lepp_comp_t; + + +/** Maximum number of frags for one TSO command. This is adapted from + * linux's "MAX_SKB_FRAGS", and presumably over-estimates by one, for + * our page size of exactly 65536. We add one for a "body" fragment. + */ +#define LEPP_MAX_FRAGS (65536 / HV_PAGE_SIZE_SMALL + 2 + 1) + +/** Total number of bytes needed for an lepp_tso_cmd_t. */ +#define LEPP_TSO_CMD_SIZE(num_frags, header_size) \ + (sizeof(lepp_tso_cmd_t) + \ + (num_frags) * sizeof(lepp_frag_t) + \ + (((header_size) + 3) & -4)) + +/** The size of the lepp "cmd" queue. */ +#define LEPP_CMD_QUEUE_BYTES \ + (((CHIP_L2_CACHE_SIZE() - 2 * CHIP_L2_LINE_SIZE()) / \ + (sizeof(lepp_cmd_t) + sizeof(lepp_comp_t))) * sizeof(lepp_cmd_t)) + +/** The largest possible command that can go in lepp_queue_t::cmds[]. */ +#define LEPP_MAX_CMD_SIZE LEPP_TSO_CMD_SIZE(LEPP_MAX_FRAGS, 128) + +/** The largest possible value of lepp_queue_t::cmd_{head, tail} (inclusive). + */ +#define LEPP_CMD_LIMIT \ + (LEPP_CMD_QUEUE_BYTES - LEPP_MAX_CMD_SIZE) + +/** The maximum number of completions in an LEPP queue. */ +#define LEPP_COMP_QUEUE_SIZE \ + ((LEPP_CMD_LIMIT + sizeof(lepp_cmd_t) - 1) / sizeof(lepp_cmd_t)) + +/** Increment an index modulo the queue size. */ +#define LEPP_QINC(var) \ + (var = __insn_mnz(var - (LEPP_COMP_QUEUE_SIZE - 1), var + 1)) + +/** A queue used to convey egress commands from the client to LEPP. */ +typedef struct +{ + /** Index of first completion not yet processed by user code. + * If this is equal to comp_busy, there are no such completions. + * + * NOTE: This is only read/written by the user. + */ + unsigned int comp_head; + + /** Index of first completion record not yet completed. + * If this is equal to comp_tail, there are no such completions. + * This index gets advanced (modulo LEPP_QUEUE_SIZE) whenever + * a command with the 'completion' bit set is finished. + * + * NOTE: This is only written by LEPP, only read by the user. + */ + volatile unsigned int comp_busy; + + /** Index of the first empty slot in the completion ring. + * Entries from this up to but not including comp_head (in ring order) + * can be filled in with completion data. + * + * NOTE: This is only read/written by the user. + */ + unsigned int comp_tail; + + /** Byte index of first command enqueued for LEPP but not yet processed. + * + * This is always divisible by sizeof(void*) and always <= LEPP_CMD_LIMIT. + * + * NOTE: LEPP advances this counter as soon as it no longer needs + * the cmds[] storage for this entry, but the transfer is not actually + * complete (i.e. the buffer pointed to by the command is no longer + * needed) until comp_busy advances. + * + * If this is equal to cmd_tail, the ring is empty. + * + * NOTE: This is only written by LEPP, only read by the user. + */ + volatile unsigned int cmd_head; + + /** Byte index of first empty slot in the command ring. This field can + * be incremented up to but not equal to cmd_head (because that would + * mean the ring is empty). + * + * This is always divisible by sizeof(void*) and always <= LEPP_CMD_LIMIT. + * + * NOTE: This is read/written by the user, only read by LEPP. + */ + volatile unsigned int cmd_tail; + + /** A ring of variable-sized egress DMA commands. + * + * NOTE: Only written by the user, only read by LEPP. + */ + char cmds[LEPP_CMD_QUEUE_BYTES] + __attribute__((aligned(CHIP_L2_LINE_SIZE()))); + + /** A ring of user completion data. + * NOTE: Only read/written by the user. + */ + lepp_comp_t comps[LEPP_COMP_QUEUE_SIZE] + __attribute__((aligned(CHIP_L2_LINE_SIZE()))); +} lepp_queue_t; + + +/** An internal helper function for determining the number of entries + * available in a ring buffer, given that there is one sentinel. + */ +static inline unsigned int +_lepp_num_free_slots(unsigned int head, unsigned int tail) +{ + /* + * One entry is reserved for use as a sentinel, to distinguish + * "empty" from "full". So we compute + * (head - tail - 1) % LEPP_QUEUE_SIZE, but without using a slow % operation. + */ + return (head - tail - 1) + ((head <= tail) ? LEPP_COMP_QUEUE_SIZE : 0); +} + + +/** Returns how many new comp entries can be enqueued. */ +static inline unsigned int +lepp_num_free_comp_slots(const lepp_queue_t* q) +{ + return _lepp_num_free_slots(q->comp_head, q->comp_tail); +} + +static inline int +lepp_qsub(int v1, int v2) +{ + int delta = v1 - v2; + return delta + ((delta >> 31) & LEPP_COMP_QUEUE_SIZE); +} + + +/** FIXME: Check this from linux, via a new "pwrite()" call. */ +#define LIPP_VERSION 1 + + +/** We use exactly two bytes of alignment padding. */ +#define LIPP_PACKET_PADDING 2 + +/** The minimum size of a "small" buffer (including the padding). */ +#define LIPP_SMALL_PACKET_SIZE 128 + +/* + * NOTE: The following two values should total to less than around + * 13582, to keep the total size used for "lipp_state_t" below 64K. + */ + +/** The maximum number of "small" buffers. + * This is enough for 53 network cpus with 128 credits. Note that + * if these are exhausted, we will fall back to using large buffers. + */ +#define LIPP_SMALL_BUFFERS 6785 + +/** The maximum number of "large" buffers. + * This is enough for 53 network cpus with 128 credits. + */ +#define LIPP_LARGE_BUFFERS 6785 + +#endif /* __DRV_XGBE_INTF_H__ */ diff --git a/arch/tile/include/hv/netio_errors.h b/arch/tile/include/hv/netio_errors.h new file mode 100644 index 000000000000..e1591bff61b5 --- /dev/null +++ b/arch/tile/include/hv/netio_errors.h @@ -0,0 +1,122 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/** + * Error codes returned from NetIO routines. + */ + +#ifndef __NETIO_ERRORS_H__ +#define __NETIO_ERRORS_H__ + +/** + * @addtogroup error + * + * @brief The error codes returned by NetIO functions. + * + * NetIO functions return 0 (defined as ::NETIO_NO_ERROR) on success, and + * a negative value if an error occurs. + * + * In cases where a NetIO function failed due to a error reported by + * system libraries, the error code will be the negation of the + * system errno at the time of failure. The @ref netio_strerror() + * function will deliver error strings for both NetIO and system error + * codes. + * + * @{ + */ + +/** The set of all NetIO errors. */ +typedef enum +{ + /** Operation successfully completed. */ + NETIO_NO_ERROR = 0, + + /** A packet was successfully retrieved from an input queue. */ + NETIO_PKT = 0, + + /** Largest NetIO error number. */ + NETIO_ERR_MAX = -701, + + /** The tile is not registered with the IPP. */ + NETIO_NOT_REGISTERED = -701, + + /** No packet was available to retrieve from the input queue. */ + NETIO_NOPKT = -702, + + /** The requested function is not implemented. */ + NETIO_NOT_IMPLEMENTED = -703, + + /** On a registration operation, the target queue already has the maximum + * number of tiles registered for it, and no more may be added. On a + * packet send operation, the output queue is full and nothing more can + * be queued until some of the queued packets are actually transmitted. */ + NETIO_QUEUE_FULL = -704, + + /** The calling process or thread is not bound to exactly one CPU. */ + NETIO_BAD_AFFINITY = -705, + + /** Cannot allocate memory on requested controllers. */ + NETIO_CANNOT_HOME = -706, + + /** On a registration operation, the IPP specified is not configured + * to support the options requested; for instance, the application + * wants a specific type of tagged headers which the configured IPP + * doesn't support. Or, the supplied configuration information is + * not self-consistent, or is out of range; for instance, specifying + * both NETIO_RECV and NETIO_NO_RECV, or asking for more than + * NETIO_MAX_SEND_BUFFERS to be preallocated. On a VLAN or bucket + * configure operation, the number of items, or the base item, was + * out of range. + */ + NETIO_BAD_CONFIG = -707, + + /** Too many tiles have registered to transmit packets. */ + NETIO_TOOMANY_XMIT = -708, + + /** Packet transmission was attempted on a queue which was registered + with transmit disabled. */ + NETIO_UNREG_XMIT = -709, + + /** This tile is already registered with the IPP. */ + NETIO_ALREADY_REGISTERED = -710, + + /** The Ethernet link is down. The application should try again later. */ + NETIO_LINK_DOWN = -711, + + /** An invalid memory buffer has been specified. This may be an unmapped + * virtual address, or one which does not meet alignment requirements. + * For netio_input_register(), this error may be returned when multiple + * processes specify different memory regions to be used for NetIO + * buffers. That can happen if these processes specify explicit memory + * regions with the ::NETIO_FIXED_BUFFER_VA flag, or if tmc_cmem_init() + * has not been called by a common ancestor of the processes. + */ + NETIO_FAULT = -712, + + /** Cannot combine user-managed shared memory and cache coherence. */ + NETIO_BAD_CACHE_CONFIG = -713, + + /** Smallest NetIO error number. */ + NETIO_ERR_MIN = -713, + +#ifndef __DOXYGEN__ + /** Used internally to mean that no response is needed; never returned to + * an application. */ + NETIO_NO_RESPONSE = 1 +#endif +} netio_error_t; + +/** @} */ + +#endif /* __NETIO_ERRORS_H__ */ diff --git a/arch/tile/include/hv/netio_intf.h b/arch/tile/include/hv/netio_intf.h new file mode 100644 index 000000000000..8d20972aba2c --- /dev/null +++ b/arch/tile/include/hv/netio_intf.h @@ -0,0 +1,2975 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +/** + * NetIO interface structures and macros. + */ + +#ifndef __NETIO_INTF_H__ +#define __NETIO_INTF_H__ + +#include <hv/netio_errors.h> + +#ifdef __KERNEL__ +#include <linux/types.h> +#else +#include <stdint.h> +#endif + +#if !defined(__HV__) && !defined(__BOGUX__) && !defined(__KERNEL__) +#include <assert.h> +#define netio_assert assert /**< Enable assertions from macros */ +#else +#define netio_assert(...) ((void)(0)) /**< Disable assertions from macros */ +#endif + +/* + * If none of these symbols are defined, we're building libnetio in an + * environment where we have pthreads, so we'll enable locking. + */ +#if !defined(__HV__) && !defined(__BOGUX__) && !defined(__KERNEL__) && \ + !defined(__NEWLIB__) +#define _NETIO_PTHREAD /**< Include a mutex in netio_queue_t below */ + +/* + * If NETIO_UNLOCKED is defined, we don't do use per-cpu locks on + * per-packet NetIO operations. We still do pthread locking on things + * like netio_input_register, though. This is used for building + * libnetio_unlocked. + */ +#ifndef NETIO_UNLOCKED + +/* Avoid PLT overhead by using our own inlined per-cpu lock. */ +#include <sched.h> +typedef int _netio_percpu_mutex_t; + +static __inline int +_netio_percpu_mutex_init(_netio_percpu_mutex_t* lock) +{ + *lock = 0; + return 0; +} + +static __inline int +_netio_percpu_mutex_lock(_netio_percpu_mutex_t* lock) +{ + while (__builtin_expect(__insn_tns(lock), 0)) + sched_yield(); + return 0; +} + +static __inline int +_netio_percpu_mutex_unlock(_netio_percpu_mutex_t* lock) +{ + *lock = 0; + return 0; +} + +#else /* NETIO_UNLOCKED */ + +/* Don't do any locking for per-packet NetIO operations. */ +typedef int _netio_percpu_mutex_t; +#define _netio_percpu_mutex_init(L) +#define _netio_percpu_mutex_lock(L) +#define _netio_percpu_mutex_unlock(L) + +#endif /* NETIO_UNLOCKED */ +#endif /* !__HV__, !__BOGUX, !__KERNEL__, !__NEWLIB__ */ + +/** How many tiles can register for a given queue. + * @ingroup setup */ +#define NETIO_MAX_TILES_PER_QUEUE 64 + + +/** Largest permissible queue identifier. + * @ingroup setup */ +#define NETIO_MAX_QUEUE_ID 255 + + +#ifndef __DOXYGEN__ + +/* Metadata packet checksum/ethertype flags. */ + +/** The L4 checksum has not been calculated. */ +#define _NETIO_PKT_NO_L4_CSUM_SHIFT 0 +#define _NETIO_PKT_NO_L4_CSUM_RMASK 1 +#define _NETIO_PKT_NO_L4_CSUM_MASK \ + (_NETIO_PKT_NO_L4_CSUM_RMASK << _NETIO_PKT_NO_L4_CSUM_SHIFT) + +/** The L3 checksum has not been calculated. */ +#define _NETIO_PKT_NO_L3_CSUM_SHIFT 1 +#define _NETIO_PKT_NO_L3_CSUM_RMASK 1 +#define _NETIO_PKT_NO_L3_CSUM_MASK \ + (_NETIO_PKT_NO_L3_CSUM_RMASK << _NETIO_PKT_NO_L3_CSUM_SHIFT) + +/** The L3 checksum is incorrect (or perhaps has not been calculated). */ +#define _NETIO_PKT_BAD_L3_CSUM_SHIFT 2 +#define _NETIO_PKT_BAD_L3_CSUM_RMASK 1 +#define _NETIO_PKT_BAD_L3_CSUM_MASK \ + (_NETIO_PKT_BAD_L3_CSUM_RMASK << _NETIO_PKT_BAD_L3_CSUM_SHIFT) + +/** The Ethernet packet type is unrecognized. */ +#define _NETIO_PKT_TYPE_UNRECOGNIZED_SHIFT 3 +#define _NETIO_PKT_TYPE_UNRECOGNIZED_RMASK 1 +#define _NETIO_PKT_TYPE_UNRECOGNIZED_MASK \ + (_NETIO_PKT_TYPE_UNRECOGNIZED_RMASK << \ + _NETIO_PKT_TYPE_UNRECOGNIZED_SHIFT) + +/* Metadata packet type flags. */ + +/** Where the packet type bits are; this field is the index into + * _netio_pkt_info. */ +#define _NETIO_PKT_TYPE_SHIFT 4 +#define _NETIO_PKT_TYPE_RMASK 0x3F + +/** How many VLAN tags the packet has, and, if we have two, which one we + * actually grouped on. A VLAN within a proprietary (Marvell or Broadcom) + * tag is counted here. */ +#define _NETIO_PKT_VLAN_SHIFT 4 +#define _NETIO_PKT_VLAN_RMASK 0x3 +#define _NETIO_PKT_VLAN_MASK \ + (_NETIO_PKT_VLAN_RMASK << _NETIO_PKT_VLAN_SHIFT) +#define _NETIO_PKT_VLAN_NONE 0 /* No VLAN tag. */ +#define _NETIO_PKT_VLAN_ONE 1 /* One VLAN tag. */ +#define _NETIO_PKT_VLAN_TWO_OUTER 2 /* Two VLAN tags, outer one used. */ +#define _NETIO_PKT_VLAN_TWO_INNER 3 /* Two VLAN tags, inner one used. */ + +/** Which proprietary tags the packet has. */ +#define _NETIO_PKT_TAG_SHIFT 6 +#define _NETIO_PKT_TAG_RMASK 0x3 +#define _NETIO_PKT_TAG_MASK \ + (_NETIO_PKT_TAG_RMASK << _NETIO_PKT_TAG_SHIFT) +#define _NETIO_PKT_TAG_NONE 0 /* No proprietary tags. */ +#define _NETIO_PKT_TAG_MRVL 1 /* Marvell HyperG.Stack tags. */ +#define _NETIO_PKT_TAG_MRVL_EXT 2 /* HyperG.Stack extended tags. */ +#define _NETIO_PKT_TAG_BRCM 3 /* Broadcom HiGig tags. */ + +/** Whether a packet has an LLC + SNAP header. */ +#define _NETIO_PKT_SNAP_SHIFT 8 +#define _NETIO_PKT_SNAP_RMASK 0x1 +#define _NETIO_PKT_SNAP_MASK \ + (_NETIO_PKT_SNAP_RMASK << _NETIO_PKT_SNAP_SHIFT) + +/* NOTE: Bits 9 and 10 are unused. */ + +/** Length of any custom data before the L2 header, in words. */ +#define _NETIO_PKT_CUSTOM_LEN_SHIFT 11 +#define _NETIO_PKT_CUSTOM_LEN_RMASK 0x1F +#define _NETIO_PKT_CUSTOM_LEN_MASK \ + (_NETIO_PKT_CUSTOM_LEN_RMASK << _NETIO_PKT_CUSTOM_LEN_SHIFT) + +/** The L4 checksum is incorrect (or perhaps has not been calculated). */ +#define _NETIO_PKT_BAD_L4_CSUM_SHIFT 16 +#define _NETIO_PKT_BAD_L4_CSUM_RMASK 0x1 +#define _NETIO_PKT_BAD_L4_CSUM_MASK \ + (_NETIO_PKT_BAD_L4_CSUM_RMASK << _NETIO_PKT_BAD_L4_CSUM_SHIFT) + +/** Length of the L2 header, in words. */ +#define _NETIO_PKT_L2_LEN_SHIFT 17 +#define _NETIO_PKT_L2_LEN_RMASK 0x1F +#define _NETIO_PKT_L2_LEN_MASK \ + (_NETIO_PKT_L2_LEN_RMASK << _NETIO_PKT_L2_LEN_SHIFT) + + +/* Flags in minimal packet metadata. */ + +/** We need an eDMA checksum on this packet. */ +#define _NETIO_PKT_NEED_EDMA_CSUM_SHIFT 0 +#define _NETIO_PKT_NEED_EDMA_CSUM_RMASK 1 +#define _NETIO_PKT_NEED_EDMA_CSUM_MASK \ + (_NETIO_PKT_NEED_EDMA_CSUM_RMASK << _NETIO_PKT_NEED_EDMA_CSUM_SHIFT) + +/* Data within the packet information table. */ + +/* Note that, for efficiency, code which uses these fields assumes that none + * of the shift values below are zero. See uses below for an explanation. */ + +/** Offset within the L2 header of the innermost ethertype (in halfwords). */ +#define _NETIO_PKT_INFO_ETYPE_SHIFT 6 +#define _NETIO_PKT_INFO_ETYPE_RMASK 0x1F + +/** Offset within the L2 header of the VLAN tag (in halfwords). */ +#define _NETIO_PKT_INFO_VLAN_SHIFT 11 +#define _NETIO_PKT_INFO_VLAN_RMASK 0x1F + +#endif + + +/** The size of a memory buffer representing a small packet. + * @ingroup egress */ +#define SMALL_PACKET_SIZE 256 + +/** The size of a memory buffer representing a large packet. + * @ingroup egress */ +#define LARGE_PACKET_SIZE 2048 + +/** The size of a memory buffer representing a jumbo packet. + * @ingroup egress */ +#define JUMBO_PACKET_SIZE (12 * 1024) + + +/* Common ethertypes. + * @ingroup ingress */ +/** @{ */ +/** The ethertype of IPv4. */ +#define ETHERTYPE_IPv4 (0x0800) +/** The ethertype of ARP. */ +#define ETHERTYPE_ARP (0x0806) +/** The ethertype of VLANs. */ +#define ETHERTYPE_VLAN (0x8100) +/** The ethertype of a Q-in-Q header. */ +#define ETHERTYPE_Q_IN_Q (0x9100) +/** The ethertype of IPv6. */ +#define ETHERTYPE_IPv6 (0x86DD) +/** The ethertype of MPLS. */ +#define ETHERTYPE_MPLS (0x8847) +/** @} */ + + +/** The possible return values of NETIO_PKT_STATUS. + * @ingroup ingress + */ +typedef enum +{ + /** No problems were detected with this packet. */ + NETIO_PKT_STATUS_OK, + /** The packet is undersized; this is expected behavior if the packet's + * ethertype is unrecognized, but otherwise the packet is likely corrupt. */ + NETIO_PKT_STATUS_UNDERSIZE, + /** The packet is oversized and some trailing bytes have been discarded. + This is expected behavior for short packets, since it's impossible to + precisely determine the amount of padding which may have been added to + them to make them meet the minimum Ethernet packet size. */ + NETIO_PKT_STATUS_OVERSIZE, + /** The packet was judged to be corrupt by hardware (for instance, it had + a bad CRC, or part of it was discarded due to lack of buffer space in + the I/O shim) and should be discarded. */ + NETIO_PKT_STATUS_BAD +} netio_pkt_status_t; + + +/** Log2 of how many buckets we have. */ +#define NETIO_LOG2_NUM_BUCKETS (10) + +/** How many buckets we have. + * @ingroup ingress */ +#define NETIO_NUM_BUCKETS (1 << NETIO_LOG2_NUM_BUCKETS) + + +/** + * @brief A group-to-bucket identifier. + * + * @ingroup setup + * + * This tells us what to do with a given group. + */ +typedef union { + /** The header broken down into bits. */ + struct { + /** Whether we should balance on L4, if available */ + unsigned int __balance_on_l4:1; + /** Whether we should balance on L3, if available */ + unsigned int __balance_on_l3:1; + /** Whether we should balance on L2, if available */ + unsigned int __balance_on_l2:1; + /** Reserved for future use */ + unsigned int __reserved:1; + /** The base bucket to use to send traffic */ + unsigned int __bucket_base:NETIO_LOG2_NUM_BUCKETS; + /** The mask to apply to the balancing value. This must be one less + * than a power of two, e.g. 0x3 or 0xFF. + */ + unsigned int __bucket_mask:NETIO_LOG2_NUM_BUCKETS; + /** Pad to 32 bits */ + unsigned int __padding:(32 - 4 - 2 * NETIO_LOG2_NUM_BUCKETS); + } bits; + /** To send out the IDN. */ + unsigned int word; +} +netio_group_t; + + +/** + * @brief A VLAN-to-bucket identifier. + * + * @ingroup setup + * + * This tells us what to do with a given VLAN. + */ +typedef netio_group_t netio_vlan_t; + + +/** + * A bucket-to-queue mapping. + * @ingroup setup + */ +typedef unsigned char netio_bucket_t; + + +/** + * A packet size can always fit in a netio_size_t. + * @ingroup setup + */ +typedef unsigned int netio_size_t; + + +/** + * @brief Ethernet standard (ingress) packet metadata. + * + * @ingroup ingress + * + * This is additional data associated with each packet. + * This structure is opaque and accessed through the @ref ingress. + * + * Also, the buffer population operation currently assumes that standard + * metadata is at least as large as minimal metadata, and will need to be + * modified if that is no longer the case. + */ +typedef struct +{ +#ifdef __DOXYGEN__ + /** This structure is opaque. */ + unsigned char opaque[24]; +#else + /** The overall ordinal of the packet */ + unsigned int __packet_ordinal; + /** The ordinal of the packet within the group */ + unsigned int __group_ordinal; + /** The best flow hash IPP could compute. */ + unsigned int __flow_hash; + /** Flags pertaining to checksum calculation, packet type, etc. */ + unsigned int __flags; + /** The first word of "user data". */ + unsigned int __user_data_0; + /** The second word of "user data". */ + unsigned int __user_data_1; +#endif +} +netio_pkt_metadata_t; + + +/** To ensure that the L3 header is aligned mod 4, the L2 header should be + * aligned mod 4 plus 2, since every supported L2 header is 4n + 2 bytes + * long. The standard way to do this is to simply add 2 bytes of padding + * before the L2 header. + */ +#define NETIO_PACKET_PADDING 2 + + + +/** + * @brief Ethernet minimal (egress) packet metadata. + * + * @ingroup egress + * + * This structure represents information about packets which have + * been processed by @ref netio_populate_buffer() or + * @ref netio_populate_prepend_buffer(). This structure is opaque + * and accessed through the @ref egress. + * + * @internal This structure is actually copied into the memory used by + * standard metadata, which is assumed to be large enough. + */ +typedef struct +{ +#ifdef __DOXYGEN__ + /** This structure is opaque. */ + unsigned char opaque[14]; +#else + /** The offset of the L2 header from the start of the packet data. */ + unsigned short l2_offset; + /** The offset of the L3 header from the start of the packet data. */ + unsigned short l3_offset; + /** Where to write the checksum. */ + unsigned char csum_location; + /** Where to start checksumming from. */ + unsigned char csum_start; + /** Flags pertaining to checksum calculation etc. */ + unsigned short flags; + /** The L2 length of the packet. */ + unsigned short l2_length; + /** The checksum with which to seed the checksum generator. */ + unsigned short csum_seed; + /** How much to checksum. */ + unsigned short csum_length; +#endif +} +netio_pkt_minimal_metadata_t; + + +#ifndef __DOXYGEN__ + +/** + * @brief An I/O notification header. + * + * This is the first word of data received from an I/O shim in a notification + * packet. It contains framing and status information. + */ +typedef union +{ + unsigned int word; /**< The whole word. */ + /** The various fields. */ + struct + { + unsigned int __channel:7; /**< Resource channel. */ + unsigned int __type:4; /**< Type. */ + unsigned int __ack:1; /**< Whether an acknowledgement is needed. */ + unsigned int __reserved:1; /**< Reserved. */ + unsigned int __protocol:1; /**< A protocol-specific word is added. */ + unsigned int __status:2; /**< Status of the transfer. */ + unsigned int __framing:2; /**< Framing of the transfer. */ + unsigned int __transfer_size:14; /**< Transfer size in bytes (total). */ + } bits; +} +__netio_pkt_notif_t; + + +/** + * Returns the base address of the packet. + */ +#define _NETIO_PKT_HANDLE_BASE(p) \ + ((unsigned char*)((p).word & 0xFFFFFFC0)) + +/** + * Returns the base address of the packet. + */ +#define _NETIO_PKT_BASE(p) \ + _NETIO_PKT_HANDLE_BASE(p->__packet) + +/** + * @brief An I/O notification packet (second word) + * + * This is the second word of data received from an I/O shim in a notification + * packet. This is the virtual address of the packet buffer, plus some flag + * bits. (The virtual address of the packet is always 256-byte aligned so we + * have room for 8 bits' worth of flags in the low 8 bits.) + * + * @internal + * NOTE: The low two bits must contain "__queue", so the "packet size" + * (SIZE_SMALL, SIZE_LARGE, or SIZE_JUMBO) can be determined quickly. + * + * If __addr or __offset are moved, _NETIO_PKT_BASE + * (defined right below this) must be changed. + */ +typedef union +{ + unsigned int word; /**< The whole word. */ + /** The various fields. */ + struct + { + /** Which queue the packet will be returned to once it is sent back to + the IPP. This is one of the SIZE_xxx values. */ + unsigned int __queue:2; + + /** The IPP handle of the sending IPP. */ + unsigned int __ipp_handle:2; + + /** Reserved for future use. */ + unsigned int __reserved:1; + + /** If 1, this packet has minimal (egress) metadata; otherwise, it + has standard (ingress) metadata. */ + unsigned int __minimal:1; + + /** Offset of the metadata within the packet. This value is multiplied + * by 64 and added to the base packet address to get the metadata + * address. Note that this field is aligned within the word such that + * you can easily extract the metadata address with a 26-bit mask. */ + unsigned int __offset:2; + + /** The top 24 bits of the packet's virtual address. */ + unsigned int __addr:24; + } bits; +} +__netio_pkt_handle_t; + +#endif /* !__DOXYGEN__ */ + + +/** + * @brief A handle for an I/O packet's storage. + * @ingroup ingress + * + * netio_pkt_handle_t encodes the concept of a ::netio_pkt_t with its + * packet metadata removed. It is a much smaller type that exists to + * facilitate applications where the full ::netio_pkt_t type is too + * large, such as those that cache enormous numbers of packets or wish + * to transmit packet descriptors over the UDN. + * + * Because there is no metadata, most ::netio_pkt_t operations cannot be + * performed on a netio_pkt_handle_t. It supports only + * netio_free_handle() (to free the buffer) and + * NETIO_PKT_CUSTOM_DATA_H() (to access a pointer to its contents). + * The application must acquire any additional metadata it wants from the + * original ::netio_pkt_t and record it separately. + * + * A netio_pkt_handle_t can be extracted from a ::netio_pkt_t by calling + * NETIO_PKT_HANDLE(). An invalid handle (analogous to NULL) can be + * created by assigning the value ::NETIO_PKT_HANDLE_NONE. A handle can + * be tested for validity with NETIO_PKT_HANDLE_IS_VALID(). + */ +typedef struct +{ + unsigned int word; /**< Opaque bits. */ +} netio_pkt_handle_t; + +/** + * @brief A packet descriptor. + * + * @ingroup ingress + * @ingroup egress + * + * This data structure represents a packet. The structure is manipulated + * through the @ref ingress and the @ref egress. + * + * While the contents of a netio_pkt_t are opaque, the structure itself is + * portable. This means that it may be shared between all tiles which have + * done a netio_input_register() call for the interface on which the pkt_t + * was initially received (via netio_get_packet()) or retrieved (via + * netio_get_buffer()). The contents of a netio_pkt_t can be transmitted to + * another tile via shared memory, or via a UDN message, or by other means. + * The destination tile may then use the pkt_t as if it had originally been + * received locally; it may read or write the packet's data, read its + * metadata, free the packet, send the packet, transfer the netio_pkt_t to + * yet another tile, and so forth. + * + * Once a netio_pkt_t has been transferred to a second tile, the first tile + * should not reference the original copy; in particular, if more than one + * tile frees or sends the same netio_pkt_t, the IPP's packet free lists will + * become corrupted. Note also that each tile which reads or modifies + * packet data must obey the memory coherency rules outlined in @ref input. + */ +typedef struct +{ +#ifdef __DOXYGEN__ + /** This structure is opaque. */ + unsigned char opaque[32]; +#else + /** For an ingress packet (one with standard metadata), this is the + * notification header we got from the I/O shim. For an egress packet + * (one with minimal metadata), this word is zero if the packet has not + * been populated, and nonzero if it has. */ + __netio_pkt_notif_t __notif_header; + + /** Virtual address of the packet buffer, plus state flags. */ + __netio_pkt_handle_t __packet; + + /** Metadata associated with the packet. */ + netio_pkt_metadata_t __metadata; +#endif +} +netio_pkt_t; + + +#ifndef __DOXYGEN__ + +#define __NETIO_PKT_NOTIF_HEADER(pkt) ((pkt)->__notif_header) +#define __NETIO_PKT_IPP_HANDLE(pkt) ((pkt)->__packet.bits.__ipp_handle) +#define __NETIO_PKT_QUEUE(pkt) ((pkt)->__packet.bits.__queue) +#define __NETIO_PKT_NOTIF_HEADER_M(mda, pkt) ((pkt)->__notif_header) +#define __NETIO_PKT_IPP_HANDLE_M(mda, pkt) ((pkt)->__packet.bits.__ipp_handle) +#define __NETIO_PKT_MINIMAL(pkt) ((pkt)->__packet.bits.__minimal) +#define __NETIO_PKT_QUEUE_M(mda, pkt) ((pkt)->__packet.bits.__queue) +#define __NETIO_PKT_FLAGS_M(mda, pkt) ((mda)->__flags) + +/* Packet information table, used by the attribute access functions below. */ +extern const uint16_t _netio_pkt_info[]; + +#endif /* __DOXYGEN__ */ + + +#ifndef __DOXYGEN__ +/* These macros are deprecated and will disappear in a future MDE release. */ +#define NETIO_PKT_GOOD_CHECKSUM(pkt) \ + NETIO_PKT_L4_CSUM_CORRECT(pkt) +#define NETIO_PKT_GOOD_CHECKSUM_M(mda, pkt) \ + NETIO_PKT_L4_CSUM_CORRECT_M(mda, pkt) +#endif /* __DOXYGEN__ */ + + +/* Packet attribute access functions. */ + +/** Return a pointer to the metadata for a packet. + * @ingroup ingress + * + * Calling this function once and passing the result to other retrieval + * functions with a "_M" suffix usually improves performance. This + * function must be called on an 'ingress' packet (i.e. one retrieved + * by @ref netio_get_packet(), on which @ref netio_populate_buffer() or + * @ref netio_populate_prepend_buffer have not been called). Use of this + * function on an 'egress' packet will cause an assertion failure. + * + * @param[in] pkt Packet on which to operate. + * @return A pointer to the packet's standard metadata. + */ +static __inline netio_pkt_metadata_t* +NETIO_PKT_METADATA(netio_pkt_t* pkt) +{ + netio_assert(!pkt->__packet.bits.__minimal); + return &pkt->__metadata; +} + + +/** Return a pointer to the minimal metadata for a packet. + * @ingroup egress + * + * Calling this function once and passing the result to other retrieval + * functions with a "_MM" suffix usually improves performance. This + * function must be called on an 'egress' packet (i.e. one on which + * @ref netio_populate_buffer() or @ref netio_populate_prepend_buffer() + * have been called, or one retrieved by @ref netio_get_buffer()). Use of + * this function on an 'ingress' packet will cause an assertion failure. + * + * @param[in] pkt Packet on which to operate. + * @return A pointer to the packet's standard metadata. + */ +static __inline netio_pkt_minimal_metadata_t* +NETIO_PKT_MINIMAL_METADATA(netio_pkt_t* pkt) +{ + netio_assert(pkt->__packet.bits.__minimal); + return (netio_pkt_minimal_metadata_t*) &pkt->__metadata; +} + + +/** Determine whether a packet has 'minimal' metadata. + * @ingroup pktfuncs + * + * This function will return nonzero if the packet is an 'egress' + * packet (i.e. one on which @ref netio_populate_buffer() or + * @ref netio_populate_prepend_buffer() have been called, or one + * retrieved by @ref netio_get_buffer()), and zero if the packet + * is an 'ingress' packet (i.e. one retrieved by @ref netio_get_packet(), + * which has not been converted into an 'egress' packet). + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the packet has minimal metadata. + */ +static __inline unsigned int +NETIO_PKT_IS_MINIMAL(netio_pkt_t* pkt) +{ + return pkt->__packet.bits.__minimal; +} + + +/** Return a handle for a packet's storage. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return A handle for the packet's storage. + */ +static __inline netio_pkt_handle_t +NETIO_PKT_HANDLE(netio_pkt_t* pkt) +{ + netio_pkt_handle_t h; + h.word = pkt->__packet.word; + return h; +} + + +/** A special reserved value indicating the absence of a packet handle. + * + * @ingroup pktfuncs + */ +#define NETIO_PKT_HANDLE_NONE ((netio_pkt_handle_t) { 0 }) + + +/** Test whether a packet handle is valid. + * + * Applications may wish to use the reserved value NETIO_PKT_HANDLE_NONE + * to indicate no packet at all. This function tests to see if a packet + * handle is a real handle, not this special reserved value. + * + * @ingroup pktfuncs + * + * @param[in] handle Handle on which to operate. + * @return One if the packet handle is valid, else zero. + */ +static __inline unsigned int +NETIO_PKT_HANDLE_IS_VALID(netio_pkt_handle_t handle) +{ + return handle.word != 0; +} + + + +/** Return a pointer to the start of the packet's custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * @ingroup ingress + * + * @param[in] handle Handle on which to operate. + * @return A pointer to start of the packet. + */ +static __inline unsigned char* +NETIO_PKT_CUSTOM_DATA_H(netio_pkt_handle_t handle) +{ + return _NETIO_PKT_HANDLE_BASE(handle) + NETIO_PACKET_PADDING; +} + + +/** Return the length of the packet's custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The length of the packet's custom header, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_CUSTOM_HEADER_LENGTH_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + /* + * Note that we effectively need to extract a quantity from the flags word + * which is measured in words, and then turn it into bytes by shifting + * it left by 2. We do this all at once by just shifting right two less + * bits, and shifting the mask up two bits. + */ + return ((mda->__flags >> (_NETIO_PKT_CUSTOM_LEN_SHIFT - 2)) & + (_NETIO_PKT_CUSTOM_LEN_RMASK << 2)); +} + + +/** Return the length of the packet, starting with the custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The length of the packet, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_CUSTOM_LENGTH_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (__NETIO_PKT_NOTIF_HEADER(pkt).bits.__transfer_size - + NETIO_PACKET_PADDING); +} + + +/** Return a pointer to the start of the packet's custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return A pointer to start of the packet. + */ +static __inline unsigned char* +NETIO_PKT_CUSTOM_DATA_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return NETIO_PKT_CUSTOM_DATA_H(NETIO_PKT_HANDLE(pkt)); +} + + +/** Return the length of the packet's L2 (Ethernet plus VLAN or SNAP) header. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The length of the packet's L2 header, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L2_HEADER_LENGTH_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + /* + * Note that we effectively need to extract a quantity from the flags word + * which is measured in words, and then turn it into bytes by shifting + * it left by 2. We do this all at once by just shifting right two less + * bits, and shifting the mask up two bits. We then add two bytes. + */ + return ((mda->__flags >> (_NETIO_PKT_L2_LEN_SHIFT - 2)) & + (_NETIO_PKT_L2_LEN_RMASK << 2)) + 2; +} + + +/** Return the length of the packet, starting with the L2 (Ethernet) header. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The length of the packet, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L2_LENGTH_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (NETIO_PKT_CUSTOM_LENGTH_M(mda, pkt) - + NETIO_PKT_CUSTOM_HEADER_LENGTH_M(mda,pkt)); +} + + +/** Return a pointer to the start of the packet's L2 (Ethernet) header. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return A pointer to start of the packet. + */ +static __inline unsigned char* +NETIO_PKT_L2_DATA_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (NETIO_PKT_CUSTOM_DATA_M(mda, pkt) + + NETIO_PKT_CUSTOM_HEADER_LENGTH_M(mda, pkt)); +} + + +/** Retrieve the length of the packet, starting with the L3 (generally, + * the IP) header. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Length of the packet's L3 header and data, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L3_LENGTH_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (NETIO_PKT_L2_LENGTH_M(mda, pkt) - + NETIO_PKT_L2_HEADER_LENGTH_M(mda,pkt)); +} + + +/** Return a pointer to the packet's L3 (generally, the IP) header. + * @ingroup ingress + * + * Note that we guarantee word alignment of the L3 header. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return A pointer to the packet's L3 header. + */ +static __inline unsigned char* +NETIO_PKT_L3_DATA_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (NETIO_PKT_L2_DATA_M(mda, pkt) + + NETIO_PKT_L2_HEADER_LENGTH_M(mda, pkt)); +} + + +/** Return the ordinal of the packet. + * @ingroup ingress + * + * Each packet is given an ordinal number when it is delivered by the IPP. + * In the medium term, the ordinal is unique and monotonically increasing, + * being incremented by 1 for each packet; the ordinal of the first packet + * delivered after the IPP starts is zero. (Since the ordinal is of finite + * size, given enough input packets, it will eventually wrap around to zero; + * in the long term, therefore, ordinals are not unique.) The ordinals + * handed out by different IPPs are not disjoint, so two packets from + * different IPPs may have identical ordinals. Packets dropped by the + * IPP or by the I/O shim are not assigned ordinals. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's per-IPP packet ordinal. + */ +static __inline unsigned int +NETIO_PKT_ORDINAL_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return mda->__packet_ordinal; +} + + +/** Return the per-group ordinal of the packet. + * @ingroup ingress + * + * Each packet is given a per-group ordinal number when it is + * delivered by the IPP. By default, the group is the packet's VLAN, + * although IPP can be recompiled to use different values. In + * the medium term, the ordinal is unique and monotonically + * increasing, being incremented by 1 for each packet; the ordinal of + * the first packet distributed to a particular group is zero. + * (Since the ordinal is of finite size, given enough input packets, + * it will eventually wrap around to zero; in the long term, + * therefore, ordinals are not unique.) The ordinals handed out by + * different IPPs are not disjoint, so two packets from different IPPs + * may have identical ordinals; similarly, packets distributed to + * different groups may have identical ordinals. Packets dropped by + * the IPP or by the I/O shim are not assigned ordinals. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's per-IPP, per-group ordinal. + */ +static __inline unsigned int +NETIO_PKT_GROUP_ORDINAL_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return mda->__group_ordinal; +} + + +/** Return the VLAN ID assigned to the packet. + * @ingroup ingress + * + * This value is usually contained within the packet header. + * + * This value will be zero if the packet does not have a VLAN tag, or if + * this value was not extracted from the packet. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's VLAN ID. + */ +static __inline unsigned short +NETIO_PKT_VLAN_ID_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + int vl = (mda->__flags >> _NETIO_PKT_VLAN_SHIFT) & _NETIO_PKT_VLAN_RMASK; + unsigned short* pkt_p; + int index; + unsigned short val; + + if (vl == _NETIO_PKT_VLAN_NONE) + return 0; + + pkt_p = (unsigned short*) NETIO_PKT_L2_DATA_M(mda, pkt); + index = (mda->__flags >> _NETIO_PKT_TYPE_SHIFT) & _NETIO_PKT_TYPE_RMASK; + + val = pkt_p[(_netio_pkt_info[index] >> _NETIO_PKT_INFO_VLAN_SHIFT) & + _NETIO_PKT_INFO_VLAN_RMASK]; + +#ifdef __TILECC__ + return (__insn_bytex(val) >> 16) & 0xFFF; +#else + return (__builtin_bswap32(val) >> 16) & 0xFFF; +#endif +} + + +/** Return the ethertype of the packet. + * @ingroup ingress + * + * This value is usually contained within the packet header. + * + * This value is reliable if @ref NETIO_PKT_ETHERTYPE_RECOGNIZED_M() + * returns true, and otherwise, may not be well defined. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's ethertype. + */ +static __inline unsigned short +NETIO_PKT_ETHERTYPE_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + unsigned short* pkt_p = (unsigned short*) NETIO_PKT_L2_DATA_M(mda, pkt); + int index = (mda->__flags >> _NETIO_PKT_TYPE_SHIFT) & _NETIO_PKT_TYPE_RMASK; + + unsigned short val = + pkt_p[(_netio_pkt_info[index] >> _NETIO_PKT_INFO_ETYPE_SHIFT) & + _NETIO_PKT_INFO_ETYPE_RMASK]; + + return __builtin_bswap32(val) >> 16; +} + + +/** Return the flow hash computed on the packet. + * @ingroup ingress + * + * For TCP and UDP packets, this hash is calculated by hashing together + * the "5-tuple" values, specifically the source IP address, destination + * IP address, protocol type, source port and destination port. + * The hash value is intended to be helpful for millions of distinct + * flows. + * + * For IPv4 or IPv6 packets which are neither TCP nor UDP, the flow hash is + * derived by hashing together the source and destination IP addresses. + * + * For MPLS-encapsulated packets, the flow hash is derived by hashing + * the first MPLS label. + * + * For all other packets the flow hash is computed from the source + * and destination Ethernet addresses. + * + * The hash is symmetric, meaning it produces the same value if the + * source and destination are swapped. The only exceptions are + * tunneling protocols 0x04 (IP in IP Encapsulation), 0x29 (Simple + * Internet Protocol), 0x2F (General Routing Encapsulation) and 0x32 + * (Encap Security Payload), which use only the destination address + * since the source address is not meaningful. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's 32-bit flow hash. + */ +static __inline unsigned int +NETIO_PKT_FLOW_HASH_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return mda->__flow_hash; +} + + +/** Return the first word of "user data" for the packet. + * + * The contents of the user data words depend on the IPP. + * + * When using the standard ipp1, ipp2, or ipp4 sub-drivers, the first + * word of user data contains the least significant bits of the 64-bit + * arrival cycle count (see @c get_cycle_count_low()). + * + * See the <em>System Programmer's Guide</em> for details. + * + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's first word of "user data". + */ +static __inline unsigned int +NETIO_PKT_USER_DATA_0_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return mda->__user_data_0; +} + + +/** Return the second word of "user data" for the packet. + * + * The contents of the user data words depend on the IPP. + * + * When using the standard ipp1, ipp2, or ipp4 sub-drivers, the second + * word of user data contains the most significant bits of the 64-bit + * arrival cycle count (see @c get_cycle_count_high()). + * + * See the <em>System Programmer's Guide</em> for details. + * + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's second word of "user data". + */ +static __inline unsigned int +NETIO_PKT_USER_DATA_1_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return mda->__user_data_1; +} + + +/** Determine whether the L4 (TCP/UDP) checksum was calculated. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the L4 checksum was calculated. + */ +static __inline unsigned int +NETIO_PKT_L4_CSUM_CALCULATED_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return !(mda->__flags & _NETIO_PKT_NO_L4_CSUM_MASK); +} + + +/** Determine whether the L4 (TCP/UDP) checksum was calculated and found to + * be correct. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the checksum was calculated and is correct. + */ +static __inline unsigned int +NETIO_PKT_L4_CSUM_CORRECT_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return !(mda->__flags & + (_NETIO_PKT_BAD_L4_CSUM_MASK | _NETIO_PKT_NO_L4_CSUM_MASK)); +} + + +/** Determine whether the L3 (IP) checksum was calculated. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the L3 (IP) checksum was calculated. +*/ +static __inline unsigned int +NETIO_PKT_L3_CSUM_CALCULATED_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return !(mda->__flags & _NETIO_PKT_NO_L3_CSUM_MASK); +} + + +/** Determine whether the L3 (IP) checksum was calculated and found to be + * correct. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the checksum was calculated and is correct. + */ +static __inline unsigned int +NETIO_PKT_L3_CSUM_CORRECT_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return !(mda->__flags & + (_NETIO_PKT_BAD_L3_CSUM_MASK | _NETIO_PKT_NO_L3_CSUM_MASK)); +} + + +/** Determine whether the ethertype was recognized and L3 packet data was + * processed. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the ethertype was recognized and L3 packet data was + * processed. + */ +static __inline unsigned int +NETIO_PKT_ETHERTYPE_RECOGNIZED_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return !(mda->__flags & _NETIO_PKT_TYPE_UNRECOGNIZED_MASK); +} + + +/** Retrieve the status of a packet and any errors that may have occurred + * during ingress processing (length mismatches, CRC errors, etc.). + * @ingroup ingress + * + * Note that packets for which @ref NETIO_PKT_ETHERTYPE_RECOGNIZED() + * returns zero are always reported as underlength, as there is no a priori + * means to determine their length. Normally, applications should use + * @ref NETIO_PKT_BAD_M() instead of explicitly checking status with this + * function. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return The packet's status. + */ +static __inline netio_pkt_status_t +NETIO_PKT_STATUS_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (netio_pkt_status_t) __NETIO_PKT_NOTIF_HEADER(pkt).bits.__status; +} + + +/** Report whether a packet is bad (i.e., was shorter than expected based on + * its headers, or had a bad CRC). + * @ingroup ingress + * + * Note that this function does not verify L3 or L4 checksums. + * + * @param[in] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the packet is bad and should be discarded. + */ +static __inline unsigned int +NETIO_PKT_BAD_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return ((NETIO_PKT_STATUS_M(mda, pkt) & 1) && + (NETIO_PKT_ETHERTYPE_RECOGNIZED_M(mda, pkt) || + NETIO_PKT_STATUS_M(mda, pkt) == NETIO_PKT_STATUS_BAD)); +} + + +/** Return the length of the packet, starting with the L2 (Ethernet) header. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @return The length of the packet, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L2_LENGTH_MM(netio_pkt_minimal_metadata_t* mmd, netio_pkt_t* pkt) +{ + return mmd->l2_length; +} + + +/** Return the length of the L2 (Ethernet) header. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @return The length of the packet's L2 header, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L2_HEADER_LENGTH_MM(netio_pkt_minimal_metadata_t* mmd, + netio_pkt_t* pkt) +{ + return mmd->l3_offset - mmd->l2_offset; +} + + +/** Return the length of the packet, starting with the L3 (IP) header. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @return Length of the packet's L3 header and data, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L3_LENGTH_MM(netio_pkt_minimal_metadata_t* mmd, netio_pkt_t* pkt) +{ + return (NETIO_PKT_L2_LENGTH_MM(mmd, pkt) - + NETIO_PKT_L2_HEADER_LENGTH_MM(mmd, pkt)); +} + + +/** Return a pointer to the packet's L3 (generally, the IP) header. + * @ingroup egress + * + * Note that we guarantee word alignment of the L3 header. + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @return A pointer to the packet's L3 header. + */ +static __inline unsigned char* +NETIO_PKT_L3_DATA_MM(netio_pkt_minimal_metadata_t* mmd, netio_pkt_t* pkt) +{ + return _NETIO_PKT_BASE(pkt) + mmd->l3_offset; +} + + +/** Return a pointer to the packet's L2 (Ethernet) header. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @return A pointer to start of the packet. + */ +static __inline unsigned char* +NETIO_PKT_L2_DATA_MM(netio_pkt_minimal_metadata_t* mmd, netio_pkt_t* pkt) +{ + return _NETIO_PKT_BASE(pkt) + mmd->l2_offset; +} + + +/** Retrieve the status of a packet and any errors that may have occurred + * during ingress processing (length mismatches, CRC errors, etc.). + * @ingroup ingress + * + * Note that packets for which @ref NETIO_PKT_ETHERTYPE_RECOGNIZED() + * returns zero are always reported as underlength, as there is no a priori + * means to determine their length. Normally, applications should use + * @ref NETIO_PKT_BAD() instead of explicitly checking status with this + * function. + * + * @param[in] pkt Packet on which to operate. + * @return The packet's status. + */ +static __inline netio_pkt_status_t +NETIO_PKT_STATUS(netio_pkt_t* pkt) +{ + netio_assert(!pkt->__packet.bits.__minimal); + + return (netio_pkt_status_t) __NETIO_PKT_NOTIF_HEADER(pkt).bits.__status; +} + + +/** Report whether a packet is bad (i.e., was shorter than expected based on + * its headers, or had a bad CRC). + * @ingroup ingress + * + * Note that this function does not verify L3 or L4 checksums. + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the packet is bad and should be discarded. + */ +static __inline unsigned int +NETIO_PKT_BAD(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_BAD_M(mda, pkt); +} + + +/** Return the length of the packet's custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return The length of the packet's custom header, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_CUSTOM_HEADER_LENGTH(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_CUSTOM_HEADER_LENGTH_M(mda, pkt); +} + + +/** Return the length of the packet, starting with the custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return The length of the packet, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_CUSTOM_LENGTH(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_CUSTOM_LENGTH_M(mda, pkt); +} + + +/** Return a pointer to the packet's custom header. + * A custom header may or may not be present, depending upon the IPP; its + * contents and alignment are also IPP-dependent. Currently, none of the + * standard IPPs supplied by Tilera produce a custom header. If present, + * the custom header precedes the L2 header in the packet buffer. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return A pointer to start of the packet. + */ +static __inline unsigned char* +NETIO_PKT_CUSTOM_DATA(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_CUSTOM_DATA_M(mda, pkt); +} + + +/** Return the length of the packet's L2 (Ethernet plus VLAN or SNAP) header. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return The length of the packet's L2 header, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L2_HEADER_LENGTH(netio_pkt_t* pkt) +{ + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + return NETIO_PKT_L2_HEADER_LENGTH_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L2_HEADER_LENGTH_M(mda, pkt); + } +} + + +/** Return the length of the packet, starting with the L2 (Ethernet) header. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return The length of the packet, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L2_LENGTH(netio_pkt_t* pkt) +{ + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + return NETIO_PKT_L2_LENGTH_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L2_LENGTH_M(mda, pkt); + } +} + + +/** Return a pointer to the packet's L2 (Ethernet) header. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return A pointer to start of the packet. + */ +static __inline unsigned char* +NETIO_PKT_L2_DATA(netio_pkt_t* pkt) +{ + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + return NETIO_PKT_L2_DATA_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L2_DATA_M(mda, pkt); + } +} + + +/** Retrieve the length of the packet, starting with the L3 (generally, the IP) + * header. + * @ingroup pktfuncs + * + * @param[in] pkt Packet on which to operate. + * @return Length of the packet's L3 header and data, in bytes. + */ +static __inline netio_size_t +NETIO_PKT_L3_LENGTH(netio_pkt_t* pkt) +{ + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + return NETIO_PKT_L3_LENGTH_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L3_LENGTH_M(mda, pkt); + } +} + + +/** Return a pointer to the packet's L3 (generally, the IP) header. + * @ingroup pktfuncs + * + * Note that we guarantee word alignment of the L3 header. + * + * @param[in] pkt Packet on which to operate. + * @return A pointer to the packet's L3 header. + */ +static __inline unsigned char* +NETIO_PKT_L3_DATA(netio_pkt_t* pkt) +{ + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + return NETIO_PKT_L3_DATA_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L3_DATA_M(mda, pkt); + } +} + + +/** Return the ordinal of the packet. + * @ingroup ingress + * + * Each packet is given an ordinal number when it is delivered by the IPP. + * In the medium term, the ordinal is unique and monotonically increasing, + * being incremented by 1 for each packet; the ordinal of the first packet + * delivered after the IPP starts is zero. (Since the ordinal is of finite + * size, given enough input packets, it will eventually wrap around to zero; + * in the long term, therefore, ordinals are not unique.) The ordinals + * handed out by different IPPs are not disjoint, so two packets from + * different IPPs may have identical ordinals. Packets dropped by the + * IPP or by the I/O shim are not assigned ordinals. + * + * + * @param[in] pkt Packet on which to operate. + * @return The packet's per-IPP packet ordinal. + */ +static __inline unsigned int +NETIO_PKT_ORDINAL(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_ORDINAL_M(mda, pkt); +} + + +/** Return the per-group ordinal of the packet. + * @ingroup ingress + * + * Each packet is given a per-group ordinal number when it is + * delivered by the IPP. By default, the group is the packet's VLAN, + * although IPP can be recompiled to use different values. In + * the medium term, the ordinal is unique and monotonically + * increasing, being incremented by 1 for each packet; the ordinal of + * the first packet distributed to a particular group is zero. + * (Since the ordinal is of finite size, given enough input packets, + * it will eventually wrap around to zero; in the long term, + * therefore, ordinals are not unique.) The ordinals handed out by + * different IPPs are not disjoint, so two packets from different IPPs + * may have identical ordinals; similarly, packets distributed to + * different groups may have identical ordinals. Packets dropped by + * the IPP or by the I/O shim are not assigned ordinals. + * + * @param[in] pkt Packet on which to operate. + * @return The packet's per-IPP, per-group ordinal. + */ +static __inline unsigned int +NETIO_PKT_GROUP_ORDINAL(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_GROUP_ORDINAL_M(mda, pkt); +} + + +/** Return the VLAN ID assigned to the packet. + * @ingroup ingress + * + * This is usually also contained within the packet header. If the packet + * does not have a VLAN tag, the VLAN ID returned by this function is zero. + * + * @param[in] pkt Packet on which to operate. + * @return The packet's VLAN ID. + */ +static __inline unsigned short +NETIO_PKT_VLAN_ID(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_VLAN_ID_M(mda, pkt); +} + + +/** Return the ethertype of the packet. + * @ingroup ingress + * + * This value is reliable if @ref NETIO_PKT_ETHERTYPE_RECOGNIZED() + * returns true, and otherwise, may not be well defined. + * + * @param[in] pkt Packet on which to operate. + * @return The packet's ethertype. + */ +static __inline unsigned short +NETIO_PKT_ETHERTYPE(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_ETHERTYPE_M(mda, pkt); +} + + +/** Return the flow hash computed on the packet. + * @ingroup ingress + * + * For TCP and UDP packets, this hash is calculated by hashing together + * the "5-tuple" values, specifically the source IP address, destination + * IP address, protocol type, source port and destination port. + * The hash value is intended to be helpful for millions of distinct + * flows. + * + * For IPv4 or IPv6 packets which are neither TCP nor UDP, the flow hash is + * derived by hashing together the source and destination IP addresses. + * + * For MPLS-encapsulated packets, the flow hash is derived by hashing + * the first MPLS label. + * + * For all other packets the flow hash is computed from the source + * and destination Ethernet addresses. + * + * The hash is symmetric, meaning it produces the same value if the + * source and destination are swapped. The only exceptions are + * tunneling protocols 0x04 (IP in IP Encapsulation), 0x29 (Simple + * Internet Protocol), 0x2F (General Routing Encapsulation) and 0x32 + * (Encap Security Payload), which use only the destination address + * since the source address is not meaningful. + * + * @param[in] pkt Packet on which to operate. + * @return The packet's 32-bit flow hash. + */ +static __inline unsigned int +NETIO_PKT_FLOW_HASH(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_FLOW_HASH_M(mda, pkt); +} + + +/** Return the first word of "user data" for the packet. + * + * The contents of the user data words depend on the IPP. + * + * When using the standard ipp1, ipp2, or ipp4 sub-drivers, the first + * word of user data contains the least significant bits of the 64-bit + * arrival cycle count (see @c get_cycle_count_low()). + * + * See the <em>System Programmer's Guide</em> for details. + * + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return The packet's first word of "user data". + */ +static __inline unsigned int +NETIO_PKT_USER_DATA_0(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_USER_DATA_0_M(mda, pkt); +} + + +/** Return the second word of "user data" for the packet. + * + * The contents of the user data words depend on the IPP. + * + * When using the standard ipp1, ipp2, or ipp4 sub-drivers, the second + * word of user data contains the most significant bits of the 64-bit + * arrival cycle count (see @c get_cycle_count_high()). + * + * See the <em>System Programmer's Guide</em> for details. + * + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return The packet's second word of "user data". + */ +static __inline unsigned int +NETIO_PKT_USER_DATA_1(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_USER_DATA_1_M(mda, pkt); +} + + +/** Determine whether the L4 (TCP/UDP) checksum was calculated. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the L4 checksum was calculated. + */ +static __inline unsigned int +NETIO_PKT_L4_CSUM_CALCULATED(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L4_CSUM_CALCULATED_M(mda, pkt); +} + + +/** Determine whether the L4 (TCP/UDP) checksum was calculated and found to + * be correct. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the checksum was calculated and is correct. + */ +static __inline unsigned int +NETIO_PKT_L4_CSUM_CORRECT(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L4_CSUM_CORRECT_M(mda, pkt); +} + + +/** Determine whether the L3 (IP) checksum was calculated. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the L3 (IP) checksum was calculated. +*/ +static __inline unsigned int +NETIO_PKT_L3_CSUM_CALCULATED(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L3_CSUM_CALCULATED_M(mda, pkt); +} + + +/** Determine whether the L3 (IP) checksum was calculated and found to be + * correct. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the checksum was calculated and is correct. + */ +static __inline unsigned int +NETIO_PKT_L3_CSUM_CORRECT(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_L3_CSUM_CORRECT_M(mda, pkt); +} + + +/** Determine whether the Ethertype was recognized and L3 packet data was + * processed. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + * @return Nonzero if the Ethertype was recognized and L3 packet data was + * processed. + */ +static __inline unsigned int +NETIO_PKT_ETHERTYPE_RECOGNIZED(netio_pkt_t* pkt) +{ + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_ETHERTYPE_RECOGNIZED_M(mda, pkt); +} + + +/** Set an egress packet's L2 length, using a metadata pointer to speed the + * computation. + * @ingroup egress + * + * @param[in,out] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @param[in] len Packet L2 length, in bytes. + */ +static __inline void +NETIO_PKT_SET_L2_LENGTH_MM(netio_pkt_minimal_metadata_t* mmd, netio_pkt_t* pkt, + int len) +{ + mmd->l2_length = len; +} + + +/** Set an egress packet's L2 length. + * @ingroup egress + * + * @param[in,out] pkt Packet on which to operate. + * @param[in] len Packet L2 length, in bytes. + */ +static __inline void +NETIO_PKT_SET_L2_LENGTH(netio_pkt_t* pkt, int len) +{ + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + NETIO_PKT_SET_L2_LENGTH_MM(mmd, pkt, len); +} + + +/** Set an egress packet's L2 header length, using a metadata pointer to + * speed the computation. + * @ingroup egress + * + * It is not normally necessary to call this routine; only the L2 length, + * not the header length, is needed to transmit a packet. It may be useful if + * the egress packet will later be processed by code which expects to use + * functions like @ref NETIO_PKT_L3_DATA() to get a pointer to the L3 payload. + * + * @param[in,out] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @param[in] len Packet L2 header length, in bytes. + */ +static __inline void +NETIO_PKT_SET_L2_HEADER_LENGTH_MM(netio_pkt_minimal_metadata_t* mmd, + netio_pkt_t* pkt, int len) +{ + mmd->l3_offset = mmd->l2_offset + len; +} + + +/** Set an egress packet's L2 header length. + * @ingroup egress + * + * It is not normally necessary to call this routine; only the L2 length, + * not the header length, is needed to transmit a packet. It may be useful if + * the egress packet will later be processed by code which expects to use + * functions like @ref NETIO_PKT_L3_DATA() to get a pointer to the L3 payload. + * + * @param[in,out] pkt Packet on which to operate. + * @param[in] len Packet L2 header length, in bytes. + */ +static __inline void +NETIO_PKT_SET_L2_HEADER_LENGTH(netio_pkt_t* pkt, int len) +{ + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + NETIO_PKT_SET_L2_HEADER_LENGTH_MM(mmd, pkt, len); +} + + +/** Set up an egress packet for hardware checksum computation, using a + * metadata pointer to speed the operation. + * @ingroup egress + * + * NetIO provides the ability to automatically calculate a standard + * 16-bit Internet checksum on transmitted packets. The application + * may specify the point in the packet where the checksum starts, the + * number of bytes to be checksummed, and the two bytes in the packet + * which will be replaced with the completed checksum. (If the range + * of bytes to be checksummed includes the bytes to be replaced, the + * initial values of those bytes will be included in the checksum.) + * + * For some protocols, the packet checksum covers data which is not present + * in the packet, or is at least not contiguous to the main data payload. + * For instance, the TCP checksum includes a "pseudo-header" which includes + * the source and destination IP addresses of the packet. To accommodate + * this, the checksum engine may be "seeded" with an initial value, which + * the application would need to compute based on the specific protocol's + * requirements. Note that the seed is given in host byte order (little- + * endian), not network byte order (big-endian); code written to compute a + * pseudo-header checksum in network byte order will need to byte-swap it + * before use as the seed. + * + * Note that the checksum is computed as part of the transmission process, + * so it will not be present in the packet upon completion of this routine. + * + * @param[in,out] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + * @param[in] start Offset within L2 packet of the first byte to include in + * the checksum. + * @param[in] length Number of bytes to include in the checksum. + * the checksum. + * @param[in] location Offset within L2 packet of the first of the two bytes + * to be replaced with the calculated checksum. + * @param[in] seed Initial value of the running checksum before any of the + * packet data is added. + */ +static __inline void +NETIO_PKT_DO_EGRESS_CSUM_MM(netio_pkt_minimal_metadata_t* mmd, + netio_pkt_t* pkt, int start, int length, + int location, uint16_t seed) +{ + mmd->csum_start = start; + mmd->csum_length = length; + mmd->csum_location = location; + mmd->csum_seed = seed; + mmd->flags |= _NETIO_PKT_NEED_EDMA_CSUM_MASK; +} + + +/** Set up an egress packet for hardware checksum computation. + * @ingroup egress + * + * NetIO provides the ability to automatically calculate a standard + * 16-bit Internet checksum on transmitted packets. The application + * may specify the point in the packet where the checksum starts, the + * number of bytes to be checksummed, and the two bytes in the packet + * which will be replaced with the completed checksum. (If the range + * of bytes to be checksummed includes the bytes to be replaced, the + * initial values of those bytes will be included in the checksum.) + * + * For some protocols, the packet checksum covers data which is not present + * in the packet, or is at least not contiguous to the main data payload. + * For instance, the TCP checksum includes a "pseudo-header" which includes + * the source and destination IP addresses of the packet. To accommodate + * this, the checksum engine may be "seeded" with an initial value, which + * the application would need to compute based on the specific protocol's + * requirements. Note that the seed is given in host byte order (little- + * endian), not network byte order (big-endian); code written to compute a + * pseudo-header checksum in network byte order will need to byte-swap it + * before use as the seed. + * + * Note that the checksum is computed as part of the transmission process, + * so it will not be present in the packet upon completion of this routine. + * + * @param[in,out] pkt Packet on which to operate. + * @param[in] start Offset within L2 packet of the first byte to include in + * the checksum. + * @param[in] length Number of bytes to include in the checksum. + * the checksum. + * @param[in] location Offset within L2 packet of the first of the two bytes + * to be replaced with the calculated checksum. + * @param[in] seed Initial value of the running checksum before any of the + * packet data is added. + */ +static __inline void +NETIO_PKT_DO_EGRESS_CSUM(netio_pkt_t* pkt, int start, int length, + int location, uint16_t seed) +{ + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + NETIO_PKT_DO_EGRESS_CSUM_MM(mmd, pkt, start, length, location, seed); +} + + +/** Return the number of bytes which could be prepended to a packet, using a + * metadata pointer to speed the operation. + * See @ref netio_populate_prepend_buffer() to get a full description of + * prepending. + * + * @param[in,out] mda Pointer to packet's standard metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline int +NETIO_PKT_PREPEND_AVAIL_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ + return (pkt->__packet.bits.__offset << 6) + + NETIO_PKT_CUSTOM_HEADER_LENGTH_M(mda, pkt); +} + + +/** Return the number of bytes which could be prepended to a packet, using a + * metadata pointer to speed the operation. + * See @ref netio_populate_prepend_buffer() to get a full description of + * prepending. + * @ingroup egress + * + * @param[in,out] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline int +NETIO_PKT_PREPEND_AVAIL_MM(netio_pkt_minimal_metadata_t* mmd, netio_pkt_t* pkt) +{ + return (pkt->__packet.bits.__offset << 6) + mmd->l2_offset; +} + + +/** Return the number of bytes which could be prepended to a packet. + * See @ref netio_populate_prepend_buffer() to get a full description of + * prepending. + * @ingroup egress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline int +NETIO_PKT_PREPEND_AVAIL(netio_pkt_t* pkt) +{ + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = NETIO_PKT_MINIMAL_METADATA(pkt); + + return NETIO_PKT_PREPEND_AVAIL_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = NETIO_PKT_METADATA(pkt); + + return NETIO_PKT_PREPEND_AVAIL_M(mda, pkt); + } +} + + +/** Flush a packet's minimal metadata from the cache, using a metadata pointer + * to speed the operation. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_MINIMAL_METADATA_MM(netio_pkt_minimal_metadata_t* mmd, + netio_pkt_t* pkt) +{ +} + + +/** Invalidate a packet's minimal metadata from the cache, using a metadata + * pointer to speed the operation. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_INV_MINIMAL_METADATA_MM(netio_pkt_minimal_metadata_t* mmd, + netio_pkt_t* pkt) +{ +} + + +/** Flush and then invalidate a packet's minimal metadata from the cache, + * using a metadata pointer to speed the operation. + * @ingroup egress + * + * @param[in] mmd Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_INV_MINIMAL_METADATA_MM(netio_pkt_minimal_metadata_t* mmd, + netio_pkt_t* pkt) +{ +} + + +/** Flush a packet's metadata from the cache, using a metadata pointer + * to speed the operation. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's minimal metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_METADATA_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ +} + + +/** Invalidate a packet's metadata from the cache, using a metadata + * pointer to speed the operation. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_INV_METADATA_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ +} + + +/** Flush and then invalidate a packet's metadata from the cache, + * using a metadata pointer to speed the operation. + * @ingroup ingress + * + * @param[in] mda Pointer to packet's metadata. + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_INV_METADATA_M(netio_pkt_metadata_t* mda, netio_pkt_t* pkt) +{ +} + + +/** Flush a packet's minimal metadata from the cache. + * @ingroup egress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_MINIMAL_METADATA(netio_pkt_t* pkt) +{ +} + + +/** Invalidate a packet's minimal metadata from the cache. + * @ingroup egress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_INV_MINIMAL_METADATA(netio_pkt_t* pkt) +{ +} + + +/** Flush and then invalidate a packet's minimal metadata from the cache. + * @ingroup egress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_INV_MINIMAL_METADATA(netio_pkt_t* pkt) +{ +} + + +/** Flush a packet's metadata from the cache. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_METADATA(netio_pkt_t* pkt) +{ +} + + +/** Invalidate a packet's metadata from the cache. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_INV_METADATA(netio_pkt_t* pkt) +{ +} + + +/** Flush and then invalidate a packet's metadata from the cache. + * @ingroup ingress + * + * @param[in] pkt Packet on which to operate. + */ +static __inline void +NETIO_PKT_FLUSH_INV_METADATA(netio_pkt_t* pkt) +{ +} + +/** Number of NUMA nodes we can distribute buffers to. + * @ingroup setup */ +#define NETIO_NUM_NODE_WEIGHTS 16 + +/** + * @brief An object for specifying the characteristics of NetIO communication + * endpoint. + * + * @ingroup setup + * + * The @ref netio_input_register() function uses this structure to define + * how an application tile will communicate with an IPP. + * + * + * Future updates to NetIO may add new members to this structure, + * which can affect the success of the registration operation. Thus, + * if dynamically initializing the structure, applications are urged to + * zero it out first, for example: + * + * @code + * netio_input_config_t config; + * memset(&config, 0, sizeof (config)); + * config.flags = NETIO_RECV | NETIO_XMIT_CSUM | NETIO_TAG_NONE; + * config.num_receive_packets = NETIO_MAX_RECEIVE_PKTS; + * config.queue_id = 0; + * . + * . + * . + * @endcode + * + * since that guarantees that any unused structure members, including + * members which did not exist when the application was first developed, + * will not have unexpected values. + * + * If statically initializing the structure, we strongly recommend use of + * C99-style named initializers, for example: + * + * @code + * netio_input_config_t config = { + * .flags = NETIO_RECV | NETIO_XMIT_CSUM | NETIO_TAG_NONE, + * .num_receive_packets = NETIO_MAX_RECEIVE_PKTS, + * .queue_id = 0, + * }, + * @endcode + * + * instead of the old-style structure initialization: + * + * @code + * // Bad example! Currently equivalent to the above, but don't do this. + * netio_input_config_t config = { + * NETIO_RECV | NETIO_XMIT_CSUM | NETIO_TAG_NONE, NETIO_MAX_RECEIVE_PKTS, 0 + * }, + * @endcode + * + * since the C99 style requires no changes to the code if elements of the + * config structure are rearranged. (It also makes the initialization much + * easier to understand.) + * + * Except for items which address a particular tile's transmit or receive + * characteristics, such as the ::NETIO_RECV flag, applications are advised + * to specify the same set of configuration data on all registrations. + * This prevents differing results if multiple tiles happen to do their + * registration operations in a different order on different invocations of + * the application. This is particularly important for things like link + * management flags, and buffer size and homing specifications. + * + * Unless the ::NETIO_FIXED_BUFFER_VA flag is specified in flags, the NetIO + * buffer pool is automatically created and mapped into the application's + * virtual address space at an address chosen by the operating system, + * using the common memory (cmem) facility in the Tilera Multicore + * Components library. The cmem facility allows multiple processes to gain + * access to shared memory which is mapped into each process at an + * identical virtual address. In order for this to work, the processes + * must have a common ancestor, which must create the common memory using + * tmc_cmem_init(). + * + * In programs using the iLib process creation API, or in programs which use + * only one process (which include programs using the pthreads library), + * tmc_cmem_init() is called automatically. All other applications + * must call it explicitly, before any child processes which might call + * netio_input_register() are created. + */ +typedef struct +{ + /** Registration characteristics. + + This value determines several characteristics of the registration; + flags for different types of behavior are ORed together to make the + final flag value. Generally applications should specify exactly + one flag from each of the following categories: + + - Whether the application will be receiving packets on this queue + (::NETIO_RECV or ::NETIO_NO_RECV). + + - Whether the application will be transmitting packets on this queue, + and if so, whether it will request egress checksum calculation + (::NETIO_XMIT, ::NETIO_XMIT_CSUM, or ::NETIO_NO_XMIT). It is + legal to call netio_get_buffer() without one of the XMIT flags, + as long as ::NETIO_RECV is specified; in this case, the retrieved + buffers must be passed to another tile for transmission. + + - Whether the application expects any vendor-specific tags in + its packets' L2 headers (::NETIO_TAG_NONE, ::NETIO_TAG_BRCM, + or ::NETIO_TAG_MRVL). This must match the configuration of the + target IPP. + + To accommodate applications written to previous versions of the NetIO + interface, none of the flags above are currently required; if omitted, + NetIO behaves more or less as if ::NETIO_RECV | ::NETIO_XMIT_CSUM | + ::NETIO_TAG_NONE were used. However, explicit specification of + the relevant flags allows NetIO to do a better job of resource + allocation, allows earlier detection of certain configuration errors, + and may enable advanced features or higher performance in the future, + so their use is strongly recommended. + + Note that specifying ::NETIO_NO_RECV along with ::NETIO_NO_XMIT + is a special case, intended primarily for use by programs which + retrieve network statistics or do link management operations. + When these flags are both specified, the resulting queue may not + be used with NetIO routines other than netio_get(), netio_set(), + and netio_input_unregister(). See @ref link for more information + on link management. + + Other flags are optional; their use is described below. + */ + int flags; + + /** Interface name. This is a string which identifies the specific + Ethernet controller hardware to be used. The format of the string + is a device type and a device index, separated by a slash; so, + the first 10 Gigabit Ethernet controller is named "xgbe/0", while + the second 10/100/1000 Megabit Ethernet controller is named "gbe/1". + */ + const char* interface; + + /** Receive packet queue size. This specifies the maximum number + of ingress packets that can be received on this queue without + being retrieved by @ref netio_get_packet(). If the IPP's distribution + algorithm calls for a packet to be sent to this queue, and this + number of packets are already pending there, the new packet + will either be discarded, or sent to another tile registered + for the same queue_id (see @ref drops). This value must + be at least ::NETIO_MIN_RECEIVE_PKTS, can always be at least + ::NETIO_MAX_RECEIVE_PKTS, and may be larger than that on certain + interfaces. + */ + int num_receive_packets; + + /** The queue ID being requested. Legal values for this range from 0 + to ::NETIO_MAX_QUEUE_ID, inclusive. ::NETIO_MAX_QUEUE_ID is always + greater than or equal to the number of tiles; this allows one queue + for each tile, plus at least one additional queue. Some applications + may wish to use the additional queue as a destination for unwanted + packets, since packets delivered to queues for which no tiles have + registered are discarded. + */ + unsigned int queue_id; + + /** Maximum number of small send buffers to be held in the local empty + buffer cache. This specifies the size of the area which holds + empty small egress buffers requested from the IPP but not yet + retrieved via @ref netio_get_buffer(). This value must be greater + than zero if the application will ever use @ref netio_get_buffer() + to allocate empty small egress buffers; it may be no larger than + ::NETIO_MAX_SEND_BUFFERS. See @ref epp for more details on empty + buffer caching. + */ + int num_send_buffers_small_total; + + /** Number of small send buffers to be preallocated at registration. + If this value is nonzero, the specified number of empty small egress + buffers will be requested from the IPP during the netio_input_register + operation; this may speed the execution of @ref netio_get_buffer(). + This may be no larger than @ref num_send_buffers_small_total. See @ref + epp for more details on empty buffer caching. + */ + int num_send_buffers_small_prealloc; + + /** Maximum number of large send buffers to be held in the local empty + buffer cache. This specifies the size of the area which holds empty + large egress buffers requested from the IPP but not yet retrieved via + @ref netio_get_buffer(). This value must be greater than zero if the + application will ever use @ref netio_get_buffer() to allocate empty + large egress buffers; it may be no larger than ::NETIO_MAX_SEND_BUFFERS. + See @ref epp for more details on empty buffer caching. + */ + int num_send_buffers_large_total; + + /** Number of large send buffers to be preallocated at registration. + If this value is nonzero, the specified number of empty large egress + buffers will be requested from the IPP during the netio_input_register + operation; this may speed the execution of @ref netio_get_buffer(). + This may be no larger than @ref num_send_buffers_large_total. See @ref + epp for more details on empty buffer caching. + */ + int num_send_buffers_large_prealloc; + + /** Maximum number of jumbo send buffers to be held in the local empty + buffer cache. This specifies the size of the area which holds empty + jumbo egress buffers requested from the IPP but not yet retrieved via + @ref netio_get_buffer(). This value must be greater than zero if the + application will ever use @ref netio_get_buffer() to allocate empty + jumbo egress buffers; it may be no larger than ::NETIO_MAX_SEND_BUFFERS. + See @ref epp for more details on empty buffer caching. + */ + int num_send_buffers_jumbo_total; + + /** Number of jumbo send buffers to be preallocated at registration. + If this value is nonzero, the specified number of empty jumbo egress + buffers will be requested from the IPP during the netio_input_register + operation; this may speed the execution of @ref netio_get_buffer(). + This may be no larger than @ref num_send_buffers_jumbo_total. See @ref + epp for more details on empty buffer caching. + */ + int num_send_buffers_jumbo_prealloc; + + /** Total packet buffer size. This determines the total size, in bytes, + of the NetIO buffer pool. Note that the maximum number of available + buffers of each size is determined during hypervisor configuration + (see the <em>System Programmer's Guide</em> for details); this just + influences how much host memory is allocated for those buffers. + + The buffer pool is allocated from common memory, which will be + automatically initialized if needed. If your buffer pool is larger + than 240 MB, you might need to explicitly call @c tmc_cmem_init(), + as described in the Application Libraries Reference Manual (UG227). + + Packet buffers are currently allocated in chunks of 16 MB; this + value will be rounded up to the next larger multiple of 16 MB. + If this value is zero, a default of 32 MB will be used; this was + the value used by previous versions of NetIO. Note that taking this + default also affects the placement of buffers on Linux NUMA nodes. + See @ref buffer_node_weights for an explanation of buffer placement. + + In order to successfully allocate packet buffers, Linux must have + available huge pages on the relevant Linux NUMA nodes. See the + <em>System Programmer's Guide</em> for information on configuring + huge page support in Linux. + */ + uint64_t total_buffer_size; + + /** Buffer placement weighting factors. + + This array specifies the relative amount of buffering to place + on each of the available Linux NUMA nodes. This array is + indexed by the NUMA node, and the values in the array are + proportional to the amount of buffer space to allocate on that + node. + + If memory striping is enabled in the Hypervisor, then there is + only one logical NUMA node (node 0). In that case, NetIO will by + default ignore the suggested buffer node weights, and buffers + will be striped across the physical memory controllers. See + UG209 System Programmer's Guide for a description of the + hypervisor option that controls memory striping. + + If memory striping is disabled, then there are up to four NUMA + nodes, corresponding to the four DDRAM controllers in the TILE + processor architecture. See UG100 Tile Processor Architecture + Overview for a diagram showing the location of each of the DDRAM + controllers relative to the tile array. + + For instance, if memory striping is disabled, the following + configuration strucure: + + @code + netio_input_config_t config = { + . + . + . + .total_buffer_size = 4 * 16 * 1024 * 1024; + .buffer_node_weights = { 1, 0, 1, 0 }, + }, + @endcode + + would result in 32 MB of buffers being placed on controller 0, and + 32 MB on controller 2. (Since buffers are allocated in units of + 16 MB, some sets of weights will not be able to be matched exactly.) + + For the weights to be effective, @ref total_buffer_size must be + nonzero. If @ref total_buffer_size is zero, causing the default + 32 MB of buffer space to be used, then any specified weights will + be ignored, and buffers will positioned as they were in previous + versions of NetIO: + + - For xgbe/0 and gbe/0, 16 MB of buffers will be placed on controller 1, + and the other 16 MB will be placed on controller 2. + + - For xgbe/1 and gbe/1, 16 MB of buffers will be placed on controller 2, + and the other 16 MB will be placed on controller 3. + + If @ref total_buffer_size is nonzero, but all weights are zero, + then all buffer space will be allocated on Linux NUMA node zero. + + By default, the specified buffer placement is treated as a hint; + if sufficient free memory is not available on the specified + controllers, the buffers will be allocated elsewhere. However, + if the ::NETIO_STRICT_HOMING flag is specified in @ref flags, then a + failure to allocate buffer space exactly as requested will cause the + registration operation to fail with an error of ::NETIO_CANNOT_HOME. + + Note that maximal network performance cannot be achieved with + only one memory controller. + */ + uint8_t buffer_node_weights[NETIO_NUM_NODE_WEIGHTS]; + + /** Fixed virtual address for packet buffers. Only valid when + ::NETIO_FIXED_BUFFER_VA is specified in @ref flags; see the + description of that flag for details. + */ + void* fixed_buffer_va; + + /** + Maximum number of outstanding send packet requests. This value is + only relevant when an EPP is in use; it determines the number of + slots in the EPP's outgoing packet queue which this tile is allowed + to consume, and thus the number of packets which may be sent before + the sending tile must wait for an acknowledgment from the EPP. + Modifying this value is generally only helpful when using @ref + netio_send_packet_vector(), where it can help improve performance by + allowing a single vector send operation to process more packets. + Typically it is not specified, and the default, which divides the + outgoing packet slots evenly between all tiles on the chip, is used. + + If a registration asks for more outgoing packet queue slots than are + available, ::NETIO_TOOMANY_XMIT will be returned. The total number + of packet queue slots which are available for all tiles for each EPP + is subject to change, but is currently ::NETIO_TOTAL_SENDS_OUTSTANDING. + + + This value is ignored if ::NETIO_XMIT is not specified in flags. + If you want to specify a large value here for a specific tile, you are + advised to specify NETIO_NO_XMIT on other, non-transmitting tiles so + that they do not consume a default number of packet slots. Any tile + transmitting is required to have at least ::NETIO_MIN_SENDS_OUTSTANDING + slots allocated to it; values less than that will be silently + increased by the NetIO library. + */ + int num_sends_outstanding; +} +netio_input_config_t; + + +/** Registration flags; used in the @ref netio_input_config_t structure. + * @addtogroup setup + */ +/** @{ */ + +/** Fail a registration request if we can't put packet buffers + on the specified memory controllers. */ +#define NETIO_STRICT_HOMING 0x00000002 + +/** This application expects no tags on its L2 headers. */ +#define NETIO_TAG_NONE 0x00000004 + +/** This application expects Marvell extended tags on its L2 headers. */ +#define NETIO_TAG_MRVL 0x00000008 + +/** This application expects Broadcom tags on its L2 headers. */ +#define NETIO_TAG_BRCM 0x00000010 + +/** This registration may call routines which receive packets. */ +#define NETIO_RECV 0x00000020 + +/** This registration may not call routines which receive packets. */ +#define NETIO_NO_RECV 0x00000040 + +/** This registration may call routines which transmit packets. */ +#define NETIO_XMIT 0x00000080 + +/** This registration may call routines which transmit packets with + checksum acceleration. */ +#define NETIO_XMIT_CSUM 0x00000100 + +/** This registration may not call routines which transmit packets. */ +#define NETIO_NO_XMIT 0x00000200 + +/** This registration wants NetIO buffers mapped at an application-specified + virtual address. + + NetIO buffers are by default created by the TMC common memory facility, + which must be configured by a common ancestor of all processes sharing + a network interface. When this flag is specified, NetIO buffers are + instead mapped at an address chosen by the application (and specified + in @ref netio_input_config_t::fixed_buffer_va). This allows multiple + unrelated but cooperating processes to share a NetIO interface. + All processes sharing the same interface must specify this flag, + and all must specify the same fixed virtual address. + + @ref netio_input_config_t::fixed_buffer_va must be a + multiple of 16 MB, and the packet buffers will occupy @ref + netio_input_config_t::total_buffer_size bytes of virtual address + space, beginning at that address. If any of those virtual addresses + are currently occupied by other memory objects, like application or + shared library code or data, @ref netio_input_register() will return + ::NETIO_FAULT. While it is impossible to provide a fixed_buffer_va + which will work for all applications, a good first guess might be to + use 0xb0000000 minus @ref netio_input_config_t::total_buffer_size. + If that fails, it might be helpful to consult the running application's + virtual address description file (/proc/<em>pid</em>/maps) to see + which regions of virtual address space are available. + */ +#define NETIO_FIXED_BUFFER_VA 0x00000400 + +/** This registration call will not complete unless the network link + is up. The process will wait several seconds for this to happen (the + precise interval is link-dependent), but if the link does not come up, + ::NETIO_LINK_DOWN will be returned. This flag is the default if + ::NETIO_NOREQUIRE_LINK_UP is not specified. Note that this flag by + itself does not request that the link be brought up; that can be done + with the ::NETIO_AUTO_LINK_UPDN or ::NETIO_AUTO_LINK_UP flags (the + latter is the default if no NETIO_AUTO_LINK_xxx flags are specified), + or by explicitly setting the link's desired state via netio_set(). + If the link is not brought up by one of those methods, and this flag + is specified, the registration operation will return ::NETIO_LINK_DOWN. + This flag is ignored if it is specified along with ::NETIO_NO_XMIT and + ::NETIO_NO_RECV. See @ref link for more information on link + management. + */ +#define NETIO_REQUIRE_LINK_UP 0x00000800 + +/** This registration call will complete even if the network link is not up. + Whenever the link is not up, packets will not be sent or received: + netio_get_packet() will return ::NETIO_NOPKT once all queued packets + have been drained, and netio_send_packet() and similar routines will + return NETIO_QUEUE_FULL once the outgoing packet queue in the EPP + or the I/O shim is full. See @ref link for more information on link + management. + */ +#define NETIO_NOREQUIRE_LINK_UP 0x00001000 + +#ifndef __DOXYGEN__ +/* + * These are part of the implementation of the NETIO_AUTO_LINK_xxx flags, + * but should not be used directly by applications, and are thus not + * documented. + */ +#define _NETIO_AUTO_UP 0x00002000 +#define _NETIO_AUTO_DN 0x00004000 +#define _NETIO_AUTO_PRESENT 0x00008000 +#endif + +/** Set the desired state of the link to up, allowing any speeds which are + supported by the link hardware, as part of this registration operation. + Do not take down the link automatically. This is the default if + no other NETIO_AUTO_LINK_xxx flags are specified. This flag is ignored + if it is specified along with ::NETIO_NO_XMIT and ::NETIO_NO_RECV. + See @ref link for more information on link management. + */ +#define NETIO_AUTO_LINK_UP (_NETIO_AUTO_PRESENT | _NETIO_AUTO_UP) + +/** Set the desired state of the link to up, allowing any speeds which are + supported by the link hardware, as part of this registration operation. + Set the desired state of the link to down the next time no tiles are + registered for packet reception or transmission. This flag is ignored + if it is specified along with ::NETIO_NO_XMIT and ::NETIO_NO_RECV. + See @ref link for more information on link management. + */ +#define NETIO_AUTO_LINK_UPDN (_NETIO_AUTO_PRESENT | _NETIO_AUTO_UP | \ + _NETIO_AUTO_DN) + +/** Set the desired state of the link to down the next time no tiles are + registered for packet reception or transmission. This flag is ignored + if it is specified along with ::NETIO_NO_XMIT and ::NETIO_NO_RECV. + See @ref link for more information on link management. + */ +#define NETIO_AUTO_LINK_DN (_NETIO_AUTO_PRESENT | _NETIO_AUTO_DN) + +/** Do not bring up the link automatically as part of this registration + operation. Do not take down the link automatically. This flag + is ignored if it is specified along with ::NETIO_NO_XMIT and + ::NETIO_NO_RECV. See @ref link for more information on link management. + */ +#define NETIO_AUTO_LINK_NONE _NETIO_AUTO_PRESENT + + +/** Minimum number of receive packets. */ +#define NETIO_MIN_RECEIVE_PKTS 16 + +/** Lower bound on the maximum number of receive packets; may be higher + than this on some interfaces. */ +#define NETIO_MAX_RECEIVE_PKTS 128 + +/** Maximum number of send buffers, per packet size. */ +#define NETIO_MAX_SEND_BUFFERS 16 + +/** Number of EPP queue slots, and thus outstanding sends, per EPP. */ +#define NETIO_TOTAL_SENDS_OUTSTANDING 2015 + +/** Minimum number of EPP queue slots, and thus outstanding sends, per + * transmitting tile. */ +#define NETIO_MIN_SENDS_OUTSTANDING 16 + + +/**@}*/ + +#ifndef __DOXYGEN__ + +/** + * An object for providing Ethernet packets to a process. + */ +struct __netio_queue_impl_t; + +/** + * An object for managing the user end of a NetIO queue. + */ +struct __netio_queue_user_impl_t; + +#endif /* !__DOXYGEN__ */ + + +/** A netio_queue_t describes a NetIO communications endpoint. + * @ingroup setup + */ +typedef struct +{ +#ifdef __DOXYGEN__ + uint8_t opaque[8]; /**< This is an opaque structure. */ +#else + struct __netio_queue_impl_t* __system_part; /**< The system part. */ + struct __netio_queue_user_impl_t* __user_part; /**< The user part. */ +#ifdef _NETIO_PTHREAD + _netio_percpu_mutex_t lock; /**< Queue lock. */ +#endif +#endif +} +netio_queue_t; + + +/** + * @brief Packet send context. + * + * @ingroup egress + * + * Packet send context for use with netio_send_packet_prepare and _commit. + */ +typedef struct +{ +#ifdef __DOXYGEN__ + uint8_t opaque[44]; /**< This is an opaque structure. */ +#else + uint8_t flags; /**< Defined below */ + uint8_t datalen; /**< Number of valid words pointed to by data. */ + uint32_t request[9]; /**< Request to be sent to the EPP or shim. Note + that this is smaller than the 11-word maximum + request size, since some constant values are + not saved in the context. */ + uint32_t *data; /**< Data to be sent to the EPP or shim via IDN. */ +#endif +} +netio_send_pkt_context_t; + + +#ifndef __DOXYGEN__ +#define SEND_PKT_CTX_USE_EPP 1 /**< We're sending to an EPP. */ +#define SEND_PKT_CTX_SEND_CSUM 2 /**< Request includes a checksum. */ +#endif + +/** + * @brief Packet vector entry. + * + * @ingroup egress + * + * This data structure is used with netio_send_packet_vector() to send multiple + * packets with one NetIO call. The structure should be initialized by + * calling netio_pkt_vector_set(), rather than by setting the fields + * directly. + * + * This structure is guaranteed to be a power of two in size, no + * bigger than one L2 cache line, and to be aligned modulo its size. + */ +typedef struct +#ifndef __DOXYGEN__ +__attribute__((aligned(8))) +#endif +{ + /** Reserved for use by the user application. When initialized with + * the netio_set_pkt_vector_entry() function, this field is guaranteed + * to be visible to readers only after all other fields are already + * visible. This way it can be used as a valid flag or generation + * counter. */ + uint8_t user_data; + + /* Structure members below this point should not be accessed directly by + * applications, as they may change in the future. */ + + /** Low 8 bits of the packet address to send. The high bits are + * acquired from the 'handle' field. */ + uint8_t buffer_address_low; + + /** Number of bytes to transmit. */ + uint16_t size; + + /** The raw handle from a netio_pkt_t. If this is NETIO_PKT_HANDLE_NONE, + * this vector entry will be skipped and no packet will be transmitted. */ + netio_pkt_handle_t handle; +} +netio_pkt_vector_entry_t; + + +/** + * @brief Initialize fields in a packet vector entry. + * + * @ingroup egress + * + * @param[out] v Pointer to the vector entry to be initialized. + * @param[in] pkt Packet to be transmitted when the vector entry is passed to + * netio_send_packet_vector(). Note that the packet's attributes + * (e.g., its L2 offset and length) are captured at the time this + * routine is called; subsequent changes in those attributes will not + * be reflected in the packet which is actually transmitted. + * Changes in the packet's contents, however, will be so reflected. + * If this is NULL, no packet will be transmitted. + * @param[in] user_data User data to be set in the vector entry. + * This function guarantees that the "user_data" field will become + * visible to a reader only after all other fields have become visible. + * This allows a structure in a ring buffer to be written and read + * by a polling reader without any locks or other synchronization. + */ +static __inline void +netio_pkt_vector_set(volatile netio_pkt_vector_entry_t* v, netio_pkt_t* pkt, + uint8_t user_data) +{ + if (pkt) + { + if (NETIO_PKT_IS_MINIMAL(pkt)) + { + netio_pkt_minimal_metadata_t* mmd = + (netio_pkt_minimal_metadata_t*) &pkt->__metadata; + v->buffer_address_low = (uintptr_t) NETIO_PKT_L2_DATA_MM(mmd, pkt) & 0xFF; + v->size = NETIO_PKT_L2_LENGTH_MM(mmd, pkt); + } + else + { + netio_pkt_metadata_t* mda = &pkt->__metadata; + v->buffer_address_low = (uintptr_t) NETIO_PKT_L2_DATA_M(mda, pkt) & 0xFF; + v->size = NETIO_PKT_L2_LENGTH_M(mda, pkt); + } + v->handle.word = pkt->__packet.word; + } + else + { + v->handle.word = 0; /* Set handle to NETIO_PKT_HANDLE_NONE. */ + } + + __asm__("" : : : "memory"); + + v->user_data = user_data; +} + + +/** + * Flags and structures for @ref netio_get() and @ref netio_set(). + * @ingroup config + */ + +/** @{ */ +/** Parameter class; addr is a NETIO_PARAM_xxx value. */ +#define NETIO_PARAM 0 +/** Interface MAC address. This address is only valid with @ref netio_get(). + * The value is a 6-byte MAC address. Depending upon the overall system + * design, a MAC address may or may not be available for each interface. */ +#define NETIO_PARAM_MAC 0 + +/** Determine whether to suspend output on the receipt of pause frames. + * If the value is nonzero, the I/O shim will suspend output when a pause + * frame is received. If the value is zero, pause frames will be ignored. */ +#define NETIO_PARAM_PAUSE_IN 1 + +/** Determine whether to send pause frames if the I/O shim packet FIFOs are + * nearly full. If the value is zero, pause frames are not sent. If + * the value is nonzero, it is the delay value which will be sent in any + * pause frames which are output, in units of 512 bit times. */ +#define NETIO_PARAM_PAUSE_OUT 2 + +/** Jumbo frame support. The value is a 4-byte integer. If the value is + * nonzero, the MAC will accept frames of up to 10240 bytes. If the value + * is zero, the MAC will only accept frames of up to 1544 bytes. */ +#define NETIO_PARAM_JUMBO 3 + +/** I/O shim's overflow statistics register. The value is two 16-bit integers. + * The first 16-bit value (or the low 16 bits, if the value is treated as a + * 32-bit number) is the count of packets which were completely dropped and + * not delivered by the shim. The second 16-bit value (or the high 16 bits, + * if the value is treated as a 32-bit number) is the count of packets + * which were truncated and thus only partially delivered by the shim. This + * register is automatically reset to zero after it has been read. + */ +#define NETIO_PARAM_OVERFLOW 4 + +/** IPP statistics. This address is only valid with @ref netio_get(). The + * value is a netio_stat_t structure. Unlike the I/O shim statistics, the + * IPP statistics are not all reset to zero on read; see the description + * of the netio_stat_t for details. */ +#define NETIO_PARAM_STAT 5 + +/** Possible link state. The value is a combination of "NETIO_LINK_xxx" + * flags. With @ref netio_get(), this will indicate which flags are + * actually supported by the hardware. + * + * For historical reasons, specifying this value to netio_set() will have + * the same behavior as using ::NETIO_PARAM_LINK_CONFIG, but this usage is + * discouraged. + */ +#define NETIO_PARAM_LINK_POSSIBLE_STATE 6 + +/** Link configuration. The value is a combination of "NETIO_LINK_xxx" flags. + * With @ref netio_set(), this will attempt to immediately bring up the + * link using whichever of the requested flags are supported by the + * hardware, or take down the link if the flags are zero; if this is + * not possible, an error will be returned. Many programs will want + * to use ::NETIO_PARAM_LINK_DESIRED_STATE instead. + * + * For historical reasons, specifying this value to netio_get() will + * have the same behavior as using ::NETIO_PARAM_LINK_POSSIBLE_STATE, + * but this usage is discouraged. + */ +#define NETIO_PARAM_LINK_CONFIG NETIO_PARAM_LINK_POSSIBLE_STATE + +/** Current link state. This address is only valid with @ref netio_get(). + * The value is zero or more of the "NETIO_LINK_xxx" flags, ORed together. + * If the link is down, the value ANDed with NETIO_LINK_SPEED will be + * zero; if the link is up, the value ANDed with NETIO_LINK_SPEED will + * result in exactly one of the NETIO_LINK_xxx values, indicating the + * current speed. */ +#define NETIO_PARAM_LINK_CURRENT_STATE 7 + +/** Variant symbol for current state, retained for compatibility with + * pre-MDE-2.1 programs. */ +#define NETIO_PARAM_LINK_STATUS NETIO_PARAM_LINK_CURRENT_STATE + +/** Packet Coherence protocol. This address is only valid with @ref netio_get(). + * The value is nonzero if the interface is configured for cache-coherent DMA. + */ +#define NETIO_PARAM_COHERENT 8 + +/** Desired link state. The value is a conbination of "NETIO_LINK_xxx" + * flags, which specify the desired state for the link. With @ref + * netio_set(), this will, in the background, attempt to bring up the link + * using whichever of the requested flags are reasonable, or take down the + * link if the flags are zero. The actual link up or down operation may + * happen after this call completes. If the link state changes in the + * future, the system will continue to try to get back to the desired link + * state; for instance, if the link is brought up successfully, and then + * the network cable is disconnected, the link will go down. However, the + * desired state of the link is still up, so if the cable is reconnected, + * the link will be brought up again. + * + * With @ref netio_get(), this will indicate the desired state for the + * link, as set with a previous netio_set() call, or implicitly by a + * netio_input_register() or netio_input_unregister() operation. This may + * not reflect the current state of the link; to get that, use + * ::NETIO_PARAM_LINK_CURRENT_STATE. */ +#define NETIO_PARAM_LINK_DESIRED_STATE 9 + +/** NetIO statistics structure. Retrieved using the ::NETIO_PARAM_STAT + * address passed to @ref netio_get(). */ +typedef struct +{ + /** Number of packets which have been received by the IPP and forwarded + * to a tile's receive queue for processing. This value wraps at its + * maximum, and is not cleared upon read. */ + uint32_t packets_received; + + /** Number of packets which have been dropped by the IPP, because they could + * not be received, or could not be forwarded to a tile. The former happens + * when the IPP does not have a free packet buffer of suitable size for an + * incoming frame. The latter happens when all potential destination tiles + * for a packet, as defined by the group, bucket, and queue configuration, + * have full receive queues. This value wraps at its maximum, and is not + * cleared upon read. */ + uint32_t packets_dropped; + + /* + * Note: the #defines after each of the following four one-byte values + * denote their location within the third word of the netio_stat_t. They + * are intended for use only by the IPP implementation and are thus omitted + * from the Doxygen output. + */ + + /** Number of packets dropped because no worker was able to accept a new + * packet. This value saturates at its maximum, and is cleared upon + * read. */ + uint8_t drops_no_worker; +#ifndef __DOXYGEN__ +#define NETIO_STAT_DROPS_NO_WORKER 0 +#endif + + /** Number of packets dropped because no small buffers were available. + * This value saturates at its maximum, and is cleared upon read. */ + uint8_t drops_no_smallbuf; +#ifndef __DOXYGEN__ +#define NETIO_STAT_DROPS_NO_SMALLBUF 1 +#endif + + /** Number of packets dropped because no large buffers were available. + * This value saturates at its maximum, and is cleared upon read. */ + uint8_t drops_no_largebuf; +#ifndef __DOXYGEN__ +#define NETIO_STAT_DROPS_NO_LARGEBUF 2 +#endif + + /** Number of packets dropped because no jumbo buffers were available. + * This value saturates at its maximum, and is cleared upon read. */ + uint8_t drops_no_jumbobuf; +#ifndef __DOXYGEN__ +#define NETIO_STAT_DROPS_NO_JUMBOBUF 3 +#endif +} +netio_stat_t; + + +/** Link can run, should run, or is running at 10 Mbps. */ +#define NETIO_LINK_10M 0x01 + +/** Link can run, should run, or is running at 100 Mbps. */ +#define NETIO_LINK_100M 0x02 + +/** Link can run, should run, or is running at 1 Gbps. */ +#define NETIO_LINK_1G 0x04 + +/** Link can run, should run, or is running at 10 Gbps. */ +#define NETIO_LINK_10G 0x08 + +/** Link should run at the highest speed supported by the link and by + * the device connected to the link. Only usable as a value for + * the link's desired state; never returned as a value for the current + * or possible states. */ +#define NETIO_LINK_ANYSPEED 0x10 + +/** All legal link speeds. */ +#define NETIO_LINK_SPEED (NETIO_LINK_10M | \ + NETIO_LINK_100M | \ + NETIO_LINK_1G | \ + NETIO_LINK_10G | \ + NETIO_LINK_ANYSPEED) + + +/** MAC register class. Addr is a register offset within the MAC. + * Registers within the XGbE and GbE MACs are documented in the Tile + * Processor I/O Device Guide (UG104). MAC registers start at address + * 0x4000, and do not include the MAC_INTERFACE registers. */ +#define NETIO_MAC 1 + +/** MDIO register class (IEEE 802.3 clause 22 format). Addr is the "addr" + * member of a netio_mdio_addr_t structure. */ +#define NETIO_MDIO 2 + +/** MDIO register class (IEEE 802.3 clause 45 format). Addr is the "addr" + * member of a netio_mdio_addr_t structure. */ +#define NETIO_MDIO_CLAUSE45 3 + +/** NetIO MDIO address type. Retrieved or provided using the ::NETIO_MDIO + * address passed to @ref netio_get() or @ref netio_set(). */ +typedef union +{ + struct + { + unsigned int reg:16; /**< MDIO register offset. For clause 22 access, + must be less than 32. */ + unsigned int phy:5; /**< Which MDIO PHY to access. */ + unsigned int dev:5; /**< Which MDIO device to access within that PHY. + Applicable for clause 45 access only; ignored + for clause 22 access. */ + } + bits; /**< Container for bitfields. */ + uint64_t addr; /**< Value to pass to @ref netio_get() or + * @ref netio_set(). */ +} +netio_mdio_addr_t; + +/** @} */ + +#endif /* __NETIO_INTF_H__ */ diff --git a/arch/tile/kernel/Makefile b/arch/tile/kernel/Makefile index 112b1e248f05..b4c8e8ec45dc 100644 --- a/arch/tile/kernel/Makefile +++ b/arch/tile/kernel/Makefile @@ -15,3 +15,4 @@ obj-$(CONFIG_SMP) += smpboot.o smp.o tlb.o obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o +obj-$(CONFIG_PCI) += pci.o diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c index 543d6a33aa26..dbb0dfc7bece 100644 --- a/arch/tile/kernel/compat_signal.c +++ b/arch/tile/kernel/compat_signal.c @@ -290,12 +290,12 @@ long compat_sys_sigaltstack(const struct compat_sigaltstack __user *uss_ptr, return ret; } +/* The assembly shim for this function arranges to ignore the return value. */ long compat_sys_rt_sigreturn(struct pt_regs *regs) { struct compat_rt_sigframe __user *frame = (struct compat_rt_sigframe __user *) compat_ptr(regs->sp); sigset_t set; - long r0; if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) goto badframe; @@ -308,13 +308,13 @@ long compat_sys_rt_sigreturn(struct pt_regs *regs) recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); - if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) + if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) goto badframe; if (compat_sys_sigaltstack(&frame->uc.uc_stack, NULL, regs) != 0) goto badframe; - return r0; + return 0; badframe: force_sig(SIGSEGV, current); diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S index f5821626247f..5eed4a02bf62 100644 --- a/arch/tile/kernel/intvec_32.S +++ b/arch/tile/kernel/intvec_32.S @@ -1342,8 +1342,8 @@ handle_syscall: lw r20, r20 /* Jump to syscall handler. */ - jalr r20; .Lhandle_syscall_link: - FEEDBACK_REENTER(handle_syscall) + jalr r20 +.Lhandle_syscall_link: /* value of "lr" after "jalr r20" above */ /* * Write our r0 onto the stack so it gets restored instead @@ -1352,6 +1352,9 @@ handle_syscall: PTREGS_PTR(r29, PTREGS_OFFSET_REG(0)) sw r29, r0 +.Lsyscall_sigreturn_skip: + FEEDBACK_REENTER(handle_syscall) + /* Do syscall trace again, if requested. */ lw r30, r31 andi r30, r30, _TIF_SYSCALL_TRACE @@ -1536,9 +1539,24 @@ STD_ENTRY_LOCAL(bad_intr) }; \ STD_ENDPROC(_##x) +/* + * Special-case sigreturn to not write r0 to the stack on return. + * This is technically more efficient, but it also avoids difficulties + * in the 64-bit OS when handling 32-bit compat code, since we must not + * sign-extend r0 for the sigreturn return-value case. + */ +#define PTREGS_SYSCALL_SIGRETURN(x, reg) \ + STD_ENTRY(_##x); \ + addli lr, lr, .Lsyscall_sigreturn_skip - .Lhandle_syscall_link; \ + { \ + PTREGS_PTR(reg, PTREGS_OFFSET_BASE); \ + j x \ + }; \ + STD_ENDPROC(_##x) + PTREGS_SYSCALL(sys_execve, r3) PTREGS_SYSCALL(sys_sigaltstack, r2) -PTREGS_SYSCALL(sys_rt_sigreturn, r0) +PTREGS_SYSCALL_SIGRETURN(sys_rt_sigreturn, r0) PTREGS_SYSCALL(sys_cmpxchg_badaddr, r1) /* Save additional callee-saves to pt_regs, put address in r4 and jump. */ diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c new file mode 100644 index 000000000000..a1ee25be9ad9 --- /dev/null +++ b/arch/tile/kernel/pci.c @@ -0,0 +1,621 @@ +/* + * Copyright 2010 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/capability.h> +#include <linux/sched.h> +#include <linux/errno.h> +#include <linux/bootmem.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/uaccess.h> + +#include <asm/processor.h> +#include <asm/sections.h> +#include <asm/byteorder.h> +#include <asm/hv_driver.h> +#include <hv/drv_pcie_rc_intf.h> + + +/* + * Initialization flow and process + * ------------------------------- + * + * This files containes the routines to search for PCI buses, + * enumerate the buses, and configure any attached devices. + * + * There are two entry points here: + * 1) tile_pci_init + * This sets up the pci_controller structs, and opens the + * FDs to the hypervisor. This is called from setup_arch() early + * in the boot process. + * 2) pcibios_init + * This probes the PCI bus(es) for any attached hardware. It's + * called by subsys_initcall. All of the real work is done by the + * generic Linux PCI layer. + * + */ + +/* + * This flag tells if the platform is TILEmpower that needs + * special configuration for the PLX switch chip. + */ +int __write_once tile_plx_gen1; + +static struct pci_controller controllers[TILE_NUM_PCIE]; +static int num_controllers; + +static struct pci_ops tile_cfg_ops; + + +/* + * We don't need to worry about the alignment of resources. + */ +resource_size_t pcibios_align_resource(void *data, const struct resource *res, + resource_size_t size, resource_size_t align) +{ + return res->start; +} +EXPORT_SYMBOL(pcibios_align_resource); + +/* + * Open a FD to the hypervisor PCI device. + * + * controller_id is the controller number, config type is 0 or 1 for + * config0 or config1 operations. + */ +static int __init tile_pcie_open(int controller_id, int config_type) +{ + char filename[32]; + int fd; + + sprintf(filename, "pcie/%d/config%d", controller_id, config_type); + + fd = hv_dev_open((HV_VirtAddr)filename, 0); + + return fd; +} + + +/* + * Get the IRQ numbers from the HV and set up the handlers for them. + */ +static int __init tile_init_irqs(int controller_id, + struct pci_controller *controller) +{ + char filename[32]; + int fd; + int ret; + int x; + struct pcie_rc_config rc_config; + + sprintf(filename, "pcie/%d/ctl", controller_id); + fd = hv_dev_open((HV_VirtAddr)filename, 0); + if (fd < 0) { + pr_err("PCI: hv_dev_open(%s) failed\n", filename); + return -1; + } + ret = hv_dev_pread(fd, 0, (HV_VirtAddr)(&rc_config), + sizeof(rc_config), PCIE_RC_CONFIG_MASK_OFF); + hv_dev_close(fd); + if (ret != sizeof(rc_config)) { + pr_err("PCI: wanted %zd bytes, got %d\n", + sizeof(rc_config), ret); + return -1; + } + /* Record irq_base so that we can map INTx to IRQ # later. */ + controller->irq_base = rc_config.intr; + + for (x = 0; x < 4; x++) + tile_irq_activate(rc_config.intr + x, + TILE_IRQ_HW_CLEAR); + + if (rc_config.plx_gen1) + controller->plx_gen1 = 1; + + return 0; +} + +/* + * First initialization entry point, called from setup_arch(). + * + * Find valid controllers and fill in pci_controller structs for each + * of them. + * + * Returns the number of controllers discovered. + */ +int __init tile_pci_init(void) +{ + int i; + + pr_info("PCI: Searching for controllers...\n"); + + /* Do any configuration we need before using the PCIe */ + + for (i = 0; i < TILE_NUM_PCIE; i++) { + int hv_cfg_fd0 = -1; + int hv_cfg_fd1 = -1; + int hv_mem_fd = -1; + char name[32]; + struct pci_controller *controller; + + /* + * Open the fd to the HV. If it fails then this + * device doesn't exist. + */ + hv_cfg_fd0 = tile_pcie_open(i, 0); + if (hv_cfg_fd0 < 0) + continue; + hv_cfg_fd1 = tile_pcie_open(i, 1); + if (hv_cfg_fd1 < 0) { + pr_err("PCI: Couldn't open config fd to HV " + "for controller %d\n", i); + goto err_cont; + } + + sprintf(name, "pcie/%d/mem", i); + hv_mem_fd = hv_dev_open((HV_VirtAddr)name, 0); + if (hv_mem_fd < 0) { + pr_err("PCI: Could not open mem fd to HV!\n"); + goto err_cont; + } + + pr_info("PCI: Found PCI controller #%d\n", i); + + controller = &controllers[num_controllers]; + + if (tile_init_irqs(i, controller)) { + pr_err("PCI: Could not initialize " + "IRQs, aborting.\n"); + goto err_cont; + } + + controller->index = num_controllers; + controller->hv_cfg_fd[0] = hv_cfg_fd0; + controller->hv_cfg_fd[1] = hv_cfg_fd1; + controller->hv_mem_fd = hv_mem_fd; + controller->first_busno = 0; + controller->last_busno = 0xff; + controller->ops = &tile_cfg_ops; + + num_controllers++; + continue; + +err_cont: + if (hv_cfg_fd0 >= 0) + hv_dev_close(hv_cfg_fd0); + if (hv_cfg_fd1 >= 0) + hv_dev_close(hv_cfg_fd1); + if (hv_mem_fd >= 0) + hv_dev_close(hv_mem_fd); + continue; + } + + /* + * Before using the PCIe, see if we need to do any platform-specific + * configuration, such as the PLX switch Gen 1 issue on TILEmpower. + */ + for (i = 0; i < num_controllers; i++) { + struct pci_controller *controller = &controllers[i]; + + if (controller->plx_gen1) + tile_plx_gen1 = 1; + } + + return num_controllers; +} + +/* + * (pin - 1) converts from the PCI standard's [1:4] convention to + * a normal [0:3] range. + */ +static int tile_map_irq(struct pci_dev *dev, u8 slot, u8 pin) +{ + struct pci_controller *controller = + (struct pci_controller *)dev->sysdata; + return (pin - 1) + controller->irq_base; +} + + +static void __init fixup_read_and_payload_sizes(void) +{ + struct pci_dev *dev = NULL; + int smallest_max_payload = 0x1; /* Tile maxes out at 256 bytes. */ + int max_read_size = 0x2; /* Limit to 512 byte reads. */ + u16 new_values; + + /* Scan for the smallest maximum payload size. */ + while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { + int pcie_caps_offset; + u32 devcap; + int max_payload; + + pcie_caps_offset = pci_find_capability(dev, PCI_CAP_ID_EXP); + if (pcie_caps_offset == 0) + continue; + + pci_read_config_dword(dev, pcie_caps_offset + PCI_EXP_DEVCAP, + &devcap); + max_payload = devcap & PCI_EXP_DEVCAP_PAYLOAD; + if (max_payload < smallest_max_payload) + smallest_max_payload = max_payload; + } + + /* Now, set the max_payload_size for all devices to that value. */ + new_values = (max_read_size << 12) | (smallest_max_payload << 5); + while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { + int pcie_caps_offset; + u16 devctl; + + pcie_caps_offset = pci_find_capability(dev, PCI_CAP_ID_EXP); + if (pcie_caps_offset == 0) + continue; + + pci_read_config_word(dev, pcie_caps_offset + PCI_EXP_DEVCTL, + &devctl); + devctl &= ~(PCI_EXP_DEVCTL_PAYLOAD | PCI_EXP_DEVCTL_READRQ); + devctl |= new_values; + pci_write_config_word(dev, pcie_caps_offset + PCI_EXP_DEVCTL, + devctl); + } +} + + +/* + * Second PCI initialization entry point, called by subsys_initcall. + * + * The controllers have been set up by the time we get here, by a call to + * tile_pci_init. + */ +static int __init pcibios_init(void) +{ + int i; + + pr_info("PCI: Probing PCI hardware\n"); + + /* + * Delay a bit in case devices aren't ready. Some devices are + * known to require at least 20ms here, but we use a more + * conservative value. + */ + mdelay(250); + + /* Scan all of the recorded PCI controllers. */ + for (i = 0; i < num_controllers; i++) { + struct pci_controller *controller = &controllers[i]; + struct pci_bus *bus; + + pr_info("PCI: initializing controller #%d\n", i); + + /* + * This comes from the generic Linux PCI driver. + * + * It reads the PCI tree for this bus into the Linux + * data structures. + * + * This is inlined in linux/pci.h and calls into + * pci_scan_bus_parented() in probe.c. + */ + bus = pci_scan_bus(0, controller->ops, controller); + controller->root_bus = bus; + controller->last_busno = bus->subordinate; + + } + + /* Do machine dependent PCI interrupt routing */ + pci_fixup_irqs(pci_common_swizzle, tile_map_irq); + + /* + * This comes from the generic Linux PCI driver. + * + * It allocates all of the resources (I/O memory, etc) + * associated with the devices read in above. + */ + + pci_assign_unassigned_resources(); + + /* Configure the max_read_size and max_payload_size values. */ + fixup_read_and_payload_sizes(); + + /* Record the I/O resources in the PCI controller structure. */ + for (i = 0; i < num_controllers; i++) { + struct pci_bus *root_bus = controllers[i].root_bus; + struct pci_bus *next_bus; + struct pci_dev *dev; + + list_for_each_entry(dev, &root_bus->devices, bus_list) { + /* Find the PCI host controller, ie. the 1st bridge. */ + if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && + (PCI_SLOT(dev->devfn) == 0)) { + next_bus = dev->subordinate; + controllers[i].mem_resources[0] = + *next_bus->resource[0]; + controllers[i].mem_resources[1] = + *next_bus->resource[1]; + controllers[i].mem_resources[2] = + *next_bus->resource[2]; + + break; + } + } + + } + + return 0; +} +subsys_initcall(pcibios_init); + +/* + * No bus fixups needed. + */ +void __devinit pcibios_fixup_bus(struct pci_bus *bus) +{ + /* Nothing needs to be done. */ +} + +/* + * This can be called from the generic PCI layer, but doesn't need to + * do anything. + */ +char __devinit *pcibios_setup(char *str) +{ + /* Nothing needs to be done. */ + return str; +} + +/* + * This is called from the generic Linux layer. + */ +void __init pcibios_update_irq(struct pci_dev *dev, int irq) +{ + pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq); +} + +/* + * Enable memory and/or address decoding, as appropriate, for the + * device described by the 'dev' struct. + * + * This is called from the generic PCI layer, and can be called + * for bridges or endpoints. + */ +int pcibios_enable_device(struct pci_dev *dev, int mask) +{ + u16 cmd, old_cmd; + u8 header_type; + int i; + struct resource *r; + + pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type); + + pci_read_config_word(dev, PCI_COMMAND, &cmd); + old_cmd = cmd; + if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) { + /* + * For bridges, we enable both memory and I/O decoding + * in call cases. + */ + cmd |= PCI_COMMAND_IO; + cmd |= PCI_COMMAND_MEMORY; + } else { + /* + * For endpoints, we enable memory and/or I/O decoding + * only if they have a memory resource of that type. + */ + for (i = 0; i < 6; i++) { + r = &dev->resource[i]; + if (r->flags & IORESOURCE_UNSET) { + pr_err("PCI: Device %s not available " + "because of resource collisions\n", + pci_name(dev)); + return -EINVAL; + } + if (r->flags & IORESOURCE_IO) + cmd |= PCI_COMMAND_IO; + if (r->flags & IORESOURCE_MEM) + cmd |= PCI_COMMAND_MEMORY; + } + } + + /* + * We only write the command if it changed. + */ + if (cmd != old_cmd) + pci_write_config_word(dev, PCI_COMMAND, cmd); + return 0; +} + +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max) +{ + unsigned long start = pci_resource_start(dev, bar); + unsigned long len = pci_resource_len(dev, bar); + unsigned long flags = pci_resource_flags(dev, bar); + + if (!len) + return NULL; + if (max && len > max) + len = max; + + if (!(flags & IORESOURCE_MEM)) { + pr_info("PCI: Trying to map invalid resource %#lx\n", flags); + start = 0; + } + + return (void __iomem *)start; +} +EXPORT_SYMBOL(pci_iomap); + + +/**************************************************************** + * + * Tile PCI config space read/write routines + * + ****************************************************************/ + +/* + * These are the normal read and write ops + * These are expanded with macros from pci_bus_read_config_byte() etc. + * + * devfn is the combined PCI slot & function. + * + * offset is in bytes, from the start of config space for the + * specified bus & slot. + */ + +static int __devinit tile_cfg_read(struct pci_bus *bus, + unsigned int devfn, + int offset, + int size, + u32 *val) +{ + struct pci_controller *controller = bus->sysdata; + int busnum = bus->number & 0xff; + int slot = (devfn >> 3) & 0x1f; + int function = devfn & 0x7; + u32 addr; + int config_mode = 1; + + /* + * There is no bridge between the Tile and bus 0, so we + * use config0 to talk to bus 0. + * + * If we're talking to a bus other than zero then we + * must have found a bridge. + */ + if (busnum == 0) { + /* + * We fake an empty slot for (busnum == 0) && (slot > 0), + * since there is only one slot on bus 0. + */ + if (slot) { + *val = 0xFFFFFFFF; + return 0; + } + config_mode = 0; + } + + addr = busnum << 20; /* Bus in 27:20 */ + addr |= slot << 15; /* Slot (device) in 19:15 */ + addr |= function << 12; /* Function is in 14:12 */ + addr |= (offset & 0xFFF); /* byte address in 0:11 */ + + return hv_dev_pread(controller->hv_cfg_fd[config_mode], 0, + (HV_VirtAddr)(val), size, addr); +} + + +/* + * See tile_cfg_read() for relevent comments. + * Note that "val" is the value to write, not a pointer to that value. + */ +static int __devinit tile_cfg_write(struct pci_bus *bus, + unsigned int devfn, + int offset, + int size, + u32 val) +{ + struct pci_controller *controller = bus->sysdata; + int busnum = bus->number & 0xff; + int slot = (devfn >> 3) & 0x1f; + int function = devfn & 0x7; + u32 addr; + int config_mode = 1; + HV_VirtAddr valp = (HV_VirtAddr)&val; + + /* + * For bus 0 slot 0 we use config 0 accesses. + */ + if (busnum == 0) { + /* + * We fake an empty slot for (busnum == 0) && (slot > 0), + * since there is only one slot on bus 0. + */ + if (slot) + return 0; + config_mode = 0; + } + + addr = busnum << 20; /* Bus in 27:20 */ + addr |= slot << 15; /* Slot (device) in 19:15 */ + addr |= function << 12; /* Function is in 14:12 */ + addr |= (offset & 0xFFF); /* byte address in 0:11 */ + +#ifdef __BIG_ENDIAN + /* Point to the correct part of the 32-bit "val". */ + valp += 4 - size; +#endif + + return hv_dev_pwrite(controller->hv_cfg_fd[config_mode], 0, + valp, size, addr); +} + + +static struct pci_ops tile_cfg_ops = { + .read = tile_cfg_read, + .write = tile_cfg_write, +}; + + +/* + * In the following, each PCI controller's mem_resources[1] + * represents its (non-prefetchable) PCI memory resource. + * mem_resources[0] and mem_resources[2] refer to its PCI I/O and + * prefetchable PCI memory resources, respectively. + * For more details, see pci_setup_bridge() in setup-bus.c. + * By comparing the target PCI memory address against the + * end address of controller 0, we can determine the controller + * that should accept the PCI memory access. + */ +#define TILE_READ(size, type) \ +type _tile_read##size(unsigned long addr) \ +{ \ + type val; \ + int idx = 0; \ + if (addr > controllers[0].mem_resources[1].end && \ + addr > controllers[0].mem_resources[2].end) \ + idx = 1; \ + if (hv_dev_pread(controllers[idx].hv_mem_fd, 0, \ + (HV_VirtAddr)(&val), sizeof(type), addr)) \ + pr_err("PCI: read %zd bytes at 0x%lX failed\n", \ + sizeof(type), addr); \ + return val; \ +} \ +EXPORT_SYMBOL(_tile_read##size) + +TILE_READ(b, u8); +TILE_READ(w, u16); +TILE_READ(l, u32); +TILE_READ(q, u64); + +#define TILE_WRITE(size, type) \ +void _tile_write##size(type val, unsigned long addr) \ +{ \ + int idx = 0; \ + if (addr > controllers[0].mem_resources[1].end && \ + addr > controllers[0].mem_resources[2].end) \ + idx = 1; \ + if (hv_dev_pwrite(controllers[idx].hv_mem_fd, 0, \ + (HV_VirtAddr)(&val), sizeof(type), addr)) \ + pr_err("PCI: write %zd bytes at 0x%lX failed\n", \ + sizeof(type), addr); \ +} \ +EXPORT_SYMBOL(_tile_write##size) + +TILE_WRITE(b, u8); +TILE_WRITE(w, u16); +TILE_WRITE(l, u32); +TILE_WRITE(q, u64); diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index 8430f45daea6..e90eb53173b0 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -212,6 +212,13 @@ int copy_thread(unsigned long clone_flags, unsigned long sp, childregs->sp = sp; /* override with new user stack pointer */ /* + * If CLONE_SETTLS is set, set "tp" in the new task to "r4", + * which is passed in as arg #5 to sys_clone(). + */ + if (clone_flags & CLONE_SETTLS) + childregs->tp = regs->regs[4]; + + /* * Copy the callee-saved registers from the passed pt_regs struct * into the context-switch callee-saved registers area. * This way when we start the interrupt-return sequence, the @@ -539,6 +546,7 @@ struct task_struct *__sched _switch_to(struct task_struct *prev, return __switch_to(prev, next, next_current_ksp0(next)); } +/* Note there is an implicit fifth argument if (clone_flags & CLONE_SETTLS). */ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp, void __user *, parent_tidptr, void __user *, child_tidptr, struct pt_regs *, regs) diff --git a/arch/tile/kernel/setup.c b/arch/tile/kernel/setup.c index fb0b3cbeae14..f18573643ed1 100644 --- a/arch/tile/kernel/setup.c +++ b/arch/tile/kernel/setup.c @@ -840,7 +840,7 @@ static int __init topology_init(void) for_each_online_node(i) register_one_node(i); - for_each_present_cpu(i) + for (i = 0; i < smp_height * smp_width; ++i) register_cpu(&cpu_devices[i], i); return 0; diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c index 757407e36696..1260321155f1 100644 --- a/arch/tile/kernel/signal.c +++ b/arch/tile/kernel/signal.c @@ -52,7 +52,7 @@ SYSCALL_DEFINE3(sigaltstack, const stack_t __user *, uss, */ int restore_sigcontext(struct pt_regs *regs, - struct sigcontext __user *sc, long *pr0) + struct sigcontext __user *sc) { int err = 0; int i; @@ -75,17 +75,15 @@ int restore_sigcontext(struct pt_regs *regs, regs->faultnum = INT_SWINT_1_SIGRETURN; - err |= __get_user(*pr0, &sc->gregs[0]); return err; } -/* sigreturn() returns long since it restores r0 in the interrupted code. */ +/* The assembly shim for this function arranges to ignore the return value. */ SYSCALL_DEFINE1(rt_sigreturn, struct pt_regs *, regs) { struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->sp); sigset_t set; - long r0; if (!access_ok(VERIFY_READ, frame, sizeof(*frame))) goto badframe; @@ -98,13 +96,13 @@ SYSCALL_DEFINE1(rt_sigreturn, struct pt_regs *, regs) recalc_sigpending(); spin_unlock_irq(¤t->sighand->siglock); - if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &r0)) + if (restore_sigcontext(regs, &frame->uc.uc_mcontext)) goto badframe; if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT) goto badframe; - return r0; + return 0; badframe: force_sig(SIGSEGV, current); diff --git a/arch/tile/lib/memchr_32.c b/arch/tile/lib/memchr_32.c index 6235283b4859..cc3d9badf030 100644 --- a/arch/tile/lib/memchr_32.c +++ b/arch/tile/lib/memchr_32.c @@ -18,12 +18,24 @@ void *memchr(const void *s, int c, size_t n) { + const uint32_t *last_word_ptr; + const uint32_t *p; + const char *last_byte_ptr; + uintptr_t s_int; + uint32_t goal, before_mask, v, bits; + char *ret; + + if (__builtin_expect(n == 0, 0)) { + /* Don't dereference any memory if the array is empty. */ + return NULL; + } + /* Get an aligned pointer. */ - const uintptr_t s_int = (uintptr_t) s; - const uint32_t *p = (const uint32_t *)(s_int & -4); + s_int = (uintptr_t) s; + p = (const uint32_t *)(s_int & -4); /* Create four copies of the byte for which we are looking. */ - const uint32_t goal = 0x01010101 * (uint8_t) c; + goal = 0x01010101 * (uint8_t) c; /* Read the first word, but munge it so that bytes before the array * will not match goal. @@ -31,23 +43,14 @@ void *memchr(const void *s, int c, size_t n) * Note that this shift count expression works because we know * shift counts are taken mod 32. */ - const uint32_t before_mask = (1 << (s_int << 3)) - 1; - uint32_t v = (*p | before_mask) ^ (goal & before_mask); + before_mask = (1 << (s_int << 3)) - 1; + v = (*p | before_mask) ^ (goal & before_mask); /* Compute the address of the last byte. */ - const char *const last_byte_ptr = (const char *)s + n - 1; + last_byte_ptr = (const char *)s + n - 1; /* Compute the address of the word containing the last byte. */ - const uint32_t *const last_word_ptr = - (const uint32_t *)((uintptr_t) last_byte_ptr & -4); - - uint32_t bits; - char *ret; - - if (__builtin_expect(n == 0, 0)) { - /* Don't dereference any memory if the array is empty. */ - return NULL; - } + last_word_ptr = (const uint32_t *)((uintptr_t) last_byte_ptr & -4); while ((bits = __insn_seqb(v, goal)) == 0) { if (__builtin_expect(p == last_word_ptr, 0)) { diff --git a/arch/tile/lib/spinlock_32.c b/arch/tile/lib/spinlock_32.c index 485e24d62c6b..5cd1c4004eca 100644 --- a/arch/tile/lib/spinlock_32.c +++ b/arch/tile/lib/spinlock_32.c @@ -167,23 +167,30 @@ void arch_write_lock_slow(arch_rwlock_t *rwlock, u32 val) * when we compare them. */ u32 my_ticket_; + u32 iterations = 0; - /* Take out the next ticket; this will also stop would-be readers. */ - if (val & 1) - val = get_rwlock(rwlock); - rwlock->lock = __insn_addb(val, 1 << WR_NEXT_SHIFT); + /* + * Wait until there are no readers, then bump up the next + * field and capture the ticket value. + */ + for (;;) { + if (!(val & 1)) { + if ((val >> RD_COUNT_SHIFT) == 0) + break; + rwlock->lock = val; + } + delay_backoff(iterations++); + val = __insn_tns((int *)&rwlock->lock); + } - /* Extract my ticket value from the original word. */ + /* Take out the next ticket and extract my ticket value. */ + rwlock->lock = __insn_addb(val, 1 << WR_NEXT_SHIFT); my_ticket_ = val >> WR_NEXT_SHIFT; - /* - * Wait until the "current" field matches our ticket, and - * there are no remaining readers. - */ + /* Wait until the "current" field matches our ticket. */ for (;;) { u32 curr_ = val >> WR_CURR_SHIFT; - u32 readers = val >> RD_COUNT_SHIFT; - u32 delta = ((my_ticket_ - curr_) & WR_MASK) + !!readers; + u32 delta = ((my_ticket_ - curr_) & WR_MASK); if (likely(delta == 0)) break; |