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/*
* aQuantia Corporation Network Driver
* Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
/* File aq_ring.h: Declaration of functions for Rx/Tx rings. */
#ifndef AQ_RING_H
#define AQ_RING_H
#include "aq_common.h"
struct page;
/* TxC SOP DX EOP
* +----------+----------+----------+-----------
* 8bytes|len l3,l4 | pa | pa | pa
* +----------+----------+----------+-----------
* 4/8bytes|len pkt |len pkt | | skb
* +----------+----------+----------+-----------
* 4/8bytes|is_txc |len,flags |len |len,is_eop
* +----------+----------+----------+-----------
*
* This aq_ring_buff_s doesn't have endianness dependency.
* It is __packed for cache line optimizations.
*/
struct __packed aq_ring_buff_s {
union {
/* RX */
struct {
u32 rss_hash;
u16 next;
u8 is_hash_l4;
u8 rsvd1;
struct page *page;
};
/* EOP */
struct {
dma_addr_t pa_eop;
struct sk_buff *skb;
};
/* DX */
struct {
dma_addr_t pa;
};
/* SOP */
struct {
dma_addr_t pa_sop;
u32 len_pkt_sop;
};
/* TxC */
struct {
u32 mss;
u8 len_l2;
u8 len_l3;
u8 len_l4;
u8 is_ipv6:1;
u8 rsvd2:7;
u32 len_pkt;
};
};
union {
struct {
u32 len:16;
u32 is_ip_cso:1;
u32 is_udp_cso:1;
u32 is_tcp_cso:1;
u32 is_cso_err:1;
u32 is_sop:1;
u32 is_eop:1;
u32 is_txc:1;
u32 is_mapped:1;
u32 is_cleaned:1;
u32 is_error:1;
u32 rsvd3:6;
};
u32 flags;
};
};
struct aq_ring_stats_rx_s {
u64 errors;
u64 packets;
u64 bytes;
u64 lro_packets;
u64 jumbo_packets;
};
struct aq_ring_stats_tx_s {
u64 errors;
u64 packets;
u64 bytes;
};
union aq_ring_stats_s {
struct aq_ring_stats_rx_s rx;
struct aq_ring_stats_tx_s tx;
};
struct aq_ring_s {
struct aq_obj_s header;
struct aq_ring_buff_s *buff_ring;
u8 *dx_ring; /* descriptors ring, dma shared mem */
struct aq_nic_s *aq_nic;
unsigned int idx; /* for HW layer registers operations */
unsigned int hw_head;
unsigned int sw_head;
unsigned int sw_tail;
unsigned int size; /* descriptors number */
unsigned int dx_size; /* TX or RX descriptor size, */
/* stored here for fater math */
union aq_ring_stats_s stats;
dma_addr_t dx_ring_pa;
};
struct aq_ring_param_s {
unsigned int vec_idx;
unsigned int cpu;
cpumask_t affinity_mask;
};
static inline unsigned int aq_ring_next_dx(struct aq_ring_s *self,
unsigned int dx)
{
return (++dx >= self->size) ? 0U : dx;
}
static inline unsigned int aq_ring_avail_dx(struct aq_ring_s *self)
{
return (((self->sw_tail >= self->sw_head)) ?
(self->size - 1) - self->sw_tail + self->sw_head :
self->sw_head - self->sw_tail - 1);
}
struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
struct aq_nic_s *aq_nic,
unsigned int idx,
struct aq_nic_cfg_s *aq_nic_cfg);
struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
struct aq_nic_s *aq_nic,
unsigned int idx,
struct aq_nic_cfg_s *aq_nic_cfg);
int aq_ring_init(struct aq_ring_s *self);
void aq_ring_rx_deinit(struct aq_ring_s *self);
void aq_ring_free(struct aq_ring_s *self);
void aq_ring_tx_clean(struct aq_ring_s *self);
int aq_ring_rx_clean(struct aq_ring_s *self, int *work_done, int budget);
int aq_ring_rx_fill(struct aq_ring_s *self);
#endif /* AQ_RING_H */
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