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Diffstat (limited to 'include/linux/rds.h')
| -rw-r--r-- | include/linux/rds.h | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/include/linux/rds.h b/include/linux/rds.h new file mode 100644 index 000000000000..d91dc91f5443 --- /dev/null +++ b/include/linux/rds.h @@ -0,0 +1,250 @@ +/* + * Copyright (c) 2008 Oracle. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + */ + +#ifndef _LINUX_RDS_H +#define _LINUX_RDS_H + +#include <linux/types.h> + +/* These sparse annotated types shouldn't be in any user + * visible header file. We should clean this up rather + * than kludging around them. */ +#ifndef __KERNEL__ +#define __be16 u_int16_t +#define __be32 u_int32_t +#define __be64 u_int64_t +#endif + +#define RDS_IB_ABI_VERSION 0x301 + +/* + * setsockopt/getsockopt for SOL_RDS + */ +#define RDS_CANCEL_SENT_TO 1 +#define RDS_GET_MR 2 +#define RDS_FREE_MR 3 +/* deprecated: RDS_BARRIER 4 */ +#define RDS_RECVERR 5 +#define RDS_CONG_MONITOR 6 + +/* + * Control message types for SOL_RDS. + * + * CMSG_RDMA_ARGS (sendmsg) + * Request a RDMA transfer to/from the specified + * memory ranges. + * The cmsg_data is a struct rds_rdma_args. + * RDS_CMSG_RDMA_DEST (recvmsg, sendmsg) + * Kernel informs application about intended + * source/destination of a RDMA transfer + * RDS_CMSG_RDMA_MAP (sendmsg) + * Application asks kernel to map the given + * memory range into a IB MR, and send the + * R_Key along in an RDS extension header. + * The cmsg_data is a struct rds_get_mr_args, + * the same as for the GET_MR setsockopt. + * RDS_CMSG_RDMA_STATUS (recvmsg) + * Returns the status of a completed RDMA operation. + */ +#define RDS_CMSG_RDMA_ARGS 1 +#define RDS_CMSG_RDMA_DEST 2 +#define RDS_CMSG_RDMA_MAP 3 +#define RDS_CMSG_RDMA_STATUS 4 +#define RDS_CMSG_CONG_UPDATE 5 + +#define RDS_INFO_FIRST 10000 +#define RDS_INFO_COUNTERS 10000 +#define RDS_INFO_CONNECTIONS 10001 +/* 10002 aka RDS_INFO_FLOWS is deprecated */ +#define RDS_INFO_SEND_MESSAGES 10003 +#define RDS_INFO_RETRANS_MESSAGES 10004 +#define RDS_INFO_RECV_MESSAGES 10005 +#define RDS_INFO_SOCKETS 10006 +#define RDS_INFO_TCP_SOCKETS 10007 +#define RDS_INFO_IB_CONNECTIONS 10008 +#define RDS_INFO_CONNECTION_STATS 10009 +#define RDS_INFO_IWARP_CONNECTIONS 10010 +#define RDS_INFO_LAST 10010 + +struct rds_info_counter { + u_int8_t name[32]; + u_int64_t value; +} __attribute__((packed)); + +#define RDS_INFO_CONNECTION_FLAG_SENDING 0x01 +#define RDS_INFO_CONNECTION_FLAG_CONNECTING 0x02 +#define RDS_INFO_CONNECTION_FLAG_CONNECTED 0x04 + +#define TRANSNAMSIZ 16 + +struct rds_info_connection { + u_int64_t next_tx_seq; + u_int64_t next_rx_seq; + __be32 laddr; + __be32 faddr; + u_int8_t transport[TRANSNAMSIZ]; /* null term ascii */ + u_int8_t flags; +} __attribute__((packed)); + +struct rds_info_flow { + __be32 laddr; + __be32 faddr; + u_int32_t bytes; + __be16 lport; + __be16 fport; +} __attribute__((packed)); + +#define RDS_INFO_MESSAGE_FLAG_ACK 0x01 +#define RDS_INFO_MESSAGE_FLAG_FAST_ACK 0x02 + +struct rds_info_message { + u_int64_t seq; + u_int32_t len; + __be32 laddr; + __be32 faddr; + __be16 lport; + __be16 fport; + u_int8_t flags; +} __attribute__((packed)); + +struct rds_info_socket { + u_int32_t sndbuf; + __be32 bound_addr; + __be32 connected_addr; + __be16 bound_port; + __be16 connected_port; + u_int32_t rcvbuf; + u_int64_t inum; +} __attribute__((packed)); + +#define RDS_IB_GID_LEN 16 +struct rds_info_rdma_connection { + __be32 src_addr; + __be32 dst_addr; + uint8_t src_gid[RDS_IB_GID_LEN]; + uint8_t dst_gid[RDS_IB_GID_LEN]; + + uint32_t max_send_wr; + uint32_t max_recv_wr; + uint32_t max_send_sge; + uint32_t rdma_mr_max; + uint32_t rdma_mr_size; +}; + +/* + * Congestion monitoring. + * Congestion control in RDS happens at the host connection + * level by exchanging a bitmap marking congested ports. + * By default, a process sleeping in poll() is always woken + * up when the congestion map is updated. + * With explicit monitoring, an application can have more + * fine-grained control. + * The application installs a 64bit mask value in the socket, + * where each bit corresponds to a group of ports. + * When a congestion update arrives, RDS checks the set of + * ports that are now uncongested against the list bit mask + * installed in the socket, and if they overlap, we queue a + * cong_notification on the socket. + * + * To install the congestion monitor bitmask, use RDS_CONG_MONITOR + * with the 64bit mask. + * Congestion updates are received via RDS_CMSG_CONG_UPDATE + * control messages. + * + * The correspondence between bits and ports is + * 1 << (portnum % 64) + */ +#define RDS_CONG_MONITOR_SIZE 64 +#define RDS_CONG_MONITOR_BIT(port) (((unsigned int) port) % RDS_CONG_MONITOR_SIZE) +#define RDS_CONG_MONITOR_MASK(port) (1ULL << RDS_CONG_MONITOR_BIT(port)) + +/* + * RDMA related types + */ + +/* + * This encapsulates a remote memory location. + * In the current implementation, it contains the R_Key + * of the remote memory region, and the offset into it + * (so that the application does not have to worry about + * alignment). + */ +typedef u_int64_t rds_rdma_cookie_t; + +struct rds_iovec { + u_int64_t addr; + u_int64_t bytes; +}; + +struct rds_get_mr_args { + struct rds_iovec vec; + u_int64_t cookie_addr; + uint64_t flags; +}; + +struct rds_free_mr_args { + rds_rdma_cookie_t cookie; + u_int64_t flags; +}; + +struct rds_rdma_args { + rds_rdma_cookie_t cookie; + struct rds_iovec remote_vec; + u_int64_t local_vec_addr; + u_int64_t nr_local; + u_int64_t flags; + u_int64_t user_token; +}; + +struct rds_rdma_notify { + u_int64_t user_token; + int32_t status; +}; + +#define RDS_RDMA_SUCCESS 0 +#define RDS_RDMA_REMOTE_ERROR 1 +#define RDS_RDMA_CANCELED 2 +#define RDS_RDMA_DROPPED 3 +#define RDS_RDMA_OTHER_ERROR 4 + +/* + * Common set of flags for all RDMA related structs + */ +#define RDS_RDMA_READWRITE 0x0001 +#define RDS_RDMA_FENCE 0x0002 /* use FENCE for immediate send */ +#define RDS_RDMA_INVALIDATE 0x0004 /* invalidate R_Key after freeing MR */ +#define RDS_RDMA_USE_ONCE 0x0008 /* free MR after use */ +#define RDS_RDMA_DONTWAIT 0x0010 /* Don't wait in SET_BARRIER */ +#define RDS_RDMA_NOTIFY_ME 0x0020 /* Notify when operation completes */ + +#endif /* IB_RDS_H */ |