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70041088e3
This code allows RDS to be tunneled over a TCP connection. RDMA operations are disabled when using TCP transport, but this frees RDS from the IB/RDMA stack dependency, and allows it to be used with standard Ethernet adapters, or in a VM. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
263 lines
7.3 KiB
C
263 lines
7.3 KiB
C
/*
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* Copyright (c) 2008 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#ifndef _LINUX_RDS_H
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#define _LINUX_RDS_H
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#include <linux/types.h>
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/* These sparse annotated types shouldn't be in any user
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* visible header file. We should clean this up rather
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* than kludging around them. */
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#ifndef __KERNEL__
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#define __be16 u_int16_t
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#define __be32 u_int32_t
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#define __be64 u_int64_t
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#endif
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#define RDS_IB_ABI_VERSION 0x301
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/*
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* setsockopt/getsockopt for SOL_RDS
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*/
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#define RDS_CANCEL_SENT_TO 1
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#define RDS_GET_MR 2
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#define RDS_FREE_MR 3
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/* deprecated: RDS_BARRIER 4 */
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#define RDS_RECVERR 5
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#define RDS_CONG_MONITOR 6
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/*
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* Control message types for SOL_RDS.
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*
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* CMSG_RDMA_ARGS (sendmsg)
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* Request a RDMA transfer to/from the specified
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* memory ranges.
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* The cmsg_data is a struct rds_rdma_args.
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* RDS_CMSG_RDMA_DEST (recvmsg, sendmsg)
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* Kernel informs application about intended
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* source/destination of a RDMA transfer
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* RDS_CMSG_RDMA_MAP (sendmsg)
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* Application asks kernel to map the given
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* memory range into a IB MR, and send the
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* R_Key along in an RDS extension header.
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* The cmsg_data is a struct rds_get_mr_args,
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* the same as for the GET_MR setsockopt.
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* RDS_CMSG_RDMA_STATUS (recvmsg)
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* Returns the status of a completed RDMA operation.
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*/
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#define RDS_CMSG_RDMA_ARGS 1
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#define RDS_CMSG_RDMA_DEST 2
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#define RDS_CMSG_RDMA_MAP 3
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#define RDS_CMSG_RDMA_STATUS 4
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#define RDS_CMSG_CONG_UPDATE 5
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#define RDS_INFO_FIRST 10000
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#define RDS_INFO_COUNTERS 10000
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#define RDS_INFO_CONNECTIONS 10001
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/* 10002 aka RDS_INFO_FLOWS is deprecated */
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#define RDS_INFO_SEND_MESSAGES 10003
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#define RDS_INFO_RETRANS_MESSAGES 10004
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#define RDS_INFO_RECV_MESSAGES 10005
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#define RDS_INFO_SOCKETS 10006
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#define RDS_INFO_TCP_SOCKETS 10007
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#define RDS_INFO_IB_CONNECTIONS 10008
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#define RDS_INFO_CONNECTION_STATS 10009
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#define RDS_INFO_IWARP_CONNECTIONS 10010
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#define RDS_INFO_LAST 10010
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struct rds_info_counter {
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u_int8_t name[32];
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u_int64_t value;
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} __attribute__((packed));
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#define RDS_INFO_CONNECTION_FLAG_SENDING 0x01
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#define RDS_INFO_CONNECTION_FLAG_CONNECTING 0x02
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#define RDS_INFO_CONNECTION_FLAG_CONNECTED 0x04
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#define TRANSNAMSIZ 16
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struct rds_info_connection {
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u_int64_t next_tx_seq;
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u_int64_t next_rx_seq;
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__be32 laddr;
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__be32 faddr;
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u_int8_t transport[TRANSNAMSIZ]; /* null term ascii */
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u_int8_t flags;
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} __attribute__((packed));
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struct rds_info_flow {
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__be32 laddr;
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__be32 faddr;
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u_int32_t bytes;
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__be16 lport;
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__be16 fport;
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} __attribute__((packed));
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#define RDS_INFO_MESSAGE_FLAG_ACK 0x01
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#define RDS_INFO_MESSAGE_FLAG_FAST_ACK 0x02
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struct rds_info_message {
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u_int64_t seq;
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u_int32_t len;
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__be32 laddr;
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__be32 faddr;
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__be16 lport;
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__be16 fport;
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u_int8_t flags;
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} __attribute__((packed));
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struct rds_info_socket {
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u_int32_t sndbuf;
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__be32 bound_addr;
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__be32 connected_addr;
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__be16 bound_port;
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__be16 connected_port;
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u_int32_t rcvbuf;
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u_int64_t inum;
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} __attribute__((packed));
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struct rds_info_tcp_socket {
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__be32 local_addr;
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__be16 local_port;
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__be32 peer_addr;
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__be16 peer_port;
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u_int64_t hdr_rem;
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u_int64_t data_rem;
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u_int32_t last_sent_nxt;
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u_int32_t last_expected_una;
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u_int32_t last_seen_una;
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} __attribute__((packed));
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#define RDS_IB_GID_LEN 16
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struct rds_info_rdma_connection {
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__be32 src_addr;
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__be32 dst_addr;
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uint8_t src_gid[RDS_IB_GID_LEN];
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uint8_t dst_gid[RDS_IB_GID_LEN];
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uint32_t max_send_wr;
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uint32_t max_recv_wr;
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uint32_t max_send_sge;
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uint32_t rdma_mr_max;
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uint32_t rdma_mr_size;
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};
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/*
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* Congestion monitoring.
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* Congestion control in RDS happens at the host connection
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* level by exchanging a bitmap marking congested ports.
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* By default, a process sleeping in poll() is always woken
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* up when the congestion map is updated.
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* With explicit monitoring, an application can have more
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* fine-grained control.
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* The application installs a 64bit mask value in the socket,
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* where each bit corresponds to a group of ports.
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* When a congestion update arrives, RDS checks the set of
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* ports that are now uncongested against the list bit mask
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* installed in the socket, and if they overlap, we queue a
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* cong_notification on the socket.
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*
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* To install the congestion monitor bitmask, use RDS_CONG_MONITOR
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* with the 64bit mask.
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* Congestion updates are received via RDS_CMSG_CONG_UPDATE
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* control messages.
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*
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* The correspondence between bits and ports is
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* 1 << (portnum % 64)
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*/
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#define RDS_CONG_MONITOR_SIZE 64
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#define RDS_CONG_MONITOR_BIT(port) (((unsigned int) port) % RDS_CONG_MONITOR_SIZE)
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#define RDS_CONG_MONITOR_MASK(port) (1ULL << RDS_CONG_MONITOR_BIT(port))
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/*
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* RDMA related types
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*/
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/*
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* This encapsulates a remote memory location.
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* In the current implementation, it contains the R_Key
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* of the remote memory region, and the offset into it
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* (so that the application does not have to worry about
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* alignment).
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*/
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typedef u_int64_t rds_rdma_cookie_t;
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struct rds_iovec {
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u_int64_t addr;
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u_int64_t bytes;
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};
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struct rds_get_mr_args {
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struct rds_iovec vec;
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u_int64_t cookie_addr;
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uint64_t flags;
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};
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struct rds_free_mr_args {
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rds_rdma_cookie_t cookie;
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u_int64_t flags;
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};
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struct rds_rdma_args {
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rds_rdma_cookie_t cookie;
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struct rds_iovec remote_vec;
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u_int64_t local_vec_addr;
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u_int64_t nr_local;
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u_int64_t flags;
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u_int64_t user_token;
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};
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struct rds_rdma_notify {
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u_int64_t user_token;
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int32_t status;
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};
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#define RDS_RDMA_SUCCESS 0
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#define RDS_RDMA_REMOTE_ERROR 1
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#define RDS_RDMA_CANCELED 2
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#define RDS_RDMA_DROPPED 3
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#define RDS_RDMA_OTHER_ERROR 4
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/*
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* Common set of flags for all RDMA related structs
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*/
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#define RDS_RDMA_READWRITE 0x0001
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#define RDS_RDMA_FENCE 0x0002 /* use FENCE for immediate send */
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#define RDS_RDMA_INVALIDATE 0x0004 /* invalidate R_Key after freeing MR */
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#define RDS_RDMA_USE_ONCE 0x0008 /* free MR after use */
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#define RDS_RDMA_DONTWAIT 0x0010 /* Don't wait in SET_BARRIER */
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#define RDS_RDMA_NOTIFY_ME 0x0020 /* Notify when operation completes */
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#endif /* IB_RDS_H */
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