include/uapi/linux/rds.h

   1 /* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
   2 /*
   3  * Copyright (c) 2008 Oracle.  All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  *
  33  */
  34
  35 #ifndef _LINUX_RDS_H
  36 #define _LINUX_RDS_H
  37
  38 #include <linux/types.h>
  39 #include <linux/socket.h>               /* For __kernel_sockaddr_storage. */
  40
  41 #define RDS_IB_ABI_VERSION              0x301
  42
  43 #define SOL_RDS         276
  44
  45 /*
  46  * setsockopt/getsockopt for SOL_RDS
  47  */
  48 #define RDS_CANCEL_SENT_TO              1
  49 #define RDS_GET_MR                      2
  50 #define RDS_FREE_MR                     3
  51 /* deprecated: RDS_BARRIER 4 */
  52 #define RDS_RECVERR                     5
  53 #define RDS_CONG_MONITOR                6
  54 #define RDS_GET_MR_FOR_DEST             7
  55 #define SO_RDS_TRANSPORT                8
  56
  57 /* Socket option to tap receive path latency
  58  *      SO_RDS: SO_RDS_MSG_RXPATH_LATENCY
  59  *      Format used struct rds_rx_trace_so
  60  */
  61 #define SO_RDS_MSG_RXPATH_LATENCY       10
  62
  63
  64 /* supported values for SO_RDS_TRANSPORT */
  65 #define RDS_TRANS_IB    0
  66 #define RDS_TRANS_IWARP 1
  67 #define RDS_TRANS_TCP   2
  68 #define RDS_TRANS_COUNT 3
  69 #define RDS_TRANS_NONE  (~0)
  70
  71 /*
  72  * Control message types for SOL_RDS.
  73  *
  74  * CMSG_RDMA_ARGS (sendmsg)
  75  *      Request a RDMA transfer to/from the specified
  76  *      memory ranges.
  77  *      The cmsg_data is a struct rds_rdma_args.
  78  * RDS_CMSG_RDMA_DEST (recvmsg, sendmsg)
  79  *      Kernel informs application about intended
  80  *      source/destination of a RDMA transfer
  81  * RDS_CMSG_RDMA_MAP (sendmsg)
  82  *      Application asks kernel to map the given
  83  *      memory range into a IB MR, and send the
  84  *      R_Key along in an RDS extension header.
  85  *      The cmsg_data is a struct rds_get_mr_args,
  86  *      the same as for the GET_MR setsockopt.
  87  * RDS_CMSG_RDMA_STATUS (recvmsg)
  88  *      Returns the status of a completed RDMA operation.
  89  * RDS_CMSG_RXPATH_LATENCY(recvmsg)
  90  *      Returns rds message latencies in various stages of receive
  91  *      path in nS. Its set per socket using SO_RDS_MSG_RXPATH_LATENCY
  92  *      socket option. Legitimate points are defined in
  93  *      enum rds_message_rxpath_latency. More points can be added in
  94  *      future. CSMG format is struct rds_cmsg_rx_trace.
  95  */
  96 #define RDS_CMSG_RDMA_ARGS              1
  97 #define RDS_CMSG_RDMA_DEST              2
  98 #define RDS_CMSG_RDMA_MAP               3
  99 #define RDS_CMSG_RDMA_STATUS            4
 100 #define RDS_CMSG_CONG_UPDATE            5
 101 #define RDS_CMSG_ATOMIC_FADD            6
 102 #define RDS_CMSG_ATOMIC_CSWP            7
 103 #define RDS_CMSG_MASKED_ATOMIC_FADD     8
 104 #define RDS_CMSG_MASKED_ATOMIC_CSWP     9
 105 #define RDS_CMSG_RXPATH_LATENCY         11
 106
 107 #define RDS_INFO_FIRST                  10000
 108 #define RDS_INFO_COUNTERS               10000
 109 #define RDS_INFO_CONNECTIONS            10001
 110 /* 10002 aka RDS_INFO_FLOWS is deprecated */
 111 #define RDS_INFO_SEND_MESSAGES          10003
 112 #define RDS_INFO_RETRANS_MESSAGES       10004
 113 #define RDS_INFO_RECV_MESSAGES          10005
 114 #define RDS_INFO_SOCKETS                10006
 115 #define RDS_INFO_TCP_SOCKETS            10007
 116 #define RDS_INFO_IB_CONNECTIONS         10008
 117 #define RDS_INFO_CONNECTION_STATS       10009
 118 #define RDS_INFO_IWARP_CONNECTIONS      10010
 119 #define RDS_INFO_LAST                   10010
 120
 121 struct rds_info_counter {
 122         __u8    name[32];
 123         __u64   value;
 124 } __attribute__((packed));
 125
 126 #define RDS_INFO_CONNECTION_FLAG_SENDING        0x01
 127 #define RDS_INFO_CONNECTION_FLAG_CONNECTING     0x02
 128 #define RDS_INFO_CONNECTION_FLAG_CONNECTED      0x04
 129
 130 #define TRANSNAMSIZ     16
 131
 132 struct rds_info_connection {
 133         __u64           next_tx_seq;
 134         __u64           next_rx_seq;
 135         __be32          laddr;
 136         __be32          faddr;
 137         __u8            transport[TRANSNAMSIZ];         /* null term ascii */
 138         __u8            flags;
 139 } __attribute__((packed));
 140
 141 #define RDS_INFO_MESSAGE_FLAG_ACK               0x01
 142 #define RDS_INFO_MESSAGE_FLAG_FAST_ACK          0x02
 143
 144 struct rds_info_message {
 145         __u64           seq;
 146         __u32           len;
 147         __be32          laddr;
 148         __be32          faddr;
 149         __be16          lport;
 150         __be16          fport;
 151         __u8            flags;
 152 } __attribute__((packed));
 153
 154 struct rds_info_socket {
 155         __u32           sndbuf;
 156         __be32          bound_addr;
 157         __be32          connected_addr;
 158         __be16          bound_port;
 159         __be16          connected_port;
 160         __u32           rcvbuf;
 161         __u64           inum;
 162 } __attribute__((packed));
 163
 164 struct rds_info_tcp_socket {
 165         __be32          local_addr;
 166         __be16          local_port;
 167         __be32          peer_addr;
 168         __be16          peer_port;
 169         __u64           hdr_rem;
 170         __u64           data_rem;
 171         __u32           last_sent_nxt;
 172         __u32           last_expected_una;
 173         __u32           last_seen_una;
 174 } __attribute__((packed));
 175
 176 #define RDS_IB_GID_LEN  16
 177 struct rds_info_rdma_connection {
 178         __be32          src_addr;
 179         __be32          dst_addr;
 180         __u8            src_gid[RDS_IB_GID_LEN];
 181         __u8            dst_gid[RDS_IB_GID_LEN];
 182
 183         __u32           max_send_wr;
 184         __u32           max_recv_wr;
 185         __u32           max_send_sge;
 186         __u32           rdma_mr_max;
 187         __u32           rdma_mr_size;
 188 };
 189
 190 /* RDS message Receive Path Latency points */
 191 enum rds_message_rxpath_latency {
 192         RDS_MSG_RX_HDR_TO_DGRAM_START = 0,
 193         RDS_MSG_RX_DGRAM_REASSEMBLE,
 194         RDS_MSG_RX_DGRAM_DELIVERED,
 195         RDS_MSG_RX_DGRAM_TRACE_MAX
 196 };
 197
 198 struct rds_rx_trace_so {
 199         __u8 rx_traces;
 200         __u8 rx_trace_pos[RDS_MSG_RX_DGRAM_TRACE_MAX];
 201 };
 202
 203 struct rds_cmsg_rx_trace {
 204         __u8 rx_traces;
 205         __u8 rx_trace_pos[RDS_MSG_RX_DGRAM_TRACE_MAX];
 206         __u64 rx_trace[RDS_MSG_RX_DGRAM_TRACE_MAX];
 207 };
 208
 209 /*
 210  * Congestion monitoring.
 211  * Congestion control in RDS happens at the host connection
 212  * level by exchanging a bitmap marking congested ports.
 213  * By default, a process sleeping in poll() is always woken
 214  * up when the congestion map is updated.
 215  * With explicit monitoring, an application can have more
 216  * fine-grained control.
 217  * The application installs a 64bit mask value in the socket,
 218  * where each bit corresponds to a group of ports.
 219  * When a congestion update arrives, RDS checks the set of
 220  * ports that are now uncongested against the list bit mask
 221  * installed in the socket, and if they overlap, we queue a
 222  * cong_notification on the socket.
 223  *
 224  * To install the congestion monitor bitmask, use RDS_CONG_MONITOR
 225  * with the 64bit mask.
 226  * Congestion updates are received via RDS_CMSG_CONG_UPDATE
 227  * control messages.
 228  *
 229  * The correspondence between bits and ports is
 230  *      1 << (portnum % 64)
 231  */
 232 #define RDS_CONG_MONITOR_SIZE   64
 233 #define RDS_CONG_MONITOR_BIT(port)  (((unsigned int) port) % RDS_CONG_MONITOR_SIZE)
 234 #define RDS_CONG_MONITOR_MASK(port) (1ULL << RDS_CONG_MONITOR_BIT(port))
 235
 236 /*
 237  * RDMA related types
 238  */
 239
 240 /*
 241  * This encapsulates a remote memory location.
 242  * In the current implementation, it contains the R_Key
 243  * of the remote memory region, and the offset into it
 244  * (so that the application does not have to worry about
 245  * alignment).
 246  */
 247 typedef __u64           rds_rdma_cookie_t;
 248
 249 struct rds_iovec {
 250         __u64           addr;
 251         __u64           bytes;
 252 };
 253
 254 struct rds_get_mr_args {
 255         struct rds_iovec vec;
 256         __u64           cookie_addr;
 257         __u64           flags;
 258 };
 259
 260 struct rds_get_mr_for_dest_args {
 261         struct __kernel_sockaddr_storage dest_addr;
 262         struct rds_iovec        vec;
 263         __u64                   cookie_addr;
 264         __u64                   flags;
 265 };
 266
 267 struct rds_free_mr_args {
 268         rds_rdma_cookie_t cookie;
 269         __u64           flags;
 270 };
 271
 272 struct rds_rdma_args {
 273         rds_rdma_cookie_t cookie;
 274         struct rds_iovec remote_vec;
 275         __u64           local_vec_addr;
 276         __u64           nr_local;
 277         __u64           flags;
 278         __u64           user_token;
 279 };
 280
 281 struct rds_atomic_args {
 282         rds_rdma_cookie_t cookie;
 283         __u64           local_addr;
 284         __u64           remote_addr;
 285         union {
 286                 struct {
 287                         __u64           compare;
 288                         __u64           swap;
 289                 } cswp;
 290                 struct {
 291                         __u64           add;
 292                 } fadd;
 293                 struct {
 294                         __u64           compare;
 295                         __u64           swap;
 296                         __u64           compare_mask;
 297                         __u64           swap_mask;
 298                 } m_cswp;
 299                 struct {
 300                         __u64           add;
 301                         __u64           nocarry_mask;
 302                 } m_fadd;
 303         };
 304         __u64           flags;
 305         __u64           user_token;
 306 };
 307
 308 struct rds_rdma_notify {
 309         __u64           user_token;
 310         __s32           status;
 311 };
 312
 313 #define RDS_RDMA_SUCCESS        0
 314 #define RDS_RDMA_REMOTE_ERROR   1
 315 #define RDS_RDMA_CANCELED       2
 316 #define RDS_RDMA_DROPPED        3
 317 #define RDS_RDMA_OTHER_ERROR    4
 318
 319 /*
 320  * Common set of flags for all RDMA related structs
 321  */
 322 #define RDS_RDMA_READWRITE      0x0001
 323 #define RDS_RDMA_FENCE          0x0002  /* use FENCE for immediate send */
 324 #define RDS_RDMA_INVALIDATE     0x0004  /* invalidate R_Key after freeing MR */
 325 #define RDS_RDMA_USE_ONCE       0x0008  /* free MR after use */
 326 #define RDS_RDMA_DONTWAIT       0x0010  /* Don't wait in SET_BARRIER */
 327 #define RDS_RDMA_NOTIFY_ME      0x0020  /* Notify when operation completes */
 328 #define RDS_RDMA_SILENT         0x0040  /* Do not interrupt remote */
 329
 330 #endif /* IB_RDS_H */