include/uapi/linux/rds.h

   1 /*
   2  * Copyright (c) 2008 Oracle.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  *
  32  */
  33
  34 #ifndef _LINUX_RDS_H
  35 #define _LINUX_RDS_H
  36
  37 #include <linux/types.h>
  38
  39 #define RDS_IB_ABI_VERSION              0x301
  40
  41 #define SOL_RDS         276
  42
  43 /*
  44  * setsockopt/getsockopt for SOL_RDS
  45  */
  46 #define RDS_CANCEL_SENT_TO              1
  47 #define RDS_GET_MR                      2
  48 #define RDS_FREE_MR                     3
  49 /* deprecated: RDS_BARRIER 4 */
  50 #define RDS_RECVERR                     5
  51 #define RDS_CONG_MONITOR                6
  52 #define RDS_GET_MR_FOR_DEST             7
  53 #define SO_RDS_TRANSPORT                8
  54
  55 /* supported values for SO_RDS_TRANSPORT */
  56 #define RDS_TRANS_IB    0
  57 #define RDS_TRANS_IWARP 1
  58 #define RDS_TRANS_TCP   2
  59 #define RDS_TRANS_COUNT 3
  60 #define RDS_TRANS_NONE  (~0)
  61
  62 /*
  63  * Control message types for SOL_RDS.
  64  *
  65  * CMSG_RDMA_ARGS (sendmsg)
  66  *      Request a RDMA transfer to/from the specified
  67  *      memory ranges.
  68  *      The cmsg_data is a struct rds_rdma_args.
  69  * RDS_CMSG_RDMA_DEST (recvmsg, sendmsg)
  70  *      Kernel informs application about intended
  71  *      source/destination of a RDMA transfer
  72  * RDS_CMSG_RDMA_MAP (sendmsg)
  73  *      Application asks kernel to map the given
  74  *      memory range into a IB MR, and send the
  75  *      R_Key along in an RDS extension header.
  76  *      The cmsg_data is a struct rds_get_mr_args,
  77  *      the same as for the GET_MR setsockopt.
  78  * RDS_CMSG_RDMA_STATUS (recvmsg)
  79  *      Returns the status of a completed RDMA operation.
  80  */
  81 #define RDS_CMSG_RDMA_ARGS              1
  82 #define RDS_CMSG_RDMA_DEST              2
  83 #define RDS_CMSG_RDMA_MAP               3
  84 #define RDS_CMSG_RDMA_STATUS            4
  85 #define RDS_CMSG_CONG_UPDATE            5
  86 #define RDS_CMSG_ATOMIC_FADD            6
  87 #define RDS_CMSG_ATOMIC_CSWP            7
  88 #define RDS_CMSG_MASKED_ATOMIC_FADD     8
  89 #define RDS_CMSG_MASKED_ATOMIC_CSWP     9
  90
  91 #define RDS_INFO_FIRST                  10000
  92 #define RDS_INFO_COUNTERS               10000
  93 #define RDS_INFO_CONNECTIONS            10001
  94 /* 10002 aka RDS_INFO_FLOWS is deprecated */
  95 #define RDS_INFO_SEND_MESSAGES          10003
  96 #define RDS_INFO_RETRANS_MESSAGES       10004
  97 #define RDS_INFO_RECV_MESSAGES          10005
  98 #define RDS_INFO_SOCKETS                10006
  99 #define RDS_INFO_TCP_SOCKETS            10007
 100 #define RDS_INFO_IB_CONNECTIONS         10008
 101 #define RDS_INFO_CONNECTION_STATS       10009
 102 #define RDS_INFO_IWARP_CONNECTIONS      10010
 103 #define RDS_INFO_LAST                   10010
 104
 105 struct rds_info_counter {
 106         uint8_t name[32];
 107         uint64_t        value;
 108 } __attribute__((packed));
 109
 110 #define RDS_INFO_CONNECTION_FLAG_SENDING        0x01
 111 #define RDS_INFO_CONNECTION_FLAG_CONNECTING     0x02
 112 #define RDS_INFO_CONNECTION_FLAG_CONNECTED      0x04
 113
 114 #define TRANSNAMSIZ     16
 115
 116 struct rds_info_connection {
 117         uint64_t        next_tx_seq;
 118         uint64_t        next_rx_seq;
 119         __be32          laddr;
 120         __be32          faddr;
 121         uint8_t transport[TRANSNAMSIZ];         /* null term ascii */
 122         uint8_t flags;
 123 } __attribute__((packed));
 124
 125 #define RDS_INFO_MESSAGE_FLAG_ACK               0x01
 126 #define RDS_INFO_MESSAGE_FLAG_FAST_ACK          0x02
 127
 128 struct rds_info_message {
 129         uint64_t        seq;
 130         uint32_t        len;
 131         __be32          laddr;
 132         __be32          faddr;
 133         __be16          lport;
 134         __be16          fport;
 135         uint8_t flags;
 136 } __attribute__((packed));
 137
 138 struct rds_info_socket {
 139         uint32_t        sndbuf;
 140         __be32          bound_addr;
 141         __be32          connected_addr;
 142         __be16          bound_port;
 143         __be16          connected_port;
 144         uint32_t        rcvbuf;
 145         uint64_t        inum;
 146 } __attribute__((packed));
 147
 148 struct rds_info_tcp_socket {
 149         __be32          local_addr;
 150         __be16          local_port;
 151         __be32          peer_addr;
 152         __be16          peer_port;
 153         uint64_t       hdr_rem;
 154         uint64_t       data_rem;
 155         uint32_t       last_sent_nxt;
 156         uint32_t       last_expected_una;
 157         uint32_t       last_seen_una;
 158 } __attribute__((packed));
 159
 160 #define RDS_IB_GID_LEN  16
 161 struct rds_info_rdma_connection {
 162         __be32          src_addr;
 163         __be32          dst_addr;
 164         uint8_t         src_gid[RDS_IB_GID_LEN];
 165         uint8_t         dst_gid[RDS_IB_GID_LEN];
 166
 167         uint32_t        max_send_wr;
 168         uint32_t        max_recv_wr;
 169         uint32_t        max_send_sge;
 170         uint32_t        rdma_mr_max;
 171         uint32_t        rdma_mr_size;
 172 };
 173
 174 /*
 175  * Congestion monitoring.
 176  * Congestion control in RDS happens at the host connection
 177  * level by exchanging a bitmap marking congested ports.
 178  * By default, a process sleeping in poll() is always woken
 179  * up when the congestion map is updated.
 180  * With explicit monitoring, an application can have more
 181  * fine-grained control.
 182  * The application installs a 64bit mask value in the socket,
 183  * where each bit corresponds to a group of ports.
 184  * When a congestion update arrives, RDS checks the set of
 185  * ports that are now uncongested against the list bit mask
 186  * installed in the socket, and if they overlap, we queue a
 187  * cong_notification on the socket.
 188  *
 189  * To install the congestion monitor bitmask, use RDS_CONG_MONITOR
 190  * with the 64bit mask.
 191  * Congestion updates are received via RDS_CMSG_CONG_UPDATE
 192  * control messages.
 193  *
 194  * The correspondence between bits and ports is
 195  *      1 << (portnum % 64)
 196  */
 197 #define RDS_CONG_MONITOR_SIZE   64
 198 #define RDS_CONG_MONITOR_BIT(port)  (((unsigned int) port) % RDS_CONG_MONITOR_SIZE)
 199 #define RDS_CONG_MONITOR_MASK(port) (1ULL << RDS_CONG_MONITOR_BIT(port))
 200
 201 /*
 202  * RDMA related types
 203  */
 204
 205 /*
 206  * This encapsulates a remote memory location.
 207  * In the current implementation, it contains the R_Key
 208  * of the remote memory region, and the offset into it
 209  * (so that the application does not have to worry about
 210  * alignment).
 211  */
 212 typedef uint64_t        rds_rdma_cookie_t;
 213
 214 struct rds_iovec {
 215         uint64_t        addr;
 216         uint64_t        bytes;
 217 };
 218
 219 struct rds_get_mr_args {
 220         struct rds_iovec vec;
 221         uint64_t        cookie_addr;
 222         uint64_t        flags;
 223 };
 224
 225 struct rds_get_mr_for_dest_args {
 226         struct sockaddr_storage dest_addr;
 227         struct rds_iovec        vec;
 228         uint64_t                cookie_addr;
 229         uint64_t                flags;
 230 };
 231
 232 struct rds_free_mr_args {
 233         rds_rdma_cookie_t cookie;
 234         uint64_t        flags;
 235 };
 236
 237 struct rds_rdma_args {
 238         rds_rdma_cookie_t cookie;
 239         struct rds_iovec remote_vec;
 240         uint64_t        local_vec_addr;
 241         uint64_t        nr_local;
 242         uint64_t        flags;
 243         uint64_t        user_token;
 244 };
 245
 246 struct rds_atomic_args {
 247         rds_rdma_cookie_t cookie;
 248         uint64_t        local_addr;
 249         uint64_t        remote_addr;
 250         union {
 251                 struct {
 252                         uint64_t        compare;
 253                         uint64_t        swap;
 254                 } cswp;
 255                 struct {
 256                         uint64_t        add;
 257                 } fadd;
 258                 struct {
 259                         uint64_t        compare;
 260                         uint64_t        swap;
 261                         uint64_t        compare_mask;
 262                         uint64_t        swap_mask;
 263                 } m_cswp;
 264                 struct {
 265                         uint64_t        add;
 266                         uint64_t        nocarry_mask;
 267                 } m_fadd;
 268         };
 269         uint64_t        flags;
 270         uint64_t        user_token;
 271 };
 272
 273 struct rds_rdma_notify {
 274         uint64_t        user_token;
 275         int32_t         status;
 276 };
 277
 278 #define RDS_RDMA_SUCCESS        0
 279 #define RDS_RDMA_REMOTE_ERROR   1
 280 #define RDS_RDMA_CANCELED       2
 281 #define RDS_RDMA_DROPPED        3
 282 #define RDS_RDMA_OTHER_ERROR    4
 283
 284 /*
 285  * Common set of flags for all RDMA related structs
 286  */
 287 #define RDS_RDMA_READWRITE      0x0001
 288 #define RDS_RDMA_FENCE          0x0002  /* use FENCE for immediate send */
 289 #define RDS_RDMA_INVALIDATE     0x0004  /* invalidate R_Key after freeing MR */
 290 #define RDS_RDMA_USE_ONCE       0x0008  /* free MR after use */
 291 #define RDS_RDMA_DONTWAIT       0x0010  /* Don't wait in SET_BARRIER */
 292 #define RDS_RDMA_NOTIFY_ME      0x0020  /* Notify when operation completes */
 293 #define RDS_RDMA_SILENT         0x0040  /* Do not interrupt remote */
 294
 295 #endif /* IB_RDS_H */