drivers/staging/lustre/lnet/klnds/socklnd/socklnd_proto.c

   1 /*
   2  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
   3  *
   4  * Copyright (c) 2012, Intel Corporation.
   5  *
   6  *   Author: Zach Brown <zab@zabbo.net>
   7  *   Author: Peter J. Braam <braam@clusterfs.com>
   8  *   Author: Phil Schwan <phil@clusterfs.com>
   9  *   Author: Eric Barton <eric@bartonsoftware.com>
  10  *
  11  *   This file is part of Portals, http://www.sf.net/projects/sandiaportals/
  12  *
  13  *   Portals is free software; you can redistribute it and/or
  14  *   modify it under the terms of version 2 of the GNU General Public
  15  *   License as published by the Free Software Foundation.
  16  *
  17  *   Portals is distributed in the hope that it will be useful,
  18  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  *   GNU General Public License for more details.
  21  *
  22  *   You should have received a copy of the GNU General Public License
  23  *   along with Portals; if not, write to the Free Software
  24  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26
  27 #include "socklnd.h"
  28
  29 /*
  30  * Protocol entries :
  31  *   pro_send_hello       : send hello message
  32  *   pro_recv_hello       : receive hello message
  33  *   pro_pack        : pack message header
  34  *   pro_unpack    : unpack message header
  35  *   pro_queue_tx_zcack() : Called holding BH lock: kss_lock
  36  *                        return 1 if ACK is piggybacked, otherwise return 0
  37  *   pro_queue_tx_msg()   : Called holding BH lock: kss_lock
  38  *                        return the ACK that piggybacked by my message, or NULL
  39  *   pro_handle_zcreq()   : handler of incoming ZC-REQ
  40  *   pro_handle_zcack()   : handler of incoming ZC-ACK
  41  *   pro_match_tx()       : Called holding glock
  42  */
  43
  44 static ksock_tx_t *
  45 ksocknal_queue_tx_msg_v1(ksock_conn_t *conn, ksock_tx_t *tx_msg)
  46 {
  47         /* V1.x, just enqueue it */
  48         list_add_tail(&tx_msg->tx_list, &conn->ksnc_tx_queue);
  49         return NULL;
  50 }
  51
  52 void
  53 ksocknal_next_tx_carrier(ksock_conn_t *conn)
  54 {
  55         ksock_tx_t     *tx = conn->ksnc_tx_carrier;
  56
  57         /* Called holding BH lock: conn->ksnc_scheduler->kss_lock */
  58         LASSERT (!list_empty(&conn->ksnc_tx_queue));
  59         LASSERT (tx != NULL);
  60
  61         /* Next TX that can carry ZC-ACK or LNet message */
  62         if (tx->tx_list.next == &conn->ksnc_tx_queue) {
  63                 /* no more packets queued */
  64                 conn->ksnc_tx_carrier = NULL;
  65         } else {
  66                 conn->ksnc_tx_carrier = list_entry(tx->tx_list.next,
  67                                                        ksock_tx_t, tx_list);
  68                 LASSERT (conn->ksnc_tx_carrier->tx_msg.ksm_type == tx->tx_msg.ksm_type);
  69         }
  70 }
  71
  72 static int
  73 ksocknal_queue_tx_zcack_v2(ksock_conn_t *conn,
  74                            ksock_tx_t *tx_ack, __u64 cookie)
  75 {
  76         ksock_tx_t *tx = conn->ksnc_tx_carrier;
  77
  78         LASSERT (tx_ack == NULL ||
  79                  tx_ack->tx_msg.ksm_type == KSOCK_MSG_NOOP);
  80
  81         /*
  82          * Enqueue or piggyback tx_ack / cookie
  83          * . no tx can piggyback cookie of tx_ack (or cookie), just
  84          *   enqueue the tx_ack (if tx_ack != NUL) and return NULL.
  85          * . There is tx can piggyback cookie of tx_ack (or cookie),
  86          *   piggyback the cookie and return the tx.
  87          */
  88         if (tx == NULL) {
  89                 if (tx_ack != NULL) {
  90                         list_add_tail(&tx_ack->tx_list,
  91                                           &conn->ksnc_tx_queue);
  92                         conn->ksnc_tx_carrier = tx_ack;
  93                 }
  94                 return 0;
  95         }
  96
  97         if (tx->tx_msg.ksm_type == KSOCK_MSG_NOOP) {
  98                 /* tx is noop zc-ack, can't piggyback zc-ack cookie */
  99                 if (tx_ack != NULL)
 100                         list_add_tail(&tx_ack->tx_list,
 101                                           &conn->ksnc_tx_queue);
 102                 return 0;
 103         }
 104
 105         LASSERT(tx->tx_msg.ksm_type == KSOCK_MSG_LNET);
 106         LASSERT(tx->tx_msg.ksm_zc_cookies[1] == 0);
 107
 108         if (tx_ack != NULL)
 109                 cookie = tx_ack->tx_msg.ksm_zc_cookies[1];
 110
 111         /* piggyback the zc-ack cookie */
 112         tx->tx_msg.ksm_zc_cookies[1] = cookie;
 113         /* move on to the next TX which can carry cookie */
 114         ksocknal_next_tx_carrier(conn);
 115
 116         return 1;
 117 }
 118
 119 static ksock_tx_t *
 120 ksocknal_queue_tx_msg_v2(ksock_conn_t *conn, ksock_tx_t *tx_msg)
 121 {
 122         ksock_tx_t  *tx  = conn->ksnc_tx_carrier;
 123
 124         /*
 125          * Enqueue tx_msg:
 126          * . If there is no NOOP on the connection, just enqueue
 127          *   tx_msg and return NULL
 128          * . If there is NOOP on the connection, piggyback the cookie
 129          *   and replace the NOOP tx, and return the NOOP tx.
 130          */
 131         if (tx == NULL) { /* nothing on queue */
 132                 list_add_tail(&tx_msg->tx_list, &conn->ksnc_tx_queue);
 133                 conn->ksnc_tx_carrier = tx_msg;
 134                 return NULL;
 135         }
 136
 137         if (tx->tx_msg.ksm_type == KSOCK_MSG_LNET) { /* nothing to carry */
 138                 list_add_tail(&tx_msg->tx_list, &conn->ksnc_tx_queue);
 139                 return NULL;
 140         }
 141
 142         LASSERT (tx->tx_msg.ksm_type == KSOCK_MSG_NOOP);
 143
 144         /* There is a noop zc-ack can be piggybacked */
 145         tx_msg->tx_msg.ksm_zc_cookies[1] = tx->tx_msg.ksm_zc_cookies[1];
 146         ksocknal_next_tx_carrier(conn);
 147
 148         /* use new_tx to replace the noop zc-ack packet */
 149         list_add(&tx_msg->tx_list, &tx->tx_list);
 150         list_del(&tx->tx_list);
 151
 152         return tx;
 153 }
 154
 155 static int
 156 ksocknal_queue_tx_zcack_v3(ksock_conn_t *conn,
 157                            ksock_tx_t *tx_ack, __u64 cookie)
 158 {
 159         ksock_tx_t *tx;
 160
 161         if (conn->ksnc_type != SOCKLND_CONN_ACK)
 162                 return ksocknal_queue_tx_zcack_v2(conn, tx_ack, cookie);
 163
 164         /* non-blocking ZC-ACK (to router) */
 165         LASSERT (tx_ack == NULL ||
 166                  tx_ack->tx_msg.ksm_type == KSOCK_MSG_NOOP);
 167
 168         tx = conn->ksnc_tx_carrier;
 169         if (tx == NULL) {
 170                 if (tx_ack != NULL) {
 171                         list_add_tail(&tx_ack->tx_list,
 172                                           &conn->ksnc_tx_queue);
 173                         conn->ksnc_tx_carrier = tx_ack;
 174                 }
 175                 return 0;
 176         }
 177
 178         /* conn->ksnc_tx_carrier != NULL */
 179
 180         if (tx_ack != NULL)
 181                 cookie = tx_ack->tx_msg.ksm_zc_cookies[1];
 182
 183         if (cookie == SOCKNAL_KEEPALIVE_PING) /* ignore keepalive PING */
 184                 return 1;
 185
 186         if (tx->tx_msg.ksm_zc_cookies[1] == SOCKNAL_KEEPALIVE_PING) {
 187                 /* replace the keepalive PING with a real ACK */
 188                 LASSERT (tx->tx_msg.ksm_zc_cookies[0] == 0);
 189                 tx->tx_msg.ksm_zc_cookies[1] = cookie;
 190                 return 1;
 191         }
 192
 193         if (cookie == tx->tx_msg.ksm_zc_cookies[0] ||
 194             cookie == tx->tx_msg.ksm_zc_cookies[1]) {
 195                 CWARN("%s: duplicated ZC cookie: "LPU64"\n",
 196                       libcfs_id2str(conn->ksnc_peer->ksnp_id), cookie);
 197                 return 1; /* XXX return error in the future */
 198         }
 199
 200         if (tx->tx_msg.ksm_zc_cookies[0] == 0) {
 201                 /* NOOP tx has only one ZC-ACK cookie, can carry at least one more */
 202                 if (tx->tx_msg.ksm_zc_cookies[1] > cookie) {
 203                         tx->tx_msg.ksm_zc_cookies[0] = tx->tx_msg.ksm_zc_cookies[1];
 204                         tx->tx_msg.ksm_zc_cookies[1] = cookie;
 205                 } else {
 206                         tx->tx_msg.ksm_zc_cookies[0] = cookie;
 207                 }
 208
 209                 if (tx->tx_msg.ksm_zc_cookies[0] - tx->tx_msg.ksm_zc_cookies[1] > 2) {
 210                         /* not likely to carry more ACKs, skip it to simplify logic */
 211                         ksocknal_next_tx_carrier(conn);
 212                 }
 213
 214                 return 1;
 215         }
 216
 217         /* takes two or more cookies already */
 218
 219         if (tx->tx_msg.ksm_zc_cookies[0] > tx->tx_msg.ksm_zc_cookies[1]) {
 220                 __u64   tmp = 0;
 221
 222                 /* two separated cookies: (a+2, a) or (a+1, a) */
 223                 LASSERT (tx->tx_msg.ksm_zc_cookies[0] -
 224                          tx->tx_msg.ksm_zc_cookies[1] <= 2);
 225
 226                 if (tx->tx_msg.ksm_zc_cookies[0] -
 227                     tx->tx_msg.ksm_zc_cookies[1] == 2) {
 228                         if (cookie == tx->tx_msg.ksm_zc_cookies[1] + 1)
 229                                 tmp = cookie;
 230                 } else if (cookie == tx->tx_msg.ksm_zc_cookies[1] - 1) {
 231                         tmp = tx->tx_msg.ksm_zc_cookies[1];
 232                 } else if (cookie == tx->tx_msg.ksm_zc_cookies[0] + 1) {
 233                         tmp = tx->tx_msg.ksm_zc_cookies[0];
 234                 }
 235
 236                 if (tmp != 0) {
 237                         /* range of cookies */
 238                         tx->tx_msg.ksm_zc_cookies[0] = tmp - 1;
 239                         tx->tx_msg.ksm_zc_cookies[1] = tmp + 1;
 240                         return 1;
 241                 }
 242
 243         } else {
 244                 /* ksm_zc_cookies[0] < ksm_zc_cookies[1], it is range of cookies */
 245                 if (cookie >= tx->tx_msg.ksm_zc_cookies[0] &&
 246                     cookie <= tx->tx_msg.ksm_zc_cookies[1]) {
 247                         CWARN("%s: duplicated ZC cookie: "LPU64"\n",
 248                               libcfs_id2str(conn->ksnc_peer->ksnp_id), cookie);
 249                         return 1; /* XXX: return error in the future */
 250                 }
 251
 252                 if (cookie == tx->tx_msg.ksm_zc_cookies[1] + 1) {
 253                         tx->tx_msg.ksm_zc_cookies[1] = cookie;
 254                         return 1;
 255                 }
 256
 257                 if (cookie == tx->tx_msg.ksm_zc_cookies[0] - 1) {
 258                         tx->tx_msg.ksm_zc_cookies[0] = cookie;
 259                         return 1;
 260                 }
 261         }
 262
 263         /* failed to piggyback ZC-ACK */
 264         if (tx_ack != NULL) {
 265                 list_add_tail(&tx_ack->tx_list, &conn->ksnc_tx_queue);
 266                 /* the next tx can piggyback at least 1 ACK */
 267                 ksocknal_next_tx_carrier(conn);
 268         }
 269
 270         return 0;
 271 }
 272
 273 static int
 274 ksocknal_match_tx(ksock_conn_t *conn, ksock_tx_t *tx, int nonblk)
 275 {
 276         int nob;
 277
 278 #if SOCKNAL_VERSION_DEBUG
 279         if (!*ksocknal_tunables.ksnd_typed_conns)
 280                 return SOCKNAL_MATCH_YES;
 281 #endif
 282
 283         if (tx == NULL || tx->tx_lnetmsg == NULL) {
 284                 /* noop packet */
 285                 nob = offsetof(ksock_msg_t, ksm_u);
 286         } else {
 287                 nob = tx->tx_lnetmsg->msg_len +
 288                       ((conn->ksnc_proto == &ksocknal_protocol_v1x) ?
 289                        sizeof(lnet_hdr_t) : sizeof(ksock_msg_t));
 290         }
 291
 292         /* default checking for typed connection */
 293         switch (conn->ksnc_type) {
 294         default:
 295                 CERROR("ksnc_type bad: %u\n", conn->ksnc_type);
 296                 LBUG();
 297         case SOCKLND_CONN_ANY:
 298                 return SOCKNAL_MATCH_YES;
 299
 300         case SOCKLND_CONN_BULK_IN:
 301                 return SOCKNAL_MATCH_MAY;
 302
 303         case SOCKLND_CONN_BULK_OUT:
 304                 if (nob < *ksocknal_tunables.ksnd_min_bulk)
 305                         return SOCKNAL_MATCH_MAY;
 306                 else
 307                         return SOCKNAL_MATCH_YES;
 308
 309         case SOCKLND_CONN_CONTROL:
 310                 if (nob >= *ksocknal_tunables.ksnd_min_bulk)
 311                         return SOCKNAL_MATCH_MAY;
 312                 else
 313                         return SOCKNAL_MATCH_YES;
 314         }
 315 }
 316
 317 static int
 318 ksocknal_match_tx_v3(ksock_conn_t *conn, ksock_tx_t *tx, int nonblk)
 319 {
 320         int nob;
 321
 322         if (tx == NULL || tx->tx_lnetmsg == NULL)
 323                 nob = offsetof(ksock_msg_t, ksm_u);
 324         else
 325                 nob = tx->tx_lnetmsg->msg_len + sizeof(ksock_msg_t);
 326
 327         switch (conn->ksnc_type) {
 328         default:
 329                 CERROR("ksnc_type bad: %u\n", conn->ksnc_type);
 330                 LBUG();
 331         case SOCKLND_CONN_ANY:
 332                 return SOCKNAL_MATCH_NO;
 333
 334         case SOCKLND_CONN_ACK:
 335                 if (nonblk)
 336                         return SOCKNAL_MATCH_YES;
 337                 else if (tx == NULL || tx->tx_lnetmsg == NULL)
 338                         return SOCKNAL_MATCH_MAY;
 339                 else
 340                         return SOCKNAL_MATCH_NO;
 341
 342         case SOCKLND_CONN_BULK_OUT:
 343                 if (nonblk)
 344                         return SOCKNAL_MATCH_NO;
 345                 else if (nob < *ksocknal_tunables.ksnd_min_bulk)
 346                         return SOCKNAL_MATCH_MAY;
 347                 else
 348                         return SOCKNAL_MATCH_YES;
 349
 350         case SOCKLND_CONN_CONTROL:
 351                 if (nonblk)
 352                         return SOCKNAL_MATCH_NO;
 353                 else if (nob >= *ksocknal_tunables.ksnd_min_bulk)
 354                         return SOCKNAL_MATCH_MAY;
 355                 else
 356                         return SOCKNAL_MATCH_YES;
 357         }
 358 }
 359
 360 /* (Sink) handle incoming ZC request from sender */
 361 static int
 362 ksocknal_handle_zcreq(ksock_conn_t *c, __u64 cookie, int remote)
 363 {
 364         ksock_peer_t   *peer = c->ksnc_peer;
 365         ksock_conn_t   *conn;
 366         ksock_tx_t     *tx;
 367         int          rc;
 368
 369         read_lock(&ksocknal_data.ksnd_global_lock);
 370
 371         conn = ksocknal_find_conn_locked(peer, NULL, !!remote);
 372         if (conn != NULL) {
 373                 ksock_sched_t *sched = conn->ksnc_scheduler;
 374
 375                 LASSERT(conn->ksnc_proto->pro_queue_tx_zcack != NULL);
 376
 377                 spin_lock_bh(&sched->kss_lock);
 378
 379                 rc = conn->ksnc_proto->pro_queue_tx_zcack(conn, NULL, cookie);
 380
 381                 spin_unlock_bh(&sched->kss_lock);
 382
 383                 if (rc) { /* piggybacked */
 384                         read_unlock(&ksocknal_data.ksnd_global_lock);
 385                         return 0;
 386                 }
 387         }
 388
 389         read_unlock(&ksocknal_data.ksnd_global_lock);
 390
 391         /* ACK connection is not ready, or can't piggyback the ACK */
 392         tx = ksocknal_alloc_tx_noop(cookie, !!remote);
 393         if (tx == NULL)
 394                 return -ENOMEM;
 395
 396         rc = ksocknal_launch_packet(peer->ksnp_ni, tx, peer->ksnp_id);
 397         if (rc == 0)
 398                 return 0;
 399
 400         ksocknal_free_tx(tx);
 401         return rc;
 402 }
 403
 404 /* (Sender) handle ZC_ACK from sink */
 405 static int
 406 ksocknal_handle_zcack(ksock_conn_t *conn, __u64 cookie1, __u64 cookie2)
 407 {
 408         ksock_peer_t      *peer = conn->ksnc_peer;
 409         ksock_tx_t      *tx;
 410         ksock_tx_t      *tmp;
 411         LIST_HEAD     (zlist);
 412         int             count;
 413
 414         if (cookie1 == 0)
 415                 cookie1 = cookie2;
 416
 417         count = (cookie1 > cookie2) ? 2 : (cookie2 - cookie1 + 1);
 418
 419         if (cookie2 == SOCKNAL_KEEPALIVE_PING &&
 420             conn->ksnc_proto == &ksocknal_protocol_v3x) {
 421                 /* keepalive PING for V3.x, just ignore it */
 422                 return count == 1 ? 0 : -EPROTO;
 423         }
 424
 425         spin_lock(&peer->ksnp_lock);
 426
 427         list_for_each_entry_safe(tx, tmp,
 428                                      &peer->ksnp_zc_req_list, tx_zc_list) {
 429                 __u64 c = tx->tx_msg.ksm_zc_cookies[0];
 430
 431                 if (c == cookie1 || c == cookie2 || (cookie1 < c && c < cookie2)) {
 432                         tx->tx_msg.ksm_zc_cookies[0] = 0;
 433                         list_del(&tx->tx_zc_list);
 434                         list_add(&tx->tx_zc_list, &zlist);
 435
 436                         if (--count == 0)
 437                                 break;
 438                 }
 439         }
 440
 441         spin_unlock(&peer->ksnp_lock);
 442
 443         while (!list_empty(&zlist)) {
 444                 tx = list_entry(zlist.next, ksock_tx_t, tx_zc_list);
 445                 list_del(&tx->tx_zc_list);
 446                 ksocknal_tx_decref(tx);
 447         }
 448
 449         return count == 0 ? 0 : -EPROTO;
 450 }
 451
 452 static int
 453 ksocknal_send_hello_v1 (ksock_conn_t *conn, ksock_hello_msg_t *hello)
 454 {
 455         socket_t        *sock = conn->ksnc_sock;
 456         lnet_hdr_t        *hdr;
 457         lnet_magicversion_t *hmv;
 458         int               rc;
 459         int               i;
 460
 461         CLASSERT(sizeof(lnet_magicversion_t) == offsetof(lnet_hdr_t, src_nid));
 462
 463         LIBCFS_ALLOC(hdr, sizeof(*hdr));
 464         if (hdr == NULL) {
 465                 CERROR("Can't allocate lnet_hdr_t\n");
 466                 return -ENOMEM;
 467         }
 468
 469         hmv = (lnet_magicversion_t *)&hdr->dest_nid;
 470
 471         /* Re-organize V2.x message header to V1.x (lnet_hdr_t)
 472          * header and send out */
 473         hmv->magic       = cpu_to_le32 (LNET_PROTO_TCP_MAGIC);
 474         hmv->version_major = cpu_to_le16 (KSOCK_PROTO_V1_MAJOR);
 475         hmv->version_minor = cpu_to_le16 (KSOCK_PROTO_V1_MINOR);
 476
 477         if (the_lnet.ln_testprotocompat != 0) {
 478                 /* single-shot proto check */
 479                 LNET_LOCK();
 480                 if ((the_lnet.ln_testprotocompat & 1) != 0) {
 481                         hmv->version_major++;   /* just different! */
 482                         the_lnet.ln_testprotocompat &= ~1;
 483                 }
 484                 if ((the_lnet.ln_testprotocompat & 2) != 0) {
 485                         hmv->magic = LNET_PROTO_MAGIC;
 486                         the_lnet.ln_testprotocompat &= ~2;
 487                 }
 488                 LNET_UNLOCK();
 489         }
 490
 491         hdr->src_nid    = cpu_to_le64 (hello->kshm_src_nid);
 492         hdr->src_pid    = cpu_to_le32 (hello->kshm_src_pid);
 493         hdr->type          = cpu_to_le32 (LNET_MSG_HELLO);
 494         hdr->payload_length = cpu_to_le32 (hello->kshm_nips * sizeof(__u32));
 495         hdr->msg.hello.type = cpu_to_le32 (hello->kshm_ctype);
 496         hdr->msg.hello.incarnation = cpu_to_le64 (hello->kshm_src_incarnation);
 497
 498         rc = libcfs_sock_write(sock, hdr, sizeof(*hdr),lnet_acceptor_timeout());
 499
 500         if (rc != 0) {
 501                 CNETERR("Error %d sending HELLO hdr to %pI4h/%d\n",
 502                         rc, &conn->ksnc_ipaddr, conn->ksnc_port);
 503                 goto out;
 504         }
 505
 506         if (hello->kshm_nips == 0)
 507                 goto out;
 508
 509         for (i = 0; i < (int) hello->kshm_nips; i++) {
 510                 hello->kshm_ips[i] = __cpu_to_le32 (hello->kshm_ips[i]);
 511         }
 512
 513         rc = libcfs_sock_write(sock, hello->kshm_ips,
 514                                hello->kshm_nips * sizeof(__u32),
 515                                lnet_acceptor_timeout());
 516         if (rc != 0) {
 517                 CNETERR("Error %d sending HELLO payload (%d)"
 518                         " to %pI4h/%d\n", rc, hello->kshm_nips,
 519                         &conn->ksnc_ipaddr, conn->ksnc_port);
 520         }
 521 out:
 522         LIBCFS_FREE(hdr, sizeof(*hdr));
 523
 524         return rc;
 525 }
 526
 527 static int
 528 ksocknal_send_hello_v2 (ksock_conn_t *conn, ksock_hello_msg_t *hello)
 529 {
 530         socket_t   *sock = conn->ksnc_sock;
 531         int          rc;
 532
 533         hello->kshm_magic   = LNET_PROTO_MAGIC;
 534         hello->kshm_version = conn->ksnc_proto->pro_version;
 535
 536         if (the_lnet.ln_testprotocompat != 0) {
 537                 /* single-shot proto check */
 538                 LNET_LOCK();
 539                 if ((the_lnet.ln_testprotocompat & 1) != 0) {
 540                         hello->kshm_version++;   /* just different! */
 541                         the_lnet.ln_testprotocompat &= ~1;
 542                 }
 543                 LNET_UNLOCK();
 544         }
 545
 546         rc = libcfs_sock_write(sock, hello, offsetof(ksock_hello_msg_t, kshm_ips),
 547                                lnet_acceptor_timeout());
 548
 549         if (rc != 0) {
 550                 CNETERR("Error %d sending HELLO hdr to %pI4h/%d\n",
 551                         rc, &conn->ksnc_ipaddr, conn->ksnc_port);
 552                 return rc;
 553         }
 554
 555         if (hello->kshm_nips == 0)
 556                 return 0;
 557
 558         rc = libcfs_sock_write(sock, hello->kshm_ips,
 559                                hello->kshm_nips * sizeof(__u32),
 560                                lnet_acceptor_timeout());
 561         if (rc != 0) {
 562                 CNETERR("Error %d sending HELLO payload (%d)"
 563                         " to %pI4h/%d\n", rc, hello->kshm_nips,
 564                         &conn->ksnc_ipaddr, conn->ksnc_port);
 565         }
 566
 567         return rc;
 568 }
 569
 570 static int
 571 ksocknal_recv_hello_v1(ksock_conn_t *conn, ksock_hello_msg_t *hello,int timeout)
 572 {
 573         socket_t        *sock = conn->ksnc_sock;
 574         lnet_hdr_t        *hdr;
 575         int               rc;
 576         int               i;
 577
 578         LIBCFS_ALLOC(hdr, sizeof(*hdr));
 579         if (hdr == NULL) {
 580                 CERROR("Can't allocate lnet_hdr_t\n");
 581                 return -ENOMEM;
 582         }
 583
 584         rc = libcfs_sock_read(sock, &hdr->src_nid,
 585                               sizeof (*hdr) - offsetof (lnet_hdr_t, src_nid),
 586                               timeout);
 587         if (rc != 0) {
 588                 CERROR("Error %d reading rest of HELLO hdr from %pI4h\n",
 589                         rc, &conn->ksnc_ipaddr);
 590                 LASSERT (rc < 0 && rc != -EALREADY);
 591                 goto out;
 592         }
 593
 594         /* ...and check we got what we expected */
 595         if (hdr->type != cpu_to_le32 (LNET_MSG_HELLO)) {
 596                 CERROR("Expecting a HELLO hdr,"
 597                         " but got type %d from %pI4h\n",
 598                         le32_to_cpu (hdr->type),
 599                         &conn->ksnc_ipaddr);
 600                 rc = -EPROTO;
 601                 goto out;
 602         }
 603
 604         hello->kshm_src_nid      = le64_to_cpu (hdr->src_nid);
 605         hello->kshm_src_pid      = le32_to_cpu (hdr->src_pid);
 606         hello->kshm_src_incarnation = le64_to_cpu (hdr->msg.hello.incarnation);
 607         hello->kshm_ctype          = le32_to_cpu (hdr->msg.hello.type);
 608         hello->kshm_nips            = le32_to_cpu (hdr->payload_length) /
 609                                          sizeof (__u32);
 610
 611         if (hello->kshm_nips > LNET_MAX_INTERFACES) {
 612                 CERROR("Bad nips %d from ip %pI4h\n",
 613                        hello->kshm_nips, &conn->ksnc_ipaddr);
 614                 rc = -EPROTO;
 615                 goto out;
 616         }
 617
 618         if (hello->kshm_nips == 0)
 619                 goto out;
 620
 621         rc = libcfs_sock_read(sock, hello->kshm_ips,
 622                               hello->kshm_nips * sizeof(__u32), timeout);
 623         if (rc != 0) {
 624                 CERROR("Error %d reading IPs from ip %pI4h\n",
 625                         rc, &conn->ksnc_ipaddr);
 626                 LASSERT(rc < 0 && rc != -EALREADY);
 627                 goto out;
 628         }
 629
 630         for (i = 0; i < (int) hello->kshm_nips; i++) {
 631                 hello->kshm_ips[i] = __le32_to_cpu(hello->kshm_ips[i]);
 632
 633                 if (hello->kshm_ips[i] == 0) {
 634                         CERROR("Zero IP[%d] from ip %pI4h\n",
 635                                i, &conn->ksnc_ipaddr);
 636                         rc = -EPROTO;
 637                         break;
 638                 }
 639         }
 640 out:
 641         LIBCFS_FREE(hdr, sizeof(*hdr));
 642
 643         return rc;
 644 }
 645
 646 static int
 647 ksocknal_recv_hello_v2 (ksock_conn_t *conn, ksock_hello_msg_t *hello, int timeout)
 648 {
 649         socket_t      *sock = conn->ksnc_sock;
 650         int             rc;
 651         int             i;
 652
 653         if (hello->kshm_magic == LNET_PROTO_MAGIC)
 654                 conn->ksnc_flip = 0;
 655         else
 656                 conn->ksnc_flip = 1;
 657
 658         rc = libcfs_sock_read(sock, &hello->kshm_src_nid,
 659                               offsetof(ksock_hello_msg_t, kshm_ips) -
 660                                        offsetof(ksock_hello_msg_t, kshm_src_nid),
 661                               timeout);
 662         if (rc != 0) {
 663                 CERROR("Error %d reading HELLO from %pI4h\n",
 664                         rc, &conn->ksnc_ipaddr);
 665                 LASSERT(rc < 0 && rc != -EALREADY);
 666                 return rc;
 667         }
 668
 669         if (conn->ksnc_flip) {
 670                 __swab32s(&hello->kshm_src_pid);
 671                 __swab64s(&hello->kshm_src_nid);
 672                 __swab32s(&hello->kshm_dst_pid);
 673                 __swab64s(&hello->kshm_dst_nid);
 674                 __swab64s(&hello->kshm_src_incarnation);
 675                 __swab64s(&hello->kshm_dst_incarnation);
 676                 __swab32s(&hello->kshm_ctype);
 677                 __swab32s(&hello->kshm_nips);
 678         }
 679
 680         if (hello->kshm_nips > LNET_MAX_INTERFACES) {
 681                 CERROR("Bad nips %d from ip %pI4h\n",
 682                        hello->kshm_nips, &conn->ksnc_ipaddr);
 683                 return -EPROTO;
 684         }
 685
 686         if (hello->kshm_nips == 0)
 687                 return 0;
 688
 689         rc = libcfs_sock_read(sock, hello->kshm_ips,
 690                               hello->kshm_nips * sizeof(__u32), timeout);
 691         if (rc != 0) {
 692                 CERROR("Error %d reading IPs from ip %pI4h\n",
 693                         rc, &conn->ksnc_ipaddr);
 694                 LASSERT(rc < 0 && rc != -EALREADY);
 695                 return rc;
 696         }
 697
 698         for (i = 0; i < (int) hello->kshm_nips; i++) {
 699                 if (conn->ksnc_flip)
 700                         __swab32s(&hello->kshm_ips[i]);
 701
 702                 if (hello->kshm_ips[i] == 0) {
 703                         CERROR("Zero IP[%d] from ip %pI4h\n",
 704                                i, &conn->ksnc_ipaddr);
 705                         return -EPROTO;
 706                 }
 707         }
 708
 709         return 0;
 710 }
 711
 712 static void
 713 ksocknal_pack_msg_v1(ksock_tx_t *tx)
 714 {
 715         /* V1.x has no KSOCK_MSG_NOOP */
 716         LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
 717         LASSERT(tx->tx_lnetmsg != NULL);
 718
 719         tx->tx_iov[0].iov_base = (void *)&tx->tx_lnetmsg->msg_hdr;
 720         tx->tx_iov[0].iov_len  = sizeof(lnet_hdr_t);
 721
 722         tx->tx_resid = tx->tx_nob = tx->tx_lnetmsg->msg_len + sizeof(lnet_hdr_t);
 723 }
 724
 725 static void
 726 ksocknal_pack_msg_v2(ksock_tx_t *tx)
 727 {
 728         tx->tx_iov[0].iov_base = (void *)&tx->tx_msg;
 729
 730         if (tx->tx_lnetmsg != NULL) {
 731                 LASSERT(tx->tx_msg.ksm_type != KSOCK_MSG_NOOP);
 732
 733                 tx->tx_msg.ksm_u.lnetmsg.ksnm_hdr = tx->tx_lnetmsg->msg_hdr;
 734                 tx->tx_iov[0].iov_len = sizeof(ksock_msg_t);
 735                 tx->tx_resid = tx->tx_nob = sizeof(ksock_msg_t) + tx->tx_lnetmsg->msg_len;
 736         } else {
 737                 LASSERT(tx->tx_msg.ksm_type == KSOCK_MSG_NOOP);
 738
 739                 tx->tx_iov[0].iov_len = offsetof(ksock_msg_t, ksm_u.lnetmsg.ksnm_hdr);
 740                 tx->tx_resid = tx->tx_nob = offsetof(ksock_msg_t,  ksm_u.lnetmsg.ksnm_hdr);
 741         }
 742         /* Don't checksum before start sending, because packet can be piggybacked with ACK */
 743 }
 744
 745 static void
 746 ksocknal_unpack_msg_v1(ksock_msg_t *msg)
 747 {
 748         msg->ksm_csum      = 0;
 749         msg->ksm_type      = KSOCK_MSG_LNET;
 750         msg->ksm_zc_cookies[0]  = msg->ksm_zc_cookies[1]  = 0;
 751 }
 752
 753 static void
 754 ksocknal_unpack_msg_v2(ksock_msg_t *msg)
 755 {
 756         return;  /* Do nothing */
 757 }
 758
 759 ksock_proto_t  ksocknal_protocol_v1x =
 760 {
 761         .pro_version        = KSOCK_PROTO_V1,
 762         .pro_send_hello  = ksocknal_send_hello_v1,
 763         .pro_recv_hello  = ksocknal_recv_hello_v1,
 764         .pro_pack              = ksocknal_pack_msg_v1,
 765         .pro_unpack          = ksocknal_unpack_msg_v1,
 766         .pro_queue_tx_msg       = ksocknal_queue_tx_msg_v1,
 767         .pro_handle_zcreq       = NULL,
 768         .pro_handle_zcack       = NULL,
 769         .pro_queue_tx_zcack     = NULL,
 770         .pro_match_tx      = ksocknal_match_tx
 771 };
 772
 773 ksock_proto_t  ksocknal_protocol_v2x =
 774 {
 775         .pro_version        = KSOCK_PROTO_V2,
 776         .pro_send_hello  = ksocknal_send_hello_v2,
 777         .pro_recv_hello  = ksocknal_recv_hello_v2,
 778         .pro_pack              = ksocknal_pack_msg_v2,
 779         .pro_unpack          = ksocknal_unpack_msg_v2,
 780         .pro_queue_tx_msg       = ksocknal_queue_tx_msg_v2,
 781         .pro_queue_tx_zcack     = ksocknal_queue_tx_zcack_v2,
 782         .pro_handle_zcreq       = ksocknal_handle_zcreq,
 783         .pro_handle_zcack       = ksocknal_handle_zcack,
 784         .pro_match_tx      = ksocknal_match_tx
 785 };
 786
 787 ksock_proto_t  ksocknal_protocol_v3x =
 788 {
 789         .pro_version        = KSOCK_PROTO_V3,
 790         .pro_send_hello  = ksocknal_send_hello_v2,
 791         .pro_recv_hello  = ksocknal_recv_hello_v2,
 792         .pro_pack              = ksocknal_pack_msg_v2,
 793         .pro_unpack          = ksocknal_unpack_msg_v2,
 794         .pro_queue_tx_msg       = ksocknal_queue_tx_msg_v2,
 795         .pro_queue_tx_zcack     = ksocknal_queue_tx_zcack_v3,
 796         .pro_handle_zcreq       = ksocknal_handle_zcreq,
 797         .pro_handle_zcack       = ksocknal_handle_zcack,
 798         .pro_match_tx      = ksocknal_match_tx_v3
 799 };