1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * CLC (connection layer control) handshake over initial TCP socket to 6 * prepare for RDMA traffic 7 * 8 * Copyright IBM Corp. 2016, 2018 9 * 10 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 11 */ 12 13 #include <linux/in.h> 14 #include <linux/inetdevice.h> 15 #include <linux/if_ether.h> 16 #include <linux/sched/signal.h> 17 18 #include <net/addrconf.h> 19 #include <net/sock.h> 20 #include <net/tcp.h> 21 22 #include "smc.h" 23 #include "smc_core.h" 24 #include "smc_clc.h" 25 #include "smc_ib.h" 26 #include "smc_ism.h" 27 28 #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68 29 #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48 30 31 /* eye catcher "SMCR" EBCDIC for CLC messages */ 32 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; 33 /* eye catcher "SMCD" EBCDIC for CLC messages */ 34 static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'}; 35 36 /* check if received message has a correct header length and contains valid 37 * heading and trailing eyecatchers 38 */ 39 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm) 40 { 41 struct smc_clc_msg_proposal_prefix *pclc_prfx; 42 struct smc_clc_msg_accept_confirm *clc; 43 struct smc_clc_msg_proposal *pclc; 44 struct smc_clc_msg_decline *dclc; 45 struct smc_clc_msg_trail *trl; 46 47 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 48 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 49 return false; 50 switch (clcm->type) { 51 case SMC_CLC_PROPOSAL: 52 if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D && 53 clcm->path != SMC_TYPE_B) 54 return false; 55 pclc = (struct smc_clc_msg_proposal *)clcm; 56 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 57 if (ntohs(pclc->hdr.length) != 58 sizeof(*pclc) + ntohs(pclc->iparea_offset) + 59 sizeof(*pclc_prfx) + 60 pclc_prfx->ipv6_prefixes_cnt * 61 sizeof(struct smc_clc_ipv6_prefix) + 62 sizeof(*trl)) 63 return false; 64 trl = (struct smc_clc_msg_trail *) 65 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); 66 break; 67 case SMC_CLC_ACCEPT: 68 case SMC_CLC_CONFIRM: 69 if (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D) 70 return false; 71 clc = (struct smc_clc_msg_accept_confirm *)clcm; 72 if ((clcm->path == SMC_TYPE_R && 73 ntohs(clc->hdr.length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) || 74 (clcm->path == SMC_TYPE_D && 75 ntohs(clc->hdr.length) != SMCD_CLC_ACCEPT_CONFIRM_LEN)) 76 return false; 77 trl = (struct smc_clc_msg_trail *) 78 ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl)); 79 break; 80 case SMC_CLC_DECLINE: 81 dclc = (struct smc_clc_msg_decline *)clcm; 82 if (ntohs(dclc->hdr.length) != sizeof(*dclc)) 83 return false; 84 trl = &dclc->trl; 85 break; 86 default: 87 return false; 88 } 89 if (memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 90 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 91 return false; 92 return true; 93 } 94 95 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ 96 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, 97 struct smc_clc_msg_proposal_prefix *prop) 98 { 99 struct in_device *in_dev = __in_dev_get_rcu(dst->dev); 100 const struct in_ifaddr *ifa; 101 102 if (!in_dev) 103 return -ENODEV; 104 105 in_dev_for_each_ifa_rcu(ifa, in_dev) { 106 if (!inet_ifa_match(ipv4, ifa)) 107 continue; 108 prop->prefix_len = inet_mask_len(ifa->ifa_mask); 109 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; 110 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ 111 return 0; 112 } 113 return -ENOENT; 114 } 115 116 /* fill CLC proposal msg with ipv6 prefixes from device */ 117 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, 118 struct smc_clc_msg_proposal_prefix *prop, 119 struct smc_clc_ipv6_prefix *ipv6_prfx) 120 { 121 #if IS_ENABLED(CONFIG_IPV6) 122 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); 123 struct inet6_ifaddr *ifa; 124 int cnt = 0; 125 126 if (!in6_dev) 127 return -ENODEV; 128 /* use a maximum of 8 IPv6 prefixes from device */ 129 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 130 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 131 continue; 132 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, 133 &ifa->addr, ifa->prefix_len); 134 ipv6_prfx[cnt].prefix_len = ifa->prefix_len; 135 cnt++; 136 if (cnt == SMC_CLC_MAX_V6_PREFIX) 137 break; 138 } 139 prop->ipv6_prefixes_cnt = cnt; 140 if (cnt) 141 return 0; 142 #endif 143 return -ENOENT; 144 } 145 146 /* retrieve and set prefixes in CLC proposal msg */ 147 static int smc_clc_prfx_set(struct socket *clcsock, 148 struct smc_clc_msg_proposal_prefix *prop, 149 struct smc_clc_ipv6_prefix *ipv6_prfx) 150 { 151 struct dst_entry *dst = sk_dst_get(clcsock->sk); 152 struct sockaddr_storage addrs; 153 struct sockaddr_in6 *addr6; 154 struct sockaddr_in *addr; 155 int rc = -ENOENT; 156 157 memset(prop, 0, sizeof(*prop)); 158 if (!dst) { 159 rc = -ENOTCONN; 160 goto out; 161 } 162 if (!dst->dev) { 163 rc = -ENODEV; 164 goto out_rel; 165 } 166 /* get address to which the internal TCP socket is bound */ 167 kernel_getsockname(clcsock, (struct sockaddr *)&addrs); 168 /* analyze IP specific data of net_device belonging to TCP socket */ 169 addr6 = (struct sockaddr_in6 *)&addrs; 170 rcu_read_lock(); 171 if (addrs.ss_family == PF_INET) { 172 /* IPv4 */ 173 addr = (struct sockaddr_in *)&addrs; 174 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); 175 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { 176 /* mapped IPv4 address - peer is IPv4 only */ 177 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], 178 prop); 179 } else { 180 /* IPv6 */ 181 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); 182 } 183 rcu_read_unlock(); 184 out_rel: 185 dst_release(dst); 186 out: 187 return rc; 188 } 189 190 /* match ipv4 addrs of dev against addr in CLC proposal */ 191 static int smc_clc_prfx_match4_rcu(struct net_device *dev, 192 struct smc_clc_msg_proposal_prefix *prop) 193 { 194 struct in_device *in_dev = __in_dev_get_rcu(dev); 195 const struct in_ifaddr *ifa; 196 197 if (!in_dev) 198 return -ENODEV; 199 in_dev_for_each_ifa_rcu(ifa, in_dev) { 200 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && 201 inet_ifa_match(prop->outgoing_subnet, ifa)) 202 return 0; 203 } 204 205 return -ENOENT; 206 } 207 208 /* match ipv6 addrs of dev against addrs in CLC proposal */ 209 static int smc_clc_prfx_match6_rcu(struct net_device *dev, 210 struct smc_clc_msg_proposal_prefix *prop) 211 { 212 #if IS_ENABLED(CONFIG_IPV6) 213 struct inet6_dev *in6_dev = __in6_dev_get(dev); 214 struct smc_clc_ipv6_prefix *ipv6_prfx; 215 struct inet6_ifaddr *ifa; 216 int i, max; 217 218 if (!in6_dev) 219 return -ENODEV; 220 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ 221 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); 222 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); 223 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 224 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 225 continue; 226 for (i = 0; i < max; i++) { 227 if (ifa->prefix_len == ipv6_prfx[i].prefix_len && 228 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, 229 ifa->prefix_len)) 230 return 0; 231 } 232 } 233 #endif 234 return -ENOENT; 235 } 236 237 /* check if proposed prefixes match one of our device prefixes */ 238 int smc_clc_prfx_match(struct socket *clcsock, 239 struct smc_clc_msg_proposal_prefix *prop) 240 { 241 struct dst_entry *dst = sk_dst_get(clcsock->sk); 242 int rc; 243 244 if (!dst) { 245 rc = -ENOTCONN; 246 goto out; 247 } 248 if (!dst->dev) { 249 rc = -ENODEV; 250 goto out_rel; 251 } 252 rcu_read_lock(); 253 if (!prop->ipv6_prefixes_cnt) 254 rc = smc_clc_prfx_match4_rcu(dst->dev, prop); 255 else 256 rc = smc_clc_prfx_match6_rcu(dst->dev, prop); 257 rcu_read_unlock(); 258 out_rel: 259 dst_release(dst); 260 out: 261 return rc; 262 } 263 264 /* Wait for data on the tcp-socket, analyze received data 265 * Returns: 266 * 0 if success and it was not a decline that we received. 267 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. 268 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. 269 */ 270 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 271 u8 expected_type, unsigned long timeout) 272 { 273 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo; 274 struct sock *clc_sk = smc->clcsock->sk; 275 struct smc_clc_msg_hdr *clcm = buf; 276 struct msghdr msg = {NULL, 0}; 277 int reason_code = 0; 278 struct kvec vec = {buf, buflen}; 279 int len, datlen; 280 int krflags; 281 282 /* peek the first few bytes to determine length of data to receive 283 * so we don't consume any subsequent CLC message or payload data 284 * in the TCP byte stream 285 */ 286 /* 287 * Caller must make sure that buflen is no less than 288 * sizeof(struct smc_clc_msg_hdr) 289 */ 290 krflags = MSG_PEEK | MSG_WAITALL; 291 clc_sk->sk_rcvtimeo = timeout; 292 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, 293 sizeof(struct smc_clc_msg_hdr)); 294 len = sock_recvmsg(smc->clcsock, &msg, krflags); 295 if (signal_pending(current)) { 296 reason_code = -EINTR; 297 clc_sk->sk_err = EINTR; 298 smc->sk.sk_err = EINTR; 299 goto out; 300 } 301 if (clc_sk->sk_err) { 302 reason_code = -clc_sk->sk_err; 303 if (clc_sk->sk_err == EAGAIN && 304 expected_type == SMC_CLC_DECLINE) 305 clc_sk->sk_err = 0; /* reset for fallback usage */ 306 else 307 smc->sk.sk_err = clc_sk->sk_err; 308 goto out; 309 } 310 if (!len) { /* peer has performed orderly shutdown */ 311 smc->sk.sk_err = ECONNRESET; 312 reason_code = -ECONNRESET; 313 goto out; 314 } 315 if (len < 0) { 316 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) 317 smc->sk.sk_err = -len; 318 reason_code = len; 319 goto out; 320 } 321 datlen = ntohs(clcm->length); 322 if ((len < sizeof(struct smc_clc_msg_hdr)) || 323 (datlen > buflen) || 324 (clcm->version != SMC_CLC_V1) || 325 (clcm->path != SMC_TYPE_R && clcm->path != SMC_TYPE_D && 326 clcm->path != SMC_TYPE_B) || 327 ((clcm->type != SMC_CLC_DECLINE) && 328 (clcm->type != expected_type))) { 329 smc->sk.sk_err = EPROTO; 330 reason_code = -EPROTO; 331 goto out; 332 } 333 334 /* receive the complete CLC message */ 335 memset(&msg, 0, sizeof(struct msghdr)); 336 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, datlen); 337 krflags = MSG_WAITALL; 338 len = sock_recvmsg(smc->clcsock, &msg, krflags); 339 if (len < datlen || !smc_clc_msg_hdr_valid(clcm)) { 340 smc->sk.sk_err = EPROTO; 341 reason_code = -EPROTO; 342 goto out; 343 } 344 if (clcm->type == SMC_CLC_DECLINE) { 345 struct smc_clc_msg_decline *dclc; 346 347 dclc = (struct smc_clc_msg_decline *)clcm; 348 reason_code = SMC_CLC_DECL_PEERDECL; 349 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); 350 if (((struct smc_clc_msg_decline *)buf)->hdr.flag) { 351 smc->conn.lgr->sync_err = 1; 352 smc_lgr_terminate(smc->conn.lgr, true); 353 } 354 } 355 356 out: 357 clc_sk->sk_rcvtimeo = rcvtimeo; 358 return reason_code; 359 } 360 361 /* send CLC DECLINE message across internal TCP socket */ 362 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info) 363 { 364 struct smc_clc_msg_decline dclc; 365 struct msghdr msg; 366 struct kvec vec; 367 int len; 368 369 memset(&dclc, 0, sizeof(dclc)); 370 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 371 dclc.hdr.type = SMC_CLC_DECLINE; 372 dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline)); 373 dclc.hdr.version = SMC_CLC_V1; 374 dclc.hdr.flag = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 1 : 0; 375 memcpy(dclc.id_for_peer, local_systemid, sizeof(local_systemid)); 376 dclc.peer_diagnosis = htonl(peer_diag_info); 377 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 378 379 memset(&msg, 0, sizeof(msg)); 380 vec.iov_base = &dclc; 381 vec.iov_len = sizeof(struct smc_clc_msg_decline); 382 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, 383 sizeof(struct smc_clc_msg_decline)); 384 if (len < 0 || len < sizeof(struct smc_clc_msg_decline)) 385 len = -EPROTO; 386 return len > 0 ? 0 : len; 387 } 388 389 /* send CLC PROPOSAL message across internal TCP socket */ 390 int smc_clc_send_proposal(struct smc_sock *smc, int smc_type, 391 struct smc_init_info *ini) 392 { 393 struct smc_clc_ipv6_prefix ipv6_prfx[SMC_CLC_MAX_V6_PREFIX]; 394 struct smc_clc_msg_proposal_prefix pclc_prfx; 395 struct smc_clc_msg_smcd pclc_smcd; 396 struct smc_clc_msg_proposal pclc; 397 struct smc_clc_msg_trail trl; 398 int len, i, plen, rc; 399 int reason_code = 0; 400 struct kvec vec[5]; 401 struct msghdr msg; 402 403 /* retrieve ip prefixes for CLC proposal msg */ 404 rc = smc_clc_prfx_set(smc->clcsock, &pclc_prfx, ipv6_prfx); 405 if (rc) 406 return SMC_CLC_DECL_CNFERR; /* configuration error */ 407 408 /* send SMC Proposal CLC message */ 409 plen = sizeof(pclc) + sizeof(pclc_prfx) + 410 (pclc_prfx.ipv6_prefixes_cnt * sizeof(ipv6_prfx[0])) + 411 sizeof(trl); 412 memset(&pclc, 0, sizeof(pclc)); 413 memcpy(pclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 414 pclc.hdr.type = SMC_CLC_PROPOSAL; 415 pclc.hdr.version = SMC_CLC_V1; /* SMC version */ 416 pclc.hdr.path = smc_type; 417 if (smc_type == SMC_TYPE_R || smc_type == SMC_TYPE_B) { 418 /* add SMC-R specifics */ 419 memcpy(pclc.lcl.id_for_peer, local_systemid, 420 sizeof(local_systemid)); 421 memcpy(&pclc.lcl.gid, ini->ib_gid, SMC_GID_SIZE); 422 memcpy(&pclc.lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], 423 ETH_ALEN); 424 pclc.iparea_offset = htons(0); 425 } 426 if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) { 427 /* add SMC-D specifics */ 428 memset(&pclc_smcd, 0, sizeof(pclc_smcd)); 429 plen += sizeof(pclc_smcd); 430 pclc.iparea_offset = htons(SMC_CLC_PROPOSAL_MAX_OFFSET); 431 pclc_smcd.gid = ini->ism_dev->local_gid; 432 } 433 pclc.hdr.length = htons(plen); 434 435 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 436 memset(&msg, 0, sizeof(msg)); 437 i = 0; 438 vec[i].iov_base = &pclc; 439 vec[i++].iov_len = sizeof(pclc); 440 if (smc_type == SMC_TYPE_D || smc_type == SMC_TYPE_B) { 441 vec[i].iov_base = &pclc_smcd; 442 vec[i++].iov_len = sizeof(pclc_smcd); 443 } 444 vec[i].iov_base = &pclc_prfx; 445 vec[i++].iov_len = sizeof(pclc_prfx); 446 if (pclc_prfx.ipv6_prefixes_cnt > 0) { 447 vec[i].iov_base = &ipv6_prfx[0]; 448 vec[i++].iov_len = pclc_prfx.ipv6_prefixes_cnt * 449 sizeof(ipv6_prfx[0]); 450 } 451 vec[i].iov_base = &trl; 452 vec[i++].iov_len = sizeof(trl); 453 /* due to the few bytes needed for clc-handshake this cannot block */ 454 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); 455 if (len < 0) { 456 smc->sk.sk_err = smc->clcsock->sk->sk_err; 457 reason_code = -smc->sk.sk_err; 458 } else if (len < (int)sizeof(pclc)) { 459 reason_code = -ENETUNREACH; 460 smc->sk.sk_err = -reason_code; 461 } 462 463 return reason_code; 464 } 465 466 /* send CLC CONFIRM message across internal TCP socket */ 467 int smc_clc_send_confirm(struct smc_sock *smc) 468 { 469 struct smc_connection *conn = &smc->conn; 470 struct smc_clc_msg_accept_confirm cclc; 471 struct smc_link *link; 472 int reason_code = 0; 473 struct msghdr msg; 474 struct kvec vec; 475 int len; 476 477 /* send SMC Confirm CLC msg */ 478 memset(&cclc, 0, sizeof(cclc)); 479 cclc.hdr.type = SMC_CLC_CONFIRM; 480 cclc.hdr.version = SMC_CLC_V1; /* SMC version */ 481 if (smc->conn.lgr->is_smcd) { 482 /* SMC-D specific settings */ 483 memcpy(cclc.hdr.eyecatcher, SMCD_EYECATCHER, 484 sizeof(SMCD_EYECATCHER)); 485 cclc.hdr.path = SMC_TYPE_D; 486 cclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 487 cclc.gid = conn->lgr->smcd->local_gid; 488 cclc.token = conn->rmb_desc->token; 489 cclc.dmbe_size = conn->rmbe_size_short; 490 cclc.dmbe_idx = 0; 491 memcpy(&cclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 492 memcpy(cclc.smcd_trl.eyecatcher, SMCD_EYECATCHER, 493 sizeof(SMCD_EYECATCHER)); 494 } else { 495 /* SMC-R specific settings */ 496 link = &conn->lgr->lnk[SMC_SINGLE_LINK]; 497 memcpy(cclc.hdr.eyecatcher, SMC_EYECATCHER, 498 sizeof(SMC_EYECATCHER)); 499 cclc.hdr.path = SMC_TYPE_R; 500 cclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 501 memcpy(cclc.lcl.id_for_peer, local_systemid, 502 sizeof(local_systemid)); 503 memcpy(&cclc.lcl.gid, link->gid, SMC_GID_SIZE); 504 memcpy(&cclc.lcl.mac, &link->smcibdev->mac[link->ibport - 1], 505 ETH_ALEN); 506 hton24(cclc.qpn, link->roce_qp->qp_num); 507 cclc.rmb_rkey = 508 htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey); 509 cclc.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ 510 cclc.rmbe_alert_token = htonl(conn->alert_token_local); 511 cclc.qp_mtu = min(link->path_mtu, link->peer_mtu); 512 cclc.rmbe_size = conn->rmbe_size_short; 513 cclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address 514 (conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl)); 515 hton24(cclc.psn, link->psn_initial); 516 memcpy(cclc.smcr_trl.eyecatcher, SMC_EYECATCHER, 517 sizeof(SMC_EYECATCHER)); 518 } 519 520 memset(&msg, 0, sizeof(msg)); 521 vec.iov_base = &cclc; 522 vec.iov_len = ntohs(cclc.hdr.length); 523 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, 524 ntohs(cclc.hdr.length)); 525 if (len < ntohs(cclc.hdr.length)) { 526 if (len >= 0) { 527 reason_code = -ENETUNREACH; 528 smc->sk.sk_err = -reason_code; 529 } else { 530 smc->sk.sk_err = smc->clcsock->sk->sk_err; 531 reason_code = -smc->sk.sk_err; 532 } 533 } 534 return reason_code; 535 } 536 537 /* send CLC ACCEPT message across internal TCP socket */ 538 int smc_clc_send_accept(struct smc_sock *new_smc, int srv_first_contact) 539 { 540 struct smc_connection *conn = &new_smc->conn; 541 struct smc_clc_msg_accept_confirm aclc; 542 struct smc_link *link; 543 struct msghdr msg; 544 struct kvec vec; 545 int len; 546 547 memset(&aclc, 0, sizeof(aclc)); 548 aclc.hdr.type = SMC_CLC_ACCEPT; 549 aclc.hdr.version = SMC_CLC_V1; /* SMC version */ 550 if (srv_first_contact) 551 aclc.hdr.flag = 1; 552 553 if (new_smc->conn.lgr->is_smcd) { 554 /* SMC-D specific settings */ 555 aclc.hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 556 memcpy(aclc.hdr.eyecatcher, SMCD_EYECATCHER, 557 sizeof(SMCD_EYECATCHER)); 558 aclc.hdr.path = SMC_TYPE_D; 559 aclc.gid = conn->lgr->smcd->local_gid; 560 aclc.token = conn->rmb_desc->token; 561 aclc.dmbe_size = conn->rmbe_size_short; 562 aclc.dmbe_idx = 0; 563 memcpy(&aclc.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 564 memcpy(aclc.smcd_trl.eyecatcher, SMCD_EYECATCHER, 565 sizeof(SMCD_EYECATCHER)); 566 } else { 567 /* SMC-R specific settings */ 568 aclc.hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 569 memcpy(aclc.hdr.eyecatcher, SMC_EYECATCHER, 570 sizeof(SMC_EYECATCHER)); 571 aclc.hdr.path = SMC_TYPE_R; 572 link = &conn->lgr->lnk[SMC_SINGLE_LINK]; 573 memcpy(aclc.lcl.id_for_peer, local_systemid, 574 sizeof(local_systemid)); 575 memcpy(&aclc.lcl.gid, link->gid, SMC_GID_SIZE); 576 memcpy(&aclc.lcl.mac, link->smcibdev->mac[link->ibport - 1], 577 ETH_ALEN); 578 hton24(aclc.qpn, link->roce_qp->qp_num); 579 aclc.rmb_rkey = 580 htonl(conn->rmb_desc->mr_rx[SMC_SINGLE_LINK]->rkey); 581 aclc.rmbe_idx = 1; /* as long as 1 RMB = 1 RMBE */ 582 aclc.rmbe_alert_token = htonl(conn->alert_token_local); 583 aclc.qp_mtu = link->path_mtu; 584 aclc.rmbe_size = conn->rmbe_size_short, 585 aclc.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address 586 (conn->rmb_desc->sgt[SMC_SINGLE_LINK].sgl)); 587 hton24(aclc.psn, link->psn_initial); 588 memcpy(aclc.smcr_trl.eyecatcher, SMC_EYECATCHER, 589 sizeof(SMC_EYECATCHER)); 590 } 591 592 memset(&msg, 0, sizeof(msg)); 593 vec.iov_base = &aclc; 594 vec.iov_len = ntohs(aclc.hdr.length); 595 len = kernel_sendmsg(new_smc->clcsock, &msg, &vec, 1, 596 ntohs(aclc.hdr.length)); 597 if (len < ntohs(aclc.hdr.length)) 598 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; 599 600 return len > 0 ? 0 : len; 601 } 602