1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Basic Transport Functions exploiting Infiniband API 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 12 #include <linux/socket.h> 13 #include <linux/if_vlan.h> 14 #include <linux/random.h> 15 #include <linux/workqueue.h> 16 #include <linux/wait.h> 17 #include <linux/reboot.h> 18 #include <linux/mutex.h> 19 #include <linux/list.h> 20 #include <linux/smc.h> 21 #include <net/tcp.h> 22 #include <net/sock.h> 23 #include <rdma/ib_verbs.h> 24 #include <rdma/ib_cache.h> 25 26 #include "smc.h" 27 #include "smc_clc.h" 28 #include "smc_core.h" 29 #include "smc_ib.h" 30 #include "smc_wr.h" 31 #include "smc_llc.h" 32 #include "smc_cdc.h" 33 #include "smc_close.h" 34 #include "smc_ism.h" 35 #include "smc_netlink.h" 36 #include "smc_stats.h" 37 #include "smc_tracepoint.h" 38 39 #define SMC_LGR_NUM_INCR 256 40 #define SMC_LGR_FREE_DELAY_SERV (600 * HZ) 41 #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ) 42 43 struct smc_lgr_list smc_lgr_list = { /* established link groups */ 44 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), 45 .list = LIST_HEAD_INIT(smc_lgr_list.list), 46 .num = 0, 47 }; 48 49 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */ 50 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted); 51 52 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 53 struct smc_buf_desc *buf_desc); 54 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft); 55 56 static void smc_link_down_work(struct work_struct *work); 57 58 /* return head of link group list and its lock for a given link group */ 59 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr, 60 spinlock_t **lgr_lock) 61 { 62 if (lgr->is_smcd) { 63 *lgr_lock = &lgr->smcd->lgr_lock; 64 return &lgr->smcd->lgr_list; 65 } 66 67 *lgr_lock = &smc_lgr_list.lock; 68 return &smc_lgr_list.list; 69 } 70 71 static void smc_ibdev_cnt_inc(struct smc_link *lnk) 72 { 73 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]); 74 } 75 76 static void smc_ibdev_cnt_dec(struct smc_link *lnk) 77 { 78 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]); 79 } 80 81 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr) 82 { 83 /* client link group creation always follows the server link group 84 * creation. For client use a somewhat higher removal delay time, 85 * otherwise there is a risk of out-of-sync link groups. 86 */ 87 if (!lgr->freeing) { 88 mod_delayed_work(system_wq, &lgr->free_work, 89 (!lgr->is_smcd && lgr->role == SMC_CLNT) ? 90 SMC_LGR_FREE_DELAY_CLNT : 91 SMC_LGR_FREE_DELAY_SERV); 92 } 93 } 94 95 /* Register connection's alert token in our lookup structure. 96 * To use rbtrees we have to implement our own insert core. 97 * Requires @conns_lock 98 * @smc connection to register 99 * Returns 0 on success, != otherwise. 100 */ 101 static void smc_lgr_add_alert_token(struct smc_connection *conn) 102 { 103 struct rb_node **link, *parent = NULL; 104 u32 token = conn->alert_token_local; 105 106 link = &conn->lgr->conns_all.rb_node; 107 while (*link) { 108 struct smc_connection *cur = rb_entry(*link, 109 struct smc_connection, alert_node); 110 111 parent = *link; 112 if (cur->alert_token_local > token) 113 link = &parent->rb_left; 114 else 115 link = &parent->rb_right; 116 } 117 /* Put the new node there */ 118 rb_link_node(&conn->alert_node, parent, link); 119 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); 120 } 121 122 /* assign an SMC-R link to the connection */ 123 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first) 124 { 125 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING : 126 SMC_LNK_ACTIVE; 127 int i, j; 128 129 /* do link balancing */ 130 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 131 struct smc_link *lnk = &conn->lgr->lnk[i]; 132 133 if (lnk->state != expected || lnk->link_is_asym) 134 continue; 135 if (conn->lgr->role == SMC_CLNT) { 136 conn->lnk = lnk; /* temporary, SMC server assigns link*/ 137 break; 138 } 139 if (conn->lgr->conns_num % 2) { 140 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) { 141 struct smc_link *lnk2; 142 143 lnk2 = &conn->lgr->lnk[j]; 144 if (lnk2->state == expected && 145 !lnk2->link_is_asym) { 146 conn->lnk = lnk2; 147 break; 148 } 149 } 150 } 151 if (!conn->lnk) 152 conn->lnk = lnk; 153 break; 154 } 155 if (!conn->lnk) 156 return SMC_CLC_DECL_NOACTLINK; 157 atomic_inc(&conn->lnk->conn_cnt); 158 return 0; 159 } 160 161 /* Register connection in link group by assigning an alert token 162 * registered in a search tree. 163 * Requires @conns_lock 164 * Note that '0' is a reserved value and not assigned. 165 */ 166 static int smc_lgr_register_conn(struct smc_connection *conn, bool first) 167 { 168 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 169 static atomic_t nexttoken = ATOMIC_INIT(0); 170 int rc; 171 172 if (!conn->lgr->is_smcd) { 173 rc = smcr_lgr_conn_assign_link(conn, first); 174 if (rc) { 175 conn->lgr = NULL; 176 return rc; 177 } 178 } 179 /* find a new alert_token_local value not yet used by some connection 180 * in this link group 181 */ 182 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ 183 while (!conn->alert_token_local) { 184 conn->alert_token_local = atomic_inc_return(&nexttoken); 185 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) 186 conn->alert_token_local = 0; 187 } 188 smc_lgr_add_alert_token(conn); 189 conn->lgr->conns_num++; 190 return 0; 191 } 192 193 /* Unregister connection and reset the alert token of the given connection< 194 */ 195 static void __smc_lgr_unregister_conn(struct smc_connection *conn) 196 { 197 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 198 struct smc_link_group *lgr = conn->lgr; 199 200 rb_erase(&conn->alert_node, &lgr->conns_all); 201 if (conn->lnk) 202 atomic_dec(&conn->lnk->conn_cnt); 203 lgr->conns_num--; 204 conn->alert_token_local = 0; 205 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ 206 } 207 208 /* Unregister connection from lgr 209 */ 210 static void smc_lgr_unregister_conn(struct smc_connection *conn) 211 { 212 struct smc_link_group *lgr = conn->lgr; 213 214 if (!smc_conn_lgr_valid(conn)) 215 return; 216 write_lock_bh(&lgr->conns_lock); 217 if (conn->alert_token_local) { 218 __smc_lgr_unregister_conn(conn); 219 } 220 write_unlock_bh(&lgr->conns_lock); 221 } 222 223 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb) 224 { 225 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 226 char hostname[SMC_MAX_HOSTNAME_LEN + 1]; 227 char smc_seid[SMC_MAX_EID_LEN + 1]; 228 struct nlattr *attrs; 229 u8 *seid = NULL; 230 u8 *host = NULL; 231 void *nlh; 232 233 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 234 &smc_gen_nl_family, NLM_F_MULTI, 235 SMC_NETLINK_GET_SYS_INFO); 236 if (!nlh) 237 goto errmsg; 238 if (cb_ctx->pos[0]) 239 goto errout; 240 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO); 241 if (!attrs) 242 goto errout; 243 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2)) 244 goto errattr; 245 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE)) 246 goto errattr; 247 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable())) 248 goto errattr; 249 if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true)) 250 goto errattr; 251 smc_clc_get_hostname(&host); 252 if (host) { 253 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN); 254 hostname[SMC_MAX_HOSTNAME_LEN] = 0; 255 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname)) 256 goto errattr; 257 } 258 if (smc_ism_is_v2_capable()) { 259 smc_ism_get_system_eid(&seid); 260 memcpy(smc_seid, seid, SMC_MAX_EID_LEN); 261 smc_seid[SMC_MAX_EID_LEN] = 0; 262 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid)) 263 goto errattr; 264 } 265 nla_nest_end(skb, attrs); 266 genlmsg_end(skb, nlh); 267 cb_ctx->pos[0] = 1; 268 return skb->len; 269 270 errattr: 271 nla_nest_cancel(skb, attrs); 272 errout: 273 genlmsg_cancel(skb, nlh); 274 errmsg: 275 return skb->len; 276 } 277 278 /* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */ 279 static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr, 280 struct sk_buff *skb, 281 struct netlink_callback *cb, 282 struct nlattr *v2_attrs) 283 { 284 char smc_host[SMC_MAX_HOSTNAME_LEN + 1]; 285 char smc_eid[SMC_MAX_EID_LEN + 1]; 286 287 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version)) 288 goto errv2attr; 289 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release)) 290 goto errv2attr; 291 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os)) 292 goto errv2attr; 293 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN); 294 smc_host[SMC_MAX_HOSTNAME_LEN] = 0; 295 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host)) 296 goto errv2attr; 297 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN); 298 smc_eid[SMC_MAX_EID_LEN] = 0; 299 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid)) 300 goto errv2attr; 301 302 nla_nest_end(skb, v2_attrs); 303 return 0; 304 305 errv2attr: 306 nla_nest_cancel(skb, v2_attrs); 307 return -EMSGSIZE; 308 } 309 310 static int smc_nl_fill_smcr_lgr_v2(struct smc_link_group *lgr, 311 struct sk_buff *skb, 312 struct netlink_callback *cb) 313 { 314 struct nlattr *v2_attrs; 315 316 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2); 317 if (!v2_attrs) 318 goto errattr; 319 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_DIRECT, !lgr->uses_gateway)) 320 goto errv2attr; 321 322 nla_nest_end(skb, v2_attrs); 323 return 0; 324 325 errv2attr: 326 nla_nest_cancel(skb, v2_attrs); 327 errattr: 328 return -EMSGSIZE; 329 } 330 331 static int smc_nl_fill_lgr(struct smc_link_group *lgr, 332 struct sk_buff *skb, 333 struct netlink_callback *cb) 334 { 335 char smc_target[SMC_MAX_PNETID_LEN + 1]; 336 struct nlattr *attrs, *v2_attrs; 337 338 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR); 339 if (!attrs) 340 goto errout; 341 342 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id))) 343 goto errattr; 344 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num)) 345 goto errattr; 346 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role)) 347 goto errattr; 348 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type)) 349 goto errattr; 350 if (nla_put_u8(skb, SMC_NLA_LGR_R_BUF_TYPE, lgr->buf_type)) 351 goto errattr; 352 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id)) 353 goto errattr; 354 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE, 355 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD)) 356 goto errattr; 357 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN); 358 smc_target[SMC_MAX_PNETID_LEN] = 0; 359 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target)) 360 goto errattr; 361 if (lgr->smc_version > SMC_V1) { 362 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON); 363 if (!v2_attrs) 364 goto errattr; 365 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 366 goto errattr; 367 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb)) 368 goto errattr; 369 } 370 371 nla_nest_end(skb, attrs); 372 return 0; 373 errattr: 374 nla_nest_cancel(skb, attrs); 375 errout: 376 return -EMSGSIZE; 377 } 378 379 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr, 380 struct smc_link *link, 381 struct sk_buff *skb, 382 struct netlink_callback *cb) 383 { 384 char smc_ibname[IB_DEVICE_NAME_MAX]; 385 u8 smc_gid_target[41]; 386 struct nlattr *attrs; 387 u32 link_uid = 0; 388 void *nlh; 389 390 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 391 &smc_gen_nl_family, NLM_F_MULTI, 392 SMC_NETLINK_GET_LINK_SMCR); 393 if (!nlh) 394 goto errmsg; 395 396 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR); 397 if (!attrs) 398 goto errout; 399 400 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id)) 401 goto errattr; 402 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state)) 403 goto errattr; 404 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT, 405 atomic_read(&link->conn_cnt))) 406 goto errattr; 407 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport)) 408 goto errattr; 409 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx)) 410 goto errattr; 411 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname); 412 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname)) 413 goto errattr; 414 memcpy(&link_uid, link->link_uid, sizeof(link_uid)); 415 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid)) 416 goto errattr; 417 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid)); 418 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid)) 419 goto errattr; 420 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 421 smc_gid_be16_convert(smc_gid_target, link->gid); 422 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target)) 423 goto errattr; 424 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 425 smc_gid_be16_convert(smc_gid_target, link->peer_gid); 426 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target)) 427 goto errattr; 428 429 nla_nest_end(skb, attrs); 430 genlmsg_end(skb, nlh); 431 return 0; 432 errattr: 433 nla_nest_cancel(skb, attrs); 434 errout: 435 genlmsg_cancel(skb, nlh); 436 errmsg: 437 return -EMSGSIZE; 438 } 439 440 static int smc_nl_handle_lgr(struct smc_link_group *lgr, 441 struct sk_buff *skb, 442 struct netlink_callback *cb, 443 bool list_links) 444 { 445 void *nlh; 446 int i; 447 448 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 449 &smc_gen_nl_family, NLM_F_MULTI, 450 SMC_NETLINK_GET_LGR_SMCR); 451 if (!nlh) 452 goto errmsg; 453 if (smc_nl_fill_lgr(lgr, skb, cb)) 454 goto errout; 455 456 genlmsg_end(skb, nlh); 457 if (!list_links) 458 goto out; 459 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 460 if (!smc_link_usable(&lgr->lnk[i])) 461 continue; 462 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb)) 463 goto errout; 464 } 465 out: 466 return 0; 467 468 errout: 469 genlmsg_cancel(skb, nlh); 470 errmsg: 471 return -EMSGSIZE; 472 } 473 474 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr, 475 struct sk_buff *skb, 476 struct netlink_callback *cb, 477 bool list_links) 478 { 479 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 480 struct smc_link_group *lgr; 481 int snum = cb_ctx->pos[0]; 482 int num = 0; 483 484 spin_lock_bh(&smc_lgr->lock); 485 list_for_each_entry(lgr, &smc_lgr->list, list) { 486 if (num < snum) 487 goto next; 488 if (smc_nl_handle_lgr(lgr, skb, cb, list_links)) 489 goto errout; 490 next: 491 num++; 492 } 493 errout: 494 spin_unlock_bh(&smc_lgr->lock); 495 cb_ctx->pos[0] = num; 496 } 497 498 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr, 499 struct sk_buff *skb, 500 struct netlink_callback *cb) 501 { 502 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 503 struct nlattr *attrs; 504 void *nlh; 505 506 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 507 &smc_gen_nl_family, NLM_F_MULTI, 508 SMC_NETLINK_GET_LGR_SMCD); 509 if (!nlh) 510 goto errmsg; 511 512 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD); 513 if (!attrs) 514 goto errout; 515 516 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id))) 517 goto errattr; 518 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid, 519 SMC_NLA_LGR_D_PAD)) 520 goto errattr; 521 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid, 522 SMC_NLA_LGR_D_PAD)) 523 goto errattr; 524 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id)) 525 goto errattr; 526 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num)) 527 goto errattr; 528 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd))) 529 goto errattr; 530 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN); 531 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 532 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet)) 533 goto errattr; 534 if (lgr->smc_version > SMC_V1) { 535 struct nlattr *v2_attrs; 536 537 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON); 538 if (!v2_attrs) 539 goto errattr; 540 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 541 goto errattr; 542 } 543 nla_nest_end(skb, attrs); 544 genlmsg_end(skb, nlh); 545 return 0; 546 547 errattr: 548 nla_nest_cancel(skb, attrs); 549 errout: 550 genlmsg_cancel(skb, nlh); 551 errmsg: 552 return -EMSGSIZE; 553 } 554 555 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev, 556 struct sk_buff *skb, 557 struct netlink_callback *cb) 558 { 559 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 560 struct smc_link_group *lgr; 561 int snum = cb_ctx->pos[1]; 562 int rc = 0, num = 0; 563 564 spin_lock_bh(&dev->lgr_lock); 565 list_for_each_entry(lgr, &dev->lgr_list, list) { 566 if (!lgr->is_smcd) 567 continue; 568 if (num < snum) 569 goto next; 570 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb); 571 if (rc) 572 goto errout; 573 next: 574 num++; 575 } 576 errout: 577 spin_unlock_bh(&dev->lgr_lock); 578 cb_ctx->pos[1] = num; 579 return rc; 580 } 581 582 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list, 583 struct sk_buff *skb, 584 struct netlink_callback *cb) 585 { 586 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 587 struct smcd_dev *smcd_dev; 588 int snum = cb_ctx->pos[0]; 589 int rc = 0, num = 0; 590 591 mutex_lock(&dev_list->mutex); 592 list_for_each_entry(smcd_dev, &dev_list->list, list) { 593 if (list_empty(&smcd_dev->lgr_list)) 594 continue; 595 if (num < snum) 596 goto next; 597 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb); 598 if (rc) 599 goto errout; 600 next: 601 num++; 602 } 603 errout: 604 mutex_unlock(&dev_list->mutex); 605 cb_ctx->pos[0] = num; 606 return rc; 607 } 608 609 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 610 { 611 bool list_links = false; 612 613 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 614 return skb->len; 615 } 616 617 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb) 618 { 619 bool list_links = true; 620 621 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 622 return skb->len; 623 } 624 625 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 626 { 627 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb); 628 return skb->len; 629 } 630 631 void smc_lgr_cleanup_early(struct smc_link_group *lgr) 632 { 633 spinlock_t *lgr_lock; 634 635 if (!lgr) 636 return; 637 638 smc_lgr_list_head(lgr, &lgr_lock); 639 spin_lock_bh(lgr_lock); 640 /* do not use this link group for new connections */ 641 if (!list_empty(&lgr->list)) 642 list_del_init(&lgr->list); 643 spin_unlock_bh(lgr_lock); 644 __smc_lgr_terminate(lgr, true); 645 } 646 647 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 648 { 649 int i; 650 651 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 652 struct smc_link *lnk = &lgr->lnk[i]; 653 654 if (smc_link_sendable(lnk)) 655 lnk->state = SMC_LNK_INACTIVE; 656 } 657 wake_up_all(&lgr->llc_msg_waiter); 658 wake_up_all(&lgr->llc_flow_waiter); 659 } 660 661 static void smc_lgr_free(struct smc_link_group *lgr); 662 663 static void smc_lgr_free_work(struct work_struct *work) 664 { 665 struct smc_link_group *lgr = container_of(to_delayed_work(work), 666 struct smc_link_group, 667 free_work); 668 spinlock_t *lgr_lock; 669 bool conns; 670 671 smc_lgr_list_head(lgr, &lgr_lock); 672 spin_lock_bh(lgr_lock); 673 if (lgr->freeing) { 674 spin_unlock_bh(lgr_lock); 675 return; 676 } 677 read_lock_bh(&lgr->conns_lock); 678 conns = RB_EMPTY_ROOT(&lgr->conns_all); 679 read_unlock_bh(&lgr->conns_lock); 680 if (!conns) { /* number of lgr connections is no longer zero */ 681 spin_unlock_bh(lgr_lock); 682 return; 683 } 684 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 685 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 686 spin_unlock_bh(lgr_lock); 687 cancel_delayed_work(&lgr->free_work); 688 689 if (!lgr->is_smcd && !lgr->terminating) 690 smc_llc_send_link_delete_all(lgr, true, 691 SMC_LLC_DEL_PROG_INIT_TERM); 692 if (lgr->is_smcd && !lgr->terminating) 693 smc_ism_signal_shutdown(lgr); 694 if (!lgr->is_smcd) 695 smcr_lgr_link_deactivate_all(lgr); 696 smc_lgr_free(lgr); 697 } 698 699 static void smc_lgr_terminate_work(struct work_struct *work) 700 { 701 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 702 terminate_work); 703 704 __smc_lgr_terminate(lgr, true); 705 } 706 707 /* return next unique link id for the lgr */ 708 static u8 smcr_next_link_id(struct smc_link_group *lgr) 709 { 710 u8 link_id; 711 int i; 712 713 while (1) { 714 again: 715 link_id = ++lgr->next_link_id; 716 if (!link_id) /* skip zero as link_id */ 717 link_id = ++lgr->next_link_id; 718 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 719 if (smc_link_usable(&lgr->lnk[i]) && 720 lgr->lnk[i].link_id == link_id) 721 goto again; 722 } 723 break; 724 } 725 return link_id; 726 } 727 728 static void smcr_copy_dev_info_to_link(struct smc_link *link) 729 { 730 struct smc_ib_device *smcibdev = link->smcibdev; 731 732 snprintf(link->ibname, sizeof(link->ibname), "%s", 733 smcibdev->ibdev->name); 734 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; 735 } 736 737 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 738 u8 link_idx, struct smc_init_info *ini) 739 { 740 struct smc_ib_device *smcibdev; 741 u8 rndvec[3]; 742 int rc; 743 744 if (lgr->smc_version == SMC_V2) { 745 lnk->smcibdev = ini->smcrv2.ib_dev_v2; 746 lnk->ibport = ini->smcrv2.ib_port_v2; 747 } else { 748 lnk->smcibdev = ini->ib_dev; 749 lnk->ibport = ini->ib_port; 750 } 751 get_device(&lnk->smcibdev->ibdev->dev); 752 atomic_inc(&lnk->smcibdev->lnk_cnt); 753 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 754 lnk->clearing = 0; 755 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 756 lnk->link_id = smcr_next_link_id(lgr); 757 lnk->lgr = lgr; 758 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 759 lnk->link_idx = link_idx; 760 smc_ibdev_cnt_inc(lnk); 761 smcr_copy_dev_info_to_link(lnk); 762 atomic_set(&lnk->conn_cnt, 0); 763 smc_llc_link_set_uid(lnk); 764 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 765 if (!lnk->smcibdev->initialized) { 766 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 767 if (rc) 768 goto out; 769 } 770 get_random_bytes(rndvec, sizeof(rndvec)); 771 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 772 (rndvec[2] << 16); 773 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 774 ini->vlan_id, lnk->gid, &lnk->sgid_index, 775 lgr->smc_version == SMC_V2 ? 776 &ini->smcrv2 : NULL); 777 if (rc) 778 goto out; 779 rc = smc_llc_link_init(lnk); 780 if (rc) 781 goto out; 782 rc = smc_wr_alloc_link_mem(lnk); 783 if (rc) 784 goto clear_llc_lnk; 785 rc = smc_ib_create_protection_domain(lnk); 786 if (rc) 787 goto free_link_mem; 788 rc = smc_ib_create_queue_pair(lnk); 789 if (rc) 790 goto dealloc_pd; 791 rc = smc_wr_create_link(lnk); 792 if (rc) 793 goto destroy_qp; 794 lnk->state = SMC_LNK_ACTIVATING; 795 return 0; 796 797 destroy_qp: 798 smc_ib_destroy_queue_pair(lnk); 799 dealloc_pd: 800 smc_ib_dealloc_protection_domain(lnk); 801 free_link_mem: 802 smc_wr_free_link_mem(lnk); 803 clear_llc_lnk: 804 smc_llc_link_clear(lnk, false); 805 out: 806 smc_ibdev_cnt_dec(lnk); 807 put_device(&lnk->smcibdev->ibdev->dev); 808 smcibdev = lnk->smcibdev; 809 memset(lnk, 0, sizeof(struct smc_link)); 810 lnk->state = SMC_LNK_UNUSED; 811 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 812 wake_up(&smcibdev->lnks_deleted); 813 smc_lgr_put(lgr); /* lgr_hold above */ 814 return rc; 815 } 816 817 /* create a new SMC link group */ 818 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 819 { 820 struct smc_link_group *lgr; 821 struct list_head *lgr_list; 822 struct smc_link *lnk; 823 spinlock_t *lgr_lock; 824 u8 link_idx; 825 int rc = 0; 826 int i; 827 828 if (ini->is_smcd && ini->vlan_id) { 829 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 830 ini->vlan_id)) { 831 rc = SMC_CLC_DECL_ISMVLANERR; 832 goto out; 833 } 834 } 835 836 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 837 if (!lgr) { 838 rc = SMC_CLC_DECL_MEM; 839 goto ism_put_vlan; 840 } 841 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 842 SMC_LGR_ID_SIZE, &lgr->id); 843 if (!lgr->tx_wq) { 844 rc = -ENOMEM; 845 goto free_lgr; 846 } 847 lgr->is_smcd = ini->is_smcd; 848 lgr->sync_err = 0; 849 lgr->terminating = 0; 850 lgr->freeing = 0; 851 lgr->vlan_id = ini->vlan_id; 852 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 853 mutex_init(&lgr->sndbufs_lock); 854 mutex_init(&lgr->rmbs_lock); 855 rwlock_init(&lgr->conns_lock); 856 for (i = 0; i < SMC_RMBE_SIZES; i++) { 857 INIT_LIST_HEAD(&lgr->sndbufs[i]); 858 INIT_LIST_HEAD(&lgr->rmbs[i]); 859 } 860 lgr->next_link_id = 0; 861 smc_lgr_list.num += SMC_LGR_NUM_INCR; 862 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 863 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 864 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 865 lgr->conns_all = RB_ROOT; 866 if (ini->is_smcd) { 867 /* SMC-D specific settings */ 868 get_device(&ini->ism_dev[ini->ism_selected]->dev); 869 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected]; 870 lgr->smcd = ini->ism_dev[ini->ism_selected]; 871 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 872 lgr_lock = &lgr->smcd->lgr_lock; 873 lgr->smc_version = ini->smcd_version; 874 lgr->peer_shutdown = 0; 875 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 876 } else { 877 /* SMC-R specific settings */ 878 struct smc_ib_device *ibdev; 879 int ibport; 880 881 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 882 lgr->smc_version = ini->smcr_version; 883 memcpy(lgr->peer_systemid, ini->peer_systemid, 884 SMC_SYSTEMID_LEN); 885 if (lgr->smc_version == SMC_V2) { 886 ibdev = ini->smcrv2.ib_dev_v2; 887 ibport = ini->smcrv2.ib_port_v2; 888 lgr->saddr = ini->smcrv2.saddr; 889 lgr->uses_gateway = ini->smcrv2.uses_gateway; 890 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 891 ETH_ALEN); 892 } else { 893 ibdev = ini->ib_dev; 894 ibport = ini->ib_port; 895 } 896 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 897 SMC_MAX_PNETID_LEN); 898 if (smc_wr_alloc_lgr_mem(lgr)) 899 goto free_wq; 900 smc_llc_lgr_init(lgr, smc); 901 902 link_idx = SMC_SINGLE_LINK; 903 lnk = &lgr->lnk[link_idx]; 904 rc = smcr_link_init(lgr, lnk, link_idx, ini); 905 if (rc) { 906 smc_wr_free_lgr_mem(lgr); 907 goto free_wq; 908 } 909 lgr->net = smc_ib_net(lnk->smcibdev); 910 lgr_list = &smc_lgr_list.list; 911 lgr_lock = &smc_lgr_list.lock; 912 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 913 atomic_inc(&lgr_cnt); 914 } 915 smc->conn.lgr = lgr; 916 spin_lock_bh(lgr_lock); 917 list_add_tail(&lgr->list, lgr_list); 918 spin_unlock_bh(lgr_lock); 919 return 0; 920 921 free_wq: 922 destroy_workqueue(lgr->tx_wq); 923 free_lgr: 924 kfree(lgr); 925 ism_put_vlan: 926 if (ini->is_smcd && ini->vlan_id) 927 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 928 out: 929 if (rc < 0) { 930 if (rc == -ENOMEM) 931 rc = SMC_CLC_DECL_MEM; 932 else 933 rc = SMC_CLC_DECL_INTERR; 934 } 935 return rc; 936 } 937 938 static int smc_write_space(struct smc_connection *conn) 939 { 940 int buffer_len = conn->peer_rmbe_size; 941 union smc_host_cursor prod; 942 union smc_host_cursor cons; 943 int space; 944 945 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 946 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 947 /* determine rx_buf space */ 948 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 949 return space; 950 } 951 952 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 953 struct smc_wr_buf *wr_buf) 954 { 955 struct smc_connection *conn = &smc->conn; 956 union smc_host_cursor cons, fin; 957 int rc = 0; 958 int diff; 959 960 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 961 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 962 /* set prod cursor to old state, enforce tx_rdma_writes() */ 963 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 964 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 965 966 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 967 /* cons cursor advanced more than fin, and prod was set 968 * fin above, so now prod is smaller than cons. Fix that. 969 */ 970 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 971 smc_curs_add(conn->sndbuf_desc->len, 972 &conn->tx_curs_sent, diff); 973 smc_curs_add(conn->sndbuf_desc->len, 974 &conn->tx_curs_fin, diff); 975 976 smp_mb__before_atomic(); 977 atomic_add(diff, &conn->sndbuf_space); 978 smp_mb__after_atomic(); 979 980 smc_curs_add(conn->peer_rmbe_size, 981 &conn->local_tx_ctrl.prod, diff); 982 smc_curs_add(conn->peer_rmbe_size, 983 &conn->local_tx_ctrl_fin, diff); 984 } 985 /* recalculate, value is used by tx_rdma_writes() */ 986 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 987 988 if (smc->sk.sk_state != SMC_INIT && 989 smc->sk.sk_state != SMC_CLOSED) { 990 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 991 if (!rc) { 992 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 993 smc->sk.sk_data_ready(&smc->sk); 994 } 995 } else { 996 smc_wr_tx_put_slot(conn->lnk, 997 (struct smc_wr_tx_pend_priv *)pend); 998 } 999 return rc; 1000 } 1001 1002 void smc_switch_link_and_count(struct smc_connection *conn, 1003 struct smc_link *to_lnk) 1004 { 1005 atomic_dec(&conn->lnk->conn_cnt); 1006 /* link_hold in smc_conn_create() */ 1007 smcr_link_put(conn->lnk); 1008 conn->lnk = to_lnk; 1009 atomic_inc(&conn->lnk->conn_cnt); 1010 /* link_put in smc_conn_free() */ 1011 smcr_link_hold(conn->lnk); 1012 } 1013 1014 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1015 struct smc_link *from_lnk, bool is_dev_err) 1016 { 1017 struct smc_link *to_lnk = NULL; 1018 struct smc_cdc_tx_pend *pend; 1019 struct smc_connection *conn; 1020 struct smc_wr_buf *wr_buf; 1021 struct smc_sock *smc; 1022 struct rb_node *node; 1023 int i, rc = 0; 1024 1025 /* link is inactive, wake up tx waiters */ 1026 smc_wr_wakeup_tx_wait(from_lnk); 1027 1028 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1029 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1030 continue; 1031 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1032 from_lnk->ibport == lgr->lnk[i].ibport) { 1033 continue; 1034 } 1035 to_lnk = &lgr->lnk[i]; 1036 break; 1037 } 1038 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1039 smc_lgr_terminate_sched(lgr); 1040 return NULL; 1041 } 1042 again: 1043 read_lock_bh(&lgr->conns_lock); 1044 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1045 conn = rb_entry(node, struct smc_connection, alert_node); 1046 if (conn->lnk != from_lnk) 1047 continue; 1048 smc = container_of(conn, struct smc_sock, conn); 1049 /* conn->lnk not yet set in SMC_INIT state */ 1050 if (smc->sk.sk_state == SMC_INIT) 1051 continue; 1052 if (smc->sk.sk_state == SMC_CLOSED || 1053 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1054 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1055 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1056 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1057 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1058 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1059 smc->sk.sk_state == SMC_PEERABORTWAIT || 1060 smc->sk.sk_state == SMC_PROCESSABORT) { 1061 spin_lock_bh(&conn->send_lock); 1062 smc_switch_link_and_count(conn, to_lnk); 1063 spin_unlock_bh(&conn->send_lock); 1064 continue; 1065 } 1066 sock_hold(&smc->sk); 1067 read_unlock_bh(&lgr->conns_lock); 1068 /* pre-fetch buffer outside of send_lock, might sleep */ 1069 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1070 if (rc) 1071 goto err_out; 1072 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1073 spin_lock_bh(&conn->send_lock); 1074 smc_switch_link_and_count(conn, to_lnk); 1075 rc = smc_switch_cursor(smc, pend, wr_buf); 1076 spin_unlock_bh(&conn->send_lock); 1077 sock_put(&smc->sk); 1078 if (rc) 1079 goto err_out; 1080 goto again; 1081 } 1082 read_unlock_bh(&lgr->conns_lock); 1083 smc_wr_tx_link_put(to_lnk); 1084 return to_lnk; 1085 1086 err_out: 1087 smcr_link_down_cond_sched(to_lnk); 1088 smc_wr_tx_link_put(to_lnk); 1089 return NULL; 1090 } 1091 1092 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1093 struct smc_link_group *lgr) 1094 { 1095 struct mutex *lock; /* lock buffer list */ 1096 int rc; 1097 1098 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1099 /* unregister rmb with peer */ 1100 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1101 if (!rc) { 1102 /* protect against smc_llc_cli_rkey_exchange() */ 1103 mutex_lock(&lgr->llc_conf_mutex); 1104 smc_llc_do_delete_rkey(lgr, buf_desc); 1105 buf_desc->is_conf_rkey = false; 1106 mutex_unlock(&lgr->llc_conf_mutex); 1107 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1108 } 1109 } 1110 1111 if (buf_desc->is_reg_err) { 1112 /* buf registration failed, reuse not possible */ 1113 lock = is_rmb ? &lgr->rmbs_lock : 1114 &lgr->sndbufs_lock; 1115 mutex_lock(lock); 1116 list_del(&buf_desc->list); 1117 mutex_unlock(lock); 1118 1119 smc_buf_free(lgr, is_rmb, buf_desc); 1120 } else { 1121 buf_desc->used = 0; 1122 memset(buf_desc->cpu_addr, 0, buf_desc->len); 1123 } 1124 } 1125 1126 static void smc_buf_unuse(struct smc_connection *conn, 1127 struct smc_link_group *lgr) 1128 { 1129 if (conn->sndbuf_desc) { 1130 if (!lgr->is_smcd && conn->sndbuf_desc->is_vm) { 1131 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1132 } else { 1133 conn->sndbuf_desc->used = 0; 1134 memset(conn->sndbuf_desc->cpu_addr, 0, 1135 conn->sndbuf_desc->len); 1136 } 1137 } 1138 if (conn->rmb_desc) { 1139 if (!lgr->is_smcd) { 1140 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1141 } else { 1142 conn->rmb_desc->used = 0; 1143 memset(conn->rmb_desc->cpu_addr, 0, 1144 conn->rmb_desc->len + 1145 sizeof(struct smcd_cdc_msg)); 1146 } 1147 } 1148 } 1149 1150 /* remove a finished connection from its link group */ 1151 void smc_conn_free(struct smc_connection *conn) 1152 { 1153 struct smc_link_group *lgr = conn->lgr; 1154 1155 if (!lgr || conn->freed) 1156 /* Connection has never been registered in a 1157 * link group, or has already been freed. 1158 */ 1159 return; 1160 1161 conn->freed = 1; 1162 if (!smc_conn_lgr_valid(conn)) 1163 /* Connection has already unregistered from 1164 * link group. 1165 */ 1166 goto lgr_put; 1167 1168 if (lgr->is_smcd) { 1169 if (!list_empty(&lgr->list)) 1170 smc_ism_unset_conn(conn); 1171 tasklet_kill(&conn->rx_tsklet); 1172 } else { 1173 smc_cdc_wait_pend_tx_wr(conn); 1174 if (current_work() != &conn->abort_work) 1175 cancel_work_sync(&conn->abort_work); 1176 } 1177 if (!list_empty(&lgr->list)) { 1178 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1179 smc_lgr_unregister_conn(conn); 1180 } 1181 1182 if (!lgr->conns_num) 1183 smc_lgr_schedule_free_work(lgr); 1184 lgr_put: 1185 if (!lgr->is_smcd) 1186 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1187 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1188 } 1189 1190 /* unregister a link from a buf_desc */ 1191 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1192 struct smc_link *lnk) 1193 { 1194 if (is_rmb || buf_desc->is_vm) 1195 buf_desc->is_reg_mr[lnk->link_idx] = false; 1196 if (!buf_desc->is_map_ib[lnk->link_idx]) 1197 return; 1198 1199 if ((is_rmb || buf_desc->is_vm) && 1200 buf_desc->mr[lnk->link_idx]) { 1201 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1202 buf_desc->mr[lnk->link_idx] = NULL; 1203 } 1204 if (is_rmb) 1205 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1206 else 1207 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1208 1209 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1210 buf_desc->is_map_ib[lnk->link_idx] = false; 1211 } 1212 1213 /* unmap all buffers of lgr for a deleted link */ 1214 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1215 { 1216 struct smc_link_group *lgr = lnk->lgr; 1217 struct smc_buf_desc *buf_desc, *bf; 1218 int i; 1219 1220 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1221 mutex_lock(&lgr->rmbs_lock); 1222 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1223 smcr_buf_unmap_link(buf_desc, true, lnk); 1224 mutex_unlock(&lgr->rmbs_lock); 1225 mutex_lock(&lgr->sndbufs_lock); 1226 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1227 list) 1228 smcr_buf_unmap_link(buf_desc, false, lnk); 1229 mutex_unlock(&lgr->sndbufs_lock); 1230 } 1231 } 1232 1233 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1234 { 1235 struct smc_link_group *lgr = lnk->lgr; 1236 int i; 1237 1238 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1239 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1240 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1241 } 1242 } 1243 1244 static void __smcr_link_clear(struct smc_link *lnk) 1245 { 1246 struct smc_link_group *lgr = lnk->lgr; 1247 struct smc_ib_device *smcibdev; 1248 1249 smc_wr_free_link_mem(lnk); 1250 smc_ibdev_cnt_dec(lnk); 1251 put_device(&lnk->smcibdev->ibdev->dev); 1252 smcibdev = lnk->smcibdev; 1253 memset(lnk, 0, sizeof(struct smc_link)); 1254 lnk->state = SMC_LNK_UNUSED; 1255 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1256 wake_up(&smcibdev->lnks_deleted); 1257 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1258 } 1259 1260 /* must be called under lgr->llc_conf_mutex lock */ 1261 void smcr_link_clear(struct smc_link *lnk, bool log) 1262 { 1263 if (!lnk->lgr || lnk->clearing || 1264 lnk->state == SMC_LNK_UNUSED) 1265 return; 1266 lnk->clearing = 1; 1267 lnk->peer_qpn = 0; 1268 smc_llc_link_clear(lnk, log); 1269 smcr_buf_unmap_lgr(lnk); 1270 smcr_rtoken_clear_link(lnk); 1271 smc_ib_modify_qp_error(lnk); 1272 smc_wr_free_link(lnk); 1273 smc_ib_destroy_queue_pair(lnk); 1274 smc_ib_dealloc_protection_domain(lnk); 1275 smcr_link_put(lnk); /* theoretically last link_put */ 1276 } 1277 1278 void smcr_link_hold(struct smc_link *lnk) 1279 { 1280 refcount_inc(&lnk->refcnt); 1281 } 1282 1283 void smcr_link_put(struct smc_link *lnk) 1284 { 1285 if (refcount_dec_and_test(&lnk->refcnt)) 1286 __smcr_link_clear(lnk); 1287 } 1288 1289 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1290 struct smc_buf_desc *buf_desc) 1291 { 1292 int i; 1293 1294 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1295 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1296 1297 if (!buf_desc->is_vm && buf_desc->pages) 1298 __free_pages(buf_desc->pages, buf_desc->order); 1299 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1300 vfree(buf_desc->cpu_addr); 1301 kfree(buf_desc); 1302 } 1303 1304 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1305 struct smc_buf_desc *buf_desc) 1306 { 1307 if (is_dmb) { 1308 /* restore original buf len */ 1309 buf_desc->len += sizeof(struct smcd_cdc_msg); 1310 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1311 } else { 1312 kfree(buf_desc->cpu_addr); 1313 } 1314 kfree(buf_desc); 1315 } 1316 1317 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1318 struct smc_buf_desc *buf_desc) 1319 { 1320 if (lgr->is_smcd) 1321 smcd_buf_free(lgr, is_rmb, buf_desc); 1322 else 1323 smcr_buf_free(lgr, is_rmb, buf_desc); 1324 } 1325 1326 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1327 { 1328 struct smc_buf_desc *buf_desc, *bf_desc; 1329 struct list_head *buf_list; 1330 int i; 1331 1332 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1333 if (is_rmb) 1334 buf_list = &lgr->rmbs[i]; 1335 else 1336 buf_list = &lgr->sndbufs[i]; 1337 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1338 list) { 1339 list_del(&buf_desc->list); 1340 smc_buf_free(lgr, is_rmb, buf_desc); 1341 } 1342 } 1343 } 1344 1345 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1346 { 1347 /* free send buffers */ 1348 __smc_lgr_free_bufs(lgr, false); 1349 /* free rmbs */ 1350 __smc_lgr_free_bufs(lgr, true); 1351 } 1352 1353 /* won't be freed until no one accesses to lgr anymore */ 1354 static void __smc_lgr_free(struct smc_link_group *lgr) 1355 { 1356 smc_lgr_free_bufs(lgr); 1357 if (lgr->is_smcd) { 1358 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1359 wake_up(&lgr->smcd->lgrs_deleted); 1360 } else { 1361 smc_wr_free_lgr_mem(lgr); 1362 if (!atomic_dec_return(&lgr_cnt)) 1363 wake_up(&lgrs_deleted); 1364 } 1365 kfree(lgr); 1366 } 1367 1368 /* remove a link group */ 1369 static void smc_lgr_free(struct smc_link_group *lgr) 1370 { 1371 int i; 1372 1373 if (!lgr->is_smcd) { 1374 mutex_lock(&lgr->llc_conf_mutex); 1375 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1376 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1377 smcr_link_clear(&lgr->lnk[i], false); 1378 } 1379 mutex_unlock(&lgr->llc_conf_mutex); 1380 smc_llc_lgr_clear(lgr); 1381 } 1382 1383 destroy_workqueue(lgr->tx_wq); 1384 if (lgr->is_smcd) { 1385 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1386 put_device(&lgr->smcd->dev); 1387 } 1388 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1389 } 1390 1391 void smc_lgr_hold(struct smc_link_group *lgr) 1392 { 1393 refcount_inc(&lgr->refcnt); 1394 } 1395 1396 void smc_lgr_put(struct smc_link_group *lgr) 1397 { 1398 if (refcount_dec_and_test(&lgr->refcnt)) 1399 __smc_lgr_free(lgr); 1400 } 1401 1402 static void smc_sk_wake_ups(struct smc_sock *smc) 1403 { 1404 smc->sk.sk_write_space(&smc->sk); 1405 smc->sk.sk_data_ready(&smc->sk); 1406 smc->sk.sk_state_change(&smc->sk); 1407 } 1408 1409 /* kill a connection */ 1410 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1411 { 1412 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1413 1414 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1415 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1416 else 1417 smc_close_abort(conn); 1418 conn->killed = 1; 1419 smc->sk.sk_err = ECONNABORTED; 1420 smc_sk_wake_ups(smc); 1421 if (conn->lgr->is_smcd) { 1422 smc_ism_unset_conn(conn); 1423 if (soft) 1424 tasklet_kill(&conn->rx_tsklet); 1425 else 1426 tasklet_unlock_wait(&conn->rx_tsklet); 1427 } else { 1428 smc_cdc_wait_pend_tx_wr(conn); 1429 } 1430 smc_lgr_unregister_conn(conn); 1431 smc_close_active_abort(smc); 1432 } 1433 1434 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1435 { 1436 if (lgr->is_smcd) { 1437 smc_ism_signal_shutdown(lgr); 1438 } else { 1439 u32 rsn = lgr->llc_termination_rsn; 1440 1441 if (!rsn) 1442 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1443 smc_llc_send_link_delete_all(lgr, false, rsn); 1444 smcr_lgr_link_deactivate_all(lgr); 1445 } 1446 } 1447 1448 /* terminate link group 1449 * @soft: true if link group shutdown can take its time 1450 * false if immediate link group shutdown is required 1451 */ 1452 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1453 { 1454 struct smc_connection *conn; 1455 struct smc_sock *smc; 1456 struct rb_node *node; 1457 1458 if (lgr->terminating) 1459 return; /* lgr already terminating */ 1460 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1461 cancel_delayed_work_sync(&lgr->free_work); 1462 lgr->terminating = 1; 1463 1464 /* kill remaining link group connections */ 1465 read_lock_bh(&lgr->conns_lock); 1466 node = rb_first(&lgr->conns_all); 1467 while (node) { 1468 read_unlock_bh(&lgr->conns_lock); 1469 conn = rb_entry(node, struct smc_connection, alert_node); 1470 smc = container_of(conn, struct smc_sock, conn); 1471 sock_hold(&smc->sk); /* sock_put below */ 1472 lock_sock(&smc->sk); 1473 smc_conn_kill(conn, soft); 1474 release_sock(&smc->sk); 1475 sock_put(&smc->sk); /* sock_hold above */ 1476 read_lock_bh(&lgr->conns_lock); 1477 node = rb_first(&lgr->conns_all); 1478 } 1479 read_unlock_bh(&lgr->conns_lock); 1480 smc_lgr_cleanup(lgr); 1481 smc_lgr_free(lgr); 1482 } 1483 1484 /* unlink link group and schedule termination */ 1485 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1486 { 1487 spinlock_t *lgr_lock; 1488 1489 smc_lgr_list_head(lgr, &lgr_lock); 1490 spin_lock_bh(lgr_lock); 1491 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1492 spin_unlock_bh(lgr_lock); 1493 return; /* lgr already terminating */ 1494 } 1495 list_del_init(&lgr->list); 1496 lgr->freeing = 1; 1497 spin_unlock_bh(lgr_lock); 1498 schedule_work(&lgr->terminate_work); 1499 } 1500 1501 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1502 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan) 1503 { 1504 struct smc_link_group *lgr, *l; 1505 LIST_HEAD(lgr_free_list); 1506 1507 /* run common cleanup function and build free list */ 1508 spin_lock_bh(&dev->lgr_lock); 1509 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1510 if ((!peer_gid || lgr->peer_gid == peer_gid) && 1511 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1512 if (peer_gid) /* peer triggered termination */ 1513 lgr->peer_shutdown = 1; 1514 list_move(&lgr->list, &lgr_free_list); 1515 lgr->freeing = 1; 1516 } 1517 } 1518 spin_unlock_bh(&dev->lgr_lock); 1519 1520 /* cancel the regular free workers and actually free lgrs */ 1521 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1522 list_del_init(&lgr->list); 1523 schedule_work(&lgr->terminate_work); 1524 } 1525 } 1526 1527 /* Called when an SMCD device is removed or the smc module is unloaded */ 1528 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1529 { 1530 struct smc_link_group *lgr, *lg; 1531 LIST_HEAD(lgr_free_list); 1532 1533 spin_lock_bh(&smcd->lgr_lock); 1534 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1535 list_for_each_entry(lgr, &lgr_free_list, list) 1536 lgr->freeing = 1; 1537 spin_unlock_bh(&smcd->lgr_lock); 1538 1539 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1540 list_del_init(&lgr->list); 1541 __smc_lgr_terminate(lgr, false); 1542 } 1543 1544 if (atomic_read(&smcd->lgr_cnt)) 1545 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1546 } 1547 1548 /* Called when an SMCR device is removed or the smc module is unloaded. 1549 * If smcibdev is given, all SMCR link groups using this device are terminated. 1550 * If smcibdev is NULL, all SMCR link groups are terminated. 1551 */ 1552 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1553 { 1554 struct smc_link_group *lgr, *lg; 1555 LIST_HEAD(lgr_free_list); 1556 int i; 1557 1558 spin_lock_bh(&smc_lgr_list.lock); 1559 if (!smcibdev) { 1560 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1561 list_for_each_entry(lgr, &lgr_free_list, list) 1562 lgr->freeing = 1; 1563 } else { 1564 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1565 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1566 if (lgr->lnk[i].smcibdev == smcibdev) 1567 smcr_link_down_cond_sched(&lgr->lnk[i]); 1568 } 1569 } 1570 } 1571 spin_unlock_bh(&smc_lgr_list.lock); 1572 1573 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1574 list_del_init(&lgr->list); 1575 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1576 __smc_lgr_terminate(lgr, false); 1577 } 1578 1579 if (smcibdev) { 1580 if (atomic_read(&smcibdev->lnk_cnt)) 1581 wait_event(smcibdev->lnks_deleted, 1582 !atomic_read(&smcibdev->lnk_cnt)); 1583 } else { 1584 if (atomic_read(&lgr_cnt)) 1585 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1586 } 1587 } 1588 1589 /* set new lgr type and clear all asymmetric link tagging */ 1590 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1591 { 1592 char *lgr_type = ""; 1593 int i; 1594 1595 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1596 if (smc_link_usable(&lgr->lnk[i])) 1597 lgr->lnk[i].link_is_asym = false; 1598 if (lgr->type == new_type) 1599 return; 1600 lgr->type = new_type; 1601 1602 switch (lgr->type) { 1603 case SMC_LGR_NONE: 1604 lgr_type = "NONE"; 1605 break; 1606 case SMC_LGR_SINGLE: 1607 lgr_type = "SINGLE"; 1608 break; 1609 case SMC_LGR_SYMMETRIC: 1610 lgr_type = "SYMMETRIC"; 1611 break; 1612 case SMC_LGR_ASYMMETRIC_PEER: 1613 lgr_type = "ASYMMETRIC_PEER"; 1614 break; 1615 case SMC_LGR_ASYMMETRIC_LOCAL: 1616 lgr_type = "ASYMMETRIC_LOCAL"; 1617 break; 1618 } 1619 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1620 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1621 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1622 } 1623 1624 /* set new lgr type and tag a link as asymmetric */ 1625 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1626 enum smc_lgr_type new_type, int asym_lnk_idx) 1627 { 1628 smcr_lgr_set_type(lgr, new_type); 1629 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1630 } 1631 1632 /* abort connection, abort_work scheduled from tasklet context */ 1633 static void smc_conn_abort_work(struct work_struct *work) 1634 { 1635 struct smc_connection *conn = container_of(work, 1636 struct smc_connection, 1637 abort_work); 1638 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1639 1640 lock_sock(&smc->sk); 1641 smc_conn_kill(conn, true); 1642 release_sock(&smc->sk); 1643 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1644 } 1645 1646 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1647 { 1648 struct smc_link_group *lgr, *n; 1649 1650 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1651 struct smc_link *link; 1652 1653 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1654 SMC_MAX_PNETID_LEN) || 1655 lgr->type == SMC_LGR_SYMMETRIC || 1656 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1657 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1658 continue; 1659 1660 /* trigger local add link processing */ 1661 link = smc_llc_usable_link(lgr); 1662 if (link) 1663 smc_llc_add_link_local(link); 1664 } 1665 } 1666 1667 /* link is down - switch connections to alternate link, 1668 * must be called under lgr->llc_conf_mutex lock 1669 */ 1670 static void smcr_link_down(struct smc_link *lnk) 1671 { 1672 struct smc_link_group *lgr = lnk->lgr; 1673 struct smc_link *to_lnk; 1674 int del_link_id; 1675 1676 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1677 return; 1678 1679 to_lnk = smc_switch_conns(lgr, lnk, true); 1680 if (!to_lnk) { /* no backup link available */ 1681 smcr_link_clear(lnk, true); 1682 return; 1683 } 1684 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1685 del_link_id = lnk->link_id; 1686 1687 if (lgr->role == SMC_SERV) { 1688 /* trigger local delete link processing */ 1689 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1690 } else { 1691 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1692 /* another llc task is ongoing */ 1693 mutex_unlock(&lgr->llc_conf_mutex); 1694 wait_event_timeout(lgr->llc_flow_waiter, 1695 (list_empty(&lgr->list) || 1696 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1697 SMC_LLC_WAIT_TIME); 1698 mutex_lock(&lgr->llc_conf_mutex); 1699 } 1700 if (!list_empty(&lgr->list)) { 1701 smc_llc_send_delete_link(to_lnk, del_link_id, 1702 SMC_LLC_REQ, true, 1703 SMC_LLC_DEL_LOST_PATH); 1704 smcr_link_clear(lnk, true); 1705 } 1706 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1707 } 1708 } 1709 1710 /* must be called under lgr->llc_conf_mutex lock */ 1711 void smcr_link_down_cond(struct smc_link *lnk) 1712 { 1713 if (smc_link_downing(&lnk->state)) { 1714 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1715 smcr_link_down(lnk); 1716 } 1717 } 1718 1719 /* will get the lgr->llc_conf_mutex lock */ 1720 void smcr_link_down_cond_sched(struct smc_link *lnk) 1721 { 1722 if (smc_link_downing(&lnk->state)) { 1723 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1724 schedule_work(&lnk->link_down_wrk); 1725 } 1726 } 1727 1728 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1729 { 1730 struct smc_link_group *lgr, *n; 1731 int i; 1732 1733 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1734 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1735 SMC_MAX_PNETID_LEN)) 1736 continue; /* lgr is not affected */ 1737 if (list_empty(&lgr->list)) 1738 continue; 1739 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1740 struct smc_link *lnk = &lgr->lnk[i]; 1741 1742 if (smc_link_usable(lnk) && 1743 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1744 smcr_link_down_cond_sched(lnk); 1745 } 1746 } 1747 } 1748 1749 static void smc_link_down_work(struct work_struct *work) 1750 { 1751 struct smc_link *link = container_of(work, struct smc_link, 1752 link_down_wrk); 1753 struct smc_link_group *lgr = link->lgr; 1754 1755 if (list_empty(&lgr->list)) 1756 return; 1757 wake_up_all(&lgr->llc_msg_waiter); 1758 mutex_lock(&lgr->llc_conf_mutex); 1759 smcr_link_down(link); 1760 mutex_unlock(&lgr->llc_conf_mutex); 1761 } 1762 1763 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1764 struct netdev_nested_priv *priv) 1765 { 1766 unsigned short *vlan_id = (unsigned short *)priv->data; 1767 1768 if (is_vlan_dev(lower_dev)) { 1769 *vlan_id = vlan_dev_vlan_id(lower_dev); 1770 return 1; 1771 } 1772 1773 return 0; 1774 } 1775 1776 /* Determine vlan of internal TCP socket. */ 1777 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1778 { 1779 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1780 struct netdev_nested_priv priv; 1781 struct net_device *ndev; 1782 int rc = 0; 1783 1784 ini->vlan_id = 0; 1785 if (!dst) { 1786 rc = -ENOTCONN; 1787 goto out; 1788 } 1789 if (!dst->dev) { 1790 rc = -ENODEV; 1791 goto out_rel; 1792 } 1793 1794 ndev = dst->dev; 1795 if (is_vlan_dev(ndev)) { 1796 ini->vlan_id = vlan_dev_vlan_id(ndev); 1797 goto out_rel; 1798 } 1799 1800 priv.data = (void *)&ini->vlan_id; 1801 rtnl_lock(); 1802 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1803 rtnl_unlock(); 1804 1805 out_rel: 1806 dst_release(dst); 1807 out: 1808 return rc; 1809 } 1810 1811 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1812 u8 peer_systemid[], 1813 u8 peer_gid[], 1814 u8 peer_mac_v1[], 1815 enum smc_lgr_role role, u32 clcqpn, 1816 struct net *net) 1817 { 1818 struct smc_link *lnk; 1819 int i; 1820 1821 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1822 lgr->role != role) 1823 return false; 1824 1825 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1826 lnk = &lgr->lnk[i]; 1827 1828 if (!smc_link_active(lnk)) 1829 continue; 1830 /* use verbs API to check netns, instead of lgr->net */ 1831 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1832 return false; 1833 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1834 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1835 (smcr_version == SMC_V2 || 1836 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1837 return true; 1838 } 1839 return false; 1840 } 1841 1842 static bool smcd_lgr_match(struct smc_link_group *lgr, 1843 struct smcd_dev *smcismdev, u64 peer_gid) 1844 { 1845 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; 1846 } 1847 1848 /* create a new SMC connection (and a new link group if necessary) */ 1849 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1850 { 1851 struct smc_connection *conn = &smc->conn; 1852 struct net *net = sock_net(&smc->sk); 1853 struct list_head *lgr_list; 1854 struct smc_link_group *lgr; 1855 enum smc_lgr_role role; 1856 spinlock_t *lgr_lock; 1857 int rc = 0; 1858 1859 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1860 &smc_lgr_list.list; 1861 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1862 &smc_lgr_list.lock; 1863 ini->first_contact_local = 1; 1864 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1865 if (role == SMC_CLNT && ini->first_contact_peer) 1866 /* create new link group as well */ 1867 goto create; 1868 1869 /* determine if an existing link group can be reused */ 1870 spin_lock_bh(lgr_lock); 1871 list_for_each_entry(lgr, lgr_list, list) { 1872 write_lock_bh(&lgr->conns_lock); 1873 if ((ini->is_smcd ? 1874 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1875 ini->ism_peer_gid[ini->ism_selected]) : 1876 smcr_lgr_match(lgr, ini->smcr_version, 1877 ini->peer_systemid, 1878 ini->peer_gid, ini->peer_mac, role, 1879 ini->ib_clcqpn, net)) && 1880 !lgr->sync_err && 1881 (ini->smcd_version == SMC_V2 || 1882 lgr->vlan_id == ini->vlan_id) && 1883 (role == SMC_CLNT || ini->is_smcd || 1884 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX && 1885 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1886 /* link group found */ 1887 ini->first_contact_local = 0; 1888 conn->lgr = lgr; 1889 rc = smc_lgr_register_conn(conn, false); 1890 write_unlock_bh(&lgr->conns_lock); 1891 if (!rc && delayed_work_pending(&lgr->free_work)) 1892 cancel_delayed_work(&lgr->free_work); 1893 break; 1894 } 1895 write_unlock_bh(&lgr->conns_lock); 1896 } 1897 spin_unlock_bh(lgr_lock); 1898 if (rc) 1899 return rc; 1900 1901 if (role == SMC_CLNT && !ini->first_contact_peer && 1902 ini->first_contact_local) { 1903 /* Server reuses a link group, but Client wants to start 1904 * a new one 1905 * send out_of_sync decline, reason synchr. error 1906 */ 1907 return SMC_CLC_DECL_SYNCERR; 1908 } 1909 1910 create: 1911 if (ini->first_contact_local) { 1912 rc = smc_lgr_create(smc, ini); 1913 if (rc) 1914 goto out; 1915 lgr = conn->lgr; 1916 write_lock_bh(&lgr->conns_lock); 1917 rc = smc_lgr_register_conn(conn, true); 1918 write_unlock_bh(&lgr->conns_lock); 1919 if (rc) { 1920 smc_lgr_cleanup_early(lgr); 1921 goto out; 1922 } 1923 } 1924 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 1925 if (!conn->lgr->is_smcd) 1926 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 1927 conn->freed = 0; 1928 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 1929 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 1930 conn->urg_state = SMC_URG_READ; 1931 init_waitqueue_head(&conn->cdc_pend_tx_wq); 1932 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 1933 if (ini->is_smcd) { 1934 conn->rx_off = sizeof(struct smcd_cdc_msg); 1935 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 1936 } else { 1937 conn->rx_off = 0; 1938 } 1939 #ifndef KERNEL_HAS_ATOMIC64 1940 spin_lock_init(&conn->acurs_lock); 1941 #endif 1942 1943 out: 1944 return rc; 1945 } 1946 1947 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 1948 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */ 1949 1950 /* convert the RMB size into the compressed notation (minimum 16K, see 1951 * SMCD/R_DMBE_SIZES. 1952 * In contrast to plain ilog2, this rounds towards the next power of 2, 1953 * so the socket application gets at least its desired sndbuf / rcvbuf size. 1954 */ 1955 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 1956 { 1957 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE; 1958 u8 compressed; 1959 1960 if (size <= SMC_BUF_MIN_SIZE) 1961 return 0; 1962 1963 size = (size - 1) >> 14; /* convert to 16K multiple */ 1964 compressed = min_t(u8, ilog2(size) + 1, 1965 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 1966 1967 if (!is_smcd && is_rmb) 1968 /* RMBs are backed by & limited to max size of scatterlists */ 1969 compressed = min_t(u8, compressed, ilog2(max_scat >> 14)); 1970 1971 return compressed; 1972 } 1973 1974 /* convert the RMB size from compressed notation into integer */ 1975 int smc_uncompress_bufsize(u8 compressed) 1976 { 1977 u32 size; 1978 1979 size = 0x00000001 << (((int)compressed) + 14); 1980 return (int)size; 1981 } 1982 1983 /* try to reuse a sndbuf or rmb description slot for a certain 1984 * buffer size; if not available, return NULL 1985 */ 1986 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 1987 struct mutex *lock, 1988 struct list_head *buf_list) 1989 { 1990 struct smc_buf_desc *buf_slot; 1991 1992 mutex_lock(lock); 1993 list_for_each_entry(buf_slot, buf_list, list) { 1994 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 1995 mutex_unlock(lock); 1996 return buf_slot; 1997 } 1998 } 1999 mutex_unlock(lock); 2000 return NULL; 2001 } 2002 2003 /* one of the conditions for announcing a receiver's current window size is 2004 * that it "results in a minimum increase in the window size of 10% of the 2005 * receive buffer space" [RFC7609] 2006 */ 2007 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2008 { 2009 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2010 } 2011 2012 /* map an buf to a link */ 2013 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2014 struct smc_link *lnk) 2015 { 2016 int rc, i, nents, offset, buf_size, size, access_flags; 2017 struct scatterlist *sg; 2018 void *buf; 2019 2020 if (buf_desc->is_map_ib[lnk->link_idx]) 2021 return 0; 2022 2023 if (buf_desc->is_vm) { 2024 buf = buf_desc->cpu_addr; 2025 buf_size = buf_desc->len; 2026 offset = offset_in_page(buf_desc->cpu_addr); 2027 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2028 } else { 2029 nents = 1; 2030 } 2031 2032 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2033 if (rc) 2034 return rc; 2035 2036 if (buf_desc->is_vm) { 2037 /* virtually contiguous buffer */ 2038 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2039 size = min_t(int, PAGE_SIZE - offset, buf_size); 2040 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2041 buf += size / sizeof(*buf); 2042 buf_size -= size; 2043 offset = 0; 2044 } 2045 } else { 2046 /* physically contiguous buffer */ 2047 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2048 buf_desc->cpu_addr, buf_desc->len); 2049 } 2050 2051 /* map sg table to DMA address */ 2052 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2053 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2054 /* SMC protocol depends on mapping to one DMA address only */ 2055 if (rc != nents) { 2056 rc = -EAGAIN; 2057 goto free_table; 2058 } 2059 2060 buf_desc->is_dma_need_sync |= 2061 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2062 2063 if (is_rmb || buf_desc->is_vm) { 2064 /* create a new memory region for the RMB or vzalloced sndbuf */ 2065 access_flags = is_rmb ? 2066 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2067 IB_ACCESS_LOCAL_WRITE; 2068 2069 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2070 buf_desc, lnk->link_idx); 2071 if (rc) 2072 goto buf_unmap; 2073 smc_ib_sync_sg_for_device(lnk, buf_desc, 2074 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2075 } 2076 buf_desc->is_map_ib[lnk->link_idx] = true; 2077 return 0; 2078 2079 buf_unmap: 2080 smc_ib_buf_unmap_sg(lnk, buf_desc, 2081 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2082 free_table: 2083 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2084 return rc; 2085 } 2086 2087 /* register a new buf on IB device, rmb or vzalloced sndbuf 2088 * must be called under lgr->llc_conf_mutex lock 2089 */ 2090 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2091 { 2092 if (list_empty(&link->lgr->list)) 2093 return -ENOLINK; 2094 if (!buf_desc->is_reg_mr[link->link_idx]) { 2095 /* register memory region for new buf */ 2096 if (buf_desc->is_vm) 2097 buf_desc->mr[link->link_idx]->iova = 2098 (uintptr_t)buf_desc->cpu_addr; 2099 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2100 buf_desc->is_reg_err = true; 2101 return -EFAULT; 2102 } 2103 buf_desc->is_reg_mr[link->link_idx] = true; 2104 } 2105 return 0; 2106 } 2107 2108 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock, 2109 struct list_head *lst, bool is_rmb) 2110 { 2111 struct smc_buf_desc *buf_desc, *bf; 2112 int rc = 0; 2113 2114 mutex_lock(lock); 2115 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2116 if (!buf_desc->used) 2117 continue; 2118 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2119 if (rc) 2120 goto out; 2121 } 2122 out: 2123 mutex_unlock(lock); 2124 return rc; 2125 } 2126 2127 /* map all used buffers of lgr for a new link */ 2128 int smcr_buf_map_lgr(struct smc_link *lnk) 2129 { 2130 struct smc_link_group *lgr = lnk->lgr; 2131 int i, rc = 0; 2132 2133 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2134 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2135 &lgr->rmbs[i], true); 2136 if (rc) 2137 return rc; 2138 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2139 &lgr->sndbufs[i], false); 2140 if (rc) 2141 return rc; 2142 } 2143 return 0; 2144 } 2145 2146 /* register all used buffers of lgr for a new link, 2147 * must be called under lgr->llc_conf_mutex lock 2148 */ 2149 int smcr_buf_reg_lgr(struct smc_link *lnk) 2150 { 2151 struct smc_link_group *lgr = lnk->lgr; 2152 struct smc_buf_desc *buf_desc, *bf; 2153 int i, rc = 0; 2154 2155 /* reg all RMBs for a new link */ 2156 mutex_lock(&lgr->rmbs_lock); 2157 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2158 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2159 if (!buf_desc->used) 2160 continue; 2161 rc = smcr_link_reg_buf(lnk, buf_desc); 2162 if (rc) { 2163 mutex_unlock(&lgr->rmbs_lock); 2164 return rc; 2165 } 2166 } 2167 } 2168 mutex_unlock(&lgr->rmbs_lock); 2169 2170 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2171 return rc; 2172 2173 /* reg all vzalloced sndbufs for a new link */ 2174 mutex_lock(&lgr->sndbufs_lock); 2175 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2176 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2177 if (!buf_desc->used || !buf_desc->is_vm) 2178 continue; 2179 rc = smcr_link_reg_buf(lnk, buf_desc); 2180 if (rc) { 2181 mutex_unlock(&lgr->sndbufs_lock); 2182 return rc; 2183 } 2184 } 2185 } 2186 mutex_unlock(&lgr->sndbufs_lock); 2187 return rc; 2188 } 2189 2190 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2191 bool is_rmb, int bufsize) 2192 { 2193 struct smc_buf_desc *buf_desc; 2194 2195 /* try to alloc a new buffer */ 2196 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2197 if (!buf_desc) 2198 return ERR_PTR(-ENOMEM); 2199 2200 switch (lgr->buf_type) { 2201 case SMCR_PHYS_CONT_BUFS: 2202 case SMCR_MIXED_BUFS: 2203 buf_desc->order = get_order(bufsize); 2204 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2205 __GFP_NOMEMALLOC | __GFP_COMP | 2206 __GFP_NORETRY | __GFP_ZERO, 2207 buf_desc->order); 2208 if (buf_desc->pages) { 2209 buf_desc->cpu_addr = 2210 (void *)page_address(buf_desc->pages); 2211 buf_desc->len = bufsize; 2212 buf_desc->is_vm = false; 2213 break; 2214 } 2215 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2216 goto out; 2217 fallthrough; // try virtually continguous buf 2218 case SMCR_VIRT_CONT_BUFS: 2219 buf_desc->order = get_order(bufsize); 2220 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2221 if (!buf_desc->cpu_addr) 2222 goto out; 2223 buf_desc->pages = NULL; 2224 buf_desc->len = bufsize; 2225 buf_desc->is_vm = true; 2226 break; 2227 } 2228 return buf_desc; 2229 2230 out: 2231 kfree(buf_desc); 2232 return ERR_PTR(-EAGAIN); 2233 } 2234 2235 /* map buf_desc on all usable links, 2236 * unused buffers stay mapped as long as the link is up 2237 */ 2238 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2239 struct smc_buf_desc *buf_desc, bool is_rmb) 2240 { 2241 int i, rc = 0; 2242 2243 /* protect against parallel link reconfiguration */ 2244 mutex_lock(&lgr->llc_conf_mutex); 2245 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2246 struct smc_link *lnk = &lgr->lnk[i]; 2247 2248 if (!smc_link_usable(lnk)) 2249 continue; 2250 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2251 rc = -ENOMEM; 2252 goto out; 2253 } 2254 } 2255 out: 2256 mutex_unlock(&lgr->llc_conf_mutex); 2257 return rc; 2258 } 2259 2260 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2261 bool is_dmb, int bufsize) 2262 { 2263 struct smc_buf_desc *buf_desc; 2264 int rc; 2265 2266 /* try to alloc a new DMB */ 2267 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2268 if (!buf_desc) 2269 return ERR_PTR(-ENOMEM); 2270 if (is_dmb) { 2271 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2272 if (rc) { 2273 kfree(buf_desc); 2274 if (rc == -ENOMEM) 2275 return ERR_PTR(-EAGAIN); 2276 if (rc == -ENOSPC) 2277 return ERR_PTR(-ENOSPC); 2278 return ERR_PTR(-EIO); 2279 } 2280 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2281 /* CDC header stored in buf. So, pretend it was smaller */ 2282 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2283 } else { 2284 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2285 __GFP_NOWARN | __GFP_NORETRY | 2286 __GFP_NOMEMALLOC); 2287 if (!buf_desc->cpu_addr) { 2288 kfree(buf_desc); 2289 return ERR_PTR(-EAGAIN); 2290 } 2291 buf_desc->len = bufsize; 2292 } 2293 return buf_desc; 2294 } 2295 2296 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2297 { 2298 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2299 struct smc_connection *conn = &smc->conn; 2300 struct smc_link_group *lgr = conn->lgr; 2301 struct list_head *buf_list; 2302 int bufsize, bufsize_short; 2303 bool is_dgraded = false; 2304 struct mutex *lock; /* lock buffer list */ 2305 int sk_buf_size; 2306 2307 if (is_rmb) 2308 /* use socket recv buffer size (w/o overhead) as start value */ 2309 sk_buf_size = smc->sk.sk_rcvbuf / 2; 2310 else 2311 /* use socket send buffer size (w/o overhead) as start value */ 2312 sk_buf_size = smc->sk.sk_sndbuf / 2; 2313 2314 for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb); 2315 bufsize_short >= 0; bufsize_short--) { 2316 if (is_rmb) { 2317 lock = &lgr->rmbs_lock; 2318 buf_list = &lgr->rmbs[bufsize_short]; 2319 } else { 2320 lock = &lgr->sndbufs_lock; 2321 buf_list = &lgr->sndbufs[bufsize_short]; 2322 } 2323 bufsize = smc_uncompress_bufsize(bufsize_short); 2324 2325 /* check for reusable slot in the link group */ 2326 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list); 2327 if (buf_desc) { 2328 buf_desc->is_dma_need_sync = 0; 2329 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2330 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2331 break; /* found reusable slot */ 2332 } 2333 2334 if (is_smcd) 2335 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2336 else 2337 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); 2338 2339 if (PTR_ERR(buf_desc) == -ENOMEM) 2340 break; 2341 if (IS_ERR(buf_desc)) { 2342 if (!is_dgraded) { 2343 is_dgraded = true; 2344 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2345 } 2346 continue; 2347 } 2348 2349 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2350 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2351 buf_desc->used = 1; 2352 mutex_lock(lock); 2353 list_add(&buf_desc->list, buf_list); 2354 mutex_unlock(lock); 2355 break; /* found */ 2356 } 2357 2358 if (IS_ERR(buf_desc)) 2359 return PTR_ERR(buf_desc); 2360 2361 if (!is_smcd) { 2362 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2363 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2364 return -ENOMEM; 2365 } 2366 } 2367 2368 if (is_rmb) { 2369 conn->rmb_desc = buf_desc; 2370 conn->rmbe_size_short = bufsize_short; 2371 smc->sk.sk_rcvbuf = bufsize * 2; 2372 atomic_set(&conn->bytes_to_rcv, 0); 2373 conn->rmbe_update_limit = 2374 smc_rmb_wnd_update_limit(buf_desc->len); 2375 if (is_smcd) 2376 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2377 } else { 2378 conn->sndbuf_desc = buf_desc; 2379 smc->sk.sk_sndbuf = bufsize * 2; 2380 atomic_set(&conn->sndbuf_space, bufsize); 2381 } 2382 return 0; 2383 } 2384 2385 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2386 { 2387 if (!conn->sndbuf_desc->is_dma_need_sync) 2388 return; 2389 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2390 !smc_link_active(conn->lnk)) 2391 return; 2392 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2393 } 2394 2395 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2396 { 2397 int i; 2398 2399 if (!conn->rmb_desc->is_dma_need_sync) 2400 return; 2401 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2402 return; 2403 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2404 if (!smc_link_active(&conn->lgr->lnk[i])) 2405 continue; 2406 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2407 DMA_FROM_DEVICE); 2408 } 2409 } 2410 2411 /* create the send and receive buffer for an SMC socket; 2412 * receive buffers are called RMBs; 2413 * (even though the SMC protocol allows more than one RMB-element per RMB, 2414 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2415 * extra RMB for every connection in a link group 2416 */ 2417 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2418 { 2419 int rc; 2420 2421 /* create send buffer */ 2422 rc = __smc_buf_create(smc, is_smcd, false); 2423 if (rc) 2424 return rc; 2425 /* create rmb */ 2426 rc = __smc_buf_create(smc, is_smcd, true); 2427 if (rc) { 2428 mutex_lock(&smc->conn.lgr->sndbufs_lock); 2429 list_del(&smc->conn.sndbuf_desc->list); 2430 mutex_unlock(&smc->conn.lgr->sndbufs_lock); 2431 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2432 smc->conn.sndbuf_desc = NULL; 2433 } 2434 return rc; 2435 } 2436 2437 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2438 { 2439 int i; 2440 2441 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2442 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2443 return i; 2444 } 2445 return -ENOSPC; 2446 } 2447 2448 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2449 u32 rkey) 2450 { 2451 int i; 2452 2453 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2454 if (test_bit(i, lgr->rtokens_used_mask) && 2455 lgr->rtokens[i][lnk_idx].rkey == rkey) 2456 return i; 2457 } 2458 return -ENOENT; 2459 } 2460 2461 /* set rtoken for a new link to an existing rmb */ 2462 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2463 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2464 { 2465 int rtok_idx; 2466 2467 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2468 if (rtok_idx == -ENOENT) 2469 return; 2470 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2471 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2472 } 2473 2474 /* set rtoken for a new link whose link_id is given */ 2475 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2476 __be64 nw_vaddr, __be32 nw_rkey) 2477 { 2478 u64 dma_addr = be64_to_cpu(nw_vaddr); 2479 u32 rkey = ntohl(nw_rkey); 2480 bool found = false; 2481 int link_idx; 2482 2483 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2484 if (lgr->lnk[link_idx].link_id == link_id) { 2485 found = true; 2486 break; 2487 } 2488 } 2489 if (!found) 2490 return; 2491 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2492 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2493 } 2494 2495 /* add a new rtoken from peer */ 2496 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2497 { 2498 struct smc_link_group *lgr = smc_get_lgr(lnk); 2499 u64 dma_addr = be64_to_cpu(nw_vaddr); 2500 u32 rkey = ntohl(nw_rkey); 2501 int i; 2502 2503 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2504 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2505 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2506 test_bit(i, lgr->rtokens_used_mask)) { 2507 /* already in list */ 2508 return i; 2509 } 2510 } 2511 i = smc_rmb_reserve_rtoken_idx(lgr); 2512 if (i < 0) 2513 return i; 2514 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2515 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2516 return i; 2517 } 2518 2519 /* delete an rtoken from all links */ 2520 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2521 { 2522 struct smc_link_group *lgr = smc_get_lgr(lnk); 2523 u32 rkey = ntohl(nw_rkey); 2524 int i, j; 2525 2526 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2527 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2528 test_bit(i, lgr->rtokens_used_mask)) { 2529 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2530 lgr->rtokens[i][j].rkey = 0; 2531 lgr->rtokens[i][j].dma_addr = 0; 2532 } 2533 clear_bit(i, lgr->rtokens_used_mask); 2534 return 0; 2535 } 2536 } 2537 return -ENOENT; 2538 } 2539 2540 /* save rkey and dma_addr received from peer during clc handshake */ 2541 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2542 struct smc_link *lnk, 2543 struct smc_clc_msg_accept_confirm *clc) 2544 { 2545 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2546 clc->r0.rmb_rkey); 2547 if (conn->rtoken_idx < 0) 2548 return conn->rtoken_idx; 2549 return 0; 2550 } 2551 2552 static void smc_core_going_away(void) 2553 { 2554 struct smc_ib_device *smcibdev; 2555 struct smcd_dev *smcd; 2556 2557 mutex_lock(&smc_ib_devices.mutex); 2558 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2559 int i; 2560 2561 for (i = 0; i < SMC_MAX_PORTS; i++) 2562 set_bit(i, smcibdev->ports_going_away); 2563 } 2564 mutex_unlock(&smc_ib_devices.mutex); 2565 2566 mutex_lock(&smcd_dev_list.mutex); 2567 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2568 smcd->going_away = 1; 2569 } 2570 mutex_unlock(&smcd_dev_list.mutex); 2571 } 2572 2573 /* Clean up all SMC link groups */ 2574 static void smc_lgrs_shutdown(void) 2575 { 2576 struct smcd_dev *smcd; 2577 2578 smc_core_going_away(); 2579 2580 smc_smcr_terminate_all(NULL); 2581 2582 mutex_lock(&smcd_dev_list.mutex); 2583 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2584 smc_smcd_terminate_all(smcd); 2585 mutex_unlock(&smcd_dev_list.mutex); 2586 } 2587 2588 static int smc_core_reboot_event(struct notifier_block *this, 2589 unsigned long event, void *ptr) 2590 { 2591 smc_lgrs_shutdown(); 2592 smc_ib_unregister_client(); 2593 return 0; 2594 } 2595 2596 static struct notifier_block smc_reboot_notifier = { 2597 .notifier_call = smc_core_reboot_event, 2598 }; 2599 2600 int __init smc_core_init(void) 2601 { 2602 return register_reboot_notifier(&smc_reboot_notifier); 2603 } 2604 2605 /* Called (from smc_exit) when module is removed */ 2606 void smc_core_exit(void) 2607 { 2608 unregister_reboot_notifier(&smc_reboot_notifier); 2609 smc_lgrs_shutdown(); 2610 } 2611