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 smcd_dev *smcd = lgr->smcd; 504 struct nlattr *attrs; 505 void *nlh; 506 507 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 508 &smc_gen_nl_family, NLM_F_MULTI, 509 SMC_NETLINK_GET_LGR_SMCD); 510 if (!nlh) 511 goto errmsg; 512 513 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD); 514 if (!attrs) 515 goto errout; 516 517 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id))) 518 goto errattr; 519 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, 520 smcd->ops->get_local_gid(smcd), 521 SMC_NLA_LGR_D_PAD)) 522 goto errattr; 523 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid, 524 SMC_NLA_LGR_D_PAD)) 525 goto errattr; 526 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id)) 527 goto errattr; 528 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num)) 529 goto errattr; 530 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd))) 531 goto errattr; 532 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN); 533 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 534 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet)) 535 goto errattr; 536 if (lgr->smc_version > SMC_V1) { 537 struct nlattr *v2_attrs; 538 539 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON); 540 if (!v2_attrs) 541 goto errattr; 542 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 543 goto errattr; 544 } 545 nla_nest_end(skb, attrs); 546 genlmsg_end(skb, nlh); 547 return 0; 548 549 errattr: 550 nla_nest_cancel(skb, attrs); 551 errout: 552 genlmsg_cancel(skb, nlh); 553 errmsg: 554 return -EMSGSIZE; 555 } 556 557 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev, 558 struct sk_buff *skb, 559 struct netlink_callback *cb) 560 { 561 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 562 struct smc_link_group *lgr; 563 int snum = cb_ctx->pos[1]; 564 int rc = 0, num = 0; 565 566 spin_lock_bh(&dev->lgr_lock); 567 list_for_each_entry(lgr, &dev->lgr_list, list) { 568 if (!lgr->is_smcd) 569 continue; 570 if (num < snum) 571 goto next; 572 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb); 573 if (rc) 574 goto errout; 575 next: 576 num++; 577 } 578 errout: 579 spin_unlock_bh(&dev->lgr_lock); 580 cb_ctx->pos[1] = num; 581 return rc; 582 } 583 584 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list, 585 struct sk_buff *skb, 586 struct netlink_callback *cb) 587 { 588 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 589 struct smcd_dev *smcd_dev; 590 int snum = cb_ctx->pos[0]; 591 int rc = 0, num = 0; 592 593 mutex_lock(&dev_list->mutex); 594 list_for_each_entry(smcd_dev, &dev_list->list, list) { 595 if (list_empty(&smcd_dev->lgr_list)) 596 continue; 597 if (num < snum) 598 goto next; 599 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb); 600 if (rc) 601 goto errout; 602 next: 603 num++; 604 } 605 errout: 606 mutex_unlock(&dev_list->mutex); 607 cb_ctx->pos[0] = num; 608 return rc; 609 } 610 611 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 612 { 613 bool list_links = false; 614 615 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 616 return skb->len; 617 } 618 619 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb) 620 { 621 bool list_links = true; 622 623 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 624 return skb->len; 625 } 626 627 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 628 { 629 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb); 630 return skb->len; 631 } 632 633 void smc_lgr_cleanup_early(struct smc_link_group *lgr) 634 { 635 spinlock_t *lgr_lock; 636 637 if (!lgr) 638 return; 639 640 smc_lgr_list_head(lgr, &lgr_lock); 641 spin_lock_bh(lgr_lock); 642 /* do not use this link group for new connections */ 643 if (!list_empty(&lgr->list)) 644 list_del_init(&lgr->list); 645 spin_unlock_bh(lgr_lock); 646 __smc_lgr_terminate(lgr, true); 647 } 648 649 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 650 { 651 int i; 652 653 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 654 struct smc_link *lnk = &lgr->lnk[i]; 655 656 if (smc_link_sendable(lnk)) 657 lnk->state = SMC_LNK_INACTIVE; 658 } 659 wake_up_all(&lgr->llc_msg_waiter); 660 wake_up_all(&lgr->llc_flow_waiter); 661 } 662 663 static void smc_lgr_free(struct smc_link_group *lgr); 664 665 static void smc_lgr_free_work(struct work_struct *work) 666 { 667 struct smc_link_group *lgr = container_of(to_delayed_work(work), 668 struct smc_link_group, 669 free_work); 670 spinlock_t *lgr_lock; 671 bool conns; 672 673 smc_lgr_list_head(lgr, &lgr_lock); 674 spin_lock_bh(lgr_lock); 675 if (lgr->freeing) { 676 spin_unlock_bh(lgr_lock); 677 return; 678 } 679 read_lock_bh(&lgr->conns_lock); 680 conns = RB_EMPTY_ROOT(&lgr->conns_all); 681 read_unlock_bh(&lgr->conns_lock); 682 if (!conns) { /* number of lgr connections is no longer zero */ 683 spin_unlock_bh(lgr_lock); 684 return; 685 } 686 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 687 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 688 spin_unlock_bh(lgr_lock); 689 cancel_delayed_work(&lgr->free_work); 690 691 if (!lgr->is_smcd && !lgr->terminating) 692 smc_llc_send_link_delete_all(lgr, true, 693 SMC_LLC_DEL_PROG_INIT_TERM); 694 if (lgr->is_smcd && !lgr->terminating) 695 smc_ism_signal_shutdown(lgr); 696 if (!lgr->is_smcd) 697 smcr_lgr_link_deactivate_all(lgr); 698 smc_lgr_free(lgr); 699 } 700 701 static void smc_lgr_terminate_work(struct work_struct *work) 702 { 703 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 704 terminate_work); 705 706 __smc_lgr_terminate(lgr, true); 707 } 708 709 /* return next unique link id for the lgr */ 710 static u8 smcr_next_link_id(struct smc_link_group *lgr) 711 { 712 u8 link_id; 713 int i; 714 715 while (1) { 716 again: 717 link_id = ++lgr->next_link_id; 718 if (!link_id) /* skip zero as link_id */ 719 link_id = ++lgr->next_link_id; 720 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 721 if (smc_link_usable(&lgr->lnk[i]) && 722 lgr->lnk[i].link_id == link_id) 723 goto again; 724 } 725 break; 726 } 727 return link_id; 728 } 729 730 static void smcr_copy_dev_info_to_link(struct smc_link *link) 731 { 732 struct smc_ib_device *smcibdev = link->smcibdev; 733 734 snprintf(link->ibname, sizeof(link->ibname), "%s", 735 smcibdev->ibdev->name); 736 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; 737 } 738 739 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 740 u8 link_idx, struct smc_init_info *ini) 741 { 742 struct smc_ib_device *smcibdev; 743 u8 rndvec[3]; 744 int rc; 745 746 if (lgr->smc_version == SMC_V2) { 747 lnk->smcibdev = ini->smcrv2.ib_dev_v2; 748 lnk->ibport = ini->smcrv2.ib_port_v2; 749 } else { 750 lnk->smcibdev = ini->ib_dev; 751 lnk->ibport = ini->ib_port; 752 } 753 get_device(&lnk->smcibdev->ibdev->dev); 754 atomic_inc(&lnk->smcibdev->lnk_cnt); 755 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 756 lnk->clearing = 0; 757 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 758 lnk->link_id = smcr_next_link_id(lgr); 759 lnk->lgr = lgr; 760 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 761 lnk->link_idx = link_idx; 762 lnk->wr_rx_id_compl = 0; 763 smc_ibdev_cnt_inc(lnk); 764 smcr_copy_dev_info_to_link(lnk); 765 atomic_set(&lnk->conn_cnt, 0); 766 smc_llc_link_set_uid(lnk); 767 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 768 if (!lnk->smcibdev->initialized) { 769 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 770 if (rc) 771 goto out; 772 } 773 get_random_bytes(rndvec, sizeof(rndvec)); 774 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 775 (rndvec[2] << 16); 776 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 777 ini->vlan_id, lnk->gid, &lnk->sgid_index, 778 lgr->smc_version == SMC_V2 ? 779 &ini->smcrv2 : NULL); 780 if (rc) 781 goto out; 782 rc = smc_llc_link_init(lnk); 783 if (rc) 784 goto out; 785 rc = smc_wr_alloc_link_mem(lnk); 786 if (rc) 787 goto clear_llc_lnk; 788 rc = smc_ib_create_protection_domain(lnk); 789 if (rc) 790 goto free_link_mem; 791 rc = smc_ib_create_queue_pair(lnk); 792 if (rc) 793 goto dealloc_pd; 794 rc = smc_wr_create_link(lnk); 795 if (rc) 796 goto destroy_qp; 797 lnk->state = SMC_LNK_ACTIVATING; 798 return 0; 799 800 destroy_qp: 801 smc_ib_destroy_queue_pair(lnk); 802 dealloc_pd: 803 smc_ib_dealloc_protection_domain(lnk); 804 free_link_mem: 805 smc_wr_free_link_mem(lnk); 806 clear_llc_lnk: 807 smc_llc_link_clear(lnk, false); 808 out: 809 smc_ibdev_cnt_dec(lnk); 810 put_device(&lnk->smcibdev->ibdev->dev); 811 smcibdev = lnk->smcibdev; 812 memset(lnk, 0, sizeof(struct smc_link)); 813 lnk->state = SMC_LNK_UNUSED; 814 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 815 wake_up(&smcibdev->lnks_deleted); 816 smc_lgr_put(lgr); /* lgr_hold above */ 817 return rc; 818 } 819 820 /* create a new SMC link group */ 821 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 822 { 823 struct smc_link_group *lgr; 824 struct list_head *lgr_list; 825 struct smcd_dev *smcd; 826 struct smc_link *lnk; 827 spinlock_t *lgr_lock; 828 u8 link_idx; 829 int rc = 0; 830 int i; 831 832 if (ini->is_smcd && ini->vlan_id) { 833 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 834 ini->vlan_id)) { 835 rc = SMC_CLC_DECL_ISMVLANERR; 836 goto out; 837 } 838 } 839 840 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 841 if (!lgr) { 842 rc = SMC_CLC_DECL_MEM; 843 goto ism_put_vlan; 844 } 845 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 846 SMC_LGR_ID_SIZE, &lgr->id); 847 if (!lgr->tx_wq) { 848 rc = -ENOMEM; 849 goto free_lgr; 850 } 851 lgr->is_smcd = ini->is_smcd; 852 lgr->sync_err = 0; 853 lgr->terminating = 0; 854 lgr->freeing = 0; 855 lgr->vlan_id = ini->vlan_id; 856 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 857 init_rwsem(&lgr->sndbufs_lock); 858 init_rwsem(&lgr->rmbs_lock); 859 rwlock_init(&lgr->conns_lock); 860 for (i = 0; i < SMC_RMBE_SIZES; i++) { 861 INIT_LIST_HEAD(&lgr->sndbufs[i]); 862 INIT_LIST_HEAD(&lgr->rmbs[i]); 863 } 864 lgr->next_link_id = 0; 865 smc_lgr_list.num += SMC_LGR_NUM_INCR; 866 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 867 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 868 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 869 lgr->conns_all = RB_ROOT; 870 if (ini->is_smcd) { 871 /* SMC-D specific settings */ 872 smcd = ini->ism_dev[ini->ism_selected]; 873 get_device(smcd->ops->get_dev(smcd)); 874 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected]; 875 lgr->smcd = ini->ism_dev[ini->ism_selected]; 876 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 877 lgr_lock = &lgr->smcd->lgr_lock; 878 lgr->smc_version = ini->smcd_version; 879 lgr->peer_shutdown = 0; 880 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 881 } else { 882 /* SMC-R specific settings */ 883 struct smc_ib_device *ibdev; 884 int ibport; 885 886 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 887 lgr->smc_version = ini->smcr_version; 888 memcpy(lgr->peer_systemid, ini->peer_systemid, 889 SMC_SYSTEMID_LEN); 890 if (lgr->smc_version == SMC_V2) { 891 ibdev = ini->smcrv2.ib_dev_v2; 892 ibport = ini->smcrv2.ib_port_v2; 893 lgr->saddr = ini->smcrv2.saddr; 894 lgr->uses_gateway = ini->smcrv2.uses_gateway; 895 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 896 ETH_ALEN); 897 } else { 898 ibdev = ini->ib_dev; 899 ibport = ini->ib_port; 900 } 901 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 902 SMC_MAX_PNETID_LEN); 903 rc = smc_wr_alloc_lgr_mem(lgr); 904 if (rc) 905 goto free_wq; 906 smc_llc_lgr_init(lgr, smc); 907 908 link_idx = SMC_SINGLE_LINK; 909 lnk = &lgr->lnk[link_idx]; 910 rc = smcr_link_init(lgr, lnk, link_idx, ini); 911 if (rc) { 912 smc_wr_free_lgr_mem(lgr); 913 goto free_wq; 914 } 915 lgr->net = smc_ib_net(lnk->smcibdev); 916 lgr_list = &smc_lgr_list.list; 917 lgr_lock = &smc_lgr_list.lock; 918 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 919 atomic_inc(&lgr_cnt); 920 } 921 smc->conn.lgr = lgr; 922 spin_lock_bh(lgr_lock); 923 list_add_tail(&lgr->list, lgr_list); 924 spin_unlock_bh(lgr_lock); 925 return 0; 926 927 free_wq: 928 destroy_workqueue(lgr->tx_wq); 929 free_lgr: 930 kfree(lgr); 931 ism_put_vlan: 932 if (ini->is_smcd && ini->vlan_id) 933 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 934 out: 935 if (rc < 0) { 936 if (rc == -ENOMEM) 937 rc = SMC_CLC_DECL_MEM; 938 else 939 rc = SMC_CLC_DECL_INTERR; 940 } 941 return rc; 942 } 943 944 static int smc_write_space(struct smc_connection *conn) 945 { 946 int buffer_len = conn->peer_rmbe_size; 947 union smc_host_cursor prod; 948 union smc_host_cursor cons; 949 int space; 950 951 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 952 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 953 /* determine rx_buf space */ 954 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 955 return space; 956 } 957 958 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 959 struct smc_wr_buf *wr_buf) 960 { 961 struct smc_connection *conn = &smc->conn; 962 union smc_host_cursor cons, fin; 963 int rc = 0; 964 int diff; 965 966 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 967 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 968 /* set prod cursor to old state, enforce tx_rdma_writes() */ 969 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 970 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 971 972 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 973 /* cons cursor advanced more than fin, and prod was set 974 * fin above, so now prod is smaller than cons. Fix that. 975 */ 976 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 977 smc_curs_add(conn->sndbuf_desc->len, 978 &conn->tx_curs_sent, diff); 979 smc_curs_add(conn->sndbuf_desc->len, 980 &conn->tx_curs_fin, diff); 981 982 smp_mb__before_atomic(); 983 atomic_add(diff, &conn->sndbuf_space); 984 smp_mb__after_atomic(); 985 986 smc_curs_add(conn->peer_rmbe_size, 987 &conn->local_tx_ctrl.prod, diff); 988 smc_curs_add(conn->peer_rmbe_size, 989 &conn->local_tx_ctrl_fin, diff); 990 } 991 /* recalculate, value is used by tx_rdma_writes() */ 992 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 993 994 if (smc->sk.sk_state != SMC_INIT && 995 smc->sk.sk_state != SMC_CLOSED) { 996 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 997 if (!rc) { 998 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 999 smc->sk.sk_data_ready(&smc->sk); 1000 } 1001 } else { 1002 smc_wr_tx_put_slot(conn->lnk, 1003 (struct smc_wr_tx_pend_priv *)pend); 1004 } 1005 return rc; 1006 } 1007 1008 void smc_switch_link_and_count(struct smc_connection *conn, 1009 struct smc_link *to_lnk) 1010 { 1011 atomic_dec(&conn->lnk->conn_cnt); 1012 /* link_hold in smc_conn_create() */ 1013 smcr_link_put(conn->lnk); 1014 conn->lnk = to_lnk; 1015 atomic_inc(&conn->lnk->conn_cnt); 1016 /* link_put in smc_conn_free() */ 1017 smcr_link_hold(conn->lnk); 1018 } 1019 1020 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1021 struct smc_link *from_lnk, bool is_dev_err) 1022 { 1023 struct smc_link *to_lnk = NULL; 1024 struct smc_cdc_tx_pend *pend; 1025 struct smc_connection *conn; 1026 struct smc_wr_buf *wr_buf; 1027 struct smc_sock *smc; 1028 struct rb_node *node; 1029 int i, rc = 0; 1030 1031 /* link is inactive, wake up tx waiters */ 1032 smc_wr_wakeup_tx_wait(from_lnk); 1033 1034 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1035 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1036 continue; 1037 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1038 from_lnk->ibport == lgr->lnk[i].ibport) { 1039 continue; 1040 } 1041 to_lnk = &lgr->lnk[i]; 1042 break; 1043 } 1044 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1045 smc_lgr_terminate_sched(lgr); 1046 return NULL; 1047 } 1048 again: 1049 read_lock_bh(&lgr->conns_lock); 1050 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1051 conn = rb_entry(node, struct smc_connection, alert_node); 1052 if (conn->lnk != from_lnk) 1053 continue; 1054 smc = container_of(conn, struct smc_sock, conn); 1055 /* conn->lnk not yet set in SMC_INIT state */ 1056 if (smc->sk.sk_state == SMC_INIT) 1057 continue; 1058 if (smc->sk.sk_state == SMC_CLOSED || 1059 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1060 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1061 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1062 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1063 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1064 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1065 smc->sk.sk_state == SMC_PEERABORTWAIT || 1066 smc->sk.sk_state == SMC_PROCESSABORT) { 1067 spin_lock_bh(&conn->send_lock); 1068 smc_switch_link_and_count(conn, to_lnk); 1069 spin_unlock_bh(&conn->send_lock); 1070 continue; 1071 } 1072 sock_hold(&smc->sk); 1073 read_unlock_bh(&lgr->conns_lock); 1074 /* pre-fetch buffer outside of send_lock, might sleep */ 1075 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1076 if (rc) 1077 goto err_out; 1078 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1079 spin_lock_bh(&conn->send_lock); 1080 smc_switch_link_and_count(conn, to_lnk); 1081 rc = smc_switch_cursor(smc, pend, wr_buf); 1082 spin_unlock_bh(&conn->send_lock); 1083 sock_put(&smc->sk); 1084 if (rc) 1085 goto err_out; 1086 goto again; 1087 } 1088 read_unlock_bh(&lgr->conns_lock); 1089 smc_wr_tx_link_put(to_lnk); 1090 return to_lnk; 1091 1092 err_out: 1093 smcr_link_down_cond_sched(to_lnk); 1094 smc_wr_tx_link_put(to_lnk); 1095 return NULL; 1096 } 1097 1098 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1099 struct smc_link_group *lgr) 1100 { 1101 struct rw_semaphore *lock; /* lock buffer list */ 1102 int rc; 1103 1104 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1105 /* unregister rmb with peer */ 1106 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1107 if (!rc) { 1108 /* protect against smc_llc_cli_rkey_exchange() */ 1109 down_read(&lgr->llc_conf_mutex); 1110 smc_llc_do_delete_rkey(lgr, buf_desc); 1111 buf_desc->is_conf_rkey = false; 1112 up_read(&lgr->llc_conf_mutex); 1113 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1114 } 1115 } 1116 1117 if (buf_desc->is_reg_err) { 1118 /* buf registration failed, reuse not possible */ 1119 lock = is_rmb ? &lgr->rmbs_lock : 1120 &lgr->sndbufs_lock; 1121 down_write(lock); 1122 list_del(&buf_desc->list); 1123 up_write(lock); 1124 1125 smc_buf_free(lgr, is_rmb, buf_desc); 1126 } else { 1127 /* memzero_explicit provides potential memory barrier semantics */ 1128 memzero_explicit(buf_desc->cpu_addr, buf_desc->len); 1129 WRITE_ONCE(buf_desc->used, 0); 1130 } 1131 } 1132 1133 static void smc_buf_unuse(struct smc_connection *conn, 1134 struct smc_link_group *lgr) 1135 { 1136 if (conn->sndbuf_desc) { 1137 if (!lgr->is_smcd && conn->sndbuf_desc->is_vm) { 1138 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1139 } else { 1140 memzero_explicit(conn->sndbuf_desc->cpu_addr, conn->sndbuf_desc->len); 1141 WRITE_ONCE(conn->sndbuf_desc->used, 0); 1142 } 1143 } 1144 if (conn->rmb_desc) { 1145 if (!lgr->is_smcd) { 1146 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1147 } else { 1148 memzero_explicit(conn->rmb_desc->cpu_addr, 1149 conn->rmb_desc->len + sizeof(struct smcd_cdc_msg)); 1150 WRITE_ONCE(conn->rmb_desc->used, 0); 1151 } 1152 } 1153 } 1154 1155 /* remove a finished connection from its link group */ 1156 void smc_conn_free(struct smc_connection *conn) 1157 { 1158 struct smc_link_group *lgr = conn->lgr; 1159 1160 if (!lgr || conn->freed) 1161 /* Connection has never been registered in a 1162 * link group, or has already been freed. 1163 */ 1164 return; 1165 1166 conn->freed = 1; 1167 if (!smc_conn_lgr_valid(conn)) 1168 /* Connection has already unregistered from 1169 * link group. 1170 */ 1171 goto lgr_put; 1172 1173 if (lgr->is_smcd) { 1174 if (!list_empty(&lgr->list)) 1175 smc_ism_unset_conn(conn); 1176 tasklet_kill(&conn->rx_tsklet); 1177 } else { 1178 smc_cdc_wait_pend_tx_wr(conn); 1179 if (current_work() != &conn->abort_work) 1180 cancel_work_sync(&conn->abort_work); 1181 } 1182 if (!list_empty(&lgr->list)) { 1183 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1184 smc_lgr_unregister_conn(conn); 1185 } 1186 1187 if (!lgr->conns_num) 1188 smc_lgr_schedule_free_work(lgr); 1189 lgr_put: 1190 if (!lgr->is_smcd) 1191 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1192 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1193 } 1194 1195 /* unregister a link from a buf_desc */ 1196 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1197 struct smc_link *lnk) 1198 { 1199 if (is_rmb || buf_desc->is_vm) 1200 buf_desc->is_reg_mr[lnk->link_idx] = false; 1201 if (!buf_desc->is_map_ib[lnk->link_idx]) 1202 return; 1203 1204 if ((is_rmb || buf_desc->is_vm) && 1205 buf_desc->mr[lnk->link_idx]) { 1206 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1207 buf_desc->mr[lnk->link_idx] = NULL; 1208 } 1209 if (is_rmb) 1210 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1211 else 1212 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1213 1214 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1215 buf_desc->is_map_ib[lnk->link_idx] = false; 1216 } 1217 1218 /* unmap all buffers of lgr for a deleted link */ 1219 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1220 { 1221 struct smc_link_group *lgr = lnk->lgr; 1222 struct smc_buf_desc *buf_desc, *bf; 1223 int i; 1224 1225 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1226 down_write(&lgr->rmbs_lock); 1227 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1228 smcr_buf_unmap_link(buf_desc, true, lnk); 1229 up_write(&lgr->rmbs_lock); 1230 1231 down_write(&lgr->sndbufs_lock); 1232 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1233 list) 1234 smcr_buf_unmap_link(buf_desc, false, lnk); 1235 up_write(&lgr->sndbufs_lock); 1236 } 1237 } 1238 1239 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1240 { 1241 struct smc_link_group *lgr = lnk->lgr; 1242 int i; 1243 1244 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1245 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1246 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1247 } 1248 } 1249 1250 static void __smcr_link_clear(struct smc_link *lnk) 1251 { 1252 struct smc_link_group *lgr = lnk->lgr; 1253 struct smc_ib_device *smcibdev; 1254 1255 smc_wr_free_link_mem(lnk); 1256 smc_ibdev_cnt_dec(lnk); 1257 put_device(&lnk->smcibdev->ibdev->dev); 1258 smcibdev = lnk->smcibdev; 1259 memset(lnk, 0, sizeof(struct smc_link)); 1260 lnk->state = SMC_LNK_UNUSED; 1261 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1262 wake_up(&smcibdev->lnks_deleted); 1263 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1264 } 1265 1266 /* must be called under lgr->llc_conf_mutex lock */ 1267 void smcr_link_clear(struct smc_link *lnk, bool log) 1268 { 1269 if (!lnk->lgr || lnk->clearing || 1270 lnk->state == SMC_LNK_UNUSED) 1271 return; 1272 lnk->clearing = 1; 1273 lnk->peer_qpn = 0; 1274 smc_llc_link_clear(lnk, log); 1275 smcr_buf_unmap_lgr(lnk); 1276 smcr_rtoken_clear_link(lnk); 1277 smc_ib_modify_qp_error(lnk); 1278 smc_wr_free_link(lnk); 1279 smc_ib_destroy_queue_pair(lnk); 1280 smc_ib_dealloc_protection_domain(lnk); 1281 smcr_link_put(lnk); /* theoretically last link_put */ 1282 } 1283 1284 void smcr_link_hold(struct smc_link *lnk) 1285 { 1286 refcount_inc(&lnk->refcnt); 1287 } 1288 1289 void smcr_link_put(struct smc_link *lnk) 1290 { 1291 if (refcount_dec_and_test(&lnk->refcnt)) 1292 __smcr_link_clear(lnk); 1293 } 1294 1295 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1296 struct smc_buf_desc *buf_desc) 1297 { 1298 int i; 1299 1300 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1301 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1302 1303 if (!buf_desc->is_vm && buf_desc->pages) 1304 __free_pages(buf_desc->pages, buf_desc->order); 1305 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1306 vfree(buf_desc->cpu_addr); 1307 kfree(buf_desc); 1308 } 1309 1310 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1311 struct smc_buf_desc *buf_desc) 1312 { 1313 if (is_dmb) { 1314 /* restore original buf len */ 1315 buf_desc->len += sizeof(struct smcd_cdc_msg); 1316 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1317 } else { 1318 kfree(buf_desc->cpu_addr); 1319 } 1320 kfree(buf_desc); 1321 } 1322 1323 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1324 struct smc_buf_desc *buf_desc) 1325 { 1326 if (lgr->is_smcd) 1327 smcd_buf_free(lgr, is_rmb, buf_desc); 1328 else 1329 smcr_buf_free(lgr, is_rmb, buf_desc); 1330 } 1331 1332 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1333 { 1334 struct smc_buf_desc *buf_desc, *bf_desc; 1335 struct list_head *buf_list; 1336 int i; 1337 1338 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1339 if (is_rmb) 1340 buf_list = &lgr->rmbs[i]; 1341 else 1342 buf_list = &lgr->sndbufs[i]; 1343 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1344 list) { 1345 list_del(&buf_desc->list); 1346 smc_buf_free(lgr, is_rmb, buf_desc); 1347 } 1348 } 1349 } 1350 1351 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1352 { 1353 /* free send buffers */ 1354 __smc_lgr_free_bufs(lgr, false); 1355 /* free rmbs */ 1356 __smc_lgr_free_bufs(lgr, true); 1357 } 1358 1359 /* won't be freed until no one accesses to lgr anymore */ 1360 static void __smc_lgr_free(struct smc_link_group *lgr) 1361 { 1362 smc_lgr_free_bufs(lgr); 1363 if (lgr->is_smcd) { 1364 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1365 wake_up(&lgr->smcd->lgrs_deleted); 1366 } else { 1367 smc_wr_free_lgr_mem(lgr); 1368 if (!atomic_dec_return(&lgr_cnt)) 1369 wake_up(&lgrs_deleted); 1370 } 1371 kfree(lgr); 1372 } 1373 1374 /* remove a link group */ 1375 static void smc_lgr_free(struct smc_link_group *lgr) 1376 { 1377 int i; 1378 1379 if (!lgr->is_smcd) { 1380 down_write(&lgr->llc_conf_mutex); 1381 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1382 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1383 smcr_link_clear(&lgr->lnk[i], false); 1384 } 1385 up_write(&lgr->llc_conf_mutex); 1386 smc_llc_lgr_clear(lgr); 1387 } 1388 1389 destroy_workqueue(lgr->tx_wq); 1390 if (lgr->is_smcd) { 1391 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1392 put_device(lgr->smcd->ops->get_dev(lgr->smcd)); 1393 } 1394 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1395 } 1396 1397 void smc_lgr_hold(struct smc_link_group *lgr) 1398 { 1399 refcount_inc(&lgr->refcnt); 1400 } 1401 1402 void smc_lgr_put(struct smc_link_group *lgr) 1403 { 1404 if (refcount_dec_and_test(&lgr->refcnt)) 1405 __smc_lgr_free(lgr); 1406 } 1407 1408 static void smc_sk_wake_ups(struct smc_sock *smc) 1409 { 1410 smc->sk.sk_write_space(&smc->sk); 1411 smc->sk.sk_data_ready(&smc->sk); 1412 smc->sk.sk_state_change(&smc->sk); 1413 } 1414 1415 /* kill a connection */ 1416 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1417 { 1418 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1419 1420 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1421 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1422 else 1423 smc_close_abort(conn); 1424 conn->killed = 1; 1425 smc->sk.sk_err = ECONNABORTED; 1426 smc_sk_wake_ups(smc); 1427 if (conn->lgr->is_smcd) { 1428 smc_ism_unset_conn(conn); 1429 if (soft) 1430 tasklet_kill(&conn->rx_tsklet); 1431 else 1432 tasklet_unlock_wait(&conn->rx_tsklet); 1433 } else { 1434 smc_cdc_wait_pend_tx_wr(conn); 1435 } 1436 smc_lgr_unregister_conn(conn); 1437 smc_close_active_abort(smc); 1438 } 1439 1440 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1441 { 1442 if (lgr->is_smcd) { 1443 smc_ism_signal_shutdown(lgr); 1444 } else { 1445 u32 rsn = lgr->llc_termination_rsn; 1446 1447 if (!rsn) 1448 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1449 smc_llc_send_link_delete_all(lgr, false, rsn); 1450 smcr_lgr_link_deactivate_all(lgr); 1451 } 1452 } 1453 1454 /* terminate link group 1455 * @soft: true if link group shutdown can take its time 1456 * false if immediate link group shutdown is required 1457 */ 1458 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1459 { 1460 struct smc_connection *conn; 1461 struct smc_sock *smc; 1462 struct rb_node *node; 1463 1464 if (lgr->terminating) 1465 return; /* lgr already terminating */ 1466 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1467 cancel_delayed_work(&lgr->free_work); 1468 lgr->terminating = 1; 1469 1470 /* kill remaining link group connections */ 1471 read_lock_bh(&lgr->conns_lock); 1472 node = rb_first(&lgr->conns_all); 1473 while (node) { 1474 read_unlock_bh(&lgr->conns_lock); 1475 conn = rb_entry(node, struct smc_connection, alert_node); 1476 smc = container_of(conn, struct smc_sock, conn); 1477 sock_hold(&smc->sk); /* sock_put below */ 1478 lock_sock(&smc->sk); 1479 smc_conn_kill(conn, soft); 1480 release_sock(&smc->sk); 1481 sock_put(&smc->sk); /* sock_hold above */ 1482 read_lock_bh(&lgr->conns_lock); 1483 node = rb_first(&lgr->conns_all); 1484 } 1485 read_unlock_bh(&lgr->conns_lock); 1486 smc_lgr_cleanup(lgr); 1487 smc_lgr_free(lgr); 1488 } 1489 1490 /* unlink link group and schedule termination */ 1491 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1492 { 1493 spinlock_t *lgr_lock; 1494 1495 smc_lgr_list_head(lgr, &lgr_lock); 1496 spin_lock_bh(lgr_lock); 1497 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1498 spin_unlock_bh(lgr_lock); 1499 return; /* lgr already terminating */ 1500 } 1501 list_del_init(&lgr->list); 1502 lgr->freeing = 1; 1503 spin_unlock_bh(lgr_lock); 1504 schedule_work(&lgr->terminate_work); 1505 } 1506 1507 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1508 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan) 1509 { 1510 struct smc_link_group *lgr, *l; 1511 LIST_HEAD(lgr_free_list); 1512 1513 /* run common cleanup function and build free list */ 1514 spin_lock_bh(&dev->lgr_lock); 1515 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1516 if ((!peer_gid || lgr->peer_gid == peer_gid) && 1517 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1518 if (peer_gid) /* peer triggered termination */ 1519 lgr->peer_shutdown = 1; 1520 list_move(&lgr->list, &lgr_free_list); 1521 lgr->freeing = 1; 1522 } 1523 } 1524 spin_unlock_bh(&dev->lgr_lock); 1525 1526 /* cancel the regular free workers and actually free lgrs */ 1527 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1528 list_del_init(&lgr->list); 1529 schedule_work(&lgr->terminate_work); 1530 } 1531 } 1532 1533 /* Called when an SMCD device is removed or the smc module is unloaded */ 1534 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1535 { 1536 struct smc_link_group *lgr, *lg; 1537 LIST_HEAD(lgr_free_list); 1538 1539 spin_lock_bh(&smcd->lgr_lock); 1540 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1541 list_for_each_entry(lgr, &lgr_free_list, list) 1542 lgr->freeing = 1; 1543 spin_unlock_bh(&smcd->lgr_lock); 1544 1545 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1546 list_del_init(&lgr->list); 1547 __smc_lgr_terminate(lgr, false); 1548 } 1549 1550 if (atomic_read(&smcd->lgr_cnt)) 1551 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1552 } 1553 1554 /* Called when an SMCR device is removed or the smc module is unloaded. 1555 * If smcibdev is given, all SMCR link groups using this device are terminated. 1556 * If smcibdev is NULL, all SMCR link groups are terminated. 1557 */ 1558 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1559 { 1560 struct smc_link_group *lgr, *lg; 1561 LIST_HEAD(lgr_free_list); 1562 int i; 1563 1564 spin_lock_bh(&smc_lgr_list.lock); 1565 if (!smcibdev) { 1566 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1567 list_for_each_entry(lgr, &lgr_free_list, list) 1568 lgr->freeing = 1; 1569 } else { 1570 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1571 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1572 if (lgr->lnk[i].smcibdev == smcibdev) 1573 smcr_link_down_cond_sched(&lgr->lnk[i]); 1574 } 1575 } 1576 } 1577 spin_unlock_bh(&smc_lgr_list.lock); 1578 1579 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1580 list_del_init(&lgr->list); 1581 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1582 __smc_lgr_terminate(lgr, false); 1583 } 1584 1585 if (smcibdev) { 1586 if (atomic_read(&smcibdev->lnk_cnt)) 1587 wait_event(smcibdev->lnks_deleted, 1588 !atomic_read(&smcibdev->lnk_cnt)); 1589 } else { 1590 if (atomic_read(&lgr_cnt)) 1591 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1592 } 1593 } 1594 1595 /* set new lgr type and clear all asymmetric link tagging */ 1596 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1597 { 1598 char *lgr_type = ""; 1599 int i; 1600 1601 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1602 if (smc_link_usable(&lgr->lnk[i])) 1603 lgr->lnk[i].link_is_asym = false; 1604 if (lgr->type == new_type) 1605 return; 1606 lgr->type = new_type; 1607 1608 switch (lgr->type) { 1609 case SMC_LGR_NONE: 1610 lgr_type = "NONE"; 1611 break; 1612 case SMC_LGR_SINGLE: 1613 lgr_type = "SINGLE"; 1614 break; 1615 case SMC_LGR_SYMMETRIC: 1616 lgr_type = "SYMMETRIC"; 1617 break; 1618 case SMC_LGR_ASYMMETRIC_PEER: 1619 lgr_type = "ASYMMETRIC_PEER"; 1620 break; 1621 case SMC_LGR_ASYMMETRIC_LOCAL: 1622 lgr_type = "ASYMMETRIC_LOCAL"; 1623 break; 1624 } 1625 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1626 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1627 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1628 } 1629 1630 /* set new lgr type and tag a link as asymmetric */ 1631 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1632 enum smc_lgr_type new_type, int asym_lnk_idx) 1633 { 1634 smcr_lgr_set_type(lgr, new_type); 1635 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1636 } 1637 1638 /* abort connection, abort_work scheduled from tasklet context */ 1639 static void smc_conn_abort_work(struct work_struct *work) 1640 { 1641 struct smc_connection *conn = container_of(work, 1642 struct smc_connection, 1643 abort_work); 1644 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1645 1646 lock_sock(&smc->sk); 1647 smc_conn_kill(conn, true); 1648 release_sock(&smc->sk); 1649 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1650 } 1651 1652 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1653 { 1654 struct smc_link_group *lgr, *n; 1655 1656 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1657 struct smc_link *link; 1658 1659 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1660 SMC_MAX_PNETID_LEN) || 1661 lgr->type == SMC_LGR_SYMMETRIC || 1662 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1663 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1664 continue; 1665 1666 /* trigger local add link processing */ 1667 link = smc_llc_usable_link(lgr); 1668 if (link) 1669 smc_llc_add_link_local(link); 1670 } 1671 } 1672 1673 /* link is down - switch connections to alternate link, 1674 * must be called under lgr->llc_conf_mutex lock 1675 */ 1676 static void smcr_link_down(struct smc_link *lnk) 1677 { 1678 struct smc_link_group *lgr = lnk->lgr; 1679 struct smc_link *to_lnk; 1680 int del_link_id; 1681 1682 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1683 return; 1684 1685 to_lnk = smc_switch_conns(lgr, lnk, true); 1686 if (!to_lnk) { /* no backup link available */ 1687 smcr_link_clear(lnk, true); 1688 return; 1689 } 1690 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1691 del_link_id = lnk->link_id; 1692 1693 if (lgr->role == SMC_SERV) { 1694 /* trigger local delete link processing */ 1695 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1696 } else { 1697 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1698 /* another llc task is ongoing */ 1699 up_write(&lgr->llc_conf_mutex); 1700 wait_event_timeout(lgr->llc_flow_waiter, 1701 (list_empty(&lgr->list) || 1702 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1703 SMC_LLC_WAIT_TIME); 1704 down_write(&lgr->llc_conf_mutex); 1705 } 1706 if (!list_empty(&lgr->list)) { 1707 smc_llc_send_delete_link(to_lnk, del_link_id, 1708 SMC_LLC_REQ, true, 1709 SMC_LLC_DEL_LOST_PATH); 1710 smcr_link_clear(lnk, true); 1711 } 1712 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1713 } 1714 } 1715 1716 /* must be called under lgr->llc_conf_mutex lock */ 1717 void smcr_link_down_cond(struct smc_link *lnk) 1718 { 1719 if (smc_link_downing(&lnk->state)) { 1720 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1721 smcr_link_down(lnk); 1722 } 1723 } 1724 1725 /* will get the lgr->llc_conf_mutex lock */ 1726 void smcr_link_down_cond_sched(struct smc_link *lnk) 1727 { 1728 if (smc_link_downing(&lnk->state)) { 1729 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1730 schedule_work(&lnk->link_down_wrk); 1731 } 1732 } 1733 1734 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1735 { 1736 struct smc_link_group *lgr, *n; 1737 int i; 1738 1739 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1740 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1741 SMC_MAX_PNETID_LEN)) 1742 continue; /* lgr is not affected */ 1743 if (list_empty(&lgr->list)) 1744 continue; 1745 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1746 struct smc_link *lnk = &lgr->lnk[i]; 1747 1748 if (smc_link_usable(lnk) && 1749 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1750 smcr_link_down_cond_sched(lnk); 1751 } 1752 } 1753 } 1754 1755 static void smc_link_down_work(struct work_struct *work) 1756 { 1757 struct smc_link *link = container_of(work, struct smc_link, 1758 link_down_wrk); 1759 struct smc_link_group *lgr = link->lgr; 1760 1761 if (list_empty(&lgr->list)) 1762 return; 1763 wake_up_all(&lgr->llc_msg_waiter); 1764 down_write(&lgr->llc_conf_mutex); 1765 smcr_link_down(link); 1766 up_write(&lgr->llc_conf_mutex); 1767 } 1768 1769 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1770 struct netdev_nested_priv *priv) 1771 { 1772 unsigned short *vlan_id = (unsigned short *)priv->data; 1773 1774 if (is_vlan_dev(lower_dev)) { 1775 *vlan_id = vlan_dev_vlan_id(lower_dev); 1776 return 1; 1777 } 1778 1779 return 0; 1780 } 1781 1782 /* Determine vlan of internal TCP socket. */ 1783 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1784 { 1785 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1786 struct netdev_nested_priv priv; 1787 struct net_device *ndev; 1788 int rc = 0; 1789 1790 ini->vlan_id = 0; 1791 if (!dst) { 1792 rc = -ENOTCONN; 1793 goto out; 1794 } 1795 if (!dst->dev) { 1796 rc = -ENODEV; 1797 goto out_rel; 1798 } 1799 1800 ndev = dst->dev; 1801 if (is_vlan_dev(ndev)) { 1802 ini->vlan_id = vlan_dev_vlan_id(ndev); 1803 goto out_rel; 1804 } 1805 1806 priv.data = (void *)&ini->vlan_id; 1807 rtnl_lock(); 1808 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1809 rtnl_unlock(); 1810 1811 out_rel: 1812 dst_release(dst); 1813 out: 1814 return rc; 1815 } 1816 1817 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1818 u8 peer_systemid[], 1819 u8 peer_gid[], 1820 u8 peer_mac_v1[], 1821 enum smc_lgr_role role, u32 clcqpn, 1822 struct net *net) 1823 { 1824 struct smc_link *lnk; 1825 int i; 1826 1827 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1828 lgr->role != role) 1829 return false; 1830 1831 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1832 lnk = &lgr->lnk[i]; 1833 1834 if (!smc_link_active(lnk)) 1835 continue; 1836 /* use verbs API to check netns, instead of lgr->net */ 1837 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1838 return false; 1839 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1840 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1841 (smcr_version == SMC_V2 || 1842 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1843 return true; 1844 } 1845 return false; 1846 } 1847 1848 static bool smcd_lgr_match(struct smc_link_group *lgr, 1849 struct smcd_dev *smcismdev, u64 peer_gid) 1850 { 1851 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; 1852 } 1853 1854 /* create a new SMC connection (and a new link group if necessary) */ 1855 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1856 { 1857 struct smc_connection *conn = &smc->conn; 1858 struct net *net = sock_net(&smc->sk); 1859 struct list_head *lgr_list; 1860 struct smc_link_group *lgr; 1861 enum smc_lgr_role role; 1862 spinlock_t *lgr_lock; 1863 int rc = 0; 1864 1865 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1866 &smc_lgr_list.list; 1867 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1868 &smc_lgr_list.lock; 1869 ini->first_contact_local = 1; 1870 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1871 if (role == SMC_CLNT && ini->first_contact_peer) 1872 /* create new link group as well */ 1873 goto create; 1874 1875 /* determine if an existing link group can be reused */ 1876 spin_lock_bh(lgr_lock); 1877 list_for_each_entry(lgr, lgr_list, list) { 1878 write_lock_bh(&lgr->conns_lock); 1879 if ((ini->is_smcd ? 1880 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1881 ini->ism_peer_gid[ini->ism_selected]) : 1882 smcr_lgr_match(lgr, ini->smcr_version, 1883 ini->peer_systemid, 1884 ini->peer_gid, ini->peer_mac, role, 1885 ini->ib_clcqpn, net)) && 1886 !lgr->sync_err && 1887 (ini->smcd_version == SMC_V2 || 1888 lgr->vlan_id == ini->vlan_id) && 1889 (role == SMC_CLNT || ini->is_smcd || 1890 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX && 1891 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1892 /* link group found */ 1893 ini->first_contact_local = 0; 1894 conn->lgr = lgr; 1895 rc = smc_lgr_register_conn(conn, false); 1896 write_unlock_bh(&lgr->conns_lock); 1897 if (!rc && delayed_work_pending(&lgr->free_work)) 1898 cancel_delayed_work(&lgr->free_work); 1899 break; 1900 } 1901 write_unlock_bh(&lgr->conns_lock); 1902 } 1903 spin_unlock_bh(lgr_lock); 1904 if (rc) 1905 return rc; 1906 1907 if (role == SMC_CLNT && !ini->first_contact_peer && 1908 ini->first_contact_local) { 1909 /* Server reuses a link group, but Client wants to start 1910 * a new one 1911 * send out_of_sync decline, reason synchr. error 1912 */ 1913 return SMC_CLC_DECL_SYNCERR; 1914 } 1915 1916 create: 1917 if (ini->first_contact_local) { 1918 rc = smc_lgr_create(smc, ini); 1919 if (rc) 1920 goto out; 1921 lgr = conn->lgr; 1922 write_lock_bh(&lgr->conns_lock); 1923 rc = smc_lgr_register_conn(conn, true); 1924 write_unlock_bh(&lgr->conns_lock); 1925 if (rc) { 1926 smc_lgr_cleanup_early(lgr); 1927 goto out; 1928 } 1929 } 1930 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 1931 if (!conn->lgr->is_smcd) 1932 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 1933 conn->freed = 0; 1934 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 1935 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 1936 conn->urg_state = SMC_URG_READ; 1937 init_waitqueue_head(&conn->cdc_pend_tx_wq); 1938 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 1939 if (ini->is_smcd) { 1940 conn->rx_off = sizeof(struct smcd_cdc_msg); 1941 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 1942 } else { 1943 conn->rx_off = 0; 1944 } 1945 #ifndef KERNEL_HAS_ATOMIC64 1946 spin_lock_init(&conn->acurs_lock); 1947 #endif 1948 1949 out: 1950 return rc; 1951 } 1952 1953 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 1954 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */ 1955 1956 /* convert the RMB size into the compressed notation (minimum 16K, see 1957 * SMCD/R_DMBE_SIZES. 1958 * In contrast to plain ilog2, this rounds towards the next power of 2, 1959 * so the socket application gets at least its desired sndbuf / rcvbuf size. 1960 */ 1961 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 1962 { 1963 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE; 1964 u8 compressed; 1965 1966 if (size <= SMC_BUF_MIN_SIZE) 1967 return 0; 1968 1969 size = (size - 1) >> 14; /* convert to 16K multiple */ 1970 compressed = min_t(u8, ilog2(size) + 1, 1971 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 1972 1973 if (!is_smcd && is_rmb) 1974 /* RMBs are backed by & limited to max size of scatterlists */ 1975 compressed = min_t(u8, compressed, ilog2(max_scat >> 14)); 1976 1977 return compressed; 1978 } 1979 1980 /* convert the RMB size from compressed notation into integer */ 1981 int smc_uncompress_bufsize(u8 compressed) 1982 { 1983 u32 size; 1984 1985 size = 0x00000001 << (((int)compressed) + 14); 1986 return (int)size; 1987 } 1988 1989 /* try to reuse a sndbuf or rmb description slot for a certain 1990 * buffer size; if not available, return NULL 1991 */ 1992 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 1993 struct rw_semaphore *lock, 1994 struct list_head *buf_list) 1995 { 1996 struct smc_buf_desc *buf_slot; 1997 1998 down_read(lock); 1999 list_for_each_entry(buf_slot, buf_list, list) { 2000 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 2001 up_read(lock); 2002 return buf_slot; 2003 } 2004 } 2005 up_read(lock); 2006 return NULL; 2007 } 2008 2009 /* one of the conditions for announcing a receiver's current window size is 2010 * that it "results in a minimum increase in the window size of 10% of the 2011 * receive buffer space" [RFC7609] 2012 */ 2013 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2014 { 2015 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2016 } 2017 2018 /* map an buf to a link */ 2019 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2020 struct smc_link *lnk) 2021 { 2022 int rc, i, nents, offset, buf_size, size, access_flags; 2023 struct scatterlist *sg; 2024 void *buf; 2025 2026 if (buf_desc->is_map_ib[lnk->link_idx]) 2027 return 0; 2028 2029 if (buf_desc->is_vm) { 2030 buf = buf_desc->cpu_addr; 2031 buf_size = buf_desc->len; 2032 offset = offset_in_page(buf_desc->cpu_addr); 2033 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2034 } else { 2035 nents = 1; 2036 } 2037 2038 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2039 if (rc) 2040 return rc; 2041 2042 if (buf_desc->is_vm) { 2043 /* virtually contiguous buffer */ 2044 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2045 size = min_t(int, PAGE_SIZE - offset, buf_size); 2046 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2047 buf += size / sizeof(*buf); 2048 buf_size -= size; 2049 offset = 0; 2050 } 2051 } else { 2052 /* physically contiguous buffer */ 2053 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2054 buf_desc->cpu_addr, buf_desc->len); 2055 } 2056 2057 /* map sg table to DMA address */ 2058 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2059 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2060 /* SMC protocol depends on mapping to one DMA address only */ 2061 if (rc != nents) { 2062 rc = -EAGAIN; 2063 goto free_table; 2064 } 2065 2066 buf_desc->is_dma_need_sync |= 2067 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2068 2069 if (is_rmb || buf_desc->is_vm) { 2070 /* create a new memory region for the RMB or vzalloced sndbuf */ 2071 access_flags = is_rmb ? 2072 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2073 IB_ACCESS_LOCAL_WRITE; 2074 2075 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2076 buf_desc, lnk->link_idx); 2077 if (rc) 2078 goto buf_unmap; 2079 smc_ib_sync_sg_for_device(lnk, buf_desc, 2080 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2081 } 2082 buf_desc->is_map_ib[lnk->link_idx] = true; 2083 return 0; 2084 2085 buf_unmap: 2086 smc_ib_buf_unmap_sg(lnk, buf_desc, 2087 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2088 free_table: 2089 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2090 return rc; 2091 } 2092 2093 /* register a new buf on IB device, rmb or vzalloced sndbuf 2094 * must be called under lgr->llc_conf_mutex lock 2095 */ 2096 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2097 { 2098 if (list_empty(&link->lgr->list)) 2099 return -ENOLINK; 2100 if (!buf_desc->is_reg_mr[link->link_idx]) { 2101 /* register memory region for new buf */ 2102 if (buf_desc->is_vm) 2103 buf_desc->mr[link->link_idx]->iova = 2104 (uintptr_t)buf_desc->cpu_addr; 2105 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2106 buf_desc->is_reg_err = true; 2107 return -EFAULT; 2108 } 2109 buf_desc->is_reg_mr[link->link_idx] = true; 2110 } 2111 return 0; 2112 } 2113 2114 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct rw_semaphore *lock, 2115 struct list_head *lst, bool is_rmb) 2116 { 2117 struct smc_buf_desc *buf_desc, *bf; 2118 int rc = 0; 2119 2120 down_write(lock); 2121 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2122 if (!buf_desc->used) 2123 continue; 2124 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2125 if (rc) 2126 goto out; 2127 } 2128 out: 2129 up_write(lock); 2130 return rc; 2131 } 2132 2133 /* map all used buffers of lgr for a new link */ 2134 int smcr_buf_map_lgr(struct smc_link *lnk) 2135 { 2136 struct smc_link_group *lgr = lnk->lgr; 2137 int i, rc = 0; 2138 2139 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2140 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2141 &lgr->rmbs[i], true); 2142 if (rc) 2143 return rc; 2144 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2145 &lgr->sndbufs[i], false); 2146 if (rc) 2147 return rc; 2148 } 2149 return 0; 2150 } 2151 2152 /* register all used buffers of lgr for a new link, 2153 * must be called under lgr->llc_conf_mutex lock 2154 */ 2155 int smcr_buf_reg_lgr(struct smc_link *lnk) 2156 { 2157 struct smc_link_group *lgr = lnk->lgr; 2158 struct smc_buf_desc *buf_desc, *bf; 2159 int i, rc = 0; 2160 2161 /* reg all RMBs for a new link */ 2162 down_write(&lgr->rmbs_lock); 2163 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2164 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2165 if (!buf_desc->used) 2166 continue; 2167 rc = smcr_link_reg_buf(lnk, buf_desc); 2168 if (rc) { 2169 up_write(&lgr->rmbs_lock); 2170 return rc; 2171 } 2172 } 2173 } 2174 up_write(&lgr->rmbs_lock); 2175 2176 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2177 return rc; 2178 2179 /* reg all vzalloced sndbufs for a new link */ 2180 down_write(&lgr->sndbufs_lock); 2181 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2182 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2183 if (!buf_desc->used || !buf_desc->is_vm) 2184 continue; 2185 rc = smcr_link_reg_buf(lnk, buf_desc); 2186 if (rc) { 2187 up_write(&lgr->sndbufs_lock); 2188 return rc; 2189 } 2190 } 2191 } 2192 up_write(&lgr->sndbufs_lock); 2193 return rc; 2194 } 2195 2196 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2197 bool is_rmb, int bufsize) 2198 { 2199 struct smc_buf_desc *buf_desc; 2200 2201 /* try to alloc a new buffer */ 2202 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2203 if (!buf_desc) 2204 return ERR_PTR(-ENOMEM); 2205 2206 switch (lgr->buf_type) { 2207 case SMCR_PHYS_CONT_BUFS: 2208 case SMCR_MIXED_BUFS: 2209 buf_desc->order = get_order(bufsize); 2210 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2211 __GFP_NOMEMALLOC | __GFP_COMP | 2212 __GFP_NORETRY | __GFP_ZERO, 2213 buf_desc->order); 2214 if (buf_desc->pages) { 2215 buf_desc->cpu_addr = 2216 (void *)page_address(buf_desc->pages); 2217 buf_desc->len = bufsize; 2218 buf_desc->is_vm = false; 2219 break; 2220 } 2221 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2222 goto out; 2223 fallthrough; // try virtually continguous buf 2224 case SMCR_VIRT_CONT_BUFS: 2225 buf_desc->order = get_order(bufsize); 2226 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2227 if (!buf_desc->cpu_addr) 2228 goto out; 2229 buf_desc->pages = NULL; 2230 buf_desc->len = bufsize; 2231 buf_desc->is_vm = true; 2232 break; 2233 } 2234 return buf_desc; 2235 2236 out: 2237 kfree(buf_desc); 2238 return ERR_PTR(-EAGAIN); 2239 } 2240 2241 /* map buf_desc on all usable links, 2242 * unused buffers stay mapped as long as the link is up 2243 */ 2244 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2245 struct smc_buf_desc *buf_desc, bool is_rmb) 2246 { 2247 int i, rc = 0, cnt = 0; 2248 2249 /* protect against parallel link reconfiguration */ 2250 down_read(&lgr->llc_conf_mutex); 2251 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2252 struct smc_link *lnk = &lgr->lnk[i]; 2253 2254 if (!smc_link_usable(lnk)) 2255 continue; 2256 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2257 rc = -ENOMEM; 2258 goto out; 2259 } 2260 cnt++; 2261 } 2262 out: 2263 up_read(&lgr->llc_conf_mutex); 2264 if (!rc && !cnt) 2265 rc = -EINVAL; 2266 return rc; 2267 } 2268 2269 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2270 bool is_dmb, int bufsize) 2271 { 2272 struct smc_buf_desc *buf_desc; 2273 int rc; 2274 2275 /* try to alloc a new DMB */ 2276 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2277 if (!buf_desc) 2278 return ERR_PTR(-ENOMEM); 2279 if (is_dmb) { 2280 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2281 if (rc) { 2282 kfree(buf_desc); 2283 if (rc == -ENOMEM) 2284 return ERR_PTR(-EAGAIN); 2285 if (rc == -ENOSPC) 2286 return ERR_PTR(-ENOSPC); 2287 return ERR_PTR(-EIO); 2288 } 2289 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2290 /* CDC header stored in buf. So, pretend it was smaller */ 2291 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2292 } else { 2293 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2294 __GFP_NOWARN | __GFP_NORETRY | 2295 __GFP_NOMEMALLOC); 2296 if (!buf_desc->cpu_addr) { 2297 kfree(buf_desc); 2298 return ERR_PTR(-EAGAIN); 2299 } 2300 buf_desc->len = bufsize; 2301 } 2302 return buf_desc; 2303 } 2304 2305 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2306 { 2307 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2308 struct smc_connection *conn = &smc->conn; 2309 struct smc_link_group *lgr = conn->lgr; 2310 struct list_head *buf_list; 2311 int bufsize, bufsize_short; 2312 struct rw_semaphore *lock; /* lock buffer list */ 2313 bool is_dgraded = false; 2314 int sk_buf_size; 2315 2316 if (is_rmb) 2317 /* use socket recv buffer size (w/o overhead) as start value */ 2318 sk_buf_size = smc->sk.sk_rcvbuf; 2319 else 2320 /* use socket send buffer size (w/o overhead) as start value */ 2321 sk_buf_size = smc->sk.sk_sndbuf; 2322 2323 for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb); 2324 bufsize_short >= 0; bufsize_short--) { 2325 if (is_rmb) { 2326 lock = &lgr->rmbs_lock; 2327 buf_list = &lgr->rmbs[bufsize_short]; 2328 } else { 2329 lock = &lgr->sndbufs_lock; 2330 buf_list = &lgr->sndbufs[bufsize_short]; 2331 } 2332 bufsize = smc_uncompress_bufsize(bufsize_short); 2333 2334 /* check for reusable slot in the link group */ 2335 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list); 2336 if (buf_desc) { 2337 buf_desc->is_dma_need_sync = 0; 2338 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2339 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2340 break; /* found reusable slot */ 2341 } 2342 2343 if (is_smcd) 2344 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2345 else 2346 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); 2347 2348 if (PTR_ERR(buf_desc) == -ENOMEM) 2349 break; 2350 if (IS_ERR(buf_desc)) { 2351 if (!is_dgraded) { 2352 is_dgraded = true; 2353 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2354 } 2355 continue; 2356 } 2357 2358 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2359 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2360 buf_desc->used = 1; 2361 down_write(lock); 2362 list_add(&buf_desc->list, buf_list); 2363 up_write(lock); 2364 break; /* found */ 2365 } 2366 2367 if (IS_ERR(buf_desc)) 2368 return PTR_ERR(buf_desc); 2369 2370 if (!is_smcd) { 2371 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2372 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2373 return -ENOMEM; 2374 } 2375 } 2376 2377 if (is_rmb) { 2378 conn->rmb_desc = buf_desc; 2379 conn->rmbe_size_short = bufsize_short; 2380 smc->sk.sk_rcvbuf = bufsize; 2381 atomic_set(&conn->bytes_to_rcv, 0); 2382 conn->rmbe_update_limit = 2383 smc_rmb_wnd_update_limit(buf_desc->len); 2384 if (is_smcd) 2385 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2386 } else { 2387 conn->sndbuf_desc = buf_desc; 2388 smc->sk.sk_sndbuf = bufsize; 2389 atomic_set(&conn->sndbuf_space, bufsize); 2390 } 2391 return 0; 2392 } 2393 2394 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2395 { 2396 if (!conn->sndbuf_desc->is_dma_need_sync) 2397 return; 2398 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2399 !smc_link_active(conn->lnk)) 2400 return; 2401 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2402 } 2403 2404 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2405 { 2406 int i; 2407 2408 if (!conn->rmb_desc->is_dma_need_sync) 2409 return; 2410 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2411 return; 2412 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2413 if (!smc_link_active(&conn->lgr->lnk[i])) 2414 continue; 2415 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2416 DMA_FROM_DEVICE); 2417 } 2418 } 2419 2420 /* create the send and receive buffer for an SMC socket; 2421 * receive buffers are called RMBs; 2422 * (even though the SMC protocol allows more than one RMB-element per RMB, 2423 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2424 * extra RMB for every connection in a link group 2425 */ 2426 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2427 { 2428 int rc; 2429 2430 /* create send buffer */ 2431 rc = __smc_buf_create(smc, is_smcd, false); 2432 if (rc) 2433 return rc; 2434 /* create rmb */ 2435 rc = __smc_buf_create(smc, is_smcd, true); 2436 if (rc) { 2437 down_write(&smc->conn.lgr->sndbufs_lock); 2438 list_del(&smc->conn.sndbuf_desc->list); 2439 up_write(&smc->conn.lgr->sndbufs_lock); 2440 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2441 smc->conn.sndbuf_desc = NULL; 2442 } 2443 return rc; 2444 } 2445 2446 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2447 { 2448 int i; 2449 2450 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2451 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2452 return i; 2453 } 2454 return -ENOSPC; 2455 } 2456 2457 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2458 u32 rkey) 2459 { 2460 int i; 2461 2462 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2463 if (test_bit(i, lgr->rtokens_used_mask) && 2464 lgr->rtokens[i][lnk_idx].rkey == rkey) 2465 return i; 2466 } 2467 return -ENOENT; 2468 } 2469 2470 /* set rtoken for a new link to an existing rmb */ 2471 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2472 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2473 { 2474 int rtok_idx; 2475 2476 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2477 if (rtok_idx == -ENOENT) 2478 return; 2479 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2480 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2481 } 2482 2483 /* set rtoken for a new link whose link_id is given */ 2484 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2485 __be64 nw_vaddr, __be32 nw_rkey) 2486 { 2487 u64 dma_addr = be64_to_cpu(nw_vaddr); 2488 u32 rkey = ntohl(nw_rkey); 2489 bool found = false; 2490 int link_idx; 2491 2492 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2493 if (lgr->lnk[link_idx].link_id == link_id) { 2494 found = true; 2495 break; 2496 } 2497 } 2498 if (!found) 2499 return; 2500 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2501 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2502 } 2503 2504 /* add a new rtoken from peer */ 2505 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2506 { 2507 struct smc_link_group *lgr = smc_get_lgr(lnk); 2508 u64 dma_addr = be64_to_cpu(nw_vaddr); 2509 u32 rkey = ntohl(nw_rkey); 2510 int i; 2511 2512 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2513 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2514 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2515 test_bit(i, lgr->rtokens_used_mask)) { 2516 /* already in list */ 2517 return i; 2518 } 2519 } 2520 i = smc_rmb_reserve_rtoken_idx(lgr); 2521 if (i < 0) 2522 return i; 2523 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2524 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2525 return i; 2526 } 2527 2528 /* delete an rtoken from all links */ 2529 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2530 { 2531 struct smc_link_group *lgr = smc_get_lgr(lnk); 2532 u32 rkey = ntohl(nw_rkey); 2533 int i, j; 2534 2535 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2536 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2537 test_bit(i, lgr->rtokens_used_mask)) { 2538 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2539 lgr->rtokens[i][j].rkey = 0; 2540 lgr->rtokens[i][j].dma_addr = 0; 2541 } 2542 clear_bit(i, lgr->rtokens_used_mask); 2543 return 0; 2544 } 2545 } 2546 return -ENOENT; 2547 } 2548 2549 /* save rkey and dma_addr received from peer during clc handshake */ 2550 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2551 struct smc_link *lnk, 2552 struct smc_clc_msg_accept_confirm *clc) 2553 { 2554 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2555 clc->r0.rmb_rkey); 2556 if (conn->rtoken_idx < 0) 2557 return conn->rtoken_idx; 2558 return 0; 2559 } 2560 2561 static void smc_core_going_away(void) 2562 { 2563 struct smc_ib_device *smcibdev; 2564 struct smcd_dev *smcd; 2565 2566 mutex_lock(&smc_ib_devices.mutex); 2567 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2568 int i; 2569 2570 for (i = 0; i < SMC_MAX_PORTS; i++) 2571 set_bit(i, smcibdev->ports_going_away); 2572 } 2573 mutex_unlock(&smc_ib_devices.mutex); 2574 2575 mutex_lock(&smcd_dev_list.mutex); 2576 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2577 smcd->going_away = 1; 2578 } 2579 mutex_unlock(&smcd_dev_list.mutex); 2580 } 2581 2582 /* Clean up all SMC link groups */ 2583 static void smc_lgrs_shutdown(void) 2584 { 2585 struct smcd_dev *smcd; 2586 2587 smc_core_going_away(); 2588 2589 smc_smcr_terminate_all(NULL); 2590 2591 mutex_lock(&smcd_dev_list.mutex); 2592 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2593 smc_smcd_terminate_all(smcd); 2594 mutex_unlock(&smcd_dev_list.mutex); 2595 } 2596 2597 static int smc_core_reboot_event(struct notifier_block *this, 2598 unsigned long event, void *ptr) 2599 { 2600 smc_lgrs_shutdown(); 2601 smc_ib_unregister_client(); 2602 smc_ism_exit(); 2603 return 0; 2604 } 2605 2606 static struct notifier_block smc_reboot_notifier = { 2607 .notifier_call = smc_core_reboot_event, 2608 }; 2609 2610 int __init smc_core_init(void) 2611 { 2612 return register_reboot_notifier(&smc_reboot_notifier); 2613 } 2614 2615 /* Called (from smc_exit) when module is removed */ 2616 void smc_core_exit(void) 2617 { 2618 unregister_reboot_notifier(&smc_reboot_notifier); 2619 smc_lgrs_shutdown(); 2620 } 2621