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 conn->lnk = NULL; /* reset conn->lnk first */ 131 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 132 struct smc_link *lnk = &conn->lgr->lnk[i]; 133 134 if (lnk->state != expected || lnk->link_is_asym) 135 continue; 136 if (conn->lgr->role == SMC_CLNT) { 137 conn->lnk = lnk; /* temporary, SMC server assigns link*/ 138 break; 139 } 140 if (conn->lgr->conns_num % 2) { 141 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) { 142 struct smc_link *lnk2; 143 144 lnk2 = &conn->lgr->lnk[j]; 145 if (lnk2->state == expected && 146 !lnk2->link_is_asym) { 147 conn->lnk = lnk2; 148 break; 149 } 150 } 151 } 152 if (!conn->lnk) 153 conn->lnk = lnk; 154 break; 155 } 156 if (!conn->lnk) 157 return SMC_CLC_DECL_NOACTLINK; 158 atomic_inc(&conn->lnk->conn_cnt); 159 return 0; 160 } 161 162 /* Register connection in link group by assigning an alert token 163 * registered in a search tree. 164 * Requires @conns_lock 165 * Note that '0' is a reserved value and not assigned. 166 */ 167 static int smc_lgr_register_conn(struct smc_connection *conn, bool first) 168 { 169 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 170 static atomic_t nexttoken = ATOMIC_INIT(0); 171 int rc; 172 173 if (!conn->lgr->is_smcd) { 174 rc = smcr_lgr_conn_assign_link(conn, first); 175 if (rc) { 176 conn->lgr = NULL; 177 return rc; 178 } 179 } 180 /* find a new alert_token_local value not yet used by some connection 181 * in this link group 182 */ 183 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ 184 while (!conn->alert_token_local) { 185 conn->alert_token_local = atomic_inc_return(&nexttoken); 186 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) 187 conn->alert_token_local = 0; 188 } 189 smc_lgr_add_alert_token(conn); 190 conn->lgr->conns_num++; 191 return 0; 192 } 193 194 /* Unregister connection and reset the alert token of the given connection< 195 */ 196 static void __smc_lgr_unregister_conn(struct smc_connection *conn) 197 { 198 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 199 struct smc_link_group *lgr = conn->lgr; 200 201 rb_erase(&conn->alert_node, &lgr->conns_all); 202 if (conn->lnk) 203 atomic_dec(&conn->lnk->conn_cnt); 204 lgr->conns_num--; 205 conn->alert_token_local = 0; 206 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ 207 } 208 209 /* Unregister connection from lgr 210 */ 211 static void smc_lgr_unregister_conn(struct smc_connection *conn) 212 { 213 struct smc_link_group *lgr = conn->lgr; 214 215 if (!smc_conn_lgr_valid(conn)) 216 return; 217 write_lock_bh(&lgr->conns_lock); 218 if (conn->alert_token_local) { 219 __smc_lgr_unregister_conn(conn); 220 } 221 write_unlock_bh(&lgr->conns_lock); 222 } 223 224 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb) 225 { 226 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 227 char hostname[SMC_MAX_HOSTNAME_LEN + 1]; 228 char smc_seid[SMC_MAX_EID_LEN + 1]; 229 struct nlattr *attrs; 230 u8 *seid = NULL; 231 u8 *host = NULL; 232 void *nlh; 233 234 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 235 &smc_gen_nl_family, NLM_F_MULTI, 236 SMC_NETLINK_GET_SYS_INFO); 237 if (!nlh) 238 goto errmsg; 239 if (cb_ctx->pos[0]) 240 goto errout; 241 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO); 242 if (!attrs) 243 goto errout; 244 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2)) 245 goto errattr; 246 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE)) 247 goto errattr; 248 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable())) 249 goto errattr; 250 if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true)) 251 goto errattr; 252 smc_clc_get_hostname(&host); 253 if (host) { 254 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN); 255 hostname[SMC_MAX_HOSTNAME_LEN] = 0; 256 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname)) 257 goto errattr; 258 } 259 if (smc_ism_is_v2_capable()) { 260 smc_ism_get_system_eid(&seid); 261 memcpy(smc_seid, seid, SMC_MAX_EID_LEN); 262 smc_seid[SMC_MAX_EID_LEN] = 0; 263 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid)) 264 goto errattr; 265 } 266 nla_nest_end(skb, attrs); 267 genlmsg_end(skb, nlh); 268 cb_ctx->pos[0] = 1; 269 return skb->len; 270 271 errattr: 272 nla_nest_cancel(skb, attrs); 273 errout: 274 genlmsg_cancel(skb, nlh); 275 errmsg: 276 return skb->len; 277 } 278 279 /* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */ 280 static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr, 281 struct sk_buff *skb, 282 struct netlink_callback *cb, 283 struct nlattr *v2_attrs) 284 { 285 char smc_host[SMC_MAX_HOSTNAME_LEN + 1]; 286 char smc_eid[SMC_MAX_EID_LEN + 1]; 287 288 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version)) 289 goto errv2attr; 290 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release)) 291 goto errv2attr; 292 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os)) 293 goto errv2attr; 294 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN); 295 smc_host[SMC_MAX_HOSTNAME_LEN] = 0; 296 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host)) 297 goto errv2attr; 298 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN); 299 smc_eid[SMC_MAX_EID_LEN] = 0; 300 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid)) 301 goto errv2attr; 302 303 nla_nest_end(skb, v2_attrs); 304 return 0; 305 306 errv2attr: 307 nla_nest_cancel(skb, v2_attrs); 308 return -EMSGSIZE; 309 } 310 311 static int smc_nl_fill_smcr_lgr_v2(struct smc_link_group *lgr, 312 struct sk_buff *skb, 313 struct netlink_callback *cb) 314 { 315 struct nlattr *v2_attrs; 316 317 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2); 318 if (!v2_attrs) 319 goto errattr; 320 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_DIRECT, !lgr->uses_gateway)) 321 goto errv2attr; 322 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_MAX_CONNS, lgr->max_conns)) 323 goto errv2attr; 324 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_MAX_LINKS, lgr->max_links)) 325 goto errv2attr; 326 327 nla_nest_end(skb, v2_attrs); 328 return 0; 329 330 errv2attr: 331 nla_nest_cancel(skb, v2_attrs); 332 errattr: 333 return -EMSGSIZE; 334 } 335 336 static int smc_nl_fill_lgr(struct smc_link_group *lgr, 337 struct sk_buff *skb, 338 struct netlink_callback *cb) 339 { 340 char smc_target[SMC_MAX_PNETID_LEN + 1]; 341 struct nlattr *attrs, *v2_attrs; 342 343 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR); 344 if (!attrs) 345 goto errout; 346 347 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id))) 348 goto errattr; 349 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num)) 350 goto errattr; 351 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role)) 352 goto errattr; 353 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type)) 354 goto errattr; 355 if (nla_put_u8(skb, SMC_NLA_LGR_R_BUF_TYPE, lgr->buf_type)) 356 goto errattr; 357 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id)) 358 goto errattr; 359 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE, 360 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD)) 361 goto errattr; 362 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN); 363 smc_target[SMC_MAX_PNETID_LEN] = 0; 364 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target)) 365 goto errattr; 366 if (lgr->smc_version > SMC_V1) { 367 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON); 368 if (!v2_attrs) 369 goto errattr; 370 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 371 goto errattr; 372 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb)) 373 goto errattr; 374 } 375 376 nla_nest_end(skb, attrs); 377 return 0; 378 errattr: 379 nla_nest_cancel(skb, attrs); 380 errout: 381 return -EMSGSIZE; 382 } 383 384 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr, 385 struct smc_link *link, 386 struct sk_buff *skb, 387 struct netlink_callback *cb) 388 { 389 char smc_ibname[IB_DEVICE_NAME_MAX]; 390 u8 smc_gid_target[41]; 391 struct nlattr *attrs; 392 u32 link_uid = 0; 393 void *nlh; 394 395 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 396 &smc_gen_nl_family, NLM_F_MULTI, 397 SMC_NETLINK_GET_LINK_SMCR); 398 if (!nlh) 399 goto errmsg; 400 401 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR); 402 if (!attrs) 403 goto errout; 404 405 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id)) 406 goto errattr; 407 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state)) 408 goto errattr; 409 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT, 410 atomic_read(&link->conn_cnt))) 411 goto errattr; 412 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport)) 413 goto errattr; 414 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx)) 415 goto errattr; 416 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname); 417 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname)) 418 goto errattr; 419 memcpy(&link_uid, link->link_uid, sizeof(link_uid)); 420 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid)) 421 goto errattr; 422 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid)); 423 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid)) 424 goto errattr; 425 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 426 smc_gid_be16_convert(smc_gid_target, link->gid); 427 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target)) 428 goto errattr; 429 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 430 smc_gid_be16_convert(smc_gid_target, link->peer_gid); 431 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target)) 432 goto errattr; 433 434 nla_nest_end(skb, attrs); 435 genlmsg_end(skb, nlh); 436 return 0; 437 errattr: 438 nla_nest_cancel(skb, attrs); 439 errout: 440 genlmsg_cancel(skb, nlh); 441 errmsg: 442 return -EMSGSIZE; 443 } 444 445 static int smc_nl_handle_lgr(struct smc_link_group *lgr, 446 struct sk_buff *skb, 447 struct netlink_callback *cb, 448 bool list_links) 449 { 450 void *nlh; 451 int i; 452 453 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 454 &smc_gen_nl_family, NLM_F_MULTI, 455 SMC_NETLINK_GET_LGR_SMCR); 456 if (!nlh) 457 goto errmsg; 458 if (smc_nl_fill_lgr(lgr, skb, cb)) 459 goto errout; 460 461 genlmsg_end(skb, nlh); 462 if (!list_links) 463 goto out; 464 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 465 if (!smc_link_usable(&lgr->lnk[i])) 466 continue; 467 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb)) 468 goto errout; 469 } 470 out: 471 return 0; 472 473 errout: 474 genlmsg_cancel(skb, nlh); 475 errmsg: 476 return -EMSGSIZE; 477 } 478 479 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr, 480 struct sk_buff *skb, 481 struct netlink_callback *cb, 482 bool list_links) 483 { 484 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 485 struct smc_link_group *lgr; 486 int snum = cb_ctx->pos[0]; 487 int num = 0; 488 489 spin_lock_bh(&smc_lgr->lock); 490 list_for_each_entry(lgr, &smc_lgr->list, list) { 491 if (num < snum) 492 goto next; 493 if (smc_nl_handle_lgr(lgr, skb, cb, list_links)) 494 goto errout; 495 next: 496 num++; 497 } 498 errout: 499 spin_unlock_bh(&smc_lgr->lock); 500 cb_ctx->pos[0] = num; 501 } 502 503 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr, 504 struct sk_buff *skb, 505 struct netlink_callback *cb) 506 { 507 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 508 struct smcd_dev *smcd = lgr->smcd; 509 struct nlattr *attrs; 510 void *nlh; 511 512 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 513 &smc_gen_nl_family, NLM_F_MULTI, 514 SMC_NETLINK_GET_LGR_SMCD); 515 if (!nlh) 516 goto errmsg; 517 518 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD); 519 if (!attrs) 520 goto errout; 521 522 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id))) 523 goto errattr; 524 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, 525 smcd->ops->get_local_gid(smcd), 526 SMC_NLA_LGR_D_PAD)) 527 goto errattr; 528 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid, 529 SMC_NLA_LGR_D_PAD)) 530 goto errattr; 531 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id)) 532 goto errattr; 533 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num)) 534 goto errattr; 535 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd))) 536 goto errattr; 537 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN); 538 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 539 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet)) 540 goto errattr; 541 if (lgr->smc_version > SMC_V1) { 542 struct nlattr *v2_attrs; 543 544 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON); 545 if (!v2_attrs) 546 goto errattr; 547 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 548 goto errattr; 549 } 550 nla_nest_end(skb, attrs); 551 genlmsg_end(skb, nlh); 552 return 0; 553 554 errattr: 555 nla_nest_cancel(skb, attrs); 556 errout: 557 genlmsg_cancel(skb, nlh); 558 errmsg: 559 return -EMSGSIZE; 560 } 561 562 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev, 563 struct sk_buff *skb, 564 struct netlink_callback *cb) 565 { 566 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 567 struct smc_link_group *lgr; 568 int snum = cb_ctx->pos[1]; 569 int rc = 0, num = 0; 570 571 spin_lock_bh(&dev->lgr_lock); 572 list_for_each_entry(lgr, &dev->lgr_list, list) { 573 if (!lgr->is_smcd) 574 continue; 575 if (num < snum) 576 goto next; 577 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb); 578 if (rc) 579 goto errout; 580 next: 581 num++; 582 } 583 errout: 584 spin_unlock_bh(&dev->lgr_lock); 585 cb_ctx->pos[1] = num; 586 return rc; 587 } 588 589 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list, 590 struct sk_buff *skb, 591 struct netlink_callback *cb) 592 { 593 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 594 struct smcd_dev *smcd_dev; 595 int snum = cb_ctx->pos[0]; 596 int rc = 0, num = 0; 597 598 mutex_lock(&dev_list->mutex); 599 list_for_each_entry(smcd_dev, &dev_list->list, list) { 600 if (list_empty(&smcd_dev->lgr_list)) 601 continue; 602 if (num < snum) 603 goto next; 604 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb); 605 if (rc) 606 goto errout; 607 next: 608 num++; 609 } 610 errout: 611 mutex_unlock(&dev_list->mutex); 612 cb_ctx->pos[0] = num; 613 return rc; 614 } 615 616 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 617 { 618 bool list_links = false; 619 620 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 621 return skb->len; 622 } 623 624 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb) 625 { 626 bool list_links = true; 627 628 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 629 return skb->len; 630 } 631 632 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 633 { 634 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb); 635 return skb->len; 636 } 637 638 void smc_lgr_cleanup_early(struct smc_link_group *lgr) 639 { 640 spinlock_t *lgr_lock; 641 642 if (!lgr) 643 return; 644 645 smc_lgr_list_head(lgr, &lgr_lock); 646 spin_lock_bh(lgr_lock); 647 /* do not use this link group for new connections */ 648 if (!list_empty(&lgr->list)) 649 list_del_init(&lgr->list); 650 spin_unlock_bh(lgr_lock); 651 __smc_lgr_terminate(lgr, true); 652 } 653 654 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 655 { 656 int i; 657 658 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 659 struct smc_link *lnk = &lgr->lnk[i]; 660 661 if (smc_link_sendable(lnk)) 662 lnk->state = SMC_LNK_INACTIVE; 663 } 664 wake_up_all(&lgr->llc_msg_waiter); 665 wake_up_all(&lgr->llc_flow_waiter); 666 } 667 668 static void smc_lgr_free(struct smc_link_group *lgr); 669 670 static void smc_lgr_free_work(struct work_struct *work) 671 { 672 struct smc_link_group *lgr = container_of(to_delayed_work(work), 673 struct smc_link_group, 674 free_work); 675 spinlock_t *lgr_lock; 676 bool conns; 677 678 smc_lgr_list_head(lgr, &lgr_lock); 679 spin_lock_bh(lgr_lock); 680 if (lgr->freeing) { 681 spin_unlock_bh(lgr_lock); 682 return; 683 } 684 read_lock_bh(&lgr->conns_lock); 685 conns = RB_EMPTY_ROOT(&lgr->conns_all); 686 read_unlock_bh(&lgr->conns_lock); 687 if (!conns) { /* number of lgr connections is no longer zero */ 688 spin_unlock_bh(lgr_lock); 689 return; 690 } 691 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 692 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 693 spin_unlock_bh(lgr_lock); 694 cancel_delayed_work(&lgr->free_work); 695 696 if (!lgr->is_smcd && !lgr->terminating) 697 smc_llc_send_link_delete_all(lgr, true, 698 SMC_LLC_DEL_PROG_INIT_TERM); 699 if (lgr->is_smcd && !lgr->terminating) 700 smc_ism_signal_shutdown(lgr); 701 if (!lgr->is_smcd) 702 smcr_lgr_link_deactivate_all(lgr); 703 smc_lgr_free(lgr); 704 } 705 706 static void smc_lgr_terminate_work(struct work_struct *work) 707 { 708 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 709 terminate_work); 710 711 __smc_lgr_terminate(lgr, true); 712 } 713 714 /* return next unique link id for the lgr */ 715 static u8 smcr_next_link_id(struct smc_link_group *lgr) 716 { 717 u8 link_id; 718 int i; 719 720 while (1) { 721 again: 722 link_id = ++lgr->next_link_id; 723 if (!link_id) /* skip zero as link_id */ 724 link_id = ++lgr->next_link_id; 725 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 726 if (smc_link_usable(&lgr->lnk[i]) && 727 lgr->lnk[i].link_id == link_id) 728 goto again; 729 } 730 break; 731 } 732 return link_id; 733 } 734 735 static void smcr_copy_dev_info_to_link(struct smc_link *link) 736 { 737 struct smc_ib_device *smcibdev = link->smcibdev; 738 739 snprintf(link->ibname, sizeof(link->ibname), "%s", 740 smcibdev->ibdev->name); 741 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; 742 } 743 744 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 745 u8 link_idx, struct smc_init_info *ini) 746 { 747 struct smc_ib_device *smcibdev; 748 u8 rndvec[3]; 749 int rc; 750 751 if (lgr->smc_version == SMC_V2) { 752 lnk->smcibdev = ini->smcrv2.ib_dev_v2; 753 lnk->ibport = ini->smcrv2.ib_port_v2; 754 } else { 755 lnk->smcibdev = ini->ib_dev; 756 lnk->ibport = ini->ib_port; 757 } 758 get_device(&lnk->smcibdev->ibdev->dev); 759 atomic_inc(&lnk->smcibdev->lnk_cnt); 760 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 761 lnk->clearing = 0; 762 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 763 lnk->link_id = smcr_next_link_id(lgr); 764 lnk->lgr = lgr; 765 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 766 lnk->link_idx = link_idx; 767 lnk->wr_rx_id_compl = 0; 768 smc_ibdev_cnt_inc(lnk); 769 smcr_copy_dev_info_to_link(lnk); 770 atomic_set(&lnk->conn_cnt, 0); 771 smc_llc_link_set_uid(lnk); 772 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 773 if (!lnk->smcibdev->initialized) { 774 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 775 if (rc) 776 goto out; 777 } 778 get_random_bytes(rndvec, sizeof(rndvec)); 779 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 780 (rndvec[2] << 16); 781 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 782 ini->vlan_id, lnk->gid, &lnk->sgid_index, 783 lgr->smc_version == SMC_V2 ? 784 &ini->smcrv2 : NULL); 785 if (rc) 786 goto out; 787 rc = smc_llc_link_init(lnk); 788 if (rc) 789 goto out; 790 rc = smc_wr_alloc_link_mem(lnk); 791 if (rc) 792 goto clear_llc_lnk; 793 rc = smc_ib_create_protection_domain(lnk); 794 if (rc) 795 goto free_link_mem; 796 rc = smc_ib_create_queue_pair(lnk); 797 if (rc) 798 goto dealloc_pd; 799 rc = smc_wr_create_link(lnk); 800 if (rc) 801 goto destroy_qp; 802 lnk->state = SMC_LNK_ACTIVATING; 803 return 0; 804 805 destroy_qp: 806 smc_ib_destroy_queue_pair(lnk); 807 dealloc_pd: 808 smc_ib_dealloc_protection_domain(lnk); 809 free_link_mem: 810 smc_wr_free_link_mem(lnk); 811 clear_llc_lnk: 812 smc_llc_link_clear(lnk, false); 813 out: 814 smc_ibdev_cnt_dec(lnk); 815 put_device(&lnk->smcibdev->ibdev->dev); 816 smcibdev = lnk->smcibdev; 817 memset(lnk, 0, sizeof(struct smc_link)); 818 lnk->state = SMC_LNK_UNUSED; 819 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 820 wake_up(&smcibdev->lnks_deleted); 821 smc_lgr_put(lgr); /* lgr_hold above */ 822 return rc; 823 } 824 825 /* create a new SMC link group */ 826 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 827 { 828 struct smc_link_group *lgr; 829 struct list_head *lgr_list; 830 struct smcd_dev *smcd; 831 struct smc_link *lnk; 832 spinlock_t *lgr_lock; 833 u8 link_idx; 834 int rc = 0; 835 int i; 836 837 if (ini->is_smcd && ini->vlan_id) { 838 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 839 ini->vlan_id)) { 840 rc = SMC_CLC_DECL_ISMVLANERR; 841 goto out; 842 } 843 } 844 845 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 846 if (!lgr) { 847 rc = SMC_CLC_DECL_MEM; 848 goto ism_put_vlan; 849 } 850 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 851 SMC_LGR_ID_SIZE, &lgr->id); 852 if (!lgr->tx_wq) { 853 rc = -ENOMEM; 854 goto free_lgr; 855 } 856 lgr->is_smcd = ini->is_smcd; 857 lgr->sync_err = 0; 858 lgr->terminating = 0; 859 lgr->freeing = 0; 860 lgr->vlan_id = ini->vlan_id; 861 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 862 init_rwsem(&lgr->sndbufs_lock); 863 init_rwsem(&lgr->rmbs_lock); 864 rwlock_init(&lgr->conns_lock); 865 for (i = 0; i < SMC_RMBE_SIZES; i++) { 866 INIT_LIST_HEAD(&lgr->sndbufs[i]); 867 INIT_LIST_HEAD(&lgr->rmbs[i]); 868 } 869 lgr->next_link_id = 0; 870 smc_lgr_list.num += SMC_LGR_NUM_INCR; 871 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 872 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 873 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 874 lgr->conns_all = RB_ROOT; 875 if (ini->is_smcd) { 876 /* SMC-D specific settings */ 877 smcd = ini->ism_dev[ini->ism_selected]; 878 get_device(smcd->ops->get_dev(smcd)); 879 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected]; 880 lgr->smcd = ini->ism_dev[ini->ism_selected]; 881 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 882 lgr_lock = &lgr->smcd->lgr_lock; 883 lgr->smc_version = ini->smcd_version; 884 lgr->peer_shutdown = 0; 885 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 886 } else { 887 /* SMC-R specific settings */ 888 struct smc_ib_device *ibdev; 889 int ibport; 890 891 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 892 lgr->smc_version = ini->smcr_version; 893 memcpy(lgr->peer_systemid, ini->peer_systemid, 894 SMC_SYSTEMID_LEN); 895 if (lgr->smc_version == SMC_V2) { 896 ibdev = ini->smcrv2.ib_dev_v2; 897 ibport = ini->smcrv2.ib_port_v2; 898 lgr->saddr = ini->smcrv2.saddr; 899 lgr->uses_gateway = ini->smcrv2.uses_gateway; 900 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 901 ETH_ALEN); 902 lgr->max_conns = ini->max_conns; 903 lgr->max_links = ini->max_links; 904 } else { 905 ibdev = ini->ib_dev; 906 ibport = ini->ib_port; 907 lgr->max_conns = SMC_CONN_PER_LGR_MAX; 908 lgr->max_links = SMC_LINKS_ADD_LNK_MAX; 909 } 910 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 911 SMC_MAX_PNETID_LEN); 912 rc = smc_wr_alloc_lgr_mem(lgr); 913 if (rc) 914 goto free_wq; 915 smc_llc_lgr_init(lgr, smc); 916 917 link_idx = SMC_SINGLE_LINK; 918 lnk = &lgr->lnk[link_idx]; 919 rc = smcr_link_init(lgr, lnk, link_idx, ini); 920 if (rc) { 921 smc_wr_free_lgr_mem(lgr); 922 goto free_wq; 923 } 924 lgr->net = smc_ib_net(lnk->smcibdev); 925 lgr_list = &smc_lgr_list.list; 926 lgr_lock = &smc_lgr_list.lock; 927 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 928 atomic_inc(&lgr_cnt); 929 } 930 smc->conn.lgr = lgr; 931 spin_lock_bh(lgr_lock); 932 list_add_tail(&lgr->list, lgr_list); 933 spin_unlock_bh(lgr_lock); 934 return 0; 935 936 free_wq: 937 destroy_workqueue(lgr->tx_wq); 938 free_lgr: 939 kfree(lgr); 940 ism_put_vlan: 941 if (ini->is_smcd && ini->vlan_id) 942 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 943 out: 944 if (rc < 0) { 945 if (rc == -ENOMEM) 946 rc = SMC_CLC_DECL_MEM; 947 else 948 rc = SMC_CLC_DECL_INTERR; 949 } 950 return rc; 951 } 952 953 static int smc_write_space(struct smc_connection *conn) 954 { 955 int buffer_len = conn->peer_rmbe_size; 956 union smc_host_cursor prod; 957 union smc_host_cursor cons; 958 int space; 959 960 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 961 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 962 /* determine rx_buf space */ 963 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 964 return space; 965 } 966 967 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 968 struct smc_wr_buf *wr_buf) 969 { 970 struct smc_connection *conn = &smc->conn; 971 union smc_host_cursor cons, fin; 972 int rc = 0; 973 int diff; 974 975 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 976 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 977 /* set prod cursor to old state, enforce tx_rdma_writes() */ 978 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 979 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 980 981 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 982 /* cons cursor advanced more than fin, and prod was set 983 * fin above, so now prod is smaller than cons. Fix that. 984 */ 985 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 986 smc_curs_add(conn->sndbuf_desc->len, 987 &conn->tx_curs_sent, diff); 988 smc_curs_add(conn->sndbuf_desc->len, 989 &conn->tx_curs_fin, diff); 990 991 smp_mb__before_atomic(); 992 atomic_add(diff, &conn->sndbuf_space); 993 smp_mb__after_atomic(); 994 995 smc_curs_add(conn->peer_rmbe_size, 996 &conn->local_tx_ctrl.prod, diff); 997 smc_curs_add(conn->peer_rmbe_size, 998 &conn->local_tx_ctrl_fin, diff); 999 } 1000 /* recalculate, value is used by tx_rdma_writes() */ 1001 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 1002 1003 if (smc->sk.sk_state != SMC_INIT && 1004 smc->sk.sk_state != SMC_CLOSED) { 1005 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 1006 if (!rc) { 1007 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 1008 smc->sk.sk_data_ready(&smc->sk); 1009 } 1010 } else { 1011 smc_wr_tx_put_slot(conn->lnk, 1012 (struct smc_wr_tx_pend_priv *)pend); 1013 } 1014 return rc; 1015 } 1016 1017 void smc_switch_link_and_count(struct smc_connection *conn, 1018 struct smc_link *to_lnk) 1019 { 1020 atomic_dec(&conn->lnk->conn_cnt); 1021 /* link_hold in smc_conn_create() */ 1022 smcr_link_put(conn->lnk); 1023 conn->lnk = to_lnk; 1024 atomic_inc(&conn->lnk->conn_cnt); 1025 /* link_put in smc_conn_free() */ 1026 smcr_link_hold(conn->lnk); 1027 } 1028 1029 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1030 struct smc_link *from_lnk, bool is_dev_err) 1031 { 1032 struct smc_link *to_lnk = NULL; 1033 struct smc_cdc_tx_pend *pend; 1034 struct smc_connection *conn; 1035 struct smc_wr_buf *wr_buf; 1036 struct smc_sock *smc; 1037 struct rb_node *node; 1038 int i, rc = 0; 1039 1040 /* link is inactive, wake up tx waiters */ 1041 smc_wr_wakeup_tx_wait(from_lnk); 1042 1043 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1044 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1045 continue; 1046 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1047 from_lnk->ibport == lgr->lnk[i].ibport) { 1048 continue; 1049 } 1050 to_lnk = &lgr->lnk[i]; 1051 break; 1052 } 1053 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1054 smc_lgr_terminate_sched(lgr); 1055 return NULL; 1056 } 1057 again: 1058 read_lock_bh(&lgr->conns_lock); 1059 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1060 conn = rb_entry(node, struct smc_connection, alert_node); 1061 if (conn->lnk != from_lnk) 1062 continue; 1063 smc = container_of(conn, struct smc_sock, conn); 1064 /* conn->lnk not yet set in SMC_INIT state */ 1065 if (smc->sk.sk_state == SMC_INIT) 1066 continue; 1067 if (smc->sk.sk_state == SMC_CLOSED || 1068 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1069 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1070 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1071 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1072 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1073 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1074 smc->sk.sk_state == SMC_PEERABORTWAIT || 1075 smc->sk.sk_state == SMC_PROCESSABORT) { 1076 spin_lock_bh(&conn->send_lock); 1077 smc_switch_link_and_count(conn, to_lnk); 1078 spin_unlock_bh(&conn->send_lock); 1079 continue; 1080 } 1081 sock_hold(&smc->sk); 1082 read_unlock_bh(&lgr->conns_lock); 1083 /* pre-fetch buffer outside of send_lock, might sleep */ 1084 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1085 if (rc) 1086 goto err_out; 1087 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1088 spin_lock_bh(&conn->send_lock); 1089 smc_switch_link_and_count(conn, to_lnk); 1090 rc = smc_switch_cursor(smc, pend, wr_buf); 1091 spin_unlock_bh(&conn->send_lock); 1092 sock_put(&smc->sk); 1093 if (rc) 1094 goto err_out; 1095 goto again; 1096 } 1097 read_unlock_bh(&lgr->conns_lock); 1098 smc_wr_tx_link_put(to_lnk); 1099 return to_lnk; 1100 1101 err_out: 1102 smcr_link_down_cond_sched(to_lnk); 1103 smc_wr_tx_link_put(to_lnk); 1104 return NULL; 1105 } 1106 1107 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1108 struct smc_link_group *lgr) 1109 { 1110 struct rw_semaphore *lock; /* lock buffer list */ 1111 int rc; 1112 1113 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1114 /* unregister rmb with peer */ 1115 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1116 if (!rc) { 1117 /* protect against smc_llc_cli_rkey_exchange() */ 1118 down_read(&lgr->llc_conf_mutex); 1119 smc_llc_do_delete_rkey(lgr, buf_desc); 1120 buf_desc->is_conf_rkey = false; 1121 up_read(&lgr->llc_conf_mutex); 1122 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1123 } 1124 } 1125 1126 if (buf_desc->is_reg_err) { 1127 /* buf registration failed, reuse not possible */ 1128 lock = is_rmb ? &lgr->rmbs_lock : 1129 &lgr->sndbufs_lock; 1130 down_write(lock); 1131 list_del(&buf_desc->list); 1132 up_write(lock); 1133 1134 smc_buf_free(lgr, is_rmb, buf_desc); 1135 } else { 1136 /* memzero_explicit provides potential memory barrier semantics */ 1137 memzero_explicit(buf_desc->cpu_addr, buf_desc->len); 1138 WRITE_ONCE(buf_desc->used, 0); 1139 } 1140 } 1141 1142 static void smc_buf_unuse(struct smc_connection *conn, 1143 struct smc_link_group *lgr) 1144 { 1145 if (conn->sndbuf_desc) { 1146 if (!lgr->is_smcd && conn->sndbuf_desc->is_vm) { 1147 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1148 } else { 1149 memzero_explicit(conn->sndbuf_desc->cpu_addr, conn->sndbuf_desc->len); 1150 WRITE_ONCE(conn->sndbuf_desc->used, 0); 1151 } 1152 } 1153 if (conn->rmb_desc) { 1154 if (!lgr->is_smcd) { 1155 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1156 } else { 1157 memzero_explicit(conn->rmb_desc->cpu_addr, 1158 conn->rmb_desc->len + sizeof(struct smcd_cdc_msg)); 1159 WRITE_ONCE(conn->rmb_desc->used, 0); 1160 } 1161 } 1162 } 1163 1164 /* remove a finished connection from its link group */ 1165 void smc_conn_free(struct smc_connection *conn) 1166 { 1167 struct smc_link_group *lgr = conn->lgr; 1168 1169 if (!lgr || conn->freed) 1170 /* Connection has never been registered in a 1171 * link group, or has already been freed. 1172 */ 1173 return; 1174 1175 conn->freed = 1; 1176 if (!smc_conn_lgr_valid(conn)) 1177 /* Connection has already unregistered from 1178 * link group. 1179 */ 1180 goto lgr_put; 1181 1182 if (lgr->is_smcd) { 1183 if (!list_empty(&lgr->list)) 1184 smc_ism_unset_conn(conn); 1185 tasklet_kill(&conn->rx_tsklet); 1186 } else { 1187 smc_cdc_wait_pend_tx_wr(conn); 1188 if (current_work() != &conn->abort_work) 1189 cancel_work_sync(&conn->abort_work); 1190 } 1191 if (!list_empty(&lgr->list)) { 1192 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1193 smc_lgr_unregister_conn(conn); 1194 } 1195 1196 if (!lgr->conns_num) 1197 smc_lgr_schedule_free_work(lgr); 1198 lgr_put: 1199 if (!lgr->is_smcd) 1200 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1201 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1202 } 1203 1204 /* unregister a link from a buf_desc */ 1205 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1206 struct smc_link *lnk) 1207 { 1208 if (is_rmb || buf_desc->is_vm) 1209 buf_desc->is_reg_mr[lnk->link_idx] = false; 1210 if (!buf_desc->is_map_ib[lnk->link_idx]) 1211 return; 1212 1213 if ((is_rmb || buf_desc->is_vm) && 1214 buf_desc->mr[lnk->link_idx]) { 1215 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1216 buf_desc->mr[lnk->link_idx] = NULL; 1217 } 1218 if (is_rmb) 1219 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1220 else 1221 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1222 1223 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1224 buf_desc->is_map_ib[lnk->link_idx] = false; 1225 } 1226 1227 /* unmap all buffers of lgr for a deleted link */ 1228 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1229 { 1230 struct smc_link_group *lgr = lnk->lgr; 1231 struct smc_buf_desc *buf_desc, *bf; 1232 int i; 1233 1234 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1235 down_write(&lgr->rmbs_lock); 1236 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1237 smcr_buf_unmap_link(buf_desc, true, lnk); 1238 up_write(&lgr->rmbs_lock); 1239 1240 down_write(&lgr->sndbufs_lock); 1241 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1242 list) 1243 smcr_buf_unmap_link(buf_desc, false, lnk); 1244 up_write(&lgr->sndbufs_lock); 1245 } 1246 } 1247 1248 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1249 { 1250 struct smc_link_group *lgr = lnk->lgr; 1251 int i; 1252 1253 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1254 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1255 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1256 } 1257 } 1258 1259 static void __smcr_link_clear(struct smc_link *lnk) 1260 { 1261 struct smc_link_group *lgr = lnk->lgr; 1262 struct smc_ib_device *smcibdev; 1263 1264 smc_wr_free_link_mem(lnk); 1265 smc_ibdev_cnt_dec(lnk); 1266 put_device(&lnk->smcibdev->ibdev->dev); 1267 smcibdev = lnk->smcibdev; 1268 memset(lnk, 0, sizeof(struct smc_link)); 1269 lnk->state = SMC_LNK_UNUSED; 1270 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1271 wake_up(&smcibdev->lnks_deleted); 1272 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1273 } 1274 1275 /* must be called under lgr->llc_conf_mutex lock */ 1276 void smcr_link_clear(struct smc_link *lnk, bool log) 1277 { 1278 if (!lnk->lgr || lnk->clearing || 1279 lnk->state == SMC_LNK_UNUSED) 1280 return; 1281 lnk->clearing = 1; 1282 lnk->peer_qpn = 0; 1283 smc_llc_link_clear(lnk, log); 1284 smcr_buf_unmap_lgr(lnk); 1285 smcr_rtoken_clear_link(lnk); 1286 smc_ib_modify_qp_error(lnk); 1287 smc_wr_free_link(lnk); 1288 smc_ib_destroy_queue_pair(lnk); 1289 smc_ib_dealloc_protection_domain(lnk); 1290 smcr_link_put(lnk); /* theoretically last link_put */ 1291 } 1292 1293 void smcr_link_hold(struct smc_link *lnk) 1294 { 1295 refcount_inc(&lnk->refcnt); 1296 } 1297 1298 void smcr_link_put(struct smc_link *lnk) 1299 { 1300 if (refcount_dec_and_test(&lnk->refcnt)) 1301 __smcr_link_clear(lnk); 1302 } 1303 1304 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1305 struct smc_buf_desc *buf_desc) 1306 { 1307 int i; 1308 1309 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1310 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1311 1312 if (!buf_desc->is_vm && buf_desc->pages) 1313 __free_pages(buf_desc->pages, buf_desc->order); 1314 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1315 vfree(buf_desc->cpu_addr); 1316 kfree(buf_desc); 1317 } 1318 1319 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1320 struct smc_buf_desc *buf_desc) 1321 { 1322 if (is_dmb) { 1323 /* restore original buf len */ 1324 buf_desc->len += sizeof(struct smcd_cdc_msg); 1325 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1326 } else { 1327 kfree(buf_desc->cpu_addr); 1328 } 1329 kfree(buf_desc); 1330 } 1331 1332 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1333 struct smc_buf_desc *buf_desc) 1334 { 1335 if (lgr->is_smcd) 1336 smcd_buf_free(lgr, is_rmb, buf_desc); 1337 else 1338 smcr_buf_free(lgr, is_rmb, buf_desc); 1339 } 1340 1341 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1342 { 1343 struct smc_buf_desc *buf_desc, *bf_desc; 1344 struct list_head *buf_list; 1345 int i; 1346 1347 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1348 if (is_rmb) 1349 buf_list = &lgr->rmbs[i]; 1350 else 1351 buf_list = &lgr->sndbufs[i]; 1352 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1353 list) { 1354 list_del(&buf_desc->list); 1355 smc_buf_free(lgr, is_rmb, buf_desc); 1356 } 1357 } 1358 } 1359 1360 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1361 { 1362 /* free send buffers */ 1363 __smc_lgr_free_bufs(lgr, false); 1364 /* free rmbs */ 1365 __smc_lgr_free_bufs(lgr, true); 1366 } 1367 1368 /* won't be freed until no one accesses to lgr anymore */ 1369 static void __smc_lgr_free(struct smc_link_group *lgr) 1370 { 1371 smc_lgr_free_bufs(lgr); 1372 if (lgr->is_smcd) { 1373 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1374 wake_up(&lgr->smcd->lgrs_deleted); 1375 } else { 1376 smc_wr_free_lgr_mem(lgr); 1377 if (!atomic_dec_return(&lgr_cnt)) 1378 wake_up(&lgrs_deleted); 1379 } 1380 kfree(lgr); 1381 } 1382 1383 /* remove a link group */ 1384 static void smc_lgr_free(struct smc_link_group *lgr) 1385 { 1386 int i; 1387 1388 if (!lgr->is_smcd) { 1389 down_write(&lgr->llc_conf_mutex); 1390 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1391 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1392 smcr_link_clear(&lgr->lnk[i], false); 1393 } 1394 up_write(&lgr->llc_conf_mutex); 1395 smc_llc_lgr_clear(lgr); 1396 } 1397 1398 destroy_workqueue(lgr->tx_wq); 1399 if (lgr->is_smcd) { 1400 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1401 put_device(lgr->smcd->ops->get_dev(lgr->smcd)); 1402 } 1403 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1404 } 1405 1406 void smc_lgr_hold(struct smc_link_group *lgr) 1407 { 1408 refcount_inc(&lgr->refcnt); 1409 } 1410 1411 void smc_lgr_put(struct smc_link_group *lgr) 1412 { 1413 if (refcount_dec_and_test(&lgr->refcnt)) 1414 __smc_lgr_free(lgr); 1415 } 1416 1417 static void smc_sk_wake_ups(struct smc_sock *smc) 1418 { 1419 smc->sk.sk_write_space(&smc->sk); 1420 smc->sk.sk_data_ready(&smc->sk); 1421 smc->sk.sk_state_change(&smc->sk); 1422 } 1423 1424 /* kill a connection */ 1425 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1426 { 1427 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1428 1429 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1430 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1431 else 1432 smc_close_abort(conn); 1433 conn->killed = 1; 1434 smc->sk.sk_err = ECONNABORTED; 1435 smc_sk_wake_ups(smc); 1436 if (conn->lgr->is_smcd) { 1437 smc_ism_unset_conn(conn); 1438 if (soft) 1439 tasklet_kill(&conn->rx_tsklet); 1440 else 1441 tasklet_unlock_wait(&conn->rx_tsklet); 1442 } else { 1443 smc_cdc_wait_pend_tx_wr(conn); 1444 } 1445 smc_lgr_unregister_conn(conn); 1446 smc_close_active_abort(smc); 1447 } 1448 1449 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1450 { 1451 if (lgr->is_smcd) { 1452 smc_ism_signal_shutdown(lgr); 1453 } else { 1454 u32 rsn = lgr->llc_termination_rsn; 1455 1456 if (!rsn) 1457 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1458 smc_llc_send_link_delete_all(lgr, false, rsn); 1459 smcr_lgr_link_deactivate_all(lgr); 1460 } 1461 } 1462 1463 /* terminate link group 1464 * @soft: true if link group shutdown can take its time 1465 * false if immediate link group shutdown is required 1466 */ 1467 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1468 { 1469 struct smc_connection *conn; 1470 struct smc_sock *smc; 1471 struct rb_node *node; 1472 1473 if (lgr->terminating) 1474 return; /* lgr already terminating */ 1475 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1476 cancel_delayed_work(&lgr->free_work); 1477 lgr->terminating = 1; 1478 1479 /* kill remaining link group connections */ 1480 read_lock_bh(&lgr->conns_lock); 1481 node = rb_first(&lgr->conns_all); 1482 while (node) { 1483 read_unlock_bh(&lgr->conns_lock); 1484 conn = rb_entry(node, struct smc_connection, alert_node); 1485 smc = container_of(conn, struct smc_sock, conn); 1486 sock_hold(&smc->sk); /* sock_put below */ 1487 lock_sock(&smc->sk); 1488 smc_conn_kill(conn, soft); 1489 release_sock(&smc->sk); 1490 sock_put(&smc->sk); /* sock_hold above */ 1491 read_lock_bh(&lgr->conns_lock); 1492 node = rb_first(&lgr->conns_all); 1493 } 1494 read_unlock_bh(&lgr->conns_lock); 1495 smc_lgr_cleanup(lgr); 1496 smc_lgr_free(lgr); 1497 } 1498 1499 /* unlink link group and schedule termination */ 1500 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1501 { 1502 spinlock_t *lgr_lock; 1503 1504 smc_lgr_list_head(lgr, &lgr_lock); 1505 spin_lock_bh(lgr_lock); 1506 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1507 spin_unlock_bh(lgr_lock); 1508 return; /* lgr already terminating */ 1509 } 1510 list_del_init(&lgr->list); 1511 lgr->freeing = 1; 1512 spin_unlock_bh(lgr_lock); 1513 schedule_work(&lgr->terminate_work); 1514 } 1515 1516 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1517 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan) 1518 { 1519 struct smc_link_group *lgr, *l; 1520 LIST_HEAD(lgr_free_list); 1521 1522 /* run common cleanup function and build free list */ 1523 spin_lock_bh(&dev->lgr_lock); 1524 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1525 if ((!peer_gid || lgr->peer_gid == peer_gid) && 1526 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1527 if (peer_gid) /* peer triggered termination */ 1528 lgr->peer_shutdown = 1; 1529 list_move(&lgr->list, &lgr_free_list); 1530 lgr->freeing = 1; 1531 } 1532 } 1533 spin_unlock_bh(&dev->lgr_lock); 1534 1535 /* cancel the regular free workers and actually free lgrs */ 1536 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1537 list_del_init(&lgr->list); 1538 schedule_work(&lgr->terminate_work); 1539 } 1540 } 1541 1542 /* Called when an SMCD device is removed or the smc module is unloaded */ 1543 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1544 { 1545 struct smc_link_group *lgr, *lg; 1546 LIST_HEAD(lgr_free_list); 1547 1548 spin_lock_bh(&smcd->lgr_lock); 1549 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1550 list_for_each_entry(lgr, &lgr_free_list, list) 1551 lgr->freeing = 1; 1552 spin_unlock_bh(&smcd->lgr_lock); 1553 1554 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1555 list_del_init(&lgr->list); 1556 __smc_lgr_terminate(lgr, false); 1557 } 1558 1559 if (atomic_read(&smcd->lgr_cnt)) 1560 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1561 } 1562 1563 /* Called when an SMCR device is removed or the smc module is unloaded. 1564 * If smcibdev is given, all SMCR link groups using this device are terminated. 1565 * If smcibdev is NULL, all SMCR link groups are terminated. 1566 */ 1567 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1568 { 1569 struct smc_link_group *lgr, *lg; 1570 LIST_HEAD(lgr_free_list); 1571 int i; 1572 1573 spin_lock_bh(&smc_lgr_list.lock); 1574 if (!smcibdev) { 1575 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1576 list_for_each_entry(lgr, &lgr_free_list, list) 1577 lgr->freeing = 1; 1578 } else { 1579 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1580 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1581 if (lgr->lnk[i].smcibdev == smcibdev) 1582 smcr_link_down_cond_sched(&lgr->lnk[i]); 1583 } 1584 } 1585 } 1586 spin_unlock_bh(&smc_lgr_list.lock); 1587 1588 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1589 list_del_init(&lgr->list); 1590 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1591 __smc_lgr_terminate(lgr, false); 1592 } 1593 1594 if (smcibdev) { 1595 if (atomic_read(&smcibdev->lnk_cnt)) 1596 wait_event(smcibdev->lnks_deleted, 1597 !atomic_read(&smcibdev->lnk_cnt)); 1598 } else { 1599 if (atomic_read(&lgr_cnt)) 1600 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1601 } 1602 } 1603 1604 /* set new lgr type and clear all asymmetric link tagging */ 1605 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1606 { 1607 char *lgr_type = ""; 1608 int i; 1609 1610 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1611 if (smc_link_usable(&lgr->lnk[i])) 1612 lgr->lnk[i].link_is_asym = false; 1613 if (lgr->type == new_type) 1614 return; 1615 lgr->type = new_type; 1616 1617 switch (lgr->type) { 1618 case SMC_LGR_NONE: 1619 lgr_type = "NONE"; 1620 break; 1621 case SMC_LGR_SINGLE: 1622 lgr_type = "SINGLE"; 1623 break; 1624 case SMC_LGR_SYMMETRIC: 1625 lgr_type = "SYMMETRIC"; 1626 break; 1627 case SMC_LGR_ASYMMETRIC_PEER: 1628 lgr_type = "ASYMMETRIC_PEER"; 1629 break; 1630 case SMC_LGR_ASYMMETRIC_LOCAL: 1631 lgr_type = "ASYMMETRIC_LOCAL"; 1632 break; 1633 } 1634 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1635 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1636 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1637 } 1638 1639 /* set new lgr type and tag a link as asymmetric */ 1640 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1641 enum smc_lgr_type new_type, int asym_lnk_idx) 1642 { 1643 smcr_lgr_set_type(lgr, new_type); 1644 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1645 } 1646 1647 /* abort connection, abort_work scheduled from tasklet context */ 1648 static void smc_conn_abort_work(struct work_struct *work) 1649 { 1650 struct smc_connection *conn = container_of(work, 1651 struct smc_connection, 1652 abort_work); 1653 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1654 1655 lock_sock(&smc->sk); 1656 smc_conn_kill(conn, true); 1657 release_sock(&smc->sk); 1658 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1659 } 1660 1661 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1662 { 1663 struct smc_link_group *lgr, *n; 1664 1665 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1666 struct smc_link *link; 1667 1668 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1669 SMC_MAX_PNETID_LEN) || 1670 lgr->type == SMC_LGR_SYMMETRIC || 1671 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1672 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1673 continue; 1674 1675 if (lgr->type == SMC_LGR_SINGLE && lgr->max_links <= 1) 1676 continue; 1677 1678 /* trigger local add link processing */ 1679 link = smc_llc_usable_link(lgr); 1680 if (link) 1681 smc_llc_add_link_local(link); 1682 } 1683 } 1684 1685 /* link is down - switch connections to alternate link, 1686 * must be called under lgr->llc_conf_mutex lock 1687 */ 1688 static void smcr_link_down(struct smc_link *lnk) 1689 { 1690 struct smc_link_group *lgr = lnk->lgr; 1691 struct smc_link *to_lnk; 1692 int del_link_id; 1693 1694 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1695 return; 1696 1697 to_lnk = smc_switch_conns(lgr, lnk, true); 1698 if (!to_lnk) { /* no backup link available */ 1699 smcr_link_clear(lnk, true); 1700 return; 1701 } 1702 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1703 del_link_id = lnk->link_id; 1704 1705 if (lgr->role == SMC_SERV) { 1706 /* trigger local delete link processing */ 1707 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1708 } else { 1709 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1710 /* another llc task is ongoing */ 1711 up_write(&lgr->llc_conf_mutex); 1712 wait_event_timeout(lgr->llc_flow_waiter, 1713 (list_empty(&lgr->list) || 1714 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1715 SMC_LLC_WAIT_TIME); 1716 down_write(&lgr->llc_conf_mutex); 1717 } 1718 if (!list_empty(&lgr->list)) { 1719 smc_llc_send_delete_link(to_lnk, del_link_id, 1720 SMC_LLC_REQ, true, 1721 SMC_LLC_DEL_LOST_PATH); 1722 smcr_link_clear(lnk, true); 1723 } 1724 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1725 } 1726 } 1727 1728 /* must be called under lgr->llc_conf_mutex lock */ 1729 void smcr_link_down_cond(struct smc_link *lnk) 1730 { 1731 if (smc_link_downing(&lnk->state)) { 1732 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1733 smcr_link_down(lnk); 1734 } 1735 } 1736 1737 /* will get the lgr->llc_conf_mutex lock */ 1738 void smcr_link_down_cond_sched(struct smc_link *lnk) 1739 { 1740 if (smc_link_downing(&lnk->state)) { 1741 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1742 schedule_work(&lnk->link_down_wrk); 1743 } 1744 } 1745 1746 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1747 { 1748 struct smc_link_group *lgr, *n; 1749 int i; 1750 1751 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1752 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1753 SMC_MAX_PNETID_LEN)) 1754 continue; /* lgr is not affected */ 1755 if (list_empty(&lgr->list)) 1756 continue; 1757 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1758 struct smc_link *lnk = &lgr->lnk[i]; 1759 1760 if (smc_link_usable(lnk) && 1761 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1762 smcr_link_down_cond_sched(lnk); 1763 } 1764 } 1765 } 1766 1767 static void smc_link_down_work(struct work_struct *work) 1768 { 1769 struct smc_link *link = container_of(work, struct smc_link, 1770 link_down_wrk); 1771 struct smc_link_group *lgr = link->lgr; 1772 1773 if (list_empty(&lgr->list)) 1774 return; 1775 wake_up_all(&lgr->llc_msg_waiter); 1776 down_write(&lgr->llc_conf_mutex); 1777 smcr_link_down(link); 1778 up_write(&lgr->llc_conf_mutex); 1779 } 1780 1781 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1782 struct netdev_nested_priv *priv) 1783 { 1784 unsigned short *vlan_id = (unsigned short *)priv->data; 1785 1786 if (is_vlan_dev(lower_dev)) { 1787 *vlan_id = vlan_dev_vlan_id(lower_dev); 1788 return 1; 1789 } 1790 1791 return 0; 1792 } 1793 1794 /* Determine vlan of internal TCP socket. */ 1795 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1796 { 1797 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1798 struct netdev_nested_priv priv; 1799 struct net_device *ndev; 1800 int rc = 0; 1801 1802 ini->vlan_id = 0; 1803 if (!dst) { 1804 rc = -ENOTCONN; 1805 goto out; 1806 } 1807 if (!dst->dev) { 1808 rc = -ENODEV; 1809 goto out_rel; 1810 } 1811 1812 ndev = dst->dev; 1813 if (is_vlan_dev(ndev)) { 1814 ini->vlan_id = vlan_dev_vlan_id(ndev); 1815 goto out_rel; 1816 } 1817 1818 priv.data = (void *)&ini->vlan_id; 1819 rtnl_lock(); 1820 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1821 rtnl_unlock(); 1822 1823 out_rel: 1824 dst_release(dst); 1825 out: 1826 return rc; 1827 } 1828 1829 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1830 u8 peer_systemid[], 1831 u8 peer_gid[], 1832 u8 peer_mac_v1[], 1833 enum smc_lgr_role role, u32 clcqpn, 1834 struct net *net) 1835 { 1836 struct smc_link *lnk; 1837 int i; 1838 1839 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1840 lgr->role != role) 1841 return false; 1842 1843 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1844 lnk = &lgr->lnk[i]; 1845 1846 if (!smc_link_active(lnk)) 1847 continue; 1848 /* use verbs API to check netns, instead of lgr->net */ 1849 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1850 return false; 1851 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1852 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1853 (smcr_version == SMC_V2 || 1854 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1855 return true; 1856 } 1857 return false; 1858 } 1859 1860 static bool smcd_lgr_match(struct smc_link_group *lgr, 1861 struct smcd_dev *smcismdev, u64 peer_gid) 1862 { 1863 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; 1864 } 1865 1866 /* create a new SMC connection (and a new link group if necessary) */ 1867 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1868 { 1869 struct smc_connection *conn = &smc->conn; 1870 struct net *net = sock_net(&smc->sk); 1871 struct list_head *lgr_list; 1872 struct smc_link_group *lgr; 1873 enum smc_lgr_role role; 1874 spinlock_t *lgr_lock; 1875 int rc = 0; 1876 1877 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1878 &smc_lgr_list.list; 1879 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1880 &smc_lgr_list.lock; 1881 ini->first_contact_local = 1; 1882 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1883 if (role == SMC_CLNT && ini->first_contact_peer) 1884 /* create new link group as well */ 1885 goto create; 1886 1887 /* determine if an existing link group can be reused */ 1888 spin_lock_bh(lgr_lock); 1889 list_for_each_entry(lgr, lgr_list, list) { 1890 write_lock_bh(&lgr->conns_lock); 1891 if ((ini->is_smcd ? 1892 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1893 ini->ism_peer_gid[ini->ism_selected]) : 1894 smcr_lgr_match(lgr, ini->smcr_version, 1895 ini->peer_systemid, 1896 ini->peer_gid, ini->peer_mac, role, 1897 ini->ib_clcqpn, net)) && 1898 !lgr->sync_err && 1899 (ini->smcd_version == SMC_V2 || 1900 lgr->vlan_id == ini->vlan_id) && 1901 (role == SMC_CLNT || ini->is_smcd || 1902 (lgr->conns_num < lgr->max_conns && 1903 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1904 /* link group found */ 1905 ini->first_contact_local = 0; 1906 conn->lgr = lgr; 1907 rc = smc_lgr_register_conn(conn, false); 1908 write_unlock_bh(&lgr->conns_lock); 1909 if (!rc && delayed_work_pending(&lgr->free_work)) 1910 cancel_delayed_work(&lgr->free_work); 1911 break; 1912 } 1913 write_unlock_bh(&lgr->conns_lock); 1914 } 1915 spin_unlock_bh(lgr_lock); 1916 if (rc) 1917 return rc; 1918 1919 if (role == SMC_CLNT && !ini->first_contact_peer && 1920 ini->first_contact_local) { 1921 /* Server reuses a link group, but Client wants to start 1922 * a new one 1923 * send out_of_sync decline, reason synchr. error 1924 */ 1925 return SMC_CLC_DECL_SYNCERR; 1926 } 1927 1928 create: 1929 if (ini->first_contact_local) { 1930 rc = smc_lgr_create(smc, ini); 1931 if (rc) 1932 goto out; 1933 lgr = conn->lgr; 1934 write_lock_bh(&lgr->conns_lock); 1935 rc = smc_lgr_register_conn(conn, true); 1936 write_unlock_bh(&lgr->conns_lock); 1937 if (rc) { 1938 smc_lgr_cleanup_early(lgr); 1939 goto out; 1940 } 1941 } 1942 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 1943 if (!conn->lgr->is_smcd) 1944 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 1945 conn->freed = 0; 1946 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 1947 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 1948 conn->urg_state = SMC_URG_READ; 1949 init_waitqueue_head(&conn->cdc_pend_tx_wq); 1950 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 1951 if (ini->is_smcd) { 1952 conn->rx_off = sizeof(struct smcd_cdc_msg); 1953 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 1954 } else { 1955 conn->rx_off = 0; 1956 } 1957 #ifndef KERNEL_HAS_ATOMIC64 1958 spin_lock_init(&conn->acurs_lock); 1959 #endif 1960 1961 out: 1962 return rc; 1963 } 1964 1965 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 1966 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */ 1967 1968 /* convert the RMB size into the compressed notation (minimum 16K, see 1969 * SMCD/R_DMBE_SIZES. 1970 * In contrast to plain ilog2, this rounds towards the next power of 2, 1971 * so the socket application gets at least its desired sndbuf / rcvbuf size. 1972 */ 1973 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 1974 { 1975 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE; 1976 u8 compressed; 1977 1978 if (size <= SMC_BUF_MIN_SIZE) 1979 return 0; 1980 1981 size = (size - 1) >> 14; /* convert to 16K multiple */ 1982 compressed = min_t(u8, ilog2(size) + 1, 1983 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 1984 1985 if (!is_smcd && is_rmb) 1986 /* RMBs are backed by & limited to max size of scatterlists */ 1987 compressed = min_t(u8, compressed, ilog2(max_scat >> 14)); 1988 1989 return compressed; 1990 } 1991 1992 /* convert the RMB size from compressed notation into integer */ 1993 int smc_uncompress_bufsize(u8 compressed) 1994 { 1995 u32 size; 1996 1997 size = 0x00000001 << (((int)compressed) + 14); 1998 return (int)size; 1999 } 2000 2001 /* try to reuse a sndbuf or rmb description slot for a certain 2002 * buffer size; if not available, return NULL 2003 */ 2004 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 2005 struct rw_semaphore *lock, 2006 struct list_head *buf_list) 2007 { 2008 struct smc_buf_desc *buf_slot; 2009 2010 down_read(lock); 2011 list_for_each_entry(buf_slot, buf_list, list) { 2012 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 2013 up_read(lock); 2014 return buf_slot; 2015 } 2016 } 2017 up_read(lock); 2018 return NULL; 2019 } 2020 2021 /* one of the conditions for announcing a receiver's current window size is 2022 * that it "results in a minimum increase in the window size of 10% of the 2023 * receive buffer space" [RFC7609] 2024 */ 2025 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2026 { 2027 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2028 } 2029 2030 /* map an buf to a link */ 2031 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2032 struct smc_link *lnk) 2033 { 2034 int rc, i, nents, offset, buf_size, size, access_flags; 2035 struct scatterlist *sg; 2036 void *buf; 2037 2038 if (buf_desc->is_map_ib[lnk->link_idx]) 2039 return 0; 2040 2041 if (buf_desc->is_vm) { 2042 buf = buf_desc->cpu_addr; 2043 buf_size = buf_desc->len; 2044 offset = offset_in_page(buf_desc->cpu_addr); 2045 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2046 } else { 2047 nents = 1; 2048 } 2049 2050 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2051 if (rc) 2052 return rc; 2053 2054 if (buf_desc->is_vm) { 2055 /* virtually contiguous buffer */ 2056 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2057 size = min_t(int, PAGE_SIZE - offset, buf_size); 2058 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2059 buf += size / sizeof(*buf); 2060 buf_size -= size; 2061 offset = 0; 2062 } 2063 } else { 2064 /* physically contiguous buffer */ 2065 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2066 buf_desc->cpu_addr, buf_desc->len); 2067 } 2068 2069 /* map sg table to DMA address */ 2070 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2071 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2072 /* SMC protocol depends on mapping to one DMA address only */ 2073 if (rc != nents) { 2074 rc = -EAGAIN; 2075 goto free_table; 2076 } 2077 2078 buf_desc->is_dma_need_sync |= 2079 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2080 2081 if (is_rmb || buf_desc->is_vm) { 2082 /* create a new memory region for the RMB or vzalloced sndbuf */ 2083 access_flags = is_rmb ? 2084 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2085 IB_ACCESS_LOCAL_WRITE; 2086 2087 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2088 buf_desc, lnk->link_idx); 2089 if (rc) 2090 goto buf_unmap; 2091 smc_ib_sync_sg_for_device(lnk, buf_desc, 2092 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2093 } 2094 buf_desc->is_map_ib[lnk->link_idx] = true; 2095 return 0; 2096 2097 buf_unmap: 2098 smc_ib_buf_unmap_sg(lnk, buf_desc, 2099 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2100 free_table: 2101 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2102 return rc; 2103 } 2104 2105 /* register a new buf on IB device, rmb or vzalloced sndbuf 2106 * must be called under lgr->llc_conf_mutex lock 2107 */ 2108 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2109 { 2110 if (list_empty(&link->lgr->list)) 2111 return -ENOLINK; 2112 if (!buf_desc->is_reg_mr[link->link_idx]) { 2113 /* register memory region for new buf */ 2114 if (buf_desc->is_vm) 2115 buf_desc->mr[link->link_idx]->iova = 2116 (uintptr_t)buf_desc->cpu_addr; 2117 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2118 buf_desc->is_reg_err = true; 2119 return -EFAULT; 2120 } 2121 buf_desc->is_reg_mr[link->link_idx] = true; 2122 } 2123 return 0; 2124 } 2125 2126 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct rw_semaphore *lock, 2127 struct list_head *lst, bool is_rmb) 2128 { 2129 struct smc_buf_desc *buf_desc, *bf; 2130 int rc = 0; 2131 2132 down_write(lock); 2133 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2134 if (!buf_desc->used) 2135 continue; 2136 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2137 if (rc) 2138 goto out; 2139 } 2140 out: 2141 up_write(lock); 2142 return rc; 2143 } 2144 2145 /* map all used buffers of lgr for a new link */ 2146 int smcr_buf_map_lgr(struct smc_link *lnk) 2147 { 2148 struct smc_link_group *lgr = lnk->lgr; 2149 int i, rc = 0; 2150 2151 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2152 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2153 &lgr->rmbs[i], true); 2154 if (rc) 2155 return rc; 2156 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2157 &lgr->sndbufs[i], false); 2158 if (rc) 2159 return rc; 2160 } 2161 return 0; 2162 } 2163 2164 /* register all used buffers of lgr for a new link, 2165 * must be called under lgr->llc_conf_mutex lock 2166 */ 2167 int smcr_buf_reg_lgr(struct smc_link *lnk) 2168 { 2169 struct smc_link_group *lgr = lnk->lgr; 2170 struct smc_buf_desc *buf_desc, *bf; 2171 int i, rc = 0; 2172 2173 /* reg all RMBs for a new link */ 2174 down_write(&lgr->rmbs_lock); 2175 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2176 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2177 if (!buf_desc->used) 2178 continue; 2179 rc = smcr_link_reg_buf(lnk, buf_desc); 2180 if (rc) { 2181 up_write(&lgr->rmbs_lock); 2182 return rc; 2183 } 2184 } 2185 } 2186 up_write(&lgr->rmbs_lock); 2187 2188 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2189 return rc; 2190 2191 /* reg all vzalloced sndbufs for a new link */ 2192 down_write(&lgr->sndbufs_lock); 2193 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2194 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2195 if (!buf_desc->used || !buf_desc->is_vm) 2196 continue; 2197 rc = smcr_link_reg_buf(lnk, buf_desc); 2198 if (rc) { 2199 up_write(&lgr->sndbufs_lock); 2200 return rc; 2201 } 2202 } 2203 } 2204 up_write(&lgr->sndbufs_lock); 2205 return rc; 2206 } 2207 2208 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2209 bool is_rmb, int bufsize) 2210 { 2211 struct smc_buf_desc *buf_desc; 2212 2213 /* try to alloc a new buffer */ 2214 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2215 if (!buf_desc) 2216 return ERR_PTR(-ENOMEM); 2217 2218 switch (lgr->buf_type) { 2219 case SMCR_PHYS_CONT_BUFS: 2220 case SMCR_MIXED_BUFS: 2221 buf_desc->order = get_order(bufsize); 2222 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2223 __GFP_NOMEMALLOC | __GFP_COMP | 2224 __GFP_NORETRY | __GFP_ZERO, 2225 buf_desc->order); 2226 if (buf_desc->pages) { 2227 buf_desc->cpu_addr = 2228 (void *)page_address(buf_desc->pages); 2229 buf_desc->len = bufsize; 2230 buf_desc->is_vm = false; 2231 break; 2232 } 2233 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2234 goto out; 2235 fallthrough; // try virtually continguous buf 2236 case SMCR_VIRT_CONT_BUFS: 2237 buf_desc->order = get_order(bufsize); 2238 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2239 if (!buf_desc->cpu_addr) 2240 goto out; 2241 buf_desc->pages = NULL; 2242 buf_desc->len = bufsize; 2243 buf_desc->is_vm = true; 2244 break; 2245 } 2246 return buf_desc; 2247 2248 out: 2249 kfree(buf_desc); 2250 return ERR_PTR(-EAGAIN); 2251 } 2252 2253 /* map buf_desc on all usable links, 2254 * unused buffers stay mapped as long as the link is up 2255 */ 2256 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2257 struct smc_buf_desc *buf_desc, bool is_rmb) 2258 { 2259 int i, rc = 0, cnt = 0; 2260 2261 /* protect against parallel link reconfiguration */ 2262 down_read(&lgr->llc_conf_mutex); 2263 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2264 struct smc_link *lnk = &lgr->lnk[i]; 2265 2266 if (!smc_link_usable(lnk)) 2267 continue; 2268 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2269 rc = -ENOMEM; 2270 goto out; 2271 } 2272 cnt++; 2273 } 2274 out: 2275 up_read(&lgr->llc_conf_mutex); 2276 if (!rc && !cnt) 2277 rc = -EINVAL; 2278 return rc; 2279 } 2280 2281 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2282 bool is_dmb, int bufsize) 2283 { 2284 struct smc_buf_desc *buf_desc; 2285 int rc; 2286 2287 /* try to alloc a new DMB */ 2288 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2289 if (!buf_desc) 2290 return ERR_PTR(-ENOMEM); 2291 if (is_dmb) { 2292 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2293 if (rc) { 2294 kfree(buf_desc); 2295 if (rc == -ENOMEM) 2296 return ERR_PTR(-EAGAIN); 2297 if (rc == -ENOSPC) 2298 return ERR_PTR(-ENOSPC); 2299 return ERR_PTR(-EIO); 2300 } 2301 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2302 /* CDC header stored in buf. So, pretend it was smaller */ 2303 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2304 } else { 2305 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2306 __GFP_NOWARN | __GFP_NORETRY | 2307 __GFP_NOMEMALLOC); 2308 if (!buf_desc->cpu_addr) { 2309 kfree(buf_desc); 2310 return ERR_PTR(-EAGAIN); 2311 } 2312 buf_desc->len = bufsize; 2313 } 2314 return buf_desc; 2315 } 2316 2317 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2318 { 2319 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2320 struct smc_connection *conn = &smc->conn; 2321 struct smc_link_group *lgr = conn->lgr; 2322 struct list_head *buf_list; 2323 int bufsize, bufsize_comp; 2324 struct rw_semaphore *lock; /* lock buffer list */ 2325 bool is_dgraded = false; 2326 2327 if (is_rmb) 2328 /* use socket recv buffer size (w/o overhead) as start value */ 2329 bufsize = smc->sk.sk_rcvbuf / 2; 2330 else 2331 /* use socket send buffer size (w/o overhead) as start value */ 2332 bufsize = smc->sk.sk_sndbuf / 2; 2333 2334 for (bufsize_comp = smc_compress_bufsize(bufsize, is_smcd, is_rmb); 2335 bufsize_comp >= 0; bufsize_comp--) { 2336 if (is_rmb) { 2337 lock = &lgr->rmbs_lock; 2338 buf_list = &lgr->rmbs[bufsize_comp]; 2339 } else { 2340 lock = &lgr->sndbufs_lock; 2341 buf_list = &lgr->sndbufs[bufsize_comp]; 2342 } 2343 bufsize = smc_uncompress_bufsize(bufsize_comp); 2344 2345 /* check for reusable slot in the link group */ 2346 buf_desc = smc_buf_get_slot(bufsize_comp, lock, buf_list); 2347 if (buf_desc) { 2348 buf_desc->is_dma_need_sync = 0; 2349 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2350 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2351 break; /* found reusable slot */ 2352 } 2353 2354 if (is_smcd) 2355 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2356 else 2357 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); 2358 2359 if (PTR_ERR(buf_desc) == -ENOMEM) 2360 break; 2361 if (IS_ERR(buf_desc)) { 2362 if (!is_dgraded) { 2363 is_dgraded = true; 2364 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2365 } 2366 continue; 2367 } 2368 2369 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2370 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2371 buf_desc->used = 1; 2372 down_write(lock); 2373 list_add(&buf_desc->list, buf_list); 2374 up_write(lock); 2375 break; /* found */ 2376 } 2377 2378 if (IS_ERR(buf_desc)) 2379 return PTR_ERR(buf_desc); 2380 2381 if (!is_smcd) { 2382 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2383 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2384 return -ENOMEM; 2385 } 2386 } 2387 2388 if (is_rmb) { 2389 conn->rmb_desc = buf_desc; 2390 conn->rmbe_size_comp = bufsize_comp; 2391 smc->sk.sk_rcvbuf = bufsize * 2; 2392 atomic_set(&conn->bytes_to_rcv, 0); 2393 conn->rmbe_update_limit = 2394 smc_rmb_wnd_update_limit(buf_desc->len); 2395 if (is_smcd) 2396 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2397 } else { 2398 conn->sndbuf_desc = buf_desc; 2399 smc->sk.sk_sndbuf = bufsize * 2; 2400 atomic_set(&conn->sndbuf_space, bufsize); 2401 } 2402 return 0; 2403 } 2404 2405 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2406 { 2407 if (!conn->sndbuf_desc->is_dma_need_sync) 2408 return; 2409 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2410 !smc_link_active(conn->lnk)) 2411 return; 2412 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2413 } 2414 2415 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2416 { 2417 int i; 2418 2419 if (!conn->rmb_desc->is_dma_need_sync) 2420 return; 2421 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2422 return; 2423 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2424 if (!smc_link_active(&conn->lgr->lnk[i])) 2425 continue; 2426 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2427 DMA_FROM_DEVICE); 2428 } 2429 } 2430 2431 /* create the send and receive buffer for an SMC socket; 2432 * receive buffers are called RMBs; 2433 * (even though the SMC protocol allows more than one RMB-element per RMB, 2434 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2435 * extra RMB for every connection in a link group 2436 */ 2437 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2438 { 2439 int rc; 2440 2441 /* create send buffer */ 2442 rc = __smc_buf_create(smc, is_smcd, false); 2443 if (rc) 2444 return rc; 2445 /* create rmb */ 2446 rc = __smc_buf_create(smc, is_smcd, true); 2447 if (rc) { 2448 down_write(&smc->conn.lgr->sndbufs_lock); 2449 list_del(&smc->conn.sndbuf_desc->list); 2450 up_write(&smc->conn.lgr->sndbufs_lock); 2451 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2452 smc->conn.sndbuf_desc = NULL; 2453 } 2454 return rc; 2455 } 2456 2457 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2458 { 2459 int i; 2460 2461 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2462 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2463 return i; 2464 } 2465 return -ENOSPC; 2466 } 2467 2468 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2469 u32 rkey) 2470 { 2471 int i; 2472 2473 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2474 if (test_bit(i, lgr->rtokens_used_mask) && 2475 lgr->rtokens[i][lnk_idx].rkey == rkey) 2476 return i; 2477 } 2478 return -ENOENT; 2479 } 2480 2481 /* set rtoken for a new link to an existing rmb */ 2482 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2483 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2484 { 2485 int rtok_idx; 2486 2487 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2488 if (rtok_idx == -ENOENT) 2489 return; 2490 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2491 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2492 } 2493 2494 /* set rtoken for a new link whose link_id is given */ 2495 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2496 __be64 nw_vaddr, __be32 nw_rkey) 2497 { 2498 u64 dma_addr = be64_to_cpu(nw_vaddr); 2499 u32 rkey = ntohl(nw_rkey); 2500 bool found = false; 2501 int link_idx; 2502 2503 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2504 if (lgr->lnk[link_idx].link_id == link_id) { 2505 found = true; 2506 break; 2507 } 2508 } 2509 if (!found) 2510 return; 2511 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2512 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2513 } 2514 2515 /* add a new rtoken from peer */ 2516 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2517 { 2518 struct smc_link_group *lgr = smc_get_lgr(lnk); 2519 u64 dma_addr = be64_to_cpu(nw_vaddr); 2520 u32 rkey = ntohl(nw_rkey); 2521 int i; 2522 2523 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2524 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2525 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2526 test_bit(i, lgr->rtokens_used_mask)) { 2527 /* already in list */ 2528 return i; 2529 } 2530 } 2531 i = smc_rmb_reserve_rtoken_idx(lgr); 2532 if (i < 0) 2533 return i; 2534 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2535 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2536 return i; 2537 } 2538 2539 /* delete an rtoken from all links */ 2540 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2541 { 2542 struct smc_link_group *lgr = smc_get_lgr(lnk); 2543 u32 rkey = ntohl(nw_rkey); 2544 int i, j; 2545 2546 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2547 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2548 test_bit(i, lgr->rtokens_used_mask)) { 2549 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2550 lgr->rtokens[i][j].rkey = 0; 2551 lgr->rtokens[i][j].dma_addr = 0; 2552 } 2553 clear_bit(i, lgr->rtokens_used_mask); 2554 return 0; 2555 } 2556 } 2557 return -ENOENT; 2558 } 2559 2560 /* save rkey and dma_addr received from peer during clc handshake */ 2561 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2562 struct smc_link *lnk, 2563 struct smc_clc_msg_accept_confirm *clc) 2564 { 2565 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2566 clc->r0.rmb_rkey); 2567 if (conn->rtoken_idx < 0) 2568 return conn->rtoken_idx; 2569 return 0; 2570 } 2571 2572 static void smc_core_going_away(void) 2573 { 2574 struct smc_ib_device *smcibdev; 2575 struct smcd_dev *smcd; 2576 2577 mutex_lock(&smc_ib_devices.mutex); 2578 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2579 int i; 2580 2581 for (i = 0; i < SMC_MAX_PORTS; i++) 2582 set_bit(i, smcibdev->ports_going_away); 2583 } 2584 mutex_unlock(&smc_ib_devices.mutex); 2585 2586 mutex_lock(&smcd_dev_list.mutex); 2587 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2588 smcd->going_away = 1; 2589 } 2590 mutex_unlock(&smcd_dev_list.mutex); 2591 } 2592 2593 /* Clean up all SMC link groups */ 2594 static void smc_lgrs_shutdown(void) 2595 { 2596 struct smcd_dev *smcd; 2597 2598 smc_core_going_away(); 2599 2600 smc_smcr_terminate_all(NULL); 2601 2602 mutex_lock(&smcd_dev_list.mutex); 2603 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2604 smc_smcd_terminate_all(smcd); 2605 mutex_unlock(&smcd_dev_list.mutex); 2606 } 2607 2608 static int smc_core_reboot_event(struct notifier_block *this, 2609 unsigned long event, void *ptr) 2610 { 2611 smc_lgrs_shutdown(); 2612 smc_ib_unregister_client(); 2613 smc_ism_exit(); 2614 return 0; 2615 } 2616 2617 static struct notifier_block smc_reboot_notifier = { 2618 .notifier_call = smc_core_reboot_event, 2619 }; 2620 2621 int __init smc_core_init(void) 2622 { 2623 return register_reboot_notifier(&smc_reboot_notifier); 2624 } 2625 2626 /* Called (from smc_exit) when module is removed */ 2627 void smc_core_exit(void) 2628 { 2629 unregister_reboot_notifier(&smc_reboot_notifier); 2630 smc_lgrs_shutdown(); 2631 } 2632