1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Basic Transport Functions exploiting Infiniband API 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 12 #include <linux/socket.h> 13 #include <linux/if_vlan.h> 14 #include <linux/random.h> 15 #include <linux/workqueue.h> 16 #include <linux/wait.h> 17 #include <linux/reboot.h> 18 #include <linux/mutex.h> 19 #include <linux/list.h> 20 #include <linux/smc.h> 21 #include <net/tcp.h> 22 #include <net/sock.h> 23 #include <rdma/ib_verbs.h> 24 #include <rdma/ib_cache.h> 25 26 #include "smc.h" 27 #include "smc_clc.h" 28 #include "smc_core.h" 29 #include "smc_ib.h" 30 #include "smc_wr.h" 31 #include "smc_llc.h" 32 #include "smc_cdc.h" 33 #include "smc_close.h" 34 #include "smc_ism.h" 35 #include "smc_netlink.h" 36 #include "smc_stats.h" 37 #include "smc_tracepoint.h" 38 39 #define SMC_LGR_NUM_INCR 256 40 #define SMC_LGR_FREE_DELAY_SERV (600 * HZ) 41 #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ) 42 43 struct smc_lgr_list smc_lgr_list = { /* established link groups */ 44 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), 45 .list = LIST_HEAD_INIT(smc_lgr_list.list), 46 .num = 0, 47 }; 48 49 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */ 50 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted); 51 52 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 53 struct smc_buf_desc *buf_desc); 54 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft); 55 56 static void smc_link_down_work(struct work_struct *work); 57 58 /* return head of link group list and its lock for a given link group */ 59 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr, 60 spinlock_t **lgr_lock) 61 { 62 if (lgr->is_smcd) { 63 *lgr_lock = &lgr->smcd->lgr_lock; 64 return &lgr->smcd->lgr_list; 65 } 66 67 *lgr_lock = &smc_lgr_list.lock; 68 return &smc_lgr_list.list; 69 } 70 71 static void smc_ibdev_cnt_inc(struct smc_link *lnk) 72 { 73 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]); 74 } 75 76 static void smc_ibdev_cnt_dec(struct smc_link *lnk) 77 { 78 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]); 79 } 80 81 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr) 82 { 83 /* client link group creation always follows the server link group 84 * creation. For client use a somewhat higher removal delay time, 85 * otherwise there is a risk of out-of-sync link groups. 86 */ 87 if (!lgr->freeing) { 88 mod_delayed_work(system_wq, &lgr->free_work, 89 (!lgr->is_smcd && lgr->role == SMC_CLNT) ? 90 SMC_LGR_FREE_DELAY_CLNT : 91 SMC_LGR_FREE_DELAY_SERV); 92 } 93 } 94 95 /* Register connection's alert token in our lookup structure. 96 * To use rbtrees we have to implement our own insert core. 97 * Requires @conns_lock 98 * @smc connection to register 99 * Returns 0 on success, != otherwise. 100 */ 101 static void smc_lgr_add_alert_token(struct smc_connection *conn) 102 { 103 struct rb_node **link, *parent = NULL; 104 u32 token = conn->alert_token_local; 105 106 link = &conn->lgr->conns_all.rb_node; 107 while (*link) { 108 struct smc_connection *cur = rb_entry(*link, 109 struct smc_connection, alert_node); 110 111 parent = *link; 112 if (cur->alert_token_local > token) 113 link = &parent->rb_left; 114 else 115 link = &parent->rb_right; 116 } 117 /* Put the new node there */ 118 rb_link_node(&conn->alert_node, parent, link); 119 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); 120 } 121 122 /* assign an SMC-R link to the connection */ 123 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first) 124 { 125 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING : 126 SMC_LNK_ACTIVE; 127 int i, j; 128 129 /* do link balancing */ 130 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 131 struct smc_link *lnk = &conn->lgr->lnk[i]; 132 133 if (lnk->state != expected || lnk->link_is_asym) 134 continue; 135 if (conn->lgr->role == SMC_CLNT) { 136 conn->lnk = lnk; /* temporary, SMC server assigns link*/ 137 break; 138 } 139 if (conn->lgr->conns_num % 2) { 140 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) { 141 struct smc_link *lnk2; 142 143 lnk2 = &conn->lgr->lnk[j]; 144 if (lnk2->state == expected && 145 !lnk2->link_is_asym) { 146 conn->lnk = lnk2; 147 break; 148 } 149 } 150 } 151 if (!conn->lnk) 152 conn->lnk = lnk; 153 break; 154 } 155 if (!conn->lnk) 156 return SMC_CLC_DECL_NOACTLINK; 157 atomic_inc(&conn->lnk->conn_cnt); 158 return 0; 159 } 160 161 /* Register connection in link group by assigning an alert token 162 * registered in a search tree. 163 * Requires @conns_lock 164 * Note that '0' is a reserved value and not assigned. 165 */ 166 static int smc_lgr_register_conn(struct smc_connection *conn, bool first) 167 { 168 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 169 static atomic_t nexttoken = ATOMIC_INIT(0); 170 int rc; 171 172 if (!conn->lgr->is_smcd) { 173 rc = smcr_lgr_conn_assign_link(conn, first); 174 if (rc) { 175 conn->lgr = NULL; 176 return rc; 177 } 178 } 179 /* find a new alert_token_local value not yet used by some connection 180 * in this link group 181 */ 182 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ 183 while (!conn->alert_token_local) { 184 conn->alert_token_local = atomic_inc_return(&nexttoken); 185 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) 186 conn->alert_token_local = 0; 187 } 188 smc_lgr_add_alert_token(conn); 189 conn->lgr->conns_num++; 190 return 0; 191 } 192 193 /* Unregister connection and reset the alert token of the given connection< 194 */ 195 static void __smc_lgr_unregister_conn(struct smc_connection *conn) 196 { 197 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 198 struct smc_link_group *lgr = conn->lgr; 199 200 rb_erase(&conn->alert_node, &lgr->conns_all); 201 if (conn->lnk) 202 atomic_dec(&conn->lnk->conn_cnt); 203 lgr->conns_num--; 204 conn->alert_token_local = 0; 205 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ 206 } 207 208 /* Unregister connection from lgr 209 */ 210 static void smc_lgr_unregister_conn(struct smc_connection *conn) 211 { 212 struct smc_link_group *lgr = conn->lgr; 213 214 if (!smc_conn_lgr_valid(conn)) 215 return; 216 write_lock_bh(&lgr->conns_lock); 217 if (conn->alert_token_local) { 218 __smc_lgr_unregister_conn(conn); 219 } 220 write_unlock_bh(&lgr->conns_lock); 221 } 222 223 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb) 224 { 225 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 226 char hostname[SMC_MAX_HOSTNAME_LEN + 1]; 227 char smc_seid[SMC_MAX_EID_LEN + 1]; 228 struct nlattr *attrs; 229 u8 *seid = NULL; 230 u8 *host = NULL; 231 void *nlh; 232 233 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 234 &smc_gen_nl_family, NLM_F_MULTI, 235 SMC_NETLINK_GET_SYS_INFO); 236 if (!nlh) 237 goto errmsg; 238 if (cb_ctx->pos[0]) 239 goto errout; 240 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO); 241 if (!attrs) 242 goto errout; 243 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2)) 244 goto errattr; 245 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE)) 246 goto errattr; 247 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable())) 248 goto errattr; 249 if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true)) 250 goto errattr; 251 smc_clc_get_hostname(&host); 252 if (host) { 253 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN); 254 hostname[SMC_MAX_HOSTNAME_LEN] = 0; 255 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname)) 256 goto errattr; 257 } 258 if (smc_ism_is_v2_capable()) { 259 smc_ism_get_system_eid(&seid); 260 memcpy(smc_seid, seid, SMC_MAX_EID_LEN); 261 smc_seid[SMC_MAX_EID_LEN] = 0; 262 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid)) 263 goto errattr; 264 } 265 nla_nest_end(skb, attrs); 266 genlmsg_end(skb, nlh); 267 cb_ctx->pos[0] = 1; 268 return skb->len; 269 270 errattr: 271 nla_nest_cancel(skb, attrs); 272 errout: 273 genlmsg_cancel(skb, nlh); 274 errmsg: 275 return skb->len; 276 } 277 278 /* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */ 279 static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr, 280 struct sk_buff *skb, 281 struct netlink_callback *cb, 282 struct nlattr *v2_attrs) 283 { 284 char smc_host[SMC_MAX_HOSTNAME_LEN + 1]; 285 char smc_eid[SMC_MAX_EID_LEN + 1]; 286 287 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version)) 288 goto errv2attr; 289 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release)) 290 goto errv2attr; 291 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os)) 292 goto errv2attr; 293 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN); 294 smc_host[SMC_MAX_HOSTNAME_LEN] = 0; 295 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host)) 296 goto errv2attr; 297 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN); 298 smc_eid[SMC_MAX_EID_LEN] = 0; 299 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid)) 300 goto errv2attr; 301 302 nla_nest_end(skb, v2_attrs); 303 return 0; 304 305 errv2attr: 306 nla_nest_cancel(skb, v2_attrs); 307 return -EMSGSIZE; 308 } 309 310 static int smc_nl_fill_smcr_lgr_v2(struct smc_link_group *lgr, 311 struct sk_buff *skb, 312 struct netlink_callback *cb) 313 { 314 struct nlattr *v2_attrs; 315 316 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2); 317 if (!v2_attrs) 318 goto errattr; 319 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_DIRECT, !lgr->uses_gateway)) 320 goto errv2attr; 321 322 nla_nest_end(skb, v2_attrs); 323 return 0; 324 325 errv2attr: 326 nla_nest_cancel(skb, v2_attrs); 327 errattr: 328 return -EMSGSIZE; 329 } 330 331 static int smc_nl_fill_lgr(struct smc_link_group *lgr, 332 struct sk_buff *skb, 333 struct netlink_callback *cb) 334 { 335 char smc_target[SMC_MAX_PNETID_LEN + 1]; 336 struct nlattr *attrs, *v2_attrs; 337 338 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR); 339 if (!attrs) 340 goto errout; 341 342 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id))) 343 goto errattr; 344 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num)) 345 goto errattr; 346 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role)) 347 goto errattr; 348 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type)) 349 goto errattr; 350 if (nla_put_u8(skb, SMC_NLA_LGR_R_BUF_TYPE, lgr->buf_type)) 351 goto errattr; 352 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id)) 353 goto errattr; 354 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE, 355 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD)) 356 goto errattr; 357 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN); 358 smc_target[SMC_MAX_PNETID_LEN] = 0; 359 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target)) 360 goto errattr; 361 if (lgr->smc_version > SMC_V1) { 362 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON); 363 if (!v2_attrs) 364 goto errattr; 365 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 366 goto errattr; 367 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb)) 368 goto errattr; 369 } 370 371 nla_nest_end(skb, attrs); 372 return 0; 373 errattr: 374 nla_nest_cancel(skb, attrs); 375 errout: 376 return -EMSGSIZE; 377 } 378 379 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr, 380 struct smc_link *link, 381 struct sk_buff *skb, 382 struct netlink_callback *cb) 383 { 384 char smc_ibname[IB_DEVICE_NAME_MAX]; 385 u8 smc_gid_target[41]; 386 struct nlattr *attrs; 387 u32 link_uid = 0; 388 void *nlh; 389 390 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 391 &smc_gen_nl_family, NLM_F_MULTI, 392 SMC_NETLINK_GET_LINK_SMCR); 393 if (!nlh) 394 goto errmsg; 395 396 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR); 397 if (!attrs) 398 goto errout; 399 400 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id)) 401 goto errattr; 402 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state)) 403 goto errattr; 404 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT, 405 atomic_read(&link->conn_cnt))) 406 goto errattr; 407 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport)) 408 goto errattr; 409 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx)) 410 goto errattr; 411 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname); 412 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname)) 413 goto errattr; 414 memcpy(&link_uid, link->link_uid, sizeof(link_uid)); 415 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid)) 416 goto errattr; 417 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid)); 418 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid)) 419 goto errattr; 420 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 421 smc_gid_be16_convert(smc_gid_target, link->gid); 422 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target)) 423 goto errattr; 424 memset(smc_gid_target, 0, sizeof(smc_gid_target)); 425 smc_gid_be16_convert(smc_gid_target, link->peer_gid); 426 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target)) 427 goto errattr; 428 429 nla_nest_end(skb, attrs); 430 genlmsg_end(skb, nlh); 431 return 0; 432 errattr: 433 nla_nest_cancel(skb, attrs); 434 errout: 435 genlmsg_cancel(skb, nlh); 436 errmsg: 437 return -EMSGSIZE; 438 } 439 440 static int smc_nl_handle_lgr(struct smc_link_group *lgr, 441 struct sk_buff *skb, 442 struct netlink_callback *cb, 443 bool list_links) 444 { 445 void *nlh; 446 int i; 447 448 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 449 &smc_gen_nl_family, NLM_F_MULTI, 450 SMC_NETLINK_GET_LGR_SMCR); 451 if (!nlh) 452 goto errmsg; 453 if (smc_nl_fill_lgr(lgr, skb, cb)) 454 goto errout; 455 456 genlmsg_end(skb, nlh); 457 if (!list_links) 458 goto out; 459 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 460 if (!smc_link_usable(&lgr->lnk[i])) 461 continue; 462 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb)) 463 goto errout; 464 } 465 out: 466 return 0; 467 468 errout: 469 genlmsg_cancel(skb, nlh); 470 errmsg: 471 return -EMSGSIZE; 472 } 473 474 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr, 475 struct sk_buff *skb, 476 struct netlink_callback *cb, 477 bool list_links) 478 { 479 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 480 struct smc_link_group *lgr; 481 int snum = cb_ctx->pos[0]; 482 int num = 0; 483 484 spin_lock_bh(&smc_lgr->lock); 485 list_for_each_entry(lgr, &smc_lgr->list, list) { 486 if (num < snum) 487 goto next; 488 if (smc_nl_handle_lgr(lgr, skb, cb, list_links)) 489 goto errout; 490 next: 491 num++; 492 } 493 errout: 494 spin_unlock_bh(&smc_lgr->lock); 495 cb_ctx->pos[0] = num; 496 } 497 498 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr, 499 struct sk_buff *skb, 500 struct netlink_callback *cb) 501 { 502 char smc_pnet[SMC_MAX_PNETID_LEN + 1]; 503 struct nlattr *attrs; 504 void *nlh; 505 506 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 507 &smc_gen_nl_family, NLM_F_MULTI, 508 SMC_NETLINK_GET_LGR_SMCD); 509 if (!nlh) 510 goto errmsg; 511 512 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD); 513 if (!attrs) 514 goto errout; 515 516 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id))) 517 goto errattr; 518 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid, 519 SMC_NLA_LGR_D_PAD)) 520 goto errattr; 521 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid, 522 SMC_NLA_LGR_D_PAD)) 523 goto errattr; 524 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id)) 525 goto errattr; 526 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num)) 527 goto errattr; 528 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd))) 529 goto errattr; 530 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN); 531 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 532 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet)) 533 goto errattr; 534 if (lgr->smc_version > SMC_V1) { 535 struct nlattr *v2_attrs; 536 537 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON); 538 if (!v2_attrs) 539 goto errattr; 540 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 541 goto errattr; 542 } 543 nla_nest_end(skb, attrs); 544 genlmsg_end(skb, nlh); 545 return 0; 546 547 errattr: 548 nla_nest_cancel(skb, attrs); 549 errout: 550 genlmsg_cancel(skb, nlh); 551 errmsg: 552 return -EMSGSIZE; 553 } 554 555 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev, 556 struct sk_buff *skb, 557 struct netlink_callback *cb) 558 { 559 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 560 struct smc_link_group *lgr; 561 int snum = cb_ctx->pos[1]; 562 int rc = 0, num = 0; 563 564 spin_lock_bh(&dev->lgr_lock); 565 list_for_each_entry(lgr, &dev->lgr_list, list) { 566 if (!lgr->is_smcd) 567 continue; 568 if (num < snum) 569 goto next; 570 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb); 571 if (rc) 572 goto errout; 573 next: 574 num++; 575 } 576 errout: 577 spin_unlock_bh(&dev->lgr_lock); 578 cb_ctx->pos[1] = num; 579 return rc; 580 } 581 582 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list, 583 struct sk_buff *skb, 584 struct netlink_callback *cb) 585 { 586 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 587 struct smcd_dev *smcd_dev; 588 int snum = cb_ctx->pos[0]; 589 int rc = 0, num = 0; 590 591 mutex_lock(&dev_list->mutex); 592 list_for_each_entry(smcd_dev, &dev_list->list, list) { 593 if (list_empty(&smcd_dev->lgr_list)) 594 continue; 595 if (num < snum) 596 goto next; 597 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb); 598 if (rc) 599 goto errout; 600 next: 601 num++; 602 } 603 errout: 604 mutex_unlock(&dev_list->mutex); 605 cb_ctx->pos[0] = num; 606 return rc; 607 } 608 609 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 610 { 611 bool list_links = false; 612 613 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 614 return skb->len; 615 } 616 617 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb) 618 { 619 bool list_links = true; 620 621 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 622 return skb->len; 623 } 624 625 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 626 { 627 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb); 628 return skb->len; 629 } 630 631 void smc_lgr_cleanup_early(struct smc_link_group *lgr) 632 { 633 spinlock_t *lgr_lock; 634 635 if (!lgr) 636 return; 637 638 smc_lgr_list_head(lgr, &lgr_lock); 639 spin_lock_bh(lgr_lock); 640 /* do not use this link group for new connections */ 641 if (!list_empty(&lgr->list)) 642 list_del_init(&lgr->list); 643 spin_unlock_bh(lgr_lock); 644 __smc_lgr_terminate(lgr, true); 645 } 646 647 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 648 { 649 int i; 650 651 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 652 struct smc_link *lnk = &lgr->lnk[i]; 653 654 if (smc_link_sendable(lnk)) 655 lnk->state = SMC_LNK_INACTIVE; 656 } 657 wake_up_all(&lgr->llc_msg_waiter); 658 wake_up_all(&lgr->llc_flow_waiter); 659 } 660 661 static void smc_lgr_free(struct smc_link_group *lgr); 662 663 static void smc_lgr_free_work(struct work_struct *work) 664 { 665 struct smc_link_group *lgr = container_of(to_delayed_work(work), 666 struct smc_link_group, 667 free_work); 668 spinlock_t *lgr_lock; 669 bool conns; 670 671 smc_lgr_list_head(lgr, &lgr_lock); 672 spin_lock_bh(lgr_lock); 673 if (lgr->freeing) { 674 spin_unlock_bh(lgr_lock); 675 return; 676 } 677 read_lock_bh(&lgr->conns_lock); 678 conns = RB_EMPTY_ROOT(&lgr->conns_all); 679 read_unlock_bh(&lgr->conns_lock); 680 if (!conns) { /* number of lgr connections is no longer zero */ 681 spin_unlock_bh(lgr_lock); 682 return; 683 } 684 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 685 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 686 spin_unlock_bh(lgr_lock); 687 cancel_delayed_work(&lgr->free_work); 688 689 if (!lgr->is_smcd && !lgr->terminating) 690 smc_llc_send_link_delete_all(lgr, true, 691 SMC_LLC_DEL_PROG_INIT_TERM); 692 if (lgr->is_smcd && !lgr->terminating) 693 smc_ism_signal_shutdown(lgr); 694 if (!lgr->is_smcd) 695 smcr_lgr_link_deactivate_all(lgr); 696 smc_lgr_free(lgr); 697 } 698 699 static void smc_lgr_terminate_work(struct work_struct *work) 700 { 701 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 702 terminate_work); 703 704 __smc_lgr_terminate(lgr, true); 705 } 706 707 /* return next unique link id for the lgr */ 708 static u8 smcr_next_link_id(struct smc_link_group *lgr) 709 { 710 u8 link_id; 711 int i; 712 713 while (1) { 714 again: 715 link_id = ++lgr->next_link_id; 716 if (!link_id) /* skip zero as link_id */ 717 link_id = ++lgr->next_link_id; 718 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 719 if (smc_link_usable(&lgr->lnk[i]) && 720 lgr->lnk[i].link_id == link_id) 721 goto again; 722 } 723 break; 724 } 725 return link_id; 726 } 727 728 static void smcr_copy_dev_info_to_link(struct smc_link *link) 729 { 730 struct smc_ib_device *smcibdev = link->smcibdev; 731 732 snprintf(link->ibname, sizeof(link->ibname), "%s", 733 smcibdev->ibdev->name); 734 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; 735 } 736 737 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 738 u8 link_idx, struct smc_init_info *ini) 739 { 740 struct smc_ib_device *smcibdev; 741 u8 rndvec[3]; 742 int rc; 743 744 if (lgr->smc_version == SMC_V2) { 745 lnk->smcibdev = ini->smcrv2.ib_dev_v2; 746 lnk->ibport = ini->smcrv2.ib_port_v2; 747 } else { 748 lnk->smcibdev = ini->ib_dev; 749 lnk->ibport = ini->ib_port; 750 } 751 get_device(&lnk->smcibdev->ibdev->dev); 752 atomic_inc(&lnk->smcibdev->lnk_cnt); 753 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 754 lnk->clearing = 0; 755 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 756 lnk->link_id = smcr_next_link_id(lgr); 757 lnk->lgr = lgr; 758 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 759 lnk->link_idx = link_idx; 760 lnk->wr_rx_id_compl = 0; 761 smc_ibdev_cnt_inc(lnk); 762 smcr_copy_dev_info_to_link(lnk); 763 atomic_set(&lnk->conn_cnt, 0); 764 smc_llc_link_set_uid(lnk); 765 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 766 if (!lnk->smcibdev->initialized) { 767 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 768 if (rc) 769 goto out; 770 } 771 get_random_bytes(rndvec, sizeof(rndvec)); 772 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 773 (rndvec[2] << 16); 774 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 775 ini->vlan_id, lnk->gid, &lnk->sgid_index, 776 lgr->smc_version == SMC_V2 ? 777 &ini->smcrv2 : NULL); 778 if (rc) 779 goto out; 780 rc = smc_llc_link_init(lnk); 781 if (rc) 782 goto out; 783 rc = smc_wr_alloc_link_mem(lnk); 784 if (rc) 785 goto clear_llc_lnk; 786 rc = smc_ib_create_protection_domain(lnk); 787 if (rc) 788 goto free_link_mem; 789 rc = smc_ib_create_queue_pair(lnk); 790 if (rc) 791 goto dealloc_pd; 792 rc = smc_wr_create_link(lnk); 793 if (rc) 794 goto destroy_qp; 795 lnk->state = SMC_LNK_ACTIVATING; 796 return 0; 797 798 destroy_qp: 799 smc_ib_destroy_queue_pair(lnk); 800 dealloc_pd: 801 smc_ib_dealloc_protection_domain(lnk); 802 free_link_mem: 803 smc_wr_free_link_mem(lnk); 804 clear_llc_lnk: 805 smc_llc_link_clear(lnk, false); 806 out: 807 smc_ibdev_cnt_dec(lnk); 808 put_device(&lnk->smcibdev->ibdev->dev); 809 smcibdev = lnk->smcibdev; 810 memset(lnk, 0, sizeof(struct smc_link)); 811 lnk->state = SMC_LNK_UNUSED; 812 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 813 wake_up(&smcibdev->lnks_deleted); 814 smc_lgr_put(lgr); /* lgr_hold above */ 815 return rc; 816 } 817 818 /* create a new SMC link group */ 819 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 820 { 821 struct smc_link_group *lgr; 822 struct list_head *lgr_list; 823 struct smc_link *lnk; 824 spinlock_t *lgr_lock; 825 u8 link_idx; 826 int rc = 0; 827 int i; 828 829 if (ini->is_smcd && ini->vlan_id) { 830 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 831 ini->vlan_id)) { 832 rc = SMC_CLC_DECL_ISMVLANERR; 833 goto out; 834 } 835 } 836 837 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 838 if (!lgr) { 839 rc = SMC_CLC_DECL_MEM; 840 goto ism_put_vlan; 841 } 842 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 843 SMC_LGR_ID_SIZE, &lgr->id); 844 if (!lgr->tx_wq) { 845 rc = -ENOMEM; 846 goto free_lgr; 847 } 848 lgr->is_smcd = ini->is_smcd; 849 lgr->sync_err = 0; 850 lgr->terminating = 0; 851 lgr->freeing = 0; 852 lgr->vlan_id = ini->vlan_id; 853 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 854 mutex_init(&lgr->sndbufs_lock); 855 mutex_init(&lgr->rmbs_lock); 856 rwlock_init(&lgr->conns_lock); 857 for (i = 0; i < SMC_RMBE_SIZES; i++) { 858 INIT_LIST_HEAD(&lgr->sndbufs[i]); 859 INIT_LIST_HEAD(&lgr->rmbs[i]); 860 } 861 lgr->next_link_id = 0; 862 smc_lgr_list.num += SMC_LGR_NUM_INCR; 863 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 864 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 865 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 866 lgr->conns_all = RB_ROOT; 867 if (ini->is_smcd) { 868 /* SMC-D specific settings */ 869 get_device(&ini->ism_dev[ini->ism_selected]->dev); 870 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected]; 871 lgr->smcd = ini->ism_dev[ini->ism_selected]; 872 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 873 lgr_lock = &lgr->smcd->lgr_lock; 874 lgr->smc_version = ini->smcd_version; 875 lgr->peer_shutdown = 0; 876 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 877 } else { 878 /* SMC-R specific settings */ 879 struct smc_ib_device *ibdev; 880 int ibport; 881 882 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 883 lgr->smc_version = ini->smcr_version; 884 memcpy(lgr->peer_systemid, ini->peer_systemid, 885 SMC_SYSTEMID_LEN); 886 if (lgr->smc_version == SMC_V2) { 887 ibdev = ini->smcrv2.ib_dev_v2; 888 ibport = ini->smcrv2.ib_port_v2; 889 lgr->saddr = ini->smcrv2.saddr; 890 lgr->uses_gateway = ini->smcrv2.uses_gateway; 891 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 892 ETH_ALEN); 893 } else { 894 ibdev = ini->ib_dev; 895 ibport = ini->ib_port; 896 } 897 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 898 SMC_MAX_PNETID_LEN); 899 rc = smc_wr_alloc_lgr_mem(lgr); 900 if (rc) 901 goto free_wq; 902 smc_llc_lgr_init(lgr, smc); 903 904 link_idx = SMC_SINGLE_LINK; 905 lnk = &lgr->lnk[link_idx]; 906 rc = smcr_link_init(lgr, lnk, link_idx, ini); 907 if (rc) { 908 smc_wr_free_lgr_mem(lgr); 909 goto free_wq; 910 } 911 lgr->net = smc_ib_net(lnk->smcibdev); 912 lgr_list = &smc_lgr_list.list; 913 lgr_lock = &smc_lgr_list.lock; 914 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 915 atomic_inc(&lgr_cnt); 916 } 917 smc->conn.lgr = lgr; 918 spin_lock_bh(lgr_lock); 919 list_add_tail(&lgr->list, lgr_list); 920 spin_unlock_bh(lgr_lock); 921 return 0; 922 923 free_wq: 924 destroy_workqueue(lgr->tx_wq); 925 free_lgr: 926 kfree(lgr); 927 ism_put_vlan: 928 if (ini->is_smcd && ini->vlan_id) 929 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 930 out: 931 if (rc < 0) { 932 if (rc == -ENOMEM) 933 rc = SMC_CLC_DECL_MEM; 934 else 935 rc = SMC_CLC_DECL_INTERR; 936 } 937 return rc; 938 } 939 940 static int smc_write_space(struct smc_connection *conn) 941 { 942 int buffer_len = conn->peer_rmbe_size; 943 union smc_host_cursor prod; 944 union smc_host_cursor cons; 945 int space; 946 947 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 948 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 949 /* determine rx_buf space */ 950 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 951 return space; 952 } 953 954 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 955 struct smc_wr_buf *wr_buf) 956 { 957 struct smc_connection *conn = &smc->conn; 958 union smc_host_cursor cons, fin; 959 int rc = 0; 960 int diff; 961 962 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 963 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 964 /* set prod cursor to old state, enforce tx_rdma_writes() */ 965 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 966 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 967 968 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 969 /* cons cursor advanced more than fin, and prod was set 970 * fin above, so now prod is smaller than cons. Fix that. 971 */ 972 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 973 smc_curs_add(conn->sndbuf_desc->len, 974 &conn->tx_curs_sent, diff); 975 smc_curs_add(conn->sndbuf_desc->len, 976 &conn->tx_curs_fin, diff); 977 978 smp_mb__before_atomic(); 979 atomic_add(diff, &conn->sndbuf_space); 980 smp_mb__after_atomic(); 981 982 smc_curs_add(conn->peer_rmbe_size, 983 &conn->local_tx_ctrl.prod, diff); 984 smc_curs_add(conn->peer_rmbe_size, 985 &conn->local_tx_ctrl_fin, diff); 986 } 987 /* recalculate, value is used by tx_rdma_writes() */ 988 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 989 990 if (smc->sk.sk_state != SMC_INIT && 991 smc->sk.sk_state != SMC_CLOSED) { 992 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 993 if (!rc) { 994 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 995 smc->sk.sk_data_ready(&smc->sk); 996 } 997 } else { 998 smc_wr_tx_put_slot(conn->lnk, 999 (struct smc_wr_tx_pend_priv *)pend); 1000 } 1001 return rc; 1002 } 1003 1004 void smc_switch_link_and_count(struct smc_connection *conn, 1005 struct smc_link *to_lnk) 1006 { 1007 atomic_dec(&conn->lnk->conn_cnt); 1008 /* link_hold in smc_conn_create() */ 1009 smcr_link_put(conn->lnk); 1010 conn->lnk = to_lnk; 1011 atomic_inc(&conn->lnk->conn_cnt); 1012 /* link_put in smc_conn_free() */ 1013 smcr_link_hold(conn->lnk); 1014 } 1015 1016 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1017 struct smc_link *from_lnk, bool is_dev_err) 1018 { 1019 struct smc_link *to_lnk = NULL; 1020 struct smc_cdc_tx_pend *pend; 1021 struct smc_connection *conn; 1022 struct smc_wr_buf *wr_buf; 1023 struct smc_sock *smc; 1024 struct rb_node *node; 1025 int i, rc = 0; 1026 1027 /* link is inactive, wake up tx waiters */ 1028 smc_wr_wakeup_tx_wait(from_lnk); 1029 1030 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1031 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1032 continue; 1033 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1034 from_lnk->ibport == lgr->lnk[i].ibport) { 1035 continue; 1036 } 1037 to_lnk = &lgr->lnk[i]; 1038 break; 1039 } 1040 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1041 smc_lgr_terminate_sched(lgr); 1042 return NULL; 1043 } 1044 again: 1045 read_lock_bh(&lgr->conns_lock); 1046 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1047 conn = rb_entry(node, struct smc_connection, alert_node); 1048 if (conn->lnk != from_lnk) 1049 continue; 1050 smc = container_of(conn, struct smc_sock, conn); 1051 /* conn->lnk not yet set in SMC_INIT state */ 1052 if (smc->sk.sk_state == SMC_INIT) 1053 continue; 1054 if (smc->sk.sk_state == SMC_CLOSED || 1055 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1056 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1057 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1058 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1059 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1060 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1061 smc->sk.sk_state == SMC_PEERABORTWAIT || 1062 smc->sk.sk_state == SMC_PROCESSABORT) { 1063 spin_lock_bh(&conn->send_lock); 1064 smc_switch_link_and_count(conn, to_lnk); 1065 spin_unlock_bh(&conn->send_lock); 1066 continue; 1067 } 1068 sock_hold(&smc->sk); 1069 read_unlock_bh(&lgr->conns_lock); 1070 /* pre-fetch buffer outside of send_lock, might sleep */ 1071 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1072 if (rc) 1073 goto err_out; 1074 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1075 spin_lock_bh(&conn->send_lock); 1076 smc_switch_link_and_count(conn, to_lnk); 1077 rc = smc_switch_cursor(smc, pend, wr_buf); 1078 spin_unlock_bh(&conn->send_lock); 1079 sock_put(&smc->sk); 1080 if (rc) 1081 goto err_out; 1082 goto again; 1083 } 1084 read_unlock_bh(&lgr->conns_lock); 1085 smc_wr_tx_link_put(to_lnk); 1086 return to_lnk; 1087 1088 err_out: 1089 smcr_link_down_cond_sched(to_lnk); 1090 smc_wr_tx_link_put(to_lnk); 1091 return NULL; 1092 } 1093 1094 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1095 struct smc_link_group *lgr) 1096 { 1097 struct mutex *lock; /* lock buffer list */ 1098 int rc; 1099 1100 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1101 /* unregister rmb with peer */ 1102 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1103 if (!rc) { 1104 /* protect against smc_llc_cli_rkey_exchange() */ 1105 mutex_lock(&lgr->llc_conf_mutex); 1106 smc_llc_do_delete_rkey(lgr, buf_desc); 1107 buf_desc->is_conf_rkey = false; 1108 mutex_unlock(&lgr->llc_conf_mutex); 1109 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1110 } 1111 } 1112 1113 if (buf_desc->is_reg_err) { 1114 /* buf registration failed, reuse not possible */ 1115 lock = is_rmb ? &lgr->rmbs_lock : 1116 &lgr->sndbufs_lock; 1117 mutex_lock(lock); 1118 list_del(&buf_desc->list); 1119 mutex_unlock(lock); 1120 1121 smc_buf_free(lgr, is_rmb, buf_desc); 1122 } else { 1123 buf_desc->used = 0; 1124 memset(buf_desc->cpu_addr, 0, buf_desc->len); 1125 } 1126 } 1127 1128 static void smc_buf_unuse(struct smc_connection *conn, 1129 struct smc_link_group *lgr) 1130 { 1131 if (conn->sndbuf_desc) { 1132 if (!lgr->is_smcd && conn->sndbuf_desc->is_vm) { 1133 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1134 } else { 1135 conn->sndbuf_desc->used = 0; 1136 memset(conn->sndbuf_desc->cpu_addr, 0, 1137 conn->sndbuf_desc->len); 1138 } 1139 } 1140 if (conn->rmb_desc) { 1141 if (!lgr->is_smcd) { 1142 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1143 } else { 1144 conn->rmb_desc->used = 0; 1145 memset(conn->rmb_desc->cpu_addr, 0, 1146 conn->rmb_desc->len + 1147 sizeof(struct smcd_cdc_msg)); 1148 } 1149 } 1150 } 1151 1152 /* remove a finished connection from its link group */ 1153 void smc_conn_free(struct smc_connection *conn) 1154 { 1155 struct smc_link_group *lgr = conn->lgr; 1156 1157 if (!lgr || conn->freed) 1158 /* Connection has never been registered in a 1159 * link group, or has already been freed. 1160 */ 1161 return; 1162 1163 conn->freed = 1; 1164 if (!smc_conn_lgr_valid(conn)) 1165 /* Connection has already unregistered from 1166 * link group. 1167 */ 1168 goto lgr_put; 1169 1170 if (lgr->is_smcd) { 1171 if (!list_empty(&lgr->list)) 1172 smc_ism_unset_conn(conn); 1173 tasklet_kill(&conn->rx_tsklet); 1174 } else { 1175 smc_cdc_wait_pend_tx_wr(conn); 1176 if (current_work() != &conn->abort_work) 1177 cancel_work_sync(&conn->abort_work); 1178 } 1179 if (!list_empty(&lgr->list)) { 1180 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1181 smc_lgr_unregister_conn(conn); 1182 } 1183 1184 if (!lgr->conns_num) 1185 smc_lgr_schedule_free_work(lgr); 1186 lgr_put: 1187 if (!lgr->is_smcd) 1188 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1189 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1190 } 1191 1192 /* unregister a link from a buf_desc */ 1193 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1194 struct smc_link *lnk) 1195 { 1196 if (is_rmb || buf_desc->is_vm) 1197 buf_desc->is_reg_mr[lnk->link_idx] = false; 1198 if (!buf_desc->is_map_ib[lnk->link_idx]) 1199 return; 1200 1201 if ((is_rmb || buf_desc->is_vm) && 1202 buf_desc->mr[lnk->link_idx]) { 1203 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1204 buf_desc->mr[lnk->link_idx] = NULL; 1205 } 1206 if (is_rmb) 1207 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1208 else 1209 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1210 1211 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1212 buf_desc->is_map_ib[lnk->link_idx] = false; 1213 } 1214 1215 /* unmap all buffers of lgr for a deleted link */ 1216 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1217 { 1218 struct smc_link_group *lgr = lnk->lgr; 1219 struct smc_buf_desc *buf_desc, *bf; 1220 int i; 1221 1222 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1223 mutex_lock(&lgr->rmbs_lock); 1224 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1225 smcr_buf_unmap_link(buf_desc, true, lnk); 1226 mutex_unlock(&lgr->rmbs_lock); 1227 mutex_lock(&lgr->sndbufs_lock); 1228 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1229 list) 1230 smcr_buf_unmap_link(buf_desc, false, lnk); 1231 mutex_unlock(&lgr->sndbufs_lock); 1232 } 1233 } 1234 1235 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1236 { 1237 struct smc_link_group *lgr = lnk->lgr; 1238 int i; 1239 1240 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1241 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1242 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1243 } 1244 } 1245 1246 static void __smcr_link_clear(struct smc_link *lnk) 1247 { 1248 struct smc_link_group *lgr = lnk->lgr; 1249 struct smc_ib_device *smcibdev; 1250 1251 smc_wr_free_link_mem(lnk); 1252 smc_ibdev_cnt_dec(lnk); 1253 put_device(&lnk->smcibdev->ibdev->dev); 1254 smcibdev = lnk->smcibdev; 1255 memset(lnk, 0, sizeof(struct smc_link)); 1256 lnk->state = SMC_LNK_UNUSED; 1257 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1258 wake_up(&smcibdev->lnks_deleted); 1259 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1260 } 1261 1262 /* must be called under lgr->llc_conf_mutex lock */ 1263 void smcr_link_clear(struct smc_link *lnk, bool log) 1264 { 1265 if (!lnk->lgr || lnk->clearing || 1266 lnk->state == SMC_LNK_UNUSED) 1267 return; 1268 lnk->clearing = 1; 1269 lnk->peer_qpn = 0; 1270 smc_llc_link_clear(lnk, log); 1271 smcr_buf_unmap_lgr(lnk); 1272 smcr_rtoken_clear_link(lnk); 1273 smc_ib_modify_qp_error(lnk); 1274 smc_wr_free_link(lnk); 1275 smc_ib_destroy_queue_pair(lnk); 1276 smc_ib_dealloc_protection_domain(lnk); 1277 smcr_link_put(lnk); /* theoretically last link_put */ 1278 } 1279 1280 void smcr_link_hold(struct smc_link *lnk) 1281 { 1282 refcount_inc(&lnk->refcnt); 1283 } 1284 1285 void smcr_link_put(struct smc_link *lnk) 1286 { 1287 if (refcount_dec_and_test(&lnk->refcnt)) 1288 __smcr_link_clear(lnk); 1289 } 1290 1291 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1292 struct smc_buf_desc *buf_desc) 1293 { 1294 int i; 1295 1296 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1297 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1298 1299 if (!buf_desc->is_vm && buf_desc->pages) 1300 __free_pages(buf_desc->pages, buf_desc->order); 1301 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1302 vfree(buf_desc->cpu_addr); 1303 kfree(buf_desc); 1304 } 1305 1306 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1307 struct smc_buf_desc *buf_desc) 1308 { 1309 if (is_dmb) { 1310 /* restore original buf len */ 1311 buf_desc->len += sizeof(struct smcd_cdc_msg); 1312 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1313 } else { 1314 kfree(buf_desc->cpu_addr); 1315 } 1316 kfree(buf_desc); 1317 } 1318 1319 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1320 struct smc_buf_desc *buf_desc) 1321 { 1322 if (lgr->is_smcd) 1323 smcd_buf_free(lgr, is_rmb, buf_desc); 1324 else 1325 smcr_buf_free(lgr, is_rmb, buf_desc); 1326 } 1327 1328 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1329 { 1330 struct smc_buf_desc *buf_desc, *bf_desc; 1331 struct list_head *buf_list; 1332 int i; 1333 1334 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1335 if (is_rmb) 1336 buf_list = &lgr->rmbs[i]; 1337 else 1338 buf_list = &lgr->sndbufs[i]; 1339 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1340 list) { 1341 list_del(&buf_desc->list); 1342 smc_buf_free(lgr, is_rmb, buf_desc); 1343 } 1344 } 1345 } 1346 1347 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1348 { 1349 /* free send buffers */ 1350 __smc_lgr_free_bufs(lgr, false); 1351 /* free rmbs */ 1352 __smc_lgr_free_bufs(lgr, true); 1353 } 1354 1355 /* won't be freed until no one accesses to lgr anymore */ 1356 static void __smc_lgr_free(struct smc_link_group *lgr) 1357 { 1358 smc_lgr_free_bufs(lgr); 1359 if (lgr->is_smcd) { 1360 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1361 wake_up(&lgr->smcd->lgrs_deleted); 1362 } else { 1363 smc_wr_free_lgr_mem(lgr); 1364 if (!atomic_dec_return(&lgr_cnt)) 1365 wake_up(&lgrs_deleted); 1366 } 1367 kfree(lgr); 1368 } 1369 1370 /* remove a link group */ 1371 static void smc_lgr_free(struct smc_link_group *lgr) 1372 { 1373 int i; 1374 1375 if (!lgr->is_smcd) { 1376 mutex_lock(&lgr->llc_conf_mutex); 1377 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1378 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1379 smcr_link_clear(&lgr->lnk[i], false); 1380 } 1381 mutex_unlock(&lgr->llc_conf_mutex); 1382 smc_llc_lgr_clear(lgr); 1383 } 1384 1385 destroy_workqueue(lgr->tx_wq); 1386 if (lgr->is_smcd) { 1387 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1388 put_device(&lgr->smcd->dev); 1389 } 1390 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1391 } 1392 1393 void smc_lgr_hold(struct smc_link_group *lgr) 1394 { 1395 refcount_inc(&lgr->refcnt); 1396 } 1397 1398 void smc_lgr_put(struct smc_link_group *lgr) 1399 { 1400 if (refcount_dec_and_test(&lgr->refcnt)) 1401 __smc_lgr_free(lgr); 1402 } 1403 1404 static void smc_sk_wake_ups(struct smc_sock *smc) 1405 { 1406 smc->sk.sk_write_space(&smc->sk); 1407 smc->sk.sk_data_ready(&smc->sk); 1408 smc->sk.sk_state_change(&smc->sk); 1409 } 1410 1411 /* kill a connection */ 1412 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1413 { 1414 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1415 1416 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1417 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1418 else 1419 smc_close_abort(conn); 1420 conn->killed = 1; 1421 smc->sk.sk_err = ECONNABORTED; 1422 smc_sk_wake_ups(smc); 1423 if (conn->lgr->is_smcd) { 1424 smc_ism_unset_conn(conn); 1425 if (soft) 1426 tasklet_kill(&conn->rx_tsklet); 1427 else 1428 tasklet_unlock_wait(&conn->rx_tsklet); 1429 } else { 1430 smc_cdc_wait_pend_tx_wr(conn); 1431 } 1432 smc_lgr_unregister_conn(conn); 1433 smc_close_active_abort(smc); 1434 } 1435 1436 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1437 { 1438 if (lgr->is_smcd) { 1439 smc_ism_signal_shutdown(lgr); 1440 } else { 1441 u32 rsn = lgr->llc_termination_rsn; 1442 1443 if (!rsn) 1444 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1445 smc_llc_send_link_delete_all(lgr, false, rsn); 1446 smcr_lgr_link_deactivate_all(lgr); 1447 } 1448 } 1449 1450 /* terminate link group 1451 * @soft: true if link group shutdown can take its time 1452 * false if immediate link group shutdown is required 1453 */ 1454 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1455 { 1456 struct smc_connection *conn; 1457 struct smc_sock *smc; 1458 struct rb_node *node; 1459 1460 if (lgr->terminating) 1461 return; /* lgr already terminating */ 1462 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1463 cancel_delayed_work_sync(&lgr->free_work); 1464 lgr->terminating = 1; 1465 1466 /* kill remaining link group connections */ 1467 read_lock_bh(&lgr->conns_lock); 1468 node = rb_first(&lgr->conns_all); 1469 while (node) { 1470 read_unlock_bh(&lgr->conns_lock); 1471 conn = rb_entry(node, struct smc_connection, alert_node); 1472 smc = container_of(conn, struct smc_sock, conn); 1473 sock_hold(&smc->sk); /* sock_put below */ 1474 lock_sock(&smc->sk); 1475 smc_conn_kill(conn, soft); 1476 release_sock(&smc->sk); 1477 sock_put(&smc->sk); /* sock_hold above */ 1478 read_lock_bh(&lgr->conns_lock); 1479 node = rb_first(&lgr->conns_all); 1480 } 1481 read_unlock_bh(&lgr->conns_lock); 1482 smc_lgr_cleanup(lgr); 1483 smc_lgr_free(lgr); 1484 } 1485 1486 /* unlink link group and schedule termination */ 1487 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1488 { 1489 spinlock_t *lgr_lock; 1490 1491 smc_lgr_list_head(lgr, &lgr_lock); 1492 spin_lock_bh(lgr_lock); 1493 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1494 spin_unlock_bh(lgr_lock); 1495 return; /* lgr already terminating */ 1496 } 1497 list_del_init(&lgr->list); 1498 lgr->freeing = 1; 1499 spin_unlock_bh(lgr_lock); 1500 schedule_work(&lgr->terminate_work); 1501 } 1502 1503 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1504 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan) 1505 { 1506 struct smc_link_group *lgr, *l; 1507 LIST_HEAD(lgr_free_list); 1508 1509 /* run common cleanup function and build free list */ 1510 spin_lock_bh(&dev->lgr_lock); 1511 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1512 if ((!peer_gid || lgr->peer_gid == peer_gid) && 1513 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1514 if (peer_gid) /* peer triggered termination */ 1515 lgr->peer_shutdown = 1; 1516 list_move(&lgr->list, &lgr_free_list); 1517 lgr->freeing = 1; 1518 } 1519 } 1520 spin_unlock_bh(&dev->lgr_lock); 1521 1522 /* cancel the regular free workers and actually free lgrs */ 1523 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1524 list_del_init(&lgr->list); 1525 schedule_work(&lgr->terminate_work); 1526 } 1527 } 1528 1529 /* Called when an SMCD device is removed or the smc module is unloaded */ 1530 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1531 { 1532 struct smc_link_group *lgr, *lg; 1533 LIST_HEAD(lgr_free_list); 1534 1535 spin_lock_bh(&smcd->lgr_lock); 1536 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1537 list_for_each_entry(lgr, &lgr_free_list, list) 1538 lgr->freeing = 1; 1539 spin_unlock_bh(&smcd->lgr_lock); 1540 1541 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1542 list_del_init(&lgr->list); 1543 __smc_lgr_terminate(lgr, false); 1544 } 1545 1546 if (atomic_read(&smcd->lgr_cnt)) 1547 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1548 } 1549 1550 /* Called when an SMCR device is removed or the smc module is unloaded. 1551 * If smcibdev is given, all SMCR link groups using this device are terminated. 1552 * If smcibdev is NULL, all SMCR link groups are terminated. 1553 */ 1554 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1555 { 1556 struct smc_link_group *lgr, *lg; 1557 LIST_HEAD(lgr_free_list); 1558 int i; 1559 1560 spin_lock_bh(&smc_lgr_list.lock); 1561 if (!smcibdev) { 1562 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1563 list_for_each_entry(lgr, &lgr_free_list, list) 1564 lgr->freeing = 1; 1565 } else { 1566 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1567 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1568 if (lgr->lnk[i].smcibdev == smcibdev) 1569 smcr_link_down_cond_sched(&lgr->lnk[i]); 1570 } 1571 } 1572 } 1573 spin_unlock_bh(&smc_lgr_list.lock); 1574 1575 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1576 list_del_init(&lgr->list); 1577 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1578 __smc_lgr_terminate(lgr, false); 1579 } 1580 1581 if (smcibdev) { 1582 if (atomic_read(&smcibdev->lnk_cnt)) 1583 wait_event(smcibdev->lnks_deleted, 1584 !atomic_read(&smcibdev->lnk_cnt)); 1585 } else { 1586 if (atomic_read(&lgr_cnt)) 1587 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1588 } 1589 } 1590 1591 /* set new lgr type and clear all asymmetric link tagging */ 1592 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1593 { 1594 char *lgr_type = ""; 1595 int i; 1596 1597 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1598 if (smc_link_usable(&lgr->lnk[i])) 1599 lgr->lnk[i].link_is_asym = false; 1600 if (lgr->type == new_type) 1601 return; 1602 lgr->type = new_type; 1603 1604 switch (lgr->type) { 1605 case SMC_LGR_NONE: 1606 lgr_type = "NONE"; 1607 break; 1608 case SMC_LGR_SINGLE: 1609 lgr_type = "SINGLE"; 1610 break; 1611 case SMC_LGR_SYMMETRIC: 1612 lgr_type = "SYMMETRIC"; 1613 break; 1614 case SMC_LGR_ASYMMETRIC_PEER: 1615 lgr_type = "ASYMMETRIC_PEER"; 1616 break; 1617 case SMC_LGR_ASYMMETRIC_LOCAL: 1618 lgr_type = "ASYMMETRIC_LOCAL"; 1619 break; 1620 } 1621 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1622 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1623 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1624 } 1625 1626 /* set new lgr type and tag a link as asymmetric */ 1627 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1628 enum smc_lgr_type new_type, int asym_lnk_idx) 1629 { 1630 smcr_lgr_set_type(lgr, new_type); 1631 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1632 } 1633 1634 /* abort connection, abort_work scheduled from tasklet context */ 1635 static void smc_conn_abort_work(struct work_struct *work) 1636 { 1637 struct smc_connection *conn = container_of(work, 1638 struct smc_connection, 1639 abort_work); 1640 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1641 1642 lock_sock(&smc->sk); 1643 smc_conn_kill(conn, true); 1644 release_sock(&smc->sk); 1645 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1646 } 1647 1648 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1649 { 1650 struct smc_link_group *lgr, *n; 1651 1652 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1653 struct smc_link *link; 1654 1655 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1656 SMC_MAX_PNETID_LEN) || 1657 lgr->type == SMC_LGR_SYMMETRIC || 1658 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1659 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1660 continue; 1661 1662 /* trigger local add link processing */ 1663 link = smc_llc_usable_link(lgr); 1664 if (link) 1665 smc_llc_add_link_local(link); 1666 } 1667 } 1668 1669 /* link is down - switch connections to alternate link, 1670 * must be called under lgr->llc_conf_mutex lock 1671 */ 1672 static void smcr_link_down(struct smc_link *lnk) 1673 { 1674 struct smc_link_group *lgr = lnk->lgr; 1675 struct smc_link *to_lnk; 1676 int del_link_id; 1677 1678 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1679 return; 1680 1681 to_lnk = smc_switch_conns(lgr, lnk, true); 1682 if (!to_lnk) { /* no backup link available */ 1683 smcr_link_clear(lnk, true); 1684 return; 1685 } 1686 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1687 del_link_id = lnk->link_id; 1688 1689 if (lgr->role == SMC_SERV) { 1690 /* trigger local delete link processing */ 1691 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1692 } else { 1693 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1694 /* another llc task is ongoing */ 1695 mutex_unlock(&lgr->llc_conf_mutex); 1696 wait_event_timeout(lgr->llc_flow_waiter, 1697 (list_empty(&lgr->list) || 1698 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1699 SMC_LLC_WAIT_TIME); 1700 mutex_lock(&lgr->llc_conf_mutex); 1701 } 1702 if (!list_empty(&lgr->list)) { 1703 smc_llc_send_delete_link(to_lnk, del_link_id, 1704 SMC_LLC_REQ, true, 1705 SMC_LLC_DEL_LOST_PATH); 1706 smcr_link_clear(lnk, true); 1707 } 1708 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1709 } 1710 } 1711 1712 /* must be called under lgr->llc_conf_mutex lock */ 1713 void smcr_link_down_cond(struct smc_link *lnk) 1714 { 1715 if (smc_link_downing(&lnk->state)) { 1716 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1717 smcr_link_down(lnk); 1718 } 1719 } 1720 1721 /* will get the lgr->llc_conf_mutex lock */ 1722 void smcr_link_down_cond_sched(struct smc_link *lnk) 1723 { 1724 if (smc_link_downing(&lnk->state)) { 1725 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1726 schedule_work(&lnk->link_down_wrk); 1727 } 1728 } 1729 1730 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1731 { 1732 struct smc_link_group *lgr, *n; 1733 int i; 1734 1735 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1736 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1737 SMC_MAX_PNETID_LEN)) 1738 continue; /* lgr is not affected */ 1739 if (list_empty(&lgr->list)) 1740 continue; 1741 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1742 struct smc_link *lnk = &lgr->lnk[i]; 1743 1744 if (smc_link_usable(lnk) && 1745 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1746 smcr_link_down_cond_sched(lnk); 1747 } 1748 } 1749 } 1750 1751 static void smc_link_down_work(struct work_struct *work) 1752 { 1753 struct smc_link *link = container_of(work, struct smc_link, 1754 link_down_wrk); 1755 struct smc_link_group *lgr = link->lgr; 1756 1757 if (list_empty(&lgr->list)) 1758 return; 1759 wake_up_all(&lgr->llc_msg_waiter); 1760 mutex_lock(&lgr->llc_conf_mutex); 1761 smcr_link_down(link); 1762 mutex_unlock(&lgr->llc_conf_mutex); 1763 } 1764 1765 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1766 struct netdev_nested_priv *priv) 1767 { 1768 unsigned short *vlan_id = (unsigned short *)priv->data; 1769 1770 if (is_vlan_dev(lower_dev)) { 1771 *vlan_id = vlan_dev_vlan_id(lower_dev); 1772 return 1; 1773 } 1774 1775 return 0; 1776 } 1777 1778 /* Determine vlan of internal TCP socket. */ 1779 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1780 { 1781 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1782 struct netdev_nested_priv priv; 1783 struct net_device *ndev; 1784 int rc = 0; 1785 1786 ini->vlan_id = 0; 1787 if (!dst) { 1788 rc = -ENOTCONN; 1789 goto out; 1790 } 1791 if (!dst->dev) { 1792 rc = -ENODEV; 1793 goto out_rel; 1794 } 1795 1796 ndev = dst->dev; 1797 if (is_vlan_dev(ndev)) { 1798 ini->vlan_id = vlan_dev_vlan_id(ndev); 1799 goto out_rel; 1800 } 1801 1802 priv.data = (void *)&ini->vlan_id; 1803 rtnl_lock(); 1804 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1805 rtnl_unlock(); 1806 1807 out_rel: 1808 dst_release(dst); 1809 out: 1810 return rc; 1811 } 1812 1813 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1814 u8 peer_systemid[], 1815 u8 peer_gid[], 1816 u8 peer_mac_v1[], 1817 enum smc_lgr_role role, u32 clcqpn, 1818 struct net *net) 1819 { 1820 struct smc_link *lnk; 1821 int i; 1822 1823 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1824 lgr->role != role) 1825 return false; 1826 1827 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1828 lnk = &lgr->lnk[i]; 1829 1830 if (!smc_link_active(lnk)) 1831 continue; 1832 /* use verbs API to check netns, instead of lgr->net */ 1833 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1834 return false; 1835 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1836 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1837 (smcr_version == SMC_V2 || 1838 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1839 return true; 1840 } 1841 return false; 1842 } 1843 1844 static bool smcd_lgr_match(struct smc_link_group *lgr, 1845 struct smcd_dev *smcismdev, u64 peer_gid) 1846 { 1847 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; 1848 } 1849 1850 /* create a new SMC connection (and a new link group if necessary) */ 1851 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1852 { 1853 struct smc_connection *conn = &smc->conn; 1854 struct net *net = sock_net(&smc->sk); 1855 struct list_head *lgr_list; 1856 struct smc_link_group *lgr; 1857 enum smc_lgr_role role; 1858 spinlock_t *lgr_lock; 1859 int rc = 0; 1860 1861 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1862 &smc_lgr_list.list; 1863 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1864 &smc_lgr_list.lock; 1865 ini->first_contact_local = 1; 1866 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1867 if (role == SMC_CLNT && ini->first_contact_peer) 1868 /* create new link group as well */ 1869 goto create; 1870 1871 /* determine if an existing link group can be reused */ 1872 spin_lock_bh(lgr_lock); 1873 list_for_each_entry(lgr, lgr_list, list) { 1874 write_lock_bh(&lgr->conns_lock); 1875 if ((ini->is_smcd ? 1876 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1877 ini->ism_peer_gid[ini->ism_selected]) : 1878 smcr_lgr_match(lgr, ini->smcr_version, 1879 ini->peer_systemid, 1880 ini->peer_gid, ini->peer_mac, role, 1881 ini->ib_clcqpn, net)) && 1882 !lgr->sync_err && 1883 (ini->smcd_version == SMC_V2 || 1884 lgr->vlan_id == ini->vlan_id) && 1885 (role == SMC_CLNT || ini->is_smcd || 1886 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX && 1887 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1888 /* link group found */ 1889 ini->first_contact_local = 0; 1890 conn->lgr = lgr; 1891 rc = smc_lgr_register_conn(conn, false); 1892 write_unlock_bh(&lgr->conns_lock); 1893 if (!rc && delayed_work_pending(&lgr->free_work)) 1894 cancel_delayed_work(&lgr->free_work); 1895 break; 1896 } 1897 write_unlock_bh(&lgr->conns_lock); 1898 } 1899 spin_unlock_bh(lgr_lock); 1900 if (rc) 1901 return rc; 1902 1903 if (role == SMC_CLNT && !ini->first_contact_peer && 1904 ini->first_contact_local) { 1905 /* Server reuses a link group, but Client wants to start 1906 * a new one 1907 * send out_of_sync decline, reason synchr. error 1908 */ 1909 return SMC_CLC_DECL_SYNCERR; 1910 } 1911 1912 create: 1913 if (ini->first_contact_local) { 1914 rc = smc_lgr_create(smc, ini); 1915 if (rc) 1916 goto out; 1917 lgr = conn->lgr; 1918 write_lock_bh(&lgr->conns_lock); 1919 rc = smc_lgr_register_conn(conn, true); 1920 write_unlock_bh(&lgr->conns_lock); 1921 if (rc) { 1922 smc_lgr_cleanup_early(lgr); 1923 goto out; 1924 } 1925 } 1926 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 1927 if (!conn->lgr->is_smcd) 1928 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 1929 conn->freed = 0; 1930 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 1931 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 1932 conn->urg_state = SMC_URG_READ; 1933 init_waitqueue_head(&conn->cdc_pend_tx_wq); 1934 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 1935 if (ini->is_smcd) { 1936 conn->rx_off = sizeof(struct smcd_cdc_msg); 1937 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 1938 } else { 1939 conn->rx_off = 0; 1940 } 1941 #ifndef KERNEL_HAS_ATOMIC64 1942 spin_lock_init(&conn->acurs_lock); 1943 #endif 1944 1945 out: 1946 return rc; 1947 } 1948 1949 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 1950 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */ 1951 1952 /* convert the RMB size into the compressed notation (minimum 16K, see 1953 * SMCD/R_DMBE_SIZES. 1954 * In contrast to plain ilog2, this rounds towards the next power of 2, 1955 * so the socket application gets at least its desired sndbuf / rcvbuf size. 1956 */ 1957 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 1958 { 1959 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE; 1960 u8 compressed; 1961 1962 if (size <= SMC_BUF_MIN_SIZE) 1963 return 0; 1964 1965 size = (size - 1) >> 14; /* convert to 16K multiple */ 1966 compressed = min_t(u8, ilog2(size) + 1, 1967 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 1968 1969 if (!is_smcd && is_rmb) 1970 /* RMBs are backed by & limited to max size of scatterlists */ 1971 compressed = min_t(u8, compressed, ilog2(max_scat >> 14)); 1972 1973 return compressed; 1974 } 1975 1976 /* convert the RMB size from compressed notation into integer */ 1977 int smc_uncompress_bufsize(u8 compressed) 1978 { 1979 u32 size; 1980 1981 size = 0x00000001 << (((int)compressed) + 14); 1982 return (int)size; 1983 } 1984 1985 /* try to reuse a sndbuf or rmb description slot for a certain 1986 * buffer size; if not available, return NULL 1987 */ 1988 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 1989 struct mutex *lock, 1990 struct list_head *buf_list) 1991 { 1992 struct smc_buf_desc *buf_slot; 1993 1994 mutex_lock(lock); 1995 list_for_each_entry(buf_slot, buf_list, list) { 1996 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 1997 mutex_unlock(lock); 1998 return buf_slot; 1999 } 2000 } 2001 mutex_unlock(lock); 2002 return NULL; 2003 } 2004 2005 /* one of the conditions for announcing a receiver's current window size is 2006 * that it "results in a minimum increase in the window size of 10% of the 2007 * receive buffer space" [RFC7609] 2008 */ 2009 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2010 { 2011 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2012 } 2013 2014 /* map an buf to a link */ 2015 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2016 struct smc_link *lnk) 2017 { 2018 int rc, i, nents, offset, buf_size, size, access_flags; 2019 struct scatterlist *sg; 2020 void *buf; 2021 2022 if (buf_desc->is_map_ib[lnk->link_idx]) 2023 return 0; 2024 2025 if (buf_desc->is_vm) { 2026 buf = buf_desc->cpu_addr; 2027 buf_size = buf_desc->len; 2028 offset = offset_in_page(buf_desc->cpu_addr); 2029 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2030 } else { 2031 nents = 1; 2032 } 2033 2034 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2035 if (rc) 2036 return rc; 2037 2038 if (buf_desc->is_vm) { 2039 /* virtually contiguous buffer */ 2040 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2041 size = min_t(int, PAGE_SIZE - offset, buf_size); 2042 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2043 buf += size / sizeof(*buf); 2044 buf_size -= size; 2045 offset = 0; 2046 } 2047 } else { 2048 /* physically contiguous buffer */ 2049 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2050 buf_desc->cpu_addr, buf_desc->len); 2051 } 2052 2053 /* map sg table to DMA address */ 2054 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2055 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2056 /* SMC protocol depends on mapping to one DMA address only */ 2057 if (rc != nents) { 2058 rc = -EAGAIN; 2059 goto free_table; 2060 } 2061 2062 buf_desc->is_dma_need_sync |= 2063 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2064 2065 if (is_rmb || buf_desc->is_vm) { 2066 /* create a new memory region for the RMB or vzalloced sndbuf */ 2067 access_flags = is_rmb ? 2068 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2069 IB_ACCESS_LOCAL_WRITE; 2070 2071 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2072 buf_desc, lnk->link_idx); 2073 if (rc) 2074 goto buf_unmap; 2075 smc_ib_sync_sg_for_device(lnk, buf_desc, 2076 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2077 } 2078 buf_desc->is_map_ib[lnk->link_idx] = true; 2079 return 0; 2080 2081 buf_unmap: 2082 smc_ib_buf_unmap_sg(lnk, buf_desc, 2083 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2084 free_table: 2085 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2086 return rc; 2087 } 2088 2089 /* register a new buf on IB device, rmb or vzalloced sndbuf 2090 * must be called under lgr->llc_conf_mutex lock 2091 */ 2092 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2093 { 2094 if (list_empty(&link->lgr->list)) 2095 return -ENOLINK; 2096 if (!buf_desc->is_reg_mr[link->link_idx]) { 2097 /* register memory region for new buf */ 2098 if (buf_desc->is_vm) 2099 buf_desc->mr[link->link_idx]->iova = 2100 (uintptr_t)buf_desc->cpu_addr; 2101 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2102 buf_desc->is_reg_err = true; 2103 return -EFAULT; 2104 } 2105 buf_desc->is_reg_mr[link->link_idx] = true; 2106 } 2107 return 0; 2108 } 2109 2110 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock, 2111 struct list_head *lst, bool is_rmb) 2112 { 2113 struct smc_buf_desc *buf_desc, *bf; 2114 int rc = 0; 2115 2116 mutex_lock(lock); 2117 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2118 if (!buf_desc->used) 2119 continue; 2120 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2121 if (rc) 2122 goto out; 2123 } 2124 out: 2125 mutex_unlock(lock); 2126 return rc; 2127 } 2128 2129 /* map all used buffers of lgr for a new link */ 2130 int smcr_buf_map_lgr(struct smc_link *lnk) 2131 { 2132 struct smc_link_group *lgr = lnk->lgr; 2133 int i, rc = 0; 2134 2135 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2136 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2137 &lgr->rmbs[i], true); 2138 if (rc) 2139 return rc; 2140 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2141 &lgr->sndbufs[i], false); 2142 if (rc) 2143 return rc; 2144 } 2145 return 0; 2146 } 2147 2148 /* register all used buffers of lgr for a new link, 2149 * must be called under lgr->llc_conf_mutex lock 2150 */ 2151 int smcr_buf_reg_lgr(struct smc_link *lnk) 2152 { 2153 struct smc_link_group *lgr = lnk->lgr; 2154 struct smc_buf_desc *buf_desc, *bf; 2155 int i, rc = 0; 2156 2157 /* reg all RMBs for a new link */ 2158 mutex_lock(&lgr->rmbs_lock); 2159 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2160 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2161 if (!buf_desc->used) 2162 continue; 2163 rc = smcr_link_reg_buf(lnk, buf_desc); 2164 if (rc) { 2165 mutex_unlock(&lgr->rmbs_lock); 2166 return rc; 2167 } 2168 } 2169 } 2170 mutex_unlock(&lgr->rmbs_lock); 2171 2172 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2173 return rc; 2174 2175 /* reg all vzalloced sndbufs for a new link */ 2176 mutex_lock(&lgr->sndbufs_lock); 2177 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2178 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2179 if (!buf_desc->used || !buf_desc->is_vm) 2180 continue; 2181 rc = smcr_link_reg_buf(lnk, buf_desc); 2182 if (rc) { 2183 mutex_unlock(&lgr->sndbufs_lock); 2184 return rc; 2185 } 2186 } 2187 } 2188 mutex_unlock(&lgr->sndbufs_lock); 2189 return rc; 2190 } 2191 2192 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2193 bool is_rmb, int bufsize) 2194 { 2195 struct smc_buf_desc *buf_desc; 2196 2197 /* try to alloc a new buffer */ 2198 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2199 if (!buf_desc) 2200 return ERR_PTR(-ENOMEM); 2201 2202 switch (lgr->buf_type) { 2203 case SMCR_PHYS_CONT_BUFS: 2204 case SMCR_MIXED_BUFS: 2205 buf_desc->order = get_order(bufsize); 2206 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2207 __GFP_NOMEMALLOC | __GFP_COMP | 2208 __GFP_NORETRY | __GFP_ZERO, 2209 buf_desc->order); 2210 if (buf_desc->pages) { 2211 buf_desc->cpu_addr = 2212 (void *)page_address(buf_desc->pages); 2213 buf_desc->len = bufsize; 2214 buf_desc->is_vm = false; 2215 break; 2216 } 2217 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2218 goto out; 2219 fallthrough; // try virtually continguous buf 2220 case SMCR_VIRT_CONT_BUFS: 2221 buf_desc->order = get_order(bufsize); 2222 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2223 if (!buf_desc->cpu_addr) 2224 goto out; 2225 buf_desc->pages = NULL; 2226 buf_desc->len = bufsize; 2227 buf_desc->is_vm = true; 2228 break; 2229 } 2230 return buf_desc; 2231 2232 out: 2233 kfree(buf_desc); 2234 return ERR_PTR(-EAGAIN); 2235 } 2236 2237 /* map buf_desc on all usable links, 2238 * unused buffers stay mapped as long as the link is up 2239 */ 2240 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2241 struct smc_buf_desc *buf_desc, bool is_rmb) 2242 { 2243 int i, rc = 0, cnt = 0; 2244 2245 /* protect against parallel link reconfiguration */ 2246 mutex_lock(&lgr->llc_conf_mutex); 2247 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2248 struct smc_link *lnk = &lgr->lnk[i]; 2249 2250 if (!smc_link_usable(lnk)) 2251 continue; 2252 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2253 rc = -ENOMEM; 2254 goto out; 2255 } 2256 cnt++; 2257 } 2258 out: 2259 mutex_unlock(&lgr->llc_conf_mutex); 2260 if (!rc && !cnt) 2261 rc = -EINVAL; 2262 return rc; 2263 } 2264 2265 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2266 bool is_dmb, int bufsize) 2267 { 2268 struct smc_buf_desc *buf_desc; 2269 int rc; 2270 2271 /* try to alloc a new DMB */ 2272 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2273 if (!buf_desc) 2274 return ERR_PTR(-ENOMEM); 2275 if (is_dmb) { 2276 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2277 if (rc) { 2278 kfree(buf_desc); 2279 if (rc == -ENOMEM) 2280 return ERR_PTR(-EAGAIN); 2281 if (rc == -ENOSPC) 2282 return ERR_PTR(-ENOSPC); 2283 return ERR_PTR(-EIO); 2284 } 2285 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2286 /* CDC header stored in buf. So, pretend it was smaller */ 2287 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2288 } else { 2289 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2290 __GFP_NOWARN | __GFP_NORETRY | 2291 __GFP_NOMEMALLOC); 2292 if (!buf_desc->cpu_addr) { 2293 kfree(buf_desc); 2294 return ERR_PTR(-EAGAIN); 2295 } 2296 buf_desc->len = bufsize; 2297 } 2298 return buf_desc; 2299 } 2300 2301 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2302 { 2303 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2304 struct smc_connection *conn = &smc->conn; 2305 struct smc_link_group *lgr = conn->lgr; 2306 struct list_head *buf_list; 2307 int bufsize, bufsize_short; 2308 bool is_dgraded = false; 2309 struct mutex *lock; /* lock buffer list */ 2310 int sk_buf_size; 2311 2312 if (is_rmb) 2313 /* use socket recv buffer size (w/o overhead) as start value */ 2314 sk_buf_size = smc->sk.sk_rcvbuf; 2315 else 2316 /* use socket send buffer size (w/o overhead) as start value */ 2317 sk_buf_size = smc->sk.sk_sndbuf; 2318 2319 for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb); 2320 bufsize_short >= 0; bufsize_short--) { 2321 if (is_rmb) { 2322 lock = &lgr->rmbs_lock; 2323 buf_list = &lgr->rmbs[bufsize_short]; 2324 } else { 2325 lock = &lgr->sndbufs_lock; 2326 buf_list = &lgr->sndbufs[bufsize_short]; 2327 } 2328 bufsize = smc_uncompress_bufsize(bufsize_short); 2329 2330 /* check for reusable slot in the link group */ 2331 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list); 2332 if (buf_desc) { 2333 buf_desc->is_dma_need_sync = 0; 2334 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2335 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2336 break; /* found reusable slot */ 2337 } 2338 2339 if (is_smcd) 2340 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2341 else 2342 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); 2343 2344 if (PTR_ERR(buf_desc) == -ENOMEM) 2345 break; 2346 if (IS_ERR(buf_desc)) { 2347 if (!is_dgraded) { 2348 is_dgraded = true; 2349 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2350 } 2351 continue; 2352 } 2353 2354 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2355 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2356 buf_desc->used = 1; 2357 mutex_lock(lock); 2358 list_add(&buf_desc->list, buf_list); 2359 mutex_unlock(lock); 2360 break; /* found */ 2361 } 2362 2363 if (IS_ERR(buf_desc)) 2364 return PTR_ERR(buf_desc); 2365 2366 if (!is_smcd) { 2367 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2368 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2369 return -ENOMEM; 2370 } 2371 } 2372 2373 if (is_rmb) { 2374 conn->rmb_desc = buf_desc; 2375 conn->rmbe_size_short = bufsize_short; 2376 smc->sk.sk_rcvbuf = bufsize; 2377 atomic_set(&conn->bytes_to_rcv, 0); 2378 conn->rmbe_update_limit = 2379 smc_rmb_wnd_update_limit(buf_desc->len); 2380 if (is_smcd) 2381 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2382 } else { 2383 conn->sndbuf_desc = buf_desc; 2384 smc->sk.sk_sndbuf = bufsize; 2385 atomic_set(&conn->sndbuf_space, bufsize); 2386 } 2387 return 0; 2388 } 2389 2390 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2391 { 2392 if (!conn->sndbuf_desc->is_dma_need_sync) 2393 return; 2394 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2395 !smc_link_active(conn->lnk)) 2396 return; 2397 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2398 } 2399 2400 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2401 { 2402 int i; 2403 2404 if (!conn->rmb_desc->is_dma_need_sync) 2405 return; 2406 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2407 return; 2408 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2409 if (!smc_link_active(&conn->lgr->lnk[i])) 2410 continue; 2411 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2412 DMA_FROM_DEVICE); 2413 } 2414 } 2415 2416 /* create the send and receive buffer for an SMC socket; 2417 * receive buffers are called RMBs; 2418 * (even though the SMC protocol allows more than one RMB-element per RMB, 2419 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2420 * extra RMB for every connection in a link group 2421 */ 2422 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2423 { 2424 int rc; 2425 2426 /* create send buffer */ 2427 rc = __smc_buf_create(smc, is_smcd, false); 2428 if (rc) 2429 return rc; 2430 /* create rmb */ 2431 rc = __smc_buf_create(smc, is_smcd, true); 2432 if (rc) { 2433 mutex_lock(&smc->conn.lgr->sndbufs_lock); 2434 list_del(&smc->conn.sndbuf_desc->list); 2435 mutex_unlock(&smc->conn.lgr->sndbufs_lock); 2436 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2437 smc->conn.sndbuf_desc = NULL; 2438 } 2439 return rc; 2440 } 2441 2442 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2443 { 2444 int i; 2445 2446 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2447 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2448 return i; 2449 } 2450 return -ENOSPC; 2451 } 2452 2453 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2454 u32 rkey) 2455 { 2456 int i; 2457 2458 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2459 if (test_bit(i, lgr->rtokens_used_mask) && 2460 lgr->rtokens[i][lnk_idx].rkey == rkey) 2461 return i; 2462 } 2463 return -ENOENT; 2464 } 2465 2466 /* set rtoken for a new link to an existing rmb */ 2467 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2468 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2469 { 2470 int rtok_idx; 2471 2472 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2473 if (rtok_idx == -ENOENT) 2474 return; 2475 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2476 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2477 } 2478 2479 /* set rtoken for a new link whose link_id is given */ 2480 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2481 __be64 nw_vaddr, __be32 nw_rkey) 2482 { 2483 u64 dma_addr = be64_to_cpu(nw_vaddr); 2484 u32 rkey = ntohl(nw_rkey); 2485 bool found = false; 2486 int link_idx; 2487 2488 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2489 if (lgr->lnk[link_idx].link_id == link_id) { 2490 found = true; 2491 break; 2492 } 2493 } 2494 if (!found) 2495 return; 2496 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2497 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2498 } 2499 2500 /* add a new rtoken from peer */ 2501 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2502 { 2503 struct smc_link_group *lgr = smc_get_lgr(lnk); 2504 u64 dma_addr = be64_to_cpu(nw_vaddr); 2505 u32 rkey = ntohl(nw_rkey); 2506 int i; 2507 2508 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2509 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2510 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2511 test_bit(i, lgr->rtokens_used_mask)) { 2512 /* already in list */ 2513 return i; 2514 } 2515 } 2516 i = smc_rmb_reserve_rtoken_idx(lgr); 2517 if (i < 0) 2518 return i; 2519 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2520 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2521 return i; 2522 } 2523 2524 /* delete an rtoken from all links */ 2525 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2526 { 2527 struct smc_link_group *lgr = smc_get_lgr(lnk); 2528 u32 rkey = ntohl(nw_rkey); 2529 int i, j; 2530 2531 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2532 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2533 test_bit(i, lgr->rtokens_used_mask)) { 2534 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2535 lgr->rtokens[i][j].rkey = 0; 2536 lgr->rtokens[i][j].dma_addr = 0; 2537 } 2538 clear_bit(i, lgr->rtokens_used_mask); 2539 return 0; 2540 } 2541 } 2542 return -ENOENT; 2543 } 2544 2545 /* save rkey and dma_addr received from peer during clc handshake */ 2546 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2547 struct smc_link *lnk, 2548 struct smc_clc_msg_accept_confirm *clc) 2549 { 2550 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2551 clc->r0.rmb_rkey); 2552 if (conn->rtoken_idx < 0) 2553 return conn->rtoken_idx; 2554 return 0; 2555 } 2556 2557 static void smc_core_going_away(void) 2558 { 2559 struct smc_ib_device *smcibdev; 2560 struct smcd_dev *smcd; 2561 2562 mutex_lock(&smc_ib_devices.mutex); 2563 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2564 int i; 2565 2566 for (i = 0; i < SMC_MAX_PORTS; i++) 2567 set_bit(i, smcibdev->ports_going_away); 2568 } 2569 mutex_unlock(&smc_ib_devices.mutex); 2570 2571 mutex_lock(&smcd_dev_list.mutex); 2572 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2573 smcd->going_away = 1; 2574 } 2575 mutex_unlock(&smcd_dev_list.mutex); 2576 } 2577 2578 /* Clean up all SMC link groups */ 2579 static void smc_lgrs_shutdown(void) 2580 { 2581 struct smcd_dev *smcd; 2582 2583 smc_core_going_away(); 2584 2585 smc_smcr_terminate_all(NULL); 2586 2587 mutex_lock(&smcd_dev_list.mutex); 2588 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2589 smc_smcd_terminate_all(smcd); 2590 mutex_unlock(&smcd_dev_list.mutex); 2591 } 2592 2593 static int smc_core_reboot_event(struct notifier_block *this, 2594 unsigned long event, void *ptr) 2595 { 2596 smc_lgrs_shutdown(); 2597 smc_ib_unregister_client(); 2598 return 0; 2599 } 2600 2601 static struct notifier_block smc_reboot_notifier = { 2602 .notifier_call = smc_core_reboot_event, 2603 }; 2604 2605 int __init smc_core_init(void) 2606 { 2607 return register_reboot_notifier(&smc_reboot_notifier); 2608 } 2609 2610 /* Called (from smc_exit) when module is removed */ 2611 void smc_core_exit(void) 2612 { 2613 unregister_reboot_notifier(&smc_reboot_notifier); 2614 smc_lgrs_shutdown(); 2615 } 2616