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 smcd_gid smcd_gid; 510 struct nlattr *attrs; 511 void *nlh; 512 513 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 514 &smc_gen_nl_family, NLM_F_MULTI, 515 SMC_NETLINK_GET_LGR_SMCD); 516 if (!nlh) 517 goto errmsg; 518 519 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD); 520 if (!attrs) 521 goto errout; 522 523 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id))) 524 goto errattr; 525 smcd->ops->get_local_gid(smcd, &smcd_gid); 526 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, 527 smcd_gid.gid, SMC_NLA_LGR_D_PAD)) 528 goto errattr; 529 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid.gid, 530 SMC_NLA_LGR_D_PAD)) 531 goto errattr; 532 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id)) 533 goto errattr; 534 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num)) 535 goto errattr; 536 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd))) 537 goto errattr; 538 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN); 539 smc_pnet[SMC_MAX_PNETID_LEN] = 0; 540 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet)) 541 goto errattr; 542 if (lgr->smc_version > SMC_V1) { 543 struct nlattr *v2_attrs; 544 545 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON); 546 if (!v2_attrs) 547 goto errattr; 548 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs)) 549 goto errattr; 550 } 551 nla_nest_end(skb, attrs); 552 genlmsg_end(skb, nlh); 553 return 0; 554 555 errattr: 556 nla_nest_cancel(skb, attrs); 557 errout: 558 genlmsg_cancel(skb, nlh); 559 errmsg: 560 return -EMSGSIZE; 561 } 562 563 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev, 564 struct sk_buff *skb, 565 struct netlink_callback *cb) 566 { 567 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 568 struct smc_link_group *lgr; 569 int snum = cb_ctx->pos[1]; 570 int rc = 0, num = 0; 571 572 spin_lock_bh(&dev->lgr_lock); 573 list_for_each_entry(lgr, &dev->lgr_list, list) { 574 if (!lgr->is_smcd) 575 continue; 576 if (num < snum) 577 goto next; 578 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb); 579 if (rc) 580 goto errout; 581 next: 582 num++; 583 } 584 errout: 585 spin_unlock_bh(&dev->lgr_lock); 586 cb_ctx->pos[1] = num; 587 return rc; 588 } 589 590 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list, 591 struct sk_buff *skb, 592 struct netlink_callback *cb) 593 { 594 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 595 struct smcd_dev *smcd_dev; 596 int snum = cb_ctx->pos[0]; 597 int rc = 0, num = 0; 598 599 mutex_lock(&dev_list->mutex); 600 list_for_each_entry(smcd_dev, &dev_list->list, list) { 601 if (list_empty(&smcd_dev->lgr_list)) 602 continue; 603 if (num < snum) 604 goto next; 605 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb); 606 if (rc) 607 goto errout; 608 next: 609 num++; 610 } 611 errout: 612 mutex_unlock(&dev_list->mutex); 613 cb_ctx->pos[0] = num; 614 return rc; 615 } 616 617 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 618 { 619 bool list_links = false; 620 621 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 622 return skb->len; 623 } 624 625 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb) 626 { 627 bool list_links = true; 628 629 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links); 630 return skb->len; 631 } 632 633 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb) 634 { 635 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb); 636 return skb->len; 637 } 638 639 void smc_lgr_cleanup_early(struct smc_link_group *lgr) 640 { 641 spinlock_t *lgr_lock; 642 643 if (!lgr) 644 return; 645 646 smc_lgr_list_head(lgr, &lgr_lock); 647 spin_lock_bh(lgr_lock); 648 /* do not use this link group for new connections */ 649 if (!list_empty(&lgr->list)) 650 list_del_init(&lgr->list); 651 spin_unlock_bh(lgr_lock); 652 __smc_lgr_terminate(lgr, true); 653 } 654 655 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 656 { 657 int i; 658 659 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 660 struct smc_link *lnk = &lgr->lnk[i]; 661 662 if (smc_link_sendable(lnk)) 663 lnk->state = SMC_LNK_INACTIVE; 664 } 665 wake_up_all(&lgr->llc_msg_waiter); 666 wake_up_all(&lgr->llc_flow_waiter); 667 } 668 669 static void smc_lgr_free(struct smc_link_group *lgr); 670 671 static void smc_lgr_free_work(struct work_struct *work) 672 { 673 struct smc_link_group *lgr = container_of(to_delayed_work(work), 674 struct smc_link_group, 675 free_work); 676 spinlock_t *lgr_lock; 677 bool conns; 678 679 smc_lgr_list_head(lgr, &lgr_lock); 680 spin_lock_bh(lgr_lock); 681 if (lgr->freeing) { 682 spin_unlock_bh(lgr_lock); 683 return; 684 } 685 read_lock_bh(&lgr->conns_lock); 686 conns = RB_EMPTY_ROOT(&lgr->conns_all); 687 read_unlock_bh(&lgr->conns_lock); 688 if (!conns) { /* number of lgr connections is no longer zero */ 689 spin_unlock_bh(lgr_lock); 690 return; 691 } 692 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 693 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 694 spin_unlock_bh(lgr_lock); 695 cancel_delayed_work(&lgr->free_work); 696 697 if (!lgr->is_smcd && !lgr->terminating) 698 smc_llc_send_link_delete_all(lgr, true, 699 SMC_LLC_DEL_PROG_INIT_TERM); 700 if (lgr->is_smcd && !lgr->terminating) 701 smc_ism_signal_shutdown(lgr); 702 if (!lgr->is_smcd) 703 smcr_lgr_link_deactivate_all(lgr); 704 smc_lgr_free(lgr); 705 } 706 707 static void smc_lgr_terminate_work(struct work_struct *work) 708 { 709 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 710 terminate_work); 711 712 __smc_lgr_terminate(lgr, true); 713 } 714 715 /* return next unique link id for the lgr */ 716 static u8 smcr_next_link_id(struct smc_link_group *lgr) 717 { 718 u8 link_id; 719 int i; 720 721 while (1) { 722 again: 723 link_id = ++lgr->next_link_id; 724 if (!link_id) /* skip zero as link_id */ 725 link_id = ++lgr->next_link_id; 726 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 727 if (smc_link_usable(&lgr->lnk[i]) && 728 lgr->lnk[i].link_id == link_id) 729 goto again; 730 } 731 break; 732 } 733 return link_id; 734 } 735 736 static void smcr_copy_dev_info_to_link(struct smc_link *link) 737 { 738 struct smc_ib_device *smcibdev = link->smcibdev; 739 740 snprintf(link->ibname, sizeof(link->ibname), "%s", 741 smcibdev->ibdev->name); 742 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1]; 743 } 744 745 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 746 u8 link_idx, struct smc_init_info *ini) 747 { 748 struct smc_ib_device *smcibdev; 749 u8 rndvec[3]; 750 int rc; 751 752 if (lgr->smc_version == SMC_V2) { 753 lnk->smcibdev = ini->smcrv2.ib_dev_v2; 754 lnk->ibport = ini->smcrv2.ib_port_v2; 755 } else { 756 lnk->smcibdev = ini->ib_dev; 757 lnk->ibport = ini->ib_port; 758 } 759 get_device(&lnk->smcibdev->ibdev->dev); 760 atomic_inc(&lnk->smcibdev->lnk_cnt); 761 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */ 762 lnk->clearing = 0; 763 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu; 764 lnk->link_id = smcr_next_link_id(lgr); 765 lnk->lgr = lgr; 766 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */ 767 lnk->link_idx = link_idx; 768 lnk->wr_rx_id_compl = 0; 769 smc_ibdev_cnt_inc(lnk); 770 smcr_copy_dev_info_to_link(lnk); 771 atomic_set(&lnk->conn_cnt, 0); 772 smc_llc_link_set_uid(lnk); 773 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 774 if (!lnk->smcibdev->initialized) { 775 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev); 776 if (rc) 777 goto out; 778 } 779 get_random_bytes(rndvec, sizeof(rndvec)); 780 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 781 (rndvec[2] << 16); 782 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 783 ini->vlan_id, lnk->gid, &lnk->sgid_index, 784 lgr->smc_version == SMC_V2 ? 785 &ini->smcrv2 : NULL); 786 if (rc) 787 goto out; 788 rc = smc_llc_link_init(lnk); 789 if (rc) 790 goto out; 791 rc = smc_wr_alloc_link_mem(lnk); 792 if (rc) 793 goto clear_llc_lnk; 794 rc = smc_ib_create_protection_domain(lnk); 795 if (rc) 796 goto free_link_mem; 797 rc = smc_ib_create_queue_pair(lnk); 798 if (rc) 799 goto dealloc_pd; 800 rc = smc_wr_create_link(lnk); 801 if (rc) 802 goto destroy_qp; 803 lnk->state = SMC_LNK_ACTIVATING; 804 return 0; 805 806 destroy_qp: 807 smc_ib_destroy_queue_pair(lnk); 808 dealloc_pd: 809 smc_ib_dealloc_protection_domain(lnk); 810 free_link_mem: 811 smc_wr_free_link_mem(lnk); 812 clear_llc_lnk: 813 smc_llc_link_clear(lnk, false); 814 out: 815 smc_ibdev_cnt_dec(lnk); 816 put_device(&lnk->smcibdev->ibdev->dev); 817 smcibdev = lnk->smcibdev; 818 memset(lnk, 0, sizeof(struct smc_link)); 819 lnk->state = SMC_LNK_UNUSED; 820 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 821 wake_up(&smcibdev->lnks_deleted); 822 smc_lgr_put(lgr); /* lgr_hold above */ 823 return rc; 824 } 825 826 /* create a new SMC link group */ 827 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 828 { 829 struct smc_link_group *lgr; 830 struct list_head *lgr_list; 831 struct smcd_dev *smcd; 832 struct smc_link *lnk; 833 spinlock_t *lgr_lock; 834 u8 link_idx; 835 int rc = 0; 836 int i; 837 838 if (ini->is_smcd && ini->vlan_id) { 839 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 840 ini->vlan_id)) { 841 rc = SMC_CLC_DECL_ISMVLANERR; 842 goto out; 843 } 844 } 845 846 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 847 if (!lgr) { 848 rc = SMC_CLC_DECL_MEM; 849 goto ism_put_vlan; 850 } 851 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 852 SMC_LGR_ID_SIZE, &lgr->id); 853 if (!lgr->tx_wq) { 854 rc = -ENOMEM; 855 goto free_lgr; 856 } 857 lgr->is_smcd = ini->is_smcd; 858 lgr->sync_err = 0; 859 lgr->terminating = 0; 860 lgr->freeing = 0; 861 lgr->vlan_id = ini->vlan_id; 862 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */ 863 init_rwsem(&lgr->sndbufs_lock); 864 init_rwsem(&lgr->rmbs_lock); 865 rwlock_init(&lgr->conns_lock); 866 for (i = 0; i < SMC_RMBE_SIZES; i++) { 867 INIT_LIST_HEAD(&lgr->sndbufs[i]); 868 INIT_LIST_HEAD(&lgr->rmbs[i]); 869 } 870 lgr->next_link_id = 0; 871 smc_lgr_list.num += SMC_LGR_NUM_INCR; 872 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 873 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 874 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 875 lgr->conns_all = RB_ROOT; 876 if (ini->is_smcd) { 877 /* SMC-D specific settings */ 878 smcd = ini->ism_dev[ini->ism_selected]; 879 get_device(smcd->ops->get_dev(smcd)); 880 lgr->peer_gid.gid = 881 ini->ism_peer_gid[ini->ism_selected].gid; 882 lgr->peer_gid.gid_ext = 883 ini->ism_peer_gid[ini->ism_selected].gid_ext; 884 lgr->smcd = ini->ism_dev[ini->ism_selected]; 885 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 886 lgr_lock = &lgr->smcd->lgr_lock; 887 lgr->smc_version = ini->smcd_version; 888 lgr->peer_shutdown = 0; 889 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 890 } else { 891 /* SMC-R specific settings */ 892 struct smc_ib_device *ibdev; 893 int ibport; 894 895 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 896 lgr->smc_version = ini->smcr_version; 897 memcpy(lgr->peer_systemid, ini->peer_systemid, 898 SMC_SYSTEMID_LEN); 899 if (lgr->smc_version == SMC_V2) { 900 ibdev = ini->smcrv2.ib_dev_v2; 901 ibport = ini->smcrv2.ib_port_v2; 902 lgr->saddr = ini->smcrv2.saddr; 903 lgr->uses_gateway = ini->smcrv2.uses_gateway; 904 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac, 905 ETH_ALEN); 906 lgr->max_conns = ini->max_conns; 907 lgr->max_links = ini->max_links; 908 } else { 909 ibdev = ini->ib_dev; 910 ibport = ini->ib_port; 911 lgr->max_conns = SMC_CONN_PER_LGR_MAX; 912 lgr->max_links = SMC_LINKS_ADD_LNK_MAX; 913 } 914 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1], 915 SMC_MAX_PNETID_LEN); 916 rc = smc_wr_alloc_lgr_mem(lgr); 917 if (rc) 918 goto free_wq; 919 smc_llc_lgr_init(lgr, smc); 920 921 link_idx = SMC_SINGLE_LINK; 922 lnk = &lgr->lnk[link_idx]; 923 rc = smcr_link_init(lgr, lnk, link_idx, ini); 924 if (rc) { 925 smc_wr_free_lgr_mem(lgr); 926 goto free_wq; 927 } 928 lgr->net = smc_ib_net(lnk->smcibdev); 929 lgr_list = &smc_lgr_list.list; 930 lgr_lock = &smc_lgr_list.lock; 931 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type; 932 atomic_inc(&lgr_cnt); 933 } 934 smc->conn.lgr = lgr; 935 spin_lock_bh(lgr_lock); 936 list_add_tail(&lgr->list, lgr_list); 937 spin_unlock_bh(lgr_lock); 938 return 0; 939 940 free_wq: 941 destroy_workqueue(lgr->tx_wq); 942 free_lgr: 943 kfree(lgr); 944 ism_put_vlan: 945 if (ini->is_smcd && ini->vlan_id) 946 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 947 out: 948 if (rc < 0) { 949 if (rc == -ENOMEM) 950 rc = SMC_CLC_DECL_MEM; 951 else 952 rc = SMC_CLC_DECL_INTERR; 953 } 954 return rc; 955 } 956 957 static int smc_write_space(struct smc_connection *conn) 958 { 959 int buffer_len = conn->peer_rmbe_size; 960 union smc_host_cursor prod; 961 union smc_host_cursor cons; 962 int space; 963 964 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 965 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 966 /* determine rx_buf space */ 967 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 968 return space; 969 } 970 971 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 972 struct smc_wr_buf *wr_buf) 973 { 974 struct smc_connection *conn = &smc->conn; 975 union smc_host_cursor cons, fin; 976 int rc = 0; 977 int diff; 978 979 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 980 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 981 /* set prod cursor to old state, enforce tx_rdma_writes() */ 982 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 983 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 984 985 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 986 /* cons cursor advanced more than fin, and prod was set 987 * fin above, so now prod is smaller than cons. Fix that. 988 */ 989 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 990 smc_curs_add(conn->sndbuf_desc->len, 991 &conn->tx_curs_sent, diff); 992 smc_curs_add(conn->sndbuf_desc->len, 993 &conn->tx_curs_fin, diff); 994 995 smp_mb__before_atomic(); 996 atomic_add(diff, &conn->sndbuf_space); 997 smp_mb__after_atomic(); 998 999 smc_curs_add(conn->peer_rmbe_size, 1000 &conn->local_tx_ctrl.prod, diff); 1001 smc_curs_add(conn->peer_rmbe_size, 1002 &conn->local_tx_ctrl_fin, diff); 1003 } 1004 /* recalculate, value is used by tx_rdma_writes() */ 1005 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 1006 1007 if (smc->sk.sk_state != SMC_INIT && 1008 smc->sk.sk_state != SMC_CLOSED) { 1009 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 1010 if (!rc) { 1011 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 1012 smc->sk.sk_data_ready(&smc->sk); 1013 } 1014 } else { 1015 smc_wr_tx_put_slot(conn->lnk, 1016 (struct smc_wr_tx_pend_priv *)pend); 1017 } 1018 return rc; 1019 } 1020 1021 void smc_switch_link_and_count(struct smc_connection *conn, 1022 struct smc_link *to_lnk) 1023 { 1024 atomic_dec(&conn->lnk->conn_cnt); 1025 /* link_hold in smc_conn_create() */ 1026 smcr_link_put(conn->lnk); 1027 conn->lnk = to_lnk; 1028 atomic_inc(&conn->lnk->conn_cnt); 1029 /* link_put in smc_conn_free() */ 1030 smcr_link_hold(conn->lnk); 1031 } 1032 1033 struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 1034 struct smc_link *from_lnk, bool is_dev_err) 1035 { 1036 struct smc_link *to_lnk = NULL; 1037 struct smc_cdc_tx_pend *pend; 1038 struct smc_connection *conn; 1039 struct smc_wr_buf *wr_buf; 1040 struct smc_sock *smc; 1041 struct rb_node *node; 1042 int i, rc = 0; 1043 1044 /* link is inactive, wake up tx waiters */ 1045 smc_wr_wakeup_tx_wait(from_lnk); 1046 1047 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1048 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 1049 continue; 1050 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 1051 from_lnk->ibport == lgr->lnk[i].ibport) { 1052 continue; 1053 } 1054 to_lnk = &lgr->lnk[i]; 1055 break; 1056 } 1057 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 1058 smc_lgr_terminate_sched(lgr); 1059 return NULL; 1060 } 1061 again: 1062 read_lock_bh(&lgr->conns_lock); 1063 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 1064 conn = rb_entry(node, struct smc_connection, alert_node); 1065 if (conn->lnk != from_lnk) 1066 continue; 1067 smc = container_of(conn, struct smc_sock, conn); 1068 /* conn->lnk not yet set in SMC_INIT state */ 1069 if (smc->sk.sk_state == SMC_INIT) 1070 continue; 1071 if (smc->sk.sk_state == SMC_CLOSED || 1072 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 1073 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 1074 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 1075 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 1076 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 1077 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 1078 smc->sk.sk_state == SMC_PEERABORTWAIT || 1079 smc->sk.sk_state == SMC_PROCESSABORT) { 1080 spin_lock_bh(&conn->send_lock); 1081 smc_switch_link_and_count(conn, to_lnk); 1082 spin_unlock_bh(&conn->send_lock); 1083 continue; 1084 } 1085 sock_hold(&smc->sk); 1086 read_unlock_bh(&lgr->conns_lock); 1087 /* pre-fetch buffer outside of send_lock, might sleep */ 1088 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 1089 if (rc) 1090 goto err_out; 1091 /* avoid race with smcr_tx_sndbuf_nonempty() */ 1092 spin_lock_bh(&conn->send_lock); 1093 smc_switch_link_and_count(conn, to_lnk); 1094 rc = smc_switch_cursor(smc, pend, wr_buf); 1095 spin_unlock_bh(&conn->send_lock); 1096 sock_put(&smc->sk); 1097 if (rc) 1098 goto err_out; 1099 goto again; 1100 } 1101 read_unlock_bh(&lgr->conns_lock); 1102 smc_wr_tx_link_put(to_lnk); 1103 return to_lnk; 1104 1105 err_out: 1106 smcr_link_down_cond_sched(to_lnk); 1107 smc_wr_tx_link_put(to_lnk); 1108 return NULL; 1109 } 1110 1111 static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb, 1112 struct smc_link_group *lgr) 1113 { 1114 struct rw_semaphore *lock; /* lock buffer list */ 1115 int rc; 1116 1117 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) { 1118 /* unregister rmb with peer */ 1119 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 1120 if (!rc) { 1121 /* protect against smc_llc_cli_rkey_exchange() */ 1122 down_read(&lgr->llc_conf_mutex); 1123 smc_llc_do_delete_rkey(lgr, buf_desc); 1124 buf_desc->is_conf_rkey = false; 1125 up_read(&lgr->llc_conf_mutex); 1126 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 1127 } 1128 } 1129 1130 if (buf_desc->is_reg_err) { 1131 /* buf registration failed, reuse not possible */ 1132 lock = is_rmb ? &lgr->rmbs_lock : 1133 &lgr->sndbufs_lock; 1134 down_write(lock); 1135 list_del(&buf_desc->list); 1136 up_write(lock); 1137 1138 smc_buf_free(lgr, is_rmb, buf_desc); 1139 } else { 1140 /* memzero_explicit provides potential memory barrier semantics */ 1141 memzero_explicit(buf_desc->cpu_addr, buf_desc->len); 1142 WRITE_ONCE(buf_desc->used, 0); 1143 } 1144 } 1145 1146 static void smcd_buf_detach(struct smc_connection *conn) 1147 { 1148 struct smcd_dev *smcd = conn->lgr->smcd; 1149 u64 peer_token = conn->peer_token; 1150 1151 if (!conn->sndbuf_desc) 1152 return; 1153 1154 smc_ism_detach_dmb(smcd, peer_token); 1155 1156 kfree(conn->sndbuf_desc); 1157 conn->sndbuf_desc = NULL; 1158 } 1159 1160 static void smc_buf_unuse(struct smc_connection *conn, 1161 struct smc_link_group *lgr) 1162 { 1163 if (conn->sndbuf_desc) { 1164 if (!lgr->is_smcd && conn->sndbuf_desc->is_vm) { 1165 smcr_buf_unuse(conn->sndbuf_desc, false, lgr); 1166 } else { 1167 memzero_explicit(conn->sndbuf_desc->cpu_addr, conn->sndbuf_desc->len); 1168 WRITE_ONCE(conn->sndbuf_desc->used, 0); 1169 } 1170 } 1171 if (conn->rmb_desc) { 1172 if (!lgr->is_smcd) { 1173 smcr_buf_unuse(conn->rmb_desc, true, lgr); 1174 } else { 1175 memzero_explicit(conn->rmb_desc->cpu_addr, 1176 conn->rmb_desc->len + sizeof(struct smcd_cdc_msg)); 1177 WRITE_ONCE(conn->rmb_desc->used, 0); 1178 } 1179 } 1180 } 1181 1182 /* remove a finished connection from its link group */ 1183 void smc_conn_free(struct smc_connection *conn) 1184 { 1185 struct smc_link_group *lgr = conn->lgr; 1186 1187 if (!lgr || conn->freed) 1188 /* Connection has never been registered in a 1189 * link group, or has already been freed. 1190 */ 1191 return; 1192 1193 conn->freed = 1; 1194 if (!smc_conn_lgr_valid(conn)) 1195 /* Connection has already unregistered from 1196 * link group. 1197 */ 1198 goto lgr_put; 1199 1200 if (lgr->is_smcd) { 1201 if (!list_empty(&lgr->list)) 1202 smc_ism_unset_conn(conn); 1203 if (smc_ism_support_dmb_nocopy(lgr->smcd)) 1204 smcd_buf_detach(conn); 1205 tasklet_kill(&conn->rx_tsklet); 1206 } else { 1207 smc_cdc_wait_pend_tx_wr(conn); 1208 if (current_work() != &conn->abort_work) 1209 cancel_work_sync(&conn->abort_work); 1210 } 1211 if (!list_empty(&lgr->list)) { 1212 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 1213 smc_lgr_unregister_conn(conn); 1214 } 1215 1216 if (!lgr->conns_num) 1217 smc_lgr_schedule_free_work(lgr); 1218 lgr_put: 1219 if (!lgr->is_smcd) 1220 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */ 1221 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */ 1222 } 1223 1224 /* unregister a link from a buf_desc */ 1225 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1226 struct smc_link *lnk) 1227 { 1228 if (is_rmb || buf_desc->is_vm) 1229 buf_desc->is_reg_mr[lnk->link_idx] = false; 1230 if (!buf_desc->is_map_ib[lnk->link_idx]) 1231 return; 1232 1233 if ((is_rmb || buf_desc->is_vm) && 1234 buf_desc->mr[lnk->link_idx]) { 1235 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]); 1236 buf_desc->mr[lnk->link_idx] = NULL; 1237 } 1238 if (is_rmb) 1239 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 1240 else 1241 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 1242 1243 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1244 buf_desc->is_map_ib[lnk->link_idx] = false; 1245 } 1246 1247 /* unmap all buffers of lgr for a deleted link */ 1248 static void smcr_buf_unmap_lgr(struct smc_link *lnk) 1249 { 1250 struct smc_link_group *lgr = lnk->lgr; 1251 struct smc_buf_desc *buf_desc, *bf; 1252 int i; 1253 1254 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1255 down_write(&lgr->rmbs_lock); 1256 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 1257 smcr_buf_unmap_link(buf_desc, true, lnk); 1258 up_write(&lgr->rmbs_lock); 1259 1260 down_write(&lgr->sndbufs_lock); 1261 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 1262 list) 1263 smcr_buf_unmap_link(buf_desc, false, lnk); 1264 up_write(&lgr->sndbufs_lock); 1265 } 1266 } 1267 1268 static void smcr_rtoken_clear_link(struct smc_link *lnk) 1269 { 1270 struct smc_link_group *lgr = lnk->lgr; 1271 int i; 1272 1273 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1274 lgr->rtokens[i][lnk->link_idx].rkey = 0; 1275 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 1276 } 1277 } 1278 1279 static void __smcr_link_clear(struct smc_link *lnk) 1280 { 1281 struct smc_link_group *lgr = lnk->lgr; 1282 struct smc_ib_device *smcibdev; 1283 1284 smc_wr_free_link_mem(lnk); 1285 smc_ibdev_cnt_dec(lnk); 1286 put_device(&lnk->smcibdev->ibdev->dev); 1287 smcibdev = lnk->smcibdev; 1288 memset(lnk, 0, sizeof(struct smc_link)); 1289 lnk->state = SMC_LNK_UNUSED; 1290 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 1291 wake_up(&smcibdev->lnks_deleted); 1292 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */ 1293 } 1294 1295 /* must be called under lgr->llc_conf_mutex lock */ 1296 void smcr_link_clear(struct smc_link *lnk, bool log) 1297 { 1298 if (!lnk->lgr || lnk->clearing || 1299 lnk->state == SMC_LNK_UNUSED) 1300 return; 1301 lnk->clearing = 1; 1302 lnk->peer_qpn = 0; 1303 smc_llc_link_clear(lnk, log); 1304 smcr_buf_unmap_lgr(lnk); 1305 smcr_rtoken_clear_link(lnk); 1306 smc_ib_modify_qp_error(lnk); 1307 smc_wr_free_link(lnk); 1308 smc_ib_destroy_queue_pair(lnk); 1309 smc_ib_dealloc_protection_domain(lnk); 1310 smcr_link_put(lnk); /* theoretically last link_put */ 1311 } 1312 1313 void smcr_link_hold(struct smc_link *lnk) 1314 { 1315 refcount_inc(&lnk->refcnt); 1316 } 1317 1318 void smcr_link_put(struct smc_link *lnk) 1319 { 1320 if (refcount_dec_and_test(&lnk->refcnt)) 1321 __smcr_link_clear(lnk); 1322 } 1323 1324 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 1325 struct smc_buf_desc *buf_desc) 1326 { 1327 int i; 1328 1329 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1330 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 1331 1332 if (!buf_desc->is_vm && buf_desc->pages) 1333 __free_pages(buf_desc->pages, buf_desc->order); 1334 else if (buf_desc->is_vm && buf_desc->cpu_addr) 1335 vfree(buf_desc->cpu_addr); 1336 kfree(buf_desc); 1337 } 1338 1339 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 1340 struct smc_buf_desc *buf_desc) 1341 { 1342 if (is_dmb) { 1343 /* restore original buf len */ 1344 buf_desc->len += sizeof(struct smcd_cdc_msg); 1345 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 1346 } else { 1347 kfree(buf_desc->cpu_addr); 1348 } 1349 kfree(buf_desc); 1350 } 1351 1352 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 1353 struct smc_buf_desc *buf_desc) 1354 { 1355 if (lgr->is_smcd) 1356 smcd_buf_free(lgr, is_rmb, buf_desc); 1357 else 1358 smcr_buf_free(lgr, is_rmb, buf_desc); 1359 } 1360 1361 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 1362 { 1363 struct smc_buf_desc *buf_desc, *bf_desc; 1364 struct list_head *buf_list; 1365 int i; 1366 1367 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1368 if (is_rmb) 1369 buf_list = &lgr->rmbs[i]; 1370 else 1371 buf_list = &lgr->sndbufs[i]; 1372 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 1373 list) { 1374 list_del(&buf_desc->list); 1375 smc_buf_free(lgr, is_rmb, buf_desc); 1376 } 1377 } 1378 } 1379 1380 static void smc_lgr_free_bufs(struct smc_link_group *lgr) 1381 { 1382 /* free send buffers */ 1383 __smc_lgr_free_bufs(lgr, false); 1384 /* free rmbs */ 1385 __smc_lgr_free_bufs(lgr, true); 1386 } 1387 1388 /* won't be freed until no one accesses to lgr anymore */ 1389 static void __smc_lgr_free(struct smc_link_group *lgr) 1390 { 1391 smc_lgr_free_bufs(lgr); 1392 if (lgr->is_smcd) { 1393 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 1394 wake_up(&lgr->smcd->lgrs_deleted); 1395 } else { 1396 smc_wr_free_lgr_mem(lgr); 1397 if (!atomic_dec_return(&lgr_cnt)) 1398 wake_up(&lgrs_deleted); 1399 } 1400 kfree(lgr); 1401 } 1402 1403 /* remove a link group */ 1404 static void smc_lgr_free(struct smc_link_group *lgr) 1405 { 1406 int i; 1407 1408 if (!lgr->is_smcd) { 1409 down_write(&lgr->llc_conf_mutex); 1410 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1411 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 1412 smcr_link_clear(&lgr->lnk[i], false); 1413 } 1414 up_write(&lgr->llc_conf_mutex); 1415 smc_llc_lgr_clear(lgr); 1416 } 1417 1418 destroy_workqueue(lgr->tx_wq); 1419 if (lgr->is_smcd) { 1420 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 1421 put_device(lgr->smcd->ops->get_dev(lgr->smcd)); 1422 } 1423 smc_lgr_put(lgr); /* theoretically last lgr_put */ 1424 } 1425 1426 void smc_lgr_hold(struct smc_link_group *lgr) 1427 { 1428 refcount_inc(&lgr->refcnt); 1429 } 1430 1431 void smc_lgr_put(struct smc_link_group *lgr) 1432 { 1433 if (refcount_dec_and_test(&lgr->refcnt)) 1434 __smc_lgr_free(lgr); 1435 } 1436 1437 static void smc_sk_wake_ups(struct smc_sock *smc) 1438 { 1439 smc->sk.sk_write_space(&smc->sk); 1440 smc->sk.sk_data_ready(&smc->sk); 1441 smc->sk.sk_state_change(&smc->sk); 1442 } 1443 1444 /* kill a connection */ 1445 static void smc_conn_kill(struct smc_connection *conn, bool soft) 1446 { 1447 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1448 1449 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 1450 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 1451 else 1452 smc_close_abort(conn); 1453 conn->killed = 1; 1454 smc->sk.sk_err = ECONNABORTED; 1455 smc_sk_wake_ups(smc); 1456 if (conn->lgr->is_smcd) { 1457 smc_ism_unset_conn(conn); 1458 if (smc_ism_support_dmb_nocopy(conn->lgr->smcd)) 1459 smcd_buf_detach(conn); 1460 if (soft) 1461 tasklet_kill(&conn->rx_tsklet); 1462 else 1463 tasklet_unlock_wait(&conn->rx_tsklet); 1464 } else { 1465 smc_cdc_wait_pend_tx_wr(conn); 1466 } 1467 smc_lgr_unregister_conn(conn); 1468 smc_close_active_abort(smc); 1469 } 1470 1471 static void smc_lgr_cleanup(struct smc_link_group *lgr) 1472 { 1473 if (lgr->is_smcd) { 1474 smc_ism_signal_shutdown(lgr); 1475 } else { 1476 u32 rsn = lgr->llc_termination_rsn; 1477 1478 if (!rsn) 1479 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 1480 smc_llc_send_link_delete_all(lgr, false, rsn); 1481 smcr_lgr_link_deactivate_all(lgr); 1482 } 1483 } 1484 1485 /* terminate link group 1486 * @soft: true if link group shutdown can take its time 1487 * false if immediate link group shutdown is required 1488 */ 1489 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 1490 { 1491 struct smc_connection *conn; 1492 struct smc_sock *smc; 1493 struct rb_node *node; 1494 1495 if (lgr->terminating) 1496 return; /* lgr already terminating */ 1497 /* cancel free_work sync, will terminate when lgr->freeing is set */ 1498 cancel_delayed_work(&lgr->free_work); 1499 lgr->terminating = 1; 1500 1501 /* kill remaining link group connections */ 1502 read_lock_bh(&lgr->conns_lock); 1503 node = rb_first(&lgr->conns_all); 1504 while (node) { 1505 read_unlock_bh(&lgr->conns_lock); 1506 conn = rb_entry(node, struct smc_connection, alert_node); 1507 smc = container_of(conn, struct smc_sock, conn); 1508 sock_hold(&smc->sk); /* sock_put below */ 1509 lock_sock(&smc->sk); 1510 smc_conn_kill(conn, soft); 1511 release_sock(&smc->sk); 1512 sock_put(&smc->sk); /* sock_hold above */ 1513 read_lock_bh(&lgr->conns_lock); 1514 node = rb_first(&lgr->conns_all); 1515 } 1516 read_unlock_bh(&lgr->conns_lock); 1517 smc_lgr_cleanup(lgr); 1518 smc_lgr_free(lgr); 1519 } 1520 1521 /* unlink link group and schedule termination */ 1522 void smc_lgr_terminate_sched(struct smc_link_group *lgr) 1523 { 1524 spinlock_t *lgr_lock; 1525 1526 smc_lgr_list_head(lgr, &lgr_lock); 1527 spin_lock_bh(lgr_lock); 1528 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 1529 spin_unlock_bh(lgr_lock); 1530 return; /* lgr already terminating */ 1531 } 1532 list_del_init(&lgr->list); 1533 lgr->freeing = 1; 1534 spin_unlock_bh(lgr_lock); 1535 schedule_work(&lgr->terminate_work); 1536 } 1537 1538 /* Called when peer lgr shutdown (regularly or abnormally) is received */ 1539 void smc_smcd_terminate(struct smcd_dev *dev, struct smcd_gid *peer_gid, 1540 unsigned short vlan) 1541 { 1542 struct smc_link_group *lgr, *l; 1543 LIST_HEAD(lgr_free_list); 1544 1545 /* run common cleanup function and build free list */ 1546 spin_lock_bh(&dev->lgr_lock); 1547 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 1548 if ((!peer_gid->gid || 1549 (lgr->peer_gid.gid == peer_gid->gid && 1550 !smc_ism_is_virtual(dev) ? 1 : 1551 lgr->peer_gid.gid_ext == peer_gid->gid_ext)) && 1552 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 1553 if (peer_gid->gid) /* peer triggered termination */ 1554 lgr->peer_shutdown = 1; 1555 list_move(&lgr->list, &lgr_free_list); 1556 lgr->freeing = 1; 1557 } 1558 } 1559 spin_unlock_bh(&dev->lgr_lock); 1560 1561 /* cancel the regular free workers and actually free lgrs */ 1562 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 1563 list_del_init(&lgr->list); 1564 schedule_work(&lgr->terminate_work); 1565 } 1566 } 1567 1568 /* Called when an SMCD device is removed or the smc module is unloaded */ 1569 void smc_smcd_terminate_all(struct smcd_dev *smcd) 1570 { 1571 struct smc_link_group *lgr, *lg; 1572 LIST_HEAD(lgr_free_list); 1573 1574 spin_lock_bh(&smcd->lgr_lock); 1575 list_splice_init(&smcd->lgr_list, &lgr_free_list); 1576 list_for_each_entry(lgr, &lgr_free_list, list) 1577 lgr->freeing = 1; 1578 spin_unlock_bh(&smcd->lgr_lock); 1579 1580 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1581 list_del_init(&lgr->list); 1582 __smc_lgr_terminate(lgr, false); 1583 } 1584 1585 if (atomic_read(&smcd->lgr_cnt)) 1586 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1587 } 1588 1589 /* Called when an SMCR device is removed or the smc module is unloaded. 1590 * If smcibdev is given, all SMCR link groups using this device are terminated. 1591 * If smcibdev is NULL, all SMCR link groups are terminated. 1592 */ 1593 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1594 { 1595 struct smc_link_group *lgr, *lg; 1596 LIST_HEAD(lgr_free_list); 1597 int i; 1598 1599 spin_lock_bh(&smc_lgr_list.lock); 1600 if (!smcibdev) { 1601 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1602 list_for_each_entry(lgr, &lgr_free_list, list) 1603 lgr->freeing = 1; 1604 } else { 1605 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1606 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1607 if (lgr->lnk[i].smcibdev == smcibdev) 1608 smcr_link_down_cond_sched(&lgr->lnk[i]); 1609 } 1610 } 1611 } 1612 spin_unlock_bh(&smc_lgr_list.lock); 1613 1614 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1615 list_del_init(&lgr->list); 1616 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1617 __smc_lgr_terminate(lgr, false); 1618 } 1619 1620 if (smcibdev) { 1621 if (atomic_read(&smcibdev->lnk_cnt)) 1622 wait_event(smcibdev->lnks_deleted, 1623 !atomic_read(&smcibdev->lnk_cnt)); 1624 } else { 1625 if (atomic_read(&lgr_cnt)) 1626 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1627 } 1628 } 1629 1630 /* set new lgr type and clear all asymmetric link tagging */ 1631 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1632 { 1633 char *lgr_type = ""; 1634 int i; 1635 1636 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1637 if (smc_link_usable(&lgr->lnk[i])) 1638 lgr->lnk[i].link_is_asym = false; 1639 if (lgr->type == new_type) 1640 return; 1641 lgr->type = new_type; 1642 1643 switch (lgr->type) { 1644 case SMC_LGR_NONE: 1645 lgr_type = "NONE"; 1646 break; 1647 case SMC_LGR_SINGLE: 1648 lgr_type = "SINGLE"; 1649 break; 1650 case SMC_LGR_SYMMETRIC: 1651 lgr_type = "SYMMETRIC"; 1652 break; 1653 case SMC_LGR_ASYMMETRIC_PEER: 1654 lgr_type = "ASYMMETRIC_PEER"; 1655 break; 1656 case SMC_LGR_ASYMMETRIC_LOCAL: 1657 lgr_type = "ASYMMETRIC_LOCAL"; 1658 break; 1659 } 1660 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: " 1661 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1662 lgr->net->net_cookie, lgr_type, lgr->pnet_id); 1663 } 1664 1665 /* set new lgr type and tag a link as asymmetric */ 1666 void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1667 enum smc_lgr_type new_type, int asym_lnk_idx) 1668 { 1669 smcr_lgr_set_type(lgr, new_type); 1670 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1671 } 1672 1673 /* abort connection, abort_work scheduled from tasklet context */ 1674 static void smc_conn_abort_work(struct work_struct *work) 1675 { 1676 struct smc_connection *conn = container_of(work, 1677 struct smc_connection, 1678 abort_work); 1679 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1680 1681 lock_sock(&smc->sk); 1682 smc_conn_kill(conn, true); 1683 release_sock(&smc->sk); 1684 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1685 } 1686 1687 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1688 { 1689 struct smc_link_group *lgr, *n; 1690 1691 spin_lock_bh(&smc_lgr_list.lock); 1692 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1693 struct smc_link *link; 1694 1695 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1696 SMC_MAX_PNETID_LEN) || 1697 lgr->type == SMC_LGR_SYMMETRIC || 1698 lgr->type == SMC_LGR_ASYMMETRIC_PEER || 1699 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net)) 1700 continue; 1701 1702 if (lgr->type == SMC_LGR_SINGLE && lgr->max_links <= 1) 1703 continue; 1704 1705 /* trigger local add link processing */ 1706 link = smc_llc_usable_link(lgr); 1707 if (link) 1708 smc_llc_add_link_local(link); 1709 } 1710 spin_unlock_bh(&smc_lgr_list.lock); 1711 } 1712 1713 /* link is down - switch connections to alternate link, 1714 * must be called under lgr->llc_conf_mutex lock 1715 */ 1716 static void smcr_link_down(struct smc_link *lnk) 1717 { 1718 struct smc_link_group *lgr = lnk->lgr; 1719 struct smc_link *to_lnk; 1720 int del_link_id; 1721 1722 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1723 return; 1724 1725 to_lnk = smc_switch_conns(lgr, lnk, true); 1726 if (!to_lnk) { /* no backup link available */ 1727 smcr_link_clear(lnk, true); 1728 return; 1729 } 1730 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1731 del_link_id = lnk->link_id; 1732 1733 if (lgr->role == SMC_SERV) { 1734 /* trigger local delete link processing */ 1735 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1736 } else { 1737 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1738 /* another llc task is ongoing */ 1739 up_write(&lgr->llc_conf_mutex); 1740 wait_event_timeout(lgr->llc_flow_waiter, 1741 (list_empty(&lgr->list) || 1742 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1743 SMC_LLC_WAIT_TIME); 1744 down_write(&lgr->llc_conf_mutex); 1745 } 1746 if (!list_empty(&lgr->list)) { 1747 smc_llc_send_delete_link(to_lnk, del_link_id, 1748 SMC_LLC_REQ, true, 1749 SMC_LLC_DEL_LOST_PATH); 1750 smcr_link_clear(lnk, true); 1751 } 1752 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1753 } 1754 } 1755 1756 /* must be called under lgr->llc_conf_mutex lock */ 1757 void smcr_link_down_cond(struct smc_link *lnk) 1758 { 1759 if (smc_link_downing(&lnk->state)) { 1760 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1761 smcr_link_down(lnk); 1762 } 1763 } 1764 1765 /* will get the lgr->llc_conf_mutex lock */ 1766 void smcr_link_down_cond_sched(struct smc_link *lnk) 1767 { 1768 if (smc_link_downing(&lnk->state)) { 1769 trace_smcr_link_down(lnk, __builtin_return_address(0)); 1770 schedule_work(&lnk->link_down_wrk); 1771 } 1772 } 1773 1774 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1775 { 1776 struct smc_link_group *lgr, *n; 1777 int i; 1778 1779 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1780 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1781 SMC_MAX_PNETID_LEN)) 1782 continue; /* lgr is not affected */ 1783 if (list_empty(&lgr->list)) 1784 continue; 1785 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1786 struct smc_link *lnk = &lgr->lnk[i]; 1787 1788 if (smc_link_usable(lnk) && 1789 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1790 smcr_link_down_cond_sched(lnk); 1791 } 1792 } 1793 } 1794 1795 static void smc_link_down_work(struct work_struct *work) 1796 { 1797 struct smc_link *link = container_of(work, struct smc_link, 1798 link_down_wrk); 1799 struct smc_link_group *lgr = link->lgr; 1800 1801 if (list_empty(&lgr->list)) 1802 return; 1803 wake_up_all(&lgr->llc_msg_waiter); 1804 down_write(&lgr->llc_conf_mutex); 1805 smcr_link_down(link); 1806 up_write(&lgr->llc_conf_mutex); 1807 } 1808 1809 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1810 struct netdev_nested_priv *priv) 1811 { 1812 unsigned short *vlan_id = (unsigned short *)priv->data; 1813 1814 if (is_vlan_dev(lower_dev)) { 1815 *vlan_id = vlan_dev_vlan_id(lower_dev); 1816 return 1; 1817 } 1818 1819 return 0; 1820 } 1821 1822 /* Determine vlan of internal TCP socket. */ 1823 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1824 { 1825 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1826 struct netdev_nested_priv priv; 1827 struct net_device *ndev; 1828 int rc = 0; 1829 1830 ini->vlan_id = 0; 1831 if (!dst) { 1832 rc = -ENOTCONN; 1833 goto out; 1834 } 1835 if (!dst->dev) { 1836 rc = -ENODEV; 1837 goto out_rel; 1838 } 1839 1840 ndev = dst->dev; 1841 if (is_vlan_dev(ndev)) { 1842 ini->vlan_id = vlan_dev_vlan_id(ndev); 1843 goto out_rel; 1844 } 1845 1846 priv.data = (void *)&ini->vlan_id; 1847 rtnl_lock(); 1848 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1849 rtnl_unlock(); 1850 1851 out_rel: 1852 dst_release(dst); 1853 out: 1854 return rc; 1855 } 1856 1857 static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version, 1858 u8 peer_systemid[], 1859 u8 peer_gid[], 1860 u8 peer_mac_v1[], 1861 enum smc_lgr_role role, u32 clcqpn, 1862 struct net *net) 1863 { 1864 struct smc_link *lnk; 1865 int i; 1866 1867 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) || 1868 lgr->role != role) 1869 return false; 1870 1871 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1872 lnk = &lgr->lnk[i]; 1873 1874 if (!smc_link_active(lnk)) 1875 continue; 1876 /* use verbs API to check netns, instead of lgr->net */ 1877 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net)) 1878 return false; 1879 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) && 1880 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) && 1881 (smcr_version == SMC_V2 || 1882 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN))) 1883 return true; 1884 } 1885 return false; 1886 } 1887 1888 static bool smcd_lgr_match(struct smc_link_group *lgr, 1889 struct smcd_dev *smcismdev, 1890 struct smcd_gid *peer_gid) 1891 { 1892 return lgr->peer_gid.gid == peer_gid->gid && lgr->smcd == smcismdev && 1893 smc_ism_is_virtual(smcismdev) ? 1894 (lgr->peer_gid.gid_ext == peer_gid->gid_ext) : 1; 1895 } 1896 1897 /* create a new SMC connection (and a new link group if necessary) */ 1898 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1899 { 1900 struct smc_connection *conn = &smc->conn; 1901 struct net *net = sock_net(&smc->sk); 1902 struct list_head *lgr_list; 1903 struct smc_link_group *lgr; 1904 enum smc_lgr_role role; 1905 spinlock_t *lgr_lock; 1906 int rc = 0; 1907 1908 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1909 &smc_lgr_list.list; 1910 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1911 &smc_lgr_list.lock; 1912 ini->first_contact_local = 1; 1913 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1914 if (role == SMC_CLNT && ini->first_contact_peer) 1915 /* create new link group as well */ 1916 goto create; 1917 1918 /* determine if an existing link group can be reused */ 1919 spin_lock_bh(lgr_lock); 1920 list_for_each_entry(lgr, lgr_list, list) { 1921 write_lock_bh(&lgr->conns_lock); 1922 if ((ini->is_smcd ? 1923 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1924 &ini->ism_peer_gid[ini->ism_selected]) : 1925 smcr_lgr_match(lgr, ini->smcr_version, 1926 ini->peer_systemid, 1927 ini->peer_gid, ini->peer_mac, role, 1928 ini->ib_clcqpn, net)) && 1929 !lgr->sync_err && 1930 (ini->smcd_version == SMC_V2 || 1931 lgr->vlan_id == ini->vlan_id) && 1932 (role == SMC_CLNT || ini->is_smcd || 1933 (lgr->conns_num < lgr->max_conns && 1934 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1935 /* link group found */ 1936 ini->first_contact_local = 0; 1937 conn->lgr = lgr; 1938 rc = smc_lgr_register_conn(conn, false); 1939 write_unlock_bh(&lgr->conns_lock); 1940 if (!rc && delayed_work_pending(&lgr->free_work)) 1941 cancel_delayed_work(&lgr->free_work); 1942 break; 1943 } 1944 write_unlock_bh(&lgr->conns_lock); 1945 } 1946 spin_unlock_bh(lgr_lock); 1947 if (rc) 1948 return rc; 1949 1950 if (role == SMC_CLNT && !ini->first_contact_peer && 1951 ini->first_contact_local) { 1952 /* Server reuses a link group, but Client wants to start 1953 * a new one 1954 * send out_of_sync decline, reason synchr. error 1955 */ 1956 return SMC_CLC_DECL_SYNCERR; 1957 } 1958 1959 create: 1960 if (ini->first_contact_local) { 1961 rc = smc_lgr_create(smc, ini); 1962 if (rc) 1963 goto out; 1964 lgr = conn->lgr; 1965 write_lock_bh(&lgr->conns_lock); 1966 rc = smc_lgr_register_conn(conn, true); 1967 write_unlock_bh(&lgr->conns_lock); 1968 if (rc) { 1969 smc_lgr_cleanup_early(lgr); 1970 goto out; 1971 } 1972 } 1973 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */ 1974 if (!conn->lgr->is_smcd) 1975 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */ 1976 conn->freed = 0; 1977 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 1978 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 1979 conn->urg_state = SMC_URG_READ; 1980 init_waitqueue_head(&conn->cdc_pend_tx_wq); 1981 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 1982 if (ini->is_smcd) { 1983 conn->rx_off = sizeof(struct smcd_cdc_msg); 1984 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 1985 } else { 1986 conn->rx_off = 0; 1987 } 1988 #ifndef KERNEL_HAS_ATOMIC64 1989 spin_lock_init(&conn->acurs_lock); 1990 #endif 1991 1992 out: 1993 return rc; 1994 } 1995 1996 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 1997 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */ 1998 1999 /* convert the RMB size into the compressed notation (minimum 16K, see 2000 * SMCD/R_DMBE_SIZES. 2001 * In contrast to plain ilog2, this rounds towards the next power of 2, 2002 * so the socket application gets at least its desired sndbuf / rcvbuf size. 2003 */ 2004 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb) 2005 { 2006 u8 compressed; 2007 2008 if (size <= SMC_BUF_MIN_SIZE) 2009 return 0; 2010 2011 size = (size - 1) >> 14; /* convert to 16K multiple */ 2012 compressed = min_t(u8, ilog2(size) + 1, 2013 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES); 2014 2015 #ifdef CONFIG_ARCH_NO_SG_CHAIN 2016 if (!is_smcd && is_rmb) 2017 /* RMBs are backed by & limited to max size of scatterlists */ 2018 compressed = min_t(u8, compressed, ilog2((SG_MAX_SINGLE_ALLOC * PAGE_SIZE) >> 14)); 2019 #endif 2020 2021 return compressed; 2022 } 2023 2024 /* convert the RMB size from compressed notation into integer */ 2025 int smc_uncompress_bufsize(u8 compressed) 2026 { 2027 u32 size; 2028 2029 size = 0x00000001 << (((int)compressed) + 14); 2030 return (int)size; 2031 } 2032 2033 /* try to reuse a sndbuf or rmb description slot for a certain 2034 * buffer size; if not available, return NULL 2035 */ 2036 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 2037 struct rw_semaphore *lock, 2038 struct list_head *buf_list) 2039 { 2040 struct smc_buf_desc *buf_slot; 2041 2042 down_read(lock); 2043 list_for_each_entry(buf_slot, buf_list, list) { 2044 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 2045 up_read(lock); 2046 return buf_slot; 2047 } 2048 } 2049 up_read(lock); 2050 return NULL; 2051 } 2052 2053 /* one of the conditions for announcing a receiver's current window size is 2054 * that it "results in a minimum increase in the window size of 10% of the 2055 * receive buffer space" [RFC7609] 2056 */ 2057 static inline int smc_rmb_wnd_update_limit(int rmbe_size) 2058 { 2059 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 2060 } 2061 2062 /* map an buf to a link */ 2063 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 2064 struct smc_link *lnk) 2065 { 2066 int rc, i, nents, offset, buf_size, size, access_flags; 2067 struct scatterlist *sg; 2068 void *buf; 2069 2070 if (buf_desc->is_map_ib[lnk->link_idx]) 2071 return 0; 2072 2073 if (buf_desc->is_vm) { 2074 buf = buf_desc->cpu_addr; 2075 buf_size = buf_desc->len; 2076 offset = offset_in_page(buf_desc->cpu_addr); 2077 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE; 2078 } else { 2079 nents = 1; 2080 } 2081 2082 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL); 2083 if (rc) 2084 return rc; 2085 2086 if (buf_desc->is_vm) { 2087 /* virtually contiguous buffer */ 2088 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) { 2089 size = min_t(int, PAGE_SIZE - offset, buf_size); 2090 sg_set_page(sg, vmalloc_to_page(buf), size, offset); 2091 buf += size / sizeof(*buf); 2092 buf_size -= size; 2093 offset = 0; 2094 } 2095 } else { 2096 /* physically contiguous buffer */ 2097 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 2098 buf_desc->cpu_addr, buf_desc->len); 2099 } 2100 2101 /* map sg table to DMA address */ 2102 rc = smc_ib_buf_map_sg(lnk, buf_desc, 2103 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2104 /* SMC protocol depends on mapping to one DMA address only */ 2105 if (rc != nents) { 2106 rc = -EAGAIN; 2107 goto free_table; 2108 } 2109 2110 buf_desc->is_dma_need_sync |= 2111 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx; 2112 2113 if (is_rmb || buf_desc->is_vm) { 2114 /* create a new memory region for the RMB or vzalloced sndbuf */ 2115 access_flags = is_rmb ? 2116 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE : 2117 IB_ACCESS_LOCAL_WRITE; 2118 2119 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags, 2120 buf_desc, lnk->link_idx); 2121 if (rc) 2122 goto buf_unmap; 2123 smc_ib_sync_sg_for_device(lnk, buf_desc, 2124 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2125 } 2126 buf_desc->is_map_ib[lnk->link_idx] = true; 2127 return 0; 2128 2129 buf_unmap: 2130 smc_ib_buf_unmap_sg(lnk, buf_desc, 2131 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 2132 free_table: 2133 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 2134 return rc; 2135 } 2136 2137 /* register a new buf on IB device, rmb or vzalloced sndbuf 2138 * must be called under lgr->llc_conf_mutex lock 2139 */ 2140 int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc) 2141 { 2142 if (list_empty(&link->lgr->list)) 2143 return -ENOLINK; 2144 if (!buf_desc->is_reg_mr[link->link_idx]) { 2145 /* register memory region for new buf */ 2146 if (buf_desc->is_vm) 2147 buf_desc->mr[link->link_idx]->iova = 2148 (uintptr_t)buf_desc->cpu_addr; 2149 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) { 2150 buf_desc->is_reg_err = true; 2151 return -EFAULT; 2152 } 2153 buf_desc->is_reg_mr[link->link_idx] = true; 2154 } 2155 return 0; 2156 } 2157 2158 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct rw_semaphore *lock, 2159 struct list_head *lst, bool is_rmb) 2160 { 2161 struct smc_buf_desc *buf_desc, *bf; 2162 int rc = 0; 2163 2164 down_write(lock); 2165 list_for_each_entry_safe(buf_desc, bf, lst, list) { 2166 if (!buf_desc->used) 2167 continue; 2168 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 2169 if (rc) 2170 goto out; 2171 } 2172 out: 2173 up_write(lock); 2174 return rc; 2175 } 2176 2177 /* map all used buffers of lgr for a new link */ 2178 int smcr_buf_map_lgr(struct smc_link *lnk) 2179 { 2180 struct smc_link_group *lgr = lnk->lgr; 2181 int i, rc = 0; 2182 2183 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2184 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 2185 &lgr->rmbs[i], true); 2186 if (rc) 2187 return rc; 2188 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 2189 &lgr->sndbufs[i], false); 2190 if (rc) 2191 return rc; 2192 } 2193 return 0; 2194 } 2195 2196 /* register all used buffers of lgr for a new link, 2197 * must be called under lgr->llc_conf_mutex lock 2198 */ 2199 int smcr_buf_reg_lgr(struct smc_link *lnk) 2200 { 2201 struct smc_link_group *lgr = lnk->lgr; 2202 struct smc_buf_desc *buf_desc, *bf; 2203 int i, rc = 0; 2204 2205 /* reg all RMBs for a new link */ 2206 down_write(&lgr->rmbs_lock); 2207 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2208 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 2209 if (!buf_desc->used) 2210 continue; 2211 rc = smcr_link_reg_buf(lnk, buf_desc); 2212 if (rc) { 2213 up_write(&lgr->rmbs_lock); 2214 return rc; 2215 } 2216 } 2217 } 2218 up_write(&lgr->rmbs_lock); 2219 2220 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2221 return rc; 2222 2223 /* reg all vzalloced sndbufs for a new link */ 2224 down_write(&lgr->sndbufs_lock); 2225 for (i = 0; i < SMC_RMBE_SIZES; i++) { 2226 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) { 2227 if (!buf_desc->used || !buf_desc->is_vm) 2228 continue; 2229 rc = smcr_link_reg_buf(lnk, buf_desc); 2230 if (rc) { 2231 up_write(&lgr->sndbufs_lock); 2232 return rc; 2233 } 2234 } 2235 } 2236 up_write(&lgr->sndbufs_lock); 2237 return rc; 2238 } 2239 2240 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 2241 bool is_rmb, int bufsize) 2242 { 2243 struct smc_buf_desc *buf_desc; 2244 2245 /* try to alloc a new buffer */ 2246 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2247 if (!buf_desc) 2248 return ERR_PTR(-ENOMEM); 2249 2250 switch (lgr->buf_type) { 2251 case SMCR_PHYS_CONT_BUFS: 2252 case SMCR_MIXED_BUFS: 2253 buf_desc->order = get_order(bufsize); 2254 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 2255 __GFP_NOMEMALLOC | __GFP_COMP | 2256 __GFP_NORETRY | __GFP_ZERO, 2257 buf_desc->order); 2258 if (buf_desc->pages) { 2259 buf_desc->cpu_addr = 2260 (void *)page_address(buf_desc->pages); 2261 buf_desc->len = bufsize; 2262 buf_desc->is_vm = false; 2263 break; 2264 } 2265 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS) 2266 goto out; 2267 fallthrough; // try virtually continguous buf 2268 case SMCR_VIRT_CONT_BUFS: 2269 buf_desc->order = get_order(bufsize); 2270 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order); 2271 if (!buf_desc->cpu_addr) 2272 goto out; 2273 buf_desc->pages = NULL; 2274 buf_desc->len = bufsize; 2275 buf_desc->is_vm = true; 2276 break; 2277 } 2278 return buf_desc; 2279 2280 out: 2281 kfree(buf_desc); 2282 return ERR_PTR(-EAGAIN); 2283 } 2284 2285 /* map buf_desc on all usable links, 2286 * unused buffers stay mapped as long as the link is up 2287 */ 2288 static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 2289 struct smc_buf_desc *buf_desc, bool is_rmb) 2290 { 2291 int i, rc = 0, cnt = 0; 2292 2293 /* protect against parallel link reconfiguration */ 2294 down_read(&lgr->llc_conf_mutex); 2295 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2296 struct smc_link *lnk = &lgr->lnk[i]; 2297 2298 if (!smc_link_usable(lnk)) 2299 continue; 2300 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 2301 rc = -ENOMEM; 2302 goto out; 2303 } 2304 cnt++; 2305 } 2306 out: 2307 up_read(&lgr->llc_conf_mutex); 2308 if (!rc && !cnt) 2309 rc = -EINVAL; 2310 return rc; 2311 } 2312 2313 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 2314 bool is_dmb, int bufsize) 2315 { 2316 struct smc_buf_desc *buf_desc; 2317 int rc; 2318 2319 /* try to alloc a new DMB */ 2320 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2321 if (!buf_desc) 2322 return ERR_PTR(-ENOMEM); 2323 if (is_dmb) { 2324 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 2325 if (rc) { 2326 kfree(buf_desc); 2327 if (rc == -ENOMEM) 2328 return ERR_PTR(-EAGAIN); 2329 if (rc == -ENOSPC) 2330 return ERR_PTR(-ENOSPC); 2331 return ERR_PTR(-EIO); 2332 } 2333 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 2334 /* CDC header stored in buf. So, pretend it was smaller */ 2335 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 2336 } else { 2337 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 2338 __GFP_NOWARN | __GFP_NORETRY | 2339 __GFP_NOMEMALLOC); 2340 if (!buf_desc->cpu_addr) { 2341 kfree(buf_desc); 2342 return ERR_PTR(-EAGAIN); 2343 } 2344 buf_desc->len = bufsize; 2345 } 2346 return buf_desc; 2347 } 2348 2349 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 2350 { 2351 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 2352 struct smc_connection *conn = &smc->conn; 2353 struct smc_link_group *lgr = conn->lgr; 2354 struct list_head *buf_list; 2355 int bufsize, bufsize_comp; 2356 struct rw_semaphore *lock; /* lock buffer list */ 2357 bool is_dgraded = false; 2358 2359 if (is_rmb) 2360 /* use socket recv buffer size (w/o overhead) as start value */ 2361 bufsize = smc->sk.sk_rcvbuf / 2; 2362 else 2363 /* use socket send buffer size (w/o overhead) as start value */ 2364 bufsize = smc->sk.sk_sndbuf / 2; 2365 2366 for (bufsize_comp = smc_compress_bufsize(bufsize, is_smcd, is_rmb); 2367 bufsize_comp >= 0; bufsize_comp--) { 2368 if (is_rmb) { 2369 lock = &lgr->rmbs_lock; 2370 buf_list = &lgr->rmbs[bufsize_comp]; 2371 } else { 2372 lock = &lgr->sndbufs_lock; 2373 buf_list = &lgr->sndbufs[bufsize_comp]; 2374 } 2375 bufsize = smc_uncompress_bufsize(bufsize_comp); 2376 2377 /* check for reusable slot in the link group */ 2378 buf_desc = smc_buf_get_slot(bufsize_comp, lock, buf_list); 2379 if (buf_desc) { 2380 buf_desc->is_dma_need_sync = 0; 2381 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2382 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb); 2383 break; /* found reusable slot */ 2384 } 2385 2386 if (is_smcd) 2387 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 2388 else 2389 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); 2390 2391 if (PTR_ERR(buf_desc) == -ENOMEM) 2392 break; 2393 if (IS_ERR(buf_desc)) { 2394 if (!is_dgraded) { 2395 is_dgraded = true; 2396 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb); 2397 } 2398 continue; 2399 } 2400 2401 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb); 2402 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize); 2403 buf_desc->used = 1; 2404 down_write(lock); 2405 list_add(&buf_desc->list, buf_list); 2406 up_write(lock); 2407 break; /* found */ 2408 } 2409 2410 if (IS_ERR(buf_desc)) 2411 return PTR_ERR(buf_desc); 2412 2413 if (!is_smcd) { 2414 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 2415 smcr_buf_unuse(buf_desc, is_rmb, lgr); 2416 return -ENOMEM; 2417 } 2418 } 2419 2420 if (is_rmb) { 2421 conn->rmb_desc = buf_desc; 2422 conn->rmbe_size_comp = bufsize_comp; 2423 smc->sk.sk_rcvbuf = bufsize * 2; 2424 atomic_set(&conn->bytes_to_rcv, 0); 2425 conn->rmbe_update_limit = 2426 smc_rmb_wnd_update_limit(buf_desc->len); 2427 if (is_smcd) 2428 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 2429 } else { 2430 conn->sndbuf_desc = buf_desc; 2431 smc->sk.sk_sndbuf = bufsize * 2; 2432 atomic_set(&conn->sndbuf_space, bufsize); 2433 } 2434 return 0; 2435 } 2436 2437 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 2438 { 2439 if (!conn->sndbuf_desc->is_dma_need_sync) 2440 return; 2441 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd || 2442 !smc_link_active(conn->lnk)) 2443 return; 2444 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 2445 } 2446 2447 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 2448 { 2449 int i; 2450 2451 if (!conn->rmb_desc->is_dma_need_sync) 2452 return; 2453 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd) 2454 return; 2455 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 2456 if (!smc_link_active(&conn->lgr->lnk[i])) 2457 continue; 2458 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 2459 DMA_FROM_DEVICE); 2460 } 2461 } 2462 2463 /* create the send and receive buffer for an SMC socket; 2464 * receive buffers are called RMBs; 2465 * (even though the SMC protocol allows more than one RMB-element per RMB, 2466 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 2467 * extra RMB for every connection in a link group 2468 */ 2469 int smc_buf_create(struct smc_sock *smc, bool is_smcd) 2470 { 2471 int rc; 2472 2473 /* create send buffer */ 2474 if (is_smcd && 2475 smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd)) 2476 goto create_rmb; 2477 2478 rc = __smc_buf_create(smc, is_smcd, false); 2479 if (rc) 2480 return rc; 2481 2482 create_rmb: 2483 /* create rmb */ 2484 rc = __smc_buf_create(smc, is_smcd, true); 2485 if (rc && smc->conn.sndbuf_desc) { 2486 down_write(&smc->conn.lgr->sndbufs_lock); 2487 list_del(&smc->conn.sndbuf_desc->list); 2488 up_write(&smc->conn.lgr->sndbufs_lock); 2489 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 2490 smc->conn.sndbuf_desc = NULL; 2491 } 2492 return rc; 2493 } 2494 2495 int smcd_buf_attach(struct smc_sock *smc) 2496 { 2497 struct smc_connection *conn = &smc->conn; 2498 struct smcd_dev *smcd = conn->lgr->smcd; 2499 u64 peer_token = conn->peer_token; 2500 struct smc_buf_desc *buf_desc; 2501 int rc; 2502 2503 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 2504 if (!buf_desc) 2505 return -ENOMEM; 2506 2507 /* The ghost sndbuf_desc describes the same memory region as 2508 * peer RMB. Its lifecycle is consistent with the connection's 2509 * and it will be freed with the connections instead of the 2510 * link group. 2511 */ 2512 rc = smc_ism_attach_dmb(smcd, peer_token, buf_desc); 2513 if (rc) 2514 goto free; 2515 2516 smc->sk.sk_sndbuf = buf_desc->len; 2517 buf_desc->cpu_addr = 2518 (u8 *)buf_desc->cpu_addr + sizeof(struct smcd_cdc_msg); 2519 buf_desc->len -= sizeof(struct smcd_cdc_msg); 2520 conn->sndbuf_desc = buf_desc; 2521 conn->sndbuf_desc->used = 1; 2522 atomic_set(&conn->sndbuf_space, conn->sndbuf_desc->len); 2523 return 0; 2524 2525 free: 2526 kfree(buf_desc); 2527 return rc; 2528 } 2529 2530 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 2531 { 2532 int i; 2533 2534 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 2535 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 2536 return i; 2537 } 2538 return -ENOSPC; 2539 } 2540 2541 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 2542 u32 rkey) 2543 { 2544 int i; 2545 2546 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2547 if (test_bit(i, lgr->rtokens_used_mask) && 2548 lgr->rtokens[i][lnk_idx].rkey == rkey) 2549 return i; 2550 } 2551 return -ENOENT; 2552 } 2553 2554 /* set rtoken for a new link to an existing rmb */ 2555 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 2556 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 2557 { 2558 int rtok_idx; 2559 2560 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 2561 if (rtok_idx == -ENOENT) 2562 return; 2563 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 2564 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 2565 } 2566 2567 /* set rtoken for a new link whose link_id is given */ 2568 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 2569 __be64 nw_vaddr, __be32 nw_rkey) 2570 { 2571 u64 dma_addr = be64_to_cpu(nw_vaddr); 2572 u32 rkey = ntohl(nw_rkey); 2573 bool found = false; 2574 int link_idx; 2575 2576 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 2577 if (lgr->lnk[link_idx].link_id == link_id) { 2578 found = true; 2579 break; 2580 } 2581 } 2582 if (!found) 2583 return; 2584 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 2585 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 2586 } 2587 2588 /* add a new rtoken from peer */ 2589 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 2590 { 2591 struct smc_link_group *lgr = smc_get_lgr(lnk); 2592 u64 dma_addr = be64_to_cpu(nw_vaddr); 2593 u32 rkey = ntohl(nw_rkey); 2594 int i; 2595 2596 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2597 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2598 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 2599 test_bit(i, lgr->rtokens_used_mask)) { 2600 /* already in list */ 2601 return i; 2602 } 2603 } 2604 i = smc_rmb_reserve_rtoken_idx(lgr); 2605 if (i < 0) 2606 return i; 2607 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 2608 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 2609 return i; 2610 } 2611 2612 /* delete an rtoken from all links */ 2613 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 2614 { 2615 struct smc_link_group *lgr = smc_get_lgr(lnk); 2616 u32 rkey = ntohl(nw_rkey); 2617 int i, j; 2618 2619 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 2620 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 2621 test_bit(i, lgr->rtokens_used_mask)) { 2622 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 2623 lgr->rtokens[i][j].rkey = 0; 2624 lgr->rtokens[i][j].dma_addr = 0; 2625 } 2626 clear_bit(i, lgr->rtokens_used_mask); 2627 return 0; 2628 } 2629 } 2630 return -ENOENT; 2631 } 2632 2633 /* save rkey and dma_addr received from peer during clc handshake */ 2634 int smc_rmb_rtoken_handling(struct smc_connection *conn, 2635 struct smc_link *lnk, 2636 struct smc_clc_msg_accept_confirm *clc) 2637 { 2638 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 2639 clc->r0.rmb_rkey); 2640 if (conn->rtoken_idx < 0) 2641 return conn->rtoken_idx; 2642 return 0; 2643 } 2644 2645 static void smc_core_going_away(void) 2646 { 2647 struct smc_ib_device *smcibdev; 2648 struct smcd_dev *smcd; 2649 2650 mutex_lock(&smc_ib_devices.mutex); 2651 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 2652 int i; 2653 2654 for (i = 0; i < SMC_MAX_PORTS; i++) 2655 set_bit(i, smcibdev->ports_going_away); 2656 } 2657 mutex_unlock(&smc_ib_devices.mutex); 2658 2659 mutex_lock(&smcd_dev_list.mutex); 2660 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 2661 smcd->going_away = 1; 2662 } 2663 mutex_unlock(&smcd_dev_list.mutex); 2664 } 2665 2666 /* Clean up all SMC link groups */ 2667 static void smc_lgrs_shutdown(void) 2668 { 2669 struct smcd_dev *smcd; 2670 2671 smc_core_going_away(); 2672 2673 smc_smcr_terminate_all(NULL); 2674 2675 mutex_lock(&smcd_dev_list.mutex); 2676 list_for_each_entry(smcd, &smcd_dev_list.list, list) 2677 smc_smcd_terminate_all(smcd); 2678 mutex_unlock(&smcd_dev_list.mutex); 2679 } 2680 2681 static int smc_core_reboot_event(struct notifier_block *this, 2682 unsigned long event, void *ptr) 2683 { 2684 smc_lgrs_shutdown(); 2685 smc_ib_unregister_client(); 2686 smc_ism_exit(); 2687 return 0; 2688 } 2689 2690 static struct notifier_block smc_reboot_notifier = { 2691 .notifier_call = smc_core_reboot_event, 2692 }; 2693 2694 int __init smc_core_init(void) 2695 { 2696 return register_reboot_notifier(&smc_reboot_notifier); 2697 } 2698 2699 /* Called (from smc_exit) when module is removed */ 2700 void smc_core_exit(void) 2701 { 2702 unregister_reboot_notifier(&smc_reboot_notifier); 2703 smc_lgrs_shutdown(); 2704 } 2705