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 <net/tcp.h> 20#include <net/sock.h> 21#include <rdma/ib_verbs.h> 22#include <rdma/ib_cache.h> 23 24#include "smc.h" 25#include "smc_clc.h" 26#include "smc_core.h" 27#include "smc_ib.h" 28#include "smc_wr.h" 29#include "smc_llc.h" 30#include "smc_cdc.h" 31#include "smc_close.h" 32#include "smc_ism.h" 33 34#define SMC_LGR_NUM_INCR 256 35#define SMC_LGR_FREE_DELAY_SERV (600 * HZ) 36#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ) 37 38static struct smc_lgr_list smc_lgr_list = { /* established link groups */ 39 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), 40 .list = LIST_HEAD_INIT(smc_lgr_list.list), 41 .num = 0, 42}; 43 44static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */ 45static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted); 46 47static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 48 struct smc_buf_desc *buf_desc); 49static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft); 50 51static void smc_link_down_work(struct work_struct *work); 52 53/* return head of link group list and its lock for a given link group */ 54static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr, 55 spinlock_t **lgr_lock) 56{ 57 if (lgr->is_smcd) { 58 *lgr_lock = &lgr->smcd->lgr_lock; 59 return &lgr->smcd->lgr_list; 60 } 61 62 *lgr_lock = &smc_lgr_list.lock; 63 return &smc_lgr_list.list; 64} 65 66static void smc_lgr_schedule_free_work(struct smc_link_group *lgr) 67{ 68 /* client link group creation always follows the server link group 69 * creation. For client use a somewhat higher removal delay time, 70 * otherwise there is a risk of out-of-sync link groups. 71 */ 72 if (!lgr->freeing) { 73 mod_delayed_work(system_wq, &lgr->free_work, 74 (!lgr->is_smcd && lgr->role == SMC_CLNT) ? 75 SMC_LGR_FREE_DELAY_CLNT : 76 SMC_LGR_FREE_DELAY_SERV); 77 } 78} 79 80/* Register connection's alert token in our lookup structure. 81 * To use rbtrees we have to implement our own insert core. 82 * Requires @conns_lock 83 * @smc connection to register 84 * Returns 0 on success, != otherwise. 85 */ 86static void smc_lgr_add_alert_token(struct smc_connection *conn) 87{ 88 struct rb_node **link, *parent = NULL; 89 u32 token = conn->alert_token_local; 90 91 link = &conn->lgr->conns_all.rb_node; 92 while (*link) { 93 struct smc_connection *cur = rb_entry(*link, 94 struct smc_connection, alert_node); 95 96 parent = *link; 97 if (cur->alert_token_local > token) 98 link = &parent->rb_left; 99 else 100 link = &parent->rb_right; 101 } 102 /* Put the new node there */ 103 rb_link_node(&conn->alert_node, parent, link); 104 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); 105} 106 107/* assign an SMC-R link to the connection */ 108static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first) 109{ 110 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING : 111 SMC_LNK_ACTIVE; 112 int i, j; 113 114 /* do link balancing */ 115 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 116 struct smc_link *lnk = &conn->lgr->lnk[i]; 117 118 if (lnk->state != expected || lnk->link_is_asym) 119 continue; 120 if (conn->lgr->role == SMC_CLNT) { 121 conn->lnk = lnk; /* temporary, SMC server assigns link*/ 122 break; 123 } 124 if (conn->lgr->conns_num % 2) { 125 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) { 126 struct smc_link *lnk2; 127 128 lnk2 = &conn->lgr->lnk[j]; 129 if (lnk2->state == expected && 130 !lnk2->link_is_asym) { 131 conn->lnk = lnk2; 132 break; 133 } 134 } 135 } 136 if (!conn->lnk) 137 conn->lnk = lnk; 138 break; 139 } 140 if (!conn->lnk) 141 return SMC_CLC_DECL_NOACTLINK; 142 return 0; 143} 144 145/* Register connection in link group by assigning an alert token 146 * registered in a search tree. 147 * Requires @conns_lock 148 * Note that '0' is a reserved value and not assigned. 149 */ 150static int smc_lgr_register_conn(struct smc_connection *conn, bool first) 151{ 152 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 153 static atomic_t nexttoken = ATOMIC_INIT(0); 154 int rc; 155 156 if (!conn->lgr->is_smcd) { 157 rc = smcr_lgr_conn_assign_link(conn, first); 158 if (rc) 159 return rc; 160 } 161 /* find a new alert_token_local value not yet used by some connection 162 * in this link group 163 */ 164 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ 165 while (!conn->alert_token_local) { 166 conn->alert_token_local = atomic_inc_return(&nexttoken); 167 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) 168 conn->alert_token_local = 0; 169 } 170 smc_lgr_add_alert_token(conn); 171 conn->lgr->conns_num++; 172 return 0; 173} 174 175/* Unregister connection and reset the alert token of the given connection< 176 */ 177static void __smc_lgr_unregister_conn(struct smc_connection *conn) 178{ 179 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 180 struct smc_link_group *lgr = conn->lgr; 181 182 rb_erase(&conn->alert_node, &lgr->conns_all); 183 lgr->conns_num--; 184 conn->alert_token_local = 0; 185 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ 186} 187 188/* Unregister connection from lgr 189 */ 190static void smc_lgr_unregister_conn(struct smc_connection *conn) 191{ 192 struct smc_link_group *lgr = conn->lgr; 193 194 if (!lgr) 195 return; 196 write_lock_bh(&lgr->conns_lock); 197 if (conn->alert_token_local) { 198 __smc_lgr_unregister_conn(conn); 199 } 200 write_unlock_bh(&lgr->conns_lock); 201 conn->lgr = NULL; 202} 203 204void smc_lgr_cleanup_early(struct smc_connection *conn) 205{ 206 struct smc_link_group *lgr = conn->lgr; 207 spinlock_t *lgr_lock; 208 209 if (!lgr) 210 return; 211 212 smc_conn_free(conn); 213 smc_lgr_list_head(lgr, &lgr_lock); 214 spin_lock_bh(lgr_lock); 215 /* do not use this link group for new connections */ 216 if (!list_empty(&lgr->list)) 217 list_del_init(&lgr->list); 218 spin_unlock_bh(lgr_lock); 219 __smc_lgr_terminate(lgr, true); 220} 221 222static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr) 223{ 224 int i; 225 226 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 227 struct smc_link *lnk = &lgr->lnk[i]; 228 229 if (smc_link_sendable(lnk)) 230 lnk->state = SMC_LNK_INACTIVE; 231 } 232 wake_up_all(&lgr->llc_msg_waiter); 233 wake_up_all(&lgr->llc_flow_waiter); 234} 235 236static void smc_lgr_free(struct smc_link_group *lgr); 237 238static void smc_lgr_free_work(struct work_struct *work) 239{ 240 struct smc_link_group *lgr = container_of(to_delayed_work(work), 241 struct smc_link_group, 242 free_work); 243 spinlock_t *lgr_lock; 244 bool conns; 245 246 smc_lgr_list_head(lgr, &lgr_lock); 247 spin_lock_bh(lgr_lock); 248 if (lgr->freeing) { 249 spin_unlock_bh(lgr_lock); 250 return; 251 } 252 read_lock_bh(&lgr->conns_lock); 253 conns = RB_EMPTY_ROOT(&lgr->conns_all); 254 read_unlock_bh(&lgr->conns_lock); 255 if (!conns) { /* number of lgr connections is no longer zero */ 256 spin_unlock_bh(lgr_lock); 257 return; 258 } 259 list_del_init(&lgr->list); /* remove from smc_lgr_list */ 260 lgr->freeing = 1; /* this instance does the freeing, no new schedule */ 261 spin_unlock_bh(lgr_lock); 262 cancel_delayed_work(&lgr->free_work); 263 264 if (!lgr->is_smcd && !lgr->terminating) 265 smc_llc_send_link_delete_all(lgr, true, 266 SMC_LLC_DEL_PROG_INIT_TERM); 267 if (lgr->is_smcd && !lgr->terminating) 268 smc_ism_signal_shutdown(lgr); 269 if (!lgr->is_smcd) 270 smcr_lgr_link_deactivate_all(lgr); 271 smc_lgr_free(lgr); 272} 273 274static void smc_lgr_terminate_work(struct work_struct *work) 275{ 276 struct smc_link_group *lgr = container_of(work, struct smc_link_group, 277 terminate_work); 278 279 __smc_lgr_terminate(lgr, true); 280} 281 282/* return next unique link id for the lgr */ 283static u8 smcr_next_link_id(struct smc_link_group *lgr) 284{ 285 u8 link_id; 286 int i; 287 288 while (1) { 289again: 290 link_id = ++lgr->next_link_id; 291 if (!link_id) /* skip zero as link_id */ 292 link_id = ++lgr->next_link_id; 293 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 294 if (smc_link_usable(&lgr->lnk[i]) && 295 lgr->lnk[i].link_id == link_id) 296 goto again; 297 } 298 break; 299 } 300 return link_id; 301} 302 303int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk, 304 u8 link_idx, struct smc_init_info *ini) 305{ 306 u8 rndvec[3]; 307 int rc; 308 309 get_device(&ini->ib_dev->ibdev->dev); 310 atomic_inc(&ini->ib_dev->lnk_cnt); 311 lnk->link_id = smcr_next_link_id(lgr); 312 lnk->lgr = lgr; 313 lnk->link_idx = link_idx; 314 lnk->smcibdev = ini->ib_dev; 315 lnk->ibport = ini->ib_port; 316 lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu; 317 smc_llc_link_set_uid(lnk); 318 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work); 319 if (!ini->ib_dev->initialized) { 320 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev); 321 if (rc) 322 goto out; 323 } 324 get_random_bytes(rndvec, sizeof(rndvec)); 325 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + 326 (rndvec[2] << 16); 327 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, 328 ini->vlan_id, lnk->gid, &lnk->sgid_index); 329 if (rc) 330 goto out; 331 rc = smc_llc_link_init(lnk); 332 if (rc) 333 goto out; 334 rc = smc_wr_alloc_link_mem(lnk); 335 if (rc) 336 goto clear_llc_lnk; 337 rc = smc_ib_create_protection_domain(lnk); 338 if (rc) 339 goto free_link_mem; 340 rc = smc_ib_create_queue_pair(lnk); 341 if (rc) 342 goto dealloc_pd; 343 rc = smc_wr_create_link(lnk); 344 if (rc) 345 goto destroy_qp; 346 lnk->state = SMC_LNK_ACTIVATING; 347 return 0; 348 349destroy_qp: 350 smc_ib_destroy_queue_pair(lnk); 351dealloc_pd: 352 smc_ib_dealloc_protection_domain(lnk); 353free_link_mem: 354 smc_wr_free_link_mem(lnk); 355clear_llc_lnk: 356 smc_llc_link_clear(lnk, false); 357out: 358 put_device(&ini->ib_dev->ibdev->dev); 359 memset(lnk, 0, sizeof(struct smc_link)); 360 lnk->state = SMC_LNK_UNUSED; 361 if (!atomic_dec_return(&ini->ib_dev->lnk_cnt)) 362 wake_up(&ini->ib_dev->lnks_deleted); 363 return rc; 364} 365 366/* create a new SMC link group */ 367static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) 368{ 369 struct smc_link_group *lgr; 370 struct list_head *lgr_list; 371 struct smc_link *lnk; 372 spinlock_t *lgr_lock; 373 u8 link_idx; 374 int rc = 0; 375 int i; 376 377 if (ini->is_smcd && ini->vlan_id) { 378 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected], 379 ini->vlan_id)) { 380 rc = SMC_CLC_DECL_ISMVLANERR; 381 goto out; 382 } 383 } 384 385 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); 386 if (!lgr) { 387 rc = SMC_CLC_DECL_MEM; 388 goto ism_put_vlan; 389 } 390 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0, 391 SMC_LGR_ID_SIZE, &lgr->id); 392 if (!lgr->tx_wq) { 393 rc = -ENOMEM; 394 goto free_lgr; 395 } 396 lgr->is_smcd = ini->is_smcd; 397 lgr->sync_err = 0; 398 lgr->terminating = 0; 399 lgr->freeing = 0; 400 lgr->vlan_id = ini->vlan_id; 401 mutex_init(&lgr->sndbufs_lock); 402 mutex_init(&lgr->rmbs_lock); 403 rwlock_init(&lgr->conns_lock); 404 for (i = 0; i < SMC_RMBE_SIZES; i++) { 405 INIT_LIST_HEAD(&lgr->sndbufs[i]); 406 INIT_LIST_HEAD(&lgr->rmbs[i]); 407 } 408 lgr->next_link_id = 0; 409 smc_lgr_list.num += SMC_LGR_NUM_INCR; 410 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); 411 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); 412 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work); 413 lgr->conns_all = RB_ROOT; 414 if (ini->is_smcd) { 415 /* SMC-D specific settings */ 416 get_device(&ini->ism_dev[ini->ism_selected]->dev); 417 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected]; 418 lgr->smcd = ini->ism_dev[ini->ism_selected]; 419 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list; 420 lgr_lock = &lgr->smcd->lgr_lock; 421 lgr->smc_version = ini->smcd_version; 422 lgr->peer_shutdown = 0; 423 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt); 424 } else { 425 /* SMC-R specific settings */ 426 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 427 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer, 428 SMC_SYSTEMID_LEN); 429 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1], 430 SMC_MAX_PNETID_LEN); 431 smc_llc_lgr_init(lgr, smc); 432 433 link_idx = SMC_SINGLE_LINK; 434 lnk = &lgr->lnk[link_idx]; 435 rc = smcr_link_init(lgr, lnk, link_idx, ini); 436 if (rc) 437 goto free_wq; 438 lgr_list = &smc_lgr_list.list; 439 lgr_lock = &smc_lgr_list.lock; 440 atomic_inc(&lgr_cnt); 441 } 442 smc->conn.lgr = lgr; 443 spin_lock_bh(lgr_lock); 444 list_add_tail(&lgr->list, lgr_list); 445 spin_unlock_bh(lgr_lock); 446 return 0; 447 448free_wq: 449 destroy_workqueue(lgr->tx_wq); 450free_lgr: 451 kfree(lgr); 452ism_put_vlan: 453 if (ini->is_smcd && ini->vlan_id) 454 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id); 455out: 456 if (rc < 0) { 457 if (rc == -ENOMEM) 458 rc = SMC_CLC_DECL_MEM; 459 else 460 rc = SMC_CLC_DECL_INTERR; 461 } 462 return rc; 463} 464 465static int smc_write_space(struct smc_connection *conn) 466{ 467 int buffer_len = conn->peer_rmbe_size; 468 union smc_host_cursor prod; 469 union smc_host_cursor cons; 470 int space; 471 472 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn); 473 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 474 /* determine rx_buf space */ 475 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod); 476 return space; 477} 478 479static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend, 480 struct smc_wr_buf *wr_buf) 481{ 482 struct smc_connection *conn = &smc->conn; 483 union smc_host_cursor cons, fin; 484 int rc = 0; 485 int diff; 486 487 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn); 488 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn); 489 /* set prod cursor to old state, enforce tx_rdma_writes() */ 490 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn); 491 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn); 492 493 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) { 494 /* cons cursor advanced more than fin, and prod was set 495 * fin above, so now prod is smaller than cons. Fix that. 496 */ 497 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons); 498 smc_curs_add(conn->sndbuf_desc->len, 499 &conn->tx_curs_sent, diff); 500 smc_curs_add(conn->sndbuf_desc->len, 501 &conn->tx_curs_fin, diff); 502 503 smp_mb__before_atomic(); 504 atomic_add(diff, &conn->sndbuf_space); 505 smp_mb__after_atomic(); 506 507 smc_curs_add(conn->peer_rmbe_size, 508 &conn->local_tx_ctrl.prod, diff); 509 smc_curs_add(conn->peer_rmbe_size, 510 &conn->local_tx_ctrl_fin, diff); 511 } 512 /* recalculate, value is used by tx_rdma_writes() */ 513 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn)); 514 515 if (smc->sk.sk_state != SMC_INIT && 516 smc->sk.sk_state != SMC_CLOSED) { 517 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf); 518 if (!rc) { 519 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0); 520 smc->sk.sk_data_ready(&smc->sk); 521 } 522 } else { 523 smc_wr_tx_put_slot(conn->lnk, 524 (struct smc_wr_tx_pend_priv *)pend); 525 } 526 return rc; 527} 528 529struct smc_link *smc_switch_conns(struct smc_link_group *lgr, 530 struct smc_link *from_lnk, bool is_dev_err) 531{ 532 struct smc_link *to_lnk = NULL; 533 struct smc_cdc_tx_pend *pend; 534 struct smc_connection *conn; 535 struct smc_wr_buf *wr_buf; 536 struct smc_sock *smc; 537 struct rb_node *node; 538 int i, rc = 0; 539 540 /* link is inactive, wake up tx waiters */ 541 smc_wr_wakeup_tx_wait(from_lnk); 542 543 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 544 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx) 545 continue; 546 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev && 547 from_lnk->ibport == lgr->lnk[i].ibport) { 548 continue; 549 } 550 to_lnk = &lgr->lnk[i]; 551 break; 552 } 553 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) { 554 smc_lgr_terminate_sched(lgr); 555 return NULL; 556 } 557again: 558 read_lock_bh(&lgr->conns_lock); 559 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) { 560 conn = rb_entry(node, struct smc_connection, alert_node); 561 if (conn->lnk != from_lnk) 562 continue; 563 smc = container_of(conn, struct smc_sock, conn); 564 /* conn->lnk not yet set in SMC_INIT state */ 565 if (smc->sk.sk_state == SMC_INIT) 566 continue; 567 if (smc->sk.sk_state == SMC_CLOSED || 568 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 || 569 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 || 570 smc->sk.sk_state == SMC_APPFINCLOSEWAIT || 571 smc->sk.sk_state == SMC_APPCLOSEWAIT1 || 572 smc->sk.sk_state == SMC_APPCLOSEWAIT2 || 573 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT || 574 smc->sk.sk_state == SMC_PEERABORTWAIT || 575 smc->sk.sk_state == SMC_PROCESSABORT) { 576 spin_lock_bh(&conn->send_lock); 577 conn->lnk = to_lnk; 578 spin_unlock_bh(&conn->send_lock); 579 continue; 580 } 581 sock_hold(&smc->sk); 582 read_unlock_bh(&lgr->conns_lock); 583 /* pre-fetch buffer outside of send_lock, might sleep */ 584 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend); 585 if (rc) 586 goto err_out; 587 /* avoid race with smcr_tx_sndbuf_nonempty() */ 588 spin_lock_bh(&conn->send_lock); 589 conn->lnk = to_lnk; 590 rc = smc_switch_cursor(smc, pend, wr_buf); 591 spin_unlock_bh(&conn->send_lock); 592 sock_put(&smc->sk); 593 if (rc) 594 goto err_out; 595 goto again; 596 } 597 read_unlock_bh(&lgr->conns_lock); 598 smc_wr_tx_link_put(to_lnk); 599 return to_lnk; 600 601err_out: 602 smcr_link_down_cond_sched(to_lnk); 603 smc_wr_tx_link_put(to_lnk); 604 return NULL; 605} 606 607static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc, 608 struct smc_link_group *lgr) 609{ 610 int rc; 611 612 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) { 613 /* unregister rmb with peer */ 614 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY); 615 if (!rc) { 616 /* protect against smc_llc_cli_rkey_exchange() */ 617 mutex_lock(&lgr->llc_conf_mutex); 618 smc_llc_do_delete_rkey(lgr, rmb_desc); 619 rmb_desc->is_conf_rkey = false; 620 mutex_unlock(&lgr->llc_conf_mutex); 621 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl); 622 } 623 } 624 625 if (rmb_desc->is_reg_err) { 626 /* buf registration failed, reuse not possible */ 627 mutex_lock(&lgr->rmbs_lock); 628 list_del(&rmb_desc->list); 629 mutex_unlock(&lgr->rmbs_lock); 630 631 smc_buf_free(lgr, true, rmb_desc); 632 } else { 633 rmb_desc->used = 0; 634 } 635} 636 637static void smc_buf_unuse(struct smc_connection *conn, 638 struct smc_link_group *lgr) 639{ 640 if (conn->sndbuf_desc) 641 conn->sndbuf_desc->used = 0; 642 if (conn->rmb_desc && lgr->is_smcd) 643 conn->rmb_desc->used = 0; 644 else if (conn->rmb_desc) 645 smcr_buf_unuse(conn->rmb_desc, lgr); 646} 647 648/* remove a finished connection from its link group */ 649void smc_conn_free(struct smc_connection *conn) 650{ 651 struct smc_link_group *lgr = conn->lgr; 652 653 if (!lgr) 654 return; 655 if (lgr->is_smcd) { 656 if (!list_empty(&lgr->list)) 657 smc_ism_unset_conn(conn); 658 tasklet_kill(&conn->rx_tsklet); 659 } else { 660 smc_cdc_wait_pend_tx_wr(conn); 661 if (current_work() != &conn->abort_work) 662 cancel_work_sync(&conn->abort_work); 663 } 664 if (!list_empty(&lgr->list)) { 665 smc_buf_unuse(conn, lgr); /* allow buffer reuse */ 666 smc_lgr_unregister_conn(conn); 667 } 668 669 if (!lgr->conns_num) 670 smc_lgr_schedule_free_work(lgr); 671} 672 673/* unregister a link from a buf_desc */ 674static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb, 675 struct smc_link *lnk) 676{ 677 if (is_rmb) 678 buf_desc->is_reg_mr[lnk->link_idx] = false; 679 if (!buf_desc->is_map_ib[lnk->link_idx]) 680 return; 681 if (is_rmb) { 682 if (buf_desc->mr_rx[lnk->link_idx]) { 683 smc_ib_put_memory_region( 684 buf_desc->mr_rx[lnk->link_idx]); 685 buf_desc->mr_rx[lnk->link_idx] = NULL; 686 } 687 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE); 688 } else { 689 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE); 690 } 691 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 692 buf_desc->is_map_ib[lnk->link_idx] = false; 693} 694 695/* unmap all buffers of lgr for a deleted link */ 696static void smcr_buf_unmap_lgr(struct smc_link *lnk) 697{ 698 struct smc_link_group *lgr = lnk->lgr; 699 struct smc_buf_desc *buf_desc, *bf; 700 int i; 701 702 for (i = 0; i < SMC_RMBE_SIZES; i++) { 703 mutex_lock(&lgr->rmbs_lock); 704 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) 705 smcr_buf_unmap_link(buf_desc, true, lnk); 706 mutex_unlock(&lgr->rmbs_lock); 707 mutex_lock(&lgr->sndbufs_lock); 708 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], 709 list) 710 smcr_buf_unmap_link(buf_desc, false, lnk); 711 mutex_unlock(&lgr->sndbufs_lock); 712 } 713} 714 715static void smcr_rtoken_clear_link(struct smc_link *lnk) 716{ 717 struct smc_link_group *lgr = lnk->lgr; 718 int i; 719 720 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 721 lgr->rtokens[i][lnk->link_idx].rkey = 0; 722 lgr->rtokens[i][lnk->link_idx].dma_addr = 0; 723 } 724} 725 726/* must be called under lgr->llc_conf_mutex lock */ 727void smcr_link_clear(struct smc_link *lnk, bool log) 728{ 729 struct smc_ib_device *smcibdev; 730 731 if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED) 732 return; 733 lnk->peer_qpn = 0; 734 smc_llc_link_clear(lnk, log); 735 smcr_buf_unmap_lgr(lnk); 736 smcr_rtoken_clear_link(lnk); 737 smc_ib_modify_qp_error(lnk); 738 smc_wr_free_link(lnk); 739 smc_ib_destroy_queue_pair(lnk); 740 smc_ib_dealloc_protection_domain(lnk); 741 smc_wr_free_link_mem(lnk); 742 put_device(&lnk->smcibdev->ibdev->dev); 743 smcibdev = lnk->smcibdev; 744 memset(lnk, 0, sizeof(struct smc_link)); 745 lnk->state = SMC_LNK_UNUSED; 746 if (!atomic_dec_return(&smcibdev->lnk_cnt)) 747 wake_up(&smcibdev->lnks_deleted); 748} 749 750static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, 751 struct smc_buf_desc *buf_desc) 752{ 753 int i; 754 755 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 756 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]); 757 758 if (buf_desc->pages) 759 __free_pages(buf_desc->pages, buf_desc->order); 760 kfree(buf_desc); 761} 762 763static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, 764 struct smc_buf_desc *buf_desc) 765{ 766 if (is_dmb) { 767 /* restore original buf len */ 768 buf_desc->len += sizeof(struct smcd_cdc_msg); 769 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 770 } else { 771 kfree(buf_desc->cpu_addr); 772 } 773 kfree(buf_desc); 774} 775 776static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, 777 struct smc_buf_desc *buf_desc) 778{ 779 if (lgr->is_smcd) 780 smcd_buf_free(lgr, is_rmb, buf_desc); 781 else 782 smcr_buf_free(lgr, is_rmb, buf_desc); 783} 784 785static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) 786{ 787 struct smc_buf_desc *buf_desc, *bf_desc; 788 struct list_head *buf_list; 789 int i; 790 791 for (i = 0; i < SMC_RMBE_SIZES; i++) { 792 if (is_rmb) 793 buf_list = &lgr->rmbs[i]; 794 else 795 buf_list = &lgr->sndbufs[i]; 796 list_for_each_entry_safe(buf_desc, bf_desc, buf_list, 797 list) { 798 list_del(&buf_desc->list); 799 smc_buf_free(lgr, is_rmb, buf_desc); 800 } 801 } 802} 803 804static void smc_lgr_free_bufs(struct smc_link_group *lgr) 805{ 806 /* free send buffers */ 807 __smc_lgr_free_bufs(lgr, false); 808 /* free rmbs */ 809 __smc_lgr_free_bufs(lgr, true); 810} 811 812/* remove a link group */ 813static void smc_lgr_free(struct smc_link_group *lgr) 814{ 815 int i; 816 817 if (!lgr->is_smcd) { 818 mutex_lock(&lgr->llc_conf_mutex); 819 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 820 if (lgr->lnk[i].state != SMC_LNK_UNUSED) 821 smcr_link_clear(&lgr->lnk[i], false); 822 } 823 mutex_unlock(&lgr->llc_conf_mutex); 824 smc_llc_lgr_clear(lgr); 825 } 826 827 smc_lgr_free_bufs(lgr); 828 destroy_workqueue(lgr->tx_wq); 829 if (lgr->is_smcd) { 830 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); 831 put_device(&lgr->smcd->dev); 832 if (!atomic_dec_return(&lgr->smcd->lgr_cnt)) 833 wake_up(&lgr->smcd->lgrs_deleted); 834 } else { 835 if (!atomic_dec_return(&lgr_cnt)) 836 wake_up(&lgrs_deleted); 837 } 838 kfree(lgr); 839} 840 841static void smcd_unregister_all_dmbs(struct smc_link_group *lgr) 842{ 843 int i; 844 845 for (i = 0; i < SMC_RMBE_SIZES; i++) { 846 struct smc_buf_desc *buf_desc; 847 848 list_for_each_entry(buf_desc, &lgr->rmbs[i], list) { 849 buf_desc->len += sizeof(struct smcd_cdc_msg); 850 smc_ism_unregister_dmb(lgr->smcd, buf_desc); 851 } 852 } 853} 854 855static void smc_sk_wake_ups(struct smc_sock *smc) 856{ 857 smc->sk.sk_write_space(&smc->sk); 858 smc->sk.sk_data_ready(&smc->sk); 859 smc->sk.sk_state_change(&smc->sk); 860} 861 862/* kill a connection */ 863static void smc_conn_kill(struct smc_connection *conn, bool soft) 864{ 865 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 866 867 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown) 868 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; 869 else 870 smc_close_abort(conn); 871 conn->killed = 1; 872 smc->sk.sk_err = ECONNABORTED; 873 smc_sk_wake_ups(smc); 874 if (conn->lgr->is_smcd) { 875 smc_ism_unset_conn(conn); 876 if (soft) 877 tasklet_kill(&conn->rx_tsklet); 878 else 879 tasklet_unlock_wait(&conn->rx_tsklet); 880 } else { 881 smc_cdc_wait_pend_tx_wr(conn); 882 } 883 smc_lgr_unregister_conn(conn); 884 smc_close_active_abort(smc); 885} 886 887static void smc_lgr_cleanup(struct smc_link_group *lgr) 888{ 889 if (lgr->is_smcd) { 890 smc_ism_signal_shutdown(lgr); 891 smcd_unregister_all_dmbs(lgr); 892 } else { 893 u32 rsn = lgr->llc_termination_rsn; 894 895 if (!rsn) 896 rsn = SMC_LLC_DEL_PROG_INIT_TERM; 897 smc_llc_send_link_delete_all(lgr, false, rsn); 898 smcr_lgr_link_deactivate_all(lgr); 899 } 900} 901 902/* terminate link group 903 * @soft: true if link group shutdown can take its time 904 * false if immediate link group shutdown is required 905 */ 906static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft) 907{ 908 struct smc_connection *conn; 909 struct smc_sock *smc; 910 struct rb_node *node; 911 912 if (lgr->terminating) 913 return; /* lgr already terminating */ 914 /* cancel free_work sync, will terminate when lgr->freeing is set */ 915 cancel_delayed_work(&lgr->free_work); 916 lgr->terminating = 1; 917 918 /* kill remaining link group connections */ 919 read_lock_bh(&lgr->conns_lock); 920 node = rb_first(&lgr->conns_all); 921 while (node) { 922 read_unlock_bh(&lgr->conns_lock); 923 conn = rb_entry(node, struct smc_connection, alert_node); 924 smc = container_of(conn, struct smc_sock, conn); 925 sock_hold(&smc->sk); /* sock_put below */ 926 lock_sock(&smc->sk); 927 smc_conn_kill(conn, soft); 928 release_sock(&smc->sk); 929 sock_put(&smc->sk); /* sock_hold above */ 930 read_lock_bh(&lgr->conns_lock); 931 node = rb_first(&lgr->conns_all); 932 } 933 read_unlock_bh(&lgr->conns_lock); 934 smc_lgr_cleanup(lgr); 935 smc_lgr_free(lgr); 936} 937 938/* unlink link group and schedule termination */ 939void smc_lgr_terminate_sched(struct smc_link_group *lgr) 940{ 941 spinlock_t *lgr_lock; 942 943 smc_lgr_list_head(lgr, &lgr_lock); 944 spin_lock_bh(lgr_lock); 945 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) { 946 spin_unlock_bh(lgr_lock); 947 return; /* lgr already terminating */ 948 } 949 list_del_init(&lgr->list); 950 lgr->freeing = 1; 951 spin_unlock_bh(lgr_lock); 952 schedule_work(&lgr->terminate_work); 953} 954 955/* Called when peer lgr shutdown (regularly or abnormally) is received */ 956void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan) 957{ 958 struct smc_link_group *lgr, *l; 959 LIST_HEAD(lgr_free_list); 960 961 /* run common cleanup function and build free list */ 962 spin_lock_bh(&dev->lgr_lock); 963 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) { 964 if ((!peer_gid || lgr->peer_gid == peer_gid) && 965 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { 966 if (peer_gid) /* peer triggered termination */ 967 lgr->peer_shutdown = 1; 968 list_move(&lgr->list, &lgr_free_list); 969 lgr->freeing = 1; 970 } 971 } 972 spin_unlock_bh(&dev->lgr_lock); 973 974 /* cancel the regular free workers and actually free lgrs */ 975 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { 976 list_del_init(&lgr->list); 977 schedule_work(&lgr->terminate_work); 978 } 979} 980 981/* Called when an SMCD device is removed or the smc module is unloaded */ 982void smc_smcd_terminate_all(struct smcd_dev *smcd) 983{ 984 struct smc_link_group *lgr, *lg; 985 LIST_HEAD(lgr_free_list); 986 987 spin_lock_bh(&smcd->lgr_lock); 988 list_splice_init(&smcd->lgr_list, &lgr_free_list); 989 list_for_each_entry(lgr, &lgr_free_list, list) 990 lgr->freeing = 1; 991 spin_unlock_bh(&smcd->lgr_lock); 992 993 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 994 list_del_init(&lgr->list); 995 __smc_lgr_terminate(lgr, false); 996 } 997 998 if (atomic_read(&smcd->lgr_cnt)) 999 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt)); 1000} 1001 1002/* Called when an SMCR device is removed or the smc module is unloaded. 1003 * If smcibdev is given, all SMCR link groups using this device are terminated. 1004 * If smcibdev is NULL, all SMCR link groups are terminated. 1005 */ 1006void smc_smcr_terminate_all(struct smc_ib_device *smcibdev) 1007{ 1008 struct smc_link_group *lgr, *lg; 1009 LIST_HEAD(lgr_free_list); 1010 int i; 1011 1012 spin_lock_bh(&smc_lgr_list.lock); 1013 if (!smcibdev) { 1014 list_splice_init(&smc_lgr_list.list, &lgr_free_list); 1015 list_for_each_entry(lgr, &lgr_free_list, list) 1016 lgr->freeing = 1; 1017 } else { 1018 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) { 1019 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1020 if (lgr->lnk[i].smcibdev == smcibdev) 1021 smcr_link_down_cond_sched(&lgr->lnk[i]); 1022 } 1023 } 1024 } 1025 spin_unlock_bh(&smc_lgr_list.lock); 1026 1027 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) { 1028 list_del_init(&lgr->list); 1029 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM); 1030 __smc_lgr_terminate(lgr, false); 1031 } 1032 1033 if (smcibdev) { 1034 if (atomic_read(&smcibdev->lnk_cnt)) 1035 wait_event(smcibdev->lnks_deleted, 1036 !atomic_read(&smcibdev->lnk_cnt)); 1037 } else { 1038 if (atomic_read(&lgr_cnt)) 1039 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt)); 1040 } 1041} 1042 1043/* set new lgr type and clear all asymmetric link tagging */ 1044void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type) 1045{ 1046 char *lgr_type = ""; 1047 int i; 1048 1049 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) 1050 if (smc_link_usable(&lgr->lnk[i])) 1051 lgr->lnk[i].link_is_asym = false; 1052 if (lgr->type == new_type) 1053 return; 1054 lgr->type = new_type; 1055 1056 switch (lgr->type) { 1057 case SMC_LGR_NONE: 1058 lgr_type = "NONE"; 1059 break; 1060 case SMC_LGR_SINGLE: 1061 lgr_type = "SINGLE"; 1062 break; 1063 case SMC_LGR_SYMMETRIC: 1064 lgr_type = "SYMMETRIC"; 1065 break; 1066 case SMC_LGR_ASYMMETRIC_PEER: 1067 lgr_type = "ASYMMETRIC_PEER"; 1068 break; 1069 case SMC_LGR_ASYMMETRIC_LOCAL: 1070 lgr_type = "ASYMMETRIC_LOCAL"; 1071 break; 1072 } 1073 pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: " 1074 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id, 1075 lgr_type, lgr->pnet_id); 1076} 1077 1078/* set new lgr type and tag a link as asymmetric */ 1079void smcr_lgr_set_type_asym(struct smc_link_group *lgr, 1080 enum smc_lgr_type new_type, int asym_lnk_idx) 1081{ 1082 smcr_lgr_set_type(lgr, new_type); 1083 lgr->lnk[asym_lnk_idx].link_is_asym = true; 1084} 1085 1086/* abort connection, abort_work scheduled from tasklet context */ 1087static void smc_conn_abort_work(struct work_struct *work) 1088{ 1089 struct smc_connection *conn = container_of(work, 1090 struct smc_connection, 1091 abort_work); 1092 struct smc_sock *smc = container_of(conn, struct smc_sock, conn); 1093 1094 lock_sock(&smc->sk); 1095 smc_conn_kill(conn, true); 1096 release_sock(&smc->sk); 1097 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */ 1098} 1099 1100void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport) 1101{ 1102 struct smc_link_group *lgr, *n; 1103 1104 spin_lock_bh(&smc_lgr_list.lock); 1105 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1106 struct smc_link *link; 1107 1108 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1109 SMC_MAX_PNETID_LEN) || 1110 lgr->type == SMC_LGR_SYMMETRIC || 1111 lgr->type == SMC_LGR_ASYMMETRIC_PEER) 1112 continue; 1113 1114 /* trigger local add link processing */ 1115 link = smc_llc_usable_link(lgr); 1116 if (link) 1117 smc_llc_add_link_local(link); 1118 } 1119 spin_unlock_bh(&smc_lgr_list.lock); 1120} 1121 1122/* link is down - switch connections to alternate link, 1123 * must be called under lgr->llc_conf_mutex lock 1124 */ 1125static void smcr_link_down(struct smc_link *lnk) 1126{ 1127 struct smc_link_group *lgr = lnk->lgr; 1128 struct smc_link *to_lnk; 1129 int del_link_id; 1130 1131 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list)) 1132 return; 1133 1134 to_lnk = smc_switch_conns(lgr, lnk, true); 1135 if (!to_lnk) { /* no backup link available */ 1136 smcr_link_clear(lnk, true); 1137 return; 1138 } 1139 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE); 1140 del_link_id = lnk->link_id; 1141 1142 if (lgr->role == SMC_SERV) { 1143 /* trigger local delete link processing */ 1144 smc_llc_srv_delete_link_local(to_lnk, del_link_id); 1145 } else { 1146 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) { 1147 /* another llc task is ongoing */ 1148 mutex_unlock(&lgr->llc_conf_mutex); 1149 wait_event_timeout(lgr->llc_flow_waiter, 1150 (list_empty(&lgr->list) || 1151 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE), 1152 SMC_LLC_WAIT_TIME); 1153 mutex_lock(&lgr->llc_conf_mutex); 1154 } 1155 if (!list_empty(&lgr->list)) { 1156 smc_llc_send_delete_link(to_lnk, del_link_id, 1157 SMC_LLC_REQ, true, 1158 SMC_LLC_DEL_LOST_PATH); 1159 smcr_link_clear(lnk, true); 1160 } 1161 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */ 1162 } 1163} 1164 1165/* must be called under lgr->llc_conf_mutex lock */ 1166void smcr_link_down_cond(struct smc_link *lnk) 1167{ 1168 if (smc_link_downing(&lnk->state)) 1169 smcr_link_down(lnk); 1170} 1171 1172/* will get the lgr->llc_conf_mutex lock */ 1173void smcr_link_down_cond_sched(struct smc_link *lnk) 1174{ 1175 if (smc_link_downing(&lnk->state)) 1176 schedule_work(&lnk->link_down_wrk); 1177} 1178 1179void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport) 1180{ 1181 struct smc_link_group *lgr, *n; 1182 int i; 1183 1184 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) { 1185 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id, 1186 SMC_MAX_PNETID_LEN)) 1187 continue; /* lgr is not affected */ 1188 if (list_empty(&lgr->list)) 1189 continue; 1190 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1191 struct smc_link *lnk = &lgr->lnk[i]; 1192 1193 if (smc_link_usable(lnk) && 1194 lnk->smcibdev == smcibdev && lnk->ibport == ibport) 1195 smcr_link_down_cond_sched(lnk); 1196 } 1197 } 1198} 1199 1200static void smc_link_down_work(struct work_struct *work) 1201{ 1202 struct smc_link *link = container_of(work, struct smc_link, 1203 link_down_wrk); 1204 struct smc_link_group *lgr = link->lgr; 1205 1206 if (list_empty(&lgr->list)) 1207 return; 1208 wake_up_all(&lgr->llc_msg_waiter); 1209 mutex_lock(&lgr->llc_conf_mutex); 1210 smcr_link_down(link); 1211 mutex_unlock(&lgr->llc_conf_mutex); 1212} 1213 1214static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev, 1215 struct netdev_nested_priv *priv) 1216{ 1217 unsigned short *vlan_id = (unsigned short *)priv->data; 1218 1219 if (is_vlan_dev(lower_dev)) { 1220 *vlan_id = vlan_dev_vlan_id(lower_dev); 1221 return 1; 1222 } 1223 1224 return 0; 1225} 1226 1227/* Determine vlan of internal TCP socket. */ 1228int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) 1229{ 1230 struct dst_entry *dst = sk_dst_get(clcsock->sk); 1231 struct netdev_nested_priv priv; 1232 struct net_device *ndev; 1233 int rc = 0; 1234 1235 ini->vlan_id = 0; 1236 if (!dst) { 1237 rc = -ENOTCONN; 1238 goto out; 1239 } 1240 if (!dst->dev) { 1241 rc = -ENODEV; 1242 goto out_rel; 1243 } 1244 1245 ndev = dst->dev; 1246 if (is_vlan_dev(ndev)) { 1247 ini->vlan_id = vlan_dev_vlan_id(ndev); 1248 goto out_rel; 1249 } 1250 1251 priv.data = (void *)&ini->vlan_id; 1252 rtnl_lock(); 1253 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv); 1254 rtnl_unlock(); 1255 1256out_rel: 1257 dst_release(dst); 1258out: 1259 return rc; 1260} 1261 1262static bool smcr_lgr_match(struct smc_link_group *lgr, 1263 struct smc_clc_msg_local *lcl, 1264 enum smc_lgr_role role, u32 clcqpn) 1265{ 1266 int i; 1267 1268 if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) || 1269 lgr->role != role) 1270 return false; 1271 1272 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1273 if (!smc_link_active(&lgr->lnk[i])) 1274 continue; 1275 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) && 1276 !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) && 1277 !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac))) 1278 return true; 1279 } 1280 return false; 1281} 1282 1283static bool smcd_lgr_match(struct smc_link_group *lgr, 1284 struct smcd_dev *smcismdev, u64 peer_gid) 1285{ 1286 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; 1287} 1288 1289/* create a new SMC connection (and a new link group if necessary) */ 1290int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) 1291{ 1292 struct smc_connection *conn = &smc->conn; 1293 struct list_head *lgr_list; 1294 struct smc_link_group *lgr; 1295 enum smc_lgr_role role; 1296 spinlock_t *lgr_lock; 1297 int rc = 0; 1298 1299 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list : 1300 &smc_lgr_list.list; 1301 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock : 1302 &smc_lgr_list.lock; 1303 ini->first_contact_local = 1; 1304 role = smc->listen_smc ? SMC_SERV : SMC_CLNT; 1305 if (role == SMC_CLNT && ini->first_contact_peer) 1306 /* create new link group as well */ 1307 goto create; 1308 1309 /* determine if an existing link group can be reused */ 1310 spin_lock_bh(lgr_lock); 1311 list_for_each_entry(lgr, lgr_list, list) { 1312 write_lock_bh(&lgr->conns_lock); 1313 if ((ini->is_smcd ? 1314 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected], 1315 ini->ism_peer_gid[ini->ism_selected]) : 1316 smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) && 1317 !lgr->sync_err && 1318 (ini->smcd_version == SMC_V2 || 1319 lgr->vlan_id == ini->vlan_id) && 1320 (role == SMC_CLNT || ini->is_smcd || 1321 (lgr->conns_num < SMC_RMBS_PER_LGR_MAX && 1322 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) { 1323 /* link group found */ 1324 ini->first_contact_local = 0; 1325 conn->lgr = lgr; 1326 rc = smc_lgr_register_conn(conn, false); 1327 write_unlock_bh(&lgr->conns_lock); 1328 if (!rc && delayed_work_pending(&lgr->free_work)) 1329 cancel_delayed_work(&lgr->free_work); 1330 break; 1331 } 1332 write_unlock_bh(&lgr->conns_lock); 1333 } 1334 spin_unlock_bh(lgr_lock); 1335 if (rc) 1336 return rc; 1337 1338 if (role == SMC_CLNT && !ini->first_contact_peer && 1339 ini->first_contact_local) { 1340 /* Server reuses a link group, but Client wants to start 1341 * a new one 1342 * send out_of_sync decline, reason synchr. error 1343 */ 1344 return SMC_CLC_DECL_SYNCERR; 1345 } 1346 1347create: 1348 if (ini->first_contact_local) { 1349 rc = smc_lgr_create(smc, ini); 1350 if (rc) 1351 goto out; 1352 lgr = conn->lgr; 1353 write_lock_bh(&lgr->conns_lock); 1354 rc = smc_lgr_register_conn(conn, true); 1355 write_unlock_bh(&lgr->conns_lock); 1356 if (rc) 1357 goto out; 1358 } 1359 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; 1360 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; 1361 conn->urg_state = SMC_URG_READ; 1362 init_waitqueue_head(&conn->cdc_pend_tx_wq); 1363 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work); 1364 if (ini->is_smcd) { 1365 conn->rx_off = sizeof(struct smcd_cdc_msg); 1366 smcd_cdc_rx_init(conn); /* init tasklet for this conn */ 1367 } else { 1368 conn->rx_off = 0; 1369 } 1370#ifndef KERNEL_HAS_ATOMIC64 1371 spin_lock_init(&conn->acurs_lock); 1372#endif 1373 1374out: 1375 return rc; 1376} 1377 1378/* convert the RMB size into the compressed notation - minimum 16K. 1379 * In contrast to plain ilog2, this rounds towards the next power of 2, 1380 * so the socket application gets at least its desired sndbuf / rcvbuf size. 1381 */ 1382static u8 smc_compress_bufsize(int size) 1383{ 1384 u8 compressed; 1385 1386 if (size <= SMC_BUF_MIN_SIZE) 1387 return 0; 1388 1389 size = (size - 1) >> 14; 1390 compressed = ilog2(size) + 1; 1391 if (compressed >= SMC_RMBE_SIZES) 1392 compressed = SMC_RMBE_SIZES - 1; 1393 return compressed; 1394} 1395 1396/* convert the RMB size from compressed notation into integer */ 1397int smc_uncompress_bufsize(u8 compressed) 1398{ 1399 u32 size; 1400 1401 size = 0x00000001 << (((int)compressed) + 14); 1402 return (int)size; 1403} 1404 1405/* try to reuse a sndbuf or rmb description slot for a certain 1406 * buffer size; if not available, return NULL 1407 */ 1408static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, 1409 struct mutex *lock, 1410 struct list_head *buf_list) 1411{ 1412 struct smc_buf_desc *buf_slot; 1413 1414 mutex_lock(lock); 1415 list_for_each_entry(buf_slot, buf_list, list) { 1416 if (cmpxchg(&buf_slot->used, 0, 1) == 0) { 1417 mutex_unlock(lock); 1418 return buf_slot; 1419 } 1420 } 1421 mutex_unlock(lock); 1422 return NULL; 1423} 1424 1425/* one of the conditions for announcing a receiver's current window size is 1426 * that it "results in a minimum increase in the window size of 10% of the 1427 * receive buffer space" [RFC7609] 1428 */ 1429static inline int smc_rmb_wnd_update_limit(int rmbe_size) 1430{ 1431 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); 1432} 1433 1434/* map an rmb buf to a link */ 1435static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb, 1436 struct smc_link *lnk) 1437{ 1438 int rc; 1439 1440 if (buf_desc->is_map_ib[lnk->link_idx]) 1441 return 0; 1442 1443 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL); 1444 if (rc) 1445 return rc; 1446 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl, 1447 buf_desc->cpu_addr, buf_desc->len); 1448 1449 /* map sg table to DMA address */ 1450 rc = smc_ib_buf_map_sg(lnk, buf_desc, 1451 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 1452 /* SMC protocol depends on mapping to one DMA address only */ 1453 if (rc != 1) { 1454 rc = -EAGAIN; 1455 goto free_table; 1456 } 1457 1458 /* create a new memory region for the RMB */ 1459 if (is_rmb) { 1460 rc = smc_ib_get_memory_region(lnk->roce_pd, 1461 IB_ACCESS_REMOTE_WRITE | 1462 IB_ACCESS_LOCAL_WRITE, 1463 buf_desc, lnk->link_idx); 1464 if (rc) 1465 goto buf_unmap; 1466 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE); 1467 } 1468 buf_desc->is_map_ib[lnk->link_idx] = true; 1469 return 0; 1470 1471buf_unmap: 1472 smc_ib_buf_unmap_sg(lnk, buf_desc, 1473 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); 1474free_table: 1475 sg_free_table(&buf_desc->sgt[lnk->link_idx]); 1476 return rc; 1477} 1478 1479/* register a new rmb on IB device, 1480 * must be called under lgr->llc_conf_mutex lock 1481 */ 1482int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc) 1483{ 1484 if (list_empty(&link->lgr->list)) 1485 return -ENOLINK; 1486 if (!rmb_desc->is_reg_mr[link->link_idx]) { 1487 /* register memory region for new rmb */ 1488 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) { 1489 rmb_desc->is_reg_err = true; 1490 return -EFAULT; 1491 } 1492 rmb_desc->is_reg_mr[link->link_idx] = true; 1493 } 1494 return 0; 1495} 1496 1497static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock, 1498 struct list_head *lst, bool is_rmb) 1499{ 1500 struct smc_buf_desc *buf_desc, *bf; 1501 int rc = 0; 1502 1503 mutex_lock(lock); 1504 list_for_each_entry_safe(buf_desc, bf, lst, list) { 1505 if (!buf_desc->used) 1506 continue; 1507 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk); 1508 if (rc) 1509 goto out; 1510 } 1511out: 1512 mutex_unlock(lock); 1513 return rc; 1514} 1515 1516/* map all used buffers of lgr for a new link */ 1517int smcr_buf_map_lgr(struct smc_link *lnk) 1518{ 1519 struct smc_link_group *lgr = lnk->lgr; 1520 int i, rc = 0; 1521 1522 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1523 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock, 1524 &lgr->rmbs[i], true); 1525 if (rc) 1526 return rc; 1527 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock, 1528 &lgr->sndbufs[i], false); 1529 if (rc) 1530 return rc; 1531 } 1532 return 0; 1533} 1534 1535/* register all used buffers of lgr for a new link, 1536 * must be called under lgr->llc_conf_mutex lock 1537 */ 1538int smcr_buf_reg_lgr(struct smc_link *lnk) 1539{ 1540 struct smc_link_group *lgr = lnk->lgr; 1541 struct smc_buf_desc *buf_desc, *bf; 1542 int i, rc = 0; 1543 1544 mutex_lock(&lgr->rmbs_lock); 1545 for (i = 0; i < SMC_RMBE_SIZES; i++) { 1546 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) { 1547 if (!buf_desc->used) 1548 continue; 1549 rc = smcr_link_reg_rmb(lnk, buf_desc); 1550 if (rc) 1551 goto out; 1552 } 1553 } 1554out: 1555 mutex_unlock(&lgr->rmbs_lock); 1556 return rc; 1557} 1558 1559static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, 1560 bool is_rmb, int bufsize) 1561{ 1562 struct smc_buf_desc *buf_desc; 1563 1564 /* try to alloc a new buffer */ 1565 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 1566 if (!buf_desc) 1567 return ERR_PTR(-ENOMEM); 1568 1569 buf_desc->order = get_order(bufsize); 1570 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | 1571 __GFP_NOMEMALLOC | __GFP_COMP | 1572 __GFP_NORETRY | __GFP_ZERO, 1573 buf_desc->order); 1574 if (!buf_desc->pages) { 1575 kfree(buf_desc); 1576 return ERR_PTR(-EAGAIN); 1577 } 1578 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages); 1579 buf_desc->len = bufsize; 1580 return buf_desc; 1581} 1582 1583/* map buf_desc on all usable links, 1584 * unused buffers stay mapped as long as the link is up 1585 */ 1586static int smcr_buf_map_usable_links(struct smc_link_group *lgr, 1587 struct smc_buf_desc *buf_desc, bool is_rmb) 1588{ 1589 int i, rc = 0, cnt = 0; 1590 1591 /* protect against parallel link reconfiguration */ 1592 mutex_lock(&lgr->llc_conf_mutex); 1593 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1594 struct smc_link *lnk = &lgr->lnk[i]; 1595 1596 if (!smc_link_usable(lnk)) 1597 continue; 1598 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) { 1599 rc = -ENOMEM; 1600 goto out; 1601 } 1602 cnt++; 1603 } 1604out: 1605 mutex_unlock(&lgr->llc_conf_mutex); 1606 if (!rc && !cnt) 1607 rc = -EINVAL; 1608 return rc; 1609} 1610 1611#define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ 1612 1613static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, 1614 bool is_dmb, int bufsize) 1615{ 1616 struct smc_buf_desc *buf_desc; 1617 int rc; 1618 1619 if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES) 1620 return ERR_PTR(-EAGAIN); 1621 1622 /* try to alloc a new DMB */ 1623 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); 1624 if (!buf_desc) 1625 return ERR_PTR(-ENOMEM); 1626 if (is_dmb) { 1627 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); 1628 if (rc) { 1629 kfree(buf_desc); 1630 if (rc == -ENOMEM) 1631 return ERR_PTR(-EAGAIN); 1632 if (rc == -ENOSPC) 1633 return ERR_PTR(-ENOSPC); 1634 return ERR_PTR(-EIO); 1635 } 1636 buf_desc->pages = virt_to_page(buf_desc->cpu_addr); 1637 /* CDC header stored in buf. So, pretend it was smaller */ 1638 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); 1639 } else { 1640 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | 1641 __GFP_NOWARN | __GFP_NORETRY | 1642 __GFP_NOMEMALLOC); 1643 if (!buf_desc->cpu_addr) { 1644 kfree(buf_desc); 1645 return ERR_PTR(-EAGAIN); 1646 } 1647 buf_desc->len = bufsize; 1648 } 1649 return buf_desc; 1650} 1651 1652static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) 1653{ 1654 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); 1655 struct smc_connection *conn = &smc->conn; 1656 struct smc_link_group *lgr = conn->lgr; 1657 struct list_head *buf_list; 1658 int bufsize, bufsize_short; 1659 struct mutex *lock; /* lock buffer list */ 1660 int sk_buf_size; 1661 1662 if (is_rmb) 1663 /* use socket recv buffer size (w/o overhead) as start value */ 1664 sk_buf_size = smc->sk.sk_rcvbuf / 2; 1665 else 1666 /* use socket send buffer size (w/o overhead) as start value */ 1667 sk_buf_size = smc->sk.sk_sndbuf / 2; 1668 1669 for (bufsize_short = smc_compress_bufsize(sk_buf_size); 1670 bufsize_short >= 0; bufsize_short--) { 1671 1672 if (is_rmb) { 1673 lock = &lgr->rmbs_lock; 1674 buf_list = &lgr->rmbs[bufsize_short]; 1675 } else { 1676 lock = &lgr->sndbufs_lock; 1677 buf_list = &lgr->sndbufs[bufsize_short]; 1678 } 1679 bufsize = smc_uncompress_bufsize(bufsize_short); 1680 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC) 1681 continue; 1682 1683 /* check for reusable slot in the link group */ 1684 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list); 1685 if (buf_desc) { 1686 memset(buf_desc->cpu_addr, 0, bufsize); 1687 break; /* found reusable slot */ 1688 } 1689 1690 if (is_smcd) 1691 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); 1692 else 1693 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); 1694 1695 if (PTR_ERR(buf_desc) == -ENOMEM) 1696 break; 1697 if (IS_ERR(buf_desc)) 1698 continue; 1699 1700 buf_desc->used = 1; 1701 mutex_lock(lock); 1702 list_add(&buf_desc->list, buf_list); 1703 mutex_unlock(lock); 1704 break; /* found */ 1705 } 1706 1707 if (IS_ERR(buf_desc)) 1708 return PTR_ERR(buf_desc); 1709 1710 if (!is_smcd) { 1711 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) { 1712 smcr_buf_unuse(buf_desc, lgr); 1713 return -ENOMEM; 1714 } 1715 } 1716 1717 if (is_rmb) { 1718 conn->rmb_desc = buf_desc; 1719 conn->rmbe_size_short = bufsize_short; 1720 smc->sk.sk_rcvbuf = bufsize * 2; 1721 atomic_set(&conn->bytes_to_rcv, 0); 1722 conn->rmbe_update_limit = 1723 smc_rmb_wnd_update_limit(buf_desc->len); 1724 if (is_smcd) 1725 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ 1726 } else { 1727 conn->sndbuf_desc = buf_desc; 1728 smc->sk.sk_sndbuf = bufsize * 2; 1729 atomic_set(&conn->sndbuf_space, bufsize); 1730 } 1731 return 0; 1732} 1733 1734void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn) 1735{ 1736 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk)) 1737 return; 1738 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 1739} 1740 1741void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) 1742{ 1743 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk)) 1744 return; 1745 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE); 1746} 1747 1748void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) 1749{ 1750 int i; 1751 1752 if (!conn->lgr || conn->lgr->is_smcd) 1753 return; 1754 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1755 if (!smc_link_active(&conn->lgr->lnk[i])) 1756 continue; 1757 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc, 1758 DMA_FROM_DEVICE); 1759 } 1760} 1761 1762void smc_rmb_sync_sg_for_device(struct smc_connection *conn) 1763{ 1764 int i; 1765 1766 if (!conn->lgr || conn->lgr->is_smcd) 1767 return; 1768 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) { 1769 if (!smc_link_active(&conn->lgr->lnk[i])) 1770 continue; 1771 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc, 1772 DMA_FROM_DEVICE); 1773 } 1774} 1775 1776/* create the send and receive buffer for an SMC socket; 1777 * receive buffers are called RMBs; 1778 * (even though the SMC protocol allows more than one RMB-element per RMB, 1779 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an 1780 * extra RMB for every connection in a link group 1781 */ 1782int smc_buf_create(struct smc_sock *smc, bool is_smcd) 1783{ 1784 int rc; 1785 1786 /* create send buffer */ 1787 rc = __smc_buf_create(smc, is_smcd, false); 1788 if (rc) 1789 return rc; 1790 /* create rmb */ 1791 rc = __smc_buf_create(smc, is_smcd, true); 1792 if (rc) { 1793 mutex_lock(&smc->conn.lgr->sndbufs_lock); 1794 list_del(&smc->conn.sndbuf_desc->list); 1795 mutex_unlock(&smc->conn.lgr->sndbufs_lock); 1796 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); 1797 smc->conn.sndbuf_desc = NULL; 1798 } 1799 return rc; 1800} 1801 1802static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) 1803{ 1804 int i; 1805 1806 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { 1807 if (!test_and_set_bit(i, lgr->rtokens_used_mask)) 1808 return i; 1809 } 1810 return -ENOSPC; 1811} 1812 1813static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx, 1814 u32 rkey) 1815{ 1816 int i; 1817 1818 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1819 if (test_bit(i, lgr->rtokens_used_mask) && 1820 lgr->rtokens[i][lnk_idx].rkey == rkey) 1821 return i; 1822 } 1823 return -ENOENT; 1824} 1825 1826/* set rtoken for a new link to an existing rmb */ 1827void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new, 1828 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey) 1829{ 1830 int rtok_idx; 1831 1832 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known)); 1833 if (rtok_idx == -ENOENT) 1834 return; 1835 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey); 1836 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr); 1837} 1838 1839/* set rtoken for a new link whose link_id is given */ 1840void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id, 1841 __be64 nw_vaddr, __be32 nw_rkey) 1842{ 1843 u64 dma_addr = be64_to_cpu(nw_vaddr); 1844 u32 rkey = ntohl(nw_rkey); 1845 bool found = false; 1846 int link_idx; 1847 1848 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) { 1849 if (lgr->lnk[link_idx].link_id == link_id) { 1850 found = true; 1851 break; 1852 } 1853 } 1854 if (!found) 1855 return; 1856 lgr->rtokens[rtok_idx][link_idx].rkey = rkey; 1857 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr; 1858} 1859 1860/* add a new rtoken from peer */ 1861int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey) 1862{ 1863 struct smc_link_group *lgr = smc_get_lgr(lnk); 1864 u64 dma_addr = be64_to_cpu(nw_vaddr); 1865 u32 rkey = ntohl(nw_rkey); 1866 int i; 1867 1868 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1869 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 1870 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr && 1871 test_bit(i, lgr->rtokens_used_mask)) { 1872 /* already in list */ 1873 return i; 1874 } 1875 } 1876 i = smc_rmb_reserve_rtoken_idx(lgr); 1877 if (i < 0) 1878 return i; 1879 lgr->rtokens[i][lnk->link_idx].rkey = rkey; 1880 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr; 1881 return i; 1882} 1883 1884/* delete an rtoken from all links */ 1885int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey) 1886{ 1887 struct smc_link_group *lgr = smc_get_lgr(lnk); 1888 u32 rkey = ntohl(nw_rkey); 1889 int i, j; 1890 1891 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { 1892 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey && 1893 test_bit(i, lgr->rtokens_used_mask)) { 1894 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) { 1895 lgr->rtokens[i][j].rkey = 0; 1896 lgr->rtokens[i][j].dma_addr = 0; 1897 } 1898 clear_bit(i, lgr->rtokens_used_mask); 1899 return 0; 1900 } 1901 } 1902 return -ENOENT; 1903} 1904 1905/* save rkey and dma_addr received from peer during clc handshake */ 1906int smc_rmb_rtoken_handling(struct smc_connection *conn, 1907 struct smc_link *lnk, 1908 struct smc_clc_msg_accept_confirm *clc) 1909{ 1910 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr, 1911 clc->r0.rmb_rkey); 1912 if (conn->rtoken_idx < 0) 1913 return conn->rtoken_idx; 1914 return 0; 1915} 1916 1917static void smc_core_going_away(void) 1918{ 1919 struct smc_ib_device *smcibdev; 1920 struct smcd_dev *smcd; 1921 1922 mutex_lock(&smc_ib_devices.mutex); 1923 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) { 1924 int i; 1925 1926 for (i = 0; i < SMC_MAX_PORTS; i++) 1927 set_bit(i, smcibdev->ports_going_away); 1928 } 1929 mutex_unlock(&smc_ib_devices.mutex); 1930 1931 mutex_lock(&smcd_dev_list.mutex); 1932 list_for_each_entry(smcd, &smcd_dev_list.list, list) { 1933 smcd->going_away = 1; 1934 } 1935 mutex_unlock(&smcd_dev_list.mutex); 1936} 1937 1938/* Clean up all SMC link groups */ 1939static void smc_lgrs_shutdown(void) 1940{ 1941 struct smcd_dev *smcd; 1942 1943 smc_core_going_away(); 1944 1945 smc_smcr_terminate_all(NULL); 1946 1947 mutex_lock(&smcd_dev_list.mutex); 1948 list_for_each_entry(smcd, &smcd_dev_list.list, list) 1949 smc_smcd_terminate_all(smcd); 1950 mutex_unlock(&smcd_dev_list.mutex); 1951} 1952 1953static int smc_core_reboot_event(struct notifier_block *this, 1954 unsigned long event, void *ptr) 1955{ 1956 smc_lgrs_shutdown(); 1957 smc_ib_unregister_client(); 1958 return 0; 1959} 1960 1961static struct notifier_block smc_reboot_notifier = { 1962 .notifier_call = smc_core_reboot_event, 1963}; 1964 1965int __init smc_core_init(void) 1966{ 1967 return register_reboot_notifier(&smc_reboot_notifier); 1968} 1969 1970/* Called (from smc_exit) when module is removed */ 1971void smc_core_exit(void) 1972{ 1973 unregister_reboot_notifier(&smc_reboot_notifier); 1974 smc_lgrs_shutdown(); 1975} 1976