net/smc/smc_core.c

   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 <net/tcp.h>
  17 #include <net/sock.h>
  18 #include <rdma/ib_verbs.h>
  19 #include <rdma/ib_cache.h>
  20
  21 #include "smc.h"
  22 #include "smc_clc.h"
  23 #include "smc_core.h"
  24 #include "smc_ib.h"
  25 #include "smc_wr.h"
  26 #include "smc_llc.h"
  27 #include "smc_cdc.h"
  28 #include "smc_close.h"
  29 #include "smc_ism.h"
  30
  31 #define SMC_LGR_NUM_INCR                256
  32 #define SMC_LGR_FREE_DELAY_SERV         (600 * HZ)
  33 #define SMC_LGR_FREE_DELAY_CLNT         (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
  34 #define SMC_LGR_FREE_DELAY_FAST         (8 * HZ)
  35
  36 static struct smc_lgr_list smc_lgr_list = {     /* established link groups */
  37         .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
  38         .list = LIST_HEAD_INIT(smc_lgr_list.list),
  39         .num = 0,
  40 };
  41
  42 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
  43                          struct smc_buf_desc *buf_desc);
  44
  45 /* return head of link group list and its lock for a given link group */
  46 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
  47                                                   spinlock_t **lgr_lock)
  48 {
  49         if (lgr->is_smcd) {
  50                 *lgr_lock = &lgr->smcd->lgr_lock;
  51                 return &lgr->smcd->lgr_list;
  52         }
  53
  54         *lgr_lock = &smc_lgr_list.lock;
  55         return &smc_lgr_list.list;
  56 }
  57
  58 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
  59 {
  60         /* client link group creation always follows the server link group
  61          * creation. For client use a somewhat higher removal delay time,
  62          * otherwise there is a risk of out-of-sync link groups.
  63          */
  64         if (!lgr->freeing && !lgr->freefast) {
  65                 mod_delayed_work(system_wq, &lgr->free_work,
  66                                  (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
  67                                                 SMC_LGR_FREE_DELAY_CLNT :
  68                                                 SMC_LGR_FREE_DELAY_SERV);
  69         }
  70 }
  71
  72 void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
  73 {
  74         if (!lgr->freeing && !lgr->freefast) {
  75                 lgr->freefast = 1;
  76                 mod_delayed_work(system_wq, &lgr->free_work,
  77                                  SMC_LGR_FREE_DELAY_FAST);
  78         }
  79 }
  80
  81 /* Register connection's alert token in our lookup structure.
  82  * To use rbtrees we have to implement our own insert core.
  83  * Requires @conns_lock
  84  * @smc         connection to register
  85  * Returns 0 on success, != otherwise.
  86  */
  87 static void smc_lgr_add_alert_token(struct smc_connection *conn)
  88 {
  89         struct rb_node **link, *parent = NULL;
  90         u32 token = conn->alert_token_local;
  91
  92         link = &conn->lgr->conns_all.rb_node;
  93         while (*link) {
  94                 struct smc_connection *cur = rb_entry(*link,
  95                                         struct smc_connection, alert_node);
  96
  97                 parent = *link;
  98                 if (cur->alert_token_local > token)
  99                         link = &parent->rb_left;
 100                 else
 101                         link = &parent->rb_right;
 102         }
 103         /* Put the new node there */
 104         rb_link_node(&conn->alert_node, parent, link);
 105         rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
 106 }
 107
 108 /* Register connection in link group by assigning an alert token
 109  * registered in a search tree.
 110  * Requires @conns_lock
 111  * Note that '0' is a reserved value and not assigned.
 112  */
 113 static void smc_lgr_register_conn(struct smc_connection *conn)
 114 {
 115         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 116         static atomic_t nexttoken = ATOMIC_INIT(0);
 117
 118         /* find a new alert_token_local value not yet used by some connection
 119          * in this link group
 120          */
 121         sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
 122         while (!conn->alert_token_local) {
 123                 conn->alert_token_local = atomic_inc_return(&nexttoken);
 124                 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
 125                         conn->alert_token_local = 0;
 126         }
 127         smc_lgr_add_alert_token(conn);
 128         conn->lgr->conns_num++;
 129 }
 130
 131 /* Unregister connection and reset the alert token of the given connection<
 132  */
 133 static void __smc_lgr_unregister_conn(struct smc_connection *conn)
 134 {
 135         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 136         struct smc_link_group *lgr = conn->lgr;
 137
 138         rb_erase(&conn->alert_node, &lgr->conns_all);
 139         lgr->conns_num--;
 140         conn->alert_token_local = 0;
 141         sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
 142 }
 143
 144 /* Unregister connection from lgr
 145  */
 146 static void smc_lgr_unregister_conn(struct smc_connection *conn)
 147 {
 148         struct smc_link_group *lgr = conn->lgr;
 149
 150         if (!lgr)
 151                 return;
 152         write_lock_bh(&lgr->conns_lock);
 153         if (conn->alert_token_local) {
 154                 __smc_lgr_unregister_conn(conn);
 155         }
 156         write_unlock_bh(&lgr->conns_lock);
 157         conn->lgr = NULL;
 158 }
 159
 160 /* Send delete link, either as client to request the initiation
 161  * of the DELETE LINK sequence from server; or as server to
 162  * initiate the delete processing. See smc_llc_rx_delete_link().
 163  */
 164 static int smc_link_send_delete(struct smc_link *lnk)
 165 {
 166         if (lnk->state == SMC_LNK_ACTIVE &&
 167             !smc_llc_send_delete_link(lnk, SMC_LLC_REQ, true)) {
 168                 smc_llc_link_deleting(lnk);
 169                 return 0;
 170         }
 171         return -ENOTCONN;
 172 }
 173
 174 static void smc_lgr_free(struct smc_link_group *lgr);
 175
 176 static void smc_lgr_free_work(struct work_struct *work)
 177 {
 178         struct smc_link_group *lgr = container_of(to_delayed_work(work),
 179                                                   struct smc_link_group,
 180                                                   free_work);
 181         spinlock_t *lgr_lock;
 182         struct smc_link *lnk;
 183         bool conns;
 184
 185         smc_lgr_list_head(lgr, &lgr_lock);
 186         spin_lock_bh(lgr_lock);
 187         if (lgr->freeing) {
 188                 spin_unlock_bh(lgr_lock);
 189                 return;
 190         }
 191         read_lock_bh(&lgr->conns_lock);
 192         conns = RB_EMPTY_ROOT(&lgr->conns_all);
 193         read_unlock_bh(&lgr->conns_lock);
 194         if (!conns) { /* number of lgr connections is no longer zero */
 195                 spin_unlock_bh(lgr_lock);
 196                 return;
 197         }
 198         list_del_init(&lgr->list); /* remove from smc_lgr_list */
 199
 200         lnk = &lgr->lnk[SMC_SINGLE_LINK];
 201         if (!lgr->is_smcd && !lgr->terminating) {
 202                 /* try to send del link msg, on error free lgr immediately */
 203                 if (lnk->state == SMC_LNK_ACTIVE &&
 204                     !smc_link_send_delete(lnk)) {
 205                         /* reschedule in case we never receive a response */
 206                         smc_lgr_schedule_free_work(lgr);
 207                         spin_unlock_bh(lgr_lock);
 208                         return;
 209                 }
 210         }
 211         lgr->freeing = 1; /* this instance does the freeing, no new schedule */
 212         spin_unlock_bh(lgr_lock);
 213         cancel_delayed_work(&lgr->free_work);
 214
 215         if (!lgr->is_smcd && lnk->state != SMC_LNK_INACTIVE)
 216                 smc_llc_link_inactive(lnk);
 217         if (lgr->is_smcd)
 218                 smc_ism_signal_shutdown(lgr);
 219         smc_lgr_free(lgr);
 220 }
 221
 222 static void smc_lgr_terminate_work(struct work_struct *work)
 223 {
 224         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
 225                                                   terminate_work);
 226
 227         smc_lgr_terminate(lgr);
 228 }
 229
 230 /* create a new SMC link group */
 231 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 232 {
 233         struct smc_link_group *lgr;
 234         struct list_head *lgr_list;
 235         struct smc_link *lnk;
 236         spinlock_t *lgr_lock;
 237         u8 rndvec[3];
 238         int rc = 0;
 239         int i;
 240
 241         if (ini->is_smcd && ini->vlan_id) {
 242                 if (smc_ism_get_vlan(ini->ism_dev, ini->vlan_id)) {
 243                         rc = SMC_CLC_DECL_ISMVLANERR;
 244                         goto out;
 245                 }
 246         }
 247
 248         lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
 249         if (!lgr) {
 250                 rc = SMC_CLC_DECL_MEM;
 251                 goto ism_put_vlan;
 252         }
 253         lgr->is_smcd = ini->is_smcd;
 254         lgr->sync_err = 0;
 255         lgr->terminating = 0;
 256         lgr->freefast = 0;
 257         lgr->freeing = 0;
 258         lgr->vlan_id = ini->vlan_id;
 259         rwlock_init(&lgr->sndbufs_lock);
 260         rwlock_init(&lgr->rmbs_lock);
 261         rwlock_init(&lgr->conns_lock);
 262         for (i = 0; i < SMC_RMBE_SIZES; i++) {
 263                 INIT_LIST_HEAD(&lgr->sndbufs[i]);
 264                 INIT_LIST_HEAD(&lgr->rmbs[i]);
 265         }
 266         smc_lgr_list.num += SMC_LGR_NUM_INCR;
 267         memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
 268         INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
 269         INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
 270         lgr->conns_all = RB_ROOT;
 271         if (ini->is_smcd) {
 272                 /* SMC-D specific settings */
 273                 get_device(&ini->ism_dev->dev);
 274                 lgr->peer_gid = ini->ism_gid;
 275                 lgr->smcd = ini->ism_dev;
 276                 lgr_list = &ini->ism_dev->lgr_list;
 277                 lgr_lock = &lgr->smcd->lgr_lock;
 278                 lgr->peer_shutdown = 0;
 279         } else {
 280                 /* SMC-R specific settings */
 281                 get_device(&ini->ib_dev->ibdev->dev);
 282                 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
 283                 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
 284                        SMC_SYSTEMID_LEN);
 285
 286                 lnk = &lgr->lnk[SMC_SINGLE_LINK];
 287                 /* initialize link */
 288                 lnk->state = SMC_LNK_ACTIVATING;
 289                 lnk->link_id = SMC_SINGLE_LINK;
 290                 lnk->smcibdev = ini->ib_dev;
 291                 lnk->ibport = ini->ib_port;
 292                 lgr_list = &smc_lgr_list.list;
 293                 lgr_lock = &smc_lgr_list.lock;
 294                 lnk->path_mtu =
 295                         ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
 296                 if (!ini->ib_dev->initialized)
 297                         smc_ib_setup_per_ibdev(ini->ib_dev);
 298                 get_random_bytes(rndvec, sizeof(rndvec));
 299                 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
 300                         (rndvec[2] << 16);
 301                 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
 302                                           ini->vlan_id, lnk->gid,
 303                                           &lnk->sgid_index);
 304                 if (rc)
 305                         goto free_lgr;
 306                 rc = smc_llc_link_init(lnk);
 307                 if (rc)
 308                         goto free_lgr;
 309                 rc = smc_wr_alloc_link_mem(lnk);
 310                 if (rc)
 311                         goto clear_llc_lnk;
 312                 rc = smc_ib_create_protection_domain(lnk);
 313                 if (rc)
 314                         goto free_link_mem;
 315                 rc = smc_ib_create_queue_pair(lnk);
 316                 if (rc)
 317                         goto dealloc_pd;
 318                 rc = smc_wr_create_link(lnk);
 319                 if (rc)
 320                         goto destroy_qp;
 321         }
 322         smc->conn.lgr = lgr;
 323         spin_lock_bh(lgr_lock);
 324         list_add(&lgr->list, lgr_list);
 325         spin_unlock_bh(lgr_lock);
 326         return 0;
 327
 328 destroy_qp:
 329         smc_ib_destroy_queue_pair(lnk);
 330 dealloc_pd:
 331         smc_ib_dealloc_protection_domain(lnk);
 332 free_link_mem:
 333         smc_wr_free_link_mem(lnk);
 334 clear_llc_lnk:
 335         smc_llc_link_clear(lnk);
 336 free_lgr:
 337         kfree(lgr);
 338 ism_put_vlan:
 339         if (ini->is_smcd && ini->vlan_id)
 340                 smc_ism_put_vlan(ini->ism_dev, ini->vlan_id);
 341 out:
 342         if (rc < 0) {
 343                 if (rc == -ENOMEM)
 344                         rc = SMC_CLC_DECL_MEM;
 345                 else
 346                         rc = SMC_CLC_DECL_INTERR;
 347         }
 348         return rc;
 349 }
 350
 351 static void smc_buf_unuse(struct smc_connection *conn,
 352                           struct smc_link_group *lgr)
 353 {
 354         if (conn->sndbuf_desc)
 355                 conn->sndbuf_desc->used = 0;
 356         if (conn->rmb_desc) {
 357                 if (!conn->rmb_desc->regerr) {
 358                         if (!lgr->is_smcd && !list_empty(&lgr->list)) {
 359                                 /* unregister rmb with peer */
 360                                 smc_llc_do_delete_rkey(
 361                                                 &lgr->lnk[SMC_SINGLE_LINK],
 362                                                 conn->rmb_desc);
 363                         }
 364                         conn->rmb_desc->used = 0;
 365                 } else {
 366                         /* buf registration failed, reuse not possible */
 367                         write_lock_bh(&lgr->rmbs_lock);
 368                         list_del(&conn->rmb_desc->list);
 369                         write_unlock_bh(&lgr->rmbs_lock);
 370
 371                         smc_buf_free(lgr, true, conn->rmb_desc);
 372                 }
 373         }
 374 }
 375
 376 /* remove a finished connection from its link group */
 377 void smc_conn_free(struct smc_connection *conn)
 378 {
 379         struct smc_link_group *lgr = conn->lgr;
 380
 381         if (!lgr)
 382                 return;
 383         if (lgr->is_smcd) {
 384                 smc_ism_unset_conn(conn);
 385                 tasklet_kill(&conn->rx_tsklet);
 386         } else {
 387                 smc_cdc_tx_dismiss_slots(conn);
 388         }
 389         if (!list_empty(&lgr->list)) {
 390                 smc_lgr_unregister_conn(conn);
 391                 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
 392         }
 393
 394         if (!lgr->conns_num)
 395                 smc_lgr_schedule_free_work(lgr);
 396 }
 397
 398 static void smc_link_clear(struct smc_link *lnk)
 399 {
 400         lnk->peer_qpn = 0;
 401         smc_llc_link_clear(lnk);
 402         smc_ib_modify_qp_reset(lnk);
 403         smc_wr_free_link(lnk);
 404         smc_ib_destroy_queue_pair(lnk);
 405         smc_ib_dealloc_protection_domain(lnk);
 406         smc_wr_free_link_mem(lnk);
 407 }
 408
 409 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
 410                           struct smc_buf_desc *buf_desc)
 411 {
 412         struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
 413
 414         if (is_rmb) {
 415                 if (buf_desc->mr_rx[SMC_SINGLE_LINK])
 416                         smc_ib_put_memory_region(
 417                                         buf_desc->mr_rx[SMC_SINGLE_LINK]);
 418                 smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc,
 419                                     DMA_FROM_DEVICE);
 420         } else {
 421                 smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc,
 422                                     DMA_TO_DEVICE);
 423         }
 424         sg_free_table(&buf_desc->sgt[SMC_SINGLE_LINK]);
 425         if (buf_desc->pages)
 426                 __free_pages(buf_desc->pages, buf_desc->order);
 427         kfree(buf_desc);
 428 }
 429
 430 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
 431                           struct smc_buf_desc *buf_desc)
 432 {
 433         if (is_dmb) {
 434                 /* restore original buf len */
 435                 buf_desc->len += sizeof(struct smcd_cdc_msg);
 436                 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
 437         } else {
 438                 kfree(buf_desc->cpu_addr);
 439         }
 440         kfree(buf_desc);
 441 }
 442
 443 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
 444                          struct smc_buf_desc *buf_desc)
 445 {
 446         if (lgr->is_smcd)
 447                 smcd_buf_free(lgr, is_rmb, buf_desc);
 448         else
 449                 smcr_buf_free(lgr, is_rmb, buf_desc);
 450 }
 451
 452 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
 453 {
 454         struct smc_buf_desc *buf_desc, *bf_desc;
 455         struct list_head *buf_list;
 456         int i;
 457
 458         for (i = 0; i < SMC_RMBE_SIZES; i++) {
 459                 if (is_rmb)
 460                         buf_list = &lgr->rmbs[i];
 461                 else
 462                         buf_list = &lgr->sndbufs[i];
 463                 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
 464                                          list) {
 465                         list_del(&buf_desc->list);
 466                         smc_buf_free(lgr, is_rmb, buf_desc);
 467                 }
 468         }
 469 }
 470
 471 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
 472 {
 473         /* free send buffers */
 474         __smc_lgr_free_bufs(lgr, false);
 475         /* free rmbs */
 476         __smc_lgr_free_bufs(lgr, true);
 477 }
 478
 479 /* remove a link group */
 480 static void smc_lgr_free(struct smc_link_group *lgr)
 481 {
 482         smc_lgr_free_bufs(lgr);
 483         if (lgr->is_smcd) {
 484                 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
 485                 put_device(&lgr->smcd->dev);
 486         } else {
 487                 smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]);
 488                 put_device(&lgr->lnk[SMC_SINGLE_LINK].smcibdev->ibdev->dev);
 489         }
 490         kfree(lgr);
 491 }
 492
 493 void smc_lgr_forget(struct smc_link_group *lgr)
 494 {
 495         struct list_head *lgr_list;
 496         spinlock_t *lgr_lock;
 497
 498         lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
 499         spin_lock_bh(lgr_lock);
 500         /* do not use this link group for new connections */
 501         if (!list_empty(lgr_list))
 502                 list_del_init(lgr_list);
 503         spin_unlock_bh(lgr_lock);
 504 }
 505
 506 static void smc_sk_wake_ups(struct smc_sock *smc)
 507 {
 508         smc->sk.sk_write_space(&smc->sk);
 509         smc->sk.sk_data_ready(&smc->sk);
 510         smc->sk.sk_state_change(&smc->sk);
 511 }
 512
 513 /* kill a connection */
 514 static void smc_conn_kill(struct smc_connection *conn)
 515 {
 516         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 517
 518         if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
 519                 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
 520         else
 521                 smc_close_abort(conn);
 522         conn->killed = 1;
 523         smc->sk.sk_err = ECONNABORTED;
 524         smc_sk_wake_ups(smc);
 525         if (conn->lgr->is_smcd)
 526                 tasklet_kill(&conn->rx_tsklet);
 527         smc_lgr_unregister_conn(conn);
 528         smc_close_active_abort(smc);
 529 }
 530
 531 /* terminate link group */
 532 static void __smc_lgr_terminate(struct smc_link_group *lgr)
 533 {
 534         struct smc_connection *conn;
 535         struct smc_sock *smc;
 536         struct rb_node *node;
 537
 538         if (lgr->terminating)
 539                 return; /* lgr already terminating */
 540         lgr->terminating = 1;
 541         if (!lgr->is_smcd)
 542                 smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);
 543
 544         /* kill remaining link group connections */
 545         read_lock_bh(&lgr->conns_lock);
 546         node = rb_first(&lgr->conns_all);
 547         while (node) {
 548                 read_unlock_bh(&lgr->conns_lock);
 549                 conn = rb_entry(node, struct smc_connection, alert_node);
 550                 smc = container_of(conn, struct smc_sock, conn);
 551                 sock_hold(&smc->sk); /* sock_put below */
 552                 lock_sock(&smc->sk);
 553                 smc_conn_kill(conn);
 554                 release_sock(&smc->sk);
 555                 sock_put(&smc->sk); /* sock_hold above */
 556                 read_lock_bh(&lgr->conns_lock);
 557                 node = rb_first(&lgr->conns_all);
 558         }
 559         read_unlock_bh(&lgr->conns_lock);
 560         if (!lgr->is_smcd)
 561                 wake_up(&lgr->lnk[SMC_SINGLE_LINK].wr_reg_wait);
 562         smc_lgr_schedule_free_work_fast(lgr);
 563 }
 564
 565 /* unlink and terminate link group */
 566 void smc_lgr_terminate(struct smc_link_group *lgr)
 567 {
 568         spinlock_t *lgr_lock;
 569
 570         smc_lgr_list_head(lgr, &lgr_lock);
 571         spin_lock_bh(lgr_lock);
 572         if (lgr->terminating) {
 573                 spin_unlock_bh(lgr_lock);
 574                 return; /* lgr already terminating */
 575         }
 576         list_del_init(&lgr->list);
 577         spin_unlock_bh(lgr_lock);
 578         __smc_lgr_terminate(lgr);
 579 }
 580
 581 /* Called when IB port is terminated */
 582 void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport)
 583 {
 584         struct smc_link_group *lgr, *l;
 585         LIST_HEAD(lgr_free_list);
 586
 587         spin_lock_bh(&smc_lgr_list.lock);
 588         list_for_each_entry_safe(lgr, l, &smc_lgr_list.list, list) {
 589                 if (!lgr->is_smcd &&
 590                     lgr->lnk[SMC_SINGLE_LINK].smcibdev == smcibdev &&
 591                     lgr->lnk[SMC_SINGLE_LINK].ibport == ibport)
 592                         list_move(&lgr->list, &lgr_free_list);
 593         }
 594         spin_unlock_bh(&smc_lgr_list.lock);
 595
 596         list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
 597                 list_del_init(&lgr->list);
 598                 __smc_lgr_terminate(lgr);
 599         }
 600 }
 601
 602 /* Called when SMC-D device is terminated or peer is lost */
 603 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
 604 {
 605         struct smc_link_group *lgr, *l;
 606         LIST_HEAD(lgr_free_list);
 607
 608         /* run common cleanup function and build free list */
 609         spin_lock_bh(&dev->lgr_lock);
 610         list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
 611                 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
 612                     (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
 613                         if (peer_gid) /* peer triggered termination */
 614                                 lgr->peer_shutdown = 1;
 615                         list_move(&lgr->list, &lgr_free_list);
 616                 }
 617         }
 618         spin_unlock_bh(&dev->lgr_lock);
 619
 620         /* cancel the regular free workers and actually free lgrs */
 621         list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
 622                 list_del_init(&lgr->list);
 623                 schedule_work(&lgr->terminate_work);
 624         }
 625 }
 626
 627 /* Determine vlan of internal TCP socket.
 628  * @vlan_id: address to store the determined vlan id into
 629  */
 630 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
 631 {
 632         struct dst_entry *dst = sk_dst_get(clcsock->sk);
 633         struct net_device *ndev;
 634         int i, nest_lvl, rc = 0;
 635
 636         ini->vlan_id = 0;
 637         if (!dst) {
 638                 rc = -ENOTCONN;
 639                 goto out;
 640         }
 641         if (!dst->dev) {
 642                 rc = -ENODEV;
 643                 goto out_rel;
 644         }
 645
 646         ndev = dst->dev;
 647         if (is_vlan_dev(ndev)) {
 648                 ini->vlan_id = vlan_dev_vlan_id(ndev);
 649                 goto out_rel;
 650         }
 651
 652         rtnl_lock();
 653         nest_lvl = ndev->lower_level;
 654         for (i = 0; i < nest_lvl; i++) {
 655                 struct list_head *lower = &ndev->adj_list.lower;
 656
 657                 if (list_empty(lower))
 658                         break;
 659                 lower = lower->next;
 660                 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
 661                 if (is_vlan_dev(ndev)) {
 662                         ini->vlan_id = vlan_dev_vlan_id(ndev);
 663                         break;
 664                 }
 665         }
 666         rtnl_unlock();
 667
 668 out_rel:
 669         dst_release(dst);
 670 out:
 671         return rc;
 672 }
 673
 674 static bool smcr_lgr_match(struct smc_link_group *lgr,
 675                            struct smc_clc_msg_local *lcl,
 676                            enum smc_lgr_role role, u32 clcqpn)
 677 {
 678         return !memcmp(lgr->peer_systemid, lcl->id_for_peer,
 679                        SMC_SYSTEMID_LEN) &&
 680                 !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid,
 681                         SMC_GID_SIZE) &&
 682                 !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac,
 683                         sizeof(lcl->mac)) &&
 684                 lgr->role == role &&
 685                 (lgr->role == SMC_SERV ||
 686                  lgr->lnk[SMC_SINGLE_LINK].peer_qpn == clcqpn);
 687 }
 688
 689 static bool smcd_lgr_match(struct smc_link_group *lgr,
 690                            struct smcd_dev *smcismdev, u64 peer_gid)
 691 {
 692         return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
 693 }
 694
 695 /* create a new SMC connection (and a new link group if necessary) */
 696 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
 697 {
 698         struct smc_connection *conn = &smc->conn;
 699         struct list_head *lgr_list;
 700         struct smc_link_group *lgr;
 701         enum smc_lgr_role role;
 702         spinlock_t *lgr_lock;
 703         int rc = 0;
 704
 705         lgr_list = ini->is_smcd ? &ini->ism_dev->lgr_list : &smc_lgr_list.list;
 706         lgr_lock = ini->is_smcd ? &ini->ism_dev->lgr_lock : &smc_lgr_list.lock;
 707         ini->cln_first_contact = SMC_FIRST_CONTACT;
 708         role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
 709         if (role == SMC_CLNT && ini->srv_first_contact)
 710                 /* create new link group as well */
 711                 goto create;
 712
 713         /* determine if an existing link group can be reused */
 714         spin_lock_bh(lgr_lock);
 715         list_for_each_entry(lgr, lgr_list, list) {
 716                 write_lock_bh(&lgr->conns_lock);
 717                 if ((ini->is_smcd ?
 718                      smcd_lgr_match(lgr, ini->ism_dev, ini->ism_gid) :
 719                      smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
 720                     !lgr->sync_err &&
 721                     lgr->vlan_id == ini->vlan_id &&
 722                     (role == SMC_CLNT ||
 723                      lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
 724                         /* link group found */
 725                         ini->cln_first_contact = SMC_REUSE_CONTACT;
 726                         conn->lgr = lgr;
 727                         smc_lgr_register_conn(conn); /* add smc conn to lgr */
 728                         if (delayed_work_pending(&lgr->free_work))
 729                                 cancel_delayed_work(&lgr->free_work);
 730                         write_unlock_bh(&lgr->conns_lock);
 731                         break;
 732                 }
 733                 write_unlock_bh(&lgr->conns_lock);
 734         }
 735         spin_unlock_bh(lgr_lock);
 736
 737         if (role == SMC_CLNT && !ini->srv_first_contact &&
 738             ini->cln_first_contact == SMC_FIRST_CONTACT) {
 739                 /* Server reuses a link group, but Client wants to start
 740                  * a new one
 741                  * send out_of_sync decline, reason synchr. error
 742                  */
 743                 return SMC_CLC_DECL_SYNCERR;
 744         }
 745
 746 create:
 747         if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
 748                 rc = smc_lgr_create(smc, ini);
 749                 if (rc)
 750                         goto out;
 751                 lgr = conn->lgr;
 752                 write_lock_bh(&lgr->conns_lock);
 753                 smc_lgr_register_conn(conn); /* add smc conn to lgr */
 754                 write_unlock_bh(&lgr->conns_lock);
 755         }
 756         conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
 757         conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
 758         conn->urg_state = SMC_URG_READ;
 759         if (ini->is_smcd) {
 760                 conn->rx_off = sizeof(struct smcd_cdc_msg);
 761                 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
 762         }
 763 #ifndef KERNEL_HAS_ATOMIC64
 764         spin_lock_init(&conn->acurs_lock);
 765 #endif
 766
 767 out:
 768         return rc;
 769 }
 770
 771 /* convert the RMB size into the compressed notation - minimum 16K.
 772  * In contrast to plain ilog2, this rounds towards the next power of 2,
 773  * so the socket application gets at least its desired sndbuf / rcvbuf size.
 774  */
 775 static u8 smc_compress_bufsize(int size)
 776 {
 777         u8 compressed;
 778
 779         if (size <= SMC_BUF_MIN_SIZE)
 780                 return 0;
 781
 782         size = (size - 1) >> 14;
 783         compressed = ilog2(size) + 1;
 784         if (compressed >= SMC_RMBE_SIZES)
 785                 compressed = SMC_RMBE_SIZES - 1;
 786         return compressed;
 787 }
 788
 789 /* convert the RMB size from compressed notation into integer */
 790 int smc_uncompress_bufsize(u8 compressed)
 791 {
 792         u32 size;
 793
 794         size = 0x00000001 << (((int)compressed) + 14);
 795         return (int)size;
 796 }
 797
 798 /* try to reuse a sndbuf or rmb description slot for a certain
 799  * buffer size; if not available, return NULL
 800  */
 801 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
 802                                              rwlock_t *lock,
 803                                              struct list_head *buf_list)
 804 {
 805         struct smc_buf_desc *buf_slot;
 806
 807         read_lock_bh(lock);
 808         list_for_each_entry(buf_slot, buf_list, list) {
 809                 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
 810                         read_unlock_bh(lock);
 811                         return buf_slot;
 812                 }
 813         }
 814         read_unlock_bh(lock);
 815         return NULL;
 816 }
 817
 818 /* one of the conditions for announcing a receiver's current window size is
 819  * that it "results in a minimum increase in the window size of 10% of the
 820  * receive buffer space" [RFC7609]
 821  */
 822 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
 823 {
 824         return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
 825 }
 826
 827 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
 828                                                 bool is_rmb, int bufsize)
 829 {
 830         struct smc_buf_desc *buf_desc;
 831         struct smc_link *lnk;
 832         int rc;
 833
 834         /* try to alloc a new buffer */
 835         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
 836         if (!buf_desc)
 837                 return ERR_PTR(-ENOMEM);
 838
 839         buf_desc->order = get_order(bufsize);
 840         buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
 841                                       __GFP_NOMEMALLOC | __GFP_COMP |
 842                                       __GFP_NORETRY | __GFP_ZERO,
 843                                       buf_desc->order);
 844         if (!buf_desc->pages) {
 845                 kfree(buf_desc);
 846                 return ERR_PTR(-EAGAIN);
 847         }
 848         buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
 849
 850         /* build the sg table from the pages */
 851         lnk = &lgr->lnk[SMC_SINGLE_LINK];
 852         rc = sg_alloc_table(&buf_desc->sgt[SMC_SINGLE_LINK], 1,
 853                             GFP_KERNEL);
 854         if (rc) {
 855                 smc_buf_free(lgr, is_rmb, buf_desc);
 856                 return ERR_PTR(rc);
 857         }
 858         sg_set_buf(buf_desc->sgt[SMC_SINGLE_LINK].sgl,
 859                    buf_desc->cpu_addr, bufsize);
 860
 861         /* map sg table to DMA address */
 862         rc = smc_ib_buf_map_sg(lnk->smcibdev, buf_desc,
 863                                is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
 864         /* SMC protocol depends on mapping to one DMA address only */
 865         if (rc != 1)  {
 866                 smc_buf_free(lgr, is_rmb, buf_desc);
 867                 return ERR_PTR(-EAGAIN);
 868         }
 869
 870         /* create a new memory region for the RMB */
 871         if (is_rmb) {
 872                 rc = smc_ib_get_memory_region(lnk->roce_pd,
 873                                               IB_ACCESS_REMOTE_WRITE |
 874                                               IB_ACCESS_LOCAL_WRITE,
 875                                               buf_desc);
 876                 if (rc) {
 877                         smc_buf_free(lgr, is_rmb, buf_desc);
 878                         return ERR_PTR(rc);
 879                 }
 880         }
 881
 882         buf_desc->len = bufsize;
 883         return buf_desc;
 884 }
 885
 886 #define SMCD_DMBE_SIZES         7 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
 887
 888 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
 889                                                 bool is_dmb, int bufsize)
 890 {
 891         struct smc_buf_desc *buf_desc;
 892         int rc;
 893
 894         if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
 895                 return ERR_PTR(-EAGAIN);
 896
 897         /* try to alloc a new DMB */
 898         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
 899         if (!buf_desc)
 900                 return ERR_PTR(-ENOMEM);
 901         if (is_dmb) {
 902                 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
 903                 if (rc) {
 904                         kfree(buf_desc);
 905                         return ERR_PTR(-EAGAIN);
 906                 }
 907                 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
 908                 /* CDC header stored in buf. So, pretend it was smaller */
 909                 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
 910         } else {
 911                 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
 912                                              __GFP_NOWARN | __GFP_NORETRY |
 913                                              __GFP_NOMEMALLOC);
 914                 if (!buf_desc->cpu_addr) {
 915                         kfree(buf_desc);
 916                         return ERR_PTR(-EAGAIN);
 917                 }
 918                 buf_desc->len = bufsize;
 919         }
 920         return buf_desc;
 921 }
 922
 923 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
 924 {
 925         struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
 926         struct smc_connection *conn = &smc->conn;
 927         struct smc_link_group *lgr = conn->lgr;
 928         struct list_head *buf_list;
 929         int bufsize, bufsize_short;
 930         int sk_buf_size;
 931         rwlock_t *lock;
 932
 933         if (is_rmb)
 934                 /* use socket recv buffer size (w/o overhead) as start value */
 935                 sk_buf_size = smc->sk.sk_rcvbuf / 2;
 936         else
 937                 /* use socket send buffer size (w/o overhead) as start value */
 938                 sk_buf_size = smc->sk.sk_sndbuf / 2;
 939
 940         for (bufsize_short = smc_compress_bufsize(sk_buf_size);
 941              bufsize_short >= 0; bufsize_short--) {
 942
 943                 if (is_rmb) {
 944                         lock = &lgr->rmbs_lock;
 945                         buf_list = &lgr->rmbs[bufsize_short];
 946                 } else {
 947                         lock = &lgr->sndbufs_lock;
 948                         buf_list = &lgr->sndbufs[bufsize_short];
 949                 }
 950                 bufsize = smc_uncompress_bufsize(bufsize_short);
 951                 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
 952                         continue;
 953
 954                 /* check for reusable slot in the link group */
 955                 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
 956                 if (buf_desc) {
 957                         memset(buf_desc->cpu_addr, 0, bufsize);
 958                         break; /* found reusable slot */
 959                 }
 960
 961                 if (is_smcd)
 962                         buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
 963                 else
 964                         buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
 965
 966                 if (PTR_ERR(buf_desc) == -ENOMEM)
 967                         break;
 968                 if (IS_ERR(buf_desc))
 969                         continue;
 970
 971                 buf_desc->used = 1;
 972                 write_lock_bh(lock);
 973                 list_add(&buf_desc->list, buf_list);
 974                 write_unlock_bh(lock);
 975                 break; /* found */
 976         }
 977
 978         if (IS_ERR(buf_desc))
 979                 return -ENOMEM;
 980
 981         if (is_rmb) {
 982                 conn->rmb_desc = buf_desc;
 983                 conn->rmbe_size_short = bufsize_short;
 984                 smc->sk.sk_rcvbuf = bufsize * 2;
 985                 atomic_set(&conn->bytes_to_rcv, 0);
 986                 conn->rmbe_update_limit =
 987                         smc_rmb_wnd_update_limit(buf_desc->len);
 988                 if (is_smcd)
 989                         smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
 990         } else {
 991                 conn->sndbuf_desc = buf_desc;
 992                 smc->sk.sk_sndbuf = bufsize * 2;
 993                 atomic_set(&conn->sndbuf_space, bufsize);
 994         }
 995         return 0;
 996 }
 997
 998 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
 999 {
1000         struct smc_link_group *lgr = conn->lgr;
1001
1002         if (!conn->lgr || conn->lgr->is_smcd)
1003                 return;
1004         smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
1005                                conn->sndbuf_desc, DMA_TO_DEVICE);
1006 }
1007
1008 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
1009 {
1010         struct smc_link_group *lgr = conn->lgr;
1011
1012         if (!conn->lgr || conn->lgr->is_smcd)
1013                 return;
1014         smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
1015                                   conn->sndbuf_desc, DMA_TO_DEVICE);
1016 }
1017
1018 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
1019 {
1020         struct smc_link_group *lgr = conn->lgr;
1021
1022         if (!conn->lgr || conn->lgr->is_smcd)
1023                 return;
1024         smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
1025                                conn->rmb_desc, DMA_FROM_DEVICE);
1026 }
1027
1028 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
1029 {
1030         struct smc_link_group *lgr = conn->lgr;
1031
1032         if (!conn->lgr || conn->lgr->is_smcd)
1033                 return;
1034         smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
1035                                   conn->rmb_desc, DMA_FROM_DEVICE);
1036 }
1037
1038 /* create the send and receive buffer for an SMC socket;
1039  * receive buffers are called RMBs;
1040  * (even though the SMC protocol allows more than one RMB-element per RMB,
1041  * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
1042  * extra RMB for every connection in a link group
1043  */
1044 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
1045 {
1046         int rc;
1047
1048         /* create send buffer */
1049         rc = __smc_buf_create(smc, is_smcd, false);
1050         if (rc)
1051                 return rc;
1052         /* create rmb */
1053         rc = __smc_buf_create(smc, is_smcd, true);
1054         if (rc)
1055                 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
1056         return rc;
1057 }
1058
1059 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
1060 {
1061         int i;
1062
1063         for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
1064                 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
1065                         return i;
1066         }
1067         return -ENOSPC;
1068 }
1069
1070 /* add a new rtoken from peer */
1071 int smc_rtoken_add(struct smc_link_group *lgr, __be64 nw_vaddr, __be32 nw_rkey)
1072 {
1073         u64 dma_addr = be64_to_cpu(nw_vaddr);
1074         u32 rkey = ntohl(nw_rkey);
1075         int i;
1076
1077         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1078                 if ((lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey) &&
1079                     (lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr == dma_addr) &&
1080                     test_bit(i, lgr->rtokens_used_mask)) {
1081                         /* already in list */
1082                         return i;
1083                 }
1084         }
1085         i = smc_rmb_reserve_rtoken_idx(lgr);
1086         if (i < 0)
1087                 return i;
1088         lgr->rtokens[i][SMC_SINGLE_LINK].rkey = rkey;
1089         lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr = dma_addr;
1090         return i;
1091 }
1092
1093 /* delete an rtoken */
1094 int smc_rtoken_delete(struct smc_link_group *lgr, __be32 nw_rkey)
1095 {
1096         u32 rkey = ntohl(nw_rkey);
1097         int i;
1098
1099         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1100                 if (lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey &&
1101                     test_bit(i, lgr->rtokens_used_mask)) {
1102                         lgr->rtokens[i][SMC_SINGLE_LINK].rkey = 0;
1103                         lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr = 0;
1104
1105                         clear_bit(i, lgr->rtokens_used_mask);
1106                         return 0;
1107                 }
1108         }
1109         return -ENOENT;
1110 }
1111
1112 /* save rkey and dma_addr received from peer during clc handshake */
1113 int smc_rmb_rtoken_handling(struct smc_connection *conn,
1114                             struct smc_clc_msg_accept_confirm *clc)
1115 {
1116         conn->rtoken_idx = smc_rtoken_add(conn->lgr, clc->rmb_dma_addr,
1117                                           clc->rmb_rkey);
1118         if (conn->rtoken_idx < 0)
1119                 return conn->rtoken_idx;
1120         return 0;
1121 }
1122
1123 static void smc_core_going_away(void)
1124 {
1125         struct smc_ib_device *smcibdev;
1126         struct smcd_dev *smcd;
1127
1128         spin_lock(&smc_ib_devices.lock);
1129         list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
1130                 int i;
1131
1132                 for (i = 0; i < SMC_MAX_PORTS; i++)
1133                         set_bit(i, smcibdev->ports_going_away);
1134         }
1135         spin_unlock(&smc_ib_devices.lock);
1136
1137         spin_lock(&smcd_dev_list.lock);
1138         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1139                 smcd->going_away = 1;
1140         }
1141         spin_unlock(&smcd_dev_list.lock);
1142 }
1143
1144 /* Called (from smc_exit) when module is removed */
1145 void smc_core_exit(void)
1146 {
1147         struct smc_link_group *lgr, *lg;
1148         LIST_HEAD(lgr_freeing_list);
1149         struct smcd_dev *smcd;
1150
1151         smc_core_going_away();
1152
1153         spin_lock_bh(&smc_lgr_list.lock);
1154         list_splice_init(&smc_lgr_list.list, &lgr_freeing_list);
1155         spin_unlock_bh(&smc_lgr_list.lock);
1156
1157         spin_lock(&smcd_dev_list.lock);
1158         list_for_each_entry(smcd, &smcd_dev_list.list, list)
1159                 list_splice_init(&smcd->lgr_list, &lgr_freeing_list);
1160         spin_unlock(&smcd_dev_list.lock);
1161
1162         list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
1163                 list_del_init(&lgr->list);
1164                 if (!lgr->is_smcd) {
1165                         struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
1166
1167                         if (lnk->state == SMC_LNK_ACTIVE)
1168                                 smc_llc_send_delete_link(lnk, SMC_LLC_REQ,
1169                                                          false);
1170                         smc_llc_link_inactive(lnk);
1171                 }
1172                 cancel_delayed_work_sync(&lgr->free_work);
1173                 if (lgr->is_smcd)
1174                         smc_ism_signal_shutdown(lgr);
1175                 smc_lgr_free(lgr); /* free link group */
1176         }
1177 }