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 <linux/wait.h>
  17 #include <linux/reboot.h>
  18 #include <linux/mutex.h>
  19 #include <linux/list.h>
  20 #include <linux/smc.h>
  21 #include <net/tcp.h>
  22 #include <net/sock.h>
  23 #include <rdma/ib_verbs.h>
  24 #include <rdma/ib_cache.h>
  25
  26 #include "smc.h"
  27 #include "smc_clc.h"
  28 #include "smc_core.h"
  29 #include "smc_ib.h"
  30 #include "smc_wr.h"
  31 #include "smc_llc.h"
  32 #include "smc_cdc.h"
  33 #include "smc_close.h"
  34 #include "smc_ism.h"
  35 #include "smc_netlink.h"
  36 #include "smc_stats.h"
  37
  38 #define SMC_LGR_NUM_INCR                256
  39 #define SMC_LGR_FREE_DELAY_SERV         (600 * HZ)
  40 #define SMC_LGR_FREE_DELAY_CLNT         (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
  41
  42 struct smc_lgr_list smc_lgr_list = {    /* established link groups */
  43         .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
  44         .list = LIST_HEAD_INIT(smc_lgr_list.list),
  45         .num = 0,
  46 };
  47
  48 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
  49 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
  50
  51 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
  52                          struct smc_buf_desc *buf_desc);
  53 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
  54
  55 static void smc_link_down_work(struct work_struct *work);
  56
  57 /* return head of link group list and its lock for a given link group */
  58 static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
  59                                                   spinlock_t **lgr_lock)
  60 {
  61         if (lgr->is_smcd) {
  62                 *lgr_lock = &lgr->smcd->lgr_lock;
  63                 return &lgr->smcd->lgr_list;
  64         }
  65
  66         *lgr_lock = &smc_lgr_list.lock;
  67         return &smc_lgr_list.list;
  68 }
  69
  70 static void smc_ibdev_cnt_inc(struct smc_link *lnk)
  71 {
  72         atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
  73 }
  74
  75 static void smc_ibdev_cnt_dec(struct smc_link *lnk)
  76 {
  77         atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
  78 }
  79
  80 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
  81 {
  82         /* client link group creation always follows the server link group
  83          * creation. For client use a somewhat higher removal delay time,
  84          * otherwise there is a risk of out-of-sync link groups.
  85          */
  86         if (!lgr->freeing) {
  87                 mod_delayed_work(system_wq, &lgr->free_work,
  88                                  (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
  89                                                 SMC_LGR_FREE_DELAY_CLNT :
  90                                                 SMC_LGR_FREE_DELAY_SERV);
  91         }
  92 }
  93
  94 /* Register connection's alert token in our lookup structure.
  95  * To use rbtrees we have to implement our own insert core.
  96  * Requires @conns_lock
  97  * @smc         connection to register
  98  * Returns 0 on success, != otherwise.
  99  */
 100 static void smc_lgr_add_alert_token(struct smc_connection *conn)
 101 {
 102         struct rb_node **link, *parent = NULL;
 103         u32 token = conn->alert_token_local;
 104
 105         link = &conn->lgr->conns_all.rb_node;
 106         while (*link) {
 107                 struct smc_connection *cur = rb_entry(*link,
 108                                         struct smc_connection, alert_node);
 109
 110                 parent = *link;
 111                 if (cur->alert_token_local > token)
 112                         link = &parent->rb_left;
 113                 else
 114                         link = &parent->rb_right;
 115         }
 116         /* Put the new node there */
 117         rb_link_node(&conn->alert_node, parent, link);
 118         rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
 119 }
 120
 121 /* assign an SMC-R link to the connection */
 122 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
 123 {
 124         enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
 125                                        SMC_LNK_ACTIVE;
 126         int i, j;
 127
 128         /* do link balancing */
 129         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 130                 struct smc_link *lnk = &conn->lgr->lnk[i];
 131
 132                 if (lnk->state != expected || lnk->link_is_asym)
 133                         continue;
 134                 if (conn->lgr->role == SMC_CLNT) {
 135                         conn->lnk = lnk; /* temporary, SMC server assigns link*/
 136                         break;
 137                 }
 138                 if (conn->lgr->conns_num % 2) {
 139                         for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
 140                                 struct smc_link *lnk2;
 141
 142                                 lnk2 = &conn->lgr->lnk[j];
 143                                 if (lnk2->state == expected &&
 144                                     !lnk2->link_is_asym) {
 145                                         conn->lnk = lnk2;
 146                                         break;
 147                                 }
 148                         }
 149                 }
 150                 if (!conn->lnk)
 151                         conn->lnk = lnk;
 152                 break;
 153         }
 154         if (!conn->lnk)
 155                 return SMC_CLC_DECL_NOACTLINK;
 156         atomic_inc(&conn->lnk->conn_cnt);
 157         return 0;
 158 }
 159
 160 /* Register connection in link group by assigning an alert token
 161  * registered in a search tree.
 162  * Requires @conns_lock
 163  * Note that '0' is a reserved value and not assigned.
 164  */
 165 static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
 166 {
 167         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 168         static atomic_t nexttoken = ATOMIC_INIT(0);
 169         int rc;
 170
 171         if (!conn->lgr->is_smcd) {
 172                 rc = smcr_lgr_conn_assign_link(conn, first);
 173                 if (rc)
 174                         return rc;
 175         }
 176         /* find a new alert_token_local value not yet used by some connection
 177          * in this link group
 178          */
 179         sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
 180         while (!conn->alert_token_local) {
 181                 conn->alert_token_local = atomic_inc_return(&nexttoken);
 182                 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
 183                         conn->alert_token_local = 0;
 184         }
 185         smc_lgr_add_alert_token(conn);
 186         conn->lgr->conns_num++;
 187         return 0;
 188 }
 189
 190 /* Unregister connection and reset the alert token of the given connection<
 191  */
 192 static void __smc_lgr_unregister_conn(struct smc_connection *conn)
 193 {
 194         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
 195         struct smc_link_group *lgr = conn->lgr;
 196
 197         rb_erase(&conn->alert_node, &lgr->conns_all);
 198         if (conn->lnk)
 199                 atomic_dec(&conn->lnk->conn_cnt);
 200         lgr->conns_num--;
 201         conn->alert_token_local = 0;
 202         sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
 203 }
 204
 205 /* Unregister connection from lgr
 206  */
 207 static void smc_lgr_unregister_conn(struct smc_connection *conn)
 208 {
 209         struct smc_link_group *lgr = conn->lgr;
 210
 211         if (!lgr)
 212                 return;
 213         write_lock_bh(&lgr->conns_lock);
 214         if (conn->alert_token_local) {
 215                 __smc_lgr_unregister_conn(conn);
 216         }
 217         write_unlock_bh(&lgr->conns_lock);
 218         conn->lgr = NULL;
 219 }
 220
 221 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
 222 {
 223         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 224         char hostname[SMC_MAX_HOSTNAME_LEN + 1];
 225         char smc_seid[SMC_MAX_EID_LEN + 1];
 226         struct smcd_dev *smcd_dev;
 227         struct nlattr *attrs;
 228         u8 *seid = NULL;
 229         u8 *host = NULL;
 230         void *nlh;
 231
 232         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 233                           &smc_gen_nl_family, NLM_F_MULTI,
 234                           SMC_NETLINK_GET_SYS_INFO);
 235         if (!nlh)
 236                 goto errmsg;
 237         if (cb_ctx->pos[0])
 238                 goto errout;
 239         attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
 240         if (!attrs)
 241                 goto errout;
 242         if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
 243                 goto errattr;
 244         if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
 245                 goto errattr;
 246         if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
 247                 goto errattr;
 248         smc_clc_get_hostname(&host);
 249         if (host) {
 250                 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
 251                 hostname[SMC_MAX_HOSTNAME_LEN] = 0;
 252                 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
 253                         goto errattr;
 254         }
 255         mutex_lock(&smcd_dev_list.mutex);
 256         smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
 257                                             struct smcd_dev, list);
 258         if (smcd_dev)
 259                 smc_ism_get_system_eid(smcd_dev, &seid);
 260         mutex_unlock(&smcd_dev_list.mutex);
 261         if (seid && smc_ism_is_v2_capable()) {
 262                 memcpy(smc_seid, seid, SMC_MAX_EID_LEN);
 263                 smc_seid[SMC_MAX_EID_LEN] = 0;
 264                 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
 265                         goto errattr;
 266         }
 267         nla_nest_end(skb, attrs);
 268         genlmsg_end(skb, nlh);
 269         cb_ctx->pos[0] = 1;
 270         return skb->len;
 271
 272 errattr:
 273         nla_nest_cancel(skb, attrs);
 274 errout:
 275         genlmsg_cancel(skb, nlh);
 276 errmsg:
 277         return skb->len;
 278 }
 279
 280 static int smc_nl_fill_lgr(struct smc_link_group *lgr,
 281                            struct sk_buff *skb,
 282                            struct netlink_callback *cb)
 283 {
 284         char smc_target[SMC_MAX_PNETID_LEN + 1];
 285         struct nlattr *attrs;
 286
 287         attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
 288         if (!attrs)
 289                 goto errout;
 290
 291         if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
 292                 goto errattr;
 293         if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
 294                 goto errattr;
 295         if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
 296                 goto errattr;
 297         if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
 298                 goto errattr;
 299         if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
 300                 goto errattr;
 301         memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
 302         smc_target[SMC_MAX_PNETID_LEN] = 0;
 303         if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
 304                 goto errattr;
 305
 306         nla_nest_end(skb, attrs);
 307         return 0;
 308 errattr:
 309         nla_nest_cancel(skb, attrs);
 310 errout:
 311         return -EMSGSIZE;
 312 }
 313
 314 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
 315                                 struct smc_link *link,
 316                                 struct sk_buff *skb,
 317                                 struct netlink_callback *cb)
 318 {
 319         char smc_ibname[IB_DEVICE_NAME_MAX];
 320         u8 smc_gid_target[41];
 321         struct nlattr *attrs;
 322         u32 link_uid = 0;
 323         void *nlh;
 324
 325         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 326                           &smc_gen_nl_family, NLM_F_MULTI,
 327                           SMC_NETLINK_GET_LINK_SMCR);
 328         if (!nlh)
 329                 goto errmsg;
 330
 331         attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
 332         if (!attrs)
 333                 goto errout;
 334
 335         if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
 336                 goto errattr;
 337         if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
 338                 goto errattr;
 339         if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
 340                         atomic_read(&link->conn_cnt)))
 341                 goto errattr;
 342         if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
 343                 goto errattr;
 344         if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
 345                 goto errattr;
 346         snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
 347         if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
 348                 goto errattr;
 349         memcpy(&link_uid, link->link_uid, sizeof(link_uid));
 350         if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
 351                 goto errattr;
 352         memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
 353         if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
 354                 goto errattr;
 355         memset(smc_gid_target, 0, sizeof(smc_gid_target));
 356         smc_gid_be16_convert(smc_gid_target, link->gid);
 357         if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
 358                 goto errattr;
 359         memset(smc_gid_target, 0, sizeof(smc_gid_target));
 360         smc_gid_be16_convert(smc_gid_target, link->peer_gid);
 361         if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
 362                 goto errattr;
 363
 364         nla_nest_end(skb, attrs);
 365         genlmsg_end(skb, nlh);
 366         return 0;
 367 errattr:
 368         nla_nest_cancel(skb, attrs);
 369 errout:
 370         genlmsg_cancel(skb, nlh);
 371 errmsg:
 372         return -EMSGSIZE;
 373 }
 374
 375 static int smc_nl_handle_lgr(struct smc_link_group *lgr,
 376                              struct sk_buff *skb,
 377                              struct netlink_callback *cb,
 378                              bool list_links)
 379 {
 380         void *nlh;
 381         int i;
 382
 383         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 384                           &smc_gen_nl_family, NLM_F_MULTI,
 385                           SMC_NETLINK_GET_LGR_SMCR);
 386         if (!nlh)
 387                 goto errmsg;
 388         if (smc_nl_fill_lgr(lgr, skb, cb))
 389                 goto errout;
 390
 391         genlmsg_end(skb, nlh);
 392         if (!list_links)
 393                 goto out;
 394         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 395                 if (!smc_link_usable(&lgr->lnk[i]))
 396                         continue;
 397                 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
 398                         goto errout;
 399         }
 400 out:
 401         return 0;
 402
 403 errout:
 404         genlmsg_cancel(skb, nlh);
 405 errmsg:
 406         return -EMSGSIZE;
 407 }
 408
 409 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
 410                                  struct sk_buff *skb,
 411                                  struct netlink_callback *cb,
 412                                  bool list_links)
 413 {
 414         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 415         struct smc_link_group *lgr;
 416         int snum = cb_ctx->pos[0];
 417         int num = 0;
 418
 419         spin_lock_bh(&smc_lgr->lock);
 420         list_for_each_entry(lgr, &smc_lgr->list, list) {
 421                 if (num < snum)
 422                         goto next;
 423                 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
 424                         goto errout;
 425 next:
 426                 num++;
 427         }
 428 errout:
 429         spin_unlock_bh(&smc_lgr->lock);
 430         cb_ctx->pos[0] = num;
 431 }
 432
 433 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
 434                                 struct sk_buff *skb,
 435                                 struct netlink_callback *cb)
 436 {
 437         char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
 438         char smc_pnet[SMC_MAX_PNETID_LEN + 1];
 439         char smc_eid[SMC_MAX_EID_LEN + 1];
 440         struct nlattr *v2_attrs;
 441         struct nlattr *attrs;
 442         void *nlh;
 443
 444         nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
 445                           &smc_gen_nl_family, NLM_F_MULTI,
 446                           SMC_NETLINK_GET_LGR_SMCD);
 447         if (!nlh)
 448                 goto errmsg;
 449
 450         attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
 451         if (!attrs)
 452                 goto errout;
 453
 454         if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
 455                 goto errattr;
 456         if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
 457                               SMC_NLA_LGR_D_PAD))
 458                 goto errattr;
 459         if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
 460                               SMC_NLA_LGR_D_PAD))
 461                 goto errattr;
 462         if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
 463                 goto errattr;
 464         if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
 465                 goto errattr;
 466         if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
 467                 goto errattr;
 468         memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
 469         smc_pnet[SMC_MAX_PNETID_LEN] = 0;
 470         if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
 471                 goto errattr;
 472
 473         v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_V2);
 474         if (!v2_attrs)
 475                 goto errattr;
 476         if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
 477                 goto errv2attr;
 478         if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
 479                 goto errv2attr;
 480         if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
 481                 goto errv2attr;
 482         memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN);
 483         smc_host[SMC_MAX_HOSTNAME_LEN] = 0;
 484         if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
 485                 goto errv2attr;
 486         memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN);
 487         smc_eid[SMC_MAX_EID_LEN] = 0;
 488         if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
 489                 goto errv2attr;
 490
 491         nla_nest_end(skb, v2_attrs);
 492         nla_nest_end(skb, attrs);
 493         genlmsg_end(skb, nlh);
 494         return 0;
 495
 496 errv2attr:
 497         nla_nest_cancel(skb, v2_attrs);
 498 errattr:
 499         nla_nest_cancel(skb, attrs);
 500 errout:
 501         genlmsg_cancel(skb, nlh);
 502 errmsg:
 503         return -EMSGSIZE;
 504 }
 505
 506 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
 507                                   struct sk_buff *skb,
 508                                   struct netlink_callback *cb)
 509 {
 510         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 511         struct smc_link_group *lgr;
 512         int snum = cb_ctx->pos[1];
 513         int rc = 0, num = 0;
 514
 515         spin_lock_bh(&dev->lgr_lock);
 516         list_for_each_entry(lgr, &dev->lgr_list, list) {
 517                 if (!lgr->is_smcd)
 518                         continue;
 519                 if (num < snum)
 520                         goto next;
 521                 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
 522                 if (rc)
 523                         goto errout;
 524 next:
 525                 num++;
 526         }
 527 errout:
 528         spin_unlock_bh(&dev->lgr_lock);
 529         cb_ctx->pos[1] = num;
 530         return rc;
 531 }
 532
 533 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
 534                                 struct sk_buff *skb,
 535                                 struct netlink_callback *cb)
 536 {
 537         struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
 538         struct smcd_dev *smcd_dev;
 539         int snum = cb_ctx->pos[0];
 540         int rc = 0, num = 0;
 541
 542         mutex_lock(&dev_list->mutex);
 543         list_for_each_entry(smcd_dev, &dev_list->list, list) {
 544                 if (list_empty(&smcd_dev->lgr_list))
 545                         continue;
 546                 if (num < snum)
 547                         goto next;
 548                 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
 549                 if (rc)
 550                         goto errout;
 551 next:
 552                 num++;
 553         }
 554 errout:
 555         mutex_unlock(&dev_list->mutex);
 556         cb_ctx->pos[0] = num;
 557         return rc;
 558 }
 559
 560 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
 561 {
 562         bool list_links = false;
 563
 564         smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
 565         return skb->len;
 566 }
 567
 568 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
 569 {
 570         bool list_links = true;
 571
 572         smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
 573         return skb->len;
 574 }
 575
 576 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
 577 {
 578         smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
 579         return skb->len;
 580 }
 581
 582 void smc_lgr_cleanup_early(struct smc_connection *conn)
 583 {
 584         struct smc_link_group *lgr = conn->lgr;
 585         struct list_head *lgr_list;
 586         spinlock_t *lgr_lock;
 587
 588         if (!lgr)
 589                 return;
 590
 591         smc_conn_free(conn);
 592         lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
 593         spin_lock_bh(lgr_lock);
 594         /* do not use this link group for new connections */
 595         if (!list_empty(lgr_list))
 596                 list_del_init(lgr_list);
 597         spin_unlock_bh(lgr_lock);
 598         __smc_lgr_terminate(lgr, true);
 599 }
 600
 601 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
 602 {
 603         int i;
 604
 605         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 606                 struct smc_link *lnk = &lgr->lnk[i];
 607
 608                 if (smc_link_usable(lnk))
 609                         lnk->state = SMC_LNK_INACTIVE;
 610         }
 611         wake_up_all(&lgr->llc_msg_waiter);
 612         wake_up_all(&lgr->llc_flow_waiter);
 613 }
 614
 615 static void smc_lgr_free(struct smc_link_group *lgr);
 616
 617 static void smc_lgr_free_work(struct work_struct *work)
 618 {
 619         struct smc_link_group *lgr = container_of(to_delayed_work(work),
 620                                                   struct smc_link_group,
 621                                                   free_work);
 622         spinlock_t *lgr_lock;
 623         bool conns;
 624
 625         smc_lgr_list_head(lgr, &lgr_lock);
 626         spin_lock_bh(lgr_lock);
 627         if (lgr->freeing) {
 628                 spin_unlock_bh(lgr_lock);
 629                 return;
 630         }
 631         read_lock_bh(&lgr->conns_lock);
 632         conns = RB_EMPTY_ROOT(&lgr->conns_all);
 633         read_unlock_bh(&lgr->conns_lock);
 634         if (!conns) { /* number of lgr connections is no longer zero */
 635                 spin_unlock_bh(lgr_lock);
 636                 return;
 637         }
 638         list_del_init(&lgr->list); /* remove from smc_lgr_list */
 639         lgr->freeing = 1; /* this instance does the freeing, no new schedule */
 640         spin_unlock_bh(lgr_lock);
 641         cancel_delayed_work(&lgr->free_work);
 642
 643         if (!lgr->is_smcd && !lgr->terminating)
 644                 smc_llc_send_link_delete_all(lgr, true,
 645                                              SMC_LLC_DEL_PROG_INIT_TERM);
 646         if (lgr->is_smcd && !lgr->terminating)
 647                 smc_ism_signal_shutdown(lgr);
 648         if (!lgr->is_smcd)
 649                 smcr_lgr_link_deactivate_all(lgr);
 650         smc_lgr_free(lgr);
 651 }
 652
 653 static void smc_lgr_terminate_work(struct work_struct *work)
 654 {
 655         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
 656                                                   terminate_work);
 657
 658         __smc_lgr_terminate(lgr, true);
 659 }
 660
 661 /* return next unique link id for the lgr */
 662 static u8 smcr_next_link_id(struct smc_link_group *lgr)
 663 {
 664         u8 link_id;
 665         int i;
 666
 667         while (1) {
 668                 link_id = ++lgr->next_link_id;
 669                 if (!link_id)   /* skip zero as link_id */
 670                         link_id = ++lgr->next_link_id;
 671                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 672                         if (smc_link_usable(&lgr->lnk[i]) &&
 673                             lgr->lnk[i].link_id == link_id)
 674                                 continue;
 675                 }
 676                 break;
 677         }
 678         return link_id;
 679 }
 680
 681 static void smcr_copy_dev_info_to_link(struct smc_link *link)
 682 {
 683         struct smc_ib_device *smcibdev = link->smcibdev;
 684
 685         snprintf(link->ibname, sizeof(link->ibname), "%s",
 686                  smcibdev->ibdev->name);
 687         link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
 688 }
 689
 690 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
 691                    u8 link_idx, struct smc_init_info *ini)
 692 {
 693         u8 rndvec[3];
 694         int rc;
 695
 696         get_device(&ini->ib_dev->ibdev->dev);
 697         atomic_inc(&ini->ib_dev->lnk_cnt);
 698         lnk->link_id = smcr_next_link_id(lgr);
 699         lnk->lgr = lgr;
 700         lnk->link_idx = link_idx;
 701         lnk->smcibdev = ini->ib_dev;
 702         lnk->ibport = ini->ib_port;
 703         smc_ibdev_cnt_inc(lnk);
 704         smcr_copy_dev_info_to_link(lnk);
 705         lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
 706         atomic_set(&lnk->conn_cnt, 0);
 707         smc_llc_link_set_uid(lnk);
 708         INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
 709         if (!ini->ib_dev->initialized) {
 710                 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
 711                 if (rc)
 712                         goto out;
 713         }
 714         get_random_bytes(rndvec, sizeof(rndvec));
 715         lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
 716                 (rndvec[2] << 16);
 717         rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
 718                                   ini->vlan_id, lnk->gid, &lnk->sgid_index);
 719         if (rc)
 720                 goto out;
 721         rc = smc_llc_link_init(lnk);
 722         if (rc)
 723                 goto out;
 724         rc = smc_wr_alloc_link_mem(lnk);
 725         if (rc)
 726                 goto clear_llc_lnk;
 727         rc = smc_ib_create_protection_domain(lnk);
 728         if (rc)
 729                 goto free_link_mem;
 730         rc = smc_ib_create_queue_pair(lnk);
 731         if (rc)
 732                 goto dealloc_pd;
 733         rc = smc_wr_create_link(lnk);
 734         if (rc)
 735                 goto destroy_qp;
 736         lnk->state = SMC_LNK_ACTIVATING;
 737         return 0;
 738
 739 destroy_qp:
 740         smc_ib_destroy_queue_pair(lnk);
 741 dealloc_pd:
 742         smc_ib_dealloc_protection_domain(lnk);
 743 free_link_mem:
 744         smc_wr_free_link_mem(lnk);
 745 clear_llc_lnk:
 746         smc_llc_link_clear(lnk, false);
 747 out:
 748         smc_ibdev_cnt_dec(lnk);
 749         put_device(&ini->ib_dev->ibdev->dev);
 750         memset(lnk, 0, sizeof(struct smc_link));
 751         lnk->state = SMC_LNK_UNUSED;
 752         if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
 753                 wake_up(&ini->ib_dev->lnks_deleted);
 754         return rc;
 755 }
 756
 757 /* create a new SMC link group */
 758 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
 759 {
 760         struct smc_link_group *lgr;
 761         struct list_head *lgr_list;
 762         struct smc_link *lnk;
 763         spinlock_t *lgr_lock;
 764         u8 link_idx;
 765         int rc = 0;
 766         int i;
 767
 768         if (ini->is_smcd && ini->vlan_id) {
 769                 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
 770                                      ini->vlan_id)) {
 771                         rc = SMC_CLC_DECL_ISMVLANERR;
 772                         goto out;
 773                 }
 774         }
 775
 776         lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
 777         if (!lgr) {
 778                 rc = SMC_CLC_DECL_MEM;
 779                 goto ism_put_vlan;
 780         }
 781         lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
 782                                      SMC_LGR_ID_SIZE, &lgr->id);
 783         if (!lgr->tx_wq) {
 784                 rc = -ENOMEM;
 785                 goto free_lgr;
 786         }
 787         lgr->is_smcd = ini->is_smcd;
 788         lgr->sync_err = 0;
 789         lgr->terminating = 0;
 790         lgr->freeing = 0;
 791         lgr->vlan_id = ini->vlan_id;
 792         mutex_init(&lgr->sndbufs_lock);
 793         mutex_init(&lgr->rmbs_lock);
 794         rwlock_init(&lgr->conns_lock);
 795         for (i = 0; i < SMC_RMBE_SIZES; i++) {
 796                 INIT_LIST_HEAD(&lgr->sndbufs[i]);
 797                 INIT_LIST_HEAD(&lgr->rmbs[i]);
 798         }
 799         lgr->next_link_id = 0;
 800         smc_lgr_list.num += SMC_LGR_NUM_INCR;
 801         memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
 802         INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
 803         INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
 804         lgr->conns_all = RB_ROOT;
 805         if (ini->is_smcd) {
 806                 /* SMC-D specific settings */
 807                 get_device(&ini->ism_dev[ini->ism_selected]->dev);
 808                 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
 809                 lgr->smcd = ini->ism_dev[ini->ism_selected];
 810                 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
 811                 lgr_lock = &lgr->smcd->lgr_lock;
 812                 lgr->smc_version = ini->smcd_version;
 813                 lgr->peer_shutdown = 0;
 814                 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
 815         } else {
 816                 /* SMC-R specific settings */
 817                 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
 818                 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
 819                        SMC_SYSTEMID_LEN);
 820                 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
 821                        SMC_MAX_PNETID_LEN);
 822                 smc_llc_lgr_init(lgr, smc);
 823
 824                 link_idx = SMC_SINGLE_LINK;
 825                 lnk = &lgr->lnk[link_idx];
 826                 rc = smcr_link_init(lgr, lnk, link_idx, ini);
 827                 if (rc)
 828                         goto free_wq;
 829                 lgr_list = &smc_lgr_list.list;
 830                 lgr_lock = &smc_lgr_list.lock;
 831                 atomic_inc(&lgr_cnt);
 832         }
 833         smc->conn.lgr = lgr;
 834         spin_lock_bh(lgr_lock);
 835         list_add_tail(&lgr->list, lgr_list);
 836         spin_unlock_bh(lgr_lock);
 837         return 0;
 838
 839 free_wq:
 840         destroy_workqueue(lgr->tx_wq);
 841 free_lgr:
 842         kfree(lgr);
 843 ism_put_vlan:
 844         if (ini->is_smcd && ini->vlan_id)
 845                 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
 846 out:
 847         if (rc < 0) {
 848                 if (rc == -ENOMEM)
 849                         rc = SMC_CLC_DECL_MEM;
 850                 else
 851                         rc = SMC_CLC_DECL_INTERR;
 852         }
 853         return rc;
 854 }
 855
 856 static int smc_write_space(struct smc_connection *conn)
 857 {
 858         int buffer_len = conn->peer_rmbe_size;
 859         union smc_host_cursor prod;
 860         union smc_host_cursor cons;
 861         int space;
 862
 863         smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
 864         smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
 865         /* determine rx_buf space */
 866         space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
 867         return space;
 868 }
 869
 870 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
 871                              struct smc_wr_buf *wr_buf)
 872 {
 873         struct smc_connection *conn = &smc->conn;
 874         union smc_host_cursor cons, fin;
 875         int rc = 0;
 876         int diff;
 877
 878         smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
 879         smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
 880         /* set prod cursor to old state, enforce tx_rdma_writes() */
 881         smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
 882         smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
 883
 884         if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
 885                 /* cons cursor advanced more than fin, and prod was set
 886                  * fin above, so now prod is smaller than cons. Fix that.
 887                  */
 888                 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
 889                 smc_curs_add(conn->sndbuf_desc->len,
 890                              &conn->tx_curs_sent, diff);
 891                 smc_curs_add(conn->sndbuf_desc->len,
 892                              &conn->tx_curs_fin, diff);
 893
 894                 smp_mb__before_atomic();
 895                 atomic_add(diff, &conn->sndbuf_space);
 896                 smp_mb__after_atomic();
 897
 898                 smc_curs_add(conn->peer_rmbe_size,
 899                              &conn->local_tx_ctrl.prod, diff);
 900                 smc_curs_add(conn->peer_rmbe_size,
 901                              &conn->local_tx_ctrl_fin, diff);
 902         }
 903         /* recalculate, value is used by tx_rdma_writes() */
 904         atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
 905
 906         if (smc->sk.sk_state != SMC_INIT &&
 907             smc->sk.sk_state != SMC_CLOSED) {
 908                 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
 909                 if (!rc) {
 910                         queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
 911                         smc->sk.sk_data_ready(&smc->sk);
 912                 }
 913         } else {
 914                 smc_wr_tx_put_slot(conn->lnk,
 915                                    (struct smc_wr_tx_pend_priv *)pend);
 916         }
 917         return rc;
 918 }
 919
 920 void smc_switch_link_and_count(struct smc_connection *conn,
 921                                struct smc_link *to_lnk)
 922 {
 923         atomic_dec(&conn->lnk->conn_cnt);
 924         conn->lnk = to_lnk;
 925         atomic_inc(&conn->lnk->conn_cnt);
 926 }
 927
 928 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
 929                                   struct smc_link *from_lnk, bool is_dev_err)
 930 {
 931         struct smc_link *to_lnk = NULL;
 932         struct smc_cdc_tx_pend *pend;
 933         struct smc_connection *conn;
 934         struct smc_wr_buf *wr_buf;
 935         struct smc_sock *smc;
 936         struct rb_node *node;
 937         int i, rc = 0;
 938
 939         /* link is inactive, wake up tx waiters */
 940         smc_wr_wakeup_tx_wait(from_lnk);
 941
 942         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 943                 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
 944                         continue;
 945                 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
 946                     from_lnk->ibport == lgr->lnk[i].ibport) {
 947                         continue;
 948                 }
 949                 to_lnk = &lgr->lnk[i];
 950                 break;
 951         }
 952         if (!to_lnk) {
 953                 smc_lgr_terminate_sched(lgr);
 954                 return NULL;
 955         }
 956 again:
 957         read_lock_bh(&lgr->conns_lock);
 958         for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
 959                 conn = rb_entry(node, struct smc_connection, alert_node);
 960                 if (conn->lnk != from_lnk)
 961                         continue;
 962                 smc = container_of(conn, struct smc_sock, conn);
 963                 /* conn->lnk not yet set in SMC_INIT state */
 964                 if (smc->sk.sk_state == SMC_INIT)
 965                         continue;
 966                 if (smc->sk.sk_state == SMC_CLOSED ||
 967                     smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
 968                     smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
 969                     smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
 970                     smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
 971                     smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
 972                     smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
 973                     smc->sk.sk_state == SMC_PEERABORTWAIT ||
 974                     smc->sk.sk_state == SMC_PROCESSABORT) {
 975                         spin_lock_bh(&conn->send_lock);
 976                         smc_switch_link_and_count(conn, to_lnk);
 977                         spin_unlock_bh(&conn->send_lock);
 978                         continue;
 979                 }
 980                 sock_hold(&smc->sk);
 981                 read_unlock_bh(&lgr->conns_lock);
 982                 /* pre-fetch buffer outside of send_lock, might sleep */
 983                 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
 984                 if (rc) {
 985                         smcr_link_down_cond_sched(to_lnk);
 986                         return NULL;
 987                 }
 988                 /* avoid race with smcr_tx_sndbuf_nonempty() */
 989                 spin_lock_bh(&conn->send_lock);
 990                 smc_switch_link_and_count(conn, to_lnk);
 991                 rc = smc_switch_cursor(smc, pend, wr_buf);
 992                 spin_unlock_bh(&conn->send_lock);
 993                 sock_put(&smc->sk);
 994                 if (rc) {
 995                         smcr_link_down_cond_sched(to_lnk);
 996                         return NULL;
 997                 }
 998                 goto again;
 999         }
1000         read_unlock_bh(&lgr->conns_lock);
1001         return to_lnk;
1002 }
1003
1004 static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
1005                            struct smc_link_group *lgr)
1006 {
1007         int rc;
1008
1009         if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1010                 /* unregister rmb with peer */
1011                 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1012                 if (!rc) {
1013                         /* protect against smc_llc_cli_rkey_exchange() */
1014                         mutex_lock(&lgr->llc_conf_mutex);
1015                         smc_llc_do_delete_rkey(lgr, rmb_desc);
1016                         rmb_desc->is_conf_rkey = false;
1017                         mutex_unlock(&lgr->llc_conf_mutex);
1018                         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1019                 }
1020         }
1021
1022         if (rmb_desc->is_reg_err) {
1023                 /* buf registration failed, reuse not possible */
1024                 mutex_lock(&lgr->rmbs_lock);
1025                 list_del(&rmb_desc->list);
1026                 mutex_unlock(&lgr->rmbs_lock);
1027
1028                 smc_buf_free(lgr, true, rmb_desc);
1029         } else {
1030                 rmb_desc->used = 0;
1031         }
1032 }
1033
1034 static void smc_buf_unuse(struct smc_connection *conn,
1035                           struct smc_link_group *lgr)
1036 {
1037         if (conn->sndbuf_desc)
1038                 conn->sndbuf_desc->used = 0;
1039         if (conn->rmb_desc && lgr->is_smcd)
1040                 conn->rmb_desc->used = 0;
1041         else if (conn->rmb_desc)
1042                 smcr_buf_unuse(conn->rmb_desc, lgr);
1043 }
1044
1045 /* remove a finished connection from its link group */
1046 void smc_conn_free(struct smc_connection *conn)
1047 {
1048         struct smc_link_group *lgr = conn->lgr;
1049
1050         if (!lgr)
1051                 return;
1052         if (lgr->is_smcd) {
1053                 if (!list_empty(&lgr->list))
1054                         smc_ism_unset_conn(conn);
1055                 tasklet_kill(&conn->rx_tsklet);
1056         } else {
1057                 smc_cdc_tx_dismiss_slots(conn);
1058                 if (current_work() != &conn->abort_work)
1059                         cancel_work_sync(&conn->abort_work);
1060         }
1061         if (!list_empty(&lgr->list)) {
1062                 smc_lgr_unregister_conn(conn);
1063                 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1064         }
1065
1066         if (!lgr->conns_num)
1067                 smc_lgr_schedule_free_work(lgr);
1068 }
1069
1070 /* unregister a link from a buf_desc */
1071 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1072                                 struct smc_link *lnk)
1073 {
1074         if (is_rmb)
1075                 buf_desc->is_reg_mr[lnk->link_idx] = false;
1076         if (!buf_desc->is_map_ib[lnk->link_idx])
1077                 return;
1078         if (is_rmb) {
1079                 if (buf_desc->mr_rx[lnk->link_idx]) {
1080                         smc_ib_put_memory_region(
1081                                         buf_desc->mr_rx[lnk->link_idx]);
1082                         buf_desc->mr_rx[lnk->link_idx] = NULL;
1083                 }
1084                 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1085         } else {
1086                 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1087         }
1088         sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1089         buf_desc->is_map_ib[lnk->link_idx] = false;
1090 }
1091
1092 /* unmap all buffers of lgr for a deleted link */
1093 static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1094 {
1095         struct smc_link_group *lgr = lnk->lgr;
1096         struct smc_buf_desc *buf_desc, *bf;
1097         int i;
1098
1099         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1100                 mutex_lock(&lgr->rmbs_lock);
1101                 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1102                         smcr_buf_unmap_link(buf_desc, true, lnk);
1103                 mutex_unlock(&lgr->rmbs_lock);
1104                 mutex_lock(&lgr->sndbufs_lock);
1105                 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1106                                          list)
1107                         smcr_buf_unmap_link(buf_desc, false, lnk);
1108                 mutex_unlock(&lgr->sndbufs_lock);
1109         }
1110 }
1111
1112 static void smcr_rtoken_clear_link(struct smc_link *lnk)
1113 {
1114         struct smc_link_group *lgr = lnk->lgr;
1115         int i;
1116
1117         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1118                 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1119                 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1120         }
1121 }
1122
1123 /* must be called under lgr->llc_conf_mutex lock */
1124 void smcr_link_clear(struct smc_link *lnk, bool log)
1125 {
1126         struct smc_ib_device *smcibdev;
1127
1128         if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
1129                 return;
1130         lnk->peer_qpn = 0;
1131         smc_llc_link_clear(lnk, log);
1132         smcr_buf_unmap_lgr(lnk);
1133         smcr_rtoken_clear_link(lnk);
1134         smc_ib_modify_qp_reset(lnk);
1135         smc_wr_free_link(lnk);
1136         smc_ib_destroy_queue_pair(lnk);
1137         smc_ib_dealloc_protection_domain(lnk);
1138         smc_wr_free_link_mem(lnk);
1139         smc_ibdev_cnt_dec(lnk);
1140         put_device(&lnk->smcibdev->ibdev->dev);
1141         smcibdev = lnk->smcibdev;
1142         memset(lnk, 0, sizeof(struct smc_link));
1143         lnk->state = SMC_LNK_UNUSED;
1144         if (!atomic_dec_return(&smcibdev->lnk_cnt))
1145                 wake_up(&smcibdev->lnks_deleted);
1146 }
1147
1148 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1149                           struct smc_buf_desc *buf_desc)
1150 {
1151         int i;
1152
1153         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1154                 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1155
1156         if (buf_desc->pages)
1157                 __free_pages(buf_desc->pages, buf_desc->order);
1158         kfree(buf_desc);
1159 }
1160
1161 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1162                           struct smc_buf_desc *buf_desc)
1163 {
1164         if (is_dmb) {
1165                 /* restore original buf len */
1166                 buf_desc->len += sizeof(struct smcd_cdc_msg);
1167                 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1168         } else {
1169                 kfree(buf_desc->cpu_addr);
1170         }
1171         kfree(buf_desc);
1172 }
1173
1174 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1175                          struct smc_buf_desc *buf_desc)
1176 {
1177         if (lgr->is_smcd)
1178                 smcd_buf_free(lgr, is_rmb, buf_desc);
1179         else
1180                 smcr_buf_free(lgr, is_rmb, buf_desc);
1181 }
1182
1183 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1184 {
1185         struct smc_buf_desc *buf_desc, *bf_desc;
1186         struct list_head *buf_list;
1187         int i;
1188
1189         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1190                 if (is_rmb)
1191                         buf_list = &lgr->rmbs[i];
1192                 else
1193                         buf_list = &lgr->sndbufs[i];
1194                 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1195                                          list) {
1196                         list_del(&buf_desc->list);
1197                         smc_buf_free(lgr, is_rmb, buf_desc);
1198                 }
1199         }
1200 }
1201
1202 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1203 {
1204         /* free send buffers */
1205         __smc_lgr_free_bufs(lgr, false);
1206         /* free rmbs */
1207         __smc_lgr_free_bufs(lgr, true);
1208 }
1209
1210 /* remove a link group */
1211 static void smc_lgr_free(struct smc_link_group *lgr)
1212 {
1213         int i;
1214
1215         if (!lgr->is_smcd) {
1216                 mutex_lock(&lgr->llc_conf_mutex);
1217                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1218                         if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1219                                 smcr_link_clear(&lgr->lnk[i], false);
1220                 }
1221                 mutex_unlock(&lgr->llc_conf_mutex);
1222                 smc_llc_lgr_clear(lgr);
1223         }
1224
1225         smc_lgr_free_bufs(lgr);
1226         destroy_workqueue(lgr->tx_wq);
1227         if (lgr->is_smcd) {
1228                 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1229                 put_device(&lgr->smcd->dev);
1230                 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1231                         wake_up(&lgr->smcd->lgrs_deleted);
1232         } else {
1233                 if (!atomic_dec_return(&lgr_cnt))
1234                         wake_up(&lgrs_deleted);
1235         }
1236         kfree(lgr);
1237 }
1238
1239 static void smc_sk_wake_ups(struct smc_sock *smc)
1240 {
1241         smc->sk.sk_write_space(&smc->sk);
1242         smc->sk.sk_data_ready(&smc->sk);
1243         smc->sk.sk_state_change(&smc->sk);
1244 }
1245
1246 /* kill a connection */
1247 static void smc_conn_kill(struct smc_connection *conn, bool soft)
1248 {
1249         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1250
1251         if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1252                 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1253         else
1254                 smc_close_abort(conn);
1255         conn->killed = 1;
1256         smc->sk.sk_err = ECONNABORTED;
1257         smc_sk_wake_ups(smc);
1258         if (conn->lgr->is_smcd) {
1259                 smc_ism_unset_conn(conn);
1260                 if (soft)
1261                         tasklet_kill(&conn->rx_tsklet);
1262                 else
1263                         tasklet_unlock_wait(&conn->rx_tsklet);
1264         } else {
1265                 smc_cdc_tx_dismiss_slots(conn);
1266         }
1267         smc_lgr_unregister_conn(conn);
1268         smc_close_active_abort(smc);
1269 }
1270
1271 static void smc_lgr_cleanup(struct smc_link_group *lgr)
1272 {
1273         if (lgr->is_smcd) {
1274                 smc_ism_signal_shutdown(lgr);
1275         } else {
1276                 u32 rsn = lgr->llc_termination_rsn;
1277
1278                 if (!rsn)
1279                         rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1280                 smc_llc_send_link_delete_all(lgr, false, rsn);
1281                 smcr_lgr_link_deactivate_all(lgr);
1282         }
1283 }
1284
1285 /* terminate link group
1286  * @soft: true if link group shutdown can take its time
1287  *        false if immediate link group shutdown is required
1288  */
1289 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1290 {
1291         struct smc_connection *conn;
1292         struct smc_sock *smc;
1293         struct rb_node *node;
1294
1295         if (lgr->terminating)
1296                 return; /* lgr already terminating */
1297         /* cancel free_work sync, will terminate when lgr->freeing is set */
1298         cancel_delayed_work_sync(&lgr->free_work);
1299         lgr->terminating = 1;
1300
1301         /* kill remaining link group connections */
1302         read_lock_bh(&lgr->conns_lock);
1303         node = rb_first(&lgr->conns_all);
1304         while (node) {
1305                 read_unlock_bh(&lgr->conns_lock);
1306                 conn = rb_entry(node, struct smc_connection, alert_node);
1307                 smc = container_of(conn, struct smc_sock, conn);
1308                 sock_hold(&smc->sk); /* sock_put below */
1309                 lock_sock(&smc->sk);
1310                 smc_conn_kill(conn, soft);
1311                 release_sock(&smc->sk);
1312                 sock_put(&smc->sk); /* sock_hold above */
1313                 read_lock_bh(&lgr->conns_lock);
1314                 node = rb_first(&lgr->conns_all);
1315         }
1316         read_unlock_bh(&lgr->conns_lock);
1317         smc_lgr_cleanup(lgr);
1318         smc_lgr_free(lgr);
1319 }
1320
1321 /* unlink link group and schedule termination */
1322 void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1323 {
1324         spinlock_t *lgr_lock;
1325
1326         smc_lgr_list_head(lgr, &lgr_lock);
1327         spin_lock_bh(lgr_lock);
1328         if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1329                 spin_unlock_bh(lgr_lock);
1330                 return; /* lgr already terminating */
1331         }
1332         list_del_init(&lgr->list);
1333         lgr->freeing = 1;
1334         spin_unlock_bh(lgr_lock);
1335         schedule_work(&lgr->terminate_work);
1336 }
1337
1338 /* Called when peer lgr shutdown (regularly or abnormally) is received */
1339 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1340 {
1341         struct smc_link_group *lgr, *l;
1342         LIST_HEAD(lgr_free_list);
1343
1344         /* run common cleanup function and build free list */
1345         spin_lock_bh(&dev->lgr_lock);
1346         list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1347                 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1348                     (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1349                         if (peer_gid) /* peer triggered termination */
1350                                 lgr->peer_shutdown = 1;
1351                         list_move(&lgr->list, &lgr_free_list);
1352                         lgr->freeing = 1;
1353                 }
1354         }
1355         spin_unlock_bh(&dev->lgr_lock);
1356
1357         /* cancel the regular free workers and actually free lgrs */
1358         list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1359                 list_del_init(&lgr->list);
1360                 schedule_work(&lgr->terminate_work);
1361         }
1362 }
1363
1364 /* Called when an SMCD device is removed or the smc module is unloaded */
1365 void smc_smcd_terminate_all(struct smcd_dev *smcd)
1366 {
1367         struct smc_link_group *lgr, *lg;
1368         LIST_HEAD(lgr_free_list);
1369
1370         spin_lock_bh(&smcd->lgr_lock);
1371         list_splice_init(&smcd->lgr_list, &lgr_free_list);
1372         list_for_each_entry(lgr, &lgr_free_list, list)
1373                 lgr->freeing = 1;
1374         spin_unlock_bh(&smcd->lgr_lock);
1375
1376         list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1377                 list_del_init(&lgr->list);
1378                 __smc_lgr_terminate(lgr, false);
1379         }
1380
1381         if (atomic_read(&smcd->lgr_cnt))
1382                 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1383 }
1384
1385 /* Called when an SMCR device is removed or the smc module is unloaded.
1386  * If smcibdev is given, all SMCR link groups using this device are terminated.
1387  * If smcibdev is NULL, all SMCR link groups are terminated.
1388  */
1389 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1390 {
1391         struct smc_link_group *lgr, *lg;
1392         LIST_HEAD(lgr_free_list);
1393         int i;
1394
1395         spin_lock_bh(&smc_lgr_list.lock);
1396         if (!smcibdev) {
1397                 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1398                 list_for_each_entry(lgr, &lgr_free_list, list)
1399                         lgr->freeing = 1;
1400         } else {
1401                 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1402                         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1403                                 if (lgr->lnk[i].smcibdev == smcibdev)
1404                                         smcr_link_down_cond_sched(&lgr->lnk[i]);
1405                         }
1406                 }
1407         }
1408         spin_unlock_bh(&smc_lgr_list.lock);
1409
1410         list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1411                 list_del_init(&lgr->list);
1412                 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1413                 __smc_lgr_terminate(lgr, false);
1414         }
1415
1416         if (smcibdev) {
1417                 if (atomic_read(&smcibdev->lnk_cnt))
1418                         wait_event(smcibdev->lnks_deleted,
1419                                    !atomic_read(&smcibdev->lnk_cnt));
1420         } else {
1421                 if (atomic_read(&lgr_cnt))
1422                         wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1423         }
1424 }
1425
1426 /* set new lgr type and clear all asymmetric link tagging */
1427 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1428 {
1429         char *lgr_type = "";
1430         int i;
1431
1432         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1433                 if (smc_link_usable(&lgr->lnk[i]))
1434                         lgr->lnk[i].link_is_asym = false;
1435         if (lgr->type == new_type)
1436                 return;
1437         lgr->type = new_type;
1438
1439         switch (lgr->type) {
1440         case SMC_LGR_NONE:
1441                 lgr_type = "NONE";
1442                 break;
1443         case SMC_LGR_SINGLE:
1444                 lgr_type = "SINGLE";
1445                 break;
1446         case SMC_LGR_SYMMETRIC:
1447                 lgr_type = "SYMMETRIC";
1448                 break;
1449         case SMC_LGR_ASYMMETRIC_PEER:
1450                 lgr_type = "ASYMMETRIC_PEER";
1451                 break;
1452         case SMC_LGR_ASYMMETRIC_LOCAL:
1453                 lgr_type = "ASYMMETRIC_LOCAL";
1454                 break;
1455         }
1456         pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1457                             "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1458                             lgr_type, lgr->pnet_id);
1459 }
1460
1461 /* set new lgr type and tag a link as asymmetric */
1462 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1463                             enum smc_lgr_type new_type, int asym_lnk_idx)
1464 {
1465         smcr_lgr_set_type(lgr, new_type);
1466         lgr->lnk[asym_lnk_idx].link_is_asym = true;
1467 }
1468
1469 /* abort connection, abort_work scheduled from tasklet context */
1470 static void smc_conn_abort_work(struct work_struct *work)
1471 {
1472         struct smc_connection *conn = container_of(work,
1473                                                    struct smc_connection,
1474                                                    abort_work);
1475         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1476
1477         smc_conn_kill(conn, true);
1478         sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1479 }
1480
1481 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1482 {
1483         struct smc_link_group *lgr, *n;
1484
1485         list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1486                 struct smc_link *link;
1487
1488                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1489                             SMC_MAX_PNETID_LEN) ||
1490                     lgr->type == SMC_LGR_SYMMETRIC ||
1491                     lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1492                         continue;
1493
1494                 /* trigger local add link processing */
1495                 link = smc_llc_usable_link(lgr);
1496                 if (link)
1497                         smc_llc_add_link_local(link);
1498         }
1499 }
1500
1501 /* link is down - switch connections to alternate link,
1502  * must be called under lgr->llc_conf_mutex lock
1503  */
1504 static void smcr_link_down(struct smc_link *lnk)
1505 {
1506         struct smc_link_group *lgr = lnk->lgr;
1507         struct smc_link *to_lnk;
1508         int del_link_id;
1509
1510         if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1511                 return;
1512
1513         smc_ib_modify_qp_reset(lnk);
1514         to_lnk = smc_switch_conns(lgr, lnk, true);
1515         if (!to_lnk) { /* no backup link available */
1516                 smcr_link_clear(lnk, true);
1517                 return;
1518         }
1519         smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1520         del_link_id = lnk->link_id;
1521
1522         if (lgr->role == SMC_SERV) {
1523                 /* trigger local delete link processing */
1524                 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1525         } else {
1526                 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1527                         /* another llc task is ongoing */
1528                         mutex_unlock(&lgr->llc_conf_mutex);
1529                         wait_event_timeout(lgr->llc_flow_waiter,
1530                                 (list_empty(&lgr->list) ||
1531                                  lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1532                                 SMC_LLC_WAIT_TIME);
1533                         mutex_lock(&lgr->llc_conf_mutex);
1534                 }
1535                 if (!list_empty(&lgr->list)) {
1536                         smc_llc_send_delete_link(to_lnk, del_link_id,
1537                                                  SMC_LLC_REQ, true,
1538                                                  SMC_LLC_DEL_LOST_PATH);
1539                         smcr_link_clear(lnk, true);
1540                 }
1541                 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1542         }
1543 }
1544
1545 /* must be called under lgr->llc_conf_mutex lock */
1546 void smcr_link_down_cond(struct smc_link *lnk)
1547 {
1548         if (smc_link_downing(&lnk->state))
1549                 smcr_link_down(lnk);
1550 }
1551
1552 /* will get the lgr->llc_conf_mutex lock */
1553 void smcr_link_down_cond_sched(struct smc_link *lnk)
1554 {
1555         if (smc_link_downing(&lnk->state))
1556                 schedule_work(&lnk->link_down_wrk);
1557 }
1558
1559 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1560 {
1561         struct smc_link_group *lgr, *n;
1562         int i;
1563
1564         list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1565                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1566                             SMC_MAX_PNETID_LEN))
1567                         continue; /* lgr is not affected */
1568                 if (list_empty(&lgr->list))
1569                         continue;
1570                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1571                         struct smc_link *lnk = &lgr->lnk[i];
1572
1573                         if (smc_link_usable(lnk) &&
1574                             lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1575                                 smcr_link_down_cond_sched(lnk);
1576                 }
1577         }
1578 }
1579
1580 static void smc_link_down_work(struct work_struct *work)
1581 {
1582         struct smc_link *link = container_of(work, struct smc_link,
1583                                              link_down_wrk);
1584         struct smc_link_group *lgr = link->lgr;
1585
1586         if (list_empty(&lgr->list))
1587                 return;
1588         wake_up_all(&lgr->llc_msg_waiter);
1589         mutex_lock(&lgr->llc_conf_mutex);
1590         smcr_link_down(link);
1591         mutex_unlock(&lgr->llc_conf_mutex);
1592 }
1593
1594 /* Determine vlan of internal TCP socket.
1595  * @vlan_id: address to store the determined vlan id into
1596  */
1597 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1598 {
1599         struct dst_entry *dst = sk_dst_get(clcsock->sk);
1600         struct net_device *ndev;
1601         int i, nest_lvl, rc = 0;
1602
1603         ini->vlan_id = 0;
1604         if (!dst) {
1605                 rc = -ENOTCONN;
1606                 goto out;
1607         }
1608         if (!dst->dev) {
1609                 rc = -ENODEV;
1610                 goto out_rel;
1611         }
1612
1613         ndev = dst->dev;
1614         if (is_vlan_dev(ndev)) {
1615                 ini->vlan_id = vlan_dev_vlan_id(ndev);
1616                 goto out_rel;
1617         }
1618
1619         rtnl_lock();
1620         nest_lvl = ndev->lower_level;
1621         for (i = 0; i < nest_lvl; i++) {
1622                 struct list_head *lower = &ndev->adj_list.lower;
1623
1624                 if (list_empty(lower))
1625                         break;
1626                 lower = lower->next;
1627                 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
1628                 if (is_vlan_dev(ndev)) {
1629                         ini->vlan_id = vlan_dev_vlan_id(ndev);
1630                         break;
1631                 }
1632         }
1633         rtnl_unlock();
1634
1635 out_rel:
1636         dst_release(dst);
1637 out:
1638         return rc;
1639 }
1640
1641 static bool smcr_lgr_match(struct smc_link_group *lgr,
1642                            struct smc_clc_msg_local *lcl,
1643                            enum smc_lgr_role role, u32 clcqpn)
1644 {
1645         int i;
1646
1647         if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1648             lgr->role != role)
1649                 return false;
1650
1651         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1652                 if (!smc_link_active(&lgr->lnk[i]))
1653                         continue;
1654                 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1655                     !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1656                     !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1657                         return true;
1658         }
1659         return false;
1660 }
1661
1662 static bool smcd_lgr_match(struct smc_link_group *lgr,
1663                            struct smcd_dev *smcismdev, u64 peer_gid)
1664 {
1665         return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1666 }
1667
1668 /* create a new SMC connection (and a new link group if necessary) */
1669 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1670 {
1671         struct smc_connection *conn = &smc->conn;
1672         struct list_head *lgr_list;
1673         struct smc_link_group *lgr;
1674         enum smc_lgr_role role;
1675         spinlock_t *lgr_lock;
1676         int rc = 0;
1677
1678         lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1679                                   &smc_lgr_list.list;
1680         lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1681                                   &smc_lgr_list.lock;
1682         ini->first_contact_local = 1;
1683         role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1684         if (role == SMC_CLNT && ini->first_contact_peer)
1685                 /* create new link group as well */
1686                 goto create;
1687
1688         /* determine if an existing link group can be reused */
1689         spin_lock_bh(lgr_lock);
1690         list_for_each_entry(lgr, lgr_list, list) {
1691                 write_lock_bh(&lgr->conns_lock);
1692                 if ((ini->is_smcd ?
1693                      smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1694                                     ini->ism_peer_gid[ini->ism_selected]) :
1695                      smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
1696                     !lgr->sync_err &&
1697                     (ini->smcd_version == SMC_V2 ||
1698                      lgr->vlan_id == ini->vlan_id) &&
1699                     (role == SMC_CLNT || ini->is_smcd ||
1700                      lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
1701                         /* link group found */
1702                         ini->first_contact_local = 0;
1703                         conn->lgr = lgr;
1704                         rc = smc_lgr_register_conn(conn, false);
1705                         write_unlock_bh(&lgr->conns_lock);
1706                         if (!rc && delayed_work_pending(&lgr->free_work))
1707                                 cancel_delayed_work(&lgr->free_work);
1708                         break;
1709                 }
1710                 write_unlock_bh(&lgr->conns_lock);
1711         }
1712         spin_unlock_bh(lgr_lock);
1713         if (rc)
1714                 return rc;
1715
1716         if (role == SMC_CLNT && !ini->first_contact_peer &&
1717             ini->first_contact_local) {
1718                 /* Server reuses a link group, but Client wants to start
1719                  * a new one
1720                  * send out_of_sync decline, reason synchr. error
1721                  */
1722                 return SMC_CLC_DECL_SYNCERR;
1723         }
1724
1725 create:
1726         if (ini->first_contact_local) {
1727                 rc = smc_lgr_create(smc, ini);
1728                 if (rc)
1729                         goto out;
1730                 lgr = conn->lgr;
1731                 write_lock_bh(&lgr->conns_lock);
1732                 rc = smc_lgr_register_conn(conn, true);
1733                 write_unlock_bh(&lgr->conns_lock);
1734                 if (rc)
1735                         goto out;
1736         }
1737         conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1738         conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1739         conn->urg_state = SMC_URG_READ;
1740         INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1741         if (ini->is_smcd) {
1742                 conn->rx_off = sizeof(struct smcd_cdc_msg);
1743                 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1744         } else {
1745                 conn->rx_off = 0;
1746         }
1747 #ifndef KERNEL_HAS_ATOMIC64
1748         spin_lock_init(&conn->acurs_lock);
1749 #endif
1750
1751 out:
1752         return rc;
1753 }
1754
1755 /* convert the RMB size into the compressed notation - minimum 16K.
1756  * In contrast to plain ilog2, this rounds towards the next power of 2,
1757  * so the socket application gets at least its desired sndbuf / rcvbuf size.
1758  */
1759 static u8 smc_compress_bufsize(int size)
1760 {
1761         u8 compressed;
1762
1763         if (size <= SMC_BUF_MIN_SIZE)
1764                 return 0;
1765
1766         size = (size - 1) >> 14;
1767         compressed = ilog2(size) + 1;
1768         if (compressed >= SMC_RMBE_SIZES)
1769                 compressed = SMC_RMBE_SIZES - 1;
1770         return compressed;
1771 }
1772
1773 /* convert the RMB size from compressed notation into integer */
1774 int smc_uncompress_bufsize(u8 compressed)
1775 {
1776         u32 size;
1777
1778         size = 0x00000001 << (((int)compressed) + 14);
1779         return (int)size;
1780 }
1781
1782 /* try to reuse a sndbuf or rmb description slot for a certain
1783  * buffer size; if not available, return NULL
1784  */
1785 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1786                                              struct mutex *lock,
1787                                              struct list_head *buf_list)
1788 {
1789         struct smc_buf_desc *buf_slot;
1790
1791         mutex_lock(lock);
1792         list_for_each_entry(buf_slot, buf_list, list) {
1793                 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1794                         mutex_unlock(lock);
1795                         return buf_slot;
1796                 }
1797         }
1798         mutex_unlock(lock);
1799         return NULL;
1800 }
1801
1802 /* one of the conditions for announcing a receiver's current window size is
1803  * that it "results in a minimum increase in the window size of 10% of the
1804  * receive buffer space" [RFC7609]
1805  */
1806 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1807 {
1808         return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1809 }
1810
1811 /* map an rmb buf to a link */
1812 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1813                              struct smc_link *lnk)
1814 {
1815         int rc;
1816
1817         if (buf_desc->is_map_ib[lnk->link_idx])
1818                 return 0;
1819
1820         rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1821         if (rc)
1822                 return rc;
1823         sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1824                    buf_desc->cpu_addr, buf_desc->len);
1825
1826         /* map sg table to DMA address */
1827         rc = smc_ib_buf_map_sg(lnk, buf_desc,
1828                                is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1829         /* SMC protocol depends on mapping to one DMA address only */
1830         if (rc != 1) {
1831                 rc = -EAGAIN;
1832                 goto free_table;
1833         }
1834
1835         /* create a new memory region for the RMB */
1836         if (is_rmb) {
1837                 rc = smc_ib_get_memory_region(lnk->roce_pd,
1838                                               IB_ACCESS_REMOTE_WRITE |
1839                                               IB_ACCESS_LOCAL_WRITE,
1840                                               buf_desc, lnk->link_idx);
1841                 if (rc)
1842                         goto buf_unmap;
1843                 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1844         }
1845         buf_desc->is_map_ib[lnk->link_idx] = true;
1846         return 0;
1847
1848 buf_unmap:
1849         smc_ib_buf_unmap_sg(lnk, buf_desc,
1850                             is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1851 free_table:
1852         sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1853         return rc;
1854 }
1855
1856 /* register a new rmb on IB device,
1857  * must be called under lgr->llc_conf_mutex lock
1858  */
1859 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1860 {
1861         if (list_empty(&link->lgr->list))
1862                 return -ENOLINK;
1863         if (!rmb_desc->is_reg_mr[link->link_idx]) {
1864                 /* register memory region for new rmb */
1865                 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1866                         rmb_desc->is_reg_err = true;
1867                         return -EFAULT;
1868                 }
1869                 rmb_desc->is_reg_mr[link->link_idx] = true;
1870         }
1871         return 0;
1872 }
1873
1874 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1875                              struct list_head *lst, bool is_rmb)
1876 {
1877         struct smc_buf_desc *buf_desc, *bf;
1878         int rc = 0;
1879
1880         mutex_lock(lock);
1881         list_for_each_entry_safe(buf_desc, bf, lst, list) {
1882                 if (!buf_desc->used)
1883                         continue;
1884                 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1885                 if (rc)
1886                         goto out;
1887         }
1888 out:
1889         mutex_unlock(lock);
1890         return rc;
1891 }
1892
1893 /* map all used buffers of lgr for a new link */
1894 int smcr_buf_map_lgr(struct smc_link *lnk)
1895 {
1896         struct smc_link_group *lgr = lnk->lgr;
1897         int i, rc = 0;
1898
1899         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1900                 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1901                                        &lgr->rmbs[i], true);
1902                 if (rc)
1903                         return rc;
1904                 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1905                                        &lgr->sndbufs[i], false);
1906                 if (rc)
1907                         return rc;
1908         }
1909         return 0;
1910 }
1911
1912 /* register all used buffers of lgr for a new link,
1913  * must be called under lgr->llc_conf_mutex lock
1914  */
1915 int smcr_buf_reg_lgr(struct smc_link *lnk)
1916 {
1917         struct smc_link_group *lgr = lnk->lgr;
1918         struct smc_buf_desc *buf_desc, *bf;
1919         int i, rc = 0;
1920
1921         mutex_lock(&lgr->rmbs_lock);
1922         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1923                 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1924                         if (!buf_desc->used)
1925                                 continue;
1926                         rc = smcr_link_reg_rmb(lnk, buf_desc);
1927                         if (rc)
1928                                 goto out;
1929                 }
1930         }
1931 out:
1932         mutex_unlock(&lgr->rmbs_lock);
1933         return rc;
1934 }
1935
1936 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1937                                                 bool is_rmb, int bufsize)
1938 {
1939         struct smc_buf_desc *buf_desc;
1940
1941         /* try to alloc a new buffer */
1942         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1943         if (!buf_desc)
1944                 return ERR_PTR(-ENOMEM);
1945
1946         buf_desc->order = get_order(bufsize);
1947         buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1948                                       __GFP_NOMEMALLOC | __GFP_COMP |
1949                                       __GFP_NORETRY | __GFP_ZERO,
1950                                       buf_desc->order);
1951         if (!buf_desc->pages) {
1952                 kfree(buf_desc);
1953                 return ERR_PTR(-EAGAIN);
1954         }
1955         buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
1956         buf_desc->len = bufsize;
1957         return buf_desc;
1958 }
1959
1960 /* map buf_desc on all usable links,
1961  * unused buffers stay mapped as long as the link is up
1962  */
1963 static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1964                                      struct smc_buf_desc *buf_desc, bool is_rmb)
1965 {
1966         int i, rc = 0;
1967
1968         /* protect against parallel link reconfiguration */
1969         mutex_lock(&lgr->llc_conf_mutex);
1970         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1971                 struct smc_link *lnk = &lgr->lnk[i];
1972
1973                 if (!smc_link_usable(lnk))
1974                         continue;
1975                 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
1976                         rc = -ENOMEM;
1977                         goto out;
1978                 }
1979         }
1980 out:
1981         mutex_unlock(&lgr->llc_conf_mutex);
1982         return rc;
1983 }
1984
1985 #define SMCD_DMBE_SIZES         6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1986
1987 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
1988                                                 bool is_dmb, int bufsize)
1989 {
1990         struct smc_buf_desc *buf_desc;
1991         int rc;
1992
1993         if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
1994                 return ERR_PTR(-EAGAIN);
1995
1996         /* try to alloc a new DMB */
1997         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1998         if (!buf_desc)
1999                 return ERR_PTR(-ENOMEM);
2000         if (is_dmb) {
2001                 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2002                 if (rc) {
2003                         kfree(buf_desc);
2004                         if (rc == -ENOMEM)
2005                                 return ERR_PTR(-EAGAIN);
2006                         if (rc == -ENOSPC)
2007                                 return ERR_PTR(-ENOSPC);
2008                         return ERR_PTR(-EIO);
2009                 }
2010                 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2011                 /* CDC header stored in buf. So, pretend it was smaller */
2012                 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2013         } else {
2014                 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2015                                              __GFP_NOWARN | __GFP_NORETRY |
2016                                              __GFP_NOMEMALLOC);
2017                 if (!buf_desc->cpu_addr) {
2018                         kfree(buf_desc);
2019                         return ERR_PTR(-EAGAIN);
2020                 }
2021                 buf_desc->len = bufsize;
2022         }
2023         return buf_desc;
2024 }
2025
2026 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2027 {
2028         struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2029         struct smc_connection *conn = &smc->conn;
2030         struct smc_link_group *lgr = conn->lgr;
2031         struct list_head *buf_list;
2032         int bufsize, bufsize_short;
2033         bool is_dgraded = false;
2034         struct mutex *lock;     /* lock buffer list */
2035         int sk_buf_size;
2036
2037         if (is_rmb)
2038                 /* use socket recv buffer size (w/o overhead) as start value */
2039                 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2040         else
2041                 /* use socket send buffer size (w/o overhead) as start value */
2042                 sk_buf_size = smc->sk.sk_sndbuf / 2;
2043
2044         for (bufsize_short = smc_compress_bufsize(sk_buf_size);
2045              bufsize_short >= 0; bufsize_short--) {
2046
2047                 if (is_rmb) {
2048                         lock = &lgr->rmbs_lock;
2049                         buf_list = &lgr->rmbs[bufsize_short];
2050                 } else {
2051                         lock = &lgr->sndbufs_lock;
2052                         buf_list = &lgr->sndbufs[bufsize_short];
2053                 }
2054                 bufsize = smc_uncompress_bufsize(bufsize_short);
2055                 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
2056                         continue;
2057
2058                 /* check for reusable slot in the link group */
2059                 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2060                 if (buf_desc) {
2061                         SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2062                         SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
2063                         memset(buf_desc->cpu_addr, 0, bufsize);
2064                         break; /* found reusable slot */
2065                 }
2066
2067                 if (is_smcd)
2068                         buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2069                 else
2070                         buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2071
2072                 if (PTR_ERR(buf_desc) == -ENOMEM)
2073                         break;
2074                 if (IS_ERR(buf_desc)) {
2075                         if (!is_dgraded) {
2076                                 is_dgraded = true;
2077                                 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
2078                         }
2079                         continue;
2080                 }
2081
2082                 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
2083                 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2084                 buf_desc->used = 1;
2085                 mutex_lock(lock);
2086                 list_add(&buf_desc->list, buf_list);
2087                 mutex_unlock(lock);
2088                 break; /* found */
2089         }
2090
2091         if (IS_ERR(buf_desc))
2092                 return PTR_ERR(buf_desc);
2093
2094         if (!is_smcd) {
2095                 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2096                         smcr_buf_unuse(buf_desc, lgr);
2097                         return -ENOMEM;
2098                 }
2099         }
2100
2101         if (is_rmb) {
2102                 conn->rmb_desc = buf_desc;
2103                 conn->rmbe_size_short = bufsize_short;
2104                 smc->sk.sk_rcvbuf = bufsize * 2;
2105                 atomic_set(&conn->bytes_to_rcv, 0);
2106                 conn->rmbe_update_limit =
2107                         smc_rmb_wnd_update_limit(buf_desc->len);
2108                 if (is_smcd)
2109                         smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2110         } else {
2111                 conn->sndbuf_desc = buf_desc;
2112                 smc->sk.sk_sndbuf = bufsize * 2;
2113                 atomic_set(&conn->sndbuf_space, bufsize);
2114         }
2115         return 0;
2116 }
2117
2118 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2119 {
2120         if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2121                 return;
2122         smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2123 }
2124
2125 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2126 {
2127         if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2128                 return;
2129         smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2130 }
2131
2132 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2133 {
2134         int i;
2135
2136         if (!conn->lgr || conn->lgr->is_smcd)
2137                 return;
2138         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2139                 if (!smc_link_active(&conn->lgr->lnk[i]))
2140                         continue;
2141                 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2142                                        DMA_FROM_DEVICE);
2143         }
2144 }
2145
2146 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2147 {
2148         int i;
2149
2150         if (!conn->lgr || conn->lgr->is_smcd)
2151                 return;
2152         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2153                 if (!smc_link_active(&conn->lgr->lnk[i]))
2154                         continue;
2155                 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2156                                           DMA_FROM_DEVICE);
2157         }
2158 }
2159
2160 /* create the send and receive buffer for an SMC socket;
2161  * receive buffers are called RMBs;
2162  * (even though the SMC protocol allows more than one RMB-element per RMB,
2163  * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2164  * extra RMB for every connection in a link group
2165  */
2166 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2167 {
2168         int rc;
2169
2170         /* create send buffer */
2171         rc = __smc_buf_create(smc, is_smcd, false);
2172         if (rc)
2173                 return rc;
2174         /* create rmb */
2175         rc = __smc_buf_create(smc, is_smcd, true);
2176         if (rc) {
2177                 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2178                 list_del(&smc->conn.sndbuf_desc->list);
2179                 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2180                 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2181                 smc->conn.sndbuf_desc = NULL;
2182         }
2183         return rc;
2184 }
2185
2186 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2187 {
2188         int i;
2189
2190         for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2191                 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2192                         return i;
2193         }
2194         return -ENOSPC;
2195 }
2196
2197 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2198                                    u32 rkey)
2199 {
2200         int i;
2201
2202         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2203                 if (test_bit(i, lgr->rtokens_used_mask) &&
2204                     lgr->rtokens[i][lnk_idx].rkey == rkey)
2205                         return i;
2206         }
2207         return -ENOENT;
2208 }
2209
2210 /* set rtoken for a new link to an existing rmb */
2211 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2212                     __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2213 {
2214         int rtok_idx;
2215
2216         rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2217         if (rtok_idx == -ENOENT)
2218                 return;
2219         lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2220         lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2221 }
2222
2223 /* set rtoken for a new link whose link_id is given */
2224 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2225                      __be64 nw_vaddr, __be32 nw_rkey)
2226 {
2227         u64 dma_addr = be64_to_cpu(nw_vaddr);
2228         u32 rkey = ntohl(nw_rkey);
2229         bool found = false;
2230         int link_idx;
2231
2232         for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2233                 if (lgr->lnk[link_idx].link_id == link_id) {
2234                         found = true;
2235                         break;
2236                 }
2237         }
2238         if (!found)
2239                 return;
2240         lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2241         lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2242 }
2243
2244 /* add a new rtoken from peer */
2245 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2246 {
2247         struct smc_link_group *lgr = smc_get_lgr(lnk);
2248         u64 dma_addr = be64_to_cpu(nw_vaddr);
2249         u32 rkey = ntohl(nw_rkey);
2250         int i;
2251
2252         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2253                 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2254                     lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2255                     test_bit(i, lgr->rtokens_used_mask)) {
2256                         /* already in list */
2257                         return i;
2258                 }
2259         }
2260         i = smc_rmb_reserve_rtoken_idx(lgr);
2261         if (i < 0)
2262                 return i;
2263         lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2264         lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2265         return i;
2266 }
2267
2268 /* delete an rtoken from all links */
2269 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2270 {
2271         struct smc_link_group *lgr = smc_get_lgr(lnk);
2272         u32 rkey = ntohl(nw_rkey);
2273         int i, j;
2274
2275         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2276                 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2277                     test_bit(i, lgr->rtokens_used_mask)) {
2278                         for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2279                                 lgr->rtokens[i][j].rkey = 0;
2280                                 lgr->rtokens[i][j].dma_addr = 0;
2281                         }
2282                         clear_bit(i, lgr->rtokens_used_mask);
2283                         return 0;
2284                 }
2285         }
2286         return -ENOENT;
2287 }
2288
2289 /* save rkey and dma_addr received from peer during clc handshake */
2290 int smc_rmb_rtoken_handling(struct smc_connection *conn,
2291                             struct smc_link *lnk,
2292                             struct smc_clc_msg_accept_confirm *clc)
2293 {
2294         conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2295                                           clc->r0.rmb_rkey);
2296         if (conn->rtoken_idx < 0)
2297                 return conn->rtoken_idx;
2298         return 0;
2299 }
2300
2301 static void smc_core_going_away(void)
2302 {
2303         struct smc_ib_device *smcibdev;
2304         struct smcd_dev *smcd;
2305
2306         mutex_lock(&smc_ib_devices.mutex);
2307         list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2308                 int i;
2309
2310                 for (i = 0; i < SMC_MAX_PORTS; i++)
2311                         set_bit(i, smcibdev->ports_going_away);
2312         }
2313         mutex_unlock(&smc_ib_devices.mutex);
2314
2315         mutex_lock(&smcd_dev_list.mutex);
2316         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2317                 smcd->going_away = 1;
2318         }
2319         mutex_unlock(&smcd_dev_list.mutex);
2320 }
2321
2322 /* Clean up all SMC link groups */
2323 static void smc_lgrs_shutdown(void)
2324 {
2325         struct smcd_dev *smcd;
2326
2327         smc_core_going_away();
2328
2329         smc_smcr_terminate_all(NULL);
2330
2331         mutex_lock(&smcd_dev_list.mutex);
2332         list_for_each_entry(smcd, &smcd_dev_list.list, list)
2333                 smc_smcd_terminate_all(smcd);
2334         mutex_unlock(&smcd_dev_list.mutex);
2335 }
2336
2337 static int smc_core_reboot_event(struct notifier_block *this,
2338                                  unsigned long event, void *ptr)
2339 {
2340         smc_lgrs_shutdown();
2341         smc_ib_unregister_client();
2342         return 0;
2343 }
2344
2345 static struct notifier_block smc_reboot_notifier = {
2346         .notifier_call = smc_core_reboot_event,
2347 };
2348
2349 int __init smc_core_init(void)
2350 {
2351         return register_reboot_notifier(&smc_reboot_notifier);
2352 }
2353
2354 /* Called (from smc_exit) when module is removed */
2355 void smc_core_exit(void)
2356 {
2357         unregister_reboot_notifier(&smc_reboot_notifier);
2358         smc_lgrs_shutdown();
2359 }