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         spinlock_t *lgr_lock;
 586
 587         if (!lgr)
 588                 return;
 589
 590         smc_conn_free(conn);
 591         smc_lgr_list_head(lgr, &lgr_lock);
 592         spin_lock_bh(lgr_lock);
 593         /* do not use this link group for new connections */
 594         if (!list_empty(&lgr->list))
 595                 list_del_init(&lgr->list);
 596         spin_unlock_bh(lgr_lock);
 597         __smc_lgr_terminate(lgr, true);
 598 }
 599
 600 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
 601 {
 602         int i;
 603
 604         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
 605                 struct smc_link *lnk = &lgr->lnk[i];
 606
 607                 if (smc_link_usable(lnk))
 608                         lnk->state = SMC_LNK_INACTIVE;
 609         }
 610         wake_up_all(&lgr->llc_msg_waiter);
 611         wake_up_all(&lgr->llc_flow_waiter);
 612 }
 613
 614 static void smc_lgr_free(struct smc_link_group *lgr);
 615
 616 static void smc_lgr_free_work(struct work_struct *work)
 617 {
 618         struct smc_link_group *lgr = container_of(to_delayed_work(work),
 619                                                   struct smc_link_group,
 620                                                   free_work);
 621         spinlock_t *lgr_lock;
 622         bool conns;
 623
 624         smc_lgr_list_head(lgr, &lgr_lock);
 625         spin_lock_bh(lgr_lock);
 626         if (lgr->freeing) {
 627                 spin_unlock_bh(lgr_lock);
 628                 return;
 629         }
 630         read_lock_bh(&lgr->conns_lock);
 631         conns = RB_EMPTY_ROOT(&lgr->conns_all);
 632         read_unlock_bh(&lgr->conns_lock);
 633         if (!conns) { /* number of lgr connections is no longer zero */
 634                 spin_unlock_bh(lgr_lock);
 635                 return;
 636         }
 637         list_del_init(&lgr->list); /* remove from smc_lgr_list */
 638         lgr->freeing = 1; /* this instance does the freeing, no new schedule */
 639         spin_unlock_bh(lgr_lock);
 640         cancel_delayed_work(&lgr->free_work);
 641
 642         if (!lgr->is_smcd && !lgr->terminating)
 643                 smc_llc_send_link_delete_all(lgr, true,
 644                                              SMC_LLC_DEL_PROG_INIT_TERM);
 645         if (lgr->is_smcd && !lgr->terminating)
 646                 smc_ism_signal_shutdown(lgr);
 647         if (!lgr->is_smcd)
 648                 smcr_lgr_link_deactivate_all(lgr);
 649         smc_lgr_free(lgr);
 650 }
 651
 652 static void smc_lgr_terminate_work(struct work_struct *work)
 653 {
 654         struct smc_link_group *lgr = container_of(work, struct smc_link_group,
 655                                                   terminate_work);
 656
 657         __smc_lgr_terminate(lgr, true);
 658 }
 659
 660 /* return next unique link id for the lgr */
 661 static u8 smcr_next_link_id(struct smc_link_group *lgr)
 662 {
 663         u8 link_id;
 664         int i;
 665
 666         while (1) {
 667 again:
 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                                 goto again;
 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 || !smc_wr_tx_link_hold(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                         goto err_out;
 986                 /* avoid race with smcr_tx_sndbuf_nonempty() */
 987                 spin_lock_bh(&conn->send_lock);
 988                 smc_switch_link_and_count(conn, to_lnk);
 989                 rc = smc_switch_cursor(smc, pend, wr_buf);
 990                 spin_unlock_bh(&conn->send_lock);
 991                 sock_put(&smc->sk);
 992                 if (rc)
 993                         goto err_out;
 994                 goto again;
 995         }
 996         read_unlock_bh(&lgr->conns_lock);
 997         smc_wr_tx_link_put(to_lnk);
 998         return to_lnk;
 999
1000 err_out:
1001         smcr_link_down_cond_sched(to_lnk);
1002         smc_wr_tx_link_put(to_lnk);
1003         return NULL;
1004 }
1005
1006 static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
1007                            struct smc_link_group *lgr)
1008 {
1009         int rc;
1010
1011         if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1012                 /* unregister rmb with peer */
1013                 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1014                 if (!rc) {
1015                         /* protect against smc_llc_cli_rkey_exchange() */
1016                         mutex_lock(&lgr->llc_conf_mutex);
1017                         smc_llc_do_delete_rkey(lgr, rmb_desc);
1018                         rmb_desc->is_conf_rkey = false;
1019                         mutex_unlock(&lgr->llc_conf_mutex);
1020                         smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1021                 }
1022         }
1023
1024         if (rmb_desc->is_reg_err) {
1025                 /* buf registration failed, reuse not possible */
1026                 mutex_lock(&lgr->rmbs_lock);
1027                 list_del(&rmb_desc->list);
1028                 mutex_unlock(&lgr->rmbs_lock);
1029
1030                 smc_buf_free(lgr, true, rmb_desc);
1031         } else {
1032                 rmb_desc->used = 0;
1033         }
1034 }
1035
1036 static void smc_buf_unuse(struct smc_connection *conn,
1037                           struct smc_link_group *lgr)
1038 {
1039         if (conn->sndbuf_desc)
1040                 conn->sndbuf_desc->used = 0;
1041         if (conn->rmb_desc && lgr->is_smcd)
1042                 conn->rmb_desc->used = 0;
1043         else if (conn->rmb_desc)
1044                 smcr_buf_unuse(conn->rmb_desc, lgr);
1045 }
1046
1047 /* remove a finished connection from its link group */
1048 void smc_conn_free(struct smc_connection *conn)
1049 {
1050         struct smc_link_group *lgr = conn->lgr;
1051
1052         if (!lgr)
1053                 return;
1054         if (lgr->is_smcd) {
1055                 if (!list_empty(&lgr->list))
1056                         smc_ism_unset_conn(conn);
1057                 tasklet_kill(&conn->rx_tsklet);
1058         } else {
1059                 smc_cdc_tx_dismiss_slots(conn);
1060                 if (current_work() != &conn->abort_work)
1061                         cancel_work_sync(&conn->abort_work);
1062         }
1063         if (!list_empty(&lgr->list)) {
1064                 smc_lgr_unregister_conn(conn);
1065                 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1066         }
1067
1068         if (!lgr->conns_num)
1069                 smc_lgr_schedule_free_work(lgr);
1070 }
1071
1072 /* unregister a link from a buf_desc */
1073 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1074                                 struct smc_link *lnk)
1075 {
1076         if (is_rmb)
1077                 buf_desc->is_reg_mr[lnk->link_idx] = false;
1078         if (!buf_desc->is_map_ib[lnk->link_idx])
1079                 return;
1080         if (is_rmb) {
1081                 if (buf_desc->mr_rx[lnk->link_idx]) {
1082                         smc_ib_put_memory_region(
1083                                         buf_desc->mr_rx[lnk->link_idx]);
1084                         buf_desc->mr_rx[lnk->link_idx] = NULL;
1085                 }
1086                 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1087         } else {
1088                 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1089         }
1090         sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1091         buf_desc->is_map_ib[lnk->link_idx] = false;
1092 }
1093
1094 /* unmap all buffers of lgr for a deleted link */
1095 static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1096 {
1097         struct smc_link_group *lgr = lnk->lgr;
1098         struct smc_buf_desc *buf_desc, *bf;
1099         int i;
1100
1101         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1102                 mutex_lock(&lgr->rmbs_lock);
1103                 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1104                         smcr_buf_unmap_link(buf_desc, true, lnk);
1105                 mutex_unlock(&lgr->rmbs_lock);
1106                 mutex_lock(&lgr->sndbufs_lock);
1107                 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1108                                          list)
1109                         smcr_buf_unmap_link(buf_desc, false, lnk);
1110                 mutex_unlock(&lgr->sndbufs_lock);
1111         }
1112 }
1113
1114 static void smcr_rtoken_clear_link(struct smc_link *lnk)
1115 {
1116         struct smc_link_group *lgr = lnk->lgr;
1117         int i;
1118
1119         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1120                 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1121                 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1122         }
1123 }
1124
1125 /* must be called under lgr->llc_conf_mutex lock */
1126 void smcr_link_clear(struct smc_link *lnk, bool log)
1127 {
1128         struct smc_ib_device *smcibdev;
1129
1130         if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
1131                 return;
1132         lnk->peer_qpn = 0;
1133         smc_llc_link_clear(lnk, log);
1134         smcr_buf_unmap_lgr(lnk);
1135         smcr_rtoken_clear_link(lnk);
1136         smc_ib_modify_qp_reset(lnk);
1137         smc_wr_free_link(lnk);
1138         smc_ib_destroy_queue_pair(lnk);
1139         smc_ib_dealloc_protection_domain(lnk);
1140         smc_wr_free_link_mem(lnk);
1141         smc_ibdev_cnt_dec(lnk);
1142         put_device(&lnk->smcibdev->ibdev->dev);
1143         smcibdev = lnk->smcibdev;
1144         memset(lnk, 0, sizeof(struct smc_link));
1145         lnk->state = SMC_LNK_UNUSED;
1146         if (!atomic_dec_return(&smcibdev->lnk_cnt))
1147                 wake_up(&smcibdev->lnks_deleted);
1148 }
1149
1150 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1151                           struct smc_buf_desc *buf_desc)
1152 {
1153         int i;
1154
1155         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1156                 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1157
1158         if (buf_desc->pages)
1159                 __free_pages(buf_desc->pages, buf_desc->order);
1160         kfree(buf_desc);
1161 }
1162
1163 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1164                           struct smc_buf_desc *buf_desc)
1165 {
1166         if (is_dmb) {
1167                 /* restore original buf len */
1168                 buf_desc->len += sizeof(struct smcd_cdc_msg);
1169                 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1170         } else {
1171                 kfree(buf_desc->cpu_addr);
1172         }
1173         kfree(buf_desc);
1174 }
1175
1176 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1177                          struct smc_buf_desc *buf_desc)
1178 {
1179         if (lgr->is_smcd)
1180                 smcd_buf_free(lgr, is_rmb, buf_desc);
1181         else
1182                 smcr_buf_free(lgr, is_rmb, buf_desc);
1183 }
1184
1185 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1186 {
1187         struct smc_buf_desc *buf_desc, *bf_desc;
1188         struct list_head *buf_list;
1189         int i;
1190
1191         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1192                 if (is_rmb)
1193                         buf_list = &lgr->rmbs[i];
1194                 else
1195                         buf_list = &lgr->sndbufs[i];
1196                 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1197                                          list) {
1198                         list_del(&buf_desc->list);
1199                         smc_buf_free(lgr, is_rmb, buf_desc);
1200                 }
1201         }
1202 }
1203
1204 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1205 {
1206         /* free send buffers */
1207         __smc_lgr_free_bufs(lgr, false);
1208         /* free rmbs */
1209         __smc_lgr_free_bufs(lgr, true);
1210 }
1211
1212 /* remove a link group */
1213 static void smc_lgr_free(struct smc_link_group *lgr)
1214 {
1215         int i;
1216
1217         if (!lgr->is_smcd) {
1218                 mutex_lock(&lgr->llc_conf_mutex);
1219                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1220                         if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1221                                 smcr_link_clear(&lgr->lnk[i], false);
1222                 }
1223                 mutex_unlock(&lgr->llc_conf_mutex);
1224                 smc_llc_lgr_clear(lgr);
1225         }
1226
1227         smc_lgr_free_bufs(lgr);
1228         destroy_workqueue(lgr->tx_wq);
1229         if (lgr->is_smcd) {
1230                 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1231                 put_device(&lgr->smcd->dev);
1232                 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1233                         wake_up(&lgr->smcd->lgrs_deleted);
1234         } else {
1235                 if (!atomic_dec_return(&lgr_cnt))
1236                         wake_up(&lgrs_deleted);
1237         }
1238         kfree(lgr);
1239 }
1240
1241 static void smc_sk_wake_ups(struct smc_sock *smc)
1242 {
1243         smc->sk.sk_write_space(&smc->sk);
1244         smc->sk.sk_data_ready(&smc->sk);
1245         smc->sk.sk_state_change(&smc->sk);
1246 }
1247
1248 /* kill a connection */
1249 static void smc_conn_kill(struct smc_connection *conn, bool soft)
1250 {
1251         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1252
1253         if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1254                 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1255         else
1256                 smc_close_abort(conn);
1257         conn->killed = 1;
1258         smc->sk.sk_err = ECONNABORTED;
1259         smc_sk_wake_ups(smc);
1260         if (conn->lgr->is_smcd) {
1261                 smc_ism_unset_conn(conn);
1262                 if (soft)
1263                         tasklet_kill(&conn->rx_tsklet);
1264                 else
1265                         tasklet_unlock_wait(&conn->rx_tsklet);
1266         } else {
1267                 smc_cdc_tx_dismiss_slots(conn);
1268         }
1269         smc_lgr_unregister_conn(conn);
1270         smc_close_active_abort(smc);
1271 }
1272
1273 static void smc_lgr_cleanup(struct smc_link_group *lgr)
1274 {
1275         if (lgr->is_smcd) {
1276                 smc_ism_signal_shutdown(lgr);
1277         } else {
1278                 u32 rsn = lgr->llc_termination_rsn;
1279
1280                 if (!rsn)
1281                         rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1282                 smc_llc_send_link_delete_all(lgr, false, rsn);
1283                 smcr_lgr_link_deactivate_all(lgr);
1284         }
1285 }
1286
1287 /* terminate link group
1288  * @soft: true if link group shutdown can take its time
1289  *        false if immediate link group shutdown is required
1290  */
1291 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1292 {
1293         struct smc_connection *conn;
1294         struct smc_sock *smc;
1295         struct rb_node *node;
1296
1297         if (lgr->terminating)
1298                 return; /* lgr already terminating */
1299         /* cancel free_work sync, will terminate when lgr->freeing is set */
1300         cancel_delayed_work_sync(&lgr->free_work);
1301         lgr->terminating = 1;
1302
1303         /* kill remaining link group connections */
1304         read_lock_bh(&lgr->conns_lock);
1305         node = rb_first(&lgr->conns_all);
1306         while (node) {
1307                 read_unlock_bh(&lgr->conns_lock);
1308                 conn = rb_entry(node, struct smc_connection, alert_node);
1309                 smc = container_of(conn, struct smc_sock, conn);
1310                 sock_hold(&smc->sk); /* sock_put below */
1311                 lock_sock(&smc->sk);
1312                 smc_conn_kill(conn, soft);
1313                 release_sock(&smc->sk);
1314                 sock_put(&smc->sk); /* sock_hold above */
1315                 read_lock_bh(&lgr->conns_lock);
1316                 node = rb_first(&lgr->conns_all);
1317         }
1318         read_unlock_bh(&lgr->conns_lock);
1319         smc_lgr_cleanup(lgr);
1320         smc_lgr_free(lgr);
1321 }
1322
1323 /* unlink link group and schedule termination */
1324 void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1325 {
1326         spinlock_t *lgr_lock;
1327
1328         smc_lgr_list_head(lgr, &lgr_lock);
1329         spin_lock_bh(lgr_lock);
1330         if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1331                 spin_unlock_bh(lgr_lock);
1332                 return; /* lgr already terminating */
1333         }
1334         list_del_init(&lgr->list);
1335         lgr->freeing = 1;
1336         spin_unlock_bh(lgr_lock);
1337         schedule_work(&lgr->terminate_work);
1338 }
1339
1340 /* Called when peer lgr shutdown (regularly or abnormally) is received */
1341 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1342 {
1343         struct smc_link_group *lgr, *l;
1344         LIST_HEAD(lgr_free_list);
1345
1346         /* run common cleanup function and build free list */
1347         spin_lock_bh(&dev->lgr_lock);
1348         list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1349                 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1350                     (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1351                         if (peer_gid) /* peer triggered termination */
1352                                 lgr->peer_shutdown = 1;
1353                         list_move(&lgr->list, &lgr_free_list);
1354                         lgr->freeing = 1;
1355                 }
1356         }
1357         spin_unlock_bh(&dev->lgr_lock);
1358
1359         /* cancel the regular free workers and actually free lgrs */
1360         list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1361                 list_del_init(&lgr->list);
1362                 schedule_work(&lgr->terminate_work);
1363         }
1364 }
1365
1366 /* Called when an SMCD device is removed or the smc module is unloaded */
1367 void smc_smcd_terminate_all(struct smcd_dev *smcd)
1368 {
1369         struct smc_link_group *lgr, *lg;
1370         LIST_HEAD(lgr_free_list);
1371
1372         spin_lock_bh(&smcd->lgr_lock);
1373         list_splice_init(&smcd->lgr_list, &lgr_free_list);
1374         list_for_each_entry(lgr, &lgr_free_list, list)
1375                 lgr->freeing = 1;
1376         spin_unlock_bh(&smcd->lgr_lock);
1377
1378         list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1379                 list_del_init(&lgr->list);
1380                 __smc_lgr_terminate(lgr, false);
1381         }
1382
1383         if (atomic_read(&smcd->lgr_cnt))
1384                 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1385 }
1386
1387 /* Called when an SMCR device is removed or the smc module is unloaded.
1388  * If smcibdev is given, all SMCR link groups using this device are terminated.
1389  * If smcibdev is NULL, all SMCR link groups are terminated.
1390  */
1391 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1392 {
1393         struct smc_link_group *lgr, *lg;
1394         LIST_HEAD(lgr_free_list);
1395         int i;
1396
1397         spin_lock_bh(&smc_lgr_list.lock);
1398         if (!smcibdev) {
1399                 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1400                 list_for_each_entry(lgr, &lgr_free_list, list)
1401                         lgr->freeing = 1;
1402         } else {
1403                 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1404                         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1405                                 if (lgr->lnk[i].smcibdev == smcibdev)
1406                                         smcr_link_down_cond_sched(&lgr->lnk[i]);
1407                         }
1408                 }
1409         }
1410         spin_unlock_bh(&smc_lgr_list.lock);
1411
1412         list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1413                 list_del_init(&lgr->list);
1414                 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1415                 __smc_lgr_terminate(lgr, false);
1416         }
1417
1418         if (smcibdev) {
1419                 if (atomic_read(&smcibdev->lnk_cnt))
1420                         wait_event(smcibdev->lnks_deleted,
1421                                    !atomic_read(&smcibdev->lnk_cnt));
1422         } else {
1423                 if (atomic_read(&lgr_cnt))
1424                         wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1425         }
1426 }
1427
1428 /* set new lgr type and clear all asymmetric link tagging */
1429 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1430 {
1431         char *lgr_type = "";
1432         int i;
1433
1434         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1435                 if (smc_link_usable(&lgr->lnk[i]))
1436                         lgr->lnk[i].link_is_asym = false;
1437         if (lgr->type == new_type)
1438                 return;
1439         lgr->type = new_type;
1440
1441         switch (lgr->type) {
1442         case SMC_LGR_NONE:
1443                 lgr_type = "NONE";
1444                 break;
1445         case SMC_LGR_SINGLE:
1446                 lgr_type = "SINGLE";
1447                 break;
1448         case SMC_LGR_SYMMETRIC:
1449                 lgr_type = "SYMMETRIC";
1450                 break;
1451         case SMC_LGR_ASYMMETRIC_PEER:
1452                 lgr_type = "ASYMMETRIC_PEER";
1453                 break;
1454         case SMC_LGR_ASYMMETRIC_LOCAL:
1455                 lgr_type = "ASYMMETRIC_LOCAL";
1456                 break;
1457         }
1458         pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1459                             "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1460                             lgr_type, lgr->pnet_id);
1461 }
1462
1463 /* set new lgr type and tag a link as asymmetric */
1464 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1465                             enum smc_lgr_type new_type, int asym_lnk_idx)
1466 {
1467         smcr_lgr_set_type(lgr, new_type);
1468         lgr->lnk[asym_lnk_idx].link_is_asym = true;
1469 }
1470
1471 /* abort connection, abort_work scheduled from tasklet context */
1472 static void smc_conn_abort_work(struct work_struct *work)
1473 {
1474         struct smc_connection *conn = container_of(work,
1475                                                    struct smc_connection,
1476                                                    abort_work);
1477         struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1478
1479         lock_sock(&smc->sk);
1480         smc_conn_kill(conn, true);
1481         release_sock(&smc->sk);
1482         sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1483 }
1484
1485 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1486 {
1487         struct smc_link_group *lgr, *n;
1488
1489         list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1490                 struct smc_link *link;
1491
1492                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1493                             SMC_MAX_PNETID_LEN) ||
1494                     lgr->type == SMC_LGR_SYMMETRIC ||
1495                     lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1496                         continue;
1497
1498                 /* trigger local add link processing */
1499                 link = smc_llc_usable_link(lgr);
1500                 if (link)
1501                         smc_llc_add_link_local(link);
1502         }
1503 }
1504
1505 /* link is down - switch connections to alternate link,
1506  * must be called under lgr->llc_conf_mutex lock
1507  */
1508 static void smcr_link_down(struct smc_link *lnk)
1509 {
1510         struct smc_link_group *lgr = lnk->lgr;
1511         struct smc_link *to_lnk;
1512         int del_link_id;
1513
1514         if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1515                 return;
1516
1517         smc_ib_modify_qp_reset(lnk);
1518         to_lnk = smc_switch_conns(lgr, lnk, true);
1519         if (!to_lnk) { /* no backup link available */
1520                 smcr_link_clear(lnk, true);
1521                 return;
1522         }
1523         smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1524         del_link_id = lnk->link_id;
1525
1526         if (lgr->role == SMC_SERV) {
1527                 /* trigger local delete link processing */
1528                 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1529         } else {
1530                 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1531                         /* another llc task is ongoing */
1532                         mutex_unlock(&lgr->llc_conf_mutex);
1533                         wait_event_timeout(lgr->llc_flow_waiter,
1534                                 (list_empty(&lgr->list) ||
1535                                  lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1536                                 SMC_LLC_WAIT_TIME);
1537                         mutex_lock(&lgr->llc_conf_mutex);
1538                 }
1539                 if (!list_empty(&lgr->list)) {
1540                         smc_llc_send_delete_link(to_lnk, del_link_id,
1541                                                  SMC_LLC_REQ, true,
1542                                                  SMC_LLC_DEL_LOST_PATH);
1543                         smcr_link_clear(lnk, true);
1544                 }
1545                 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1546         }
1547 }
1548
1549 /* must be called under lgr->llc_conf_mutex lock */
1550 void smcr_link_down_cond(struct smc_link *lnk)
1551 {
1552         if (smc_link_downing(&lnk->state))
1553                 smcr_link_down(lnk);
1554 }
1555
1556 /* will get the lgr->llc_conf_mutex lock */
1557 void smcr_link_down_cond_sched(struct smc_link *lnk)
1558 {
1559         if (smc_link_downing(&lnk->state))
1560                 schedule_work(&lnk->link_down_wrk);
1561 }
1562
1563 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1564 {
1565         struct smc_link_group *lgr, *n;
1566         int i;
1567
1568         list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1569                 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1570                             SMC_MAX_PNETID_LEN))
1571                         continue; /* lgr is not affected */
1572                 if (list_empty(&lgr->list))
1573                         continue;
1574                 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1575                         struct smc_link *lnk = &lgr->lnk[i];
1576
1577                         if (smc_link_usable(lnk) &&
1578                             lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1579                                 smcr_link_down_cond_sched(lnk);
1580                 }
1581         }
1582 }
1583
1584 static void smc_link_down_work(struct work_struct *work)
1585 {
1586         struct smc_link *link = container_of(work, struct smc_link,
1587                                              link_down_wrk);
1588         struct smc_link_group *lgr = link->lgr;
1589
1590         if (list_empty(&lgr->list))
1591                 return;
1592         wake_up_all(&lgr->llc_msg_waiter);
1593         mutex_lock(&lgr->llc_conf_mutex);
1594         smcr_link_down(link);
1595         mutex_unlock(&lgr->llc_conf_mutex);
1596 }
1597
1598 static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
1599                                   struct netdev_nested_priv *priv)
1600 {
1601         unsigned short *vlan_id = (unsigned short *)priv->data;
1602
1603         if (is_vlan_dev(lower_dev)) {
1604                 *vlan_id = vlan_dev_vlan_id(lower_dev);
1605                 return 1;
1606         }
1607
1608         return 0;
1609 }
1610
1611 /* Determine vlan of internal TCP socket. */
1612 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1613 {
1614         struct dst_entry *dst = sk_dst_get(clcsock->sk);
1615         struct netdev_nested_priv priv;
1616         struct net_device *ndev;
1617         int rc = 0;
1618
1619         ini->vlan_id = 0;
1620         if (!dst) {
1621                 rc = -ENOTCONN;
1622                 goto out;
1623         }
1624         if (!dst->dev) {
1625                 rc = -ENODEV;
1626                 goto out_rel;
1627         }
1628
1629         ndev = dst->dev;
1630         if (is_vlan_dev(ndev)) {
1631                 ini->vlan_id = vlan_dev_vlan_id(ndev);
1632                 goto out_rel;
1633         }
1634
1635         priv.data = (void *)&ini->vlan_id;
1636         rtnl_lock();
1637         netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
1638         rtnl_unlock();
1639
1640 out_rel:
1641         dst_release(dst);
1642 out:
1643         return rc;
1644 }
1645
1646 static bool smcr_lgr_match(struct smc_link_group *lgr,
1647                            struct smc_clc_msg_local *lcl,
1648                            enum smc_lgr_role role, u32 clcqpn)
1649 {
1650         int i;
1651
1652         if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1653             lgr->role != role)
1654                 return false;
1655
1656         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1657                 if (!smc_link_active(&lgr->lnk[i]))
1658                         continue;
1659                 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1660                     !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1661                     !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1662                         return true;
1663         }
1664         return false;
1665 }
1666
1667 static bool smcd_lgr_match(struct smc_link_group *lgr,
1668                            struct smcd_dev *smcismdev, u64 peer_gid)
1669 {
1670         return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1671 }
1672
1673 /* create a new SMC connection (and a new link group if necessary) */
1674 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1675 {
1676         struct smc_connection *conn = &smc->conn;
1677         struct list_head *lgr_list;
1678         struct smc_link_group *lgr;
1679         enum smc_lgr_role role;
1680         spinlock_t *lgr_lock;
1681         int rc = 0;
1682
1683         lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1684                                   &smc_lgr_list.list;
1685         lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1686                                   &smc_lgr_list.lock;
1687         ini->first_contact_local = 1;
1688         role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1689         if (role == SMC_CLNT && ini->first_contact_peer)
1690                 /* create new link group as well */
1691                 goto create;
1692
1693         /* determine if an existing link group can be reused */
1694         spin_lock_bh(lgr_lock);
1695         list_for_each_entry(lgr, lgr_list, list) {
1696                 write_lock_bh(&lgr->conns_lock);
1697                 if ((ini->is_smcd ?
1698                      smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1699                                     ini->ism_peer_gid[ini->ism_selected]) :
1700                      smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
1701                     !lgr->sync_err &&
1702                     (ini->smcd_version == SMC_V2 ||
1703                      lgr->vlan_id == ini->vlan_id) &&
1704                     (role == SMC_CLNT || ini->is_smcd ||
1705                      lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
1706                         /* link group found */
1707                         ini->first_contact_local = 0;
1708                         conn->lgr = lgr;
1709                         rc = smc_lgr_register_conn(conn, false);
1710                         write_unlock_bh(&lgr->conns_lock);
1711                         if (!rc && delayed_work_pending(&lgr->free_work))
1712                                 cancel_delayed_work(&lgr->free_work);
1713                         break;
1714                 }
1715                 write_unlock_bh(&lgr->conns_lock);
1716         }
1717         spin_unlock_bh(lgr_lock);
1718         if (rc)
1719                 return rc;
1720
1721         if (role == SMC_CLNT && !ini->first_contact_peer &&
1722             ini->first_contact_local) {
1723                 /* Server reuses a link group, but Client wants to start
1724                  * a new one
1725                  * send out_of_sync decline, reason synchr. error
1726                  */
1727                 return SMC_CLC_DECL_SYNCERR;
1728         }
1729
1730 create:
1731         if (ini->first_contact_local) {
1732                 rc = smc_lgr_create(smc, ini);
1733                 if (rc)
1734                         goto out;
1735                 lgr = conn->lgr;
1736                 write_lock_bh(&lgr->conns_lock);
1737                 rc = smc_lgr_register_conn(conn, true);
1738                 write_unlock_bh(&lgr->conns_lock);
1739                 if (rc)
1740                         goto out;
1741         }
1742         conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1743         conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1744         conn->urg_state = SMC_URG_READ;
1745         INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1746         if (ini->is_smcd) {
1747                 conn->rx_off = sizeof(struct smcd_cdc_msg);
1748                 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1749         } else {
1750                 conn->rx_off = 0;
1751         }
1752 #ifndef KERNEL_HAS_ATOMIC64
1753         spin_lock_init(&conn->acurs_lock);
1754 #endif
1755
1756 out:
1757         return rc;
1758 }
1759
1760 #define SMCD_DMBE_SIZES         6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1761 #define SMCR_RMBE_SIZES         5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */
1762
1763 /* convert the RMB size into the compressed notation (minimum 16K, see
1764  * SMCD/R_DMBE_SIZES.
1765  * In contrast to plain ilog2, this rounds towards the next power of 2,
1766  * so the socket application gets at least its desired sndbuf / rcvbuf size.
1767  */
1768 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
1769 {
1770         const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE;
1771         u8 compressed;
1772
1773         if (size <= SMC_BUF_MIN_SIZE)
1774                 return 0;
1775
1776         size = (size - 1) >> 14;  /* convert to 16K multiple */
1777         compressed = min_t(u8, ilog2(size) + 1,
1778                            is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES);
1779
1780         if (!is_smcd && is_rmb)
1781                 /* RMBs are backed by & limited to max size of scatterlists */
1782                 compressed = min_t(u8, compressed, ilog2(max_scat >> 14));
1783
1784         return compressed;
1785 }
1786
1787 /* convert the RMB size from compressed notation into integer */
1788 int smc_uncompress_bufsize(u8 compressed)
1789 {
1790         u32 size;
1791
1792         size = 0x00000001 << (((int)compressed) + 14);
1793         return (int)size;
1794 }
1795
1796 /* try to reuse a sndbuf or rmb description slot for a certain
1797  * buffer size; if not available, return NULL
1798  */
1799 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1800                                              struct mutex *lock,
1801                                              struct list_head *buf_list)
1802 {
1803         struct smc_buf_desc *buf_slot;
1804
1805         mutex_lock(lock);
1806         list_for_each_entry(buf_slot, buf_list, list) {
1807                 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1808                         mutex_unlock(lock);
1809                         return buf_slot;
1810                 }
1811         }
1812         mutex_unlock(lock);
1813         return NULL;
1814 }
1815
1816 /* one of the conditions for announcing a receiver's current window size is
1817  * that it "results in a minimum increase in the window size of 10% of the
1818  * receive buffer space" [RFC7609]
1819  */
1820 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1821 {
1822         return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1823 }
1824
1825 /* map an rmb buf to a link */
1826 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1827                              struct smc_link *lnk)
1828 {
1829         int rc;
1830
1831         if (buf_desc->is_map_ib[lnk->link_idx])
1832                 return 0;
1833
1834         rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1835         if (rc)
1836                 return rc;
1837         sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1838                    buf_desc->cpu_addr, buf_desc->len);
1839
1840         /* map sg table to DMA address */
1841         rc = smc_ib_buf_map_sg(lnk, buf_desc,
1842                                is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1843         /* SMC protocol depends on mapping to one DMA address only */
1844         if (rc != 1) {
1845                 rc = -EAGAIN;
1846                 goto free_table;
1847         }
1848
1849         /* create a new memory region for the RMB */
1850         if (is_rmb) {
1851                 rc = smc_ib_get_memory_region(lnk->roce_pd,
1852                                               IB_ACCESS_REMOTE_WRITE |
1853                                               IB_ACCESS_LOCAL_WRITE,
1854                                               buf_desc, lnk->link_idx);
1855                 if (rc)
1856                         goto buf_unmap;
1857                 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1858         }
1859         buf_desc->is_map_ib[lnk->link_idx] = true;
1860         return 0;
1861
1862 buf_unmap:
1863         smc_ib_buf_unmap_sg(lnk, buf_desc,
1864                             is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1865 free_table:
1866         sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1867         return rc;
1868 }
1869
1870 /* register a new rmb on IB device,
1871  * must be called under lgr->llc_conf_mutex lock
1872  */
1873 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1874 {
1875         if (list_empty(&link->lgr->list))
1876                 return -ENOLINK;
1877         if (!rmb_desc->is_reg_mr[link->link_idx]) {
1878                 /* register memory region for new rmb */
1879                 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1880                         rmb_desc->is_reg_err = true;
1881                         return -EFAULT;
1882                 }
1883                 rmb_desc->is_reg_mr[link->link_idx] = true;
1884         }
1885         return 0;
1886 }
1887
1888 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1889                              struct list_head *lst, bool is_rmb)
1890 {
1891         struct smc_buf_desc *buf_desc, *bf;
1892         int rc = 0;
1893
1894         mutex_lock(lock);
1895         list_for_each_entry_safe(buf_desc, bf, lst, list) {
1896                 if (!buf_desc->used)
1897                         continue;
1898                 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1899                 if (rc)
1900                         goto out;
1901         }
1902 out:
1903         mutex_unlock(lock);
1904         return rc;
1905 }
1906
1907 /* map all used buffers of lgr for a new link */
1908 int smcr_buf_map_lgr(struct smc_link *lnk)
1909 {
1910         struct smc_link_group *lgr = lnk->lgr;
1911         int i, rc = 0;
1912
1913         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1914                 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1915                                        &lgr->rmbs[i], true);
1916                 if (rc)
1917                         return rc;
1918                 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1919                                        &lgr->sndbufs[i], false);
1920                 if (rc)
1921                         return rc;
1922         }
1923         return 0;
1924 }
1925
1926 /* register all used buffers of lgr for a new link,
1927  * must be called under lgr->llc_conf_mutex lock
1928  */
1929 int smcr_buf_reg_lgr(struct smc_link *lnk)
1930 {
1931         struct smc_link_group *lgr = lnk->lgr;
1932         struct smc_buf_desc *buf_desc, *bf;
1933         int i, rc = 0;
1934
1935         mutex_lock(&lgr->rmbs_lock);
1936         for (i = 0; i < SMC_RMBE_SIZES; i++) {
1937                 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1938                         if (!buf_desc->used)
1939                                 continue;
1940                         rc = smcr_link_reg_rmb(lnk, buf_desc);
1941                         if (rc)
1942                                 goto out;
1943                 }
1944         }
1945 out:
1946         mutex_unlock(&lgr->rmbs_lock);
1947         return rc;
1948 }
1949
1950 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1951                                                 bool is_rmb, int bufsize)
1952 {
1953         struct smc_buf_desc *buf_desc;
1954
1955         /* try to alloc a new buffer */
1956         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1957         if (!buf_desc)
1958                 return ERR_PTR(-ENOMEM);
1959
1960         buf_desc->order = get_order(bufsize);
1961         buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1962                                       __GFP_NOMEMALLOC | __GFP_COMP |
1963                                       __GFP_NORETRY | __GFP_ZERO,
1964                                       buf_desc->order);
1965         if (!buf_desc->pages) {
1966                 kfree(buf_desc);
1967                 return ERR_PTR(-EAGAIN);
1968         }
1969         buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
1970         buf_desc->len = bufsize;
1971         return buf_desc;
1972 }
1973
1974 /* map buf_desc on all usable links,
1975  * unused buffers stay mapped as long as the link is up
1976  */
1977 static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1978                                      struct smc_buf_desc *buf_desc, bool is_rmb)
1979 {
1980         int i, rc = 0;
1981
1982         /* protect against parallel link reconfiguration */
1983         mutex_lock(&lgr->llc_conf_mutex);
1984         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1985                 struct smc_link *lnk = &lgr->lnk[i];
1986
1987                 if (!smc_link_usable(lnk))
1988                         continue;
1989                 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
1990                         rc = -ENOMEM;
1991                         goto out;
1992                 }
1993         }
1994 out:
1995         mutex_unlock(&lgr->llc_conf_mutex);
1996         return rc;
1997 }
1998
1999 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
2000                                                 bool is_dmb, int bufsize)
2001 {
2002         struct smc_buf_desc *buf_desc;
2003         int rc;
2004
2005         /* try to alloc a new DMB */
2006         buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2007         if (!buf_desc)
2008                 return ERR_PTR(-ENOMEM);
2009         if (is_dmb) {
2010                 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2011                 if (rc) {
2012                         kfree(buf_desc);
2013                         if (rc == -ENOMEM)
2014                                 return ERR_PTR(-EAGAIN);
2015                         if (rc == -ENOSPC)
2016                                 return ERR_PTR(-ENOSPC);
2017                         return ERR_PTR(-EIO);
2018                 }
2019                 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2020                 /* CDC header stored in buf. So, pretend it was smaller */
2021                 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2022         } else {
2023                 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2024                                              __GFP_NOWARN | __GFP_NORETRY |
2025                                              __GFP_NOMEMALLOC);
2026                 if (!buf_desc->cpu_addr) {
2027                         kfree(buf_desc);
2028                         return ERR_PTR(-EAGAIN);
2029                 }
2030                 buf_desc->len = bufsize;
2031         }
2032         return buf_desc;
2033 }
2034
2035 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2036 {
2037         struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2038         struct smc_connection *conn = &smc->conn;
2039         struct smc_link_group *lgr = conn->lgr;
2040         struct list_head *buf_list;
2041         int bufsize, bufsize_short;
2042         bool is_dgraded = false;
2043         struct mutex *lock;     /* lock buffer list */
2044         int sk_buf_size;
2045
2046         if (is_rmb)
2047                 /* use socket recv buffer size (w/o overhead) as start value */
2048                 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2049         else
2050                 /* use socket send buffer size (w/o overhead) as start value */
2051                 sk_buf_size = smc->sk.sk_sndbuf / 2;
2052
2053         for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb);
2054              bufsize_short >= 0; bufsize_short--) {
2055                 if (is_rmb) {
2056                         lock = &lgr->rmbs_lock;
2057                         buf_list = &lgr->rmbs[bufsize_short];
2058                 } else {
2059                         lock = &lgr->sndbufs_lock;
2060                         buf_list = &lgr->sndbufs[bufsize_short];
2061                 }
2062                 bufsize = smc_uncompress_bufsize(bufsize_short);
2063
2064                 /* check for reusable slot in the link group */
2065                 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2066                 if (buf_desc) {
2067                         SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2068                         SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
2069                         memset(buf_desc->cpu_addr, 0, bufsize);
2070                         break; /* found reusable slot */
2071                 }
2072
2073                 if (is_smcd)
2074                         buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2075                 else
2076                         buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2077
2078                 if (PTR_ERR(buf_desc) == -ENOMEM)
2079                         break;
2080                 if (IS_ERR(buf_desc)) {
2081                         if (!is_dgraded) {
2082                                 is_dgraded = true;
2083                                 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
2084                         }
2085                         continue;
2086                 }
2087
2088                 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
2089                 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2090                 buf_desc->used = 1;
2091                 mutex_lock(lock);
2092                 list_add(&buf_desc->list, buf_list);
2093                 mutex_unlock(lock);
2094                 break; /* found */
2095         }
2096
2097         if (IS_ERR(buf_desc))
2098                 return PTR_ERR(buf_desc);
2099
2100         if (!is_smcd) {
2101                 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2102                         smcr_buf_unuse(buf_desc, lgr);
2103                         return -ENOMEM;
2104                 }
2105         }
2106
2107         if (is_rmb) {
2108                 conn->rmb_desc = buf_desc;
2109                 conn->rmbe_size_short = bufsize_short;
2110                 smc->sk.sk_rcvbuf = bufsize * 2;
2111                 atomic_set(&conn->bytes_to_rcv, 0);
2112                 conn->rmbe_update_limit =
2113                         smc_rmb_wnd_update_limit(buf_desc->len);
2114                 if (is_smcd)
2115                         smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2116         } else {
2117                 conn->sndbuf_desc = buf_desc;
2118                 smc->sk.sk_sndbuf = bufsize * 2;
2119                 atomic_set(&conn->sndbuf_space, bufsize);
2120         }
2121         return 0;
2122 }
2123
2124 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2125 {
2126         if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2127                 return;
2128         smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2129 }
2130
2131 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2132 {
2133         if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2134                 return;
2135         smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2136 }
2137
2138 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2139 {
2140         int i;
2141
2142         if (!conn->lgr || conn->lgr->is_smcd)
2143                 return;
2144         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2145                 if (!smc_link_active(&conn->lgr->lnk[i]))
2146                         continue;
2147                 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2148                                        DMA_FROM_DEVICE);
2149         }
2150 }
2151
2152 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2153 {
2154         int i;
2155
2156         if (!conn->lgr || conn->lgr->is_smcd)
2157                 return;
2158         for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2159                 if (!smc_link_active(&conn->lgr->lnk[i]))
2160                         continue;
2161                 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2162                                           DMA_FROM_DEVICE);
2163         }
2164 }
2165
2166 /* create the send and receive buffer for an SMC socket;
2167  * receive buffers are called RMBs;
2168  * (even though the SMC protocol allows more than one RMB-element per RMB,
2169  * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2170  * extra RMB for every connection in a link group
2171  */
2172 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2173 {
2174         int rc;
2175
2176         /* create send buffer */
2177         rc = __smc_buf_create(smc, is_smcd, false);
2178         if (rc)
2179                 return rc;
2180         /* create rmb */
2181         rc = __smc_buf_create(smc, is_smcd, true);
2182         if (rc) {
2183                 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2184                 list_del(&smc->conn.sndbuf_desc->list);
2185                 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2186                 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2187                 smc->conn.sndbuf_desc = NULL;
2188         }
2189         return rc;
2190 }
2191
2192 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2193 {
2194         int i;
2195
2196         for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2197                 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2198                         return i;
2199         }
2200         return -ENOSPC;
2201 }
2202
2203 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2204                                    u32 rkey)
2205 {
2206         int i;
2207
2208         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2209                 if (test_bit(i, lgr->rtokens_used_mask) &&
2210                     lgr->rtokens[i][lnk_idx].rkey == rkey)
2211                         return i;
2212         }
2213         return -ENOENT;
2214 }
2215
2216 /* set rtoken for a new link to an existing rmb */
2217 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2218                     __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2219 {
2220         int rtok_idx;
2221
2222         rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2223         if (rtok_idx == -ENOENT)
2224                 return;
2225         lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2226         lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2227 }
2228
2229 /* set rtoken for a new link whose link_id is given */
2230 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2231                      __be64 nw_vaddr, __be32 nw_rkey)
2232 {
2233         u64 dma_addr = be64_to_cpu(nw_vaddr);
2234         u32 rkey = ntohl(nw_rkey);
2235         bool found = false;
2236         int link_idx;
2237
2238         for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2239                 if (lgr->lnk[link_idx].link_id == link_id) {
2240                         found = true;
2241                         break;
2242                 }
2243         }
2244         if (!found)
2245                 return;
2246         lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2247         lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2248 }
2249
2250 /* add a new rtoken from peer */
2251 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2252 {
2253         struct smc_link_group *lgr = smc_get_lgr(lnk);
2254         u64 dma_addr = be64_to_cpu(nw_vaddr);
2255         u32 rkey = ntohl(nw_rkey);
2256         int i;
2257
2258         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2259                 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2260                     lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2261                     test_bit(i, lgr->rtokens_used_mask)) {
2262                         /* already in list */
2263                         return i;
2264                 }
2265         }
2266         i = smc_rmb_reserve_rtoken_idx(lgr);
2267         if (i < 0)
2268                 return i;
2269         lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2270         lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2271         return i;
2272 }
2273
2274 /* delete an rtoken from all links */
2275 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2276 {
2277         struct smc_link_group *lgr = smc_get_lgr(lnk);
2278         u32 rkey = ntohl(nw_rkey);
2279         int i, j;
2280
2281         for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2282                 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2283                     test_bit(i, lgr->rtokens_used_mask)) {
2284                         for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2285                                 lgr->rtokens[i][j].rkey = 0;
2286                                 lgr->rtokens[i][j].dma_addr = 0;
2287                         }
2288                         clear_bit(i, lgr->rtokens_used_mask);
2289                         return 0;
2290                 }
2291         }
2292         return -ENOENT;
2293 }
2294
2295 /* save rkey and dma_addr received from peer during clc handshake */
2296 int smc_rmb_rtoken_handling(struct smc_connection *conn,
2297                             struct smc_link *lnk,
2298                             struct smc_clc_msg_accept_confirm *clc)
2299 {
2300         conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2301                                           clc->r0.rmb_rkey);
2302         if (conn->rtoken_idx < 0)
2303                 return conn->rtoken_idx;
2304         return 0;
2305 }
2306
2307 static void smc_core_going_away(void)
2308 {
2309         struct smc_ib_device *smcibdev;
2310         struct smcd_dev *smcd;
2311
2312         mutex_lock(&smc_ib_devices.mutex);
2313         list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2314                 int i;
2315
2316                 for (i = 0; i < SMC_MAX_PORTS; i++)
2317                         set_bit(i, smcibdev->ports_going_away);
2318         }
2319         mutex_unlock(&smc_ib_devices.mutex);
2320
2321         mutex_lock(&smcd_dev_list.mutex);
2322         list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2323                 smcd->going_away = 1;
2324         }
2325         mutex_unlock(&smcd_dev_list.mutex);
2326 }
2327
2328 /* Clean up all SMC link groups */
2329 static void smc_lgrs_shutdown(void)
2330 {
2331         struct smcd_dev *smcd;
2332
2333         smc_core_going_away();
2334
2335         smc_smcr_terminate_all(NULL);
2336
2337         mutex_lock(&smcd_dev_list.mutex);
2338         list_for_each_entry(smcd, &smcd_dev_list.list, list)
2339                 smc_smcd_terminate_all(smcd);
2340         mutex_unlock(&smcd_dev_list.mutex);
2341 }
2342
2343 static int smc_core_reboot_event(struct notifier_block *this,
2344                                  unsigned long event, void *ptr)
2345 {
2346         smc_lgrs_shutdown();
2347         smc_ib_unregister_client();
2348         return 0;
2349 }
2350
2351 static struct notifier_block smc_reboot_notifier = {
2352         .notifier_call = smc_core_reboot_event,
2353 };
2354
2355 int __init smc_core_init(void)
2356 {
2357         return register_reboot_notifier(&smc_reboot_notifier);
2358 }
2359
2360 /* Called (from smc_exit) when module is removed */
2361 void smc_core_exit(void)
2362 {
2363         unregister_reboot_notifier(&smc_reboot_notifier);
2364         smc_lgrs_shutdown();
2365 }