1 // SPDX-License-Identifier: GPL-2.0
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
5 * Basic Transport Functions exploiting Infiniband API
7 * Copyright IBM Corp. 2016
9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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>
23 #include <rdma/ib_verbs.h>
24 #include <rdma/ib_cache.h>
33 #include "smc_close.h"
35 #include "smc_netlink.h"
36 #include "smc_stats.h"
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)
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),
48 static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
49 static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
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);
55 static void smc_link_down_work(struct work_struct *work);
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)
62 *lgr_lock = &lgr->smcd->lgr_lock;
63 return &lgr->smcd->lgr_list;
66 *lgr_lock = &smc_lgr_list.lock;
67 return &smc_lgr_list.list;
70 static void smc_ibdev_cnt_inc(struct smc_link *lnk)
72 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
75 static void smc_ibdev_cnt_dec(struct smc_link *lnk)
77 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
80 static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
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.
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);
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.
100 static void smc_lgr_add_alert_token(struct smc_connection *conn)
102 struct rb_node **link, *parent = NULL;
103 u32 token = conn->alert_token_local;
105 link = &conn->lgr->conns_all.rb_node;
107 struct smc_connection *cur = rb_entry(*link,
108 struct smc_connection, alert_node);
111 if (cur->alert_token_local > token)
112 link = &parent->rb_left;
114 link = &parent->rb_right;
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);
121 /* assign an SMC-R link to the connection */
122 static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
124 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
128 /* do link balancing */
129 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
130 struct smc_link *lnk = &conn->lgr->lnk[i];
132 if (lnk->state != expected || lnk->link_is_asym)
134 if (conn->lgr->role == SMC_CLNT) {
135 conn->lnk = lnk; /* temporary, SMC server assigns link*/
138 if (conn->lgr->conns_num % 2) {
139 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
140 struct smc_link *lnk2;
142 lnk2 = &conn->lgr->lnk[j];
143 if (lnk2->state == expected &&
144 !lnk2->link_is_asym) {
155 return SMC_CLC_DECL_NOACTLINK;
156 atomic_inc(&conn->lnk->conn_cnt);
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.
165 static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
167 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
168 static atomic_t nexttoken = ATOMIC_INIT(0);
171 if (!conn->lgr->is_smcd) {
172 rc = smcr_lgr_conn_assign_link(conn, first);
176 /* find a new alert_token_local value not yet used by some connection
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;
185 smc_lgr_add_alert_token(conn);
186 conn->lgr->conns_num++;
190 /* Unregister connection and reset the alert token of the given connection<
192 static void __smc_lgr_unregister_conn(struct smc_connection *conn)
194 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
195 struct smc_link_group *lgr = conn->lgr;
197 rb_erase(&conn->alert_node, &lgr->conns_all);
199 atomic_dec(&conn->lnk->conn_cnt);
201 conn->alert_token_local = 0;
202 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
205 /* Unregister connection from lgr
207 static void smc_lgr_unregister_conn(struct smc_connection *conn)
209 struct smc_link_group *lgr = conn->lgr;
213 write_lock_bh(&lgr->conns_lock);
214 if (conn->alert_token_local) {
215 __smc_lgr_unregister_conn(conn);
217 write_unlock_bh(&lgr->conns_lock);
221 int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
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;
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);
239 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
242 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
244 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
246 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
248 smc_clc_get_hostname(&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))
255 mutex_lock(&smcd_dev_list.mutex);
256 smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
257 struct smcd_dev, list);
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))
267 nla_nest_end(skb, attrs);
268 genlmsg_end(skb, nlh);
273 nla_nest_cancel(skb, attrs);
275 genlmsg_cancel(skb, nlh);
280 static int smc_nl_fill_lgr(struct smc_link_group *lgr,
282 struct netlink_callback *cb)
284 char smc_target[SMC_MAX_PNETID_LEN + 1];
285 struct nlattr *attrs;
287 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
291 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
293 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
295 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
297 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
299 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
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))
306 nla_nest_end(skb, attrs);
309 nla_nest_cancel(skb, attrs);
314 static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
315 struct smc_link *link,
317 struct netlink_callback *cb)
319 char smc_ibname[IB_DEVICE_NAME_MAX];
320 u8 smc_gid_target[41];
321 struct nlattr *attrs;
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);
331 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
335 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
337 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
339 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
340 atomic_read(&link->conn_cnt)))
342 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
344 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
346 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
347 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
349 memcpy(&link_uid, link->link_uid, sizeof(link_uid));
350 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
352 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
353 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
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))
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))
364 nla_nest_end(skb, attrs);
365 genlmsg_end(skb, nlh);
368 nla_nest_cancel(skb, attrs);
370 genlmsg_cancel(skb, nlh);
375 static int smc_nl_handle_lgr(struct smc_link_group *lgr,
377 struct netlink_callback *cb,
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);
388 if (smc_nl_fill_lgr(lgr, skb, cb))
391 genlmsg_end(skb, nlh);
394 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
395 if (!smc_link_usable(&lgr->lnk[i]))
397 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
404 genlmsg_cancel(skb, nlh);
409 static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
411 struct netlink_callback *cb,
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];
419 spin_lock_bh(&smc_lgr->lock);
420 list_for_each_entry(lgr, &smc_lgr->list, list) {
423 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
429 spin_unlock_bh(&smc_lgr->lock);
430 cb_ctx->pos[0] = num;
433 static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
435 struct netlink_callback *cb)
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;
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);
450 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
454 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
456 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
459 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
462 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
464 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
466 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
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))
473 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_V2);
476 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
478 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
480 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
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))
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))
491 nla_nest_end(skb, v2_attrs);
492 nla_nest_end(skb, attrs);
493 genlmsg_end(skb, nlh);
497 nla_nest_cancel(skb, v2_attrs);
499 nla_nest_cancel(skb, attrs);
501 genlmsg_cancel(skb, nlh);
506 static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
508 struct netlink_callback *cb)
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];
515 spin_lock_bh(&dev->lgr_lock);
516 list_for_each_entry(lgr, &dev->lgr_list, list) {
521 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
528 spin_unlock_bh(&dev->lgr_lock);
529 cb_ctx->pos[1] = num;
533 static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
535 struct netlink_callback *cb)
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];
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))
548 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
555 mutex_unlock(&dev_list->mutex);
556 cb_ctx->pos[0] = num;
560 int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
562 bool list_links = false;
564 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
568 int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
570 bool list_links = true;
572 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
576 int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
578 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
582 void smc_lgr_cleanup_early(struct smc_connection *conn)
584 struct smc_link_group *lgr = conn->lgr;
585 struct list_head *lgr_list;
586 spinlock_t *lgr_lock;
592 lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
593 spin_lock_bh(lgr_lock);
594 /* do not use this link group for new connections */
595 if (!list_empty(lgr_list))
596 list_del_init(lgr_list);
597 spin_unlock_bh(lgr_lock);
598 __smc_lgr_terminate(lgr, true);
601 static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
605 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
606 struct smc_link *lnk = &lgr->lnk[i];
608 if (smc_link_usable(lnk))
609 lnk->state = SMC_LNK_INACTIVE;
611 wake_up_all(&lgr->llc_msg_waiter);
612 wake_up_all(&lgr->llc_flow_waiter);
615 static void smc_lgr_free(struct smc_link_group *lgr);
617 static void smc_lgr_free_work(struct work_struct *work)
619 struct smc_link_group *lgr = container_of(to_delayed_work(work),
620 struct smc_link_group,
622 spinlock_t *lgr_lock;
625 smc_lgr_list_head(lgr, &lgr_lock);
626 spin_lock_bh(lgr_lock);
628 spin_unlock_bh(lgr_lock);
631 read_lock_bh(&lgr->conns_lock);
632 conns = RB_EMPTY_ROOT(&lgr->conns_all);
633 read_unlock_bh(&lgr->conns_lock);
634 if (!conns) { /* number of lgr connections is no longer zero */
635 spin_unlock_bh(lgr_lock);
638 list_del_init(&lgr->list); /* remove from smc_lgr_list */
639 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
640 spin_unlock_bh(lgr_lock);
641 cancel_delayed_work(&lgr->free_work);
643 if (!lgr->is_smcd && !lgr->terminating)
644 smc_llc_send_link_delete_all(lgr, true,
645 SMC_LLC_DEL_PROG_INIT_TERM);
646 if (lgr->is_smcd && !lgr->terminating)
647 smc_ism_signal_shutdown(lgr);
649 smcr_lgr_link_deactivate_all(lgr);
653 static void smc_lgr_terminate_work(struct work_struct *work)
655 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
658 __smc_lgr_terminate(lgr, true);
661 /* return next unique link id for the lgr */
662 static u8 smcr_next_link_id(struct smc_link_group *lgr)
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)
681 static void smcr_copy_dev_info_to_link(struct smc_link *link)
683 struct smc_ib_device *smcibdev = link->smcibdev;
685 snprintf(link->ibname, sizeof(link->ibname), "%s",
686 smcibdev->ibdev->name);
687 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
690 int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
691 u8 link_idx, struct smc_init_info *ini)
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);
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);
714 get_random_bytes(rndvec, sizeof(rndvec));
715 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
717 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
718 ini->vlan_id, lnk->gid, &lnk->sgid_index);
721 rc = smc_llc_link_init(lnk);
724 rc = smc_wr_alloc_link_mem(lnk);
727 rc = smc_ib_create_protection_domain(lnk);
730 rc = smc_ib_create_queue_pair(lnk);
733 rc = smc_wr_create_link(lnk);
736 lnk->state = SMC_LNK_ACTIVATING;
740 smc_ib_destroy_queue_pair(lnk);
742 smc_ib_dealloc_protection_domain(lnk);
744 smc_wr_free_link_mem(lnk);
746 smc_llc_link_clear(lnk, false);
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);
757 /* create a new SMC link group */
758 static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
760 struct smc_link_group *lgr;
761 struct list_head *lgr_list;
762 struct smc_link *lnk;
763 spinlock_t *lgr_lock;
768 if (ini->is_smcd && ini->vlan_id) {
769 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
771 rc = SMC_CLC_DECL_ISMVLANERR;
776 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
778 rc = SMC_CLC_DECL_MEM;
781 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
782 SMC_LGR_ID_SIZE, &lgr->id);
787 lgr->is_smcd = ini->is_smcd;
789 lgr->terminating = 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]);
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;
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);
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,
820 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
822 smc_llc_lgr_init(lgr, smc);
824 link_idx = SMC_SINGLE_LINK;
825 lnk = &lgr->lnk[link_idx];
826 rc = smcr_link_init(lgr, lnk, link_idx, ini);
829 lgr_list = &smc_lgr_list.list;
830 lgr_lock = &smc_lgr_list.lock;
831 atomic_inc(&lgr_cnt);
834 spin_lock_bh(lgr_lock);
835 list_add_tail(&lgr->list, lgr_list);
836 spin_unlock_bh(lgr_lock);
840 destroy_workqueue(lgr->tx_wq);
844 if (ini->is_smcd && ini->vlan_id)
845 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
849 rc = SMC_CLC_DECL_MEM;
851 rc = SMC_CLC_DECL_INTERR;
856 static int smc_write_space(struct smc_connection *conn)
858 int buffer_len = conn->peer_rmbe_size;
859 union smc_host_cursor prod;
860 union smc_host_cursor cons;
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);
870 static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
871 struct smc_wr_buf *wr_buf)
873 struct smc_connection *conn = &smc->conn;
874 union smc_host_cursor cons, fin;
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);
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.
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);
894 smp_mb__before_atomic();
895 atomic_add(diff, &conn->sndbuf_space);
896 smp_mb__after_atomic();
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);
903 /* recalculate, value is used by tx_rdma_writes() */
904 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
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);
910 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
911 smc->sk.sk_data_ready(&smc->sk);
914 smc_wr_tx_put_slot(conn->lnk,
915 (struct smc_wr_tx_pend_priv *)pend);
920 void smc_switch_link_and_count(struct smc_connection *conn,
921 struct smc_link *to_lnk)
923 atomic_dec(&conn->lnk->conn_cnt);
925 atomic_inc(&conn->lnk->conn_cnt);
928 struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
929 struct smc_link *from_lnk, bool is_dev_err)
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;
939 /* link is inactive, wake up tx waiters */
940 smc_wr_wakeup_tx_wait(from_lnk);
942 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
943 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
945 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
946 from_lnk->ibport == lgr->lnk[i].ibport) {
949 to_lnk = &lgr->lnk[i];
953 smc_lgr_terminate_sched(lgr);
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)
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)
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);
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);
985 smcr_link_down_cond_sched(to_lnk);
988 /* avoid race with smcr_tx_sndbuf_nonempty() */
989 spin_lock_bh(&conn->send_lock);
990 smc_switch_link_and_count(conn, to_lnk);
991 rc = smc_switch_cursor(smc, pend, wr_buf);
992 spin_unlock_bh(&conn->send_lock);
995 smcr_link_down_cond_sched(to_lnk);
1000 read_unlock_bh(&lgr->conns_lock);
1004 static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
1005 struct smc_link_group *lgr)
1009 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1010 /* unregister rmb with peer */
1011 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1013 /* protect against smc_llc_cli_rkey_exchange() */
1014 mutex_lock(&lgr->llc_conf_mutex);
1015 smc_llc_do_delete_rkey(lgr, rmb_desc);
1016 rmb_desc->is_conf_rkey = false;
1017 mutex_unlock(&lgr->llc_conf_mutex);
1018 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1022 if (rmb_desc->is_reg_err) {
1023 /* buf registration failed, reuse not possible */
1024 mutex_lock(&lgr->rmbs_lock);
1025 list_del(&rmb_desc->list);
1026 mutex_unlock(&lgr->rmbs_lock);
1028 smc_buf_free(lgr, true, rmb_desc);
1034 static void smc_buf_unuse(struct smc_connection *conn,
1035 struct smc_link_group *lgr)
1037 if (conn->sndbuf_desc)
1038 conn->sndbuf_desc->used = 0;
1039 if (conn->rmb_desc && lgr->is_smcd)
1040 conn->rmb_desc->used = 0;
1041 else if (conn->rmb_desc)
1042 smcr_buf_unuse(conn->rmb_desc, lgr);
1045 /* remove a finished connection from its link group */
1046 void smc_conn_free(struct smc_connection *conn)
1048 struct smc_link_group *lgr = conn->lgr;
1053 if (!list_empty(&lgr->list))
1054 smc_ism_unset_conn(conn);
1055 tasklet_kill(&conn->rx_tsklet);
1057 smc_cdc_tx_dismiss_slots(conn);
1058 if (current_work() != &conn->abort_work)
1059 cancel_work_sync(&conn->abort_work);
1061 if (!list_empty(&lgr->list)) {
1062 smc_lgr_unregister_conn(conn);
1063 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1066 if (!lgr->conns_num)
1067 smc_lgr_schedule_free_work(lgr);
1070 /* unregister a link from a buf_desc */
1071 static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1072 struct smc_link *lnk)
1075 buf_desc->is_reg_mr[lnk->link_idx] = false;
1076 if (!buf_desc->is_map_ib[lnk->link_idx])
1079 if (buf_desc->mr_rx[lnk->link_idx]) {
1080 smc_ib_put_memory_region(
1081 buf_desc->mr_rx[lnk->link_idx]);
1082 buf_desc->mr_rx[lnk->link_idx] = NULL;
1084 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1086 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1088 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1089 buf_desc->is_map_ib[lnk->link_idx] = false;
1092 /* unmap all buffers of lgr for a deleted link */
1093 static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1095 struct smc_link_group *lgr = lnk->lgr;
1096 struct smc_buf_desc *buf_desc, *bf;
1099 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1100 mutex_lock(&lgr->rmbs_lock);
1101 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1102 smcr_buf_unmap_link(buf_desc, true, lnk);
1103 mutex_unlock(&lgr->rmbs_lock);
1104 mutex_lock(&lgr->sndbufs_lock);
1105 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1107 smcr_buf_unmap_link(buf_desc, false, lnk);
1108 mutex_unlock(&lgr->sndbufs_lock);
1112 static void smcr_rtoken_clear_link(struct smc_link *lnk)
1114 struct smc_link_group *lgr = lnk->lgr;
1117 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1118 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1119 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1123 /* must be called under lgr->llc_conf_mutex lock */
1124 void smcr_link_clear(struct smc_link *lnk, bool log)
1126 struct smc_ib_device *smcibdev;
1128 if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
1131 smc_llc_link_clear(lnk, log);
1132 smcr_buf_unmap_lgr(lnk);
1133 smcr_rtoken_clear_link(lnk);
1134 smc_ib_modify_qp_reset(lnk);
1135 smc_wr_free_link(lnk);
1136 smc_ib_destroy_queue_pair(lnk);
1137 smc_ib_dealloc_protection_domain(lnk);
1138 smc_wr_free_link_mem(lnk);
1139 smc_ibdev_cnt_dec(lnk);
1140 put_device(&lnk->smcibdev->ibdev->dev);
1141 smcibdev = lnk->smcibdev;
1142 memset(lnk, 0, sizeof(struct smc_link));
1143 lnk->state = SMC_LNK_UNUSED;
1144 if (!atomic_dec_return(&smcibdev->lnk_cnt))
1145 wake_up(&smcibdev->lnks_deleted);
1148 static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1149 struct smc_buf_desc *buf_desc)
1153 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1154 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
1156 if (buf_desc->pages)
1157 __free_pages(buf_desc->pages, buf_desc->order);
1161 static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1162 struct smc_buf_desc *buf_desc)
1165 /* restore original buf len */
1166 buf_desc->len += sizeof(struct smcd_cdc_msg);
1167 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1169 kfree(buf_desc->cpu_addr);
1174 static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1175 struct smc_buf_desc *buf_desc)
1178 smcd_buf_free(lgr, is_rmb, buf_desc);
1180 smcr_buf_free(lgr, is_rmb, buf_desc);
1183 static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
1185 struct smc_buf_desc *buf_desc, *bf_desc;
1186 struct list_head *buf_list;
1189 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1191 buf_list = &lgr->rmbs[i];
1193 buf_list = &lgr->sndbufs[i];
1194 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
1196 list_del(&buf_desc->list);
1197 smc_buf_free(lgr, is_rmb, buf_desc);
1202 static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1204 /* free send buffers */
1205 __smc_lgr_free_bufs(lgr, false);
1207 __smc_lgr_free_bufs(lgr, true);
1210 /* remove a link group */
1211 static void smc_lgr_free(struct smc_link_group *lgr)
1215 if (!lgr->is_smcd) {
1216 mutex_lock(&lgr->llc_conf_mutex);
1217 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1218 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
1219 smcr_link_clear(&lgr->lnk[i], false);
1221 mutex_unlock(&lgr->llc_conf_mutex);
1222 smc_llc_lgr_clear(lgr);
1225 smc_lgr_free_bufs(lgr);
1226 destroy_workqueue(lgr->tx_wq);
1228 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1229 put_device(&lgr->smcd->dev);
1230 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1231 wake_up(&lgr->smcd->lgrs_deleted);
1233 if (!atomic_dec_return(&lgr_cnt))
1234 wake_up(&lgrs_deleted);
1239 static void smc_sk_wake_ups(struct smc_sock *smc)
1241 smc->sk.sk_write_space(&smc->sk);
1242 smc->sk.sk_data_ready(&smc->sk);
1243 smc->sk.sk_state_change(&smc->sk);
1246 /* kill a connection */
1247 static void smc_conn_kill(struct smc_connection *conn, bool soft)
1249 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1251 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1252 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1254 smc_close_abort(conn);
1256 smc->sk.sk_err = ECONNABORTED;
1257 smc_sk_wake_ups(smc);
1258 if (conn->lgr->is_smcd) {
1259 smc_ism_unset_conn(conn);
1261 tasklet_kill(&conn->rx_tsklet);
1263 tasklet_unlock_wait(&conn->rx_tsklet);
1265 smc_cdc_tx_dismiss_slots(conn);
1267 smc_lgr_unregister_conn(conn);
1268 smc_close_active_abort(smc);
1271 static void smc_lgr_cleanup(struct smc_link_group *lgr)
1274 smc_ism_signal_shutdown(lgr);
1276 u32 rsn = lgr->llc_termination_rsn;
1279 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1280 smc_llc_send_link_delete_all(lgr, false, rsn);
1281 smcr_lgr_link_deactivate_all(lgr);
1285 /* terminate link group
1286 * @soft: true if link group shutdown can take its time
1287 * false if immediate link group shutdown is required
1289 static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
1291 struct smc_connection *conn;
1292 struct smc_sock *smc;
1293 struct rb_node *node;
1295 if (lgr->terminating)
1296 return; /* lgr already terminating */
1297 /* cancel free_work sync, will terminate when lgr->freeing is set */
1298 cancel_delayed_work_sync(&lgr->free_work);
1299 lgr->terminating = 1;
1301 /* kill remaining link group connections */
1302 read_lock_bh(&lgr->conns_lock);
1303 node = rb_first(&lgr->conns_all);
1305 read_unlock_bh(&lgr->conns_lock);
1306 conn = rb_entry(node, struct smc_connection, alert_node);
1307 smc = container_of(conn, struct smc_sock, conn);
1308 sock_hold(&smc->sk); /* sock_put below */
1309 lock_sock(&smc->sk);
1310 smc_conn_kill(conn, soft);
1311 release_sock(&smc->sk);
1312 sock_put(&smc->sk); /* sock_hold above */
1313 read_lock_bh(&lgr->conns_lock);
1314 node = rb_first(&lgr->conns_all);
1316 read_unlock_bh(&lgr->conns_lock);
1317 smc_lgr_cleanup(lgr);
1321 /* unlink link group and schedule termination */
1322 void smc_lgr_terminate_sched(struct smc_link_group *lgr)
1324 spinlock_t *lgr_lock;
1326 smc_lgr_list_head(lgr, &lgr_lock);
1327 spin_lock_bh(lgr_lock);
1328 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
1329 spin_unlock_bh(lgr_lock);
1330 return; /* lgr already terminating */
1332 list_del_init(&lgr->list);
1334 spin_unlock_bh(lgr_lock);
1335 schedule_work(&lgr->terminate_work);
1338 /* Called when peer lgr shutdown (regularly or abnormally) is received */
1339 void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
1341 struct smc_link_group *lgr, *l;
1342 LIST_HEAD(lgr_free_list);
1344 /* run common cleanup function and build free list */
1345 spin_lock_bh(&dev->lgr_lock);
1346 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1347 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
1348 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
1349 if (peer_gid) /* peer triggered termination */
1350 lgr->peer_shutdown = 1;
1351 list_move(&lgr->list, &lgr_free_list);
1355 spin_unlock_bh(&dev->lgr_lock);
1357 /* cancel the regular free workers and actually free lgrs */
1358 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1359 list_del_init(&lgr->list);
1360 schedule_work(&lgr->terminate_work);
1364 /* Called when an SMCD device is removed or the smc module is unloaded */
1365 void smc_smcd_terminate_all(struct smcd_dev *smcd)
1367 struct smc_link_group *lgr, *lg;
1368 LIST_HEAD(lgr_free_list);
1370 spin_lock_bh(&smcd->lgr_lock);
1371 list_splice_init(&smcd->lgr_list, &lgr_free_list);
1372 list_for_each_entry(lgr, &lgr_free_list, list)
1374 spin_unlock_bh(&smcd->lgr_lock);
1376 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1377 list_del_init(&lgr->list);
1378 __smc_lgr_terminate(lgr, false);
1381 if (atomic_read(&smcd->lgr_cnt))
1382 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
1385 /* Called when an SMCR device is removed or the smc module is unloaded.
1386 * If smcibdev is given, all SMCR link groups using this device are terminated.
1387 * If smcibdev is NULL, all SMCR link groups are terminated.
1389 void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1391 struct smc_link_group *lgr, *lg;
1392 LIST_HEAD(lgr_free_list);
1395 spin_lock_bh(&smc_lgr_list.lock);
1397 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1398 list_for_each_entry(lgr, &lgr_free_list, list)
1401 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
1402 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1403 if (lgr->lnk[i].smcibdev == smcibdev)
1404 smcr_link_down_cond_sched(&lgr->lnk[i]);
1408 spin_unlock_bh(&smc_lgr_list.lock);
1410 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1411 list_del_init(&lgr->list);
1412 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
1413 __smc_lgr_terminate(lgr, false);
1417 if (atomic_read(&smcibdev->lnk_cnt))
1418 wait_event(smcibdev->lnks_deleted,
1419 !atomic_read(&smcibdev->lnk_cnt));
1421 if (atomic_read(&lgr_cnt))
1422 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1426 /* set new lgr type and clear all asymmetric link tagging */
1427 void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1429 char *lgr_type = "";
1432 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1433 if (smc_link_usable(&lgr->lnk[i]))
1434 lgr->lnk[i].link_is_asym = false;
1435 if (lgr->type == new_type)
1437 lgr->type = new_type;
1439 switch (lgr->type) {
1443 case SMC_LGR_SINGLE:
1444 lgr_type = "SINGLE";
1446 case SMC_LGR_SYMMETRIC:
1447 lgr_type = "SYMMETRIC";
1449 case SMC_LGR_ASYMMETRIC_PEER:
1450 lgr_type = "ASYMMETRIC_PEER";
1452 case SMC_LGR_ASYMMETRIC_LOCAL:
1453 lgr_type = "ASYMMETRIC_LOCAL";
1456 pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1457 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1458 lgr_type, lgr->pnet_id);
1461 /* set new lgr type and tag a link as asymmetric */
1462 void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1463 enum smc_lgr_type new_type, int asym_lnk_idx)
1465 smcr_lgr_set_type(lgr, new_type);
1466 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1469 /* abort connection, abort_work scheduled from tasklet context */
1470 static void smc_conn_abort_work(struct work_struct *work)
1472 struct smc_connection *conn = container_of(work,
1473 struct smc_connection,
1475 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1477 smc_conn_kill(conn, true);
1478 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1481 void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1483 struct smc_link_group *lgr, *n;
1485 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1486 struct smc_link *link;
1488 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1489 SMC_MAX_PNETID_LEN) ||
1490 lgr->type == SMC_LGR_SYMMETRIC ||
1491 lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1494 /* trigger local add link processing */
1495 link = smc_llc_usable_link(lgr);
1497 smc_llc_add_link_local(link);
1501 /* link is down - switch connections to alternate link,
1502 * must be called under lgr->llc_conf_mutex lock
1504 static void smcr_link_down(struct smc_link *lnk)
1506 struct smc_link_group *lgr = lnk->lgr;
1507 struct smc_link *to_lnk;
1510 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1513 smc_ib_modify_qp_reset(lnk);
1514 to_lnk = smc_switch_conns(lgr, lnk, true);
1515 if (!to_lnk) { /* no backup link available */
1516 smcr_link_clear(lnk, true);
1519 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
1520 del_link_id = lnk->link_id;
1522 if (lgr->role == SMC_SERV) {
1523 /* trigger local delete link processing */
1524 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
1526 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1527 /* another llc task is ongoing */
1528 mutex_unlock(&lgr->llc_conf_mutex);
1529 wait_event_timeout(lgr->llc_flow_waiter,
1530 (list_empty(&lgr->list) ||
1531 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
1533 mutex_lock(&lgr->llc_conf_mutex);
1535 if (!list_empty(&lgr->list)) {
1536 smc_llc_send_delete_link(to_lnk, del_link_id,
1538 SMC_LLC_DEL_LOST_PATH);
1539 smcr_link_clear(lnk, true);
1541 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
1545 /* must be called under lgr->llc_conf_mutex lock */
1546 void smcr_link_down_cond(struct smc_link *lnk)
1548 if (smc_link_downing(&lnk->state))
1549 smcr_link_down(lnk);
1552 /* will get the lgr->llc_conf_mutex lock */
1553 void smcr_link_down_cond_sched(struct smc_link *lnk)
1555 if (smc_link_downing(&lnk->state))
1556 schedule_work(&lnk->link_down_wrk);
1559 void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1561 struct smc_link_group *lgr, *n;
1564 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1565 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1566 SMC_MAX_PNETID_LEN))
1567 continue; /* lgr is not affected */
1568 if (list_empty(&lgr->list))
1570 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1571 struct smc_link *lnk = &lgr->lnk[i];
1573 if (smc_link_usable(lnk) &&
1574 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1575 smcr_link_down_cond_sched(lnk);
1580 static void smc_link_down_work(struct work_struct *work)
1582 struct smc_link *link = container_of(work, struct smc_link,
1584 struct smc_link_group *lgr = link->lgr;
1586 if (list_empty(&lgr->list))
1588 wake_up_all(&lgr->llc_msg_waiter);
1589 mutex_lock(&lgr->llc_conf_mutex);
1590 smcr_link_down(link);
1591 mutex_unlock(&lgr->llc_conf_mutex);
1594 /* Determine vlan of internal TCP socket.
1595 * @vlan_id: address to store the determined vlan id into
1597 int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
1599 struct dst_entry *dst = sk_dst_get(clcsock->sk);
1600 struct net_device *ndev;
1601 int i, nest_lvl, rc = 0;
1614 if (is_vlan_dev(ndev)) {
1615 ini->vlan_id = vlan_dev_vlan_id(ndev);
1620 nest_lvl = ndev->lower_level;
1621 for (i = 0; i < nest_lvl; i++) {
1622 struct list_head *lower = &ndev->adj_list.lower;
1624 if (list_empty(lower))
1626 lower = lower->next;
1627 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
1628 if (is_vlan_dev(ndev)) {
1629 ini->vlan_id = vlan_dev_vlan_id(ndev);
1641 static bool smcr_lgr_match(struct smc_link_group *lgr,
1642 struct smc_clc_msg_local *lcl,
1643 enum smc_lgr_role role, u32 clcqpn)
1647 if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1651 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1652 if (!smc_link_active(&lgr->lnk[i]))
1654 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1655 !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1656 !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1662 static bool smcd_lgr_match(struct smc_link_group *lgr,
1663 struct smcd_dev *smcismdev, u64 peer_gid)
1665 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
1668 /* create a new SMC connection (and a new link group if necessary) */
1669 int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
1671 struct smc_connection *conn = &smc->conn;
1672 struct list_head *lgr_list;
1673 struct smc_link_group *lgr;
1674 enum smc_lgr_role role;
1675 spinlock_t *lgr_lock;
1678 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
1680 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
1682 ini->first_contact_local = 1;
1683 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
1684 if (role == SMC_CLNT && ini->first_contact_peer)
1685 /* create new link group as well */
1688 /* determine if an existing link group can be reused */
1689 spin_lock_bh(lgr_lock);
1690 list_for_each_entry(lgr, lgr_list, list) {
1691 write_lock_bh(&lgr->conns_lock);
1693 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1694 ini->ism_peer_gid[ini->ism_selected]) :
1695 smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
1697 (ini->smcd_version == SMC_V2 ||
1698 lgr->vlan_id == ini->vlan_id) &&
1699 (role == SMC_CLNT || ini->is_smcd ||
1700 lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
1701 /* link group found */
1702 ini->first_contact_local = 0;
1704 rc = smc_lgr_register_conn(conn, false);
1705 write_unlock_bh(&lgr->conns_lock);
1706 if (!rc && delayed_work_pending(&lgr->free_work))
1707 cancel_delayed_work(&lgr->free_work);
1710 write_unlock_bh(&lgr->conns_lock);
1712 spin_unlock_bh(lgr_lock);
1716 if (role == SMC_CLNT && !ini->first_contact_peer &&
1717 ini->first_contact_local) {
1718 /* Server reuses a link group, but Client wants to start
1720 * send out_of_sync decline, reason synchr. error
1722 return SMC_CLC_DECL_SYNCERR;
1726 if (ini->first_contact_local) {
1727 rc = smc_lgr_create(smc, ini);
1731 write_lock_bh(&lgr->conns_lock);
1732 rc = smc_lgr_register_conn(conn, true);
1733 write_unlock_bh(&lgr->conns_lock);
1737 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
1738 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
1739 conn->urg_state = SMC_URG_READ;
1740 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
1742 conn->rx_off = sizeof(struct smcd_cdc_msg);
1743 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
1747 #ifndef KERNEL_HAS_ATOMIC64
1748 spin_lock_init(&conn->acurs_lock);
1755 #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1756 #define SMCR_RMBE_SIZES 5 /* 0 -> 16KB, 1 -> 32KB, .. 5 -> 512KB */
1758 /* convert the RMB size into the compressed notation (minimum 16K, see
1759 * SMCD/R_DMBE_SIZES.
1760 * In contrast to plain ilog2, this rounds towards the next power of 2,
1761 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1763 static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
1765 const unsigned int max_scat = SG_MAX_SINGLE_ALLOC * PAGE_SIZE;
1768 if (size <= SMC_BUF_MIN_SIZE)
1771 size = (size - 1) >> 14; /* convert to 16K multiple */
1772 compressed = min_t(u8, ilog2(size) + 1,
1773 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES);
1775 if (!is_smcd && is_rmb)
1776 /* RMBs are backed by & limited to max size of scatterlists */
1777 compressed = min_t(u8, compressed, ilog2(max_scat >> 14));
1782 /* convert the RMB size from compressed notation into integer */
1783 int smc_uncompress_bufsize(u8 compressed)
1787 size = 0x00000001 << (((int)compressed) + 14);
1791 /* try to reuse a sndbuf or rmb description slot for a certain
1792 * buffer size; if not available, return NULL
1794 static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
1796 struct list_head *buf_list)
1798 struct smc_buf_desc *buf_slot;
1801 list_for_each_entry(buf_slot, buf_list, list) {
1802 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
1811 /* one of the conditions for announcing a receiver's current window size is
1812 * that it "results in a minimum increase in the window size of 10% of the
1813 * receive buffer space" [RFC7609]
1815 static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1817 return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1820 /* map an rmb buf to a link */
1821 static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1822 struct smc_link *lnk)
1826 if (buf_desc->is_map_ib[lnk->link_idx])
1829 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1832 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1833 buf_desc->cpu_addr, buf_desc->len);
1835 /* map sg table to DMA address */
1836 rc = smc_ib_buf_map_sg(lnk, buf_desc,
1837 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1838 /* SMC protocol depends on mapping to one DMA address only */
1844 /* create a new memory region for the RMB */
1846 rc = smc_ib_get_memory_region(lnk->roce_pd,
1847 IB_ACCESS_REMOTE_WRITE |
1848 IB_ACCESS_LOCAL_WRITE,
1849 buf_desc, lnk->link_idx);
1852 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1854 buf_desc->is_map_ib[lnk->link_idx] = true;
1858 smc_ib_buf_unmap_sg(lnk, buf_desc,
1859 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1861 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1865 /* register a new rmb on IB device,
1866 * must be called under lgr->llc_conf_mutex lock
1868 int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1870 if (list_empty(&link->lgr->list))
1872 if (!rmb_desc->is_reg_mr[link->link_idx]) {
1873 /* register memory region for new rmb */
1874 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1875 rmb_desc->is_reg_err = true;
1878 rmb_desc->is_reg_mr[link->link_idx] = true;
1883 static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1884 struct list_head *lst, bool is_rmb)
1886 struct smc_buf_desc *buf_desc, *bf;
1890 list_for_each_entry_safe(buf_desc, bf, lst, list) {
1891 if (!buf_desc->used)
1893 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1902 /* map all used buffers of lgr for a new link */
1903 int smcr_buf_map_lgr(struct smc_link *lnk)
1905 struct smc_link_group *lgr = lnk->lgr;
1908 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1909 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1910 &lgr->rmbs[i], true);
1913 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1914 &lgr->sndbufs[i], false);
1921 /* register all used buffers of lgr for a new link,
1922 * must be called under lgr->llc_conf_mutex lock
1924 int smcr_buf_reg_lgr(struct smc_link *lnk)
1926 struct smc_link_group *lgr = lnk->lgr;
1927 struct smc_buf_desc *buf_desc, *bf;
1930 mutex_lock(&lgr->rmbs_lock);
1931 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1932 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1933 if (!buf_desc->used)
1935 rc = smcr_link_reg_rmb(lnk, buf_desc);
1941 mutex_unlock(&lgr->rmbs_lock);
1945 static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1946 bool is_rmb, int bufsize)
1948 struct smc_buf_desc *buf_desc;
1950 /* try to alloc a new buffer */
1951 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1953 return ERR_PTR(-ENOMEM);
1955 buf_desc->order = get_order(bufsize);
1956 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1957 __GFP_NOMEMALLOC | __GFP_COMP |
1958 __GFP_NORETRY | __GFP_ZERO,
1960 if (!buf_desc->pages) {
1962 return ERR_PTR(-EAGAIN);
1964 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
1965 buf_desc->len = bufsize;
1969 /* map buf_desc on all usable links,
1970 * unused buffers stay mapped as long as the link is up
1972 static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1973 struct smc_buf_desc *buf_desc, bool is_rmb)
1977 /* protect against parallel link reconfiguration */
1978 mutex_lock(&lgr->llc_conf_mutex);
1979 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1980 struct smc_link *lnk = &lgr->lnk[i];
1982 if (!smc_link_usable(lnk))
1984 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
1990 mutex_unlock(&lgr->llc_conf_mutex);
1994 static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
1995 bool is_dmb, int bufsize)
1997 struct smc_buf_desc *buf_desc;
2000 /* try to alloc a new DMB */
2001 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2003 return ERR_PTR(-ENOMEM);
2005 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2009 return ERR_PTR(-EAGAIN);
2011 return ERR_PTR(-ENOSPC);
2012 return ERR_PTR(-EIO);
2014 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2015 /* CDC header stored in buf. So, pretend it was smaller */
2016 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
2018 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2019 __GFP_NOWARN | __GFP_NORETRY |
2021 if (!buf_desc->cpu_addr) {
2023 return ERR_PTR(-EAGAIN);
2025 buf_desc->len = bufsize;
2030 static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
2032 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
2033 struct smc_connection *conn = &smc->conn;
2034 struct smc_link_group *lgr = conn->lgr;
2035 struct list_head *buf_list;
2036 int bufsize, bufsize_short;
2037 bool is_dgraded = false;
2038 struct mutex *lock; /* lock buffer list */
2042 /* use socket recv buffer size (w/o overhead) as start value */
2043 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2045 /* use socket send buffer size (w/o overhead) as start value */
2046 sk_buf_size = smc->sk.sk_sndbuf / 2;
2048 for (bufsize_short = smc_compress_bufsize(sk_buf_size, is_smcd, is_rmb);
2049 bufsize_short >= 0; bufsize_short--) {
2051 lock = &lgr->rmbs_lock;
2052 buf_list = &lgr->rmbs[bufsize_short];
2054 lock = &lgr->sndbufs_lock;
2055 buf_list = &lgr->sndbufs[bufsize_short];
2057 bufsize = smc_uncompress_bufsize(bufsize_short);
2059 /* check for reusable slot in the link group */
2060 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
2062 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2063 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
2064 memset(buf_desc->cpu_addr, 0, bufsize);
2065 break; /* found reusable slot */
2069 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2071 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2073 if (PTR_ERR(buf_desc) == -ENOMEM)
2075 if (IS_ERR(buf_desc)) {
2078 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
2083 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
2084 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, bufsize);
2087 list_add(&buf_desc->list, buf_list);
2092 if (IS_ERR(buf_desc))
2093 return PTR_ERR(buf_desc);
2096 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
2097 smcr_buf_unuse(buf_desc, lgr);
2103 conn->rmb_desc = buf_desc;
2104 conn->rmbe_size_short = bufsize_short;
2105 smc->sk.sk_rcvbuf = bufsize * 2;
2106 atomic_set(&conn->bytes_to_rcv, 0);
2107 conn->rmbe_update_limit =
2108 smc_rmb_wnd_update_limit(buf_desc->len);
2110 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
2112 conn->sndbuf_desc = buf_desc;
2113 smc->sk.sk_sndbuf = bufsize * 2;
2114 atomic_set(&conn->sndbuf_space, bufsize);
2119 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2121 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2123 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2126 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2128 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
2130 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
2133 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2137 if (!conn->lgr || conn->lgr->is_smcd)
2139 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2140 if (!smc_link_active(&conn->lgr->lnk[i]))
2142 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2147 void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2151 if (!conn->lgr || conn->lgr->is_smcd)
2153 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2154 if (!smc_link_active(&conn->lgr->lnk[i]))
2156 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2161 /* create the send and receive buffer for an SMC socket;
2162 * receive buffers are called RMBs;
2163 * (even though the SMC protocol allows more than one RMB-element per RMB,
2164 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2165 * extra RMB for every connection in a link group
2167 int smc_buf_create(struct smc_sock *smc, bool is_smcd)
2171 /* create send buffer */
2172 rc = __smc_buf_create(smc, is_smcd, false);
2176 rc = __smc_buf_create(smc, is_smcd, true);
2178 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2179 list_del(&smc->conn.sndbuf_desc->list);
2180 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
2181 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
2182 smc->conn.sndbuf_desc = NULL;
2187 static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2191 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2192 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2198 static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2203 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2204 if (test_bit(i, lgr->rtokens_used_mask) &&
2205 lgr->rtokens[i][lnk_idx].rkey == rkey)
2211 /* set rtoken for a new link to an existing rmb */
2212 void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2213 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2217 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2218 if (rtok_idx == -ENOENT)
2220 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2221 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2224 /* set rtoken for a new link whose link_id is given */
2225 void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2226 __be64 nw_vaddr, __be32 nw_rkey)
2228 u64 dma_addr = be64_to_cpu(nw_vaddr);
2229 u32 rkey = ntohl(nw_rkey);
2233 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2234 if (lgr->lnk[link_idx].link_id == link_id) {
2241 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2242 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2245 /* add a new rtoken from peer */
2246 int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
2248 struct smc_link_group *lgr = smc_get_lgr(lnk);
2249 u64 dma_addr = be64_to_cpu(nw_vaddr);
2250 u32 rkey = ntohl(nw_rkey);
2253 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2254 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2255 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
2256 test_bit(i, lgr->rtokens_used_mask)) {
2257 /* already in list */
2261 i = smc_rmb_reserve_rtoken_idx(lgr);
2264 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2265 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
2269 /* delete an rtoken from all links */
2270 int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
2272 struct smc_link_group *lgr = smc_get_lgr(lnk);
2273 u32 rkey = ntohl(nw_rkey);
2276 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2277 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2278 test_bit(i, lgr->rtokens_used_mask)) {
2279 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2280 lgr->rtokens[i][j].rkey = 0;
2281 lgr->rtokens[i][j].dma_addr = 0;
2283 clear_bit(i, lgr->rtokens_used_mask);
2290 /* save rkey and dma_addr received from peer during clc handshake */
2291 int smc_rmb_rtoken_handling(struct smc_connection *conn,
2292 struct smc_link *lnk,
2293 struct smc_clc_msg_accept_confirm *clc)
2295 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2297 if (conn->rtoken_idx < 0)
2298 return conn->rtoken_idx;
2302 static void smc_core_going_away(void)
2304 struct smc_ib_device *smcibdev;
2305 struct smcd_dev *smcd;
2307 mutex_lock(&smc_ib_devices.mutex);
2308 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2311 for (i = 0; i < SMC_MAX_PORTS; i++)
2312 set_bit(i, smcibdev->ports_going_away);
2314 mutex_unlock(&smc_ib_devices.mutex);
2316 mutex_lock(&smcd_dev_list.mutex);
2317 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2318 smcd->going_away = 1;
2320 mutex_unlock(&smcd_dev_list.mutex);
2323 /* Clean up all SMC link groups */
2324 static void smc_lgrs_shutdown(void)
2326 struct smcd_dev *smcd;
2328 smc_core_going_away();
2330 smc_smcr_terminate_all(NULL);
2332 mutex_lock(&smcd_dev_list.mutex);
2333 list_for_each_entry(smcd, &smcd_dev_list.list, list)
2334 smc_smcd_terminate_all(smcd);
2335 mutex_unlock(&smcd_dev_list.mutex);
2338 static int smc_core_reboot_event(struct notifier_block *this,
2339 unsigned long event, void *ptr)
2341 smc_lgrs_shutdown();
2342 smc_ib_unregister_client();
2346 static struct notifier_block smc_reboot_notifier = {
2347 .notifier_call = smc_core_reboot_event,
2350 int __init smc_core_init(void)
2352 return register_reboot_notifier(&smc_reboot_notifier);
2355 /* Called (from smc_exit) when module is removed */
2356 void smc_core_exit(void)
2358 unregister_reboot_notifier(&smc_reboot_notifier);
2359 smc_lgrs_shutdown();