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Merge remote-tracking branch 'asoc/for-5.11' into asoc-linus
[linux.git] / net / smc / smc_core.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
0cfdd8f9
UB		 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 <[email protected]>
10 */
11
12#include <linux/socket.h>
13#include <linux/if_vlan.h>
14#include <linux/random.h>
15#include <linux/workqueue.h>
6dabd405 16#include <linux/wait.h>
a33a803c 17#include <linux/reboot.h>
92f3cb0e 18#include <linux/mutex.h>
099b990b
GG		 19#include <linux/list.h>
20#include <linux/smc.h>
0cfdd8f9
UB		 21#include <net/tcp.h>
22#include <net/sock.h>
23#include <rdma/ib_verbs.h>
ddb457c6 24#include <rdma/ib_cache.h>
0cfdd8f9
UB		 25
26#include "smc.h"
27#include "smc_clc.h"
28#include "smc_core.h"
29#include "smc_ib.h"
f38ba179 30#include "smc_wr.h"
9bf9abea 31#include "smc_llc.h"
5f08318f 32#include "smc_cdc.h"
b38d7324 33#include "smc_close.h"
c6ba7c9b 34#include "smc_ism.h"
099b990b 35#include "smc_netlink.h"
0cfdd8f9 36
5bc11ddb
UB		 37#define SMC_LGR_NUM_INCR 256
38#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
7f58a1ad 39#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
0cfdd8f9 40
a3db10ef 41struct smc_lgr_list smc_lgr_list = { /* established link groups */
9fda3510
HW		 42 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
43 .list = LIST_HEAD_INIT(smc_lgr_list.list),
44 .num = 0,
45};
9bf9abea 46
29115cef 47static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
6dabd405
UB		 48static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
49
6511aad3
HW		 50static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
51 struct smc_buf_desc *buf_desc);
5f78fe96 52static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
a6920d1d 53
541afa10 54static void smc_link_down_work(struct work_struct *work);
1f90a05d 55
a0a62ee1
UB		 56/* return head of link group list and its lock for a given link group */
57static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
58 spinlock_t **lgr_lock)
59{
60 if (lgr->is_smcd) {
61 *lgr_lock = &lgr->smcd->lgr_lock;
62 return &lgr->smcd->lgr_list;
63 }
64
65 *lgr_lock = &smc_lgr_list.lock;
66 return &smc_lgr_list.list;
67}
68
ddc99286
GG		 69static void smc_ibdev_cnt_inc(struct smc_link *lnk)
70{
71 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
72}
73
74static void smc_ibdev_cnt_dec(struct smc_link *lnk)
75{
76 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
77}
78
97cdbc42
KG		 79static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
80{
81 /* client link group creation always follows the server link group
82 * creation. For client use a somewhat higher removal delay time,
83 * otherwise there is a risk of out-of-sync link groups.
84 */
f9aab6f2 85 if (!lgr->freeing) {
8e316b9e
UB		 86 mod_delayed_work(system_wq, &lgr->free_work,
87 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
88 SMC_LGR_FREE_DELAY_CLNT :
89 SMC_LGR_FREE_DELAY_SERV);
90 }
97cdbc42
KG		 91}
92
0cfdd8f9
UB		 93/* Register connection's alert token in our lookup structure.
94 * To use rbtrees we have to implement our own insert core.
95 * Requires @conns_lock
96 * @smc connection to register
97 * Returns 0 on success, != otherwise.
98 */
99static void smc_lgr_add_alert_token(struct smc_connection *conn)
100{
101 struct rb_node **link, *parent = NULL;
102 u32 token = conn->alert_token_local;
103
104 link = &conn->lgr->conns_all.rb_node;
105 while (*link) {
106 struct smc_connection *cur = rb_entry(*link,
107 struct smc_connection, alert_node);
108
109 parent = *link;
110 if (cur->alert_token_local > token)
111 link = &parent->rb_left;
112 else
113 link = &parent->rb_right;
114 }
115 /* Put the new node there */
116 rb_link_node(&conn->alert_node, parent, link);
117 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
118}
119
56bc3b20
KG		 120/* assign an SMC-R link to the connection */
121static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
122{
123 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
124 SMC_LNK_ACTIVE;
125 int i, j;
126
127 /* do link balancing */
128 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
129 struct smc_link *lnk = &conn->lgr->lnk[i];
130
ad6c111b 131 if (lnk->state != expected || lnk->link_is_asym)
56bc3b20
KG		 132 continue;
133 if (conn->lgr->role == SMC_CLNT) {
134 conn->lnk = lnk; /* temporary, SMC server assigns link*/
135 break;
136 }
137 if (conn->lgr->conns_num % 2) {
138 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
139 struct smc_link *lnk2;
140
141 lnk2 = &conn->lgr->lnk[j];
ad6c111b
KG		 142 if (lnk2->state == expected &&
143 !lnk2->link_is_asym) {
56bc3b20
KG		 144 conn->lnk = lnk2;
145 break;
146 }
147 }
148 }
149 if (!conn->lnk)
150 conn->lnk = lnk;
151 break;
152 }
153 if (!conn->lnk)
154 return SMC_CLC_DECL_NOACTLINK;
07d51580 155 atomic_inc(&conn->lnk->conn_cnt);
56bc3b20
KG		 156 return 0;
157}
158
0cfdd8f9
UB		 159/* Register connection in link group by assigning an alert token
160 * registered in a search tree.
161 * Requires @conns_lock
162 * Note that '0' is a reserved value and not assigned.
163 */
56bc3b20 164static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
0cfdd8f9
UB		 165{
166 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
167 static atomic_t nexttoken = ATOMIC_INIT(0);
56bc3b20 168 int rc;
0cfdd8f9 169
56bc3b20
KG		 170 if (!conn->lgr->is_smcd) {
171 rc = smcr_lgr_conn_assign_link(conn, first);
172 if (rc)
173 return rc;
174 }
0cfdd8f9
UB		 175 /* find a new alert_token_local value not yet used by some connection
176 * in this link group
177 */
178 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
179 while (!conn->alert_token_local) {
180 conn->alert_token_local = atomic_inc_return(&nexttoken);
181 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
182 conn->alert_token_local = 0;
183 }
184 smc_lgr_add_alert_token(conn);
185 conn->lgr->conns_num++;
b9247544 186 return 0;
0cfdd8f9
UB		 187}
188
189/* Unregister connection and reset the alert token of the given connection<
190 */
191static void __smc_lgr_unregister_conn(struct smc_connection *conn)
192{
193 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
194 struct smc_link_group *lgr = conn->lgr;
195
196 rb_erase(&conn->alert_node, &lgr->conns_all);
07d51580
GG		 197 if (conn->lnk)
198 atomic_dec(&conn->lnk->conn_cnt);
0cfdd8f9
UB		 199 lgr->conns_num--;
200 conn->alert_token_local = 0;
0cfdd8f9
UB		 201 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
202}
203
fb692ec4 204/* Unregister connection from lgr
0cfdd8f9
UB		 205 */
206static void smc_lgr_unregister_conn(struct smc_connection *conn)
207{
208 struct smc_link_group *lgr = conn->lgr;
0cfdd8f9 209
77f838ac
KG		 210 if (!lgr)
211 return;
0cfdd8f9
UB		 212 write_lock_bh(&lgr->conns_lock);
213 if (conn->alert_token_local) {
0cfdd8f9
UB		 214 __smc_lgr_unregister_conn(conn);
215 }
216 write_unlock_bh(&lgr->conns_lock);
2a0674ff 217 conn->lgr = NULL;
0cfdd8f9
UB		 218}
219
099b990b
GG		 220int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
221{
222 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
223 char hostname[SMC_MAX_HOSTNAME_LEN + 1];
224 char smc_seid[SMC_MAX_EID_LEN + 1];
225 struct smcd_dev *smcd_dev;
226 struct nlattr *attrs;
227 u8 *seid = NULL;
228 u8 *host = NULL;
229 void *nlh;
230
231 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
232 &smc_gen_nl_family, NLM_F_MULTI,
233 SMC_NETLINK_GET_SYS_INFO);
234 if (!nlh)
235 goto errmsg;
236 if (cb_ctx->pos[0])
237 goto errout;
238 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
239 if (!attrs)
240 goto errout;
241 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
242 goto errattr;
243 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
244 goto errattr;
245 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
246 goto errattr;
247 smc_clc_get_hostname(&host);
248 if (host) {
25fe2c9c
JK		 249 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
250 hostname[SMC_MAX_HOSTNAME_LEN] = 0;
099b990b
GG		 251 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
252 goto errattr;
253 }
254 mutex_lock(&smcd_dev_list.mutex);
255 smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
256 struct smcd_dev, list);
257 if (smcd_dev)
258 smc_ism_get_system_eid(smcd_dev, &seid);
259 mutex_unlock(&smcd_dev_list.mutex);
260 if (seid && smc_ism_is_v2_capable()) {
8a446536
GG		 261 memcpy(smc_seid, seid, SMC_MAX_EID_LEN);
262 smc_seid[SMC_MAX_EID_LEN] = 0;
099b990b
GG		 263 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
264 goto errattr;
265 }
266 nla_nest_end(skb, attrs);
267 genlmsg_end(skb, nlh);
268 cb_ctx->pos[0] = 1;
269 return skb->len;
270
271errattr:
272 nla_nest_cancel(skb, attrs);
273errout:
274 genlmsg_cancel(skb, nlh);
275errmsg:
276 return skb->len;
277}
278
e9b8c845
GG		 279static int smc_nl_fill_lgr(struct smc_link_group *lgr,
280 struct sk_buff *skb,
281 struct netlink_callback *cb)
282{
283 char smc_target[SMC_MAX_PNETID_LEN + 1];
284 struct nlattr *attrs;
285
286 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
287 if (!attrs)
288 goto errout;
289
290 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
291 goto errattr;
292 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
293 goto errattr;
294 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
295 goto errattr;
296 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
297 goto errattr;
298 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
299 goto errattr;
8a446536
GG		 300 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
301 smc_target[SMC_MAX_PNETID_LEN] = 0;
e9b8c845
GG		 302 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
303 goto errattr;
304
305 nla_nest_end(skb, attrs);
306 return 0;
307errattr:
308 nla_nest_cancel(skb, attrs);
309errout:
310 return -EMSGSIZE;
311}
312
5a7e09d5
GG		 313static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
314 struct smc_link *link,
315 struct sk_buff *skb,
316 struct netlink_callback *cb)
317{
8a446536 318 char smc_ibname[IB_DEVICE_NAME_MAX];
5a7e09d5
GG		 319 u8 smc_gid_target[41];
320 struct nlattr *attrs;
321 u32 link_uid = 0;
322 void *nlh;
323
324 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
325 &smc_gen_nl_family, NLM_F_MULTI,
326 SMC_NETLINK_GET_LINK_SMCR);
327 if (!nlh)
328 goto errmsg;
329
330 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
331 if (!attrs)
332 goto errout;
333
334 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
335 goto errattr;
336 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
337 goto errattr;
338 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
339 atomic_read(&link->conn_cnt)))
340 goto errattr;
341 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
342 goto errattr;
343 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
344 goto errattr;
345 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
346 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
347 goto errattr;
348 memcpy(&link_uid, link->link_uid, sizeof(link_uid));
349 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
350 goto errattr;
351 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
352 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
353 goto errattr;
354 memset(smc_gid_target, 0, sizeof(smc_gid_target));
355 smc_gid_be16_convert(smc_gid_target, link->gid);
356 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
357 goto errattr;
358 memset(smc_gid_target, 0, sizeof(smc_gid_target));
359 smc_gid_be16_convert(smc_gid_target, link->peer_gid);
360 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
361 goto errattr;
362
363 nla_nest_end(skb, attrs);
364 genlmsg_end(skb, nlh);
365 return 0;
366errattr:
367 nla_nest_cancel(skb, attrs);
368errout:
369 genlmsg_cancel(skb, nlh);
370errmsg:
371 return -EMSGSIZE;
372}
373
e9b8c845
GG		 374static int smc_nl_handle_lgr(struct smc_link_group *lgr,
375 struct sk_buff *skb,
5a7e09d5
GG		 376 struct netlink_callback *cb,
377 bool list_links)
e9b8c845
GG		 378{
379 void *nlh;
5a7e09d5 380 int i;
e9b8c845
GG		 381
382 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
383 &smc_gen_nl_family, NLM_F_MULTI,
384 SMC_NETLINK_GET_LGR_SMCR);
385 if (!nlh)
386 goto errmsg;
387 if (smc_nl_fill_lgr(lgr, skb, cb))
388 goto errout;
389
390 genlmsg_end(skb, nlh);
5a7e09d5
GG		 391 if (!list_links)
392 goto out;
393 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
394 if (!smc_link_usable(&lgr->lnk[i]))
395 continue;
396 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
397 goto errout;
398 }
399out:
e9b8c845
GG		 400 return 0;
401
402errout:
403 genlmsg_cancel(skb, nlh);
404errmsg:
405 return -EMSGSIZE;
406}
407
408static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
409 struct sk_buff *skb,
5a7e09d5
GG		 410 struct netlink_callback *cb,
411 bool list_links)
e9b8c845
GG		 412{
413 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
414 struct smc_link_group *lgr;
415 int snum = cb_ctx->pos[0];
416 int num = 0;
417
418 spin_lock_bh(&smc_lgr->lock);
419 list_for_each_entry(lgr, &smc_lgr->list, list) {
420 if (num < snum)
421 goto next;
5a7e09d5 422 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
e9b8c845
GG		 423 goto errout;
424next:
425 num++;
426 }
427errout:
428 spin_unlock_bh(&smc_lgr->lock);
429 cb_ctx->pos[0] = num;
430}
431
8f9dde4b
GG		 432static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
433 struct sk_buff *skb,
434 struct netlink_callback *cb)
435{
436 char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
437 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
438 char smc_eid[SMC_MAX_EID_LEN + 1];
439 struct nlattr *v2_attrs;
440 struct nlattr *attrs;
441 void *nlh;
442
443 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
444 &smc_gen_nl_family, NLM_F_MULTI,
445 SMC_NETLINK_GET_LGR_SMCD);
446 if (!nlh)
447 goto errmsg;
448
449 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
450 if (!attrs)
451 goto errout;
452
453 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
454 goto errattr;
455 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
456 SMC_NLA_LGR_D_PAD))
457 goto errattr;
458 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
459 SMC_NLA_LGR_D_PAD))
460 goto errattr;
461 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
462 goto errattr;
463 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
464 goto errattr;
465 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
466 goto errattr;
8a446536
GG		 467 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
468 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
8f9dde4b
GG		 469 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
470 goto errattr;
471
472 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_V2);
473 if (!v2_attrs)
474 goto errattr;
475 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
476 goto errv2attr;
477 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
478 goto errv2attr;
479 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
480 goto errv2attr;
8a446536
GG		 481 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN);
482 smc_host[SMC_MAX_HOSTNAME_LEN] = 0;
8f9dde4b
GG		 483 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
484 goto errv2attr;
8a446536
GG		 485 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN);
486 smc_eid[SMC_MAX_EID_LEN] = 0;
8f9dde4b
GG		 487 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
488 goto errv2attr;
489
490 nla_nest_end(skb, v2_attrs);
491 nla_nest_end(skb, attrs);
492 genlmsg_end(skb, nlh);
493 return 0;
494
495errv2attr:
496 nla_nest_cancel(skb, v2_attrs);
497errattr:
498 nla_nest_cancel(skb, attrs);
499errout:
500 genlmsg_cancel(skb, nlh);
501errmsg:
502 return -EMSGSIZE;
503}
504
505static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
506 struct sk_buff *skb,
507 struct netlink_callback *cb)
508{
509 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
510 struct smc_link_group *lgr;
511 int snum = cb_ctx->pos[1];
512 int rc = 0, num = 0;
513
514 spin_lock_bh(&dev->lgr_lock);
515 list_for_each_entry(lgr, &dev->lgr_list, list) {
516 if (!lgr->is_smcd)
517 continue;
518 if (num < snum)
519 goto next;
520 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
521 if (rc)
522 goto errout;
523next:
524 num++;
525 }
526errout:
527 spin_unlock_bh(&dev->lgr_lock);
528 cb_ctx->pos[1] = num;
529 return rc;
530}
531
532static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
533 struct sk_buff *skb,
534 struct netlink_callback *cb)
535{
536 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
537 struct smcd_dev *smcd_dev;
538 int snum = cb_ctx->pos[0];
539 int rc = 0, num = 0;
540
541 mutex_lock(&dev_list->mutex);
542 list_for_each_entry(smcd_dev, &dev_list->list, list) {
543 if (list_empty(&smcd_dev->lgr_list))
544 continue;
545 if (num < snum)
546 goto next;
547 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
548 if (rc)
549 goto errout;
550next:
551 num++;
552 }
553errout:
554 mutex_unlock(&dev_list->mutex);
555 cb_ctx->pos[0] = num;
556 return rc;
557}
558
e9b8c845
GG		 559int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
560{
5a7e09d5
GG		 561 bool list_links = false;
562
563 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
564 return skb->len;
565}
566
567int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
568{
569 bool list_links = true;
570
571 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
e9b8c845
GG		 572 return skb->len;
573}
574
8f9dde4b
GG		 575int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
576{
577 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
578 return skb->len;
579}
580
51e3dfa8
UB		 581void smc_lgr_cleanup_early(struct smc_connection *conn)
582{
583 struct smc_link_group *lgr = conn->lgr;
9ec6bf19
KG		 584 struct list_head *lgr_list;
585 spinlock_t *lgr_lock;
51e3dfa8
UB		 586
587 if (!lgr)
588 return;
589
590 smc_conn_free(conn);
9ec6bf19
KG		 591 lgr_list = 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);
f9aab6f2 597 __smc_lgr_terminate(lgr, true);
51e3dfa8
UB		 598}
599
a52bcc91
KG		 600static 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 }
6778a6be
KG		 610 wake_up_all(&lgr->llc_msg_waiter);
611 wake_up_all(&lgr->llc_flow_waiter);
a52bcc91
KG		 612}
613
3f3f0e36
UB		 614static void smc_lgr_free(struct smc_link_group *lgr);
615
0cfdd8f9
UB		 616static 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);
a0a62ee1 621 spinlock_t *lgr_lock;
0cfdd8f9
UB		 622 bool conns;
623
a0a62ee1
UB		 624 smc_lgr_list_head(lgr, &lgr_lock);
625 spin_lock_bh(lgr_lock);
8e316b9e
UB		 626 if (lgr->freeing) {
627 spin_unlock_bh(lgr_lock);
628 return;
629 }
0cfdd8f9
UB		 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 */
a0a62ee1 634 spin_unlock_bh(lgr_lock);
0cfdd8f9
UB		 635 return;
636 }
8caa6544 637 list_del_init(&lgr->list); /* remove from smc_lgr_list */
8e316b9e
UB		 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);
0d18a0cb 641
f3811fd7
KG		 642 if (!lgr->is_smcd && !lgr->terminating)
643 smc_llc_send_link_delete_all(lgr, true,
644 SMC_LLC_DEL_PROG_INIT_TERM);
42bfba9e 645 if (lgr->is_smcd && !lgr->terminating)
8e316b9e 646 smc_ism_signal_shutdown(lgr);
a52bcc91
KG		 647 if (!lgr->is_smcd)
648 smcr_lgr_link_deactivate_all(lgr);
8e316b9e 649 smc_lgr_free(lgr);
0cfdd8f9
UB		 650}
651
f528ba24
UB		 652static 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
5f78fe96 657 __smc_lgr_terminate(lgr, true);
f528ba24
UB		 658}
659
026c381f
KG		 660/* return next unique link id for the lgr */
661static u8 smcr_next_link_id(struct smc_link_group *lgr)
662{
663 u8 link_id;
664 int i;
665
666 while (1) {
667 link_id = ++lgr->next_link_id;
668 if (!link_id) /* skip zero as link_id */
669 link_id = ++lgr->next_link_id;
670 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
d854fcbf 671 if (smc_link_usable(&lgr->lnk[i]) &&
026c381f
KG		 672 lgr->lnk[i].link_id == link_id)
673 continue;
674 }
675 break;
676 }
677 return link_id;
678}
679
6443b2f6
GG		 680static void smcr_copy_dev_info_to_link(struct smc_link *link)
681{
682 struct smc_ib_device *smcibdev = link->smcibdev;
683
684 snprintf(link->ibname, sizeof(link->ibname), "%s",
685 smcibdev->ibdev->name);
686 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
687}
688
336ba09f
KG		 689int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
690 u8 link_idx, struct smc_init_info *ini)
f3c1dedd
KG		 691{
692 u8 rndvec[3];
693 int rc;
694
695 get_device(&ini->ib_dev->ibdev->dev);
696 atomic_inc(&ini->ib_dev->lnk_cnt);
026c381f 697 lnk->link_id = smcr_next_link_id(lgr);
387707fd 698 lnk->lgr = lgr;
026c381f 699 lnk->link_idx = link_idx;
f3c1dedd
KG		 700 lnk->smcibdev = ini->ib_dev;
701 lnk->ibport = ini->ib_port;
ddc99286 702 smc_ibdev_cnt_inc(lnk);
6443b2f6 703 smcr_copy_dev_info_to_link(lnk);
f3c1dedd 704 lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
07d51580 705 atomic_set(&lnk->conn_cnt, 0);
45fa8da0 706 smc_llc_link_set_uid(lnk);
541afa10 707 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
f3c1dedd
KG		 708 if (!ini->ib_dev->initialized) {
709 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
710 if (rc)
711 goto out;
712 }
713 get_random_bytes(rndvec, sizeof(rndvec));
714 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
715 (rndvec[2] << 16);
716 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
717 ini->vlan_id, lnk->gid, &lnk->sgid_index);
718 if (rc)
719 goto out;
720 rc = smc_llc_link_init(lnk);
721 if (rc)
722 goto out;
723 rc = smc_wr_alloc_link_mem(lnk);
724 if (rc)
725 goto clear_llc_lnk;
726 rc = smc_ib_create_protection_domain(lnk);
727 if (rc)
728 goto free_link_mem;
729 rc = smc_ib_create_queue_pair(lnk);
730 if (rc)
731 goto dealloc_pd;
732 rc = smc_wr_create_link(lnk);
733 if (rc)
734 goto destroy_qp;
741a49a4 735 lnk->state = SMC_LNK_ACTIVATING;
f3c1dedd
KG		 736 return 0;
737
738destroy_qp:
739 smc_ib_destroy_queue_pair(lnk);
740dealloc_pd:
741 smc_ib_dealloc_protection_domain(lnk);
742free_link_mem:
743 smc_wr_free_link_mem(lnk);
744clear_llc_lnk:
0a99be43 745 smc_llc_link_clear(lnk, false);
f3c1dedd 746out:
ddc99286 747 smc_ibdev_cnt_dec(lnk);
f3c1dedd
KG		 748 put_device(&ini->ib_dev->ibdev->dev);
749 memset(lnk, 0, sizeof(struct smc_link));
d854fcbf 750 lnk->state = SMC_LNK_UNUSED;
f3c1dedd
KG		 751 if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
752 wake_up(&ini->ib_dev->lnks_deleted);
753 return rc;
754}
755
0cfdd8f9 756/* create a new SMC link group */
bc36d2fc 757static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
0cfdd8f9
UB		 758{
759 struct smc_link_group *lgr;
a2351c5d 760 struct list_head *lgr_list;
0cfdd8f9 761 struct smc_link *lnk;
a0a62ee1 762 spinlock_t *lgr_lock;
026c381f 763 u8 link_idx;
0cfdd8f9 764 int rc = 0;
cd6851f3 765 int i;
0cfdd8f9 766
bc36d2fc 767 if (ini->is_smcd && ini->vlan_id) {
5c21c4cc
UB		 768 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
769 ini->vlan_id)) {
7a62725a 770 rc = SMC_CLC_DECL_ISMVLANERR;
c6ba7c9b 771 goto out;
7a62725a 772 }
c6ba7c9b
HW		 773 }
774
0cfdd8f9
UB		 775 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
776 if (!lgr) {
7a62725a 777 rc = SMC_CLC_DECL_MEM;
29ee2701 778 goto ism_put_vlan;
0cfdd8f9 779 }
22ef473d
KG		 780 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
781 SMC_LGR_ID_SIZE, &lgr->id);
782 if (!lgr->tx_wq) {
783 rc = -ENOMEM;
784 goto free_lgr;
785 }
bc36d2fc 786 lgr->is_smcd = ini->is_smcd;
517c300e 787 lgr->sync_err = 0;
8e316b9e 788 lgr->terminating = 0;
8e316b9e 789 lgr->freeing = 0;
bc36d2fc 790 lgr->vlan_id = ini->vlan_id;
faca5360
KG		 791 mutex_init(&lgr->sndbufs_lock);
792 mutex_init(&lgr->rmbs_lock);
c6ba7c9b 793 rwlock_init(&lgr->conns_lock);
cd6851f3
UB		 794 for (i = 0; i < SMC_RMBE_SIZES; i++) {
795 INIT_LIST_HEAD(&lgr->sndbufs[i]);
796 INIT_LIST_HEAD(&lgr->rmbs[i]);
797 }
026c381f 798 lgr->next_link_id = 0;
9fda3510
HW		 799 smc_lgr_list.num += SMC_LGR_NUM_INCR;
800 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
0cfdd8f9 801 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
f528ba24 802 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
0cfdd8f9 803 lgr->conns_all = RB_ROOT;
bc36d2fc 804 if (ini->is_smcd) {
c6ba7c9b 805 /* SMC-D specific settings */
5c21c4cc
UB		 806 get_device(&ini->ism_dev[ini->ism_selected]->dev);
807 lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
808 lgr->smcd = ini->ism_dev[ini->ism_selected];
809 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
a0a62ee1 810 lgr_lock = &lgr->smcd->lgr_lock;
b81a5eb7 811 lgr->smc_version = ini->smcd_version;
50c6b20e 812 lgr->peer_shutdown = 0;
5c21c4cc 813 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
c6ba7c9b
HW		 814 } else {
815 /* SMC-R specific settings */
816 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
bc36d2fc
KG		 817 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
818 SMC_SYSTEMID_LEN);
35dcf7ec
KG		 819 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
820 SMC_MAX_PNETID_LEN);
00a049cf
KG		 821 smc_llc_lgr_init(lgr, smc);
822
026c381f
KG		 823 link_idx = SMC_SINGLE_LINK;
824 lnk = &lgr->lnk[link_idx];
825 rc = smcr_link_init(lgr, lnk, link_idx, ini);
c6ba7c9b 826 if (rc)
22ef473d 827 goto free_wq;
f3c1dedd
KG		 828 lgr_list = &smc_lgr_list.list;
829 lgr_lock = &smc_lgr_list.lock;
6dabd405 830 atomic_inc(&lgr_cnt);
c6ba7c9b 831 }
0cfdd8f9 832 smc->conn.lgr = lgr;
a0a62ee1 833 spin_lock_bh(lgr_lock);
a9e44502 834 list_add_tail(&lgr->list, lgr_list);
a0a62ee1 835 spin_unlock_bh(lgr_lock);
f38ba179
UB		 836 return 0;
837
22ef473d
KG		 838free_wq:
839 destroy_workqueue(lgr->tx_wq);
f38ba179
UB		 840free_lgr:
841 kfree(lgr);
29ee2701
UB		 842ism_put_vlan:
843 if (ini->is_smcd && ini->vlan_id)
5c21c4cc 844 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
0cfdd8f9 845out:
7a62725a
KG		 846 if (rc < 0) {
847 if (rc == -ENOMEM)
848 rc = SMC_CLC_DECL_MEM;
849 else
850 rc = SMC_CLC_DECL_INTERR;
851 }
0cfdd8f9
UB		 852 return rc;
853}
854
c6f02ebe
KG		 855static int smc_write_space(struct smc_connection *conn)
856{
857 int buffer_len = conn->peer_rmbe_size;
858 union smc_host_cursor prod;
859 union smc_host_cursor cons;
860 int space;
861
862 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
863 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
864 /* determine rx_buf space */
865 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
866 return space;
867}
868
b8ded9de
KG		 869static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
870 struct smc_wr_buf *wr_buf)
c6f02ebe
KG		 871{
872 struct smc_connection *conn = &smc->conn;
873 union smc_host_cursor cons, fin;
874 int rc = 0;
875 int diff;
876
877 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
878 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
879 /* set prod cursor to old state, enforce tx_rdma_writes() */
880 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
881 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
882
883 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
884 /* cons cursor advanced more than fin, and prod was set
885 * fin above, so now prod is smaller than cons. Fix that.
886 */
887 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
888 smc_curs_add(conn->sndbuf_desc->len,
889 &conn->tx_curs_sent, diff);
890 smc_curs_add(conn->sndbuf_desc->len,
891 &conn->tx_curs_fin, diff);
892
893 smp_mb__before_atomic();
894 atomic_add(diff, &conn->sndbuf_space);
895 smp_mb__after_atomic();
896
897 smc_curs_add(conn->peer_rmbe_size,
898 &conn->local_tx_ctrl.prod, diff);
899 smc_curs_add(conn->peer_rmbe_size,
900 &conn->local_tx_ctrl_fin, diff);
901 }
902 /* recalculate, value is used by tx_rdma_writes() */
903 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
904
905 if (smc->sk.sk_state != SMC_INIT &&
906 smc->sk.sk_state != SMC_CLOSED) {
b8ded9de 907 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
c6f02ebe 908 if (!rc) {
22ef473d 909 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
c6f02ebe
KG		 910 smc->sk.sk_data_ready(&smc->sk);
911 }
b8ded9de
KG		 912 } else {
913 smc_wr_tx_put_slot(conn->lnk,
914 (struct smc_wr_tx_pend_priv *)pend);
c6f02ebe
KG		 915 }
916 return rc;
917}
918
07d51580
GG		 919static void smc_switch_link_and_count(struct smc_connection *conn,
920 struct smc_link *to_lnk)
921{
922 atomic_dec(&conn->lnk->conn_cnt);
923 conn->lnk = to_lnk;
924 atomic_inc(&conn->lnk->conn_cnt);
925}
926
c6f02ebe
KG		 927struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
928 struct smc_link *from_lnk, bool is_dev_err)
929{
930 struct smc_link *to_lnk = NULL;
b8ded9de 931 struct smc_cdc_tx_pend *pend;
c6f02ebe 932 struct smc_connection *conn;
b8ded9de 933 struct smc_wr_buf *wr_buf;
c6f02ebe
KG		 934 struct smc_sock *smc;
935 struct rb_node *node;
936 int i, rc = 0;
937
938 /* link is inactive, wake up tx waiters */
939 smc_wr_wakeup_tx_wait(from_lnk);
940
941 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 942 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
c6f02ebe
KG		 943 continue;
944 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
945 from_lnk->ibport == lgr->lnk[i].ibport) {
946 continue;
947 }
948 to_lnk = &lgr->lnk[i];
949 break;
950 }
951 if (!to_lnk) {
952 smc_lgr_terminate_sched(lgr);
953 return NULL;
954 }
955again:
956 read_lock_bh(&lgr->conns_lock);
957 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
958 conn = rb_entry(node, struct smc_connection, alert_node);
959 if (conn->lnk != from_lnk)
960 continue;
961 smc = container_of(conn, struct smc_sock, conn);
962 /* conn->lnk not yet set in SMC_INIT state */
963 if (smc->sk.sk_state == SMC_INIT)
964 continue;
965 if (smc->sk.sk_state == SMC_CLOSED ||
966 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
967 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
968 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
969 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
970 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
971 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
972 smc->sk.sk_state == SMC_PEERABORTWAIT ||
973 smc->sk.sk_state == SMC_PROCESSABORT) {
974 spin_lock_bh(&conn->send_lock);
07d51580 975 smc_switch_link_and_count(conn, to_lnk);
c6f02ebe
KG		 976 spin_unlock_bh(&conn->send_lock);
977 continue;
978 }
979 sock_hold(&smc->sk);
980 read_unlock_bh(&lgr->conns_lock);
b8ded9de
KG		 981 /* pre-fetch buffer outside of send_lock, might sleep */
982 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
983 if (rc) {
984 smcr_link_down_cond_sched(to_lnk);
985 return NULL;
986 }
c6f02ebe
KG		 987 /* avoid race with smcr_tx_sndbuf_nonempty() */
988 spin_lock_bh(&conn->send_lock);
07d51580 989 smc_switch_link_and_count(conn, to_lnk);
b8ded9de 990 rc = smc_switch_cursor(smc, pend, wr_buf);
c6f02ebe
KG		 991 spin_unlock_bh(&conn->send_lock);
992 sock_put(&smc->sk);
993 if (rc) {
994 smcr_link_down_cond_sched(to_lnk);
995 return NULL;
996 }
997 goto again;
998 }
999 read_unlock_bh(&lgr->conns_lock);
1000 return to_lnk;
1001}
1002
b9247544 1003static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
6d74c3a8 1004 struct smc_link_group *lgr)
b9247544 1005{
d5500667
KG		 1006 int rc;
1007
b9247544
KG		 1008 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
1009 /* unregister rmb with peer */
d5500667
KG		 1010 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1011 if (!rc) {
1012 /* protect against smc_llc_cli_rkey_exchange() */
1013 mutex_lock(&lgr->llc_conf_mutex);
1014 smc_llc_do_delete_rkey(lgr, rmb_desc);
1015 rmb_desc->is_conf_rkey = false;
1016 mutex_unlock(&lgr->llc_conf_mutex);
1017 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1018 }
b9247544 1019 }
d5500667 1020
b9247544
KG		 1021 if (rmb_desc->is_reg_err) {
1022 /* buf registration failed, reuse not possible */
faca5360 1023 mutex_lock(&lgr->rmbs_lock);
b9247544 1024 list_del(&rmb_desc->list);
faca5360 1025 mutex_unlock(&lgr->rmbs_lock);
b9247544
KG		 1026
1027 smc_buf_free(lgr, true, rmb_desc);
1028 } else {
1029 rmb_desc->used = 0;
1030 }
1031}
1032
fb692ec4
KG		 1033static void smc_buf_unuse(struct smc_connection *conn,
1034 struct smc_link_group *lgr)
cd6851f3 1035{
69cb7dc0 1036 if (conn->sndbuf_desc)
cd6851f3 1037 conn->sndbuf_desc->used = 0;
b9247544
KG		 1038 if (conn->rmb_desc && lgr->is_smcd)
1039 conn->rmb_desc->used = 0;
1040 else if (conn->rmb_desc)
6d74c3a8 1041 smcr_buf_unuse(conn->rmb_desc, lgr);
cd6851f3
UB		 1042}
1043
0cfdd8f9
UB		 1044/* remove a finished connection from its link group */
1045void smc_conn_free(struct smc_connection *conn)
1046{
fb692ec4
KG		 1047 struct smc_link_group *lgr = conn->lgr;
1048
1049 if (!lgr)
0cfdd8f9 1050 return;
fb692ec4 1051 if (lgr->is_smcd) {
42bfba9e
UB		 1052 if (!list_empty(&lgr->list))
1053 smc_ism_unset_conn(conn);
be244f28
HW		 1054 tasklet_kill(&conn->rx_tsklet);
1055 } else {
c6ba7c9b 1056 smc_cdc_tx_dismiss_slots(conn);
b286a065
KG		 1057 if (current_work() != &conn->abort_work)
1058 cancel_work_sync(&conn->abort_work);
be244f28 1059 }
2a0674ff
UB		 1060 if (!list_empty(&lgr->list)) {
1061 smc_lgr_unregister_conn(conn);
1062 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
1063 }
fb692ec4
KG		 1064
1065 if (!lgr->conns_num)
1066 smc_lgr_schedule_free_work(lgr);
0cfdd8f9
UB		 1067}
1068
4a3641c1
KG		 1069/* unregister a link from a buf_desc */
1070static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1071 struct smc_link *lnk)
1072{
1073 if (is_rmb)
1074 buf_desc->is_reg_mr[lnk->link_idx] = false;
1075 if (!buf_desc->is_map_ib[lnk->link_idx])
1076 return;
1077 if (is_rmb) {
1078 if (buf_desc->mr_rx[lnk->link_idx]) {
1079 smc_ib_put_memory_region(
1080 buf_desc->mr_rx[lnk->link_idx]);
1081 buf_desc->mr_rx[lnk->link_idx] = NULL;
1082 }
1083 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
1084 } else {
1085 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
1086 }
1087 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1088 buf_desc->is_map_ib[lnk->link_idx] = false;
1089}
1090
1091/* unmap all buffers of lgr for a deleted link */
1092static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1093{
1094 struct smc_link_group *lgr = lnk->lgr;
1095 struct smc_buf_desc *buf_desc, *bf;
1096 int i;
1097
1098 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1099 mutex_lock(&lgr->rmbs_lock);
1100 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1101 smcr_buf_unmap_link(buf_desc, true, lnk);
1102 mutex_unlock(&lgr->rmbs_lock);
1103 mutex_lock(&lgr->sndbufs_lock);
1104 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1105 list)
1106 smcr_buf_unmap_link(buf_desc, false, lnk);
1107 mutex_unlock(&lgr->sndbufs_lock);
1108 }
1109}
1110
1111static void smcr_rtoken_clear_link(struct smc_link *lnk)
1112{
1113 struct smc_link_group *lgr = lnk->lgr;
1114 int i;
1115
1116 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1117 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1118 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1119 }
1120}
1121
d5500667 1122/* must be called under lgr->llc_conf_mutex lock */
0a99be43 1123void smcr_link_clear(struct smc_link *lnk, bool log)
0cfdd8f9 1124{
d854fcbf
KG		 1125 struct smc_ib_device *smcibdev;
1126
4a3641c1 1127 if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
b9247544 1128 return;
0cfdd8f9 1129 lnk->peer_qpn = 0;
0a99be43 1130 smc_llc_link_clear(lnk, log);
4a3641c1
KG		 1131 smcr_buf_unmap_lgr(lnk);
1132 smcr_rtoken_clear_link(lnk);
bd4ad577 1133 smc_ib_modify_qp_reset(lnk);
f38ba179 1134 smc_wr_free_link(lnk);
bd4ad577
UB		 1135 smc_ib_destroy_queue_pair(lnk);
1136 smc_ib_dealloc_protection_domain(lnk);
f38ba179 1137 smc_wr_free_link_mem(lnk);
ddc99286 1138 smc_ibdev_cnt_dec(lnk);
f3c1dedd 1139 put_device(&lnk->smcibdev->ibdev->dev);
d854fcbf
KG		 1140 smcibdev = lnk->smcibdev;
1141 memset(lnk, 0, sizeof(struct smc_link));
1142 lnk->state = SMC_LNK_UNUSED;
1143 if (!atomic_dec_return(&smcibdev->lnk_cnt))
1144 wake_up(&smcibdev->lnks_deleted);
0cfdd8f9
UB		 1145}
1146
c6ba7c9b
HW		 1147static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1148 struct smc_buf_desc *buf_desc)
cd6851f3 1149{
b9247544 1150 int i;
6511aad3 1151
4a3641c1
KG		 1152 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1153 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
387707fd 1154
2ef4f27a
SR		 1155 if (buf_desc->pages)
1156 __free_pages(buf_desc->pages, buf_desc->order);
3e034725 1157 kfree(buf_desc);
cd6851f3
UB		 1158}
1159
c6ba7c9b
HW		 1160static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1161 struct smc_buf_desc *buf_desc)
1162{
be244f28
HW		 1163 if (is_dmb) {
1164 /* restore original buf len */
1165 buf_desc->len += sizeof(struct smcd_cdc_msg);
c6ba7c9b 1166 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
be244f28 1167 } else {
c6ba7c9b 1168 kfree(buf_desc->cpu_addr);
be244f28 1169 }
c6ba7c9b
HW		 1170 kfree(buf_desc);
1171}
1172
1173static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1174 struct smc_buf_desc *buf_desc)
1175{
1176 if (lgr->is_smcd)
1177 smcd_buf_free(lgr, is_rmb, buf_desc);
1178 else
1179 smcr_buf_free(lgr, is_rmb, buf_desc);
1180}
1181
3e034725 1182static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
cd6851f3 1183{
3e034725
UB		 1184 struct smc_buf_desc *buf_desc, *bf_desc;
1185 struct list_head *buf_list;
cd6851f3
UB		 1186 int i;
1187
1188 for (i = 0; i < SMC_RMBE_SIZES; i++) {
3e034725
UB		 1189 if (is_rmb)
1190 buf_list = &lgr->rmbs[i];
1191 else
1192 buf_list = &lgr->sndbufs[i];
1193 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
cd6851f3 1194 list) {
3e034725 1195 list_del(&buf_desc->list);
6511aad3 1196 smc_buf_free(lgr, is_rmb, buf_desc);
cd6851f3
UB		 1197 }
1198 }
1199}
1200
3e034725
UB		 1201static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1202{
1203 /* free send buffers */
1204 __smc_lgr_free_bufs(lgr, false);
1205 /* free rmbs */
1206 __smc_lgr_free_bufs(lgr, true);
1207}
1208
0cfdd8f9 1209/* remove a link group */
3f3f0e36 1210static void smc_lgr_free(struct smc_link_group *lgr)
0cfdd8f9 1211{
b9247544
KG		 1212 int i;
1213
a52bcc91
KG		 1214 if (!lgr->is_smcd) {
1215 mutex_lock(&lgr->llc_conf_mutex);
1216 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1217 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
0a99be43 1218 smcr_link_clear(&lgr->lnk[i], false);
a52bcc91
KG		 1219 }
1220 mutex_unlock(&lgr->llc_conf_mutex);
1221 smc_llc_lgr_clear(lgr);
1222 }
1223
3e034725 1224 smc_lgr_free_bufs(lgr);
22ef473d 1225 destroy_workqueue(lgr->tx_wq);
b3cb53c0 1226 if (lgr->is_smcd) {
f9aab6f2
UB		 1227 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
1228 put_device(&lgr->smcd->dev);
5edd6b9c
UB		 1229 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1230 wake_up(&lgr->smcd->lgrs_deleted);
b3cb53c0 1231 } else {
6dabd405
UB		 1232 if (!atomic_dec_return(&lgr_cnt))
1233 wake_up(&lgrs_deleted);
b3cb53c0 1234 }
0cfdd8f9
UB		 1235 kfree(lgr);
1236}
1237
42bfba9e
UB		 1238static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
1239{
1240 int i;
1241
1242 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1243 struct smc_buf_desc *buf_desc;
1244
1245 list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
1246 buf_desc->len += sizeof(struct smcd_cdc_msg);
1247 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
1248 }
1249 }
1250}
1251
2a0674ff
UB		 1252static void smc_sk_wake_ups(struct smc_sock *smc)
1253{
1254 smc->sk.sk_write_space(&smc->sk);
1255 smc->sk.sk_data_ready(&smc->sk);
1256 smc->sk.sk_state_change(&smc->sk);
1257}
1258
1259/* kill a connection */
5421ec28 1260static void smc_conn_kill(struct smc_connection *conn, bool soft)
2a0674ff
UB		 1261{
1262 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1263
50c6b20e
UB		 1264 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1265 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1266 else
1267 smc_close_abort(conn);
2a0674ff 1268 conn->killed = 1;
50c6b20e 1269 smc->sk.sk_err = ECONNABORTED;
2a0674ff 1270 smc_sk_wake_ups(smc);
42bfba9e
UB		 1271 if (conn->lgr->is_smcd) {
1272 smc_ism_unset_conn(conn);
5421ec28
UB		 1273 if (soft)
1274 tasklet_kill(&conn->rx_tsklet);
1275 else
1276 tasklet_unlock_wait(&conn->rx_tsklet);
6a37ad3d
UB		 1277 } else {
1278 smc_cdc_tx_dismiss_slots(conn);
42bfba9e 1279 }
2a0674ff 1280 smc_lgr_unregister_conn(conn);
81cf4f47 1281 smc_close_active_abort(smc);
2a0674ff
UB		 1282}
1283
42bfba9e
UB		 1284static void smc_lgr_cleanup(struct smc_link_group *lgr)
1285{
1286 if (lgr->is_smcd) {
1287 smc_ism_signal_shutdown(lgr);
1288 smcd_unregister_all_dmbs(lgr);
42bfba9e 1289 } else {
3e0c40af
KG		 1290 u32 rsn = lgr->llc_termination_rsn;
1291
1292 if (!rsn)
1293 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1294 smc_llc_send_link_delete_all(lgr, false, rsn);
a52bcc91 1295 smcr_lgr_link_deactivate_all(lgr);
42bfba9e
UB		 1296 }
1297}
1298
ba952060
KG		 1299/* terminate link group
1300 * @soft: true if link group shutdown can take its time
1301 * false if immediate link group shutdown is required
1302 */
5421ec28 1303static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
0cfdd8f9
UB		 1304{
1305 struct smc_connection *conn;
b38d7324 1306 struct smc_sock *smc;
0cfdd8f9
UB		 1307 struct rb_node *node;
1308
517c300e
KG		 1309 if (lgr->terminating)
1310 return; /* lgr already terminating */
a52bcc91
KG		 1311 /* cancel free_work sync, will terminate when lgr->freeing is set */
1312 cancel_delayed_work_sync(&lgr->free_work);
517c300e 1313 lgr->terminating = 1;
0cfdd8f9 1314
69318b52
UB		 1315 /* kill remaining link group connections */
1316 read_lock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 1317 node = rb_first(&lgr->conns_all);
1318 while (node) {
69318b52 1319 read_unlock_bh(&lgr->conns_lock);
0cfdd8f9 1320 conn = rb_entry(node, struct smc_connection, alert_node);
b38d7324 1321 smc = container_of(conn, struct smc_sock, conn);
81cf4f47 1322 sock_hold(&smc->sk); /* sock_put below */
69318b52 1323 lock_sock(&smc->sk);
5421ec28 1324 smc_conn_kill(conn, soft);
69318b52 1325 release_sock(&smc->sk);
81cf4f47 1326 sock_put(&smc->sk); /* sock_hold above */
69318b52 1327 read_lock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 1328 node = rb_first(&lgr->conns_all);
1329 }
69318b52 1330 read_unlock_bh(&lgr->conns_lock);
42bfba9e 1331 smc_lgr_cleanup(lgr);
a52bcc91 1332 smc_lgr_free(lgr);
0cfdd8f9
UB		 1333}
1334
5f78fe96
KG		 1335/* unlink link group and schedule termination */
1336void smc_lgr_terminate_sched(struct smc_link_group *lgr)
b9f227c3 1337{
a0a62ee1
UB		 1338 spinlock_t *lgr_lock;
1339
1340 smc_lgr_list_head(lgr, &lgr_lock);
1341 spin_lock_bh(lgr_lock);
3739707c 1342 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
8caa6544
UB		 1343 spin_unlock_bh(lgr_lock);
1344 return; /* lgr already terminating */
1345 }
1346 list_del_init(&lgr->list);
a52bcc91 1347 lgr->freeing = 1;
a0a62ee1 1348 spin_unlock_bh(lgr_lock);
5f78fe96 1349 schedule_work(&lgr->terminate_work);
b9f227c3
HW		 1350}
1351
5421ec28 1352/* Called when peer lgr shutdown (regularly or abnormally) is received */
0512f69e 1353void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
c6ba7c9b
HW		 1354{
1355 struct smc_link_group *lgr, *l;
1356 LIST_HEAD(lgr_free_list);
1357
1358 /* run common cleanup function and build free list */
a0a62ee1 1359 spin_lock_bh(&dev->lgr_lock);
a2351c5d
UB		 1360 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
1361 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
0512f69e 1362 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
50c6b20e
UB		 1363 if (peer_gid) /* peer triggered termination */
1364 lgr->peer_shutdown = 1;
c6ba7c9b 1365 list_move(&lgr->list, &lgr_free_list);
a52bcc91 1366 lgr->freeing = 1;
c6ba7c9b
HW		 1367 }
1368 }
a0a62ee1 1369 spin_unlock_bh(&dev->lgr_lock);
c6ba7c9b
HW		 1370
1371 /* cancel the regular free workers and actually free lgrs */
1372 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1373 list_del_init(&lgr->list);
50c6b20e 1374 schedule_work(&lgr->terminate_work);
c6ba7c9b
HW		 1375 }
1376}
1377
5421ec28
UB		 1378/* Called when an SMCD device is removed or the smc module is unloaded */
1379void smc_smcd_terminate_all(struct smcd_dev *smcd)
1380{
1381 struct smc_link_group *lgr, *lg;
1382 LIST_HEAD(lgr_free_list);
1383
1384 spin_lock_bh(&smcd->lgr_lock);
1385 list_splice_init(&smcd->lgr_list, &lgr_free_list);
1386 list_for_each_entry(lgr, &lgr_free_list, list)
1387 lgr->freeing = 1;
1388 spin_unlock_bh(&smcd->lgr_lock);
1389
1390 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1391 list_del_init(&lgr->list);
1392 __smc_lgr_terminate(lgr, false);
1393 }
5edd6b9c
UB		 1394
1395 if (atomic_read(&smcd->lgr_cnt))
1396 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
5421ec28
UB		 1397}
1398
0b29ec64
UB		 1399/* Called when an SMCR device is removed or the smc module is unloaded.
1400 * If smcibdev is given, all SMCR link groups using this device are terminated.
1401 * If smcibdev is NULL, all SMCR link groups are terminated.
1402 */
1403void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1404{
1405 struct smc_link_group *lgr, *lg;
1406 LIST_HEAD(lgr_free_list);
b9247544 1407 int i;
0b29ec64
UB		 1408
1409 spin_lock_bh(&smc_lgr_list.lock);
1410 if (!smcibdev) {
1411 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1412 list_for_each_entry(lgr, &lgr_free_list, list)
1413 lgr->freeing = 1;
1414 } else {
1415 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
b9247544 1416 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
87523930
KG		 1417 if (lgr->lnk[i].smcibdev == smcibdev)
1418 smcr_link_down_cond_sched(&lgr->lnk[i]);
0b29ec64
UB		 1419 }
1420 }
1421 }
1422 spin_unlock_bh(&smc_lgr_list.lock);
1423
1424 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1425 list_del_init(&lgr->list);
3e0c40af 1426 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
0b29ec64
UB		 1427 __smc_lgr_terminate(lgr, false);
1428 }
6dabd405
UB		 1429
1430 if (smcibdev) {
1431 if (atomic_read(&smcibdev->lnk_cnt))
1432 wait_event(smcibdev->lnks_deleted,
1433 !atomic_read(&smcibdev->lnk_cnt));
1434 } else {
1435 if (atomic_read(&lgr_cnt))
1436 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1437 }
0b29ec64
UB		 1438}
1439
ad6c111b
KG		 1440/* set new lgr type and clear all asymmetric link tagging */
1441void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1442{
0a99be43 1443 char *lgr_type = "";
ad6c111b
KG		 1444 int i;
1445
1446 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1447 if (smc_link_usable(&lgr->lnk[i]))
1448 lgr->lnk[i].link_is_asym = false;
0a99be43
KG		 1449 if (lgr->type == new_type)
1450 return;
ad6c111b 1451 lgr->type = new_type;
0a99be43
KG		 1452
1453 switch (lgr->type) {
1454 case SMC_LGR_NONE:
1455 lgr_type = "NONE";
1456 break;
1457 case SMC_LGR_SINGLE:
1458 lgr_type = "SINGLE";
1459 break;
1460 case SMC_LGR_SYMMETRIC:
1461 lgr_type = "SYMMETRIC";
1462 break;
1463 case SMC_LGR_ASYMMETRIC_PEER:
1464 lgr_type = "ASYMMETRIC_PEER";
1465 break;
1466 case SMC_LGR_ASYMMETRIC_LOCAL:
1467 lgr_type = "ASYMMETRIC_LOCAL";
1468 break;
1469 }
1470 pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1471 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1472 lgr_type, lgr->pnet_id);
ad6c111b
KG		 1473}
1474
1475/* set new lgr type and tag a link as asymmetric */
1476void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1477 enum smc_lgr_type new_type, int asym_lnk_idx)
1478{
1479 smcr_lgr_set_type(lgr, new_type);
1480 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1481}
1482
b286a065
KG		 1483/* abort connection, abort_work scheduled from tasklet context */
1484static void smc_conn_abort_work(struct work_struct *work)
1485{
1486 struct smc_connection *conn = container_of(work,
1487 struct smc_connection,
1488 abort_work);
1489 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1490
1491 smc_conn_kill(conn, true);
1492 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1493}
1494
1f90a05d
KG		 1495void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1496{
1f90a05d
KG		 1497 struct smc_link_group *lgr, *n;
1498
1499 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
c48254fa
KG		 1500 struct smc_link *link;
1501
1f90a05d
KG		 1502 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1503 SMC_MAX_PNETID_LEN) ||
1504 lgr->type == SMC_LGR_SYMMETRIC ||
1505 lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1506 continue;
c48254fa
KG		 1507
1508 /* trigger local add link processing */
1509 link = smc_llc_usable_link(lgr);
1510 if (link)
1511 smc_llc_add_link_local(link);
1f90a05d
KG		 1512 }
1513}
1514
541afa10
KG		 1515/* link is down - switch connections to alternate link,
1516 * must be called under lgr->llc_conf_mutex lock
1517 */
1518static void smcr_link_down(struct smc_link *lnk)
1519{
1520 struct smc_link_group *lgr = lnk->lgr;
1521 struct smc_link *to_lnk;
1522 int del_link_id;
1523
1524 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1525 return;
1526
1527 smc_ib_modify_qp_reset(lnk);
c6f02ebe 1528 to_lnk = smc_switch_conns(lgr, lnk, true);
541afa10 1529 if (!to_lnk) { /* no backup link available */
0a99be43 1530 smcr_link_clear(lnk, true);
541afa10
KG		 1531 return;
1532 }
ad6c111b 1533 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
541afa10
KG		 1534 del_link_id = lnk->link_id;
1535
1536 if (lgr->role == SMC_SERV) {
1537 /* trigger local delete link processing */
4dadd151 1538 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
541afa10
KG		 1539 } else {
1540 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1541 /* another llc task is ongoing */
1542 mutex_unlock(&lgr->llc_conf_mutex);
6778a6be
KG		 1543 wait_event_timeout(lgr->llc_flow_waiter,
1544 (list_empty(&lgr->list) ||
1545 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
541afa10
KG		 1546 SMC_LLC_WAIT_TIME);
1547 mutex_lock(&lgr->llc_conf_mutex);
1548 }
68fd8942 1549 if (!list_empty(&lgr->list)) {
6778a6be
KG		 1550 smc_llc_send_delete_link(to_lnk, del_link_id,
1551 SMC_LLC_REQ, true,
1552 SMC_LLC_DEL_LOST_PATH);
68fd8942
KG		 1553 smcr_link_clear(lnk, true);
1554 }
6778a6be 1555 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
541afa10
KG		 1556 }
1557}
1558
1559/* must be called under lgr->llc_conf_mutex lock */
1560void smcr_link_down_cond(struct smc_link *lnk)
1561{
1562 if (smc_link_downing(&lnk->state))
1563 smcr_link_down(lnk);
1564}
1565
1566/* will get the lgr->llc_conf_mutex lock */
1567void smcr_link_down_cond_sched(struct smc_link *lnk)
1568{
1569 if (smc_link_downing(&lnk->state))
1570 schedule_work(&lnk->link_down_wrk);
1571}
1572
1573void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1574{
1575 struct smc_link_group *lgr, *n;
1576 int i;
1577
1578 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1579 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1580 SMC_MAX_PNETID_LEN))
1581 continue; /* lgr is not affected */
1582 if (list_empty(&lgr->list))
1583 continue;
1584 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1585 struct smc_link *lnk = &lgr->lnk[i];
1586
1587 if (smc_link_usable(lnk) &&
1588 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1589 smcr_link_down_cond_sched(lnk);
1590 }
1591 }
1592}
1593
541afa10
KG		 1594static void smc_link_down_work(struct work_struct *work)
1595{
1596 struct smc_link *link = container_of(work, struct smc_link,
1597 link_down_wrk);
1598 struct smc_link_group *lgr = link->lgr;
1599
1600 if (list_empty(&lgr->list))
1601 return;
6778a6be 1602 wake_up_all(&lgr->llc_msg_waiter);
541afa10
KG		 1603 mutex_lock(&lgr->llc_conf_mutex);
1604 smcr_link_down(link);
1605 mutex_unlock(&lgr->llc_conf_mutex);
1606}
1607
0cfdd8f9
UB		 1608/* Determine vlan of internal TCP socket.
1609 * @vlan_id: address to store the determined vlan id into
1610 */
bc36d2fc 1611int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
0cfdd8f9
UB		 1612{
1613 struct dst_entry *dst = sk_dst_get(clcsock->sk);
cb9d43f6
UB		 1614 struct net_device *ndev;
1615 int i, nest_lvl, rc = 0;
0cfdd8f9 1616
bc36d2fc 1617 ini->vlan_id = 0;
0cfdd8f9
UB		 1618 if (!dst) {
1619 rc = -ENOTCONN;
1620 goto out;
1621 }
1622 if (!dst->dev) {
1623 rc = -ENODEV;
1624 goto out_rel;
1625 }
1626
cb9d43f6
UB		 1627 ndev = dst->dev;
1628 if (is_vlan_dev(ndev)) {
bc36d2fc 1629 ini->vlan_id = vlan_dev_vlan_id(ndev);
cb9d43f6
UB		 1630 goto out_rel;
1631 }
1632
1633 rtnl_lock();
f3b0a18b 1634 nest_lvl = ndev->lower_level;
cb9d43f6
UB		 1635 for (i = 0; i < nest_lvl; i++) {
1636 struct list_head *lower = &ndev->adj_list.lower;
1637
1638 if (list_empty(lower))
1639 break;
1640 lower = lower->next;
1641 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
1642 if (is_vlan_dev(ndev)) {
bc36d2fc 1643 ini->vlan_id = vlan_dev_vlan_id(ndev);
cb9d43f6
UB		 1644 break;
1645 }
1646 }
1647 rtnl_unlock();
0cfdd8f9
UB		 1648
1649out_rel:
1650 dst_release(dst);
1651out:
1652 return rc;
1653}
1654
c6ba7c9b
HW		 1655static bool smcr_lgr_match(struct smc_link_group *lgr,
1656 struct smc_clc_msg_local *lcl,
ee05ff7a 1657 enum smc_lgr_role role, u32 clcqpn)
0cfdd8f9 1658{
b9247544
KG		 1659 int i;
1660
1661 if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1662 lgr->role != role)
1663 return false;
1664
1665 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 1666 if (!smc_link_active(&lgr->lnk[i]))
b9247544
KG		 1667 continue;
1668 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1669 !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1670 !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1671 return true;
1672 }
1673 return false;
c6ba7c9b 1674}
0cfdd8f9 1675
c6ba7c9b
HW		 1676static bool smcd_lgr_match(struct smc_link_group *lgr,
1677 struct smcd_dev *smcismdev, u64 peer_gid)
1678{
1679 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
0cfdd8f9
UB		 1680}
1681
1682/* create a new SMC connection (and a new link group if necessary) */
bc36d2fc 1683int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
0cfdd8f9
UB		 1684{
1685 struct smc_connection *conn = &smc->conn;
a2351c5d 1686 struct list_head *lgr_list;
0cfdd8f9 1687 struct smc_link_group *lgr;
0cfdd8f9 1688 enum smc_lgr_role role;
a0a62ee1 1689 spinlock_t *lgr_lock;
0cfdd8f9
UB		 1690 int rc = 0;
1691
5c21c4cc 1692 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
3fc64937 1693 &smc_lgr_list.list;
5c21c4cc 1694 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
3fc64937 1695 &smc_lgr_list.lock;
5ac54d87 1696 ini->first_contact_local = 1;
0cfdd8f9 1697 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
5ac54d87 1698 if (role == SMC_CLNT && ini->first_contact_peer)
0cfdd8f9
UB		 1699 /* create new link group as well */
1700 goto create;
1701
1702 /* determine if an existing link group can be reused */
a0a62ee1 1703 spin_lock_bh(lgr_lock);
a2351c5d 1704 list_for_each_entry(lgr, lgr_list, list) {
0cfdd8f9 1705 write_lock_bh(&lgr->conns_lock);
bc36d2fc 1706 if ((ini->is_smcd ?
5c21c4cc
UB		 1707 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
1708 ini->ism_peer_gid[ini->ism_selected]) :
bc36d2fc 1709 smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
0cfdd8f9 1710 !lgr->sync_err &&
0530bd6e
KG		 1711 (ini->smcd_version == SMC_V2 ||
1712 lgr->vlan_id == ini->vlan_id) &&
a9e44502 1713 (role == SMC_CLNT || ini->is_smcd ||
c6ba7c9b 1714 lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
0cfdd8f9 1715 /* link group found */
5ac54d87 1716 ini->first_contact_local = 0;
0cfdd8f9 1717 conn->lgr = lgr;
56bc3b20 1718 rc = smc_lgr_register_conn(conn, false);
0cfdd8f9 1719 write_unlock_bh(&lgr->conns_lock);
b9247544
KG		 1720 if (!rc && delayed_work_pending(&lgr->free_work))
1721 cancel_delayed_work(&lgr->free_work);
0cfdd8f9
UB		 1722 break;
1723 }
1724 write_unlock_bh(&lgr->conns_lock);
1725 }
a0a62ee1 1726 spin_unlock_bh(lgr_lock);
b9247544
KG		 1727 if (rc)
1728 return rc;
0cfdd8f9 1729
5ac54d87
UB		 1730 if (role == SMC_CLNT && !ini->first_contact_peer &&
1731 ini->first_contact_local) {
0cfdd8f9
UB		 1732 /* Server reuses a link group, but Client wants to start
1733 * a new one
1734 * send out_of_sync decline, reason synchr. error
1735 */
7a62725a 1736 return SMC_CLC_DECL_SYNCERR;
0cfdd8f9
UB		 1737 }
1738
1739create:
5ac54d87 1740 if (ini->first_contact_local) {
bc36d2fc 1741 rc = smc_lgr_create(smc, ini);
0cfdd8f9
UB		 1742 if (rc)
1743 goto out;
44808792
HZ		 1744 lgr = conn->lgr;
1745 write_lock_bh(&lgr->conns_lock);
56bc3b20 1746 rc = smc_lgr_register_conn(conn, true);
44808792 1747 write_unlock_bh(&lgr->conns_lock);
b9247544
KG		 1748 if (rc)
1749 goto out;
0cfdd8f9 1750 }
5f08318f 1751 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
cbba07a7 1752 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
de8474eb 1753 conn->urg_state = SMC_URG_READ;
b286a065 1754 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
bc36d2fc 1755 if (ini->is_smcd) {
be244f28
HW		 1756 conn->rx_off = sizeof(struct smcd_cdc_msg);
1757 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
2d2bfeb8
UB		 1758 } else {
1759 conn->rx_off = 0;
be244f28 1760 }
5f08318f
UB		 1761#ifndef KERNEL_HAS_ATOMIC64
1762 spin_lock_init(&conn->acurs_lock);
1763#endif
0cfdd8f9
UB		 1764
1765out:
7a62725a 1766 return rc;
0cfdd8f9 1767}
cd6851f3 1768
2f6becaf
HW		 1769/* convert the RMB size into the compressed notation - minimum 16K.
1770 * In contrast to plain ilog2, this rounds towards the next power of 2,
1771 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1772 */
1773static u8 smc_compress_bufsize(int size)
1774{
1775 u8 compressed;
1776
1777 if (size <= SMC_BUF_MIN_SIZE)
1778 return 0;
1779
1780 size = (size - 1) >> 14;
1781 compressed = ilog2(size) + 1;
1782 if (compressed >= SMC_RMBE_SIZES)
1783 compressed = SMC_RMBE_SIZES - 1;
1784 return compressed;
1785}
1786
1787/* convert the RMB size from compressed notation into integer */
1788int smc_uncompress_bufsize(u8 compressed)
1789{
1790 u32 size;
1791
1792 size = 0x00000001 << (((int)compressed) + 14);
1793 return (int)size;
1794}
1795
3e034725
UB		 1796/* try to reuse a sndbuf or rmb description slot for a certain
1797 * buffer size; if not available, return NULL
cd6851f3 1798 */
8437bda0 1799static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
faca5360 1800 struct mutex *lock,
8437bda0 1801 struct list_head *buf_list)
cd6851f3 1802{
3e034725 1803 struct smc_buf_desc *buf_slot;
cd6851f3 1804
faca5360 1805 mutex_lock(lock);
3e034725
UB		 1806 list_for_each_entry(buf_slot, buf_list, list) {
1807 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
faca5360 1808 mutex_unlock(lock);
3e034725 1809 return buf_slot;
cd6851f3
UB		 1810 }
1811 }
faca5360 1812 mutex_unlock(lock);
cd6851f3
UB		 1813 return NULL;
1814}
1815
952310cc
UB		 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 */
1820static 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
b9247544
KG		 1825/* map an rmb buf to a link */
1826static 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
1862buf_unmap:
1863 smc_ib_buf_unmap_sg(lnk, buf_desc,
1864 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1865free_table:
1866 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1867 return rc;
1868}
1869
d5500667
KG		 1870/* register a new rmb on IB device,
1871 * must be called under lgr->llc_conf_mutex lock
1872 */
7562a13d
KG		 1873int 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
fb33d277
KG		 1888static 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 }
1902out:
1903 mutex_unlock(lock);
1904 return rc;
1905}
1906
1907/* map all used buffers of lgr for a new link */
1908int 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
d5500667
KG		 1926/* register all used buffers of lgr for a new link,
1927 * must be called under lgr->llc_conf_mutex lock
1928 */
fb33d277
KG		 1929int 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 }
1945out:
1946 mutex_unlock(&lgr->rmbs_lock);
1947 return rc;
1948}
1949
c6ba7c9b
HW		 1950static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1951 bool is_rmb, int bufsize)
b33982c3
UB		 1952{
1953 struct smc_buf_desc *buf_desc;
b33982c3
UB		 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
2ef4f27a
SR		 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) {
b33982c3
UB		 1966 kfree(buf_desc);
1967 return ERR_PTR(-EAGAIN);
1968 }
2ef4f27a 1969 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
b9247544
KG		 1970 buf_desc->len = bufsize;
1971 return buf_desc;
1972}
b33982c3 1973
b9247544
KG		 1974/* map buf_desc on all usable links,
1975 * unused buffers stay mapped as long as the link is up
1976 */
1977static 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;
b33982c3 1981
d5500667
KG		 1982 /* protect against parallel link reconfiguration */
1983 mutex_lock(&lgr->llc_conf_mutex);
b9247544
KG		 1984 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1985 struct smc_link *lnk = &lgr->lnk[i];
b33982c3 1986
d854fcbf 1987 if (!smc_link_usable(lnk))
b9247544
KG		 1988 continue;
1989 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
b9247544
KG		 1990 rc = -ENOMEM;
1991 goto out;
b33982c3
UB		 1992 }
1993 }
b9247544 1994out:
d5500667 1995 mutex_unlock(&lgr->llc_conf_mutex);
b9247544 1996 return rc;
b33982c3
UB		 1997}
1998
ef12ad45 1999#define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
c6ba7c9b
HW		 2000
2001static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
2002 bool is_dmb, int bufsize)
2003{
2004 struct smc_buf_desc *buf_desc;
2005 int rc;
2006
2007 if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
2008 return ERR_PTR(-EAGAIN);
2009
2010 /* try to alloc a new DMB */
2011 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2012 if (!buf_desc)
2013 return ERR_PTR(-ENOMEM);
2014 if (is_dmb) {
2015 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2016 if (rc) {
2017 kfree(buf_desc);
96d6fded
KG		 2018 if (rc == -ENOMEM)
2019 return ERR_PTR(-EAGAIN);
2020 if (rc == -ENOSPC)
2021 return ERR_PTR(-ENOSPC);
2022 return ERR_PTR(-EIO);
c6ba7c9b 2023 }
be244f28
HW		 2024 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2025 /* CDC header stored in buf. So, pretend it was smaller */
2026 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
c6ba7c9b
HW		 2027 } else {
2028 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2029 __GFP_NOWARN | __GFP_NORETRY |
2030 __GFP_NOMEMALLOC);
2031 if (!buf_desc->cpu_addr) {
2032 kfree(buf_desc);
2033 return ERR_PTR(-EAGAIN);
2034 }
2035 buf_desc->len = bufsize;
2036 }
2037 return buf_desc;
2038}
2039
2040static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
cd6851f3 2041{
8437bda0 2042 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
cd6851f3
UB		 2043 struct smc_connection *conn = &smc->conn;
2044 struct smc_link_group *lgr = conn->lgr;
3e034725 2045 struct list_head *buf_list;
c45abf31 2046 int bufsize, bufsize_short;
faca5360 2047 struct mutex *lock; /* lock buffer list */
3e034725 2048 int sk_buf_size;
cd6851f3 2049
3e034725
UB		 2050 if (is_rmb)
2051 /* use socket recv buffer size (w/o overhead) as start value */
2052 sk_buf_size = smc->sk.sk_rcvbuf / 2;
2053 else
2054 /* use socket send buffer size (w/o overhead) as start value */
2055 sk_buf_size = smc->sk.sk_sndbuf / 2;
2056
4e1061f4 2057 for (bufsize_short = smc_compress_bufsize(sk_buf_size);
c45abf31 2058 bufsize_short >= 0; bufsize_short--) {
9d8fb617 2059
3e034725
UB		 2060 if (is_rmb) {
2061 lock = &lgr->rmbs_lock;
2062 buf_list = &lgr->rmbs[bufsize_short];
2063 } else {
2064 lock = &lgr->sndbufs_lock;
2065 buf_list = &lgr->sndbufs[bufsize_short];
9d8fb617 2066 }
c45abf31 2067 bufsize = smc_uncompress_bufsize(bufsize_short);
a3fe3d01
UB		 2068 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
2069 continue;
2070
3e034725 2071 /* check for reusable slot in the link group */
8437bda0 2072 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
3e034725
UB		 2073 if (buf_desc) {
2074 memset(buf_desc->cpu_addr, 0, bufsize);
cd6851f3
UB		 2075 break; /* found reusable slot */
2076 }
a3fe3d01 2077
c6ba7c9b
HW		 2078 if (is_smcd)
2079 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2080 else
2081 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
2082
b33982c3
UB		 2083 if (PTR_ERR(buf_desc) == -ENOMEM)
2084 break;
2085 if (IS_ERR(buf_desc))
a3fe3d01 2086 continue;
897e1c24 2087
3e034725 2088 buf_desc->used = 1;
faca5360 2089 mutex_lock(lock);
3e034725 2090 list_add(&buf_desc->list, buf_list);
faca5360 2091 mutex_unlock(lock);
3e034725 2092 break; /* found */
cd6851f3 2093 }
3e034725 2094
b33982c3 2095 if (IS_ERR(buf_desc))
72b7f6c4 2096 return PTR_ERR(buf_desc);
3e034725 2097
b9247544
KG		 2098 if (!is_smcd) {
2099 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
6d74c3a8 2100 smcr_buf_unuse(buf_desc, lgr);
b9247544
KG		 2101 return -ENOMEM;
2102 }
2103 }
2104
3e034725
UB		 2105 if (is_rmb) {
2106 conn->rmb_desc = buf_desc;
c45abf31
UB		 2107 conn->rmbe_size_short = bufsize_short;
2108 smc->sk.sk_rcvbuf = bufsize * 2;
5f08318f 2109 atomic_set(&conn->bytes_to_rcv, 0);
be244f28
HW		 2110 conn->rmbe_update_limit =
2111 smc_rmb_wnd_update_limit(buf_desc->len);
c6ba7c9b
HW		 2112 if (is_smcd)
2113 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
cd6851f3 2114 } else {
3e034725 2115 conn->sndbuf_desc = buf_desc;
3e034725
UB		 2116 smc->sk.sk_sndbuf = bufsize * 2;
2117 atomic_set(&conn->sndbuf_space, bufsize);
cd6851f3 2118 }
3e034725
UB		 2119 return 0;
2120}
2121
10428dd8
UB		 2122void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
2123{
741a49a4 2124 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
c6ba7c9b 2125 return;
387707fd 2126 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
10428dd8
UB		 2127}
2128
2129void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2130{
741a49a4 2131 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
c6ba7c9b 2132 return;
387707fd 2133 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
10428dd8
UB		 2134}
2135
2136void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2137{
b9247544 2138 int i;
10428dd8 2139
c6ba7c9b
HW		 2140 if (!conn->lgr || conn->lgr->is_smcd)
2141 return;
b9247544 2142 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 2143 if (!smc_link_active(&conn->lgr->lnk[i]))
b9247544
KG		 2144 continue;
2145 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2146 DMA_FROM_DEVICE);
2147 }
10428dd8
UB		 2148}
2149
2150void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
2151{
b9247544 2152 int i;
10428dd8 2153
c6ba7c9b
HW		 2154 if (!conn->lgr || conn->lgr->is_smcd)
2155 return;
b9247544 2156 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 2157 if (!smc_link_active(&conn->lgr->lnk[i]))
b9247544
KG		 2158 continue;
2159 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
2160 DMA_FROM_DEVICE);
2161 }
10428dd8
UB		 2162}
2163
3e034725
UB		 2164/* create the send and receive buffer for an SMC socket;
2165 * receive buffers are called RMBs;
2166 * (even though the SMC protocol allows more than one RMB-element per RMB,
2167 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2168 * extra RMB for every connection in a link group
2169 */
c6ba7c9b 2170int smc_buf_create(struct smc_sock *smc, bool is_smcd)
3e034725
UB		 2171{
2172 int rc;
2173
2174 /* create send buffer */
c6ba7c9b 2175 rc = __smc_buf_create(smc, is_smcd, false);
3e034725
UB		 2176 if (rc)
2177 return rc;
2178 /* create rmb */
c6ba7c9b 2179 rc = __smc_buf_create(smc, is_smcd, true);
fd7f3a74
KG		 2180 if (rc) {
2181 mutex_lock(&smc->conn.lgr->sndbufs_lock);
2182 list_del(&smc->conn.sndbuf_desc->list);
2183 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
6511aad3 2184 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
1d8df41d 2185 smc->conn.sndbuf_desc = NULL;
fd7f3a74 2186 }
3e034725 2187 return rc;
cd6851f3 2188}
bd4ad577
UB		 2189
2190static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2191{
2192 int i;
2193
2194 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2195 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2196 return i;
2197 }
2198 return -ENOSPC;
2199}
2200
ba21abd2
KG		 2201static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2202 u32 rkey)
2203{
2204 int i;
2205
2206 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2207 if (test_bit(i, lgr->rtokens_used_mask) &&
2208 lgr->rtokens[i][lnk_idx].rkey == rkey)
2209 return i;
2210 }
2211 return -ENOENT;
2212}
2213
2214/* set rtoken for a new link to an existing rmb */
2215void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2216 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2217{
2218 int rtok_idx;
2219
2220 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2221 if (rtok_idx == -ENOENT)
2222 return;
2223 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2224 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2225}
2226
2227/* set rtoken for a new link whose link_id is given */
2228void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2229 __be64 nw_vaddr, __be32 nw_rkey)
2230{
2231 u64 dma_addr = be64_to_cpu(nw_vaddr);
2232 u32 rkey = ntohl(nw_rkey);
2233 bool found = false;
2234 int link_idx;
2235
2236 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2237 if (lgr->lnk[link_idx].link_id == link_id) {
2238 found = true;
2239 break;
2240 }
2241 }
2242 if (!found)
2243 return;
2244 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2245 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2246}
2247
4ed75de5 2248/* add a new rtoken from peer */
387707fd 2249int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
bd4ad577 2250{
387707fd 2251 struct smc_link_group *lgr = smc_get_lgr(lnk);
4ed75de5
KG		 2252 u64 dma_addr = be64_to_cpu(nw_vaddr);
2253 u32 rkey = ntohl(nw_rkey);
bd4ad577
UB		 2254 int i;
2255
2256 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
387707fd
KG		 2257 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2258 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
bd4ad577 2259 test_bit(i, lgr->rtokens_used_mask)) {
4ed75de5
KG		 2260 /* already in list */
2261 return i;
2262 }
2263 }
2264 i = smc_rmb_reserve_rtoken_idx(lgr);
2265 if (i < 0)
2266 return i;
387707fd
KG		 2267 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2268 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
4ed75de5
KG		 2269 return i;
2270}
2271
e07d31dc 2272/* delete an rtoken from all links */
387707fd 2273int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
4ed75de5 2274{
387707fd 2275 struct smc_link_group *lgr = smc_get_lgr(lnk);
4ed75de5 2276 u32 rkey = ntohl(nw_rkey);
e07d31dc 2277 int i, j;
4ed75de5
KG		 2278
2279 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
387707fd 2280 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
4ed75de5 2281 test_bit(i, lgr->rtokens_used_mask)) {
e07d31dc
KG		 2282 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2283 lgr->rtokens[i][j].rkey = 0;
2284 lgr->rtokens[i][j].dma_addr = 0;
2285 }
4ed75de5 2286 clear_bit(i, lgr->rtokens_used_mask);
bd4ad577
UB		 2287 return 0;
2288 }
2289 }
4ed75de5
KG		 2290 return -ENOENT;
2291}
2292
2293/* save rkey and dma_addr received from peer during clc handshake */
2294int smc_rmb_rtoken_handling(struct smc_connection *conn,
e07d31dc 2295 struct smc_link *lnk,
4ed75de5
KG		 2296 struct smc_clc_msg_accept_confirm *clc)
2297{
3d9725a6
UB		 2298 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2299 clc->r0.rmb_rkey);
bd4ad577
UB		 2300 if (conn->rtoken_idx < 0)
2301 return conn->rtoken_idx;
bd4ad577
UB		 2302 return 0;
2303}
9fda3510 2304
c3d9494e
UB		 2305static void smc_core_going_away(void)
2306{
2307 struct smc_ib_device *smcibdev;
2308 struct smcd_dev *smcd;
2309
92f3cb0e 2310 mutex_lock(&smc_ib_devices.mutex);
c3d9494e
UB		 2311 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2312 int i;
2313
2314 for (i = 0; i < SMC_MAX_PORTS; i++)
2315 set_bit(i, smcibdev->ports_going_away);
2316 }
92f3cb0e 2317 mutex_unlock(&smc_ib_devices.mutex);
c3d9494e 2318
82087c03 2319 mutex_lock(&smcd_dev_list.mutex);
c3d9494e
UB		 2320 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2321 smcd->going_away = 1;
2322 }
82087c03 2323 mutex_unlock(&smcd_dev_list.mutex);
c3d9494e
UB		 2324}
2325
5421ec28
UB		 2326/* Clean up all SMC link groups */
2327static void smc_lgrs_shutdown(void)
9fda3510 2328{
a2351c5d 2329 struct smcd_dev *smcd;
9fda3510 2330
c3d9494e
UB		 2331 smc_core_going_away();
2332
0b29ec64 2333 smc_smcr_terminate_all(NULL);
a2351c5d 2334
82087c03 2335 mutex_lock(&smcd_dev_list.mutex);
a2351c5d 2336 list_for_each_entry(smcd, &smcd_dev_list.list, list)
5421ec28 2337 smc_smcd_terminate_all(smcd);
82087c03 2338 mutex_unlock(&smcd_dev_list.mutex);
9fda3510 2339}
5421ec28 2340
a33a803c
UB		 2341static int smc_core_reboot_event(struct notifier_block *this,
2342 unsigned long event, void *ptr)
2343{
2344 smc_lgrs_shutdown();
28a3b840 2345 smc_ib_unregister_client();
a33a803c
UB		 2346 return 0;
2347}
2348
2349static struct notifier_block smc_reboot_notifier = {
2350 .notifier_call = smc_core_reboot_event,
2351};
2352
6dabd405
UB		 2353int __init smc_core_init(void)
2354{
a33a803c 2355 return register_reboot_notifier(&smc_reboot_notifier);
6dabd405
UB		 2356}
2357
5421ec28
UB		 2358/* Called (from smc_exit) when module is removed */
2359void smc_core_exit(void)
2360{
a33a803c 2361 unregister_reboot_notifier(&smc_reboot_notifier);
5421ec28
UB		 2362 smc_lgrs_shutdown();
2363}
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