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Merge tag 'gpio-v5.9-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux...
[linux-2.6-block.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 <ubraun@linux.vnet.ibm.com>
10 */
11
12#include <linux/socket.h>
13#include <linux/if_vlan.h>
14#include <linux/random.h>
15#include <linux/workqueue.h>
6dabd405 16#include <linux/wait.h>
a33a803c 17#include <linux/reboot.h>
92f3cb0e 18#include <linux/mutex.h>
0cfdd8f9
UB		 19#include <net/tcp.h>
20#include <net/sock.h>
21#include <rdma/ib_verbs.h>
ddb457c6 22#include <rdma/ib_cache.h>
0cfdd8f9
UB		 23
24#include "smc.h"
25#include "smc_clc.h"
26#include "smc_core.h"
27#include "smc_ib.h"
f38ba179 28#include "smc_wr.h"
9bf9abea 29#include "smc_llc.h"
5f08318f 30#include "smc_cdc.h"
b38d7324 31#include "smc_close.h"
c6ba7c9b 32#include "smc_ism.h"
0cfdd8f9 33
5bc11ddb
UB		 34#define SMC_LGR_NUM_INCR 256
35#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
7f58a1ad 36#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
0d18a0cb 37#define SMC_LGR_FREE_DELAY_FAST (8 * HZ)
0cfdd8f9 38
9fda3510
HW		 39static struct smc_lgr_list smc_lgr_list = { /* established link groups */
40 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
41 .list = LIST_HEAD_INIT(smc_lgr_list.list),
42 .num = 0,
43};
9bf9abea 44
29115cef 45static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
6dabd405
UB		 46static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
47
6511aad3
HW		 48static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
49 struct smc_buf_desc *buf_desc);
5f78fe96 50static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
a6920d1d 51
541afa10 52static void smc_link_down_work(struct work_struct *work);
1f90a05d 53
a0a62ee1
UB		 54/* return head of link group list and its lock for a given link group */
55static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
56 spinlock_t **lgr_lock)
57{
58 if (lgr->is_smcd) {
59 *lgr_lock = &lgr->smcd->lgr_lock;
60 return &lgr->smcd->lgr_list;
61 }
62
63 *lgr_lock = &smc_lgr_list.lock;
64 return &smc_lgr_list.list;
65}
66
97cdbc42
KG		 67static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
68{
69 /* client link group creation always follows the server link group
70 * creation. For client use a somewhat higher removal delay time,
71 * otherwise there is a risk of out-of-sync link groups.
72 */
8e316b9e
UB		 73 if (!lgr->freeing && !lgr->freefast) {
74 mod_delayed_work(system_wq, &lgr->free_work,
75 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
76 SMC_LGR_FREE_DELAY_CLNT :
77 SMC_LGR_FREE_DELAY_SERV);
78 }
97cdbc42
KG		 79}
80
0d18a0cb
KG		 81void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
82{
8e316b9e
UB		 83 if (!lgr->freeing && !lgr->freefast) {
84 lgr->freefast = 1;
85 mod_delayed_work(system_wq, &lgr->free_work,
86 SMC_LGR_FREE_DELAY_FAST);
87 }
97cdbc42
KG		 88}
89
0cfdd8f9
UB		 90/* Register connection's alert token in our lookup structure.
91 * To use rbtrees we have to implement our own insert core.
92 * Requires @conns_lock
93 * @smc connection to register
94 * Returns 0 on success, != otherwise.
95 */
96static void smc_lgr_add_alert_token(struct smc_connection *conn)
97{
98 struct rb_node **link, *parent = NULL;
99 u32 token = conn->alert_token_local;
100
101 link = &conn->lgr->conns_all.rb_node;
102 while (*link) {
103 struct smc_connection *cur = rb_entry(*link,
104 struct smc_connection, alert_node);
105
106 parent = *link;
107 if (cur->alert_token_local > token)
108 link = &parent->rb_left;
109 else
110 link = &parent->rb_right;
111 }
112 /* Put the new node there */
113 rb_link_node(&conn->alert_node, parent, link);
114 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
115}
116
56bc3b20
KG		 117/* assign an SMC-R link to the connection */
118static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
119{
120 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
121 SMC_LNK_ACTIVE;
122 int i, j;
123
124 /* do link balancing */
125 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
126 struct smc_link *lnk = &conn->lgr->lnk[i];
127
ad6c111b 128 if (lnk->state != expected || lnk->link_is_asym)
56bc3b20
KG		 129 continue;
130 if (conn->lgr->role == SMC_CLNT) {
131 conn->lnk = lnk; /* temporary, SMC server assigns link*/
132 break;
133 }
134 if (conn->lgr->conns_num % 2) {
135 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
136 struct smc_link *lnk2;
137
138 lnk2 = &conn->lgr->lnk[j];
ad6c111b
KG		 139 if (lnk2->state == expected &&
140 !lnk2->link_is_asym) {
56bc3b20
KG		 141 conn->lnk = lnk2;
142 break;
143 }
144 }
145 }
146 if (!conn->lnk)
147 conn->lnk = lnk;
148 break;
149 }
150 if (!conn->lnk)
151 return SMC_CLC_DECL_NOACTLINK;
152 return 0;
153}
154
0cfdd8f9
UB		 155/* Register connection in link group by assigning an alert token
156 * registered in a search tree.
157 * Requires @conns_lock
158 * Note that '0' is a reserved value and not assigned.
159 */
56bc3b20 160static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
0cfdd8f9
UB		 161{
162 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
163 static atomic_t nexttoken = ATOMIC_INIT(0);
56bc3b20 164 int rc;
0cfdd8f9 165
56bc3b20
KG		 166 if (!conn->lgr->is_smcd) {
167 rc = smcr_lgr_conn_assign_link(conn, first);
168 if (rc)
169 return rc;
170 }
0cfdd8f9
UB		 171 /* find a new alert_token_local value not yet used by some connection
172 * in this link group
173 */
174 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
175 while (!conn->alert_token_local) {
176 conn->alert_token_local = atomic_inc_return(&nexttoken);
177 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
178 conn->alert_token_local = 0;
179 }
180 smc_lgr_add_alert_token(conn);
181 conn->lgr->conns_num++;
b9247544 182 return 0;
0cfdd8f9
UB		 183}
184
185/* Unregister connection and reset the alert token of the given connection<
186 */
187static void __smc_lgr_unregister_conn(struct smc_connection *conn)
188{
189 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
190 struct smc_link_group *lgr = conn->lgr;
191
192 rb_erase(&conn->alert_node, &lgr->conns_all);
193 lgr->conns_num--;
194 conn->alert_token_local = 0;
0cfdd8f9
UB		 195 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
196}
197
fb692ec4 198/* Unregister connection from lgr
0cfdd8f9
UB		 199 */
200static void smc_lgr_unregister_conn(struct smc_connection *conn)
201{
202 struct smc_link_group *lgr = conn->lgr;
0cfdd8f9 203
77f838ac
KG		 204 if (!lgr)
205 return;
0cfdd8f9
UB		 206 write_lock_bh(&lgr->conns_lock);
207 if (conn->alert_token_local) {
0cfdd8f9
UB		 208 __smc_lgr_unregister_conn(conn);
209 }
210 write_unlock_bh(&lgr->conns_lock);
2a0674ff 211 conn->lgr = NULL;
0cfdd8f9
UB		 212}
213
51e3dfa8
UB		 214void smc_lgr_cleanup_early(struct smc_connection *conn)
215{
216 struct smc_link_group *lgr = conn->lgr;
9ec6bf19
KG		 217 struct list_head *lgr_list;
218 spinlock_t *lgr_lock;
51e3dfa8
UB		 219
220 if (!lgr)
221 return;
222
223 smc_conn_free(conn);
9ec6bf19
KG		 224 lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
225 spin_lock_bh(lgr_lock);
226 /* do not use this link group for new connections */
227 if (!list_empty(lgr_list))
228 list_del_init(lgr_list);
229 spin_unlock_bh(lgr_lock);
51e3dfa8
UB		 230 smc_lgr_schedule_free_work_fast(lgr);
231}
232
a52bcc91
KG		 233static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
234{
235 int i;
236
237 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
238 struct smc_link *lnk = &lgr->lnk[i];
239
240 if (smc_link_usable(lnk))
241 lnk->state = SMC_LNK_INACTIVE;
242 }
6778a6be
KG		 243 wake_up_all(&lgr->llc_msg_waiter);
244 wake_up_all(&lgr->llc_flow_waiter);
a52bcc91
KG		 245}
246
3f3f0e36
UB		 247static void smc_lgr_free(struct smc_link_group *lgr);
248
0cfdd8f9
UB		 249static void smc_lgr_free_work(struct work_struct *work)
250{
251 struct smc_link_group *lgr = container_of(to_delayed_work(work),
252 struct smc_link_group,
253 free_work);
a0a62ee1 254 spinlock_t *lgr_lock;
0cfdd8f9
UB		 255 bool conns;
256
a0a62ee1
UB		 257 smc_lgr_list_head(lgr, &lgr_lock);
258 spin_lock_bh(lgr_lock);
8e316b9e
UB		 259 if (lgr->freeing) {
260 spin_unlock_bh(lgr_lock);
261 return;
262 }
0cfdd8f9
UB		 263 read_lock_bh(&lgr->conns_lock);
264 conns = RB_EMPTY_ROOT(&lgr->conns_all);
265 read_unlock_bh(&lgr->conns_lock);
266 if (!conns) { /* number of lgr connections is no longer zero */
a0a62ee1 267 spin_unlock_bh(lgr_lock);
0cfdd8f9
UB		 268 return;
269 }
8caa6544 270 list_del_init(&lgr->list); /* remove from smc_lgr_list */
8e316b9e
UB		 271 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
272 spin_unlock_bh(lgr_lock);
273 cancel_delayed_work(&lgr->free_work);
0d18a0cb 274
f3811fd7
KG		 275 if (!lgr->is_smcd && !lgr->terminating)
276 smc_llc_send_link_delete_all(lgr, true,
277 SMC_LLC_DEL_PROG_INIT_TERM);
42bfba9e 278 if (lgr->is_smcd && !lgr->terminating)
8e316b9e 279 smc_ism_signal_shutdown(lgr);
a52bcc91
KG		 280 if (!lgr->is_smcd)
281 smcr_lgr_link_deactivate_all(lgr);
8e316b9e 282 smc_lgr_free(lgr);
0cfdd8f9
UB		 283}
284
f528ba24
UB		 285static void smc_lgr_terminate_work(struct work_struct *work)
286{
287 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
288 terminate_work);
289
5f78fe96 290 __smc_lgr_terminate(lgr, true);
f528ba24
UB		 291}
292
026c381f
KG		 293/* return next unique link id for the lgr */
294static u8 smcr_next_link_id(struct smc_link_group *lgr)
295{
296 u8 link_id;
297 int i;
298
299 while (1) {
300 link_id = ++lgr->next_link_id;
301 if (!link_id) /* skip zero as link_id */
302 link_id = ++lgr->next_link_id;
303 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
d854fcbf 304 if (smc_link_usable(&lgr->lnk[i]) &&
026c381f
KG		 305 lgr->lnk[i].link_id == link_id)
306 continue;
307 }
308 break;
309 }
310 return link_id;
311}
312
336ba09f
KG		 313int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
314 u8 link_idx, struct smc_init_info *ini)
f3c1dedd
KG		 315{
316 u8 rndvec[3];
317 int rc;
318
319 get_device(&ini->ib_dev->ibdev->dev);
320 atomic_inc(&ini->ib_dev->lnk_cnt);
026c381f 321 lnk->link_id = smcr_next_link_id(lgr);
387707fd 322 lnk->lgr = lgr;
026c381f 323 lnk->link_idx = link_idx;
f3c1dedd
KG		 324 lnk->smcibdev = ini->ib_dev;
325 lnk->ibport = ini->ib_port;
326 lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
45fa8da0 327 smc_llc_link_set_uid(lnk);
541afa10 328 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
f3c1dedd
KG		 329 if (!ini->ib_dev->initialized) {
330 rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
331 if (rc)
332 goto out;
333 }
334 get_random_bytes(rndvec, sizeof(rndvec));
335 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
336 (rndvec[2] << 16);
337 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
338 ini->vlan_id, lnk->gid, &lnk->sgid_index);
339 if (rc)
340 goto out;
341 rc = smc_llc_link_init(lnk);
342 if (rc)
343 goto out;
344 rc = smc_wr_alloc_link_mem(lnk);
345 if (rc)
346 goto clear_llc_lnk;
347 rc = smc_ib_create_protection_domain(lnk);
348 if (rc)
349 goto free_link_mem;
350 rc = smc_ib_create_queue_pair(lnk);
351 if (rc)
352 goto dealloc_pd;
353 rc = smc_wr_create_link(lnk);
354 if (rc)
355 goto destroy_qp;
741a49a4 356 lnk->state = SMC_LNK_ACTIVATING;
f3c1dedd
KG		 357 return 0;
358
359destroy_qp:
360 smc_ib_destroy_queue_pair(lnk);
361dealloc_pd:
362 smc_ib_dealloc_protection_domain(lnk);
363free_link_mem:
364 smc_wr_free_link_mem(lnk);
365clear_llc_lnk:
0a99be43 366 smc_llc_link_clear(lnk, false);
f3c1dedd
KG		 367out:
368 put_device(&ini->ib_dev->ibdev->dev);
369 memset(lnk, 0, sizeof(struct smc_link));
d854fcbf 370 lnk->state = SMC_LNK_UNUSED;
f3c1dedd
KG		 371 if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
372 wake_up(&ini->ib_dev->lnks_deleted);
373 return rc;
374}
375
0cfdd8f9 376/* create a new SMC link group */
bc36d2fc 377static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
0cfdd8f9
UB		 378{
379 struct smc_link_group *lgr;
a2351c5d 380 struct list_head *lgr_list;
0cfdd8f9 381 struct smc_link *lnk;
a0a62ee1 382 spinlock_t *lgr_lock;
026c381f 383 u8 link_idx;
0cfdd8f9 384 int rc = 0;
cd6851f3 385 int i;
0cfdd8f9 386
bc36d2fc 387 if (ini->is_smcd && ini->vlan_id) {
7a62725a
KG		 388 if (smc_ism_get_vlan(ini->ism_dev, ini->vlan_id)) {
389 rc = SMC_CLC_DECL_ISMVLANERR;
c6ba7c9b 390 goto out;
7a62725a 391 }
c6ba7c9b
HW		 392 }
393
0cfdd8f9
UB		 394 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
395 if (!lgr) {
7a62725a 396 rc = SMC_CLC_DECL_MEM;
29ee2701 397 goto ism_put_vlan;
0cfdd8f9 398 }
bc36d2fc 399 lgr->is_smcd = ini->is_smcd;
517c300e 400 lgr->sync_err = 0;
8e316b9e
UB		 401 lgr->terminating = 0;
402 lgr->freefast = 0;
403 lgr->freeing = 0;
bc36d2fc 404 lgr->vlan_id = ini->vlan_id;
faca5360
KG		 405 mutex_init(&lgr->sndbufs_lock);
406 mutex_init(&lgr->rmbs_lock);
c6ba7c9b 407 rwlock_init(&lgr->conns_lock);
cd6851f3
UB		 408 for (i = 0; i < SMC_RMBE_SIZES; i++) {
409 INIT_LIST_HEAD(&lgr->sndbufs[i]);
410 INIT_LIST_HEAD(&lgr->rmbs[i]);
411 }
026c381f 412 lgr->next_link_id = 0;
9fda3510
HW		 413 smc_lgr_list.num += SMC_LGR_NUM_INCR;
414 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
0cfdd8f9 415 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
f528ba24 416 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
0cfdd8f9 417 lgr->conns_all = RB_ROOT;
bc36d2fc 418 if (ini->is_smcd) {
c6ba7c9b 419 /* SMC-D specific settings */
b3cb53c0 420 get_device(&ini->ism_dev->dev);
bc36d2fc
KG		 421 lgr->peer_gid = ini->ism_gid;
422 lgr->smcd = ini->ism_dev;
a2351c5d 423 lgr_list = &ini->ism_dev->lgr_list;
a0a62ee1 424 lgr_lock = &lgr->smcd->lgr_lock;
50c6b20e 425 lgr->peer_shutdown = 0;
5edd6b9c 426 atomic_inc(&ini->ism_dev->lgr_cnt);
c6ba7c9b
HW		 427 } else {
428 /* SMC-R specific settings */
429 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
bc36d2fc
KG		 430 memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
431 SMC_SYSTEMID_LEN);
35dcf7ec
KG		 432 memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
433 SMC_MAX_PNETID_LEN);
00a049cf
KG		 434 smc_llc_lgr_init(lgr, smc);
435
026c381f
KG		 436 link_idx = SMC_SINGLE_LINK;
437 lnk = &lgr->lnk[link_idx];
438 rc = smcr_link_init(lgr, lnk, link_idx, ini);
c6ba7c9b
HW		 439 if (rc)
440 goto free_lgr;
f3c1dedd
KG		 441 lgr_list = &smc_lgr_list.list;
442 lgr_lock = &smc_lgr_list.lock;
6dabd405 443 atomic_inc(&lgr_cnt);
c6ba7c9b 444 }
0cfdd8f9 445 smc->conn.lgr = lgr;
a0a62ee1 446 spin_lock_bh(lgr_lock);
a9e44502 447 list_add_tail(&lgr->list, lgr_list);
a0a62ee1 448 spin_unlock_bh(lgr_lock);
f38ba179
UB		 449 return 0;
450
451free_lgr:
452 kfree(lgr);
29ee2701
UB		 453ism_put_vlan:
454 if (ini->is_smcd && ini->vlan_id)
455 smc_ism_put_vlan(ini->ism_dev, ini->vlan_id);
0cfdd8f9 456out:
7a62725a
KG		 457 if (rc < 0) {
458 if (rc == -ENOMEM)
459 rc = SMC_CLC_DECL_MEM;
460 else
461 rc = SMC_CLC_DECL_INTERR;
462 }
0cfdd8f9
UB		 463 return rc;
464}
465
c6f02ebe
KG		 466static int smc_write_space(struct smc_connection *conn)
467{
468 int buffer_len = conn->peer_rmbe_size;
469 union smc_host_cursor prod;
470 union smc_host_cursor cons;
471 int space;
472
473 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
474 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
475 /* determine rx_buf space */
476 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
477 return space;
478}
479
b8ded9de
KG		 480static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
481 struct smc_wr_buf *wr_buf)
c6f02ebe
KG		 482{
483 struct smc_connection *conn = &smc->conn;
484 union smc_host_cursor cons, fin;
485 int rc = 0;
486 int diff;
487
488 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
489 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
490 /* set prod cursor to old state, enforce tx_rdma_writes() */
491 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
492 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
493
494 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
495 /* cons cursor advanced more than fin, and prod was set
496 * fin above, so now prod is smaller than cons. Fix that.
497 */
498 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
499 smc_curs_add(conn->sndbuf_desc->len,
500 &conn->tx_curs_sent, diff);
501 smc_curs_add(conn->sndbuf_desc->len,
502 &conn->tx_curs_fin, diff);
503
504 smp_mb__before_atomic();
505 atomic_add(diff, &conn->sndbuf_space);
506 smp_mb__after_atomic();
507
508 smc_curs_add(conn->peer_rmbe_size,
509 &conn->local_tx_ctrl.prod, diff);
510 smc_curs_add(conn->peer_rmbe_size,
511 &conn->local_tx_ctrl_fin, diff);
512 }
513 /* recalculate, value is used by tx_rdma_writes() */
514 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
515
516 if (smc->sk.sk_state != SMC_INIT &&
517 smc->sk.sk_state != SMC_CLOSED) {
b8ded9de 518 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
c6f02ebe
KG		 519 if (!rc) {
520 schedule_delayed_work(&conn->tx_work, 0);
521 smc->sk.sk_data_ready(&smc->sk);
522 }
b8ded9de
KG		 523 } else {
524 smc_wr_tx_put_slot(conn->lnk,
525 (struct smc_wr_tx_pend_priv *)pend);
c6f02ebe
KG		 526 }
527 return rc;
528}
529
530struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
531 struct smc_link *from_lnk, bool is_dev_err)
532{
533 struct smc_link *to_lnk = NULL;
b8ded9de 534 struct smc_cdc_tx_pend *pend;
c6f02ebe 535 struct smc_connection *conn;
b8ded9de 536 struct smc_wr_buf *wr_buf;
c6f02ebe
KG		 537 struct smc_sock *smc;
538 struct rb_node *node;
539 int i, rc = 0;
540
541 /* link is inactive, wake up tx waiters */
542 smc_wr_wakeup_tx_wait(from_lnk);
543
544 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 545 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
c6f02ebe
KG		 546 continue;
547 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
548 from_lnk->ibport == lgr->lnk[i].ibport) {
549 continue;
550 }
551 to_lnk = &lgr->lnk[i];
552 break;
553 }
554 if (!to_lnk) {
555 smc_lgr_terminate_sched(lgr);
556 return NULL;
557 }
558again:
559 read_lock_bh(&lgr->conns_lock);
560 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
561 conn = rb_entry(node, struct smc_connection, alert_node);
562 if (conn->lnk != from_lnk)
563 continue;
564 smc = container_of(conn, struct smc_sock, conn);
565 /* conn->lnk not yet set in SMC_INIT state */
566 if (smc->sk.sk_state == SMC_INIT)
567 continue;
568 if (smc->sk.sk_state == SMC_CLOSED ||
569 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
570 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
571 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
572 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
573 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
574 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
575 smc->sk.sk_state == SMC_PEERABORTWAIT ||
576 smc->sk.sk_state == SMC_PROCESSABORT) {
577 spin_lock_bh(&conn->send_lock);
578 conn->lnk = to_lnk;
579 spin_unlock_bh(&conn->send_lock);
580 continue;
581 }
582 sock_hold(&smc->sk);
583 read_unlock_bh(&lgr->conns_lock);
b8ded9de
KG		 584 /* pre-fetch buffer outside of send_lock, might sleep */
585 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
586 if (rc) {
587 smcr_link_down_cond_sched(to_lnk);
588 return NULL;
589 }
c6f02ebe
KG		 590 /* avoid race with smcr_tx_sndbuf_nonempty() */
591 spin_lock_bh(&conn->send_lock);
592 conn->lnk = to_lnk;
b8ded9de 593 rc = smc_switch_cursor(smc, pend, wr_buf);
c6f02ebe
KG		 594 spin_unlock_bh(&conn->send_lock);
595 sock_put(&smc->sk);
596 if (rc) {
597 smcr_link_down_cond_sched(to_lnk);
598 return NULL;
599 }
600 goto again;
601 }
602 read_unlock_bh(&lgr->conns_lock);
603 return to_lnk;
604}
605
b9247544 606static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
6d74c3a8 607 struct smc_link_group *lgr)
b9247544 608{
d5500667
KG		 609 int rc;
610
b9247544
KG		 611 if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
612 /* unregister rmb with peer */
d5500667
KG		 613 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
614 if (!rc) {
615 /* protect against smc_llc_cli_rkey_exchange() */
616 mutex_lock(&lgr->llc_conf_mutex);
617 smc_llc_do_delete_rkey(lgr, rmb_desc);
618 rmb_desc->is_conf_rkey = false;
619 mutex_unlock(&lgr->llc_conf_mutex);
620 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
621 }
b9247544 622 }
d5500667 623
b9247544
KG		 624 if (rmb_desc->is_reg_err) {
625 /* buf registration failed, reuse not possible */
faca5360 626 mutex_lock(&lgr->rmbs_lock);
b9247544 627 list_del(&rmb_desc->list);
faca5360 628 mutex_unlock(&lgr->rmbs_lock);
b9247544
KG		 629
630 smc_buf_free(lgr, true, rmb_desc);
631 } else {
632 rmb_desc->used = 0;
633 }
634}
635
fb692ec4
KG		 636static void smc_buf_unuse(struct smc_connection *conn,
637 struct smc_link_group *lgr)
cd6851f3 638{
69cb7dc0 639 if (conn->sndbuf_desc)
cd6851f3 640 conn->sndbuf_desc->used = 0;
b9247544
KG		 641 if (conn->rmb_desc && lgr->is_smcd)
642 conn->rmb_desc->used = 0;
643 else if (conn->rmb_desc)
6d74c3a8 644 smcr_buf_unuse(conn->rmb_desc, lgr);
cd6851f3
UB		 645}
646
0cfdd8f9
UB		 647/* remove a finished connection from its link group */
648void smc_conn_free(struct smc_connection *conn)
649{
fb692ec4
KG		 650 struct smc_link_group *lgr = conn->lgr;
651
652 if (!lgr)
0cfdd8f9 653 return;
fb692ec4 654 if (lgr->is_smcd) {
42bfba9e
UB		 655 if (!list_empty(&lgr->list))
656 smc_ism_unset_conn(conn);
be244f28
HW		 657 tasklet_kill(&conn->rx_tsklet);
658 } else {
c6ba7c9b 659 smc_cdc_tx_dismiss_slots(conn);
b286a065
KG		 660 if (current_work() != &conn->abort_work)
661 cancel_work_sync(&conn->abort_work);
be244f28 662 }
2a0674ff
UB		 663 if (!list_empty(&lgr->list)) {
664 smc_lgr_unregister_conn(conn);
665 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
666 }
fb692ec4
KG		 667
668 if (!lgr->conns_num)
669 smc_lgr_schedule_free_work(lgr);
0cfdd8f9
UB		 670}
671
4a3641c1
KG		 672/* unregister a link from a buf_desc */
673static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
674 struct smc_link *lnk)
675{
676 if (is_rmb)
677 buf_desc->is_reg_mr[lnk->link_idx] = false;
678 if (!buf_desc->is_map_ib[lnk->link_idx])
679 return;
680 if (is_rmb) {
681 if (buf_desc->mr_rx[lnk->link_idx]) {
682 smc_ib_put_memory_region(
683 buf_desc->mr_rx[lnk->link_idx]);
684 buf_desc->mr_rx[lnk->link_idx] = NULL;
685 }
686 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
687 } else {
688 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
689 }
690 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
691 buf_desc->is_map_ib[lnk->link_idx] = false;
692}
693
694/* unmap all buffers of lgr for a deleted link */
695static void smcr_buf_unmap_lgr(struct smc_link *lnk)
696{
697 struct smc_link_group *lgr = lnk->lgr;
698 struct smc_buf_desc *buf_desc, *bf;
699 int i;
700
701 for (i = 0; i < SMC_RMBE_SIZES; i++) {
702 mutex_lock(&lgr->rmbs_lock);
703 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
704 smcr_buf_unmap_link(buf_desc, true, lnk);
705 mutex_unlock(&lgr->rmbs_lock);
706 mutex_lock(&lgr->sndbufs_lock);
707 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
708 list)
709 smcr_buf_unmap_link(buf_desc, false, lnk);
710 mutex_unlock(&lgr->sndbufs_lock);
711 }
712}
713
714static void smcr_rtoken_clear_link(struct smc_link *lnk)
715{
716 struct smc_link_group *lgr = lnk->lgr;
717 int i;
718
719 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
720 lgr->rtokens[i][lnk->link_idx].rkey = 0;
721 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
722 }
723}
724
d5500667 725/* must be called under lgr->llc_conf_mutex lock */
0a99be43 726void smcr_link_clear(struct smc_link *lnk, bool log)
0cfdd8f9 727{
d854fcbf
KG		 728 struct smc_ib_device *smcibdev;
729
4a3641c1 730 if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
b9247544 731 return;
0cfdd8f9 732 lnk->peer_qpn = 0;
0a99be43 733 smc_llc_link_clear(lnk, log);
4a3641c1
KG		 734 smcr_buf_unmap_lgr(lnk);
735 smcr_rtoken_clear_link(lnk);
bd4ad577 736 smc_ib_modify_qp_reset(lnk);
f38ba179 737 smc_wr_free_link(lnk);
bd4ad577
UB		 738 smc_ib_destroy_queue_pair(lnk);
739 smc_ib_dealloc_protection_domain(lnk);
f38ba179 740 smc_wr_free_link_mem(lnk);
f3c1dedd 741 put_device(&lnk->smcibdev->ibdev->dev);
d854fcbf
KG		 742 smcibdev = lnk->smcibdev;
743 memset(lnk, 0, sizeof(struct smc_link));
744 lnk->state = SMC_LNK_UNUSED;
745 if (!atomic_dec_return(&smcibdev->lnk_cnt))
746 wake_up(&smcibdev->lnks_deleted);
0cfdd8f9
UB		 747}
748
c6ba7c9b
HW		 749static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
750 struct smc_buf_desc *buf_desc)
cd6851f3 751{
b9247544 752 int i;
6511aad3 753
4a3641c1
KG		 754 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
755 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
387707fd 756
2ef4f27a
SR		 757 if (buf_desc->pages)
758 __free_pages(buf_desc->pages, buf_desc->order);
3e034725 759 kfree(buf_desc);
cd6851f3
UB		 760}
761
c6ba7c9b
HW		 762static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
763 struct smc_buf_desc *buf_desc)
764{
be244f28
HW		 765 if (is_dmb) {
766 /* restore original buf len */
767 buf_desc->len += sizeof(struct smcd_cdc_msg);
c6ba7c9b 768 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
be244f28 769 } else {
c6ba7c9b 770 kfree(buf_desc->cpu_addr);
be244f28 771 }
c6ba7c9b
HW		 772 kfree(buf_desc);
773}
774
775static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
776 struct smc_buf_desc *buf_desc)
777{
778 if (lgr->is_smcd)
779 smcd_buf_free(lgr, is_rmb, buf_desc);
780 else
781 smcr_buf_free(lgr, is_rmb, buf_desc);
782}
783
3e034725 784static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
cd6851f3 785{
3e034725
UB		 786 struct smc_buf_desc *buf_desc, *bf_desc;
787 struct list_head *buf_list;
cd6851f3
UB		 788 int i;
789
790 for (i = 0; i < SMC_RMBE_SIZES; i++) {
3e034725
UB		 791 if (is_rmb)
792 buf_list = &lgr->rmbs[i];
793 else
794 buf_list = &lgr->sndbufs[i];
795 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
cd6851f3 796 list) {
3e034725 797 list_del(&buf_desc->list);
6511aad3 798 smc_buf_free(lgr, is_rmb, buf_desc);
cd6851f3
UB		 799 }
800 }
801}
802
3e034725
UB		 803static void smc_lgr_free_bufs(struct smc_link_group *lgr)
804{
805 /* free send buffers */
806 __smc_lgr_free_bufs(lgr, false);
807 /* free rmbs */
808 __smc_lgr_free_bufs(lgr, true);
809}
810
0cfdd8f9 811/* remove a link group */
3f3f0e36 812static void smc_lgr_free(struct smc_link_group *lgr)
0cfdd8f9 813{
b9247544
KG		 814 int i;
815
a52bcc91
KG		 816 if (!lgr->is_smcd) {
817 mutex_lock(&lgr->llc_conf_mutex);
818 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
819 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
0a99be43 820 smcr_link_clear(&lgr->lnk[i], false);
a52bcc91
KG		 821 }
822 mutex_unlock(&lgr->llc_conf_mutex);
823 smc_llc_lgr_clear(lgr);
824 }
825
3e034725 826 smc_lgr_free_bufs(lgr);
b3cb53c0 827 if (lgr->is_smcd) {
42bfba9e
UB		 828 if (!lgr->terminating) {
829 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
830 put_device(&lgr->smcd->dev);
831 }
5edd6b9c
UB		 832 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
833 wake_up(&lgr->smcd->lgrs_deleted);
b3cb53c0 834 } else {
6dabd405
UB		 835 if (!atomic_dec_return(&lgr_cnt))
836 wake_up(&lgrs_deleted);
b3cb53c0 837 }
0cfdd8f9
UB		 838 kfree(lgr);
839}
840
42bfba9e
UB		 841static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
842{
843 int i;
844
845 for (i = 0; i < SMC_RMBE_SIZES; i++) {
846 struct smc_buf_desc *buf_desc;
847
848 list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
849 buf_desc->len += sizeof(struct smcd_cdc_msg);
850 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
851 }
852 }
853}
854
2a0674ff
UB		 855static void smc_sk_wake_ups(struct smc_sock *smc)
856{
857 smc->sk.sk_write_space(&smc->sk);
858 smc->sk.sk_data_ready(&smc->sk);
859 smc->sk.sk_state_change(&smc->sk);
860}
861
862/* kill a connection */
5421ec28 863static void smc_conn_kill(struct smc_connection *conn, bool soft)
2a0674ff
UB		 864{
865 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
866
50c6b20e
UB		 867 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
868 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
869 else
870 smc_close_abort(conn);
2a0674ff 871 conn->killed = 1;
50c6b20e 872 smc->sk.sk_err = ECONNABORTED;
2a0674ff 873 smc_sk_wake_ups(smc);
42bfba9e
UB		 874 if (conn->lgr->is_smcd) {
875 smc_ism_unset_conn(conn);
5421ec28
UB		 876 if (soft)
877 tasklet_kill(&conn->rx_tsklet);
878 else
879 tasklet_unlock_wait(&conn->rx_tsklet);
6a37ad3d
UB		 880 } else {
881 smc_cdc_tx_dismiss_slots(conn);
42bfba9e 882 }
2a0674ff 883 smc_lgr_unregister_conn(conn);
81cf4f47 884 smc_close_active_abort(smc);
2a0674ff
UB		 885}
886
42bfba9e
UB		 887static void smc_lgr_cleanup(struct smc_link_group *lgr)
888{
889 if (lgr->is_smcd) {
890 smc_ism_signal_shutdown(lgr);
891 smcd_unregister_all_dmbs(lgr);
892 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
893 put_device(&lgr->smcd->dev);
894 } else {
3e0c40af
KG		 895 u32 rsn = lgr->llc_termination_rsn;
896
897 if (!rsn)
898 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
899 smc_llc_send_link_delete_all(lgr, false, rsn);
a52bcc91 900 smcr_lgr_link_deactivate_all(lgr);
42bfba9e
UB		 901 }
902}
903
ba952060
KG		 904/* terminate link group
905 * @soft: true if link group shutdown can take its time
906 * false if immediate link group shutdown is required
907 */
5421ec28 908static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
0cfdd8f9
UB		 909{
910 struct smc_connection *conn;
b38d7324 911 struct smc_sock *smc;
0cfdd8f9
UB		 912 struct rb_node *node;
913
517c300e
KG		 914 if (lgr->terminating)
915 return; /* lgr already terminating */
a52bcc91
KG		 916 /* cancel free_work sync, will terminate when lgr->freeing is set */
917 cancel_delayed_work_sync(&lgr->free_work);
517c300e 918 lgr->terminating = 1;
0cfdd8f9 919
69318b52
UB		 920 /* kill remaining link group connections */
921 read_lock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 922 node = rb_first(&lgr->conns_all);
923 while (node) {
69318b52 924 read_unlock_bh(&lgr->conns_lock);
0cfdd8f9 925 conn = rb_entry(node, struct smc_connection, alert_node);
b38d7324 926 smc = container_of(conn, struct smc_sock, conn);
81cf4f47 927 sock_hold(&smc->sk); /* sock_put below */
69318b52 928 lock_sock(&smc->sk);
5421ec28 929 smc_conn_kill(conn, soft);
69318b52 930 release_sock(&smc->sk);
81cf4f47 931 sock_put(&smc->sk); /* sock_hold above */
69318b52 932 read_lock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 933 node = rb_first(&lgr->conns_all);
934 }
69318b52 935 read_unlock_bh(&lgr->conns_lock);
42bfba9e 936 smc_lgr_cleanup(lgr);
a52bcc91 937 smc_lgr_free(lgr);
0cfdd8f9
UB		 938}
939
5f78fe96
KG		 940/* unlink link group and schedule termination */
941void smc_lgr_terminate_sched(struct smc_link_group *lgr)
b9f227c3 942{
a0a62ee1
UB		 943 spinlock_t *lgr_lock;
944
945 smc_lgr_list_head(lgr, &lgr_lock);
946 spin_lock_bh(lgr_lock);
3739707c 947 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
8caa6544
UB		 948 spin_unlock_bh(lgr_lock);
949 return; /* lgr already terminating */
950 }
951 list_del_init(&lgr->list);
a52bcc91 952 lgr->freeing = 1;
a0a62ee1 953 spin_unlock_bh(lgr_lock);
5f78fe96 954 schedule_work(&lgr->terminate_work);
b9f227c3
HW		 955}
956
5421ec28 957/* Called when peer lgr shutdown (regularly or abnormally) is received */
0512f69e 958void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
c6ba7c9b
HW		 959{
960 struct smc_link_group *lgr, *l;
961 LIST_HEAD(lgr_free_list);
962
963 /* run common cleanup function and build free list */
a0a62ee1 964 spin_lock_bh(&dev->lgr_lock);
a2351c5d
UB		 965 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
966 if ((!peer_gid || lgr->peer_gid == peer_gid) &&
0512f69e 967 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
50c6b20e
UB		 968 if (peer_gid) /* peer triggered termination */
969 lgr->peer_shutdown = 1;
c6ba7c9b 970 list_move(&lgr->list, &lgr_free_list);
a52bcc91 971 lgr->freeing = 1;
c6ba7c9b
HW		 972 }
973 }
a0a62ee1 974 spin_unlock_bh(&dev->lgr_lock);
c6ba7c9b
HW		 975
976 /* cancel the regular free workers and actually free lgrs */
977 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
978 list_del_init(&lgr->list);
50c6b20e 979 schedule_work(&lgr->terminate_work);
c6ba7c9b
HW		 980 }
981}
982
5421ec28
UB		 983/* Called when an SMCD device is removed or the smc module is unloaded */
984void smc_smcd_terminate_all(struct smcd_dev *smcd)
985{
986 struct smc_link_group *lgr, *lg;
987 LIST_HEAD(lgr_free_list);
988
989 spin_lock_bh(&smcd->lgr_lock);
990 list_splice_init(&smcd->lgr_list, &lgr_free_list);
991 list_for_each_entry(lgr, &lgr_free_list, list)
992 lgr->freeing = 1;
993 spin_unlock_bh(&smcd->lgr_lock);
994
995 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
996 list_del_init(&lgr->list);
997 __smc_lgr_terminate(lgr, false);
998 }
5edd6b9c
UB		 999
1000 if (atomic_read(&smcd->lgr_cnt))
1001 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
5421ec28
UB		 1002}
1003
0b29ec64
UB		 1004/* Called when an SMCR device is removed or the smc module is unloaded.
1005 * If smcibdev is given, all SMCR link groups using this device are terminated.
1006 * If smcibdev is NULL, all SMCR link groups are terminated.
1007 */
1008void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1009{
1010 struct smc_link_group *lgr, *lg;
1011 LIST_HEAD(lgr_free_list);
b9247544 1012 int i;
0b29ec64
UB		 1013
1014 spin_lock_bh(&smc_lgr_list.lock);
1015 if (!smcibdev) {
1016 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1017 list_for_each_entry(lgr, &lgr_free_list, list)
1018 lgr->freeing = 1;
1019 } else {
1020 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
b9247544 1021 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
87523930
KG		 1022 if (lgr->lnk[i].smcibdev == smcibdev)
1023 smcr_link_down_cond_sched(&lgr->lnk[i]);
0b29ec64
UB		 1024 }
1025 }
1026 }
1027 spin_unlock_bh(&smc_lgr_list.lock);
1028
1029 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1030 list_del_init(&lgr->list);
3e0c40af 1031 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
0b29ec64
UB		 1032 __smc_lgr_terminate(lgr, false);
1033 }
6dabd405
UB		 1034
1035 if (smcibdev) {
1036 if (atomic_read(&smcibdev->lnk_cnt))
1037 wait_event(smcibdev->lnks_deleted,
1038 !atomic_read(&smcibdev->lnk_cnt));
1039 } else {
1040 if (atomic_read(&lgr_cnt))
1041 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1042 }
0b29ec64
UB		 1043}
1044
ad6c111b
KG		 1045/* set new lgr type and clear all asymmetric link tagging */
1046void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1047{
0a99be43 1048 char *lgr_type = "";
ad6c111b
KG		 1049 int i;
1050
1051 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1052 if (smc_link_usable(&lgr->lnk[i]))
1053 lgr->lnk[i].link_is_asym = false;
0a99be43
KG		 1054 if (lgr->type == new_type)
1055 return;
ad6c111b 1056 lgr->type = new_type;
0a99be43
KG		 1057
1058 switch (lgr->type) {
1059 case SMC_LGR_NONE:
1060 lgr_type = "NONE";
1061 break;
1062 case SMC_LGR_SINGLE:
1063 lgr_type = "SINGLE";
1064 break;
1065 case SMC_LGR_SYMMETRIC:
1066 lgr_type = "SYMMETRIC";
1067 break;
1068 case SMC_LGR_ASYMMETRIC_PEER:
1069 lgr_type = "ASYMMETRIC_PEER";
1070 break;
1071 case SMC_LGR_ASYMMETRIC_LOCAL:
1072 lgr_type = "ASYMMETRIC_LOCAL";
1073 break;
1074 }
1075 pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
1076 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
1077 lgr_type, lgr->pnet_id);
ad6c111b
KG		 1078}
1079
1080/* set new lgr type and tag a link as asymmetric */
1081void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1082 enum smc_lgr_type new_type, int asym_lnk_idx)
1083{
1084 smcr_lgr_set_type(lgr, new_type);
1085 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1086}
1087
b286a065
KG		 1088/* abort connection, abort_work scheduled from tasklet context */
1089static void smc_conn_abort_work(struct work_struct *work)
1090{
1091 struct smc_connection *conn = container_of(work,
1092 struct smc_connection,
1093 abort_work);
1094 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1095
1096 smc_conn_kill(conn, true);
1097 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1098}
1099
1f90a05d
KG		 1100void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1101{
1f90a05d
KG		 1102 struct smc_link_group *lgr, *n;
1103
1104 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
c48254fa
KG		 1105 struct smc_link *link;
1106
1f90a05d
KG		 1107 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1108 SMC_MAX_PNETID_LEN) ||
1109 lgr->type == SMC_LGR_SYMMETRIC ||
1110 lgr->type == SMC_LGR_ASYMMETRIC_PEER)
1111 continue;
c48254fa
KG		 1112
1113 /* trigger local add link processing */
1114 link = smc_llc_usable_link(lgr);
1115 if (link)
1116 smc_llc_add_link_local(link);
1f90a05d
KG		 1117 }
1118}
1119
541afa10
KG		 1120/* link is down - switch connections to alternate link,
1121 * must be called under lgr->llc_conf_mutex lock
1122 */
1123static void smcr_link_down(struct smc_link *lnk)
1124{
1125 struct smc_link_group *lgr = lnk->lgr;
1126 struct smc_link *to_lnk;
1127 int del_link_id;
1128
1129 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1130 return;
1131
1132 smc_ib_modify_qp_reset(lnk);
c6f02ebe 1133 to_lnk = smc_switch_conns(lgr, lnk, true);
541afa10 1134 if (!to_lnk) { /* no backup link available */
0a99be43 1135 smcr_link_clear(lnk, true);
541afa10
KG		 1136 return;
1137 }
ad6c111b 1138 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
541afa10
KG		 1139 del_link_id = lnk->link_id;
1140
1141 if (lgr->role == SMC_SERV) {
1142 /* trigger local delete link processing */
4dadd151 1143 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
541afa10
KG		 1144 } else {
1145 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1146 /* another llc task is ongoing */
1147 mutex_unlock(&lgr->llc_conf_mutex);
6778a6be
KG		 1148 wait_event_timeout(lgr->llc_flow_waiter,
1149 (list_empty(&lgr->list) ||
1150 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
541afa10
KG		 1151 SMC_LLC_WAIT_TIME);
1152 mutex_lock(&lgr->llc_conf_mutex);
1153 }
68fd8942 1154 if (!list_empty(&lgr->list)) {
6778a6be
KG		 1155 smc_llc_send_delete_link(to_lnk, del_link_id,
1156 SMC_LLC_REQ, true,
1157 SMC_LLC_DEL_LOST_PATH);
68fd8942
KG		 1158 smcr_link_clear(lnk, true);
1159 }
6778a6be 1160 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
541afa10
KG		 1161 }
1162}
1163
1164/* must be called under lgr->llc_conf_mutex lock */
1165void smcr_link_down_cond(struct smc_link *lnk)
1166{
1167 if (smc_link_downing(&lnk->state))
1168 smcr_link_down(lnk);
1169}
1170
1171/* will get the lgr->llc_conf_mutex lock */
1172void smcr_link_down_cond_sched(struct smc_link *lnk)
1173{
1174 if (smc_link_downing(&lnk->state))
1175 schedule_work(&lnk->link_down_wrk);
1176}
1177
1178void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1179{
1180 struct smc_link_group *lgr, *n;
1181 int i;
1182
1183 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1184 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1185 SMC_MAX_PNETID_LEN))
1186 continue; /* lgr is not affected */
1187 if (list_empty(&lgr->list))
1188 continue;
1189 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1190 struct smc_link *lnk = &lgr->lnk[i];
1191
1192 if (smc_link_usable(lnk) &&
1193 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1194 smcr_link_down_cond_sched(lnk);
1195 }
1196 }
1197}
1198
541afa10
KG		 1199static void smc_link_down_work(struct work_struct *work)
1200{
1201 struct smc_link *link = container_of(work, struct smc_link,
1202 link_down_wrk);
1203 struct smc_link_group *lgr = link->lgr;
1204
1205 if (list_empty(&lgr->list))
1206 return;
6778a6be 1207 wake_up_all(&lgr->llc_msg_waiter);
541afa10
KG		 1208 mutex_lock(&lgr->llc_conf_mutex);
1209 smcr_link_down(link);
1210 mutex_unlock(&lgr->llc_conf_mutex);
1211}
1212
0cfdd8f9
UB		 1213/* Determine vlan of internal TCP socket.
1214 * @vlan_id: address to store the determined vlan id into
1215 */
bc36d2fc 1216int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
0cfdd8f9
UB		 1217{
1218 struct dst_entry *dst = sk_dst_get(clcsock->sk);
cb9d43f6
UB		 1219 struct net_device *ndev;
1220 int i, nest_lvl, rc = 0;
0cfdd8f9 1221
bc36d2fc 1222 ini->vlan_id = 0;
0cfdd8f9
UB		 1223 if (!dst) {
1224 rc = -ENOTCONN;
1225 goto out;
1226 }
1227 if (!dst->dev) {
1228 rc = -ENODEV;
1229 goto out_rel;
1230 }
1231
cb9d43f6
UB		 1232 ndev = dst->dev;
1233 if (is_vlan_dev(ndev)) {
bc36d2fc 1234 ini->vlan_id = vlan_dev_vlan_id(ndev);
cb9d43f6
UB		 1235 goto out_rel;
1236 }
1237
1238 rtnl_lock();
f3b0a18b 1239 nest_lvl = ndev->lower_level;
cb9d43f6
UB		 1240 for (i = 0; i < nest_lvl; i++) {
1241 struct list_head *lower = &ndev->adj_list.lower;
1242
1243 if (list_empty(lower))
1244 break;
1245 lower = lower->next;
1246 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
1247 if (is_vlan_dev(ndev)) {
bc36d2fc 1248 ini->vlan_id = vlan_dev_vlan_id(ndev);
cb9d43f6
UB		 1249 break;
1250 }
1251 }
1252 rtnl_unlock();
0cfdd8f9
UB		 1253
1254out_rel:
1255 dst_release(dst);
1256out:
1257 return rc;
1258}
1259
c6ba7c9b
HW		 1260static bool smcr_lgr_match(struct smc_link_group *lgr,
1261 struct smc_clc_msg_local *lcl,
ee05ff7a 1262 enum smc_lgr_role role, u32 clcqpn)
0cfdd8f9 1263{
b9247544
KG		 1264 int i;
1265
1266 if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
1267 lgr->role != role)
1268 return false;
1269
1270 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 1271 if (!smc_link_active(&lgr->lnk[i]))
b9247544
KG		 1272 continue;
1273 if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
1274 !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
1275 !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
1276 return true;
1277 }
1278 return false;
c6ba7c9b 1279}
0cfdd8f9 1280
c6ba7c9b
HW		 1281static bool smcd_lgr_match(struct smc_link_group *lgr,
1282 struct smcd_dev *smcismdev, u64 peer_gid)
1283{
1284 return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
0cfdd8f9
UB		 1285}
1286
1287/* create a new SMC connection (and a new link group if necessary) */
bc36d2fc 1288int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
0cfdd8f9
UB		 1289{
1290 struct smc_connection *conn = &smc->conn;
a2351c5d 1291 struct list_head *lgr_list;
0cfdd8f9 1292 struct smc_link_group *lgr;
0cfdd8f9 1293 enum smc_lgr_role role;
a0a62ee1 1294 spinlock_t *lgr_lock;
0cfdd8f9
UB		 1295 int rc = 0;
1296
a2351c5d 1297 lgr_list = ini->is_smcd ? &ini->ism_dev->lgr_list : &smc_lgr_list.list;
a0a62ee1 1298 lgr_lock = ini->is_smcd ? &ini->ism_dev->lgr_lock : &smc_lgr_list.lock;
7a62725a 1299 ini->cln_first_contact = SMC_FIRST_CONTACT;
0cfdd8f9 1300 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
bc36d2fc 1301 if (role == SMC_CLNT && ini->srv_first_contact)
0cfdd8f9
UB		 1302 /* create new link group as well */
1303 goto create;
1304
1305 /* determine if an existing link group can be reused */
a0a62ee1 1306 spin_lock_bh(lgr_lock);
a2351c5d 1307 list_for_each_entry(lgr, lgr_list, list) {
0cfdd8f9 1308 write_lock_bh(&lgr->conns_lock);
bc36d2fc
KG		 1309 if ((ini->is_smcd ?
1310 smcd_lgr_match(lgr, ini->ism_dev, ini->ism_gid) :
1311 smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
0cfdd8f9 1312 !lgr->sync_err &&
bc36d2fc 1313 lgr->vlan_id == ini->vlan_id &&
a9e44502 1314 (role == SMC_CLNT || ini->is_smcd ||
c6ba7c9b 1315 lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
0cfdd8f9 1316 /* link group found */
7a62725a 1317 ini->cln_first_contact = SMC_REUSE_CONTACT;
0cfdd8f9 1318 conn->lgr = lgr;
56bc3b20 1319 rc = smc_lgr_register_conn(conn, false);
0cfdd8f9 1320 write_unlock_bh(&lgr->conns_lock);
b9247544
KG		 1321 if (!rc && delayed_work_pending(&lgr->free_work))
1322 cancel_delayed_work(&lgr->free_work);
0cfdd8f9
UB		 1323 break;
1324 }
1325 write_unlock_bh(&lgr->conns_lock);
1326 }
a0a62ee1 1327 spin_unlock_bh(lgr_lock);
b9247544
KG		 1328 if (rc)
1329 return rc;
0cfdd8f9 1330
bc36d2fc 1331 if (role == SMC_CLNT && !ini->srv_first_contact &&
7a62725a 1332 ini->cln_first_contact == SMC_FIRST_CONTACT) {
0cfdd8f9
UB		 1333 /* Server reuses a link group, but Client wants to start
1334 * a new one
1335 * send out_of_sync decline, reason synchr. error
1336 */
7a62725a 1337 return SMC_CLC_DECL_SYNCERR;
0cfdd8f9
UB		 1338 }
1339
1340create:
7a62725a 1341 if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
bc36d2fc 1342 rc = smc_lgr_create(smc, ini);
0cfdd8f9
UB		 1343 if (rc)
1344 goto out;
44808792
HZ		 1345 lgr = conn->lgr;
1346 write_lock_bh(&lgr->conns_lock);
56bc3b20 1347 rc = smc_lgr_register_conn(conn, true);
44808792 1348 write_unlock_bh(&lgr->conns_lock);
b9247544
KG		 1349 if (rc)
1350 goto out;
0cfdd8f9 1351 }
5f08318f 1352 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
cbba07a7 1353 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
de8474eb 1354 conn->urg_state = SMC_URG_READ;
b286a065 1355 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
bc36d2fc 1356 if (ini->is_smcd) {
be244f28
HW		 1357 conn->rx_off = sizeof(struct smcd_cdc_msg);
1358 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
2d2bfeb8
UB		 1359 } else {
1360 conn->rx_off = 0;
be244f28 1361 }
5f08318f
UB		 1362#ifndef KERNEL_HAS_ATOMIC64
1363 spin_lock_init(&conn->acurs_lock);
1364#endif
0cfdd8f9
UB		 1365
1366out:
7a62725a 1367 return rc;
0cfdd8f9 1368}
cd6851f3 1369
2f6becaf
HW		 1370/* convert the RMB size into the compressed notation - minimum 16K.
1371 * In contrast to plain ilog2, this rounds towards the next power of 2,
1372 * so the socket application gets at least its desired sndbuf / rcvbuf size.
1373 */
1374static u8 smc_compress_bufsize(int size)
1375{
1376 u8 compressed;
1377
1378 if (size <= SMC_BUF_MIN_SIZE)
1379 return 0;
1380
1381 size = (size - 1) >> 14;
1382 compressed = ilog2(size) + 1;
1383 if (compressed >= SMC_RMBE_SIZES)
1384 compressed = SMC_RMBE_SIZES - 1;
1385 return compressed;
1386}
1387
1388/* convert the RMB size from compressed notation into integer */
1389int smc_uncompress_bufsize(u8 compressed)
1390{
1391 u32 size;
1392
1393 size = 0x00000001 << (((int)compressed) + 14);
1394 return (int)size;
1395}
1396
3e034725
UB		 1397/* try to reuse a sndbuf or rmb description slot for a certain
1398 * buffer size; if not available, return NULL
cd6851f3 1399 */
8437bda0 1400static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
faca5360 1401 struct mutex *lock,
8437bda0 1402 struct list_head *buf_list)
cd6851f3 1403{
3e034725 1404 struct smc_buf_desc *buf_slot;
cd6851f3 1405
faca5360 1406 mutex_lock(lock);
3e034725
UB		 1407 list_for_each_entry(buf_slot, buf_list, list) {
1408 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
faca5360 1409 mutex_unlock(lock);
3e034725 1410 return buf_slot;
cd6851f3
UB		 1411 }
1412 }
faca5360 1413 mutex_unlock(lock);
cd6851f3
UB		 1414 return NULL;
1415}
1416
952310cc
UB		 1417/* one of the conditions for announcing a receiver's current window size is
1418 * that it "results in a minimum increase in the window size of 10% of the
1419 * receive buffer space" [RFC7609]
1420 */
1421static inline int smc_rmb_wnd_update_limit(int rmbe_size)
1422{
1423 return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
1424}
1425
b9247544
KG		 1426/* map an rmb buf to a link */
1427static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1428 struct smc_link *lnk)
1429{
1430 int rc;
1431
1432 if (buf_desc->is_map_ib[lnk->link_idx])
1433 return 0;
1434
1435 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
1436 if (rc)
1437 return rc;
1438 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
1439 buf_desc->cpu_addr, buf_desc->len);
1440
1441 /* map sg table to DMA address */
1442 rc = smc_ib_buf_map_sg(lnk, buf_desc,
1443 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1444 /* SMC protocol depends on mapping to one DMA address only */
1445 if (rc != 1) {
1446 rc = -EAGAIN;
1447 goto free_table;
1448 }
1449
1450 /* create a new memory region for the RMB */
1451 if (is_rmb) {
1452 rc = smc_ib_get_memory_region(lnk->roce_pd,
1453 IB_ACCESS_REMOTE_WRITE |
1454 IB_ACCESS_LOCAL_WRITE,
1455 buf_desc, lnk->link_idx);
1456 if (rc)
1457 goto buf_unmap;
1458 smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
1459 }
1460 buf_desc->is_map_ib[lnk->link_idx] = true;
1461 return 0;
1462
1463buf_unmap:
1464 smc_ib_buf_unmap_sg(lnk, buf_desc,
1465 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
1466free_table:
1467 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1468 return rc;
1469}
1470
d5500667
KG		 1471/* register a new rmb on IB device,
1472 * must be called under lgr->llc_conf_mutex lock
1473 */
7562a13d
KG		 1474int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
1475{
1476 if (list_empty(&link->lgr->list))
1477 return -ENOLINK;
1478 if (!rmb_desc->is_reg_mr[link->link_idx]) {
1479 /* register memory region for new rmb */
1480 if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
1481 rmb_desc->is_reg_err = true;
1482 return -EFAULT;
1483 }
1484 rmb_desc->is_reg_mr[link->link_idx] = true;
1485 }
1486 return 0;
1487}
1488
fb33d277
KG		 1489static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
1490 struct list_head *lst, bool is_rmb)
1491{
1492 struct smc_buf_desc *buf_desc, *bf;
1493 int rc = 0;
1494
1495 mutex_lock(lock);
1496 list_for_each_entry_safe(buf_desc, bf, lst, list) {
1497 if (!buf_desc->used)
1498 continue;
1499 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
1500 if (rc)
1501 goto out;
1502 }
1503out:
1504 mutex_unlock(lock);
1505 return rc;
1506}
1507
1508/* map all used buffers of lgr for a new link */
1509int smcr_buf_map_lgr(struct smc_link *lnk)
1510{
1511 struct smc_link_group *lgr = lnk->lgr;
1512 int i, rc = 0;
1513
1514 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1515 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
1516 &lgr->rmbs[i], true);
1517 if (rc)
1518 return rc;
1519 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
1520 &lgr->sndbufs[i], false);
1521 if (rc)
1522 return rc;
1523 }
1524 return 0;
1525}
1526
d5500667
KG		 1527/* register all used buffers of lgr for a new link,
1528 * must be called under lgr->llc_conf_mutex lock
1529 */
fb33d277
KG		 1530int smcr_buf_reg_lgr(struct smc_link *lnk)
1531{
1532 struct smc_link_group *lgr = lnk->lgr;
1533 struct smc_buf_desc *buf_desc, *bf;
1534 int i, rc = 0;
1535
1536 mutex_lock(&lgr->rmbs_lock);
1537 for (i = 0; i < SMC_RMBE_SIZES; i++) {
1538 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
1539 if (!buf_desc->used)
1540 continue;
1541 rc = smcr_link_reg_rmb(lnk, buf_desc);
1542 if (rc)
1543 goto out;
1544 }
1545 }
1546out:
1547 mutex_unlock(&lgr->rmbs_lock);
1548 return rc;
1549}
1550
c6ba7c9b
HW		 1551static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
1552 bool is_rmb, int bufsize)
b33982c3
UB		 1553{
1554 struct smc_buf_desc *buf_desc;
b33982c3
UB		 1555
1556 /* try to alloc a new buffer */
1557 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1558 if (!buf_desc)
1559 return ERR_PTR(-ENOMEM);
1560
2ef4f27a
SR		 1561 buf_desc->order = get_order(bufsize);
1562 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
1563 __GFP_NOMEMALLOC | __GFP_COMP |
1564 __GFP_NORETRY | __GFP_ZERO,
1565 buf_desc->order);
1566 if (!buf_desc->pages) {
b33982c3
UB		 1567 kfree(buf_desc);
1568 return ERR_PTR(-EAGAIN);
1569 }
2ef4f27a 1570 buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
b9247544
KG		 1571 buf_desc->len = bufsize;
1572 return buf_desc;
1573}
b33982c3 1574
b9247544
KG		 1575/* map buf_desc on all usable links,
1576 * unused buffers stay mapped as long as the link is up
1577 */
1578static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
1579 struct smc_buf_desc *buf_desc, bool is_rmb)
1580{
1581 int i, rc = 0;
b33982c3 1582
d5500667
KG		 1583 /* protect against parallel link reconfiguration */
1584 mutex_lock(&lgr->llc_conf_mutex);
b9247544
KG		 1585 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1586 struct smc_link *lnk = &lgr->lnk[i];
b33982c3 1587
d854fcbf 1588 if (!smc_link_usable(lnk))
b9247544
KG		 1589 continue;
1590 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
b9247544
KG		 1591 rc = -ENOMEM;
1592 goto out;
b33982c3
UB		 1593 }
1594 }
b9247544 1595out:
d5500667 1596 mutex_unlock(&lgr->llc_conf_mutex);
b9247544 1597 return rc;
b33982c3
UB		 1598}
1599
c6ba7c9b
HW		 1600#define SMCD_DMBE_SIZES 7 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
1601
1602static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
1603 bool is_dmb, int bufsize)
1604{
1605 struct smc_buf_desc *buf_desc;
1606 int rc;
1607
1608 if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
1609 return ERR_PTR(-EAGAIN);
1610
1611 /* try to alloc a new DMB */
1612 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
1613 if (!buf_desc)
1614 return ERR_PTR(-ENOMEM);
1615 if (is_dmb) {
1616 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
1617 if (rc) {
1618 kfree(buf_desc);
72b7f6c4 1619 return (rc == -ENOMEM) ? ERR_PTR(-EAGAIN) : ERR_PTR(rc);
c6ba7c9b 1620 }
be244f28
HW		 1621 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
1622 /* CDC header stored in buf. So, pretend it was smaller */
1623 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
c6ba7c9b
HW		 1624 } else {
1625 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
1626 __GFP_NOWARN | __GFP_NORETRY |
1627 __GFP_NOMEMALLOC);
1628 if (!buf_desc->cpu_addr) {
1629 kfree(buf_desc);
1630 return ERR_PTR(-EAGAIN);
1631 }
1632 buf_desc->len = bufsize;
1633 }
1634 return buf_desc;
1635}
1636
1637static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
cd6851f3 1638{
8437bda0 1639 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
cd6851f3
UB		 1640 struct smc_connection *conn = &smc->conn;
1641 struct smc_link_group *lgr = conn->lgr;
3e034725 1642 struct list_head *buf_list;
c45abf31 1643 int bufsize, bufsize_short;
faca5360 1644 struct mutex *lock; /* lock buffer list */
3e034725 1645 int sk_buf_size;
cd6851f3 1646
3e034725
UB		 1647 if (is_rmb)
1648 /* use socket recv buffer size (w/o overhead) as start value */
1649 sk_buf_size = smc->sk.sk_rcvbuf / 2;
1650 else
1651 /* use socket send buffer size (w/o overhead) as start value */
1652 sk_buf_size = smc->sk.sk_sndbuf / 2;
1653
4e1061f4 1654 for (bufsize_short = smc_compress_bufsize(sk_buf_size);
c45abf31 1655 bufsize_short >= 0; bufsize_short--) {
9d8fb617 1656
3e034725
UB		 1657 if (is_rmb) {
1658 lock = &lgr->rmbs_lock;
1659 buf_list = &lgr->rmbs[bufsize_short];
1660 } else {
1661 lock = &lgr->sndbufs_lock;
1662 buf_list = &lgr->sndbufs[bufsize_short];
9d8fb617 1663 }
c45abf31 1664 bufsize = smc_uncompress_bufsize(bufsize_short);
a3fe3d01
UB		 1665 if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
1666 continue;
1667
3e034725 1668 /* check for reusable slot in the link group */
8437bda0 1669 buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list);
3e034725
UB		 1670 if (buf_desc) {
1671 memset(buf_desc->cpu_addr, 0, bufsize);
cd6851f3
UB		 1672 break; /* found reusable slot */
1673 }
a3fe3d01 1674
c6ba7c9b
HW		 1675 if (is_smcd)
1676 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
1677 else
1678 buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
1679
b33982c3
UB		 1680 if (PTR_ERR(buf_desc) == -ENOMEM)
1681 break;
1682 if (IS_ERR(buf_desc))
a3fe3d01 1683 continue;
897e1c24 1684
3e034725 1685 buf_desc->used = 1;
faca5360 1686 mutex_lock(lock);
3e034725 1687 list_add(&buf_desc->list, buf_list);
faca5360 1688 mutex_unlock(lock);
3e034725 1689 break; /* found */
cd6851f3 1690 }
3e034725 1691
b33982c3 1692 if (IS_ERR(buf_desc))
72b7f6c4 1693 return PTR_ERR(buf_desc);
3e034725 1694
b9247544
KG		 1695 if (!is_smcd) {
1696 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
6d74c3a8 1697 smcr_buf_unuse(buf_desc, lgr);
b9247544
KG		 1698 return -ENOMEM;
1699 }
1700 }
1701
3e034725
UB		 1702 if (is_rmb) {
1703 conn->rmb_desc = buf_desc;
c45abf31
UB		 1704 conn->rmbe_size_short = bufsize_short;
1705 smc->sk.sk_rcvbuf = bufsize * 2;
5f08318f 1706 atomic_set(&conn->bytes_to_rcv, 0);
be244f28
HW		 1707 conn->rmbe_update_limit =
1708 smc_rmb_wnd_update_limit(buf_desc->len);
c6ba7c9b
HW		 1709 if (is_smcd)
1710 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
cd6851f3 1711 } else {
3e034725 1712 conn->sndbuf_desc = buf_desc;
3e034725
UB		 1713 smc->sk.sk_sndbuf = bufsize * 2;
1714 atomic_set(&conn->sndbuf_space, bufsize);
cd6851f3 1715 }
3e034725
UB		 1716 return 0;
1717}
1718
10428dd8
UB		 1719void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
1720{
741a49a4 1721 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
c6ba7c9b 1722 return;
387707fd 1723 smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
10428dd8
UB		 1724}
1725
1726void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
1727{
741a49a4 1728 if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
c6ba7c9b 1729 return;
387707fd 1730 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
10428dd8
UB		 1731}
1732
1733void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
1734{
b9247544 1735 int i;
10428dd8 1736
c6ba7c9b
HW		 1737 if (!conn->lgr || conn->lgr->is_smcd)
1738 return;
b9247544 1739 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 1740 if (!smc_link_active(&conn->lgr->lnk[i]))
b9247544
KG		 1741 continue;
1742 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
1743 DMA_FROM_DEVICE);
1744 }
10428dd8
UB		 1745}
1746
1747void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
1748{
b9247544 1749 int i;
10428dd8 1750
c6ba7c9b
HW		 1751 if (!conn->lgr || conn->lgr->is_smcd)
1752 return;
b9247544 1753 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 1754 if (!smc_link_active(&conn->lgr->lnk[i]))
b9247544
KG		 1755 continue;
1756 smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], conn->rmb_desc,
1757 DMA_FROM_DEVICE);
1758 }
10428dd8
UB		 1759}
1760
3e034725
UB		 1761/* create the send and receive buffer for an SMC socket;
1762 * receive buffers are called RMBs;
1763 * (even though the SMC protocol allows more than one RMB-element per RMB,
1764 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
1765 * extra RMB for every connection in a link group
1766 */
c6ba7c9b 1767int smc_buf_create(struct smc_sock *smc, bool is_smcd)
3e034725
UB		 1768{
1769 int rc;
1770
1771 /* create send buffer */
c6ba7c9b 1772 rc = __smc_buf_create(smc, is_smcd, false);
3e034725
UB		 1773 if (rc)
1774 return rc;
1775 /* create rmb */
c6ba7c9b 1776 rc = __smc_buf_create(smc, is_smcd, true);
fd7f3a74
KG		 1777 if (rc) {
1778 mutex_lock(&smc->conn.lgr->sndbufs_lock);
1779 list_del(&smc->conn.sndbuf_desc->list);
1780 mutex_unlock(&smc->conn.lgr->sndbufs_lock);
6511aad3 1781 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
1d8df41d 1782 smc->conn.sndbuf_desc = NULL;
fd7f3a74 1783 }
3e034725 1784 return rc;
cd6851f3 1785}
bd4ad577
UB		 1786
1787static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
1788{
1789 int i;
1790
1791 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
1792 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
1793 return i;
1794 }
1795 return -ENOSPC;
1796}
1797
ba21abd2
KG		 1798static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
1799 u32 rkey)
1800{
1801 int i;
1802
1803 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1804 if (test_bit(i, lgr->rtokens_used_mask) &&
1805 lgr->rtokens[i][lnk_idx].rkey == rkey)
1806 return i;
1807 }
1808 return -ENOENT;
1809}
1810
1811/* set rtoken for a new link to an existing rmb */
1812void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
1813 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
1814{
1815 int rtok_idx;
1816
1817 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
1818 if (rtok_idx == -ENOENT)
1819 return;
1820 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
1821 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
1822}
1823
1824/* set rtoken for a new link whose link_id is given */
1825void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
1826 __be64 nw_vaddr, __be32 nw_rkey)
1827{
1828 u64 dma_addr = be64_to_cpu(nw_vaddr);
1829 u32 rkey = ntohl(nw_rkey);
1830 bool found = false;
1831 int link_idx;
1832
1833 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
1834 if (lgr->lnk[link_idx].link_id == link_id) {
1835 found = true;
1836 break;
1837 }
1838 }
1839 if (!found)
1840 return;
1841 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
1842 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
1843}
1844
4ed75de5 1845/* add a new rtoken from peer */
387707fd 1846int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
bd4ad577 1847{
387707fd 1848 struct smc_link_group *lgr = smc_get_lgr(lnk);
4ed75de5
KG		 1849 u64 dma_addr = be64_to_cpu(nw_vaddr);
1850 u32 rkey = ntohl(nw_rkey);
bd4ad577
UB		 1851 int i;
1852
1853 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
387707fd
KG		 1854 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
1855 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
bd4ad577 1856 test_bit(i, lgr->rtokens_used_mask)) {
4ed75de5
KG		 1857 /* already in list */
1858 return i;
1859 }
1860 }
1861 i = smc_rmb_reserve_rtoken_idx(lgr);
1862 if (i < 0)
1863 return i;
387707fd
KG		 1864 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
1865 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
4ed75de5
KG		 1866 return i;
1867}
1868
e07d31dc 1869/* delete an rtoken from all links */
387707fd 1870int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
4ed75de5 1871{
387707fd 1872 struct smc_link_group *lgr = smc_get_lgr(lnk);
4ed75de5 1873 u32 rkey = ntohl(nw_rkey);
e07d31dc 1874 int i, j;
4ed75de5
KG		 1875
1876 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
387707fd 1877 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
4ed75de5 1878 test_bit(i, lgr->rtokens_used_mask)) {
e07d31dc
KG		 1879 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
1880 lgr->rtokens[i][j].rkey = 0;
1881 lgr->rtokens[i][j].dma_addr = 0;
1882 }
4ed75de5 1883 clear_bit(i, lgr->rtokens_used_mask);
bd4ad577
UB		 1884 return 0;
1885 }
1886 }
4ed75de5
KG		 1887 return -ENOENT;
1888}
1889
1890/* save rkey and dma_addr received from peer during clc handshake */
1891int smc_rmb_rtoken_handling(struct smc_connection *conn,
e07d31dc 1892 struct smc_link *lnk,
4ed75de5
KG		 1893 struct smc_clc_msg_accept_confirm *clc)
1894{
e07d31dc 1895 conn->rtoken_idx = smc_rtoken_add(lnk, clc->rmb_dma_addr,
4ed75de5 1896 clc->rmb_rkey);
bd4ad577
UB		 1897 if (conn->rtoken_idx < 0)
1898 return conn->rtoken_idx;
bd4ad577
UB		 1899 return 0;
1900}
9fda3510 1901
c3d9494e
UB		 1902static void smc_core_going_away(void)
1903{
1904 struct smc_ib_device *smcibdev;
1905 struct smcd_dev *smcd;
1906
92f3cb0e 1907 mutex_lock(&smc_ib_devices.mutex);
c3d9494e
UB		 1908 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
1909 int i;
1910
1911 for (i = 0; i < SMC_MAX_PORTS; i++)
1912 set_bit(i, smcibdev->ports_going_away);
1913 }
92f3cb0e 1914 mutex_unlock(&smc_ib_devices.mutex);
c3d9494e 1915
82087c03 1916 mutex_lock(&smcd_dev_list.mutex);
c3d9494e
UB		 1917 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
1918 smcd->going_away = 1;
1919 }
82087c03 1920 mutex_unlock(&smcd_dev_list.mutex);
c3d9494e
UB		 1921}
1922
5421ec28
UB		 1923/* Clean up all SMC link groups */
1924static void smc_lgrs_shutdown(void)
9fda3510 1925{
a2351c5d 1926 struct smcd_dev *smcd;
9fda3510 1927
c3d9494e
UB		 1928 smc_core_going_away();
1929
0b29ec64 1930 smc_smcr_terminate_all(NULL);
a2351c5d 1931
82087c03 1932 mutex_lock(&smcd_dev_list.mutex);
a2351c5d 1933 list_for_each_entry(smcd, &smcd_dev_list.list, list)
5421ec28 1934 smc_smcd_terminate_all(smcd);
82087c03 1935 mutex_unlock(&smcd_dev_list.mutex);
9fda3510 1936}
5421ec28 1937
a33a803c
UB		 1938static int smc_core_reboot_event(struct notifier_block *this,
1939 unsigned long event, void *ptr)
1940{
1941 smc_lgrs_shutdown();
28a3b840 1942 smc_ib_unregister_client();
a33a803c
UB		 1943 return 0;
1944}
1945
1946static struct notifier_block smc_reboot_notifier = {
1947 .notifier_call = smc_core_reboot_event,
1948};
1949
6dabd405
UB		 1950int __init smc_core_init(void)
1951{
a33a803c 1952 return register_reboot_notifier(&smc_reboot_notifier);
6dabd405
UB		 1953}
1954
5421ec28
UB		 1955/* Called (from smc_exit) when module is removed */
1956void smc_core_exit(void)
1957{
a33a803c 1958 unregister_reboot_notifier(&smc_reboot_notifier);
5421ec28
UB		 1959 smc_lgrs_shutdown();
1960}
Linux 6.x block layer and io_uring tree(s)