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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux-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>
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"
e0e4b8fa 36#include "smc_stats.h"
a3a0e81b 37#include "smc_tracepoint.h"
0cfdd8f9 38
5bc11ddb
UB		 39#define SMC_LGR_NUM_INCR 256
40#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
7f58a1ad 41#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
0cfdd8f9 42
a3db10ef 43struct smc_lgr_list smc_lgr_list = { /* established link groups */
9fda3510
HW		 44 .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
45 .list = LIST_HEAD_INIT(smc_lgr_list.list),
46 .num = 0,
47};
9bf9abea 48
29115cef 49static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
6dabd405
UB		 50static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
51
6511aad3
HW		 52static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
53 struct smc_buf_desc *buf_desc);
5f78fe96 54static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
a6920d1d 55
541afa10 56static void smc_link_down_work(struct work_struct *work);
1f90a05d 57
a0a62ee1
UB		 58/* return head of link group list and its lock for a given link group */
59static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
60 spinlock_t **lgr_lock)
61{
62 if (lgr->is_smcd) {
63 *lgr_lock = &lgr->smcd->lgr_lock;
64 return &lgr->smcd->lgr_list;
65 }
66
67 *lgr_lock = &smc_lgr_list.lock;
68 return &smc_lgr_list.list;
69}
70
ddc99286
GG		 71static void smc_ibdev_cnt_inc(struct smc_link *lnk)
72{
73 atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
74}
75
76static void smc_ibdev_cnt_dec(struct smc_link *lnk)
77{
78 atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
79}
80
97cdbc42
KG		 81static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
82{
83 /* client link group creation always follows the server link group
84 * creation. For client use a somewhat higher removal delay time,
85 * otherwise there is a risk of out-of-sync link groups.
86 */
f9aab6f2 87 if (!lgr->freeing) {
8e316b9e
UB		 88 mod_delayed_work(system_wq, &lgr->free_work,
89 (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
90 SMC_LGR_FREE_DELAY_CLNT :
91 SMC_LGR_FREE_DELAY_SERV);
92 }
97cdbc42
KG		 93}
94
0cfdd8f9
UB		 95/* Register connection's alert token in our lookup structure.
96 * To use rbtrees we have to implement our own insert core.
97 * Requires @conns_lock
98 * @smc connection to register
99 * Returns 0 on success, != otherwise.
100 */
101static void smc_lgr_add_alert_token(struct smc_connection *conn)
102{
103 struct rb_node **link, *parent = NULL;
104 u32 token = conn->alert_token_local;
105
106 link = &conn->lgr->conns_all.rb_node;
107 while (*link) {
108 struct smc_connection *cur = rb_entry(*link,
109 struct smc_connection, alert_node);
110
111 parent = *link;
112 if (cur->alert_token_local > token)
113 link = &parent->rb_left;
114 else
115 link = &parent->rb_right;
116 }
117 /* Put the new node there */
118 rb_link_node(&conn->alert_node, parent, link);
119 rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
120}
121
56bc3b20
KG		 122/* assign an SMC-R link to the connection */
123static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
124{
125 enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
126 SMC_LNK_ACTIVE;
127 int i, j;
128
129 /* do link balancing */
35112271 130 conn->lnk = NULL; /* reset conn->lnk first */
56bc3b20
KG		 131 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
132 struct smc_link *lnk = &conn->lgr->lnk[i];
133
ad6c111b 134 if (lnk->state != expected || lnk->link_is_asym)
56bc3b20
KG		 135 continue;
136 if (conn->lgr->role == SMC_CLNT) {
137 conn->lnk = lnk; /* temporary, SMC server assigns link*/
138 break;
139 }
140 if (conn->lgr->conns_num % 2) {
141 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
142 struct smc_link *lnk2;
143
144 lnk2 = &conn->lgr->lnk[j];
ad6c111b
KG		 145 if (lnk2->state == expected &&
146 !lnk2->link_is_asym) {
56bc3b20
KG		 147 conn->lnk = lnk2;
148 break;
149 }
150 }
151 }
152 if (!conn->lnk)
153 conn->lnk = lnk;
154 break;
155 }
156 if (!conn->lnk)
157 return SMC_CLC_DECL_NOACTLINK;
07d51580 158 atomic_inc(&conn->lnk->conn_cnt);
56bc3b20
KG		 159 return 0;
160}
161
0cfdd8f9
UB		 162/* Register connection in link group by assigning an alert token
163 * registered in a search tree.
164 * Requires @conns_lock
165 * Note that '0' is a reserved value and not assigned.
166 */
56bc3b20 167static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
0cfdd8f9
UB		 168{
169 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
170 static atomic_t nexttoken = ATOMIC_INIT(0);
56bc3b20 171 int rc;
0cfdd8f9 172
56bc3b20
KG		 173 if (!conn->lgr->is_smcd) {
174 rc = smcr_lgr_conn_assign_link(conn, first);
36595d8a
WG		 175 if (rc) {
176 conn->lgr = NULL;
56bc3b20 177 return rc;
36595d8a 178 }
56bc3b20 179 }
0cfdd8f9
UB		 180 /* find a new alert_token_local value not yet used by some connection
181 * in this link group
182 */
183 sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
184 while (!conn->alert_token_local) {
185 conn->alert_token_local = atomic_inc_return(&nexttoken);
186 if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
187 conn->alert_token_local = 0;
188 }
189 smc_lgr_add_alert_token(conn);
190 conn->lgr->conns_num++;
b9247544 191 return 0;
0cfdd8f9
UB		 192}
193
194/* Unregister connection and reset the alert token of the given connection<
195 */
196static void __smc_lgr_unregister_conn(struct smc_connection *conn)
197{
198 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
199 struct smc_link_group *lgr = conn->lgr;
200
201 rb_erase(&conn->alert_node, &lgr->conns_all);
07d51580
GG		 202 if (conn->lnk)
203 atomic_dec(&conn->lnk->conn_cnt);
0cfdd8f9
UB		 204 lgr->conns_num--;
205 conn->alert_token_local = 0;
0cfdd8f9
UB		 206 sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
207}
208
fb692ec4 209/* Unregister connection from lgr
0cfdd8f9
UB		 210 */
211static void smc_lgr_unregister_conn(struct smc_connection *conn)
212{
213 struct smc_link_group *lgr = conn->lgr;
0cfdd8f9 214
ea89c6c0 215 if (!smc_conn_lgr_valid(conn))
77f838ac 216 return;
0cfdd8f9
UB		 217 write_lock_bh(&lgr->conns_lock);
218 if (conn->alert_token_local) {
0cfdd8f9
UB		 219 __smc_lgr_unregister_conn(conn);
220 }
221 write_unlock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 222}
223
d386d59b
WG		 224static void smc_lgr_buf_list_add(struct smc_link_group *lgr,
225 bool is_rmb,
226 struct list_head *buf_list,
227 struct smc_buf_desc *buf_desc)
228{
229 list_add(&buf_desc->list, buf_list);
230 if (is_rmb) {
231 lgr->alloc_rmbs += buf_desc->len;
232 lgr->alloc_rmbs +=
233 lgr->is_smcd ? sizeof(struct smcd_cdc_msg) : 0;
234 } else {
235 lgr->alloc_sndbufs += buf_desc->len;
236 }
237}
238
239static void smc_lgr_buf_list_del(struct smc_link_group *lgr,
240 bool is_rmb,
241 struct smc_buf_desc *buf_desc)
242{
243 list_del(&buf_desc->list);
244 if (is_rmb) {
245 lgr->alloc_rmbs -= buf_desc->len;
246 lgr->alloc_rmbs -=
247 lgr->is_smcd ? sizeof(struct smcd_cdc_msg) : 0;
248 } else {
249 lgr->alloc_sndbufs -= buf_desc->len;
250 }
251}
252
099b990b
GG		 253int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
254{
255 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
256 char hostname[SMC_MAX_HOSTNAME_LEN + 1];
257 char smc_seid[SMC_MAX_EID_LEN + 1];
099b990b
GG		 258 struct nlattr *attrs;
259 u8 *seid = NULL;
260 u8 *host = NULL;
261 void *nlh;
262
263 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
264 &smc_gen_nl_family, NLM_F_MULTI,
265 SMC_NETLINK_GET_SYS_INFO);
266 if (!nlh)
267 goto errmsg;
268 if (cb_ctx->pos[0])
269 goto errout;
270 attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
271 if (!attrs)
272 goto errout;
273 if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
274 goto errattr;
275 if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
276 goto errattr;
277 if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
278 goto errattr;
b0539f5e
KG		 279 if (nla_put_u8(skb, SMC_NLA_SYS_IS_SMCR_V2, true))
280 goto errattr;
099b990b
GG		 281 smc_clc_get_hostname(&host);
282 if (host) {
25fe2c9c
JK		 283 memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
284 hostname[SMC_MAX_HOSTNAME_LEN] = 0;
099b990b
GG		 285 if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
286 goto errattr;
287 }
11a26c59
KG		 288 if (smc_ism_is_v2_capable()) {
289 smc_ism_get_system_eid(&seid);
8a446536
GG		 290 memcpy(smc_seid, seid, SMC_MAX_EID_LEN);
291 smc_seid[SMC_MAX_EID_LEN] = 0;
099b990b
GG		 292 if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
293 goto errattr;
294 }
295 nla_nest_end(skb, attrs);
296 genlmsg_end(skb, nlh);
297 cb_ctx->pos[0] = 1;
298 return skb->len;
299
300errattr:
301 nla_nest_cancel(skb, attrs);
302errout:
303 genlmsg_cancel(skb, nlh);
304errmsg:
305 return skb->len;
306}
307
b0539f5e
KG		 308/* Fill SMC_NLA_LGR_D_V2_COMMON/SMC_NLA_LGR_R_V2_COMMON nested attributes */
309static int smc_nl_fill_lgr_v2_common(struct smc_link_group *lgr,
310 struct sk_buff *skb,
311 struct netlink_callback *cb,
312 struct nlattr *v2_attrs)
313{
314 char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
315 char smc_eid[SMC_MAX_EID_LEN + 1];
316
317 if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
318 goto errv2attr;
319 if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
320 goto errv2attr;
321 if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
322 goto errv2attr;
323 memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN);
324 smc_host[SMC_MAX_HOSTNAME_LEN] = 0;
325 if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
326 goto errv2attr;
327 memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN);
328 smc_eid[SMC_MAX_EID_LEN] = 0;
329 if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
330 goto errv2attr;
331
332 nla_nest_end(skb, v2_attrs);
333 return 0;
334
335errv2attr:
336 nla_nest_cancel(skb, v2_attrs);
337 return -EMSGSIZE;
338}
339
340static int smc_nl_fill_smcr_lgr_v2(struct smc_link_group *lgr,
341 struct sk_buff *skb,
342 struct netlink_callback *cb)
343{
344 struct nlattr *v2_attrs;
345
346 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2);
347 if (!v2_attrs)
348 goto errattr;
349 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_DIRECT, !lgr->uses_gateway))
350 goto errv2attr;
bbed596c
GW		 351 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_MAX_CONNS, lgr->max_conns))
352 goto errv2attr;
353 if (nla_put_u8(skb, SMC_NLA_LGR_R_V2_MAX_LINKS, lgr->max_links))
354 goto errv2attr;
b0539f5e
KG		 355
356 nla_nest_end(skb, v2_attrs);
357 return 0;
358
359errv2attr:
360 nla_nest_cancel(skb, v2_attrs);
361errattr:
362 return -EMSGSIZE;
363}
364
e9b8c845
GG		 365static int smc_nl_fill_lgr(struct smc_link_group *lgr,
366 struct sk_buff *skb,
367 struct netlink_callback *cb)
368{
369 char smc_target[SMC_MAX_PNETID_LEN + 1];
b0539f5e 370 struct nlattr *attrs, *v2_attrs;
e9b8c845
GG		 371
372 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
373 if (!attrs)
374 goto errout;
375
376 if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
377 goto errattr;
378 if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
379 goto errattr;
380 if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
381 goto errattr;
382 if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
383 goto errattr;
ddefb2d2
WG		 384 if (nla_put_u8(skb, SMC_NLA_LGR_R_BUF_TYPE, lgr->buf_type))
385 goto errattr;
e9b8c845
GG		 386 if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
387 goto errattr;
79d39fc5
TL		 388 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_R_NET_COOKIE,
389 lgr->net->net_cookie, SMC_NLA_LGR_R_PAD))
390 goto errattr;
8a446536
GG		 391 memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
392 smc_target[SMC_MAX_PNETID_LEN] = 0;
e9b8c845
GG		 393 if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
394 goto errattr;
d386d59b
WG		 395 if (nla_put_uint(skb, SMC_NLA_LGR_R_SNDBUF_ALLOC, lgr->alloc_sndbufs))
396 goto errattr;
397 if (nla_put_uint(skb, SMC_NLA_LGR_R_RMB_ALLOC, lgr->alloc_rmbs))
398 goto errattr;
b0539f5e
KG		 399 if (lgr->smc_version > SMC_V1) {
400 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_R_V2_COMMON);
401 if (!v2_attrs)
402 goto errattr;
403 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs))
404 goto errattr;
405 if (smc_nl_fill_smcr_lgr_v2(lgr, skb, cb))
406 goto errattr;
407 }
e9b8c845
GG		 408
409 nla_nest_end(skb, attrs);
410 return 0;
411errattr:
412 nla_nest_cancel(skb, attrs);
413errout:
414 return -EMSGSIZE;
415}
416
5a7e09d5
GG		 417static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
418 struct smc_link *link,
419 struct sk_buff *skb,
420 struct netlink_callback *cb)
421{
8a446536 422 char smc_ibname[IB_DEVICE_NAME_MAX];
5a7e09d5
GG		 423 u8 smc_gid_target[41];
424 struct nlattr *attrs;
425 u32 link_uid = 0;
426 void *nlh;
427
428 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
429 &smc_gen_nl_family, NLM_F_MULTI,
430 SMC_NETLINK_GET_LINK_SMCR);
431 if (!nlh)
432 goto errmsg;
433
434 attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
435 if (!attrs)
436 goto errout;
437
438 if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
439 goto errattr;
440 if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
441 goto errattr;
442 if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
443 atomic_read(&link->conn_cnt)))
444 goto errattr;
445 if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
446 goto errattr;
447 if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
448 goto errattr;
449 snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
450 if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
451 goto errattr;
452 memcpy(&link_uid, link->link_uid, sizeof(link_uid));
453 if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
454 goto errattr;
455 memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
456 if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
457 goto errattr;
458 memset(smc_gid_target, 0, sizeof(smc_gid_target));
459 smc_gid_be16_convert(smc_gid_target, link->gid);
460 if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
461 goto errattr;
462 memset(smc_gid_target, 0, sizeof(smc_gid_target));
463 smc_gid_be16_convert(smc_gid_target, link->peer_gid);
464 if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
465 goto errattr;
466
467 nla_nest_end(skb, attrs);
468 genlmsg_end(skb, nlh);
469 return 0;
470errattr:
471 nla_nest_cancel(skb, attrs);
472errout:
473 genlmsg_cancel(skb, nlh);
474errmsg:
475 return -EMSGSIZE;
476}
477
e9b8c845
GG		 478static int smc_nl_handle_lgr(struct smc_link_group *lgr,
479 struct sk_buff *skb,
5a7e09d5
GG		 480 struct netlink_callback *cb,
481 bool list_links)
e9b8c845
GG		 482{
483 void *nlh;
5a7e09d5 484 int i;
e9b8c845
GG		 485
486 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
487 &smc_gen_nl_family, NLM_F_MULTI,
488 SMC_NETLINK_GET_LGR_SMCR);
489 if (!nlh)
490 goto errmsg;
491 if (smc_nl_fill_lgr(lgr, skb, cb))
492 goto errout;
493
494 genlmsg_end(skb, nlh);
5a7e09d5
GG		 495 if (!list_links)
496 goto out;
497 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
498 if (!smc_link_usable(&lgr->lnk[i]))
499 continue;
500 if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
501 goto errout;
502 }
503out:
e9b8c845
GG		 504 return 0;
505
506errout:
507 genlmsg_cancel(skb, nlh);
508errmsg:
509 return -EMSGSIZE;
510}
511
512static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
513 struct sk_buff *skb,
5a7e09d5
GG		 514 struct netlink_callback *cb,
515 bool list_links)
e9b8c845
GG		 516{
517 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
518 struct smc_link_group *lgr;
519 int snum = cb_ctx->pos[0];
520 int num = 0;
521
522 spin_lock_bh(&smc_lgr->lock);
523 list_for_each_entry(lgr, &smc_lgr->list, list) {
524 if (num < snum)
525 goto next;
5a7e09d5 526 if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
e9b8c845
GG		 527 goto errout;
528next:
529 num++;
530 }
531errout:
532 spin_unlock_bh(&smc_lgr->lock);
533 cb_ctx->pos[0] = num;
534}
535
8f9dde4b
GG		 536static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
537 struct sk_buff *skb,
538 struct netlink_callback *cb)
539{
8f9dde4b 540 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
9de4df7b 541 struct smcd_dev *smcd = lgr->smcd;
b40584d1 542 struct smcd_gid smcd_gid;
8f9dde4b
GG		 543 struct nlattr *attrs;
544 void *nlh;
545
546 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
547 &smc_gen_nl_family, NLM_F_MULTI,
548 SMC_NETLINK_GET_LGR_SMCD);
549 if (!nlh)
550 goto errmsg;
551
552 attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
553 if (!attrs)
554 goto errout;
555
556 if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
557 goto errattr;
b40584d1 558 smcd->ops->get_local_gid(smcd, &smcd_gid);
9de4df7b 559 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID,
b40584d1 560 smcd_gid.gid, SMC_NLA_LGR_D_PAD))
8f9dde4b 561 goto errattr;
01fd1617
WG		 562 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_EXT_GID,
563 smcd_gid.gid_ext, SMC_NLA_LGR_D_PAD))
564 goto errattr;
b40584d1 565 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid.gid,
8f9dde4b
GG		 566 SMC_NLA_LGR_D_PAD))
567 goto errattr;
01fd1617
WG		 568 if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_EXT_GID,
569 lgr->peer_gid.gid_ext, SMC_NLA_LGR_D_PAD))
570 goto errattr;
8f9dde4b
GG		 571 if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
572 goto errattr;
573 if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
574 goto errattr;
575 if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
576 goto errattr;
d386d59b
WG		 577 if (nla_put_uint(skb, SMC_NLA_LGR_D_SNDBUF_ALLOC, lgr->alloc_sndbufs))
578 goto errattr;
579 if (nla_put_uint(skb, SMC_NLA_LGR_D_DMB_ALLOC, lgr->alloc_rmbs))
580 goto errattr;
8a446536
GG		 581 memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
582 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
8f9dde4b
GG		 583 if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
584 goto errattr;
b0539f5e
KG		 585 if (lgr->smc_version > SMC_V1) {
586 struct nlattr *v2_attrs;
8f9dde4b 587
b0539f5e
KG		 588 v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_D_V2_COMMON);
589 if (!v2_attrs)
590 goto errattr;
591 if (smc_nl_fill_lgr_v2_common(lgr, skb, cb, v2_attrs))
592 goto errattr;
593 }
8f9dde4b
GG		 594 nla_nest_end(skb, attrs);
595 genlmsg_end(skb, nlh);
596 return 0;
597
8f9dde4b
GG		 598errattr:
599 nla_nest_cancel(skb, attrs);
600errout:
601 genlmsg_cancel(skb, nlh);
602errmsg:
603 return -EMSGSIZE;
604}
605
606static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
607 struct sk_buff *skb,
608 struct netlink_callback *cb)
609{
610 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
611 struct smc_link_group *lgr;
612 int snum = cb_ctx->pos[1];
613 int rc = 0, num = 0;
614
615 spin_lock_bh(&dev->lgr_lock);
616 list_for_each_entry(lgr, &dev->lgr_list, list) {
617 if (!lgr->is_smcd)
618 continue;
619 if (num < snum)
620 goto next;
621 rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
622 if (rc)
623 goto errout;
624next:
625 num++;
626 }
627errout:
628 spin_unlock_bh(&dev->lgr_lock);
629 cb_ctx->pos[1] = num;
630 return rc;
631}
632
633static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
634 struct sk_buff *skb,
635 struct netlink_callback *cb)
636{
637 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
638 struct smcd_dev *smcd_dev;
639 int snum = cb_ctx->pos[0];
640 int rc = 0, num = 0;
641
642 mutex_lock(&dev_list->mutex);
643 list_for_each_entry(smcd_dev, &dev_list->list, list) {
644 if (list_empty(&smcd_dev->lgr_list))
645 continue;
646 if (num < snum)
647 goto next;
648 rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
649 if (rc)
650 goto errout;
651next:
652 num++;
653 }
654errout:
655 mutex_unlock(&dev_list->mutex);
656 cb_ctx->pos[0] = num;
657 return rc;
658}
659
e9b8c845
GG		 660int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
661{
5a7e09d5
GG		 662 bool list_links = false;
663
664 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
665 return skb->len;
666}
667
668int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
669{
670 bool list_links = true;
671
672 smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
e9b8c845
GG		 673 return skb->len;
674}
675
8f9dde4b
GG		 676int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
677{
678 smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
679 return skb->len;
680}
681
36595d8a 682void smc_lgr_cleanup_early(struct smc_link_group *lgr)
51e3dfa8 683{
9ec6bf19 684 spinlock_t *lgr_lock;
51e3dfa8
UB		 685
686 if (!lgr)
687 return;
688
789b6cc2 689 smc_lgr_list_head(lgr, &lgr_lock);
9ec6bf19
KG		 690 spin_lock_bh(lgr_lock);
691 /* do not use this link group for new connections */
789b6cc2
DL		 692 if (!list_empty(&lgr->list))
693 list_del_init(&lgr->list);
9ec6bf19 694 spin_unlock_bh(lgr_lock);
f9aab6f2 695 __smc_lgr_terminate(lgr, true);
51e3dfa8
UB		 696}
697
a52bcc91
KG		 698static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
699{
700 int i;
701
702 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
703 struct smc_link *lnk = &lgr->lnk[i];
704
90cee52f 705 if (smc_link_sendable(lnk))
a52bcc91
KG		 706 lnk->state = SMC_LNK_INACTIVE;
707 }
6778a6be
KG		 708 wake_up_all(&lgr->llc_msg_waiter);
709 wake_up_all(&lgr->llc_flow_waiter);
a52bcc91
KG		 710}
711
3f3f0e36
UB		 712static void smc_lgr_free(struct smc_link_group *lgr);
713
0cfdd8f9
UB		 714static void smc_lgr_free_work(struct work_struct *work)
715{
716 struct smc_link_group *lgr = container_of(to_delayed_work(work),
717 struct smc_link_group,
718 free_work);
a0a62ee1 719 spinlock_t *lgr_lock;
0cfdd8f9
UB		 720 bool conns;
721
a0a62ee1
UB		 722 smc_lgr_list_head(lgr, &lgr_lock);
723 spin_lock_bh(lgr_lock);
8e316b9e
UB		 724 if (lgr->freeing) {
725 spin_unlock_bh(lgr_lock);
726 return;
727 }
0cfdd8f9
UB		 728 read_lock_bh(&lgr->conns_lock);
729 conns = RB_EMPTY_ROOT(&lgr->conns_all);
730 read_unlock_bh(&lgr->conns_lock);
731 if (!conns) { /* number of lgr connections is no longer zero */
a0a62ee1 732 spin_unlock_bh(lgr_lock);
0cfdd8f9
UB		 733 return;
734 }
8caa6544 735 list_del_init(&lgr->list); /* remove from smc_lgr_list */
8e316b9e
UB		 736 lgr->freeing = 1; /* this instance does the freeing, no new schedule */
737 spin_unlock_bh(lgr_lock);
738 cancel_delayed_work(&lgr->free_work);
0d18a0cb 739
f3811fd7
KG		 740 if (!lgr->is_smcd && !lgr->terminating)
741 smc_llc_send_link_delete_all(lgr, true,
742 SMC_LLC_DEL_PROG_INIT_TERM);
42bfba9e 743 if (lgr->is_smcd && !lgr->terminating)
8e316b9e 744 smc_ism_signal_shutdown(lgr);
a52bcc91
KG		 745 if (!lgr->is_smcd)
746 smcr_lgr_link_deactivate_all(lgr);
8e316b9e 747 smc_lgr_free(lgr);
0cfdd8f9
UB		 748}
749
f528ba24
UB		 750static void smc_lgr_terminate_work(struct work_struct *work)
751{
752 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
753 terminate_work);
754
5f78fe96 755 __smc_lgr_terminate(lgr, true);
f528ba24
UB		 756}
757
026c381f
KG		 758/* return next unique link id for the lgr */
759static u8 smcr_next_link_id(struct smc_link_group *lgr)
760{
761 u8 link_id;
762 int i;
763
764 while (1) {
cf4f5530 765again:
026c381f
KG		 766 link_id = ++lgr->next_link_id;
767 if (!link_id) /* skip zero as link_id */
768 link_id = ++lgr->next_link_id;
769 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
d854fcbf 770 if (smc_link_usable(&lgr->lnk[i]) &&
026c381f 771 lgr->lnk[i].link_id == link_id)
cf4f5530 772 goto again;
026c381f
KG		 773 }
774 break;
775 }
776 return link_id;
777}
778
6443b2f6
GG		 779static void smcr_copy_dev_info_to_link(struct smc_link *link)
780{
781 struct smc_ib_device *smcibdev = link->smcibdev;
782
783 snprintf(link->ibname, sizeof(link->ibname), "%s",
784 smcibdev->ibdev->name);
785 link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
786}
787
336ba09f
KG		 788int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
789 u8 link_idx, struct smc_init_info *ini)
f3c1dedd 790{
e49300a6 791 struct smc_ib_device *smcibdev;
f3c1dedd
KG		 792 u8 rndvec[3];
793 int rc;
794
e49300a6
KG		 795 if (lgr->smc_version == SMC_V2) {
796 lnk->smcibdev = ini->smcrv2.ib_dev_v2;
797 lnk->ibport = ini->smcrv2.ib_port_v2;
798 } else {
799 lnk->smcibdev = ini->ib_dev;
800 lnk->ibport = ini->ib_port;
801 }
802 get_device(&lnk->smcibdev->ibdev->dev);
803 atomic_inc(&lnk->smcibdev->lnk_cnt);
20c9398d
WG		 804 refcount_set(&lnk->refcnt, 1); /* link refcnt is set to 1 */
805 lnk->clearing = 0;
e49300a6 806 lnk->path_mtu = lnk->smcibdev->pattr[lnk->ibport - 1].active_mtu;
026c381f 807 lnk->link_id = smcr_next_link_id(lgr);
387707fd 808 lnk->lgr = lgr;
61f434b0 809 smc_lgr_hold(lgr); /* lgr_put in smcr_link_clear() */
026c381f 810 lnk->link_idx = link_idx;
e9b1a4f8 811 lnk->wr_rx_id_compl = 0;
ddc99286 812 smc_ibdev_cnt_inc(lnk);
6443b2f6 813 smcr_copy_dev_info_to_link(lnk);
07d51580 814 atomic_set(&lnk->conn_cnt, 0);
45fa8da0 815 smc_llc_link_set_uid(lnk);
541afa10 816 INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
e49300a6
KG		 817 if (!lnk->smcibdev->initialized) {
818 rc = (int)smc_ib_setup_per_ibdev(lnk->smcibdev);
f3c1dedd
KG		 819 if (rc)
820 goto out;
821 }
822 get_random_bytes(rndvec, sizeof(rndvec));
823 lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
824 (rndvec[2] << 16);
825 rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
24fb6811
KG		 826 ini->vlan_id, lnk->gid, &lnk->sgid_index,
827 lgr->smc_version == SMC_V2 ?
828 &ini->smcrv2 : NULL);
f3c1dedd
KG		 829 if (rc)
830 goto out;
831 rc = smc_llc_link_init(lnk);
832 if (rc)
833 goto out;
834 rc = smc_wr_alloc_link_mem(lnk);
835 if (rc)
836 goto clear_llc_lnk;
837 rc = smc_ib_create_protection_domain(lnk);
838 if (rc)
839 goto free_link_mem;
840 rc = smc_ib_create_queue_pair(lnk);
841 if (rc)
842 goto dealloc_pd;
843 rc = smc_wr_create_link(lnk);
844 if (rc)
845 goto destroy_qp;
741a49a4 846 lnk->state = SMC_LNK_ACTIVATING;
f3c1dedd
KG		 847 return 0;
848
849destroy_qp:
850 smc_ib_destroy_queue_pair(lnk);
851dealloc_pd:
852 smc_ib_dealloc_protection_domain(lnk);
853free_link_mem:
854 smc_wr_free_link_mem(lnk);
855clear_llc_lnk:
0a99be43 856 smc_llc_link_clear(lnk, false);
f3c1dedd 857out:
ddc99286 858 smc_ibdev_cnt_dec(lnk);
e49300a6
KG		 859 put_device(&lnk->smcibdev->ibdev->dev);
860 smcibdev = lnk->smcibdev;
f3c1dedd 861 memset(lnk, 0, sizeof(struct smc_link));
d854fcbf 862 lnk->state = SMC_LNK_UNUSED;
e49300a6
KG		 863 if (!atomic_dec_return(&smcibdev->lnk_cnt))
864 wake_up(&smcibdev->lnks_deleted);
61f434b0 865 smc_lgr_put(lgr); /* lgr_hold above */
f3c1dedd
KG		 866 return rc;
867}
868
0cfdd8f9 869/* create a new SMC link group */
bc36d2fc 870static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
0cfdd8f9
UB		 871{
872 struct smc_link_group *lgr;
a2351c5d 873 struct list_head *lgr_list;
8c81ba20 874 struct smcd_dev *smcd;
0cfdd8f9 875 struct smc_link *lnk;
a0a62ee1 876 spinlock_t *lgr_lock;
026c381f 877 u8 link_idx;
0cfdd8f9 878 int rc = 0;
cd6851f3 879 int i;
0cfdd8f9 880
bc36d2fc 881 if (ini->is_smcd && ini->vlan_id) {
5c21c4cc
UB		 882 if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
883 ini->vlan_id)) {
7a62725a 884 rc = SMC_CLC_DECL_ISMVLANERR;
c6ba7c9b 885 goto out;
7a62725a 886 }
c6ba7c9b
HW		 887 }
888
0cfdd8f9
UB		 889 lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
890 if (!lgr) {
7a62725a 891 rc = SMC_CLC_DECL_MEM;
29ee2701 892 goto ism_put_vlan;
0cfdd8f9 893 }
22ef473d
KG		 894 lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
895 SMC_LGR_ID_SIZE, &lgr->id);
896 if (!lgr->tx_wq) {
897 rc = -ENOMEM;
898 goto free_lgr;
899 }
bc36d2fc 900 lgr->is_smcd = ini->is_smcd;
517c300e 901 lgr->sync_err = 0;
8e316b9e 902 lgr->terminating = 0;
8e316b9e 903 lgr->freeing = 0;
bc36d2fc 904 lgr->vlan_id = ini->vlan_id;
61f434b0 905 refcount_set(&lgr->refcnt, 1); /* set lgr refcnt to 1 */
aff7bfed
W		 906 init_rwsem(&lgr->sndbufs_lock);
907 init_rwsem(&lgr->rmbs_lock);
c6ba7c9b 908 rwlock_init(&lgr->conns_lock);
cd6851f3
UB		 909 for (i = 0; i < SMC_RMBE_SIZES; i++) {
910 INIT_LIST_HEAD(&lgr->sndbufs[i]);
911 INIT_LIST_HEAD(&lgr->rmbs[i]);
912 }
026c381f 913 lgr->next_link_id = 0;
9fda3510
HW		 914 smc_lgr_list.num += SMC_LGR_NUM_INCR;
915 memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
0cfdd8f9 916 INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
f528ba24 917 INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
0cfdd8f9 918 lgr->conns_all = RB_ROOT;
bc36d2fc 919 if (ini->is_smcd) {
c6ba7c9b 920 /* SMC-D specific settings */
8c81ba20
SR		 921 smcd = ini->ism_dev[ini->ism_selected];
922 get_device(smcd->ops->get_dev(smcd));
b40584d1
WG		 923 lgr->peer_gid.gid =
924 ini->ism_peer_gid[ini->ism_selected].gid;
925 lgr->peer_gid.gid_ext =
926 ini->ism_peer_gid[ini->ism_selected].gid_ext;
5c21c4cc
UB		 927 lgr->smcd = ini->ism_dev[ini->ism_selected];
928 lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
a0a62ee1 929 lgr_lock = &lgr->smcd->lgr_lock;
b81a5eb7 930 lgr->smc_version = ini->smcd_version;
50c6b20e 931 lgr->peer_shutdown = 0;
5c21c4cc 932 atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
c6ba7c9b
HW		 933 } else {
934 /* SMC-R specific settings */
e49300a6
KG		 935 struct smc_ib_device *ibdev;
936 int ibport;
937
c6ba7c9b 938 lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
e49300a6
KG		 939 lgr->smc_version = ini->smcr_version;
940 memcpy(lgr->peer_systemid, ini->peer_systemid,
bc36d2fc 941 SMC_SYSTEMID_LEN);
e49300a6
KG		 942 if (lgr->smc_version == SMC_V2) {
943 ibdev = ini->smcrv2.ib_dev_v2;
944 ibport = ini->smcrv2.ib_port_v2;
945 lgr->saddr = ini->smcrv2.saddr;
946 lgr->uses_gateway = ini->smcrv2.uses_gateway;
947 memcpy(lgr->nexthop_mac, ini->smcrv2.nexthop_mac,
948 ETH_ALEN);
7f0620b9 949 lgr->max_conns = ini->max_conns;
69b888e3 950 lgr->max_links = ini->max_links;
e49300a6
KG		 951 } else {
952 ibdev = ini->ib_dev;
953 ibport = ini->ib_port;
7f0620b9 954 lgr->max_conns = SMC_CONN_PER_LGR_MAX;
69b888e3 955 lgr->max_links = SMC_LINKS_ADD_LNK_MAX;
e49300a6
KG		 956 }
957 memcpy(lgr->pnet_id, ibdev->pnetid[ibport - 1],
35dcf7ec 958 SMC_MAX_PNETID_LEN);
bdee15e8
DC		 959 rc = smc_wr_alloc_lgr_mem(lgr);
960 if (rc)
8799e310 961 goto free_wq;
00a049cf
KG		 962 smc_llc_lgr_init(lgr, smc);
963
026c381f
KG		 964 link_idx = SMC_SINGLE_LINK;
965 lnk = &lgr->lnk[link_idx];
966 rc = smcr_link_init(lgr, lnk, link_idx, ini);
8799e310
KG		 967 if (rc) {
968 smc_wr_free_lgr_mem(lgr);
22ef473d 969 goto free_wq;
8799e310 970 }
0237a3a6 971 lgr->net = smc_ib_net(lnk->smcibdev);
f3c1dedd
KG		 972 lgr_list = &smc_lgr_list.list;
973 lgr_lock = &smc_lgr_list.lock;
b984f370 974 lgr->buf_type = lgr->net->smc.sysctl_smcr_buf_type;
6dabd405 975 atomic_inc(&lgr_cnt);
c6ba7c9b 976 }
0cfdd8f9 977 smc->conn.lgr = lgr;
a0a62ee1 978 spin_lock_bh(lgr_lock);
a9e44502 979 list_add_tail(&lgr->list, lgr_list);
a0a62ee1 980 spin_unlock_bh(lgr_lock);
f38ba179
UB		 981 return 0;
982
22ef473d
KG		 983free_wq:
984 destroy_workqueue(lgr->tx_wq);
f38ba179
UB		 985free_lgr:
986 kfree(lgr);
29ee2701
UB		 987ism_put_vlan:
988 if (ini->is_smcd && ini->vlan_id)
5c21c4cc 989 smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
0cfdd8f9 990out:
7a62725a
KG		 991 if (rc < 0) {
992 if (rc == -ENOMEM)
993 rc = SMC_CLC_DECL_MEM;
994 else
995 rc = SMC_CLC_DECL_INTERR;
996 }
0cfdd8f9
UB		 997 return rc;
998}
999
c6f02ebe
KG		 1000static int smc_write_space(struct smc_connection *conn)
1001{
1002 int buffer_len = conn->peer_rmbe_size;
1003 union smc_host_cursor prod;
1004 union smc_host_cursor cons;
1005 int space;
1006
1007 smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
1008 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
1009 /* determine rx_buf space */
1010 space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
1011 return space;
1012}
1013
b8ded9de
KG		 1014static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
1015 struct smc_wr_buf *wr_buf)
c6f02ebe
KG		 1016{
1017 struct smc_connection *conn = &smc->conn;
1018 union smc_host_cursor cons, fin;
1019 int rc = 0;
1020 int diff;
1021
1022 smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
1023 smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
1024 /* set prod cursor to old state, enforce tx_rdma_writes() */
1025 smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
1026 smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
1027
1028 if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
1029 /* cons cursor advanced more than fin, and prod was set
1030 * fin above, so now prod is smaller than cons. Fix that.
1031 */
1032 diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
1033 smc_curs_add(conn->sndbuf_desc->len,
1034 &conn->tx_curs_sent, diff);
1035 smc_curs_add(conn->sndbuf_desc->len,
1036 &conn->tx_curs_fin, diff);
1037
1038 smp_mb__before_atomic();
1039 atomic_add(diff, &conn->sndbuf_space);
1040 smp_mb__after_atomic();
1041
1042 smc_curs_add(conn->peer_rmbe_size,
1043 &conn->local_tx_ctrl.prod, diff);
1044 smc_curs_add(conn->peer_rmbe_size,
1045 &conn->local_tx_ctrl_fin, diff);
1046 }
1047 /* recalculate, value is used by tx_rdma_writes() */
1048 atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
1049
1050 if (smc->sk.sk_state != SMC_INIT &&
1051 smc->sk.sk_state != SMC_CLOSED) {
b8ded9de 1052 rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
c6f02ebe 1053 if (!rc) {
22ef473d 1054 queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
c6f02ebe
KG		 1055 smc->sk.sk_data_ready(&smc->sk);
1056 }
b8ded9de
KG		 1057 } else {
1058 smc_wr_tx_put_slot(conn->lnk,
1059 (struct smc_wr_tx_pend_priv *)pend);
c6f02ebe
KG		 1060 }
1061 return rc;
1062}
1063
64513d26
GG		 1064void smc_switch_link_and_count(struct smc_connection *conn,
1065 struct smc_link *to_lnk)
07d51580
GG		 1066{
1067 atomic_dec(&conn->lnk->conn_cnt);
20c9398d
WG		 1068 /* link_hold in smc_conn_create() */
1069 smcr_link_put(conn->lnk);
07d51580
GG		 1070 conn->lnk = to_lnk;
1071 atomic_inc(&conn->lnk->conn_cnt);
20c9398d
WG		 1072 /* link_put in smc_conn_free() */
1073 smcr_link_hold(conn->lnk);
07d51580
GG		 1074}
1075
c6f02ebe
KG		 1076struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
1077 struct smc_link *from_lnk, bool is_dev_err)
1078{
1079 struct smc_link *to_lnk = NULL;
b8ded9de 1080 struct smc_cdc_tx_pend *pend;
c6f02ebe 1081 struct smc_connection *conn;
b8ded9de 1082 struct smc_wr_buf *wr_buf;
c6f02ebe
KG		 1083 struct smc_sock *smc;
1084 struct rb_node *node;
1085 int i, rc = 0;
1086
1087 /* link is inactive, wake up tx waiters */
1088 smc_wr_wakeup_tx_wait(from_lnk);
1089
1090 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 1091 if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
c6f02ebe
KG		 1092 continue;
1093 if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
1094 from_lnk->ibport == lgr->lnk[i].ibport) {
1095 continue;
1096 }
1097 to_lnk = &lgr->lnk[i];
1098 break;
1099 }
95f7f3e7 1100 if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) {
c6f02ebe
KG		 1101 smc_lgr_terminate_sched(lgr);
1102 return NULL;
1103 }
1104again:
1105 read_lock_bh(&lgr->conns_lock);
1106 for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
1107 conn = rb_entry(node, struct smc_connection, alert_node);
1108 if (conn->lnk != from_lnk)
1109 continue;
1110 smc = container_of(conn, struct smc_sock, conn);
1111 /* conn->lnk not yet set in SMC_INIT state */
1112 if (smc->sk.sk_state == SMC_INIT)
1113 continue;
1114 if (smc->sk.sk_state == SMC_CLOSED ||
1115 smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
1116 smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
1117 smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
1118 smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
1119 smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
1120 smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
1121 smc->sk.sk_state == SMC_PEERABORTWAIT ||
1122 smc->sk.sk_state == SMC_PROCESSABORT) {
1123 spin_lock_bh(&conn->send_lock);
07d51580 1124 smc_switch_link_and_count(conn, to_lnk);
c6f02ebe
KG		 1125 spin_unlock_bh(&conn->send_lock);
1126 continue;
1127 }
1128 sock_hold(&smc->sk);
1129 read_unlock_bh(&lgr->conns_lock);
b8ded9de
KG		 1130 /* pre-fetch buffer outside of send_lock, might sleep */
1131 rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
95f7f3e7
KG		 1132 if (rc)
1133 goto err_out;
c6f02ebe
KG		 1134 /* avoid race with smcr_tx_sndbuf_nonempty() */
1135 spin_lock_bh(&conn->send_lock);
07d51580 1136 smc_switch_link_and_count(conn, to_lnk);
b8ded9de 1137 rc = smc_switch_cursor(smc, pend, wr_buf);
c6f02ebe
KG		 1138 spin_unlock_bh(&conn->send_lock);
1139 sock_put(&smc->sk);
95f7f3e7
KG		 1140 if (rc)
1141 goto err_out;
c6f02ebe
KG		 1142 goto again;
1143 }
1144 read_unlock_bh(&lgr->conns_lock);
95f7f3e7 1145 smc_wr_tx_link_put(to_lnk);
c6f02ebe 1146 return to_lnk;
95f7f3e7
KG		 1147
1148err_out:
1149 smcr_link_down_cond_sched(to_lnk);
1150 smc_wr_tx_link_put(to_lnk);
1151 return NULL;
c6f02ebe
KG		 1152}
1153
b8d19945 1154static void smcr_buf_unuse(struct smc_buf_desc *buf_desc, bool is_rmb,
6d74c3a8 1155 struct smc_link_group *lgr)
b9247544 1156{
aff7bfed 1157 struct rw_semaphore *lock; /* lock buffer list */
d5500667
KG		 1158 int rc;
1159
b8d19945 1160 if (is_rmb && buf_desc->is_conf_rkey && !list_empty(&lgr->list)) {
b9247544 1161 /* unregister rmb with peer */
d5500667
KG		 1162 rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
1163 if (!rc) {
1164 /* protect against smc_llc_cli_rkey_exchange() */
f6421014 1165 down_read(&lgr->llc_conf_mutex);
b8d19945
WG		 1166 smc_llc_do_delete_rkey(lgr, buf_desc);
1167 buf_desc->is_conf_rkey = false;
f6421014 1168 up_read(&lgr->llc_conf_mutex);
d5500667
KG		 1169 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1170 }
b9247544 1171 }
d5500667 1172
b8d19945 1173 if (buf_desc->is_reg_err) {
b9247544 1174 /* buf registration failed, reuse not possible */
b8d19945
WG		 1175 lock = is_rmb ? &lgr->rmbs_lock :
1176 &lgr->sndbufs_lock;
aff7bfed 1177 down_write(lock);
d386d59b 1178 smc_lgr_buf_list_del(lgr, is_rmb, buf_desc);
aff7bfed 1179 up_write(lock);
b9247544 1180
b8d19945 1181 smc_buf_free(lgr, is_rmb, buf_desc);
b9247544 1182 } else {
475f9ff6
W		 1183 /* memzero_explicit provides potential memory barrier semantics */
1184 memzero_explicit(buf_desc->cpu_addr, buf_desc->len);
1185 WRITE_ONCE(buf_desc->used, 0);
b9247544
KG		 1186 }
1187}
1188
ae2be35c
WG		 1189static void smcd_buf_detach(struct smc_connection *conn)
1190{
1191 struct smcd_dev *smcd = conn->lgr->smcd;
1192 u64 peer_token = conn->peer_token;
1193
1194 if (!conn->sndbuf_desc)
1195 return;
1196
1197 smc_ism_detach_dmb(smcd, peer_token);
1198
1199 kfree(conn->sndbuf_desc);
1200 conn->sndbuf_desc = NULL;
1201}
1202
fb692ec4
KG		 1203static void smc_buf_unuse(struct smc_connection *conn,
1204 struct smc_link_group *lgr)
cd6851f3 1205{
e0d10354
WG		 1206 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1207 bool is_smcd = lgr->is_smcd;
1208 int bufsize;
1209
1c552696 1210 if (conn->sndbuf_desc) {
e0d10354
WG		 1211 bufsize = conn->sndbuf_desc->len;
1212 if (!is_smcd && conn->sndbuf_desc->is_vm) {
b8d19945
WG		 1213 smcr_buf_unuse(conn->sndbuf_desc, false, lgr);
1214 } else {
e0d10354 1215 memzero_explicit(conn->sndbuf_desc->cpu_addr, bufsize);
475f9ff6 1216 WRITE_ONCE(conn->sndbuf_desc->used, 0);
b8d19945 1217 }
e0d10354 1218 SMC_STAT_RMB_SIZE(smc, is_smcd, false, false, bufsize);
1c552696 1219 }
b8d19945 1220 if (conn->rmb_desc) {
e0d10354
WG		 1221 bufsize = conn->rmb_desc->len;
1222 if (!is_smcd) {
b8d19945
WG		 1223 smcr_buf_unuse(conn->rmb_desc, true, lgr);
1224 } else {
e0d10354
WG		 1225 bufsize += sizeof(struct smcd_cdc_msg);
1226 memzero_explicit(conn->rmb_desc->cpu_addr, bufsize);
475f9ff6 1227 WRITE_ONCE(conn->rmb_desc->used, 0);
b8d19945 1228 }
e0d10354 1229 SMC_STAT_RMB_SIZE(smc, is_smcd, true, false, bufsize);
1c552696 1230 }
cd6851f3
UB		 1231}
1232
0cfdd8f9
UB		 1233/* remove a finished connection from its link group */
1234void smc_conn_free(struct smc_connection *conn)
1235{
fb692ec4
KG		 1236 struct smc_link_group *lgr = conn->lgr;
1237
61f434b0
WG		 1238 if (!lgr || conn->freed)
1239 /* Connection has never been registered in a
1240 * link group, or has already been freed.
1241 */
0cfdd8f9 1242 return;
61f434b0
WG		 1243
1244 conn->freed = 1;
ea89c6c0 1245 if (!smc_conn_lgr_valid(conn))
61f434b0
WG		 1246 /* Connection has already unregistered from
1247 * link group.
1248 */
1249 goto lgr_put;
1250
fb692ec4 1251 if (lgr->is_smcd) {
42bfba9e
UB		 1252 if (!list_empty(&lgr->list))
1253 smc_ism_unset_conn(conn);
ae2be35c
WG		 1254 if (smc_ism_support_dmb_nocopy(lgr->smcd))
1255 smcd_buf_detach(conn);
be244f28
HW		 1256 tasklet_kill(&conn->rx_tsklet);
1257 } else {
349d4312 1258 smc_cdc_wait_pend_tx_wr(conn);
b286a065
KG		 1259 if (current_work() != &conn->abort_work)
1260 cancel_work_sync(&conn->abort_work);
be244f28 1261 }
2a0674ff 1262 if (!list_empty(&lgr->list)) {
2a0674ff 1263 smc_buf_unuse(conn, lgr); /* allow buffer reuse */
0537f0a2 1264 smc_lgr_unregister_conn(conn);
2a0674ff 1265 }
fb692ec4
KG		 1266
1267 if (!lgr->conns_num)
1268 smc_lgr_schedule_free_work(lgr);
61f434b0 1269lgr_put:
20c9398d
WG		 1270 if (!lgr->is_smcd)
1271 smcr_link_put(conn->lnk); /* link_hold in smc_conn_create() */
61f434b0 1272 smc_lgr_put(lgr); /* lgr_hold in smc_conn_create() */
0cfdd8f9
UB		 1273}
1274
4a3641c1
KG		 1275/* unregister a link from a buf_desc */
1276static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
1277 struct smc_link *lnk)
1278{
b8d19945 1279 if (is_rmb || buf_desc->is_vm)
4a3641c1
KG		 1280 buf_desc->is_reg_mr[lnk->link_idx] = false;
1281 if (!buf_desc->is_map_ib[lnk->link_idx])
1282 return;
b8d19945
WG		 1283
1284 if ((is_rmb || buf_desc->is_vm) &&
1285 buf_desc->mr[lnk->link_idx]) {
1286 smc_ib_put_memory_region(buf_desc->mr[lnk->link_idx]);
1287 buf_desc->mr[lnk->link_idx] = NULL;
1288 }
1289 if (is_rmb)
4a3641c1 1290 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
b8d19945 1291 else
4a3641c1 1292 smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
b8d19945 1293
4a3641c1
KG		 1294 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
1295 buf_desc->is_map_ib[lnk->link_idx] = false;
1296}
1297
1298/* unmap all buffers of lgr for a deleted link */
1299static void smcr_buf_unmap_lgr(struct smc_link *lnk)
1300{
1301 struct smc_link_group *lgr = lnk->lgr;
1302 struct smc_buf_desc *buf_desc, *bf;
1303 int i;
1304
1305 for (i = 0; i < SMC_RMBE_SIZES; i++) {
aff7bfed 1306 down_write(&lgr->rmbs_lock);
4a3641c1
KG		 1307 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
1308 smcr_buf_unmap_link(buf_desc, true, lnk);
aff7bfed
W		 1309 up_write(&lgr->rmbs_lock);
1310
1311 down_write(&lgr->sndbufs_lock);
4a3641c1
KG		 1312 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
1313 list)
1314 smcr_buf_unmap_link(buf_desc, false, lnk);
aff7bfed 1315 up_write(&lgr->sndbufs_lock);
4a3641c1
KG		 1316 }
1317}
1318
1319static void smcr_rtoken_clear_link(struct smc_link *lnk)
1320{
1321 struct smc_link_group *lgr = lnk->lgr;
1322 int i;
1323
1324 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
1325 lgr->rtokens[i][lnk->link_idx].rkey = 0;
1326 lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
1327 }
1328}
1329
20c9398d 1330static void __smcr_link_clear(struct smc_link *lnk)
0cfdd8f9 1331{
61f434b0 1332 struct smc_link_group *lgr = lnk->lgr;
d854fcbf
KG		 1333 struct smc_ib_device *smcibdev;
1334
f38ba179 1335 smc_wr_free_link_mem(lnk);
ddc99286 1336 smc_ibdev_cnt_dec(lnk);
f3c1dedd 1337 put_device(&lnk->smcibdev->ibdev->dev);
d854fcbf
KG		 1338 smcibdev = lnk->smcibdev;
1339 memset(lnk, 0, sizeof(struct smc_link));
1340 lnk->state = SMC_LNK_UNUSED;
1341 if (!atomic_dec_return(&smcibdev->lnk_cnt))
1342 wake_up(&smcibdev->lnks_deleted);
61f434b0 1343 smc_lgr_put(lgr); /* lgr_hold in smcr_link_init() */
0cfdd8f9
UB		 1344}
1345
20c9398d
WG		 1346/* must be called under lgr->llc_conf_mutex lock */
1347void smcr_link_clear(struct smc_link *lnk, bool log)
1348{
1349 if (!lnk->lgr || lnk->clearing ||
1350 lnk->state == SMC_LNK_UNUSED)
1351 return;
1352 lnk->clearing = 1;
1353 lnk->peer_qpn = 0;
1354 smc_llc_link_clear(lnk, log);
1355 smcr_buf_unmap_lgr(lnk);
1356 smcr_rtoken_clear_link(lnk);
1357 smc_ib_modify_qp_error(lnk);
1358 smc_wr_free_link(lnk);
1359 smc_ib_destroy_queue_pair(lnk);
1360 smc_ib_dealloc_protection_domain(lnk);
1361 smcr_link_put(lnk); /* theoretically last link_put */
1362}
1363
1364void smcr_link_hold(struct smc_link *lnk)
1365{
1366 refcount_inc(&lnk->refcnt);
1367}
1368
1369void smcr_link_put(struct smc_link *lnk)
1370{
1371 if (refcount_dec_and_test(&lnk->refcnt))
1372 __smcr_link_clear(lnk);
1373}
1374
c6ba7c9b
HW		 1375static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
1376 struct smc_buf_desc *buf_desc)
cd6851f3 1377{
b9247544 1378 int i;
6511aad3 1379
4a3641c1
KG		 1380 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1381 smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
387707fd 1382
b8d19945 1383 if (!buf_desc->is_vm && buf_desc->pages)
2ef4f27a 1384 __free_pages(buf_desc->pages, buf_desc->order);
b8d19945
WG		 1385 else if (buf_desc->is_vm && buf_desc->cpu_addr)
1386 vfree(buf_desc->cpu_addr);
3e034725 1387 kfree(buf_desc);
cd6851f3
UB		 1388}
1389
c6ba7c9b
HW		 1390static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
1391 struct smc_buf_desc *buf_desc)
1392{
be244f28
HW		 1393 if (is_dmb) {
1394 /* restore original buf len */
1395 buf_desc->len += sizeof(struct smcd_cdc_msg);
c6ba7c9b 1396 smc_ism_unregister_dmb(lgr->smcd, buf_desc);
be244f28 1397 } else {
c6ba7c9b 1398 kfree(buf_desc->cpu_addr);
be244f28 1399 }
c6ba7c9b
HW		 1400 kfree(buf_desc);
1401}
1402
1403static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
1404 struct smc_buf_desc *buf_desc)
1405{
1406 if (lgr->is_smcd)
1407 smcd_buf_free(lgr, is_rmb, buf_desc);
1408 else
1409 smcr_buf_free(lgr, is_rmb, buf_desc);
1410}
1411
3e034725 1412static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
cd6851f3 1413{
3e034725
UB		 1414 struct smc_buf_desc *buf_desc, *bf_desc;
1415 struct list_head *buf_list;
cd6851f3
UB		 1416 int i;
1417
1418 for (i = 0; i < SMC_RMBE_SIZES; i++) {
3e034725
UB		 1419 if (is_rmb)
1420 buf_list = &lgr->rmbs[i];
1421 else
1422 buf_list = &lgr->sndbufs[i];
1423 list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
cd6851f3 1424 list) {
d386d59b 1425 smc_lgr_buf_list_del(lgr, is_rmb, buf_desc);
6511aad3 1426 smc_buf_free(lgr, is_rmb, buf_desc);
cd6851f3
UB		 1427 }
1428 }
1429}
1430
3e034725
UB		 1431static void smc_lgr_free_bufs(struct smc_link_group *lgr)
1432{
1433 /* free send buffers */
1434 __smc_lgr_free_bufs(lgr, false);
1435 /* free rmbs */
1436 __smc_lgr_free_bufs(lgr, true);
1437}
1438
61f434b0
WG		 1439/* won't be freed until no one accesses to lgr anymore */
1440static void __smc_lgr_free(struct smc_link_group *lgr)
1441{
1442 smc_lgr_free_bufs(lgr);
1443 if (lgr->is_smcd) {
1444 if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
1445 wake_up(&lgr->smcd->lgrs_deleted);
1446 } else {
1447 smc_wr_free_lgr_mem(lgr);
1448 if (!atomic_dec_return(&lgr_cnt))
1449 wake_up(&lgrs_deleted);
1450 }
1451 kfree(lgr);
1452}
1453
0cfdd8f9 1454/* remove a link group */
3f3f0e36 1455static void smc_lgr_free(struct smc_link_group *lgr)
0cfdd8f9 1456{
b9247544
KG		 1457 int i;
1458
a52bcc91 1459 if (!lgr->is_smcd) {
b5dd4d69 1460 down_write(&lgr->llc_conf_mutex);
a52bcc91
KG		 1461 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1462 if (lgr->lnk[i].state != SMC_LNK_UNUSED)
0a99be43 1463 smcr_link_clear(&lgr->lnk[i], false);
a52bcc91 1464 }
b5dd4d69 1465 up_write(&lgr->llc_conf_mutex);
a52bcc91
KG		 1466 smc_llc_lgr_clear(lgr);
1467 }
1468
22ef473d 1469 destroy_workqueue(lgr->tx_wq);
b3cb53c0 1470 if (lgr->is_smcd) {
f9aab6f2 1471 smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
8c81ba20 1472 put_device(lgr->smcd->ops->get_dev(lgr->smcd));
b3cb53c0 1473 }
61f434b0
WG		 1474 smc_lgr_put(lgr); /* theoretically last lgr_put */
1475}
1476
1477void smc_lgr_hold(struct smc_link_group *lgr)
1478{
1479 refcount_inc(&lgr->refcnt);
1480}
1481
1482void smc_lgr_put(struct smc_link_group *lgr)
1483{
1484 if (refcount_dec_and_test(&lgr->refcnt))
1485 __smc_lgr_free(lgr);
0cfdd8f9
UB		 1486}
1487
2a0674ff
UB		 1488static void smc_sk_wake_ups(struct smc_sock *smc)
1489{
1490 smc->sk.sk_write_space(&smc->sk);
1491 smc->sk.sk_data_ready(&smc->sk);
1492 smc->sk.sk_state_change(&smc->sk);
1493}
1494
1495/* kill a connection */
5421ec28 1496static void smc_conn_kill(struct smc_connection *conn, bool soft)
2a0674ff
UB		 1497{
1498 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1499
50c6b20e
UB		 1500 if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
1501 conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
1502 else
1503 smc_close_abort(conn);
2a0674ff 1504 conn->killed = 1;
50c6b20e 1505 smc->sk.sk_err = ECONNABORTED;
2a0674ff 1506 smc_sk_wake_ups(smc);
42bfba9e
UB		 1507 if (conn->lgr->is_smcd) {
1508 smc_ism_unset_conn(conn);
ae2be35c
WG		 1509 if (smc_ism_support_dmb_nocopy(conn->lgr->smcd))
1510 smcd_buf_detach(conn);
5421ec28
UB		 1511 if (soft)
1512 tasklet_kill(&conn->rx_tsklet);
1513 else
1514 tasklet_unlock_wait(&conn->rx_tsklet);
6a37ad3d 1515 } else {
349d4312 1516 smc_cdc_wait_pend_tx_wr(conn);
42bfba9e 1517 }
2a0674ff 1518 smc_lgr_unregister_conn(conn);
81cf4f47 1519 smc_close_active_abort(smc);
2a0674ff
UB		 1520}
1521
42bfba9e
UB		 1522static void smc_lgr_cleanup(struct smc_link_group *lgr)
1523{
1524 if (lgr->is_smcd) {
1525 smc_ism_signal_shutdown(lgr);
42bfba9e 1526 } else {
3e0c40af
KG		 1527 u32 rsn = lgr->llc_termination_rsn;
1528
1529 if (!rsn)
1530 rsn = SMC_LLC_DEL_PROG_INIT_TERM;
1531 smc_llc_send_link_delete_all(lgr, false, rsn);
a52bcc91 1532 smcr_lgr_link_deactivate_all(lgr);
42bfba9e
UB		 1533 }
1534}
1535
ba952060
KG		 1536/* terminate link group
1537 * @soft: true if link group shutdown can take its time
1538 * false if immediate link group shutdown is required
1539 */
5421ec28 1540static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
0cfdd8f9
UB		 1541{
1542 struct smc_connection *conn;
b38d7324 1543 struct smc_sock *smc;
0cfdd8f9
UB		 1544 struct rb_node *node;
1545
517c300e
KG		 1546 if (lgr->terminating)
1547 return; /* lgr already terminating */
a52bcc91 1548 /* cancel free_work sync, will terminate when lgr->freeing is set */
13085e1b 1549 cancel_delayed_work(&lgr->free_work);
517c300e 1550 lgr->terminating = 1;
0cfdd8f9 1551
69318b52
UB		 1552 /* kill remaining link group connections */
1553 read_lock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 1554 node = rb_first(&lgr->conns_all);
1555 while (node) {
69318b52 1556 read_unlock_bh(&lgr->conns_lock);
0cfdd8f9 1557 conn = rb_entry(node, struct smc_connection, alert_node);
b38d7324 1558 smc = container_of(conn, struct smc_sock, conn);
81cf4f47 1559 sock_hold(&smc->sk); /* sock_put below */
69318b52 1560 lock_sock(&smc->sk);
5421ec28 1561 smc_conn_kill(conn, soft);
69318b52 1562 release_sock(&smc->sk);
81cf4f47 1563 sock_put(&smc->sk); /* sock_hold above */
69318b52 1564 read_lock_bh(&lgr->conns_lock);
0cfdd8f9
UB		 1565 node = rb_first(&lgr->conns_all);
1566 }
69318b52 1567 read_unlock_bh(&lgr->conns_lock);
42bfba9e 1568 smc_lgr_cleanup(lgr);
a52bcc91 1569 smc_lgr_free(lgr);
0cfdd8f9
UB		 1570}
1571
5f78fe96
KG		 1572/* unlink link group and schedule termination */
1573void smc_lgr_terminate_sched(struct smc_link_group *lgr)
b9f227c3 1574{
a0a62ee1
UB		 1575 spinlock_t *lgr_lock;
1576
1577 smc_lgr_list_head(lgr, &lgr_lock);
1578 spin_lock_bh(lgr_lock);
3739707c 1579 if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
8caa6544
UB		 1580 spin_unlock_bh(lgr_lock);
1581 return; /* lgr already terminating */
1582 }
1583 list_del_init(&lgr->list);
a52bcc91 1584 lgr->freeing = 1;
a0a62ee1 1585 spin_unlock_bh(lgr_lock);
5f78fe96 1586 schedule_work(&lgr->terminate_work);
b9f227c3
HW		 1587}
1588
5421ec28 1589/* Called when peer lgr shutdown (regularly or abnormally) is received */
b40584d1
WG		 1590void smc_smcd_terminate(struct smcd_dev *dev, struct smcd_gid *peer_gid,
1591 unsigned short vlan)
c6ba7c9b
HW		 1592{
1593 struct smc_link_group *lgr, *l;
1594 LIST_HEAD(lgr_free_list);
1595
1596 /* run common cleanup function and build free list */
a0a62ee1 1597 spin_lock_bh(&dev->lgr_lock);
a2351c5d 1598 list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
b40584d1
WG		 1599 if ((!peer_gid->gid ||
1600 (lgr->peer_gid.gid == peer_gid->gid &&
b27696cd 1601 !smc_ism_is_emulated(dev) ? 1 :
b40584d1 1602 lgr->peer_gid.gid_ext == peer_gid->gid_ext)) &&
0512f69e 1603 (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
b40584d1 1604 if (peer_gid->gid) /* peer triggered termination */
50c6b20e 1605 lgr->peer_shutdown = 1;
c6ba7c9b 1606 list_move(&lgr->list, &lgr_free_list);
a52bcc91 1607 lgr->freeing = 1;
c6ba7c9b
HW		 1608 }
1609 }
a0a62ee1 1610 spin_unlock_bh(&dev->lgr_lock);
c6ba7c9b
HW		 1611
1612 /* cancel the regular free workers and actually free lgrs */
1613 list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
1614 list_del_init(&lgr->list);
50c6b20e 1615 schedule_work(&lgr->terminate_work);
c6ba7c9b
HW		 1616 }
1617}
1618
5421ec28
UB		 1619/* Called when an SMCD device is removed or the smc module is unloaded */
1620void smc_smcd_terminate_all(struct smcd_dev *smcd)
1621{
1622 struct smc_link_group *lgr, *lg;
1623 LIST_HEAD(lgr_free_list);
1624
1625 spin_lock_bh(&smcd->lgr_lock);
1626 list_splice_init(&smcd->lgr_list, &lgr_free_list);
1627 list_for_each_entry(lgr, &lgr_free_list, list)
1628 lgr->freeing = 1;
1629 spin_unlock_bh(&smcd->lgr_lock);
1630
1631 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1632 list_del_init(&lgr->list);
1633 __smc_lgr_terminate(lgr, false);
1634 }
5edd6b9c
UB		 1635
1636 if (atomic_read(&smcd->lgr_cnt))
1637 wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
5421ec28
UB		 1638}
1639
0b29ec64
UB		 1640/* Called when an SMCR device is removed or the smc module is unloaded.
1641 * If smcibdev is given, all SMCR link groups using this device are terminated.
1642 * If smcibdev is NULL, all SMCR link groups are terminated.
1643 */
1644void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
1645{
1646 struct smc_link_group *lgr, *lg;
1647 LIST_HEAD(lgr_free_list);
b9247544 1648 int i;
0b29ec64
UB		 1649
1650 spin_lock_bh(&smc_lgr_list.lock);
1651 if (!smcibdev) {
1652 list_splice_init(&smc_lgr_list.list, &lgr_free_list);
1653 list_for_each_entry(lgr, &lgr_free_list, list)
1654 lgr->freeing = 1;
1655 } else {
1656 list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
b9247544 1657 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
87523930 1658 if (lgr->lnk[i].smcibdev == smcibdev)
56d99e81 1659 smcr_link_down_cond_sched(&lgr->lnk[i]);
0b29ec64
UB		 1660 }
1661 }
1662 }
1663 spin_unlock_bh(&smc_lgr_list.lock);
1664
1665 list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
1666 list_del_init(&lgr->list);
3e0c40af 1667 smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
0b29ec64 1668 __smc_lgr_terminate(lgr, false);
349d4312
DL		 1669 }
1670
6dabd405
UB		 1671 if (smcibdev) {
1672 if (atomic_read(&smcibdev->lnk_cnt))
1673 wait_event(smcibdev->lnks_deleted,
1674 !atomic_read(&smcibdev->lnk_cnt));
1675 } else {
1676 if (atomic_read(&lgr_cnt))
1677 wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
1678 }
0b29ec64
UB		 1679}
1680
ad6c111b
KG		 1681/* set new lgr type and clear all asymmetric link tagging */
1682void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
1683{
0a99be43 1684 char *lgr_type = "";
ad6c111b
KG		 1685 int i;
1686
1687 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
1688 if (smc_link_usable(&lgr->lnk[i]))
1689 lgr->lnk[i].link_is_asym = false;
0a99be43
KG		 1690 if (lgr->type == new_type)
1691 return;
ad6c111b 1692 lgr->type = new_type;
0a99be43
KG		 1693
1694 switch (lgr->type) {
1695 case SMC_LGR_NONE:
1696 lgr_type = "NONE";
1697 break;
1698 case SMC_LGR_SINGLE:
1699 lgr_type = "SINGLE";
1700 break;
1701 case SMC_LGR_SYMMETRIC:
1702 lgr_type = "SYMMETRIC";
1703 break;
1704 case SMC_LGR_ASYMMETRIC_PEER:
1705 lgr_type = "ASYMMETRIC_PEER";
1706 break;
1707 case SMC_LGR_ASYMMETRIC_LOCAL:
1708 lgr_type = "ASYMMETRIC_LOCAL";
1709 break;
1710 }
de2fea7b 1711 pr_warn_ratelimited("smc: SMC-R lg %*phN net %llu state changed: "
0a99be43 1712 "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
de2fea7b 1713 lgr->net->net_cookie, lgr_type, lgr->pnet_id);
ad6c111b
KG		 1714}
1715
1716/* set new lgr type and tag a link as asymmetric */
1717void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
1718 enum smc_lgr_type new_type, int asym_lnk_idx)
1719{
1720 smcr_lgr_set_type(lgr, new_type);
1721 lgr->lnk[asym_lnk_idx].link_is_asym = true;
1722}
1723
b286a065
KG		 1724/* abort connection, abort_work scheduled from tasklet context */
1725static void smc_conn_abort_work(struct work_struct *work)
1726{
1727 struct smc_connection *conn = container_of(work,
1728 struct smc_connection,
1729 abort_work);
1730 struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
1731
a18cee47 1732 lock_sock(&smc->sk);
b286a065 1733 smc_conn_kill(conn, true);
a18cee47 1734 release_sock(&smc->sk);
b286a065
KG		 1735 sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
1736}
1737
1f90a05d
KG		 1738void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
1739{
1f90a05d
KG		 1740 struct smc_link_group *lgr, *n;
1741
f5146e3e 1742 spin_lock_bh(&smc_lgr_list.lock);
1f90a05d 1743 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
c48254fa
KG		 1744 struct smc_link *link;
1745
1f90a05d
KG		 1746 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1747 SMC_MAX_PNETID_LEN) ||
1748 lgr->type == SMC_LGR_SYMMETRIC ||
0237a3a6
TL		 1749 lgr->type == SMC_LGR_ASYMMETRIC_PEER ||
1750 !rdma_dev_access_netns(smcibdev->ibdev, lgr->net))
1f90a05d 1751 continue;
c48254fa 1752
69b888e3
GW		 1753 if (lgr->type == SMC_LGR_SINGLE && lgr->max_links <= 1)
1754 continue;
1755
c48254fa
KG		 1756 /* trigger local add link processing */
1757 link = smc_llc_usable_link(lgr);
1758 if (link)
1759 smc_llc_add_link_local(link);
1f90a05d 1760 }
f5146e3e 1761 spin_unlock_bh(&smc_lgr_list.lock);
1f90a05d
KG		 1762}
1763
541afa10
KG		 1764/* link is down - switch connections to alternate link,
1765 * must be called under lgr->llc_conf_mutex lock
1766 */
1767static void smcr_link_down(struct smc_link *lnk)
1768{
1769 struct smc_link_group *lgr = lnk->lgr;
1770 struct smc_link *to_lnk;
1771 int del_link_id;
1772
1773 if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
1774 return;
1775
c6f02ebe 1776 to_lnk = smc_switch_conns(lgr, lnk, true);
541afa10 1777 if (!to_lnk) { /* no backup link available */
0a99be43 1778 smcr_link_clear(lnk, true);
541afa10
KG		 1779 return;
1780 }
ad6c111b 1781 smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
541afa10
KG		 1782 del_link_id = lnk->link_id;
1783
1784 if (lgr->role == SMC_SERV) {
1785 /* trigger local delete link processing */
4dadd151 1786 smc_llc_srv_delete_link_local(to_lnk, del_link_id);
541afa10
KG		 1787 } else {
1788 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1789 /* another llc task is ongoing */
b5dd4d69 1790 up_write(&lgr->llc_conf_mutex);
6778a6be
KG		 1791 wait_event_timeout(lgr->llc_flow_waiter,
1792 (list_empty(&lgr->list) ||
1793 lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
541afa10 1794 SMC_LLC_WAIT_TIME);
b5dd4d69 1795 down_write(&lgr->llc_conf_mutex);
541afa10 1796 }
68fd8942 1797 if (!list_empty(&lgr->list)) {
6778a6be
KG		 1798 smc_llc_send_delete_link(to_lnk, del_link_id,
1799 SMC_LLC_REQ, true,
1800 SMC_LLC_DEL_LOST_PATH);
68fd8942
KG		 1801 smcr_link_clear(lnk, true);
1802 }
6778a6be 1803 wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
541afa10
KG		 1804 }
1805}
1806
1807/* must be called under lgr->llc_conf_mutex lock */
1808void smcr_link_down_cond(struct smc_link *lnk)
1809{
a3a0e81b
TL		 1810 if (smc_link_downing(&lnk->state)) {
1811 trace_smcr_link_down(lnk, __builtin_return_address(0));
541afa10 1812 smcr_link_down(lnk);
a3a0e81b 1813 }
541afa10
KG		 1814}
1815
1816/* will get the lgr->llc_conf_mutex lock */
1817void smcr_link_down_cond_sched(struct smc_link *lnk)
1818{
a3a0e81b
TL		 1819 if (smc_link_downing(&lnk->state)) {
1820 trace_smcr_link_down(lnk, __builtin_return_address(0));
541afa10 1821 schedule_work(&lnk->link_down_wrk);
a3a0e81b 1822 }
541afa10
KG		 1823}
1824
1825void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
1826{
1827 struct smc_link_group *lgr, *n;
1828 int i;
1829
1830 list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
1831 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
1832 SMC_MAX_PNETID_LEN))
1833 continue; /* lgr is not affected */
1834 if (list_empty(&lgr->list))
1835 continue;
1836 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1837 struct smc_link *lnk = &lgr->lnk[i];
1838
1839 if (smc_link_usable(lnk) &&
1840 lnk->smcibdev == smcibdev && lnk->ibport == ibport)
1841 smcr_link_down_cond_sched(lnk);
1842 }
1843 }
1844}
1845
541afa10
KG		 1846static void smc_link_down_work(struct work_struct *work)
1847{
1848 struct smc_link *link = container_of(work, struct smc_link,
1849 link_down_wrk);
1850 struct smc_link_group *lgr = link->lgr;
1851
1852 if (list_empty(&lgr->list))
1853 return;
6778a6be 1854 wake_up_all(&lgr->llc_msg_waiter);
b5dd4d69 1855 down_write(&lgr->llc_conf_mutex);
541afa10 1856 smcr_link_down(link);
b5dd4d69 1857 up_write(&lgr->llc_conf_mutex);
541afa10
KG		 1858}
1859
587acad4
KG		 1860static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
1861 struct netdev_nested_priv *priv)
1862{
1863 unsigned short *vlan_id = (unsigned short *)priv->data;
1864
1865 if (is_vlan_dev(lower_dev)) {
1866 *vlan_id = vlan_dev_vlan_id(lower_dev);
1867 return 1;
1868 }
1869
1870 return 0;
1871}
1872
1873/* Determine vlan of internal TCP socket. */
bc36d2fc 1874int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
0cfdd8f9
UB		 1875{
1876 struct dst_entry *dst = sk_dst_get(clcsock->sk);
587acad4 1877 struct netdev_nested_priv priv;
cb9d43f6 1878 struct net_device *ndev;
587acad4 1879 int rc = 0;
0cfdd8f9 1880
bc36d2fc 1881 ini->vlan_id = 0;
0cfdd8f9
UB		 1882 if (!dst) {
1883 rc = -ENOTCONN;
1884 goto out;
1885 }
1886 if (!dst->dev) {
1887 rc = -ENODEV;
1888 goto out_rel;
1889 }
1890
cb9d43f6
UB		 1891 ndev = dst->dev;
1892 if (is_vlan_dev(ndev)) {
bc36d2fc 1893 ini->vlan_id = vlan_dev_vlan_id(ndev);
cb9d43f6
UB		 1894 goto out_rel;
1895 }
1896
587acad4 1897 priv.data = (void *)&ini->vlan_id;
cb9d43f6 1898 rtnl_lock();
587acad4 1899 netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
cb9d43f6 1900 rtnl_unlock();
0cfdd8f9
UB		 1901
1902out_rel:
1903 dst_release(dst);
1904out:
1905 return rc;
1906}
1907
e49300a6
KG		 1908static bool smcr_lgr_match(struct smc_link_group *lgr, u8 smcr_version,
1909 u8 peer_systemid[],
1910 u8 peer_gid[],
1911 u8 peer_mac_v1[],
0237a3a6
TL		 1912 enum smc_lgr_role role, u32 clcqpn,
1913 struct net *net)
0cfdd8f9 1914{
0237a3a6 1915 struct smc_link *lnk;
b9247544
KG		 1916 int i;
1917
e49300a6 1918 if (memcmp(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN) ||
b9247544
KG		 1919 lgr->role != role)
1920 return false;
1921
1922 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
0237a3a6
TL		 1923 lnk = &lgr->lnk[i];
1924
1925 if (!smc_link_active(lnk))
b9247544 1926 continue;
0237a3a6
TL		 1927 /* use verbs API to check netns, instead of lgr->net */
1928 if (!rdma_dev_access_netns(lnk->smcibdev->ibdev, net))
1929 return false;
1930 if ((lgr->role == SMC_SERV || lnk->peer_qpn == clcqpn) &&
1931 !memcmp(lnk->peer_gid, peer_gid, SMC_GID_SIZE) &&
e49300a6 1932 (smcr_version == SMC_V2 ||
0237a3a6 1933 !memcmp(lnk->peer_mac, peer_mac_v1, ETH_ALEN)))
b9247544
KG		 1934 return true;
1935 }
1936 return false;
c6ba7c9b 1937}
0cfdd8f9 1938
c6ba7c9b 1939static bool smcd_lgr_match(struct smc_link_group *lgr,
b40584d1
WG		 1940 struct smcd_dev *smcismdev,
1941 struct smcd_gid *peer_gid)
c6ba7c9b 1942{
c3dfcdb6
WG		 1943 if (lgr->peer_gid.gid != peer_gid->gid ||
1944 lgr->smcd != smcismdev)
1945 return false;
1946
b27696cd 1947 if (smc_ism_is_emulated(smcismdev) &&
c3dfcdb6
WG		 1948 lgr->peer_gid.gid_ext != peer_gid->gid_ext)
1949 return false;
1950
1951 return true;
0cfdd8f9
UB		 1952}
1953
1954/* create a new SMC connection (and a new link group if necessary) */
bc36d2fc 1955int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
0cfdd8f9
UB		 1956{
1957 struct smc_connection *conn = &smc->conn;
0237a3a6 1958 struct net *net = sock_net(&smc->sk);
a2351c5d 1959 struct list_head *lgr_list;
0cfdd8f9 1960 struct smc_link_group *lgr;
0cfdd8f9 1961 enum smc_lgr_role role;
a0a62ee1 1962 spinlock_t *lgr_lock;
0cfdd8f9
UB		 1963 int rc = 0;
1964
5c21c4cc 1965 lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
3fc64937 1966 &smc_lgr_list.list;
5c21c4cc 1967 lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
3fc64937 1968 &smc_lgr_list.lock;
5ac54d87 1969 ini->first_contact_local = 1;
0cfdd8f9 1970 role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
5ac54d87 1971 if (role == SMC_CLNT && ini->first_contact_peer)
0cfdd8f9
UB		 1972 /* create new link group as well */
1973 goto create;
1974
1975 /* determine if an existing link group can be reused */
a0a62ee1 1976 spin_lock_bh(lgr_lock);
a2351c5d 1977 list_for_each_entry(lgr, lgr_list, list) {
0cfdd8f9 1978 write_lock_bh(&lgr->conns_lock);
bc36d2fc 1979 if ((ini->is_smcd ?
5c21c4cc 1980 smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
b40584d1 1981 &ini->ism_peer_gid[ini->ism_selected]) :
e49300a6
KG		 1982 smcr_lgr_match(lgr, ini->smcr_version,
1983 ini->peer_systemid,
1984 ini->peer_gid, ini->peer_mac, role,
0237a3a6 1985 ini->ib_clcqpn, net)) &&
0cfdd8f9 1986 !lgr->sync_err &&
0530bd6e
KG		 1987 (ini->smcd_version == SMC_V2 ||
1988 lgr->vlan_id == ini->vlan_id) &&
a9e44502 1989 (role == SMC_CLNT || ini->is_smcd ||
7f0620b9 1990 (lgr->conns_num < lgr->max_conns &&
4940a1fd 1991 !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) {
0cfdd8f9 1992 /* link group found */
5ac54d87 1993 ini->first_contact_local = 0;
0cfdd8f9 1994 conn->lgr = lgr;
56bc3b20 1995 rc = smc_lgr_register_conn(conn, false);
0cfdd8f9 1996 write_unlock_bh(&lgr->conns_lock);
b9247544
KG		 1997 if (!rc && delayed_work_pending(&lgr->free_work))
1998 cancel_delayed_work(&lgr->free_work);
0cfdd8f9
UB		 1999 break;
2000 }
2001 write_unlock_bh(&lgr->conns_lock);
2002 }
a0a62ee1 2003 spin_unlock_bh(lgr_lock);
b9247544
KG		 2004 if (rc)
2005 return rc;
0cfdd8f9 2006
5ac54d87
UB		 2007 if (role == SMC_CLNT && !ini->first_contact_peer &&
2008 ini->first_contact_local) {
0cfdd8f9
UB		 2009 /* Server reuses a link group, but Client wants to start
2010 * a new one
2011 * send out_of_sync decline, reason synchr. error
2012 */
7a62725a 2013 return SMC_CLC_DECL_SYNCERR;
0cfdd8f9
UB		 2014 }
2015
2016create:
5ac54d87 2017 if (ini->first_contact_local) {
bc36d2fc 2018 rc = smc_lgr_create(smc, ini);
0cfdd8f9
UB		 2019 if (rc)
2020 goto out;
44808792
HZ		 2021 lgr = conn->lgr;
2022 write_lock_bh(&lgr->conns_lock);
56bc3b20 2023 rc = smc_lgr_register_conn(conn, true);
44808792 2024 write_unlock_bh(&lgr->conns_lock);
36595d8a
WG		 2025 if (rc) {
2026 smc_lgr_cleanup_early(lgr);
b9247544 2027 goto out;
36595d8a 2028 }
0cfdd8f9 2029 }
61f434b0 2030 smc_lgr_hold(conn->lgr); /* lgr_put in smc_conn_free() */
20c9398d
WG		 2031 if (!conn->lgr->is_smcd)
2032 smcr_link_hold(conn->lnk); /* link_put in smc_conn_free() */
61f434b0 2033 conn->freed = 0;
5f08318f 2034 conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
cbba07a7 2035 conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
de8474eb 2036 conn->urg_state = SMC_URG_READ;
349d4312 2037 init_waitqueue_head(&conn->cdc_pend_tx_wq);
b286a065 2038 INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
bc36d2fc 2039 if (ini->is_smcd) {
be244f28
HW		 2040 conn->rx_off = sizeof(struct smcd_cdc_msg);
2041 smcd_cdc_rx_init(conn); /* init tasklet for this conn */
2d2bfeb8
UB		 2042 } else {
2043 conn->rx_off = 0;
be244f28 2044 }
5f08318f
UB		 2045#ifndef KERNEL_HAS_ATOMIC64
2046 spin_lock_init(&conn->acurs_lock);
2047#endif
0cfdd8f9
UB		 2048
2049out:
7a62725a 2050 return rc;
0cfdd8f9 2051}
cd6851f3 2052
67161779 2053#define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
2f4b101c 2054#define SMCR_RMBE_SIZES 15 /* 0 -> 16KB, 1 -> 32KB, .. 15 -> 512MB */
67161779
SR		 2055
2056/* convert the RMB size into the compressed notation (minimum 16K, see
2057 * SMCD/R_DMBE_SIZES.
2f6becaf
HW		 2058 * In contrast to plain ilog2, this rounds towards the next power of 2,
2059 * so the socket application gets at least its desired sndbuf / rcvbuf size.
2060 */
67161779 2061static u8 smc_compress_bufsize(int size, bool is_smcd, bool is_rmb)
2f6becaf
HW		 2062{
2063 u8 compressed;
2064
2065 if (size <= SMC_BUF_MIN_SIZE)
2066 return 0;
2067
67161779
SR		 2068 size = (size - 1) >> 14; /* convert to 16K multiple */
2069 compressed = min_t(u8, ilog2(size) + 1,
2070 is_smcd ? SMCD_DMBE_SIZES : SMCR_RMBE_SIZES);
2071
3ac14b9d 2072#ifdef CONFIG_ARCH_NO_SG_CHAIN
67161779
SR		 2073 if (!is_smcd && is_rmb)
2074 /* RMBs are backed by & limited to max size of scatterlists */
3ac14b9d
GW		 2075 compressed = min_t(u8, compressed, ilog2((SG_MAX_SINGLE_ALLOC * PAGE_SIZE) >> 14));
2076#endif
67161779 2077
2f6becaf
HW		 2078 return compressed;
2079}
2080
2081/* convert the RMB size from compressed notation into integer */
2082int smc_uncompress_bufsize(u8 compressed)
2083{
2084 u32 size;
2085
2086 size = 0x00000001 << (((int)compressed) + 14);
2087 return (int)size;
2088}
2089
3e034725
UB		 2090/* try to reuse a sndbuf or rmb description slot for a certain
2091 * buffer size; if not available, return NULL
cd6851f3 2092 */
8437bda0 2093static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
aff7bfed 2094 struct rw_semaphore *lock,
8437bda0 2095 struct list_head *buf_list)
cd6851f3 2096{
3e034725 2097 struct smc_buf_desc *buf_slot;
cd6851f3 2098
aff7bfed 2099 down_read(lock);
3e034725
UB		 2100 list_for_each_entry(buf_slot, buf_list, list) {
2101 if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
aff7bfed 2102 up_read(lock);
3e034725 2103 return buf_slot;
cd6851f3
UB		 2104 }
2105 }
aff7bfed 2106 up_read(lock);
cd6851f3
UB		 2107 return NULL;
2108}
2109
952310cc
UB		 2110/* one of the conditions for announcing a receiver's current window size is
2111 * that it "results in a minimum increase in the window size of 10% of the
2112 * receive buffer space" [RFC7609]
2113 */
2114static inline int smc_rmb_wnd_update_limit(int rmbe_size)
2115{
6bf536eb 2116 return max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
952310cc
UB		 2117}
2118
b8d19945 2119/* map an buf to a link */
b9247544
KG		 2120static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
2121 struct smc_link *lnk)
2122{
b8d19945
WG		 2123 int rc, i, nents, offset, buf_size, size, access_flags;
2124 struct scatterlist *sg;
2125 void *buf;
b9247544
KG		 2126
2127 if (buf_desc->is_map_ib[lnk->link_idx])
2128 return 0;
2129
b8d19945
WG		 2130 if (buf_desc->is_vm) {
2131 buf = buf_desc->cpu_addr;
2132 buf_size = buf_desc->len;
2133 offset = offset_in_page(buf_desc->cpu_addr);
2134 nents = PAGE_ALIGN(buf_size + offset) / PAGE_SIZE;
2135 } else {
2136 nents = 1;
2137 }
2138
2139 rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], nents, GFP_KERNEL);
b9247544
KG		 2140 if (rc)
2141 return rc;
b8d19945
WG		 2142
2143 if (buf_desc->is_vm) {
2144 /* virtually contiguous buffer */
2145 for_each_sg(buf_desc->sgt[lnk->link_idx].sgl, sg, nents, i) {
2146 size = min_t(int, PAGE_SIZE - offset, buf_size);
2147 sg_set_page(sg, vmalloc_to_page(buf), size, offset);
2148 buf += size / sizeof(*buf);
2149 buf_size -= size;
2150 offset = 0;
2151 }
2152 } else {
2153 /* physically contiguous buffer */
2154 sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
2155 buf_desc->cpu_addr, buf_desc->len);
2156 }
b9247544
KG		 2157
2158 /* map sg table to DMA address */
2159 rc = smc_ib_buf_map_sg(lnk, buf_desc,
2160 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2161 /* SMC protocol depends on mapping to one DMA address only */
b8d19945 2162 if (rc != nents) {
b9247544
KG		 2163 rc = -EAGAIN;
2164 goto free_table;
2165 }
2166
0ef69e78
GW		 2167 buf_desc->is_dma_need_sync |=
2168 smc_ib_is_sg_need_sync(lnk, buf_desc) << lnk->link_idx;
2169
b8d19945
WG		 2170 if (is_rmb || buf_desc->is_vm) {
2171 /* create a new memory region for the RMB or vzalloced sndbuf */
2172 access_flags = is_rmb ?
2173 IB_ACCESS_REMOTE_WRITE | IB_ACCESS_LOCAL_WRITE :
2174 IB_ACCESS_LOCAL_WRITE;
2175
2176 rc = smc_ib_get_memory_region(lnk->roce_pd, access_flags,
b9247544
KG		 2177 buf_desc, lnk->link_idx);
2178 if (rc)
2179 goto buf_unmap;
b8d19945
WG		 2180 smc_ib_sync_sg_for_device(lnk, buf_desc,
2181 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
b9247544
KG		 2182 }
2183 buf_desc->is_map_ib[lnk->link_idx] = true;
2184 return 0;
2185
2186buf_unmap:
2187 smc_ib_buf_unmap_sg(lnk, buf_desc,
2188 is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
2189free_table:
2190 sg_free_table(&buf_desc->sgt[lnk->link_idx]);
2191 return rc;
2192}
2193
b8d19945 2194/* register a new buf on IB device, rmb or vzalloced sndbuf
d5500667
KG		 2195 * must be called under lgr->llc_conf_mutex lock
2196 */
b8d19945 2197int smcr_link_reg_buf(struct smc_link *link, struct smc_buf_desc *buf_desc)
7562a13d
KG		 2198{
2199 if (list_empty(&link->lgr->list))
2200 return -ENOLINK;
b8d19945
WG		 2201 if (!buf_desc->is_reg_mr[link->link_idx]) {
2202 /* register memory region for new buf */
2203 if (buf_desc->is_vm)
2204 buf_desc->mr[link->link_idx]->iova =
2205 (uintptr_t)buf_desc->cpu_addr;
2206 if (smc_wr_reg_send(link, buf_desc->mr[link->link_idx])) {
2207 buf_desc->is_reg_err = true;
7562a13d
KG		 2208 return -EFAULT;
2209 }
b8d19945 2210 buf_desc->is_reg_mr[link->link_idx] = true;
7562a13d
KG		 2211 }
2212 return 0;
2213}
2214
aff7bfed 2215static int _smcr_buf_map_lgr(struct smc_link *lnk, struct rw_semaphore *lock,
fb33d277
KG		 2216 struct list_head *lst, bool is_rmb)
2217{
2218 struct smc_buf_desc *buf_desc, *bf;
2219 int rc = 0;
2220
aff7bfed 2221 down_write(lock);
fb33d277
KG		 2222 list_for_each_entry_safe(buf_desc, bf, lst, list) {
2223 if (!buf_desc->used)
2224 continue;
2225 rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
2226 if (rc)
2227 goto out;
2228 }
2229out:
aff7bfed 2230 up_write(lock);
fb33d277
KG		 2231 return rc;
2232}
2233
2234/* map all used buffers of lgr for a new link */
2235int smcr_buf_map_lgr(struct smc_link *lnk)
2236{
2237 struct smc_link_group *lgr = lnk->lgr;
2238 int i, rc = 0;
2239
2240 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2241 rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
2242 &lgr->rmbs[i], true);
2243 if (rc)
2244 return rc;
2245 rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
2246 &lgr->sndbufs[i], false);
2247 if (rc)
2248 return rc;
2249 }
2250 return 0;
2251}
2252
d5500667
KG		 2253/* register all used buffers of lgr for a new link,
2254 * must be called under lgr->llc_conf_mutex lock
2255 */
fb33d277
KG		 2256int smcr_buf_reg_lgr(struct smc_link *lnk)
2257{
2258 struct smc_link_group *lgr = lnk->lgr;
2259 struct smc_buf_desc *buf_desc, *bf;
2260 int i, rc = 0;
2261
b8d19945 2262 /* reg all RMBs for a new link */
aff7bfed 2263 down_write(&lgr->rmbs_lock);
fb33d277
KG		 2264 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2265 list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
2266 if (!buf_desc->used)
2267 continue;
b8d19945
WG		 2268 rc = smcr_link_reg_buf(lnk, buf_desc);
2269 if (rc) {
aff7bfed 2270 up_write(&lgr->rmbs_lock);
b8d19945
WG		 2271 return rc;
2272 }
fb33d277
KG		 2273 }
2274 }
aff7bfed 2275 up_write(&lgr->rmbs_lock);
b8d19945
WG		 2276
2277 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS)
2278 return rc;
2279
2280 /* reg all vzalloced sndbufs for a new link */
aff7bfed 2281 down_write(&lgr->sndbufs_lock);
b8d19945
WG		 2282 for (i = 0; i < SMC_RMBE_SIZES; i++) {
2283 list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i], list) {
2284 if (!buf_desc->used || !buf_desc->is_vm)
2285 continue;
2286 rc = smcr_link_reg_buf(lnk, buf_desc);
2287 if (rc) {
aff7bfed 2288 up_write(&lgr->sndbufs_lock);
b8d19945
WG		 2289 return rc;
2290 }
2291 }
2292 }
aff7bfed 2293 up_write(&lgr->sndbufs_lock);
fb33d277
KG		 2294 return rc;
2295}
2296
c6ba7c9b 2297static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
0908503a 2298 int bufsize)
b33982c3
UB		 2299{
2300 struct smc_buf_desc *buf_desc;
b33982c3
UB		 2301
2302 /* try to alloc a new buffer */
2303 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2304 if (!buf_desc)
2305 return ERR_PTR(-ENOMEM);
2306
b8d19945
WG		 2307 switch (lgr->buf_type) {
2308 case SMCR_PHYS_CONT_BUFS:
2309 case SMCR_MIXED_BUFS:
2310 buf_desc->order = get_order(bufsize);
2311 buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
2312 __GFP_NOMEMALLOC | __GFP_COMP |
2313 __GFP_NORETRY | __GFP_ZERO,
2314 buf_desc->order);
2315 if (buf_desc->pages) {
2316 buf_desc->cpu_addr =
2317 (void *)page_address(buf_desc->pages);
2318 buf_desc->len = bufsize;
2319 buf_desc->is_vm = false;
2320 break;
2321 }
2322 if (lgr->buf_type == SMCR_PHYS_CONT_BUFS)
2323 goto out;
2324 fallthrough; // try virtually continguous buf
2325 case SMCR_VIRT_CONT_BUFS:
2326 buf_desc->order = get_order(bufsize);
2327 buf_desc->cpu_addr = vzalloc(PAGE_SIZE << buf_desc->order);
2328 if (!buf_desc->cpu_addr)
2329 goto out;
2330 buf_desc->pages = NULL;
2331 buf_desc->len = bufsize;
2332 buf_desc->is_vm = true;
2333 break;
2334 }
b9247544 2335 return buf_desc;
b8d19945
WG		 2336
2337out:
2338 kfree(buf_desc);
2339 return ERR_PTR(-EAGAIN);
b9247544 2340}
b33982c3 2341
b9247544
KG		 2342/* map buf_desc on all usable links,
2343 * unused buffers stay mapped as long as the link is up
2344 */
2345static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
2346 struct smc_buf_desc *buf_desc, bool is_rmb)
2347{
e738455b 2348 int i, rc = 0, cnt = 0;
b33982c3 2349
d5500667 2350 /* protect against parallel link reconfiguration */
f6421014 2351 down_read(&lgr->llc_conf_mutex);
b9247544
KG		 2352 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
2353 struct smc_link *lnk = &lgr->lnk[i];
b33982c3 2354
d854fcbf 2355 if (!smc_link_usable(lnk))
b9247544
KG		 2356 continue;
2357 if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
b9247544
KG		 2358 rc = -ENOMEM;
2359 goto out;
b33982c3 2360 }
e738455b 2361 cnt++;
b33982c3 2362 }
b9247544 2363out:
f6421014 2364 up_read(&lgr->llc_conf_mutex);
e738455b
WG		 2365 if (!rc && !cnt)
2366 rc = -EINVAL;
b9247544 2367 return rc;
b33982c3
UB		 2368}
2369
c6ba7c9b
HW		 2370static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
2371 bool is_dmb, int bufsize)
2372{
2373 struct smc_buf_desc *buf_desc;
2374 int rc;
2375
c6ba7c9b
HW		 2376 /* try to alloc a new DMB */
2377 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2378 if (!buf_desc)
2379 return ERR_PTR(-ENOMEM);
2380 if (is_dmb) {
2381 rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
2382 if (rc) {
2383 kfree(buf_desc);
96d6fded
KG		 2384 if (rc == -ENOMEM)
2385 return ERR_PTR(-EAGAIN);
2386 if (rc == -ENOSPC)
2387 return ERR_PTR(-ENOSPC);
2388 return ERR_PTR(-EIO);
c6ba7c9b 2389 }
be244f28
HW		 2390 buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
2391 /* CDC header stored in buf. So, pretend it was smaller */
2392 buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
c6ba7c9b
HW		 2393 } else {
2394 buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
2395 __GFP_NOWARN | __GFP_NORETRY |
2396 __GFP_NOMEMALLOC);
2397 if (!buf_desc->cpu_addr) {
2398 kfree(buf_desc);
2399 return ERR_PTR(-EAGAIN);
2400 }
2401 buf_desc->len = bufsize;
2402 }
2403 return buf_desc;
2404}
2405
2406static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
cd6851f3 2407{
8437bda0 2408 struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
cd6851f3
UB		 2409 struct smc_connection *conn = &smc->conn;
2410 struct smc_link_group *lgr = conn->lgr;
3e034725 2411 struct list_head *buf_list;
833bac7e 2412 int bufsize, bufsize_comp;
aff7bfed 2413 struct rw_semaphore *lock; /* lock buffer list */
e0e4b8fa 2414 bool is_dgraded = false;
cd6851f3 2415
3e034725
UB		 2416 if (is_rmb)
2417 /* use socket recv buffer size (w/o overhead) as start value */
833bac7e 2418 bufsize = smc->sk.sk_rcvbuf / 2;
3e034725
UB		 2419 else
2420 /* use socket send buffer size (w/o overhead) as start value */
833bac7e 2421 bufsize = smc->sk.sk_sndbuf / 2;
3e034725 2422
833bac7e
GB		 2423 for (bufsize_comp = smc_compress_bufsize(bufsize, is_smcd, is_rmb);
2424 bufsize_comp >= 0; bufsize_comp--) {
3e034725
UB		 2425 if (is_rmb) {
2426 lock = &lgr->rmbs_lock;
833bac7e 2427 buf_list = &lgr->rmbs[bufsize_comp];
3e034725
UB		 2428 } else {
2429 lock = &lgr->sndbufs_lock;
833bac7e 2430 buf_list = &lgr->sndbufs[bufsize_comp];
9d8fb617 2431 }
833bac7e 2432 bufsize = smc_uncompress_bufsize(bufsize_comp);
a3fe3d01 2433
3e034725 2434 /* check for reusable slot in the link group */
833bac7e 2435 buf_desc = smc_buf_get_slot(bufsize_comp, lock, buf_list);
3e034725 2436 if (buf_desc) {
0ef69e78 2437 buf_desc->is_dma_need_sync = 0;
e0d10354 2438 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, true, bufsize);
194730a9 2439 SMC_STAT_BUF_REUSE(smc, is_smcd, is_rmb);
cd6851f3
UB		 2440 break; /* found reusable slot */
2441 }
a3fe3d01 2442
c6ba7c9b
HW		 2443 if (is_smcd)
2444 buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
2445 else
0908503a 2446 buf_desc = smcr_new_buf_create(lgr, bufsize);
c6ba7c9b 2447
b33982c3
UB		 2448 if (PTR_ERR(buf_desc) == -ENOMEM)
2449 break;
e0e4b8fa
GG		 2450 if (IS_ERR(buf_desc)) {
2451 if (!is_dgraded) {
2452 is_dgraded = true;
194730a9 2453 SMC_STAT_RMB_DOWNGRADED(smc, is_smcd, is_rmb);
e0e4b8fa 2454 }
a3fe3d01 2455 continue;
e0e4b8fa 2456 }
897e1c24 2457
194730a9 2458 SMC_STAT_RMB_ALLOC(smc, is_smcd, is_rmb);
e0d10354 2459 SMC_STAT_RMB_SIZE(smc, is_smcd, is_rmb, true, bufsize);
3e034725 2460 buf_desc->used = 1;
aff7bfed 2461 down_write(lock);
d386d59b 2462 smc_lgr_buf_list_add(lgr, is_rmb, buf_list, buf_desc);
aff7bfed 2463 up_write(lock);
3e034725 2464 break; /* found */
cd6851f3 2465 }
3e034725 2466
b33982c3 2467 if (IS_ERR(buf_desc))
72b7f6c4 2468 return PTR_ERR(buf_desc);
3e034725 2469
b9247544
KG		 2470 if (!is_smcd) {
2471 if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
b8d19945 2472 smcr_buf_unuse(buf_desc, is_rmb, lgr);
b9247544
KG		 2473 return -ENOMEM;
2474 }
2475 }
2476
3e034725
UB		 2477 if (is_rmb) {
2478 conn->rmb_desc = buf_desc;
833bac7e
GB		 2479 conn->rmbe_size_comp = bufsize_comp;
2480 smc->sk.sk_rcvbuf = bufsize * 2;
5f08318f 2481 atomic_set(&conn->bytes_to_rcv, 0);
be244f28
HW		 2482 conn->rmbe_update_limit =
2483 smc_rmb_wnd_update_limit(buf_desc->len);
c6ba7c9b
HW		 2484 if (is_smcd)
2485 smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
cd6851f3 2486 } else {
3e034725 2487 conn->sndbuf_desc = buf_desc;
833bac7e 2488 smc->sk.sk_sndbuf = bufsize * 2;
3e034725 2489 atomic_set(&conn->sndbuf_space, bufsize);
cd6851f3 2490 }
3e034725
UB		 2491 return 0;
2492}
2493
10428dd8
UB		 2494void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
2495{
0ef69e78
GW		 2496 if (!conn->sndbuf_desc->is_dma_need_sync)
2497 return;
ea89c6c0
WG		 2498 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd ||
2499 !smc_link_active(conn->lnk))
c6ba7c9b 2500 return;
387707fd 2501 smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
10428dd8
UB		 2502}
2503
2504void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
2505{
b9247544 2506 int i;
10428dd8 2507
0ef69e78
GW		 2508 if (!conn->rmb_desc->is_dma_need_sync)
2509 return;
ea89c6c0 2510 if (!smc_conn_lgr_valid(conn) || conn->lgr->is_smcd)
c6ba7c9b 2511 return;
b9247544 2512 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
741a49a4 2513 if (!smc_link_active(&conn->lgr->lnk[i]))
b9247544
KG		 2514 continue;
2515 smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
2516 DMA_FROM_DEVICE);
2517 }
10428dd8
UB		 2518}
2519
3e034725
UB		 2520/* create the send and receive buffer for an SMC socket;
2521 * receive buffers are called RMBs;
2522 * (even though the SMC protocol allows more than one RMB-element per RMB,
2523 * the Linux implementation uses just one RMB-element per RMB, i.e. uses an
2524 * extra RMB for every connection in a link group
2525 */
c6ba7c9b 2526int smc_buf_create(struct smc_sock *smc, bool is_smcd)
3e034725
UB		 2527{
2528 int rc;
2529
2530 /* create send buffer */
ae2be35c
WG		 2531 if (is_smcd &&
2532 smc_ism_support_dmb_nocopy(smc->conn.lgr->smcd))
2533 goto create_rmb;
2534
c6ba7c9b 2535 rc = __smc_buf_create(smc, is_smcd, false);
3e034725
UB		 2536 if (rc)
2537 return rc;
ae2be35c
WG		 2538
2539create_rmb:
3e034725 2540 /* create rmb */
c6ba7c9b 2541 rc = __smc_buf_create(smc, is_smcd, true);
ae2be35c 2542 if (rc && smc->conn.sndbuf_desc) {
aff7bfed 2543 down_write(&smc->conn.lgr->sndbufs_lock);
d386d59b
WG		 2544 smc_lgr_buf_list_del(smc->conn.lgr, false,
2545 smc->conn.sndbuf_desc);
aff7bfed 2546 up_write(&smc->conn.lgr->sndbufs_lock);
6511aad3 2547 smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
1d8df41d 2548 smc->conn.sndbuf_desc = NULL;
fd7f3a74 2549 }
3e034725 2550 return rc;
cd6851f3 2551}
bd4ad577 2552
ae2be35c
WG		 2553int smcd_buf_attach(struct smc_sock *smc)
2554{
2555 struct smc_connection *conn = &smc->conn;
2556 struct smcd_dev *smcd = conn->lgr->smcd;
2557 u64 peer_token = conn->peer_token;
2558 struct smc_buf_desc *buf_desc;
2559 int rc;
2560
2561 buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
2562 if (!buf_desc)
2563 return -ENOMEM;
2564
2565 /* The ghost sndbuf_desc describes the same memory region as
2566 * peer RMB. Its lifecycle is consistent with the connection's
2567 * and it will be freed with the connections instead of the
2568 * link group.
2569 */
2570 rc = smc_ism_attach_dmb(smcd, peer_token, buf_desc);
2571 if (rc)
2572 goto free;
2573
2574 smc->sk.sk_sndbuf = buf_desc->len;
2575 buf_desc->cpu_addr =
2576 (u8 *)buf_desc->cpu_addr + sizeof(struct smcd_cdc_msg);
2577 buf_desc->len -= sizeof(struct smcd_cdc_msg);
2578 conn->sndbuf_desc = buf_desc;
2579 conn->sndbuf_desc->used = 1;
2580 atomic_set(&conn->sndbuf_space, conn->sndbuf_desc->len);
2581 return 0;
2582
2583free:
2584 kfree(buf_desc);
2585 return rc;
2586}
2587
bd4ad577
UB		 2588static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
2589{
2590 int i;
2591
2592 for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
2593 if (!test_and_set_bit(i, lgr->rtokens_used_mask))
2594 return i;
2595 }
2596 return -ENOSPC;
2597}
2598
ba21abd2
KG		 2599static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
2600 u32 rkey)
2601{
2602 int i;
2603
2604 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
2605 if (test_bit(i, lgr->rtokens_used_mask) &&
2606 lgr->rtokens[i][lnk_idx].rkey == rkey)
2607 return i;
2608 }
2609 return -ENOENT;
2610}
2611
2612/* set rtoken for a new link to an existing rmb */
2613void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
2614 __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
2615{
2616 int rtok_idx;
2617
2618 rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
2619 if (rtok_idx == -ENOENT)
2620 return;
2621 lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
2622 lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
2623}
2624
2625/* set rtoken for a new link whose link_id is given */
2626void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
2627 __be64 nw_vaddr, __be32 nw_rkey)
2628{
2629 u64 dma_addr = be64_to_cpu(nw_vaddr);
2630 u32 rkey = ntohl(nw_rkey);
2631 bool found = false;
2632 int link_idx;
2633
2634 for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
2635 if (lgr->lnk[link_idx].link_id == link_id) {
2636 found = true;
2637 break;
2638 }
2639 }
2640 if (!found)
2641 return;
2642 lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
2643 lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
2644}
2645
4ed75de5 2646/* add a new rtoken from peer */
387707fd 2647int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
bd4ad577 2648{
387707fd 2649 struct smc_link_group *lgr = smc_get_lgr(lnk);
4ed75de5
KG		 2650 u64 dma_addr = be64_to_cpu(nw_vaddr);
2651 u32 rkey = ntohl(nw_rkey);
bd4ad577
UB		 2652 int i;
2653
2654 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
387707fd
KG		 2655 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
2656 lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
bd4ad577 2657 test_bit(i, lgr->rtokens_used_mask)) {
4ed75de5
KG		 2658 /* already in list */
2659 return i;
2660 }
2661 }
2662 i = smc_rmb_reserve_rtoken_idx(lgr);
2663 if (i < 0)
2664 return i;
387707fd
KG		 2665 lgr->rtokens[i][lnk->link_idx].rkey = rkey;
2666 lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
4ed75de5
KG		 2667 return i;
2668}
2669
e07d31dc 2670/* delete an rtoken from all links */
387707fd 2671int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
4ed75de5 2672{
387707fd 2673 struct smc_link_group *lgr = smc_get_lgr(lnk);
4ed75de5 2674 u32 rkey = ntohl(nw_rkey);
e07d31dc 2675 int i, j;
4ed75de5
KG		 2676
2677 for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
387707fd 2678 if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
4ed75de5 2679 test_bit(i, lgr->rtokens_used_mask)) {
e07d31dc
KG		 2680 for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
2681 lgr->rtokens[i][j].rkey = 0;
2682 lgr->rtokens[i][j].dma_addr = 0;
2683 }
4ed75de5 2684 clear_bit(i, lgr->rtokens_used_mask);
bd4ad577
UB		 2685 return 0;
2686 }
2687 }
4ed75de5
KG		 2688 return -ENOENT;
2689}
2690
2691/* save rkey and dma_addr received from peer during clc handshake */
2692int smc_rmb_rtoken_handling(struct smc_connection *conn,
e07d31dc 2693 struct smc_link *lnk,
4ed75de5
KG		 2694 struct smc_clc_msg_accept_confirm *clc)
2695{
3d9725a6
UB		 2696 conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
2697 clc->r0.rmb_rkey);
bd4ad577
UB		 2698 if (conn->rtoken_idx < 0)
2699 return conn->rtoken_idx;
bd4ad577
UB		 2700 return 0;
2701}
9fda3510 2702
c3d9494e
UB		 2703static void smc_core_going_away(void)
2704{
2705 struct smc_ib_device *smcibdev;
2706 struct smcd_dev *smcd;
2707
92f3cb0e 2708 mutex_lock(&smc_ib_devices.mutex);
c3d9494e
UB		 2709 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
2710 int i;
2711
2712 for (i = 0; i < SMC_MAX_PORTS; i++)
2713 set_bit(i, smcibdev->ports_going_away);
2714 }
92f3cb0e 2715 mutex_unlock(&smc_ib_devices.mutex);
c3d9494e 2716
82087c03 2717 mutex_lock(&smcd_dev_list.mutex);
c3d9494e
UB		 2718 list_for_each_entry(smcd, &smcd_dev_list.list, list) {
2719 smcd->going_away = 1;
2720 }
82087c03 2721 mutex_unlock(&smcd_dev_list.mutex);
c3d9494e
UB		 2722}
2723
5421ec28
UB		 2724/* Clean up all SMC link groups */
2725static void smc_lgrs_shutdown(void)
9fda3510 2726{
a2351c5d 2727 struct smcd_dev *smcd;
9fda3510 2728
c3d9494e
UB		 2729 smc_core_going_away();
2730
0b29ec64 2731 smc_smcr_terminate_all(NULL);
a2351c5d 2732
82087c03 2733 mutex_lock(&smcd_dev_list.mutex);
a2351c5d 2734 list_for_each_entry(smcd, &smcd_dev_list.list, list)
5421ec28 2735 smc_smcd_terminate_all(smcd);
82087c03 2736 mutex_unlock(&smcd_dev_list.mutex);
9fda3510 2737}
5421ec28 2738
a33a803c
UB		 2739static int smc_core_reboot_event(struct notifier_block *this,
2740 unsigned long event, void *ptr)
2741{
2742 smc_lgrs_shutdown();
28a3b840 2743 smc_ib_unregister_client();
8747716f 2744 smc_ism_exit();
a33a803c
UB		 2745 return 0;
2746}
2747
2748static struct notifier_block smc_reboot_notifier = {
2749 .notifier_call = smc_core_reboot_event,
2750};
2751
6dabd405
UB		 2752int __init smc_core_init(void)
2753{
a33a803c 2754 return register_reboot_notifier(&smc_reboot_notifier);
6dabd405
UB		 2755}
2756
5421ec28
UB		 2757/* Called (from smc_exit) when module is removed */
2758void smc_core_exit(void)
2759{
a33a803c 2760 unregister_reboot_notifier(&smc_reboot_notifier);
5421ec28
UB		 2761 smc_lgrs_shutdown();
2762}
Linux 6.x block layer and io_uring tree(s)