Commit | Line | Data |
---|---|---|
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> | |
16 | #include <net/tcp.h> | |
17 | #include <net/sock.h> | |
18 | #include <rdma/ib_verbs.h> | |
ddb457c6 | 19 | #include <rdma/ib_cache.h> |
0cfdd8f9 UB |
20 | |
21 | #include "smc.h" | |
22 | #include "smc_clc.h" | |
23 | #include "smc_core.h" | |
24 | #include "smc_ib.h" | |
f38ba179 | 25 | #include "smc_wr.h" |
9bf9abea | 26 | #include "smc_llc.h" |
5f08318f | 27 | #include "smc_cdc.h" |
b38d7324 | 28 | #include "smc_close.h" |
c6ba7c9b | 29 | #include "smc_ism.h" |
0cfdd8f9 | 30 | |
5bc11ddb UB |
31 | #define SMC_LGR_NUM_INCR 256 |
32 | #define SMC_LGR_FREE_DELAY_SERV (600 * HZ) | |
7f58a1ad | 33 | #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ) |
0d18a0cb | 34 | #define SMC_LGR_FREE_DELAY_FAST (8 * HZ) |
0cfdd8f9 | 35 | |
9fda3510 HW |
36 | static struct smc_lgr_list smc_lgr_list = { /* established link groups */ |
37 | .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock), | |
38 | .list = LIST_HEAD_INIT(smc_lgr_list.list), | |
39 | .num = 0, | |
40 | }; | |
9bf9abea | 41 | |
6511aad3 HW |
42 | static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, |
43 | struct smc_buf_desc *buf_desc); | |
a6920d1d | 44 | |
97cdbc42 KG |
45 | static void smc_lgr_schedule_free_work(struct smc_link_group *lgr) |
46 | { | |
47 | /* client link group creation always follows the server link group | |
48 | * creation. For client use a somewhat higher removal delay time, | |
49 | * otherwise there is a risk of out-of-sync link groups. | |
50 | */ | |
51 | mod_delayed_work(system_wq, &lgr->free_work, | |
c6ba7c9b HW |
52 | (!lgr->is_smcd && lgr->role == SMC_CLNT) ? |
53 | SMC_LGR_FREE_DELAY_CLNT : SMC_LGR_FREE_DELAY_SERV); | |
97cdbc42 KG |
54 | } |
55 | ||
0d18a0cb KG |
56 | void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr) |
57 | { | |
58 | mod_delayed_work(system_wq, &lgr->free_work, SMC_LGR_FREE_DELAY_FAST); | |
97cdbc42 KG |
59 | } |
60 | ||
0cfdd8f9 UB |
61 | /* Register connection's alert token in our lookup structure. |
62 | * To use rbtrees we have to implement our own insert core. | |
63 | * Requires @conns_lock | |
64 | * @smc connection to register | |
65 | * Returns 0 on success, != otherwise. | |
66 | */ | |
67 | static void smc_lgr_add_alert_token(struct smc_connection *conn) | |
68 | { | |
69 | struct rb_node **link, *parent = NULL; | |
70 | u32 token = conn->alert_token_local; | |
71 | ||
72 | link = &conn->lgr->conns_all.rb_node; | |
73 | while (*link) { | |
74 | struct smc_connection *cur = rb_entry(*link, | |
75 | struct smc_connection, alert_node); | |
76 | ||
77 | parent = *link; | |
78 | if (cur->alert_token_local > token) | |
79 | link = &parent->rb_left; | |
80 | else | |
81 | link = &parent->rb_right; | |
82 | } | |
83 | /* Put the new node there */ | |
84 | rb_link_node(&conn->alert_node, parent, link); | |
85 | rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); | |
86 | } | |
87 | ||
88 | /* Register connection in link group by assigning an alert token | |
89 | * registered in a search tree. | |
90 | * Requires @conns_lock | |
91 | * Note that '0' is a reserved value and not assigned. | |
92 | */ | |
93 | static void smc_lgr_register_conn(struct smc_connection *conn) | |
94 | { | |
95 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
96 | static atomic_t nexttoken = ATOMIC_INIT(0); | |
97 | ||
98 | /* find a new alert_token_local value not yet used by some connection | |
99 | * in this link group | |
100 | */ | |
101 | sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ | |
102 | while (!conn->alert_token_local) { | |
103 | conn->alert_token_local = atomic_inc_return(&nexttoken); | |
104 | if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) | |
105 | conn->alert_token_local = 0; | |
106 | } | |
107 | smc_lgr_add_alert_token(conn); | |
108 | conn->lgr->conns_num++; | |
109 | } | |
110 | ||
111 | /* Unregister connection and reset the alert token of the given connection< | |
112 | */ | |
113 | static void __smc_lgr_unregister_conn(struct smc_connection *conn) | |
114 | { | |
115 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
116 | struct smc_link_group *lgr = conn->lgr; | |
117 | ||
118 | rb_erase(&conn->alert_node, &lgr->conns_all); | |
119 | lgr->conns_num--; | |
120 | conn->alert_token_local = 0; | |
0cfdd8f9 UB |
121 | sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ |
122 | } | |
123 | ||
fb692ec4 | 124 | /* Unregister connection from lgr |
0cfdd8f9 UB |
125 | */ |
126 | static void smc_lgr_unregister_conn(struct smc_connection *conn) | |
127 | { | |
128 | struct smc_link_group *lgr = conn->lgr; | |
0cfdd8f9 | 129 | |
77f838ac KG |
130 | if (!lgr) |
131 | return; | |
0cfdd8f9 UB |
132 | write_lock_bh(&lgr->conns_lock); |
133 | if (conn->alert_token_local) { | |
0cfdd8f9 UB |
134 | __smc_lgr_unregister_conn(conn); |
135 | } | |
136 | write_unlock_bh(&lgr->conns_lock); | |
0cfdd8f9 UB |
137 | } |
138 | ||
0d18a0cb KG |
139 | /* Send delete link, either as client to request the initiation |
140 | * of the DELETE LINK sequence from server; or as server to | |
141 | * initiate the delete processing. See smc_llc_rx_delete_link(). | |
142 | */ | |
143 | static int smc_link_send_delete(struct smc_link *lnk) | |
144 | { | |
145 | if (lnk->state == SMC_LNK_ACTIVE && | |
146 | !smc_llc_send_delete_link(lnk, SMC_LLC_REQ, true)) { | |
147 | smc_llc_link_deleting(lnk); | |
148 | return 0; | |
149 | } | |
150 | return -ENOTCONN; | |
151 | } | |
152 | ||
3f3f0e36 UB |
153 | static void smc_lgr_free(struct smc_link_group *lgr); |
154 | ||
0cfdd8f9 UB |
155 | static void smc_lgr_free_work(struct work_struct *work) |
156 | { | |
157 | struct smc_link_group *lgr = container_of(to_delayed_work(work), | |
158 | struct smc_link_group, | |
159 | free_work); | |
160 | bool conns; | |
161 | ||
162 | spin_lock_bh(&smc_lgr_list.lock); | |
163 | read_lock_bh(&lgr->conns_lock); | |
164 | conns = RB_EMPTY_ROOT(&lgr->conns_all); | |
165 | read_unlock_bh(&lgr->conns_lock); | |
166 | if (!conns) { /* number of lgr connections is no longer zero */ | |
167 | spin_unlock_bh(&smc_lgr_list.lock); | |
168 | return; | |
169 | } | |
e78b2622 KG |
170 | if (!list_empty(&lgr->list)) |
171 | list_del_init(&lgr->list); /* remove from smc_lgr_list */ | |
0cfdd8f9 | 172 | spin_unlock_bh(&smc_lgr_list.lock); |
0d18a0cb KG |
173 | |
174 | if (!lgr->is_smcd && !lgr->terminating) { | |
90d8b29c UB |
175 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; |
176 | ||
0d18a0cb | 177 | /* try to send del link msg, on error free lgr immediately */ |
90d8b29c UB |
178 | if (lnk->state == SMC_LNK_ACTIVE && |
179 | !smc_link_send_delete(lnk)) { | |
0d18a0cb KG |
180 | /* reschedule in case we never receive a response */ |
181 | smc_lgr_schedule_free_work(lgr); | |
182 | return; | |
183 | } | |
184 | } | |
185 | ||
3cf52eb1 | 186 | if (!delayed_work_pending(&lgr->free_work)) { |
0d18a0cb KG |
187 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; |
188 | ||
189 | if (!lgr->is_smcd && lnk->state != SMC_LNK_INACTIVE) | |
190 | smc_llc_link_inactive(lnk); | |
0512f69e HW |
191 | if (lgr->is_smcd) |
192 | smc_ism_signal_shutdown(lgr); | |
268ffcc4 | 193 | smc_lgr_free(lgr); |
3cf52eb1 | 194 | } |
0cfdd8f9 UB |
195 | } |
196 | ||
197 | /* create a new SMC link group */ | |
bc36d2fc | 198 | static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini) |
0cfdd8f9 UB |
199 | { |
200 | struct smc_link_group *lgr; | |
201 | struct smc_link *lnk; | |
202 | u8 rndvec[3]; | |
203 | int rc = 0; | |
cd6851f3 | 204 | int i; |
0cfdd8f9 | 205 | |
bc36d2fc | 206 | if (ini->is_smcd && ini->vlan_id) { |
7a62725a KG |
207 | if (smc_ism_get_vlan(ini->ism_dev, ini->vlan_id)) { |
208 | rc = SMC_CLC_DECL_ISMVLANERR; | |
c6ba7c9b | 209 | goto out; |
7a62725a | 210 | } |
c6ba7c9b HW |
211 | } |
212 | ||
0cfdd8f9 UB |
213 | lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); |
214 | if (!lgr) { | |
7a62725a | 215 | rc = SMC_CLC_DECL_MEM; |
0cfdd8f9 UB |
216 | goto out; |
217 | } | |
bc36d2fc | 218 | lgr->is_smcd = ini->is_smcd; |
517c300e | 219 | lgr->sync_err = 0; |
bc36d2fc | 220 | lgr->vlan_id = ini->vlan_id; |
cd6851f3 UB |
221 | rwlock_init(&lgr->sndbufs_lock); |
222 | rwlock_init(&lgr->rmbs_lock); | |
c6ba7c9b | 223 | rwlock_init(&lgr->conns_lock); |
cd6851f3 UB |
224 | for (i = 0; i < SMC_RMBE_SIZES; i++) { |
225 | INIT_LIST_HEAD(&lgr->sndbufs[i]); | |
226 | INIT_LIST_HEAD(&lgr->rmbs[i]); | |
227 | } | |
9fda3510 HW |
228 | smc_lgr_list.num += SMC_LGR_NUM_INCR; |
229 | memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE); | |
0cfdd8f9 UB |
230 | INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); |
231 | lgr->conns_all = RB_ROOT; | |
bc36d2fc | 232 | if (ini->is_smcd) { |
c6ba7c9b | 233 | /* SMC-D specific settings */ |
bc36d2fc KG |
234 | lgr->peer_gid = ini->ism_gid; |
235 | lgr->smcd = ini->ism_dev; | |
c6ba7c9b HW |
236 | } else { |
237 | /* SMC-R specific settings */ | |
238 | lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; | |
bc36d2fc KG |
239 | memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer, |
240 | SMC_SYSTEMID_LEN); | |
c6ba7c9b HW |
241 | |
242 | lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
243 | /* initialize link */ | |
244 | lnk->state = SMC_LNK_ACTIVATING; | |
245 | lnk->link_id = SMC_SINGLE_LINK; | |
bc36d2fc KG |
246 | lnk->smcibdev = ini->ib_dev; |
247 | lnk->ibport = ini->ib_port; | |
248 | lnk->path_mtu = | |
249 | ini->ib_dev->pattr[ini->ib_port - 1].active_mtu; | |
250 | if (!ini->ib_dev->initialized) | |
251 | smc_ib_setup_per_ibdev(ini->ib_dev); | |
c6ba7c9b HW |
252 | get_random_bytes(rndvec, sizeof(rndvec)); |
253 | lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + | |
254 | (rndvec[2] << 16); | |
7005ada6 | 255 | rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport, |
bc36d2fc KG |
256 | ini->vlan_id, lnk->gid, |
257 | &lnk->sgid_index); | |
7005ada6 UB |
258 | if (rc) |
259 | goto free_lgr; | |
c6ba7c9b HW |
260 | rc = smc_llc_link_init(lnk); |
261 | if (rc) | |
262 | goto free_lgr; | |
263 | rc = smc_wr_alloc_link_mem(lnk); | |
264 | if (rc) | |
265 | goto clear_llc_lnk; | |
266 | rc = smc_ib_create_protection_domain(lnk); | |
267 | if (rc) | |
268 | goto free_link_mem; | |
269 | rc = smc_ib_create_queue_pair(lnk); | |
270 | if (rc) | |
271 | goto dealloc_pd; | |
272 | rc = smc_wr_create_link(lnk); | |
273 | if (rc) | |
274 | goto destroy_qp; | |
275 | } | |
0cfdd8f9 | 276 | smc->conn.lgr = lgr; |
0cfdd8f9 UB |
277 | spin_lock_bh(&smc_lgr_list.lock); |
278 | list_add(&lgr->list, &smc_lgr_list.list); | |
279 | spin_unlock_bh(&smc_lgr_list.lock); | |
f38ba179 UB |
280 | return 0; |
281 | ||
bd4ad577 UB |
282 | destroy_qp: |
283 | smc_ib_destroy_queue_pair(lnk); | |
284 | dealloc_pd: | |
285 | smc_ib_dealloc_protection_domain(lnk); | |
286 | free_link_mem: | |
287 | smc_wr_free_link_mem(lnk); | |
2a4c57a9 KG |
288 | clear_llc_lnk: |
289 | smc_llc_link_clear(lnk); | |
f38ba179 UB |
290 | free_lgr: |
291 | kfree(lgr); | |
0cfdd8f9 | 292 | out: |
7a62725a KG |
293 | if (rc < 0) { |
294 | if (rc == -ENOMEM) | |
295 | rc = SMC_CLC_DECL_MEM; | |
296 | else | |
297 | rc = SMC_CLC_DECL_INTERR; | |
298 | } | |
0cfdd8f9 UB |
299 | return rc; |
300 | } | |
301 | ||
fb692ec4 KG |
302 | static void smc_buf_unuse(struct smc_connection *conn, |
303 | struct smc_link_group *lgr) | |
cd6851f3 | 304 | { |
69cb7dc0 | 305 | if (conn->sndbuf_desc) |
cd6851f3 | 306 | conn->sndbuf_desc->used = 0; |
cd6851f3 | 307 | if (conn->rmb_desc) { |
a6920d1d | 308 | if (!conn->rmb_desc->regerr) { |
c7674c00 KG |
309 | if (!lgr->is_smcd) { |
310 | /* unregister rmb with peer */ | |
311 | smc_llc_do_delete_rkey( | |
312 | &lgr->lnk[SMC_SINGLE_LINK], | |
313 | conn->rmb_desc); | |
314 | } | |
a5e04318 | 315 | conn->rmb_desc->used = 0; |
a6920d1d KG |
316 | } else { |
317 | /* buf registration failed, reuse not possible */ | |
a6920d1d KG |
318 | write_lock_bh(&lgr->rmbs_lock); |
319 | list_del(&conn->rmb_desc->list); | |
320 | write_unlock_bh(&lgr->rmbs_lock); | |
321 | ||
6511aad3 | 322 | smc_buf_free(lgr, true, conn->rmb_desc); |
a6920d1d | 323 | } |
cd6851f3 UB |
324 | } |
325 | } | |
326 | ||
0cfdd8f9 UB |
327 | /* remove a finished connection from its link group */ |
328 | void smc_conn_free(struct smc_connection *conn) | |
329 | { | |
fb692ec4 KG |
330 | struct smc_link_group *lgr = conn->lgr; |
331 | ||
332 | if (!lgr) | |
0cfdd8f9 | 333 | return; |
fb692ec4 | 334 | if (lgr->is_smcd) { |
c6ba7c9b | 335 | smc_ism_unset_conn(conn); |
be244f28 HW |
336 | tasklet_kill(&conn->rx_tsklet); |
337 | } else { | |
c6ba7c9b | 338 | smc_cdc_tx_dismiss_slots(conn); |
be244f28 | 339 | } |
8fc002b0 | 340 | smc_lgr_unregister_conn(conn); |
fb692ec4 | 341 | smc_buf_unuse(conn, lgr); /* allow buffer reuse */ |
8fc002b0 | 342 | conn->lgr = NULL; |
fb692ec4 KG |
343 | |
344 | if (!lgr->conns_num) | |
345 | smc_lgr_schedule_free_work(lgr); | |
0cfdd8f9 UB |
346 | } |
347 | ||
348 | static void smc_link_clear(struct smc_link *lnk) | |
349 | { | |
350 | lnk->peer_qpn = 0; | |
2a4c57a9 | 351 | smc_llc_link_clear(lnk); |
bd4ad577 | 352 | smc_ib_modify_qp_reset(lnk); |
f38ba179 | 353 | smc_wr_free_link(lnk); |
bd4ad577 UB |
354 | smc_ib_destroy_queue_pair(lnk); |
355 | smc_ib_dealloc_protection_domain(lnk); | |
f38ba179 | 356 | smc_wr_free_link_mem(lnk); |
0cfdd8f9 UB |
357 | } |
358 | ||
c6ba7c9b HW |
359 | static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb, |
360 | struct smc_buf_desc *buf_desc) | |
cd6851f3 | 361 | { |
6511aad3 HW |
362 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; |
363 | ||
3e034725 UB |
364 | if (is_rmb) { |
365 | if (buf_desc->mr_rx[SMC_SINGLE_LINK]) | |
366 | smc_ib_put_memory_region( | |
367 | buf_desc->mr_rx[SMC_SINGLE_LINK]); | |
368 | smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc, | |
369 | DMA_FROM_DEVICE); | |
370 | } else { | |
371 | smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc, | |
372 | DMA_TO_DEVICE); | |
cd6851f3 | 373 | } |
3e034725 | 374 | sg_free_table(&buf_desc->sgt[SMC_SINGLE_LINK]); |
2ef4f27a SR |
375 | if (buf_desc->pages) |
376 | __free_pages(buf_desc->pages, buf_desc->order); | |
3e034725 | 377 | kfree(buf_desc); |
cd6851f3 UB |
378 | } |
379 | ||
c6ba7c9b HW |
380 | static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb, |
381 | struct smc_buf_desc *buf_desc) | |
382 | { | |
be244f28 HW |
383 | if (is_dmb) { |
384 | /* restore original buf len */ | |
385 | buf_desc->len += sizeof(struct smcd_cdc_msg); | |
c6ba7c9b | 386 | smc_ism_unregister_dmb(lgr->smcd, buf_desc); |
be244f28 | 387 | } else { |
c6ba7c9b | 388 | kfree(buf_desc->cpu_addr); |
be244f28 | 389 | } |
c6ba7c9b HW |
390 | kfree(buf_desc); |
391 | } | |
392 | ||
393 | static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb, | |
394 | struct smc_buf_desc *buf_desc) | |
395 | { | |
396 | if (lgr->is_smcd) | |
397 | smcd_buf_free(lgr, is_rmb, buf_desc); | |
398 | else | |
399 | smcr_buf_free(lgr, is_rmb, buf_desc); | |
400 | } | |
401 | ||
3e034725 | 402 | static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) |
cd6851f3 | 403 | { |
3e034725 UB |
404 | struct smc_buf_desc *buf_desc, *bf_desc; |
405 | struct list_head *buf_list; | |
cd6851f3 UB |
406 | int i; |
407 | ||
408 | for (i = 0; i < SMC_RMBE_SIZES; i++) { | |
3e034725 UB |
409 | if (is_rmb) |
410 | buf_list = &lgr->rmbs[i]; | |
411 | else | |
412 | buf_list = &lgr->sndbufs[i]; | |
413 | list_for_each_entry_safe(buf_desc, bf_desc, buf_list, | |
cd6851f3 | 414 | list) { |
3e034725 | 415 | list_del(&buf_desc->list); |
6511aad3 | 416 | smc_buf_free(lgr, is_rmb, buf_desc); |
cd6851f3 UB |
417 | } |
418 | } | |
419 | } | |
420 | ||
3e034725 UB |
421 | static void smc_lgr_free_bufs(struct smc_link_group *lgr) |
422 | { | |
423 | /* free send buffers */ | |
424 | __smc_lgr_free_bufs(lgr, false); | |
425 | /* free rmbs */ | |
426 | __smc_lgr_free_bufs(lgr, true); | |
427 | } | |
428 | ||
0cfdd8f9 | 429 | /* remove a link group */ |
3f3f0e36 | 430 | static void smc_lgr_free(struct smc_link_group *lgr) |
0cfdd8f9 | 431 | { |
3e034725 | 432 | smc_lgr_free_bufs(lgr); |
c6ba7c9b HW |
433 | if (lgr->is_smcd) |
434 | smc_ism_put_vlan(lgr->smcd, lgr->vlan_id); | |
435 | else | |
436 | smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]); | |
0cfdd8f9 UB |
437 | kfree(lgr); |
438 | } | |
439 | ||
9651b934 KG |
440 | void smc_lgr_forget(struct smc_link_group *lgr) |
441 | { | |
442 | spin_lock_bh(&smc_lgr_list.lock); | |
443 | /* do not use this link group for new connections */ | |
444 | if (!list_empty(&lgr->list)) | |
445 | list_del_init(&lgr->list); | |
446 | spin_unlock_bh(&smc_lgr_list.lock); | |
447 | } | |
448 | ||
0cfdd8f9 | 449 | /* terminate linkgroup abnormally */ |
b9f227c3 | 450 | static void __smc_lgr_terminate(struct smc_link_group *lgr) |
0cfdd8f9 UB |
451 | { |
452 | struct smc_connection *conn; | |
b38d7324 | 453 | struct smc_sock *smc; |
0cfdd8f9 UB |
454 | struct rb_node *node; |
455 | ||
517c300e KG |
456 | if (lgr->terminating) |
457 | return; /* lgr already terminating */ | |
458 | lgr->terminating = 1; | |
b9f227c3 HW |
459 | if (!list_empty(&lgr->list)) /* forget lgr */ |
460 | list_del_init(&lgr->list); | |
c6ba7c9b HW |
461 | if (!lgr->is_smcd) |
462 | smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]); | |
0cfdd8f9 UB |
463 | |
464 | write_lock_bh(&lgr->conns_lock); | |
465 | node = rb_first(&lgr->conns_all); | |
466 | while (node) { | |
467 | conn = rb_entry(node, struct smc_connection, alert_node); | |
b38d7324 | 468 | smc = container_of(conn, struct smc_sock, conn); |
51f1de79 | 469 | sock_hold(&smc->sk); /* sock_put in close work */ |
732720fa | 470 | conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1; |
0cfdd8f9 | 471 | __smc_lgr_unregister_conn(conn); |
8fc002b0 | 472 | conn->lgr = NULL; |
732720fa | 473 | write_unlock_bh(&lgr->conns_lock); |
51f1de79 UB |
474 | if (!schedule_work(&conn->close_work)) |
475 | sock_put(&smc->sk); | |
732720fa | 476 | write_lock_bh(&lgr->conns_lock); |
0cfdd8f9 UB |
477 | node = rb_first(&lgr->conns_all); |
478 | } | |
479 | write_unlock_bh(&lgr->conns_lock); | |
c6ba7c9b HW |
480 | if (!lgr->is_smcd) |
481 | wake_up(&lgr->lnk[SMC_SINGLE_LINK].wr_reg_wait); | |
97cdbc42 | 482 | smc_lgr_schedule_free_work(lgr); |
0cfdd8f9 UB |
483 | } |
484 | ||
b9f227c3 HW |
485 | void smc_lgr_terminate(struct smc_link_group *lgr) |
486 | { | |
487 | spin_lock_bh(&smc_lgr_list.lock); | |
488 | __smc_lgr_terminate(lgr); | |
489 | spin_unlock_bh(&smc_lgr_list.lock); | |
490 | } | |
491 | ||
9fda3510 HW |
492 | /* Called when IB port is terminated */ |
493 | void smc_port_terminate(struct smc_ib_device *smcibdev, u8 ibport) | |
494 | { | |
495 | struct smc_link_group *lgr, *l; | |
496 | ||
b9f227c3 | 497 | spin_lock_bh(&smc_lgr_list.lock); |
9fda3510 | 498 | list_for_each_entry_safe(lgr, l, &smc_lgr_list.list, list) { |
c6ba7c9b HW |
499 | if (!lgr->is_smcd && |
500 | lgr->lnk[SMC_SINGLE_LINK].smcibdev == smcibdev && | |
9fda3510 | 501 | lgr->lnk[SMC_SINGLE_LINK].ibport == ibport) |
b9f227c3 | 502 | __smc_lgr_terminate(lgr); |
9fda3510 | 503 | } |
b9f227c3 | 504 | spin_unlock_bh(&smc_lgr_list.lock); |
9fda3510 HW |
505 | } |
506 | ||
c6ba7c9b | 507 | /* Called when SMC-D device is terminated or peer is lost */ |
0512f69e | 508 | void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan) |
c6ba7c9b HW |
509 | { |
510 | struct smc_link_group *lgr, *l; | |
511 | LIST_HEAD(lgr_free_list); | |
512 | ||
513 | /* run common cleanup function and build free list */ | |
514 | spin_lock_bh(&smc_lgr_list.lock); | |
515 | list_for_each_entry_safe(lgr, l, &smc_lgr_list.list, list) { | |
516 | if (lgr->is_smcd && lgr->smcd == dev && | |
517 | (!peer_gid || lgr->peer_gid == peer_gid) && | |
0512f69e | 518 | (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) { |
c6ba7c9b HW |
519 | __smc_lgr_terminate(lgr); |
520 | list_move(&lgr->list, &lgr_free_list); | |
521 | } | |
522 | } | |
523 | spin_unlock_bh(&smc_lgr_list.lock); | |
524 | ||
525 | /* cancel the regular free workers and actually free lgrs */ | |
526 | list_for_each_entry_safe(lgr, l, &lgr_free_list, list) { | |
527 | list_del_init(&lgr->list); | |
528 | cancel_delayed_work_sync(&lgr->free_work); | |
0512f69e HW |
529 | if (!peer_gid && vlan == VLAN_VID_MASK) /* dev terminated? */ |
530 | smc_ism_signal_shutdown(lgr); | |
c6ba7c9b HW |
531 | smc_lgr_free(lgr); |
532 | } | |
533 | } | |
534 | ||
0cfdd8f9 UB |
535 | /* Determine vlan of internal TCP socket. |
536 | * @vlan_id: address to store the determined vlan id into | |
537 | */ | |
bc36d2fc | 538 | int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini) |
0cfdd8f9 UB |
539 | { |
540 | struct dst_entry *dst = sk_dst_get(clcsock->sk); | |
cb9d43f6 UB |
541 | struct net_device *ndev; |
542 | int i, nest_lvl, rc = 0; | |
0cfdd8f9 | 543 | |
bc36d2fc | 544 | ini->vlan_id = 0; |
0cfdd8f9 UB |
545 | if (!dst) { |
546 | rc = -ENOTCONN; | |
547 | goto out; | |
548 | } | |
549 | if (!dst->dev) { | |
550 | rc = -ENODEV; | |
551 | goto out_rel; | |
552 | } | |
553 | ||
cb9d43f6 UB |
554 | ndev = dst->dev; |
555 | if (is_vlan_dev(ndev)) { | |
bc36d2fc | 556 | ini->vlan_id = vlan_dev_vlan_id(ndev); |
cb9d43f6 UB |
557 | goto out_rel; |
558 | } | |
559 | ||
560 | rtnl_lock(); | |
561 | nest_lvl = dev_get_nest_level(ndev); | |
562 | for (i = 0; i < nest_lvl; i++) { | |
563 | struct list_head *lower = &ndev->adj_list.lower; | |
564 | ||
565 | if (list_empty(lower)) | |
566 | break; | |
567 | lower = lower->next; | |
568 | ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower); | |
569 | if (is_vlan_dev(ndev)) { | |
bc36d2fc | 570 | ini->vlan_id = vlan_dev_vlan_id(ndev); |
cb9d43f6 UB |
571 | break; |
572 | } | |
573 | } | |
574 | rtnl_unlock(); | |
0cfdd8f9 UB |
575 | |
576 | out_rel: | |
577 | dst_release(dst); | |
578 | out: | |
579 | return rc; | |
580 | } | |
581 | ||
c6ba7c9b HW |
582 | static bool smcr_lgr_match(struct smc_link_group *lgr, |
583 | struct smc_clc_msg_local *lcl, | |
ee05ff7a | 584 | enum smc_lgr_role role, u32 clcqpn) |
0cfdd8f9 | 585 | { |
c6ba7c9b HW |
586 | return !memcmp(lgr->peer_systemid, lcl->id_for_peer, |
587 | SMC_SYSTEMID_LEN) && | |
588 | !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid, | |
589 | SMC_GID_SIZE) && | |
590 | !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac, | |
591 | sizeof(lcl->mac)) && | |
ee05ff7a KG |
592 | lgr->role == role && |
593 | (lgr->role == SMC_SERV || | |
594 | lgr->lnk[SMC_SINGLE_LINK].peer_qpn == clcqpn); | |
c6ba7c9b | 595 | } |
0cfdd8f9 | 596 | |
c6ba7c9b HW |
597 | static bool smcd_lgr_match(struct smc_link_group *lgr, |
598 | struct smcd_dev *smcismdev, u64 peer_gid) | |
599 | { | |
600 | return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev; | |
0cfdd8f9 UB |
601 | } |
602 | ||
603 | /* create a new SMC connection (and a new link group if necessary) */ | |
bc36d2fc | 604 | int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini) |
0cfdd8f9 UB |
605 | { |
606 | struct smc_connection *conn = &smc->conn; | |
607 | struct smc_link_group *lgr; | |
0cfdd8f9 | 608 | enum smc_lgr_role role; |
0cfdd8f9 UB |
609 | int rc = 0; |
610 | ||
7a62725a | 611 | ini->cln_first_contact = SMC_FIRST_CONTACT; |
0cfdd8f9 | 612 | role = smc->listen_smc ? SMC_SERV : SMC_CLNT; |
bc36d2fc | 613 | if (role == SMC_CLNT && ini->srv_first_contact) |
0cfdd8f9 UB |
614 | /* create new link group as well */ |
615 | goto create; | |
616 | ||
617 | /* determine if an existing link group can be reused */ | |
618 | spin_lock_bh(&smc_lgr_list.lock); | |
619 | list_for_each_entry(lgr, &smc_lgr_list.list, list) { | |
620 | write_lock_bh(&lgr->conns_lock); | |
bc36d2fc KG |
621 | if ((ini->is_smcd ? |
622 | smcd_lgr_match(lgr, ini->ism_dev, ini->ism_gid) : | |
623 | smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) && | |
0cfdd8f9 | 624 | !lgr->sync_err && |
bc36d2fc | 625 | lgr->vlan_id == ini->vlan_id && |
c6ba7c9b HW |
626 | (role == SMC_CLNT || |
627 | lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) { | |
0cfdd8f9 | 628 | /* link group found */ |
7a62725a | 629 | ini->cln_first_contact = SMC_REUSE_CONTACT; |
0cfdd8f9 UB |
630 | conn->lgr = lgr; |
631 | smc_lgr_register_conn(conn); /* add smc conn to lgr */ | |
77f838ac KG |
632 | if (delayed_work_pending(&lgr->free_work)) |
633 | cancel_delayed_work(&lgr->free_work); | |
0cfdd8f9 UB |
634 | write_unlock_bh(&lgr->conns_lock); |
635 | break; | |
636 | } | |
637 | write_unlock_bh(&lgr->conns_lock); | |
638 | } | |
639 | spin_unlock_bh(&smc_lgr_list.lock); | |
640 | ||
bc36d2fc | 641 | if (role == SMC_CLNT && !ini->srv_first_contact && |
7a62725a | 642 | ini->cln_first_contact == SMC_FIRST_CONTACT) { |
0cfdd8f9 UB |
643 | /* Server reuses a link group, but Client wants to start |
644 | * a new one | |
645 | * send out_of_sync decline, reason synchr. error | |
646 | */ | |
7a62725a | 647 | return SMC_CLC_DECL_SYNCERR; |
0cfdd8f9 UB |
648 | } |
649 | ||
650 | create: | |
7a62725a | 651 | if (ini->cln_first_contact == SMC_FIRST_CONTACT) { |
bc36d2fc | 652 | rc = smc_lgr_create(smc, ini); |
0cfdd8f9 UB |
653 | if (rc) |
654 | goto out; | |
44808792 HZ |
655 | lgr = conn->lgr; |
656 | write_lock_bh(&lgr->conns_lock); | |
0cfdd8f9 | 657 | smc_lgr_register_conn(conn); /* add smc conn to lgr */ |
44808792 | 658 | write_unlock_bh(&lgr->conns_lock); |
0cfdd8f9 | 659 | } |
5f08318f | 660 | conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; |
cbba07a7 | 661 | conn->local_tx_ctrl.len = SMC_WR_TX_SIZE; |
de8474eb | 662 | conn->urg_state = SMC_URG_READ; |
bc36d2fc | 663 | if (ini->is_smcd) { |
be244f28 HW |
664 | conn->rx_off = sizeof(struct smcd_cdc_msg); |
665 | smcd_cdc_rx_init(conn); /* init tasklet for this conn */ | |
666 | } | |
5f08318f UB |
667 | #ifndef KERNEL_HAS_ATOMIC64 |
668 | spin_lock_init(&conn->acurs_lock); | |
669 | #endif | |
0cfdd8f9 UB |
670 | |
671 | out: | |
7a62725a | 672 | return rc; |
0cfdd8f9 | 673 | } |
cd6851f3 | 674 | |
2f6becaf HW |
675 | /* convert the RMB size into the compressed notation - minimum 16K. |
676 | * In contrast to plain ilog2, this rounds towards the next power of 2, | |
677 | * so the socket application gets at least its desired sndbuf / rcvbuf size. | |
678 | */ | |
679 | static u8 smc_compress_bufsize(int size) | |
680 | { | |
681 | u8 compressed; | |
682 | ||
683 | if (size <= SMC_BUF_MIN_SIZE) | |
684 | return 0; | |
685 | ||
686 | size = (size - 1) >> 14; | |
687 | compressed = ilog2(size) + 1; | |
688 | if (compressed >= SMC_RMBE_SIZES) | |
689 | compressed = SMC_RMBE_SIZES - 1; | |
690 | return compressed; | |
691 | } | |
692 | ||
693 | /* convert the RMB size from compressed notation into integer */ | |
694 | int smc_uncompress_bufsize(u8 compressed) | |
695 | { | |
696 | u32 size; | |
697 | ||
698 | size = 0x00000001 << (((int)compressed) + 14); | |
699 | return (int)size; | |
700 | } | |
701 | ||
3e034725 UB |
702 | /* try to reuse a sndbuf or rmb description slot for a certain |
703 | * buffer size; if not available, return NULL | |
cd6851f3 | 704 | */ |
8437bda0 HW |
705 | static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize, |
706 | rwlock_t *lock, | |
707 | struct list_head *buf_list) | |
cd6851f3 | 708 | { |
3e034725 | 709 | struct smc_buf_desc *buf_slot; |
cd6851f3 | 710 | |
3e034725 UB |
711 | read_lock_bh(lock); |
712 | list_for_each_entry(buf_slot, buf_list, list) { | |
713 | if (cmpxchg(&buf_slot->used, 0, 1) == 0) { | |
714 | read_unlock_bh(lock); | |
715 | return buf_slot; | |
cd6851f3 UB |
716 | } |
717 | } | |
3e034725 | 718 | read_unlock_bh(lock); |
cd6851f3 UB |
719 | return NULL; |
720 | } | |
721 | ||
952310cc UB |
722 | /* one of the conditions for announcing a receiver's current window size is |
723 | * that it "results in a minimum increase in the window size of 10% of the | |
724 | * receive buffer space" [RFC7609] | |
725 | */ | |
726 | static inline int smc_rmb_wnd_update_limit(int rmbe_size) | |
727 | { | |
728 | return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); | |
729 | } | |
730 | ||
c6ba7c9b HW |
731 | static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr, |
732 | bool is_rmb, int bufsize) | |
b33982c3 UB |
733 | { |
734 | struct smc_buf_desc *buf_desc; | |
735 | struct smc_link *lnk; | |
736 | int rc; | |
737 | ||
738 | /* try to alloc a new buffer */ | |
739 | buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); | |
740 | if (!buf_desc) | |
741 | return ERR_PTR(-ENOMEM); | |
742 | ||
2ef4f27a SR |
743 | buf_desc->order = get_order(bufsize); |
744 | buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN | | |
745 | __GFP_NOMEMALLOC | __GFP_COMP | | |
746 | __GFP_NORETRY | __GFP_ZERO, | |
747 | buf_desc->order); | |
748 | if (!buf_desc->pages) { | |
b33982c3 UB |
749 | kfree(buf_desc); |
750 | return ERR_PTR(-EAGAIN); | |
751 | } | |
2ef4f27a | 752 | buf_desc->cpu_addr = (void *)page_address(buf_desc->pages); |
b33982c3 UB |
753 | |
754 | /* build the sg table from the pages */ | |
755 | lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
756 | rc = sg_alloc_table(&buf_desc->sgt[SMC_SINGLE_LINK], 1, | |
757 | GFP_KERNEL); | |
758 | if (rc) { | |
6511aad3 | 759 | smc_buf_free(lgr, is_rmb, buf_desc); |
b33982c3 UB |
760 | return ERR_PTR(rc); |
761 | } | |
762 | sg_set_buf(buf_desc->sgt[SMC_SINGLE_LINK].sgl, | |
763 | buf_desc->cpu_addr, bufsize); | |
764 | ||
765 | /* map sg table to DMA address */ | |
766 | rc = smc_ib_buf_map_sg(lnk->smcibdev, buf_desc, | |
767 | is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
768 | /* SMC protocol depends on mapping to one DMA address only */ | |
769 | if (rc != 1) { | |
6511aad3 | 770 | smc_buf_free(lgr, is_rmb, buf_desc); |
b33982c3 UB |
771 | return ERR_PTR(-EAGAIN); |
772 | } | |
773 | ||
774 | /* create a new memory region for the RMB */ | |
775 | if (is_rmb) { | |
776 | rc = smc_ib_get_memory_region(lnk->roce_pd, | |
777 | IB_ACCESS_REMOTE_WRITE | | |
778 | IB_ACCESS_LOCAL_WRITE, | |
779 | buf_desc); | |
780 | if (rc) { | |
6511aad3 | 781 | smc_buf_free(lgr, is_rmb, buf_desc); |
b33982c3 UB |
782 | return ERR_PTR(rc); |
783 | } | |
784 | } | |
785 | ||
69cb7dc0 | 786 | buf_desc->len = bufsize; |
b33982c3 UB |
787 | return buf_desc; |
788 | } | |
789 | ||
c6ba7c9b HW |
790 | #define SMCD_DMBE_SIZES 7 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */ |
791 | ||
792 | static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr, | |
793 | bool is_dmb, int bufsize) | |
794 | { | |
795 | struct smc_buf_desc *buf_desc; | |
796 | int rc; | |
797 | ||
798 | if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES) | |
799 | return ERR_PTR(-EAGAIN); | |
800 | ||
801 | /* try to alloc a new DMB */ | |
802 | buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); | |
803 | if (!buf_desc) | |
804 | return ERR_PTR(-ENOMEM); | |
805 | if (is_dmb) { | |
806 | rc = smc_ism_register_dmb(lgr, bufsize, buf_desc); | |
807 | if (rc) { | |
808 | kfree(buf_desc); | |
809 | return ERR_PTR(-EAGAIN); | |
810 | } | |
be244f28 HW |
811 | buf_desc->pages = virt_to_page(buf_desc->cpu_addr); |
812 | /* CDC header stored in buf. So, pretend it was smaller */ | |
813 | buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg); | |
c6ba7c9b HW |
814 | } else { |
815 | buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL | | |
816 | __GFP_NOWARN | __GFP_NORETRY | | |
817 | __GFP_NOMEMALLOC); | |
818 | if (!buf_desc->cpu_addr) { | |
819 | kfree(buf_desc); | |
820 | return ERR_PTR(-EAGAIN); | |
821 | } | |
822 | buf_desc->len = bufsize; | |
823 | } | |
824 | return buf_desc; | |
825 | } | |
826 | ||
827 | static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb) | |
cd6851f3 | 828 | { |
8437bda0 | 829 | struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM); |
cd6851f3 UB |
830 | struct smc_connection *conn = &smc->conn; |
831 | struct smc_link_group *lgr = conn->lgr; | |
3e034725 | 832 | struct list_head *buf_list; |
c45abf31 | 833 | int bufsize, bufsize_short; |
3e034725 UB |
834 | int sk_buf_size; |
835 | rwlock_t *lock; | |
cd6851f3 | 836 | |
3e034725 UB |
837 | if (is_rmb) |
838 | /* use socket recv buffer size (w/o overhead) as start value */ | |
839 | sk_buf_size = smc->sk.sk_rcvbuf / 2; | |
840 | else | |
841 | /* use socket send buffer size (w/o overhead) as start value */ | |
842 | sk_buf_size = smc->sk.sk_sndbuf / 2; | |
843 | ||
4e1061f4 | 844 | for (bufsize_short = smc_compress_bufsize(sk_buf_size); |
c45abf31 | 845 | bufsize_short >= 0; bufsize_short--) { |
9d8fb617 | 846 | |
3e034725 UB |
847 | if (is_rmb) { |
848 | lock = &lgr->rmbs_lock; | |
849 | buf_list = &lgr->rmbs[bufsize_short]; | |
850 | } else { | |
851 | lock = &lgr->sndbufs_lock; | |
852 | buf_list = &lgr->sndbufs[bufsize_short]; | |
9d8fb617 | 853 | } |
c45abf31 | 854 | bufsize = smc_uncompress_bufsize(bufsize_short); |
a3fe3d01 UB |
855 | if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC) |
856 | continue; | |
857 | ||
3e034725 | 858 | /* check for reusable slot in the link group */ |
8437bda0 | 859 | buf_desc = smc_buf_get_slot(bufsize_short, lock, buf_list); |
3e034725 UB |
860 | if (buf_desc) { |
861 | memset(buf_desc->cpu_addr, 0, bufsize); | |
cd6851f3 UB |
862 | break; /* found reusable slot */ |
863 | } | |
a3fe3d01 | 864 | |
c6ba7c9b HW |
865 | if (is_smcd) |
866 | buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize); | |
867 | else | |
868 | buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize); | |
869 | ||
b33982c3 UB |
870 | if (PTR_ERR(buf_desc) == -ENOMEM) |
871 | break; | |
872 | if (IS_ERR(buf_desc)) | |
a3fe3d01 | 873 | continue; |
897e1c24 | 874 | |
3e034725 UB |
875 | buf_desc->used = 1; |
876 | write_lock_bh(lock); | |
877 | list_add(&buf_desc->list, buf_list); | |
878 | write_unlock_bh(lock); | |
879 | break; /* found */ | |
cd6851f3 | 880 | } |
3e034725 | 881 | |
b33982c3 | 882 | if (IS_ERR(buf_desc)) |
3e034725 UB |
883 | return -ENOMEM; |
884 | ||
885 | if (is_rmb) { | |
886 | conn->rmb_desc = buf_desc; | |
c45abf31 UB |
887 | conn->rmbe_size_short = bufsize_short; |
888 | smc->sk.sk_rcvbuf = bufsize * 2; | |
5f08318f | 889 | atomic_set(&conn->bytes_to_rcv, 0); |
be244f28 HW |
890 | conn->rmbe_update_limit = |
891 | smc_rmb_wnd_update_limit(buf_desc->len); | |
c6ba7c9b HW |
892 | if (is_smcd) |
893 | smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */ | |
cd6851f3 | 894 | } else { |
3e034725 | 895 | conn->sndbuf_desc = buf_desc; |
3e034725 UB |
896 | smc->sk.sk_sndbuf = bufsize * 2; |
897 | atomic_set(&conn->sndbuf_space, bufsize); | |
cd6851f3 | 898 | } |
3e034725 UB |
899 | return 0; |
900 | } | |
901 | ||
10428dd8 UB |
902 | void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn) |
903 | { | |
904 | struct smc_link_group *lgr = conn->lgr; | |
905 | ||
c6ba7c9b HW |
906 | if (!conn->lgr || conn->lgr->is_smcd) |
907 | return; | |
10428dd8 UB |
908 | smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev, |
909 | conn->sndbuf_desc, DMA_TO_DEVICE); | |
910 | } | |
911 | ||
912 | void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) | |
913 | { | |
914 | struct smc_link_group *lgr = conn->lgr; | |
915 | ||
c6ba7c9b HW |
916 | if (!conn->lgr || conn->lgr->is_smcd) |
917 | return; | |
10428dd8 UB |
918 | smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev, |
919 | conn->sndbuf_desc, DMA_TO_DEVICE); | |
920 | } | |
921 | ||
922 | void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) | |
923 | { | |
924 | struct smc_link_group *lgr = conn->lgr; | |
925 | ||
c6ba7c9b HW |
926 | if (!conn->lgr || conn->lgr->is_smcd) |
927 | return; | |
10428dd8 UB |
928 | smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev, |
929 | conn->rmb_desc, DMA_FROM_DEVICE); | |
930 | } | |
931 | ||
932 | void smc_rmb_sync_sg_for_device(struct smc_connection *conn) | |
933 | { | |
934 | struct smc_link_group *lgr = conn->lgr; | |
935 | ||
c6ba7c9b HW |
936 | if (!conn->lgr || conn->lgr->is_smcd) |
937 | return; | |
10428dd8 UB |
938 | smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev, |
939 | conn->rmb_desc, DMA_FROM_DEVICE); | |
940 | } | |
941 | ||
3e034725 UB |
942 | /* create the send and receive buffer for an SMC socket; |
943 | * receive buffers are called RMBs; | |
944 | * (even though the SMC protocol allows more than one RMB-element per RMB, | |
945 | * the Linux implementation uses just one RMB-element per RMB, i.e. uses an | |
946 | * extra RMB for every connection in a link group | |
947 | */ | |
c6ba7c9b | 948 | int smc_buf_create(struct smc_sock *smc, bool is_smcd) |
3e034725 UB |
949 | { |
950 | int rc; | |
951 | ||
952 | /* create send buffer */ | |
c6ba7c9b | 953 | rc = __smc_buf_create(smc, is_smcd, false); |
3e034725 UB |
954 | if (rc) |
955 | return rc; | |
956 | /* create rmb */ | |
c6ba7c9b | 957 | rc = __smc_buf_create(smc, is_smcd, true); |
3e034725 | 958 | if (rc) |
6511aad3 | 959 | smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc); |
3e034725 | 960 | return rc; |
cd6851f3 | 961 | } |
bd4ad577 UB |
962 | |
963 | static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) | |
964 | { | |
965 | int i; | |
966 | ||
967 | for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { | |
968 | if (!test_and_set_bit(i, lgr->rtokens_used_mask)) | |
969 | return i; | |
970 | } | |
971 | return -ENOSPC; | |
972 | } | |
973 | ||
4ed75de5 KG |
974 | /* add a new rtoken from peer */ |
975 | int smc_rtoken_add(struct smc_link_group *lgr, __be64 nw_vaddr, __be32 nw_rkey) | |
bd4ad577 | 976 | { |
4ed75de5 KG |
977 | u64 dma_addr = be64_to_cpu(nw_vaddr); |
978 | u32 rkey = ntohl(nw_rkey); | |
bd4ad577 UB |
979 | int i; |
980 | ||
981 | for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { | |
982 | if ((lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey) && | |
263eec9b | 983 | (lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr == dma_addr) && |
bd4ad577 | 984 | test_bit(i, lgr->rtokens_used_mask)) { |
4ed75de5 KG |
985 | /* already in list */ |
986 | return i; | |
987 | } | |
988 | } | |
989 | i = smc_rmb_reserve_rtoken_idx(lgr); | |
990 | if (i < 0) | |
991 | return i; | |
992 | lgr->rtokens[i][SMC_SINGLE_LINK].rkey = rkey; | |
993 | lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr = dma_addr; | |
994 | return i; | |
995 | } | |
996 | ||
997 | /* delete an rtoken */ | |
998 | int smc_rtoken_delete(struct smc_link_group *lgr, __be32 nw_rkey) | |
999 | { | |
1000 | u32 rkey = ntohl(nw_rkey); | |
1001 | int i; | |
1002 | ||
1003 | for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { | |
1004 | if (lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey && | |
1005 | test_bit(i, lgr->rtokens_used_mask)) { | |
1006 | lgr->rtokens[i][SMC_SINGLE_LINK].rkey = 0; | |
1007 | lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr = 0; | |
1008 | ||
1009 | clear_bit(i, lgr->rtokens_used_mask); | |
bd4ad577 UB |
1010 | return 0; |
1011 | } | |
1012 | } | |
4ed75de5 KG |
1013 | return -ENOENT; |
1014 | } | |
1015 | ||
1016 | /* save rkey and dma_addr received from peer during clc handshake */ | |
1017 | int smc_rmb_rtoken_handling(struct smc_connection *conn, | |
1018 | struct smc_clc_msg_accept_confirm *clc) | |
1019 | { | |
1020 | conn->rtoken_idx = smc_rtoken_add(conn->lgr, clc->rmb_dma_addr, | |
1021 | clc->rmb_rkey); | |
bd4ad577 UB |
1022 | if (conn->rtoken_idx < 0) |
1023 | return conn->rtoken_idx; | |
bd4ad577 UB |
1024 | return 0; |
1025 | } | |
9fda3510 HW |
1026 | |
1027 | /* Called (from smc_exit) when module is removed */ | |
1028 | void smc_core_exit(void) | |
1029 | { | |
1030 | struct smc_link_group *lgr, *lg; | |
1031 | LIST_HEAD(lgr_freeing_list); | |
1032 | ||
1033 | spin_lock_bh(&smc_lgr_list.lock); | |
1034 | if (!list_empty(&smc_lgr_list.list)) | |
1035 | list_splice_init(&smc_lgr_list.list, &lgr_freeing_list); | |
1036 | spin_unlock_bh(&smc_lgr_list.lock); | |
1037 | list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) { | |
1038 | list_del_init(&lgr->list); | |
0d18a0cb KG |
1039 | if (!lgr->is_smcd) { |
1040 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
1041 | ||
1042 | if (lnk->state == SMC_LNK_ACTIVE) | |
1043 | smc_llc_send_delete_link(lnk, SMC_LLC_REQ, | |
1044 | false); | |
1045 | smc_llc_link_inactive(lnk); | |
1046 | } | |
9fda3510 | 1047 | cancel_delayed_work_sync(&lgr->free_work); |
0512f69e HW |
1048 | if (lgr->is_smcd) |
1049 | smc_ism_signal_shutdown(lgr); | |
9fda3510 HW |
1050 | smc_lgr_free(lgr); /* free link group */ |
1051 | } | |
1052 | } |