Commit | Line | Data |
---|---|---|
0cfdd8f9 UB |
1 | /* |
2 | * Shared Memory Communications over RDMA (SMC-R) and RoCE | |
3 | * | |
4 | * Basic Transport Functions exploiting Infiniband API | |
5 | * | |
6 | * Copyright IBM Corp. 2016 | |
7 | * | |
8 | * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> | |
9 | */ | |
10 | ||
11 | #include <linux/socket.h> | |
12 | #include <linux/if_vlan.h> | |
13 | #include <linux/random.h> | |
14 | #include <linux/workqueue.h> | |
15 | #include <net/tcp.h> | |
16 | #include <net/sock.h> | |
17 | #include <rdma/ib_verbs.h> | |
18 | ||
19 | #include "smc.h" | |
20 | #include "smc_clc.h" | |
21 | #include "smc_core.h" | |
22 | #include "smc_ib.h" | |
f38ba179 | 23 | #include "smc_wr.h" |
9bf9abea | 24 | #include "smc_llc.h" |
5f08318f | 25 | #include "smc_cdc.h" |
b38d7324 | 26 | #include "smc_close.h" |
0cfdd8f9 | 27 | |
9bf9abea | 28 | #define SMC_LGR_NUM_INCR 256 |
0cfdd8f9 UB |
29 | #define SMC_LGR_FREE_DELAY (600 * HZ) |
30 | ||
9bf9abea UB |
31 | static u32 smc_lgr_num; /* unique link group number */ |
32 | ||
0cfdd8f9 UB |
33 | /* Register connection's alert token in our lookup structure. |
34 | * To use rbtrees we have to implement our own insert core. | |
35 | * Requires @conns_lock | |
36 | * @smc connection to register | |
37 | * Returns 0 on success, != otherwise. | |
38 | */ | |
39 | static void smc_lgr_add_alert_token(struct smc_connection *conn) | |
40 | { | |
41 | struct rb_node **link, *parent = NULL; | |
42 | u32 token = conn->alert_token_local; | |
43 | ||
44 | link = &conn->lgr->conns_all.rb_node; | |
45 | while (*link) { | |
46 | struct smc_connection *cur = rb_entry(*link, | |
47 | struct smc_connection, alert_node); | |
48 | ||
49 | parent = *link; | |
50 | if (cur->alert_token_local > token) | |
51 | link = &parent->rb_left; | |
52 | else | |
53 | link = &parent->rb_right; | |
54 | } | |
55 | /* Put the new node there */ | |
56 | rb_link_node(&conn->alert_node, parent, link); | |
57 | rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); | |
58 | } | |
59 | ||
60 | /* Register connection in link group by assigning an alert token | |
61 | * registered in a search tree. | |
62 | * Requires @conns_lock | |
63 | * Note that '0' is a reserved value and not assigned. | |
64 | */ | |
65 | static void smc_lgr_register_conn(struct smc_connection *conn) | |
66 | { | |
67 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
68 | static atomic_t nexttoken = ATOMIC_INIT(0); | |
69 | ||
70 | /* find a new alert_token_local value not yet used by some connection | |
71 | * in this link group | |
72 | */ | |
73 | sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ | |
74 | while (!conn->alert_token_local) { | |
75 | conn->alert_token_local = atomic_inc_return(&nexttoken); | |
76 | if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) | |
77 | conn->alert_token_local = 0; | |
78 | } | |
79 | smc_lgr_add_alert_token(conn); | |
80 | conn->lgr->conns_num++; | |
81 | } | |
82 | ||
83 | /* Unregister connection and reset the alert token of the given connection< | |
84 | */ | |
85 | static void __smc_lgr_unregister_conn(struct smc_connection *conn) | |
86 | { | |
87 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
88 | struct smc_link_group *lgr = conn->lgr; | |
89 | ||
90 | rb_erase(&conn->alert_node, &lgr->conns_all); | |
91 | lgr->conns_num--; | |
92 | conn->alert_token_local = 0; | |
93 | conn->lgr = NULL; | |
94 | sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ | |
95 | } | |
96 | ||
97 | /* Unregister connection and trigger lgr freeing if applicable | |
98 | */ | |
99 | static void smc_lgr_unregister_conn(struct smc_connection *conn) | |
100 | { | |
101 | struct smc_link_group *lgr = conn->lgr; | |
102 | int reduced = 0; | |
103 | ||
104 | write_lock_bh(&lgr->conns_lock); | |
105 | if (conn->alert_token_local) { | |
106 | reduced = 1; | |
107 | __smc_lgr_unregister_conn(conn); | |
108 | } | |
109 | write_unlock_bh(&lgr->conns_lock); | |
110 | if (reduced && !lgr->conns_num) | |
111 | schedule_delayed_work(&lgr->free_work, SMC_LGR_FREE_DELAY); | |
112 | } | |
113 | ||
114 | static void smc_lgr_free_work(struct work_struct *work) | |
115 | { | |
116 | struct smc_link_group *lgr = container_of(to_delayed_work(work), | |
117 | struct smc_link_group, | |
118 | free_work); | |
119 | bool conns; | |
120 | ||
121 | spin_lock_bh(&smc_lgr_list.lock); | |
122 | read_lock_bh(&lgr->conns_lock); | |
123 | conns = RB_EMPTY_ROOT(&lgr->conns_all); | |
124 | read_unlock_bh(&lgr->conns_lock); | |
125 | if (!conns) { /* number of lgr connections is no longer zero */ | |
126 | spin_unlock_bh(&smc_lgr_list.lock); | |
127 | return; | |
128 | } | |
129 | list_del_init(&lgr->list); /* remove from smc_lgr_list */ | |
130 | spin_unlock_bh(&smc_lgr_list.lock); | |
131 | smc_lgr_free(lgr); | |
132 | } | |
133 | ||
134 | /* create a new SMC link group */ | |
135 | static int smc_lgr_create(struct smc_sock *smc, __be32 peer_in_addr, | |
136 | struct smc_ib_device *smcibdev, u8 ibport, | |
137 | char *peer_systemid, unsigned short vlan_id) | |
138 | { | |
139 | struct smc_link_group *lgr; | |
140 | struct smc_link *lnk; | |
141 | u8 rndvec[3]; | |
142 | int rc = 0; | |
cd6851f3 | 143 | int i; |
0cfdd8f9 UB |
144 | |
145 | lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); | |
146 | if (!lgr) { | |
147 | rc = -ENOMEM; | |
148 | goto out; | |
149 | } | |
150 | lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; | |
151 | lgr->sync_err = false; | |
152 | lgr->daddr = peer_in_addr; | |
153 | memcpy(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN); | |
154 | lgr->vlan_id = vlan_id; | |
cd6851f3 UB |
155 | rwlock_init(&lgr->sndbufs_lock); |
156 | rwlock_init(&lgr->rmbs_lock); | |
157 | for (i = 0; i < SMC_RMBE_SIZES; i++) { | |
158 | INIT_LIST_HEAD(&lgr->sndbufs[i]); | |
159 | INIT_LIST_HEAD(&lgr->rmbs[i]); | |
160 | } | |
9bf9abea UB |
161 | smc_lgr_num += SMC_LGR_NUM_INCR; |
162 | memcpy(&lgr->id, (u8 *)&smc_lgr_num, SMC_LGR_ID_SIZE); | |
0cfdd8f9 UB |
163 | INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); |
164 | lgr->conns_all = RB_ROOT; | |
165 | ||
166 | lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
167 | /* initialize link */ | |
168 | lnk->smcibdev = smcibdev; | |
169 | lnk->ibport = ibport; | |
170 | lnk->path_mtu = smcibdev->pattr[ibport - 1].active_mtu; | |
bd4ad577 UB |
171 | if (!smcibdev->initialized) |
172 | smc_ib_setup_per_ibdev(smcibdev); | |
0cfdd8f9 UB |
173 | get_random_bytes(rndvec, sizeof(rndvec)); |
174 | lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + (rndvec[2] << 16); | |
f38ba179 UB |
175 | rc = smc_wr_alloc_link_mem(lnk); |
176 | if (rc) | |
177 | goto free_lgr; | |
178 | init_waitqueue_head(&lnk->wr_tx_wait); | |
bd4ad577 UB |
179 | rc = smc_ib_create_protection_domain(lnk); |
180 | if (rc) | |
181 | goto free_link_mem; | |
182 | rc = smc_ib_create_queue_pair(lnk); | |
183 | if (rc) | |
184 | goto dealloc_pd; | |
185 | rc = smc_wr_create_link(lnk); | |
186 | if (rc) | |
187 | goto destroy_qp; | |
9bf9abea UB |
188 | init_completion(&lnk->llc_confirm); |
189 | init_completion(&lnk->llc_confirm_resp); | |
0cfdd8f9 UB |
190 | |
191 | smc->conn.lgr = lgr; | |
192 | rwlock_init(&lgr->conns_lock); | |
193 | spin_lock_bh(&smc_lgr_list.lock); | |
194 | list_add(&lgr->list, &smc_lgr_list.list); | |
195 | spin_unlock_bh(&smc_lgr_list.lock); | |
f38ba179 UB |
196 | return 0; |
197 | ||
bd4ad577 UB |
198 | destroy_qp: |
199 | smc_ib_destroy_queue_pair(lnk); | |
200 | dealloc_pd: | |
201 | smc_ib_dealloc_protection_domain(lnk); | |
202 | free_link_mem: | |
203 | smc_wr_free_link_mem(lnk); | |
f38ba179 UB |
204 | free_lgr: |
205 | kfree(lgr); | |
0cfdd8f9 UB |
206 | out: |
207 | return rc; | |
208 | } | |
209 | ||
cd6851f3 UB |
210 | static void smc_sndbuf_unuse(struct smc_connection *conn) |
211 | { | |
212 | if (conn->sndbuf_desc) { | |
213 | conn->sndbuf_desc->used = 0; | |
214 | conn->sndbuf_size = 0; | |
215 | } | |
216 | } | |
217 | ||
218 | static void smc_rmb_unuse(struct smc_connection *conn) | |
219 | { | |
220 | if (conn->rmb_desc) { | |
221 | conn->rmb_desc->used = 0; | |
222 | conn->rmbe_size = 0; | |
223 | } | |
224 | } | |
225 | ||
0cfdd8f9 UB |
226 | /* remove a finished connection from its link group */ |
227 | void smc_conn_free(struct smc_connection *conn) | |
228 | { | |
229 | struct smc_link_group *lgr = conn->lgr; | |
230 | ||
231 | if (!lgr) | |
232 | return; | |
5f08318f | 233 | smc_cdc_tx_dismiss_slots(conn); |
0cfdd8f9 | 234 | smc_lgr_unregister_conn(conn); |
cd6851f3 UB |
235 | smc_rmb_unuse(conn); |
236 | smc_sndbuf_unuse(conn); | |
0cfdd8f9 UB |
237 | } |
238 | ||
239 | static void smc_link_clear(struct smc_link *lnk) | |
240 | { | |
241 | lnk->peer_qpn = 0; | |
bd4ad577 | 242 | smc_ib_modify_qp_reset(lnk); |
f38ba179 | 243 | smc_wr_free_link(lnk); |
bd4ad577 UB |
244 | smc_ib_destroy_queue_pair(lnk); |
245 | smc_ib_dealloc_protection_domain(lnk); | |
f38ba179 | 246 | smc_wr_free_link_mem(lnk); |
0cfdd8f9 UB |
247 | } |
248 | ||
cd6851f3 UB |
249 | static void smc_lgr_free_sndbufs(struct smc_link_group *lgr) |
250 | { | |
251 | struct smc_buf_desc *sndbuf_desc, *bf_desc; | |
252 | int i; | |
253 | ||
254 | for (i = 0; i < SMC_RMBE_SIZES; i++) { | |
255 | list_for_each_entry_safe(sndbuf_desc, bf_desc, &lgr->sndbufs[i], | |
256 | list) { | |
bd4ad577 UB |
257 | list_del(&sndbuf_desc->list); |
258 | smc_ib_buf_unmap(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
259 | smc_uncompress_bufsize(i), | |
260 | sndbuf_desc, DMA_TO_DEVICE); | |
cd6851f3 UB |
261 | kfree(sndbuf_desc->cpu_addr); |
262 | kfree(sndbuf_desc); | |
263 | } | |
264 | } | |
265 | } | |
266 | ||
267 | static void smc_lgr_free_rmbs(struct smc_link_group *lgr) | |
268 | { | |
269 | struct smc_buf_desc *rmb_desc, *bf_desc; | |
bd4ad577 | 270 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; |
cd6851f3 UB |
271 | int i; |
272 | ||
273 | for (i = 0; i < SMC_RMBE_SIZES; i++) { | |
274 | list_for_each_entry_safe(rmb_desc, bf_desc, &lgr->rmbs[i], | |
275 | list) { | |
bd4ad577 UB |
276 | list_del(&rmb_desc->list); |
277 | smc_ib_buf_unmap(lnk->smcibdev, | |
278 | smc_uncompress_bufsize(i), | |
279 | rmb_desc, DMA_FROM_DEVICE); | |
cd6851f3 UB |
280 | kfree(rmb_desc->cpu_addr); |
281 | kfree(rmb_desc); | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
0cfdd8f9 UB |
286 | /* remove a link group */ |
287 | void smc_lgr_free(struct smc_link_group *lgr) | |
288 | { | |
cd6851f3 UB |
289 | smc_lgr_free_rmbs(lgr); |
290 | smc_lgr_free_sndbufs(lgr); | |
0cfdd8f9 UB |
291 | smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]); |
292 | kfree(lgr); | |
293 | } | |
294 | ||
295 | /* terminate linkgroup abnormally */ | |
296 | void smc_lgr_terminate(struct smc_link_group *lgr) | |
297 | { | |
298 | struct smc_connection *conn; | |
b38d7324 | 299 | struct smc_sock *smc; |
0cfdd8f9 UB |
300 | struct rb_node *node; |
301 | ||
302 | spin_lock_bh(&smc_lgr_list.lock); | |
303 | if (list_empty(&lgr->list)) { | |
304 | /* termination already triggered */ | |
305 | spin_unlock_bh(&smc_lgr_list.lock); | |
306 | return; | |
307 | } | |
308 | /* do not use this link group for new connections */ | |
309 | list_del_init(&lgr->list); | |
310 | spin_unlock_bh(&smc_lgr_list.lock); | |
311 | ||
312 | write_lock_bh(&lgr->conns_lock); | |
313 | node = rb_first(&lgr->conns_all); | |
314 | while (node) { | |
315 | conn = rb_entry(node, struct smc_connection, alert_node); | |
b38d7324 UB |
316 | smc = container_of(conn, struct smc_sock, conn); |
317 | sock_hold(&smc->sk); | |
0cfdd8f9 | 318 | __smc_lgr_unregister_conn(conn); |
46c28dbd | 319 | schedule_work(&conn->close_work); |
b38d7324 | 320 | sock_put(&smc->sk); |
0cfdd8f9 UB |
321 | node = rb_first(&lgr->conns_all); |
322 | } | |
323 | write_unlock_bh(&lgr->conns_lock); | |
0cfdd8f9 UB |
324 | } |
325 | ||
326 | /* Determine vlan of internal TCP socket. | |
327 | * @vlan_id: address to store the determined vlan id into | |
328 | */ | |
329 | static int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id) | |
330 | { | |
331 | struct dst_entry *dst = sk_dst_get(clcsock->sk); | |
332 | int rc = 0; | |
333 | ||
334 | *vlan_id = 0; | |
335 | if (!dst) { | |
336 | rc = -ENOTCONN; | |
337 | goto out; | |
338 | } | |
339 | if (!dst->dev) { | |
340 | rc = -ENODEV; | |
341 | goto out_rel; | |
342 | } | |
343 | ||
344 | if (is_vlan_dev(dst->dev)) | |
345 | *vlan_id = vlan_dev_vlan_id(dst->dev); | |
346 | ||
347 | out_rel: | |
348 | dst_release(dst); | |
349 | out: | |
350 | return rc; | |
351 | } | |
352 | ||
353 | /* determine the link gid matching the vlan id of the link group */ | |
354 | static int smc_link_determine_gid(struct smc_link_group *lgr) | |
355 | { | |
356 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
357 | struct ib_gid_attr gattr; | |
358 | union ib_gid gid; | |
359 | int i; | |
360 | ||
361 | if (!lgr->vlan_id) { | |
362 | lnk->gid = lnk->smcibdev->gid[lnk->ibport - 1]; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | for (i = 0; i < lnk->smcibdev->pattr[lnk->ibport - 1].gid_tbl_len; | |
367 | i++) { | |
368 | if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid, | |
369 | &gattr)) | |
370 | continue; | |
371 | if (gattr.ndev && | |
372 | (vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id)) { | |
373 | lnk->gid = gid; | |
374 | return 0; | |
375 | } | |
376 | } | |
377 | return -ENODEV; | |
378 | } | |
379 | ||
380 | /* create a new SMC connection (and a new link group if necessary) */ | |
381 | int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr, | |
382 | struct smc_ib_device *smcibdev, u8 ibport, | |
383 | struct smc_clc_msg_local *lcl, int srv_first_contact) | |
384 | { | |
385 | struct smc_connection *conn = &smc->conn; | |
386 | struct smc_link_group *lgr; | |
387 | unsigned short vlan_id; | |
388 | enum smc_lgr_role role; | |
389 | int local_contact = SMC_FIRST_CONTACT; | |
390 | int rc = 0; | |
391 | ||
392 | role = smc->listen_smc ? SMC_SERV : SMC_CLNT; | |
393 | rc = smc_vlan_by_tcpsk(smc->clcsock, &vlan_id); | |
394 | if (rc) | |
395 | return rc; | |
396 | ||
397 | if ((role == SMC_CLNT) && srv_first_contact) | |
398 | /* create new link group as well */ | |
399 | goto create; | |
400 | ||
401 | /* determine if an existing link group can be reused */ | |
402 | spin_lock_bh(&smc_lgr_list.lock); | |
403 | list_for_each_entry(lgr, &smc_lgr_list.list, list) { | |
404 | write_lock_bh(&lgr->conns_lock); | |
405 | if (!memcmp(lgr->peer_systemid, lcl->id_for_peer, | |
406 | SMC_SYSTEMID_LEN) && | |
407 | !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid, | |
408 | SMC_GID_SIZE) && | |
409 | !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac, | |
410 | sizeof(lcl->mac)) && | |
411 | !lgr->sync_err && | |
412 | (lgr->role == role) && | |
cd6851f3 UB |
413 | (lgr->vlan_id == vlan_id) && |
414 | ((role == SMC_CLNT) || | |
415 | (lgr->conns_num < SMC_RMBS_PER_LGR_MAX))) { | |
0cfdd8f9 UB |
416 | /* link group found */ |
417 | local_contact = SMC_REUSE_CONTACT; | |
418 | conn->lgr = lgr; | |
419 | smc_lgr_register_conn(conn); /* add smc conn to lgr */ | |
420 | write_unlock_bh(&lgr->conns_lock); | |
421 | break; | |
422 | } | |
423 | write_unlock_bh(&lgr->conns_lock); | |
424 | } | |
425 | spin_unlock_bh(&smc_lgr_list.lock); | |
426 | ||
427 | if (role == SMC_CLNT && !srv_first_contact && | |
428 | (local_contact == SMC_FIRST_CONTACT)) { | |
429 | /* Server reuses a link group, but Client wants to start | |
430 | * a new one | |
431 | * send out_of_sync decline, reason synchr. error | |
432 | */ | |
433 | return -ENOLINK; | |
434 | } | |
435 | ||
436 | create: | |
437 | if (local_contact == SMC_FIRST_CONTACT) { | |
438 | rc = smc_lgr_create(smc, peer_in_addr, smcibdev, ibport, | |
439 | lcl->id_for_peer, vlan_id); | |
440 | if (rc) | |
441 | goto out; | |
442 | smc_lgr_register_conn(conn); /* add smc conn to lgr */ | |
443 | rc = smc_link_determine_gid(conn->lgr); | |
444 | } | |
5f08318f UB |
445 | conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; |
446 | conn->local_tx_ctrl.len = sizeof(struct smc_cdc_msg); | |
447 | #ifndef KERNEL_HAS_ATOMIC64 | |
448 | spin_lock_init(&conn->acurs_lock); | |
449 | #endif | |
0cfdd8f9 UB |
450 | |
451 | out: | |
452 | return rc ? rc : local_contact; | |
453 | } | |
cd6851f3 UB |
454 | |
455 | /* try to reuse a sndbuf description slot of the sndbufs list for a certain | |
456 | * buf_size; if not available, return NULL | |
457 | */ | |
458 | static inline | |
459 | struct smc_buf_desc *smc_sndbuf_get_slot(struct smc_link_group *lgr, | |
460 | int compressed_bufsize) | |
461 | { | |
462 | struct smc_buf_desc *sndbuf_slot; | |
463 | ||
464 | read_lock_bh(&lgr->sndbufs_lock); | |
465 | list_for_each_entry(sndbuf_slot, &lgr->sndbufs[compressed_bufsize], | |
466 | list) { | |
467 | if (cmpxchg(&sndbuf_slot->used, 0, 1) == 0) { | |
468 | read_unlock_bh(&lgr->sndbufs_lock); | |
469 | return sndbuf_slot; | |
470 | } | |
471 | } | |
472 | read_unlock_bh(&lgr->sndbufs_lock); | |
473 | return NULL; | |
474 | } | |
475 | ||
476 | /* try to reuse an rmb description slot of the rmbs list for a certain | |
477 | * rmbe_size; if not available, return NULL | |
478 | */ | |
479 | static inline | |
480 | struct smc_buf_desc *smc_rmb_get_slot(struct smc_link_group *lgr, | |
481 | int compressed_bufsize) | |
482 | { | |
483 | struct smc_buf_desc *rmb_slot; | |
484 | ||
485 | read_lock_bh(&lgr->rmbs_lock); | |
486 | list_for_each_entry(rmb_slot, &lgr->rmbs[compressed_bufsize], | |
487 | list) { | |
488 | if (cmpxchg(&rmb_slot->used, 0, 1) == 0) { | |
489 | read_unlock_bh(&lgr->rmbs_lock); | |
490 | return rmb_slot; | |
491 | } | |
492 | } | |
493 | read_unlock_bh(&lgr->rmbs_lock); | |
494 | return NULL; | |
495 | } | |
496 | ||
952310cc UB |
497 | /* one of the conditions for announcing a receiver's current window size is |
498 | * that it "results in a minimum increase in the window size of 10% of the | |
499 | * receive buffer space" [RFC7609] | |
500 | */ | |
501 | static inline int smc_rmb_wnd_update_limit(int rmbe_size) | |
502 | { | |
503 | return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); | |
504 | } | |
505 | ||
cd6851f3 UB |
506 | /* create the tx buffer for an SMC socket */ |
507 | int smc_sndbuf_create(struct smc_sock *smc) | |
508 | { | |
509 | struct smc_connection *conn = &smc->conn; | |
510 | struct smc_link_group *lgr = conn->lgr; | |
511 | int tmp_bufsize, tmp_bufsize_short; | |
512 | struct smc_buf_desc *sndbuf_desc; | |
513 | int rc; | |
514 | ||
515 | /* use socket send buffer size (w/o overhead) as start value */ | |
516 | for (tmp_bufsize_short = smc_compress_bufsize(smc->sk.sk_sndbuf / 2); | |
517 | tmp_bufsize_short >= 0; tmp_bufsize_short--) { | |
518 | tmp_bufsize = smc_uncompress_bufsize(tmp_bufsize_short); | |
519 | /* check for reusable sndbuf_slot in the link group */ | |
520 | sndbuf_desc = smc_sndbuf_get_slot(lgr, tmp_bufsize_short); | |
521 | if (sndbuf_desc) { | |
522 | memset(sndbuf_desc->cpu_addr, 0, tmp_bufsize); | |
523 | break; /* found reusable slot */ | |
524 | } | |
525 | /* try to alloc a new send buffer */ | |
526 | sndbuf_desc = kzalloc(sizeof(*sndbuf_desc), GFP_KERNEL); | |
527 | if (!sndbuf_desc) | |
528 | break; /* give up with -ENOMEM */ | |
529 | sndbuf_desc->cpu_addr = kzalloc(tmp_bufsize, | |
530 | GFP_KERNEL | __GFP_NOWARN | | |
531 | __GFP_NOMEMALLOC | | |
532 | __GFP_NORETRY); | |
533 | if (!sndbuf_desc->cpu_addr) { | |
534 | kfree(sndbuf_desc); | |
cdaf25df | 535 | sndbuf_desc = NULL; |
cd6851f3 UB |
536 | /* if send buffer allocation has failed, |
537 | * try a smaller one | |
538 | */ | |
539 | continue; | |
540 | } | |
541 | rc = smc_ib_buf_map(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
542 | tmp_bufsize, sndbuf_desc, | |
543 | DMA_TO_DEVICE); | |
544 | if (rc) { | |
545 | kfree(sndbuf_desc->cpu_addr); | |
546 | kfree(sndbuf_desc); | |
cdaf25df | 547 | sndbuf_desc = NULL; |
cd6851f3 UB |
548 | continue; /* if mapping failed, try smaller one */ |
549 | } | |
550 | sndbuf_desc->used = 1; | |
551 | write_lock_bh(&lgr->sndbufs_lock); | |
552 | list_add(&sndbuf_desc->list, | |
553 | &lgr->sndbufs[tmp_bufsize_short]); | |
554 | write_unlock_bh(&lgr->sndbufs_lock); | |
555 | break; | |
556 | } | |
557 | if (sndbuf_desc && sndbuf_desc->cpu_addr) { | |
558 | conn->sndbuf_desc = sndbuf_desc; | |
559 | conn->sndbuf_size = tmp_bufsize; | |
560 | smc->sk.sk_sndbuf = tmp_bufsize * 2; | |
5f08318f | 561 | atomic_set(&conn->sndbuf_space, tmp_bufsize); |
cd6851f3 UB |
562 | return 0; |
563 | } else { | |
564 | return -ENOMEM; | |
565 | } | |
566 | } | |
567 | ||
568 | /* create the RMB for an SMC socket (even though the SMC protocol | |
569 | * allows more than one RMB-element per RMB, the Linux implementation | |
570 | * uses just one RMB-element per RMB, i.e. uses an extra RMB for every | |
571 | * connection in a link group | |
572 | */ | |
573 | int smc_rmb_create(struct smc_sock *smc) | |
574 | { | |
575 | struct smc_connection *conn = &smc->conn; | |
576 | struct smc_link_group *lgr = conn->lgr; | |
577 | int tmp_bufsize, tmp_bufsize_short; | |
578 | struct smc_buf_desc *rmb_desc; | |
579 | int rc; | |
580 | ||
581 | /* use socket recv buffer size (w/o overhead) as start value */ | |
582 | for (tmp_bufsize_short = smc_compress_bufsize(smc->sk.sk_rcvbuf / 2); | |
583 | tmp_bufsize_short >= 0; tmp_bufsize_short--) { | |
584 | tmp_bufsize = smc_uncompress_bufsize(tmp_bufsize_short); | |
585 | /* check for reusable rmb_slot in the link group */ | |
586 | rmb_desc = smc_rmb_get_slot(lgr, tmp_bufsize_short); | |
587 | if (rmb_desc) { | |
588 | memset(rmb_desc->cpu_addr, 0, tmp_bufsize); | |
589 | break; /* found reusable slot */ | |
590 | } | |
591 | /* try to alloc a new RMB */ | |
592 | rmb_desc = kzalloc(sizeof(*rmb_desc), GFP_KERNEL); | |
593 | if (!rmb_desc) | |
594 | break; /* give up with -ENOMEM */ | |
595 | rmb_desc->cpu_addr = kzalloc(tmp_bufsize, | |
596 | GFP_KERNEL | __GFP_NOWARN | | |
597 | __GFP_NOMEMALLOC | | |
598 | __GFP_NORETRY); | |
599 | if (!rmb_desc->cpu_addr) { | |
600 | kfree(rmb_desc); | |
cdaf25df | 601 | rmb_desc = NULL; |
cd6851f3 UB |
602 | /* if RMB allocation has failed, |
603 | * try a smaller one | |
604 | */ | |
605 | continue; | |
606 | } | |
607 | rc = smc_ib_buf_map(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
608 | tmp_bufsize, rmb_desc, | |
609 | DMA_FROM_DEVICE); | |
610 | if (rc) { | |
611 | kfree(rmb_desc->cpu_addr); | |
612 | kfree(rmb_desc); | |
cdaf25df | 613 | rmb_desc = NULL; |
cd6851f3 UB |
614 | continue; /* if mapping failed, try smaller one */ |
615 | } | |
bd4ad577 UB |
616 | rc = smc_ib_get_memory_region(lgr->lnk[SMC_SINGLE_LINK].roce_pd, |
617 | IB_ACCESS_REMOTE_WRITE | | |
618 | IB_ACCESS_LOCAL_WRITE, | |
619 | &rmb_desc->mr_rx[SMC_SINGLE_LINK]); | |
620 | if (rc) { | |
621 | smc_ib_buf_unmap(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
622 | tmp_bufsize, rmb_desc, | |
623 | DMA_FROM_DEVICE); | |
624 | kfree(rmb_desc->cpu_addr); | |
625 | kfree(rmb_desc); | |
cdaf25df | 626 | rmb_desc = NULL; |
bd4ad577 UB |
627 | continue; |
628 | } | |
cd6851f3 UB |
629 | rmb_desc->used = 1; |
630 | write_lock_bh(&lgr->rmbs_lock); | |
631 | list_add(&rmb_desc->list, | |
632 | &lgr->rmbs[tmp_bufsize_short]); | |
633 | write_unlock_bh(&lgr->rmbs_lock); | |
634 | break; | |
635 | } | |
636 | if (rmb_desc && rmb_desc->cpu_addr) { | |
637 | conn->rmb_desc = rmb_desc; | |
638 | conn->rmbe_size = tmp_bufsize; | |
639 | conn->rmbe_size_short = tmp_bufsize_short; | |
640 | smc->sk.sk_rcvbuf = tmp_bufsize * 2; | |
5f08318f | 641 | atomic_set(&conn->bytes_to_rcv, 0); |
952310cc | 642 | conn->rmbe_update_limit = smc_rmb_wnd_update_limit(tmp_bufsize); |
cd6851f3 UB |
643 | return 0; |
644 | } else { | |
645 | return -ENOMEM; | |
646 | } | |
647 | } | |
bd4ad577 UB |
648 | |
649 | static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) | |
650 | { | |
651 | int i; | |
652 | ||
653 | for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { | |
654 | if (!test_and_set_bit(i, lgr->rtokens_used_mask)) | |
655 | return i; | |
656 | } | |
657 | return -ENOSPC; | |
658 | } | |
659 | ||
660 | /* save rkey and dma_addr received from peer during clc handshake */ | |
661 | int smc_rmb_rtoken_handling(struct smc_connection *conn, | |
662 | struct smc_clc_msg_accept_confirm *clc) | |
663 | { | |
664 | u64 dma_addr = be64_to_cpu(clc->rmb_dma_addr); | |
665 | struct smc_link_group *lgr = conn->lgr; | |
666 | u32 rkey = ntohl(clc->rmb_rkey); | |
667 | int i; | |
668 | ||
669 | for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { | |
670 | if ((lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey) && | |
671 | test_bit(i, lgr->rtokens_used_mask)) { | |
672 | conn->rtoken_idx = i; | |
673 | return 0; | |
674 | } | |
675 | } | |
676 | conn->rtoken_idx = smc_rmb_reserve_rtoken_idx(lgr); | |
677 | if (conn->rtoken_idx < 0) | |
678 | return conn->rtoken_idx; | |
679 | lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].rkey = rkey; | |
680 | lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].dma_addr = dma_addr; | |
681 | return 0; | |
682 | } |