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 | |
5bc11ddb UB |
28 | #define SMC_LGR_NUM_INCR 256 |
29 | #define SMC_LGR_FREE_DELAY_SERV (600 * HZ) | |
30 | #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10) | |
0cfdd8f9 | 31 | |
9bf9abea UB |
32 | static u32 smc_lgr_num; /* unique link group number */ |
33 | ||
0cfdd8f9 UB |
34 | /* Register connection's alert token in our lookup structure. |
35 | * To use rbtrees we have to implement our own insert core. | |
36 | * Requires @conns_lock | |
37 | * @smc connection to register | |
38 | * Returns 0 on success, != otherwise. | |
39 | */ | |
40 | static void smc_lgr_add_alert_token(struct smc_connection *conn) | |
41 | { | |
42 | struct rb_node **link, *parent = NULL; | |
43 | u32 token = conn->alert_token_local; | |
44 | ||
45 | link = &conn->lgr->conns_all.rb_node; | |
46 | while (*link) { | |
47 | struct smc_connection *cur = rb_entry(*link, | |
48 | struct smc_connection, alert_node); | |
49 | ||
50 | parent = *link; | |
51 | if (cur->alert_token_local > token) | |
52 | link = &parent->rb_left; | |
53 | else | |
54 | link = &parent->rb_right; | |
55 | } | |
56 | /* Put the new node there */ | |
57 | rb_link_node(&conn->alert_node, parent, link); | |
58 | rb_insert_color(&conn->alert_node, &conn->lgr->conns_all); | |
59 | } | |
60 | ||
61 | /* Register connection in link group by assigning an alert token | |
62 | * registered in a search tree. | |
63 | * Requires @conns_lock | |
64 | * Note that '0' is a reserved value and not assigned. | |
65 | */ | |
66 | static void smc_lgr_register_conn(struct smc_connection *conn) | |
67 | { | |
68 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
69 | static atomic_t nexttoken = ATOMIC_INIT(0); | |
70 | ||
71 | /* find a new alert_token_local value not yet used by some connection | |
72 | * in this link group | |
73 | */ | |
74 | sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */ | |
75 | while (!conn->alert_token_local) { | |
76 | conn->alert_token_local = atomic_inc_return(&nexttoken); | |
77 | if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr)) | |
78 | conn->alert_token_local = 0; | |
79 | } | |
80 | smc_lgr_add_alert_token(conn); | |
81 | conn->lgr->conns_num++; | |
82 | } | |
83 | ||
84 | /* Unregister connection and reset the alert token of the given connection< | |
85 | */ | |
86 | static void __smc_lgr_unregister_conn(struct smc_connection *conn) | |
87 | { | |
88 | struct smc_sock *smc = container_of(conn, struct smc_sock, conn); | |
89 | struct smc_link_group *lgr = conn->lgr; | |
90 | ||
91 | rb_erase(&conn->alert_node, &lgr->conns_all); | |
92 | lgr->conns_num--; | |
93 | conn->alert_token_local = 0; | |
94 | conn->lgr = NULL; | |
95 | sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */ | |
96 | } | |
97 | ||
98 | /* Unregister connection and trigger lgr freeing if applicable | |
99 | */ | |
100 | static void smc_lgr_unregister_conn(struct smc_connection *conn) | |
101 | { | |
102 | struct smc_link_group *lgr = conn->lgr; | |
103 | int reduced = 0; | |
104 | ||
105 | write_lock_bh(&lgr->conns_lock); | |
106 | if (conn->alert_token_local) { | |
107 | reduced = 1; | |
108 | __smc_lgr_unregister_conn(conn); | |
109 | } | |
110 | write_unlock_bh(&lgr->conns_lock); | |
5bc11ddb UB |
111 | if (!reduced || lgr->conns_num) |
112 | return; | |
113 | /* client link group creation always follows the server link group | |
114 | * creation. For client use a somewhat higher removal delay time, | |
115 | * otherwise there is a risk of out-of-sync link groups. | |
116 | */ | |
117 | mod_delayed_work(system_wq, &lgr->free_work, | |
118 | lgr->role == SMC_CLNT ? SMC_LGR_FREE_DELAY_CLNT : | |
119 | SMC_LGR_FREE_DELAY_SERV); | |
0cfdd8f9 UB |
120 | } |
121 | ||
122 | static void smc_lgr_free_work(struct work_struct *work) | |
123 | { | |
124 | struct smc_link_group *lgr = container_of(to_delayed_work(work), | |
125 | struct smc_link_group, | |
126 | free_work); | |
127 | bool conns; | |
128 | ||
129 | spin_lock_bh(&smc_lgr_list.lock); | |
130 | read_lock_bh(&lgr->conns_lock); | |
131 | conns = RB_EMPTY_ROOT(&lgr->conns_all); | |
132 | read_unlock_bh(&lgr->conns_lock); | |
133 | if (!conns) { /* number of lgr connections is no longer zero */ | |
134 | spin_unlock_bh(&smc_lgr_list.lock); | |
135 | return; | |
136 | } | |
137 | list_del_init(&lgr->list); /* remove from smc_lgr_list */ | |
138 | spin_unlock_bh(&smc_lgr_list.lock); | |
139 | smc_lgr_free(lgr); | |
140 | } | |
141 | ||
142 | /* create a new SMC link group */ | |
143 | static int smc_lgr_create(struct smc_sock *smc, __be32 peer_in_addr, | |
144 | struct smc_ib_device *smcibdev, u8 ibport, | |
145 | char *peer_systemid, unsigned short vlan_id) | |
146 | { | |
147 | struct smc_link_group *lgr; | |
148 | struct smc_link *lnk; | |
149 | u8 rndvec[3]; | |
150 | int rc = 0; | |
cd6851f3 | 151 | int i; |
0cfdd8f9 UB |
152 | |
153 | lgr = kzalloc(sizeof(*lgr), GFP_KERNEL); | |
154 | if (!lgr) { | |
155 | rc = -ENOMEM; | |
156 | goto out; | |
157 | } | |
158 | lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT; | |
159 | lgr->sync_err = false; | |
160 | lgr->daddr = peer_in_addr; | |
161 | memcpy(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN); | |
162 | lgr->vlan_id = vlan_id; | |
cd6851f3 UB |
163 | rwlock_init(&lgr->sndbufs_lock); |
164 | rwlock_init(&lgr->rmbs_lock); | |
165 | for (i = 0; i < SMC_RMBE_SIZES; i++) { | |
166 | INIT_LIST_HEAD(&lgr->sndbufs[i]); | |
167 | INIT_LIST_HEAD(&lgr->rmbs[i]); | |
168 | } | |
9bf9abea UB |
169 | smc_lgr_num += SMC_LGR_NUM_INCR; |
170 | memcpy(&lgr->id, (u8 *)&smc_lgr_num, SMC_LGR_ID_SIZE); | |
0cfdd8f9 UB |
171 | INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work); |
172 | lgr->conns_all = RB_ROOT; | |
173 | ||
174 | lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
175 | /* initialize link */ | |
176 | lnk->smcibdev = smcibdev; | |
177 | lnk->ibport = ibport; | |
178 | lnk->path_mtu = smcibdev->pattr[ibport - 1].active_mtu; | |
bd4ad577 UB |
179 | if (!smcibdev->initialized) |
180 | smc_ib_setup_per_ibdev(smcibdev); | |
0cfdd8f9 UB |
181 | get_random_bytes(rndvec, sizeof(rndvec)); |
182 | lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + (rndvec[2] << 16); | |
f38ba179 UB |
183 | rc = smc_wr_alloc_link_mem(lnk); |
184 | if (rc) | |
185 | goto free_lgr; | |
bd4ad577 UB |
186 | rc = smc_ib_create_protection_domain(lnk); |
187 | if (rc) | |
188 | goto free_link_mem; | |
189 | rc = smc_ib_create_queue_pair(lnk); | |
190 | if (rc) | |
191 | goto dealloc_pd; | |
192 | rc = smc_wr_create_link(lnk); | |
193 | if (rc) | |
194 | goto destroy_qp; | |
9bf9abea UB |
195 | init_completion(&lnk->llc_confirm); |
196 | init_completion(&lnk->llc_confirm_resp); | |
0cfdd8f9 UB |
197 | |
198 | smc->conn.lgr = lgr; | |
199 | rwlock_init(&lgr->conns_lock); | |
200 | spin_lock_bh(&smc_lgr_list.lock); | |
201 | list_add(&lgr->list, &smc_lgr_list.list); | |
202 | spin_unlock_bh(&smc_lgr_list.lock); | |
f38ba179 UB |
203 | return 0; |
204 | ||
bd4ad577 UB |
205 | destroy_qp: |
206 | smc_ib_destroy_queue_pair(lnk); | |
207 | dealloc_pd: | |
208 | smc_ib_dealloc_protection_domain(lnk); | |
209 | free_link_mem: | |
210 | smc_wr_free_link_mem(lnk); | |
f38ba179 UB |
211 | free_lgr: |
212 | kfree(lgr); | |
0cfdd8f9 UB |
213 | out: |
214 | return rc; | |
215 | } | |
216 | ||
3e034725 | 217 | static void smc_buf_unuse(struct smc_connection *conn) |
cd6851f3 UB |
218 | { |
219 | if (conn->sndbuf_desc) { | |
220 | conn->sndbuf_desc->used = 0; | |
221 | conn->sndbuf_size = 0; | |
222 | } | |
cd6851f3 | 223 | if (conn->rmb_desc) { |
897e1c24 | 224 | conn->rmb_desc->reused = true; |
cd6851f3 UB |
225 | conn->rmb_desc->used = 0; |
226 | conn->rmbe_size = 0; | |
227 | } | |
228 | } | |
229 | ||
0cfdd8f9 UB |
230 | /* remove a finished connection from its link group */ |
231 | void smc_conn_free(struct smc_connection *conn) | |
232 | { | |
233 | struct smc_link_group *lgr = conn->lgr; | |
234 | ||
235 | if (!lgr) | |
236 | return; | |
5f08318f | 237 | smc_cdc_tx_dismiss_slots(conn); |
0cfdd8f9 | 238 | smc_lgr_unregister_conn(conn); |
3e034725 | 239 | smc_buf_unuse(conn); |
0cfdd8f9 UB |
240 | } |
241 | ||
242 | static void smc_link_clear(struct smc_link *lnk) | |
243 | { | |
244 | lnk->peer_qpn = 0; | |
bd4ad577 | 245 | smc_ib_modify_qp_reset(lnk); |
f38ba179 | 246 | smc_wr_free_link(lnk); |
bd4ad577 UB |
247 | smc_ib_destroy_queue_pair(lnk); |
248 | smc_ib_dealloc_protection_domain(lnk); | |
f38ba179 | 249 | smc_wr_free_link_mem(lnk); |
0cfdd8f9 UB |
250 | } |
251 | ||
3e034725 UB |
252 | static void smc_buf_free(struct smc_buf_desc *buf_desc, struct smc_link *lnk, |
253 | bool is_rmb) | |
cd6851f3 | 254 | { |
3e034725 UB |
255 | if (is_rmb) { |
256 | if (buf_desc->mr_rx[SMC_SINGLE_LINK]) | |
257 | smc_ib_put_memory_region( | |
258 | buf_desc->mr_rx[SMC_SINGLE_LINK]); | |
259 | smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc, | |
260 | DMA_FROM_DEVICE); | |
261 | } else { | |
262 | smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc, | |
263 | DMA_TO_DEVICE); | |
cd6851f3 | 264 | } |
3e034725 UB |
265 | sg_free_table(&buf_desc->sgt[SMC_SINGLE_LINK]); |
266 | if (buf_desc->cpu_addr) | |
267 | free_pages((unsigned long)buf_desc->cpu_addr, buf_desc->order); | |
268 | kfree(buf_desc); | |
cd6851f3 UB |
269 | } |
270 | ||
3e034725 | 271 | static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb) |
cd6851f3 | 272 | { |
bd4ad577 | 273 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; |
3e034725 UB |
274 | struct smc_buf_desc *buf_desc, *bf_desc; |
275 | struct list_head *buf_list; | |
cd6851f3 UB |
276 | int i; |
277 | ||
278 | for (i = 0; i < SMC_RMBE_SIZES; i++) { | |
3e034725 UB |
279 | if (is_rmb) |
280 | buf_list = &lgr->rmbs[i]; | |
281 | else | |
282 | buf_list = &lgr->sndbufs[i]; | |
283 | list_for_each_entry_safe(buf_desc, bf_desc, buf_list, | |
cd6851f3 | 284 | list) { |
3e034725 UB |
285 | list_del(&buf_desc->list); |
286 | smc_buf_free(buf_desc, lnk, is_rmb); | |
cd6851f3 UB |
287 | } |
288 | } | |
289 | } | |
290 | ||
3e034725 UB |
291 | static void smc_lgr_free_bufs(struct smc_link_group *lgr) |
292 | { | |
293 | /* free send buffers */ | |
294 | __smc_lgr_free_bufs(lgr, false); | |
295 | /* free rmbs */ | |
296 | __smc_lgr_free_bufs(lgr, true); | |
297 | } | |
298 | ||
0cfdd8f9 UB |
299 | /* remove a link group */ |
300 | void smc_lgr_free(struct smc_link_group *lgr) | |
301 | { | |
3e034725 | 302 | smc_lgr_free_bufs(lgr); |
0cfdd8f9 UB |
303 | smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]); |
304 | kfree(lgr); | |
305 | } | |
306 | ||
307 | /* terminate linkgroup abnormally */ | |
308 | void smc_lgr_terminate(struct smc_link_group *lgr) | |
309 | { | |
310 | struct smc_connection *conn; | |
b38d7324 | 311 | struct smc_sock *smc; |
0cfdd8f9 UB |
312 | struct rb_node *node; |
313 | ||
314 | spin_lock_bh(&smc_lgr_list.lock); | |
315 | if (list_empty(&lgr->list)) { | |
316 | /* termination already triggered */ | |
317 | spin_unlock_bh(&smc_lgr_list.lock); | |
318 | return; | |
319 | } | |
320 | /* do not use this link group for new connections */ | |
321 | list_del_init(&lgr->list); | |
322 | spin_unlock_bh(&smc_lgr_list.lock); | |
323 | ||
324 | write_lock_bh(&lgr->conns_lock); | |
325 | node = rb_first(&lgr->conns_all); | |
326 | while (node) { | |
327 | conn = rb_entry(node, struct smc_connection, alert_node); | |
b38d7324 UB |
328 | smc = container_of(conn, struct smc_sock, conn); |
329 | sock_hold(&smc->sk); | |
0cfdd8f9 | 330 | __smc_lgr_unregister_conn(conn); |
46c28dbd | 331 | schedule_work(&conn->close_work); |
b38d7324 | 332 | sock_put(&smc->sk); |
0cfdd8f9 UB |
333 | node = rb_first(&lgr->conns_all); |
334 | } | |
335 | write_unlock_bh(&lgr->conns_lock); | |
0cfdd8f9 UB |
336 | } |
337 | ||
338 | /* Determine vlan of internal TCP socket. | |
339 | * @vlan_id: address to store the determined vlan id into | |
340 | */ | |
341 | static int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id) | |
342 | { | |
343 | struct dst_entry *dst = sk_dst_get(clcsock->sk); | |
344 | int rc = 0; | |
345 | ||
346 | *vlan_id = 0; | |
347 | if (!dst) { | |
348 | rc = -ENOTCONN; | |
349 | goto out; | |
350 | } | |
351 | if (!dst->dev) { | |
352 | rc = -ENODEV; | |
353 | goto out_rel; | |
354 | } | |
355 | ||
356 | if (is_vlan_dev(dst->dev)) | |
357 | *vlan_id = vlan_dev_vlan_id(dst->dev); | |
358 | ||
359 | out_rel: | |
360 | dst_release(dst); | |
361 | out: | |
362 | return rc; | |
363 | } | |
364 | ||
365 | /* determine the link gid matching the vlan id of the link group */ | |
366 | static int smc_link_determine_gid(struct smc_link_group *lgr) | |
367 | { | |
368 | struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
369 | struct ib_gid_attr gattr; | |
370 | union ib_gid gid; | |
371 | int i; | |
372 | ||
373 | if (!lgr->vlan_id) { | |
374 | lnk->gid = lnk->smcibdev->gid[lnk->ibport - 1]; | |
375 | return 0; | |
376 | } | |
377 | ||
378 | for (i = 0; i < lnk->smcibdev->pattr[lnk->ibport - 1].gid_tbl_len; | |
379 | i++) { | |
380 | if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid, | |
381 | &gattr)) | |
382 | continue; | |
383 | if (gattr.ndev && | |
384 | (vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id)) { | |
385 | lnk->gid = gid; | |
386 | return 0; | |
387 | } | |
388 | } | |
389 | return -ENODEV; | |
390 | } | |
391 | ||
392 | /* create a new SMC connection (and a new link group if necessary) */ | |
393 | int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr, | |
394 | struct smc_ib_device *smcibdev, u8 ibport, | |
395 | struct smc_clc_msg_local *lcl, int srv_first_contact) | |
396 | { | |
397 | struct smc_connection *conn = &smc->conn; | |
398 | struct smc_link_group *lgr; | |
399 | unsigned short vlan_id; | |
400 | enum smc_lgr_role role; | |
401 | int local_contact = SMC_FIRST_CONTACT; | |
402 | int rc = 0; | |
403 | ||
404 | role = smc->listen_smc ? SMC_SERV : SMC_CLNT; | |
405 | rc = smc_vlan_by_tcpsk(smc->clcsock, &vlan_id); | |
406 | if (rc) | |
407 | return rc; | |
408 | ||
409 | if ((role == SMC_CLNT) && srv_first_contact) | |
410 | /* create new link group as well */ | |
411 | goto create; | |
412 | ||
413 | /* determine if an existing link group can be reused */ | |
414 | spin_lock_bh(&smc_lgr_list.lock); | |
415 | list_for_each_entry(lgr, &smc_lgr_list.list, list) { | |
416 | write_lock_bh(&lgr->conns_lock); | |
417 | if (!memcmp(lgr->peer_systemid, lcl->id_for_peer, | |
418 | SMC_SYSTEMID_LEN) && | |
419 | !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid, | |
420 | SMC_GID_SIZE) && | |
421 | !memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac, | |
422 | sizeof(lcl->mac)) && | |
423 | !lgr->sync_err && | |
424 | (lgr->role == role) && | |
cd6851f3 UB |
425 | (lgr->vlan_id == vlan_id) && |
426 | ((role == SMC_CLNT) || | |
427 | (lgr->conns_num < SMC_RMBS_PER_LGR_MAX))) { | |
0cfdd8f9 UB |
428 | /* link group found */ |
429 | local_contact = SMC_REUSE_CONTACT; | |
430 | conn->lgr = lgr; | |
431 | smc_lgr_register_conn(conn); /* add smc conn to lgr */ | |
432 | write_unlock_bh(&lgr->conns_lock); | |
433 | break; | |
434 | } | |
435 | write_unlock_bh(&lgr->conns_lock); | |
436 | } | |
437 | spin_unlock_bh(&smc_lgr_list.lock); | |
438 | ||
439 | if (role == SMC_CLNT && !srv_first_contact && | |
440 | (local_contact == SMC_FIRST_CONTACT)) { | |
441 | /* Server reuses a link group, but Client wants to start | |
442 | * a new one | |
443 | * send out_of_sync decline, reason synchr. error | |
444 | */ | |
445 | return -ENOLINK; | |
446 | } | |
447 | ||
448 | create: | |
449 | if (local_contact == SMC_FIRST_CONTACT) { | |
450 | rc = smc_lgr_create(smc, peer_in_addr, smcibdev, ibport, | |
451 | lcl->id_for_peer, vlan_id); | |
452 | if (rc) | |
453 | goto out; | |
454 | smc_lgr_register_conn(conn); /* add smc conn to lgr */ | |
455 | rc = smc_link_determine_gid(conn->lgr); | |
456 | } | |
5f08318f UB |
457 | conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE; |
458 | conn->local_tx_ctrl.len = sizeof(struct smc_cdc_msg); | |
459 | #ifndef KERNEL_HAS_ATOMIC64 | |
460 | spin_lock_init(&conn->acurs_lock); | |
461 | #endif | |
0cfdd8f9 UB |
462 | |
463 | out: | |
464 | return rc ? rc : local_contact; | |
465 | } | |
cd6851f3 | 466 | |
3e034725 UB |
467 | /* try to reuse a sndbuf or rmb description slot for a certain |
468 | * buffer size; if not available, return NULL | |
cd6851f3 UB |
469 | */ |
470 | static inline | |
3e034725 UB |
471 | struct smc_buf_desc *smc_buf_get_slot(struct smc_link_group *lgr, |
472 | int compressed_bufsize, | |
473 | rwlock_t *lock, | |
474 | struct list_head *buf_list) | |
cd6851f3 | 475 | { |
3e034725 | 476 | struct smc_buf_desc *buf_slot; |
cd6851f3 | 477 | |
3e034725 UB |
478 | read_lock_bh(lock); |
479 | list_for_each_entry(buf_slot, buf_list, list) { | |
480 | if (cmpxchg(&buf_slot->used, 0, 1) == 0) { | |
481 | read_unlock_bh(lock); | |
482 | return buf_slot; | |
cd6851f3 UB |
483 | } |
484 | } | |
3e034725 | 485 | read_unlock_bh(lock); |
cd6851f3 UB |
486 | return NULL; |
487 | } | |
488 | ||
952310cc UB |
489 | /* one of the conditions for announcing a receiver's current window size is |
490 | * that it "results in a minimum increase in the window size of 10% of the | |
491 | * receive buffer space" [RFC7609] | |
492 | */ | |
493 | static inline int smc_rmb_wnd_update_limit(int rmbe_size) | |
494 | { | |
495 | return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2); | |
496 | } | |
497 | ||
b33982c3 UB |
498 | static struct smc_buf_desc *smc_new_buf_create(struct smc_link_group *lgr, |
499 | bool is_rmb, int bufsize) | |
500 | { | |
501 | struct smc_buf_desc *buf_desc; | |
502 | struct smc_link *lnk; | |
503 | int rc; | |
504 | ||
505 | /* try to alloc a new buffer */ | |
506 | buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL); | |
507 | if (!buf_desc) | |
508 | return ERR_PTR(-ENOMEM); | |
509 | ||
510 | buf_desc->cpu_addr = | |
511 | (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | | |
512 | __GFP_NOMEMALLOC | | |
513 | __GFP_NORETRY | __GFP_ZERO, | |
514 | get_order(bufsize)); | |
515 | if (!buf_desc->cpu_addr) { | |
516 | kfree(buf_desc); | |
517 | return ERR_PTR(-EAGAIN); | |
518 | } | |
519 | buf_desc->order = get_order(bufsize); | |
520 | ||
521 | /* build the sg table from the pages */ | |
522 | lnk = &lgr->lnk[SMC_SINGLE_LINK]; | |
523 | rc = sg_alloc_table(&buf_desc->sgt[SMC_SINGLE_LINK], 1, | |
524 | GFP_KERNEL); | |
525 | if (rc) { | |
526 | smc_buf_free(buf_desc, lnk, is_rmb); | |
527 | return ERR_PTR(rc); | |
528 | } | |
529 | sg_set_buf(buf_desc->sgt[SMC_SINGLE_LINK].sgl, | |
530 | buf_desc->cpu_addr, bufsize); | |
531 | ||
532 | /* map sg table to DMA address */ | |
533 | rc = smc_ib_buf_map_sg(lnk->smcibdev, buf_desc, | |
534 | is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE); | |
535 | /* SMC protocol depends on mapping to one DMA address only */ | |
536 | if (rc != 1) { | |
537 | smc_buf_free(buf_desc, lnk, is_rmb); | |
538 | return ERR_PTR(-EAGAIN); | |
539 | } | |
540 | ||
541 | /* create a new memory region for the RMB */ | |
542 | if (is_rmb) { | |
543 | rc = smc_ib_get_memory_region(lnk->roce_pd, | |
544 | IB_ACCESS_REMOTE_WRITE | | |
545 | IB_ACCESS_LOCAL_WRITE, | |
546 | buf_desc); | |
547 | if (rc) { | |
548 | smc_buf_free(buf_desc, lnk, is_rmb); | |
549 | return ERR_PTR(rc); | |
550 | } | |
551 | } | |
552 | ||
553 | return buf_desc; | |
554 | } | |
555 | ||
3e034725 | 556 | static int __smc_buf_create(struct smc_sock *smc, bool is_rmb) |
cd6851f3 UB |
557 | { |
558 | struct smc_connection *conn = &smc->conn; | |
559 | struct smc_link_group *lgr = conn->lgr; | |
3e034725 UB |
560 | struct smc_buf_desc *buf_desc = NULL; |
561 | struct list_head *buf_list; | |
c45abf31 | 562 | int bufsize, bufsize_short; |
3e034725 UB |
563 | int sk_buf_size; |
564 | rwlock_t *lock; | |
cd6851f3 | 565 | |
3e034725 UB |
566 | if (is_rmb) |
567 | /* use socket recv buffer size (w/o overhead) as start value */ | |
568 | sk_buf_size = smc->sk.sk_rcvbuf / 2; | |
569 | else | |
570 | /* use socket send buffer size (w/o overhead) as start value */ | |
571 | sk_buf_size = smc->sk.sk_sndbuf / 2; | |
572 | ||
c45abf31 UB |
573 | for (bufsize_short = smc_compress_bufsize(smc->sk.sk_sndbuf / 2); |
574 | bufsize_short >= 0; bufsize_short--) { | |
9d8fb617 | 575 | |
3e034725 UB |
576 | if (is_rmb) { |
577 | lock = &lgr->rmbs_lock; | |
578 | buf_list = &lgr->rmbs[bufsize_short]; | |
579 | } else { | |
580 | lock = &lgr->sndbufs_lock; | |
581 | buf_list = &lgr->sndbufs[bufsize_short]; | |
9d8fb617 | 582 | } |
c45abf31 | 583 | bufsize = smc_uncompress_bufsize(bufsize_short); |
a3fe3d01 UB |
584 | if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC) |
585 | continue; | |
586 | ||
3e034725 UB |
587 | /* check for reusable slot in the link group */ |
588 | buf_desc = smc_buf_get_slot(lgr, bufsize_short, lock, buf_list); | |
589 | if (buf_desc) { | |
590 | memset(buf_desc->cpu_addr, 0, bufsize); | |
cd6851f3 UB |
591 | break; /* found reusable slot */ |
592 | } | |
a3fe3d01 | 593 | |
b33982c3 UB |
594 | buf_desc = smc_new_buf_create(lgr, is_rmb, bufsize); |
595 | if (PTR_ERR(buf_desc) == -ENOMEM) | |
596 | break; | |
597 | if (IS_ERR(buf_desc)) | |
a3fe3d01 | 598 | continue; |
897e1c24 | 599 | |
3e034725 UB |
600 | buf_desc->used = 1; |
601 | write_lock_bh(lock); | |
602 | list_add(&buf_desc->list, buf_list); | |
603 | write_unlock_bh(lock); | |
604 | break; /* found */ | |
cd6851f3 | 605 | } |
3e034725 | 606 | |
b33982c3 | 607 | if (IS_ERR(buf_desc)) |
3e034725 UB |
608 | return -ENOMEM; |
609 | ||
610 | if (is_rmb) { | |
611 | conn->rmb_desc = buf_desc; | |
c45abf31 UB |
612 | conn->rmbe_size = bufsize; |
613 | conn->rmbe_size_short = bufsize_short; | |
614 | smc->sk.sk_rcvbuf = bufsize * 2; | |
5f08318f | 615 | atomic_set(&conn->bytes_to_rcv, 0); |
c45abf31 | 616 | conn->rmbe_update_limit = smc_rmb_wnd_update_limit(bufsize); |
cd6851f3 | 617 | } else { |
3e034725 UB |
618 | conn->sndbuf_desc = buf_desc; |
619 | conn->sndbuf_size = bufsize; | |
620 | smc->sk.sk_sndbuf = bufsize * 2; | |
621 | atomic_set(&conn->sndbuf_space, bufsize); | |
cd6851f3 | 622 | } |
3e034725 UB |
623 | return 0; |
624 | } | |
625 | ||
10428dd8 UB |
626 | void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn) |
627 | { | |
628 | struct smc_link_group *lgr = conn->lgr; | |
629 | ||
630 | smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
631 | conn->sndbuf_desc, DMA_TO_DEVICE); | |
632 | } | |
633 | ||
634 | void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn) | |
635 | { | |
636 | struct smc_link_group *lgr = conn->lgr; | |
637 | ||
638 | smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
639 | conn->sndbuf_desc, DMA_TO_DEVICE); | |
640 | } | |
641 | ||
642 | void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn) | |
643 | { | |
644 | struct smc_link_group *lgr = conn->lgr; | |
645 | ||
646 | smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
647 | conn->rmb_desc, DMA_FROM_DEVICE); | |
648 | } | |
649 | ||
650 | void smc_rmb_sync_sg_for_device(struct smc_connection *conn) | |
651 | { | |
652 | struct smc_link_group *lgr = conn->lgr; | |
653 | ||
654 | smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev, | |
655 | conn->rmb_desc, DMA_FROM_DEVICE); | |
656 | } | |
657 | ||
3e034725 UB |
658 | /* create the send and receive buffer for an SMC socket; |
659 | * receive buffers are called RMBs; | |
660 | * (even though the SMC protocol allows more than one RMB-element per RMB, | |
661 | * the Linux implementation uses just one RMB-element per RMB, i.e. uses an | |
662 | * extra RMB for every connection in a link group | |
663 | */ | |
664 | int smc_buf_create(struct smc_sock *smc) | |
665 | { | |
666 | int rc; | |
667 | ||
668 | /* create send buffer */ | |
669 | rc = __smc_buf_create(smc, false); | |
670 | if (rc) | |
671 | return rc; | |
672 | /* create rmb */ | |
673 | rc = __smc_buf_create(smc, true); | |
674 | if (rc) | |
675 | smc_buf_free(smc->conn.sndbuf_desc, | |
676 | &smc->conn.lgr->lnk[SMC_SINGLE_LINK], false); | |
677 | return rc; | |
cd6851f3 | 678 | } |
bd4ad577 UB |
679 | |
680 | static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr) | |
681 | { | |
682 | int i; | |
683 | ||
684 | for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) { | |
685 | if (!test_and_set_bit(i, lgr->rtokens_used_mask)) | |
686 | return i; | |
687 | } | |
688 | return -ENOSPC; | |
689 | } | |
690 | ||
691 | /* save rkey and dma_addr received from peer during clc handshake */ | |
692 | int smc_rmb_rtoken_handling(struct smc_connection *conn, | |
693 | struct smc_clc_msg_accept_confirm *clc) | |
694 | { | |
695 | u64 dma_addr = be64_to_cpu(clc->rmb_dma_addr); | |
696 | struct smc_link_group *lgr = conn->lgr; | |
697 | u32 rkey = ntohl(clc->rmb_rkey); | |
698 | int i; | |
699 | ||
700 | for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) { | |
701 | if ((lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey) && | |
263eec9b | 702 | (lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr == dma_addr) && |
bd4ad577 UB |
703 | test_bit(i, lgr->rtokens_used_mask)) { |
704 | conn->rtoken_idx = i; | |
705 | return 0; | |
706 | } | |
707 | } | |
708 | conn->rtoken_idx = smc_rmb_reserve_rtoken_idx(lgr); | |
709 | if (conn->rtoken_idx < 0) | |
710 | return conn->rtoken_idx; | |
711 | lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].rkey = rkey; | |
712 | lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].dma_addr = dma_addr; | |
713 | return 0; | |
714 | } |