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net/smc: wait for departure of an IB message
[linux-block.git] / net / smc / smc_llc.c
CommitLineData
b2441318 1// SPDX-License-Identifier: GPL-2.0
9bf9abea
UB		 2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * Link Layer Control (LLC)
6 *
9bf9abea
UB		 7 * Copyright IBM Corp. 2016
8 *
9 * Author(s): Klaus Wacker <Klaus.Wacker@de.ibm.com>
10 * Ursula Braun <ubraun@linux.vnet.ibm.com>
11 */
12
13#include <net/tcp.h>
14#include <rdma/ib_verbs.h>
15
16#include "smc.h"
17#include "smc_core.h"
18#include "smc_clc.h"
19#include "smc_llc.h"
336ba09f 20#include "smc_pnet.h"
9bf9abea 21
0f627126
SR		 22#define SMC_LLC_DATA_LEN 40
23
24struct smc_llc_hdr {
25 struct smc_wr_rx_hdr common;
26 u8 length; /* 44 */
52bedf37
KG		 27#if defined(__BIG_ENDIAN_BITFIELD)
28 u8 reserved:4,
29 add_link_rej_rsn:4;
30#elif defined(__LITTLE_ENDIAN_BITFIELD)
31 u8 add_link_rej_rsn:4,
32 reserved:4;
33#endif
0f627126
SR		 34 u8 flags;
35};
36
75d320d6
KG		 37#define SMC_LLC_FLAG_NO_RMBE_EYEC 0x03
38
0f627126
SR		 39struct smc_llc_msg_confirm_link { /* type 0x01 */
40 struct smc_llc_hdr hd;
41 u8 sender_mac[ETH_ALEN];
42 u8 sender_gid[SMC_GID_SIZE];
43 u8 sender_qp_num[3];
44 u8 link_num;
45 u8 link_uid[SMC_LGR_ID_SIZE];
46 u8 max_links;
47 u8 reserved[9];
48};
49
52bedf37
KG		 50#define SMC_LLC_FLAG_ADD_LNK_REJ 0x40
51#define SMC_LLC_REJ_RSN_NO_ALT_PATH 1
52
53#define SMC_LLC_ADD_LNK_MAX_LINKS 2
54
55struct smc_llc_msg_add_link { /* type 0x02 */
56 struct smc_llc_hdr hd;
57 u8 sender_mac[ETH_ALEN];
58 u8 reserved2[2];
59 u8 sender_gid[SMC_GID_SIZE];
60 u8 sender_qp_num[3];
61 u8 link_num;
fbed3b37
KG		 62#if defined(__BIG_ENDIAN_BITFIELD)
63 u8 reserved3 : 4,
64 qp_mtu : 4;
65#elif defined(__LITTLE_ENDIAN_BITFIELD)
66 u8 qp_mtu : 4,
67 reserved3 : 4;
68#endif
52bedf37
KG		 69 u8 initial_psn[3];
70 u8 reserved[8];
71};
72
87f88cda
KG		 73struct smc_llc_msg_add_link_cont_rt {
74 __be32 rmb_key;
75 __be32 rmb_key_new;
76 __be64 rmb_vaddr_new;
77};
78
79#define SMC_LLC_RKEYS_PER_CONT_MSG 2
80
81struct smc_llc_msg_add_link_cont { /* type 0x03 */
82 struct smc_llc_hdr hd;
83 u8 link_num;
84 u8 num_rkeys;
85 u8 reserved2[2];
86 struct smc_llc_msg_add_link_cont_rt rt[SMC_LLC_RKEYS_PER_CONT_MSG];
87 u8 reserved[4];
88} __packed; /* format defined in RFC7609 */
89
52bedf37
KG		 90#define SMC_LLC_FLAG_DEL_LINK_ALL 0x40
91#define SMC_LLC_FLAG_DEL_LINK_ORDERLY 0x20
92
93struct smc_llc_msg_del_link { /* type 0x04 */
94 struct smc_llc_hdr hd;
95 u8 link_num;
96 __be32 reason;
97 u8 reserved[35];
98} __packed; /* format defined in RFC7609 */
99
313164da
KG		 100struct smc_llc_msg_test_link { /* type 0x07 */
101 struct smc_llc_hdr hd;
102 u8 user_data[16];
103 u8 reserved[24];
104};
105
4ed75de5
KG		 106struct smc_rmb_rtoken {
107 union {
108 u8 num_rkeys; /* first rtoken byte of CONFIRM LINK msg */
109 /* is actually the num of rtokens, first */
110 /* rtoken is always for the current link */
111 u8 link_id; /* link id of the rtoken */
112 };
113 __be32 rmb_key;
114 __be64 rmb_vaddr;
115} __packed; /* format defined in RFC7609 */
116
117#define SMC_LLC_RKEYS_PER_MSG 3
118
119struct smc_llc_msg_confirm_rkey { /* type 0x06 */
120 struct smc_llc_hdr hd;
121 struct smc_rmb_rtoken rtoken[SMC_LLC_RKEYS_PER_MSG];
122 u8 reserved;
123};
124
4ed75de5 125#define SMC_LLC_DEL_RKEY_MAX 8
3bc67e09 126#define SMC_LLC_FLAG_RKEY_RETRY 0x10
4ed75de5
KG		 127#define SMC_LLC_FLAG_RKEY_NEG 0x20
128
129struct smc_llc_msg_delete_rkey { /* type 0x09 */
130 struct smc_llc_hdr hd;
131 u8 num_rkeys;
132 u8 err_mask;
133 u8 reserved[2];
134 __be32 rkey[8];
135 u8 reserved2[4];
136};
137
0f627126
SR		 138union smc_llc_msg {
139 struct smc_llc_msg_confirm_link confirm_link;
52bedf37 140 struct smc_llc_msg_add_link add_link;
87f88cda 141 struct smc_llc_msg_add_link_cont add_link_cont;
52bedf37 142 struct smc_llc_msg_del_link delete_link;
4ed75de5
KG		 143
144 struct smc_llc_msg_confirm_rkey confirm_rkey;
4ed75de5
KG		 145 struct smc_llc_msg_delete_rkey delete_rkey;
146
313164da 147 struct smc_llc_msg_test_link test_link;
0f627126
SR		 148 struct {
149 struct smc_llc_hdr hdr;
150 u8 data[SMC_LLC_DATA_LEN];
151 } raw;
152};
153
154#define SMC_LLC_FLAG_RESP 0x80
155
6c8968c4
KG		 156struct smc_llc_qentry {
157 struct list_head list;
158 struct smc_link *link;
159 union smc_llc_msg msg;
160};
161
4dadd151
KG		 162static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc);
163
555da9af
KG		 164struct smc_llc_qentry *smc_llc_flow_qentry_clr(struct smc_llc_flow *flow)
165{
166 struct smc_llc_qentry *qentry = flow->qentry;
167
168 flow->qentry = NULL;
169 return qentry;
170}
171
172void smc_llc_flow_qentry_del(struct smc_llc_flow *flow)
173{
174 struct smc_llc_qentry *qentry;
175
176 if (flow->qentry) {
177 qentry = flow->qentry;
178 flow->qentry = NULL;
179 kfree(qentry);
180 }
181}
182
183static inline void smc_llc_flow_qentry_set(struct smc_llc_flow *flow,
184 struct smc_llc_qentry *qentry)
185{
186 flow->qentry = qentry;
187}
188
189/* try to start a new llc flow, initiated by an incoming llc msg */
190static bool smc_llc_flow_start(struct smc_llc_flow *flow,
191 struct smc_llc_qentry *qentry)
192{
193 struct smc_link_group *lgr = qentry->link->lgr;
194
195 spin_lock_bh(&lgr->llc_flow_lock);
196 if (flow->type) {
197 /* a flow is already active */
198 if ((qentry->msg.raw.hdr.common.type == SMC_LLC_ADD_LINK ||
199 qentry->msg.raw.hdr.common.type == SMC_LLC_DELETE_LINK) &&
200 !lgr->delayed_event) {
201 lgr->delayed_event = qentry;
202 } else {
203 /* forget this llc request */
204 kfree(qentry);
205 }
206 spin_unlock_bh(&lgr->llc_flow_lock);
207 return false;
208 }
209 switch (qentry->msg.raw.hdr.common.type) {
210 case SMC_LLC_ADD_LINK:
211 flow->type = SMC_LLC_FLOW_ADD_LINK;
212 break;
213 case SMC_LLC_DELETE_LINK:
214 flow->type = SMC_LLC_FLOW_DEL_LINK;
215 break;
216 case SMC_LLC_CONFIRM_RKEY:
217 case SMC_LLC_DELETE_RKEY:
218 flow->type = SMC_LLC_FLOW_RKEY;
219 break;
220 default:
221 flow->type = SMC_LLC_FLOW_NONE;
222 }
223 if (qentry == lgr->delayed_event)
224 lgr->delayed_event = NULL;
225 spin_unlock_bh(&lgr->llc_flow_lock);
226 smc_llc_flow_qentry_set(flow, qentry);
227 return true;
228}
229
230/* start a new local llc flow, wait till current flow finished */
231int smc_llc_flow_initiate(struct smc_link_group *lgr,
232 enum smc_llc_flowtype type)
233{
234 enum smc_llc_flowtype allowed_remote = SMC_LLC_FLOW_NONE;
235 int rc;
236
237 /* all flows except confirm_rkey and delete_rkey are exclusive,
238 * confirm/delete rkey flows can run concurrently (local and remote)
239 */
240 if (type == SMC_LLC_FLOW_RKEY)
241 allowed_remote = SMC_LLC_FLOW_RKEY;
242again:
243 if (list_empty(&lgr->list))
244 return -ENODEV;
245 spin_lock_bh(&lgr->llc_flow_lock);
246 if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE &&
247 (lgr->llc_flow_rmt.type == SMC_LLC_FLOW_NONE ||
248 lgr->llc_flow_rmt.type == allowed_remote)) {
249 lgr->llc_flow_lcl.type = type;
250 spin_unlock_bh(&lgr->llc_flow_lock);
251 return 0;
252 }
253 spin_unlock_bh(&lgr->llc_flow_lock);
254 rc = wait_event_interruptible_timeout(lgr->llc_waiter,
255 (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE &&
256 (lgr->llc_flow_rmt.type == SMC_LLC_FLOW_NONE ||
257 lgr->llc_flow_rmt.type == allowed_remote)),
258 SMC_LLC_WAIT_TIME);
259 if (!rc)
260 return -ETIMEDOUT;
261 goto again;
262}
263
264/* finish the current llc flow */
265void smc_llc_flow_stop(struct smc_link_group *lgr, struct smc_llc_flow *flow)
266{
267 spin_lock_bh(&lgr->llc_flow_lock);
268 memset(flow, 0, sizeof(*flow));
269 flow->type = SMC_LLC_FLOW_NONE;
270 spin_unlock_bh(&lgr->llc_flow_lock);
271 if (!list_empty(&lgr->list) && lgr->delayed_event &&
272 flow == &lgr->llc_flow_lcl)
273 schedule_work(&lgr->llc_event_work);
274 else
275 wake_up_interruptible(&lgr->llc_waiter);
276}
277
278/* lnk is optional and used for early wakeup when link goes down, useful in
279 * cases where we wait for a response on the link after we sent a request
280 */
281struct smc_llc_qentry *smc_llc_wait(struct smc_link_group *lgr,
282 struct smc_link *lnk,
283 int time_out, u8 exp_msg)
284{
285 struct smc_llc_flow *flow = &lgr->llc_flow_lcl;
286
287 wait_event_interruptible_timeout(lgr->llc_waiter,
288 (flow->qentry ||
289 (lnk && !smc_link_usable(lnk)) ||
290 list_empty(&lgr->list)),
291 time_out);
292 if (!flow->qentry ||
293 (lnk && !smc_link_usable(lnk)) || list_empty(&lgr->list)) {
294 smc_llc_flow_qentry_del(flow);
295 goto out;
296 }
297 if (exp_msg && flow->qentry->msg.raw.hdr.common.type != exp_msg) {
298 if (exp_msg == SMC_LLC_ADD_LINK &&
299 flow->qentry->msg.raw.hdr.common.type ==
300 SMC_LLC_DELETE_LINK) {
301 /* flow_start will delay the unexpected msg */
302 smc_llc_flow_start(&lgr->llc_flow_lcl,
303 smc_llc_flow_qentry_clr(flow));
304 return NULL;
305 }
306 smc_llc_flow_qentry_del(flow);
307 }
308out:
309 return flow->qentry;
310}
311
9bf9abea
UB		 312/********************************** send *************************************/
313
314struct smc_llc_tx_pend {
315};
316
317/* handler for send/transmission completion of an LLC msg */
318static void smc_llc_tx_handler(struct smc_wr_tx_pend_priv *pend,
319 struct smc_link *link,
320 enum ib_wc_status wc_status)
321{
322 /* future work: handle wc_status error for recovery and failover */
323}
324
325/**
326 * smc_llc_add_pending_send() - add LLC control message to pending WQE transmits
327 * @link: Pointer to SMC link used for sending LLC control message.
328 * @wr_buf: Out variable returning pointer to work request payload buffer.
329 * @pend: Out variable returning pointer to private pending WR tracking.
330 * It's the context the transmit complete handler will get.
331 *
332 * Reserves and pre-fills an entry for a pending work request send/tx.
333 * Used by mid-level smc_llc_send_msg() to prepare for later actual send/tx.
334 * Can sleep due to smc_get_ctrl_buf (if not in softirq context).
335 *
336 * Return: 0 on success, otherwise an error value.
337 */
338static int smc_llc_add_pending_send(struct smc_link *link,
339 struct smc_wr_buf **wr_buf,
340 struct smc_wr_tx_pend_priv **pend)
341{
342 int rc;
343
ad6f317f
UB		 344 rc = smc_wr_tx_get_free_slot(link, smc_llc_tx_handler, wr_buf, NULL,
345 pend);
9bf9abea
UB		 346 if (rc < 0)
347 return rc;
348 BUILD_BUG_ON_MSG(
349 sizeof(union smc_llc_msg) > SMC_WR_BUF_SIZE,
350 "must increase SMC_WR_BUF_SIZE to at least sizeof(struct smc_llc_msg)");
351 BUILD_BUG_ON_MSG(
352 sizeof(union smc_llc_msg) != SMC_WR_TX_SIZE,
353 "must adapt SMC_WR_TX_SIZE to sizeof(struct smc_llc_msg); if not all smc_wr upper layer protocols use the same message size any more, must start to set link->wr_tx_sges[i].length on each individual smc_wr_tx_send()");
354 BUILD_BUG_ON_MSG(
355 sizeof(struct smc_llc_tx_pend) > SMC_WR_TX_PEND_PRIV_SIZE,
356 "must increase SMC_WR_TX_PEND_PRIV_SIZE to at least sizeof(struct smc_llc_tx_pend)");
357 return 0;
358}
359
360/* high-level API to send LLC confirm link */
947541f3 361int smc_llc_send_confirm_link(struct smc_link *link,
9bf9abea
UB		 362 enum smc_llc_reqresp reqresp)
363{
00e5fb26 364 struct smc_link_group *lgr = smc_get_lgr(link);
9bf9abea
UB		 365 struct smc_llc_msg_confirm_link *confllc;
366 struct smc_wr_tx_pend_priv *pend;
367 struct smc_wr_buf *wr_buf;
368 int rc;
369
370 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
371 if (rc)
372 return rc;
373 confllc = (struct smc_llc_msg_confirm_link *)wr_buf;
374 memset(confllc, 0, sizeof(*confllc));
375 confllc->hd.common.type = SMC_LLC_CONFIRM_LINK;
376 confllc->hd.length = sizeof(struct smc_llc_msg_confirm_link);
75d320d6 377 confllc->hd.flags |= SMC_LLC_FLAG_NO_RMBE_EYEC;
9bf9abea
UB		 378 if (reqresp == SMC_LLC_RESP)
379 confllc->hd.flags |= SMC_LLC_FLAG_RESP;
947541f3
UB		 380 memcpy(confllc->sender_mac, link->smcibdev->mac[link->ibport - 1],
381 ETH_ALEN);
7005ada6 382 memcpy(confllc->sender_gid, link->gid, SMC_GID_SIZE);
9bf9abea 383 hton24(confllc->sender_qp_num, link->roce_qp->qp_num);
2be922f3 384 confllc->link_num = link->link_id;
9bf9abea 385 memcpy(confllc->link_uid, lgr->id, SMC_LGR_ID_SIZE);
b1570a87 386 confllc->max_links = SMC_LLC_ADD_LNK_MAX_LINKS;
52bedf37
KG		 387 /* send llc message */
388 rc = smc_wr_tx_send(link, pend);
389 return rc;
390}
391
44aa81ce 392/* send LLC confirm rkey request */
3d88a21b 393static int smc_llc_send_confirm_rkey(struct smc_link *send_link,
44aa81ce
KG		 394 struct smc_buf_desc *rmb_desc)
395{
396 struct smc_llc_msg_confirm_rkey *rkeyllc;
397 struct smc_wr_tx_pend_priv *pend;
398 struct smc_wr_buf *wr_buf;
3d88a21b
KG		 399 struct smc_link *link;
400 int i, rc, rtok_ix;
44aa81ce 401
3d88a21b 402 rc = smc_llc_add_pending_send(send_link, &wr_buf, &pend);
44aa81ce
KG		 403 if (rc)
404 return rc;
405 rkeyllc = (struct smc_llc_msg_confirm_rkey *)wr_buf;
406 memset(rkeyllc, 0, sizeof(*rkeyllc));
407 rkeyllc->hd.common.type = SMC_LLC_CONFIRM_RKEY;
408 rkeyllc->hd.length = sizeof(struct smc_llc_msg_confirm_rkey);
3d88a21b
KG		 409
410 rtok_ix = 1;
411 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
412 link = &send_link->lgr->lnk[i];
413 if (link->state == SMC_LNK_ACTIVE && link != send_link) {
414 rkeyllc->rtoken[rtok_ix].link_id = link->link_id;
415 rkeyllc->rtoken[rtok_ix].rmb_key =
416 htonl(rmb_desc->mr_rx[link->link_idx]->rkey);
417 rkeyllc->rtoken[rtok_ix].rmb_vaddr = cpu_to_be64(
418 (u64)sg_dma_address(
419 rmb_desc->sgt[link->link_idx].sgl));
420 rtok_ix++;
421 }
422 }
423 /* rkey of send_link is in rtoken[0] */
424 rkeyllc->rtoken[0].num_rkeys = rtok_ix - 1;
44aa81ce 425 rkeyllc->rtoken[0].rmb_key =
3d88a21b 426 htonl(rmb_desc->mr_rx[send_link->link_idx]->rkey);
44aa81ce 427 rkeyllc->rtoken[0].rmb_vaddr = cpu_to_be64(
3d88a21b 428 (u64)sg_dma_address(rmb_desc->sgt[send_link->link_idx].sgl));
44aa81ce 429 /* send llc message */
3d88a21b 430 rc = smc_wr_tx_send(send_link, pend);
44aa81ce
KG		 431 return rc;
432}
433
60e03c62
KG		 434/* send LLC delete rkey request */
435static int smc_llc_send_delete_rkey(struct smc_link *link,
436 struct smc_buf_desc *rmb_desc)
437{
438 struct smc_llc_msg_delete_rkey *rkeyllc;
439 struct smc_wr_tx_pend_priv *pend;
440 struct smc_wr_buf *wr_buf;
441 int rc;
442
443 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
444 if (rc)
445 return rc;
446 rkeyllc = (struct smc_llc_msg_delete_rkey *)wr_buf;
447 memset(rkeyllc, 0, sizeof(*rkeyllc));
448 rkeyllc->hd.common.type = SMC_LLC_DELETE_RKEY;
449 rkeyllc->hd.length = sizeof(struct smc_llc_msg_delete_rkey);
450 rkeyllc->num_rkeys = 1;
387707fd 451 rkeyllc->rkey[0] = htonl(rmb_desc->mr_rx[link->link_idx]->rkey);
60e03c62
KG		 452 /* send llc message */
453 rc = smc_wr_tx_send(link, pend);
454 return rc;
455}
456
52bedf37 457/* send ADD LINK request or response */
7005ada6 458int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
fbed3b37 459 struct smc_link *link_new,
52bedf37
KG		 460 enum smc_llc_reqresp reqresp)
461{
462 struct smc_llc_msg_add_link *addllc;
463 struct smc_wr_tx_pend_priv *pend;
464 struct smc_wr_buf *wr_buf;
465 int rc;
466
467 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
468 if (rc)
469 return rc;
470 addllc = (struct smc_llc_msg_add_link *)wr_buf;
fbed3b37
KG		 471
472 memset(addllc, 0, sizeof(*addllc));
473 addllc->hd.common.type = SMC_LLC_ADD_LINK;
474 addllc->hd.length = sizeof(struct smc_llc_msg_add_link);
475 if (reqresp == SMC_LLC_RESP)
476 addllc->hd.flags |= SMC_LLC_FLAG_RESP;
477 memcpy(addllc->sender_mac, mac, ETH_ALEN);
478 memcpy(addllc->sender_gid, gid, SMC_GID_SIZE);
479 if (link_new) {
480 addllc->link_num = link_new->link_id;
481 hton24(addllc->sender_qp_num, link_new->roce_qp->qp_num);
482 hton24(addllc->initial_psn, link_new->psn_initial);
483 if (reqresp == SMC_LLC_REQ)
484 addllc->qp_mtu = link_new->path_mtu;
485 else
486 addllc->qp_mtu = min(link_new->path_mtu,
487 link_new->peer_mtu);
488 }
52bedf37
KG		 489 /* send llc message */
490 rc = smc_wr_tx_send(link, pend);
491 return rc;
492}
493
494/* send DELETE LINK request or response */
fbed3b37
KG		 495int smc_llc_send_delete_link(struct smc_link *link, u8 link_del_id,
496 enum smc_llc_reqresp reqresp, bool orderly,
497 u32 reason)
52bedf37
KG		 498{
499 struct smc_llc_msg_del_link *delllc;
500 struct smc_wr_tx_pend_priv *pend;
501 struct smc_wr_buf *wr_buf;
502 int rc;
503
504 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
505 if (rc)
506 return rc;
507 delllc = (struct smc_llc_msg_del_link *)wr_buf;
fbed3b37
KG		 508
509 memset(delllc, 0, sizeof(*delllc));
510 delllc->hd.common.type = SMC_LLC_DELETE_LINK;
511 delllc->hd.length = sizeof(struct smc_llc_msg_del_link);
512 if (reqresp == SMC_LLC_RESP)
513 delllc->hd.flags |= SMC_LLC_FLAG_RESP;
514 if (orderly)
515 delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
516 if (link_del_id)
517 delllc->link_num = link_del_id;
518 else
519 delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
520 delllc->reason = htonl(reason);
9bf9abea
UB		 521 /* send llc message */
522 rc = smc_wr_tx_send(link, pend);
523 return rc;
524}
525
d97935fa
KG		 526/* send LLC test link request */
527static int smc_llc_send_test_link(struct smc_link *link, u8 user_data[16])
313164da
KG		 528{
529 struct smc_llc_msg_test_link *testllc;
530 struct smc_wr_tx_pend_priv *pend;
531 struct smc_wr_buf *wr_buf;
532 int rc;
533
534 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
535 if (rc)
536 return rc;
537 testllc = (struct smc_llc_msg_test_link *)wr_buf;
538 memset(testllc, 0, sizeof(*testllc));
539 testllc->hd.common.type = SMC_LLC_TEST_LINK;
540 testllc->hd.length = sizeof(struct smc_llc_msg_test_link);
313164da
KG		 541 memcpy(testllc->user_data, user_data, sizeof(testllc->user_data));
542 /* send llc message */
543 rc = smc_wr_tx_send(link, pend);
544 return rc;
545}
546
6c8968c4
KG		 547/* schedule an llc send on link, may wait for buffers */
548static int smc_llc_send_message(struct smc_link *link, void *llcbuf)
4ed75de5
KG		 549{
550 struct smc_wr_tx_pend_priv *pend;
551 struct smc_wr_buf *wr_buf;
552 int rc;
553
6c8968c4
KG		 554 if (!smc_link_usable(link))
555 return -ENOLINK;
556 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
4ed75de5 557 if (rc)
6c8968c4
KG		 558 return rc;
559 memcpy(wr_buf, llcbuf, sizeof(union smc_llc_msg));
560 return smc_wr_tx_send(link, pend);
4ed75de5
KG		 561}
562
9bf9abea
UB		 563/********************************* receive ***********************************/
564
336ba09f
KG		 565static int smc_llc_alloc_alt_link(struct smc_link_group *lgr,
566 enum smc_lgr_type lgr_new_t)
567{
568 int i;
569
570 if (lgr->type == SMC_LGR_SYMMETRIC ||
571 (lgr->type != SMC_LGR_SINGLE &&
572 (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
573 lgr_new_t == SMC_LGR_ASYMMETRIC_PEER)))
574 return -EMLINK;
575
576 if (lgr_new_t == SMC_LGR_ASYMMETRIC_LOCAL ||
577 lgr_new_t == SMC_LGR_ASYMMETRIC_PEER) {
578 for (i = SMC_LINKS_PER_LGR_MAX - 1; i >= 0; i--)
579 if (lgr->lnk[i].state == SMC_LNK_UNUSED)
580 return i;
581 } else {
582 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
583 if (lgr->lnk[i].state == SMC_LNK_UNUSED)
584 return i;
585 }
586 return -EMLINK;
587}
588
87f88cda
KG		 589/* return first buffer from any of the next buf lists */
590static struct smc_buf_desc *_smc_llc_get_next_rmb(struct smc_link_group *lgr,
591 int *buf_lst)
592{
593 struct smc_buf_desc *buf_pos;
594
595 while (*buf_lst < SMC_RMBE_SIZES) {
596 buf_pos = list_first_entry_or_null(&lgr->rmbs[*buf_lst],
597 struct smc_buf_desc, list);
598 if (buf_pos)
599 return buf_pos;
600 (*buf_lst)++;
601 }
602 return NULL;
603}
604
605/* return next rmb from buffer lists */
606static struct smc_buf_desc *smc_llc_get_next_rmb(struct smc_link_group *lgr,
607 int *buf_lst,
608 struct smc_buf_desc *buf_pos)
609{
610 struct smc_buf_desc *buf_next;
611
612 if (!buf_pos || list_is_last(&buf_pos->list, &lgr->rmbs[*buf_lst])) {
613 (*buf_lst)++;
614 return _smc_llc_get_next_rmb(lgr, buf_lst);
615 }
616 buf_next = list_next_entry(buf_pos, list);
617 return buf_next;
618}
619
620static struct smc_buf_desc *smc_llc_get_first_rmb(struct smc_link_group *lgr,
621 int *buf_lst)
622{
623 *buf_lst = 0;
624 return smc_llc_get_next_rmb(lgr, buf_lst, NULL);
625}
626
627/* send one add_link_continue msg */
628static int smc_llc_add_link_cont(struct smc_link *link,
629 struct smc_link *link_new, u8 *num_rkeys_todo,
630 int *buf_lst, struct smc_buf_desc **buf_pos)
631{
632 struct smc_llc_msg_add_link_cont *addc_llc;
633 struct smc_link_group *lgr = link->lgr;
634 int prim_lnk_idx, lnk_idx, i, rc;
635 struct smc_wr_tx_pend_priv *pend;
636 struct smc_wr_buf *wr_buf;
637 struct smc_buf_desc *rmb;
638 u8 n;
639
640 rc = smc_llc_add_pending_send(link, &wr_buf, &pend);
641 if (rc)
642 return rc;
643 addc_llc = (struct smc_llc_msg_add_link_cont *)wr_buf;
644 memset(addc_llc, 0, sizeof(*addc_llc));
645
646 prim_lnk_idx = link->link_idx;
647 lnk_idx = link_new->link_idx;
648 addc_llc->link_num = link_new->link_id;
649 addc_llc->num_rkeys = *num_rkeys_todo;
650 n = *num_rkeys_todo;
651 for (i = 0; i < min_t(u8, n, SMC_LLC_RKEYS_PER_CONT_MSG); i++) {
652 if (!*buf_pos) {
653 addc_llc->num_rkeys = addc_llc->num_rkeys -
654 *num_rkeys_todo;
655 *num_rkeys_todo = 0;
656 break;
657 }
658 rmb = *buf_pos;
659
660 addc_llc->rt[i].rmb_key = htonl(rmb->mr_rx[prim_lnk_idx]->rkey);
661 addc_llc->rt[i].rmb_key_new = htonl(rmb->mr_rx[lnk_idx]->rkey);
662 addc_llc->rt[i].rmb_vaddr_new =
663 cpu_to_be64((u64)sg_dma_address(rmb->sgt[lnk_idx].sgl));
664
665 (*num_rkeys_todo)--;
666 *buf_pos = smc_llc_get_next_rmb(lgr, buf_lst, *buf_pos);
667 while (*buf_pos && !(*buf_pos)->used)
668 *buf_pos = smc_llc_get_next_rmb(lgr, buf_lst, *buf_pos);
669 }
670 addc_llc->hd.common.type = SMC_LLC_ADD_LINK_CONT;
671 addc_llc->hd.length = sizeof(struct smc_llc_msg_add_link_cont);
672 if (lgr->role == SMC_CLNT)
673 addc_llc->hd.flags |= SMC_LLC_FLAG_RESP;
674 return smc_wr_tx_send(link, pend);
675}
676
677static int smc_llc_cli_rkey_exchange(struct smc_link *link,
678 struct smc_link *link_new)
679{
680 struct smc_llc_msg_add_link_cont *addc_llc;
681 struct smc_link_group *lgr = link->lgr;
682 u8 max, num_rkeys_send, num_rkeys_recv;
683 struct smc_llc_qentry *qentry;
684 struct smc_buf_desc *buf_pos;
685 int buf_lst;
686 int rc = 0;
687 int i;
688
689 mutex_lock(&lgr->rmbs_lock);
690 num_rkeys_send = lgr->conns_num;
691 buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);
692 do {
693 qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_TIME,
694 SMC_LLC_ADD_LINK_CONT);
695 if (!qentry) {
696 rc = -ETIMEDOUT;
697 break;
698 }
699 addc_llc = &qentry->msg.add_link_cont;
700 num_rkeys_recv = addc_llc->num_rkeys;
701 max = min_t(u8, num_rkeys_recv, SMC_LLC_RKEYS_PER_CONT_MSG);
702 for (i = 0; i < max; i++) {
703 smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,
704 addc_llc->rt[i].rmb_key,
705 addc_llc->rt[i].rmb_vaddr_new,
706 addc_llc->rt[i].rmb_key_new);
707 num_rkeys_recv--;
708 }
709 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
710 rc = smc_llc_add_link_cont(link, link_new, &num_rkeys_send,
711 &buf_lst, &buf_pos);
712 if (rc)
713 break;
714 } while (num_rkeys_send || num_rkeys_recv);
715
716 mutex_unlock(&lgr->rmbs_lock);
717 return rc;
718}
719
336ba09f
KG		 720/* prepare and send an add link reject response */
721static int smc_llc_cli_add_link_reject(struct smc_llc_qentry *qentry)
722{
723 qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
724 qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_ADD_LNK_REJ;
725 qentry->msg.raw.hdr.add_link_rej_rsn = SMC_LLC_REJ_RSN_NO_ALT_PATH;
726 return smc_llc_send_message(qentry->link, &qentry->msg);
727}
728
b1570a87
KG		 729static int smc_llc_cli_conf_link(struct smc_link *link,
730 struct smc_init_info *ini,
731 struct smc_link *link_new,
732 enum smc_lgr_type lgr_new_t)
733{
734 struct smc_link_group *lgr = link->lgr;
735 struct smc_llc_msg_del_link *del_llc;
736 struct smc_llc_qentry *qentry = NULL;
737 int rc = 0;
738
739 /* receive CONFIRM LINK request over RoCE fabric */
740 qentry = smc_llc_wait(lgr, NULL, SMC_LLC_WAIT_FIRST_TIME, 0);
741 if (!qentry) {
742 rc = smc_llc_send_delete_link(link, link_new->link_id,
743 SMC_LLC_REQ, false,
744 SMC_LLC_DEL_LOST_PATH);
745 return -ENOLINK;
746 }
747 if (qentry->msg.raw.hdr.common.type != SMC_LLC_CONFIRM_LINK) {
748 /* received DELETE_LINK instead */
749 del_llc = &qentry->msg.delete_link;
750 qentry->msg.raw.hdr.flags |= SMC_LLC_FLAG_RESP;
751 smc_llc_send_message(link, &qentry->msg);
752 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
753 return -ENOLINK;
754 }
755 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
756
757 rc = smc_ib_modify_qp_rts(link_new);
758 if (rc) {
759 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
760 false, SMC_LLC_DEL_LOST_PATH);
761 return -ENOLINK;
762 }
763 smc_wr_remember_qp_attr(link_new);
764
765 rc = smcr_buf_reg_lgr(link_new);
766 if (rc) {
767 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
768 false, SMC_LLC_DEL_LOST_PATH);
769 return -ENOLINK;
770 }
771
772 /* send CONFIRM LINK response over RoCE fabric */
773 rc = smc_llc_send_confirm_link(link_new, SMC_LLC_RESP);
774 if (rc) {
775 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
776 false, SMC_LLC_DEL_LOST_PATH);
777 return -ENOLINK;
778 }
779 smc_llc_link_active(link_new);
780 lgr->type = lgr_new_t;
781 return 0;
782}
783
336ba09f
KG		 784static void smc_llc_save_add_link_info(struct smc_link *link,
785 struct smc_llc_msg_add_link *add_llc)
786{
787 link->peer_qpn = ntoh24(add_llc->sender_qp_num);
788 memcpy(link->peer_gid, add_llc->sender_gid, SMC_GID_SIZE);
789 memcpy(link->peer_mac, add_llc->sender_mac, ETH_ALEN);
790 link->peer_psn = ntoh24(add_llc->initial_psn);
791 link->peer_mtu = add_llc->qp_mtu;
792}
793
794/* as an SMC client, process an add link request */
795int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
796{
797 struct smc_llc_msg_add_link *llc = &qentry->msg.add_link;
798 enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
799 struct smc_link_group *lgr = smc_get_lgr(link);
800 struct smc_link *lnk_new = NULL;
801 struct smc_init_info ini;
802 int lnk_idx, rc = 0;
803
804 ini.vlan_id = lgr->vlan_id;
805 smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
806 if (!memcmp(llc->sender_gid, link->peer_gid, SMC_GID_SIZE) &&
807 !memcmp(llc->sender_mac, link->peer_mac, ETH_ALEN)) {
808 if (!ini.ib_dev)
809 goto out_reject;
810 lgr_new_t = SMC_LGR_ASYMMETRIC_PEER;
811 }
812 if (!ini.ib_dev) {
813 lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
814 ini.ib_dev = link->smcibdev;
815 ini.ib_port = link->ibport;
816 }
817 lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
818 if (lnk_idx < 0)
819 goto out_reject;
820 lnk_new = &lgr->lnk[lnk_idx];
821 rc = smcr_link_init(lgr, lnk_new, lnk_idx, &ini);
822 if (rc)
823 goto out_reject;
824 smc_llc_save_add_link_info(lnk_new, llc);
825 lnk_new->link_id = llc->link_num;
826
827 rc = smc_ib_ready_link(lnk_new);
828 if (rc)
829 goto out_clear_lnk;
830
831 rc = smcr_buf_map_lgr(lnk_new);
832 if (rc)
833 goto out_clear_lnk;
834
835 rc = smc_llc_send_add_link(link,
836 lnk_new->smcibdev->mac[ini.ib_port - 1],
837 lnk_new->gid, lnk_new, SMC_LLC_RESP);
838 if (rc)
839 goto out_clear_lnk;
87f88cda 840 rc = smc_llc_cli_rkey_exchange(link, lnk_new);
336ba09f
KG		 841 if (rc) {
842 rc = 0;
843 goto out_clear_lnk;
844 }
b1570a87 845 rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t);
336ba09f
KG		 846 if (!rc)
847 goto out;
848out_clear_lnk:
849 smcr_link_clear(lnk_new);
850out_reject:
851 smc_llc_cli_add_link_reject(qentry);
852out:
853 kfree(qentry);
854 return rc;
855}
856
b1570a87
KG		 857static void smc_llc_process_cli_add_link(struct smc_link_group *lgr)
858{
859 struct smc_llc_qentry *qentry;
860
861 qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
862
863 mutex_lock(&lgr->llc_conf_mutex);
864 smc_llc_cli_add_link(qentry->link, qentry);
865 mutex_unlock(&lgr->llc_conf_mutex);
866}
867
9c416878
KG		 868static int smc_llc_active_link_count(struct smc_link_group *lgr)
869{
870 int i, link_count = 0;
871
872 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
873 if (!smc_link_usable(&lgr->lnk[i]))
874 continue;
875 link_count++;
876 }
877 return link_count;
878}
879
c9a5d243
KG		 880/* find the asymmetric link when 3 links are established */
881static struct smc_link *smc_llc_find_asym_link(struct smc_link_group *lgr)
882{
883 int asym_idx = -ENOENT;
884 int i, j, k;
885 bool found;
886
887 /* determine asymmetric link */
888 found = false;
889 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
890 for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
891 if (!smc_link_usable(&lgr->lnk[i]) ||
892 !smc_link_usable(&lgr->lnk[j]))
893 continue;
894 if (!memcmp(lgr->lnk[i].gid, lgr->lnk[j].gid,
895 SMC_GID_SIZE)) {
896 found = true; /* asym_lnk is i or j */
897 break;
898 }
899 }
900 if (found)
901 break;
902 }
903 if (!found)
904 goto out; /* no asymmetric link */
905 for (k = 0; k < SMC_LINKS_PER_LGR_MAX; k++) {
906 if (!smc_link_usable(&lgr->lnk[k]))
907 continue;
908 if (k != i &&
909 !memcmp(lgr->lnk[i].peer_gid, lgr->lnk[k].peer_gid,
910 SMC_GID_SIZE)) {
911 asym_idx = i;
912 break;
913 }
914 if (k != j &&
915 !memcmp(lgr->lnk[j].peer_gid, lgr->lnk[k].peer_gid,
916 SMC_GID_SIZE)) {
917 asym_idx = j;
918 break;
919 }
920 }
921out:
922 return (asym_idx < 0) ? NULL : &lgr->lnk[asym_idx];
923}
924
925static void smc_llc_delete_asym_link(struct smc_link_group *lgr)
926{
927 struct smc_link *lnk_new = NULL, *lnk_asym;
928 struct smc_llc_qentry *qentry;
929 int rc;
930
931 lnk_asym = smc_llc_find_asym_link(lgr);
932 if (!lnk_asym)
933 return; /* no asymmetric link */
934 if (!smc_link_downing(&lnk_asym->state))
935 return;
c6f02ebe 936 lnk_new = smc_switch_conns(lgr, lnk_asym, false);
c9a5d243
KG		 937 smc_wr_tx_wait_no_pending_sends(lnk_asym);
938 if (!lnk_new)
939 goto out_free;
940 /* change flow type from ADD_LINK into DEL_LINK */
941 lgr->llc_flow_lcl.type = SMC_LLC_FLOW_DEL_LINK;
942 rc = smc_llc_send_delete_link(lnk_new, lnk_asym->link_id, SMC_LLC_REQ,
943 true, SMC_LLC_DEL_NO_ASYM_NEEDED);
944 if (rc) {
945 smcr_link_down_cond(lnk_new);
946 goto out_free;
947 }
948 qentry = smc_llc_wait(lgr, lnk_new, SMC_LLC_WAIT_TIME,
949 SMC_LLC_DELETE_LINK);
950 if (!qentry) {
951 smcr_link_down_cond(lnk_new);
952 goto out_free;
953 }
954 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
955out_free:
956 smcr_link_clear(lnk_asym);
957}
958
57b49924
KG		 959static int smc_llc_srv_rkey_exchange(struct smc_link *link,
960 struct smc_link *link_new)
961{
962 struct smc_llc_msg_add_link_cont *addc_llc;
963 struct smc_link_group *lgr = link->lgr;
964 u8 max, num_rkeys_send, num_rkeys_recv;
965 struct smc_llc_qentry *qentry = NULL;
966 struct smc_buf_desc *buf_pos;
967 int buf_lst;
968 int rc = 0;
969 int i;
970
971 mutex_lock(&lgr->rmbs_lock);
972 num_rkeys_send = lgr->conns_num;
973 buf_pos = smc_llc_get_first_rmb(lgr, &buf_lst);
974 do {
975 smc_llc_add_link_cont(link, link_new, &num_rkeys_send,
976 &buf_lst, &buf_pos);
977 qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME,
978 SMC_LLC_ADD_LINK_CONT);
979 if (!qentry) {
980 rc = -ETIMEDOUT;
981 goto out;
982 }
983 addc_llc = &qentry->msg.add_link_cont;
984 num_rkeys_recv = addc_llc->num_rkeys;
985 max = min_t(u8, num_rkeys_recv, SMC_LLC_RKEYS_PER_CONT_MSG);
986 for (i = 0; i < max; i++) {
987 smc_rtoken_set(lgr, link->link_idx, link_new->link_idx,
988 addc_llc->rt[i].rmb_key,
989 addc_llc->rt[i].rmb_vaddr_new,
990 addc_llc->rt[i].rmb_key_new);
991 num_rkeys_recv--;
992 }
993 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
994 } while (num_rkeys_send || num_rkeys_recv);
995out:
996 mutex_unlock(&lgr->rmbs_lock);
997 return rc;
998}
999
1551c95b
KG		 1000static int smc_llc_srv_conf_link(struct smc_link *link,
1001 struct smc_link *link_new,
1002 enum smc_lgr_type lgr_new_t)
1003{
1004 struct smc_link_group *lgr = link->lgr;
1005 struct smc_llc_qentry *qentry = NULL;
1006 int rc;
1007
1008 /* send CONFIRM LINK request over the RoCE fabric */
1009 rc = smc_llc_send_confirm_link(link_new, SMC_LLC_REQ);
1010 if (rc)
1011 return -ENOLINK;
1012 /* receive CONFIRM LINK response over the RoCE fabric */
1013 qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_FIRST_TIME,
1014 SMC_LLC_CONFIRM_LINK);
1015 if (!qentry) {
1016 /* send DELETE LINK */
1017 smc_llc_send_delete_link(link, link_new->link_id, SMC_LLC_REQ,
1018 false, SMC_LLC_DEL_LOST_PATH);
1019 return -ENOLINK;
1020 }
1021 smc_llc_link_active(link_new);
1022 lgr->type = lgr_new_t;
1023 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1024 return 0;
1025}
1026
2d2209f2
KG		 1027int smc_llc_srv_add_link(struct smc_link *link)
1028{
1029 enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
1030 struct smc_link_group *lgr = link->lgr;
1031 struct smc_llc_msg_add_link *add_llc;
1032 struct smc_llc_qentry *qentry = NULL;
1033 struct smc_link *link_new;
1034 struct smc_init_info ini;
1035 int lnk_idx, rc = 0;
1036
1037 /* ignore client add link recommendation, start new flow */
1038 ini.vlan_id = lgr->vlan_id;
1039 smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
1040 if (!ini.ib_dev) {
1041 lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
1042 ini.ib_dev = link->smcibdev;
1043 ini.ib_port = link->ibport;
1044 }
1045 lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
1046 if (lnk_idx < 0)
1047 return 0;
1048
1049 rc = smcr_link_init(lgr, &lgr->lnk[lnk_idx], lnk_idx, &ini);
1050 if (rc)
1051 return rc;
1052 link_new = &lgr->lnk[lnk_idx];
1053 rc = smc_llc_send_add_link(link,
1054 link_new->smcibdev->mac[ini.ib_port - 1],
1055 link_new->gid, link_new, SMC_LLC_REQ);
1056 if (rc)
1057 goto out_err;
1058 /* receive ADD LINK response over the RoCE fabric */
1059 qentry = smc_llc_wait(lgr, link, SMC_LLC_WAIT_TIME, SMC_LLC_ADD_LINK);
1060 if (!qentry) {
1061 rc = -ETIMEDOUT;
1062 goto out_err;
1063 }
1064 add_llc = &qentry->msg.add_link;
1065 if (add_llc->hd.flags & SMC_LLC_FLAG_ADD_LNK_REJ) {
1066 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1067 rc = -ENOLINK;
1068 goto out_err;
1069 }
1070 if (lgr->type == SMC_LGR_SINGLE &&
1071 (!memcmp(add_llc->sender_gid, link->peer_gid, SMC_GID_SIZE) &&
1072 !memcmp(add_llc->sender_mac, link->peer_mac, ETH_ALEN))) {
1073 lgr_new_t = SMC_LGR_ASYMMETRIC_PEER;
1074 }
1075 smc_llc_save_add_link_info(link_new, add_llc);
1076 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1077
1078 rc = smc_ib_ready_link(link_new);
1079 if (rc)
1080 goto out_err;
1081 rc = smcr_buf_map_lgr(link_new);
1082 if (rc)
1083 goto out_err;
1084 rc = smcr_buf_reg_lgr(link_new);
1085 if (rc)
1086 goto out_err;
57b49924 1087 rc = smc_llc_srv_rkey_exchange(link, link_new);
2d2209f2
KG		 1088 if (rc)
1089 goto out_err;
1551c95b 1090 rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t);
2d2209f2
KG		 1091 if (rc)
1092 goto out_err;
1093 return 0;
1094out_err:
1095 smcr_link_clear(link_new);
1096 return rc;
1097}
1098
1099static void smc_llc_process_srv_add_link(struct smc_link_group *lgr)
1100{
1101 struct smc_link *link = lgr->llc_flow_lcl.qentry->link;
1102 int rc;
1103
1104 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1105
1106 mutex_lock(&lgr->llc_conf_mutex);
1107 rc = smc_llc_srv_add_link(link);
1108 if (!rc && lgr->type == SMC_LGR_SYMMETRIC) {
1109 /* delete any asymmetric link */
c9a5d243 1110 smc_llc_delete_asym_link(lgr);
2d2209f2
KG		 1111 }
1112 mutex_unlock(&lgr->llc_conf_mutex);
1113}
1114
4dadd151
KG		 1115/* enqueue a local add_link req to trigger a new add_link flow, only as SERV */
1116void smc_llc_srv_add_link_local(struct smc_link *link)
1117{
1118 struct smc_llc_msg_add_link add_llc = {0};
1119
1120 add_llc.hd.length = sizeof(add_llc);
1121 add_llc.hd.common.type = SMC_LLC_ADD_LINK;
1122 /* no dev and port needed, we as server ignore client data anyway */
1123 smc_llc_enqueue(link, (union smc_llc_msg *)&add_llc);
1124}
1125
b45e7f98
KG		 1126/* worker to process an add link message */
1127static void smc_llc_add_link_work(struct work_struct *work)
1128{
1129 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
1130 llc_add_link_work);
1131
1132 if (list_empty(&lgr->list)) {
1133 /* link group is terminating */
1134 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1135 goto out;
1136 }
1137
b1570a87
KG		 1138 if (lgr->role == SMC_CLNT)
1139 smc_llc_process_cli_add_link(lgr);
2d2209f2
KG		 1140 else
1141 smc_llc_process_srv_add_link(lgr);
b45e7f98
KG		 1142out:
1143 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
1144}
1145
4dadd151
KG		 1146/* enqueue a local del_link msg to trigger a new del_link flow,
1147 * called only for role SMC_SERV
1148 */
1149void smc_llc_srv_delete_link_local(struct smc_link *link, u8 del_link_id)
1150{
1151 struct smc_llc_msg_del_link del_llc = {0};
1152
1153 del_llc.hd.length = sizeof(del_llc);
1154 del_llc.hd.common.type = SMC_LLC_DELETE_LINK;
1155 del_llc.link_num = del_link_id;
1156 del_llc.reason = htonl(SMC_LLC_DEL_LOST_PATH);
1157 del_llc.hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
1158 smc_llc_enqueue(link, (union smc_llc_msg *)&del_llc);
1159}
1160
9c416878
KG		 1161static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr)
1162{
1163 struct smc_link *lnk_del = NULL, *lnk_asym, *lnk;
1164 struct smc_llc_msg_del_link *del_llc;
1165 struct smc_llc_qentry *qentry;
1166 int active_links;
1167 int lnk_idx;
1168
1169 qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
1170 lnk = qentry->link;
1171 del_llc = &qentry->msg.delete_link;
1172
1173 if (del_llc->hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
1174 smc_lgr_terminate_sched(lgr);
1175 goto out;
1176 }
1177 mutex_lock(&lgr->llc_conf_mutex);
1178 /* delete single link */
1179 for (lnk_idx = 0; lnk_idx < SMC_LINKS_PER_LGR_MAX; lnk_idx++) {
1180 if (lgr->lnk[lnk_idx].link_id != del_llc->link_num)
1181 continue;
1182 lnk_del = &lgr->lnk[lnk_idx];
1183 break;
1184 }
1185 del_llc->hd.flags |= SMC_LLC_FLAG_RESP;
1186 if (!lnk_del) {
1187 /* link was not found */
1188 del_llc->reason = htonl(SMC_LLC_DEL_NOLNK);
1189 smc_llc_send_message(lnk, &qentry->msg);
1190 goto out_unlock;
1191 }
1192 lnk_asym = smc_llc_find_asym_link(lgr);
1193
1194 del_llc->reason = 0;
1195 smc_llc_send_message(lnk, &qentry->msg); /* response */
1196
1197 if (smc_link_downing(&lnk_del->state)) {
c6f02ebe 1198 smc_switch_conns(lgr, lnk_del, false);
9c416878
KG		 1199 smc_wr_tx_wait_no_pending_sends(lnk_del);
1200 }
1201 smcr_link_clear(lnk_del);
1202
1203 active_links = smc_llc_active_link_count(lgr);
1204 if (lnk_del == lnk_asym) {
1205 /* expected deletion of asym link, don't change lgr state */
1206 } else if (active_links == 1) {
1207 lgr->type = SMC_LGR_SINGLE;
1208 } else if (!active_links) {
1209 lgr->type = SMC_LGR_NONE;
1210 smc_lgr_terminate_sched(lgr);
1211 }
1212out_unlock:
1213 mutex_unlock(&lgr->llc_conf_mutex);
1214out:
1215 kfree(qentry);
1216}
1217
08ae27dd
KG		 1218static void smc_llc_process_srv_delete_link(struct smc_link_group *lgr)
1219{
1220 struct smc_llc_msg_del_link *del_llc;
1221 struct smc_link *lnk, *lnk_del;
1222 struct smc_llc_qentry *qentry;
1223 int active_links;
1224 int i;
1225
1226 mutex_lock(&lgr->llc_conf_mutex);
1227 qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
1228 lnk = qentry->link;
1229 del_llc = &qentry->msg.delete_link;
1230
1231 if (qentry->msg.delete_link.hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
1232 /* delete entire lgr */
1233 smc_lgr_terminate_sched(lgr);
1234 goto out;
1235 }
1236 /* delete single link */
1237 lnk_del = NULL;
1238 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
1239 if (lgr->lnk[i].link_id == del_llc->link_num) {
1240 lnk_del = &lgr->lnk[i];
1241 break;
1242 }
1243 }
1244 if (!lnk_del)
1245 goto out; /* asymmetric link already deleted */
1246
1247 if (smc_link_downing(&lnk_del->state)) {
c6f02ebe 1248 smc_switch_conns(lgr, lnk_del, false);
08ae27dd
KG		 1249 smc_wr_tx_wait_no_pending_sends(lnk_del);
1250 }
1251 if (!list_empty(&lgr->list)) {
1252 /* qentry is either a request from peer (send it back to
1253 * initiate the DELETE_LINK processing), or a locally
1254 * enqueued DELETE_LINK request (forward it)
1255 */
1256 if (!smc_llc_send_message(lnk, &qentry->msg)) {
1257 struct smc_llc_msg_del_link *del_llc_resp;
1258 struct smc_llc_qentry *qentry2;
1259
1260 qentry2 = smc_llc_wait(lgr, lnk, SMC_LLC_WAIT_TIME,
1261 SMC_LLC_DELETE_LINK);
1262 if (!qentry2) {
1263 } else {
1264 del_llc_resp = &qentry2->msg.delete_link;
1265 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1266 }
1267 }
1268 }
1269 smcr_link_clear(lnk_del);
1270
1271 active_links = smc_llc_active_link_count(lgr);
1272 if (active_links == 1) {
1273 lgr->type = SMC_LGR_SINGLE;
1274 } else if (!active_links) {
1275 lgr->type = SMC_LGR_NONE;
1276 smc_lgr_terminate_sched(lgr);
1277 }
1278
1279 if (lgr->type == SMC_LGR_SINGLE && !list_empty(&lgr->list)) {
1280 /* trigger setup of asymm alt link */
4dadd151 1281 smc_llc_srv_add_link_local(lnk);
08ae27dd
KG		 1282 }
1283out:
1284 mutex_unlock(&lgr->llc_conf_mutex);
1285 kfree(qentry);
1286}
1287
9ec6bf19 1288static void smc_llc_delete_link_work(struct work_struct *work)
52bedf37 1289{
9ec6bf19
KG		 1290 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
1291 llc_del_link_work);
52bedf37 1292
9ec6bf19
KG		 1293 if (list_empty(&lgr->list)) {
1294 /* link group is terminating */
1295 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
1296 goto out;
52bedf37 1297 }
9c416878
KG		 1298
1299 if (lgr->role == SMC_CLNT)
1300 smc_llc_process_cli_delete_link(lgr);
08ae27dd
KG		 1301 else
1302 smc_llc_process_srv_delete_link(lgr);
9ec6bf19
KG		 1303out:
1304 smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
52bedf37
KG		 1305}
1306
3bc67e09
KG		 1307/* process a confirm_rkey request from peer, remote flow */
1308static void smc_llc_rmt_conf_rkey(struct smc_link_group *lgr)
4ed75de5 1309{
3bc67e09
KG		 1310 struct smc_llc_msg_confirm_rkey *llc;
1311 struct smc_llc_qentry *qentry;
1312 struct smc_link *link;
1313 int num_entries;
1314 int rk_idx;
1315 int i;
1316
1317 qentry = lgr->llc_flow_rmt.qentry;
1318 llc = &qentry->msg.confirm_rkey;
1319 link = qentry->link;
1320
1321 num_entries = llc->rtoken[0].num_rkeys;
1322 /* first rkey entry is for receiving link */
1323 rk_idx = smc_rtoken_add(link,
1324 llc->rtoken[0].rmb_vaddr,
1325 llc->rtoken[0].rmb_key);
1326 if (rk_idx < 0)
1327 goto out_err;
1328
1329 for (i = 1; i <= min_t(u8, num_entries, SMC_LLC_RKEYS_PER_MSG - 1); i++)
1330 smc_rtoken_set2(lgr, rk_idx, llc->rtoken[i].link_id,
1331 llc->rtoken[i].rmb_vaddr,
1332 llc->rtoken[i].rmb_key);
1333 /* max links is 3 so there is no need to support conf_rkey_cont msgs */
1334 goto out;
1335out_err:
1336 llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
1337 llc->hd.flags |= SMC_LLC_FLAG_RKEY_RETRY;
1338out:
ef79d439 1339 llc->hd.flags |= SMC_LLC_FLAG_RESP;
3bc67e09
KG		 1340 smc_llc_send_message(link, &qentry->msg);
1341 smc_llc_flow_qentry_del(&lgr->llc_flow_rmt);
4ed75de5
KG		 1342}
1343
218b24fe
KG		 1344/* process a delete_rkey request from peer, remote flow */
1345static void smc_llc_rmt_delete_rkey(struct smc_link_group *lgr)
4ed75de5 1346{
218b24fe
KG		 1347 struct smc_llc_msg_delete_rkey *llc;
1348 struct smc_llc_qentry *qentry;
1349 struct smc_link *link;
4ed75de5
KG		 1350 u8 err_mask = 0;
1351 int i, max;
1352
218b24fe
KG		 1353 qentry = lgr->llc_flow_rmt.qentry;
1354 llc = &qentry->msg.delete_rkey;
1355 link = qentry->link;
1356
ef79d439
KG		 1357 max = min_t(u8, llc->num_rkeys, SMC_LLC_DEL_RKEY_MAX);
1358 for (i = 0; i < max; i++) {
1359 if (smc_rtoken_delete(link, llc->rkey[i]))
1360 err_mask |= 1 << (SMC_LLC_DEL_RKEY_MAX - 1 - i);
1361 }
ef79d439
KG		 1362 if (err_mask) {
1363 llc->hd.flags |= SMC_LLC_FLAG_RKEY_NEG;
1364 llc->err_mask = err_mask;
4ed75de5 1365 }
218b24fe
KG		 1366 llc->hd.flags |= SMC_LLC_FLAG_RESP;
1367 smc_llc_send_message(link, &qentry->msg);
1368 smc_llc_flow_qentry_del(&lgr->llc_flow_rmt);
1369}
ef79d439 1370
6c8968c4 1371/* flush the llc event queue */
00a049cf 1372static void smc_llc_event_flush(struct smc_link_group *lgr)
9bf9abea 1373{
6c8968c4
KG		 1374 struct smc_llc_qentry *qentry, *q;
1375
1376 spin_lock_bh(&lgr->llc_event_q_lock);
1377 list_for_each_entry_safe(qentry, q, &lgr->llc_event_q, list) {
1378 list_del_init(&qentry->list);
1379 kfree(qentry);
1380 }
1381 spin_unlock_bh(&lgr->llc_event_q_lock);
1382}
1383
1384static void smc_llc_event_handler(struct smc_llc_qentry *qentry)
1385{
1386 union smc_llc_msg *llc = &qentry->msg;
1387 struct smc_link *link = qentry->link;
0fb0b02b 1388 struct smc_link_group *lgr = link->lgr;
9bf9abea 1389
d854fcbf 1390 if (!smc_link_usable(link))
6c8968c4 1391 goto out;
313164da
KG		 1392
1393 switch (llc->raw.hdr.common.type) {
1394 case SMC_LLC_TEST_LINK:
56e8091c
KG		 1395 llc->test_link.hd.flags |= SMC_LLC_FLAG_RESP;
1396 smc_llc_send_message(link, llc);
313164da 1397 break;
52bedf37 1398 case SMC_LLC_ADD_LINK:
0fb0b02b
KG		 1399 if (list_empty(&lgr->list))
1400 goto out; /* lgr is terminating */
1401 if (lgr->role == SMC_CLNT) {
1402 if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK) {
1403 /* a flow is waiting for this message */
1404 smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
1405 qentry);
1406 wake_up_interruptible(&lgr->llc_waiter);
1407 } else if (smc_llc_flow_start(&lgr->llc_flow_lcl,
1408 qentry)) {
b45e7f98 1409 schedule_work(&lgr->llc_add_link_work);
0fb0b02b
KG		 1410 }
1411 } else if (smc_llc_flow_start(&lgr->llc_flow_lcl, qentry)) {
1412 /* as smc server, handle client suggestion */
b45e7f98 1413 schedule_work(&lgr->llc_add_link_work);
0fb0b02b
KG		 1414 }
1415 return;
1416 case SMC_LLC_CONFIRM_LINK:
87f88cda 1417 case SMC_LLC_ADD_LINK_CONT:
0fb0b02b
KG		 1418 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1419 /* a flow is waiting for this message */
1420 smc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry);
1421 wake_up_interruptible(&lgr->llc_waiter);
1422 return;
1423 }
52bedf37
KG		 1424 break;
1425 case SMC_LLC_DELETE_LINK:
9ec6bf19
KG		 1426 if (lgr->role == SMC_CLNT) {
1427 /* server requests to delete this link, send response */
1428 if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
1429 /* DEL LINK REQ during ADD LINK SEQ */
1430 smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
1431 qentry);
1432 wake_up_interruptible(&lgr->llc_waiter);
1433 } else if (smc_llc_flow_start(&lgr->llc_flow_lcl,
1434 qentry)) {
1435 schedule_work(&lgr->llc_del_link_work);
1436 }
1437 } else {
1438 if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK &&
1439 !lgr->llc_flow_lcl.qentry) {
1440 /* DEL LINK REQ during ADD LINK SEQ */
1441 smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
1442 qentry);
1443 wake_up_interruptible(&lgr->llc_waiter);
1444 } else if (smc_llc_flow_start(&lgr->llc_flow_lcl,
1445 qentry)) {
1446 schedule_work(&lgr->llc_del_link_work);
1447 }
1448 }
1449 return;
4ed75de5 1450 case SMC_LLC_CONFIRM_RKEY:
3bc67e09
KG		 1451 /* new request from remote, assign to remote flow */
1452 if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) {
1453 /* process here, does not wait for more llc msgs */
1454 smc_llc_rmt_conf_rkey(lgr);
1455 smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt);
1456 }
1457 return;
4ed75de5 1458 case SMC_LLC_CONFIRM_RKEY_CONT:
42d18acc
KG		 1459 /* not used because max links is 3, and 3 rkeys fit into
1460 * one CONFIRM_RKEY message
1461 */
4ed75de5
KG		 1462 break;
1463 case SMC_LLC_DELETE_RKEY:
218b24fe
KG		 1464 /* new request from remote, assign to remote flow */
1465 if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) {
1466 /* process here, does not wait for more llc msgs */
1467 smc_llc_rmt_delete_rkey(lgr);
1468 smc_llc_flow_stop(lgr, &lgr->llc_flow_rmt);
1469 }
1470 return;
313164da 1471 }
6c8968c4
KG		 1472out:
1473 kfree(qentry);
1474}
1475
1476/* worker to process llc messages on the event queue */
1477static void smc_llc_event_work(struct work_struct *work)
1478{
1479 struct smc_link_group *lgr = container_of(work, struct smc_link_group,
1480 llc_event_work);
1481 struct smc_llc_qentry *qentry;
1482
555da9af
KG		 1483 if (!lgr->llc_flow_lcl.type && lgr->delayed_event) {
1484 if (smc_link_usable(lgr->delayed_event->link)) {
1485 smc_llc_event_handler(lgr->delayed_event);
1486 } else {
1487 qentry = lgr->delayed_event;
1488 lgr->delayed_event = NULL;
1489 kfree(qentry);
1490 }
1491 }
1492
6c8968c4
KG		 1493again:
1494 spin_lock_bh(&lgr->llc_event_q_lock);
1495 if (!list_empty(&lgr->llc_event_q)) {
1496 qentry = list_first_entry(&lgr->llc_event_q,
1497 struct smc_llc_qentry, list);
1498 list_del_init(&qentry->list);
1499 spin_unlock_bh(&lgr->llc_event_q_lock);
1500 smc_llc_event_handler(qentry);
1501 goto again;
1502 }
1503 spin_unlock_bh(&lgr->llc_event_q_lock);
1504}
1505
ef79d439 1506/* process llc responses in tasklet context */
a6688d91
KG		 1507static void smc_llc_rx_response(struct smc_link *link,
1508 struct smc_llc_qentry *qentry)
ef79d439 1509{
a6688d91 1510 u8 llc_type = qentry->msg.raw.hdr.common.type;
ef79d439 1511
a6688d91 1512 switch (llc_type) {
ef79d439
KG		 1513 case SMC_LLC_TEST_LINK:
1514 if (link->state == SMC_LNK_ACTIVE)
1515 complete(&link->llc_testlink_resp);
1516 break;
ef79d439 1517 case SMC_LLC_ADD_LINK:
9ec6bf19 1518 case SMC_LLC_DELETE_LINK:
4667bb4a 1519 case SMC_LLC_CONFIRM_LINK:
87f88cda 1520 case SMC_LLC_ADD_LINK_CONT:
3d88a21b 1521 case SMC_LLC_CONFIRM_RKEY:
6d74c3a8 1522 case SMC_LLC_DELETE_RKEY:
4667bb4a
KG		 1523 /* assign responses to the local flow, we requested them */
1524 smc_llc_flow_qentry_set(&link->lgr->llc_flow_lcl, qentry);
1525 wake_up_interruptible(&link->lgr->llc_waiter);
1526 return;
ef79d439 1527 case SMC_LLC_CONFIRM_RKEY_CONT:
42d18acc 1528 /* not used because max links is 3 */
ef79d439 1529 break;
ef79d439 1530 }
a6688d91 1531 kfree(qentry);
ef79d439
KG		 1532}
1533
a6688d91 1534static void smc_llc_enqueue(struct smc_link *link, union smc_llc_msg *llc)
6c8968c4 1535{
6c8968c4
KG		 1536 struct smc_link_group *lgr = link->lgr;
1537 struct smc_llc_qentry *qentry;
6c8968c4
KG		 1538 unsigned long flags;
1539
6c8968c4
KG		 1540 qentry = kmalloc(sizeof(*qentry), GFP_ATOMIC);
1541 if (!qentry)
1542 return;
1543 qentry->link = link;
1544 INIT_LIST_HEAD(&qentry->list);
1545 memcpy(&qentry->msg, llc, sizeof(union smc_llc_msg));
a6688d91
KG		 1546
1547 /* process responses immediately */
1548 if (llc->raw.hdr.flags & SMC_LLC_FLAG_RESP) {
1549 smc_llc_rx_response(link, qentry);
1550 return;
1551 }
1552
1553 /* add requests to event queue */
6c8968c4
KG		 1554 spin_lock_irqsave(&lgr->llc_event_q_lock, flags);
1555 list_add_tail(&qentry->list, &lgr->llc_event_q);
1556 spin_unlock_irqrestore(&lgr->llc_event_q_lock, flags);
1557 schedule_work(&link->lgr->llc_event_work);
9bf9abea
UB		 1558}
1559
a6688d91
KG		 1560/* copy received msg and add it to the event queue */
1561static void smc_llc_rx_handler(struct ib_wc *wc, void *buf)
1562{
1563 struct smc_link *link = (struct smc_link *)wc->qp->qp_context;
1564 union smc_llc_msg *llc = buf;
1565
1566 if (wc->byte_len < sizeof(*llc))
1567 return; /* short message */
1568 if (llc->raw.hdr.length != sizeof(*llc))
1569 return; /* invalid message */
1570
1571 smc_llc_enqueue(link, llc);
1572}
1573
44aa81ce 1574/***************************** worker, utils *********************************/
877ae5be
KG		 1575
1576static void smc_llc_testlink_work(struct work_struct *work)
1577{
1578 struct smc_link *link = container_of(to_delayed_work(work),
1579 struct smc_link, llc_testlink_wrk);
1580 unsigned long next_interval;
877ae5be
KG		 1581 unsigned long expire_time;
1582 u8 user_data[16] = { 0 };
1583 int rc;
1584
877ae5be
KG		 1585 if (link->state != SMC_LNK_ACTIVE)
1586 return; /* don't reschedule worker */
1587 expire_time = link->wr_rx_tstamp + link->llc_testlink_time;
1588 if (time_is_after_jiffies(expire_time)) {
1589 next_interval = expire_time - jiffies;
1590 goto out;
1591 }
1592 reinit_completion(&link->llc_testlink_resp);
d97935fa 1593 smc_llc_send_test_link(link, user_data);
877ae5be
KG		 1594 /* receive TEST LINK response over RoCE fabric */
1595 rc = wait_for_completion_interruptible_timeout(&link->llc_testlink_resp,
1596 SMC_LLC_WAIT_TIME);
1020e1ef
KG		 1597 if (link->state != SMC_LNK_ACTIVE)
1598 return; /* link state changed */
877ae5be 1599 if (rc <= 0) {
87523930 1600 smcr_link_down_cond_sched(link);
877ae5be
KG		 1601 return;
1602 }
1603 next_interval = link->llc_testlink_time;
1604out:
1020e1ef 1605 schedule_delayed_work(&link->llc_testlink_wrk, next_interval);
877ae5be
KG		 1606}
1607
00a049cf
KG		 1608void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc)
1609{
1610 struct net *net = sock_net(smc->clcsock->sk);
1611
1612 INIT_WORK(&lgr->llc_event_work, smc_llc_event_work);
b45e7f98 1613 INIT_WORK(&lgr->llc_add_link_work, smc_llc_add_link_work);
9ec6bf19 1614 INIT_WORK(&lgr->llc_del_link_work, smc_llc_delete_link_work);
00a049cf
KG		 1615 INIT_LIST_HEAD(&lgr->llc_event_q);
1616 spin_lock_init(&lgr->llc_event_q_lock);
555da9af
KG		 1617 spin_lock_init(&lgr->llc_flow_lock);
1618 init_waitqueue_head(&lgr->llc_waiter);
d5500667 1619 mutex_init(&lgr->llc_conf_mutex);
00a049cf
KG		 1620 lgr->llc_testlink_time = net->ipv4.sysctl_tcp_keepalive_time;
1621}
1622
1623/* called after lgr was removed from lgr_list */
1624void smc_llc_lgr_clear(struct smc_link_group *lgr)
1625{
1626 smc_llc_event_flush(lgr);
555da9af 1627 wake_up_interruptible_all(&lgr->llc_waiter);
00a049cf 1628 cancel_work_sync(&lgr->llc_event_work);
b45e7f98 1629 cancel_work_sync(&lgr->llc_add_link_work);
9ec6bf19 1630 cancel_work_sync(&lgr->llc_del_link_work);
555da9af
KG		 1631 if (lgr->delayed_event) {
1632 kfree(lgr->delayed_event);
1633 lgr->delayed_event = NULL;
1634 }
00a049cf
KG		 1635}
1636
2a4c57a9 1637int smc_llc_link_init(struct smc_link *link)
877ae5be
KG		 1638{
1639 init_completion(&link->llc_testlink_resp);
1640 INIT_DELAYED_WORK(&link->llc_testlink_wrk, smc_llc_testlink_work);
2a4c57a9 1641 return 0;
b32cf4ab
KG		 1642}
1643
00a049cf 1644void smc_llc_link_active(struct smc_link *link)
b32cf4ab 1645{
877ae5be 1646 link->state = SMC_LNK_ACTIVE;
00a049cf
KG		 1647 if (link->lgr->llc_testlink_time) {
1648 link->llc_testlink_time = link->lgr->llc_testlink_time * HZ;
1020e1ef
KG		 1649 schedule_delayed_work(&link->llc_testlink_wrk,
1650 link->llc_testlink_time);
877ae5be
KG		 1651 }
1652}
1653
877ae5be 1654/* called in worker context */
2a4c57a9 1655void smc_llc_link_clear(struct smc_link *link)
877ae5be 1656{
2140ac26
KG		 1657 complete(&link->llc_testlink_resp);
1658 cancel_delayed_work_sync(&link->llc_testlink_wrk);
1659 smc_wr_wakeup_reg_wait(link);
1660 smc_wr_wakeup_tx_wait(link);
877ae5be
KG		 1661}
1662
3d88a21b
KG		 1663/* register a new rtoken at the remote peer (for all links) */
1664int smc_llc_do_confirm_rkey(struct smc_link *send_link,
44aa81ce
KG		 1665 struct smc_buf_desc *rmb_desc)
1666{
3d88a21b
KG		 1667 struct smc_link_group *lgr = send_link->lgr;
1668 struct smc_llc_qentry *qentry = NULL;
1669 int rc = 0;
44aa81ce 1670
3d88a21b
KG		 1671 rc = smc_llc_send_confirm_rkey(send_link, rmb_desc);
1672 if (rc)
1673 goto out;
44aa81ce 1674 /* receive CONFIRM RKEY response from server over RoCE fabric */
3d88a21b
KG		 1675 qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME,
1676 SMC_LLC_CONFIRM_RKEY);
1677 if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG))
1678 rc = -EFAULT;
1679out:
1680 if (qentry)
1681 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
3d88a21b 1682 return rc;
44aa81ce
KG		 1683}
1684
60e03c62 1685/* unregister an rtoken at the remote peer */
6d74c3a8 1686int smc_llc_do_delete_rkey(struct smc_link_group *lgr,
60e03c62
KG		 1687 struct smc_buf_desc *rmb_desc)
1688{
6d74c3a8
KG		 1689 struct smc_llc_qentry *qentry = NULL;
1690 struct smc_link *send_link;
0b29ec64 1691 int rc = 0;
60e03c62 1692
6d74c3a8
KG		 1693 send_link = smc_llc_usable_link(lgr);
1694 if (!send_link)
1695 return -ENOLINK;
1696
6d74c3a8
KG		 1697 /* protected by llc_flow control */
1698 rc = smc_llc_send_delete_rkey(send_link, rmb_desc);
60e03c62
KG		 1699 if (rc)
1700 goto out;
1701 /* receive DELETE RKEY response from server over RoCE fabric */
6d74c3a8
KG		 1702 qentry = smc_llc_wait(lgr, send_link, SMC_LLC_WAIT_TIME,
1703 SMC_LLC_DELETE_RKEY);
1704 if (!qentry || (qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_RKEY_NEG))
60e03c62 1705 rc = -EFAULT;
60e03c62 1706out:
6d74c3a8
KG		 1707 if (qentry)
1708 smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
60e03c62
KG		 1709 return rc;
1710}
1711
92334cfc
KG		 1712/* evaluate confirm link request or response */
1713int smc_llc_eval_conf_link(struct smc_llc_qentry *qentry,
1714 enum smc_llc_reqresp type)
1715{
1716 if (type == SMC_LLC_REQ) /* SMC server assigns link_id */
1717 qentry->link->link_id = qentry->msg.confirm_link.link_num;
1718 if (!(qentry->msg.raw.hdr.flags & SMC_LLC_FLAG_NO_RMBE_EYEC))
1719 return -ENOTSUPP;
1720 return 0;
1721}
1722
9bf9abea
UB		 1723/***************************** init, exit, misc ******************************/
1724
1725static struct smc_wr_rx_handler smc_llc_rx_handlers[] = {
1726 {
1727 .handler = smc_llc_rx_handler,
1728 .type = SMC_LLC_CONFIRM_LINK
1729 },
313164da
KG		 1730 {
1731 .handler = smc_llc_rx_handler,
1732 .type = SMC_LLC_TEST_LINK
1733 },
52bedf37
KG		 1734 {
1735 .handler = smc_llc_rx_handler,
1736 .type = SMC_LLC_ADD_LINK
1737 },
87f88cda
KG		 1738 {
1739 .handler = smc_llc_rx_handler,
1740 .type = SMC_LLC_ADD_LINK_CONT
1741 },
52bedf37
KG		 1742 {
1743 .handler = smc_llc_rx_handler,
1744 .type = SMC_LLC_DELETE_LINK
1745 },
4ed75de5
KG		 1746 {
1747 .handler = smc_llc_rx_handler,
1748 .type = SMC_LLC_CONFIRM_RKEY
1749 },
1750 {
1751 .handler = smc_llc_rx_handler,
1752 .type = SMC_LLC_CONFIRM_RKEY_CONT
1753 },
1754 {
1755 .handler = smc_llc_rx_handler,
1756 .type = SMC_LLC_DELETE_RKEY
1757 },
9bf9abea
UB		 1758 {
1759 .handler = NULL,
1760 }
1761};
1762
1763int __init smc_llc_init(void)
1764{
1765 struct smc_wr_rx_handler *handler;
1766 int rc = 0;
1767
1768 for (handler = smc_llc_rx_handlers; handler->handler; handler++) {
1769 INIT_HLIST_NODE(&handler->list);
1770 rc = smc_wr_rx_register_handler(handler);
1771 if (rc)
1772 break;
1773 }
1774 return rc;
1775}
Linux 6.x block layer and io_uring tree(s)