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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * IB infrastructure:
6 * Establish SMC-R as an Infiniband Client to be notified about added and
7 * removed IB devices of type RDMA.
8 * Determine device and port characteristics for these IB devices.
9 *
10 * Copyright IBM Corp. 2016
11 *
12 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
13 */
14
15#include <linux/random.h>
16#include <linux/workqueue.h>
17#include <linux/scatterlist.h>
18#include <rdma/ib_verbs.h>
19#include <rdma/ib_cache.h>
20
21#include "smc_pnet.h"
22#include "smc_ib.h"
23#include "smc_core.h"
24#include "smc_wr.h"
25#include "smc.h"
26
27#define SMC_MAX_CQE 32766 /* max. # of completion queue elements */
28
29#define SMC_QP_MIN_RNR_TIMER 5
30#define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */
31#define SMC_QP_RETRY_CNT 7 /* 7: infinite */
32#define SMC_QP_RNR_RETRY 7 /* 7: infinite */
33
34struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */
35 .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock),
36 .list = LIST_HEAD_INIT(smc_ib_devices.list),
37};
38
39#define SMC_LOCAL_SYSTEMID_RESET "%%%%%%%"
40
41u8 local_systemid[SMC_SYSTEMID_LEN] = SMC_LOCAL_SYSTEMID_RESET; /* unique system
42 * identifier
43 */
44
45static int smc_ib_modify_qp_init(struct smc_link *lnk)
46{
47 struct ib_qp_attr qp_attr;
48
49 memset(&qp_attr, 0, sizeof(qp_attr));
50 qp_attr.qp_state = IB_QPS_INIT;
51 qp_attr.pkey_index = 0;
52 qp_attr.port_num = lnk->ibport;
53 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE
54 | IB_ACCESS_REMOTE_WRITE;
55 return ib_modify_qp(lnk->roce_qp, &qp_attr,
56 IB_QP_STATE | IB_QP_PKEY_INDEX |
57 IB_QP_ACCESS_FLAGS | IB_QP_PORT);
58}
59
60static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
61{
62 enum ib_qp_attr_mask qp_attr_mask =
63 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
64 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
65 struct ib_qp_attr qp_attr;
66
67 memset(&qp_attr, 0, sizeof(qp_attr));
68 qp_attr.qp_state = IB_QPS_RTR;
69 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
70 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
71 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
72 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0);
73 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
74 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
75 sizeof(lnk->peer_mac));
76 qp_attr.dest_qp_num = lnk->peer_qpn;
77 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
78 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
79 * requests
80 */
81 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER;
82
83 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask);
84}
85
86int smc_ib_modify_qp_rts(struct smc_link *lnk)
87{
88 struct ib_qp_attr qp_attr;
89
90 memset(&qp_attr, 0, sizeof(qp_attr));
91 qp_attr.qp_state = IB_QPS_RTS;
92 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */
93 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */
94 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */
95 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */
96 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and
97 * atomic ops allowed
98 */
99 return ib_modify_qp(lnk->roce_qp, &qp_attr,
100 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
101 IB_QP_SQ_PSN | IB_QP_RNR_RETRY |
102 IB_QP_MAX_QP_RD_ATOMIC);
103}
104
105int smc_ib_modify_qp_reset(struct smc_link *lnk)
106{
107 struct ib_qp_attr qp_attr;
108
109 memset(&qp_attr, 0, sizeof(qp_attr));
110 qp_attr.qp_state = IB_QPS_RESET;
111 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE);
112}
113
114int smc_ib_ready_link(struct smc_link *lnk)
115{
116 struct smc_link_group *lgr = smc_get_lgr(lnk);
117 int rc = 0;
118
119 rc = smc_ib_modify_qp_init(lnk);
120 if (rc)
121 goto out;
122
123 rc = smc_ib_modify_qp_rtr(lnk);
124 if (rc)
125 goto out;
126 smc_wr_remember_qp_attr(lnk);
127 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv,
128 IB_CQ_SOLICITED_MASK);
129 if (rc)
130 goto out;
131 rc = smc_wr_rx_post_init(lnk);
132 if (rc)
133 goto out;
134 smc_wr_remember_qp_attr(lnk);
135
136 if (lgr->role == SMC_SERV) {
137 rc = smc_ib_modify_qp_rts(lnk);
138 if (rc)
139 goto out;
140 smc_wr_remember_qp_attr(lnk);
141 }
142out:
143 return rc;
144}
145
146static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
147{
148 const struct ib_gid_attr *attr;
149 int rc;
150
151 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
152 if (IS_ERR(attr))
153 return -ENODEV;
154
155 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]);
156 rdma_put_gid_attr(attr);
157 return rc;
158}
159
160/* Create an identifier unique for this instance of SMC-R.
161 * The MAC-address of the first active registered IB device
162 * plus a random 2-byte number is used to create this identifier.
163 * This name is delivered to the peer during connection initialization.
164 */
165static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,
166 u8 ibport)
167{
168 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],
169 sizeof(smcibdev->mac[ibport - 1]));
170 get_random_bytes(&local_systemid[0], 2);
171}
172
173bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
174{
175 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
176}
177
178/* determine the gid for an ib-device port and vlan id */
179int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
180 unsigned short vlan_id, u8 gid[], u8 *sgid_index)
181{
182 const struct ib_gid_attr *attr;
183 const struct net_device *ndev;
184 int i;
185
186 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
187 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
188 if (IS_ERR(attr))
189 continue;
190
191 rcu_read_lock();
192 ndev = rdma_read_gid_attr_ndev_rcu(attr);
193 if (!IS_ERR(ndev) &&
194 ((!vlan_id && !is_vlan_dev(attr->ndev)) ||
195 (vlan_id && is_vlan_dev(attr->ndev) &&
196 vlan_dev_vlan_id(attr->ndev) == vlan_id)) &&
197 attr->gid_type == IB_GID_TYPE_ROCE) {
198 rcu_read_unlock();
199 if (gid)
200 memcpy(gid, &attr->gid, SMC_GID_SIZE);
201 if (sgid_index)
202 *sgid_index = attr->index;
203 rdma_put_gid_attr(attr);
204 return 0;
205 }
206 rcu_read_unlock();
207 rdma_put_gid_attr(attr);
208 }
209 return -ENODEV;
210}
211
212static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
213{
214 int rc;
215
216 memset(&smcibdev->pattr[ibport - 1], 0,
217 sizeof(smcibdev->pattr[ibport - 1]));
218 rc = ib_query_port(smcibdev->ibdev, ibport,
219 &smcibdev->pattr[ibport - 1]);
220 if (rc)
221 goto out;
222 /* the SMC protocol requires specification of the RoCE MAC address */
223 rc = smc_ib_fill_mac(smcibdev, ibport);
224 if (rc)
225 goto out;
226 if (!strncmp(local_systemid, SMC_LOCAL_SYSTEMID_RESET,
227 sizeof(local_systemid)) &&
228 smc_ib_port_active(smcibdev, ibport))
229 /* create unique system identifier */
230 smc_ib_define_local_systemid(smcibdev, ibport);
231out:
232 return rc;
233}
234
235/* process context wrapper for might_sleep smc_ib_remember_port_attr */
236static void smc_ib_port_event_work(struct work_struct *work)
237{
238 struct smc_ib_device *smcibdev = container_of(
239 work, struct smc_ib_device, port_event_work);
240 u8 port_idx;
241
242 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
243 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
244 clear_bit(port_idx, &smcibdev->port_event_mask);
245 if (!smc_ib_port_active(smcibdev, port_idx + 1))
246 smc_port_terminate(smcibdev, port_idx + 1);
247 }
248}
249
250/* can be called in IRQ context */
251static void smc_ib_global_event_handler(struct ib_event_handler *handler,
252 struct ib_event *ibevent)
253{
254 struct smc_ib_device *smcibdev;
255 u8 port_idx;
256
257 smcibdev = container_of(handler, struct smc_ib_device, event_handler);
258
259 switch (ibevent->event) {
260 case IB_EVENT_DEVICE_FATAL:
261 /* terminate all ports on device */
262 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++)
263 set_bit(port_idx, &smcibdev->port_event_mask);
264 schedule_work(&smcibdev->port_event_work);
265 break;
266 case IB_EVENT_PORT_ERR:
267 case IB_EVENT_PORT_ACTIVE:
268 case IB_EVENT_GID_CHANGE:
269 port_idx = ibevent->element.port_num - 1;
270 if (port_idx < SMC_MAX_PORTS) {
271 set_bit(port_idx, &smcibdev->port_event_mask);
272 schedule_work(&smcibdev->port_event_work);
273 }
274 break;
275 default:
276 break;
277 }
278}
279
280void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
281{
282 if (lnk->roce_pd)
283 ib_dealloc_pd(lnk->roce_pd);
284 lnk->roce_pd = NULL;
285}
286
287int smc_ib_create_protection_domain(struct smc_link *lnk)
288{
289 int rc;
290
291 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
292 rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
293 if (IS_ERR(lnk->roce_pd))
294 lnk->roce_pd = NULL;
295 return rc;
296}
297
298static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
299{
300 struct smc_link *lnk = (struct smc_link *)priv;
301 struct smc_ib_device *smcibdev = lnk->smcibdev;
302 u8 port_idx;
303
304 switch (ibevent->event) {
305 case IB_EVENT_QP_FATAL:
306 case IB_EVENT_QP_ACCESS_ERR:
307 port_idx = ibevent->element.qp->port - 1;
308 if (port_idx < SMC_MAX_PORTS) {
309 set_bit(port_idx, &smcibdev->port_event_mask);
310 schedule_work(&smcibdev->port_event_work);
311 }
312 break;
313 default:
314 break;
315 }
316}
317
318void smc_ib_destroy_queue_pair(struct smc_link *lnk)
319{
320 if (lnk->roce_qp)
321 ib_destroy_qp(lnk->roce_qp);
322 lnk->roce_qp = NULL;
323}
324
325/* create a queue pair within the protection domain for a link */
326int smc_ib_create_queue_pair(struct smc_link *lnk)
327{
328 struct ib_qp_init_attr qp_attr = {
329 .event_handler = smc_ib_qp_event_handler,
330 .qp_context = lnk,
331 .send_cq = lnk->smcibdev->roce_cq_send,
332 .recv_cq = lnk->smcibdev->roce_cq_recv,
333 .srq = NULL,
334 .cap = {
335 /* include unsolicited rdma_writes as well,
336 * there are max. 2 RDMA_WRITE per 1 WR_SEND
337 */
338 .max_send_wr = SMC_WR_BUF_CNT * 3,
339 .max_recv_wr = SMC_WR_BUF_CNT * 3,
340 .max_send_sge = SMC_IB_MAX_SEND_SGE,
341 .max_recv_sge = 1,
342 },
343 .sq_sig_type = IB_SIGNAL_REQ_WR,
344 .qp_type = IB_QPT_RC,
345 };
346 int rc;
347
348 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
349 rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
350 if (IS_ERR(lnk->roce_qp))
351 lnk->roce_qp = NULL;
352 else
353 smc_wr_remember_qp_attr(lnk);
354 return rc;
355}
356
357void smc_ib_put_memory_region(struct ib_mr *mr)
358{
359 ib_dereg_mr(mr);
360}
361
362static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot)
363{
364 unsigned int offset = 0;
365 int sg_num;
366
367 /* map the largest prefix of a dma mapped SG list */
368 sg_num = ib_map_mr_sg(buf_slot->mr_rx[SMC_SINGLE_LINK],
369 buf_slot->sgt[SMC_SINGLE_LINK].sgl,
370 buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
371 &offset, PAGE_SIZE);
372
373 return sg_num;
374}
375
376/* Allocate a memory region and map the dma mapped SG list of buf_slot */
377int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
378 struct smc_buf_desc *buf_slot)
379{
380 if (buf_slot->mr_rx[SMC_SINGLE_LINK])
381 return 0; /* already done */
382
383 buf_slot->mr_rx[SMC_SINGLE_LINK] =
384 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
385 if (IS_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK])) {
386 int rc;
387
388 rc = PTR_ERR(buf_slot->mr_rx[SMC_SINGLE_LINK]);
389 buf_slot->mr_rx[SMC_SINGLE_LINK] = NULL;
390 return rc;
391 }
392
393 if (smc_ib_map_mr_sg(buf_slot) != 1)
394 return -EINVAL;
395
396 return 0;
397}
398
399/* synchronize buffer usage for cpu access */
400void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev,
401 struct smc_buf_desc *buf_slot,
402 enum dma_data_direction data_direction)
403{
404 struct scatterlist *sg;
405 unsigned int i;
406
407 /* for now there is just one DMA address */
408 for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg,
409 buf_slot->sgt[SMC_SINGLE_LINK].nents, i) {
410 if (!sg_dma_len(sg))
411 break;
412 ib_dma_sync_single_for_cpu(smcibdev->ibdev,
413 sg_dma_address(sg),
414 sg_dma_len(sg),
415 data_direction);
416 }
417}
418
419/* synchronize buffer usage for device access */
420void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev,
421 struct smc_buf_desc *buf_slot,
422 enum dma_data_direction data_direction)
423{
424 struct scatterlist *sg;
425 unsigned int i;
426
427 /* for now there is just one DMA address */
428 for_each_sg(buf_slot->sgt[SMC_SINGLE_LINK].sgl, sg,
429 buf_slot->sgt[SMC_SINGLE_LINK].nents, i) {
430 if (!sg_dma_len(sg))
431 break;
432 ib_dma_sync_single_for_device(smcibdev->ibdev,
433 sg_dma_address(sg),
434 sg_dma_len(sg),
435 data_direction);
436 }
437}
438
439/* Map a new TX or RX buffer SG-table to DMA */
440int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
441 struct smc_buf_desc *buf_slot,
442 enum dma_data_direction data_direction)
443{
444 int mapped_nents;
445
446 mapped_nents = ib_dma_map_sg(smcibdev->ibdev,
447 buf_slot->sgt[SMC_SINGLE_LINK].sgl,
448 buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
449 data_direction);
450 if (!mapped_nents)
451 return -ENOMEM;
452
453 return mapped_nents;
454}
455
456void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev,
457 struct smc_buf_desc *buf_slot,
458 enum dma_data_direction data_direction)
459{
460 if (!buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address)
461 return; /* already unmapped */
462
463 ib_dma_unmap_sg(smcibdev->ibdev,
464 buf_slot->sgt[SMC_SINGLE_LINK].sgl,
465 buf_slot->sgt[SMC_SINGLE_LINK].orig_nents,
466 data_direction);
467 buf_slot->sgt[SMC_SINGLE_LINK].sgl->dma_address = 0;
468}
469
470long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
471{
472 struct ib_cq_init_attr cqattr = {
473 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
474 int cqe_size_order, smc_order;
475 long rc;
476
477 /* the calculated number of cq entries fits to mlx5 cq allocation */
478 cqe_size_order = cache_line_size() == 128 ? 7 : 6;
479 smc_order = MAX_ORDER - cqe_size_order - 1;
480 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
481 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
482 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
483 smc_wr_tx_cq_handler, NULL,
484 smcibdev, &cqattr);
485 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
486 if (IS_ERR(smcibdev->roce_cq_send)) {
487 smcibdev->roce_cq_send = NULL;
488 return rc;
489 }
490 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
491 smc_wr_rx_cq_handler, NULL,
492 smcibdev, &cqattr);
493 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
494 if (IS_ERR(smcibdev->roce_cq_recv)) {
495 smcibdev->roce_cq_recv = NULL;
496 goto err;
497 }
498 smc_wr_add_dev(smcibdev);
499 smcibdev->initialized = 1;
500 return rc;
501
502err:
503 ib_destroy_cq(smcibdev->roce_cq_send);
504 return rc;
505}
506
507static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
508{
509 if (!smcibdev->initialized)
510 return;
511 smcibdev->initialized = 0;
512 smc_wr_remove_dev(smcibdev);
513 ib_destroy_cq(smcibdev->roce_cq_recv);
514 ib_destroy_cq(smcibdev->roce_cq_send);
515}
516
517static struct ib_client smc_ib_client;
518
519/* callback function for ib_register_client() */
520static void smc_ib_add_dev(struct ib_device *ibdev)
521{
522 struct smc_ib_device *smcibdev;
523 u8 port_cnt;
524 int i;
525
526 if (ibdev->node_type != RDMA_NODE_IB_CA)
527 return;
528
529 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
530 if (!smcibdev)
531 return;
532
533 smcibdev->ibdev = ibdev;
534 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
535
536 spin_lock(&smc_ib_devices.lock);
537 list_add_tail(&smcibdev->list, &smc_ib_devices.list);
538 spin_unlock(&smc_ib_devices.lock);
539 ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
540 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
541 smc_ib_global_event_handler);
542 ib_register_event_handler(&smcibdev->event_handler);
543
544 /* trigger reading of the port attributes */
545 port_cnt = smcibdev->ibdev->phys_port_cnt;
546 for (i = 0;
547 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
548 i++) {
549 set_bit(i, &smcibdev->port_event_mask);
550 /* determine pnetids of the port */
551 smc_pnetid_by_dev_port(ibdev->dev.parent, i,
552 smcibdev->pnetid[i]);
553 }
554 schedule_work(&smcibdev->port_event_work);
555}
556
557/* callback function for ib_register_client() */
558static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
559{
560 struct smc_ib_device *smcibdev;
561
562 smcibdev = ib_get_client_data(ibdev, &smc_ib_client);
563 ib_set_client_data(ibdev, &smc_ib_client, NULL);
564 spin_lock(&smc_ib_devices.lock);
565 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
566 spin_unlock(&smc_ib_devices.lock);
567 smc_ib_cleanup_per_ibdev(smcibdev);
568 ib_unregister_event_handler(&smcibdev->event_handler);
569 kfree(smcibdev);
570}
571
572static struct ib_client smc_ib_client = {
573 .name = "smc_ib",
574 .add = smc_ib_add_dev,
575 .remove = smc_ib_remove_dev,
576};
577
578int __init smc_ib_register_client(void)
579{
580 return ib_register_client(&smc_ib_client);
581}
582
583void smc_ib_unregister_client(void)
584{
585 ib_unregister_client(&smc_ib_client);
586}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Shared Memory Communications over RDMA (SMC-R) and RoCE
4 *
5 * IB infrastructure:
6 * Establish SMC-R as an Infiniband Client to be notified about added and
7 * removed IB devices of type RDMA.
8 * Determine device and port characteristics for these IB devices.
9 *
10 * Copyright IBM Corp. 2016
11 *
12 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
13 */
14
15#include <linux/etherdevice.h>
16#include <linux/if_vlan.h>
17#include <linux/random.h>
18#include <linux/workqueue.h>
19#include <linux/scatterlist.h>
20#include <linux/wait.h>
21#include <linux/mutex.h>
22#include <linux/inetdevice.h>
23#include <rdma/ib_verbs.h>
24#include <rdma/ib_cache.h>
25
26#include "smc_pnet.h"
27#include "smc_ib.h"
28#include "smc_core.h"
29#include "smc_wr.h"
30#include "smc.h"
31#include "smc_netlink.h"
32
33#define SMC_MAX_CQE 32766 /* max. # of completion queue elements */
34
35#define SMC_QP_MIN_RNR_TIMER 5
36#define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */
37#define SMC_QP_RETRY_CNT 7 /* 7: infinite */
38#define SMC_QP_RNR_RETRY 7 /* 7: infinite */
39
40struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */
41 .mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex),
42 .list = LIST_HEAD_INIT(smc_ib_devices.list),
43};
44
45u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
46
47static int smc_ib_modify_qp_init(struct smc_link *lnk)
48{
49 struct ib_qp_attr qp_attr;
50
51 memset(&qp_attr, 0, sizeof(qp_attr));
52 qp_attr.qp_state = IB_QPS_INIT;
53 qp_attr.pkey_index = 0;
54 qp_attr.port_num = lnk->ibport;
55 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE
56 | IB_ACCESS_REMOTE_WRITE;
57 return ib_modify_qp(lnk->roce_qp, &qp_attr,
58 IB_QP_STATE | IB_QP_PKEY_INDEX |
59 IB_QP_ACCESS_FLAGS | IB_QP_PORT);
60}
61
62static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
63{
64 enum ib_qp_attr_mask qp_attr_mask =
65 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
66 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
67 struct ib_qp_attr qp_attr;
68 u8 hop_lim = 1;
69
70 memset(&qp_attr, 0, sizeof(qp_attr));
71 qp_attr.qp_state = IB_QPS_RTR;
72 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
73 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
74 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
75 if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
76 hop_lim = IPV6_DEFAULT_HOPLIMIT;
77 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, hop_lim, 0);
78 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
79 if (lnk->lgr->smc_version == SMC_V2 && lnk->lgr->uses_gateway)
80 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->lgr->nexthop_mac,
81 sizeof(lnk->lgr->nexthop_mac));
82 else
83 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
84 sizeof(lnk->peer_mac));
85 qp_attr.dest_qp_num = lnk->peer_qpn;
86 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
87 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
88 * requests
89 */
90 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER;
91
92 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask);
93}
94
95int smc_ib_modify_qp_rts(struct smc_link *lnk)
96{
97 struct ib_qp_attr qp_attr;
98
99 memset(&qp_attr, 0, sizeof(qp_attr));
100 qp_attr.qp_state = IB_QPS_RTS;
101 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */
102 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */
103 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */
104 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */
105 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and
106 * atomic ops allowed
107 */
108 return ib_modify_qp(lnk->roce_qp, &qp_attr,
109 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
110 IB_QP_SQ_PSN | IB_QP_RNR_RETRY |
111 IB_QP_MAX_QP_RD_ATOMIC);
112}
113
114int smc_ib_modify_qp_error(struct smc_link *lnk)
115{
116 struct ib_qp_attr qp_attr;
117
118 memset(&qp_attr, 0, sizeof(qp_attr));
119 qp_attr.qp_state = IB_QPS_ERR;
120 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE);
121}
122
123int smc_ib_ready_link(struct smc_link *lnk)
124{
125 struct smc_link_group *lgr = smc_get_lgr(lnk);
126 int rc = 0;
127
128 rc = smc_ib_modify_qp_init(lnk);
129 if (rc)
130 goto out;
131
132 rc = smc_ib_modify_qp_rtr(lnk);
133 if (rc)
134 goto out;
135 smc_wr_remember_qp_attr(lnk);
136 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv,
137 IB_CQ_SOLICITED_MASK);
138 if (rc)
139 goto out;
140 rc = smc_wr_rx_post_init(lnk);
141 if (rc)
142 goto out;
143 smc_wr_remember_qp_attr(lnk);
144
145 if (lgr->role == SMC_SERV) {
146 rc = smc_ib_modify_qp_rts(lnk);
147 if (rc)
148 goto out;
149 smc_wr_remember_qp_attr(lnk);
150 }
151out:
152 return rc;
153}
154
155static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
156{
157 const struct ib_gid_attr *attr;
158 int rc;
159
160 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
161 if (IS_ERR(attr))
162 return -ENODEV;
163
164 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]);
165 rdma_put_gid_attr(attr);
166 return rc;
167}
168
169/* Create an identifier unique for this instance of SMC-R.
170 * The MAC-address of the first active registered IB device
171 * plus a random 2-byte number is used to create this identifier.
172 * This name is delivered to the peer during connection initialization.
173 */
174static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,
175 u8 ibport)
176{
177 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],
178 sizeof(smcibdev->mac[ibport - 1]));
179}
180
181bool smc_ib_is_valid_local_systemid(void)
182{
183 return !is_zero_ether_addr(&local_systemid[2]);
184}
185
186static void smc_ib_init_local_systemid(void)
187{
188 get_random_bytes(&local_systemid[0], 2);
189}
190
191bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
192{
193 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
194}
195
196int smc_ib_find_route(__be32 saddr, __be32 daddr,
197 u8 nexthop_mac[], u8 *uses_gateway)
198{
199 struct neighbour *neigh = NULL;
200 struct rtable *rt = NULL;
201 struct flowi4 fl4 = {
202 .saddr = saddr,
203 .daddr = daddr
204 };
205
206 if (daddr == cpu_to_be32(INADDR_NONE))
207 goto out;
208 rt = ip_route_output_flow(&init_net, &fl4, NULL);
209 if (IS_ERR(rt))
210 goto out;
211 if (rt->rt_uses_gateway && rt->rt_gw_family != AF_INET)
212 goto out;
213 neigh = rt->dst.ops->neigh_lookup(&rt->dst, NULL, &fl4.daddr);
214 if (neigh) {
215 memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
216 *uses_gateway = rt->rt_uses_gateway;
217 return 0;
218 }
219out:
220 return -ENOENT;
221}
222
223static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
224 const struct ib_gid_attr *attr,
225 u8 gid[], u8 *sgid_index,
226 struct smc_init_info_smcrv2 *smcrv2)
227{
228 if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
229 if (gid)
230 memcpy(gid, &attr->gid, SMC_GID_SIZE);
231 if (sgid_index)
232 *sgid_index = attr->index;
233 return 0;
234 }
235 if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
236 smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
237 struct in_device *in_dev = __in_dev_get_rcu(ndev);
238 const struct in_ifaddr *ifa;
239 bool subnet_match = false;
240
241 if (!in_dev)
242 goto out;
243 in_dev_for_each_ifa_rcu(ifa, in_dev) {
244 if (!inet_ifa_match(smcrv2->saddr, ifa))
245 continue;
246 subnet_match = true;
247 break;
248 }
249 if (!subnet_match)
250 goto out;
251 if (smcrv2->daddr && smc_ib_find_route(smcrv2->saddr,
252 smcrv2->daddr,
253 smcrv2->nexthop_mac,
254 &smcrv2->uses_gateway))
255 goto out;
256
257 if (gid)
258 memcpy(gid, &attr->gid, SMC_GID_SIZE);
259 if (sgid_index)
260 *sgid_index = attr->index;
261 return 0;
262 }
263out:
264 return -ENODEV;
265}
266
267/* determine the gid for an ib-device port and vlan id */
268int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
269 unsigned short vlan_id, u8 gid[], u8 *sgid_index,
270 struct smc_init_info_smcrv2 *smcrv2)
271{
272 const struct ib_gid_attr *attr;
273 const struct net_device *ndev;
274 int i;
275
276 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
277 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
278 if (IS_ERR(attr))
279 continue;
280
281 rcu_read_lock();
282 ndev = rdma_read_gid_attr_ndev_rcu(attr);
283 if (!IS_ERR(ndev) &&
284 ((!vlan_id && !is_vlan_dev(ndev)) ||
285 (vlan_id && is_vlan_dev(ndev) &&
286 vlan_dev_vlan_id(ndev) == vlan_id))) {
287 if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
288 sgid_index, smcrv2)) {
289 rcu_read_unlock();
290 rdma_put_gid_attr(attr);
291 return 0;
292 }
293 }
294 rcu_read_unlock();
295 rdma_put_gid_attr(attr);
296 }
297 return -ENODEV;
298}
299
300/* check if gid is still defined on smcibdev */
301static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
302 struct smc_ib_device *smcibdev, u8 ibport)
303{
304 const struct ib_gid_attr *attr;
305 bool rc = false;
306 int i;
307
308 for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
309 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
310 if (IS_ERR(attr))
311 continue;
312
313 rcu_read_lock();
314 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
315 (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
316 !(ipv6_addr_type((const struct in6_addr *)&attr->gid)
317 & IPV6_ADDR_LINKLOCAL)))
318 if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
319 rc = true;
320 rcu_read_unlock();
321 rdma_put_gid_attr(attr);
322 }
323 return rc;
324}
325
326/* check all links if the gid is still defined on smcibdev */
327static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
328{
329 struct smc_link_group *lgr;
330 int i;
331
332 spin_lock_bh(&smc_lgr_list.lock);
333 list_for_each_entry(lgr, &smc_lgr_list.list, list) {
334 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
335 SMC_MAX_PNETID_LEN))
336 continue; /* lgr is not affected */
337 if (list_empty(&lgr->list))
338 continue;
339 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
340 if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
341 lgr->lnk[i].smcibdev != smcibdev)
342 continue;
343 if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
344 lgr->smc_version == SMC_V2,
345 smcibdev, ibport))
346 smcr_port_err(smcibdev, ibport);
347 }
348 }
349 spin_unlock_bh(&smc_lgr_list.lock);
350}
351
352static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
353{
354 int rc;
355
356 memset(&smcibdev->pattr[ibport - 1], 0,
357 sizeof(smcibdev->pattr[ibport - 1]));
358 rc = ib_query_port(smcibdev->ibdev, ibport,
359 &smcibdev->pattr[ibport - 1]);
360 if (rc)
361 goto out;
362 /* the SMC protocol requires specification of the RoCE MAC address */
363 rc = smc_ib_fill_mac(smcibdev, ibport);
364 if (rc)
365 goto out;
366 if (!smc_ib_is_valid_local_systemid() &&
367 smc_ib_port_active(smcibdev, ibport))
368 /* create unique system identifier */
369 smc_ib_define_local_systemid(smcibdev, ibport);
370out:
371 return rc;
372}
373
374/* process context wrapper for might_sleep smc_ib_remember_port_attr */
375static void smc_ib_port_event_work(struct work_struct *work)
376{
377 struct smc_ib_device *smcibdev = container_of(
378 work, struct smc_ib_device, port_event_work);
379 u8 port_idx;
380
381 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
382 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
383 clear_bit(port_idx, &smcibdev->port_event_mask);
384 if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
385 set_bit(port_idx, smcibdev->ports_going_away);
386 smcr_port_err(smcibdev, port_idx + 1);
387 } else {
388 clear_bit(port_idx, smcibdev->ports_going_away);
389 smcr_port_add(smcibdev, port_idx + 1);
390 smc_ib_gid_check(smcibdev, port_idx + 1);
391 }
392 }
393}
394
395/* can be called in IRQ context */
396static void smc_ib_global_event_handler(struct ib_event_handler *handler,
397 struct ib_event *ibevent)
398{
399 struct smc_ib_device *smcibdev;
400 bool schedule = false;
401 u8 port_idx;
402
403 smcibdev = container_of(handler, struct smc_ib_device, event_handler);
404
405 switch (ibevent->event) {
406 case IB_EVENT_DEVICE_FATAL:
407 /* terminate all ports on device */
408 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
409 set_bit(port_idx, &smcibdev->port_event_mask);
410 if (!test_and_set_bit(port_idx,
411 smcibdev->ports_going_away))
412 schedule = true;
413 }
414 if (schedule)
415 schedule_work(&smcibdev->port_event_work);
416 break;
417 case IB_EVENT_PORT_ACTIVE:
418 port_idx = ibevent->element.port_num - 1;
419 if (port_idx >= SMC_MAX_PORTS)
420 break;
421 set_bit(port_idx, &smcibdev->port_event_mask);
422 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
423 schedule_work(&smcibdev->port_event_work);
424 break;
425 case IB_EVENT_PORT_ERR:
426 port_idx = ibevent->element.port_num - 1;
427 if (port_idx >= SMC_MAX_PORTS)
428 break;
429 set_bit(port_idx, &smcibdev->port_event_mask);
430 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
431 schedule_work(&smcibdev->port_event_work);
432 break;
433 case IB_EVENT_GID_CHANGE:
434 port_idx = ibevent->element.port_num - 1;
435 if (port_idx >= SMC_MAX_PORTS)
436 break;
437 set_bit(port_idx, &smcibdev->port_event_mask);
438 schedule_work(&smcibdev->port_event_work);
439 break;
440 default:
441 break;
442 }
443}
444
445void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
446{
447 if (lnk->roce_pd)
448 ib_dealloc_pd(lnk->roce_pd);
449 lnk->roce_pd = NULL;
450}
451
452int smc_ib_create_protection_domain(struct smc_link *lnk)
453{
454 int rc;
455
456 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
457 rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
458 if (IS_ERR(lnk->roce_pd))
459 lnk->roce_pd = NULL;
460 return rc;
461}
462
463static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
464 struct smc_ib_device *smcibdev)
465{
466 struct smc_link_group *lgr;
467 bool rc = false;
468 int i;
469
470 spin_lock_bh(&smc_lgr->lock);
471 list_for_each_entry(lgr, &smc_lgr->list, list) {
472 if (lgr->is_smcd)
473 continue;
474 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
475 if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
476 lgr->lnk[i].smcibdev != smcibdev)
477 continue;
478 if (lgr->type == SMC_LGR_SINGLE ||
479 lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
480 rc = true;
481 goto out;
482 }
483 }
484 }
485out:
486 spin_unlock_bh(&smc_lgr->lock);
487 return rc;
488}
489
490static int smc_nl_handle_dev_port(struct sk_buff *skb,
491 struct ib_device *ibdev,
492 struct smc_ib_device *smcibdev,
493 int port)
494{
495 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
496 struct nlattr *port_attrs;
497 unsigned char port_state;
498 int lnk_count = 0;
499
500 port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
501 if (!port_attrs)
502 goto errout;
503
504 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
505 smcibdev->pnetid_by_user[port]))
506 goto errattr;
507 memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
508 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
509 if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
510 goto errattr;
511 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
512 smcibdev->ndev_ifidx[port]))
513 goto errattr;
514 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
515 goto errattr;
516 port_state = smc_ib_port_active(smcibdev, port + 1);
517 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
518 goto errattr;
519 lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
520 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
521 goto errattr;
522 nla_nest_end(skb, port_attrs);
523 return 0;
524errattr:
525 nla_nest_cancel(skb, port_attrs);
526errout:
527 return -EMSGSIZE;
528}
529
530static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
531 struct sk_buff *skb)
532{
533 if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
534 return false;
535 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
536 return false;
537 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
538 return false;
539 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
540 return false;
541 if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
542 return false;
543 return true;
544}
545
546static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
547 struct sk_buff *skb,
548 struct netlink_callback *cb)
549{
550 char smc_ibname[IB_DEVICE_NAME_MAX];
551 struct smc_pci_dev smc_pci_dev;
552 struct pci_dev *pci_dev;
553 unsigned char is_crit;
554 struct nlattr *attrs;
555 void *nlh;
556 int i;
557
558 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
559 &smc_gen_nl_family, NLM_F_MULTI,
560 SMC_NETLINK_GET_DEV_SMCR);
561 if (!nlh)
562 goto errmsg;
563 attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
564 if (!attrs)
565 goto errout;
566 is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
567 if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
568 goto errattr;
569 if (smcibdev->ibdev->dev.parent) {
570 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
571 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
572 smc_set_pci_values(pci_dev, &smc_pci_dev);
573 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
574 goto errattr;
575 }
576 snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
577 if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
578 goto errattr;
579 for (i = 1; i <= SMC_MAX_PORTS; i++) {
580 if (!rdma_is_port_valid(smcibdev->ibdev, i))
581 continue;
582 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
583 smcibdev, i - 1))
584 goto errattr;
585 }
586
587 nla_nest_end(skb, attrs);
588 genlmsg_end(skb, nlh);
589 return 0;
590
591errattr:
592 nla_nest_cancel(skb, attrs);
593errout:
594 genlmsg_cancel(skb, nlh);
595errmsg:
596 return -EMSGSIZE;
597}
598
599static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
600 struct sk_buff *skb,
601 struct netlink_callback *cb)
602{
603 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
604 struct smc_ib_device *smcibdev;
605 int snum = cb_ctx->pos[0];
606 int num = 0;
607
608 mutex_lock(&dev_list->mutex);
609 list_for_each_entry(smcibdev, &dev_list->list, list) {
610 if (num < snum)
611 goto next;
612 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
613 goto errout;
614next:
615 num++;
616 }
617errout:
618 mutex_unlock(&dev_list->mutex);
619 cb_ctx->pos[0] = num;
620}
621
622int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
623{
624 smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
625 return skb->len;
626}
627
628static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
629{
630 struct smc_link *lnk = (struct smc_link *)priv;
631 struct smc_ib_device *smcibdev = lnk->smcibdev;
632 u8 port_idx;
633
634 switch (ibevent->event) {
635 case IB_EVENT_QP_FATAL:
636 case IB_EVENT_QP_ACCESS_ERR:
637 port_idx = ibevent->element.qp->port - 1;
638 if (port_idx >= SMC_MAX_PORTS)
639 break;
640 set_bit(port_idx, &smcibdev->port_event_mask);
641 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
642 schedule_work(&smcibdev->port_event_work);
643 break;
644 default:
645 break;
646 }
647}
648
649void smc_ib_destroy_queue_pair(struct smc_link *lnk)
650{
651 if (lnk->roce_qp)
652 ib_destroy_qp(lnk->roce_qp);
653 lnk->roce_qp = NULL;
654}
655
656/* create a queue pair within the protection domain for a link */
657int smc_ib_create_queue_pair(struct smc_link *lnk)
658{
659 int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1;
660 struct ib_qp_init_attr qp_attr = {
661 .event_handler = smc_ib_qp_event_handler,
662 .qp_context = lnk,
663 .send_cq = lnk->smcibdev->roce_cq_send,
664 .recv_cq = lnk->smcibdev->roce_cq_recv,
665 .srq = NULL,
666 .cap = {
667 /* include unsolicited rdma_writes as well,
668 * there are max. 2 RDMA_WRITE per 1 WR_SEND
669 */
670 .max_send_wr = SMC_WR_BUF_CNT * 3,
671 .max_recv_wr = SMC_WR_BUF_CNT * 3,
672 .max_send_sge = SMC_IB_MAX_SEND_SGE,
673 .max_recv_sge = sges_per_buf,
674 .max_inline_data = 0,
675 },
676 .sq_sig_type = IB_SIGNAL_REQ_WR,
677 .qp_type = IB_QPT_RC,
678 };
679 int rc;
680
681 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
682 rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
683 if (IS_ERR(lnk->roce_qp))
684 lnk->roce_qp = NULL;
685 else
686 smc_wr_remember_qp_attr(lnk);
687 return rc;
688}
689
690void smc_ib_put_memory_region(struct ib_mr *mr)
691{
692 ib_dereg_mr(mr);
693}
694
695static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
696{
697 unsigned int offset = 0;
698 int sg_num;
699
700 /* map the largest prefix of a dma mapped SG list */
701 sg_num = ib_map_mr_sg(buf_slot->mr[link_idx],
702 buf_slot->sgt[link_idx].sgl,
703 buf_slot->sgt[link_idx].orig_nents,
704 &offset, PAGE_SIZE);
705
706 return sg_num;
707}
708
709/* Allocate a memory region and map the dma mapped SG list of buf_slot */
710int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
711 struct smc_buf_desc *buf_slot, u8 link_idx)
712{
713 if (buf_slot->mr[link_idx])
714 return 0; /* already done */
715
716 buf_slot->mr[link_idx] =
717 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
718 if (IS_ERR(buf_slot->mr[link_idx])) {
719 int rc;
720
721 rc = PTR_ERR(buf_slot->mr[link_idx]);
722 buf_slot->mr[link_idx] = NULL;
723 return rc;
724 }
725
726 if (smc_ib_map_mr_sg(buf_slot, link_idx) !=
727 buf_slot->sgt[link_idx].orig_nents)
728 return -EINVAL;
729
730 return 0;
731}
732
733bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
734 struct smc_buf_desc *buf_slot)
735{
736 struct scatterlist *sg;
737 unsigned int i;
738 bool ret = false;
739
740 /* for now there is just one DMA address */
741 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
742 buf_slot->sgt[lnk->link_idx].nents, i) {
743 if (!sg_dma_len(sg))
744 break;
745 if (dma_need_sync(lnk->smcibdev->ibdev->dma_device,
746 sg_dma_address(sg))) {
747 ret = true;
748 goto out;
749 }
750 }
751
752out:
753 return ret;
754}
755
756/* synchronize buffer usage for cpu access */
757void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
758 struct smc_buf_desc *buf_slot,
759 enum dma_data_direction data_direction)
760{
761 struct scatterlist *sg;
762 unsigned int i;
763
764 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
765 return;
766
767 /* for now there is just one DMA address */
768 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
769 buf_slot->sgt[lnk->link_idx].nents, i) {
770 if (!sg_dma_len(sg))
771 break;
772 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
773 sg_dma_address(sg),
774 sg_dma_len(sg),
775 data_direction);
776 }
777}
778
779/* synchronize buffer usage for device access */
780void smc_ib_sync_sg_for_device(struct smc_link *lnk,
781 struct smc_buf_desc *buf_slot,
782 enum dma_data_direction data_direction)
783{
784 struct scatterlist *sg;
785 unsigned int i;
786
787 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
788 return;
789
790 /* for now there is just one DMA address */
791 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
792 buf_slot->sgt[lnk->link_idx].nents, i) {
793 if (!sg_dma_len(sg))
794 break;
795 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
796 sg_dma_address(sg),
797 sg_dma_len(sg),
798 data_direction);
799 }
800}
801
802/* Map a new TX or RX buffer SG-table to DMA */
803int smc_ib_buf_map_sg(struct smc_link *lnk,
804 struct smc_buf_desc *buf_slot,
805 enum dma_data_direction data_direction)
806{
807 int mapped_nents;
808
809 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
810 buf_slot->sgt[lnk->link_idx].sgl,
811 buf_slot->sgt[lnk->link_idx].orig_nents,
812 data_direction);
813 if (!mapped_nents)
814 return -ENOMEM;
815
816 return mapped_nents;
817}
818
819void smc_ib_buf_unmap_sg(struct smc_link *lnk,
820 struct smc_buf_desc *buf_slot,
821 enum dma_data_direction data_direction)
822{
823 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
824 return; /* already unmapped */
825
826 ib_dma_unmap_sg(lnk->smcibdev->ibdev,
827 buf_slot->sgt[lnk->link_idx].sgl,
828 buf_slot->sgt[lnk->link_idx].orig_nents,
829 data_direction);
830 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
831}
832
833long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
834{
835 struct ib_cq_init_attr cqattr = {
836 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
837 int cqe_size_order, smc_order;
838 long rc;
839
840 mutex_lock(&smcibdev->mutex);
841 rc = 0;
842 if (smcibdev->initialized)
843 goto out;
844 /* the calculated number of cq entries fits to mlx5 cq allocation */
845 cqe_size_order = cache_line_size() == 128 ? 7 : 6;
846 smc_order = MAX_ORDER - cqe_size_order - 1;
847 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
848 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
849 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
850 smc_wr_tx_cq_handler, NULL,
851 smcibdev, &cqattr);
852 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
853 if (IS_ERR(smcibdev->roce_cq_send)) {
854 smcibdev->roce_cq_send = NULL;
855 goto out;
856 }
857 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
858 smc_wr_rx_cq_handler, NULL,
859 smcibdev, &cqattr);
860 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
861 if (IS_ERR(smcibdev->roce_cq_recv)) {
862 smcibdev->roce_cq_recv = NULL;
863 goto err;
864 }
865 smc_wr_add_dev(smcibdev);
866 smcibdev->initialized = 1;
867 goto out;
868
869err:
870 ib_destroy_cq(smcibdev->roce_cq_send);
871out:
872 mutex_unlock(&smcibdev->mutex);
873 return rc;
874}
875
876static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
877{
878 mutex_lock(&smcibdev->mutex);
879 if (!smcibdev->initialized)
880 goto out;
881 smcibdev->initialized = 0;
882 ib_destroy_cq(smcibdev->roce_cq_recv);
883 ib_destroy_cq(smcibdev->roce_cq_send);
884 smc_wr_remove_dev(smcibdev);
885out:
886 mutex_unlock(&smcibdev->mutex);
887}
888
889static struct ib_client smc_ib_client;
890
891static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
892{
893 struct ib_device *ibdev = smcibdev->ibdev;
894 struct net_device *ndev;
895
896 if (!ibdev->ops.get_netdev)
897 return;
898 ndev = ibdev->ops.get_netdev(ibdev, port + 1);
899 if (ndev) {
900 smcibdev->ndev_ifidx[port] = ndev->ifindex;
901 dev_put(ndev);
902 }
903}
904
905void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
906{
907 struct smc_ib_device *smcibdev;
908 struct ib_device *libdev;
909 struct net_device *lndev;
910 u8 port_cnt;
911 int i;
912
913 mutex_lock(&smc_ib_devices.mutex);
914 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
915 port_cnt = smcibdev->ibdev->phys_port_cnt;
916 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
917 libdev = smcibdev->ibdev;
918 if (!libdev->ops.get_netdev)
919 continue;
920 lndev = libdev->ops.get_netdev(libdev, i + 1);
921 dev_put(lndev);
922 if (lndev != ndev)
923 continue;
924 if (event == NETDEV_REGISTER)
925 smcibdev->ndev_ifidx[i] = ndev->ifindex;
926 if (event == NETDEV_UNREGISTER)
927 smcibdev->ndev_ifidx[i] = 0;
928 }
929 }
930 mutex_unlock(&smc_ib_devices.mutex);
931}
932
933/* callback function for ib_register_client() */
934static int smc_ib_add_dev(struct ib_device *ibdev)
935{
936 struct smc_ib_device *smcibdev;
937 u8 port_cnt;
938 int i;
939
940 if (ibdev->node_type != RDMA_NODE_IB_CA)
941 return -EOPNOTSUPP;
942
943 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
944 if (!smcibdev)
945 return -ENOMEM;
946
947 smcibdev->ibdev = ibdev;
948 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
949 atomic_set(&smcibdev->lnk_cnt, 0);
950 init_waitqueue_head(&smcibdev->lnks_deleted);
951 mutex_init(&smcibdev->mutex);
952 mutex_lock(&smc_ib_devices.mutex);
953 list_add_tail(&smcibdev->list, &smc_ib_devices.list);
954 mutex_unlock(&smc_ib_devices.mutex);
955 ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
956 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
957 smc_ib_global_event_handler);
958 ib_register_event_handler(&smcibdev->event_handler);
959
960 /* trigger reading of the port attributes */
961 port_cnt = smcibdev->ibdev->phys_port_cnt;
962 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
963 smcibdev->ibdev->name, port_cnt);
964 for (i = 0;
965 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
966 i++) {
967 set_bit(i, &smcibdev->port_event_mask);
968 /* determine pnetids of the port */
969 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
970 smcibdev->pnetid[i]))
971 smc_pnetid_by_table_ib(smcibdev, i + 1);
972 smc_copy_netdev_ifindex(smcibdev, i);
973 pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
974 "%.16s%s\n",
975 smcibdev->ibdev->name, i + 1,
976 smcibdev->pnetid[i],
977 smcibdev->pnetid_by_user[i] ?
978 " (user defined)" :
979 "");
980 }
981 schedule_work(&smcibdev->port_event_work);
982 return 0;
983}
984
985/* callback function for ib_unregister_client() */
986static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
987{
988 struct smc_ib_device *smcibdev = client_data;
989
990 mutex_lock(&smc_ib_devices.mutex);
991 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
992 mutex_unlock(&smc_ib_devices.mutex);
993 pr_warn_ratelimited("smc: removing ib device %s\n",
994 smcibdev->ibdev->name);
995 smc_smcr_terminate_all(smcibdev);
996 smc_ib_cleanup_per_ibdev(smcibdev);
997 ib_unregister_event_handler(&smcibdev->event_handler);
998 cancel_work_sync(&smcibdev->port_event_work);
999 kfree(smcibdev);
1000}
1001
1002static struct ib_client smc_ib_client = {
1003 .name = "smc_ib",
1004 .add = smc_ib_add_dev,
1005 .remove = smc_ib_remove_dev,
1006};
1007
1008int __init smc_ib_register_client(void)
1009{
1010 smc_ib_init_local_systemid();
1011 return ib_register_client(&smc_ib_client);
1012}
1013
1014void smc_ib_unregister_client(void)
1015{
1016 ib_unregister_client(&smc_ib_client);
1017}