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
40 struct 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
45 u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
46
47 static 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
62 static 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
95 int 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
114 int 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
123 int 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 }
151 out:
152 return rc;
153 }
154
155 static 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 */
174 static 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
181 bool smc_ib_is_valid_local_systemid(void)
182 {
183 return !is_zero_ether_addr(&local_systemid[2]);
184 }
185
186 static void smc_ib_init_local_systemid(void)
187 {
188 get_random_bytes(&local_systemid[0], 2);
189 }
190
191 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
192 {
193 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
194 }
195
196 int smc_ib_find_route(struct net *net, __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(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_rt;
213 neigh = dst_neigh_lookup(&rt->dst, &fl4.daddr);
214 if (!neigh)
215 goto out_rt;
216 memcpy(nexthop_mac, neigh->ha, ETH_ALEN);
217 *uses_gateway = rt->rt_uses_gateway;
218 neigh_release(neigh);
219 ip_rt_put(rt);
220 return 0;
221
222 out_rt:
223 ip_rt_put(rt);
224 out:
225 return -ENOENT;
226 }
227
228 static int smc_ib_determine_gid_rcu(const struct net_device *ndev,
229 const struct ib_gid_attr *attr,
230 u8 gid[], u8 *sgid_index,
231 struct smc_init_info_smcrv2 *smcrv2)
232 {
233 if (!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) {
234 if (gid)
235 memcpy(gid, &attr->gid, SMC_GID_SIZE);
236 if (sgid_index)
237 *sgid_index = attr->index;
238 return 0;
239 }
240 if (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
241 smc_ib_gid_to_ipv4((u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
242 struct in_device *in_dev = __in_dev_get_rcu(ndev);
243 struct net *net = dev_net(ndev);
244 const struct in_ifaddr *ifa;
245 bool subnet_match = false;
246
247 if (!in_dev)
248 goto out;
249 in_dev_for_each_ifa_rcu(ifa, in_dev) {
250 if (!inet_ifa_match(smcrv2->saddr, ifa))
251 continue;
252 subnet_match = true;
253 break;
254 }
255 if (!subnet_match)
256 goto out;
257 if (smcrv2->daddr && smc_ib_find_route(net, smcrv2->saddr,
258 smcrv2->daddr,
259 smcrv2->nexthop_mac,
260 &smcrv2->uses_gateway))
261 goto out;
262
263 if (gid)
264 memcpy(gid, &attr->gid, SMC_GID_SIZE);
265 if (sgid_index)
266 *sgid_index = attr->index;
267 return 0;
268 }
269 out:
270 return -ENODEV;
271 }
272
273 /* determine the gid for an ib-device port and vlan id */
274 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
275 unsigned short vlan_id, u8 gid[], u8 *sgid_index,
276 struct smc_init_info_smcrv2 *smcrv2)
277 {
278 const struct ib_gid_attr *attr;
279 const struct net_device *ndev;
280 int i;
281
282 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
283 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
284 if (IS_ERR(attr))
285 continue;
286
287 rcu_read_lock();
288 ndev = rdma_read_gid_attr_ndev_rcu(attr);
289 if (!IS_ERR(ndev) &&
290 ((!vlan_id && !is_vlan_dev(ndev)) ||
291 (vlan_id && is_vlan_dev(ndev) &&
292 vlan_dev_vlan_id(ndev) == vlan_id))) {
293 if (!smc_ib_determine_gid_rcu(ndev, attr, gid,
294 sgid_index, smcrv2)) {
295 rcu_read_unlock();
296 rdma_put_gid_attr(attr);
297 return 0;
298 }
299 }
300 rcu_read_unlock();
301 rdma_put_gid_attr(attr);
302 }
303 return -ENODEV;
304 }
305
306 /* check if gid is still defined on smcibdev */
307 static bool smc_ib_check_link_gid(u8 gid[SMC_GID_SIZE], bool smcrv2,
308 struct smc_ib_device *smcibdev, u8 ibport)
309 {
310 const struct ib_gid_attr *attr;
311 bool rc = false;
312 int i;
313
314 for (i = 0; !rc && i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
315 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
316 if (IS_ERR(attr))
317 continue;
318
319 rcu_read_lock();
320 if ((!smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE) ||
321 (smcrv2 && attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
322 !(ipv6_addr_type((const struct in6_addr *)&attr->gid)
323 & IPV6_ADDR_LINKLOCAL)))
324 if (!memcmp(gid, &attr->gid, SMC_GID_SIZE))
325 rc = true;
326 rcu_read_unlock();
327 rdma_put_gid_attr(attr);
328 }
329 return rc;
330 }
331
332 /* check all links if the gid is still defined on smcibdev */
333 static void smc_ib_gid_check(struct smc_ib_device *smcibdev, u8 ibport)
334 {
335 struct smc_link_group *lgr;
336 int i;
337
338 spin_lock_bh(&smc_lgr_list.lock);
339 list_for_each_entry(lgr, &smc_lgr_list.list, list) {
340 if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
341 SMC_MAX_PNETID_LEN))
342 continue; /* lgr is not affected */
343 if (list_empty(&lgr->list))
344 continue;
345 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
346 if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
347 lgr->lnk[i].smcibdev != smcibdev)
348 continue;
349 if (!smc_ib_check_link_gid(lgr->lnk[i].gid,
350 lgr->smc_version == SMC_V2,
351 smcibdev, ibport))
352 smcr_port_err(smcibdev, ibport);
353 }
354 }
355 spin_unlock_bh(&smc_lgr_list.lock);
356 }
357
358 static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
359 {
360 int rc;
361
362 memset(&smcibdev->pattr[ibport - 1], 0,
363 sizeof(smcibdev->pattr[ibport - 1]));
364 rc = ib_query_port(smcibdev->ibdev, ibport,
365 &smcibdev->pattr[ibport - 1]);
366 if (rc)
367 goto out;
368 /* the SMC protocol requires specification of the RoCE MAC address */
369 rc = smc_ib_fill_mac(smcibdev, ibport);
370 if (rc)
371 goto out;
372 if (!smc_ib_is_valid_local_systemid() &&
373 smc_ib_port_active(smcibdev, ibport))
374 /* create unique system identifier */
375 smc_ib_define_local_systemid(smcibdev, ibport);
376 out:
377 return rc;
378 }
379
380 /* process context wrapper for might_sleep smc_ib_remember_port_attr */
381 static void smc_ib_port_event_work(struct work_struct *work)
382 {
383 struct smc_ib_device *smcibdev = container_of(
384 work, struct smc_ib_device, port_event_work);
385 u8 port_idx;
386
387 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
388 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
389 clear_bit(port_idx, &smcibdev->port_event_mask);
390 if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
391 set_bit(port_idx, smcibdev->ports_going_away);
392 smcr_port_err(smcibdev, port_idx + 1);
393 } else {
394 clear_bit(port_idx, smcibdev->ports_going_away);
395 smcr_port_add(smcibdev, port_idx + 1);
396 smc_ib_gid_check(smcibdev, port_idx + 1);
397 }
398 }
399 }
400
401 /* can be called in IRQ context */
402 static void smc_ib_global_event_handler(struct ib_event_handler *handler,
403 struct ib_event *ibevent)
404 {
405 struct smc_ib_device *smcibdev;
406 bool schedule = false;
407 u8 port_idx;
408
409 smcibdev = container_of(handler, struct smc_ib_device, event_handler);
410
411 switch (ibevent->event) {
412 case IB_EVENT_DEVICE_FATAL:
413 /* terminate all ports on device */
414 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
415 set_bit(port_idx, &smcibdev->port_event_mask);
416 if (!test_and_set_bit(port_idx,
417 smcibdev->ports_going_away))
418 schedule = true;
419 }
420 if (schedule)
421 schedule_work(&smcibdev->port_event_work);
422 break;
423 case IB_EVENT_PORT_ACTIVE:
424 port_idx = ibevent->element.port_num - 1;
425 if (port_idx >= SMC_MAX_PORTS)
426 break;
427 set_bit(port_idx, &smcibdev->port_event_mask);
428 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
429 schedule_work(&smcibdev->port_event_work);
430 break;
431 case IB_EVENT_PORT_ERR:
432 port_idx = ibevent->element.port_num - 1;
433 if (port_idx >= SMC_MAX_PORTS)
434 break;
435 set_bit(port_idx, &smcibdev->port_event_mask);
436 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
437 schedule_work(&smcibdev->port_event_work);
438 break;
439 case IB_EVENT_GID_CHANGE:
440 port_idx = ibevent->element.port_num - 1;
441 if (port_idx >= SMC_MAX_PORTS)
442 break;
443 set_bit(port_idx, &smcibdev->port_event_mask);
444 schedule_work(&smcibdev->port_event_work);
445 break;
446 default:
447 break;
448 }
449 }
450
451 void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
452 {
453 if (lnk->roce_pd)
454 ib_dealloc_pd(lnk->roce_pd);
455 lnk->roce_pd = NULL;
456 }
457
458 int smc_ib_create_protection_domain(struct smc_link *lnk)
459 {
460 int rc;
461
462 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
463 rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
464 if (IS_ERR(lnk->roce_pd))
465 lnk->roce_pd = NULL;
466 return rc;
467 }
468
469 static bool smcr_diag_is_dev_critical(struct smc_lgr_list *smc_lgr,
470 struct smc_ib_device *smcibdev)
471 {
472 struct smc_link_group *lgr;
473 bool rc = false;
474 int i;
475
476 spin_lock_bh(&smc_lgr->lock);
477 list_for_each_entry(lgr, &smc_lgr->list, list) {
478 if (lgr->is_smcd)
479 continue;
480 for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
481 if (lgr->lnk[i].state == SMC_LNK_UNUSED ||
482 lgr->lnk[i].smcibdev != smcibdev)
483 continue;
484 if (lgr->type == SMC_LGR_SINGLE ||
485 lgr->type == SMC_LGR_ASYMMETRIC_LOCAL) {
486 rc = true;
487 goto out;
488 }
489 }
490 }
491 out:
492 spin_unlock_bh(&smc_lgr->lock);
493 return rc;
494 }
495
496 static int smc_nl_handle_dev_port(struct sk_buff *skb,
497 struct ib_device *ibdev,
498 struct smc_ib_device *smcibdev,
499 int port)
500 {
501 char smc_pnet[SMC_MAX_PNETID_LEN + 1];
502 struct nlattr *port_attrs;
503 unsigned char port_state;
504 int lnk_count = 0;
505
506 port_attrs = nla_nest_start(skb, SMC_NLA_DEV_PORT + port);
507 if (!port_attrs)
508 goto errout;
509
510 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_PNET_USR,
511 smcibdev->pnetid_by_user[port]))
512 goto errattr;
513 memcpy(smc_pnet, &smcibdev->pnetid[port], SMC_MAX_PNETID_LEN);
514 smc_pnet[SMC_MAX_PNETID_LEN] = 0;
515 if (nla_put_string(skb, SMC_NLA_DEV_PORT_PNETID, smc_pnet))
516 goto errattr;
517 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_NETDEV,
518 smcibdev->ndev_ifidx[port]))
519 goto errattr;
520 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_VALID, 1))
521 goto errattr;
522 port_state = smc_ib_port_active(smcibdev, port + 1);
523 if (nla_put_u8(skb, SMC_NLA_DEV_PORT_STATE, port_state))
524 goto errattr;
525 lnk_count = atomic_read(&smcibdev->lnk_cnt_by_port[port]);
526 if (nla_put_u32(skb, SMC_NLA_DEV_PORT_LNK_CNT, lnk_count))
527 goto errattr;
528 nla_nest_end(skb, port_attrs);
529 return 0;
530 errattr:
531 nla_nest_cancel(skb, port_attrs);
532 errout:
533 return -EMSGSIZE;
534 }
535
536 static bool smc_nl_handle_pci_values(const struct smc_pci_dev *smc_pci_dev,
537 struct sk_buff *skb)
538 {
539 if (nla_put_u32(skb, SMC_NLA_DEV_PCI_FID, smc_pci_dev->pci_fid))
540 return false;
541 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_CHID, smc_pci_dev->pci_pchid))
542 return false;
543 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_VENDOR, smc_pci_dev->pci_vendor))
544 return false;
545 if (nla_put_u16(skb, SMC_NLA_DEV_PCI_DEVICE, smc_pci_dev->pci_device))
546 return false;
547 if (nla_put_string(skb, SMC_NLA_DEV_PCI_ID, smc_pci_dev->pci_id))
548 return false;
549 return true;
550 }
551
552 static int smc_nl_handle_smcr_dev(struct smc_ib_device *smcibdev,
553 struct sk_buff *skb,
554 struct netlink_callback *cb)
555 {
556 char smc_ibname[IB_DEVICE_NAME_MAX];
557 struct smc_pci_dev smc_pci_dev;
558 struct pci_dev *pci_dev;
559 unsigned char is_crit;
560 struct nlattr *attrs;
561 void *nlh;
562 int i;
563
564 nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
565 &smc_gen_nl_family, NLM_F_MULTI,
566 SMC_NETLINK_GET_DEV_SMCR);
567 if (!nlh)
568 goto errmsg;
569 attrs = nla_nest_start(skb, SMC_GEN_DEV_SMCR);
570 if (!attrs)
571 goto errout;
572 is_crit = smcr_diag_is_dev_critical(&smc_lgr_list, smcibdev);
573 if (nla_put_u8(skb, SMC_NLA_DEV_IS_CRIT, is_crit))
574 goto errattr;
575 if (smcibdev->ibdev->dev.parent) {
576 memset(&smc_pci_dev, 0, sizeof(smc_pci_dev));
577 pci_dev = to_pci_dev(smcibdev->ibdev->dev.parent);
578 smc_set_pci_values(pci_dev, &smc_pci_dev);
579 if (!smc_nl_handle_pci_values(&smc_pci_dev, skb))
580 goto errattr;
581 }
582 snprintf(smc_ibname, sizeof(smc_ibname), "%s", smcibdev->ibdev->name);
583 if (nla_put_string(skb, SMC_NLA_DEV_IB_NAME, smc_ibname))
584 goto errattr;
585 for (i = 1; i <= SMC_MAX_PORTS; i++) {
586 if (!rdma_is_port_valid(smcibdev->ibdev, i))
587 continue;
588 if (smc_nl_handle_dev_port(skb, smcibdev->ibdev,
589 smcibdev, i - 1))
590 goto errattr;
591 }
592
593 nla_nest_end(skb, attrs);
594 genlmsg_end(skb, nlh);
595 return 0;
596
597 errattr:
598 nla_nest_cancel(skb, attrs);
599 errout:
600 genlmsg_cancel(skb, nlh);
601 errmsg:
602 return -EMSGSIZE;
603 }
604
605 static void smc_nl_prep_smcr_dev(struct smc_ib_devices *dev_list,
606 struct sk_buff *skb,
607 struct netlink_callback *cb)
608 {
609 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
610 struct smc_ib_device *smcibdev;
611 int snum = cb_ctx->pos[0];
612 int num = 0;
613
614 mutex_lock(&dev_list->mutex);
615 list_for_each_entry(smcibdev, &dev_list->list, list) {
616 if (num < snum)
617 goto next;
618 if (smc_nl_handle_smcr_dev(smcibdev, skb, cb))
619 goto errout;
620 next:
621 num++;
622 }
623 errout:
624 mutex_unlock(&dev_list->mutex);
625 cb_ctx->pos[0] = num;
626 }
627
628 int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb)
629 {
630 smc_nl_prep_smcr_dev(&smc_ib_devices, skb, cb);
631 return skb->len;
632 }
633
634 static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
635 {
636 struct smc_link *lnk = (struct smc_link *)priv;
637 struct smc_ib_device *smcibdev = lnk->smcibdev;
638 u8 port_idx;
639
640 switch (ibevent->event) {
641 case IB_EVENT_QP_FATAL:
642 case IB_EVENT_QP_ACCESS_ERR:
643 port_idx = ibevent->element.qp->port - 1;
644 if (port_idx >= SMC_MAX_PORTS)
645 break;
646 set_bit(port_idx, &smcibdev->port_event_mask);
647 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
648 schedule_work(&smcibdev->port_event_work);
649 break;
650 default:
651 break;
652 }
653 }
654
655 void smc_ib_destroy_queue_pair(struct smc_link *lnk)
656 {
657 if (lnk->roce_qp)
658 ib_destroy_qp(lnk->roce_qp);
659 lnk->roce_qp = NULL;
660 }
661
662 /* create a queue pair within the protection domain for a link */
663 int smc_ib_create_queue_pair(struct smc_link *lnk)
664 {
665 int sges_per_buf = (lnk->lgr->smc_version == SMC_V2) ? 2 : 1;
666 struct ib_qp_init_attr qp_attr = {
667 .event_handler = smc_ib_qp_event_handler,
668 .qp_context = lnk,
669 .send_cq = lnk->smcibdev->roce_cq_send,
670 .recv_cq = lnk->smcibdev->roce_cq_recv,
671 .srq = NULL,
672 .cap = {
673 /* include unsolicited rdma_writes as well,
674 * there are max. 2 RDMA_WRITE per 1 WR_SEND
675 */
676 .max_send_wr = SMC_WR_BUF_CNT * 3,
677 .max_recv_wr = SMC_WR_BUF_CNT * 3,
678 .max_send_sge = SMC_IB_MAX_SEND_SGE,
679 .max_recv_sge = sges_per_buf,
680 .max_inline_data = 0,
681 },
682 .sq_sig_type = IB_SIGNAL_REQ_WR,
683 .qp_type = IB_QPT_RC,
684 };
685 int rc;
686
687 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
688 rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
689 if (IS_ERR(lnk->roce_qp))
690 lnk->roce_qp = NULL;
691 else
692 smc_wr_remember_qp_attr(lnk);
693 return rc;
694 }
695
696 void smc_ib_put_memory_region(struct ib_mr *mr)
697 {
698 ib_dereg_mr(mr);
699 }
700
701 static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
702 {
703 unsigned int offset = 0;
704 int sg_num;
705
706 /* map the largest prefix of a dma mapped SG list */
707 sg_num = ib_map_mr_sg(buf_slot->mr[link_idx],
708 buf_slot->sgt[link_idx].sgl,
709 buf_slot->sgt[link_idx].orig_nents,
710 &offset, PAGE_SIZE);
711
712 return sg_num;
713 }
714
715 /* Allocate a memory region and map the dma mapped SG list of buf_slot */
716 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
717 struct smc_buf_desc *buf_slot, u8 link_idx)
718 {
719 if (buf_slot->mr[link_idx])
720 return 0; /* already done */
721
722 buf_slot->mr[link_idx] =
723 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
724 if (IS_ERR(buf_slot->mr[link_idx])) {
725 int rc;
726
727 rc = PTR_ERR(buf_slot->mr[link_idx]);
728 buf_slot->mr[link_idx] = NULL;
729 return rc;
730 }
731
732 if (smc_ib_map_mr_sg(buf_slot, link_idx) !=
733 buf_slot->sgt[link_idx].orig_nents)
734 return -EINVAL;
735
736 return 0;
737 }
738
739 bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
740 struct smc_buf_desc *buf_slot)
741 {
742 struct scatterlist *sg;
743 unsigned int i;
744 bool ret = false;
745
746 /* for now there is just one DMA address */
747 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
748 buf_slot->sgt[lnk->link_idx].nents, i) {
749 if (!sg_dma_len(sg))
750 break;
751 if (dma_need_sync(lnk->smcibdev->ibdev->dma_device,
752 sg_dma_address(sg))) {
753 ret = true;
754 goto out;
755 }
756 }
757
758 out:
759 return ret;
760 }
761
762 /* synchronize buffer usage for cpu access */
763 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
764 struct smc_buf_desc *buf_slot,
765 enum dma_data_direction data_direction)
766 {
767 struct scatterlist *sg;
768 unsigned int i;
769
770 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
771 return;
772
773 /* for now there is just one DMA address */
774 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
775 buf_slot->sgt[lnk->link_idx].nents, i) {
776 if (!sg_dma_len(sg))
777 break;
778 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
779 sg_dma_address(sg),
780 sg_dma_len(sg),
781 data_direction);
782 }
783 }
784
785 /* synchronize buffer usage for device access */
786 void smc_ib_sync_sg_for_device(struct smc_link *lnk,
787 struct smc_buf_desc *buf_slot,
788 enum dma_data_direction data_direction)
789 {
790 struct scatterlist *sg;
791 unsigned int i;
792
793 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
794 return;
795
796 /* for now there is just one DMA address */
797 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
798 buf_slot->sgt[lnk->link_idx].nents, i) {
799 if (!sg_dma_len(sg))
800 break;
801 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
802 sg_dma_address(sg),
803 sg_dma_len(sg),
804 data_direction);
805 }
806 }
807
808 /* Map a new TX or RX buffer SG-table to DMA */
809 int smc_ib_buf_map_sg(struct smc_link *lnk,
810 struct smc_buf_desc *buf_slot,
811 enum dma_data_direction data_direction)
812 {
813 int mapped_nents;
814
815 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
816 buf_slot->sgt[lnk->link_idx].sgl,
817 buf_slot->sgt[lnk->link_idx].orig_nents,
818 data_direction);
819 if (!mapped_nents)
820 return -ENOMEM;
821
822 return mapped_nents;
823 }
824
825 void smc_ib_buf_unmap_sg(struct smc_link *lnk,
826 struct smc_buf_desc *buf_slot,
827 enum dma_data_direction data_direction)
828 {
829 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
830 return; /* already unmapped */
831
832 ib_dma_unmap_sg(lnk->smcibdev->ibdev,
833 buf_slot->sgt[lnk->link_idx].sgl,
834 buf_slot->sgt[lnk->link_idx].orig_nents,
835 data_direction);
836 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
837 }
838
839 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
840 {
841 struct ib_cq_init_attr cqattr = {
842 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
843 int cqe_size_order, smc_order;
844 long rc;
845
846 mutex_lock(&smcibdev->mutex);
847 rc = 0;
848 if (smcibdev->initialized)
849 goto out;
850 /* the calculated number of cq entries fits to mlx5 cq allocation */
851 cqe_size_order = cache_line_size() == 128 ? 7 : 6;
852 smc_order = MAX_PAGE_ORDER - cqe_size_order;
853 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
854 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
855 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
856 smc_wr_tx_cq_handler, NULL,
857 smcibdev, &cqattr);
858 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
859 if (IS_ERR(smcibdev->roce_cq_send)) {
860 smcibdev->roce_cq_send = NULL;
861 goto out;
862 }
863 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
864 smc_wr_rx_cq_handler, NULL,
865 smcibdev, &cqattr);
866 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
867 if (IS_ERR(smcibdev->roce_cq_recv)) {
868 smcibdev->roce_cq_recv = NULL;
869 goto err;
870 }
871 smc_wr_add_dev(smcibdev);
872 smcibdev->initialized = 1;
873 goto out;
874
875 err:
876 ib_destroy_cq(smcibdev->roce_cq_send);
877 out:
878 mutex_unlock(&smcibdev->mutex);
879 return rc;
880 }
881
882 static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
883 {
884 mutex_lock(&smcibdev->mutex);
885 if (!smcibdev->initialized)
886 goto out;
887 smcibdev->initialized = 0;
888 ib_destroy_cq(smcibdev->roce_cq_recv);
889 ib_destroy_cq(smcibdev->roce_cq_send);
890 smc_wr_remove_dev(smcibdev);
891 out:
892 mutex_unlock(&smcibdev->mutex);
893 }
894
895 static struct ib_client smc_ib_client;
896
897 static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
898 {
899 struct ib_device *ibdev = smcibdev->ibdev;
900 struct net_device *ndev;
901
902 if (!ibdev->ops.get_netdev)
903 return;
904 ndev = ibdev->ops.get_netdev(ibdev, port + 1);
905 if (ndev) {
906 smcibdev->ndev_ifidx[port] = ndev->ifindex;
907 dev_put(ndev);
908 }
909 }
910
911 void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
912 {
913 struct smc_ib_device *smcibdev;
914 struct ib_device *libdev;
915 struct net_device *lndev;
916 u8 port_cnt;
917 int i;
918
919 mutex_lock(&smc_ib_devices.mutex);
920 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
921 port_cnt = smcibdev->ibdev->phys_port_cnt;
922 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
923 libdev = smcibdev->ibdev;
924 if (!libdev->ops.get_netdev)
925 continue;
926 lndev = libdev->ops.get_netdev(libdev, i + 1);
927 dev_put(lndev);
928 if (lndev != ndev)
929 continue;
930 if (event == NETDEV_REGISTER)
931 smcibdev->ndev_ifidx[i] = ndev->ifindex;
932 if (event == NETDEV_UNREGISTER)
933 smcibdev->ndev_ifidx[i] = 0;
934 }
935 }
936 mutex_unlock(&smc_ib_devices.mutex);
937 }
938
939 /* callback function for ib_register_client() */
940 static int smc_ib_add_dev(struct ib_device *ibdev)
941 {
942 struct smc_ib_device *smcibdev;
943 u8 port_cnt;
944 int i;
945
946 if (ibdev->node_type != RDMA_NODE_IB_CA)
947 return -EOPNOTSUPP;
948
949 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
950 if (!smcibdev)
951 return -ENOMEM;
952
953 smcibdev->ibdev = ibdev;
954 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
955 atomic_set(&smcibdev->lnk_cnt, 0);
956 init_waitqueue_head(&smcibdev->lnks_deleted);
957 mutex_init(&smcibdev->mutex);
958 mutex_lock(&smc_ib_devices.mutex);
959 list_add_tail(&smcibdev->list, &smc_ib_devices.list);
960 mutex_unlock(&smc_ib_devices.mutex);
961 ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
962 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
963 smc_ib_global_event_handler);
964 ib_register_event_handler(&smcibdev->event_handler);
965
966 /* trigger reading of the port attributes */
967 port_cnt = smcibdev->ibdev->phys_port_cnt;
968 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
969 smcibdev->ibdev->name, port_cnt);
970 for (i = 0;
971 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
972 i++) {
973 set_bit(i, &smcibdev->port_event_mask);
974 /* determine pnetids of the port */
975 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
976 smcibdev->pnetid[i]))
977 smc_pnetid_by_table_ib(smcibdev, i + 1);
978 smc_copy_netdev_ifindex(smcibdev, i);
979 pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
980 "%.16s%s\n",
981 smcibdev->ibdev->name, i + 1,
982 smcibdev->pnetid[i],
983 smcibdev->pnetid_by_user[i] ?
984 " (user defined)" :
985 "");
986 }
987 schedule_work(&smcibdev->port_event_work);
988 return 0;
989 }
990
991 /* callback function for ib_unregister_client() */
992 static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
993 {
994 struct smc_ib_device *smcibdev = client_data;
995
996 mutex_lock(&smc_ib_devices.mutex);
997 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
998 mutex_unlock(&smc_ib_devices.mutex);
999 pr_warn_ratelimited("smc: removing ib device %s\n",
1000 smcibdev->ibdev->name);
1001 smc_smcr_terminate_all(smcibdev);
1002 smc_ib_cleanup_per_ibdev(smcibdev);
1003 ib_unregister_event_handler(&smcibdev->event_handler);
1004 cancel_work_sync(&smcibdev->port_event_work);
1005 kfree(smcibdev);
1006 }
1007
1008 static struct ib_client smc_ib_client = {
1009 .name = "smc_ib",
1010 .add = smc_ib_add_dev,
1011 .remove = smc_ib_remove_dev,
1012 };
1013
1014 int __init smc_ib_register_client(void)
1015 {
1016 smc_ib_init_local_systemid();
1017 return ib_register_client(&smc_ib_client);
1018 }
1019
1020 void smc_ib_unregister_client(void)
1021 {
1022 ib_unregister_client(&smc_ib_client);
1023 }
1024
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