Loading...
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(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
222out_rt:
223 ip_rt_put(rt);
224out:
225 return -ENOENT;
226}
227
228static 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 }
269out:
270 return -ENODEV;
271}
272
273/* determine the gid for an ib-device port and vlan id */
274int 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 */
307static 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 */
333static 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
358static 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);
376out:
377 return rc;
378}
379
380/* process context wrapper for might_sleep smc_ib_remember_port_attr */
381static 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 */
402static 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
451void 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
458int 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
469static 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 }
491out:
492 spin_unlock_bh(&smc_lgr->lock);
493 return rc;
494}
495
496static 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;
530errattr:
531 nla_nest_cancel(skb, port_attrs);
532errout:
533 return -EMSGSIZE;
534}
535
536static 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
552static 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
597errattr:
598 nla_nest_cancel(skb, attrs);
599errout:
600 genlmsg_cancel(skb, nlh);
601errmsg:
602 return -EMSGSIZE;
603}
604
605static 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;
620next:
621 num++;
622 }
623errout:
624 mutex_unlock(&dev_list->mutex);
625 cb_ctx->pos[0] = num;
626}
627
628int 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
634static 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
655void 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 */
663int 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
696void smc_ib_put_memory_region(struct ib_mr *mr)
697{
698 ib_dereg_mr(mr);
699}
700
701static 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 */
716int 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
739bool 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
758out:
759 return ret;
760}
761
762/* synchronize buffer usage for cpu access */
763void 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 */
786void 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 */
809int 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
825void 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
839long 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
875err:
876 ib_destroy_cq(smcibdev->roce_cq_send);
877out:
878 mutex_unlock(&smcibdev->mutex);
879 return rc;
880}
881
882static 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);
891out:
892 mutex_unlock(&smcibdev->mutex);
893}
894
895static struct ib_client smc_ib_client;
896
897static 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 ndev = ib_device_get_netdev(ibdev, port + 1);
903 if (ndev) {
904 smcibdev->ndev_ifidx[port] = ndev->ifindex;
905 dev_put(ndev);
906 }
907}
908
909void smc_ib_ndev_change(struct net_device *ndev, unsigned long event)
910{
911 struct smc_ib_device *smcibdev;
912 struct ib_device *libdev;
913 struct net_device *lndev;
914 u8 port_cnt;
915 int i;
916
917 mutex_lock(&smc_ib_devices.mutex);
918 list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
919 port_cnt = smcibdev->ibdev->phys_port_cnt;
920 for (i = 0; i < min_t(size_t, port_cnt, SMC_MAX_PORTS); i++) {
921 libdev = smcibdev->ibdev;
922 lndev = ib_device_get_netdev(libdev, i + 1);
923 dev_put(lndev);
924 if (lndev != ndev)
925 continue;
926 if (event == NETDEV_REGISTER)
927 smcibdev->ndev_ifidx[i] = ndev->ifindex;
928 if (event == NETDEV_UNREGISTER)
929 smcibdev->ndev_ifidx[i] = 0;
930 }
931 }
932 mutex_unlock(&smc_ib_devices.mutex);
933}
934
935/* callback function for ib_register_client() */
936static int smc_ib_add_dev(struct ib_device *ibdev)
937{
938 struct smc_ib_device *smcibdev;
939 u8 port_cnt;
940 int i;
941
942 if (ibdev->node_type != RDMA_NODE_IB_CA)
943 return -EOPNOTSUPP;
944
945 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
946 if (!smcibdev)
947 return -ENOMEM;
948
949 smcibdev->ibdev = ibdev;
950 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
951 atomic_set(&smcibdev->lnk_cnt, 0);
952 init_waitqueue_head(&smcibdev->lnks_deleted);
953 mutex_init(&smcibdev->mutex);
954 mutex_lock(&smc_ib_devices.mutex);
955 list_add_tail(&smcibdev->list, &smc_ib_devices.list);
956 mutex_unlock(&smc_ib_devices.mutex);
957 ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
958 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
959 smc_ib_global_event_handler);
960 ib_register_event_handler(&smcibdev->event_handler);
961
962 /* trigger reading of the port attributes */
963 port_cnt = smcibdev->ibdev->phys_port_cnt;
964 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
965 smcibdev->ibdev->name, port_cnt);
966 for (i = 0;
967 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
968 i++) {
969 set_bit(i, &smcibdev->port_event_mask);
970 /* determine pnetids of the port */
971 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
972 smcibdev->pnetid[i]))
973 smc_pnetid_by_table_ib(smcibdev, i + 1);
974 smc_copy_netdev_ifindex(smcibdev, i);
975 pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
976 "%.16s%s\n",
977 smcibdev->ibdev->name, i + 1,
978 smcibdev->pnetid[i],
979 smcibdev->pnetid_by_user[i] ?
980 " (user defined)" :
981 "");
982 }
983 schedule_work(&smcibdev->port_event_work);
984 return 0;
985}
986
987/* callback function for ib_unregister_client() */
988static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
989{
990 struct smc_ib_device *smcibdev = client_data;
991
992 mutex_lock(&smc_ib_devices.mutex);
993 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
994 mutex_unlock(&smc_ib_devices.mutex);
995 pr_warn_ratelimited("smc: removing ib device %s\n",
996 smcibdev->ibdev->name);
997 smc_smcr_terminate_all(smcibdev);
998 smc_ib_cleanup_per_ibdev(smcibdev);
999 ib_unregister_event_handler(&smcibdev->event_handler);
1000 cancel_work_sync(&smcibdev->port_event_work);
1001 kfree(smcibdev);
1002}
1003
1004static struct ib_client smc_ib_client = {
1005 .name = "smc_ib",
1006 .add = smc_ib_add_dev,
1007 .remove = smc_ib_remove_dev,
1008};
1009
1010int __init smc_ib_register_client(void)
1011{
1012 smc_ib_init_local_systemid();
1013 return ib_register_client(&smc_ib_client);
1014}
1015
1016void smc_ib_unregister_client(void)
1017{
1018 ib_unregister_client(&smc_ib_client);
1019}
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 <linux/wait.h>
19#include <linux/mutex.h>
20#include <rdma/ib_verbs.h>
21#include <rdma/ib_cache.h>
22
23#include "smc_pnet.h"
24#include "smc_ib.h"
25#include "smc_core.h"
26#include "smc_wr.h"
27#include "smc.h"
28
29#define SMC_MAX_CQE 32766 /* max. # of completion queue elements */
30
31#define SMC_QP_MIN_RNR_TIMER 5
32#define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */
33#define SMC_QP_RETRY_CNT 7 /* 7: infinite */
34#define SMC_QP_RNR_RETRY 7 /* 7: infinite */
35
36struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */
37 .mutex = __MUTEX_INITIALIZER(smc_ib_devices.mutex),
38 .list = LIST_HEAD_INIT(smc_ib_devices.list),
39};
40
41u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */
42
43static int smc_ib_modify_qp_init(struct smc_link *lnk)
44{
45 struct ib_qp_attr qp_attr;
46
47 memset(&qp_attr, 0, sizeof(qp_attr));
48 qp_attr.qp_state = IB_QPS_INIT;
49 qp_attr.pkey_index = 0;
50 qp_attr.port_num = lnk->ibport;
51 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE
52 | IB_ACCESS_REMOTE_WRITE;
53 return ib_modify_qp(lnk->roce_qp, &qp_attr,
54 IB_QP_STATE | IB_QP_PKEY_INDEX |
55 IB_QP_ACCESS_FLAGS | IB_QP_PORT);
56}
57
58static int smc_ib_modify_qp_rtr(struct smc_link *lnk)
59{
60 enum ib_qp_attr_mask qp_attr_mask =
61 IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN |
62 IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER;
63 struct ib_qp_attr qp_attr;
64
65 memset(&qp_attr, 0, sizeof(qp_attr));
66 qp_attr.qp_state = IB_QPS_RTR;
67 qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu);
68 qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE;
69 rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport);
70 rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0);
71 rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid);
72 memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac,
73 sizeof(lnk->peer_mac));
74 qp_attr.dest_qp_num = lnk->peer_qpn;
75 qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */
76 qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming
77 * requests
78 */
79 qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER;
80
81 return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask);
82}
83
84int smc_ib_modify_qp_rts(struct smc_link *lnk)
85{
86 struct ib_qp_attr qp_attr;
87
88 memset(&qp_attr, 0, sizeof(qp_attr));
89 qp_attr.qp_state = IB_QPS_RTS;
90 qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */
91 qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */
92 qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */
93 qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */
94 qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and
95 * atomic ops allowed
96 */
97 return ib_modify_qp(lnk->roce_qp, &qp_attr,
98 IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT |
99 IB_QP_SQ_PSN | IB_QP_RNR_RETRY |
100 IB_QP_MAX_QP_RD_ATOMIC);
101}
102
103int smc_ib_modify_qp_reset(struct smc_link *lnk)
104{
105 struct ib_qp_attr qp_attr;
106
107 memset(&qp_attr, 0, sizeof(qp_attr));
108 qp_attr.qp_state = IB_QPS_RESET;
109 return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE);
110}
111
112int smc_ib_ready_link(struct smc_link *lnk)
113{
114 struct smc_link_group *lgr = smc_get_lgr(lnk);
115 int rc = 0;
116
117 rc = smc_ib_modify_qp_init(lnk);
118 if (rc)
119 goto out;
120
121 rc = smc_ib_modify_qp_rtr(lnk);
122 if (rc)
123 goto out;
124 smc_wr_remember_qp_attr(lnk);
125 rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv,
126 IB_CQ_SOLICITED_MASK);
127 if (rc)
128 goto out;
129 rc = smc_wr_rx_post_init(lnk);
130 if (rc)
131 goto out;
132 smc_wr_remember_qp_attr(lnk);
133
134 if (lgr->role == SMC_SERV) {
135 rc = smc_ib_modify_qp_rts(lnk);
136 if (rc)
137 goto out;
138 smc_wr_remember_qp_attr(lnk);
139 }
140out:
141 return rc;
142}
143
144static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport)
145{
146 const struct ib_gid_attr *attr;
147 int rc;
148
149 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0);
150 if (IS_ERR(attr))
151 return -ENODEV;
152
153 rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]);
154 rdma_put_gid_attr(attr);
155 return rc;
156}
157
158/* Create an identifier unique for this instance of SMC-R.
159 * The MAC-address of the first active registered IB device
160 * plus a random 2-byte number is used to create this identifier.
161 * This name is delivered to the peer during connection initialization.
162 */
163static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev,
164 u8 ibport)
165{
166 memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1],
167 sizeof(smcibdev->mac[ibport - 1]));
168}
169
170bool smc_ib_is_valid_local_systemid(void)
171{
172 return !is_zero_ether_addr(&local_systemid[2]);
173}
174
175static void smc_ib_init_local_systemid(void)
176{
177 get_random_bytes(&local_systemid[0], 2);
178}
179
180bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport)
181{
182 return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE;
183}
184
185/* determine the gid for an ib-device port and vlan id */
186int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
187 unsigned short vlan_id, u8 gid[], u8 *sgid_index)
188{
189 const struct ib_gid_attr *attr;
190 const struct net_device *ndev;
191 int i;
192
193 for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) {
194 attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i);
195 if (IS_ERR(attr))
196 continue;
197
198 rcu_read_lock();
199 ndev = rdma_read_gid_attr_ndev_rcu(attr);
200 if (!IS_ERR(ndev) &&
201 ((!vlan_id && !is_vlan_dev(attr->ndev)) ||
202 (vlan_id && is_vlan_dev(attr->ndev) &&
203 vlan_dev_vlan_id(attr->ndev) == vlan_id)) &&
204 attr->gid_type == IB_GID_TYPE_ROCE) {
205 rcu_read_unlock();
206 if (gid)
207 memcpy(gid, &attr->gid, SMC_GID_SIZE);
208 if (sgid_index)
209 *sgid_index = attr->index;
210 rdma_put_gid_attr(attr);
211 return 0;
212 }
213 rcu_read_unlock();
214 rdma_put_gid_attr(attr);
215 }
216 return -ENODEV;
217}
218
219static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport)
220{
221 int rc;
222
223 memset(&smcibdev->pattr[ibport - 1], 0,
224 sizeof(smcibdev->pattr[ibport - 1]));
225 rc = ib_query_port(smcibdev->ibdev, ibport,
226 &smcibdev->pattr[ibport - 1]);
227 if (rc)
228 goto out;
229 /* the SMC protocol requires specification of the RoCE MAC address */
230 rc = smc_ib_fill_mac(smcibdev, ibport);
231 if (rc)
232 goto out;
233 if (!smc_ib_is_valid_local_systemid() &&
234 smc_ib_port_active(smcibdev, ibport))
235 /* create unique system identifier */
236 smc_ib_define_local_systemid(smcibdev, ibport);
237out:
238 return rc;
239}
240
241/* process context wrapper for might_sleep smc_ib_remember_port_attr */
242static void smc_ib_port_event_work(struct work_struct *work)
243{
244 struct smc_ib_device *smcibdev = container_of(
245 work, struct smc_ib_device, port_event_work);
246 u8 port_idx;
247
248 for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) {
249 smc_ib_remember_port_attr(smcibdev, port_idx + 1);
250 clear_bit(port_idx, &smcibdev->port_event_mask);
251 if (!smc_ib_port_active(smcibdev, port_idx + 1)) {
252 set_bit(port_idx, smcibdev->ports_going_away);
253 smcr_port_err(smcibdev, port_idx + 1);
254 } else {
255 clear_bit(port_idx, smcibdev->ports_going_away);
256 smcr_port_add(smcibdev, port_idx + 1);
257 }
258 }
259}
260
261/* can be called in IRQ context */
262static void smc_ib_global_event_handler(struct ib_event_handler *handler,
263 struct ib_event *ibevent)
264{
265 struct smc_ib_device *smcibdev;
266 bool schedule = false;
267 u8 port_idx;
268
269 smcibdev = container_of(handler, struct smc_ib_device, event_handler);
270
271 switch (ibevent->event) {
272 case IB_EVENT_DEVICE_FATAL:
273 /* terminate all ports on device */
274 for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) {
275 set_bit(port_idx, &smcibdev->port_event_mask);
276 if (!test_and_set_bit(port_idx,
277 smcibdev->ports_going_away))
278 schedule = true;
279 }
280 if (schedule)
281 schedule_work(&smcibdev->port_event_work);
282 break;
283 case IB_EVENT_PORT_ACTIVE:
284 port_idx = ibevent->element.port_num - 1;
285 if (port_idx >= SMC_MAX_PORTS)
286 break;
287 set_bit(port_idx, &smcibdev->port_event_mask);
288 if (test_and_clear_bit(port_idx, smcibdev->ports_going_away))
289 schedule_work(&smcibdev->port_event_work);
290 break;
291 case IB_EVENT_PORT_ERR:
292 port_idx = ibevent->element.port_num - 1;
293 if (port_idx >= SMC_MAX_PORTS)
294 break;
295 set_bit(port_idx, &smcibdev->port_event_mask);
296 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
297 schedule_work(&smcibdev->port_event_work);
298 break;
299 case IB_EVENT_GID_CHANGE:
300 port_idx = ibevent->element.port_num - 1;
301 if (port_idx >= SMC_MAX_PORTS)
302 break;
303 set_bit(port_idx, &smcibdev->port_event_mask);
304 schedule_work(&smcibdev->port_event_work);
305 break;
306 default:
307 break;
308 }
309}
310
311void smc_ib_dealloc_protection_domain(struct smc_link *lnk)
312{
313 if (lnk->roce_pd)
314 ib_dealloc_pd(lnk->roce_pd);
315 lnk->roce_pd = NULL;
316}
317
318int smc_ib_create_protection_domain(struct smc_link *lnk)
319{
320 int rc;
321
322 lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0);
323 rc = PTR_ERR_OR_ZERO(lnk->roce_pd);
324 if (IS_ERR(lnk->roce_pd))
325 lnk->roce_pd = NULL;
326 return rc;
327}
328
329static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv)
330{
331 struct smc_link *lnk = (struct smc_link *)priv;
332 struct smc_ib_device *smcibdev = lnk->smcibdev;
333 u8 port_idx;
334
335 switch (ibevent->event) {
336 case IB_EVENT_QP_FATAL:
337 case IB_EVENT_QP_ACCESS_ERR:
338 port_idx = ibevent->element.qp->port - 1;
339 if (port_idx >= SMC_MAX_PORTS)
340 break;
341 set_bit(port_idx, &smcibdev->port_event_mask);
342 if (!test_and_set_bit(port_idx, smcibdev->ports_going_away))
343 schedule_work(&smcibdev->port_event_work);
344 break;
345 default:
346 break;
347 }
348}
349
350void smc_ib_destroy_queue_pair(struct smc_link *lnk)
351{
352 if (lnk->roce_qp)
353 ib_destroy_qp(lnk->roce_qp);
354 lnk->roce_qp = NULL;
355}
356
357/* create a queue pair within the protection domain for a link */
358int smc_ib_create_queue_pair(struct smc_link *lnk)
359{
360 struct ib_qp_init_attr qp_attr = {
361 .event_handler = smc_ib_qp_event_handler,
362 .qp_context = lnk,
363 .send_cq = lnk->smcibdev->roce_cq_send,
364 .recv_cq = lnk->smcibdev->roce_cq_recv,
365 .srq = NULL,
366 .cap = {
367 /* include unsolicited rdma_writes as well,
368 * there are max. 2 RDMA_WRITE per 1 WR_SEND
369 */
370 .max_send_wr = SMC_WR_BUF_CNT * 3,
371 .max_recv_wr = SMC_WR_BUF_CNT * 3,
372 .max_send_sge = SMC_IB_MAX_SEND_SGE,
373 .max_recv_sge = 1,
374 },
375 .sq_sig_type = IB_SIGNAL_REQ_WR,
376 .qp_type = IB_QPT_RC,
377 };
378 int rc;
379
380 lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr);
381 rc = PTR_ERR_OR_ZERO(lnk->roce_qp);
382 if (IS_ERR(lnk->roce_qp))
383 lnk->roce_qp = NULL;
384 else
385 smc_wr_remember_qp_attr(lnk);
386 return rc;
387}
388
389void smc_ib_put_memory_region(struct ib_mr *mr)
390{
391 ib_dereg_mr(mr);
392}
393
394static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
395{
396 unsigned int offset = 0;
397 int sg_num;
398
399 /* map the largest prefix of a dma mapped SG list */
400 sg_num = ib_map_mr_sg(buf_slot->mr_rx[link_idx],
401 buf_slot->sgt[link_idx].sgl,
402 buf_slot->sgt[link_idx].orig_nents,
403 &offset, PAGE_SIZE);
404
405 return sg_num;
406}
407
408/* Allocate a memory region and map the dma mapped SG list of buf_slot */
409int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
410 struct smc_buf_desc *buf_slot, u8 link_idx)
411{
412 if (buf_slot->mr_rx[link_idx])
413 return 0; /* already done */
414
415 buf_slot->mr_rx[link_idx] =
416 ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order);
417 if (IS_ERR(buf_slot->mr_rx[link_idx])) {
418 int rc;
419
420 rc = PTR_ERR(buf_slot->mr_rx[link_idx]);
421 buf_slot->mr_rx[link_idx] = NULL;
422 return rc;
423 }
424
425 if (smc_ib_map_mr_sg(buf_slot, link_idx) != 1)
426 return -EINVAL;
427
428 return 0;
429}
430
431/* synchronize buffer usage for cpu access */
432void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
433 struct smc_buf_desc *buf_slot,
434 enum dma_data_direction data_direction)
435{
436 struct scatterlist *sg;
437 unsigned int i;
438
439 /* for now there is just one DMA address */
440 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
441 buf_slot->sgt[lnk->link_idx].nents, i) {
442 if (!sg_dma_len(sg))
443 break;
444 ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev,
445 sg_dma_address(sg),
446 sg_dma_len(sg),
447 data_direction);
448 }
449}
450
451/* synchronize buffer usage for device access */
452void smc_ib_sync_sg_for_device(struct smc_link *lnk,
453 struct smc_buf_desc *buf_slot,
454 enum dma_data_direction data_direction)
455{
456 struct scatterlist *sg;
457 unsigned int i;
458
459 /* for now there is just one DMA address */
460 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
461 buf_slot->sgt[lnk->link_idx].nents, i) {
462 if (!sg_dma_len(sg))
463 break;
464 ib_dma_sync_single_for_device(lnk->smcibdev->ibdev,
465 sg_dma_address(sg),
466 sg_dma_len(sg),
467 data_direction);
468 }
469}
470
471/* Map a new TX or RX buffer SG-table to DMA */
472int smc_ib_buf_map_sg(struct smc_link *lnk,
473 struct smc_buf_desc *buf_slot,
474 enum dma_data_direction data_direction)
475{
476 int mapped_nents;
477
478 mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev,
479 buf_slot->sgt[lnk->link_idx].sgl,
480 buf_slot->sgt[lnk->link_idx].orig_nents,
481 data_direction);
482 if (!mapped_nents)
483 return -ENOMEM;
484
485 return mapped_nents;
486}
487
488void smc_ib_buf_unmap_sg(struct smc_link *lnk,
489 struct smc_buf_desc *buf_slot,
490 enum dma_data_direction data_direction)
491{
492 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
493 return; /* already unmapped */
494
495 ib_dma_unmap_sg(lnk->smcibdev->ibdev,
496 buf_slot->sgt[lnk->link_idx].sgl,
497 buf_slot->sgt[lnk->link_idx].orig_nents,
498 data_direction);
499 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
500}
501
502long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
503{
504 struct ib_cq_init_attr cqattr = {
505 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
506 int cqe_size_order, smc_order;
507 long rc;
508
509 mutex_lock(&smcibdev->mutex);
510 rc = 0;
511 if (smcibdev->initialized)
512 goto out;
513 /* the calculated number of cq entries fits to mlx5 cq allocation */
514 cqe_size_order = cache_line_size() == 128 ? 7 : 6;
515 smc_order = MAX_ORDER - cqe_size_order - 1;
516 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
517 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
518 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
519 smc_wr_tx_cq_handler, NULL,
520 smcibdev, &cqattr);
521 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send);
522 if (IS_ERR(smcibdev->roce_cq_send)) {
523 smcibdev->roce_cq_send = NULL;
524 goto out;
525 }
526 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
527 smc_wr_rx_cq_handler, NULL,
528 smcibdev, &cqattr);
529 rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv);
530 if (IS_ERR(smcibdev->roce_cq_recv)) {
531 smcibdev->roce_cq_recv = NULL;
532 goto err;
533 }
534 smc_wr_add_dev(smcibdev);
535 smcibdev->initialized = 1;
536 goto out;
537
538err:
539 ib_destroy_cq(smcibdev->roce_cq_send);
540out:
541 mutex_unlock(&smcibdev->mutex);
542 return rc;
543}
544
545static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
546{
547 mutex_lock(&smcibdev->mutex);
548 if (!smcibdev->initialized)
549 goto out;
550 smcibdev->initialized = 0;
551 ib_destroy_cq(smcibdev->roce_cq_recv);
552 ib_destroy_cq(smcibdev->roce_cq_send);
553 smc_wr_remove_dev(smcibdev);
554out:
555 mutex_unlock(&smcibdev->mutex);
556}
557
558static struct ib_client smc_ib_client;
559
560/* callback function for ib_register_client() */
561static int smc_ib_add_dev(struct ib_device *ibdev)
562{
563 struct smc_ib_device *smcibdev;
564 u8 port_cnt;
565 int i;
566
567 if (ibdev->node_type != RDMA_NODE_IB_CA)
568 return -EOPNOTSUPP;
569
570 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
571 if (!smcibdev)
572 return -ENOMEM;
573
574 smcibdev->ibdev = ibdev;
575 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
576 atomic_set(&smcibdev->lnk_cnt, 0);
577 init_waitqueue_head(&smcibdev->lnks_deleted);
578 mutex_init(&smcibdev->mutex);
579 mutex_lock(&smc_ib_devices.mutex);
580 list_add_tail(&smcibdev->list, &smc_ib_devices.list);
581 mutex_unlock(&smc_ib_devices.mutex);
582 ib_set_client_data(ibdev, &smc_ib_client, smcibdev);
583 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
584 smc_ib_global_event_handler);
585 ib_register_event_handler(&smcibdev->event_handler);
586
587 /* trigger reading of the port attributes */
588 port_cnt = smcibdev->ibdev->phys_port_cnt;
589 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
590 smcibdev->ibdev->name, port_cnt);
591 for (i = 0;
592 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
593 i++) {
594 set_bit(i, &smcibdev->port_event_mask);
595 /* determine pnetids of the port */
596 if (smc_pnetid_by_dev_port(ibdev->dev.parent, i,
597 smcibdev->pnetid[i]))
598 smc_pnetid_by_table_ib(smcibdev, i + 1);
599 pr_warn_ratelimited("smc: ib device %s port %d has pnetid "
600 "%.16s%s\n",
601 smcibdev->ibdev->name, i + 1,
602 smcibdev->pnetid[i],
603 smcibdev->pnetid_by_user[i] ?
604 " (user defined)" :
605 "");
606 }
607 schedule_work(&smcibdev->port_event_work);
608 return 0;
609}
610
611/* callback function for ib_unregister_client() */
612static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
613{
614 struct smc_ib_device *smcibdev = client_data;
615
616 mutex_lock(&smc_ib_devices.mutex);
617 list_del_init(&smcibdev->list); /* remove from smc_ib_devices */
618 mutex_unlock(&smc_ib_devices.mutex);
619 pr_warn_ratelimited("smc: removing ib device %s\n",
620 smcibdev->ibdev->name);
621 smc_smcr_terminate_all(smcibdev);
622 smc_ib_cleanup_per_ibdev(smcibdev);
623 ib_unregister_event_handler(&smcibdev->event_handler);
624 cancel_work_sync(&smcibdev->port_event_work);
625 kfree(smcibdev);
626}
627
628static struct ib_client smc_ib_client = {
629 .name = "smc_ib",
630 .add = smc_ib_add_dev,
631 .remove = smc_ib_remove_dev,
632};
633
634int __init smc_ib_register_client(void)
635{
636 smc_ib_init_local_systemid();
637 return ib_register_client(&smc_ib_client);
638}
639
640void smc_ib_unregister_client(void)
641{
642 ib_unregister_client(&smc_ib_client);
643}