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