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(qp: lnk->roce_qp, qp_attr: &qp_attr,
58 qp_attr_mask: 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(attr: &qp_attr.ah_attr, port_num: 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(attr: &qp_attr.ah_attr, NULL, flow_label: 0, sgid_index: lnk->sgid_index, hop_limit: hop_lim, traffic_class: 0);
78 rdma_ah_set_dgid_raw(attr: &qp_attr.ah_attr, dgid: 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(qp: lnk->roce_qp, qp_attr: &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(qp: lnk->roce_qp, qp_attr: &qp_attr,
109 qp_attr_mask: 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(qp: lnk->roce_qp, qp_attr: &qp_attr, qp_attr_mask: IB_QP_STATE);
121}
122
123int smc_ib_ready_link(struct smc_link *lnk)
124{
125 struct smc_link_group *lgr = smc_get_lgr(link: 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(cq: lnk->smcibdev->roce_cq_recv,
137 flags: IB_CQ_SOLICITED_MASK);
138 if (rc)
139 goto out;
140 rc = smc_wr_rx_post_init(link: 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(device: smcibdev->ibdev, port_num: ibport, index: 0);
161 if (IS_ERR(ptr: attr))
162 return -ENODEV;
163
164 rc = rdma_read_gid_l2_fields(attr, NULL, smac: 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(addr: &local_systemid[2]);
184}
185
186static void smc_ib_init_local_systemid(void)
187{
188 get_random_bytes(buf: &local_systemid[0], len: 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, flp: &fl4, NULL);
209 if (IS_ERR(ptr: 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(dst: &rt->dst, daddr: &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(gid: (u8 *)&attr->gid) != cpu_to_be32(INADDR_NONE)) {
242 struct in_device *in_dev = __in_dev_get_rcu(dev: ndev);
243 struct net *net = dev_net(dev: 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(addr: 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, saddr: smcrv2->saddr,
258 daddr: smcrv2->daddr,
259 nexthop_mac: smcrv2->nexthop_mac,
260 uses_gateway: &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(device: smcibdev->ibdev, port_num: ibport, index: i);
284 if (IS_ERR(ptr: attr))
285 continue;
286
287 rcu_read_lock();
288 ndev = rdma_read_gid_attr_ndev_rcu(attr);
289 if (!IS_ERR(ptr: ndev) &&
290 ((!vlan_id && !is_vlan_dev(dev: ndev)) ||
291 (vlan_id && is_vlan_dev(dev: ndev) &&
292 vlan_dev_vlan_id(dev: 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(device: smcibdev->ibdev, port_num: ibport, index: i);
316 if (IS_ERR(ptr: 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(addr: (const struct in6_addr *)&attr->gid)
323 & IPV6_ADDR_LINKLOCAL)))
324 if (!memcmp(p: gid, q: &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(lock: &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(head: &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(gid: lgr->lnk[i].gid,
350 smcrv2: lgr->smc_version == SMC_V2,
351 smcibdev, ibport))
352 smcr_port_err(smcibdev, ibport);
353 }
354 }
355 spin_unlock_bh(lock: &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(device: smcibdev->ibdev, port_num: ibport,
365 port_attr: &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, ibport: port_idx + 1);
389 clear_bit(nr: port_idx, addr: &smcibdev->port_event_mask);
390 if (!smc_ib_port_active(smcibdev, ibport: port_idx + 1)) {
391 set_bit(nr: port_idx, addr: smcibdev->ports_going_away);
392 smcr_port_err(smcibdev, ibport: port_idx + 1);
393 } else {
394 clear_bit(nr: port_idx, addr: smcibdev->ports_going_away);
395 smcr_port_add(smcibdev, ibport: port_idx + 1);
396 smc_ib_gid_check(smcibdev, ibport: 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(nr: port_idx, addr: &smcibdev->port_event_mask);
416 if (!test_and_set_bit(nr: port_idx,
417 addr: smcibdev->ports_going_away))
418 schedule = true;
419 }
420 if (schedule)
421 schedule_work(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(nr: port_idx, addr: &smcibdev->port_event_mask);
428 if (test_and_clear_bit(nr: port_idx, addr: smcibdev->ports_going_away))
429 schedule_work(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(nr: port_idx, addr: &smcibdev->port_event_mask);
436 if (!test_and_set_bit(nr: port_idx, addr: smcibdev->ports_going_away))
437 schedule_work(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(nr: port_idx, addr: &smcibdev->port_event_mask);
444 schedule_work(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(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(ptr: lnk->roce_pd);
464 if (IS_ERR(ptr: 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(lock: &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(lock: &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, attrtype: SMC_NLA_DEV_PORT + port);
507 if (!port_attrs)
508 goto errout;
509
510 if (nla_put_u8(skb, attrtype: SMC_NLA_DEV_PORT_PNET_USR,
511 value: 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, attrtype: SMC_NLA_DEV_PORT_PNETID, str: smc_pnet))
516 goto errattr;
517 if (nla_put_u32(skb, attrtype: SMC_NLA_DEV_PORT_NETDEV,
518 value: smcibdev->ndev_ifidx[port]))
519 goto errattr;
520 if (nla_put_u8(skb, attrtype: SMC_NLA_DEV_PORT_VALID, value: 1))
521 goto errattr;
522 port_state = smc_ib_port_active(smcibdev, ibport: port + 1);
523 if (nla_put_u8(skb, attrtype: SMC_NLA_DEV_PORT_STATE, value: port_state))
524 goto errattr;
525 lnk_count = atomic_read(v: &smcibdev->lnk_cnt_by_port[port]);
526 if (nla_put_u32(skb, attrtype: SMC_NLA_DEV_PORT_LNK_CNT, value: lnk_count))
527 goto errattr;
528 nla_nest_end(skb, start: port_attrs);
529 return 0;
530errattr:
531 nla_nest_cancel(skb, start: 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, attrtype: SMC_NLA_DEV_PCI_FID, value: smc_pci_dev->pci_fid))
540 return false;
541 if (nla_put_u16(skb, attrtype: SMC_NLA_DEV_PCI_CHID, value: smc_pci_dev->pci_pchid))
542 return false;
543 if (nla_put_u16(skb, attrtype: SMC_NLA_DEV_PCI_VENDOR, value: smc_pci_dev->pci_vendor))
544 return false;
545 if (nla_put_u16(skb, attrtype: SMC_NLA_DEV_PCI_DEVICE, value: smc_pci_dev->pci_device))
546 return false;
547 if (nla_put_string(skb, attrtype: SMC_NLA_DEV_PCI_ID, str: 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, seq: cb->nlh->nlmsg_seq,
565 family: &smc_gen_nl_family, NLM_F_MULTI,
566 cmd: SMC_NETLINK_GET_DEV_SMCR);
567 if (!nlh)
568 goto errmsg;
569 attrs = nla_nest_start(skb, attrtype: SMC_GEN_DEV_SMCR);
570 if (!attrs)
571 goto errout;
572 is_crit = smcr_diag_is_dev_critical(smc_lgr: &smc_lgr_list, smcibdev);
573 if (nla_put_u8(skb, attrtype: SMC_NLA_DEV_IS_CRIT, value: 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_dev: &smc_pci_dev);
579 if (!smc_nl_handle_pci_values(smc_pci_dev: &smc_pci_dev, skb))
580 goto errattr;
581 }
582 snprintf(buf: smc_ibname, size: sizeof(smc_ibname), fmt: "%s", smcibdev->ibdev->name);
583 if (nla_put_string(skb, attrtype: SMC_NLA_DEV_IB_NAME, str: smc_ibname))
584 goto errattr;
585 for (i = 1; i <= SMC_MAX_PORTS; i++) {
586 if (!rdma_is_port_valid(device: smcibdev->ibdev, port: i))
587 continue;
588 if (smc_nl_handle_dev_port(skb, ibdev: smcibdev->ibdev,
589 smcibdev, port: i - 1))
590 goto errattr;
591 }
592
593 nla_nest_end(skb, start: attrs);
594 genlmsg_end(skb, hdr: nlh);
595 return 0;
596
597errattr:
598 nla_nest_cancel(skb, start: attrs);
599errout:
600 genlmsg_cancel(skb, hdr: 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(c: 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(lock: &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(dev_list: &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(nr: port_idx, addr: &smcibdev->port_event_mask);
647 if (!test_and_set_bit(nr: port_idx, addr: smcibdev->ports_going_away))
648 schedule_work(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(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 struct ib_qp_init_attr qp_attr = {
666 .event_handler = smc_ib_qp_event_handler,
667 .qp_context = lnk,
668 .send_cq = lnk->smcibdev->roce_cq_send,
669 .recv_cq = lnk->smcibdev->roce_cq_recv,
670 .srq = NULL,
671 .cap = {
672 .max_send_sge = SMC_IB_MAX_SEND_SGE,
673 .max_recv_sge = lnk->wr_rx_sge_cnt,
674 .max_inline_data = 0,
675 },
676 .sq_sig_type = IB_SIGNAL_REQ_WR,
677 .qp_type = IB_QPT_RC,
678 };
679 int rc;
680
681 /* include unsolicited rdma_writes as well,
682 * there are max. 2 RDMA_WRITE per 1 WR_SEND
683 */
684 qp_attr.cap.max_send_wr = 3 * lnk->lgr->max_send_wr;
685 qp_attr.cap.max_recv_wr = lnk->lgr->max_recv_wr;
686 lnk->roce_qp = ib_create_qp(pd: lnk->roce_pd, init_attr: &qp_attr);
687 rc = PTR_ERR_OR_ZERO(ptr: lnk->roce_qp);
688 if (IS_ERR(ptr: lnk->roce_qp))
689 lnk->roce_qp = NULL;
690 else
691 smc_wr_remember_qp_attr(lnk);
692 return rc;
693}
694
695void smc_ib_put_memory_region(struct ib_mr *mr)
696{
697 ib_dereg_mr(mr);
698}
699
700static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx)
701{
702 unsigned int offset = 0;
703 int sg_num;
704
705 /* map the largest prefix of a dma mapped SG list */
706 sg_num = ib_map_mr_sg(mr: buf_slot->mr[link_idx],
707 sg: buf_slot->sgt[link_idx].sgl,
708 sg_nents: buf_slot->sgt[link_idx].orig_nents,
709 sg_offset: &offset, PAGE_SIZE);
710
711 return sg_num;
712}
713
714/* Allocate a memory region and map the dma mapped SG list of buf_slot */
715int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
716 struct smc_buf_desc *buf_slot, u8 link_idx)
717{
718 if (buf_slot->mr[link_idx])
719 return 0; /* already done */
720
721 buf_slot->mr[link_idx] =
722 ib_alloc_mr(pd, mr_type: IB_MR_TYPE_MEM_REG, max_num_sg: 1 << buf_slot->order);
723 if (IS_ERR(ptr: buf_slot->mr[link_idx])) {
724 int rc;
725
726 rc = PTR_ERR(ptr: buf_slot->mr[link_idx]);
727 buf_slot->mr[link_idx] = NULL;
728 return rc;
729 }
730
731 if (smc_ib_map_mr_sg(buf_slot, link_idx) !=
732 buf_slot->sgt[link_idx].orig_nents)
733 return -EINVAL;
734
735 return 0;
736}
737
738bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
739 struct smc_buf_desc *buf_slot)
740{
741 struct scatterlist *sg;
742 unsigned int i;
743 bool ret = false;
744
745 if (!lnk->smcibdev->ibdev->dma_device)
746 return ret;
747
748 /* for now there is just one DMA address */
749 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
750 buf_slot->sgt[lnk->link_idx].nents, i) {
751 if (!sg_dma_len(sg))
752 break;
753 if (dma_need_sync(dev: lnk->smcibdev->ibdev->dma_device,
754 sg_dma_address(sg))) {
755 ret = true;
756 goto out;
757 }
758 }
759
760out:
761 return ret;
762}
763
764/* synchronize buffer usage for cpu access */
765void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
766 struct smc_buf_desc *buf_slot,
767 enum dma_data_direction data_direction)
768{
769 struct scatterlist *sg;
770 unsigned int i;
771
772 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
773 return;
774
775 /* for now there is just one DMA address */
776 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
777 buf_slot->sgt[lnk->link_idx].nents, i) {
778 if (!sg_dma_len(sg))
779 break;
780 ib_dma_sync_single_for_cpu(dev: lnk->smcibdev->ibdev,
781 sg_dma_address(sg),
782 sg_dma_len(sg),
783 dir: data_direction);
784 }
785}
786
787/* synchronize buffer usage for device access */
788void smc_ib_sync_sg_for_device(struct smc_link *lnk,
789 struct smc_buf_desc *buf_slot,
790 enum dma_data_direction data_direction)
791{
792 struct scatterlist *sg;
793 unsigned int i;
794
795 if (!(buf_slot->is_dma_need_sync & (1U << lnk->link_idx)))
796 return;
797
798 /* for now there is just one DMA address */
799 for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg,
800 buf_slot->sgt[lnk->link_idx].nents, i) {
801 if (!sg_dma_len(sg))
802 break;
803 ib_dma_sync_single_for_device(dev: lnk->smcibdev->ibdev,
804 sg_dma_address(sg),
805 sg_dma_len(sg),
806 dir: data_direction);
807 }
808}
809
810/* Map a new TX or RX buffer SG-table to DMA */
811int smc_ib_buf_map_sg(struct smc_link *lnk,
812 struct smc_buf_desc *buf_slot,
813 enum dma_data_direction data_direction)
814{
815 int mapped_nents;
816
817 mapped_nents = ib_dma_map_sg(dev: lnk->smcibdev->ibdev,
818 sg: buf_slot->sgt[lnk->link_idx].sgl,
819 nents: buf_slot->sgt[lnk->link_idx].orig_nents,
820 direction: data_direction);
821 if (!mapped_nents)
822 return -ENOMEM;
823
824 return mapped_nents;
825}
826
827void smc_ib_buf_unmap_sg(struct smc_link *lnk,
828 struct smc_buf_desc *buf_slot,
829 enum dma_data_direction data_direction)
830{
831 if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address)
832 return; /* already unmapped */
833
834 ib_dma_unmap_sg(dev: lnk->smcibdev->ibdev,
835 sg: buf_slot->sgt[lnk->link_idx].sgl,
836 nents: buf_slot->sgt[lnk->link_idx].orig_nents,
837 direction: data_direction);
838 buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0;
839}
840
841long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev)
842{
843 struct ib_cq_init_attr cqattr = {
844 .cqe = SMC_MAX_CQE, .comp_vector = 0 };
845 int cqe_size_order, smc_order;
846 long rc;
847
848 mutex_lock(&smcibdev->mutex);
849 rc = 0;
850 if (smcibdev->initialized)
851 goto out;
852 /* the calculated number of cq entries fits to mlx5 cq allocation */
853 cqe_size_order = cache_line_size() == 128 ? 7 : 6;
854 smc_order = MAX_PAGE_ORDER - cqe_size_order;
855 if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE)
856 cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2;
857 smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev,
858 smc_wr_tx_cq_handler, NULL,
859 smcibdev, &cqattr);
860 rc = PTR_ERR_OR_ZERO(ptr: smcibdev->roce_cq_send);
861 if (IS_ERR(ptr: smcibdev->roce_cq_send)) {
862 smcibdev->roce_cq_send = NULL;
863 goto out;
864 }
865 smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev,
866 smc_wr_rx_cq_handler, NULL,
867 smcibdev, &cqattr);
868 rc = PTR_ERR_OR_ZERO(ptr: smcibdev->roce_cq_recv);
869 if (IS_ERR(ptr: smcibdev->roce_cq_recv)) {
870 smcibdev->roce_cq_recv = NULL;
871 goto err;
872 }
873 smc_wr_add_dev(smcibdev);
874 smcibdev->initialized = 1;
875 goto out;
876
877err:
878 ib_destroy_cq(cq: smcibdev->roce_cq_send);
879out:
880 mutex_unlock(lock: &smcibdev->mutex);
881 return rc;
882}
883
884static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev)
885{
886 mutex_lock(&smcibdev->mutex);
887 if (!smcibdev->initialized)
888 goto out;
889 smcibdev->initialized = 0;
890 ib_destroy_cq(cq: smcibdev->roce_cq_recv);
891 ib_destroy_cq(cq: smcibdev->roce_cq_send);
892 smc_wr_remove_dev(smcibdev);
893out:
894 mutex_unlock(lock: &smcibdev->mutex);
895}
896
897static struct ib_client smc_ib_client;
898
899static void smc_copy_netdev_ifindex(struct smc_ib_device *smcibdev, int port)
900{
901 struct ib_device *ibdev = smcibdev->ibdev;
902 struct net_device *ndev;
903
904 ndev = ib_device_get_netdev(ib_dev: ibdev, port: port + 1);
905 if (ndev) {
906 smcibdev->ndev_ifidx[port] = ndev->ifindex;
907 dev_put(dev: ndev);
908 }
909}
910
911void 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 lndev = ib_device_get_netdev(ib_dev: libdev, port: i + 1);
925 dev_put(dev: lndev);
926 if (lndev != ndev)
927 continue;
928 if (event == NETDEV_REGISTER)
929 smcibdev->ndev_ifidx[i] = ndev->ifindex;
930 if (event == NETDEV_UNREGISTER)
931 smcibdev->ndev_ifidx[i] = 0;
932 }
933 }
934 mutex_unlock(lock: &smc_ib_devices.mutex);
935}
936
937/* callback function for ib_register_client() */
938static int smc_ib_add_dev(struct ib_device *ibdev)
939{
940 struct smc_ib_device *smcibdev;
941 u8 port_cnt;
942 int i;
943
944 if (ibdev->node_type != RDMA_NODE_IB_CA)
945 return -EOPNOTSUPP;
946
947 smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL);
948 if (!smcibdev)
949 return -ENOMEM;
950
951 smcibdev->ibdev = ibdev;
952 INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work);
953 atomic_set(v: &smcibdev->lnk_cnt, i: 0);
954 init_waitqueue_head(&smcibdev->lnks_deleted);
955 mutex_init(&smcibdev->mutex);
956 mutex_lock(&smc_ib_devices.mutex);
957 list_add_tail(new: &smcibdev->list, head: &smc_ib_devices.list);
958 mutex_unlock(lock: &smc_ib_devices.mutex);
959 ib_set_client_data(device: ibdev, client: &smc_ib_client, data: smcibdev);
960 INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev,
961 smc_ib_global_event_handler);
962 ib_register_event_handler(event_handler: &smcibdev->event_handler);
963
964 /* trigger reading of the port attributes */
965 port_cnt = smcibdev->ibdev->phys_port_cnt;
966 pr_warn_ratelimited("smc: adding ib device %s with port count %d\n",
967 smcibdev->ibdev->name, port_cnt);
968 for (i = 0;
969 i < min_t(size_t, port_cnt, SMC_MAX_PORTS);
970 i++) {
971 set_bit(nr: i, addr: &smcibdev->port_event_mask);
972 /* determine pnetids of the port */
973 if (smc_pnetid_by_dev_port(dev: ibdev->dev.parent, port: i,
974 pnetid: smcibdev->pnetid[i]))
975 smc_pnetid_by_table_ib(smcibdev, ib_port: i + 1);
976 smc_copy_netdev_ifindex(smcibdev, port: i);
977 if (smc_pnet_is_pnetid_set(pnetid: smcibdev->pnetid[i]))
978 pr_warn_ratelimited("smc: ib device %s port %d has pnetid %.16s%s\n",
979 smcibdev->ibdev->name, i + 1,
980 smcibdev->pnetid[i],
981 smcibdev->pnetid_by_user[i] ?
982 " (user defined)" :
983 "");
984 else
985 pr_warn_ratelimited("smc: ib device %s port %d has no pnetid\n",
986 smcibdev->ibdev->name, i + 1);
987
988 }
989 schedule_work(work: &smcibdev->port_event_work);
990 return 0;
991}
992
993/* callback function for ib_unregister_client() */
994static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data)
995{
996 struct smc_ib_device *smcibdev = client_data;
997
998 mutex_lock(&smc_ib_devices.mutex);
999 list_del_init(entry: &smcibdev->list); /* remove from smc_ib_devices */
1000 mutex_unlock(lock: &smc_ib_devices.mutex);
1001 pr_warn_ratelimited("smc: removing ib device %s\n",
1002 smcibdev->ibdev->name);
1003 smc_smcr_terminate_all(smcibdev);
1004 smc_ib_cleanup_per_ibdev(smcibdev);
1005 ib_unregister_event_handler(event_handler: &smcibdev->event_handler);
1006 cancel_work_sync(work: &smcibdev->port_event_work);
1007 kfree(objp: smcibdev);
1008}
1009
1010static struct ib_client smc_ib_client = {
1011 .name = "smc_ib",
1012 .add = smc_ib_add_dev,
1013 .remove = smc_ib_remove_dev,
1014};
1015
1016int __init smc_ib_register_client(void)
1017{
1018 smc_ib_init_local_systemid();
1019 return ib_register_client(client: &smc_ib_client);
1020}
1021
1022void smc_ib_unregister_client(void)
1023{
1024 ib_unregister_client(client: &smc_ib_client);
1025}
1026

source code of linux/net/smc/smc_ib.c