Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a4cf0443 UB |
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> | |
bd4ad577 | 16 | #include <linux/workqueue.h> |
10428dd8 | 17 | #include <linux/scatterlist.h> |
6dabd405 | 18 | #include <linux/wait.h> |
a4cf0443 | 19 | #include <rdma/ib_verbs.h> |
ddb457c6 | 20 | #include <rdma/ib_cache.h> |
a4cf0443 | 21 | |
6812baab | 22 | #include "smc_pnet.h" |
a4cf0443 | 23 | #include "smc_ib.h" |
cd6851f3 | 24 | #include "smc_core.h" |
f38ba179 | 25 | #include "smc_wr.h" |
a4cf0443 UB |
26 | #include "smc.h" |
27 | ||
c9f4c6cf UB |
28 | #define SMC_MAX_CQE 32766 /* max. # of completion queue elements */ |
29 | ||
bd4ad577 UB |
30 | #define SMC_QP_MIN_RNR_TIMER 5 |
31 | #define SMC_QP_TIMEOUT 15 /* 4096 * 2 ** timeout usec */ | |
32 | #define SMC_QP_RETRY_CNT 7 /* 7: infinite */ | |
33 | #define SMC_QP_RNR_RETRY 7 /* 7: infinite */ | |
34 | ||
a4cf0443 UB |
35 | struct smc_ib_devices smc_ib_devices = { /* smc-registered ib devices */ |
36 | .lock = __SPIN_LOCK_UNLOCKED(smc_ib_devices.lock), | |
37 | .list = LIST_HEAD_INIT(smc_ib_devices.list), | |
38 | }; | |
39 | ||
366bb249 | 40 | u8 local_systemid[SMC_SYSTEMID_LEN]; /* unique system identifier */ |
a4cf0443 | 41 | |
bd4ad577 UB |
42 | static int smc_ib_modify_qp_init(struct smc_link *lnk) |
43 | { | |
44 | struct ib_qp_attr qp_attr; | |
45 | ||
46 | memset(&qp_attr, 0, sizeof(qp_attr)); | |
47 | qp_attr.qp_state = IB_QPS_INIT; | |
48 | qp_attr.pkey_index = 0; | |
49 | qp_attr.port_num = lnk->ibport; | |
50 | qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE | |
51 | | IB_ACCESS_REMOTE_WRITE; | |
52 | return ib_modify_qp(lnk->roce_qp, &qp_attr, | |
53 | IB_QP_STATE | IB_QP_PKEY_INDEX | | |
54 | IB_QP_ACCESS_FLAGS | IB_QP_PORT); | |
55 | } | |
56 | ||
57 | static int smc_ib_modify_qp_rtr(struct smc_link *lnk) | |
58 | { | |
59 | enum ib_qp_attr_mask qp_attr_mask = | |
60 | IB_QP_STATE | IB_QP_AV | IB_QP_PATH_MTU | IB_QP_DEST_QPN | | |
61 | IB_QP_RQ_PSN | IB_QP_MAX_DEST_RD_ATOMIC | IB_QP_MIN_RNR_TIMER; | |
62 | struct ib_qp_attr qp_attr; | |
63 | ||
64 | memset(&qp_attr, 0, sizeof(qp_attr)); | |
65 | qp_attr.qp_state = IB_QPS_RTR; | |
66 | qp_attr.path_mtu = min(lnk->path_mtu, lnk->peer_mtu); | |
44c58487 | 67 | qp_attr.ah_attr.type = RDMA_AH_ATTR_TYPE_ROCE; |
d8966fcd | 68 | rdma_ah_set_port_num(&qp_attr.ah_attr, lnk->ibport); |
7005ada6 | 69 | rdma_ah_set_grh(&qp_attr.ah_attr, NULL, 0, lnk->sgid_index, 1, 0); |
d8966fcd | 70 | rdma_ah_set_dgid_raw(&qp_attr.ah_attr, lnk->peer_gid); |
44c58487 | 71 | memcpy(&qp_attr.ah_attr.roce.dmac, lnk->peer_mac, |
bd4ad577 UB |
72 | sizeof(lnk->peer_mac)); |
73 | qp_attr.dest_qp_num = lnk->peer_qpn; | |
74 | qp_attr.rq_psn = lnk->peer_psn; /* starting receive packet seq # */ | |
75 | qp_attr.max_dest_rd_atomic = 1; /* max # of resources for incoming | |
76 | * requests | |
77 | */ | |
78 | qp_attr.min_rnr_timer = SMC_QP_MIN_RNR_TIMER; | |
79 | ||
80 | return ib_modify_qp(lnk->roce_qp, &qp_attr, qp_attr_mask); | |
81 | } | |
82 | ||
83 | int smc_ib_modify_qp_rts(struct smc_link *lnk) | |
84 | { | |
85 | struct ib_qp_attr qp_attr; | |
86 | ||
87 | memset(&qp_attr, 0, sizeof(qp_attr)); | |
88 | qp_attr.qp_state = IB_QPS_RTS; | |
89 | qp_attr.timeout = SMC_QP_TIMEOUT; /* local ack timeout */ | |
90 | qp_attr.retry_cnt = SMC_QP_RETRY_CNT; /* retry count */ | |
91 | qp_attr.rnr_retry = SMC_QP_RNR_RETRY; /* RNR retries, 7=infinite */ | |
92 | qp_attr.sq_psn = lnk->psn_initial; /* starting send packet seq # */ | |
93 | qp_attr.max_rd_atomic = 1; /* # of outstanding RDMA reads and | |
94 | * atomic ops allowed | |
95 | */ | |
96 | return ib_modify_qp(lnk->roce_qp, &qp_attr, | |
97 | IB_QP_STATE | IB_QP_TIMEOUT | IB_QP_RETRY_CNT | | |
98 | IB_QP_SQ_PSN | IB_QP_RNR_RETRY | | |
99 | IB_QP_MAX_QP_RD_ATOMIC); | |
100 | } | |
101 | ||
102 | int smc_ib_modify_qp_reset(struct smc_link *lnk) | |
103 | { | |
104 | struct ib_qp_attr qp_attr; | |
105 | ||
106 | memset(&qp_attr, 0, sizeof(qp_attr)); | |
107 | qp_attr.qp_state = IB_QPS_RESET; | |
108 | return ib_modify_qp(lnk->roce_qp, &qp_attr, IB_QP_STATE); | |
109 | } | |
110 | ||
111 | int smc_ib_ready_link(struct smc_link *lnk) | |
112 | { | |
00e5fb26 | 113 | struct smc_link_group *lgr = smc_get_lgr(lnk); |
bd4ad577 UB |
114 | int rc = 0; |
115 | ||
116 | rc = smc_ib_modify_qp_init(lnk); | |
117 | if (rc) | |
118 | goto out; | |
119 | ||
120 | rc = smc_ib_modify_qp_rtr(lnk); | |
121 | if (rc) | |
122 | goto out; | |
123 | smc_wr_remember_qp_attr(lnk); | |
124 | rc = ib_req_notify_cq(lnk->smcibdev->roce_cq_recv, | |
125 | IB_CQ_SOLICITED_MASK); | |
126 | if (rc) | |
127 | goto out; | |
128 | rc = smc_wr_rx_post_init(lnk); | |
129 | if (rc) | |
130 | goto out; | |
131 | smc_wr_remember_qp_attr(lnk); | |
132 | ||
133 | if (lgr->role == SMC_SERV) { | |
134 | rc = smc_ib_modify_qp_rts(lnk); | |
135 | if (rc) | |
136 | goto out; | |
137 | smc_wr_remember_qp_attr(lnk); | |
138 | } | |
139 | out: | |
140 | return rc; | |
141 | } | |
142 | ||
7005ada6 | 143 | static int smc_ib_fill_mac(struct smc_ib_device *smcibdev, u8 ibport) |
be6a3f38 | 144 | { |
b4c296f9 | 145 | const struct ib_gid_attr *attr; |
5102eca9 | 146 | int rc; |
be6a3f38 | 147 | |
b4c296f9 JG |
148 | attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, 0); |
149 | if (IS_ERR(attr)) | |
be6a3f38 UB |
150 | return -ENODEV; |
151 | ||
5102eca9 | 152 | rc = rdma_read_gid_l2_fields(attr, NULL, smcibdev->mac[ibport - 1]); |
b4c296f9 JG |
153 | rdma_put_gid_attr(attr); |
154 | return rc; | |
be6a3f38 UB |
155 | } |
156 | ||
157 | /* Create an identifier unique for this instance of SMC-R. | |
158 | * The MAC-address of the first active registered IB device | |
159 | * plus a random 2-byte number is used to create this identifier. | |
160 | * This name is delivered to the peer during connection initialization. | |
161 | */ | |
162 | static inline void smc_ib_define_local_systemid(struct smc_ib_device *smcibdev, | |
163 | u8 ibport) | |
164 | { | |
165 | memcpy(&local_systemid[2], &smcibdev->mac[ibport - 1], | |
166 | sizeof(smcibdev->mac[ibport - 1])); | |
366bb249 HW |
167 | } |
168 | ||
a082ec89 | 169 | bool smc_ib_is_valid_local_systemid(void) |
366bb249 HW |
170 | { |
171 | return !is_zero_ether_addr(&local_systemid[2]); | |
172 | } | |
173 | ||
174 | static void smc_ib_init_local_systemid(void) | |
175 | { | |
be6a3f38 UB |
176 | get_random_bytes(&local_systemid[0], 2); |
177 | } | |
178 | ||
179 | bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport) | |
180 | { | |
181 | return smcibdev->pattr[ibport - 1].state == IB_PORT_ACTIVE; | |
182 | } | |
183 | ||
7005ada6 UB |
184 | /* determine the gid for an ib-device port and vlan id */ |
185 | int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport, | |
186 | unsigned short vlan_id, u8 gid[], u8 *sgid_index) | |
187 | { | |
b4c296f9 | 188 | const struct ib_gid_attr *attr; |
5102eca9 | 189 | const struct net_device *ndev; |
7005ada6 UB |
190 | int i; |
191 | ||
192 | for (i = 0; i < smcibdev->pattr[ibport - 1].gid_tbl_len; i++) { | |
b4c296f9 JG |
193 | attr = rdma_get_gid_attr(smcibdev->ibdev, ibport, i); |
194 | if (IS_ERR(attr)) | |
7005ada6 | 195 | continue; |
b4c296f9 | 196 | |
5102eca9 PP |
197 | rcu_read_lock(); |
198 | ndev = rdma_read_gid_attr_ndev_rcu(attr); | |
199 | if (!IS_ERR(ndev) && | |
b4c296f9 JG |
200 | ((!vlan_id && !is_vlan_dev(attr->ndev)) || |
201 | (vlan_id && is_vlan_dev(attr->ndev) && | |
202 | vlan_dev_vlan_id(attr->ndev) == vlan_id)) && | |
203 | attr->gid_type == IB_GID_TYPE_ROCE) { | |
5102eca9 | 204 | rcu_read_unlock(); |
7005ada6 | 205 | if (gid) |
b4c296f9 | 206 | memcpy(gid, &attr->gid, SMC_GID_SIZE); |
7005ada6 | 207 | if (sgid_index) |
b4c296f9 JG |
208 | *sgid_index = attr->index; |
209 | rdma_put_gid_attr(attr); | |
7005ada6 UB |
210 | return 0; |
211 | } | |
5102eca9 | 212 | rcu_read_unlock(); |
b4c296f9 | 213 | rdma_put_gid_attr(attr); |
7005ada6 UB |
214 | } |
215 | return -ENODEV; | |
216 | } | |
217 | ||
be6a3f38 UB |
218 | static int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport) |
219 | { | |
220 | int rc; | |
221 | ||
222 | memset(&smcibdev->pattr[ibport - 1], 0, | |
223 | sizeof(smcibdev->pattr[ibport - 1])); | |
224 | rc = ib_query_port(smcibdev->ibdev, ibport, | |
225 | &smcibdev->pattr[ibport - 1]); | |
226 | if (rc) | |
227 | goto out; | |
228 | /* the SMC protocol requires specification of the RoCE MAC address */ | |
7005ada6 | 229 | rc = smc_ib_fill_mac(smcibdev, ibport); |
be6a3f38 UB |
230 | if (rc) |
231 | goto out; | |
366bb249 | 232 | if (!smc_ib_is_valid_local_systemid() && |
be6a3f38 UB |
233 | smc_ib_port_active(smcibdev, ibport)) |
234 | /* create unique system identifier */ | |
235 | smc_ib_define_local_systemid(smcibdev, ibport); | |
236 | out: | |
237 | return rc; | |
238 | } | |
239 | ||
bd4ad577 UB |
240 | /* process context wrapper for might_sleep smc_ib_remember_port_attr */ |
241 | static void smc_ib_port_event_work(struct work_struct *work) | |
242 | { | |
243 | struct smc_ib_device *smcibdev = container_of( | |
244 | work, struct smc_ib_device, port_event_work); | |
245 | u8 port_idx; | |
246 | ||
247 | for_each_set_bit(port_idx, &smcibdev->port_event_mask, SMC_MAX_PORTS) { | |
248 | smc_ib_remember_port_attr(smcibdev, port_idx + 1); | |
249 | clear_bit(port_idx, &smcibdev->port_event_mask); | |
c3d9494e UB |
250 | if (!smc_ib_port_active(smcibdev, port_idx + 1)) { |
251 | set_bit(port_idx, smcibdev->ports_going_away); | |
541afa10 | 252 | smcr_port_err(smcibdev, port_idx + 1); |
c3d9494e UB |
253 | } else { |
254 | clear_bit(port_idx, smcibdev->ports_going_away); | |
1f90a05d | 255 | smcr_port_add(smcibdev, port_idx + 1); |
c3d9494e | 256 | } |
bd4ad577 UB |
257 | } |
258 | } | |
259 | ||
260 | /* can be called in IRQ context */ | |
261 | static void smc_ib_global_event_handler(struct ib_event_handler *handler, | |
262 | struct ib_event *ibevent) | |
263 | { | |
264 | struct smc_ib_device *smcibdev; | |
5613f20c | 265 | bool schedule = false; |
bd4ad577 UB |
266 | u8 port_idx; |
267 | ||
268 | smcibdev = container_of(handler, struct smc_ib_device, event_handler); | |
bd4ad577 UB |
269 | |
270 | switch (ibevent->event) { | |
bd4ad577 | 271 | case IB_EVENT_DEVICE_FATAL: |
81cf6430 | 272 | /* terminate all ports on device */ |
c3d9494e | 273 | for (port_idx = 0; port_idx < SMC_MAX_PORTS; port_idx++) { |
81cf6430 | 274 | set_bit(port_idx, &smcibdev->port_event_mask); |
5613f20c UB |
275 | if (!test_and_set_bit(port_idx, |
276 | smcibdev->ports_going_away)) | |
277 | schedule = true; | |
c3d9494e | 278 | } |
5613f20c UB |
279 | if (schedule) |
280 | schedule_work(&smcibdev->port_event_work); | |
81cf6430 | 281 | break; |
bd4ad577 UB |
282 | case IB_EVENT_PORT_ACTIVE: |
283 | port_idx = ibevent->element.port_num - 1; | |
5613f20c UB |
284 | if (port_idx >= SMC_MAX_PORTS) |
285 | break; | |
286 | set_bit(port_idx, &smcibdev->port_event_mask); | |
287 | if (test_and_clear_bit(port_idx, smcibdev->ports_going_away)) | |
288 | schedule_work(&smcibdev->port_event_work); | |
289 | break; | |
290 | case IB_EVENT_PORT_ERR: | |
291 | port_idx = ibevent->element.port_num - 1; | |
292 | if (port_idx >= SMC_MAX_PORTS) | |
293 | break; | |
294 | set_bit(port_idx, &smcibdev->port_event_mask); | |
295 | if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) | |
81cf6430 | 296 | schedule_work(&smcibdev->port_event_work); |
5613f20c UB |
297 | break; |
298 | case IB_EVENT_GID_CHANGE: | |
299 | port_idx = ibevent->element.port_num - 1; | |
300 | if (port_idx >= SMC_MAX_PORTS) | |
301 | break; | |
302 | set_bit(port_idx, &smcibdev->port_event_mask); | |
303 | schedule_work(&smcibdev->port_event_work); | |
bd4ad577 UB |
304 | break; |
305 | default: | |
306 | break; | |
307 | } | |
308 | } | |
309 | ||
f38ba179 UB |
310 | void smc_ib_dealloc_protection_domain(struct smc_link *lnk) |
311 | { | |
da05bf29 UB |
312 | if (lnk->roce_pd) |
313 | ib_dealloc_pd(lnk->roce_pd); | |
f38ba179 UB |
314 | lnk->roce_pd = NULL; |
315 | } | |
316 | ||
317 | int smc_ib_create_protection_domain(struct smc_link *lnk) | |
318 | { | |
319 | int rc; | |
320 | ||
897e1c24 | 321 | lnk->roce_pd = ib_alloc_pd(lnk->smcibdev->ibdev, 0); |
f38ba179 UB |
322 | rc = PTR_ERR_OR_ZERO(lnk->roce_pd); |
323 | if (IS_ERR(lnk->roce_pd)) | |
324 | lnk->roce_pd = NULL; | |
325 | return rc; | |
326 | } | |
327 | ||
328 | static void smc_ib_qp_event_handler(struct ib_event *ibevent, void *priv) | |
329 | { | |
e5f3aa04 KG |
330 | struct smc_link *lnk = (struct smc_link *)priv; |
331 | struct smc_ib_device *smcibdev = lnk->smcibdev; | |
da05bf29 UB |
332 | u8 port_idx; |
333 | ||
f38ba179 | 334 | switch (ibevent->event) { |
81cf6430 | 335 | case IB_EVENT_QP_FATAL: |
f38ba179 | 336 | case IB_EVENT_QP_ACCESS_ERR: |
e5f3aa04 | 337 | port_idx = ibevent->element.qp->port - 1; |
5613f20c UB |
338 | if (port_idx >= SMC_MAX_PORTS) |
339 | break; | |
340 | set_bit(port_idx, &smcibdev->port_event_mask); | |
341 | if (!test_and_set_bit(port_idx, smcibdev->ports_going_away)) | |
81cf6430 | 342 | schedule_work(&smcibdev->port_event_work); |
f38ba179 UB |
343 | break; |
344 | default: | |
345 | break; | |
346 | } | |
347 | } | |
348 | ||
349 | void smc_ib_destroy_queue_pair(struct smc_link *lnk) | |
350 | { | |
da05bf29 UB |
351 | if (lnk->roce_qp) |
352 | ib_destroy_qp(lnk->roce_qp); | |
f38ba179 UB |
353 | lnk->roce_qp = NULL; |
354 | } | |
355 | ||
356 | /* create a queue pair within the protection domain for a link */ | |
357 | int smc_ib_create_queue_pair(struct smc_link *lnk) | |
358 | { | |
359 | struct ib_qp_init_attr qp_attr = { | |
360 | .event_handler = smc_ib_qp_event_handler, | |
361 | .qp_context = lnk, | |
362 | .send_cq = lnk->smcibdev->roce_cq_send, | |
363 | .recv_cq = lnk->smcibdev->roce_cq_recv, | |
364 | .srq = NULL, | |
365 | .cap = { | |
f38ba179 UB |
366 | /* include unsolicited rdma_writes as well, |
367 | * there are max. 2 RDMA_WRITE per 1 WR_SEND | |
368 | */ | |
652a1e41 | 369 | .max_send_wr = SMC_WR_BUF_CNT * 3, |
f38ba179 UB |
370 | .max_recv_wr = SMC_WR_BUF_CNT * 3, |
371 | .max_send_sge = SMC_IB_MAX_SEND_SGE, | |
372 | .max_recv_sge = 1, | |
f38ba179 UB |
373 | }, |
374 | .sq_sig_type = IB_SIGNAL_REQ_WR, | |
375 | .qp_type = IB_QPT_RC, | |
376 | }; | |
377 | int rc; | |
378 | ||
379 | lnk->roce_qp = ib_create_qp(lnk->roce_pd, &qp_attr); | |
380 | rc = PTR_ERR_OR_ZERO(lnk->roce_qp); | |
381 | if (IS_ERR(lnk->roce_qp)) | |
382 | lnk->roce_qp = NULL; | |
383 | else | |
384 | smc_wr_remember_qp_attr(lnk); | |
385 | return rc; | |
386 | } | |
387 | ||
897e1c24 UB |
388 | void smc_ib_put_memory_region(struct ib_mr *mr) |
389 | { | |
390 | ib_dereg_mr(mr); | |
391 | } | |
392 | ||
387707fd | 393 | static int smc_ib_map_mr_sg(struct smc_buf_desc *buf_slot, u8 link_idx) |
897e1c24 UB |
394 | { |
395 | unsigned int offset = 0; | |
396 | int sg_num; | |
397 | ||
398 | /* map the largest prefix of a dma mapped SG list */ | |
387707fd KG |
399 | sg_num = ib_map_mr_sg(buf_slot->mr_rx[link_idx], |
400 | buf_slot->sgt[link_idx].sgl, | |
401 | buf_slot->sgt[link_idx].orig_nents, | |
897e1c24 UB |
402 | &offset, PAGE_SIZE); |
403 | ||
404 | return sg_num; | |
405 | } | |
406 | ||
407 | /* Allocate a memory region and map the dma mapped SG list of buf_slot */ | |
408 | int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags, | |
387707fd | 409 | struct smc_buf_desc *buf_slot, u8 link_idx) |
897e1c24 | 410 | { |
387707fd | 411 | if (buf_slot->mr_rx[link_idx]) |
897e1c24 UB |
412 | return 0; /* already done */ |
413 | ||
387707fd | 414 | buf_slot->mr_rx[link_idx] = |
897e1c24 | 415 | ib_alloc_mr(pd, IB_MR_TYPE_MEM_REG, 1 << buf_slot->order); |
387707fd | 416 | if (IS_ERR(buf_slot->mr_rx[link_idx])) { |
897e1c24 UB |
417 | int rc; |
418 | ||
387707fd KG |
419 | rc = PTR_ERR(buf_slot->mr_rx[link_idx]); |
420 | buf_slot->mr_rx[link_idx] = NULL; | |
897e1c24 UB |
421 | return rc; |
422 | } | |
423 | ||
387707fd | 424 | if (smc_ib_map_mr_sg(buf_slot, link_idx) != 1) |
897e1c24 UB |
425 | return -EINVAL; |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
10428dd8 | 430 | /* synchronize buffer usage for cpu access */ |
387707fd | 431 | void smc_ib_sync_sg_for_cpu(struct smc_link *lnk, |
10428dd8 UB |
432 | struct smc_buf_desc *buf_slot, |
433 | enum dma_data_direction data_direction) | |
434 | { | |
435 | struct scatterlist *sg; | |
436 | unsigned int i; | |
437 | ||
438 | /* for now there is just one DMA address */ | |
387707fd KG |
439 | for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, |
440 | buf_slot->sgt[lnk->link_idx].nents, i) { | |
10428dd8 UB |
441 | if (!sg_dma_len(sg)) |
442 | break; | |
387707fd | 443 | ib_dma_sync_single_for_cpu(lnk->smcibdev->ibdev, |
10428dd8 UB |
444 | sg_dma_address(sg), |
445 | sg_dma_len(sg), | |
446 | data_direction); | |
447 | } | |
448 | } | |
449 | ||
450 | /* synchronize buffer usage for device access */ | |
387707fd | 451 | void smc_ib_sync_sg_for_device(struct smc_link *lnk, |
10428dd8 UB |
452 | struct smc_buf_desc *buf_slot, |
453 | enum dma_data_direction data_direction) | |
454 | { | |
455 | struct scatterlist *sg; | |
456 | unsigned int i; | |
457 | ||
458 | /* for now there is just one DMA address */ | |
387707fd KG |
459 | for_each_sg(buf_slot->sgt[lnk->link_idx].sgl, sg, |
460 | buf_slot->sgt[lnk->link_idx].nents, i) { | |
10428dd8 UB |
461 | if (!sg_dma_len(sg)) |
462 | break; | |
387707fd | 463 | ib_dma_sync_single_for_device(lnk->smcibdev->ibdev, |
10428dd8 UB |
464 | sg_dma_address(sg), |
465 | sg_dma_len(sg), | |
466 | data_direction); | |
467 | } | |
468 | } | |
469 | ||
a3fe3d01 | 470 | /* Map a new TX or RX buffer SG-table to DMA */ |
387707fd | 471 | int smc_ib_buf_map_sg(struct smc_link *lnk, |
a3fe3d01 UB |
472 | struct smc_buf_desc *buf_slot, |
473 | enum dma_data_direction data_direction) | |
474 | { | |
475 | int mapped_nents; | |
476 | ||
387707fd KG |
477 | mapped_nents = ib_dma_map_sg(lnk->smcibdev->ibdev, |
478 | buf_slot->sgt[lnk->link_idx].sgl, | |
479 | buf_slot->sgt[lnk->link_idx].orig_nents, | |
a3fe3d01 UB |
480 | data_direction); |
481 | if (!mapped_nents) | |
482 | return -ENOMEM; | |
483 | ||
484 | return mapped_nents; | |
485 | } | |
486 | ||
387707fd | 487 | void smc_ib_buf_unmap_sg(struct smc_link *lnk, |
a3fe3d01 UB |
488 | struct smc_buf_desc *buf_slot, |
489 | enum dma_data_direction data_direction) | |
490 | { | |
387707fd | 491 | if (!buf_slot->sgt[lnk->link_idx].sgl->dma_address) |
a3fe3d01 UB |
492 | return; /* already unmapped */ |
493 | ||
387707fd KG |
494 | ib_dma_unmap_sg(lnk->smcibdev->ibdev, |
495 | buf_slot->sgt[lnk->link_idx].sgl, | |
496 | buf_slot->sgt[lnk->link_idx].orig_nents, | |
a3fe3d01 | 497 | data_direction); |
387707fd | 498 | buf_slot->sgt[lnk->link_idx].sgl->dma_address = 0; |
a3fe3d01 UB |
499 | } |
500 | ||
bd4ad577 UB |
501 | long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev) |
502 | { | |
503 | struct ib_cq_init_attr cqattr = { | |
c9f4c6cf UB |
504 | .cqe = SMC_MAX_CQE, .comp_vector = 0 }; |
505 | int cqe_size_order, smc_order; | |
bd4ad577 UB |
506 | long rc; |
507 | ||
c9f4c6cf UB |
508 | /* the calculated number of cq entries fits to mlx5 cq allocation */ |
509 | cqe_size_order = cache_line_size() == 128 ? 7 : 6; | |
510 | smc_order = MAX_ORDER - cqe_size_order - 1; | |
511 | if (SMC_MAX_CQE + 2 > (0x00000001 << smc_order) * PAGE_SIZE) | |
512 | cqattr.cqe = (0x00000001 << smc_order) * PAGE_SIZE - 2; | |
bd4ad577 UB |
513 | smcibdev->roce_cq_send = ib_create_cq(smcibdev->ibdev, |
514 | smc_wr_tx_cq_handler, NULL, | |
515 | smcibdev, &cqattr); | |
516 | rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_send); | |
517 | if (IS_ERR(smcibdev->roce_cq_send)) { | |
518 | smcibdev->roce_cq_send = NULL; | |
519 | return rc; | |
520 | } | |
521 | smcibdev->roce_cq_recv = ib_create_cq(smcibdev->ibdev, | |
522 | smc_wr_rx_cq_handler, NULL, | |
523 | smcibdev, &cqattr); | |
524 | rc = PTR_ERR_OR_ZERO(smcibdev->roce_cq_recv); | |
525 | if (IS_ERR(smcibdev->roce_cq_recv)) { | |
526 | smcibdev->roce_cq_recv = NULL; | |
527 | goto err; | |
528 | } | |
bd4ad577 UB |
529 | smc_wr_add_dev(smcibdev); |
530 | smcibdev->initialized = 1; | |
531 | return rc; | |
532 | ||
533 | err: | |
534 | ib_destroy_cq(smcibdev->roce_cq_send); | |
535 | return rc; | |
536 | } | |
537 | ||
538 | static void smc_ib_cleanup_per_ibdev(struct smc_ib_device *smcibdev) | |
539 | { | |
540 | if (!smcibdev->initialized) | |
541 | return; | |
da05bf29 | 542 | smcibdev->initialized = 0; |
bd4ad577 UB |
543 | ib_destroy_cq(smcibdev->roce_cq_recv); |
544 | ib_destroy_cq(smcibdev->roce_cq_send); | |
6a37ad3d | 545 | smc_wr_remove_dev(smcibdev); |
bd4ad577 UB |
546 | } |
547 | ||
a4cf0443 UB |
548 | static struct ib_client smc_ib_client; |
549 | ||
550 | /* callback function for ib_register_client() */ | |
11a0ae4c | 551 | static int smc_ib_add_dev(struct ib_device *ibdev) |
a4cf0443 UB |
552 | { |
553 | struct smc_ib_device *smcibdev; | |
be6a3f38 UB |
554 | u8 port_cnt; |
555 | int i; | |
a4cf0443 UB |
556 | |
557 | if (ibdev->node_type != RDMA_NODE_IB_CA) | |
11a0ae4c | 558 | return -EOPNOTSUPP; |
a4cf0443 UB |
559 | |
560 | smcibdev = kzalloc(sizeof(*smcibdev), GFP_KERNEL); | |
561 | if (!smcibdev) | |
11a0ae4c | 562 | return -ENOMEM; |
a4cf0443 UB |
563 | |
564 | smcibdev->ibdev = ibdev; | |
bd4ad577 | 565 | INIT_WORK(&smcibdev->port_event_work, smc_ib_port_event_work); |
6dabd405 UB |
566 | atomic_set(&smcibdev->lnk_cnt, 0); |
567 | init_waitqueue_head(&smcibdev->lnks_deleted); | |
a4cf0443 UB |
568 | spin_lock(&smc_ib_devices.lock); |
569 | list_add_tail(&smcibdev->list, &smc_ib_devices.list); | |
570 | spin_unlock(&smc_ib_devices.lock); | |
571 | ib_set_client_data(ibdev, &smc_ib_client, smcibdev); | |
be6a3f38 UB |
572 | INIT_IB_EVENT_HANDLER(&smcibdev->event_handler, smcibdev->ibdev, |
573 | smc_ib_global_event_handler); | |
574 | ib_register_event_handler(&smcibdev->event_handler); | |
575 | ||
576 | /* trigger reading of the port attributes */ | |
577 | port_cnt = smcibdev->ibdev->phys_port_cnt; | |
0a99be43 KG |
578 | pr_warn_ratelimited("smc: adding ib device %s with port count %d\n", |
579 | smcibdev->ibdev->name, port_cnt); | |
be6a3f38 UB |
580 | for (i = 0; |
581 | i < min_t(size_t, port_cnt, SMC_MAX_PORTS); | |
0afff91c | 582 | i++) { |
be6a3f38 | 583 | set_bit(i, &smcibdev->port_event_mask); |
0afff91c | 584 | /* determine pnetids of the port */ |
fdff704d KG |
585 | if (smc_pnetid_by_dev_port(ibdev->dev.parent, i, |
586 | smcibdev->pnetid[i])) | |
587 | smc_pnetid_by_table_ib(smcibdev, i + 1); | |
0a99be43 KG |
588 | pr_warn_ratelimited("smc: ib device %s port %d has pnetid " |
589 | "%.16s%s\n", | |
590 | smcibdev->ibdev->name, i + 1, | |
591 | smcibdev->pnetid[i], | |
592 | smcibdev->pnetid_by_user[i] ? | |
593 | " (user defined)" : | |
594 | ""); | |
0afff91c | 595 | } |
be6a3f38 | 596 | schedule_work(&smcibdev->port_event_work); |
11a0ae4c | 597 | return 0; |
a4cf0443 UB |
598 | } |
599 | ||
0b29ec64 | 600 | /* callback function for ib_unregister_client() */ |
a4cf0443 UB |
601 | static void smc_ib_remove_dev(struct ib_device *ibdev, void *client_data) |
602 | { | |
1587982e | 603 | struct smc_ib_device *smcibdev = client_data; |
a4cf0443 | 604 | |
a4cf0443 UB |
605 | spin_lock(&smc_ib_devices.lock); |
606 | list_del_init(&smcibdev->list); /* remove from smc_ib_devices */ | |
607 | spin_unlock(&smc_ib_devices.lock); | |
0a99be43 KG |
608 | pr_warn_ratelimited("smc: removing ib device %s\n", |
609 | smcibdev->ibdev->name); | |
0b29ec64 | 610 | smc_smcr_terminate_all(smcibdev); |
bd4ad577 | 611 | smc_ib_cleanup_per_ibdev(smcibdev); |
be6a3f38 | 612 | ib_unregister_event_handler(&smcibdev->event_handler); |
ece0d7bd | 613 | cancel_work_sync(&smcibdev->port_event_work); |
a4cf0443 UB |
614 | kfree(smcibdev); |
615 | } | |
616 | ||
617 | static struct ib_client smc_ib_client = { | |
618 | .name = "smc_ib", | |
619 | .add = smc_ib_add_dev, | |
620 | .remove = smc_ib_remove_dev, | |
621 | }; | |
622 | ||
623 | int __init smc_ib_register_client(void) | |
624 | { | |
366bb249 | 625 | smc_ib_init_local_systemid(); |
a4cf0443 UB |
626 | return ib_register_client(&smc_ib_client); |
627 | } | |
628 | ||
629 | void smc_ib_unregister_client(void) | |
630 | { | |
631 | ib_unregister_client(&smc_ib_client); | |
632 | } |