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1/*
2 * Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33#include <linux/kref.h>
34#include <rdma/ib_umem.h>
35#include <rdma/ib_user_verbs.h>
36#include <rdma/ib_cache.h>
37#include "mlx5_ib.h"
38#include "srq.h"
39#include "qp.h"
40
41#define UVERBS_MODULE_NAME mlx5_ib
42#include <rdma/uverbs_named_ioctl.h>
43
44static void mlx5_ib_cq_comp(struct mlx5_core_cq *cq, struct mlx5_eqe *eqe)
45{
46 struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
47
48 ibcq->comp_handler(ibcq, ibcq->cq_context);
49}
50
51static void mlx5_ib_cq_event(struct mlx5_core_cq *mcq, enum mlx5_event type)
52{
53 struct mlx5_ib_cq *cq = container_of(mcq, struct mlx5_ib_cq, mcq);
54 struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
55 struct ib_cq *ibcq = &cq->ibcq;
56 struct ib_event event;
57
58 if (type != MLX5_EVENT_TYPE_CQ_ERROR) {
59 mlx5_ib_warn(dev, "Unexpected event type %d on CQ %06x\n",
60 type, mcq->cqn);
61 return;
62 }
63
64 if (ibcq->event_handler) {
65 event.device = &dev->ib_dev;
66 event.event = IB_EVENT_CQ_ERR;
67 event.element.cq = ibcq;
68 ibcq->event_handler(&event, ibcq->cq_context);
69 }
70}
71
72static void *get_cqe(struct mlx5_ib_cq *cq, int n)
73{
74 return mlx5_frag_buf_get_wqe(&cq->buf.fbc, n);
75}
76
77static u8 sw_ownership_bit(int n, int nent)
78{
79 return (n & nent) ? 1 : 0;
80}
81
82static void *get_sw_cqe(struct mlx5_ib_cq *cq, int n)
83{
84 void *cqe = get_cqe(cq, n & cq->ibcq.cqe);
85 struct mlx5_cqe64 *cqe64;
86
87 cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
88
89 if (likely(get_cqe_opcode(cqe64) != MLX5_CQE_INVALID) &&
90 !((cqe64->op_own & MLX5_CQE_OWNER_MASK) ^ !!(n & (cq->ibcq.cqe + 1)))) {
91 return cqe;
92 } else {
93 return NULL;
94 }
95}
96
97static void *next_cqe_sw(struct mlx5_ib_cq *cq)
98{
99 return get_sw_cqe(cq, cq->mcq.cons_index);
100}
101
102static enum ib_wc_opcode get_umr_comp(struct mlx5_ib_wq *wq, int idx)
103{
104 switch (wq->wr_data[idx]) {
105 case MLX5_IB_WR_UMR:
106 return 0;
107
108 case IB_WR_LOCAL_INV:
109 return IB_WC_LOCAL_INV;
110
111 case IB_WR_REG_MR:
112 return IB_WC_REG_MR;
113
114 default:
115 pr_warn("unknown completion status\n");
116 return 0;
117 }
118}
119
120static void handle_good_req(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
121 struct mlx5_ib_wq *wq, int idx)
122{
123 wc->wc_flags = 0;
124 switch (be32_to_cpu(cqe->sop_drop_qpn) >> 24) {
125 case MLX5_OPCODE_RDMA_WRITE_IMM:
126 wc->wc_flags |= IB_WC_WITH_IMM;
127 fallthrough;
128 case MLX5_OPCODE_RDMA_WRITE:
129 wc->opcode = IB_WC_RDMA_WRITE;
130 break;
131 case MLX5_OPCODE_SEND_IMM:
132 wc->wc_flags |= IB_WC_WITH_IMM;
133 fallthrough;
134 case MLX5_OPCODE_SEND:
135 case MLX5_OPCODE_SEND_INVAL:
136 wc->opcode = IB_WC_SEND;
137 break;
138 case MLX5_OPCODE_RDMA_READ:
139 wc->opcode = IB_WC_RDMA_READ;
140 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
141 break;
142 case MLX5_OPCODE_ATOMIC_CS:
143 wc->opcode = IB_WC_COMP_SWAP;
144 wc->byte_len = 8;
145 break;
146 case MLX5_OPCODE_ATOMIC_FA:
147 wc->opcode = IB_WC_FETCH_ADD;
148 wc->byte_len = 8;
149 break;
150 case MLX5_OPCODE_ATOMIC_MASKED_CS:
151 wc->opcode = IB_WC_MASKED_COMP_SWAP;
152 wc->byte_len = 8;
153 break;
154 case MLX5_OPCODE_ATOMIC_MASKED_FA:
155 wc->opcode = IB_WC_MASKED_FETCH_ADD;
156 wc->byte_len = 8;
157 break;
158 case MLX5_OPCODE_UMR:
159 wc->opcode = get_umr_comp(wq, idx);
160 break;
161 }
162}
163
164enum {
165 MLX5_GRH_IN_BUFFER = 1,
166 MLX5_GRH_IN_CQE = 2,
167};
168
169static void handle_responder(struct ib_wc *wc, struct mlx5_cqe64 *cqe,
170 struct mlx5_ib_qp *qp)
171{
172 enum rdma_link_layer ll = rdma_port_get_link_layer(qp->ibqp.device, 1);
173 struct mlx5_ib_dev *dev = to_mdev(qp->ibqp.device);
174 struct mlx5_ib_srq *srq = NULL;
175 struct mlx5_ib_wq *wq;
176 u16 wqe_ctr;
177 u8 roce_packet_type;
178 bool vlan_present;
179 u8 g;
180
181 if (qp->ibqp.srq || qp->ibqp.xrcd) {
182 struct mlx5_core_srq *msrq = NULL;
183
184 if (qp->ibqp.xrcd) {
185 msrq = mlx5_cmd_get_srq(dev, be32_to_cpu(cqe->srqn));
186 if (msrq)
187 srq = to_mibsrq(msrq);
188 } else {
189 srq = to_msrq(qp->ibqp.srq);
190 }
191 if (srq) {
192 wqe_ctr = be16_to_cpu(cqe->wqe_counter);
193 wc->wr_id = srq->wrid[wqe_ctr];
194 mlx5_ib_free_srq_wqe(srq, wqe_ctr);
195 if (msrq)
196 mlx5_core_res_put(&msrq->common);
197 }
198 } else {
199 wq = &qp->rq;
200 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
201 ++wq->tail;
202 }
203 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
204
205 switch (get_cqe_opcode(cqe)) {
206 case MLX5_CQE_RESP_WR_IMM:
207 wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
208 wc->wc_flags = IB_WC_WITH_IMM;
209 wc->ex.imm_data = cqe->immediate;
210 break;
211 case MLX5_CQE_RESP_SEND:
212 wc->opcode = IB_WC_RECV;
213 wc->wc_flags = IB_WC_IP_CSUM_OK;
214 if (unlikely(!((cqe->hds_ip_ext & CQE_L3_OK) &&
215 (cqe->hds_ip_ext & CQE_L4_OK))))
216 wc->wc_flags = 0;
217 break;
218 case MLX5_CQE_RESP_SEND_IMM:
219 wc->opcode = IB_WC_RECV;
220 wc->wc_flags = IB_WC_WITH_IMM;
221 wc->ex.imm_data = cqe->immediate;
222 break;
223 case MLX5_CQE_RESP_SEND_INV:
224 wc->opcode = IB_WC_RECV;
225 wc->wc_flags = IB_WC_WITH_INVALIDATE;
226 wc->ex.invalidate_rkey = be32_to_cpu(cqe->inval_rkey);
227 break;
228 }
229 wc->src_qp = be32_to_cpu(cqe->flags_rqpn) & 0xffffff;
230 wc->dlid_path_bits = cqe->ml_path;
231 g = (be32_to_cpu(cqe->flags_rqpn) >> 28) & 3;
232 wc->wc_flags |= g ? IB_WC_GRH : 0;
233 if (is_qp1(qp->type)) {
234 u16 pkey = be32_to_cpu(cqe->pkey) & 0xffff;
235
236 ib_find_cached_pkey(&dev->ib_dev, qp->port, pkey,
237 &wc->pkey_index);
238 } else {
239 wc->pkey_index = 0;
240 }
241
242 if (ll != IB_LINK_LAYER_ETHERNET) {
243 wc->slid = be16_to_cpu(cqe->slid);
244 wc->sl = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0xf;
245 return;
246 }
247
248 wc->slid = 0;
249 vlan_present = cqe->l4_l3_hdr_type & 0x1;
250 roce_packet_type = (be32_to_cpu(cqe->flags_rqpn) >> 24) & 0x3;
251 if (vlan_present) {
252 wc->vlan_id = (be16_to_cpu(cqe->vlan_info)) & 0xfff;
253 wc->sl = (be16_to_cpu(cqe->vlan_info) >> 13) & 0x7;
254 wc->wc_flags |= IB_WC_WITH_VLAN;
255 } else {
256 wc->sl = 0;
257 }
258
259 switch (roce_packet_type) {
260 case MLX5_CQE_ROCE_L3_HEADER_TYPE_GRH:
261 wc->network_hdr_type = RDMA_NETWORK_ROCE_V1;
262 break;
263 case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV6:
264 wc->network_hdr_type = RDMA_NETWORK_IPV6;
265 break;
266 case MLX5_CQE_ROCE_L3_HEADER_TYPE_IPV4:
267 wc->network_hdr_type = RDMA_NETWORK_IPV4;
268 break;
269 }
270 wc->wc_flags |= IB_WC_WITH_NETWORK_HDR_TYPE;
271}
272
273static void dump_cqe(struct mlx5_ib_dev *dev, struct mlx5_err_cqe *cqe,
274 struct ib_wc *wc, const char *level)
275{
276 mlx5_ib_log(level, dev, "WC error: %d, Message: %s\n", wc->status,
277 ib_wc_status_msg(wc->status));
278 print_hex_dump(level, "cqe_dump: ", DUMP_PREFIX_OFFSET, 16, 1,
279 cqe, sizeof(*cqe), false);
280}
281
282static void mlx5_handle_error_cqe(struct mlx5_ib_dev *dev,
283 struct mlx5_err_cqe *cqe,
284 struct ib_wc *wc)
285{
286 const char *dump = KERN_WARNING;
287
288 switch (cqe->syndrome) {
289 case MLX5_CQE_SYNDROME_LOCAL_LENGTH_ERR:
290 wc->status = IB_WC_LOC_LEN_ERR;
291 break;
292 case MLX5_CQE_SYNDROME_LOCAL_QP_OP_ERR:
293 wc->status = IB_WC_LOC_QP_OP_ERR;
294 break;
295 case MLX5_CQE_SYNDROME_LOCAL_PROT_ERR:
296 dump = KERN_DEBUG;
297 wc->status = IB_WC_LOC_PROT_ERR;
298 break;
299 case MLX5_CQE_SYNDROME_WR_FLUSH_ERR:
300 dump = NULL;
301 wc->status = IB_WC_WR_FLUSH_ERR;
302 break;
303 case MLX5_CQE_SYNDROME_MW_BIND_ERR:
304 wc->status = IB_WC_MW_BIND_ERR;
305 break;
306 case MLX5_CQE_SYNDROME_BAD_RESP_ERR:
307 wc->status = IB_WC_BAD_RESP_ERR;
308 break;
309 case MLX5_CQE_SYNDROME_LOCAL_ACCESS_ERR:
310 wc->status = IB_WC_LOC_ACCESS_ERR;
311 break;
312 case MLX5_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
313 wc->status = IB_WC_REM_INV_REQ_ERR;
314 break;
315 case MLX5_CQE_SYNDROME_REMOTE_ACCESS_ERR:
316 dump = KERN_DEBUG;
317 wc->status = IB_WC_REM_ACCESS_ERR;
318 break;
319 case MLX5_CQE_SYNDROME_REMOTE_OP_ERR:
320 dump = KERN_DEBUG;
321 wc->status = IB_WC_REM_OP_ERR;
322 break;
323 case MLX5_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
324 dump = NULL;
325 wc->status = IB_WC_RETRY_EXC_ERR;
326 break;
327 case MLX5_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
328 dump = NULL;
329 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
330 break;
331 case MLX5_CQE_SYNDROME_REMOTE_ABORTED_ERR:
332 wc->status = IB_WC_REM_ABORT_ERR;
333 break;
334 default:
335 wc->status = IB_WC_GENERAL_ERR;
336 break;
337 }
338
339 wc->vendor_err = cqe->vendor_err_synd;
340 if (dump)
341 dump_cqe(dev, cqe, wc, dump);
342}
343
344static void handle_atomics(struct mlx5_ib_qp *qp, struct mlx5_cqe64 *cqe64,
345 u16 tail, u16 head)
346{
347 u16 idx;
348
349 do {
350 idx = tail & (qp->sq.wqe_cnt - 1);
351 if (idx == head)
352 break;
353
354 tail = qp->sq.w_list[idx].next;
355 } while (1);
356 tail = qp->sq.w_list[idx].next;
357 qp->sq.last_poll = tail;
358}
359
360static void free_cq_buf(struct mlx5_ib_dev *dev, struct mlx5_ib_cq_buf *buf)
361{
362 mlx5_frag_buf_free(dev->mdev, &buf->frag_buf);
363}
364
365static void get_sig_err_item(struct mlx5_sig_err_cqe *cqe,
366 struct ib_sig_err *item)
367{
368 u16 syndrome = be16_to_cpu(cqe->syndrome);
369
370#define GUARD_ERR (1 << 13)
371#define APPTAG_ERR (1 << 12)
372#define REFTAG_ERR (1 << 11)
373
374 if (syndrome & GUARD_ERR) {
375 item->err_type = IB_SIG_BAD_GUARD;
376 item->expected = be32_to_cpu(cqe->expected_trans_sig) >> 16;
377 item->actual = be32_to_cpu(cqe->actual_trans_sig) >> 16;
378 } else
379 if (syndrome & REFTAG_ERR) {
380 item->err_type = IB_SIG_BAD_REFTAG;
381 item->expected = be32_to_cpu(cqe->expected_reftag);
382 item->actual = be32_to_cpu(cqe->actual_reftag);
383 } else
384 if (syndrome & APPTAG_ERR) {
385 item->err_type = IB_SIG_BAD_APPTAG;
386 item->expected = be32_to_cpu(cqe->expected_trans_sig) & 0xffff;
387 item->actual = be32_to_cpu(cqe->actual_trans_sig) & 0xffff;
388 } else {
389 pr_err("Got signature completion error with bad syndrome %04x\n",
390 syndrome);
391 }
392
393 item->sig_err_offset = be64_to_cpu(cqe->err_offset);
394 item->key = be32_to_cpu(cqe->mkey);
395}
396
397static void sw_comp(struct mlx5_ib_qp *qp, int num_entries, struct ib_wc *wc,
398 int *npolled, bool is_send)
399{
400 struct mlx5_ib_wq *wq;
401 unsigned int cur;
402 int np;
403 int i;
404
405 wq = (is_send) ? &qp->sq : &qp->rq;
406 cur = wq->head - wq->tail;
407 np = *npolled;
408
409 if (cur == 0)
410 return;
411
412 for (i = 0; i < cur && np < num_entries; i++) {
413 unsigned int idx;
414
415 idx = (is_send) ? wq->last_poll : wq->tail;
416 idx &= (wq->wqe_cnt - 1);
417 wc->wr_id = wq->wrid[idx];
418 wc->status = IB_WC_WR_FLUSH_ERR;
419 wc->vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
420 wq->tail++;
421 if (is_send)
422 wq->last_poll = wq->w_list[idx].next;
423 np++;
424 wc->qp = &qp->ibqp;
425 wc++;
426 }
427 *npolled = np;
428}
429
430static void mlx5_ib_poll_sw_comp(struct mlx5_ib_cq *cq, int num_entries,
431 struct ib_wc *wc, int *npolled)
432{
433 struct mlx5_ib_qp *qp;
434
435 *npolled = 0;
436 /* Find uncompleted WQEs belonging to that cq and return mmics ones */
437 list_for_each_entry(qp, &cq->list_send_qp, cq_send_list) {
438 sw_comp(qp, num_entries, wc + *npolled, npolled, true);
439 if (*npolled >= num_entries)
440 return;
441 }
442
443 list_for_each_entry(qp, &cq->list_recv_qp, cq_recv_list) {
444 sw_comp(qp, num_entries, wc + *npolled, npolled, false);
445 if (*npolled >= num_entries)
446 return;
447 }
448}
449
450static int mlx5_poll_one(struct mlx5_ib_cq *cq,
451 struct mlx5_ib_qp **cur_qp,
452 struct ib_wc *wc)
453{
454 struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
455 struct mlx5_err_cqe *err_cqe;
456 struct mlx5_cqe64 *cqe64;
457 struct mlx5_core_qp *mqp;
458 struct mlx5_ib_wq *wq;
459 uint8_t opcode;
460 uint32_t qpn;
461 u16 wqe_ctr;
462 void *cqe;
463 int idx;
464
465repoll:
466 cqe = next_cqe_sw(cq);
467 if (!cqe)
468 return -EAGAIN;
469
470 cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
471
472 ++cq->mcq.cons_index;
473
474 /* Make sure we read CQ entry contents after we've checked the
475 * ownership bit.
476 */
477 rmb();
478
479 opcode = get_cqe_opcode(cqe64);
480 if (unlikely(opcode == MLX5_CQE_RESIZE_CQ)) {
481 if (likely(cq->resize_buf)) {
482 free_cq_buf(dev, &cq->buf);
483 cq->buf = *cq->resize_buf;
484 kfree(cq->resize_buf);
485 cq->resize_buf = NULL;
486 goto repoll;
487 } else {
488 mlx5_ib_warn(dev, "unexpected resize cqe\n");
489 }
490 }
491
492 qpn = ntohl(cqe64->sop_drop_qpn) & 0xffffff;
493 if (!*cur_qp || (qpn != (*cur_qp)->ibqp.qp_num)) {
494 /* We do not have to take the QP table lock here,
495 * because CQs will be locked while QPs are removed
496 * from the table.
497 */
498 mqp = radix_tree_lookup(&dev->qp_table.tree, qpn);
499 *cur_qp = to_mibqp(mqp);
500 }
501
502 wc->qp = &(*cur_qp)->ibqp;
503 switch (opcode) {
504 case MLX5_CQE_REQ:
505 wq = &(*cur_qp)->sq;
506 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
507 idx = wqe_ctr & (wq->wqe_cnt - 1);
508 handle_good_req(wc, cqe64, wq, idx);
509 handle_atomics(*cur_qp, cqe64, wq->last_poll, idx);
510 wc->wr_id = wq->wrid[idx];
511 wq->tail = wq->wqe_head[idx] + 1;
512 wc->status = IB_WC_SUCCESS;
513 break;
514 case MLX5_CQE_RESP_WR_IMM:
515 case MLX5_CQE_RESP_SEND:
516 case MLX5_CQE_RESP_SEND_IMM:
517 case MLX5_CQE_RESP_SEND_INV:
518 handle_responder(wc, cqe64, *cur_qp);
519 wc->status = IB_WC_SUCCESS;
520 break;
521 case MLX5_CQE_RESIZE_CQ:
522 break;
523 case MLX5_CQE_REQ_ERR:
524 case MLX5_CQE_RESP_ERR:
525 err_cqe = (struct mlx5_err_cqe *)cqe64;
526 mlx5_handle_error_cqe(dev, err_cqe, wc);
527 mlx5_ib_dbg(dev, "%s error cqe on cqn 0x%x:\n",
528 opcode == MLX5_CQE_REQ_ERR ?
529 "Requestor" : "Responder", cq->mcq.cqn);
530 mlx5_ib_dbg(dev, "syndrome 0x%x, vendor syndrome 0x%x\n",
531 err_cqe->syndrome, err_cqe->vendor_err_synd);
532 if (wc->status != IB_WC_WR_FLUSH_ERR &&
533 (*cur_qp)->type == MLX5_IB_QPT_REG_UMR)
534 dev->umrc.state = MLX5_UMR_STATE_RECOVER;
535
536 if (opcode == MLX5_CQE_REQ_ERR) {
537 wq = &(*cur_qp)->sq;
538 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
539 idx = wqe_ctr & (wq->wqe_cnt - 1);
540 wc->wr_id = wq->wrid[idx];
541 wq->tail = wq->wqe_head[idx] + 1;
542 } else {
543 struct mlx5_ib_srq *srq;
544
545 if ((*cur_qp)->ibqp.srq) {
546 srq = to_msrq((*cur_qp)->ibqp.srq);
547 wqe_ctr = be16_to_cpu(cqe64->wqe_counter);
548 wc->wr_id = srq->wrid[wqe_ctr];
549 mlx5_ib_free_srq_wqe(srq, wqe_ctr);
550 } else {
551 wq = &(*cur_qp)->rq;
552 wc->wr_id = wq->wrid[wq->tail & (wq->wqe_cnt - 1)];
553 ++wq->tail;
554 }
555 }
556 break;
557 case MLX5_CQE_SIG_ERR: {
558 struct mlx5_sig_err_cqe *sig_err_cqe =
559 (struct mlx5_sig_err_cqe *)cqe64;
560 struct mlx5_core_sig_ctx *sig;
561
562 xa_lock(&dev->sig_mrs);
563 sig = xa_load(&dev->sig_mrs,
564 mlx5_base_mkey(be32_to_cpu(sig_err_cqe->mkey)));
565 get_sig_err_item(sig_err_cqe, &sig->err_item);
566 sig->sig_err_exists = true;
567 sig->sigerr_count++;
568
569 mlx5_ib_warn(dev, "CQN: 0x%x Got SIGERR on key: 0x%x err_type %x err_offset %llx expected %x actual %x\n",
570 cq->mcq.cqn, sig->err_item.key,
571 sig->err_item.err_type,
572 sig->err_item.sig_err_offset,
573 sig->err_item.expected,
574 sig->err_item.actual);
575
576 xa_unlock(&dev->sig_mrs);
577 goto repoll;
578 }
579 }
580
581 return 0;
582}
583
584static int poll_soft_wc(struct mlx5_ib_cq *cq, int num_entries,
585 struct ib_wc *wc, bool is_fatal_err)
586{
587 struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
588 struct mlx5_ib_wc *soft_wc, *next;
589 int npolled = 0;
590
591 list_for_each_entry_safe(soft_wc, next, &cq->wc_list, list) {
592 if (npolled >= num_entries)
593 break;
594
595 mlx5_ib_dbg(dev, "polled software generated completion on CQ 0x%x\n",
596 cq->mcq.cqn);
597
598 if (unlikely(is_fatal_err)) {
599 soft_wc->wc.status = IB_WC_WR_FLUSH_ERR;
600 soft_wc->wc.vendor_err = MLX5_CQE_SYNDROME_WR_FLUSH_ERR;
601 }
602 wc[npolled++] = soft_wc->wc;
603 list_del(&soft_wc->list);
604 kfree(soft_wc);
605 }
606
607 return npolled;
608}
609
610int mlx5_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
611{
612 struct mlx5_ib_cq *cq = to_mcq(ibcq);
613 struct mlx5_ib_qp *cur_qp = NULL;
614 struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
615 struct mlx5_core_dev *mdev = dev->mdev;
616 unsigned long flags;
617 int soft_polled = 0;
618 int npolled;
619
620 spin_lock_irqsave(&cq->lock, flags);
621 if (mdev->state == MLX5_DEVICE_STATE_INTERNAL_ERROR) {
622 /* make sure no soft wqe's are waiting */
623 if (unlikely(!list_empty(&cq->wc_list)))
624 soft_polled = poll_soft_wc(cq, num_entries, wc, true);
625
626 mlx5_ib_poll_sw_comp(cq, num_entries - soft_polled,
627 wc + soft_polled, &npolled);
628 goto out;
629 }
630
631 if (unlikely(!list_empty(&cq->wc_list)))
632 soft_polled = poll_soft_wc(cq, num_entries, wc, false);
633
634 for (npolled = 0; npolled < num_entries - soft_polled; npolled++) {
635 if (mlx5_poll_one(cq, &cur_qp, wc + soft_polled + npolled))
636 break;
637 }
638
639 if (npolled)
640 mlx5_cq_set_ci(&cq->mcq);
641out:
642 spin_unlock_irqrestore(&cq->lock, flags);
643
644 return soft_polled + npolled;
645}
646
647int mlx5_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
648{
649 struct mlx5_core_dev *mdev = to_mdev(ibcq->device)->mdev;
650 struct mlx5_ib_cq *cq = to_mcq(ibcq);
651 void __iomem *uar_page = mdev->priv.uar->map;
652 unsigned long irq_flags;
653 int ret = 0;
654
655 spin_lock_irqsave(&cq->lock, irq_flags);
656 if (cq->notify_flags != IB_CQ_NEXT_COMP)
657 cq->notify_flags = flags & IB_CQ_SOLICITED_MASK;
658
659 if ((flags & IB_CQ_REPORT_MISSED_EVENTS) && !list_empty(&cq->wc_list))
660 ret = 1;
661 spin_unlock_irqrestore(&cq->lock, irq_flags);
662
663 mlx5_cq_arm(&cq->mcq,
664 (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
665 MLX5_CQ_DB_REQ_NOT_SOL : MLX5_CQ_DB_REQ_NOT,
666 uar_page, to_mcq(ibcq)->mcq.cons_index);
667
668 return ret;
669}
670
671static int alloc_cq_frag_buf(struct mlx5_ib_dev *dev,
672 struct mlx5_ib_cq_buf *buf,
673 int nent,
674 int cqe_size)
675{
676 struct mlx5_frag_buf *frag_buf = &buf->frag_buf;
677 u8 log_wq_stride = 6 + (cqe_size == 128 ? 1 : 0);
678 u8 log_wq_sz = ilog2(cqe_size);
679 int err;
680
681 err = mlx5_frag_buf_alloc_node(dev->mdev,
682 nent * cqe_size,
683 frag_buf,
684 dev->mdev->priv.numa_node);
685 if (err)
686 return err;
687
688 mlx5_init_fbc(frag_buf->frags, log_wq_stride, log_wq_sz, &buf->fbc);
689
690 buf->cqe_size = cqe_size;
691 buf->nent = nent;
692
693 return 0;
694}
695
696enum {
697 MLX5_CQE_RES_FORMAT_HASH = 0,
698 MLX5_CQE_RES_FORMAT_CSUM = 1,
699 MLX5_CQE_RES_FORMAT_CSUM_STRIDX = 3,
700};
701
702static int mini_cqe_res_format_to_hw(struct mlx5_ib_dev *dev, u8 format)
703{
704 switch (format) {
705 case MLX5_IB_CQE_RES_FORMAT_HASH:
706 return MLX5_CQE_RES_FORMAT_HASH;
707 case MLX5_IB_CQE_RES_FORMAT_CSUM:
708 return MLX5_CQE_RES_FORMAT_CSUM;
709 case MLX5_IB_CQE_RES_FORMAT_CSUM_STRIDX:
710 if (MLX5_CAP_GEN(dev->mdev, mini_cqe_resp_stride_index))
711 return MLX5_CQE_RES_FORMAT_CSUM_STRIDX;
712 return -EOPNOTSUPP;
713 default:
714 return -EINVAL;
715 }
716}
717
718static int create_cq_user(struct mlx5_ib_dev *dev, struct ib_udata *udata,
719 struct mlx5_ib_cq *cq, int entries, u32 **cqb,
720 int *cqe_size, int *index, int *inlen,
721 struct uverbs_attr_bundle *attrs)
722{
723 struct mlx5_ib_create_cq ucmd = {};
724 unsigned long page_size;
725 unsigned int page_offset_quantized;
726 size_t ucmdlen;
727 __be64 *pas;
728 int ncont;
729 void *cqc;
730 int err;
731 struct mlx5_ib_ucontext *context = rdma_udata_to_drv_context(
732 udata, struct mlx5_ib_ucontext, ibucontext);
733
734 ucmdlen = min(udata->inlen, sizeof(ucmd));
735 if (ucmdlen < offsetof(struct mlx5_ib_create_cq, flags))
736 return -EINVAL;
737
738 if (ib_copy_from_udata(&ucmd, udata, ucmdlen))
739 return -EFAULT;
740
741 if ((ucmd.flags & ~(MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD |
742 MLX5_IB_CREATE_CQ_FLAGS_UAR_PAGE_INDEX |
743 MLX5_IB_CREATE_CQ_FLAGS_REAL_TIME_TS)))
744 return -EINVAL;
745
746 if ((ucmd.cqe_size != 64 && ucmd.cqe_size != 128) ||
747 ucmd.reserved0 || ucmd.reserved1)
748 return -EINVAL;
749
750 *cqe_size = ucmd.cqe_size;
751
752 cq->buf.umem =
753 ib_umem_get(&dev->ib_dev, ucmd.buf_addr,
754 entries * ucmd.cqe_size, IB_ACCESS_LOCAL_WRITE);
755 if (IS_ERR(cq->buf.umem)) {
756 err = PTR_ERR(cq->buf.umem);
757 return err;
758 }
759
760 page_size = mlx5_umem_find_best_cq_quantized_pgoff(
761 cq->buf.umem, cqc, log_page_size, MLX5_ADAPTER_PAGE_SHIFT,
762 page_offset, 64, &page_offset_quantized);
763 if (!page_size) {
764 err = -EINVAL;
765 goto err_umem;
766 }
767
768 err = mlx5_ib_db_map_user(context, ucmd.db_addr, &cq->db);
769 if (err)
770 goto err_umem;
771
772 ncont = ib_umem_num_dma_blocks(cq->buf.umem, page_size);
773 mlx5_ib_dbg(
774 dev,
775 "addr 0x%llx, size %u, npages %zu, page_size %lu, ncont %d\n",
776 ucmd.buf_addr, entries * ucmd.cqe_size,
777 ib_umem_num_pages(cq->buf.umem), page_size, ncont);
778
779 *inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
780 MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) * ncont;
781 *cqb = kvzalloc(*inlen, GFP_KERNEL);
782 if (!*cqb) {
783 err = -ENOMEM;
784 goto err_db;
785 }
786
787 pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas);
788 mlx5_ib_populate_pas(cq->buf.umem, page_size, pas, 0);
789
790 cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context);
791 MLX5_SET(cqc, cqc, log_page_size,
792 order_base_2(page_size) - MLX5_ADAPTER_PAGE_SHIFT);
793 MLX5_SET(cqc, cqc, page_offset, page_offset_quantized);
794
795 if (uverbs_attr_is_valid(attrs, MLX5_IB_ATTR_CREATE_CQ_UAR_INDEX)) {
796 err = uverbs_copy_from(index, attrs, MLX5_IB_ATTR_CREATE_CQ_UAR_INDEX);
797 if (err)
798 goto err_cqb;
799 } else if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_UAR_PAGE_INDEX) {
800 *index = ucmd.uar_page_index;
801 } else if (context->bfregi.lib_uar_dyn) {
802 err = -EINVAL;
803 goto err_cqb;
804 } else {
805 *index = context->bfregi.sys_pages[0];
806 }
807
808 if (ucmd.cqe_comp_en == 1) {
809 int mini_cqe_format;
810
811 if (!((*cqe_size == 128 &&
812 MLX5_CAP_GEN(dev->mdev, cqe_compression_128)) ||
813 (*cqe_size == 64 &&
814 MLX5_CAP_GEN(dev->mdev, cqe_compression)))) {
815 err = -EOPNOTSUPP;
816 mlx5_ib_warn(dev, "CQE compression is not supported for size %d!\n",
817 *cqe_size);
818 goto err_cqb;
819 }
820
821 mini_cqe_format =
822 mini_cqe_res_format_to_hw(dev,
823 ucmd.cqe_comp_res_format);
824 if (mini_cqe_format < 0) {
825 err = mini_cqe_format;
826 mlx5_ib_dbg(dev, "CQE compression res format %d error: %d\n",
827 ucmd.cqe_comp_res_format, err);
828 goto err_cqb;
829 }
830
831 MLX5_SET(cqc, cqc, cqe_comp_en, 1);
832 MLX5_SET(cqc, cqc, mini_cqe_res_format, mini_cqe_format);
833 }
834
835 if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_CQE_128B_PAD) {
836 if (*cqe_size != 128 ||
837 !MLX5_CAP_GEN(dev->mdev, cqe_128_always)) {
838 err = -EOPNOTSUPP;
839 mlx5_ib_warn(dev,
840 "CQE padding is not supported for CQE size of %dB!\n",
841 *cqe_size);
842 goto err_cqb;
843 }
844
845 cq->private_flags |= MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD;
846 }
847
848 if (ucmd.flags & MLX5_IB_CREATE_CQ_FLAGS_REAL_TIME_TS)
849 cq->private_flags |= MLX5_IB_CQ_PR_FLAGS_REAL_TIME_TS;
850
851 MLX5_SET(create_cq_in, *cqb, uid, context->devx_uid);
852 return 0;
853
854err_cqb:
855 kvfree(*cqb);
856
857err_db:
858 mlx5_ib_db_unmap_user(context, &cq->db);
859
860err_umem:
861 ib_umem_release(cq->buf.umem);
862 return err;
863}
864
865static void destroy_cq_user(struct mlx5_ib_cq *cq, struct ib_udata *udata)
866{
867 struct mlx5_ib_ucontext *context = rdma_udata_to_drv_context(
868 udata, struct mlx5_ib_ucontext, ibucontext);
869
870 mlx5_ib_db_unmap_user(context, &cq->db);
871 ib_umem_release(cq->buf.umem);
872}
873
874static void init_cq_frag_buf(struct mlx5_ib_cq_buf *buf)
875{
876 int i;
877 void *cqe;
878 struct mlx5_cqe64 *cqe64;
879
880 for (i = 0; i < buf->nent; i++) {
881 cqe = mlx5_frag_buf_get_wqe(&buf->fbc, i);
882 cqe64 = buf->cqe_size == 64 ? cqe : cqe + 64;
883 cqe64->op_own = MLX5_CQE_INVALID << 4;
884 }
885}
886
887static int create_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
888 int entries, int cqe_size,
889 u32 **cqb, int *index, int *inlen)
890{
891 __be64 *pas;
892 void *cqc;
893 int err;
894
895 err = mlx5_db_alloc(dev->mdev, &cq->db);
896 if (err)
897 return err;
898
899 cq->mcq.set_ci_db = cq->db.db;
900 cq->mcq.arm_db = cq->db.db + 1;
901 cq->mcq.cqe_sz = cqe_size;
902
903 err = alloc_cq_frag_buf(dev, &cq->buf, entries, cqe_size);
904 if (err)
905 goto err_db;
906
907 init_cq_frag_buf(&cq->buf);
908
909 *inlen = MLX5_ST_SZ_BYTES(create_cq_in) +
910 MLX5_FLD_SZ_BYTES(create_cq_in, pas[0]) *
911 cq->buf.frag_buf.npages;
912 *cqb = kvzalloc(*inlen, GFP_KERNEL);
913 if (!*cqb) {
914 err = -ENOMEM;
915 goto err_buf;
916 }
917
918 pas = (__be64 *)MLX5_ADDR_OF(create_cq_in, *cqb, pas);
919 mlx5_fill_page_frag_array(&cq->buf.frag_buf, pas);
920
921 cqc = MLX5_ADDR_OF(create_cq_in, *cqb, cq_context);
922 MLX5_SET(cqc, cqc, log_page_size,
923 cq->buf.frag_buf.page_shift -
924 MLX5_ADAPTER_PAGE_SHIFT);
925
926 *index = dev->mdev->priv.uar->index;
927
928 return 0;
929
930err_buf:
931 free_cq_buf(dev, &cq->buf);
932
933err_db:
934 mlx5_db_free(dev->mdev, &cq->db);
935 return err;
936}
937
938static void destroy_cq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq)
939{
940 free_cq_buf(dev, &cq->buf);
941 mlx5_db_free(dev->mdev, &cq->db);
942}
943
944static void notify_soft_wc_handler(struct work_struct *work)
945{
946 struct mlx5_ib_cq *cq = container_of(work, struct mlx5_ib_cq,
947 notify_work);
948
949 cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
950}
951
952int mlx5_ib_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
953 struct uverbs_attr_bundle *attrs)
954{
955 struct ib_udata *udata = &attrs->driver_udata;
956 struct ib_device *ibdev = ibcq->device;
957 int entries = attr->cqe;
958 int vector = attr->comp_vector;
959 struct mlx5_ib_dev *dev = to_mdev(ibdev);
960 struct mlx5_ib_cq *cq = to_mcq(ibcq);
961 u32 out[MLX5_ST_SZ_DW(create_cq_out)];
962 int index;
963 int inlen;
964 u32 *cqb = NULL;
965 void *cqc;
966 int cqe_size;
967 int eqn;
968 int err;
969
970 if (entries < 0 ||
971 (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))))
972 return -EINVAL;
973
974 if (check_cq_create_flags(attr->flags))
975 return -EOPNOTSUPP;
976
977 entries = roundup_pow_of_two(entries + 1);
978 if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)))
979 return -EINVAL;
980
981 cq->ibcq.cqe = entries - 1;
982 mutex_init(&cq->resize_mutex);
983 spin_lock_init(&cq->lock);
984 cq->resize_buf = NULL;
985 cq->resize_umem = NULL;
986 cq->create_flags = attr->flags;
987 INIT_LIST_HEAD(&cq->list_send_qp);
988 INIT_LIST_HEAD(&cq->list_recv_qp);
989
990 if (udata) {
991 err = create_cq_user(dev, udata, cq, entries, &cqb, &cqe_size,
992 &index, &inlen, attrs);
993 if (err)
994 return err;
995 } else {
996 cqe_size = cache_line_size() == 128 ? 128 : 64;
997 err = create_cq_kernel(dev, cq, entries, cqe_size, &cqb,
998 &index, &inlen);
999 if (err)
1000 return err;
1001
1002 INIT_WORK(&cq->notify_work, notify_soft_wc_handler);
1003 }
1004
1005 err = mlx5_comp_eqn_get(dev->mdev, vector, &eqn);
1006 if (err)
1007 goto err_cqb;
1008
1009 cq->cqe_size = cqe_size;
1010
1011 cqc = MLX5_ADDR_OF(create_cq_in, cqb, cq_context);
1012 MLX5_SET(cqc, cqc, cqe_sz,
1013 cqe_sz_to_mlx_sz(cqe_size,
1014 cq->private_flags &
1015 MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD));
1016 MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries));
1017 MLX5_SET(cqc, cqc, uar_page, index);
1018 MLX5_SET(cqc, cqc, c_eqn_or_apu_element, eqn);
1019 MLX5_SET64(cqc, cqc, dbr_addr, cq->db.dma);
1020 if (cq->create_flags & IB_UVERBS_CQ_FLAGS_IGNORE_OVERRUN)
1021 MLX5_SET(cqc, cqc, oi, 1);
1022
1023 err = mlx5_core_create_cq(dev->mdev, &cq->mcq, cqb, inlen, out, sizeof(out));
1024 if (err)
1025 goto err_cqb;
1026
1027 mlx5_ib_dbg(dev, "cqn 0x%x\n", cq->mcq.cqn);
1028 if (udata)
1029 cq->mcq.tasklet_ctx.comp = mlx5_ib_cq_comp;
1030 else
1031 cq->mcq.comp = mlx5_ib_cq_comp;
1032 cq->mcq.event = mlx5_ib_cq_event;
1033
1034 INIT_LIST_HEAD(&cq->wc_list);
1035
1036 if (udata)
1037 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof(__u32))) {
1038 err = -EFAULT;
1039 goto err_cmd;
1040 }
1041
1042
1043 kvfree(cqb);
1044 return 0;
1045
1046err_cmd:
1047 mlx5_core_destroy_cq(dev->mdev, &cq->mcq);
1048
1049err_cqb:
1050 kvfree(cqb);
1051 if (udata)
1052 destroy_cq_user(cq, udata);
1053 else
1054 destroy_cq_kernel(dev, cq);
1055 return err;
1056}
1057
1058int mlx5_ib_destroy_cq(struct ib_cq *cq, struct ib_udata *udata)
1059{
1060 struct mlx5_ib_dev *dev = to_mdev(cq->device);
1061 struct mlx5_ib_cq *mcq = to_mcq(cq);
1062 int ret;
1063
1064 ret = mlx5_core_destroy_cq(dev->mdev, &mcq->mcq);
1065 if (ret)
1066 return ret;
1067
1068 if (udata)
1069 destroy_cq_user(mcq, udata);
1070 else
1071 destroy_cq_kernel(dev, mcq);
1072 return 0;
1073}
1074
1075static int is_equal_rsn(struct mlx5_cqe64 *cqe64, u32 rsn)
1076{
1077 return rsn == (ntohl(cqe64->sop_drop_qpn) & 0xffffff);
1078}
1079
1080void __mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 rsn, struct mlx5_ib_srq *srq)
1081{
1082 struct mlx5_cqe64 *cqe64, *dest64;
1083 void *cqe, *dest;
1084 u32 prod_index;
1085 int nfreed = 0;
1086 u8 owner_bit;
1087
1088 if (!cq)
1089 return;
1090
1091 /* First we need to find the current producer index, so we
1092 * know where to start cleaning from. It doesn't matter if HW
1093 * adds new entries after this loop -- the QP we're worried
1094 * about is already in RESET, so the new entries won't come
1095 * from our QP and therefore don't need to be checked.
1096 */
1097 for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); prod_index++)
1098 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
1099 break;
1100
1101 /* Now sweep backwards through the CQ, removing CQ entries
1102 * that match our QP by copying older entries on top of them.
1103 */
1104 while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
1105 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
1106 cqe64 = (cq->mcq.cqe_sz == 64) ? cqe : cqe + 64;
1107 if (is_equal_rsn(cqe64, rsn)) {
1108 if (srq && (ntohl(cqe64->srqn) & 0xffffff))
1109 mlx5_ib_free_srq_wqe(srq, be16_to_cpu(cqe64->wqe_counter));
1110 ++nfreed;
1111 } else if (nfreed) {
1112 dest = get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe);
1113 dest64 = (cq->mcq.cqe_sz == 64) ? dest : dest + 64;
1114 owner_bit = dest64->op_own & MLX5_CQE_OWNER_MASK;
1115 memcpy(dest, cqe, cq->mcq.cqe_sz);
1116 dest64->op_own = owner_bit |
1117 (dest64->op_own & ~MLX5_CQE_OWNER_MASK);
1118 }
1119 }
1120
1121 if (nfreed) {
1122 cq->mcq.cons_index += nfreed;
1123 /* Make sure update of buffer contents is done before
1124 * updating consumer index.
1125 */
1126 wmb();
1127 mlx5_cq_set_ci(&cq->mcq);
1128 }
1129}
1130
1131void mlx5_ib_cq_clean(struct mlx5_ib_cq *cq, u32 qpn, struct mlx5_ib_srq *srq)
1132{
1133 if (!cq)
1134 return;
1135
1136 spin_lock_irq(&cq->lock);
1137 __mlx5_ib_cq_clean(cq, qpn, srq);
1138 spin_unlock_irq(&cq->lock);
1139}
1140
1141int mlx5_ib_modify_cq(struct ib_cq *cq, u16 cq_count, u16 cq_period)
1142{
1143 struct mlx5_ib_dev *dev = to_mdev(cq->device);
1144 struct mlx5_ib_cq *mcq = to_mcq(cq);
1145 int err;
1146
1147 if (!MLX5_CAP_GEN(dev->mdev, cq_moderation))
1148 return -EOPNOTSUPP;
1149
1150 if (cq_period > MLX5_MAX_CQ_PERIOD)
1151 return -EINVAL;
1152
1153 err = mlx5_core_modify_cq_moderation(dev->mdev, &mcq->mcq,
1154 cq_period, cq_count);
1155 if (err)
1156 mlx5_ib_warn(dev, "modify cq 0x%x failed\n", mcq->mcq.cqn);
1157
1158 return err;
1159}
1160
1161static int resize_user(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
1162 int entries, struct ib_udata *udata,
1163 int *cqe_size)
1164{
1165 struct mlx5_ib_resize_cq ucmd;
1166 struct ib_umem *umem;
1167 int err;
1168
1169 err = ib_copy_from_udata(&ucmd, udata, sizeof(ucmd));
1170 if (err)
1171 return err;
1172
1173 if (ucmd.reserved0 || ucmd.reserved1)
1174 return -EINVAL;
1175
1176 /* check multiplication overflow */
1177 if (ucmd.cqe_size && SIZE_MAX / ucmd.cqe_size <= entries - 1)
1178 return -EINVAL;
1179
1180 umem = ib_umem_get(&dev->ib_dev, ucmd.buf_addr,
1181 (size_t)ucmd.cqe_size * entries,
1182 IB_ACCESS_LOCAL_WRITE);
1183 if (IS_ERR(umem)) {
1184 err = PTR_ERR(umem);
1185 return err;
1186 }
1187
1188 cq->resize_umem = umem;
1189 *cqe_size = ucmd.cqe_size;
1190
1191 return 0;
1192}
1193
1194static int resize_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_cq *cq,
1195 int entries, int cqe_size)
1196{
1197 int err;
1198
1199 cq->resize_buf = kzalloc(sizeof(*cq->resize_buf), GFP_KERNEL);
1200 if (!cq->resize_buf)
1201 return -ENOMEM;
1202
1203 err = alloc_cq_frag_buf(dev, cq->resize_buf, entries, cqe_size);
1204 if (err)
1205 goto ex;
1206
1207 init_cq_frag_buf(cq->resize_buf);
1208
1209 return 0;
1210
1211ex:
1212 kfree(cq->resize_buf);
1213 return err;
1214}
1215
1216static int copy_resize_cqes(struct mlx5_ib_cq *cq)
1217{
1218 struct mlx5_ib_dev *dev = to_mdev(cq->ibcq.device);
1219 struct mlx5_cqe64 *scqe64;
1220 struct mlx5_cqe64 *dcqe64;
1221 void *start_cqe;
1222 void *scqe;
1223 void *dcqe;
1224 int ssize;
1225 int dsize;
1226 int i;
1227 u8 sw_own;
1228
1229 ssize = cq->buf.cqe_size;
1230 dsize = cq->resize_buf->cqe_size;
1231 if (ssize != dsize) {
1232 mlx5_ib_warn(dev, "resize from different cqe size is not supported\n");
1233 return -EINVAL;
1234 }
1235
1236 i = cq->mcq.cons_index;
1237 scqe = get_sw_cqe(cq, i);
1238 scqe64 = ssize == 64 ? scqe : scqe + 64;
1239 start_cqe = scqe;
1240 if (!scqe) {
1241 mlx5_ib_warn(dev, "expected cqe in sw ownership\n");
1242 return -EINVAL;
1243 }
1244
1245 while (get_cqe_opcode(scqe64) != MLX5_CQE_RESIZE_CQ) {
1246 dcqe = mlx5_frag_buf_get_wqe(&cq->resize_buf->fbc,
1247 (i + 1) & cq->resize_buf->nent);
1248 dcqe64 = dsize == 64 ? dcqe : dcqe + 64;
1249 sw_own = sw_ownership_bit(i + 1, cq->resize_buf->nent);
1250 memcpy(dcqe, scqe, dsize);
1251 dcqe64->op_own = (dcqe64->op_own & ~MLX5_CQE_OWNER_MASK) | sw_own;
1252
1253 ++i;
1254 scqe = get_sw_cqe(cq, i);
1255 scqe64 = ssize == 64 ? scqe : scqe + 64;
1256 if (!scqe) {
1257 mlx5_ib_warn(dev, "expected cqe in sw ownership\n");
1258 return -EINVAL;
1259 }
1260
1261 if (scqe == start_cqe) {
1262 pr_warn("resize CQ failed to get resize CQE, CQN 0x%x\n",
1263 cq->mcq.cqn);
1264 return -ENOMEM;
1265 }
1266 }
1267 ++cq->mcq.cons_index;
1268 return 0;
1269}
1270
1271int mlx5_ib_resize_cq(struct ib_cq *ibcq, int entries, struct ib_udata *udata)
1272{
1273 struct mlx5_ib_dev *dev = to_mdev(ibcq->device);
1274 struct mlx5_ib_cq *cq = to_mcq(ibcq);
1275 void *cqc;
1276 u32 *in;
1277 int err;
1278 int npas;
1279 __be64 *pas;
1280 unsigned int page_offset_quantized = 0;
1281 unsigned int page_shift;
1282 int inlen;
1283 int cqe_size;
1284 unsigned long flags;
1285
1286 if (!MLX5_CAP_GEN(dev->mdev, cq_resize)) {
1287 pr_info("Firmware does not support resize CQ\n");
1288 return -ENOSYS;
1289 }
1290
1291 if (entries < 1 ||
1292 entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz))) {
1293 mlx5_ib_warn(dev, "wrong entries number %d, max %d\n",
1294 entries,
1295 1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz));
1296 return -EINVAL;
1297 }
1298
1299 entries = roundup_pow_of_two(entries + 1);
1300 if (entries > (1 << MLX5_CAP_GEN(dev->mdev, log_max_cq_sz)) + 1)
1301 return -EINVAL;
1302
1303 if (entries == ibcq->cqe + 1)
1304 return 0;
1305
1306 mutex_lock(&cq->resize_mutex);
1307 if (udata) {
1308 unsigned long page_size;
1309
1310 err = resize_user(dev, cq, entries, udata, &cqe_size);
1311 if (err)
1312 goto ex;
1313
1314 page_size = mlx5_umem_find_best_cq_quantized_pgoff(
1315 cq->resize_umem, cqc, log_page_size,
1316 MLX5_ADAPTER_PAGE_SHIFT, page_offset, 64,
1317 &page_offset_quantized);
1318 if (!page_size) {
1319 err = -EINVAL;
1320 goto ex_resize;
1321 }
1322 npas = ib_umem_num_dma_blocks(cq->resize_umem, page_size);
1323 page_shift = order_base_2(page_size);
1324 } else {
1325 struct mlx5_frag_buf *frag_buf;
1326
1327 cqe_size = 64;
1328 err = resize_kernel(dev, cq, entries, cqe_size);
1329 if (err)
1330 goto ex;
1331 frag_buf = &cq->resize_buf->frag_buf;
1332 npas = frag_buf->npages;
1333 page_shift = frag_buf->page_shift;
1334 }
1335
1336 inlen = MLX5_ST_SZ_BYTES(modify_cq_in) +
1337 MLX5_FLD_SZ_BYTES(modify_cq_in, pas[0]) * npas;
1338
1339 in = kvzalloc(inlen, GFP_KERNEL);
1340 if (!in) {
1341 err = -ENOMEM;
1342 goto ex_resize;
1343 }
1344
1345 pas = (__be64 *)MLX5_ADDR_OF(modify_cq_in, in, pas);
1346 if (udata)
1347 mlx5_ib_populate_pas(cq->resize_umem, 1UL << page_shift, pas,
1348 0);
1349 else
1350 mlx5_fill_page_frag_array(&cq->resize_buf->frag_buf, pas);
1351
1352 MLX5_SET(modify_cq_in, in,
1353 modify_field_select_resize_field_select.resize_field_select.resize_field_select,
1354 MLX5_MODIFY_CQ_MASK_LOG_SIZE |
1355 MLX5_MODIFY_CQ_MASK_PG_OFFSET |
1356 MLX5_MODIFY_CQ_MASK_PG_SIZE);
1357
1358 cqc = MLX5_ADDR_OF(modify_cq_in, in, cq_context);
1359
1360 MLX5_SET(cqc, cqc, log_page_size,
1361 page_shift - MLX5_ADAPTER_PAGE_SHIFT);
1362 MLX5_SET(cqc, cqc, page_offset, page_offset_quantized);
1363 MLX5_SET(cqc, cqc, cqe_sz,
1364 cqe_sz_to_mlx_sz(cqe_size,
1365 cq->private_flags &
1366 MLX5_IB_CQ_PR_FLAGS_CQE_128_PAD));
1367 MLX5_SET(cqc, cqc, log_cq_size, ilog2(entries));
1368
1369 MLX5_SET(modify_cq_in, in, op_mod, MLX5_CQ_OPMOD_RESIZE);
1370 MLX5_SET(modify_cq_in, in, cqn, cq->mcq.cqn);
1371
1372 err = mlx5_core_modify_cq(dev->mdev, &cq->mcq, in, inlen);
1373 if (err)
1374 goto ex_alloc;
1375
1376 if (udata) {
1377 cq->ibcq.cqe = entries - 1;
1378 ib_umem_release(cq->buf.umem);
1379 cq->buf.umem = cq->resize_umem;
1380 cq->resize_umem = NULL;
1381 } else {
1382 struct mlx5_ib_cq_buf tbuf;
1383 int resized = 0;
1384
1385 spin_lock_irqsave(&cq->lock, flags);
1386 if (cq->resize_buf) {
1387 err = copy_resize_cqes(cq);
1388 if (!err) {
1389 tbuf = cq->buf;
1390 cq->buf = *cq->resize_buf;
1391 kfree(cq->resize_buf);
1392 cq->resize_buf = NULL;
1393 resized = 1;
1394 }
1395 }
1396 cq->ibcq.cqe = entries - 1;
1397 spin_unlock_irqrestore(&cq->lock, flags);
1398 if (resized)
1399 free_cq_buf(dev, &tbuf);
1400 }
1401 mutex_unlock(&cq->resize_mutex);
1402
1403 kvfree(in);
1404 return 0;
1405
1406ex_alloc:
1407 kvfree(in);
1408
1409ex_resize:
1410 ib_umem_release(cq->resize_umem);
1411 if (!udata) {
1412 free_cq_buf(dev, cq->resize_buf);
1413 cq->resize_buf = NULL;
1414 }
1415ex:
1416 mutex_unlock(&cq->resize_mutex);
1417 return err;
1418}
1419
1420int mlx5_ib_get_cqe_size(struct ib_cq *ibcq)
1421{
1422 struct mlx5_ib_cq *cq;
1423
1424 if (!ibcq)
1425 return 128;
1426
1427 cq = to_mcq(ibcq);
1428 return cq->cqe_size;
1429}
1430
1431/* Called from atomic context */
1432int mlx5_ib_generate_wc(struct ib_cq *ibcq, struct ib_wc *wc)
1433{
1434 struct mlx5_ib_wc *soft_wc;
1435 struct mlx5_ib_cq *cq = to_mcq(ibcq);
1436 unsigned long flags;
1437
1438 soft_wc = kmalloc(sizeof(*soft_wc), GFP_ATOMIC);
1439 if (!soft_wc)
1440 return -ENOMEM;
1441
1442 soft_wc->wc = *wc;
1443 spin_lock_irqsave(&cq->lock, flags);
1444 list_add_tail(&soft_wc->list, &cq->wc_list);
1445 if (cq->notify_flags == IB_CQ_NEXT_COMP ||
1446 wc->status != IB_WC_SUCCESS) {
1447 cq->notify_flags = 0;
1448 schedule_work(&cq->notify_work);
1449 }
1450 spin_unlock_irqrestore(&cq->lock, flags);
1451
1452 return 0;
1453}
1454
1455ADD_UVERBS_ATTRIBUTES_SIMPLE(
1456 mlx5_ib_cq_create,
1457 UVERBS_OBJECT_CQ,
1458 UVERBS_METHOD_CQ_CREATE,
1459 UVERBS_ATTR_PTR_IN(
1460 MLX5_IB_ATTR_CREATE_CQ_UAR_INDEX,
1461 UVERBS_ATTR_TYPE(u32),
1462 UA_OPTIONAL));
1463
1464const struct uapi_definition mlx5_ib_create_cq_defs[] = {
1465 UAPI_DEF_CHAIN_OBJ_TREE(UVERBS_OBJECT_CQ, &mlx5_ib_cq_create),
1466 {},
1467};