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Revert "[PATCH] paravirt: Add startup infrastructure for paravirtualization"
[pv_ops_mirror.git] / drivers / infiniband / hw / mlx4 / cq.c
blobb2a290c6703a4b59634daf93763b43ab4cbc5a86
1 /*
2 * Copyright (c) 2007 Cisco Systems, Inc. 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/mlx4/cq.h>
34 #include <linux/mlx4/qp.h>
35
36 #include "mlx4_ib.h"
37 #include "user.h"
38
39 static void mlx4_ib_cq_comp(struct mlx4_cq *cq)
40 {
41 struct ib_cq *ibcq = &to_mibcq(cq)->ibcq;
42 ibcq->comp_handler(ibcq, ibcq->cq_context);
43 }
44
45 static void mlx4_ib_cq_event(struct mlx4_cq *cq, enum mlx4_event type)
46 {
47 struct ib_event event;
48 struct ib_cq *ibcq;
49
50 if (type != MLX4_EVENT_TYPE_CQ_ERROR) {
51 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
52 "on CQ %06x\n", type, cq->cqn);
53 return;
54 }
55
56 ibcq = &to_mibcq(cq)->ibcq;
57 if (ibcq->event_handler) {
58 event.device = ibcq->device;
59 event.event = IB_EVENT_CQ_ERR;
60 event.element.cq = ibcq;
61 ibcq->event_handler(&event, ibcq->cq_context);
62 }
63 }
64
65 static void *get_cqe_from_buf(struct mlx4_ib_cq_buf *buf, int n)
66 {
67 int offset = n * sizeof (struct mlx4_cqe);
68
69 if (buf->buf.nbufs == 1)
70 return buf->buf.u.direct.buf + offset;
71 else
72 return buf->buf.u.page_list[offset >> PAGE_SHIFT].buf +
73 (offset & (PAGE_SIZE - 1));
74 }
75
76 static void *get_cqe(struct mlx4_ib_cq *cq, int n)
77 {
78 return get_cqe_from_buf(&cq->buf, n);
79 }
80
81 static void *get_sw_cqe(struct mlx4_ib_cq *cq, int n)
82 {
83 struct mlx4_cqe *cqe = get_cqe(cq, n & cq->ibcq.cqe);
84
85 return (!!(cqe->owner_sr_opcode & MLX4_CQE_OWNER_MASK) ^
86 !!(n & (cq->ibcq.cqe + 1))) ? NULL : cqe;
87 }
88
89 static struct mlx4_cqe *next_cqe_sw(struct mlx4_ib_cq *cq)
90 {
91 return get_sw_cqe(cq, cq->mcq.cons_index);
92 }
93
94 struct ib_cq *mlx4_ib_create_cq(struct ib_device *ibdev, int entries, int vector,
95 struct ib_ucontext *context,
96 struct ib_udata *udata)
97 {
98 struct mlx4_ib_dev *dev = to_mdev(ibdev);
99 struct mlx4_ib_cq *cq;
100 struct mlx4_uar *uar;
101 int buf_size;
102 int err;
103
104 if (entries < 1 || entries > dev->dev->caps.max_cqes)
105 return ERR_PTR(-EINVAL);
106
107 cq = kmalloc(sizeof *cq, GFP_KERNEL);
108 if (!cq)
109 return ERR_PTR(-ENOMEM);
110
111 entries = roundup_pow_of_two(entries + 1);
112 cq->ibcq.cqe = entries - 1;
113 buf_size = entries * sizeof (struct mlx4_cqe);
114 spin_lock_init(&cq->lock);
115
116 if (context) {
117 struct mlx4_ib_create_cq ucmd;
118
119 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
120 err = -EFAULT;
121 goto err_cq;
122 }
123
124 cq->umem = ib_umem_get(context, ucmd.buf_addr, buf_size,
125 IB_ACCESS_LOCAL_WRITE);
126 if (IS_ERR(cq->umem)) {
127 err = PTR_ERR(cq->umem);
128 goto err_cq;
129 }
130
131 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(cq->umem),
132 ilog2(cq->umem->page_size), &cq->buf.mtt);
133 if (err)
134 goto err_buf;
135
136 err = mlx4_ib_umem_write_mtt(dev, &cq->buf.mtt, cq->umem);
137 if (err)
138 goto err_mtt;
139
140 err = mlx4_ib_db_map_user(to_mucontext(context), ucmd.db_addr,
141 &cq->db);
142 if (err)
143 goto err_mtt;
144
145 uar = &to_mucontext(context)->uar;
146 } else {
147 err = mlx4_ib_db_alloc(dev, &cq->db, 1);
148 if (err)
149 goto err_cq;
150
151 cq->mcq.set_ci_db = cq->db.db;
152 cq->mcq.arm_db = cq->db.db + 1;
153 *cq->mcq.set_ci_db = 0;
154 *cq->mcq.arm_db = 0;
155
156 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &cq->buf.buf)) {
157 err = -ENOMEM;
158 goto err_db;
159 }
160
161 err = mlx4_mtt_init(dev->dev, cq->buf.buf.npages, cq->buf.buf.page_shift,
162 &cq->buf.mtt);
163 if (err)
164 goto err_buf;
165
166 err = mlx4_buf_write_mtt(dev->dev, &cq->buf.mtt, &cq->buf.buf);
167 if (err)
168 goto err_mtt;
169
170 uar = &dev->priv_uar;
171 }
172
173 err = mlx4_cq_alloc(dev->dev, entries, &cq->buf.mtt, uar,
174 cq->db.dma, &cq->mcq);
175 if (err)
176 goto err_dbmap;
177
178 cq->mcq.comp = mlx4_ib_cq_comp;
179 cq->mcq.event = mlx4_ib_cq_event;
180
181 if (context)
182 if (ib_copy_to_udata(udata, &cq->mcq.cqn, sizeof (__u32))) {
183 err = -EFAULT;
184 goto err_dbmap;
185 }
186
187 return &cq->ibcq;
188
189 err_dbmap:
190 if (context)
191 mlx4_ib_db_unmap_user(to_mucontext(context), &cq->db);
192
193 err_mtt:
194 mlx4_mtt_cleanup(dev->dev, &cq->buf.mtt);
195
196 err_buf:
197 if (context)
198 ib_umem_release(cq->umem);
199 else
200 mlx4_buf_free(dev->dev, entries * sizeof (struct mlx4_cqe),
201 &cq->buf.buf);
202
203 err_db:
204 if (!context)
205 mlx4_ib_db_free(dev, &cq->db);
206
207 err_cq:
208 kfree(cq);
209
210 return ERR_PTR(err);
211 }
212
213 int mlx4_ib_destroy_cq(struct ib_cq *cq)
214 {
215 struct mlx4_ib_dev *dev = to_mdev(cq->device);
216 struct mlx4_ib_cq *mcq = to_mcq(cq);
217
218 mlx4_cq_free(dev->dev, &mcq->mcq);
219 mlx4_mtt_cleanup(dev->dev, &mcq->buf.mtt);
220
221 if (cq->uobject) {
222 mlx4_ib_db_unmap_user(to_mucontext(cq->uobject->context), &mcq->db);
223 ib_umem_release(mcq->umem);
224 } else {
225 mlx4_buf_free(dev->dev, (cq->cqe + 1) * sizeof (struct mlx4_cqe),
226 &mcq->buf.buf);
227 mlx4_ib_db_free(dev, &mcq->db);
228 }
229
230 kfree(mcq);
231
232 return 0;
233 }
234
235 static void dump_cqe(void *cqe)
236 {
237 __be32 *buf = cqe;
238
239 printk(KERN_DEBUG "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
240 be32_to_cpu(buf[0]), be32_to_cpu(buf[1]), be32_to_cpu(buf[2]),
241 be32_to_cpu(buf[3]), be32_to_cpu(buf[4]), be32_to_cpu(buf[5]),
242 be32_to_cpu(buf[6]), be32_to_cpu(buf[7]));
243 }
244
245 static void mlx4_ib_handle_error_cqe(struct mlx4_err_cqe *cqe,
246 struct ib_wc *wc)
247 {
248 if (cqe->syndrome == MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR) {
249 printk(KERN_DEBUG "local QP operation err "
250 "(QPN %06x, WQE index %x, vendor syndrome %02x, "
251 "opcode = %02x)\n",
252 be32_to_cpu(cqe->my_qpn), be16_to_cpu(cqe->wqe_index),
253 cqe->vendor_err_syndrome,
254 cqe->owner_sr_opcode & ~MLX4_CQE_OWNER_MASK);
255 dump_cqe(cqe);
256 }
257
258 switch (cqe->syndrome) {
259 case MLX4_CQE_SYNDROME_LOCAL_LENGTH_ERR:
260 wc->status = IB_WC_LOC_LEN_ERR;
261 break;
262 case MLX4_CQE_SYNDROME_LOCAL_QP_OP_ERR:
263 wc->status = IB_WC_LOC_QP_OP_ERR;
264 break;
265 case MLX4_CQE_SYNDROME_LOCAL_PROT_ERR:
266 wc->status = IB_WC_LOC_PROT_ERR;
267 break;
268 case MLX4_CQE_SYNDROME_WR_FLUSH_ERR:
269 wc->status = IB_WC_WR_FLUSH_ERR;
270 break;
271 case MLX4_CQE_SYNDROME_MW_BIND_ERR:
272 wc->status = IB_WC_MW_BIND_ERR;
273 break;
274 case MLX4_CQE_SYNDROME_BAD_RESP_ERR:
275 wc->status = IB_WC_BAD_RESP_ERR;
276 break;
277 case MLX4_CQE_SYNDROME_LOCAL_ACCESS_ERR:
278 wc->status = IB_WC_LOC_ACCESS_ERR;
279 break;
280 case MLX4_CQE_SYNDROME_REMOTE_INVAL_REQ_ERR:
281 wc->status = IB_WC_REM_INV_REQ_ERR;
282 break;
283 case MLX4_CQE_SYNDROME_REMOTE_ACCESS_ERR:
284 wc->status = IB_WC_REM_ACCESS_ERR;
285 break;
286 case MLX4_CQE_SYNDROME_REMOTE_OP_ERR:
287 wc->status = IB_WC_REM_OP_ERR;
288 break;
289 case MLX4_CQE_SYNDROME_TRANSPORT_RETRY_EXC_ERR:
290 wc->status = IB_WC_RETRY_EXC_ERR;
291 break;
292 case MLX4_CQE_SYNDROME_RNR_RETRY_EXC_ERR:
293 wc->status = IB_WC_RNR_RETRY_EXC_ERR;
294 break;
295 case MLX4_CQE_SYNDROME_REMOTE_ABORTED_ERR:
296 wc->status = IB_WC_REM_ABORT_ERR;
297 break;
298 default:
299 wc->status = IB_WC_GENERAL_ERR;
300 break;
301 }
302
303 wc->vendor_err = cqe->vendor_err_syndrome;
304 }
305
306 static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
307 struct mlx4_ib_qp **cur_qp,
308 struct ib_wc *wc)
309 {
310 struct mlx4_cqe *cqe;
311 struct mlx4_qp *mqp;
312 struct mlx4_ib_wq *wq;
313 struct mlx4_ib_srq *srq;
314 int is_send;
315 int is_error;
316 u16 wqe_ctr;
317
318 cqe = next_cqe_sw(cq);
319 if (!cqe)
320 return -EAGAIN;
321
322 ++cq->mcq.cons_index;
323
324 /*
325 * Make sure we read CQ entry contents after we've checked the
326 * ownership bit.
327 */
328 rmb();
329
330 is_send = cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK;
331 is_error = (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) ==
332 MLX4_CQE_OPCODE_ERROR;
333
334 if (!*cur_qp ||
335 (be32_to_cpu(cqe->my_qpn) & 0xffffff) != (*cur_qp)->mqp.qpn) {
336 /*
337 * We do not have to take the QP table lock here,
338 * because CQs will be locked while QPs are removed
339 * from the table.
340 */
341 mqp = __mlx4_qp_lookup(to_mdev(cq->ibcq.device)->dev,
342 be32_to_cpu(cqe->my_qpn));
343 if (unlikely(!mqp)) {
344 printk(KERN_WARNING "CQ %06x with entry for unknown QPN %06x\n",
345 cq->mcq.cqn, be32_to_cpu(cqe->my_qpn) & 0xffffff);
346 return -EINVAL;
347 }
348
349 *cur_qp = to_mibqp(mqp);
350 }
351
352 wc->qp = &(*cur_qp)->ibqp;
353
354 if (is_send) {
355 wq = &(*cur_qp)->sq;
356 wqe_ctr = be16_to_cpu(cqe->wqe_index);
357 wq->tail += wqe_ctr - (u16) wq->tail;
358 wc->wr_id = wq->wrid[wq->tail & (wq->max - 1)];
359 ++wq->tail;
360 } else if ((*cur_qp)->ibqp.srq) {
361 srq = to_msrq((*cur_qp)->ibqp.srq);
362 wqe_ctr = be16_to_cpu(cqe->wqe_index);
363 wc->wr_id = srq->wrid[wqe_ctr];
364 mlx4_ib_free_srq_wqe(srq, wqe_ctr);
365 } else {
366 wq = &(*cur_qp)->rq;
367 wc->wr_id = wq->wrid[wq->tail & (wq->max - 1)];
368 ++wq->tail;
369 }
370
371 if (unlikely(is_error)) {
372 mlx4_ib_handle_error_cqe((struct mlx4_err_cqe *) cqe, wc);
373 return 0;
374 }
375
376 wc->status = IB_WC_SUCCESS;
377
378 if (is_send) {
379 wc->wc_flags = 0;
380 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
381 case MLX4_OPCODE_RDMA_WRITE_IMM:
382 wc->wc_flags |= IB_WC_WITH_IMM;
383 case MLX4_OPCODE_RDMA_WRITE:
384 wc->opcode = IB_WC_RDMA_WRITE;
385 break;
386 case MLX4_OPCODE_SEND_IMM:
387 wc->wc_flags |= IB_WC_WITH_IMM;
388 case MLX4_OPCODE_SEND:
389 wc->opcode = IB_WC_SEND;
390 break;
391 case MLX4_OPCODE_RDMA_READ:
392 wc->opcode = IB_WC_SEND;
393 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
394 break;
395 case MLX4_OPCODE_ATOMIC_CS:
396 wc->opcode = IB_WC_COMP_SWAP;
397 wc->byte_len = 8;
398 break;
399 case MLX4_OPCODE_ATOMIC_FA:
400 wc->opcode = IB_WC_FETCH_ADD;
401 wc->byte_len = 8;
402 break;
403 case MLX4_OPCODE_BIND_MW:
404 wc->opcode = IB_WC_BIND_MW;
405 break;
406 }
407 } else {
408 wc->byte_len = be32_to_cpu(cqe->byte_cnt);
409
410 switch (cqe->owner_sr_opcode & MLX4_CQE_OPCODE_MASK) {
411 case MLX4_RECV_OPCODE_RDMA_WRITE_IMM:
412 wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
413 wc->wc_flags = IB_WC_WITH_IMM;
414 wc->imm_data = cqe->immed_rss_invalid;
415 break;
416 case MLX4_RECV_OPCODE_SEND:
417 wc->opcode = IB_WC_RECV;
418 wc->wc_flags = 0;
419 break;
420 case MLX4_RECV_OPCODE_SEND_IMM:
421 wc->opcode = IB_WC_RECV;
422 wc->wc_flags = IB_WC_WITH_IMM;
423 wc->imm_data = cqe->immed_rss_invalid;
424 break;
425 }
426
427 wc->slid = be16_to_cpu(cqe->rlid);
428 wc->sl = cqe->sl >> 4;
429 wc->src_qp = be32_to_cpu(cqe->g_mlpath_rqpn) & 0xffffff;
430 wc->dlid_path_bits = (be32_to_cpu(cqe->g_mlpath_rqpn) >> 24) & 0x7f;
431 wc->wc_flags |= be32_to_cpu(cqe->g_mlpath_rqpn) & 0x80000000 ?
432 IB_WC_GRH : 0;
433 wc->pkey_index = be32_to_cpu(cqe->immed_rss_invalid) >> 16;
434 }
435
436 return 0;
437 }
438
439 int mlx4_ib_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *wc)
440 {
441 struct mlx4_ib_cq *cq = to_mcq(ibcq);
442 struct mlx4_ib_qp *cur_qp = NULL;
443 unsigned long flags;
444 int npolled;
445 int err = 0;
446
447 spin_lock_irqsave(&cq->lock, flags);
448
449 for (npolled = 0; npolled < num_entries; ++npolled) {
450 err = mlx4_ib_poll_one(cq, &cur_qp, wc + npolled);
451 if (err)
452 break;
453 }
454
455 if (npolled)
456 mlx4_cq_set_ci(&cq->mcq);
457
458 spin_unlock_irqrestore(&cq->lock, flags);
459
460 if (err == 0 || err == -EAGAIN)
461 return npolled;
462 else
463 return err;
464 }
465
466 int mlx4_ib_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
467 {
468 mlx4_cq_arm(&to_mcq(ibcq)->mcq,
469 (flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
470 MLX4_CQ_DB_REQ_NOT_SOL : MLX4_CQ_DB_REQ_NOT,
471 to_mdev(ibcq->device)->uar_map,
472 MLX4_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->uar_lock));
473
474 return 0;
475 }
476
477 void __mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
478 {
479 u32 prod_index;
480 int nfreed = 0;
481 struct mlx4_cqe *cqe;
482
483 /*
484 * First we need to find the current producer index, so we
485 * know where to start cleaning from. It doesn't matter if HW
486 * adds new entries after this loop -- the QP we're worried
487 * about is already in RESET, so the new entries won't come
488 * from our QP and therefore don't need to be checked.
489 */
490 for (prod_index = cq->mcq.cons_index; get_sw_cqe(cq, prod_index); ++prod_index)
491 if (prod_index == cq->mcq.cons_index + cq->ibcq.cqe)
492 break;
493
494 /*
495 * Now sweep backwards through the CQ, removing CQ entries
496 * that match our QP by copying older entries on top of them.
497 */
498 while ((int) --prod_index - (int) cq->mcq.cons_index >= 0) {
499 cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
500 if ((be32_to_cpu(cqe->my_qpn) & 0xffffff) == qpn) {
501 if (srq && !(cqe->owner_sr_opcode & MLX4_CQE_IS_SEND_MASK))
502 mlx4_ib_free_srq_wqe(srq, be16_to_cpu(cqe->wqe_index));
503 ++nfreed;
504 } else if (nfreed)
505 memcpy(get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe),
506 cqe, sizeof *cqe);
507 }
508
509 if (nfreed) {
510 cq->mcq.cons_index += nfreed;
511 /*
512 * Make sure update of buffer contents is done before
513 * updating consumer index.
514 */
515 wmb();
516 mlx4_cq_set_ci(&cq->mcq);
517 }
518 }
519
520 void mlx4_ib_cq_clean(struct mlx4_ib_cq *cq, u32 qpn, struct mlx4_ib_srq *srq)
521 {
522 spin_lock_irq(&cq->lock);
523 __mlx4_ib_cq_clean(cq, qpn, srq);
524 spin_unlock_irq(&cq->lock);
525 }
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