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IB/mlx4: Factor out setting WQE data segment entries
[pv_ops_mirror.git] / drivers / infiniband / hw / mlx4 / qp.c
bloba59c7f04ca1838fc86379f954aa7b36c4ba7ab83
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 <rdma/ib_cache.h>
34 #include <rdma/ib_pack.h>
35
36 #include <linux/mlx4/qp.h>
37
38 #include "mlx4_ib.h"
39 #include "user.h"
40
41 enum {
42 MLX4_IB_ACK_REQ_FREQ = 8,
43 };
44
45 enum {
46 MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83,
47 MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f
48 };
49
50 enum {
51 /*
52 * Largest possible UD header: send with GRH and immediate data.
53 */
54 MLX4_IB_UD_HEADER_SIZE = 72
55 };
56
57 struct mlx4_ib_sqp {
58 struct mlx4_ib_qp qp;
59 int pkey_index;
60 u32 qkey;
61 u32 send_psn;
62 struct ib_ud_header ud_header;
63 u8 header_buf[MLX4_IB_UD_HEADER_SIZE];
64 };
65
66 static const __be32 mlx4_ib_opcode[] = {
67 [IB_WR_SEND] = __constant_cpu_to_be32(MLX4_OPCODE_SEND),
68 [IB_WR_SEND_WITH_IMM] = __constant_cpu_to_be32(MLX4_OPCODE_SEND_IMM),
69 [IB_WR_RDMA_WRITE] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
70 [IB_WR_RDMA_WRITE_WITH_IMM] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
71 [IB_WR_RDMA_READ] = __constant_cpu_to_be32(MLX4_OPCODE_RDMA_READ),
72 [IB_WR_ATOMIC_CMP_AND_SWP] = __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
73 [IB_WR_ATOMIC_FETCH_AND_ADD] = __constant_cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
74 };
75
76 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
77 {
78 return container_of(mqp, struct mlx4_ib_sqp, qp);
79 }
80
81 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
82 {
83 return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
84 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3;
85 }
86
87 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
88 {
89 return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
90 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1;
91 }
92
93 static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
94 {
95 if (qp->buf.nbufs == 1)
96 return qp->buf.u.direct.buf + offset;
97 else
98 return qp->buf.u.page_list[offset >> PAGE_SHIFT].buf +
99 (offset & (PAGE_SIZE - 1));
100 }
101
102 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
103 {
104 return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
105 }
106
107 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
108 {
109 return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
110 }
111
112 /*
113 * Stamp a SQ WQE so that it is invalid if prefetched by marking the
114 * first four bytes of every 64 byte chunk with 0xffffffff, except for
115 * the very first chunk of the WQE.
116 */
117 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n)
118 {
119 u32 *wqe = get_send_wqe(qp, n);
120 int i;
121
122 for (i = 16; i < 1 << (qp->sq.wqe_shift - 2); i += 16)
123 wqe[i] = 0xffffffff;
124 }
125
126 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
127 {
128 struct ib_event event;
129 struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;
130
131 if (type == MLX4_EVENT_TYPE_PATH_MIG)
132 to_mibqp(qp)->port = to_mibqp(qp)->alt_port;
133
134 if (ibqp->event_handler) {
135 event.device = ibqp->device;
136 event.element.qp = ibqp;
137 switch (type) {
138 case MLX4_EVENT_TYPE_PATH_MIG:
139 event.event = IB_EVENT_PATH_MIG;
140 break;
141 case MLX4_EVENT_TYPE_COMM_EST:
142 event.event = IB_EVENT_COMM_EST;
143 break;
144 case MLX4_EVENT_TYPE_SQ_DRAINED:
145 event.event = IB_EVENT_SQ_DRAINED;
146 break;
147 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
148 event.event = IB_EVENT_QP_LAST_WQE_REACHED;
149 break;
150 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
151 event.event = IB_EVENT_QP_FATAL;
152 break;
153 case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
154 event.event = IB_EVENT_PATH_MIG_ERR;
155 break;
156 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
157 event.event = IB_EVENT_QP_REQ_ERR;
158 break;
159 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
160 event.event = IB_EVENT_QP_ACCESS_ERR;
161 break;
162 default:
163 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
164 "on QP %06x\n", type, qp->qpn);
165 return;
166 }
167
168 ibqp->event_handler(&event, ibqp->qp_context);
169 }
170 }
171
172 static int send_wqe_overhead(enum ib_qp_type type)
173 {
174 /*
175 * UD WQEs must have a datagram segment.
176 * RC and UC WQEs might have a remote address segment.
177 * MLX WQEs need two extra inline data segments (for the UD
178 * header and space for the ICRC).
179 */
180 switch (type) {
181 case IB_QPT_UD:
182 return sizeof (struct mlx4_wqe_ctrl_seg) +
183 sizeof (struct mlx4_wqe_datagram_seg);
184 case IB_QPT_UC:
185 return sizeof (struct mlx4_wqe_ctrl_seg) +
186 sizeof (struct mlx4_wqe_raddr_seg);
187 case IB_QPT_RC:
188 return sizeof (struct mlx4_wqe_ctrl_seg) +
189 sizeof (struct mlx4_wqe_atomic_seg) +
190 sizeof (struct mlx4_wqe_raddr_seg);
191 case IB_QPT_SMI:
192 case IB_QPT_GSI:
193 return sizeof (struct mlx4_wqe_ctrl_seg) +
194 ALIGN(MLX4_IB_UD_HEADER_SIZE +
195 DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE,
196 MLX4_INLINE_ALIGN) *
197 sizeof (struct mlx4_wqe_inline_seg),
198 sizeof (struct mlx4_wqe_data_seg)) +
199 ALIGN(4 +
200 sizeof (struct mlx4_wqe_inline_seg),
201 sizeof (struct mlx4_wqe_data_seg));
202 default:
203 return sizeof (struct mlx4_wqe_ctrl_seg);
204 }
205 }
206
207 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
208 int is_user, int has_srq, struct mlx4_ib_qp *qp)
209 {
210 /* Sanity check RQ size before proceeding */
211 if (cap->max_recv_wr > dev->dev->caps.max_wqes ||
212 cap->max_recv_sge > dev->dev->caps.max_rq_sg)
213 return -EINVAL;
214
215 if (has_srq) {
216 /* QPs attached to an SRQ should have no RQ */
217 if (cap->max_recv_wr)
218 return -EINVAL;
219
220 qp->rq.wqe_cnt = qp->rq.max_gs = 0;
221 } else {
222 /* HW requires >= 1 RQ entry with >= 1 gather entry */
223 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
224 return -EINVAL;
225
226 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr));
227 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge));
228 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
229 }
230
231 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt;
232 cap->max_recv_sge = qp->rq.max_gs;
233
234 return 0;
235 }
236
237 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
238 enum ib_qp_type type, struct mlx4_ib_qp *qp)
239 {
240 /* Sanity check SQ size before proceeding */
241 if (cap->max_send_wr > dev->dev->caps.max_wqes ||
242 cap->max_send_sge > dev->dev->caps.max_sq_sg ||
243 cap->max_inline_data + send_wqe_overhead(type) +
244 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
245 return -EINVAL;
246
247 /*
248 * For MLX transport we need 2 extra S/G entries:
249 * one for the header and one for the checksum at the end
250 */
251 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
252 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
253 return -EINVAL;
254
255 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(max(cap->max_send_sge *
256 sizeof (struct mlx4_wqe_data_seg),
257 cap->max_inline_data +
258 sizeof (struct mlx4_wqe_inline_seg)) +
259 send_wqe_overhead(type)));
260 qp->sq.max_gs = ((1 << qp->sq.wqe_shift) - send_wqe_overhead(type)) /
261 sizeof (struct mlx4_wqe_data_seg);
262
263 /*
264 * We need to leave 2 KB + 1 WQE of headroom in the SQ to
265 * allow HW to prefetch.
266 */
267 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + 1;
268 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr + qp->sq_spare_wqes);
269
270 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
271 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
272 if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
273 qp->rq.offset = 0;
274 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
275 } else {
276 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
277 qp->sq.offset = 0;
278 }
279
280 cap->max_send_wr = qp->sq.max_post = qp->sq.wqe_cnt - qp->sq_spare_wqes;
281 cap->max_send_sge = qp->sq.max_gs;
282 /* We don't support inline sends for kernel QPs (yet) */
283 cap->max_inline_data = 0;
284
285 return 0;
286 }
287
288 static int set_user_sq_size(struct mlx4_ib_qp *qp,
289 struct mlx4_ib_create_qp *ucmd)
290 {
291 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count;
292 qp->sq.wqe_shift = ucmd->log_sq_stride;
293
294 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
295 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
296
297 return 0;
298 }
299
300 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
301 struct ib_qp_init_attr *init_attr,
302 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
303 {
304 int err;
305
306 mutex_init(&qp->mutex);
307 spin_lock_init(&qp->sq.lock);
308 spin_lock_init(&qp->rq.lock);
309
310 qp->state = IB_QPS_RESET;
311 qp->atomic_rd_en = 0;
312 qp->resp_depth = 0;
313
314 qp->rq.head = 0;
315 qp->rq.tail = 0;
316 qp->sq.head = 0;
317 qp->sq.tail = 0;
318
319 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp);
320 if (err)
321 goto err;
322
323 if (pd->uobject) {
324 struct mlx4_ib_create_qp ucmd;
325
326 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
327 err = -EFAULT;
328 goto err;
329 }
330
331 qp->sq_no_prefetch = ucmd.sq_no_prefetch;
332
333 err = set_user_sq_size(qp, &ucmd);
334 if (err)
335 goto err;
336
337 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
338 qp->buf_size, 0);
339 if (IS_ERR(qp->umem)) {
340 err = PTR_ERR(qp->umem);
341 goto err;
342 }
343
344 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
345 ilog2(qp->umem->page_size), &qp->mtt);
346 if (err)
347 goto err_buf;
348
349 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
350 if (err)
351 goto err_mtt;
352
353 if (!init_attr->srq) {
354 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
355 ucmd.db_addr, &qp->db);
356 if (err)
357 goto err_mtt;
358 }
359 } else {
360 qp->sq_no_prefetch = 0;
361
362 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
363 if (err)
364 goto err;
365
366 if (!init_attr->srq) {
367 err = mlx4_ib_db_alloc(dev, &qp->db, 0);
368 if (err)
369 goto err;
370
371 *qp->db.db = 0;
372 }
373
374 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
375 err = -ENOMEM;
376 goto err_db;
377 }
378
379 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
380 &qp->mtt);
381 if (err)
382 goto err_buf;
383
384 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
385 if (err)
386 goto err_mtt;
387
388 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
389 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
390
391 if (!qp->sq.wrid || !qp->rq.wrid) {
392 err = -ENOMEM;
393 goto err_wrid;
394 }
395 }
396
397 err = mlx4_qp_alloc(dev->dev, sqpn, &qp->mqp);
398 if (err)
399 goto err_wrid;
400
401 /*
402 * Hardware wants QPN written in big-endian order (after
403 * shifting) for send doorbell. Precompute this value to save
404 * a little bit when posting sends.
405 */
406 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
407
408 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
409 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
410 else
411 qp->sq_signal_bits = 0;
412
413 qp->mqp.event = mlx4_ib_qp_event;
414
415 return 0;
416
417 err_wrid:
418 if (pd->uobject && !init_attr->srq)
419 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &qp->db);
420 else {
421 kfree(qp->sq.wrid);
422 kfree(qp->rq.wrid);
423 }
424
425 err_mtt:
426 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
427
428 err_buf:
429 if (pd->uobject)
430 ib_umem_release(qp->umem);
431 else
432 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
433
434 err_db:
435 if (!pd->uobject && !init_attr->srq)
436 mlx4_ib_db_free(dev, &qp->db);
437
438 err:
439 return err;
440 }
441
442 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
443 {
444 switch (state) {
445 case IB_QPS_RESET: return MLX4_QP_STATE_RST;
446 case IB_QPS_INIT: return MLX4_QP_STATE_INIT;
447 case IB_QPS_RTR: return MLX4_QP_STATE_RTR;
448 case IB_QPS_RTS: return MLX4_QP_STATE_RTS;
449 case IB_QPS_SQD: return MLX4_QP_STATE_SQD;
450 case IB_QPS_SQE: return MLX4_QP_STATE_SQER;
451 case IB_QPS_ERR: return MLX4_QP_STATE_ERR;
452 default: return -1;
453 }
454 }
455
456 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
457 {
458 if (send_cq == recv_cq)
459 spin_lock_irq(&send_cq->lock);
460 else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
461 spin_lock_irq(&send_cq->lock);
462 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
463 } else {
464 spin_lock_irq(&recv_cq->lock);
465 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
466 }
467 }
468
469 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
470 {
471 if (send_cq == recv_cq)
472 spin_unlock_irq(&send_cq->lock);
473 else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
474 spin_unlock(&recv_cq->lock);
475 spin_unlock_irq(&send_cq->lock);
476 } else {
477 spin_unlock(&send_cq->lock);
478 spin_unlock_irq(&recv_cq->lock);
479 }
480 }
481
482 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
483 int is_user)
484 {
485 struct mlx4_ib_cq *send_cq, *recv_cq;
486
487 if (qp->state != IB_QPS_RESET)
488 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
489 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
490 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
491 qp->mqp.qpn);
492
493 send_cq = to_mcq(qp->ibqp.send_cq);
494 recv_cq = to_mcq(qp->ibqp.recv_cq);
495
496 mlx4_ib_lock_cqs(send_cq, recv_cq);
497
498 if (!is_user) {
499 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
500 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
501 if (send_cq != recv_cq)
502 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
503 }
504
505 mlx4_qp_remove(dev->dev, &qp->mqp);
506
507 mlx4_ib_unlock_cqs(send_cq, recv_cq);
508
509 mlx4_qp_free(dev->dev, &qp->mqp);
510 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
511
512 if (is_user) {
513 if (!qp->ibqp.srq)
514 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
515 &qp->db);
516 ib_umem_release(qp->umem);
517 } else {
518 kfree(qp->sq.wrid);
519 kfree(qp->rq.wrid);
520 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
521 if (!qp->ibqp.srq)
522 mlx4_ib_db_free(dev, &qp->db);
523 }
524 }
525
526 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
527 struct ib_qp_init_attr *init_attr,
528 struct ib_udata *udata)
529 {
530 struct mlx4_ib_dev *dev = to_mdev(pd->device);
531 struct mlx4_ib_sqp *sqp;
532 struct mlx4_ib_qp *qp;
533 int err;
534
535 switch (init_attr->qp_type) {
536 case IB_QPT_RC:
537 case IB_QPT_UC:
538 case IB_QPT_UD:
539 {
540 qp = kmalloc(sizeof *qp, GFP_KERNEL);
541 if (!qp)
542 return ERR_PTR(-ENOMEM);
543
544 err = create_qp_common(dev, pd, init_attr, udata, 0, qp);
545 if (err) {
546 kfree(qp);
547 return ERR_PTR(err);
548 }
549
550 qp->ibqp.qp_num = qp->mqp.qpn;
551
552 break;
553 }
554 case IB_QPT_SMI:
555 case IB_QPT_GSI:
556 {
557 /* Userspace is not allowed to create special QPs: */
558 if (pd->uobject)
559 return ERR_PTR(-EINVAL);
560
561 sqp = kmalloc(sizeof *sqp, GFP_KERNEL);
562 if (!sqp)
563 return ERR_PTR(-ENOMEM);
564
565 qp = &sqp->qp;
566
567 err = create_qp_common(dev, pd, init_attr, udata,
568 dev->dev->caps.sqp_start +
569 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
570 init_attr->port_num - 1,
571 qp);
572 if (err) {
573 kfree(sqp);
574 return ERR_PTR(err);
575 }
576
577 qp->port = init_attr->port_num;
578 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
579
580 break;
581 }
582 default:
583 /* Don't support raw QPs */
584 return ERR_PTR(-EINVAL);
585 }
586
587 return &qp->ibqp;
588 }
589
590 int mlx4_ib_destroy_qp(struct ib_qp *qp)
591 {
592 struct mlx4_ib_dev *dev = to_mdev(qp->device);
593 struct mlx4_ib_qp *mqp = to_mqp(qp);
594
595 if (is_qp0(dev, mqp))
596 mlx4_CLOSE_PORT(dev->dev, mqp->port);
597
598 destroy_qp_common(dev, mqp, !!qp->pd->uobject);
599
600 if (is_sqp(dev, mqp))
601 kfree(to_msqp(mqp));
602 else
603 kfree(mqp);
604
605 return 0;
606 }
607
608 static int to_mlx4_st(enum ib_qp_type type)
609 {
610 switch (type) {
611 case IB_QPT_RC: return MLX4_QP_ST_RC;
612 case IB_QPT_UC: return MLX4_QP_ST_UC;
613 case IB_QPT_UD: return MLX4_QP_ST_UD;
614 case IB_QPT_SMI:
615 case IB_QPT_GSI: return MLX4_QP_ST_MLX;
616 default: return -1;
617 }
618 }
619
620 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
621 int attr_mask)
622 {
623 u8 dest_rd_atomic;
624 u32 access_flags;
625 u32 hw_access_flags = 0;
626
627 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
628 dest_rd_atomic = attr->max_dest_rd_atomic;
629 else
630 dest_rd_atomic = qp->resp_depth;
631
632 if (attr_mask & IB_QP_ACCESS_FLAGS)
633 access_flags = attr->qp_access_flags;
634 else
635 access_flags = qp->atomic_rd_en;
636
637 if (!dest_rd_atomic)
638 access_flags &= IB_ACCESS_REMOTE_WRITE;
639
640 if (access_flags & IB_ACCESS_REMOTE_READ)
641 hw_access_flags |= MLX4_QP_BIT_RRE;
642 if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
643 hw_access_flags |= MLX4_QP_BIT_RAE;
644 if (access_flags & IB_ACCESS_REMOTE_WRITE)
645 hw_access_flags |= MLX4_QP_BIT_RWE;
646
647 return cpu_to_be32(hw_access_flags);
648 }
649
650 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
651 int attr_mask)
652 {
653 if (attr_mask & IB_QP_PKEY_INDEX)
654 sqp->pkey_index = attr->pkey_index;
655 if (attr_mask & IB_QP_QKEY)
656 sqp->qkey = attr->qkey;
657 if (attr_mask & IB_QP_SQ_PSN)
658 sqp->send_psn = attr->sq_psn;
659 }
660
661 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
662 {
663 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
664 }
665
666 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
667 struct mlx4_qp_path *path, u8 port)
668 {
669 path->grh_mylmc = ah->src_path_bits & 0x7f;
670 path->rlid = cpu_to_be16(ah->dlid);
671 if (ah->static_rate) {
672 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
673 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
674 !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
675 --path->static_rate;
676 } else
677 path->static_rate = 0;
678 path->counter_index = 0xff;
679
680 if (ah->ah_flags & IB_AH_GRH) {
681 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
682 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
683 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
684 return -1;
685 }
686
687 path->grh_mylmc |= 1 << 7;
688 path->mgid_index = ah->grh.sgid_index;
689 path->hop_limit = ah->grh.hop_limit;
690 path->tclass_flowlabel =
691 cpu_to_be32((ah->grh.traffic_class << 20) |
692 (ah->grh.flow_label));
693 memcpy(path->rgid, ah->grh.dgid.raw, 16);
694 }
695
696 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
697 ((port - 1) << 6) | ((ah->sl & 0xf) << 2);
698
699 return 0;
700 }
701
702 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
703 const struct ib_qp_attr *attr, int attr_mask,
704 enum ib_qp_state cur_state, enum ib_qp_state new_state)
705 {
706 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
707 struct mlx4_ib_qp *qp = to_mqp(ibqp);
708 struct mlx4_qp_context *context;
709 enum mlx4_qp_optpar optpar = 0;
710 int sqd_event;
711 int err = -EINVAL;
712
713 context = kzalloc(sizeof *context, GFP_KERNEL);
714 if (!context)
715 return -ENOMEM;
716
717 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
718 (to_mlx4_st(ibqp->qp_type) << 16));
719 context->flags |= cpu_to_be32(1 << 8); /* DE? */
720
721 if (!(attr_mask & IB_QP_PATH_MIG_STATE))
722 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
723 else {
724 optpar |= MLX4_QP_OPTPAR_PM_STATE;
725 switch (attr->path_mig_state) {
726 case IB_MIG_MIGRATED:
727 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
728 break;
729 case IB_MIG_REARM:
730 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
731 break;
732 case IB_MIG_ARMED:
733 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
734 break;
735 }
736 }
737
738 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
739 ibqp->qp_type == IB_QPT_UD)
740 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
741 else if (attr_mask & IB_QP_PATH_MTU) {
742 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
743 printk(KERN_ERR "path MTU (%u) is invalid\n",
744 attr->path_mtu);
745 return -EINVAL;
746 }
747 context->mtu_msgmax = (attr->path_mtu << 5) | 31;
748 }
749
750 if (qp->rq.wqe_cnt)
751 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
752 context->rq_size_stride |= qp->rq.wqe_shift - 4;
753
754 if (qp->sq.wqe_cnt)
755 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
756 context->sq_size_stride |= qp->sq.wqe_shift - 4;
757
758 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
759 context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
760
761 if (qp->ibqp.uobject)
762 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
763 else
764 context->usr_page = cpu_to_be32(dev->priv_uar.index);
765
766 if (attr_mask & IB_QP_DEST_QPN)
767 context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
768
769 if (attr_mask & IB_QP_PORT) {
770 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
771 !(attr_mask & IB_QP_AV)) {
772 mlx4_set_sched(&context->pri_path, attr->port_num);
773 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
774 }
775 }
776
777 if (attr_mask & IB_QP_PKEY_INDEX) {
778 context->pri_path.pkey_index = attr->pkey_index;
779 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
780 }
781
782 if (attr_mask & IB_QP_AV) {
783 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
784 attr_mask & IB_QP_PORT ? attr->port_num : qp->port)) {
785 err = -EINVAL;
786 goto out;
787 }
788
789 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
790 MLX4_QP_OPTPAR_SCHED_QUEUE);
791 }
792
793 if (attr_mask & IB_QP_TIMEOUT) {
794 context->pri_path.ackto = attr->timeout << 3;
795 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
796 }
797
798 if (attr_mask & IB_QP_ALT_PATH) {
799 if (attr->alt_port_num == 0 ||
800 attr->alt_port_num > dev->dev->caps.num_ports)
801 return -EINVAL;
802
803 if (attr->alt_pkey_index >=
804 dev->dev->caps.pkey_table_len[attr->alt_port_num])
805 return -EINVAL;
806
807 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
808 attr->alt_port_num))
809 return -EINVAL;
810
811 context->alt_path.pkey_index = attr->alt_pkey_index;
812 context->alt_path.ackto = attr->alt_timeout << 3;
813 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
814 }
815
816 context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn);
817 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
818
819 if (attr_mask & IB_QP_RNR_RETRY) {
820 context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
821 optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
822 }
823
824 if (attr_mask & IB_QP_RETRY_CNT) {
825 context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
826 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
827 }
828
829 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
830 if (attr->max_rd_atomic)
831 context->params1 |=
832 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
833 optpar |= MLX4_QP_OPTPAR_SRA_MAX;
834 }
835
836 if (attr_mask & IB_QP_SQ_PSN)
837 context->next_send_psn = cpu_to_be32(attr->sq_psn);
838
839 context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn);
840
841 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
842 if (attr->max_dest_rd_atomic)
843 context->params2 |=
844 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
845 optpar |= MLX4_QP_OPTPAR_RRA_MAX;
846 }
847
848 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
849 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
850 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
851 }
852
853 if (ibqp->srq)
854 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
855
856 if (attr_mask & IB_QP_MIN_RNR_TIMER) {
857 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
858 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
859 }
860 if (attr_mask & IB_QP_RQ_PSN)
861 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
862
863 context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn);
864
865 if (attr_mask & IB_QP_QKEY) {
866 context->qkey = cpu_to_be32(attr->qkey);
867 optpar |= MLX4_QP_OPTPAR_Q_KEY;
868 }
869
870 if (ibqp->srq)
871 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
872
873 if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
874 context->db_rec_addr = cpu_to_be64(qp->db.dma);
875
876 if (cur_state == IB_QPS_INIT &&
877 new_state == IB_QPS_RTR &&
878 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
879 ibqp->qp_type == IB_QPT_UD)) {
880 context->pri_path.sched_queue = (qp->port - 1) << 6;
881 if (is_qp0(dev, qp))
882 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
883 else
884 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
885 }
886
887 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD &&
888 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
889 sqd_event = 1;
890 else
891 sqd_event = 0;
892
893 /*
894 * Before passing a kernel QP to the HW, make sure that the
895 * ownership bits of the send queue are set and the SQ
896 * headroom is stamped so that the hardware doesn't start
897 * processing stale work requests.
898 */
899 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
900 struct mlx4_wqe_ctrl_seg *ctrl;
901 int i;
902
903 for (i = 0; i < qp->sq.wqe_cnt; ++i) {
904 ctrl = get_send_wqe(qp, i);
905 ctrl->owner_opcode = cpu_to_be32(1 << 31);
906
907 stamp_send_wqe(qp, i);
908 }
909 }
910
911 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
912 to_mlx4_state(new_state), context, optpar,
913 sqd_event, &qp->mqp);
914 if (err)
915 goto out;
916
917 qp->state = new_state;
918
919 if (attr_mask & IB_QP_ACCESS_FLAGS)
920 qp->atomic_rd_en = attr->qp_access_flags;
921 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
922 qp->resp_depth = attr->max_dest_rd_atomic;
923 if (attr_mask & IB_QP_PORT)
924 qp->port = attr->port_num;
925 if (attr_mask & IB_QP_ALT_PATH)
926 qp->alt_port = attr->alt_port_num;
927
928 if (is_sqp(dev, qp))
929 store_sqp_attrs(to_msqp(qp), attr, attr_mask);
930
931 /*
932 * If we moved QP0 to RTR, bring the IB link up; if we moved
933 * QP0 to RESET or ERROR, bring the link back down.
934 */
935 if (is_qp0(dev, qp)) {
936 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
937 if (mlx4_INIT_PORT(dev->dev, qp->port))
938 printk(KERN_WARNING "INIT_PORT failed for port %d\n",
939 qp->port);
940
941 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
942 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
943 mlx4_CLOSE_PORT(dev->dev, qp->port);
944 }
945
946 /*
947 * If we moved a kernel QP to RESET, clean up all old CQ
948 * entries and reinitialize the QP.
949 */
950 if (new_state == IB_QPS_RESET && !ibqp->uobject) {
951 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn,
952 ibqp->srq ? to_msrq(ibqp->srq): NULL);
953 if (ibqp->send_cq != ibqp->recv_cq)
954 mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL);
955
956 qp->rq.head = 0;
957 qp->rq.tail = 0;
958 qp->sq.head = 0;
959 qp->sq.tail = 0;
960 if (!ibqp->srq)
961 *qp->db.db = 0;
962 }
963
964 out:
965 kfree(context);
966 return err;
967 }
968
969 static const struct ib_qp_attr mlx4_ib_qp_attr = { .port_num = 1 };
970 static const int mlx4_ib_qp_attr_mask_table[IB_QPT_UD + 1] = {
971 [IB_QPT_UD] = (IB_QP_PKEY_INDEX |
972 IB_QP_PORT |
973 IB_QP_QKEY),
974 [IB_QPT_UC] = (IB_QP_PKEY_INDEX |
975 IB_QP_PORT |
976 IB_QP_ACCESS_FLAGS),
977 [IB_QPT_RC] = (IB_QP_PKEY_INDEX |
978 IB_QP_PORT |
979 IB_QP_ACCESS_FLAGS),
980 [IB_QPT_SMI] = (IB_QP_PKEY_INDEX |
981 IB_QP_QKEY),
982 [IB_QPT_GSI] = (IB_QP_PKEY_INDEX |
983 IB_QP_QKEY),
984 };
985
986 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
987 int attr_mask, struct ib_udata *udata)
988 {
989 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
990 struct mlx4_ib_qp *qp = to_mqp(ibqp);
991 enum ib_qp_state cur_state, new_state;
992 int err = -EINVAL;
993
994 mutex_lock(&qp->mutex);
995
996 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
997 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
998
999 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
1000 goto out;
1001
1002 if ((attr_mask & IB_QP_PORT) &&
1003 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
1004 goto out;
1005 }
1006
1007 if (attr_mask & IB_QP_PKEY_INDEX) {
1008 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
1009 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p])
1010 goto out;
1011 }
1012
1013 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
1014 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
1015 goto out;
1016 }
1017
1018 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
1019 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
1020 goto out;
1021 }
1022
1023 if (cur_state == new_state && cur_state == IB_QPS_RESET) {
1024 err = 0;
1025 goto out;
1026 }
1027
1028 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_ERR) {
1029 err = __mlx4_ib_modify_qp(ibqp, &mlx4_ib_qp_attr,
1030 mlx4_ib_qp_attr_mask_table[ibqp->qp_type],
1031 IB_QPS_RESET, IB_QPS_INIT);
1032 if (err)
1033 goto out;
1034 cur_state = IB_QPS_INIT;
1035 }
1036
1037 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
1038
1039 out:
1040 mutex_unlock(&qp->mutex);
1041 return err;
1042 }
1043
1044 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
1045 void *wqe)
1046 {
1047 struct ib_device *ib_dev = &to_mdev(sqp->qp.ibqp.device)->ib_dev;
1048 struct mlx4_wqe_mlx_seg *mlx = wqe;
1049 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1050 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1051 u16 pkey;
1052 int send_size;
1053 int header_size;
1054 int spc;
1055 int i;
1056
1057 send_size = 0;
1058 for (i = 0; i < wr->num_sge; ++i)
1059 send_size += wr->sg_list[i].length;
1060
1061 ib_ud_header_init(send_size, mlx4_ib_ah_grh_present(ah), &sqp->ud_header);
1062
1063 sqp->ud_header.lrh.service_level =
1064 be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28;
1065 sqp->ud_header.lrh.destination_lid = ah->av.dlid;
1066 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.g_slid & 0x7f);
1067 if (mlx4_ib_ah_grh_present(ah)) {
1068 sqp->ud_header.grh.traffic_class =
1069 (be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20) & 0xff;
1070 sqp->ud_header.grh.flow_label =
1071 ah->av.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
1072 sqp->ud_header.grh.hop_limit = ah->av.hop_limit;
1073 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.port_pd) >> 24,
1074 ah->av.gid_index, &sqp->ud_header.grh.source_gid);
1075 memcpy(sqp->ud_header.grh.destination_gid.raw,
1076 ah->av.dgid, 16);
1077 }
1078
1079 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1080 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
1081 (sqp->ud_header.lrh.destination_lid ==
1082 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
1083 (sqp->ud_header.lrh.service_level << 8));
1084 mlx->rlid = sqp->ud_header.lrh.destination_lid;
1085
1086 switch (wr->opcode) {
1087 case IB_WR_SEND:
1088 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1089 sqp->ud_header.immediate_present = 0;
1090 break;
1091 case IB_WR_SEND_WITH_IMM:
1092 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1093 sqp->ud_header.immediate_present = 1;
1094 sqp->ud_header.immediate_data = wr->imm_data;
1095 break;
1096 default:
1097 return -EINVAL;
1098 }
1099
1100 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0;
1101 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1102 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1103 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1104 if (!sqp->qp.ibqp.qp_num)
1105 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
1106 else
1107 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
1108 sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1109 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1110 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1111 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1112 sqp->qkey : wr->wr.ud.remote_qkey);
1113 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1114
1115 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1116
1117 if (0) {
1118 printk(KERN_ERR "built UD header of size %d:\n", header_size);
1119 for (i = 0; i < header_size / 4; ++i) {
1120 if (i % 8 == 0)
1121 printk(" [%02x] ", i * 4);
1122 printk(" %08x",
1123 be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
1124 if ((i + 1) % 8 == 0)
1125 printk("\n");
1126 }
1127 printk("\n");
1128 }
1129
1130 /*
1131 * Inline data segments may not cross a 64 byte boundary. If
1132 * our UD header is bigger than the space available up to the
1133 * next 64 byte boundary in the WQE, use two inline data
1134 * segments to hold the UD header.
1135 */
1136 spc = MLX4_INLINE_ALIGN -
1137 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1138 if (header_size <= spc) {
1139 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1140 memcpy(inl + 1, sqp->header_buf, header_size);
1141 i = 1;
1142 } else {
1143 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1144 memcpy(inl + 1, sqp->header_buf, spc);
1145
1146 inl = (void *) (inl + 1) + spc;
1147 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1148 /*
1149 * Need a barrier here to make sure all the data is
1150 * visible before the byte_count field is set.
1151 * Otherwise the HCA prefetcher could grab the 64-byte
1152 * chunk with this inline segment and get a valid (!=
1153 * 0xffffffff) byte count but stale data, and end up
1154 * generating a packet with bad headers.
1155 *
1156 * The first inline segment's byte_count field doesn't
1157 * need a barrier, because it comes after a
1158 * control/MLX segment and therefore is at an offset
1159 * of 16 mod 64.
1160 */
1161 wmb();
1162 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1163 i = 2;
1164 }
1165
1166 return ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1167 }
1168
1169 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
1170 {
1171 unsigned cur;
1172 struct mlx4_ib_cq *cq;
1173
1174 cur = wq->head - wq->tail;
1175 if (likely(cur + nreq < wq->max_post))
1176 return 0;
1177
1178 cq = to_mcq(ib_cq);
1179 spin_lock(&cq->lock);
1180 cur = wq->head - wq->tail;
1181 spin_unlock(&cq->lock);
1182
1183 return cur + nreq >= wq->max_post;
1184 }
1185
1186 static void set_data_seg(struct mlx4_wqe_data_seg *dseg,
1187 struct ib_sge *sg)
1188 {
1189 dseg->byte_count = cpu_to_be32(sg->length);
1190 dseg->lkey = cpu_to_be32(sg->lkey);
1191 dseg->addr = cpu_to_be64(sg->addr);
1192 }
1193
1194 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1195 struct ib_send_wr **bad_wr)
1196 {
1197 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1198 void *wqe;
1199 struct mlx4_wqe_ctrl_seg *ctrl;
1200 unsigned long flags;
1201 int nreq;
1202 int err = 0;
1203 int ind;
1204 int size;
1205 int i;
1206
1207 spin_lock_irqsave(&qp->rq.lock, flags);
1208
1209 ind = qp->sq.head;
1210
1211 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1212 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1213 err = -ENOMEM;
1214 *bad_wr = wr;
1215 goto out;
1216 }
1217
1218 if (unlikely(wr->num_sge > qp->sq.max_gs)) {
1219 err = -EINVAL;
1220 *bad_wr = wr;
1221 goto out;
1222 }
1223
1224 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
1225 qp->sq.wrid[ind & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
1226
1227 ctrl->srcrb_flags =
1228 (wr->send_flags & IB_SEND_SIGNALED ?
1229 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
1230 (wr->send_flags & IB_SEND_SOLICITED ?
1231 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
1232 qp->sq_signal_bits;
1233
1234 if (wr->opcode == IB_WR_SEND_WITH_IMM ||
1235 wr->opcode == IB_WR_RDMA_WRITE_WITH_IMM)
1236 ctrl->imm = wr->imm_data;
1237 else
1238 ctrl->imm = 0;
1239
1240 wqe += sizeof *ctrl;
1241 size = sizeof *ctrl / 16;
1242
1243 switch (ibqp->qp_type) {
1244 case IB_QPT_RC:
1245 case IB_QPT_UC:
1246 switch (wr->opcode) {
1247 case IB_WR_ATOMIC_CMP_AND_SWP:
1248 case IB_WR_ATOMIC_FETCH_AND_ADD:
1249 ((struct mlx4_wqe_raddr_seg *) wqe)->raddr =
1250 cpu_to_be64(wr->wr.atomic.remote_addr);
1251 ((struct mlx4_wqe_raddr_seg *) wqe)->rkey =
1252 cpu_to_be32(wr->wr.atomic.rkey);
1253 ((struct mlx4_wqe_raddr_seg *) wqe)->reserved = 0;
1254
1255 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1256
1257 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1258 ((struct mlx4_wqe_atomic_seg *) wqe)->swap_add =
1259 cpu_to_be64(wr->wr.atomic.swap);
1260 ((struct mlx4_wqe_atomic_seg *) wqe)->compare =
1261 cpu_to_be64(wr->wr.atomic.compare_add);
1262 } else {
1263 ((struct mlx4_wqe_atomic_seg *) wqe)->swap_add =
1264 cpu_to_be64(wr->wr.atomic.compare_add);
1265 ((struct mlx4_wqe_atomic_seg *) wqe)->compare = 0;
1266 }
1267
1268 wqe += sizeof (struct mlx4_wqe_atomic_seg);
1269 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1270 sizeof (struct mlx4_wqe_atomic_seg)) / 16;
1271
1272 break;
1273
1274 case IB_WR_RDMA_READ:
1275 case IB_WR_RDMA_WRITE:
1276 case IB_WR_RDMA_WRITE_WITH_IMM:
1277 ((struct mlx4_wqe_raddr_seg *) wqe)->raddr =
1278 cpu_to_be64(wr->wr.rdma.remote_addr);
1279 ((struct mlx4_wqe_raddr_seg *) wqe)->rkey =
1280 cpu_to_be32(wr->wr.rdma.rkey);
1281 ((struct mlx4_wqe_raddr_seg *) wqe)->reserved = 0;
1282
1283 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1284 size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
1285
1286 break;
1287
1288 default:
1289 /* No extra segments required for sends */
1290 break;
1291 }
1292 break;
1293
1294 case IB_QPT_UD:
1295 memcpy(((struct mlx4_wqe_datagram_seg *) wqe)->av,
1296 &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
1297 ((struct mlx4_wqe_datagram_seg *) wqe)->dqpn =
1298 cpu_to_be32(wr->wr.ud.remote_qpn);
1299 ((struct mlx4_wqe_datagram_seg *) wqe)->qkey =
1300 cpu_to_be32(wr->wr.ud.remote_qkey);
1301
1302 wqe += sizeof (struct mlx4_wqe_datagram_seg);
1303 size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
1304 break;
1305
1306 case IB_QPT_SMI:
1307 case IB_QPT_GSI:
1308 err = build_mlx_header(to_msqp(qp), wr, ctrl);
1309 if (err < 0) {
1310 *bad_wr = wr;
1311 goto out;
1312 }
1313 wqe += err;
1314 size += err / 16;
1315
1316 err = 0;
1317 break;
1318
1319 default:
1320 break;
1321 }
1322
1323 for (i = 0; i < wr->num_sge; ++i) {
1324 set_data_seg(wqe, wr->sg_list + i);
1325
1326 wqe += sizeof (struct mlx4_wqe_data_seg);
1327 size += sizeof (struct mlx4_wqe_data_seg) / 16;
1328 }
1329
1330 /* Add one more inline data segment for ICRC for MLX sends */
1331 if (qp->ibqp.qp_type == IB_QPT_SMI || qp->ibqp.qp_type == IB_QPT_GSI) {
1332 ((struct mlx4_wqe_inline_seg *) wqe)->byte_count =
1333 cpu_to_be32((1 << 31) | 4);
1334 ((u32 *) wqe)[1] = 0;
1335 wqe += sizeof (struct mlx4_wqe_data_seg);
1336 size += sizeof (struct mlx4_wqe_data_seg) / 16;
1337 }
1338
1339 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
1340 MLX4_WQE_CTRL_FENCE : 0) | size;
1341
1342 /*
1343 * Make sure descriptor is fully written before
1344 * setting ownership bit (because HW can start
1345 * executing as soon as we do).
1346 */
1347 wmb();
1348
1349 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
1350 err = -EINVAL;
1351 goto out;
1352 }
1353
1354 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
1355 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);
1356
1357 /*
1358 * We can improve latency by not stamping the last
1359 * send queue WQE until after ringing the doorbell, so
1360 * only stamp here if there are still more WQEs to post.
1361 */
1362 if (wr->next)
1363 stamp_send_wqe(qp, (ind + qp->sq_spare_wqes) &
1364 (qp->sq.wqe_cnt - 1));
1365
1366 ++ind;
1367 }
1368
1369 out:
1370 if (likely(nreq)) {
1371 qp->sq.head += nreq;
1372
1373 /*
1374 * Make sure that descriptors are written before
1375 * doorbell record.
1376 */
1377 wmb();
1378
1379 writel(qp->doorbell_qpn,
1380 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
1381
1382 /*
1383 * Make sure doorbells don't leak out of SQ spinlock
1384 * and reach the HCA out of order.
1385 */
1386 mmiowb();
1387
1388 stamp_send_wqe(qp, (ind + qp->sq_spare_wqes - 1) &
1389 (qp->sq.wqe_cnt - 1));
1390 }
1391
1392 spin_unlock_irqrestore(&qp->rq.lock, flags);
1393
1394 return err;
1395 }
1396
1397 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1398 struct ib_recv_wr **bad_wr)
1399 {
1400 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1401 struct mlx4_wqe_data_seg *scat;
1402 unsigned long flags;
1403 int err = 0;
1404 int nreq;
1405 int ind;
1406 int i;
1407
1408 spin_lock_irqsave(&qp->rq.lock, flags);
1409
1410 ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
1411
1412 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1413 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.send_cq)) {
1414 err = -ENOMEM;
1415 *bad_wr = wr;
1416 goto out;
1417 }
1418
1419 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1420 err = -EINVAL;
1421 *bad_wr = wr;
1422 goto out;
1423 }
1424
1425 scat = get_recv_wqe(qp, ind);
1426
1427 for (i = 0; i < wr->num_sge; ++i) {
1428 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
1429 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
1430 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
1431 }
1432
1433 if (i < qp->rq.max_gs) {
1434 scat[i].byte_count = 0;
1435 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
1436 scat[i].addr = 0;
1437 }
1438
1439 qp->rq.wrid[ind] = wr->wr_id;
1440
1441 ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
1442 }
1443
1444 out:
1445 if (likely(nreq)) {
1446 qp->rq.head += nreq;
1447
1448 /*
1449 * Make sure that descriptors are written before
1450 * doorbell record.
1451 */
1452 wmb();
1453
1454 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
1455 }
1456
1457 spin_unlock_irqrestore(&qp->rq.lock, flags);
1458
1459 return err;
1460 }
1461
1462 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
1463 {
1464 switch (mlx4_state) {
1465 case MLX4_QP_STATE_RST: return IB_QPS_RESET;
1466 case MLX4_QP_STATE_INIT: return IB_QPS_INIT;
1467 case MLX4_QP_STATE_RTR: return IB_QPS_RTR;
1468 case MLX4_QP_STATE_RTS: return IB_QPS_RTS;
1469 case MLX4_QP_STATE_SQ_DRAINING:
1470 case MLX4_QP_STATE_SQD: return IB_QPS_SQD;
1471 case MLX4_QP_STATE_SQER: return IB_QPS_SQE;
1472 case MLX4_QP_STATE_ERR: return IB_QPS_ERR;
1473 default: return -1;
1474 }
1475 }
1476
1477 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
1478 {
1479 switch (mlx4_mig_state) {
1480 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED;
1481 case MLX4_QP_PM_REARM: return IB_MIG_REARM;
1482 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED;
1483 default: return -1;
1484 }
1485 }
1486
1487 static int to_ib_qp_access_flags(int mlx4_flags)
1488 {
1489 int ib_flags = 0;
1490
1491 if (mlx4_flags & MLX4_QP_BIT_RRE)
1492 ib_flags |= IB_ACCESS_REMOTE_READ;
1493 if (mlx4_flags & MLX4_QP_BIT_RWE)
1494 ib_flags |= IB_ACCESS_REMOTE_WRITE;
1495 if (mlx4_flags & MLX4_QP_BIT_RAE)
1496 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
1497
1498 return ib_flags;
1499 }
1500
1501 static void to_ib_ah_attr(struct mlx4_dev *dev, struct ib_ah_attr *ib_ah_attr,
1502 struct mlx4_qp_path *path)
1503 {
1504 memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
1505 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1;
1506
1507 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
1508 return;
1509
1510 ib_ah_attr->dlid = be16_to_cpu(path->rlid);
1511 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf;
1512 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
1513 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0;
1514 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
1515 if (ib_ah_attr->ah_flags) {
1516 ib_ah_attr->grh.sgid_index = path->mgid_index;
1517 ib_ah_attr->grh.hop_limit = path->hop_limit;
1518 ib_ah_attr->grh.traffic_class =
1519 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
1520 ib_ah_attr->grh.flow_label =
1521 be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
1522 memcpy(ib_ah_attr->grh.dgid.raw,
1523 path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
1524 }
1525 }
1526
1527 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
1528 struct ib_qp_init_attr *qp_init_attr)
1529 {
1530 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1531 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1532 struct mlx4_qp_context context;
1533 int mlx4_state;
1534 int err;
1535
1536 if (qp->state == IB_QPS_RESET) {
1537 qp_attr->qp_state = IB_QPS_RESET;
1538 goto done;
1539 }
1540
1541 err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
1542 if (err)
1543 return -EINVAL;
1544
1545 mlx4_state = be32_to_cpu(context.flags) >> 28;
1546
1547 qp_attr->qp_state = to_ib_qp_state(mlx4_state);
1548 qp_attr->path_mtu = context.mtu_msgmax >> 5;
1549 qp_attr->path_mig_state =
1550 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
1551 qp_attr->qkey = be32_to_cpu(context.qkey);
1552 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
1553 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff;
1554 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff;
1555 qp_attr->qp_access_flags =
1556 to_ib_qp_access_flags(be32_to_cpu(context.params2));
1557
1558 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
1559 to_ib_ah_attr(dev->dev, &qp_attr->ah_attr, &context.pri_path);
1560 to_ib_ah_attr(dev->dev, &qp_attr->alt_ah_attr, &context.alt_path);
1561 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
1562 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num;
1563 }
1564
1565 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
1566 if (qp_attr->qp_state == IB_QPS_INIT)
1567 qp_attr->port_num = qp->port;
1568 else
1569 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;
1570
1571 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
1572 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;
1573
1574 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);
1575
1576 qp_attr->max_dest_rd_atomic =
1577 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
1578 qp_attr->min_rnr_timer =
1579 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
1580 qp_attr->timeout = context.pri_path.ackto >> 3;
1581 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7;
1582 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7;
1583 qp_attr->alt_timeout = context.alt_path.ackto >> 3;
1584
1585 done:
1586 qp_attr->cur_qp_state = qp_attr->qp_state;
1587 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt;
1588 qp_attr->cap.max_recv_sge = qp->rq.max_gs;
1589
1590 if (!ibqp->uobject) {
1591 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt;
1592 qp_attr->cap.max_send_sge = qp->sq.max_gs;
1593 } else {
1594 qp_attr->cap.max_send_wr = 0;
1595 qp_attr->cap.max_send_sge = 0;
1596 }
1597
1598 /*
1599 * We don't support inline sends for kernel QPs (yet), and we
1600 * don't know what userspace's value should be.
1601 */
1602 qp_attr->cap.max_inline_data = 0;
1603
1604 qp_init_attr->cap = qp_attr->cap;
1605
1606 return 0;
1607 }
1608
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