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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / infiniband / hw / mlx4 / qp.c
blob29c81f1ea7a5ff5bdac41634c8c308f4d6bf2595
1 /*
2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
4 *
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
10 *
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
13 * conditions are met:
14 *
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
31 * SOFTWARE.
32 */
33
34 #include <linux/log2.h>
35 #include <linux/slab.h>
36
37 #include <rdma/ib_cache.h>
38 #include <rdma/ib_pack.h>
39
40 #include <linux/mlx4/qp.h>
41
42 #include "mlx4_ib.h"
43 #include "user.h"
44
45 enum {
46 MLX4_IB_ACK_REQ_FREQ = 8,
47 };
48
49 enum {
50 MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83,
51 MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f
52 };
53
54 enum {
55 /*
56 * Largest possible UD header: send with GRH and immediate data.
57 */
58 MLX4_IB_UD_HEADER_SIZE = 72,
59 MLX4_IB_LSO_HEADER_SPARE = 128,
60 };
61
62 struct mlx4_ib_sqp {
63 struct mlx4_ib_qp qp;
64 int pkey_index;
65 u32 qkey;
66 u32 send_psn;
67 struct ib_ud_header ud_header;
68 u8 header_buf[MLX4_IB_UD_HEADER_SIZE];
69 };
70
71 enum {
72 MLX4_IB_MIN_SQ_STRIDE = 6,
73 MLX4_IB_CACHE_LINE_SIZE = 64,
74 };
75
76 static const __be32 mlx4_ib_opcode[] = {
77 [IB_WR_SEND] = cpu_to_be32(MLX4_OPCODE_SEND),
78 [IB_WR_LSO] = cpu_to_be32(MLX4_OPCODE_LSO),
79 [IB_WR_SEND_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_SEND_IMM),
80 [IB_WR_RDMA_WRITE] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
81 [IB_WR_RDMA_WRITE_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
82 [IB_WR_RDMA_READ] = cpu_to_be32(MLX4_OPCODE_RDMA_READ),
83 [IB_WR_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
84 [IB_WR_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
85 [IB_WR_SEND_WITH_INV] = cpu_to_be32(MLX4_OPCODE_SEND_INVAL),
86 [IB_WR_LOCAL_INV] = cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL),
87 [IB_WR_FAST_REG_MR] = cpu_to_be32(MLX4_OPCODE_FMR),
88 [IB_WR_MASKED_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_CS),
89 [IB_WR_MASKED_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_FA),
90 };
91
92 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
93 {
94 return container_of(mqp, struct mlx4_ib_sqp, qp);
95 }
96
97 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
98 {
99 return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
100 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3;
101 }
102
103 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
104 {
105 return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
106 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1;
107 }
108
109 static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
110 {
111 return mlx4_buf_offset(&qp->buf, offset);
112 }
113
114 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
115 {
116 return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
117 }
118
119 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
120 {
121 return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
122 }
123
124 /*
125 * Stamp a SQ WQE so that it is invalid if prefetched by marking the
126 * first four bytes of every 64 byte chunk with
127 * 0x7FFFFFF | (invalid_ownership_value << 31).
128 *
129 * When the max work request size is less than or equal to the WQE
130 * basic block size, as an optimization, we can stamp all WQEs with
131 * 0xffffffff, and skip the very first chunk of each WQE.
132 */
133 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size)
134 {
135 __be32 *wqe;
136 int i;
137 int s;
138 int ind;
139 void *buf;
140 __be32 stamp;
141 struct mlx4_wqe_ctrl_seg *ctrl;
142
143 if (qp->sq_max_wqes_per_wr > 1) {
144 s = roundup(size, 1U << qp->sq.wqe_shift);
145 for (i = 0; i < s; i += 64) {
146 ind = (i >> qp->sq.wqe_shift) + n;
147 stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) :
148 cpu_to_be32(0xffffffff);
149 buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
150 wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1));
151 *wqe = stamp;
152 }
153 } else {
154 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
155 s = (ctrl->fence_size & 0x3f) << 4;
156 for (i = 64; i < s; i += 64) {
157 wqe = buf + i;
158 *wqe = cpu_to_be32(0xffffffff);
159 }
160 }
161 }
162
163 static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size)
164 {
165 struct mlx4_wqe_ctrl_seg *ctrl;
166 struct mlx4_wqe_inline_seg *inl;
167 void *wqe;
168 int s;
169
170 ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
171 s = sizeof(struct mlx4_wqe_ctrl_seg);
172
173 if (qp->ibqp.qp_type == IB_QPT_UD) {
174 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl;
175 struct mlx4_av *av = (struct mlx4_av *)dgram->av;
176 memset(dgram, 0, sizeof *dgram);
177 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn);
178 s += sizeof(struct mlx4_wqe_datagram_seg);
179 }
180
181 /* Pad the remainder of the WQE with an inline data segment. */
182 if (size > s) {
183 inl = wqe + s;
184 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl));
185 }
186 ctrl->srcrb_flags = 0;
187 ctrl->fence_size = size / 16;
188 /*
189 * Make sure descriptor is fully written before setting ownership bit
190 * (because HW can start executing as soon as we do).
191 */
192 wmb();
193
194 ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) |
195 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);
196
197 stamp_send_wqe(qp, n + qp->sq_spare_wqes, size);
198 }
199
200 /* Post NOP WQE to prevent wrap-around in the middle of WR */
201 static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind)
202 {
203 unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1));
204 if (unlikely(s < qp->sq_max_wqes_per_wr)) {
205 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift);
206 ind += s;
207 }
208 return ind;
209 }
210
211 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
212 {
213 struct ib_event event;
214 struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;
215
216 if (type == MLX4_EVENT_TYPE_PATH_MIG)
217 to_mibqp(qp)->port = to_mibqp(qp)->alt_port;
218
219 if (ibqp->event_handler) {
220 event.device = ibqp->device;
221 event.element.qp = ibqp;
222 switch (type) {
223 case MLX4_EVENT_TYPE_PATH_MIG:
224 event.event = IB_EVENT_PATH_MIG;
225 break;
226 case MLX4_EVENT_TYPE_COMM_EST:
227 event.event = IB_EVENT_COMM_EST;
228 break;
229 case MLX4_EVENT_TYPE_SQ_DRAINED:
230 event.event = IB_EVENT_SQ_DRAINED;
231 break;
232 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
233 event.event = IB_EVENT_QP_LAST_WQE_REACHED;
234 break;
235 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
236 event.event = IB_EVENT_QP_FATAL;
237 break;
238 case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
239 event.event = IB_EVENT_PATH_MIG_ERR;
240 break;
241 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
242 event.event = IB_EVENT_QP_REQ_ERR;
243 break;
244 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
245 event.event = IB_EVENT_QP_ACCESS_ERR;
246 break;
247 default:
248 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
249 "on QP %06x\n", type, qp->qpn);
250 return;
251 }
252
253 ibqp->event_handler(&event, ibqp->qp_context);
254 }
255 }
256
257 static int send_wqe_overhead(enum ib_qp_type type, u32 flags)
258 {
259 /*
260 * UD WQEs must have a datagram segment.
261 * RC and UC WQEs might have a remote address segment.
262 * MLX WQEs need two extra inline data segments (for the UD
263 * header and space for the ICRC).
264 */
265 switch (type) {
266 case IB_QPT_UD:
267 return sizeof (struct mlx4_wqe_ctrl_seg) +
268 sizeof (struct mlx4_wqe_datagram_seg) +
269 ((flags & MLX4_IB_QP_LSO) ? MLX4_IB_LSO_HEADER_SPARE : 0);
270 case IB_QPT_UC:
271 return sizeof (struct mlx4_wqe_ctrl_seg) +
272 sizeof (struct mlx4_wqe_raddr_seg);
273 case IB_QPT_RC:
274 return sizeof (struct mlx4_wqe_ctrl_seg) +
275 sizeof (struct mlx4_wqe_atomic_seg) +
276 sizeof (struct mlx4_wqe_raddr_seg);
277 case IB_QPT_SMI:
278 case IB_QPT_GSI:
279 return sizeof (struct mlx4_wqe_ctrl_seg) +
280 ALIGN(MLX4_IB_UD_HEADER_SIZE +
281 DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE,
282 MLX4_INLINE_ALIGN) *
283 sizeof (struct mlx4_wqe_inline_seg),
284 sizeof (struct mlx4_wqe_data_seg)) +
285 ALIGN(4 +
286 sizeof (struct mlx4_wqe_inline_seg),
287 sizeof (struct mlx4_wqe_data_seg));
288 default:
289 return sizeof (struct mlx4_wqe_ctrl_seg);
290 }
291 }
292
293 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
294 int is_user, int has_srq, struct mlx4_ib_qp *qp)
295 {
296 /* Sanity check RQ size before proceeding */
297 if (cap->max_recv_wr > dev->dev->caps.max_wqes ||
298 cap->max_recv_sge > dev->dev->caps.max_rq_sg)
299 return -EINVAL;
300
301 if (has_srq) {
302 /* QPs attached to an SRQ should have no RQ */
303 if (cap->max_recv_wr)
304 return -EINVAL;
305
306 qp->rq.wqe_cnt = qp->rq.max_gs = 0;
307 } else {
308 /* HW requires >= 1 RQ entry with >= 1 gather entry */
309 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
310 return -EINVAL;
311
312 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr));
313 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge));
314 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
315 }
316
317 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt;
318 cap->max_recv_sge = qp->rq.max_gs;
319
320 return 0;
321 }
322
323 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
324 enum ib_qp_type type, struct mlx4_ib_qp *qp)
325 {
326 int s;
327
328 /* Sanity check SQ size before proceeding */
329 if (cap->max_send_wr > dev->dev->caps.max_wqes ||
330 cap->max_send_sge > dev->dev->caps.max_sq_sg ||
331 cap->max_inline_data + send_wqe_overhead(type, qp->flags) +
332 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
333 return -EINVAL;
334
335 /*
336 * For MLX transport we need 2 extra S/G entries:
337 * one for the header and one for the checksum at the end
338 */
339 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
340 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
341 return -EINVAL;
342
343 s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg),
344 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) +
345 send_wqe_overhead(type, qp->flags);
346
347 if (s > dev->dev->caps.max_sq_desc_sz)
348 return -EINVAL;
349
350 /*
351 * Hermon supports shrinking WQEs, such that a single work
352 * request can include multiple units of 1 << wqe_shift. This
353 * way, work requests can differ in size, and do not have to
354 * be a power of 2 in size, saving memory and speeding up send
355 * WR posting. Unfortunately, if we do this then the
356 * wqe_index field in CQEs can't be used to look up the WR ID
357 * anymore, so we do this only if selective signaling is off.
358 *
359 * Further, on 32-bit platforms, we can't use vmap() to make
360 * the QP buffer virtually contiguous. Thus we have to use
361 * constant-sized WRs to make sure a WR is always fully within
362 * a single page-sized chunk.
363 *
364 * Finally, we use NOP work requests to pad the end of the
365 * work queue, to avoid wrap-around in the middle of WR. We
366 * set NEC bit to avoid getting completions with error for
367 * these NOP WRs, but since NEC is only supported starting
368 * with firmware 2.2.232, we use constant-sized WRs for older
369 * firmware.
370 *
371 * And, since MLX QPs only support SEND, we use constant-sized
372 * WRs in this case.
373 *
374 * We look for the smallest value of wqe_shift such that the
375 * resulting number of wqes does not exceed device
376 * capabilities.
377 *
378 * We set WQE size to at least 64 bytes, this way stamping
379 * invalidates each WQE.
380 */
381 if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC &&
382 qp->sq_signal_bits && BITS_PER_LONG == 64 &&
383 type != IB_QPT_SMI && type != IB_QPT_GSI)
384 qp->sq.wqe_shift = ilog2(64);
385 else
386 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s));
387
388 for (;;) {
389 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift);
390
391 /*
392 * We need to leave 2 KB + 1 WR of headroom in the SQ to
393 * allow HW to prefetch.
394 */
395 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr;
396 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr *
397 qp->sq_max_wqes_per_wr +
398 qp->sq_spare_wqes);
399
400 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes)
401 break;
402
403 if (qp->sq_max_wqes_per_wr <= 1)
404 return -EINVAL;
405
406 ++qp->sq.wqe_shift;
407 }
408
409 qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz,
410 (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) -
411 send_wqe_overhead(type, qp->flags)) /
412 sizeof (struct mlx4_wqe_data_seg);
413
414 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
415 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
416 if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
417 qp->rq.offset = 0;
418 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
419 } else {
420 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
421 qp->sq.offset = 0;
422 }
423
424 cap->max_send_wr = qp->sq.max_post =
425 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr;
426 cap->max_send_sge = min(qp->sq.max_gs,
427 min(dev->dev->caps.max_sq_sg,
428 dev->dev->caps.max_rq_sg));
429 /* We don't support inline sends for kernel QPs (yet) */
430 cap->max_inline_data = 0;
431
432 return 0;
433 }
434
435 static int set_user_sq_size(struct mlx4_ib_dev *dev,
436 struct mlx4_ib_qp *qp,
437 struct mlx4_ib_create_qp *ucmd)
438 {
439 /* Sanity check SQ size before proceeding */
440 if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes ||
441 ucmd->log_sq_stride >
442 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) ||
443 ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
444 return -EINVAL;
445
446 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count;
447 qp->sq.wqe_shift = ucmd->log_sq_stride;
448
449 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
450 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
451
452 return 0;
453 }
454
455 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
456 struct ib_qp_init_attr *init_attr,
457 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
458 {
459 int qpn;
460 int err;
461
462 mutex_init(&qp->mutex);
463 spin_lock_init(&qp->sq.lock);
464 spin_lock_init(&qp->rq.lock);
465
466 qp->state = IB_QPS_RESET;
467 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
468 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
469
470 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp);
471 if (err)
472 goto err;
473
474 if (pd->uobject) {
475 struct mlx4_ib_create_qp ucmd;
476
477 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
478 err = -EFAULT;
479 goto err;
480 }
481
482 qp->sq_no_prefetch = ucmd.sq_no_prefetch;
483
484 err = set_user_sq_size(dev, qp, &ucmd);
485 if (err)
486 goto err;
487
488 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
489 qp->buf_size, 0, 0);
490 if (IS_ERR(qp->umem)) {
491 err = PTR_ERR(qp->umem);
492 goto err;
493 }
494
495 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
496 ilog2(qp->umem->page_size), &qp->mtt);
497 if (err)
498 goto err_buf;
499
500 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
501 if (err)
502 goto err_mtt;
503
504 if (!init_attr->srq) {
505 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
506 ucmd.db_addr, &qp->db);
507 if (err)
508 goto err_mtt;
509 }
510 } else {
511 qp->sq_no_prefetch = 0;
512
513 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)
514 qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK;
515
516 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO)
517 qp->flags |= MLX4_IB_QP_LSO;
518
519 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
520 if (err)
521 goto err;
522
523 if (!init_attr->srq) {
524 err = mlx4_db_alloc(dev->dev, &qp->db, 0);
525 if (err)
526 goto err;
527
528 *qp->db.db = 0;
529 }
530
531 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
532 err = -ENOMEM;
533 goto err_db;
534 }
535
536 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
537 &qp->mtt);
538 if (err)
539 goto err_buf;
540
541 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
542 if (err)
543 goto err_mtt;
544
545 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
546 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
547
548 if (!qp->sq.wrid || !qp->rq.wrid) {
549 err = -ENOMEM;
550 goto err_wrid;
551 }
552 }
553
554 if (sqpn) {
555 qpn = sqpn;
556 } else {
557 err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn);
558 if (err)
559 goto err_wrid;
560 }
561
562 err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp);
563 if (err)
564 goto err_qpn;
565
566 /*
567 * Hardware wants QPN written in big-endian order (after
568 * shifting) for send doorbell. Precompute this value to save
569 * a little bit when posting sends.
570 */
571 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
572
573 qp->mqp.event = mlx4_ib_qp_event;
574
575 return 0;
576
577 err_qpn:
578 if (!sqpn)
579 mlx4_qp_release_range(dev->dev, qpn, 1);
580
581 err_wrid:
582 if (pd->uobject) {
583 if (!init_attr->srq)
584 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context),
585 &qp->db);
586 } else {
587 kfree(qp->sq.wrid);
588 kfree(qp->rq.wrid);
589 }
590
591 err_mtt:
592 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
593
594 err_buf:
595 if (pd->uobject)
596 ib_umem_release(qp->umem);
597 else
598 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
599
600 err_db:
601 if (!pd->uobject && !init_attr->srq)
602 mlx4_db_free(dev->dev, &qp->db);
603
604 err:
605 return err;
606 }
607
608 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
609 {
610 switch (state) {
611 case IB_QPS_RESET: return MLX4_QP_STATE_RST;
612 case IB_QPS_INIT: return MLX4_QP_STATE_INIT;
613 case IB_QPS_RTR: return MLX4_QP_STATE_RTR;
614 case IB_QPS_RTS: return MLX4_QP_STATE_RTS;
615 case IB_QPS_SQD: return MLX4_QP_STATE_SQD;
616 case IB_QPS_SQE: return MLX4_QP_STATE_SQER;
617 case IB_QPS_ERR: return MLX4_QP_STATE_ERR;
618 default: return -1;
619 }
620 }
621
622 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
623 __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
624 {
625 if (send_cq == recv_cq) {
626 spin_lock_irq(&send_cq->lock);
627 __acquire(&recv_cq->lock);
628 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
629 spin_lock_irq(&send_cq->lock);
630 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
631 } else {
632 spin_lock_irq(&recv_cq->lock);
633 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
634 }
635 }
636
637 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
638 __releases(&send_cq->lock) __releases(&recv_cq->lock)
639 {
640 if (send_cq == recv_cq) {
641 __release(&recv_cq->lock);
642 spin_unlock_irq(&send_cq->lock);
643 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
644 spin_unlock(&recv_cq->lock);
645 spin_unlock_irq(&send_cq->lock);
646 } else {
647 spin_unlock(&send_cq->lock);
648 spin_unlock_irq(&recv_cq->lock);
649 }
650 }
651
652 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
653 int is_user)
654 {
655 struct mlx4_ib_cq *send_cq, *recv_cq;
656
657 if (qp->state != IB_QPS_RESET)
658 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
659 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
660 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
661 qp->mqp.qpn);
662
663 send_cq = to_mcq(qp->ibqp.send_cq);
664 recv_cq = to_mcq(qp->ibqp.recv_cq);
665
666 mlx4_ib_lock_cqs(send_cq, recv_cq);
667
668 if (!is_user) {
669 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
670 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
671 if (send_cq != recv_cq)
672 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
673 }
674
675 mlx4_qp_remove(dev->dev, &qp->mqp);
676
677 mlx4_ib_unlock_cqs(send_cq, recv_cq);
678
679 mlx4_qp_free(dev->dev, &qp->mqp);
680
681 if (!is_sqp(dev, qp))
682 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1);
683
684 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
685
686 if (is_user) {
687 if (!qp->ibqp.srq)
688 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
689 &qp->db);
690 ib_umem_release(qp->umem);
691 } else {
692 kfree(qp->sq.wrid);
693 kfree(qp->rq.wrid);
694 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
695 if (!qp->ibqp.srq)
696 mlx4_db_free(dev->dev, &qp->db);
697 }
698 }
699
700 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
701 struct ib_qp_init_attr *init_attr,
702 struct ib_udata *udata)
703 {
704 struct mlx4_ib_dev *dev = to_mdev(pd->device);
705 struct mlx4_ib_sqp *sqp;
706 struct mlx4_ib_qp *qp;
707 int err;
708
709 /*
710 * We only support LSO and multicast loopback blocking, and
711 * only for kernel UD QPs.
712 */
713 if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO |
714 IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK))
715 return ERR_PTR(-EINVAL);
716
717 if (init_attr->create_flags &&
718 (pd->uobject || init_attr->qp_type != IB_QPT_UD))
719 return ERR_PTR(-EINVAL);
720
721 switch (init_attr->qp_type) {
722 case IB_QPT_RC:
723 case IB_QPT_UC:
724 case IB_QPT_UD:
725 {
726 qp = kzalloc(sizeof *qp, GFP_KERNEL);
727 if (!qp)
728 return ERR_PTR(-ENOMEM);
729
730 err = create_qp_common(dev, pd, init_attr, udata, 0, qp);
731 if (err) {
732 kfree(qp);
733 return ERR_PTR(err);
734 }
735
736 qp->ibqp.qp_num = qp->mqp.qpn;
737
738 break;
739 }
740 case IB_QPT_SMI:
741 case IB_QPT_GSI:
742 {
743 /* Userspace is not allowed to create special QPs: */
744 if (pd->uobject)
745 return ERR_PTR(-EINVAL);
746
747 sqp = kzalloc(sizeof *sqp, GFP_KERNEL);
748 if (!sqp)
749 return ERR_PTR(-ENOMEM);
750
751 qp = &sqp->qp;
752
753 err = create_qp_common(dev, pd, init_attr, udata,
754 dev->dev->caps.sqp_start +
755 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
756 init_attr->port_num - 1,
757 qp);
758 if (err) {
759 kfree(sqp);
760 return ERR_PTR(err);
761 }
762
763 qp->port = init_attr->port_num;
764 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
765
766 break;
767 }
768 default:
769 /* Don't support raw QPs */
770 return ERR_PTR(-EINVAL);
771 }
772
773 return &qp->ibqp;
774 }
775
776 int mlx4_ib_destroy_qp(struct ib_qp *qp)
777 {
778 struct mlx4_ib_dev *dev = to_mdev(qp->device);
779 struct mlx4_ib_qp *mqp = to_mqp(qp);
780
781 if (is_qp0(dev, mqp))
782 mlx4_CLOSE_PORT(dev->dev, mqp->port);
783
784 destroy_qp_common(dev, mqp, !!qp->pd->uobject);
785
786 if (is_sqp(dev, mqp))
787 kfree(to_msqp(mqp));
788 else
789 kfree(mqp);
790
791 return 0;
792 }
793
794 static int to_mlx4_st(enum ib_qp_type type)
795 {
796 switch (type) {
797 case IB_QPT_RC: return MLX4_QP_ST_RC;
798 case IB_QPT_UC: return MLX4_QP_ST_UC;
799 case IB_QPT_UD: return MLX4_QP_ST_UD;
800 case IB_QPT_SMI:
801 case IB_QPT_GSI: return MLX4_QP_ST_MLX;
802 default: return -1;
803 }
804 }
805
806 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
807 int attr_mask)
808 {
809 u8 dest_rd_atomic;
810 u32 access_flags;
811 u32 hw_access_flags = 0;
812
813 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
814 dest_rd_atomic = attr->max_dest_rd_atomic;
815 else
816 dest_rd_atomic = qp->resp_depth;
817
818 if (attr_mask & IB_QP_ACCESS_FLAGS)
819 access_flags = attr->qp_access_flags;
820 else
821 access_flags = qp->atomic_rd_en;
822
823 if (!dest_rd_atomic)
824 access_flags &= IB_ACCESS_REMOTE_WRITE;
825
826 if (access_flags & IB_ACCESS_REMOTE_READ)
827 hw_access_flags |= MLX4_QP_BIT_RRE;
828 if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
829 hw_access_flags |= MLX4_QP_BIT_RAE;
830 if (access_flags & IB_ACCESS_REMOTE_WRITE)
831 hw_access_flags |= MLX4_QP_BIT_RWE;
832
833 return cpu_to_be32(hw_access_flags);
834 }
835
836 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
837 int attr_mask)
838 {
839 if (attr_mask & IB_QP_PKEY_INDEX)
840 sqp->pkey_index = attr->pkey_index;
841 if (attr_mask & IB_QP_QKEY)
842 sqp->qkey = attr->qkey;
843 if (attr_mask & IB_QP_SQ_PSN)
844 sqp->send_psn = attr->sq_psn;
845 }
846
847 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
848 {
849 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
850 }
851
852 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
853 struct mlx4_qp_path *path, u8 port)
854 {
855 path->grh_mylmc = ah->src_path_bits & 0x7f;
856 path->rlid = cpu_to_be16(ah->dlid);
857 if (ah->static_rate) {
858 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
859 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
860 !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
861 --path->static_rate;
862 } else
863 path->static_rate = 0;
864 path->counter_index = 0xff;
865
866 if (ah->ah_flags & IB_AH_GRH) {
867 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
868 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
869 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
870 return -1;
871 }
872
873 path->grh_mylmc |= 1 << 7;
874 path->mgid_index = ah->grh.sgid_index;
875 path->hop_limit = ah->grh.hop_limit;
876 path->tclass_flowlabel =
877 cpu_to_be32((ah->grh.traffic_class << 20) |
878 (ah->grh.flow_label));
879 memcpy(path->rgid, ah->grh.dgid.raw, 16);
880 }
881
882 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
883 ((port - 1) << 6) | ((ah->sl & 0xf) << 2);
884
885 return 0;
886 }
887
888 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
889 const struct ib_qp_attr *attr, int attr_mask,
890 enum ib_qp_state cur_state, enum ib_qp_state new_state)
891 {
892 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
893 struct mlx4_ib_qp *qp = to_mqp(ibqp);
894 struct mlx4_qp_context *context;
895 enum mlx4_qp_optpar optpar = 0;
896 int sqd_event;
897 int err = -EINVAL;
898
899 context = kzalloc(sizeof *context, GFP_KERNEL);
900 if (!context)
901 return -ENOMEM;
902
903 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
904 (to_mlx4_st(ibqp->qp_type) << 16));
905
906 if (!(attr_mask & IB_QP_PATH_MIG_STATE))
907 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
908 else {
909 optpar |= MLX4_QP_OPTPAR_PM_STATE;
910 switch (attr->path_mig_state) {
911 case IB_MIG_MIGRATED:
912 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
913 break;
914 case IB_MIG_REARM:
915 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
916 break;
917 case IB_MIG_ARMED:
918 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
919 break;
920 }
921 }
922
923 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI)
924 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
925 else if (ibqp->qp_type == IB_QPT_UD) {
926 if (qp->flags & MLX4_IB_QP_LSO)
927 context->mtu_msgmax = (IB_MTU_4096 << 5) |
928 ilog2(dev->dev->caps.max_gso_sz);
929 else
930 context->mtu_msgmax = (IB_MTU_4096 << 5) | 12;
931 } else if (attr_mask & IB_QP_PATH_MTU) {
932 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
933 printk(KERN_ERR "path MTU (%u) is invalid\n",
934 attr->path_mtu);
935 goto out;
936 }
937 context->mtu_msgmax = (attr->path_mtu << 5) |
938 ilog2(dev->dev->caps.max_msg_sz);
939 }
940
941 if (qp->rq.wqe_cnt)
942 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
943 context->rq_size_stride |= qp->rq.wqe_shift - 4;
944
945 if (qp->sq.wqe_cnt)
946 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
947 context->sq_size_stride |= qp->sq.wqe_shift - 4;
948
949 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
950 context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
951
952 if (qp->ibqp.uobject)
953 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
954 else
955 context->usr_page = cpu_to_be32(dev->priv_uar.index);
956
957 if (attr_mask & IB_QP_DEST_QPN)
958 context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
959
960 if (attr_mask & IB_QP_PORT) {
961 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
962 !(attr_mask & IB_QP_AV)) {
963 mlx4_set_sched(&context->pri_path, attr->port_num);
964 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
965 }
966 }
967
968 if (attr_mask & IB_QP_PKEY_INDEX) {
969 context->pri_path.pkey_index = attr->pkey_index;
970 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
971 }
972
973 if (attr_mask & IB_QP_AV) {
974 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
975 attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
976 goto out;
977
978 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
979 MLX4_QP_OPTPAR_SCHED_QUEUE);
980 }
981
982 if (attr_mask & IB_QP_TIMEOUT) {
983 context->pri_path.ackto = attr->timeout << 3;
984 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
985 }
986
987 if (attr_mask & IB_QP_ALT_PATH) {
988 if (attr->alt_port_num == 0 ||
989 attr->alt_port_num > dev->dev->caps.num_ports)
990 goto out;
991
992 if (attr->alt_pkey_index >=
993 dev->dev->caps.pkey_table_len[attr->alt_port_num])
994 goto out;
995
996 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
997 attr->alt_port_num))
998 goto out;
999
1000 context->alt_path.pkey_index = attr->alt_pkey_index;
1001 context->alt_path.ackto = attr->alt_timeout << 3;
1002 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
1003 }
1004
1005 context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn);
1006 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
1007
1008 /* Set "fast registration enabled" for all kernel QPs */
1009 if (!qp->ibqp.uobject)
1010 context->params1 |= cpu_to_be32(1 << 11);
1011
1012 if (attr_mask & IB_QP_RNR_RETRY) {
1013 context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
1014 optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
1015 }
1016
1017 if (attr_mask & IB_QP_RETRY_CNT) {
1018 context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
1019 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
1020 }
1021
1022 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
1023 if (attr->max_rd_atomic)
1024 context->params1 |=
1025 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
1026 optpar |= MLX4_QP_OPTPAR_SRA_MAX;
1027 }
1028
1029 if (attr_mask & IB_QP_SQ_PSN)
1030 context->next_send_psn = cpu_to_be32(attr->sq_psn);
1031
1032 context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn);
1033
1034 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
1035 if (attr->max_dest_rd_atomic)
1036 context->params2 |=
1037 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
1038 optpar |= MLX4_QP_OPTPAR_RRA_MAX;
1039 }
1040
1041 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
1042 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
1043 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
1044 }
1045
1046 if (ibqp->srq)
1047 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
1048
1049 if (attr_mask & IB_QP_MIN_RNR_TIMER) {
1050 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
1051 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
1052 }
1053 if (attr_mask & IB_QP_RQ_PSN)
1054 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
1055
1056 context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn);
1057
1058 if (attr_mask & IB_QP_QKEY) {
1059 context->qkey = cpu_to_be32(attr->qkey);
1060 optpar |= MLX4_QP_OPTPAR_Q_KEY;
1061 }
1062
1063 if (ibqp->srq)
1064 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
1065
1066 if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1067 context->db_rec_addr = cpu_to_be64(qp->db.dma);
1068
1069 if (cur_state == IB_QPS_INIT &&
1070 new_state == IB_QPS_RTR &&
1071 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
1072 ibqp->qp_type == IB_QPT_UD)) {
1073 context->pri_path.sched_queue = (qp->port - 1) << 6;
1074 if (is_qp0(dev, qp))
1075 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
1076 else
1077 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
1078 }
1079
1080 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD &&
1081 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
1082 sqd_event = 1;
1083 else
1084 sqd_event = 0;
1085
1086 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1087 context->rlkey |= (1 << 4);
1088
1089 /*
1090 * Before passing a kernel QP to the HW, make sure that the
1091 * ownership bits of the send queue are set and the SQ
1092 * headroom is stamped so that the hardware doesn't start
1093 * processing stale work requests.
1094 */
1095 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1096 struct mlx4_wqe_ctrl_seg *ctrl;
1097 int i;
1098
1099 for (i = 0; i < qp->sq.wqe_cnt; ++i) {
1100 ctrl = get_send_wqe(qp, i);
1101 ctrl->owner_opcode = cpu_to_be32(1 << 31);
1102 if (qp->sq_max_wqes_per_wr == 1)
1103 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4);
1104
1105 stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift);
1106 }
1107 }
1108
1109 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
1110 to_mlx4_state(new_state), context, optpar,
1111 sqd_event, &qp->mqp);
1112 if (err)
1113 goto out;
1114
1115 qp->state = new_state;
1116
1117 if (attr_mask & IB_QP_ACCESS_FLAGS)
1118 qp->atomic_rd_en = attr->qp_access_flags;
1119 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
1120 qp->resp_depth = attr->max_dest_rd_atomic;
1121 if (attr_mask & IB_QP_PORT)
1122 qp->port = attr->port_num;
1123 if (attr_mask & IB_QP_ALT_PATH)
1124 qp->alt_port = attr->alt_port_num;
1125
1126 if (is_sqp(dev, qp))
1127 store_sqp_attrs(to_msqp(qp), attr, attr_mask);
1128
1129 /*
1130 * If we moved QP0 to RTR, bring the IB link up; if we moved
1131 * QP0 to RESET or ERROR, bring the link back down.
1132 */
1133 if (is_qp0(dev, qp)) {
1134 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
1135 if (mlx4_INIT_PORT(dev->dev, qp->port))
1136 printk(KERN_WARNING "INIT_PORT failed for port %d\n",
1137 qp->port);
1138
1139 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
1140 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
1141 mlx4_CLOSE_PORT(dev->dev, qp->port);
1142 }
1143
1144 /*
1145 * If we moved a kernel QP to RESET, clean up all old CQ
1146 * entries and reinitialize the QP.
1147 */
1148 if (new_state == IB_QPS_RESET && !ibqp->uobject) {
1149 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn,
1150 ibqp->srq ? to_msrq(ibqp->srq): NULL);
1151 if (ibqp->send_cq != ibqp->recv_cq)
1152 mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL);
1153
1154 qp->rq.head = 0;
1155 qp->rq.tail = 0;
1156 qp->sq.head = 0;
1157 qp->sq.tail = 0;
1158 qp->sq_next_wqe = 0;
1159 if (!ibqp->srq)
1160 *qp->db.db = 0;
1161 }
1162
1163 out:
1164 kfree(context);
1165 return err;
1166 }
1167
1168 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
1169 int attr_mask, struct ib_udata *udata)
1170 {
1171 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1172 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1173 enum ib_qp_state cur_state, new_state;
1174 int err = -EINVAL;
1175
1176 mutex_lock(&qp->mutex);
1177
1178 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
1179 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
1180
1181 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
1182 goto out;
1183
1184 if ((attr_mask & IB_QP_PORT) &&
1185 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
1186 goto out;
1187 }
1188
1189 if (attr_mask & IB_QP_PKEY_INDEX) {
1190 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
1191 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p])
1192 goto out;
1193 }
1194
1195 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
1196 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
1197 goto out;
1198 }
1199
1200 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
1201 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
1202 goto out;
1203 }
1204
1205 if (cur_state == new_state && cur_state == IB_QPS_RESET) {
1206 err = 0;
1207 goto out;
1208 }
1209
1210 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
1211
1212 out:
1213 mutex_unlock(&qp->mutex);
1214 return err;
1215 }
1216
1217 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
1218 void *wqe, unsigned *mlx_seg_len)
1219 {
1220 struct ib_device *ib_dev = sqp->qp.ibqp.device;
1221 struct mlx4_wqe_mlx_seg *mlx = wqe;
1222 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1223 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1224 u16 pkey;
1225 int send_size;
1226 int header_size;
1227 int spc;
1228 int i;
1229
1230 send_size = 0;
1231 for (i = 0; i < wr->num_sge; ++i)
1232 send_size += wr->sg_list[i].length;
1233
1234 ib_ud_header_init(send_size, mlx4_ib_ah_grh_present(ah), 0, &sqp->ud_header);
1235
1236 sqp->ud_header.lrh.service_level =
1237 be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 28;
1238 sqp->ud_header.lrh.destination_lid = ah->av.dlid;
1239 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.g_slid & 0x7f);
1240 if (mlx4_ib_ah_grh_present(ah)) {
1241 sqp->ud_header.grh.traffic_class =
1242 (be32_to_cpu(ah->av.sl_tclass_flowlabel) >> 20) & 0xff;
1243 sqp->ud_header.grh.flow_label =
1244 ah->av.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
1245 sqp->ud_header.grh.hop_limit = ah->av.hop_limit;
1246 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.port_pd) >> 24,
1247 ah->av.gid_index, &sqp->ud_header.grh.source_gid);
1248 memcpy(sqp->ud_header.grh.destination_gid.raw,
1249 ah->av.dgid, 16);
1250 }
1251
1252 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1253 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
1254 (sqp->ud_header.lrh.destination_lid ==
1255 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
1256 (sqp->ud_header.lrh.service_level << 8));
1257 mlx->rlid = sqp->ud_header.lrh.destination_lid;
1258
1259 switch (wr->opcode) {
1260 case IB_WR_SEND:
1261 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1262 sqp->ud_header.immediate_present = 0;
1263 break;
1264 case IB_WR_SEND_WITH_IMM:
1265 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1266 sqp->ud_header.immediate_present = 1;
1267 sqp->ud_header.immediate_data = wr->ex.imm_data;
1268 break;
1269 default:
1270 return -EINVAL;
1271 }
1272
1273 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0;
1274 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1275 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1276 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1277 if (!sqp->qp.ibqp.qp_num)
1278 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
1279 else
1280 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
1281 sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1282 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1283 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1284 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1285 sqp->qkey : wr->wr.ud.remote_qkey);
1286 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1287
1288 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1289
1290 if (0) {
1291 printk(KERN_ERR "built UD header of size %d:\n", header_size);
1292 for (i = 0; i < header_size / 4; ++i) {
1293 if (i % 8 == 0)
1294 printk(" [%02x] ", i * 4);
1295 printk(" %08x",
1296 be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
1297 if ((i + 1) % 8 == 0)
1298 printk("\n");
1299 }
1300 printk("\n");
1301 }
1302
1303 /*
1304 * Inline data segments may not cross a 64 byte boundary. If
1305 * our UD header is bigger than the space available up to the
1306 * next 64 byte boundary in the WQE, use two inline data
1307 * segments to hold the UD header.
1308 */
1309 spc = MLX4_INLINE_ALIGN -
1310 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1311 if (header_size <= spc) {
1312 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1313 memcpy(inl + 1, sqp->header_buf, header_size);
1314 i = 1;
1315 } else {
1316 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1317 memcpy(inl + 1, sqp->header_buf, spc);
1318
1319 inl = (void *) (inl + 1) + spc;
1320 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1321 /*
1322 * Need a barrier here to make sure all the data is
1323 * visible before the byte_count field is set.
1324 * Otherwise the HCA prefetcher could grab the 64-byte
1325 * chunk with this inline segment and get a valid (!=
1326 * 0xffffffff) byte count but stale data, and end up
1327 * generating a packet with bad headers.
1328 *
1329 * The first inline segment's byte_count field doesn't
1330 * need a barrier, because it comes after a
1331 * control/MLX segment and therefore is at an offset
1332 * of 16 mod 64.
1333 */
1334 wmb();
1335 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1336 i = 2;
1337 }
1338
1339 *mlx_seg_len =
1340 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1341 return 0;
1342 }
1343
1344 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
1345 {
1346 unsigned cur;
1347 struct mlx4_ib_cq *cq;
1348
1349 cur = wq->head - wq->tail;
1350 if (likely(cur + nreq < wq->max_post))
1351 return 0;
1352
1353 cq = to_mcq(ib_cq);
1354 spin_lock(&cq->lock);
1355 cur = wq->head - wq->tail;
1356 spin_unlock(&cq->lock);
1357
1358 return cur + nreq >= wq->max_post;
1359 }
1360
1361 static __be32 convert_access(int acc)
1362 {
1363 return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC) : 0) |
1364 (acc & IB_ACCESS_REMOTE_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) |
1365 (acc & IB_ACCESS_REMOTE_READ ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ) : 0) |
1366 (acc & IB_ACCESS_LOCAL_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE) : 0) |
1367 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ);
1368 }
1369
1370 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr)
1371 {
1372 struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list);
1373 int i;
1374
1375 for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i)
1376 mfrpl->mapped_page_list[i] =
1377 cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] |
1378 MLX4_MTT_FLAG_PRESENT);
1379
1380 fseg->flags = convert_access(wr->wr.fast_reg.access_flags);
1381 fseg->mem_key = cpu_to_be32(wr->wr.fast_reg.rkey);
1382 fseg->buf_list = cpu_to_be64(mfrpl->map);
1383 fseg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start);
1384 fseg->reg_len = cpu_to_be64(wr->wr.fast_reg.length);
1385 fseg->offset = 0;
1386 fseg->page_size = cpu_to_be32(wr->wr.fast_reg.page_shift);
1387 fseg->reserved[0] = 0;
1388 fseg->reserved[1] = 0;
1389 }
1390
1391 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey)
1392 {
1393 iseg->flags = 0;
1394 iseg->mem_key = cpu_to_be32(rkey);
1395 iseg->guest_id = 0;
1396 iseg->pa = 0;
1397 }
1398
1399 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,
1400 u64 remote_addr, u32 rkey)
1401 {
1402 rseg->raddr = cpu_to_be64(remote_addr);
1403 rseg->rkey = cpu_to_be32(rkey);
1404 rseg->reserved = 0;
1405 }
1406
1407 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr)
1408 {
1409 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1410 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1411 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add);
1412 } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) {
1413 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1414 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1415 } else {
1416 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1417 aseg->compare = 0;
1418 }
1419
1420 }
1421
1422 static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg,
1423 struct ib_send_wr *wr)
1424 {
1425 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1426 aseg->swap_add_mask = cpu_to_be64(wr->wr.atomic.swap_mask);
1427 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add);
1428 aseg->compare_mask = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1429 }
1430
1431 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
1432 struct ib_send_wr *wr)
1433 {
1434 memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
1435 dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1436 dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey);
1437 }
1438
1439 static void set_mlx_icrc_seg(void *dseg)
1440 {
1441 u32 *t = dseg;
1442 struct mlx4_wqe_inline_seg *iseg = dseg;
1443
1444 t[1] = 0;
1445
1446 /*
1447 * Need a barrier here before writing the byte_count field to
1448 * make sure that all the data is visible before the
1449 * byte_count field is set. Otherwise, if the segment begins
1450 * a new cacheline, the HCA prefetcher could grab the 64-byte
1451 * chunk and get a valid (!= * 0xffffffff) byte count but
1452 * stale data, and end up sending the wrong data.
1453 */
1454 wmb();
1455
1456 iseg->byte_count = cpu_to_be32((1 << 31) | 4);
1457 }
1458
1459 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1460 {
1461 dseg->lkey = cpu_to_be32(sg->lkey);
1462 dseg->addr = cpu_to_be64(sg->addr);
1463
1464 /*
1465 * Need a barrier here before writing the byte_count field to
1466 * make sure that all the data is visible before the
1467 * byte_count field is set. Otherwise, if the segment begins
1468 * a new cacheline, the HCA prefetcher could grab the 64-byte
1469 * chunk and get a valid (!= * 0xffffffff) byte count but
1470 * stale data, and end up sending the wrong data.
1471 */
1472 wmb();
1473
1474 dseg->byte_count = cpu_to_be32(sg->length);
1475 }
1476
1477 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1478 {
1479 dseg->byte_count = cpu_to_be32(sg->length);
1480 dseg->lkey = cpu_to_be32(sg->lkey);
1481 dseg->addr = cpu_to_be64(sg->addr);
1482 }
1483
1484 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr,
1485 struct mlx4_ib_qp *qp, unsigned *lso_seg_len,
1486 __be32 *lso_hdr_sz, __be32 *blh)
1487 {
1488 unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16);
1489
1490 if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE))
1491 *blh = cpu_to_be32(1 << 6);
1492
1493 if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) &&
1494 wr->num_sge > qp->sq.max_gs - (halign >> 4)))
1495 return -EINVAL;
1496
1497 memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen);
1498
1499 *lso_hdr_sz = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 |
1500 wr->wr.ud.hlen);
1501 *lso_seg_len = halign;
1502 return 0;
1503 }
1504
1505 static __be32 send_ieth(struct ib_send_wr *wr)
1506 {
1507 switch (wr->opcode) {
1508 case IB_WR_SEND_WITH_IMM:
1509 case IB_WR_RDMA_WRITE_WITH_IMM:
1510 return wr->ex.imm_data;
1511
1512 case IB_WR_SEND_WITH_INV:
1513 return cpu_to_be32(wr->ex.invalidate_rkey);
1514
1515 default:
1516 return 0;
1517 }
1518 }
1519
1520 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1521 struct ib_send_wr **bad_wr)
1522 {
1523 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1524 void *wqe;
1525 struct mlx4_wqe_ctrl_seg *ctrl;
1526 struct mlx4_wqe_data_seg *dseg;
1527 unsigned long flags;
1528 int nreq;
1529 int err = 0;
1530 unsigned ind;
1531 int uninitialized_var(stamp);
1532 int uninitialized_var(size);
1533 unsigned uninitialized_var(seglen);
1534 __be32 dummy;
1535 __be32 *lso_wqe;
1536 __be32 uninitialized_var(lso_hdr_sz);
1537 __be32 blh;
1538 int i;
1539
1540 spin_lock_irqsave(&qp->sq.lock, flags);
1541
1542 ind = qp->sq_next_wqe;
1543
1544 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1545 lso_wqe = &dummy;
1546 blh = 0;
1547
1548 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1549 err = -ENOMEM;
1550 *bad_wr = wr;
1551 goto out;
1552 }
1553
1554 if (unlikely(wr->num_sge > qp->sq.max_gs)) {
1555 err = -EINVAL;
1556 *bad_wr = wr;
1557 goto out;
1558 }
1559
1560 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
1561 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
1562
1563 ctrl->srcrb_flags =
1564 (wr->send_flags & IB_SEND_SIGNALED ?
1565 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
1566 (wr->send_flags & IB_SEND_SOLICITED ?
1567 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
1568 ((wr->send_flags & IB_SEND_IP_CSUM) ?
1569 cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
1570 MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) |
1571 qp->sq_signal_bits;
1572
1573 ctrl->imm = send_ieth(wr);
1574
1575 wqe += sizeof *ctrl;
1576 size = sizeof *ctrl / 16;
1577
1578 switch (ibqp->qp_type) {
1579 case IB_QPT_RC:
1580 case IB_QPT_UC:
1581 switch (wr->opcode) {
1582 case IB_WR_ATOMIC_CMP_AND_SWP:
1583 case IB_WR_ATOMIC_FETCH_AND_ADD:
1584 case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD:
1585 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1586 wr->wr.atomic.rkey);
1587 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1588
1589 set_atomic_seg(wqe, wr);
1590 wqe += sizeof (struct mlx4_wqe_atomic_seg);
1591
1592 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1593 sizeof (struct mlx4_wqe_atomic_seg)) / 16;
1594
1595 break;
1596
1597 case IB_WR_MASKED_ATOMIC_CMP_AND_SWP:
1598 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1599 wr->wr.atomic.rkey);
1600 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1601
1602 set_masked_atomic_seg(wqe, wr);
1603 wqe += sizeof (struct mlx4_wqe_masked_atomic_seg);
1604
1605 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1606 sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16;
1607
1608 break;
1609
1610 case IB_WR_RDMA_READ:
1611 case IB_WR_RDMA_WRITE:
1612 case IB_WR_RDMA_WRITE_WITH_IMM:
1613 set_raddr_seg(wqe, wr->wr.rdma.remote_addr,
1614 wr->wr.rdma.rkey);
1615 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1616 size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
1617 break;
1618
1619 case IB_WR_LOCAL_INV:
1620 ctrl->srcrb_flags |=
1621 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1622 set_local_inv_seg(wqe, wr->ex.invalidate_rkey);
1623 wqe += sizeof (struct mlx4_wqe_local_inval_seg);
1624 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16;
1625 break;
1626
1627 case IB_WR_FAST_REG_MR:
1628 ctrl->srcrb_flags |=
1629 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1630 set_fmr_seg(wqe, wr);
1631 wqe += sizeof (struct mlx4_wqe_fmr_seg);
1632 size += sizeof (struct mlx4_wqe_fmr_seg) / 16;
1633 break;
1634
1635 default:
1636 /* No extra segments required for sends */
1637 break;
1638 }
1639 break;
1640
1641 case IB_QPT_UD:
1642 set_datagram_seg(wqe, wr);
1643 wqe += sizeof (struct mlx4_wqe_datagram_seg);
1644 size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
1645
1646 if (wr->opcode == IB_WR_LSO) {
1647 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh);
1648 if (unlikely(err)) {
1649 *bad_wr = wr;
1650 goto out;
1651 }
1652 lso_wqe = (__be32 *) wqe;
1653 wqe += seglen;
1654 size += seglen / 16;
1655 }
1656 break;
1657
1658 case IB_QPT_SMI:
1659 case IB_QPT_GSI:
1660 err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen);
1661 if (unlikely(err)) {
1662 *bad_wr = wr;
1663 goto out;
1664 }
1665 wqe += seglen;
1666 size += seglen / 16;
1667 break;
1668
1669 default:
1670 break;
1671 }
1672
1673 /*
1674 * Write data segments in reverse order, so as to
1675 * overwrite cacheline stamp last within each
1676 * cacheline. This avoids issues with WQE
1677 * prefetching.
1678 */
1679
1680 dseg = wqe;
1681 dseg += wr->num_sge - 1;
1682 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16);
1683
1684 /* Add one more inline data segment for ICRC for MLX sends */
1685 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI ||
1686 qp->ibqp.qp_type == IB_QPT_GSI)) {
1687 set_mlx_icrc_seg(dseg + 1);
1688 size += sizeof (struct mlx4_wqe_data_seg) / 16;
1689 }
1690
1691 for (i = wr->num_sge - 1; i >= 0; --i, --dseg)
1692 set_data_seg(dseg, wr->sg_list + i);
1693
1694 /*
1695 * Possibly overwrite stamping in cacheline with LSO
1696 * segment only after making sure all data segments
1697 * are written.
1698 */
1699 wmb();
1700 *lso_wqe = lso_hdr_sz;
1701
1702 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
1703 MLX4_WQE_CTRL_FENCE : 0) | size;
1704
1705 /*
1706 * Make sure descriptor is fully written before
1707 * setting ownership bit (because HW can start
1708 * executing as soon as we do).
1709 */
1710 wmb();
1711
1712 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
1713 err = -EINVAL;
1714 goto out;
1715 }
1716
1717 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
1718 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh;
1719
1720 stamp = ind + qp->sq_spare_wqes;
1721 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift);
1722
1723 /*
1724 * We can improve latency by not stamping the last
1725 * send queue WQE until after ringing the doorbell, so
1726 * only stamp here if there are still more WQEs to post.
1727 *
1728 * Same optimization applies to padding with NOP wqe
1729 * in case of WQE shrinking (used to prevent wrap-around
1730 * in the middle of WR).
1731 */
1732 if (wr->next) {
1733 stamp_send_wqe(qp, stamp, size * 16);
1734 ind = pad_wraparound(qp, ind);
1735 }
1736 }
1737
1738 out:
1739 if (likely(nreq)) {
1740 qp->sq.head += nreq;
1741
1742 /*
1743 * Make sure that descriptors are written before
1744 * doorbell record.
1745 */
1746 wmb();
1747
1748 writel(qp->doorbell_qpn,
1749 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
1750
1751 /*
1752 * Make sure doorbells don't leak out of SQ spinlock
1753 * and reach the HCA out of order.
1754 */
1755 mmiowb();
1756
1757 stamp_send_wqe(qp, stamp, size * 16);
1758
1759 ind = pad_wraparound(qp, ind);
1760 qp->sq_next_wqe = ind;
1761 }
1762
1763 spin_unlock_irqrestore(&qp->sq.lock, flags);
1764
1765 return err;
1766 }
1767
1768 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1769 struct ib_recv_wr **bad_wr)
1770 {
1771 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1772 struct mlx4_wqe_data_seg *scat;
1773 unsigned long flags;
1774 int err = 0;
1775 int nreq;
1776 int ind;
1777 int i;
1778
1779 spin_lock_irqsave(&qp->rq.lock, flags);
1780
1781 ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
1782
1783 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1784 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1785 err = -ENOMEM;
1786 *bad_wr = wr;
1787 goto out;
1788 }
1789
1790 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1791 err = -EINVAL;
1792 *bad_wr = wr;
1793 goto out;
1794 }
1795
1796 scat = get_recv_wqe(qp, ind);
1797
1798 for (i = 0; i < wr->num_sge; ++i)
1799 __set_data_seg(scat + i, wr->sg_list + i);
1800
1801 if (i < qp->rq.max_gs) {
1802 scat[i].byte_count = 0;
1803 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
1804 scat[i].addr = 0;
1805 }
1806
1807 qp->rq.wrid[ind] = wr->wr_id;
1808
1809 ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
1810 }
1811
1812 out:
1813 if (likely(nreq)) {
1814 qp->rq.head += nreq;
1815
1816 /*
1817 * Make sure that descriptors are written before
1818 * doorbell record.
1819 */
1820 wmb();
1821
1822 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
1823 }
1824
1825 spin_unlock_irqrestore(&qp->rq.lock, flags);
1826
1827 return err;
1828 }
1829
1830 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
1831 {
1832 switch (mlx4_state) {
1833 case MLX4_QP_STATE_RST: return IB_QPS_RESET;
1834 case MLX4_QP_STATE_INIT: return IB_QPS_INIT;
1835 case MLX4_QP_STATE_RTR: return IB_QPS_RTR;
1836 case MLX4_QP_STATE_RTS: return IB_QPS_RTS;
1837 case MLX4_QP_STATE_SQ_DRAINING:
1838 case MLX4_QP_STATE_SQD: return IB_QPS_SQD;
1839 case MLX4_QP_STATE_SQER: return IB_QPS_SQE;
1840 case MLX4_QP_STATE_ERR: return IB_QPS_ERR;
1841 default: return -1;
1842 }
1843 }
1844
1845 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
1846 {
1847 switch (mlx4_mig_state) {
1848 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED;
1849 case MLX4_QP_PM_REARM: return IB_MIG_REARM;
1850 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED;
1851 default: return -1;
1852 }
1853 }
1854
1855 static int to_ib_qp_access_flags(int mlx4_flags)
1856 {
1857 int ib_flags = 0;
1858
1859 if (mlx4_flags & MLX4_QP_BIT_RRE)
1860 ib_flags |= IB_ACCESS_REMOTE_READ;
1861 if (mlx4_flags & MLX4_QP_BIT_RWE)
1862 ib_flags |= IB_ACCESS_REMOTE_WRITE;
1863 if (mlx4_flags & MLX4_QP_BIT_RAE)
1864 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
1865
1866 return ib_flags;
1867 }
1868
1869 static void to_ib_ah_attr(struct mlx4_dev *dev, struct ib_ah_attr *ib_ah_attr,
1870 struct mlx4_qp_path *path)
1871 {
1872 memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
1873 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1;
1874
1875 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
1876 return;
1877
1878 ib_ah_attr->dlid = be16_to_cpu(path->rlid);
1879 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf;
1880 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
1881 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0;
1882 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
1883 if (ib_ah_attr->ah_flags) {
1884 ib_ah_attr->grh.sgid_index = path->mgid_index;
1885 ib_ah_attr->grh.hop_limit = path->hop_limit;
1886 ib_ah_attr->grh.traffic_class =
1887 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
1888 ib_ah_attr->grh.flow_label =
1889 be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
1890 memcpy(ib_ah_attr->grh.dgid.raw,
1891 path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
1892 }
1893 }
1894
1895 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
1896 struct ib_qp_init_attr *qp_init_attr)
1897 {
1898 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1899 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1900 struct mlx4_qp_context context;
1901 int mlx4_state;
1902 int err = 0;
1903
1904 mutex_lock(&qp->mutex);
1905
1906 if (qp->state == IB_QPS_RESET) {
1907 qp_attr->qp_state = IB_QPS_RESET;
1908 goto done;
1909 }
1910
1911 err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
1912 if (err) {
1913 err = -EINVAL;
1914 goto out;
1915 }
1916
1917 mlx4_state = be32_to_cpu(context.flags) >> 28;
1918
1919 qp->state = to_ib_qp_state(mlx4_state);
1920 qp_attr->qp_state = qp->state;
1921 qp_attr->path_mtu = context.mtu_msgmax >> 5;
1922 qp_attr->path_mig_state =
1923 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
1924 qp_attr->qkey = be32_to_cpu(context.qkey);
1925 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
1926 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff;
1927 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff;
1928 qp_attr->qp_access_flags =
1929 to_ib_qp_access_flags(be32_to_cpu(context.params2));
1930
1931 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
1932 to_ib_ah_attr(dev->dev, &qp_attr->ah_attr, &context.pri_path);
1933 to_ib_ah_attr(dev->dev, &qp_attr->alt_ah_attr, &context.alt_path);
1934 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
1935 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num;
1936 }
1937
1938 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
1939 if (qp_attr->qp_state == IB_QPS_INIT)
1940 qp_attr->port_num = qp->port;
1941 else
1942 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;
1943
1944 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
1945 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;
1946
1947 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);
1948
1949 qp_attr->max_dest_rd_atomic =
1950 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
1951 qp_attr->min_rnr_timer =
1952 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
1953 qp_attr->timeout = context.pri_path.ackto >> 3;
1954 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7;
1955 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7;
1956 qp_attr->alt_timeout = context.alt_path.ackto >> 3;
1957
1958 done:
1959 qp_attr->cur_qp_state = qp_attr->qp_state;
1960 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt;
1961 qp_attr->cap.max_recv_sge = qp->rq.max_gs;
1962
1963 if (!ibqp->uobject) {
1964 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt;
1965 qp_attr->cap.max_send_sge = qp->sq.max_gs;
1966 } else {
1967 qp_attr->cap.max_send_wr = 0;
1968 qp_attr->cap.max_send_sge = 0;
1969 }
1970
1971 /*
1972 * We don't support inline sends for kernel QPs (yet), and we
1973 * don't know what userspace's value should be.
1974 */
1975 qp_attr->cap.max_inline_data = 0;
1976
1977 qp_init_attr->cap = qp_attr->cap;
1978
1979 qp_init_attr->create_flags = 0;
1980 if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK)
1981 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
1982
1983 if (qp->flags & MLX4_IB_QP_LSO)
1984 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
1985
1986 out:
1987 mutex_unlock(&qp->mutex);
1988 return err;
1989 }
Tomato firmware and modifications.