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i2c-eg20t: change timeout value 50msec to 1000msec
[zen-stable.git] / drivers / infiniband / hw / mlx4 / qp.c
blobaa2aefa4236c1295ad53aba2b21422e244974a97
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 #include <linux/netdevice.h>
37
38 #include <rdma/ib_cache.h>
39 #include <rdma/ib_pack.h>
40 #include <rdma/ib_addr.h>
41
42 #include <linux/mlx4/qp.h>
43
44 #include "mlx4_ib.h"
45 #include "user.h"
46
47 enum {
48 MLX4_IB_ACK_REQ_FREQ = 8,
49 };
50
51 enum {
52 MLX4_IB_DEFAULT_SCHED_QUEUE = 0x83,
53 MLX4_IB_DEFAULT_QP0_SCHED_QUEUE = 0x3f,
54 MLX4_IB_LINK_TYPE_IB = 0,
55 MLX4_IB_LINK_TYPE_ETH = 1
56 };
57
58 enum {
59 /*
60 * Largest possible UD header: send with GRH and immediate
61 * data plus 18 bytes for an Ethernet header with VLAN/802.1Q
62 * tag. (LRH would only use 8 bytes, so Ethernet is the
63 * biggest case)
64 */
65 MLX4_IB_UD_HEADER_SIZE = 82,
66 MLX4_IB_LSO_HEADER_SPARE = 128,
67 };
68
69 enum {
70 MLX4_IB_IBOE_ETHERTYPE = 0x8915
71 };
72
73 struct mlx4_ib_sqp {
74 struct mlx4_ib_qp qp;
75 int pkey_index;
76 u32 qkey;
77 u32 send_psn;
78 struct ib_ud_header ud_header;
79 u8 header_buf[MLX4_IB_UD_HEADER_SIZE];
80 };
81
82 enum {
83 MLX4_IB_MIN_SQ_STRIDE = 6,
84 MLX4_IB_CACHE_LINE_SIZE = 64,
85 };
86
87 static const __be32 mlx4_ib_opcode[] = {
88 [IB_WR_SEND] = cpu_to_be32(MLX4_OPCODE_SEND),
89 [IB_WR_LSO] = cpu_to_be32(MLX4_OPCODE_LSO),
90 [IB_WR_SEND_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_SEND_IMM),
91 [IB_WR_RDMA_WRITE] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE),
92 [IB_WR_RDMA_WRITE_WITH_IMM] = cpu_to_be32(MLX4_OPCODE_RDMA_WRITE_IMM),
93 [IB_WR_RDMA_READ] = cpu_to_be32(MLX4_OPCODE_RDMA_READ),
94 [IB_WR_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_ATOMIC_CS),
95 [IB_WR_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_ATOMIC_FA),
96 [IB_WR_SEND_WITH_INV] = cpu_to_be32(MLX4_OPCODE_SEND_INVAL),
97 [IB_WR_LOCAL_INV] = cpu_to_be32(MLX4_OPCODE_LOCAL_INVAL),
98 [IB_WR_FAST_REG_MR] = cpu_to_be32(MLX4_OPCODE_FMR),
99 [IB_WR_MASKED_ATOMIC_CMP_AND_SWP] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_CS),
100 [IB_WR_MASKED_ATOMIC_FETCH_AND_ADD] = cpu_to_be32(MLX4_OPCODE_MASKED_ATOMIC_FA),
101 };
102
103 static struct mlx4_ib_sqp *to_msqp(struct mlx4_ib_qp *mqp)
104 {
105 return container_of(mqp, struct mlx4_ib_sqp, qp);
106 }
107
108 static int is_sqp(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
109 {
110 return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
111 qp->mqp.qpn <= dev->dev->caps.sqp_start + 3;
112 }
113
114 static int is_qp0(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
115 {
116 return qp->mqp.qpn >= dev->dev->caps.sqp_start &&
117 qp->mqp.qpn <= dev->dev->caps.sqp_start + 1;
118 }
119
120 static void *get_wqe(struct mlx4_ib_qp *qp, int offset)
121 {
122 return mlx4_buf_offset(&qp->buf, offset);
123 }
124
125 static void *get_recv_wqe(struct mlx4_ib_qp *qp, int n)
126 {
127 return get_wqe(qp, qp->rq.offset + (n << qp->rq.wqe_shift));
128 }
129
130 static void *get_send_wqe(struct mlx4_ib_qp *qp, int n)
131 {
132 return get_wqe(qp, qp->sq.offset + (n << qp->sq.wqe_shift));
133 }
134
135 /*
136 * Stamp a SQ WQE so that it is invalid if prefetched by marking the
137 * first four bytes of every 64 byte chunk with
138 * 0x7FFFFFF | (invalid_ownership_value << 31).
139 *
140 * When the max work request size is less than or equal to the WQE
141 * basic block size, as an optimization, we can stamp all WQEs with
142 * 0xffffffff, and skip the very first chunk of each WQE.
143 */
144 static void stamp_send_wqe(struct mlx4_ib_qp *qp, int n, int size)
145 {
146 __be32 *wqe;
147 int i;
148 int s;
149 int ind;
150 void *buf;
151 __be32 stamp;
152 struct mlx4_wqe_ctrl_seg *ctrl;
153
154 if (qp->sq_max_wqes_per_wr > 1) {
155 s = roundup(size, 1U << qp->sq.wqe_shift);
156 for (i = 0; i < s; i += 64) {
157 ind = (i >> qp->sq.wqe_shift) + n;
158 stamp = ind & qp->sq.wqe_cnt ? cpu_to_be32(0x7fffffff) :
159 cpu_to_be32(0xffffffff);
160 buf = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
161 wqe = buf + (i & ((1 << qp->sq.wqe_shift) - 1));
162 *wqe = stamp;
163 }
164 } else {
165 ctrl = buf = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
166 s = (ctrl->fence_size & 0x3f) << 4;
167 for (i = 64; i < s; i += 64) {
168 wqe = buf + i;
169 *wqe = cpu_to_be32(0xffffffff);
170 }
171 }
172 }
173
174 static void post_nop_wqe(struct mlx4_ib_qp *qp, int n, int size)
175 {
176 struct mlx4_wqe_ctrl_seg *ctrl;
177 struct mlx4_wqe_inline_seg *inl;
178 void *wqe;
179 int s;
180
181 ctrl = wqe = get_send_wqe(qp, n & (qp->sq.wqe_cnt - 1));
182 s = sizeof(struct mlx4_wqe_ctrl_seg);
183
184 if (qp->ibqp.qp_type == IB_QPT_UD) {
185 struct mlx4_wqe_datagram_seg *dgram = wqe + sizeof *ctrl;
186 struct mlx4_av *av = (struct mlx4_av *)dgram->av;
187 memset(dgram, 0, sizeof *dgram);
188 av->port_pd = cpu_to_be32((qp->port << 24) | to_mpd(qp->ibqp.pd)->pdn);
189 s += sizeof(struct mlx4_wqe_datagram_seg);
190 }
191
192 /* Pad the remainder of the WQE with an inline data segment. */
193 if (size > s) {
194 inl = wqe + s;
195 inl->byte_count = cpu_to_be32(1 << 31 | (size - s - sizeof *inl));
196 }
197 ctrl->srcrb_flags = 0;
198 ctrl->fence_size = size / 16;
199 /*
200 * Make sure descriptor is fully written before setting ownership bit
201 * (because HW can start executing as soon as we do).
202 */
203 wmb();
204
205 ctrl->owner_opcode = cpu_to_be32(MLX4_OPCODE_NOP | MLX4_WQE_CTRL_NEC) |
206 (n & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0);
207
208 stamp_send_wqe(qp, n + qp->sq_spare_wqes, size);
209 }
210
211 /* Post NOP WQE to prevent wrap-around in the middle of WR */
212 static inline unsigned pad_wraparound(struct mlx4_ib_qp *qp, int ind)
213 {
214 unsigned s = qp->sq.wqe_cnt - (ind & (qp->sq.wqe_cnt - 1));
215 if (unlikely(s < qp->sq_max_wqes_per_wr)) {
216 post_nop_wqe(qp, ind, s << qp->sq.wqe_shift);
217 ind += s;
218 }
219 return ind;
220 }
221
222 static void mlx4_ib_qp_event(struct mlx4_qp *qp, enum mlx4_event type)
223 {
224 struct ib_event event;
225 struct ib_qp *ibqp = &to_mibqp(qp)->ibqp;
226
227 if (type == MLX4_EVENT_TYPE_PATH_MIG)
228 to_mibqp(qp)->port = to_mibqp(qp)->alt_port;
229
230 if (ibqp->event_handler) {
231 event.device = ibqp->device;
232 event.element.qp = ibqp;
233 switch (type) {
234 case MLX4_EVENT_TYPE_PATH_MIG:
235 event.event = IB_EVENT_PATH_MIG;
236 break;
237 case MLX4_EVENT_TYPE_COMM_EST:
238 event.event = IB_EVENT_COMM_EST;
239 break;
240 case MLX4_EVENT_TYPE_SQ_DRAINED:
241 event.event = IB_EVENT_SQ_DRAINED;
242 break;
243 case MLX4_EVENT_TYPE_SRQ_QP_LAST_WQE:
244 event.event = IB_EVENT_QP_LAST_WQE_REACHED;
245 break;
246 case MLX4_EVENT_TYPE_WQ_CATAS_ERROR:
247 event.event = IB_EVENT_QP_FATAL;
248 break;
249 case MLX4_EVENT_TYPE_PATH_MIG_FAILED:
250 event.event = IB_EVENT_PATH_MIG_ERR;
251 break;
252 case MLX4_EVENT_TYPE_WQ_INVAL_REQ_ERROR:
253 event.event = IB_EVENT_QP_REQ_ERR;
254 break;
255 case MLX4_EVENT_TYPE_WQ_ACCESS_ERROR:
256 event.event = IB_EVENT_QP_ACCESS_ERR;
257 break;
258 default:
259 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
260 "on QP %06x\n", type, qp->qpn);
261 return;
262 }
263
264 ibqp->event_handler(&event, ibqp->qp_context);
265 }
266 }
267
268 static int send_wqe_overhead(enum ib_qp_type type, u32 flags)
269 {
270 /*
271 * UD WQEs must have a datagram segment.
272 * RC and UC WQEs might have a remote address segment.
273 * MLX WQEs need two extra inline data segments (for the UD
274 * header and space for the ICRC).
275 */
276 switch (type) {
277 case IB_QPT_UD:
278 return sizeof (struct mlx4_wqe_ctrl_seg) +
279 sizeof (struct mlx4_wqe_datagram_seg) +
280 ((flags & MLX4_IB_QP_LSO) ? MLX4_IB_LSO_HEADER_SPARE : 0);
281 case IB_QPT_UC:
282 return sizeof (struct mlx4_wqe_ctrl_seg) +
283 sizeof (struct mlx4_wqe_raddr_seg);
284 case IB_QPT_RC:
285 return sizeof (struct mlx4_wqe_ctrl_seg) +
286 sizeof (struct mlx4_wqe_atomic_seg) +
287 sizeof (struct mlx4_wqe_raddr_seg);
288 case IB_QPT_SMI:
289 case IB_QPT_GSI:
290 return sizeof (struct mlx4_wqe_ctrl_seg) +
291 ALIGN(MLX4_IB_UD_HEADER_SIZE +
292 DIV_ROUND_UP(MLX4_IB_UD_HEADER_SIZE,
293 MLX4_INLINE_ALIGN) *
294 sizeof (struct mlx4_wqe_inline_seg),
295 sizeof (struct mlx4_wqe_data_seg)) +
296 ALIGN(4 +
297 sizeof (struct mlx4_wqe_inline_seg),
298 sizeof (struct mlx4_wqe_data_seg));
299 default:
300 return sizeof (struct mlx4_wqe_ctrl_seg);
301 }
302 }
303
304 static int set_rq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
305 int is_user, int has_rq, struct mlx4_ib_qp *qp)
306 {
307 /* Sanity check RQ size before proceeding */
308 if (cap->max_recv_wr > dev->dev->caps.max_wqes ||
309 cap->max_recv_sge > dev->dev->caps.max_rq_sg)
310 return -EINVAL;
311
312 if (!has_rq) {
313 if (cap->max_recv_wr)
314 return -EINVAL;
315
316 qp->rq.wqe_cnt = qp->rq.max_gs = 0;
317 } else {
318 /* HW requires >= 1 RQ entry with >= 1 gather entry */
319 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
320 return -EINVAL;
321
322 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr));
323 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge));
324 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
325 }
326
327 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt;
328 cap->max_recv_sge = qp->rq.max_gs;
329
330 return 0;
331 }
332
333 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
334 enum ib_qp_type type, struct mlx4_ib_qp *qp)
335 {
336 int s;
337
338 /* Sanity check SQ size before proceeding */
339 if (cap->max_send_wr > dev->dev->caps.max_wqes ||
340 cap->max_send_sge > dev->dev->caps.max_sq_sg ||
341 cap->max_inline_data + send_wqe_overhead(type, qp->flags) +
342 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
343 return -EINVAL;
344
345 /*
346 * For MLX transport we need 2 extra S/G entries:
347 * one for the header and one for the checksum at the end
348 */
349 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
350 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
351 return -EINVAL;
352
353 s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg),
354 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) +
355 send_wqe_overhead(type, qp->flags);
356
357 if (s > dev->dev->caps.max_sq_desc_sz)
358 return -EINVAL;
359
360 /*
361 * Hermon supports shrinking WQEs, such that a single work
362 * request can include multiple units of 1 << wqe_shift. This
363 * way, work requests can differ in size, and do not have to
364 * be a power of 2 in size, saving memory and speeding up send
365 * WR posting. Unfortunately, if we do this then the
366 * wqe_index field in CQEs can't be used to look up the WR ID
367 * anymore, so we do this only if selective signaling is off.
368 *
369 * Further, on 32-bit platforms, we can't use vmap() to make
370 * the QP buffer virtually contiguous. Thus we have to use
371 * constant-sized WRs to make sure a WR is always fully within
372 * a single page-sized chunk.
373 *
374 * Finally, we use NOP work requests to pad the end of the
375 * work queue, to avoid wrap-around in the middle of WR. We
376 * set NEC bit to avoid getting completions with error for
377 * these NOP WRs, but since NEC is only supported starting
378 * with firmware 2.2.232, we use constant-sized WRs for older
379 * firmware.
380 *
381 * And, since MLX QPs only support SEND, we use constant-sized
382 * WRs in this case.
383 *
384 * We look for the smallest value of wqe_shift such that the
385 * resulting number of wqes does not exceed device
386 * capabilities.
387 *
388 * We set WQE size to at least 64 bytes, this way stamping
389 * invalidates each WQE.
390 */
391 if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC &&
392 qp->sq_signal_bits && BITS_PER_LONG == 64 &&
393 type != IB_QPT_SMI && type != IB_QPT_GSI)
394 qp->sq.wqe_shift = ilog2(64);
395 else
396 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s));
397
398 for (;;) {
399 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift);
400
401 /*
402 * We need to leave 2 KB + 1 WR of headroom in the SQ to
403 * allow HW to prefetch.
404 */
405 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr;
406 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr *
407 qp->sq_max_wqes_per_wr +
408 qp->sq_spare_wqes);
409
410 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes)
411 break;
412
413 if (qp->sq_max_wqes_per_wr <= 1)
414 return -EINVAL;
415
416 ++qp->sq.wqe_shift;
417 }
418
419 qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz,
420 (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) -
421 send_wqe_overhead(type, qp->flags)) /
422 sizeof (struct mlx4_wqe_data_seg);
423
424 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
425 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
426 if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
427 qp->rq.offset = 0;
428 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
429 } else {
430 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
431 qp->sq.offset = 0;
432 }
433
434 cap->max_send_wr = qp->sq.max_post =
435 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr;
436 cap->max_send_sge = min(qp->sq.max_gs,
437 min(dev->dev->caps.max_sq_sg,
438 dev->dev->caps.max_rq_sg));
439 /* We don't support inline sends for kernel QPs (yet) */
440 cap->max_inline_data = 0;
441
442 return 0;
443 }
444
445 static int set_user_sq_size(struct mlx4_ib_dev *dev,
446 struct mlx4_ib_qp *qp,
447 struct mlx4_ib_create_qp *ucmd)
448 {
449 /* Sanity check SQ size before proceeding */
450 if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes ||
451 ucmd->log_sq_stride >
452 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) ||
453 ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
454 return -EINVAL;
455
456 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count;
457 qp->sq.wqe_shift = ucmd->log_sq_stride;
458
459 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
460 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
461
462 return 0;
463 }
464
465 static int qp_has_rq(struct ib_qp_init_attr *attr)
466 {
467 if (attr->qp_type == IB_QPT_XRC_INI || attr->qp_type == IB_QPT_XRC_TGT)
468 return 0;
469
470 return !attr->srq;
471 }
472
473 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
474 struct ib_qp_init_attr *init_attr,
475 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
476 {
477 int qpn;
478 int err;
479
480 mutex_init(&qp->mutex);
481 spin_lock_init(&qp->sq.lock);
482 spin_lock_init(&qp->rq.lock);
483 INIT_LIST_HEAD(&qp->gid_list);
484
485 qp->state = IB_QPS_RESET;
486 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
487 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
488
489 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, qp_has_rq(init_attr), qp);
490 if (err)
491 goto err;
492
493 if (pd->uobject) {
494 struct mlx4_ib_create_qp ucmd;
495
496 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
497 err = -EFAULT;
498 goto err;
499 }
500
501 qp->sq_no_prefetch = ucmd.sq_no_prefetch;
502
503 err = set_user_sq_size(dev, qp, &ucmd);
504 if (err)
505 goto err;
506
507 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
508 qp->buf_size, 0, 0);
509 if (IS_ERR(qp->umem)) {
510 err = PTR_ERR(qp->umem);
511 goto err;
512 }
513
514 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
515 ilog2(qp->umem->page_size), &qp->mtt);
516 if (err)
517 goto err_buf;
518
519 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
520 if (err)
521 goto err_mtt;
522
523 if (qp_has_rq(init_attr)) {
524 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
525 ucmd.db_addr, &qp->db);
526 if (err)
527 goto err_mtt;
528 }
529 } else {
530 qp->sq_no_prefetch = 0;
531
532 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)
533 qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK;
534
535 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO)
536 qp->flags |= MLX4_IB_QP_LSO;
537
538 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
539 if (err)
540 goto err;
541
542 if (qp_has_rq(init_attr)) {
543 err = mlx4_db_alloc(dev->dev, &qp->db, 0);
544 if (err)
545 goto err;
546
547 *qp->db.db = 0;
548 }
549
550 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
551 err = -ENOMEM;
552 goto err_db;
553 }
554
555 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
556 &qp->mtt);
557 if (err)
558 goto err_buf;
559
560 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
561 if (err)
562 goto err_mtt;
563
564 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
565 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
566
567 if (!qp->sq.wrid || !qp->rq.wrid) {
568 err = -ENOMEM;
569 goto err_wrid;
570 }
571 }
572
573 if (sqpn) {
574 qpn = sqpn;
575 } else {
576 err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn);
577 if (err)
578 goto err_wrid;
579 }
580
581 err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp);
582 if (err)
583 goto err_qpn;
584
585 if (init_attr->qp_type == IB_QPT_XRC_TGT)
586 qp->mqp.qpn |= (1 << 23);
587
588 /*
589 * Hardware wants QPN written in big-endian order (after
590 * shifting) for send doorbell. Precompute this value to save
591 * a little bit when posting sends.
592 */
593 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
594
595 qp->mqp.event = mlx4_ib_qp_event;
596
597 return 0;
598
599 err_qpn:
600 if (!sqpn)
601 mlx4_qp_release_range(dev->dev, qpn, 1);
602
603 err_wrid:
604 if (pd->uobject) {
605 if (qp_has_rq(init_attr))
606 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &qp->db);
607 } else {
608 kfree(qp->sq.wrid);
609 kfree(qp->rq.wrid);
610 }
611
612 err_mtt:
613 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
614
615 err_buf:
616 if (pd->uobject)
617 ib_umem_release(qp->umem);
618 else
619 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
620
621 err_db:
622 if (!pd->uobject && qp_has_rq(init_attr))
623 mlx4_db_free(dev->dev, &qp->db);
624
625 err:
626 return err;
627 }
628
629 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
630 {
631 switch (state) {
632 case IB_QPS_RESET: return MLX4_QP_STATE_RST;
633 case IB_QPS_INIT: return MLX4_QP_STATE_INIT;
634 case IB_QPS_RTR: return MLX4_QP_STATE_RTR;
635 case IB_QPS_RTS: return MLX4_QP_STATE_RTS;
636 case IB_QPS_SQD: return MLX4_QP_STATE_SQD;
637 case IB_QPS_SQE: return MLX4_QP_STATE_SQER;
638 case IB_QPS_ERR: return MLX4_QP_STATE_ERR;
639 default: return -1;
640 }
641 }
642
643 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
644 __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
645 {
646 if (send_cq == recv_cq) {
647 spin_lock_irq(&send_cq->lock);
648 __acquire(&recv_cq->lock);
649 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
650 spin_lock_irq(&send_cq->lock);
651 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
652 } else {
653 spin_lock_irq(&recv_cq->lock);
654 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
655 }
656 }
657
658 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
659 __releases(&send_cq->lock) __releases(&recv_cq->lock)
660 {
661 if (send_cq == recv_cq) {
662 __release(&recv_cq->lock);
663 spin_unlock_irq(&send_cq->lock);
664 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
665 spin_unlock(&recv_cq->lock);
666 spin_unlock_irq(&send_cq->lock);
667 } else {
668 spin_unlock(&send_cq->lock);
669 spin_unlock_irq(&recv_cq->lock);
670 }
671 }
672
673 static void del_gid_entries(struct mlx4_ib_qp *qp)
674 {
675 struct mlx4_ib_gid_entry *ge, *tmp;
676
677 list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
678 list_del(&ge->list);
679 kfree(ge);
680 }
681 }
682
683 static struct mlx4_ib_pd *get_pd(struct mlx4_ib_qp *qp)
684 {
685 if (qp->ibqp.qp_type == IB_QPT_XRC_TGT)
686 return to_mpd(to_mxrcd(qp->ibqp.xrcd)->pd);
687 else
688 return to_mpd(qp->ibqp.pd);
689 }
690
691 static void get_cqs(struct mlx4_ib_qp *qp,
692 struct mlx4_ib_cq **send_cq, struct mlx4_ib_cq **recv_cq)
693 {
694 switch (qp->ibqp.qp_type) {
695 case IB_QPT_XRC_TGT:
696 *send_cq = to_mcq(to_mxrcd(qp->ibqp.xrcd)->cq);
697 *recv_cq = *send_cq;
698 break;
699 case IB_QPT_XRC_INI:
700 *send_cq = to_mcq(qp->ibqp.send_cq);
701 *recv_cq = *send_cq;
702 break;
703 default:
704 *send_cq = to_mcq(qp->ibqp.send_cq);
705 *recv_cq = to_mcq(qp->ibqp.recv_cq);
706 break;
707 }
708 }
709
710 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
711 int is_user)
712 {
713 struct mlx4_ib_cq *send_cq, *recv_cq;
714
715 if (qp->state != IB_QPS_RESET)
716 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
717 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
718 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
719 qp->mqp.qpn);
720
721 get_cqs(qp, &send_cq, &recv_cq);
722
723 mlx4_ib_lock_cqs(send_cq, recv_cq);
724
725 if (!is_user) {
726 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
727 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
728 if (send_cq != recv_cq)
729 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
730 }
731
732 mlx4_qp_remove(dev->dev, &qp->mqp);
733
734 mlx4_ib_unlock_cqs(send_cq, recv_cq);
735
736 mlx4_qp_free(dev->dev, &qp->mqp);
737
738 if (!is_sqp(dev, qp))
739 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1);
740
741 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
742
743 if (is_user) {
744 if (qp->rq.wqe_cnt)
745 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
746 &qp->db);
747 ib_umem_release(qp->umem);
748 } else {
749 kfree(qp->sq.wrid);
750 kfree(qp->rq.wrid);
751 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
752 if (qp->rq.wqe_cnt)
753 mlx4_db_free(dev->dev, &qp->db);
754 }
755
756 del_gid_entries(qp);
757 }
758
759 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
760 struct ib_qp_init_attr *init_attr,
761 struct ib_udata *udata)
762 {
763 struct mlx4_ib_sqp *sqp;
764 struct mlx4_ib_qp *qp;
765 int err;
766 u16 xrcdn = 0;
767
768 /*
769 * We only support LSO and multicast loopback blocking, and
770 * only for kernel UD QPs.
771 */
772 if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO |
773 IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK))
774 return ERR_PTR(-EINVAL);
775
776 if (init_attr->create_flags &&
777 (udata || init_attr->qp_type != IB_QPT_UD))
778 return ERR_PTR(-EINVAL);
779
780 switch (init_attr->qp_type) {
781 case IB_QPT_XRC_TGT:
782 pd = to_mxrcd(init_attr->xrcd)->pd;
783 xrcdn = to_mxrcd(init_attr->xrcd)->xrcdn;
784 init_attr->send_cq = to_mxrcd(init_attr->xrcd)->cq;
785 /* fall through */
786 case IB_QPT_XRC_INI:
787 if (!(to_mdev(pd->device)->dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC))
788 return ERR_PTR(-ENOSYS);
789 init_attr->recv_cq = init_attr->send_cq;
790 /* fall through */
791 case IB_QPT_RC:
792 case IB_QPT_UC:
793 case IB_QPT_UD:
794 {
795 qp = kzalloc(sizeof *qp, GFP_KERNEL);
796 if (!qp)
797 return ERR_PTR(-ENOMEM);
798
799 err = create_qp_common(to_mdev(pd->device), pd, init_attr, udata, 0, qp);
800 if (err) {
801 kfree(qp);
802 return ERR_PTR(err);
803 }
804
805 qp->ibqp.qp_num = qp->mqp.qpn;
806 qp->xrcdn = xrcdn;
807
808 break;
809 }
810 case IB_QPT_SMI:
811 case IB_QPT_GSI:
812 {
813 /* Userspace is not allowed to create special QPs: */
814 if (udata)
815 return ERR_PTR(-EINVAL);
816
817 sqp = kzalloc(sizeof *sqp, GFP_KERNEL);
818 if (!sqp)
819 return ERR_PTR(-ENOMEM);
820
821 qp = &sqp->qp;
822
823 err = create_qp_common(to_mdev(pd->device), pd, init_attr, udata,
824 to_mdev(pd->device)->dev->caps.sqp_start +
825 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
826 init_attr->port_num - 1,
827 qp);
828 if (err) {
829 kfree(sqp);
830 return ERR_PTR(err);
831 }
832
833 qp->port = init_attr->port_num;
834 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
835
836 break;
837 }
838 default:
839 /* Don't support raw QPs */
840 return ERR_PTR(-EINVAL);
841 }
842
843 return &qp->ibqp;
844 }
845
846 int mlx4_ib_destroy_qp(struct ib_qp *qp)
847 {
848 struct mlx4_ib_dev *dev = to_mdev(qp->device);
849 struct mlx4_ib_qp *mqp = to_mqp(qp);
850 struct mlx4_ib_pd *pd;
851
852 if (is_qp0(dev, mqp))
853 mlx4_CLOSE_PORT(dev->dev, mqp->port);
854
855 pd = get_pd(mqp);
856 destroy_qp_common(dev, mqp, !!pd->ibpd.uobject);
857
858 if (is_sqp(dev, mqp))
859 kfree(to_msqp(mqp));
860 else
861 kfree(mqp);
862
863 return 0;
864 }
865
866 static int to_mlx4_st(enum ib_qp_type type)
867 {
868 switch (type) {
869 case IB_QPT_RC: return MLX4_QP_ST_RC;
870 case IB_QPT_UC: return MLX4_QP_ST_UC;
871 case IB_QPT_UD: return MLX4_QP_ST_UD;
872 case IB_QPT_XRC_INI:
873 case IB_QPT_XRC_TGT: return MLX4_QP_ST_XRC;
874 case IB_QPT_SMI:
875 case IB_QPT_GSI: return MLX4_QP_ST_MLX;
876 default: return -1;
877 }
878 }
879
880 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
881 int attr_mask)
882 {
883 u8 dest_rd_atomic;
884 u32 access_flags;
885 u32 hw_access_flags = 0;
886
887 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
888 dest_rd_atomic = attr->max_dest_rd_atomic;
889 else
890 dest_rd_atomic = qp->resp_depth;
891
892 if (attr_mask & IB_QP_ACCESS_FLAGS)
893 access_flags = attr->qp_access_flags;
894 else
895 access_flags = qp->atomic_rd_en;
896
897 if (!dest_rd_atomic)
898 access_flags &= IB_ACCESS_REMOTE_WRITE;
899
900 if (access_flags & IB_ACCESS_REMOTE_READ)
901 hw_access_flags |= MLX4_QP_BIT_RRE;
902 if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
903 hw_access_flags |= MLX4_QP_BIT_RAE;
904 if (access_flags & IB_ACCESS_REMOTE_WRITE)
905 hw_access_flags |= MLX4_QP_BIT_RWE;
906
907 return cpu_to_be32(hw_access_flags);
908 }
909
910 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
911 int attr_mask)
912 {
913 if (attr_mask & IB_QP_PKEY_INDEX)
914 sqp->pkey_index = attr->pkey_index;
915 if (attr_mask & IB_QP_QKEY)
916 sqp->qkey = attr->qkey;
917 if (attr_mask & IB_QP_SQ_PSN)
918 sqp->send_psn = attr->sq_psn;
919 }
920
921 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
922 {
923 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
924 }
925
926 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
927 struct mlx4_qp_path *path, u8 port)
928 {
929 int err;
930 int is_eth = rdma_port_get_link_layer(&dev->ib_dev, port) ==
931 IB_LINK_LAYER_ETHERNET;
932 u8 mac[6];
933 int is_mcast;
934 u16 vlan_tag;
935 int vidx;
936
937 path->grh_mylmc = ah->src_path_bits & 0x7f;
938 path->rlid = cpu_to_be16(ah->dlid);
939 if (ah->static_rate) {
940 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
941 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
942 !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
943 --path->static_rate;
944 } else
945 path->static_rate = 0;
946
947 if (ah->ah_flags & IB_AH_GRH) {
948 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
949 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
950 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
951 return -1;
952 }
953
954 path->grh_mylmc |= 1 << 7;
955 path->mgid_index = ah->grh.sgid_index;
956 path->hop_limit = ah->grh.hop_limit;
957 path->tclass_flowlabel =
958 cpu_to_be32((ah->grh.traffic_class << 20) |
959 (ah->grh.flow_label));
960 memcpy(path->rgid, ah->grh.dgid.raw, 16);
961 }
962
963 if (is_eth) {
964 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
965 ((port - 1) << 6) | ((ah->sl & 7) << 3);
966
967 if (!(ah->ah_flags & IB_AH_GRH))
968 return -1;
969
970 err = mlx4_ib_resolve_grh(dev, ah, mac, &is_mcast, port);
971 if (err)
972 return err;
973
974 memcpy(path->dmac, mac, 6);
975 path->ackto = MLX4_IB_LINK_TYPE_ETH;
976 /* use index 0 into MAC table for IBoE */
977 path->grh_mylmc &= 0x80;
978
979 vlan_tag = rdma_get_vlan_id(&dev->iboe.gid_table[port - 1][ah->grh.sgid_index]);
980 if (vlan_tag < 0x1000) {
981 if (mlx4_find_cached_vlan(dev->dev, port, vlan_tag, &vidx))
982 return -ENOENT;
983
984 path->vlan_index = vidx;
985 path->fl = 1 << 6;
986 }
987 } else
988 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
989 ((port - 1) << 6) | ((ah->sl & 0xf) << 2);
990
991 return 0;
992 }
993
994 static void update_mcg_macs(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
995 {
996 struct mlx4_ib_gid_entry *ge, *tmp;
997
998 list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
999 if (!ge->added && mlx4_ib_add_mc(dev, qp, &ge->gid)) {
1000 ge->added = 1;
1001 ge->port = qp->port;
1002 }
1003 }
1004 }
1005
1006 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
1007 const struct ib_qp_attr *attr, int attr_mask,
1008 enum ib_qp_state cur_state, enum ib_qp_state new_state)
1009 {
1010 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1011 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1012 struct mlx4_ib_pd *pd;
1013 struct mlx4_ib_cq *send_cq, *recv_cq;
1014 struct mlx4_qp_context *context;
1015 enum mlx4_qp_optpar optpar = 0;
1016 int sqd_event;
1017 int err = -EINVAL;
1018
1019 context = kzalloc(sizeof *context, GFP_KERNEL);
1020 if (!context)
1021 return -ENOMEM;
1022
1023 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
1024 (to_mlx4_st(ibqp->qp_type) << 16));
1025
1026 if (!(attr_mask & IB_QP_PATH_MIG_STATE))
1027 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
1028 else {
1029 optpar |= MLX4_QP_OPTPAR_PM_STATE;
1030 switch (attr->path_mig_state) {
1031 case IB_MIG_MIGRATED:
1032 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
1033 break;
1034 case IB_MIG_REARM:
1035 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
1036 break;
1037 case IB_MIG_ARMED:
1038 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
1039 break;
1040 }
1041 }
1042
1043 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI)
1044 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
1045 else if (ibqp->qp_type == IB_QPT_UD) {
1046 if (qp->flags & MLX4_IB_QP_LSO)
1047 context->mtu_msgmax = (IB_MTU_4096 << 5) |
1048 ilog2(dev->dev->caps.max_gso_sz);
1049 else
1050 context->mtu_msgmax = (IB_MTU_4096 << 5) | 12;
1051 } else if (attr_mask & IB_QP_PATH_MTU) {
1052 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
1053 printk(KERN_ERR "path MTU (%u) is invalid\n",
1054 attr->path_mtu);
1055 goto out;
1056 }
1057 context->mtu_msgmax = (attr->path_mtu << 5) |
1058 ilog2(dev->dev->caps.max_msg_sz);
1059 }
1060
1061 if (qp->rq.wqe_cnt)
1062 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
1063 context->rq_size_stride |= qp->rq.wqe_shift - 4;
1064
1065 if (qp->sq.wqe_cnt)
1066 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
1067 context->sq_size_stride |= qp->sq.wqe_shift - 4;
1068
1069 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1070 context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
1071 context->xrcd = cpu_to_be32((u32) qp->xrcdn);
1072 }
1073
1074 if (qp->ibqp.uobject)
1075 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
1076 else
1077 context->usr_page = cpu_to_be32(dev->priv_uar.index);
1078
1079 if (attr_mask & IB_QP_DEST_QPN)
1080 context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
1081
1082 if (attr_mask & IB_QP_PORT) {
1083 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
1084 !(attr_mask & IB_QP_AV)) {
1085 mlx4_set_sched(&context->pri_path, attr->port_num);
1086 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
1087 }
1088 }
1089
1090 if (cur_state == IB_QPS_INIT && new_state == IB_QPS_RTR) {
1091 if (dev->counters[qp->port - 1] != -1) {
1092 context->pri_path.counter_index =
1093 dev->counters[qp->port - 1];
1094 optpar |= MLX4_QP_OPTPAR_COUNTER_INDEX;
1095 } else
1096 context->pri_path.counter_index = 0xff;
1097 }
1098
1099 if (attr_mask & IB_QP_PKEY_INDEX) {
1100 context->pri_path.pkey_index = attr->pkey_index;
1101 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
1102 }
1103
1104 if (attr_mask & IB_QP_AV) {
1105 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
1106 attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
1107 goto out;
1108
1109 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
1110 MLX4_QP_OPTPAR_SCHED_QUEUE);
1111 }
1112
1113 if (attr_mask & IB_QP_TIMEOUT) {
1114 context->pri_path.ackto |= attr->timeout << 3;
1115 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
1116 }
1117
1118 if (attr_mask & IB_QP_ALT_PATH) {
1119 if (attr->alt_port_num == 0 ||
1120 attr->alt_port_num > dev->dev->caps.num_ports)
1121 goto out;
1122
1123 if (attr->alt_pkey_index >=
1124 dev->dev->caps.pkey_table_len[attr->alt_port_num])
1125 goto out;
1126
1127 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
1128 attr->alt_port_num))
1129 goto out;
1130
1131 context->alt_path.pkey_index = attr->alt_pkey_index;
1132 context->alt_path.ackto = attr->alt_timeout << 3;
1133 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
1134 }
1135
1136 pd = get_pd(qp);
1137 get_cqs(qp, &send_cq, &recv_cq);
1138 context->pd = cpu_to_be32(pd->pdn);
1139 context->cqn_send = cpu_to_be32(send_cq->mcq.cqn);
1140 context->cqn_recv = cpu_to_be32(recv_cq->mcq.cqn);
1141 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
1142
1143 /* Set "fast registration enabled" for all kernel QPs */
1144 if (!qp->ibqp.uobject)
1145 context->params1 |= cpu_to_be32(1 << 11);
1146
1147 if (attr_mask & IB_QP_RNR_RETRY) {
1148 context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
1149 optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
1150 }
1151
1152 if (attr_mask & IB_QP_RETRY_CNT) {
1153 context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
1154 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
1155 }
1156
1157 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
1158 if (attr->max_rd_atomic)
1159 context->params1 |=
1160 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
1161 optpar |= MLX4_QP_OPTPAR_SRA_MAX;
1162 }
1163
1164 if (attr_mask & IB_QP_SQ_PSN)
1165 context->next_send_psn = cpu_to_be32(attr->sq_psn);
1166
1167 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
1168 if (attr->max_dest_rd_atomic)
1169 context->params2 |=
1170 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
1171 optpar |= MLX4_QP_OPTPAR_RRA_MAX;
1172 }
1173
1174 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
1175 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
1176 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
1177 }
1178
1179 if (ibqp->srq)
1180 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
1181
1182 if (attr_mask & IB_QP_MIN_RNR_TIMER) {
1183 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
1184 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
1185 }
1186 if (attr_mask & IB_QP_RQ_PSN)
1187 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
1188
1189 if (attr_mask & IB_QP_QKEY) {
1190 context->qkey = cpu_to_be32(attr->qkey);
1191 optpar |= MLX4_QP_OPTPAR_Q_KEY;
1192 }
1193
1194 if (ibqp->srq)
1195 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
1196
1197 if (qp->rq.wqe_cnt && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1198 context->db_rec_addr = cpu_to_be64(qp->db.dma);
1199
1200 if (cur_state == IB_QPS_INIT &&
1201 new_state == IB_QPS_RTR &&
1202 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
1203 ibqp->qp_type == IB_QPT_UD)) {
1204 context->pri_path.sched_queue = (qp->port - 1) << 6;
1205 if (is_qp0(dev, qp))
1206 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
1207 else
1208 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
1209 }
1210
1211 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD &&
1212 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
1213 sqd_event = 1;
1214 else
1215 sqd_event = 0;
1216
1217 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1218 context->rlkey |= (1 << 4);
1219
1220 /*
1221 * Before passing a kernel QP to the HW, make sure that the
1222 * ownership bits of the send queue are set and the SQ
1223 * headroom is stamped so that the hardware doesn't start
1224 * processing stale work requests.
1225 */
1226 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1227 struct mlx4_wqe_ctrl_seg *ctrl;
1228 int i;
1229
1230 for (i = 0; i < qp->sq.wqe_cnt; ++i) {
1231 ctrl = get_send_wqe(qp, i);
1232 ctrl->owner_opcode = cpu_to_be32(1 << 31);
1233 if (qp->sq_max_wqes_per_wr == 1)
1234 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4);
1235
1236 stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift);
1237 }
1238 }
1239
1240 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
1241 to_mlx4_state(new_state), context, optpar,
1242 sqd_event, &qp->mqp);
1243 if (err)
1244 goto out;
1245
1246 qp->state = new_state;
1247
1248 if (attr_mask & IB_QP_ACCESS_FLAGS)
1249 qp->atomic_rd_en = attr->qp_access_flags;
1250 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
1251 qp->resp_depth = attr->max_dest_rd_atomic;
1252 if (attr_mask & IB_QP_PORT) {
1253 qp->port = attr->port_num;
1254 update_mcg_macs(dev, qp);
1255 }
1256 if (attr_mask & IB_QP_ALT_PATH)
1257 qp->alt_port = attr->alt_port_num;
1258
1259 if (is_sqp(dev, qp))
1260 store_sqp_attrs(to_msqp(qp), attr, attr_mask);
1261
1262 /*
1263 * If we moved QP0 to RTR, bring the IB link up; if we moved
1264 * QP0 to RESET or ERROR, bring the link back down.
1265 */
1266 if (is_qp0(dev, qp)) {
1267 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
1268 if (mlx4_INIT_PORT(dev->dev, qp->port))
1269 printk(KERN_WARNING "INIT_PORT failed for port %d\n",
1270 qp->port);
1271
1272 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
1273 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
1274 mlx4_CLOSE_PORT(dev->dev, qp->port);
1275 }
1276
1277 /*
1278 * If we moved a kernel QP to RESET, clean up all old CQ
1279 * entries and reinitialize the QP.
1280 */
1281 if (new_state == IB_QPS_RESET && !ibqp->uobject) {
1282 mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
1283 ibqp->srq ? to_msrq(ibqp->srq): NULL);
1284 if (send_cq != recv_cq)
1285 mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
1286
1287 qp->rq.head = 0;
1288 qp->rq.tail = 0;
1289 qp->sq.head = 0;
1290 qp->sq.tail = 0;
1291 qp->sq_next_wqe = 0;
1292 if (qp->rq.wqe_cnt)
1293 *qp->db.db = 0;
1294 }
1295
1296 out:
1297 kfree(context);
1298 return err;
1299 }
1300
1301 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
1302 int attr_mask, struct ib_udata *udata)
1303 {
1304 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1305 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1306 enum ib_qp_state cur_state, new_state;
1307 int err = -EINVAL;
1308
1309 mutex_lock(&qp->mutex);
1310
1311 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
1312 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
1313
1314 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
1315 goto out;
1316
1317 if ((attr_mask & IB_QP_PORT) &&
1318 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
1319 goto out;
1320 }
1321
1322 if (attr_mask & IB_QP_PKEY_INDEX) {
1323 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
1324 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p])
1325 goto out;
1326 }
1327
1328 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
1329 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
1330 goto out;
1331 }
1332
1333 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
1334 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
1335 goto out;
1336 }
1337
1338 if (cur_state == new_state && cur_state == IB_QPS_RESET) {
1339 err = 0;
1340 goto out;
1341 }
1342
1343 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
1344
1345 out:
1346 mutex_unlock(&qp->mutex);
1347 return err;
1348 }
1349
1350 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
1351 void *wqe, unsigned *mlx_seg_len)
1352 {
1353 struct ib_device *ib_dev = sqp->qp.ibqp.device;
1354 struct mlx4_wqe_mlx_seg *mlx = wqe;
1355 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1356 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1357 union ib_gid sgid;
1358 u16 pkey;
1359 int send_size;
1360 int header_size;
1361 int spc;
1362 int i;
1363 int is_eth;
1364 int is_vlan = 0;
1365 int is_grh;
1366 u16 vlan;
1367
1368 send_size = 0;
1369 for (i = 0; i < wr->num_sge; ++i)
1370 send_size += wr->sg_list[i].length;
1371
1372 is_eth = rdma_port_get_link_layer(sqp->qp.ibqp.device, sqp->qp.port) == IB_LINK_LAYER_ETHERNET;
1373 is_grh = mlx4_ib_ah_grh_present(ah);
1374 if (is_eth) {
1375 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24,
1376 ah->av.ib.gid_index, &sgid);
1377 vlan = rdma_get_vlan_id(&sgid);
1378 is_vlan = vlan < 0x1000;
1379 }
1380 ib_ud_header_init(send_size, !is_eth, is_eth, is_vlan, is_grh, 0, &sqp->ud_header);
1381
1382 if (!is_eth) {
1383 sqp->ud_header.lrh.service_level =
1384 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
1385 sqp->ud_header.lrh.destination_lid = ah->av.ib.dlid;
1386 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.ib.g_slid & 0x7f);
1387 }
1388
1389 if (is_grh) {
1390 sqp->ud_header.grh.traffic_class =
1391 (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20) & 0xff;
1392 sqp->ud_header.grh.flow_label =
1393 ah->av.ib.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
1394 sqp->ud_header.grh.hop_limit = ah->av.ib.hop_limit;
1395 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24,
1396 ah->av.ib.gid_index, &sqp->ud_header.grh.source_gid);
1397 memcpy(sqp->ud_header.grh.destination_gid.raw,
1398 ah->av.ib.dgid, 16);
1399 }
1400
1401 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1402
1403 if (!is_eth) {
1404 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
1405 (sqp->ud_header.lrh.destination_lid ==
1406 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
1407 (sqp->ud_header.lrh.service_level << 8));
1408 mlx->rlid = sqp->ud_header.lrh.destination_lid;
1409 }
1410
1411 switch (wr->opcode) {
1412 case IB_WR_SEND:
1413 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1414 sqp->ud_header.immediate_present = 0;
1415 break;
1416 case IB_WR_SEND_WITH_IMM:
1417 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1418 sqp->ud_header.immediate_present = 1;
1419 sqp->ud_header.immediate_data = wr->ex.imm_data;
1420 break;
1421 default:
1422 return -EINVAL;
1423 }
1424
1425 if (is_eth) {
1426 u8 *smac;
1427
1428 memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6);
1429 /* FIXME: cache smac value? */
1430 smac = to_mdev(sqp->qp.ibqp.device)->iboe.netdevs[sqp->qp.port - 1]->dev_addr;
1431 memcpy(sqp->ud_header.eth.smac_h, smac, 6);
1432 if (!memcmp(sqp->ud_header.eth.smac_h, sqp->ud_header.eth.dmac_h, 6))
1433 mlx->flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);
1434 if (!is_vlan) {
1435 sqp->ud_header.eth.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1436 } else {
1437 u16 pcp;
1438
1439 sqp->ud_header.vlan.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1440 pcp = (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 29) << 13;
1441 sqp->ud_header.vlan.tag = cpu_to_be16(vlan | pcp);
1442 }
1443 } else {
1444 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0;
1445 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1446 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1447 }
1448 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1449 if (!sqp->qp.ibqp.qp_num)
1450 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
1451 else
1452 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
1453 sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1454 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1455 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1456 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1457 sqp->qkey : wr->wr.ud.remote_qkey);
1458 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1459
1460 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1461
1462 if (0) {
1463 printk(KERN_ERR "built UD header of size %d:\n", header_size);
1464 for (i = 0; i < header_size / 4; ++i) {
1465 if (i % 8 == 0)
1466 printk(" [%02x] ", i * 4);
1467 printk(" %08x",
1468 be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
1469 if ((i + 1) % 8 == 0)
1470 printk("\n");
1471 }
1472 printk("\n");
1473 }
1474
1475 /*
1476 * Inline data segments may not cross a 64 byte boundary. If
1477 * our UD header is bigger than the space available up to the
1478 * next 64 byte boundary in the WQE, use two inline data
1479 * segments to hold the UD header.
1480 */
1481 spc = MLX4_INLINE_ALIGN -
1482 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1483 if (header_size <= spc) {
1484 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1485 memcpy(inl + 1, sqp->header_buf, header_size);
1486 i = 1;
1487 } else {
1488 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1489 memcpy(inl + 1, sqp->header_buf, spc);
1490
1491 inl = (void *) (inl + 1) + spc;
1492 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1493 /*
1494 * Need a barrier here to make sure all the data is
1495 * visible before the byte_count field is set.
1496 * Otherwise the HCA prefetcher could grab the 64-byte
1497 * chunk with this inline segment and get a valid (!=
1498 * 0xffffffff) byte count but stale data, and end up
1499 * generating a packet with bad headers.
1500 *
1501 * The first inline segment's byte_count field doesn't
1502 * need a barrier, because it comes after a
1503 * control/MLX segment and therefore is at an offset
1504 * of 16 mod 64.
1505 */
1506 wmb();
1507 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1508 i = 2;
1509 }
1510
1511 *mlx_seg_len =
1512 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1513 return 0;
1514 }
1515
1516 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
1517 {
1518 unsigned cur;
1519 struct mlx4_ib_cq *cq;
1520
1521 cur = wq->head - wq->tail;
1522 if (likely(cur + nreq < wq->max_post))
1523 return 0;
1524
1525 cq = to_mcq(ib_cq);
1526 spin_lock(&cq->lock);
1527 cur = wq->head - wq->tail;
1528 spin_unlock(&cq->lock);
1529
1530 return cur + nreq >= wq->max_post;
1531 }
1532
1533 static __be32 convert_access(int acc)
1534 {
1535 return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC) : 0) |
1536 (acc & IB_ACCESS_REMOTE_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) |
1537 (acc & IB_ACCESS_REMOTE_READ ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ) : 0) |
1538 (acc & IB_ACCESS_LOCAL_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE) : 0) |
1539 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ);
1540 }
1541
1542 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr)
1543 {
1544 struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list);
1545 int i;
1546
1547 for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i)
1548 mfrpl->mapped_page_list[i] =
1549 cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] |
1550 MLX4_MTT_FLAG_PRESENT);
1551
1552 fseg->flags = convert_access(wr->wr.fast_reg.access_flags);
1553 fseg->mem_key = cpu_to_be32(wr->wr.fast_reg.rkey);
1554 fseg->buf_list = cpu_to_be64(mfrpl->map);
1555 fseg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start);
1556 fseg->reg_len = cpu_to_be64(wr->wr.fast_reg.length);
1557 fseg->offset = 0; /* XXX -- is this just for ZBVA? */
1558 fseg->page_size = cpu_to_be32(wr->wr.fast_reg.page_shift);
1559 fseg->reserved[0] = 0;
1560 fseg->reserved[1] = 0;
1561 }
1562
1563 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey)
1564 {
1565 iseg->flags = 0;
1566 iseg->mem_key = cpu_to_be32(rkey);
1567 iseg->guest_id = 0;
1568 iseg->pa = 0;
1569 }
1570
1571 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,
1572 u64 remote_addr, u32 rkey)
1573 {
1574 rseg->raddr = cpu_to_be64(remote_addr);
1575 rseg->rkey = cpu_to_be32(rkey);
1576 rseg->reserved = 0;
1577 }
1578
1579 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr)
1580 {
1581 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1582 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1583 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add);
1584 } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) {
1585 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1586 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1587 } else {
1588 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1589 aseg->compare = 0;
1590 }
1591
1592 }
1593
1594 static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg,
1595 struct ib_send_wr *wr)
1596 {
1597 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1598 aseg->swap_add_mask = cpu_to_be64(wr->wr.atomic.swap_mask);
1599 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add);
1600 aseg->compare_mask = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1601 }
1602
1603 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
1604 struct ib_send_wr *wr)
1605 {
1606 memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
1607 dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1608 dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey);
1609 dseg->vlan = to_mah(wr->wr.ud.ah)->av.eth.vlan;
1610 memcpy(dseg->mac, to_mah(wr->wr.ud.ah)->av.eth.mac, 6);
1611 }
1612
1613 static void set_mlx_icrc_seg(void *dseg)
1614 {
1615 u32 *t = dseg;
1616 struct mlx4_wqe_inline_seg *iseg = dseg;
1617
1618 t[1] = 0;
1619
1620 /*
1621 * Need a barrier here before writing the byte_count field to
1622 * make sure that all the data is visible before the
1623 * byte_count field is set. Otherwise, if the segment begins
1624 * a new cacheline, the HCA prefetcher could grab the 64-byte
1625 * chunk and get a valid (!= * 0xffffffff) byte count but
1626 * stale data, and end up sending the wrong data.
1627 */
1628 wmb();
1629
1630 iseg->byte_count = cpu_to_be32((1 << 31) | 4);
1631 }
1632
1633 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1634 {
1635 dseg->lkey = cpu_to_be32(sg->lkey);
1636 dseg->addr = cpu_to_be64(sg->addr);
1637
1638 /*
1639 * Need a barrier here before writing the byte_count field to
1640 * make sure that all the data is visible before the
1641 * byte_count field is set. Otherwise, if the segment begins
1642 * a new cacheline, the HCA prefetcher could grab the 64-byte
1643 * chunk and get a valid (!= * 0xffffffff) byte count but
1644 * stale data, and end up sending the wrong data.
1645 */
1646 wmb();
1647
1648 dseg->byte_count = cpu_to_be32(sg->length);
1649 }
1650
1651 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1652 {
1653 dseg->byte_count = cpu_to_be32(sg->length);
1654 dseg->lkey = cpu_to_be32(sg->lkey);
1655 dseg->addr = cpu_to_be64(sg->addr);
1656 }
1657
1658 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr,
1659 struct mlx4_ib_qp *qp, unsigned *lso_seg_len,
1660 __be32 *lso_hdr_sz, __be32 *blh)
1661 {
1662 unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16);
1663
1664 if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE))
1665 *blh = cpu_to_be32(1 << 6);
1666
1667 if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) &&
1668 wr->num_sge > qp->sq.max_gs - (halign >> 4)))
1669 return -EINVAL;
1670
1671 memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen);
1672
1673 *lso_hdr_sz = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 |
1674 wr->wr.ud.hlen);
1675 *lso_seg_len = halign;
1676 return 0;
1677 }
1678
1679 static __be32 send_ieth(struct ib_send_wr *wr)
1680 {
1681 switch (wr->opcode) {
1682 case IB_WR_SEND_WITH_IMM:
1683 case IB_WR_RDMA_WRITE_WITH_IMM:
1684 return wr->ex.imm_data;
1685
1686 case IB_WR_SEND_WITH_INV:
1687 return cpu_to_be32(wr->ex.invalidate_rkey);
1688
1689 default:
1690 return 0;
1691 }
1692 }
1693
1694 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1695 struct ib_send_wr **bad_wr)
1696 {
1697 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1698 void *wqe;
1699 struct mlx4_wqe_ctrl_seg *ctrl;
1700 struct mlx4_wqe_data_seg *dseg;
1701 unsigned long flags;
1702 int nreq;
1703 int err = 0;
1704 unsigned ind;
1705 int uninitialized_var(stamp);
1706 int uninitialized_var(size);
1707 unsigned uninitialized_var(seglen);
1708 __be32 dummy;
1709 __be32 *lso_wqe;
1710 __be32 uninitialized_var(lso_hdr_sz);
1711 __be32 blh;
1712 int i;
1713
1714 spin_lock_irqsave(&qp->sq.lock, flags);
1715
1716 ind = qp->sq_next_wqe;
1717
1718 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1719 lso_wqe = &dummy;
1720 blh = 0;
1721
1722 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1723 err = -ENOMEM;
1724 *bad_wr = wr;
1725 goto out;
1726 }
1727
1728 if (unlikely(wr->num_sge > qp->sq.max_gs)) {
1729 err = -EINVAL;
1730 *bad_wr = wr;
1731 goto out;
1732 }
1733
1734 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
1735 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
1736
1737 ctrl->srcrb_flags =
1738 (wr->send_flags & IB_SEND_SIGNALED ?
1739 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
1740 (wr->send_flags & IB_SEND_SOLICITED ?
1741 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
1742 ((wr->send_flags & IB_SEND_IP_CSUM) ?
1743 cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
1744 MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) |
1745 qp->sq_signal_bits;
1746
1747 ctrl->imm = send_ieth(wr);
1748
1749 wqe += sizeof *ctrl;
1750 size = sizeof *ctrl / 16;
1751
1752 switch (ibqp->qp_type) {
1753 case IB_QPT_RC:
1754 case IB_QPT_UC:
1755 switch (wr->opcode) {
1756 case IB_WR_ATOMIC_CMP_AND_SWP:
1757 case IB_WR_ATOMIC_FETCH_AND_ADD:
1758 case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD:
1759 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1760 wr->wr.atomic.rkey);
1761 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1762
1763 set_atomic_seg(wqe, wr);
1764 wqe += sizeof (struct mlx4_wqe_atomic_seg);
1765
1766 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1767 sizeof (struct mlx4_wqe_atomic_seg)) / 16;
1768
1769 break;
1770
1771 case IB_WR_MASKED_ATOMIC_CMP_AND_SWP:
1772 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1773 wr->wr.atomic.rkey);
1774 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1775
1776 set_masked_atomic_seg(wqe, wr);
1777 wqe += sizeof (struct mlx4_wqe_masked_atomic_seg);
1778
1779 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1780 sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16;
1781
1782 break;
1783
1784 case IB_WR_RDMA_READ:
1785 case IB_WR_RDMA_WRITE:
1786 case IB_WR_RDMA_WRITE_WITH_IMM:
1787 set_raddr_seg(wqe, wr->wr.rdma.remote_addr,
1788 wr->wr.rdma.rkey);
1789 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1790 size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
1791 break;
1792
1793 case IB_WR_LOCAL_INV:
1794 ctrl->srcrb_flags |=
1795 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1796 set_local_inv_seg(wqe, wr->ex.invalidate_rkey);
1797 wqe += sizeof (struct mlx4_wqe_local_inval_seg);
1798 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16;
1799 break;
1800
1801 case IB_WR_FAST_REG_MR:
1802 ctrl->srcrb_flags |=
1803 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1804 set_fmr_seg(wqe, wr);
1805 wqe += sizeof (struct mlx4_wqe_fmr_seg);
1806 size += sizeof (struct mlx4_wqe_fmr_seg) / 16;
1807 break;
1808
1809 default:
1810 /* No extra segments required for sends */
1811 break;
1812 }
1813 break;
1814
1815 case IB_QPT_UD:
1816 set_datagram_seg(wqe, wr);
1817 wqe += sizeof (struct mlx4_wqe_datagram_seg);
1818 size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
1819
1820 if (wr->opcode == IB_WR_LSO) {
1821 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh);
1822 if (unlikely(err)) {
1823 *bad_wr = wr;
1824 goto out;
1825 }
1826 lso_wqe = (__be32 *) wqe;
1827 wqe += seglen;
1828 size += seglen / 16;
1829 }
1830 break;
1831
1832 case IB_QPT_SMI:
1833 case IB_QPT_GSI:
1834 err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen);
1835 if (unlikely(err)) {
1836 *bad_wr = wr;
1837 goto out;
1838 }
1839 wqe += seglen;
1840 size += seglen / 16;
1841 break;
1842
1843 default:
1844 break;
1845 }
1846
1847 /*
1848 * Write data segments in reverse order, so as to
1849 * overwrite cacheline stamp last within each
1850 * cacheline. This avoids issues with WQE
1851 * prefetching.
1852 */
1853
1854 dseg = wqe;
1855 dseg += wr->num_sge - 1;
1856 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16);
1857
1858 /* Add one more inline data segment for ICRC for MLX sends */
1859 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI ||
1860 qp->ibqp.qp_type == IB_QPT_GSI)) {
1861 set_mlx_icrc_seg(dseg + 1);
1862 size += sizeof (struct mlx4_wqe_data_seg) / 16;
1863 }
1864
1865 for (i = wr->num_sge - 1; i >= 0; --i, --dseg)
1866 set_data_seg(dseg, wr->sg_list + i);
1867
1868 /*
1869 * Possibly overwrite stamping in cacheline with LSO
1870 * segment only after making sure all data segments
1871 * are written.
1872 */
1873 wmb();
1874 *lso_wqe = lso_hdr_sz;
1875
1876 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
1877 MLX4_WQE_CTRL_FENCE : 0) | size;
1878
1879 /*
1880 * Make sure descriptor is fully written before
1881 * setting ownership bit (because HW can start
1882 * executing as soon as we do).
1883 */
1884 wmb();
1885
1886 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
1887 err = -EINVAL;
1888 goto out;
1889 }
1890
1891 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
1892 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh;
1893
1894 stamp = ind + qp->sq_spare_wqes;
1895 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift);
1896
1897 /*
1898 * We can improve latency by not stamping the last
1899 * send queue WQE until after ringing the doorbell, so
1900 * only stamp here if there are still more WQEs to post.
1901 *
1902 * Same optimization applies to padding with NOP wqe
1903 * in case of WQE shrinking (used to prevent wrap-around
1904 * in the middle of WR).
1905 */
1906 if (wr->next) {
1907 stamp_send_wqe(qp, stamp, size * 16);
1908 ind = pad_wraparound(qp, ind);
1909 }
1910 }
1911
1912 out:
1913 if (likely(nreq)) {
1914 qp->sq.head += nreq;
1915
1916 /*
1917 * Make sure that descriptors are written before
1918 * doorbell record.
1919 */
1920 wmb();
1921
1922 writel(qp->doorbell_qpn,
1923 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
1924
1925 /*
1926 * Make sure doorbells don't leak out of SQ spinlock
1927 * and reach the HCA out of order.
1928 */
1929 mmiowb();
1930
1931 stamp_send_wqe(qp, stamp, size * 16);
1932
1933 ind = pad_wraparound(qp, ind);
1934 qp->sq_next_wqe = ind;
1935 }
1936
1937 spin_unlock_irqrestore(&qp->sq.lock, flags);
1938
1939 return err;
1940 }
1941
1942 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1943 struct ib_recv_wr **bad_wr)
1944 {
1945 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1946 struct mlx4_wqe_data_seg *scat;
1947 unsigned long flags;
1948 int err = 0;
1949 int nreq;
1950 int ind;
1951 int i;
1952
1953 spin_lock_irqsave(&qp->rq.lock, flags);
1954
1955 ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
1956
1957 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1958 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1959 err = -ENOMEM;
1960 *bad_wr = wr;
1961 goto out;
1962 }
1963
1964 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1965 err = -EINVAL;
1966 *bad_wr = wr;
1967 goto out;
1968 }
1969
1970 scat = get_recv_wqe(qp, ind);
1971
1972 for (i = 0; i < wr->num_sge; ++i)
1973 __set_data_seg(scat + i, wr->sg_list + i);
1974
1975 if (i < qp->rq.max_gs) {
1976 scat[i].byte_count = 0;
1977 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
1978 scat[i].addr = 0;
1979 }
1980
1981 qp->rq.wrid[ind] = wr->wr_id;
1982
1983 ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
1984 }
1985
1986 out:
1987 if (likely(nreq)) {
1988 qp->rq.head += nreq;
1989
1990 /*
1991 * Make sure that descriptors are written before
1992 * doorbell record.
1993 */
1994 wmb();
1995
1996 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
1997 }
1998
1999 spin_unlock_irqrestore(&qp->rq.lock, flags);
2000
2001 return err;
2002 }
2003
2004 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
2005 {
2006 switch (mlx4_state) {
2007 case MLX4_QP_STATE_RST: return IB_QPS_RESET;
2008 case MLX4_QP_STATE_INIT: return IB_QPS_INIT;
2009 case MLX4_QP_STATE_RTR: return IB_QPS_RTR;
2010 case MLX4_QP_STATE_RTS: return IB_QPS_RTS;
2011 case MLX4_QP_STATE_SQ_DRAINING:
2012 case MLX4_QP_STATE_SQD: return IB_QPS_SQD;
2013 case MLX4_QP_STATE_SQER: return IB_QPS_SQE;
2014 case MLX4_QP_STATE_ERR: return IB_QPS_ERR;
2015 default: return -1;
2016 }
2017 }
2018
2019 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
2020 {
2021 switch (mlx4_mig_state) {
2022 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED;
2023 case MLX4_QP_PM_REARM: return IB_MIG_REARM;
2024 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED;
2025 default: return -1;
2026 }
2027 }
2028
2029 static int to_ib_qp_access_flags(int mlx4_flags)
2030 {
2031 int ib_flags = 0;
2032
2033 if (mlx4_flags & MLX4_QP_BIT_RRE)
2034 ib_flags |= IB_ACCESS_REMOTE_READ;
2035 if (mlx4_flags & MLX4_QP_BIT_RWE)
2036 ib_flags |= IB_ACCESS_REMOTE_WRITE;
2037 if (mlx4_flags & MLX4_QP_BIT_RAE)
2038 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
2039
2040 return ib_flags;
2041 }
2042
2043 static void to_ib_ah_attr(struct mlx4_ib_dev *ibdev, struct ib_ah_attr *ib_ah_attr,
2044 struct mlx4_qp_path *path)
2045 {
2046 struct mlx4_dev *dev = ibdev->dev;
2047 int is_eth;
2048
2049 memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
2050 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1;
2051
2052 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
2053 return;
2054
2055 is_eth = rdma_port_get_link_layer(&ibdev->ib_dev, ib_ah_attr->port_num) ==
2056 IB_LINK_LAYER_ETHERNET;
2057 if (is_eth)
2058 ib_ah_attr->sl = ((path->sched_queue >> 3) & 0x7) |
2059 ((path->sched_queue & 4) << 1);
2060 else
2061 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf;
2062
2063 ib_ah_attr->dlid = be16_to_cpu(path->rlid);
2064 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
2065 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0;
2066 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
2067 if (ib_ah_attr->ah_flags) {
2068 ib_ah_attr->grh.sgid_index = path->mgid_index;
2069 ib_ah_attr->grh.hop_limit = path->hop_limit;
2070 ib_ah_attr->grh.traffic_class =
2071 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
2072 ib_ah_attr->grh.flow_label =
2073 be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
2074 memcpy(ib_ah_attr->grh.dgid.raw,
2075 path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
2076 }
2077 }
2078
2079 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
2080 struct ib_qp_init_attr *qp_init_attr)
2081 {
2082 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
2083 struct mlx4_ib_qp *qp = to_mqp(ibqp);
2084 struct mlx4_qp_context context;
2085 int mlx4_state;
2086 int err = 0;
2087
2088 mutex_lock(&qp->mutex);
2089
2090 if (qp->state == IB_QPS_RESET) {
2091 qp_attr->qp_state = IB_QPS_RESET;
2092 goto done;
2093 }
2094
2095 err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
2096 if (err) {
2097 err = -EINVAL;
2098 goto out;
2099 }
2100
2101 mlx4_state = be32_to_cpu(context.flags) >> 28;
2102
2103 qp->state = to_ib_qp_state(mlx4_state);
2104 qp_attr->qp_state = qp->state;
2105 qp_attr->path_mtu = context.mtu_msgmax >> 5;
2106 qp_attr->path_mig_state =
2107 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
2108 qp_attr->qkey = be32_to_cpu(context.qkey);
2109 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
2110 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff;
2111 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff;
2112 qp_attr->qp_access_flags =
2113 to_ib_qp_access_flags(be32_to_cpu(context.params2));
2114
2115 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
2116 to_ib_ah_attr(dev, &qp_attr->ah_attr, &context.pri_path);
2117 to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context.alt_path);
2118 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
2119 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num;
2120 }
2121
2122 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
2123 if (qp_attr->qp_state == IB_QPS_INIT)
2124 qp_attr->port_num = qp->port;
2125 else
2126 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;
2127
2128 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
2129 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;
2130
2131 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);
2132
2133 qp_attr->max_dest_rd_atomic =
2134 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
2135 qp_attr->min_rnr_timer =
2136 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
2137 qp_attr->timeout = context.pri_path.ackto >> 3;
2138 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7;
2139 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7;
2140 qp_attr->alt_timeout = context.alt_path.ackto >> 3;
2141
2142 done:
2143 qp_attr->cur_qp_state = qp_attr->qp_state;
2144 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt;
2145 qp_attr->cap.max_recv_sge = qp->rq.max_gs;
2146
2147 if (!ibqp->uobject) {
2148 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt;
2149 qp_attr->cap.max_send_sge = qp->sq.max_gs;
2150 } else {
2151 qp_attr->cap.max_send_wr = 0;
2152 qp_attr->cap.max_send_sge = 0;
2153 }
2154
2155 /*
2156 * We don't support inline sends for kernel QPs (yet), and we
2157 * don't know what userspace's value should be.
2158 */
2159 qp_attr->cap.max_inline_data = 0;
2160
2161 qp_init_attr->cap = qp_attr->cap;
2162
2163 qp_init_attr->create_flags = 0;
2164 if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK)
2165 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
2166
2167 if (qp->flags & MLX4_IB_QP_LSO)
2168 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
2169
2170 out:
2171 mutex_unlock(&qp->mutex);
2172 return err;
2173 }
2174