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Staging: zram: fix up some sysfs attribute permissions
[zen-stable.git] / drivers / infiniband / hw / mlx4 / qp.c
blob9a7794ac34c1ead2f08a9da3078db777ee1ef1ec
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_srq, 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_srq) {
313 /* QPs attached to an SRQ should have no RQ */
314 if (cap->max_recv_wr)
315 return -EINVAL;
316
317 qp->rq.wqe_cnt = qp->rq.max_gs = 0;
318 } else {
319 /* HW requires >= 1 RQ entry with >= 1 gather entry */
320 if (is_user && (!cap->max_recv_wr || !cap->max_recv_sge))
321 return -EINVAL;
322
323 qp->rq.wqe_cnt = roundup_pow_of_two(max(1U, cap->max_recv_wr));
324 qp->rq.max_gs = roundup_pow_of_two(max(1U, cap->max_recv_sge));
325 qp->rq.wqe_shift = ilog2(qp->rq.max_gs * sizeof (struct mlx4_wqe_data_seg));
326 }
327
328 cap->max_recv_wr = qp->rq.max_post = qp->rq.wqe_cnt;
329 cap->max_recv_sge = qp->rq.max_gs;
330
331 return 0;
332 }
333
334 static int set_kernel_sq_size(struct mlx4_ib_dev *dev, struct ib_qp_cap *cap,
335 enum ib_qp_type type, struct mlx4_ib_qp *qp)
336 {
337 int s;
338
339 /* Sanity check SQ size before proceeding */
340 if (cap->max_send_wr > dev->dev->caps.max_wqes ||
341 cap->max_send_sge > dev->dev->caps.max_sq_sg ||
342 cap->max_inline_data + send_wqe_overhead(type, qp->flags) +
343 sizeof (struct mlx4_wqe_inline_seg) > dev->dev->caps.max_sq_desc_sz)
344 return -EINVAL;
345
346 /*
347 * For MLX transport we need 2 extra S/G entries:
348 * one for the header and one for the checksum at the end
349 */
350 if ((type == IB_QPT_SMI || type == IB_QPT_GSI) &&
351 cap->max_send_sge + 2 > dev->dev->caps.max_sq_sg)
352 return -EINVAL;
353
354 s = max(cap->max_send_sge * sizeof (struct mlx4_wqe_data_seg),
355 cap->max_inline_data + sizeof (struct mlx4_wqe_inline_seg)) +
356 send_wqe_overhead(type, qp->flags);
357
358 if (s > dev->dev->caps.max_sq_desc_sz)
359 return -EINVAL;
360
361 /*
362 * Hermon supports shrinking WQEs, such that a single work
363 * request can include multiple units of 1 << wqe_shift. This
364 * way, work requests can differ in size, and do not have to
365 * be a power of 2 in size, saving memory and speeding up send
366 * WR posting. Unfortunately, if we do this then the
367 * wqe_index field in CQEs can't be used to look up the WR ID
368 * anymore, so we do this only if selective signaling is off.
369 *
370 * Further, on 32-bit platforms, we can't use vmap() to make
371 * the QP buffer virtually contiguous. Thus we have to use
372 * constant-sized WRs to make sure a WR is always fully within
373 * a single page-sized chunk.
374 *
375 * Finally, we use NOP work requests to pad the end of the
376 * work queue, to avoid wrap-around in the middle of WR. We
377 * set NEC bit to avoid getting completions with error for
378 * these NOP WRs, but since NEC is only supported starting
379 * with firmware 2.2.232, we use constant-sized WRs for older
380 * firmware.
381 *
382 * And, since MLX QPs only support SEND, we use constant-sized
383 * WRs in this case.
384 *
385 * We look for the smallest value of wqe_shift such that the
386 * resulting number of wqes does not exceed device
387 * capabilities.
388 *
389 * We set WQE size to at least 64 bytes, this way stamping
390 * invalidates each WQE.
391 */
392 if (dev->dev->caps.fw_ver >= MLX4_FW_VER_WQE_CTRL_NEC &&
393 qp->sq_signal_bits && BITS_PER_LONG == 64 &&
394 type != IB_QPT_SMI && type != IB_QPT_GSI)
395 qp->sq.wqe_shift = ilog2(64);
396 else
397 qp->sq.wqe_shift = ilog2(roundup_pow_of_two(s));
398
399 for (;;) {
400 qp->sq_max_wqes_per_wr = DIV_ROUND_UP(s, 1U << qp->sq.wqe_shift);
401
402 /*
403 * We need to leave 2 KB + 1 WR of headroom in the SQ to
404 * allow HW to prefetch.
405 */
406 qp->sq_spare_wqes = (2048 >> qp->sq.wqe_shift) + qp->sq_max_wqes_per_wr;
407 qp->sq.wqe_cnt = roundup_pow_of_two(cap->max_send_wr *
408 qp->sq_max_wqes_per_wr +
409 qp->sq_spare_wqes);
410
411 if (qp->sq.wqe_cnt <= dev->dev->caps.max_wqes)
412 break;
413
414 if (qp->sq_max_wqes_per_wr <= 1)
415 return -EINVAL;
416
417 ++qp->sq.wqe_shift;
418 }
419
420 qp->sq.max_gs = (min(dev->dev->caps.max_sq_desc_sz,
421 (qp->sq_max_wqes_per_wr << qp->sq.wqe_shift)) -
422 send_wqe_overhead(type, qp->flags)) /
423 sizeof (struct mlx4_wqe_data_seg);
424
425 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
426 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
427 if (qp->rq.wqe_shift > qp->sq.wqe_shift) {
428 qp->rq.offset = 0;
429 qp->sq.offset = qp->rq.wqe_cnt << qp->rq.wqe_shift;
430 } else {
431 qp->rq.offset = qp->sq.wqe_cnt << qp->sq.wqe_shift;
432 qp->sq.offset = 0;
433 }
434
435 cap->max_send_wr = qp->sq.max_post =
436 (qp->sq.wqe_cnt - qp->sq_spare_wqes) / qp->sq_max_wqes_per_wr;
437 cap->max_send_sge = min(qp->sq.max_gs,
438 min(dev->dev->caps.max_sq_sg,
439 dev->dev->caps.max_rq_sg));
440 /* We don't support inline sends for kernel QPs (yet) */
441 cap->max_inline_data = 0;
442
443 return 0;
444 }
445
446 static int set_user_sq_size(struct mlx4_ib_dev *dev,
447 struct mlx4_ib_qp *qp,
448 struct mlx4_ib_create_qp *ucmd)
449 {
450 /* Sanity check SQ size before proceeding */
451 if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes ||
452 ucmd->log_sq_stride >
453 ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) ||
454 ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
455 return -EINVAL;
456
457 qp->sq.wqe_cnt = 1 << ucmd->log_sq_bb_count;
458 qp->sq.wqe_shift = ucmd->log_sq_stride;
459
460 qp->buf_size = (qp->rq.wqe_cnt << qp->rq.wqe_shift) +
461 (qp->sq.wqe_cnt << qp->sq.wqe_shift);
462
463 return 0;
464 }
465
466 static int create_qp_common(struct mlx4_ib_dev *dev, struct ib_pd *pd,
467 struct ib_qp_init_attr *init_attr,
468 struct ib_udata *udata, int sqpn, struct mlx4_ib_qp *qp)
469 {
470 int qpn;
471 int err;
472
473 mutex_init(&qp->mutex);
474 spin_lock_init(&qp->sq.lock);
475 spin_lock_init(&qp->rq.lock);
476 INIT_LIST_HEAD(&qp->gid_list);
477
478 qp->state = IB_QPS_RESET;
479 if (init_attr->sq_sig_type == IB_SIGNAL_ALL_WR)
480 qp->sq_signal_bits = cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
481
482 err = set_rq_size(dev, &init_attr->cap, !!pd->uobject, !!init_attr->srq, qp);
483 if (err)
484 goto err;
485
486 if (pd->uobject) {
487 struct mlx4_ib_create_qp ucmd;
488
489 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
490 err = -EFAULT;
491 goto err;
492 }
493
494 qp->sq_no_prefetch = ucmd.sq_no_prefetch;
495
496 err = set_user_sq_size(dev, qp, &ucmd);
497 if (err)
498 goto err;
499
500 qp->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
501 qp->buf_size, 0, 0);
502 if (IS_ERR(qp->umem)) {
503 err = PTR_ERR(qp->umem);
504 goto err;
505 }
506
507 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(qp->umem),
508 ilog2(qp->umem->page_size), &qp->mtt);
509 if (err)
510 goto err_buf;
511
512 err = mlx4_ib_umem_write_mtt(dev, &qp->mtt, qp->umem);
513 if (err)
514 goto err_mtt;
515
516 if (!init_attr->srq) {
517 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
518 ucmd.db_addr, &qp->db);
519 if (err)
520 goto err_mtt;
521 }
522 } else {
523 qp->sq_no_prefetch = 0;
524
525 if (init_attr->create_flags & IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK)
526 qp->flags |= MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK;
527
528 if (init_attr->create_flags & IB_QP_CREATE_IPOIB_UD_LSO)
529 qp->flags |= MLX4_IB_QP_LSO;
530
531 err = set_kernel_sq_size(dev, &init_attr->cap, init_attr->qp_type, qp);
532 if (err)
533 goto err;
534
535 if (!init_attr->srq) {
536 err = mlx4_db_alloc(dev->dev, &qp->db, 0);
537 if (err)
538 goto err;
539
540 *qp->db.db = 0;
541 }
542
543 if (mlx4_buf_alloc(dev->dev, qp->buf_size, PAGE_SIZE * 2, &qp->buf)) {
544 err = -ENOMEM;
545 goto err_db;
546 }
547
548 err = mlx4_mtt_init(dev->dev, qp->buf.npages, qp->buf.page_shift,
549 &qp->mtt);
550 if (err)
551 goto err_buf;
552
553 err = mlx4_buf_write_mtt(dev->dev, &qp->mtt, &qp->buf);
554 if (err)
555 goto err_mtt;
556
557 qp->sq.wrid = kmalloc(qp->sq.wqe_cnt * sizeof (u64), GFP_KERNEL);
558 qp->rq.wrid = kmalloc(qp->rq.wqe_cnt * sizeof (u64), GFP_KERNEL);
559
560 if (!qp->sq.wrid || !qp->rq.wrid) {
561 err = -ENOMEM;
562 goto err_wrid;
563 }
564 }
565
566 if (sqpn) {
567 qpn = sqpn;
568 } else {
569 err = mlx4_qp_reserve_range(dev->dev, 1, 1, &qpn);
570 if (err)
571 goto err_wrid;
572 }
573
574 err = mlx4_qp_alloc(dev->dev, qpn, &qp->mqp);
575 if (err)
576 goto err_qpn;
577
578 /*
579 * Hardware wants QPN written in big-endian order (after
580 * shifting) for send doorbell. Precompute this value to save
581 * a little bit when posting sends.
582 */
583 qp->doorbell_qpn = swab32(qp->mqp.qpn << 8);
584
585 qp->mqp.event = mlx4_ib_qp_event;
586
587 return 0;
588
589 err_qpn:
590 if (!sqpn)
591 mlx4_qp_release_range(dev->dev, qpn, 1);
592
593 err_wrid:
594 if (pd->uobject) {
595 if (!init_attr->srq)
596 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context),
597 &qp->db);
598 } else {
599 kfree(qp->sq.wrid);
600 kfree(qp->rq.wrid);
601 }
602
603 err_mtt:
604 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
605
606 err_buf:
607 if (pd->uobject)
608 ib_umem_release(qp->umem);
609 else
610 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
611
612 err_db:
613 if (!pd->uobject && !init_attr->srq)
614 mlx4_db_free(dev->dev, &qp->db);
615
616 err:
617 return err;
618 }
619
620 static enum mlx4_qp_state to_mlx4_state(enum ib_qp_state state)
621 {
622 switch (state) {
623 case IB_QPS_RESET: return MLX4_QP_STATE_RST;
624 case IB_QPS_INIT: return MLX4_QP_STATE_INIT;
625 case IB_QPS_RTR: return MLX4_QP_STATE_RTR;
626 case IB_QPS_RTS: return MLX4_QP_STATE_RTS;
627 case IB_QPS_SQD: return MLX4_QP_STATE_SQD;
628 case IB_QPS_SQE: return MLX4_QP_STATE_SQER;
629 case IB_QPS_ERR: return MLX4_QP_STATE_ERR;
630 default: return -1;
631 }
632 }
633
634 static void mlx4_ib_lock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
635 __acquires(&send_cq->lock) __acquires(&recv_cq->lock)
636 {
637 if (send_cq == recv_cq) {
638 spin_lock_irq(&send_cq->lock);
639 __acquire(&recv_cq->lock);
640 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
641 spin_lock_irq(&send_cq->lock);
642 spin_lock_nested(&recv_cq->lock, SINGLE_DEPTH_NESTING);
643 } else {
644 spin_lock_irq(&recv_cq->lock);
645 spin_lock_nested(&send_cq->lock, SINGLE_DEPTH_NESTING);
646 }
647 }
648
649 static void mlx4_ib_unlock_cqs(struct mlx4_ib_cq *send_cq, struct mlx4_ib_cq *recv_cq)
650 __releases(&send_cq->lock) __releases(&recv_cq->lock)
651 {
652 if (send_cq == recv_cq) {
653 __release(&recv_cq->lock);
654 spin_unlock_irq(&send_cq->lock);
655 } else if (send_cq->mcq.cqn < recv_cq->mcq.cqn) {
656 spin_unlock(&recv_cq->lock);
657 spin_unlock_irq(&send_cq->lock);
658 } else {
659 spin_unlock(&send_cq->lock);
660 spin_unlock_irq(&recv_cq->lock);
661 }
662 }
663
664 static void del_gid_entries(struct mlx4_ib_qp *qp)
665 {
666 struct mlx4_ib_gid_entry *ge, *tmp;
667
668 list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
669 list_del(&ge->list);
670 kfree(ge);
671 }
672 }
673
674 static void destroy_qp_common(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp,
675 int is_user)
676 {
677 struct mlx4_ib_cq *send_cq, *recv_cq;
678
679 if (qp->state != IB_QPS_RESET)
680 if (mlx4_qp_modify(dev->dev, NULL, to_mlx4_state(qp->state),
681 MLX4_QP_STATE_RST, NULL, 0, 0, &qp->mqp))
682 printk(KERN_WARNING "mlx4_ib: modify QP %06x to RESET failed.\n",
683 qp->mqp.qpn);
684
685 send_cq = to_mcq(qp->ibqp.send_cq);
686 recv_cq = to_mcq(qp->ibqp.recv_cq);
687
688 mlx4_ib_lock_cqs(send_cq, recv_cq);
689
690 if (!is_user) {
691 __mlx4_ib_cq_clean(recv_cq, qp->mqp.qpn,
692 qp->ibqp.srq ? to_msrq(qp->ibqp.srq): NULL);
693 if (send_cq != recv_cq)
694 __mlx4_ib_cq_clean(send_cq, qp->mqp.qpn, NULL);
695 }
696
697 mlx4_qp_remove(dev->dev, &qp->mqp);
698
699 mlx4_ib_unlock_cqs(send_cq, recv_cq);
700
701 mlx4_qp_free(dev->dev, &qp->mqp);
702
703 if (!is_sqp(dev, qp))
704 mlx4_qp_release_range(dev->dev, qp->mqp.qpn, 1);
705
706 mlx4_mtt_cleanup(dev->dev, &qp->mtt);
707
708 if (is_user) {
709 if (!qp->ibqp.srq)
710 mlx4_ib_db_unmap_user(to_mucontext(qp->ibqp.uobject->context),
711 &qp->db);
712 ib_umem_release(qp->umem);
713 } else {
714 kfree(qp->sq.wrid);
715 kfree(qp->rq.wrid);
716 mlx4_buf_free(dev->dev, qp->buf_size, &qp->buf);
717 if (!qp->ibqp.srq)
718 mlx4_db_free(dev->dev, &qp->db);
719 }
720
721 del_gid_entries(qp);
722 }
723
724 struct ib_qp *mlx4_ib_create_qp(struct ib_pd *pd,
725 struct ib_qp_init_attr *init_attr,
726 struct ib_udata *udata)
727 {
728 struct mlx4_ib_dev *dev = to_mdev(pd->device);
729 struct mlx4_ib_sqp *sqp;
730 struct mlx4_ib_qp *qp;
731 int err;
732
733 /*
734 * We only support LSO and multicast loopback blocking, and
735 * only for kernel UD QPs.
736 */
737 if (init_attr->create_flags & ~(IB_QP_CREATE_IPOIB_UD_LSO |
738 IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK))
739 return ERR_PTR(-EINVAL);
740
741 if (init_attr->create_flags &&
742 (pd->uobject || init_attr->qp_type != IB_QPT_UD))
743 return ERR_PTR(-EINVAL);
744
745 switch (init_attr->qp_type) {
746 case IB_QPT_RC:
747 case IB_QPT_UC:
748 case IB_QPT_UD:
749 {
750 qp = kzalloc(sizeof *qp, GFP_KERNEL);
751 if (!qp)
752 return ERR_PTR(-ENOMEM);
753
754 err = create_qp_common(dev, pd, init_attr, udata, 0, qp);
755 if (err) {
756 kfree(qp);
757 return ERR_PTR(err);
758 }
759
760 qp->ibqp.qp_num = qp->mqp.qpn;
761
762 break;
763 }
764 case IB_QPT_SMI:
765 case IB_QPT_GSI:
766 {
767 /* Userspace is not allowed to create special QPs: */
768 if (pd->uobject)
769 return ERR_PTR(-EINVAL);
770
771 sqp = kzalloc(sizeof *sqp, GFP_KERNEL);
772 if (!sqp)
773 return ERR_PTR(-ENOMEM);
774
775 qp = &sqp->qp;
776
777 err = create_qp_common(dev, pd, init_attr, udata,
778 dev->dev->caps.sqp_start +
779 (init_attr->qp_type == IB_QPT_SMI ? 0 : 2) +
780 init_attr->port_num - 1,
781 qp);
782 if (err) {
783 kfree(sqp);
784 return ERR_PTR(err);
785 }
786
787 qp->port = init_attr->port_num;
788 qp->ibqp.qp_num = init_attr->qp_type == IB_QPT_SMI ? 0 : 1;
789
790 break;
791 }
792 default:
793 /* Don't support raw QPs */
794 return ERR_PTR(-EINVAL);
795 }
796
797 return &qp->ibqp;
798 }
799
800 int mlx4_ib_destroy_qp(struct ib_qp *qp)
801 {
802 struct mlx4_ib_dev *dev = to_mdev(qp->device);
803 struct mlx4_ib_qp *mqp = to_mqp(qp);
804
805 if (is_qp0(dev, mqp))
806 mlx4_CLOSE_PORT(dev->dev, mqp->port);
807
808 destroy_qp_common(dev, mqp, !!qp->pd->uobject);
809
810 if (is_sqp(dev, mqp))
811 kfree(to_msqp(mqp));
812 else
813 kfree(mqp);
814
815 return 0;
816 }
817
818 static int to_mlx4_st(enum ib_qp_type type)
819 {
820 switch (type) {
821 case IB_QPT_RC: return MLX4_QP_ST_RC;
822 case IB_QPT_UC: return MLX4_QP_ST_UC;
823 case IB_QPT_UD: return MLX4_QP_ST_UD;
824 case IB_QPT_SMI:
825 case IB_QPT_GSI: return MLX4_QP_ST_MLX;
826 default: return -1;
827 }
828 }
829
830 static __be32 to_mlx4_access_flags(struct mlx4_ib_qp *qp, const struct ib_qp_attr *attr,
831 int attr_mask)
832 {
833 u8 dest_rd_atomic;
834 u32 access_flags;
835 u32 hw_access_flags = 0;
836
837 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
838 dest_rd_atomic = attr->max_dest_rd_atomic;
839 else
840 dest_rd_atomic = qp->resp_depth;
841
842 if (attr_mask & IB_QP_ACCESS_FLAGS)
843 access_flags = attr->qp_access_flags;
844 else
845 access_flags = qp->atomic_rd_en;
846
847 if (!dest_rd_atomic)
848 access_flags &= IB_ACCESS_REMOTE_WRITE;
849
850 if (access_flags & IB_ACCESS_REMOTE_READ)
851 hw_access_flags |= MLX4_QP_BIT_RRE;
852 if (access_flags & IB_ACCESS_REMOTE_ATOMIC)
853 hw_access_flags |= MLX4_QP_BIT_RAE;
854 if (access_flags & IB_ACCESS_REMOTE_WRITE)
855 hw_access_flags |= MLX4_QP_BIT_RWE;
856
857 return cpu_to_be32(hw_access_flags);
858 }
859
860 static void store_sqp_attrs(struct mlx4_ib_sqp *sqp, const struct ib_qp_attr *attr,
861 int attr_mask)
862 {
863 if (attr_mask & IB_QP_PKEY_INDEX)
864 sqp->pkey_index = attr->pkey_index;
865 if (attr_mask & IB_QP_QKEY)
866 sqp->qkey = attr->qkey;
867 if (attr_mask & IB_QP_SQ_PSN)
868 sqp->send_psn = attr->sq_psn;
869 }
870
871 static void mlx4_set_sched(struct mlx4_qp_path *path, u8 port)
872 {
873 path->sched_queue = (path->sched_queue & 0xbf) | ((port - 1) << 6);
874 }
875
876 static int mlx4_set_path(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah,
877 struct mlx4_qp_path *path, u8 port)
878 {
879 int err;
880 int is_eth = rdma_port_get_link_layer(&dev->ib_dev, port) ==
881 IB_LINK_LAYER_ETHERNET;
882 u8 mac[6];
883 int is_mcast;
884 u16 vlan_tag;
885 int vidx;
886
887 path->grh_mylmc = ah->src_path_bits & 0x7f;
888 path->rlid = cpu_to_be16(ah->dlid);
889 if (ah->static_rate) {
890 path->static_rate = ah->static_rate + MLX4_STAT_RATE_OFFSET;
891 while (path->static_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
892 !(1 << path->static_rate & dev->dev->caps.stat_rate_support))
893 --path->static_rate;
894 } else
895 path->static_rate = 0;
896 path->counter_index = 0xff;
897
898 if (ah->ah_flags & IB_AH_GRH) {
899 if (ah->grh.sgid_index >= dev->dev->caps.gid_table_len[port]) {
900 printk(KERN_ERR "sgid_index (%u) too large. max is %d\n",
901 ah->grh.sgid_index, dev->dev->caps.gid_table_len[port] - 1);
902 return -1;
903 }
904
905 path->grh_mylmc |= 1 << 7;
906 path->mgid_index = ah->grh.sgid_index;
907 path->hop_limit = ah->grh.hop_limit;
908 path->tclass_flowlabel =
909 cpu_to_be32((ah->grh.traffic_class << 20) |
910 (ah->grh.flow_label));
911 memcpy(path->rgid, ah->grh.dgid.raw, 16);
912 }
913
914 if (is_eth) {
915 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
916 ((port - 1) << 6) | ((ah->sl & 7) << 3) | ((ah->sl & 8) >> 1);
917
918 if (!(ah->ah_flags & IB_AH_GRH))
919 return -1;
920
921 err = mlx4_ib_resolve_grh(dev, ah, mac, &is_mcast, port);
922 if (err)
923 return err;
924
925 memcpy(path->dmac, mac, 6);
926 path->ackto = MLX4_IB_LINK_TYPE_ETH;
927 /* use index 0 into MAC table for IBoE */
928 path->grh_mylmc &= 0x80;
929
930 vlan_tag = rdma_get_vlan_id(&dev->iboe.gid_table[port - 1][ah->grh.sgid_index]);
931 if (vlan_tag < 0x1000) {
932 if (mlx4_find_cached_vlan(dev->dev, port, vlan_tag, &vidx))
933 return -ENOENT;
934
935 path->vlan_index = vidx;
936 path->fl = 1 << 6;
937 }
938 } else
939 path->sched_queue = MLX4_IB_DEFAULT_SCHED_QUEUE |
940 ((port - 1) << 6) | ((ah->sl & 0xf) << 2);
941
942 return 0;
943 }
944
945 static void update_mcg_macs(struct mlx4_ib_dev *dev, struct mlx4_ib_qp *qp)
946 {
947 struct mlx4_ib_gid_entry *ge, *tmp;
948
949 list_for_each_entry_safe(ge, tmp, &qp->gid_list, list) {
950 if (!ge->added && mlx4_ib_add_mc(dev, qp, &ge->gid)) {
951 ge->added = 1;
952 ge->port = qp->port;
953 }
954 }
955 }
956
957 static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
958 const struct ib_qp_attr *attr, int attr_mask,
959 enum ib_qp_state cur_state, enum ib_qp_state new_state)
960 {
961 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
962 struct mlx4_ib_qp *qp = to_mqp(ibqp);
963 struct mlx4_qp_context *context;
964 enum mlx4_qp_optpar optpar = 0;
965 int sqd_event;
966 int err = -EINVAL;
967
968 context = kzalloc(sizeof *context, GFP_KERNEL);
969 if (!context)
970 return -ENOMEM;
971
972 context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) |
973 (to_mlx4_st(ibqp->qp_type) << 16));
974
975 if (!(attr_mask & IB_QP_PATH_MIG_STATE))
976 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
977 else {
978 optpar |= MLX4_QP_OPTPAR_PM_STATE;
979 switch (attr->path_mig_state) {
980 case IB_MIG_MIGRATED:
981 context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11);
982 break;
983 case IB_MIG_REARM:
984 context->flags |= cpu_to_be32(MLX4_QP_PM_REARM << 11);
985 break;
986 case IB_MIG_ARMED:
987 context->flags |= cpu_to_be32(MLX4_QP_PM_ARMED << 11);
988 break;
989 }
990 }
991
992 if (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI)
993 context->mtu_msgmax = (IB_MTU_4096 << 5) | 11;
994 else if (ibqp->qp_type == IB_QPT_UD) {
995 if (qp->flags & MLX4_IB_QP_LSO)
996 context->mtu_msgmax = (IB_MTU_4096 << 5) |
997 ilog2(dev->dev->caps.max_gso_sz);
998 else
999 context->mtu_msgmax = (IB_MTU_4096 << 5) | 12;
1000 } else if (attr_mask & IB_QP_PATH_MTU) {
1001 if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
1002 printk(KERN_ERR "path MTU (%u) is invalid\n",
1003 attr->path_mtu);
1004 goto out;
1005 }
1006 context->mtu_msgmax = (attr->path_mtu << 5) |
1007 ilog2(dev->dev->caps.max_msg_sz);
1008 }
1009
1010 if (qp->rq.wqe_cnt)
1011 context->rq_size_stride = ilog2(qp->rq.wqe_cnt) << 3;
1012 context->rq_size_stride |= qp->rq.wqe_shift - 4;
1013
1014 if (qp->sq.wqe_cnt)
1015 context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
1016 context->sq_size_stride |= qp->sq.wqe_shift - 4;
1017
1018 if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1019 context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
1020
1021 if (qp->ibqp.uobject)
1022 context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
1023 else
1024 context->usr_page = cpu_to_be32(dev->priv_uar.index);
1025
1026 if (attr_mask & IB_QP_DEST_QPN)
1027 context->remote_qpn = cpu_to_be32(attr->dest_qp_num);
1028
1029 if (attr_mask & IB_QP_PORT) {
1030 if (cur_state == IB_QPS_SQD && new_state == IB_QPS_SQD &&
1031 !(attr_mask & IB_QP_AV)) {
1032 mlx4_set_sched(&context->pri_path, attr->port_num);
1033 optpar |= MLX4_QP_OPTPAR_SCHED_QUEUE;
1034 }
1035 }
1036
1037 if (attr_mask & IB_QP_PKEY_INDEX) {
1038 context->pri_path.pkey_index = attr->pkey_index;
1039 optpar |= MLX4_QP_OPTPAR_PKEY_INDEX;
1040 }
1041
1042 if (attr_mask & IB_QP_AV) {
1043 if (mlx4_set_path(dev, &attr->ah_attr, &context->pri_path,
1044 attr_mask & IB_QP_PORT ? attr->port_num : qp->port))
1045 goto out;
1046
1047 optpar |= (MLX4_QP_OPTPAR_PRIMARY_ADDR_PATH |
1048 MLX4_QP_OPTPAR_SCHED_QUEUE);
1049 }
1050
1051 if (attr_mask & IB_QP_TIMEOUT) {
1052 context->pri_path.ackto |= attr->timeout << 3;
1053 optpar |= MLX4_QP_OPTPAR_ACK_TIMEOUT;
1054 }
1055
1056 if (attr_mask & IB_QP_ALT_PATH) {
1057 if (attr->alt_port_num == 0 ||
1058 attr->alt_port_num > dev->dev->caps.num_ports)
1059 goto out;
1060
1061 if (attr->alt_pkey_index >=
1062 dev->dev->caps.pkey_table_len[attr->alt_port_num])
1063 goto out;
1064
1065 if (mlx4_set_path(dev, &attr->alt_ah_attr, &context->alt_path,
1066 attr->alt_port_num))
1067 goto out;
1068
1069 context->alt_path.pkey_index = attr->alt_pkey_index;
1070 context->alt_path.ackto = attr->alt_timeout << 3;
1071 optpar |= MLX4_QP_OPTPAR_ALT_ADDR_PATH;
1072 }
1073
1074 context->pd = cpu_to_be32(to_mpd(ibqp->pd)->pdn);
1075 context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);
1076
1077 /* Set "fast registration enabled" for all kernel QPs */
1078 if (!qp->ibqp.uobject)
1079 context->params1 |= cpu_to_be32(1 << 11);
1080
1081 if (attr_mask & IB_QP_RNR_RETRY) {
1082 context->params1 |= cpu_to_be32(attr->rnr_retry << 13);
1083 optpar |= MLX4_QP_OPTPAR_RNR_RETRY;
1084 }
1085
1086 if (attr_mask & IB_QP_RETRY_CNT) {
1087 context->params1 |= cpu_to_be32(attr->retry_cnt << 16);
1088 optpar |= MLX4_QP_OPTPAR_RETRY_COUNT;
1089 }
1090
1091 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC) {
1092 if (attr->max_rd_atomic)
1093 context->params1 |=
1094 cpu_to_be32(fls(attr->max_rd_atomic - 1) << 21);
1095 optpar |= MLX4_QP_OPTPAR_SRA_MAX;
1096 }
1097
1098 if (attr_mask & IB_QP_SQ_PSN)
1099 context->next_send_psn = cpu_to_be32(attr->sq_psn);
1100
1101 context->cqn_send = cpu_to_be32(to_mcq(ibqp->send_cq)->mcq.cqn);
1102
1103 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC) {
1104 if (attr->max_dest_rd_atomic)
1105 context->params2 |=
1106 cpu_to_be32(fls(attr->max_dest_rd_atomic - 1) << 21);
1107 optpar |= MLX4_QP_OPTPAR_RRA_MAX;
1108 }
1109
1110 if (attr_mask & (IB_QP_ACCESS_FLAGS | IB_QP_MAX_DEST_RD_ATOMIC)) {
1111 context->params2 |= to_mlx4_access_flags(qp, attr, attr_mask);
1112 optpar |= MLX4_QP_OPTPAR_RWE | MLX4_QP_OPTPAR_RRE | MLX4_QP_OPTPAR_RAE;
1113 }
1114
1115 if (ibqp->srq)
1116 context->params2 |= cpu_to_be32(MLX4_QP_BIT_RIC);
1117
1118 if (attr_mask & IB_QP_MIN_RNR_TIMER) {
1119 context->rnr_nextrecvpsn |= cpu_to_be32(attr->min_rnr_timer << 24);
1120 optpar |= MLX4_QP_OPTPAR_RNR_TIMEOUT;
1121 }
1122 if (attr_mask & IB_QP_RQ_PSN)
1123 context->rnr_nextrecvpsn |= cpu_to_be32(attr->rq_psn);
1124
1125 context->cqn_recv = cpu_to_be32(to_mcq(ibqp->recv_cq)->mcq.cqn);
1126
1127 if (attr_mask & IB_QP_QKEY) {
1128 context->qkey = cpu_to_be32(attr->qkey);
1129 optpar |= MLX4_QP_OPTPAR_Q_KEY;
1130 }
1131
1132 if (ibqp->srq)
1133 context->srqn = cpu_to_be32(1 << 24 | to_msrq(ibqp->srq)->msrq.srqn);
1134
1135 if (!ibqp->srq && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1136 context->db_rec_addr = cpu_to_be64(qp->db.dma);
1137
1138 if (cur_state == IB_QPS_INIT &&
1139 new_state == IB_QPS_RTR &&
1140 (ibqp->qp_type == IB_QPT_GSI || ibqp->qp_type == IB_QPT_SMI ||
1141 ibqp->qp_type == IB_QPT_UD)) {
1142 context->pri_path.sched_queue = (qp->port - 1) << 6;
1143 if (is_qp0(dev, qp))
1144 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_QP0_SCHED_QUEUE;
1145 else
1146 context->pri_path.sched_queue |= MLX4_IB_DEFAULT_SCHED_QUEUE;
1147 }
1148
1149 if (cur_state == IB_QPS_RTS && new_state == IB_QPS_SQD &&
1150 attr_mask & IB_QP_EN_SQD_ASYNC_NOTIFY && attr->en_sqd_async_notify)
1151 sqd_event = 1;
1152 else
1153 sqd_event = 0;
1154
1155 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
1156 context->rlkey |= (1 << 4);
1157
1158 /*
1159 * Before passing a kernel QP to the HW, make sure that the
1160 * ownership bits of the send queue are set and the SQ
1161 * headroom is stamped so that the hardware doesn't start
1162 * processing stale work requests.
1163 */
1164 if (!ibqp->uobject && cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
1165 struct mlx4_wqe_ctrl_seg *ctrl;
1166 int i;
1167
1168 for (i = 0; i < qp->sq.wqe_cnt; ++i) {
1169 ctrl = get_send_wqe(qp, i);
1170 ctrl->owner_opcode = cpu_to_be32(1 << 31);
1171 if (qp->sq_max_wqes_per_wr == 1)
1172 ctrl->fence_size = 1 << (qp->sq.wqe_shift - 4);
1173
1174 stamp_send_wqe(qp, i, 1 << qp->sq.wqe_shift);
1175 }
1176 }
1177
1178 err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state),
1179 to_mlx4_state(new_state), context, optpar,
1180 sqd_event, &qp->mqp);
1181 if (err)
1182 goto out;
1183
1184 qp->state = new_state;
1185
1186 if (attr_mask & IB_QP_ACCESS_FLAGS)
1187 qp->atomic_rd_en = attr->qp_access_flags;
1188 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
1189 qp->resp_depth = attr->max_dest_rd_atomic;
1190 if (attr_mask & IB_QP_PORT) {
1191 qp->port = attr->port_num;
1192 update_mcg_macs(dev, qp);
1193 }
1194 if (attr_mask & IB_QP_ALT_PATH)
1195 qp->alt_port = attr->alt_port_num;
1196
1197 if (is_sqp(dev, qp))
1198 store_sqp_attrs(to_msqp(qp), attr, attr_mask);
1199
1200 /*
1201 * If we moved QP0 to RTR, bring the IB link up; if we moved
1202 * QP0 to RESET or ERROR, bring the link back down.
1203 */
1204 if (is_qp0(dev, qp)) {
1205 if (cur_state != IB_QPS_RTR && new_state == IB_QPS_RTR)
1206 if (mlx4_INIT_PORT(dev->dev, qp->port))
1207 printk(KERN_WARNING "INIT_PORT failed for port %d\n",
1208 qp->port);
1209
1210 if (cur_state != IB_QPS_RESET && cur_state != IB_QPS_ERR &&
1211 (new_state == IB_QPS_RESET || new_state == IB_QPS_ERR))
1212 mlx4_CLOSE_PORT(dev->dev, qp->port);
1213 }
1214
1215 /*
1216 * If we moved a kernel QP to RESET, clean up all old CQ
1217 * entries and reinitialize the QP.
1218 */
1219 if (new_state == IB_QPS_RESET && !ibqp->uobject) {
1220 mlx4_ib_cq_clean(to_mcq(ibqp->recv_cq), qp->mqp.qpn,
1221 ibqp->srq ? to_msrq(ibqp->srq): NULL);
1222 if (ibqp->send_cq != ibqp->recv_cq)
1223 mlx4_ib_cq_clean(to_mcq(ibqp->send_cq), qp->mqp.qpn, NULL);
1224
1225 qp->rq.head = 0;
1226 qp->rq.tail = 0;
1227 qp->sq.head = 0;
1228 qp->sq.tail = 0;
1229 qp->sq_next_wqe = 0;
1230 if (!ibqp->srq)
1231 *qp->db.db = 0;
1232 }
1233
1234 out:
1235 kfree(context);
1236 return err;
1237 }
1238
1239 int mlx4_ib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
1240 int attr_mask, struct ib_udata *udata)
1241 {
1242 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
1243 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1244 enum ib_qp_state cur_state, new_state;
1245 int err = -EINVAL;
1246
1247 mutex_lock(&qp->mutex);
1248
1249 cur_state = attr_mask & IB_QP_CUR_STATE ? attr->cur_qp_state : qp->state;
1250 new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
1251
1252 if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type, attr_mask))
1253 goto out;
1254
1255 if ((attr_mask & IB_QP_PORT) &&
1256 (attr->port_num == 0 || attr->port_num > dev->dev->caps.num_ports)) {
1257 goto out;
1258 }
1259
1260 if (attr_mask & IB_QP_PKEY_INDEX) {
1261 int p = attr_mask & IB_QP_PORT ? attr->port_num : qp->port;
1262 if (attr->pkey_index >= dev->dev->caps.pkey_table_len[p])
1263 goto out;
1264 }
1265
1266 if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC &&
1267 attr->max_rd_atomic > dev->dev->caps.max_qp_init_rdma) {
1268 goto out;
1269 }
1270
1271 if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC &&
1272 attr->max_dest_rd_atomic > dev->dev->caps.max_qp_dest_rdma) {
1273 goto out;
1274 }
1275
1276 if (cur_state == new_state && cur_state == IB_QPS_RESET) {
1277 err = 0;
1278 goto out;
1279 }
1280
1281 err = __mlx4_ib_modify_qp(ibqp, attr, attr_mask, cur_state, new_state);
1282
1283 out:
1284 mutex_unlock(&qp->mutex);
1285 return err;
1286 }
1287
1288 static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
1289 void *wqe, unsigned *mlx_seg_len)
1290 {
1291 struct ib_device *ib_dev = sqp->qp.ibqp.device;
1292 struct mlx4_wqe_mlx_seg *mlx = wqe;
1293 struct mlx4_wqe_inline_seg *inl = wqe + sizeof *mlx;
1294 struct mlx4_ib_ah *ah = to_mah(wr->wr.ud.ah);
1295 union ib_gid sgid;
1296 u16 pkey;
1297 int send_size;
1298 int header_size;
1299 int spc;
1300 int i;
1301 int is_eth;
1302 int is_vlan = 0;
1303 int is_grh;
1304 u16 vlan;
1305
1306 send_size = 0;
1307 for (i = 0; i < wr->num_sge; ++i)
1308 send_size += wr->sg_list[i].length;
1309
1310 is_eth = rdma_port_get_link_layer(sqp->qp.ibqp.device, sqp->qp.port) == IB_LINK_LAYER_ETHERNET;
1311 is_grh = mlx4_ib_ah_grh_present(ah);
1312 if (is_eth) {
1313 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24,
1314 ah->av.ib.gid_index, &sgid);
1315 vlan = rdma_get_vlan_id(&sgid);
1316 is_vlan = vlan < 0x1000;
1317 }
1318 ib_ud_header_init(send_size, !is_eth, is_eth, is_vlan, is_grh, 0, &sqp->ud_header);
1319
1320 if (!is_eth) {
1321 sqp->ud_header.lrh.service_level =
1322 be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
1323 sqp->ud_header.lrh.destination_lid = ah->av.ib.dlid;
1324 sqp->ud_header.lrh.source_lid = cpu_to_be16(ah->av.ib.g_slid & 0x7f);
1325 }
1326
1327 if (is_grh) {
1328 sqp->ud_header.grh.traffic_class =
1329 (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20) & 0xff;
1330 sqp->ud_header.grh.flow_label =
1331 ah->av.ib.sl_tclass_flowlabel & cpu_to_be32(0xfffff);
1332 sqp->ud_header.grh.hop_limit = ah->av.ib.hop_limit;
1333 ib_get_cached_gid(ib_dev, be32_to_cpu(ah->av.ib.port_pd) >> 24,
1334 ah->av.ib.gid_index, &sqp->ud_header.grh.source_gid);
1335 memcpy(sqp->ud_header.grh.destination_gid.raw,
1336 ah->av.ib.dgid, 16);
1337 }
1338
1339 mlx->flags &= cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE);
1340
1341 if (!is_eth) {
1342 mlx->flags |= cpu_to_be32((!sqp->qp.ibqp.qp_num ? MLX4_WQE_MLX_VL15 : 0) |
1343 (sqp->ud_header.lrh.destination_lid ==
1344 IB_LID_PERMISSIVE ? MLX4_WQE_MLX_SLR : 0) |
1345 (sqp->ud_header.lrh.service_level << 8));
1346 mlx->rlid = sqp->ud_header.lrh.destination_lid;
1347 }
1348
1349 switch (wr->opcode) {
1350 case IB_WR_SEND:
1351 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY;
1352 sqp->ud_header.immediate_present = 0;
1353 break;
1354 case IB_WR_SEND_WITH_IMM:
1355 sqp->ud_header.bth.opcode = IB_OPCODE_UD_SEND_ONLY_WITH_IMMEDIATE;
1356 sqp->ud_header.immediate_present = 1;
1357 sqp->ud_header.immediate_data = wr->ex.imm_data;
1358 break;
1359 default:
1360 return -EINVAL;
1361 }
1362
1363 if (is_eth) {
1364 u8 *smac;
1365
1366 memcpy(sqp->ud_header.eth.dmac_h, ah->av.eth.mac, 6);
1367 /* FIXME: cache smac value? */
1368 smac = to_mdev(sqp->qp.ibqp.device)->iboe.netdevs[sqp->qp.port - 1]->dev_addr;
1369 memcpy(sqp->ud_header.eth.smac_h, smac, 6);
1370 if (!memcmp(sqp->ud_header.eth.smac_h, sqp->ud_header.eth.dmac_h, 6))
1371 mlx->flags |= cpu_to_be32(MLX4_WQE_CTRL_FORCE_LOOPBACK);
1372 if (!is_vlan) {
1373 sqp->ud_header.eth.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1374 } else {
1375 u16 pcp;
1376
1377 sqp->ud_header.vlan.type = cpu_to_be16(MLX4_IB_IBOE_ETHERTYPE);
1378 pcp = (be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 27 & 3) << 13;
1379 sqp->ud_header.vlan.tag = cpu_to_be16(vlan | pcp);
1380 }
1381 } else {
1382 sqp->ud_header.lrh.virtual_lane = !sqp->qp.ibqp.qp_num ? 15 : 0;
1383 if (sqp->ud_header.lrh.destination_lid == IB_LID_PERMISSIVE)
1384 sqp->ud_header.lrh.source_lid = IB_LID_PERMISSIVE;
1385 }
1386 sqp->ud_header.bth.solicited_event = !!(wr->send_flags & IB_SEND_SOLICITED);
1387 if (!sqp->qp.ibqp.qp_num)
1388 ib_get_cached_pkey(ib_dev, sqp->qp.port, sqp->pkey_index, &pkey);
1389 else
1390 ib_get_cached_pkey(ib_dev, sqp->qp.port, wr->wr.ud.pkey_index, &pkey);
1391 sqp->ud_header.bth.pkey = cpu_to_be16(pkey);
1392 sqp->ud_header.bth.destination_qpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1393 sqp->ud_header.bth.psn = cpu_to_be32((sqp->send_psn++) & ((1 << 24) - 1));
1394 sqp->ud_header.deth.qkey = cpu_to_be32(wr->wr.ud.remote_qkey & 0x80000000 ?
1395 sqp->qkey : wr->wr.ud.remote_qkey);
1396 sqp->ud_header.deth.source_qpn = cpu_to_be32(sqp->qp.ibqp.qp_num);
1397
1398 header_size = ib_ud_header_pack(&sqp->ud_header, sqp->header_buf);
1399
1400 if (0) {
1401 printk(KERN_ERR "built UD header of size %d:\n", header_size);
1402 for (i = 0; i < header_size / 4; ++i) {
1403 if (i % 8 == 0)
1404 printk(" [%02x] ", i * 4);
1405 printk(" %08x",
1406 be32_to_cpu(((__be32 *) sqp->header_buf)[i]));
1407 if ((i + 1) % 8 == 0)
1408 printk("\n");
1409 }
1410 printk("\n");
1411 }
1412
1413 /*
1414 * Inline data segments may not cross a 64 byte boundary. If
1415 * our UD header is bigger than the space available up to the
1416 * next 64 byte boundary in the WQE, use two inline data
1417 * segments to hold the UD header.
1418 */
1419 spc = MLX4_INLINE_ALIGN -
1420 ((unsigned long) (inl + 1) & (MLX4_INLINE_ALIGN - 1));
1421 if (header_size <= spc) {
1422 inl->byte_count = cpu_to_be32(1 << 31 | header_size);
1423 memcpy(inl + 1, sqp->header_buf, header_size);
1424 i = 1;
1425 } else {
1426 inl->byte_count = cpu_to_be32(1 << 31 | spc);
1427 memcpy(inl + 1, sqp->header_buf, spc);
1428
1429 inl = (void *) (inl + 1) + spc;
1430 memcpy(inl + 1, sqp->header_buf + spc, header_size - spc);
1431 /*
1432 * Need a barrier here to make sure all the data is
1433 * visible before the byte_count field is set.
1434 * Otherwise the HCA prefetcher could grab the 64-byte
1435 * chunk with this inline segment and get a valid (!=
1436 * 0xffffffff) byte count but stale data, and end up
1437 * generating a packet with bad headers.
1438 *
1439 * The first inline segment's byte_count field doesn't
1440 * need a barrier, because it comes after a
1441 * control/MLX segment and therefore is at an offset
1442 * of 16 mod 64.
1443 */
1444 wmb();
1445 inl->byte_count = cpu_to_be32(1 << 31 | (header_size - spc));
1446 i = 2;
1447 }
1448
1449 *mlx_seg_len =
1450 ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
1451 return 0;
1452 }
1453
1454 static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
1455 {
1456 unsigned cur;
1457 struct mlx4_ib_cq *cq;
1458
1459 cur = wq->head - wq->tail;
1460 if (likely(cur + nreq < wq->max_post))
1461 return 0;
1462
1463 cq = to_mcq(ib_cq);
1464 spin_lock(&cq->lock);
1465 cur = wq->head - wq->tail;
1466 spin_unlock(&cq->lock);
1467
1468 return cur + nreq >= wq->max_post;
1469 }
1470
1471 static __be32 convert_access(int acc)
1472 {
1473 return (acc & IB_ACCESS_REMOTE_ATOMIC ? cpu_to_be32(MLX4_WQE_FMR_PERM_ATOMIC) : 0) |
1474 (acc & IB_ACCESS_REMOTE_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_WRITE) : 0) |
1475 (acc & IB_ACCESS_REMOTE_READ ? cpu_to_be32(MLX4_WQE_FMR_PERM_REMOTE_READ) : 0) |
1476 (acc & IB_ACCESS_LOCAL_WRITE ? cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_WRITE) : 0) |
1477 cpu_to_be32(MLX4_WQE_FMR_PERM_LOCAL_READ);
1478 }
1479
1480 static void set_fmr_seg(struct mlx4_wqe_fmr_seg *fseg, struct ib_send_wr *wr)
1481 {
1482 struct mlx4_ib_fast_reg_page_list *mfrpl = to_mfrpl(wr->wr.fast_reg.page_list);
1483 int i;
1484
1485 for (i = 0; i < wr->wr.fast_reg.page_list_len; ++i)
1486 mfrpl->mapped_page_list[i] =
1487 cpu_to_be64(wr->wr.fast_reg.page_list->page_list[i] |
1488 MLX4_MTT_FLAG_PRESENT);
1489
1490 fseg->flags = convert_access(wr->wr.fast_reg.access_flags);
1491 fseg->mem_key = cpu_to_be32(wr->wr.fast_reg.rkey);
1492 fseg->buf_list = cpu_to_be64(mfrpl->map);
1493 fseg->start_addr = cpu_to_be64(wr->wr.fast_reg.iova_start);
1494 fseg->reg_len = cpu_to_be64(wr->wr.fast_reg.length);
1495 fseg->offset = 0; /* XXX -- is this just for ZBVA? */
1496 fseg->page_size = cpu_to_be32(wr->wr.fast_reg.page_shift);
1497 fseg->reserved[0] = 0;
1498 fseg->reserved[1] = 0;
1499 }
1500
1501 static void set_local_inv_seg(struct mlx4_wqe_local_inval_seg *iseg, u32 rkey)
1502 {
1503 iseg->flags = 0;
1504 iseg->mem_key = cpu_to_be32(rkey);
1505 iseg->guest_id = 0;
1506 iseg->pa = 0;
1507 }
1508
1509 static __always_inline void set_raddr_seg(struct mlx4_wqe_raddr_seg *rseg,
1510 u64 remote_addr, u32 rkey)
1511 {
1512 rseg->raddr = cpu_to_be64(remote_addr);
1513 rseg->rkey = cpu_to_be32(rkey);
1514 rseg->reserved = 0;
1515 }
1516
1517 static void set_atomic_seg(struct mlx4_wqe_atomic_seg *aseg, struct ib_send_wr *wr)
1518 {
1519 if (wr->opcode == IB_WR_ATOMIC_CMP_AND_SWP) {
1520 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1521 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add);
1522 } else if (wr->opcode == IB_WR_MASKED_ATOMIC_FETCH_AND_ADD) {
1523 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1524 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1525 } else {
1526 aseg->swap_add = cpu_to_be64(wr->wr.atomic.compare_add);
1527 aseg->compare = 0;
1528 }
1529
1530 }
1531
1532 static void set_masked_atomic_seg(struct mlx4_wqe_masked_atomic_seg *aseg,
1533 struct ib_send_wr *wr)
1534 {
1535 aseg->swap_add = cpu_to_be64(wr->wr.atomic.swap);
1536 aseg->swap_add_mask = cpu_to_be64(wr->wr.atomic.swap_mask);
1537 aseg->compare = cpu_to_be64(wr->wr.atomic.compare_add);
1538 aseg->compare_mask = cpu_to_be64(wr->wr.atomic.compare_add_mask);
1539 }
1540
1541 static void set_datagram_seg(struct mlx4_wqe_datagram_seg *dseg,
1542 struct ib_send_wr *wr, __be16 *vlan)
1543 {
1544 memcpy(dseg->av, &to_mah(wr->wr.ud.ah)->av, sizeof (struct mlx4_av));
1545 dseg->dqpn = cpu_to_be32(wr->wr.ud.remote_qpn);
1546 dseg->qkey = cpu_to_be32(wr->wr.ud.remote_qkey);
1547 dseg->vlan = to_mah(wr->wr.ud.ah)->av.eth.vlan;
1548 memcpy(dseg->mac, to_mah(wr->wr.ud.ah)->av.eth.mac, 6);
1549 *vlan = dseg->vlan;
1550 }
1551
1552 static void set_mlx_icrc_seg(void *dseg)
1553 {
1554 u32 *t = dseg;
1555 struct mlx4_wqe_inline_seg *iseg = dseg;
1556
1557 t[1] = 0;
1558
1559 /*
1560 * Need a barrier here before writing the byte_count field to
1561 * make sure that all the data is visible before the
1562 * byte_count field is set. Otherwise, if the segment begins
1563 * a new cacheline, the HCA prefetcher could grab the 64-byte
1564 * chunk and get a valid (!= * 0xffffffff) byte count but
1565 * stale data, and end up sending the wrong data.
1566 */
1567 wmb();
1568
1569 iseg->byte_count = cpu_to_be32((1 << 31) | 4);
1570 }
1571
1572 static void set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1573 {
1574 dseg->lkey = cpu_to_be32(sg->lkey);
1575 dseg->addr = cpu_to_be64(sg->addr);
1576
1577 /*
1578 * Need a barrier here before writing the byte_count field to
1579 * make sure that all the data is visible before the
1580 * byte_count field is set. Otherwise, if the segment begins
1581 * a new cacheline, the HCA prefetcher could grab the 64-byte
1582 * chunk and get a valid (!= * 0xffffffff) byte count but
1583 * stale data, and end up sending the wrong data.
1584 */
1585 wmb();
1586
1587 dseg->byte_count = cpu_to_be32(sg->length);
1588 }
1589
1590 static void __set_data_seg(struct mlx4_wqe_data_seg *dseg, struct ib_sge *sg)
1591 {
1592 dseg->byte_count = cpu_to_be32(sg->length);
1593 dseg->lkey = cpu_to_be32(sg->lkey);
1594 dseg->addr = cpu_to_be64(sg->addr);
1595 }
1596
1597 static int build_lso_seg(struct mlx4_wqe_lso_seg *wqe, struct ib_send_wr *wr,
1598 struct mlx4_ib_qp *qp, unsigned *lso_seg_len,
1599 __be32 *lso_hdr_sz, __be32 *blh)
1600 {
1601 unsigned halign = ALIGN(sizeof *wqe + wr->wr.ud.hlen, 16);
1602
1603 if (unlikely(halign > MLX4_IB_CACHE_LINE_SIZE))
1604 *blh = cpu_to_be32(1 << 6);
1605
1606 if (unlikely(!(qp->flags & MLX4_IB_QP_LSO) &&
1607 wr->num_sge > qp->sq.max_gs - (halign >> 4)))
1608 return -EINVAL;
1609
1610 memcpy(wqe->header, wr->wr.ud.header, wr->wr.ud.hlen);
1611
1612 *lso_hdr_sz = cpu_to_be32((wr->wr.ud.mss - wr->wr.ud.hlen) << 16 |
1613 wr->wr.ud.hlen);
1614 *lso_seg_len = halign;
1615 return 0;
1616 }
1617
1618 static __be32 send_ieth(struct ib_send_wr *wr)
1619 {
1620 switch (wr->opcode) {
1621 case IB_WR_SEND_WITH_IMM:
1622 case IB_WR_RDMA_WRITE_WITH_IMM:
1623 return wr->ex.imm_data;
1624
1625 case IB_WR_SEND_WITH_INV:
1626 return cpu_to_be32(wr->ex.invalidate_rkey);
1627
1628 default:
1629 return 0;
1630 }
1631 }
1632
1633 int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
1634 struct ib_send_wr **bad_wr)
1635 {
1636 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1637 void *wqe;
1638 struct mlx4_wqe_ctrl_seg *ctrl;
1639 struct mlx4_wqe_data_seg *dseg;
1640 unsigned long flags;
1641 int nreq;
1642 int err = 0;
1643 unsigned ind;
1644 int uninitialized_var(stamp);
1645 int uninitialized_var(size);
1646 unsigned uninitialized_var(seglen);
1647 __be32 dummy;
1648 __be32 *lso_wqe;
1649 __be32 uninitialized_var(lso_hdr_sz);
1650 __be32 blh;
1651 int i;
1652 __be16 vlan = cpu_to_be16(0xffff);
1653
1654 spin_lock_irqsave(&qp->sq.lock, flags);
1655
1656 ind = qp->sq_next_wqe;
1657
1658 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1659 lso_wqe = &dummy;
1660 blh = 0;
1661
1662 if (mlx4_wq_overflow(&qp->sq, nreq, qp->ibqp.send_cq)) {
1663 err = -ENOMEM;
1664 *bad_wr = wr;
1665 goto out;
1666 }
1667
1668 if (unlikely(wr->num_sge > qp->sq.max_gs)) {
1669 err = -EINVAL;
1670 *bad_wr = wr;
1671 goto out;
1672 }
1673
1674 ctrl = wqe = get_send_wqe(qp, ind & (qp->sq.wqe_cnt - 1));
1675 qp->sq.wrid[(qp->sq.head + nreq) & (qp->sq.wqe_cnt - 1)] = wr->wr_id;
1676
1677 ctrl->srcrb_flags =
1678 (wr->send_flags & IB_SEND_SIGNALED ?
1679 cpu_to_be32(MLX4_WQE_CTRL_CQ_UPDATE) : 0) |
1680 (wr->send_flags & IB_SEND_SOLICITED ?
1681 cpu_to_be32(MLX4_WQE_CTRL_SOLICITED) : 0) |
1682 ((wr->send_flags & IB_SEND_IP_CSUM) ?
1683 cpu_to_be32(MLX4_WQE_CTRL_IP_CSUM |
1684 MLX4_WQE_CTRL_TCP_UDP_CSUM) : 0) |
1685 qp->sq_signal_bits;
1686
1687 ctrl->imm = send_ieth(wr);
1688
1689 wqe += sizeof *ctrl;
1690 size = sizeof *ctrl / 16;
1691
1692 switch (ibqp->qp_type) {
1693 case IB_QPT_RC:
1694 case IB_QPT_UC:
1695 switch (wr->opcode) {
1696 case IB_WR_ATOMIC_CMP_AND_SWP:
1697 case IB_WR_ATOMIC_FETCH_AND_ADD:
1698 case IB_WR_MASKED_ATOMIC_FETCH_AND_ADD:
1699 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1700 wr->wr.atomic.rkey);
1701 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1702
1703 set_atomic_seg(wqe, wr);
1704 wqe += sizeof (struct mlx4_wqe_atomic_seg);
1705
1706 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1707 sizeof (struct mlx4_wqe_atomic_seg)) / 16;
1708
1709 break;
1710
1711 case IB_WR_MASKED_ATOMIC_CMP_AND_SWP:
1712 set_raddr_seg(wqe, wr->wr.atomic.remote_addr,
1713 wr->wr.atomic.rkey);
1714 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1715
1716 set_masked_atomic_seg(wqe, wr);
1717 wqe += sizeof (struct mlx4_wqe_masked_atomic_seg);
1718
1719 size += (sizeof (struct mlx4_wqe_raddr_seg) +
1720 sizeof (struct mlx4_wqe_masked_atomic_seg)) / 16;
1721
1722 break;
1723
1724 case IB_WR_RDMA_READ:
1725 case IB_WR_RDMA_WRITE:
1726 case IB_WR_RDMA_WRITE_WITH_IMM:
1727 set_raddr_seg(wqe, wr->wr.rdma.remote_addr,
1728 wr->wr.rdma.rkey);
1729 wqe += sizeof (struct mlx4_wqe_raddr_seg);
1730 size += sizeof (struct mlx4_wqe_raddr_seg) / 16;
1731 break;
1732
1733 case IB_WR_LOCAL_INV:
1734 ctrl->srcrb_flags |=
1735 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1736 set_local_inv_seg(wqe, wr->ex.invalidate_rkey);
1737 wqe += sizeof (struct mlx4_wqe_local_inval_seg);
1738 size += sizeof (struct mlx4_wqe_local_inval_seg) / 16;
1739 break;
1740
1741 case IB_WR_FAST_REG_MR:
1742 ctrl->srcrb_flags |=
1743 cpu_to_be32(MLX4_WQE_CTRL_STRONG_ORDER);
1744 set_fmr_seg(wqe, wr);
1745 wqe += sizeof (struct mlx4_wqe_fmr_seg);
1746 size += sizeof (struct mlx4_wqe_fmr_seg) / 16;
1747 break;
1748
1749 default:
1750 /* No extra segments required for sends */
1751 break;
1752 }
1753 break;
1754
1755 case IB_QPT_UD:
1756 set_datagram_seg(wqe, wr, &vlan);
1757 wqe += sizeof (struct mlx4_wqe_datagram_seg);
1758 size += sizeof (struct mlx4_wqe_datagram_seg) / 16;
1759
1760 if (wr->opcode == IB_WR_LSO) {
1761 err = build_lso_seg(wqe, wr, qp, &seglen, &lso_hdr_sz, &blh);
1762 if (unlikely(err)) {
1763 *bad_wr = wr;
1764 goto out;
1765 }
1766 lso_wqe = (__be32 *) wqe;
1767 wqe += seglen;
1768 size += seglen / 16;
1769 }
1770 break;
1771
1772 case IB_QPT_SMI:
1773 case IB_QPT_GSI:
1774 err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen);
1775 if (unlikely(err)) {
1776 *bad_wr = wr;
1777 goto out;
1778 }
1779 wqe += seglen;
1780 size += seglen / 16;
1781 break;
1782
1783 default:
1784 break;
1785 }
1786
1787 /*
1788 * Write data segments in reverse order, so as to
1789 * overwrite cacheline stamp last within each
1790 * cacheline. This avoids issues with WQE
1791 * prefetching.
1792 */
1793
1794 dseg = wqe;
1795 dseg += wr->num_sge - 1;
1796 size += wr->num_sge * (sizeof (struct mlx4_wqe_data_seg) / 16);
1797
1798 /* Add one more inline data segment for ICRC for MLX sends */
1799 if (unlikely(qp->ibqp.qp_type == IB_QPT_SMI ||
1800 qp->ibqp.qp_type == IB_QPT_GSI)) {
1801 set_mlx_icrc_seg(dseg + 1);
1802 size += sizeof (struct mlx4_wqe_data_seg) / 16;
1803 }
1804
1805 for (i = wr->num_sge - 1; i >= 0; --i, --dseg)
1806 set_data_seg(dseg, wr->sg_list + i);
1807
1808 /*
1809 * Possibly overwrite stamping in cacheline with LSO
1810 * segment only after making sure all data segments
1811 * are written.
1812 */
1813 wmb();
1814 *lso_wqe = lso_hdr_sz;
1815
1816 ctrl->fence_size = (wr->send_flags & IB_SEND_FENCE ?
1817 MLX4_WQE_CTRL_FENCE : 0) | size;
1818
1819 /*
1820 * Make sure descriptor is fully written before
1821 * setting ownership bit (because HW can start
1822 * executing as soon as we do).
1823 */
1824 wmb();
1825
1826 if (wr->opcode < 0 || wr->opcode >= ARRAY_SIZE(mlx4_ib_opcode)) {
1827 err = -EINVAL;
1828 goto out;
1829 }
1830
1831 ctrl->owner_opcode = mlx4_ib_opcode[wr->opcode] |
1832 (ind & qp->sq.wqe_cnt ? cpu_to_be32(1 << 31) : 0) | blh;
1833
1834 if (be16_to_cpu(vlan) < 0x1000) {
1835 ctrl->ins_vlan = 1 << 6;
1836 ctrl->vlan_tag = vlan;
1837 }
1838
1839 stamp = ind + qp->sq_spare_wqes;
1840 ind += DIV_ROUND_UP(size * 16, 1U << qp->sq.wqe_shift);
1841
1842 /*
1843 * We can improve latency by not stamping the last
1844 * send queue WQE until after ringing the doorbell, so
1845 * only stamp here if there are still more WQEs to post.
1846 *
1847 * Same optimization applies to padding with NOP wqe
1848 * in case of WQE shrinking (used to prevent wrap-around
1849 * in the middle of WR).
1850 */
1851 if (wr->next) {
1852 stamp_send_wqe(qp, stamp, size * 16);
1853 ind = pad_wraparound(qp, ind);
1854 }
1855 }
1856
1857 out:
1858 if (likely(nreq)) {
1859 qp->sq.head += nreq;
1860
1861 /*
1862 * Make sure that descriptors are written before
1863 * doorbell record.
1864 */
1865 wmb();
1866
1867 writel(qp->doorbell_qpn,
1868 to_mdev(ibqp->device)->uar_map + MLX4_SEND_DOORBELL);
1869
1870 /*
1871 * Make sure doorbells don't leak out of SQ spinlock
1872 * and reach the HCA out of order.
1873 */
1874 mmiowb();
1875
1876 stamp_send_wqe(qp, stamp, size * 16);
1877
1878 ind = pad_wraparound(qp, ind);
1879 qp->sq_next_wqe = ind;
1880 }
1881
1882 spin_unlock_irqrestore(&qp->sq.lock, flags);
1883
1884 return err;
1885 }
1886
1887 int mlx4_ib_post_recv(struct ib_qp *ibqp, struct ib_recv_wr *wr,
1888 struct ib_recv_wr **bad_wr)
1889 {
1890 struct mlx4_ib_qp *qp = to_mqp(ibqp);
1891 struct mlx4_wqe_data_seg *scat;
1892 unsigned long flags;
1893 int err = 0;
1894 int nreq;
1895 int ind;
1896 int i;
1897
1898 spin_lock_irqsave(&qp->rq.lock, flags);
1899
1900 ind = qp->rq.head & (qp->rq.wqe_cnt - 1);
1901
1902 for (nreq = 0; wr; ++nreq, wr = wr->next) {
1903 if (mlx4_wq_overflow(&qp->rq, nreq, qp->ibqp.recv_cq)) {
1904 err = -ENOMEM;
1905 *bad_wr = wr;
1906 goto out;
1907 }
1908
1909 if (unlikely(wr->num_sge > qp->rq.max_gs)) {
1910 err = -EINVAL;
1911 *bad_wr = wr;
1912 goto out;
1913 }
1914
1915 scat = get_recv_wqe(qp, ind);
1916
1917 for (i = 0; i < wr->num_sge; ++i)
1918 __set_data_seg(scat + i, wr->sg_list + i);
1919
1920 if (i < qp->rq.max_gs) {
1921 scat[i].byte_count = 0;
1922 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
1923 scat[i].addr = 0;
1924 }
1925
1926 qp->rq.wrid[ind] = wr->wr_id;
1927
1928 ind = (ind + 1) & (qp->rq.wqe_cnt - 1);
1929 }
1930
1931 out:
1932 if (likely(nreq)) {
1933 qp->rq.head += nreq;
1934
1935 /*
1936 * Make sure that descriptors are written before
1937 * doorbell record.
1938 */
1939 wmb();
1940
1941 *qp->db.db = cpu_to_be32(qp->rq.head & 0xffff);
1942 }
1943
1944 spin_unlock_irqrestore(&qp->rq.lock, flags);
1945
1946 return err;
1947 }
1948
1949 static inline enum ib_qp_state to_ib_qp_state(enum mlx4_qp_state mlx4_state)
1950 {
1951 switch (mlx4_state) {
1952 case MLX4_QP_STATE_RST: return IB_QPS_RESET;
1953 case MLX4_QP_STATE_INIT: return IB_QPS_INIT;
1954 case MLX4_QP_STATE_RTR: return IB_QPS_RTR;
1955 case MLX4_QP_STATE_RTS: return IB_QPS_RTS;
1956 case MLX4_QP_STATE_SQ_DRAINING:
1957 case MLX4_QP_STATE_SQD: return IB_QPS_SQD;
1958 case MLX4_QP_STATE_SQER: return IB_QPS_SQE;
1959 case MLX4_QP_STATE_ERR: return IB_QPS_ERR;
1960 default: return -1;
1961 }
1962 }
1963
1964 static inline enum ib_mig_state to_ib_mig_state(int mlx4_mig_state)
1965 {
1966 switch (mlx4_mig_state) {
1967 case MLX4_QP_PM_ARMED: return IB_MIG_ARMED;
1968 case MLX4_QP_PM_REARM: return IB_MIG_REARM;
1969 case MLX4_QP_PM_MIGRATED: return IB_MIG_MIGRATED;
1970 default: return -1;
1971 }
1972 }
1973
1974 static int to_ib_qp_access_flags(int mlx4_flags)
1975 {
1976 int ib_flags = 0;
1977
1978 if (mlx4_flags & MLX4_QP_BIT_RRE)
1979 ib_flags |= IB_ACCESS_REMOTE_READ;
1980 if (mlx4_flags & MLX4_QP_BIT_RWE)
1981 ib_flags |= IB_ACCESS_REMOTE_WRITE;
1982 if (mlx4_flags & MLX4_QP_BIT_RAE)
1983 ib_flags |= IB_ACCESS_REMOTE_ATOMIC;
1984
1985 return ib_flags;
1986 }
1987
1988 static void to_ib_ah_attr(struct mlx4_ib_dev *ibdev, struct ib_ah_attr *ib_ah_attr,
1989 struct mlx4_qp_path *path)
1990 {
1991 struct mlx4_dev *dev = ibdev->dev;
1992 int is_eth;
1993
1994 memset(ib_ah_attr, 0, sizeof *ib_ah_attr);
1995 ib_ah_attr->port_num = path->sched_queue & 0x40 ? 2 : 1;
1996
1997 if (ib_ah_attr->port_num == 0 || ib_ah_attr->port_num > dev->caps.num_ports)
1998 return;
1999
2000 is_eth = rdma_port_get_link_layer(&ibdev->ib_dev, ib_ah_attr->port_num) ==
2001 IB_LINK_LAYER_ETHERNET;
2002 if (is_eth)
2003 ib_ah_attr->sl = ((path->sched_queue >> 3) & 0x7) |
2004 ((path->sched_queue & 4) << 1);
2005 else
2006 ib_ah_attr->sl = (path->sched_queue >> 2) & 0xf;
2007
2008 ib_ah_attr->dlid = be16_to_cpu(path->rlid);
2009 ib_ah_attr->src_path_bits = path->grh_mylmc & 0x7f;
2010 ib_ah_attr->static_rate = path->static_rate ? path->static_rate - 5 : 0;
2011 ib_ah_attr->ah_flags = (path->grh_mylmc & (1 << 7)) ? IB_AH_GRH : 0;
2012 if (ib_ah_attr->ah_flags) {
2013 ib_ah_attr->grh.sgid_index = path->mgid_index;
2014 ib_ah_attr->grh.hop_limit = path->hop_limit;
2015 ib_ah_attr->grh.traffic_class =
2016 (be32_to_cpu(path->tclass_flowlabel) >> 20) & 0xff;
2017 ib_ah_attr->grh.flow_label =
2018 be32_to_cpu(path->tclass_flowlabel) & 0xfffff;
2019 memcpy(ib_ah_attr->grh.dgid.raw,
2020 path->rgid, sizeof ib_ah_attr->grh.dgid.raw);
2021 }
2022 }
2023
2024 int mlx4_ib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *qp_attr, int qp_attr_mask,
2025 struct ib_qp_init_attr *qp_init_attr)
2026 {
2027 struct mlx4_ib_dev *dev = to_mdev(ibqp->device);
2028 struct mlx4_ib_qp *qp = to_mqp(ibqp);
2029 struct mlx4_qp_context context;
2030 int mlx4_state;
2031 int err = 0;
2032
2033 mutex_lock(&qp->mutex);
2034
2035 if (qp->state == IB_QPS_RESET) {
2036 qp_attr->qp_state = IB_QPS_RESET;
2037 goto done;
2038 }
2039
2040 err = mlx4_qp_query(dev->dev, &qp->mqp, &context);
2041 if (err) {
2042 err = -EINVAL;
2043 goto out;
2044 }
2045
2046 mlx4_state = be32_to_cpu(context.flags) >> 28;
2047
2048 qp->state = to_ib_qp_state(mlx4_state);
2049 qp_attr->qp_state = qp->state;
2050 qp_attr->path_mtu = context.mtu_msgmax >> 5;
2051 qp_attr->path_mig_state =
2052 to_ib_mig_state((be32_to_cpu(context.flags) >> 11) & 0x3);
2053 qp_attr->qkey = be32_to_cpu(context.qkey);
2054 qp_attr->rq_psn = be32_to_cpu(context.rnr_nextrecvpsn) & 0xffffff;
2055 qp_attr->sq_psn = be32_to_cpu(context.next_send_psn) & 0xffffff;
2056 qp_attr->dest_qp_num = be32_to_cpu(context.remote_qpn) & 0xffffff;
2057 qp_attr->qp_access_flags =
2058 to_ib_qp_access_flags(be32_to_cpu(context.params2));
2059
2060 if (qp->ibqp.qp_type == IB_QPT_RC || qp->ibqp.qp_type == IB_QPT_UC) {
2061 to_ib_ah_attr(dev, &qp_attr->ah_attr, &context.pri_path);
2062 to_ib_ah_attr(dev, &qp_attr->alt_ah_attr, &context.alt_path);
2063 qp_attr->alt_pkey_index = context.alt_path.pkey_index & 0x7f;
2064 qp_attr->alt_port_num = qp_attr->alt_ah_attr.port_num;
2065 }
2066
2067 qp_attr->pkey_index = context.pri_path.pkey_index & 0x7f;
2068 if (qp_attr->qp_state == IB_QPS_INIT)
2069 qp_attr->port_num = qp->port;
2070 else
2071 qp_attr->port_num = context.pri_path.sched_queue & 0x40 ? 2 : 1;
2072
2073 /* qp_attr->en_sqd_async_notify is only applicable in modify qp */
2074 qp_attr->sq_draining = mlx4_state == MLX4_QP_STATE_SQ_DRAINING;
2075
2076 qp_attr->max_rd_atomic = 1 << ((be32_to_cpu(context.params1) >> 21) & 0x7);
2077
2078 qp_attr->max_dest_rd_atomic =
2079 1 << ((be32_to_cpu(context.params2) >> 21) & 0x7);
2080 qp_attr->min_rnr_timer =
2081 (be32_to_cpu(context.rnr_nextrecvpsn) >> 24) & 0x1f;
2082 qp_attr->timeout = context.pri_path.ackto >> 3;
2083 qp_attr->retry_cnt = (be32_to_cpu(context.params1) >> 16) & 0x7;
2084 qp_attr->rnr_retry = (be32_to_cpu(context.params1) >> 13) & 0x7;
2085 qp_attr->alt_timeout = context.alt_path.ackto >> 3;
2086
2087 done:
2088 qp_attr->cur_qp_state = qp_attr->qp_state;
2089 qp_attr->cap.max_recv_wr = qp->rq.wqe_cnt;
2090 qp_attr->cap.max_recv_sge = qp->rq.max_gs;
2091
2092 if (!ibqp->uobject) {
2093 qp_attr->cap.max_send_wr = qp->sq.wqe_cnt;
2094 qp_attr->cap.max_send_sge = qp->sq.max_gs;
2095 } else {
2096 qp_attr->cap.max_send_wr = 0;
2097 qp_attr->cap.max_send_sge = 0;
2098 }
2099
2100 /*
2101 * We don't support inline sends for kernel QPs (yet), and we
2102 * don't know what userspace's value should be.
2103 */
2104 qp_attr->cap.max_inline_data = 0;
2105
2106 qp_init_attr->cap = qp_attr->cap;
2107
2108 qp_init_attr->create_flags = 0;
2109 if (qp->flags & MLX4_IB_QP_BLOCK_MULTICAST_LOOPBACK)
2110 qp_init_attr->create_flags |= IB_QP_CREATE_BLOCK_MULTICAST_LOOPBACK;
2111
2112 if (qp->flags & MLX4_IB_QP_LSO)
2113 qp_init_attr->create_flags |= IB_QP_CREATE_IPOIB_UD_LSO;
2114
2115 out:
2116 mutex_unlock(&qp->mutex);
2117 return err;
2118 }
2119