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