2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
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:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
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.
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
34 #include <linux/mlx4/qp.h>
35 #include <linux/mlx4/srq.h>
40 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
42 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
45 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
47 struct ib_event event;
48 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
50 if (ibsrq->event_handler) {
51 event.device = ibsrq->device;
52 event.element.srq = ibsrq;
54 case MLX4_EVENT_TYPE_SRQ_LIMIT:
55 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
57 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
58 event.event = IB_EVENT_SRQ_ERR;
61 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
62 "on SRQ %06x\n", type, srq->srqn);
66 ibsrq->event_handler(&event, ibsrq->srq_context);
70 struct ib_srq *mlx4_ib_create_xrc_srq(struct ib_pd *pd,
73 struct ib_srq_init_attr *init_attr,
74 struct ib_udata *udata)
76 struct mlx4_ib_dev *dev = to_mdev(pd->device);
77 struct mlx4_ib_srq *srq;
78 struct mlx4_wqe_srq_next_seg *next;
86 /* Sanity check SRQ size before proceeding */
87 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes ||
88 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge) {
89 mlx4_ib_dbg("a size param is out of range. "
90 "max_wr = 0x%x, max_sge = 0x%x",
91 init_attr->attr.max_wr, init_attr->attr.max_sge);
92 return ERR_PTR(-EINVAL);
95 srq = kzalloc(sizeof *srq, GFP_KERNEL);
97 return ERR_PTR(-ENOMEM);
99 mutex_init(&srq->mutex);
100 spin_lock_init(&srq->lock);
101 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
102 srq->msrq.max_gs = init_attr->attr.max_sge;
104 desc_size = max(32UL,
105 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
107 sizeof (struct mlx4_wqe_data_seg)));
108 srq->msrq.wqe_shift = ilog2(desc_size);
110 buf_size = srq->msrq.max * desc_size;
113 struct mlx4_ib_create_srq ucmd;
115 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
120 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
122 if (IS_ERR(srq->umem)) {
123 err = PTR_ERR(srq->umem);
127 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
128 ilog2(srq->umem->page_size), &srq->mtt);
132 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
136 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
137 ucmd.db_addr, &srq->db);
141 struct mlx4_wqe_data_seg *scatter;
143 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
149 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
155 srq->tail = srq->msrq.max - 1;
158 for (i = 0; i < srq->msrq.max; ++i) {
159 next = get_wqe(srq, i);
160 next->next_wqe_index =
161 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
163 for (scatter = (void *) (next + 1);
164 (void *) scatter < (void *) next + desc_size;
166 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
169 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
174 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
178 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
185 cqn = xrc_cq ? (u32) (to_mcq(xrc_cq)->mcq.cqn) : 0;
186 xrcdn = xrcd ? (u16) (to_mxrcd(xrcd)->xrcdn) :
187 (u16) dev->dev->caps.reserved_xrcds;
189 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
190 srq->db.dma, &srq->msrq);
194 srq->msrq.event = mlx4_ib_srq_event;
197 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
202 srq->ibsrq.xrc_srq_num = srq->msrq.srqn;
204 init_attr->attr.max_wr = srq->msrq.max - 1;
210 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
215 mlx4_mtt_cleanup(dev->dev, &srq->mtt);
219 ib_umem_release(srq->umem);
221 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
225 mlx4_db_free(dev->dev, &srq->db);
233 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
234 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
236 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
237 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
240 /* We don't support resizing SRQs (yet?) */
241 if (attr_mask & IB_SRQ_MAX_WR) {
242 mlx4_ib_dbg("resize not yet supported");
246 if (attr_mask & IB_SRQ_LIMIT) {
247 if (attr->srq_limit >= srq->msrq.max){
248 mlx4_ib_dbg("limit (0x%x) too high", attr->srq_limit);
252 mutex_lock(&srq->mutex);
253 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
254 mutex_unlock(&srq->mutex);
263 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
264 struct ib_srq_init_attr *init_attr,
265 struct ib_udata *udata)
267 return mlx4_ib_create_xrc_srq(pd, NULL, NULL, init_attr, udata);
270 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
272 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
273 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
277 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
281 srq_attr->srq_limit = limit_watermark;
282 srq_attr->max_wr = srq->msrq.max - 1;
283 srq_attr->max_sge = srq->msrq.max_gs;
288 int mlx4_ib_destroy_srq(struct ib_srq *srq)
290 struct mlx4_ib_dev *dev = to_mdev(srq->device);
291 struct mlx4_ib_srq *msrq = to_msrq(srq);
292 struct mlx4_ib_cq *cq;
294 mlx4_srq_invalidate(dev->dev, &msrq->msrq);
296 if (srq->xrc_cq && !srq->uobject) {
297 cq = to_mcq(srq->xrc_cq);
298 spin_lock_irq(&cq->lock);
299 __mlx4_ib_cq_clean(cq, -1, msrq);
300 mlx4_srq_remove(dev->dev, &msrq->msrq);
301 spin_unlock_irq(&cq->lock);
303 mlx4_srq_remove(dev->dev, &msrq->msrq);
305 mlx4_srq_free(dev->dev, &msrq->msrq);
306 mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
309 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
310 ib_umem_release(msrq->umem);
313 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
315 mlx4_db_free(dev->dev, &msrq->db);
323 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
325 struct mlx4_wqe_srq_next_seg *next;
327 /* always called with interrupts disabled. */
328 spin_lock(&srq->lock);
330 next = get_wqe(srq, srq->tail);
331 next->next_wqe_index = cpu_to_be16(wqe_index);
332 srq->tail = wqe_index;
334 spin_unlock(&srq->lock);
337 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
338 struct ib_recv_wr **bad_wr)
340 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
341 struct mlx4_wqe_srq_next_seg *next;
342 struct mlx4_wqe_data_seg *scat;
348 spin_lock_irqsave(&srq->lock, flags);
350 for (nreq = 0; wr; ++nreq, wr = wr->next) {
351 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
352 mlx4_ib_dbg("srq num 0x%x: num s/g entries too large (%d)",
353 srq->msrq.srqn, wr->num_sge);
359 if (unlikely(srq->head == srq->tail)) {
360 mlx4_ib_dbg("srq num 0x%x: No entries available to post.",
367 srq->wrid[srq->head] = wr->wr_id;
369 next = get_wqe(srq, srq->head);
370 srq->head = be16_to_cpu(next->next_wqe_index);
371 scat = (struct mlx4_wqe_data_seg *) (next + 1);
373 for (i = 0; i < wr->num_sge; ++i) {
374 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
375 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
376 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
379 if (i < srq->msrq.max_gs) {
380 scat[i].byte_count = 0;
381 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
387 srq->wqe_ctr += nreq;
390 * Make sure that descriptors are written before
395 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
398 spin_unlock_irqrestore(&srq->lock, flags);