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>
36 #include <linux/slab.h>
41 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
43 return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
46 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
48 struct ib_event event;
49 struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
51 if (ibsrq->event_handler) {
52 event.device = ibsrq->device;
53 event.element.srq = ibsrq;
55 case MLX4_EVENT_TYPE_SRQ_LIMIT:
56 event.event = IB_EVENT_SRQ_LIMIT_REACHED;
58 case MLX4_EVENT_TYPE_SRQ_CATAS_ERROR:
59 event.event = IB_EVENT_SRQ_ERR;
62 printk(KERN_WARNING "mlx4_ib: Unexpected event type %d "
63 "on SRQ %06x\n", type, srq->srqn);
67 ibsrq->event_handler(&event, ibsrq->srq_context);
71 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
72 struct ib_srq_init_attr *init_attr,
73 struct ib_udata *udata)
75 struct mlx4_ib_dev *dev = to_mdev(pd->device);
76 struct mlx4_ib_srq *srq;
77 struct mlx4_wqe_srq_next_seg *next;
78 struct mlx4_wqe_data_seg *scatter;
84 /* Sanity check SRQ size before proceeding */
85 if (init_attr->attr.max_wr >= dev->dev->caps.max_srq_wqes ||
86 init_attr->attr.max_sge > dev->dev->caps.max_srq_sge)
87 return ERR_PTR(-EINVAL);
89 srq = kmalloc(sizeof *srq, GFP_KERNEL);
91 return ERR_PTR(-ENOMEM);
93 mutex_init(&srq->mutex);
94 spin_lock_init(&srq->lock);
95 srq->msrq.max = roundup_pow_of_two(init_attr->attr.max_wr + 1);
96 srq->msrq.max_gs = init_attr->attr.max_sge;
99 roundup_pow_of_two(sizeof (struct mlx4_wqe_srq_next_seg) +
101 sizeof (struct mlx4_wqe_data_seg)));
102 srq->msrq.wqe_shift = ilog2(desc_size);
104 buf_size = srq->msrq.max * desc_size;
107 struct mlx4_ib_create_srq ucmd;
109 if (ib_copy_from_udata(&ucmd, udata, sizeof ucmd)) {
114 srq->umem = ib_umem_get(pd->uobject->context, ucmd.buf_addr,
116 if (IS_ERR(srq->umem)) {
117 err = PTR_ERR(srq->umem);
121 err = mlx4_mtt_init(dev->dev, ib_umem_page_count(srq->umem),
122 ilog2(srq->umem->page_size), &srq->mtt);
126 err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
130 err = mlx4_ib_db_map_user(to_mucontext(pd->uobject->context),
131 ucmd.db_addr, &srq->db);
135 err = mlx4_db_alloc(dev->dev, &srq->db, 0);
141 if (mlx4_buf_alloc(dev->dev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
147 srq->tail = srq->msrq.max - 1;
150 for (i = 0; i < srq->msrq.max; ++i) {
151 next = get_wqe(srq, i);
152 next->next_wqe_index =
153 cpu_to_be16((i + 1) & (srq->msrq.max - 1));
155 for (scatter = (void *) (next + 1);
156 (void *) scatter < (void *) next + desc_size;
158 scatter->lkey = cpu_to_be32(MLX4_INVALID_LKEY);
161 err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
166 err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
170 srq->wrid = kmalloc(srq->msrq.max * sizeof (u64), GFP_KERNEL);
177 err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
178 srq->db.dma, &srq->msrq);
182 srq->msrq.event = mlx4_ib_srq_event;
185 if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
190 init_attr->attr.max_wr = srq->msrq.max - 1;
196 mlx4_ib_db_unmap_user(to_mucontext(pd->uobject->context), &srq->db);
201 mlx4_mtt_cleanup(dev->dev, &srq->mtt);
205 ib_umem_release(srq->umem);
207 mlx4_buf_free(dev->dev, buf_size, &srq->buf);
211 mlx4_db_free(dev->dev, &srq->db);
219 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
220 enum ib_srq_attr_mask attr_mask, struct ib_udata *udata)
222 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
223 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
226 /* We don't support resizing SRQs (yet?) */
227 if (attr_mask & IB_SRQ_MAX_WR)
230 if (attr_mask & IB_SRQ_LIMIT) {
231 if (attr->srq_limit >= srq->msrq.max)
234 mutex_lock(&srq->mutex);
235 ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
236 mutex_unlock(&srq->mutex);
245 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
247 struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
248 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
252 ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
256 srq_attr->srq_limit = limit_watermark;
257 srq_attr->max_wr = srq->msrq.max - 1;
258 srq_attr->max_sge = srq->msrq.max_gs;
263 int mlx4_ib_destroy_srq(struct ib_srq *srq)
265 struct mlx4_ib_dev *dev = to_mdev(srq->device);
266 struct mlx4_ib_srq *msrq = to_msrq(srq);
268 mlx4_srq_free(dev->dev, &msrq->msrq);
269 mlx4_mtt_cleanup(dev->dev, &msrq->mtt);
272 mlx4_ib_db_unmap_user(to_mucontext(srq->uobject->context), &msrq->db);
273 ib_umem_release(msrq->umem);
276 mlx4_buf_free(dev->dev, msrq->msrq.max << msrq->msrq.wqe_shift,
278 mlx4_db_free(dev->dev, &msrq->db);
286 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
288 struct mlx4_wqe_srq_next_seg *next;
290 /* always called with interrupts disabled. */
291 spin_lock(&srq->lock);
293 next = get_wqe(srq, srq->tail);
294 next->next_wqe_index = cpu_to_be16(wqe_index);
295 srq->tail = wqe_index;
297 spin_unlock(&srq->lock);
300 int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
301 struct ib_recv_wr **bad_wr)
303 struct mlx4_ib_srq *srq = to_msrq(ibsrq);
304 struct mlx4_wqe_srq_next_seg *next;
305 struct mlx4_wqe_data_seg *scat;
311 spin_lock_irqsave(&srq->lock, flags);
313 for (nreq = 0; wr; ++nreq, wr = wr->next) {
314 if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
320 if (unlikely(srq->head == srq->tail)) {
326 srq->wrid[srq->head] = wr->wr_id;
328 next = get_wqe(srq, srq->head);
329 srq->head = be16_to_cpu(next->next_wqe_index);
330 scat = (struct mlx4_wqe_data_seg *) (next + 1);
332 for (i = 0; i < wr->num_sge; ++i) {
333 scat[i].byte_count = cpu_to_be32(wr->sg_list[i].length);
334 scat[i].lkey = cpu_to_be32(wr->sg_list[i].lkey);
335 scat[i].addr = cpu_to_be64(wr->sg_list[i].addr);
338 if (i < srq->msrq.max_gs) {
339 scat[i].byte_count = 0;
340 scat[i].lkey = cpu_to_be32(MLX4_INVALID_LKEY);
346 srq->wqe_ctr += nreq;
349 * Make sure that descriptors are written before
354 *srq->db.db = cpu_to_be32(srq->wqe_ctr);
357 spin_unlock_irqrestore(&srq->lock, flags);