hw/mlx4/srq.c

35 #include <linux/mlx4/srq.h>
42 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
44 	return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
47 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)
50 	struct ib_srq *ibsrq = &to_mibsrq(srq)->ibsrq;
54 		event.element.srq = ibsrq;
64 			       "on SRQ %06x\n", type, srq->srqn);
79 	struct mlx4_ib_srq *srq = to_msrq(ib_srq);
98 	mutex_init(&srq->mutex);
99 	spin_lock_init(&srq->lock);
100 	srq->msrq.max    = roundup_pow_of_two(init_attr->attr.max_wr + 1);
101 	srq->msrq.max_gs = init_attr->attr.max_sge;
105 					   srq->msrq.max_gs *
107 	srq->msrq.wqe_shift = ilog2(desc_size);
109 	buf_size = srq->msrq.max * desc_size;
117 		srq->umem =
119 		if (IS_ERR(srq->umem))
120 			return PTR_ERR(srq->umem);
123 			dev->dev, ib_umem_num_dma_blocks(srq->umem, PAGE_SIZE),
124 			PAGE_SHIFT, &srq->mtt);
128 		err = mlx4_ib_umem_write_mtt(dev, &srq->mtt, srq->umem);
132 		err = mlx4_ib_db_map_user(udata, ucmd.db_addr, &srq->db);
136 		err = mlx4_db_alloc(dev->dev, &srq->db, 0);
140 		*srq->db.db = 0;
143 				   &srq->buf)) {
148 		srq->head    = 0;
149 		srq->tail    = srq->msrq.max - 1;
150 		srq->wqe_ctr = 0;
152 		for (i = 0; i < srq->msrq.max; ++i) {
153 			next = get_wqe(srq, i);
155 				cpu_to_be16((i + 1) & (srq->msrq.max - 1));
163 		err = mlx4_mtt_init(dev->dev, srq->buf.npages, srq->buf.page_shift,
164 				    &srq->mtt);
168 		err = mlx4_buf_write_mtt(dev->dev, &srq->mtt, &srq->buf);
172 		srq->wrid = kvmalloc_array(srq->msrq.max,
174 		if (!srq->wrid) {
186 			     &srq->mtt, srq->db.dma, &srq->msrq);
190 	srq->msrq.event = mlx4_ib_srq_event;
191 	srq->ibsrq.ext.xrc.srq_num = srq->msrq.srqn;
194 		if (ib_copy_to_udata(udata, &srq->msrq.srqn, sizeof (__u32))) {
199 	init_attr->attr.max_wr = srq->msrq.max - 1;
205 		mlx4_ib_db_unmap_user(ucontext, &srq->db);
207 		kvfree(srq->wrid);
210 	mlx4_mtt_cleanup(dev->dev, &srq->mtt);
213 	if (!srq->umem)
214 		mlx4_buf_free(dev->dev, buf_size, &srq->buf);
215 	ib_umem_release(srq->umem);
219 		mlx4_db_free(dev->dev, &srq->db);
228 	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
236 		if (attr->srq_limit >= srq->msrq.max)
239 		mutex_lock(&srq->mutex);
240 		ret = mlx4_srq_arm(dev->dev, &srq->msrq, attr->srq_limit);
241 		mutex_unlock(&srq->mutex);
253 	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
257 	ret = mlx4_srq_query(dev->dev, &srq->msrq, &limit_watermark);
262 	srq_attr->max_wr    = srq->msrq.max - 1;
263 	srq_attr->max_sge   = srq->msrq.max_gs;
268 int mlx4_ib_destroy_srq(struct ib_srq *srq, struct ib_udata *udata)
270 	struct mlx4_ib_dev *dev = to_mdev(srq->device);
271 	struct mlx4_ib_srq *msrq = to_msrq(srq);
293 void mlx4_ib_free_srq_wqe(struct mlx4_ib_srq *srq, int wqe_index)
298 	spin_lock(&srq->lock);
300 	next = get_wqe(srq, srq->tail);
302 	srq->tail = wqe_index;
304 	spin_unlock(&srq->lock);
310 	struct mlx4_ib_srq *srq = to_msrq(ibsrq);
319 	spin_lock_irqsave(&srq->lock, flags);
327 		if (unlikely(wr->num_sge > srq->msrq.max_gs)) {
333 		if (unlikely(srq->head == srq->tail)) {
339 		srq->wrid[srq->head] = wr->wr_id;
341 		next      = get_wqe(srq, srq->head);
342 		srq->head = be16_to_cpu(next->next_wqe_index);
351 		if (i < srq->msrq.max_gs) {
359 		srq->wqe_ctr += nreq;
367 		*srq->db.db = cpu_to_be32(srq->wqe_ctr);
371 	spin_unlock_irqrestore(&srq->lock, flags);