C++ (Cpp) mlx5_buf_alloc Examples

Example #1

File: srq.c Project: Cai900205/test

static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
			     struct mlx5_create_srq_mbox_in **in, int buf_size,
			     int *inlen)
{
	int err;
	int i;
	struct mlx5_wqe_srq_next_seg *next;
	int page_shift;
	int npages;

	err = mlx5_db_alloc(dev->mdev, &srq->db);
	if (err) {
		mlx5_ib_warn(dev, "alloc dbell rec failed\n");
		return err;
	}

	*srq->db.db = 0;

	if (mlx5_buf_alloc(dev->mdev, buf_size, PAGE_SIZE * 2, &srq->buf)) {
		mlx5_ib_dbg(dev, "buf alloc failed\n");
		err = -ENOMEM;
		goto err_db;
	}
	page_shift = srq->buf.page_shift;

	srq->head    = 0;
	srq->tail    = srq->msrq.max - 1;
	srq->wqe_ctr = 0;

	for (i = 0; i < srq->msrq.max; i++) {
		next = get_wqe(srq, i);
		next->next_wqe_index =
			cpu_to_be16((i + 1) & (srq->msrq.max - 1));
	}

	npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
	mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
		    buf_size, page_shift, srq->buf.npages, npages);
	*inlen = sizeof(**in) + sizeof(*(*in)->pas) * npages;
	*in = mlx5_vzalloc(*inlen);
	if (!*in) {
		err = -ENOMEM;
		goto err_buf;
	}
	mlx5_fill_page_array(&srq->buf, (*in)->pas);

	srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
	if (!srq->wrid) {
		mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
			    (unsigned long)(srq->msrq.max * sizeof(u64)));
		err = -ENOMEM;
		goto err_in;
	}
	srq->wq_sig = !!srq_signature;

	(*in)->ctx.log_pg_sz = page_shift - MLX5_ADAPTER_PAGE_SHIFT;

	return 0;

err_in:
	mlx5_vfree(*in);

err_buf:
	mlx5_buf_free(dev->mdev, &srq->buf);

err_db:
	mlx5_db_free(dev->mdev, &srq->db);
	return err;
}

Example #2

File: srq.c Project: acton393/linux

static int create_srq_kernel(struct mlx5_ib_dev *dev, struct mlx5_ib_srq *srq,
			     struct mlx5_srq_attr *in, int buf_size)
{
	int err;
	int i;
	struct mlx5_wqe_srq_next_seg *next;
	int page_shift;
	int npages;

	err = mlx5_db_alloc(dev->mdev, &srq->db);
	if (err) {
		mlx5_ib_warn(dev, "alloc dbell rec failed\n");
		return err;
	}

	if (mlx5_buf_alloc(dev->mdev, buf_size, &srq->buf)) {
		mlx5_ib_dbg(dev, "buf alloc failed\n");
		err = -ENOMEM;
		goto err_db;
	}
	page_shift = srq->buf.page_shift;

	srq->head    = 0;
	srq->tail    = srq->msrq.max - 1;
	srq->wqe_ctr = 0;

	for (i = 0; i < srq->msrq.max; i++) {
		next = get_wqe(srq, i);
		next->next_wqe_index =
			cpu_to_be16((i + 1) & (srq->msrq.max - 1));
	}

	npages = DIV_ROUND_UP(srq->buf.npages, 1 << (page_shift - PAGE_SHIFT));
	mlx5_ib_dbg(dev, "buf_size %d, page_shift %d, npages %d, calc npages %d\n",
		    buf_size, page_shift, srq->buf.npages, npages);
	in->pas = mlx5_vzalloc(sizeof(*in->pas) * npages);
	if (!in->pas) {
		err = -ENOMEM;
		goto err_buf;
	}
	mlx5_fill_page_array(&srq->buf, in->pas);

	srq->wrid = kmalloc(srq->msrq.max * sizeof(u64), GFP_KERNEL);
	if (!srq->wrid) {
		mlx5_ib_dbg(dev, "kmalloc failed %lu\n",
			    (unsigned long)(srq->msrq.max * sizeof(u64)));
		err = -ENOMEM;
		goto err_in;
	}
	srq->wq_sig = !!srq_signature;

	in->log_page_size = page_shift - MLX5_ADAPTER_PAGE_SHIFT;
	if (MLX5_CAP_GEN(dev->mdev, cqe_version) == MLX5_CQE_VERSION_V1 &&
	    in->type == IB_SRQT_XRC)
		in->user_index = MLX5_IB_DEFAULT_UIDX;

	return 0;

err_in:
	kvfree(in->pas);

err_buf:
	mlx5_buf_free(dev->mdev, &srq->buf);

err_db:
	mlx5_db_free(dev->mdev, &srq->db);
	return err;
}