mlx5: Add support for ibv_open_qp

Add support to allow the opening of an existing XRC QP. This support existed in downstream mlx5 and is needed to share an XRC Receive QP between processes. Signed-off-by: Steve Welch <[email protected]>
linux-rdma · Sep 24, 2019 · 83b4595 · 83b4595
1 parent 1dafb2f
commit 83b4595
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diff --git a/providers/mlx5/mlx5.c b/providers/mlx5/mlx5.c
@@ -146,6 +146,7 @@ static const struct verbs_context_ops mlx5_ctx_common_ops = {
 	.modify_flow_action_esp = mlx5_modify_flow_action_esp,
 	.modify_qp_rate_limit = mlx5_modify_qp_rate_limit,
 	.modify_wq = mlx5_modify_wq,
+	.open_qp = mlx5_open_qp,
 	.open_xrcd = mlx5_open_xrcd,
 	.post_srq_ops = mlx5_post_srq_ops,
 	.query_device_ex = mlx5_query_device_ex,

diff --git a/providers/mlx5/mlx5.h b/providers/mlx5/mlx5.h
@@ -899,6 +899,8 @@ int mlx5_copy_to_recv_srq(struct mlx5_srq *srq, int idx, void *buf, int size);
 struct ibv_xrcd *mlx5_open_xrcd(struct ibv_context *context,
 				struct ibv_xrcd_init_attr *xrcd_init_attr);
 int mlx5_get_srq_num(struct ibv_srq *srq, uint32_t *srq_num);
+struct ibv_qp *mlx5_open_qp(struct ibv_context *context,
+			    struct ibv_qp_open_attr *attr);
 int mlx5_close_xrcd(struct ibv_xrcd *ib_xrcd);
 struct ibv_wq *mlx5_create_wq(struct ibv_context *context,
 			      struct ibv_wq_init_attr *attr);

diff --git a/providers/mlx5/verbs.c b/providers/mlx5/verbs.c
@@ -2647,6 +2647,30 @@ int mlx5_get_srq_num(struct ibv_srq *srq, uint32_t *srq_num)
 	return 0;
 }
 
+struct ibv_qp *mlx5_open_qp(struct ibv_context *context,
+			    struct ibv_qp_open_attr *attr)
+{
+	struct ibv_open_qp cmd;
+	struct ib_uverbs_create_qp_resp resp;
+	struct mlx5_qp *qp;
+	int ret;
+
+	qp = calloc(1, sizeof(*qp));
+	if (!qp)
+		return NULL;
+
+	ret = ibv_cmd_open_qp(context, &qp->verbs_qp, sizeof(qp->verbs_qp),
+			      attr, &cmd, sizeof(cmd), &resp, sizeof(resp));
+	if (ret)
+		goto err;
+
+	return &qp->verbs_qp.qp;
+
+err:
+	free(qp);
+	return NULL;
+}
+
 struct ibv_xrcd *
 mlx5_open_xrcd(struct ibv_context *context,
 	       struct ibv_xrcd_init_attr *xrcd_init_attr)