[dpdk-dev] [PATCH v2 15/17] common/mlx5: share DevX RQ creation

[Michael Baum <michaelba@nvidia.com>]

The RQ object in DevX is used currently only in net driver, but it share
for future.

Add a structure that contains all the resources, and provide creation
and release functions for it.

Signed-off-by: Michael Baum <michaelba@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
---
 drivers/common/mlx5/mlx5_common_devx.c | 116 +++++++++++++++++++++++++++++++++
 drivers/common/mlx5/mlx5_common_devx.h |  11 ++++
 2 files changed, 127 insertions(+)

diff --git a/drivers/common/mlx5/mlx5_common_devx.c b/drivers/common/mlx5/mlx5_common_devx.c
index 652bc9a..a66b838 100644
--- a/drivers/common/mlx5/mlx5_common_devx.c
+++ b/drivers/common/mlx5/mlx5_common_devx.c
@@ -276,4 +276,120 @@
 	return -rte_errno;
 }
 
+/**
+ * Destroy DevX Receive Queue.
+ *
+ * @param[in] rq
+ *   DevX RQ to destroy.
+ */
+void
+mlx5_devx_rq_destroy(struct mlx5_devx_rq *rq)
+{
+	if (rq->rq)
+		claim_zero(mlx5_devx_cmd_destroy(rq->rq));
+	if (rq->umem_obj)
+		claim_zero(mlx5_glue->devx_umem_dereg(rq->umem_obj));
+	if (rq->umem_buf)
+		mlx5_free((void *)(uintptr_t)rq->umem_buf);
+}
+
+/**
+ * Create Receive Queue using DevX API.
+ *
+ * Get a pointer to partially initialized attributes structure, and updates the
+ * following fields:
+ *   wq_umem_valid
+ *   wq_umem_id
+ *   wq_umem_offset
+ *   dbr_umem_valid
+ *   dbr_umem_id
+ *   dbr_addr
+ *   log_wq_pg_sz
+ * All other fields are updated by caller.
+ *
+ * @param[in] ctx
+ *   Context returned from mlx5 open_device() glue function.
+ * @param[in/out] rq_obj
+ *   Pointer to RQ to create.
+ * @param[in] wqe_size
+ *   Size of WQE structure.
+ * @param[in] log_wqbb_n
+ *   Log of number of WQBBs in queue.
+ * @param[in] attr
+ *   Pointer to RQ attributes structure.
+ * @param[in] socket
+ *   Socket to use for allocation.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_devx_rq_create(void *ctx, struct mlx5_devx_rq *rq_obj, uint32_t wqe_size,
+		    uint16_t log_wqbb_n,
+		    struct mlx5_devx_create_rq_attr *attr, int socket)
+{
+	struct mlx5_devx_obj *rq = NULL;
+	struct mlx5dv_devx_umem *umem_obj = NULL;
+	void *umem_buf = NULL;
+	size_t page_size = rte_mem_page_size();
+	size_t alignment = MLX5_WQE_BUF_ALIGNMENT;
+	uint32_t umem_size, umem_dbrec;
+	uint16_t rq_size = 1 << log_wqbb_n;
+	int ret;
+
+	if (page_size == (size_t)-1 || alignment == (size_t)-1) {
+		DRV_LOG(ERR, "Failed to get page_size.");
+		rte_errno = ENOMEM;
+		return -rte_errno;
+	}
+	/* Allocate memory buffer for WQEs and doorbell record. */
+	umem_size = wqe_size * rq_size;
+	umem_dbrec = RTE_ALIGN(umem_size, MLX5_DBR_SIZE);
+	umem_size += MLX5_DBR_SIZE;
+	umem_buf = mlx5_malloc(MLX5_MEM_RTE | MLX5_MEM_ZERO, umem_size,
+			       alignment, socket);
+	if (!umem_buf) {
+		DRV_LOG(ERR, "Failed to allocate memory for RQ.");
+		rte_errno = ENOMEM;
+		return -rte_errno;
+	}
+	/* Register allocated buffer in user space with DevX. */
+	umem_obj = mlx5_glue->devx_umem_reg(ctx, (void *)(uintptr_t)umem_buf,
+					    umem_size, 0);
+	if (!umem_obj) {
+		DRV_LOG(ERR, "Failed to register umem for RQ.");
+		rte_errno = errno;
+		goto error;
+	}
+	/* Fill attributes for RQ object creation. */
+	attr->wq_attr.wq_umem_valid = 1;
+	attr->wq_attr.wq_umem_id = mlx5_os_get_umem_id(umem_obj);
+	attr->wq_attr.wq_umem_offset = 0;
+	attr->wq_attr.dbr_umem_valid = 1;
+	attr->wq_attr.dbr_umem_id = attr->wq_attr.wq_umem_id;
+	attr->wq_attr.dbr_addr = umem_dbrec;
+	attr->wq_attr.log_wq_pg_sz = rte_log2_u32(page_size);
+	/* Create receive queue object with DevX. */
+	rq = mlx5_devx_cmd_create_rq(ctx, attr, socket);
+	if (!rq) {
+		DRV_LOG(ERR, "Can't create DevX RQ object.");
+		rte_errno = ENOMEM;
+		goto error;
+	}
+	rq_obj->umem_buf = umem_buf;
+	rq_obj->umem_obj = umem_obj;
+	rq_obj->rq = rq;
+	rq_obj->db_rec = RTE_PTR_ADD(rq_obj->umem_buf, umem_dbrec);
+	return 0;
+error:
+	ret = rte_errno;
+	if (rq)
+		claim_zero(mlx5_devx_cmd_destroy(rq));
+	if (umem_obj)
+		claim_zero(mlx5_glue->devx_umem_dereg(umem_obj));
+	if (umem_buf)
+		mlx5_free((void *)(uintptr_t)umem_buf);
+	rte_errno = ret;
+	return -rte_errno;
+}
 
diff --git a/drivers/common/mlx5/mlx5_common_devx.h b/drivers/common/mlx5/mlx5_common_devx.h
index 8377d34..1dafbf5 100644
--- a/drivers/common/mlx5/mlx5_common_devx.h
+++ b/drivers/common/mlx5/mlx5_common_devx.h
@@ -30,6 +30,13 @@ struct mlx5_devx_sq {
 	volatile uint32_t *db_rec; /* The SQ doorbell record. */
 };
 
+/* DevX Receive Queue structure. */
+struct mlx5_devx_rq {
+	struct mlx5_devx_obj *rq; /* The RQ DevX object. */
+	struct mlx5dv_devx_umem *umem_obj; /* The RQ umem object. */
+	volatile void *umem_buf;
+	volatile uint32_t *db_rec; /* The RQ doorbell record. */
+};
 
 /* mlx5_common_devx.c */
 
@@ -41,5 +48,9 @@ int mlx5_devx_cq_create(void *ctx, struct mlx5_devx_cq *cq_obj,
 int mlx5_devx_sq_create(void *ctx, struct mlx5_devx_sq *sq_obj,
 			uint16_t log_wqbb_n,
 			struct mlx5_devx_create_sq_attr *attr, int socket);
+void mlx5_devx_rq_destroy(struct mlx5_devx_rq *rq);
+int mlx5_devx_rq_create(void *ctx, struct mlx5_devx_rq *rq_obj,
+			uint32_t wqe_size, uint16_t log_wqbb_n,
+			struct mlx5_devx_create_rq_attr *attr, int socket);
 
 #endif /* RTE_PMD_MLX5_COMMON_DEVX_H_ */
-- 
1.8.3.1