rdma_create

Allocates a QP.

Syntax

#include <rdma/rdma_cma.h>
int rdma_create_qp(struct rdma_cm_id *id, struct ibv_pd *pd, struct ibv_qp_init_attr *qp_init_attr);

The rdma_create_qp function allocates a QP associated with a specified rdma_cm_id, and transitions it for sending and receiving.

Notes:

The rdma_cm_id must be bound to a local RDMA device before calling the rdma_create_qp function, and the protection domain must be for that same device.
QPs allocated to an rdma_cm_id are automatically transitioned by the librdmacm through their states. After being allocated, the QP is ready to handle posting of receives. If the QP is unconnected, it will be ready to post sends.

id	Specifies the communication identifier to destroy.
pd	Specifies the protection domain for the QP.
qp_init_attr	Specifies the initial QP attributes.

The rdma_create_qp function returns the following values:

0	On success.
-1	Error, see errno.
-EINVAL	If the id, pd, or qp_init_attr parameter is NULL or bad parameter in ibv_qp_init_attr such as, cap.max_inline_data limited to 64 for Chelsio Boards.
-ENOMEM	There is not enough space to allocate by malloc.