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download PDF document: rdma_create_ep.3.pdf

RDMA_CREATE_EP(3) Librdmacm Programmer's Manual RDMA_CREATE_EP(3)
NAME rdma_create_ep - Allocate a communication identifier and optional QP.
SYNOPSIS #include <rdma/rdma_cma.h>
int rdma_create_ep (struct rdma_cm_id **id, struct rdma_addrinfo *res, struct ibv_pd *pd, struct ibv_qp_init_attr *qp_init_attr);
ARGUMENTS id A reference where the allocated communication identifier will be returned.
res Address information associated with the rdma_cm_id returned from rdma_getaddrinfo.
pd Optional protection domain if a QP is associated with the rdma_cm_id.
qp_init_attr Optional initial QP attributes.
DESCRIPTION Creates an identifier that is used to track communication information.
RETURN VALUE Returns 0 on success, or -1 on error. If an error occurs, errno will be set to indicate the failure reason.
NOTES After resolving address information using rdma_getaddrinfo, a user may use this call to allocate an rdma_cm_id based on the results.
If the rdma_cm_id will be used on the active side of a connection, meaning that res->ai_flag does not have RAI_PASSIVE set, rdma_create_ep will automatically create a QP on the rdma_cm_id if qp_init_attr is not NULL. The QP will be associated with the specified protection domain, if provided, or a default protection domain if not. Users should see rdma_create_qp for details on the use of the pd and qp_init_attr parameters. After calling rdma_create_ep, the returned rdma_cm_id may be connected by calling rdma_connect. The active side calls rdma_resolve_addr and rdma_resolve_route are not necessary.
If the rdma_cm_id will be used on the passive side of a connection, indicated by having res->ai_flag RAI_PASSIVE set, this call will save the provided pd and qp_init_attr parameters. When a new connection request is retrieved by calling rdma_get_request, the rdma_cm_id associated with the new connection will automatically be associated with a QP using the pd and qp_init_attr parameters. After calling rdma_create_ep, the returned rdma_cm_id may be placed into a listening state by immediately calling rdma_listen. The passive side call rdma_bind_addr is not necessary. Connection requests may then be retrieved by calling rdma_get_request.
The newly created rdma_cm_id will be set to use synchronous operation. Users that wish asynchronous operation must migrate the rdma_cm_id to a user created event channel using rdma_migrate_id.
librdmacm 2010-07-19 RDMA_CREATE_EP(3)