RDMA_RESOLVE_ADDRINFO(3) Librdmacm Programmer's Manual RDMA_RESOLVE_ADDRINFO(3)

RDMA_RESOLVE_ADDRINFO - Resolve RDMA addresses which supports both DNS and IB SA.

#include <rdma/rdma_cma.h>

int rdma_resolve_addrinfo(struct rdma_cm_id *id, const char *node, const char *service, const struct rdma_addrinfo *hints);

id RDMA identifier.

node Optional, name, dotted-decimal IPv4, or IPv6 hex address to resolve.

service The service name or port number of address.

hints Reference to an rdma_addrinfo structure containing hints about the type of service the caller supports.

This call submits an asynchronous address resolution request. The behavior is similar to rdma_getaddrinfo(), except that the operation is asynchronous, generating an event on the RDMA CM event channel that is associated with the specified rdma_cm_id when complete. The %node, %service, and %hints parameters are defined similarly to rdma_getaddrinfo().

Returns 0 on success. Success indicates that asynchronous address resolution was initiated. The result of the resolution, whether successful or failed, will be reported as an event on the related event channel.

Returns -1 on error, errno will be set to indicate the failure reason. The address resolution was not started, and no event will be generated on the event channel.

  • RAI_DNS: Performs address resolution using DNS.
  • RAI_SA: Performs address resolution using the Infiniband SA. The rdma_cm_id associated with the call must be bound to an Infiniband port, or an error will occur. The %node parameter must be null (not supported). %Service should be an IB service name or ID.

These 2 flags are mutual-exclusive; If none of them is set then DNS is the default.

The cm event RDMA_CM_EVENT_ADDRINFO_RESOLVED (on success) or RDMA_CM_EVENT_ADDRINFO_ERROR (on failure) is generated.

rdma_getaddrinfo(3), rdma_query_addrinfo(3)

Mark Zhang <<markzhang@nvidia.com>>

2025-02-06