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The currently attached transport for a PF_RDS socket may be obtained from user space by invoking getsockopt(2) using the SO_RDS_TRANSPORT option at the SOL_RDS level. The integer optval returned will be one of the RDS_TRANS_* constants defined in linux/rds.h. Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>