01-19-2005
The interface is chosen using the IP routing table.
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LEARN ABOUT CENTOS
ibv_detach_mcast
IBV_ATTACH_MCAST(3) Libibverbs Programmer's Manual IBV_ATTACH_MCAST(3)
NAME
ibv_attach_mcast, ibv_detach_mcast - attach and detach a queue pair (QPs) to/from a multicast group
SYNOPSIS
#include <infiniband/verbs.h>
int ibv_attach_mcast(struct ibv_qp *qp, const union ibv_gid *gid,
uint16_t lid);
int ibv_detach_mcast(struct ibv_qp *qp, const union ibv_gid *gid,
uint16_t lid);
DESCRIPTION
ibv_attach_mcast() attaches the QP qp to the multicast group having MGID gid and MLID lid.
ibv_detach_mcast() detaches the QP qp to the multicast group having MGID gid and MLID lid.
RETURN VALUE
ibv_attach_mcast() and ibv_detach_mcast() returns 0 on success, or the value of errno on failure (which indicates the failure reason).
NOTES
Only QPs of Transport Service Type IBV_QPT_UD may be attached to multicast groups.
If a QP is attached to the same multicast group multiple times, the QP will still receive a single copy of a multicast message.
In order to receive multicast messages, a join request for the multicast group must be sent to the subnet administrator (SA), so that the
fabric's multicast routing is configured to deliver messages to the local port.
SEE ALSO
ibv_create_qp(3)
AUTHORS
Dotan Barak <dotanba@gmail.com>
libibverbs 2006-10-31 IBV_ATTACH_MCAST(3)