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 multi-
cast 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 multi-
cast group must be sent to the subnet administrator (SA), so that the
fabric’s multicast routing is configured to deliver messages to the lo-
cal port.
SEE ALSO
ibv_create_qp(3)
AUTHOR
Dotan Barak <dotanba@gmail.com>
libibverbs 2006-10-31 IBV_ATTACH_MCAST(3)
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