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, union ibv_gid *gid,
uint16_t lid);
int ibv_detach_mcast(struct ibv_qp *qp, union ibv_gid *gid,
uint16_t lid);
DESCRIPTIONibv_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 VALUEibv_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
local port.
SEE ALSOibv_create_qp(3)AUTHORS
Dotan Barak <dotanb@mellanox.co.il>
libibverbs 2006-10-31 IBV_ATTACH_MCAST(3)
