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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 indi-
       cates 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 <dotanbaATgmail.com>



libibverbs                        2006-10-31               IBV_ATTACH_MCAST(3)