IBV_ATTACH_MCAST - Online Linux Manual PageSection : 3
Updated : 2006-10-31
Source : libibverbs
Note : Libibverbs Programmer’s Manual

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NAMEibv_attach_mcast, ibv_detach_mcast - attach and detach a queue pair (QPs) to/from a multicast group

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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);

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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.

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RETURN VALUEibv_attach_mcast() and ibv_detach_mcast() returns 0 on success, or the value of errno on failure (which indicates the failure reason).

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NOTESOnly 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.

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SEE ALSOibv_create_qp(3)

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AUTHORDotan Barak <dotanba@gmail.com> 0

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Johanes Gumabo

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