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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | NOTES | SEE ALSO | AUTHOR | COLOPHON |
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IBV_ATTACH_MCAST(3) Libibverbs Programmer’s Manual IBV_ATTACH_MCAST(3)
ibv_attach_mcast, ibv_detach_mcast - attach and detach a queue
pair (QPs) to/from a multicast group
#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);
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.
ibv_attach_mcast() and ibv_detach_mcast() returns 0 on success, or
the value of errno on failure (which indicates the failure
reason).
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.
ibv_create_qp(3)
Dotan Barak ⟨dotanba@gmail.com⟩
This page is part of the rdma-core (RDMA Core Userspace Libraries
and Daemons) project. Information about the project can be found
at ⟨https://github.com/linux-rdma/rdma-core⟩. If you have a bug
report for this manual page, send it to
linux-rdma@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨https://github.com/linux-rdma/rdma-core.git⟩ on 2025-08-11. (At
that time, the date of the most recent commit that was found in
the repository was 2025-08-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
libibverbs 2006-10-31 IBV_ATTACH_MCAST(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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