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umad_send(3) — Linux manual page

UMAD_SEND(3)            OpenIB Programmer's ManualUMAD_SEND(3)

NAME        top

       umad_send - send umad

SYNOPSIS        top

#include <infiniband/umad.h>int umad_send(intportid, intagentid, void*umad, intlength, inttimeout_ms, intretries);

DESCRIPTION        top

umad_send()sendslength bytes from the specifiedumad buffer from       the port specified byportid, and using the agent specified byagentid.       The buffer can contain a RMPP transmission which is larger than a       single MAD packet when the agentid specifies a class which       utilizes RMPP and the header flags indicate RMPP is active.  NOTE       currently only RMPPFlags.Active is meaningful in the header in       user space.  All other RMPP fields are ignored.  The data section       of the buffer will be sent in multiple RMPP MAD packets with       headers built for the user.timeout_ms controls the solicited MADs behavior as follows: zero       value means not solicited. Positive value makes kernel indicate       timeout in milliseconds. If reply is not received within the       specified value, the original buffer is returned in the read       channel with the status field set (to non zero). Negativetimeout_ms makes kernel wait forever for the reply.retries       indicates the number of times the MAD will be retried before       giving up.

RETURN VALUE        top

umad_send()returns 0 on success; on error, errno is set and a       negative value is returned as follows:        -EINVAL invalid port handle or agentid        -EIO    send operation failed

AUTHOR        top

       Hal Rosenstock <halr@voltaire.com>

COLOPHON        top

       This page is part of therdma-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 isnot part of the original manual page), send a mail to       man-pages@man7.orgOpenIB                         May 11, 2007UMAD_SEND(3)

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