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rdma_set_option(3) — Linux manual page

RDMA_SET_OPTION(3)    Librdmacm Programmer's ManualRDMA_SET_OPTION(3)

NAME        top

       rdma_set_option - Set communication options for an rdma_cm_id.

SYNOPSIS        top

#include <rdma/rdma_cma.h>int rdma_set_option (struct rdma_cm_id *id, intlevel, intoptname, void *optval, size_toptlen);

ARGUMENTS        top

       id          RDMA identifier.       level       Protocol level of the option to set.       optname     Name of the option, relative to the level, to set.       optval      Reference to the option data.  The data is dependent                   on the level and optname.       optlen      The size of the %optval buffer.

DESCRIPTION        top

       Sets communication options for an rdma_cm_id.  This call is used       to override the default system settings.       optname can be one of       RDMA_OPTION_ID_TOS                   Specify the quality of service provided by a                   connection.  The expected optlen is size of uint8_t.       RDMA_OPTION_ID_REUSEADDR                   Bound the rdma_cm_id to a reuseable address. This will                   allow other users to bind to that same address.  The                   expected optlen is size of int.       RDMA_OPTION_ID_AFONLY                   Set IPV6_V6ONLY socket.  The expected optlen is size                   of int.       RDMA_OPTION_IB_PATH                   Set IB path record data.  The expected optlen is size                   of struct ibv_path_data[].       RDMA_OPTION_ID_ACK_TIMEOUT                   Set QP ACK timeout.  The value calculated according to                   the formula 4.096 * 2^(ack_timeout) usec.

RETURN VALUE        top

       Returns 0 on success, or -1 on error.  If an error occurs, errno       will be set to indicate the failure reason.

NOTES        top

       Option details may be found in the relevant header files.

SEE ALSO        top

rdma_create_id(3)

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.orglibrdmacm                       2007-08-06RDMA_SET_OPTION(3)

Pages that refer to this page:rdma_create_id(3), rdma_cm(7)

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