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ibv_modify_srq(3) — Linux manual page

IBV_MODIFY_SRQ(3)     Libibverbs Programmer's ManualIBV_MODIFY_SRQ(3)

NAME        top

       ibv_modify_srq - modify attributes of a shared receive queue (SRQ)

SYNOPSIS        top

#include <infiniband/verbs.h>int ibv_modify_srq(struct ibv_srq*srq,struct ibv_srq_attr*srq_attr,intsrq_attr_mask);

DESCRIPTION        top

ibv_modify_srq()modifies the attributes of SRQsrq with the       attributes insrq_attr according to the masksrq_attr_mask.  The       argumentsrq_attr is an ibv_srq_attr struct, as defined in       <infiniband/verbs.h>.       struct ibv_srq_attr {               uint32_t                max_wr;      /* maximum number of outstanding work requests (WRs) in the SRQ */               uint32_t                max_sge;     /* number of scatter elements per WR (irrelevant for ibv_modify_srq) */               uint32_t                srq_limit;   /* the limit value of the SRQ */       };       The argumentsrq_attr_mask specifies the SRQ attributes to be       modified.  The argument is either 0 or the bitwise OR of one or       more of the following flags:IBV_SRQ_MAX_WRResize the SRQIBV_SRQ_LIMITSet the SRQ limit

RETURN VALUE        top

ibv_modify_srq()returns 0 on success, or the value of errno on       failure (which indicates the failure reason).

NOTES        top

       If any of the modify attributes is invalid, none of the attributes       will be modified.       Not all devices support resizing SRQs.  To check if a device       supports it, check if theIBV_DEVICE_SRQ_RESIZEbit is set in the       device capabilities flags.       Modifying the srq_limit arms the SRQ to produce anIBV_EVENT_SRQ_LIMIT_REACHED"low watermark" asynchronous event       once the number of WRs in the SRQ drops below srq_limit.

SEE ALSO        top

ibv_query_device(3),ibv_create_srq(3),ibv_destroy_srq(3),ibv_query_srq(3)

AUTHORS        top

       Dotan Barak <dotanba@gmail.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.orglibibverbs                      2006-10-31IBV_MODIFY_SRQ(3)

Pages that refer to this page:ibv_create_srq(3), ibv_create_srq_ex(3), ibv_get_srq_num(3), ibv_query_srq(3)

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