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mlx5dv_map_ah_to_qp(3) — Linux manual page

mlx5dv_map_ah_to_qp(3)mlx5dv_map_ah_to_qp(3)

NAME        top

       mlx5dv_map_ah_to_qp - Map the destination path information in       address handle (AH) to the information extracted from the qp.

SYNOPSIS        top

              #include <infiniband/mlx5dv.h>              int mlx5dv_map_ah_to_qp(struct ibv_ah *ah, uint32_t qp_num);

DESCRIPTION        top

       This API maps the destination path information in address handle       (ah) to the information extracted from the qp (e.g. congestion       control from ECE).       This API serves as an enhancement to DC and UD QPs to achieve       better performance by using per-address congestion control (CC)       algorithms, enabling DC/UD QPs to use multiple CC algorithms in       the same datacenter.       The mapping created by this API is implicitly destroyed when the       address handle is destroyed.  It is not affected by the       destruction of QPqp_num.       A duplicate mapping to the same address handle is ignored.  As       this API is just a hint for the hardware in this case it would do       nothing and return success regardless of the new qp_num ECE.       The function must be called after ECE negotiation/preconfiguration       was done by some external means.

ARGUMENTS        top

ah     The target’s address handle.qp_num The initiator QP from which congestion control information              is extracted from its ECE.

RETURN VALUE        top

       Upon success, returns 0; Upon failure, the value of errno is       returned.

SEE ALSO        top

rdma_cm(7),rdma_get_remote_ece(3),ibv_query_ece(3),ibv_set_ece(3)

AUTHOR        top

       Yochai Cohen ⟨yochai@nvidia.com⟩       Patrisious Haddad ⟨phaddad@nvidia.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.orgmlx5dv_map_ah_to_qp(3)

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