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NAME | SYNOPSIS | DESCRIPTION | ARGUMENTS | RETURN VALUE | SEE ALSO | AUTHOR | COLOPHON |
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mlx5dv_map_ah_to_qp(3) mlx5dv_map_ah_to_qp(3)
mlx5dv_map_ah_to_qp - Map the destination path information in
address handle (AH) to the information extracted from the qp.
#include <infiniband/mlx5dv.h>
int mlx5dv_map_ah_to_qp(struct ibv_ah *ah, uint32_t qp_num);
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 QP qp_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.
ah The target’s address handle.
qp_num The initiator QP from which congestion control information
is extracted from its ECE.
Upon success, returns 0; Upon failure, the value of errno is
returned.
rdma_cm(7), rdma_get_remote_ece(3), ibv_query_ece(3),
ibv_set_ece(3)
Yochai Cohen ⟨yochai@nvidia.com⟩
Patrisious Haddad ⟨phaddad@nvidia.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
mlx5dv_map_ah_to_qp(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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