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