NAME

ionic_dv_pd_set_udma_mask - Restrict UDMA pipeline IDs of a protection domain

SYNOPSIS

#include <infiniband/ionic_dv.h>
int ionic_dv_pd_set_udma_mask(struct ibv_pd *ibpd, uint8_t udma_mask);

DESCRIPTION

ionic_dv_pd_set_udma_mask() restricts the UDMA pipelines available for queues created under the protection domain or parent domain ibpd. Queues created after this call will be assigned to one of the pipelines enabled by udma_mask.

The udma_mask must be a subset of the device’s available UDMA pipelines, as returned by ionic_dv_ctx_get_udma_mask(3).

Changing the UDMA mask of a protection domain has no effect on previously created queues.

The recommended usage pattern is:

1.

Create a protection domain with ibv_alloc_pd(3).

2.

Create parent domains of that PD for each desired UDMA mask using ibv_alloc_parent_domain(3).

3.

Set the desired UDMA mask on each parent domain with this function.

4.

Create queues associated with the parent domain that has the desired UDMA mask.

An alternative usage is to create a single PD and change its UDMA mask before creating each queue.

ARGUMENTS

ibpd

The protection domain or parent domain to modify. Must be an ionic protection domain.

udma_mask

A bitmask of UDMA pipeline IDs to enable. Must be a subset of the mask returned by ionic_dv_ctx_get_udma_mask(3).

RETURN VALUE

Returns 0 on success, or a positive errno value on failure:

EPERM

ibpd is not an ionic protection domain.

EINVAL

udma_mask contains bits not present in the device’s UDMA mask.

SEE ALSO

ionicdv(7), ionic_dv_pd_get_udma_mask(3), ionic_dv_ctx_get_udma_mask(3), ionic_dv_ctx_get_udma_count(3), ibv_alloc_pd(3), ibv_alloc_parent_domain(3)

AUTHORS

Advanced Micro Devices, Inc.