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vdpa/mlx5: fix UAR allocation

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This patch provides the UAR allocation workaround for the
hosts where UAR allocation with Write-Combining memory
mapping type fails.

Fixes: 8395927cdfaf ("vdpa/mlx5: prepare HW queues")
Cc: stable@dpdk.org

Signed-off-by: Viacheslav Ovsiienko <viacheslavo@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>
This commit is contained in:
Viacheslav Ovsiienko 2020-11-10 16:04:18 +00:00 committed by Thomas Monjalon
parent e8f05161eb
commit b9aa4ba7ce
1 changed files with 6 additions and 1 deletions
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7
drivers/vdpa/mlx5/mlx5_vdpa_event.c
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@ -77,7 +77,12 @@ mlx5_vdpa_event_qp_global_prepare(struct mlx5_vdpa_priv *priv)
DRV_LOG(ERR, "Failed to change event channel FD.");
goto error;
}
priv->uar = mlx5_glue->devx_alloc_uar(priv->ctx, 0);
/*
* This PMD always claims the write memory barrier on UAR
* registers writings, it is safe to allocate UAR with any
* memory mapping type.
*/
priv->uar = mlx5_devx_alloc_uar(priv->ctx, -1);
if (!priv->uar) {
rte_errno = errno;
DRV_LOG(ERR, "Failed to allocate UAR.");