vdpa/mlx5: Add support for running with virtio_vdpa

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In order to support running vdpa using vritio_vdpa driver, we need  to
create a different kind of MR, one that has 1:1 mapping, since the
addresses referring to virtqueues are dma addresses.

We create the 1:1 MR in mlx5_vdpa_dev_add() only in case firmware
supports the general capability umem_uid_0. The reason for that is that
1:1 MRs must be created with uid == 0 while virtqueue objects can be
created with uid == 0 only when the firmware capability is on.

If the set_map() callback is called with new translations provided
through iotlb, the driver will destroy the 1:1 MR and create a regular
one.

Signed-off-by: Eli Cohen <elic@nvidia.com>
Link: https://lore.kernel.org/r/20210602085854.62690-1-elic@nvidia.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>

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Eli Cohen 2021-06-02 11:58:54 +03:00 • committed by Michael S. Tsirkin

parent 7d23dcdf21

commit 6f5312f801

3 changed files with 87 additions and 15 deletions

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1

drivers/vdpa/mlx5/core/mlx5_vdpa.h

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88

drivers/vdpa/mlx5/core/mr.c

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15

drivers/vdpa/mlx5/net/mlx5_vnet.c

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