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vdpa/mlx5: Make VIRTIO_NET_F_MRG_RXBUF off by default

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Following patch adds driver support for VIRTIO_NET_F_MRG_RXBUF.

Current firmware versions show degradation in packet rate when using
MRG_RXBUF. Users who favor memory saving over packet rate could enable
this feature but we want to keep it off by default.

One can still enable it when creating the vdpa device using vdpa tool by
providing features that include it.

For example:
$ vdpa dev add name vdpa0 mgmtdev pci/0000:86:00.2 device_features 0x300cb982b

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Message-Id: <20230321112809.221432-2-elic@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
This commit is contained in:
Eli Cohen 2023-03-21 13:28:08 +02:00 committed by Michael S. Tsirkin
parent a084983dcd
commit 791a1cb7b8
1 changed files with 2 additions and 0 deletions
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2
drivers/vdpa/mlx5/net/mlx5_vnet.c
View file

@ -3158,6 +3158,8 @@ static int mlx5_vdpa_dev_add(struct vdpa_mgmt_dev *v_mdev, const char *name,
return -EINVAL;
}
device_features &= add_config->device_features;
} else {
device_features &= ~BIT_ULL(VIRTIO_NET_F_MRG_RXBUF);
}
if (!(device_features & BIT_ULL(VIRTIO_F_VERSION_1) &&
device_features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM))) {