On Fri, Feb 28, 2025 at 2:50 AM Joe Damato <jdamato@xxxxxxxxxx> wrote:
>
> Use netif_queue_set_napi to map NAPIs to queue IDs so that the mapping
> can be accessed by user apps. Note that the netif_queue_set_napi
> currently requires RTNL, so care must be taken to ensure RTNL is held on
> paths where this API might be reached.
>
> The paths in the driver where this API can be reached appear to be:
>
> - ndo_open, ndo_close, which hold RTNL so no driver change is needed.
> - rx_pause, rx_resume, tx_pause, tx_resume are reached either via
> an ethtool ioctl or via XSK - neither path requires a driver change.
> - power management paths (which call open and close), which have been
> updated to hold/release RTNL.
> - refill_work, which has been updated to hold RTNL.
>
> $ ethtool -i ens4 | grep driver
> driver: virtio_net
>
> $ sudo ethtool -L ens4 combined 4
>
> $ ./tools/net/ynl/pyynl/cli.py \
> --spec Documentation/netlink/specs/netdev.yaml \
> --dump queue-get --json='{"ifindex": 2}'
> [{'id': 0, 'ifindex': 2, 'napi-id': 8289, 'type': 'rx'},
> {'id': 1, 'ifindex': 2, 'napi-id': 8290, 'type': 'rx'},
> {'id': 2, 'ifindex': 2, 'napi-id': 8291, 'type': 'rx'},
> {'id': 3, 'ifindex': 2, 'napi-id': 8292, 'type': 'rx'},
> {'id': 0, 'ifindex': 2, 'type': 'tx'},
> {'id': 1, 'ifindex': 2, 'type': 'tx'},
> {'id': 2, 'ifindex': 2, 'type': 'tx'},
> {'id': 3, 'ifindex': 2, 'type': 'tx'}]
>
> Note that virtio_net has TX-only NAPIs which do not have NAPI IDs, so
> the lack of 'napi-id' in the above output is expected.
>
> Signed-off-by: Joe Damato <jdamato@xxxxxxxxxx>
> ---
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
