From: Blanco Alcaine Hector <hector.blanco.alcaine@xxxxxxxxx> Add description on default Rx Queue, including the get and set method, into documentation. Signed-off-by: Blanco Alcaine Hector <hector.blanco.alcaine@xxxxxxxxx> Signed-off-by: Song Yoong Siang <yoong.siang.song@xxxxxxxxx> --- .../device_drivers/ethernet/intel/igc.rst | 21 +++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/Documentation/networking/device_drivers/ethernet/intel/igc.rst b/Documentation/networking/device_drivers/ethernet/intel/igc.rst index 08b2cfacc7c0..bef396d9ec53 100644 --- a/Documentation/networking/device_drivers/ethernet/intel/igc.rst +++ b/Documentation/networking/device_drivers/ethernet/intel/igc.rst @@ -63,6 +63,27 @@ diagnostics, as well as displaying statistical information. The latest ethtool version is required for this functionality. Download it at: https://www.kernel.org/pub/software/network/ethtool/ +Default Rx queue selection +-------------------------- +In Multiple Receive Queues modes, ingress traffic may be redirected to specific +Rx queue based on different programmable filters. + +When none of the filters is matched, the incoming frame will be redirected to +the "Default Rx queue", which is Rx Queue 0 by default. + +For configurations where Queue 0 pair is used for high priority traffic (like +AF_XDP), this may not be desirable. To address this, the driver provides the +option to modify the default Rx queue via sysfs. + +A sysfs attribute "default_rx_queue" is available under /sys/devices. E.g.: +/sys/devices/pci0000:00/.../default_rx_queue + +To check the currently configured default Rx queue: +cat /sys/devices/pci0000:00/.../default_rx_queue + +To set the default queue to a desired value, for example 3: +echo 3 > /sys/devices/pci0000:00/.../default_rx_queue + Support ======= -- 2.34.1
