Re: [Intel-wired-lan] [PATCH iwl-next, v3 2/2] igc: Add wildcard rule support to ethtool NFC using Default Queue

[Mor Bar-Gabay <morx.bar.gabay@intel.com>]

On 20/06/2025 13:02, Song Yoong Siang wrote:
> Introduce support for a lowest priority wildcard (catch-all) rule in
> ethtool's Network Flow Classification (NFC) for the igc driver. The
> wildcard rule directs all unmatched network traffic, including traffic not
> captured by Receive Side Scaling (RSS), to a specified queue. This
> functionality utilizes the Default Queue feature available in I225/I226
> hardware.
> 
> The implementation has been validated on Intel ADL-S systems with two
> back-to-back connected I226 network interfaces.
> 
> Testing Procedure:
> 1. On the Device Under Test (DUT), verify the initial statistic:
>     $ ethtool -S enp1s0 | grep rx_q.*packets
>          rx_queue_0_packets: 0
>          rx_queue_1_packets: 0
>          rx_queue_2_packets: 0
>          rx_queue_3_packets: 0
> 
> 2. From the Link Partner, send 10 ARP packets:
>     $ arping -c 10 -I enp170s0 169.254.1.2
> 
> 3. On the DUT, verify the packet reception on Queue 0:
>     $ ethtool -S enp1s0 | grep rx_q.*packets
>          rx_queue_0_packets: 10
>          rx_queue_1_packets: 0
>          rx_queue_2_packets: 0
>          rx_queue_3_packets: 0
> 
> 4. On the DUT, add a wildcard rule to route all packets to Queue 3:
>     $ sudo ethtool -N enp1s0 flow-type ether queue 3
> 
> 5. From the Link Partner, send another 10 ARP packets:
>     $ arping -c 10 -I enp170s0 169.254.1.2
> 
> 6. Now, packets are routed to Queue 3 by the wildcard (Default Queue) rule:
>     $ ethtool -S enp1s0 | grep rx_q.*packets
>          rx_queue_0_packets: 10
>          rx_queue_1_packets: 0
>          rx_queue_2_packets: 0
>          rx_queue_3_packets: 10
> 
> 7. On the DUT, add a EtherType rule to route ARP packet to Queue 1:
>     $ sudo ethtool -N enp1s0 flow-type ether proto 0x0806 queue 1
> 
> 8. From the Link Partner, send another 10 ARP packets:
>     $ arping -c 10 -I enp170s0 169.254.1.2
> 
> 9. Now, packets are routed to Queue 1 by the EtherType rule because it is
>     higher priority than the wildcard (Default Queue) rule:
>     $ ethtool -S enp1s0 | grep rx_q.*packets
>          rx_queue_0_packets: 10
>          rx_queue_1_packets: 10
>          rx_queue_2_packets: 0
>          rx_queue_3_packets: 10
> 
> 10. On the DUT, delete all the NFC rules:
>      $ sudo ethtool -N enp1s0 delete 63
>      $ sudo ethtool -N enp1s0 delete 64
> 
> 11. From the Link Partner, send another 10 ARP packets:
>      $ arping -c 10 -I enp170s0 169.254.1.2
> 
> 12. Now, packets are routed to Queue 0 because the value of Default Queue
>      is reset back to 0:
>      $ ethtool -S enp1s0 | grep rx_q.*packets
>           rx_queue_0_packets: 20
>           rx_queue_1_packets: 10
>           rx_queue_2_packets: 0
>           rx_queue_3_packets: 10
> 
> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de>
> Co-developed-by: Blanco Alcaine Hector <hector.blanco.alcaine@intel.com>
> Signed-off-by: Blanco Alcaine Hector <hector.blanco.alcaine@intel.com>
> Signed-off-by: Song Yoong Siang <yoong.siang.song@intel.com>
> ---
>   drivers/net/ethernet/intel/igc/igc.h         | 11 +++++++---
>   drivers/net/ethernet/intel/igc/igc_defines.h |  1 +
>   drivers/net/ethernet/intel/igc/igc_ethtool.c | 18 ++++++++++++++++
>   drivers/net/ethernet/intel/igc/igc_main.c    | 22 ++++++++++++++++++++
>   4 files changed, 49 insertions(+), 3 deletions(-)
> 
Tested-by: Mor Bar-Gabay <morx.bar.gabay@intel.com>