[PATCH iwl-next,v1 0/3] Add Default Rx Queue Setting for igc driver

[Song Yoong Siang]

This patch set introduces the support to configure default Rx queue during runtime.
A new sysfs attribute "default_rx_queue" has been added, allowing users to check
and modify the default Rx queue.

This patch set is tested on two back-to-back connected i226 on Intel ADL-S systems.

Test Steps and expected results:
1. Check default_rx_queue index:
   @DUT: $ cat /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/default_rx_queue
         0

2. Check statistic of Rx packets:
   @DUT: $ ethtool -S enp2s0 | grep rx.*packets
         rx_packets: 0
         rx_queue_0_packets: 0
         rx_queue_1_packets: 0
         rx_queue_2_packets: 0
         rx_queue_3_packets: 0

3. Send 10 ARP packets:
   @LinkPartner: $ arping -c 10 -I enp170s0 169.254.1.10
                 ARPING 169.254.1.10 from 169.254.1.2 enp170s0
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.725ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.649ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.577ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.611ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.706ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.644ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.648ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.601ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.628ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.641ms
                 Sent 10 probes (1 broadcast(s))
                 Received 10 response(s)

4. Check statistic of Rx packets to make sure packets is received by default queue (RxQ0):
   @DUT: $ ethtool -S enp2s0 | grep rx.*packets
         rx_packets: 10
         rx_queue_0_packets: 10
         rx_queue_1_packets: 0
         rx_queue_2_packets: 0
         rx_queue_3_packets: 0

5. Change default_rx_queue index to Queue 3:
   @DUT: $ echo 3 | sudo tee /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/default_rx_queue
         3
   @DUT: $ cat /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/default_rx_queue
         3

6. Send 10 ARP packets:
   @LinkPartner: $ arping -c 10 -I enp170s0 169.254.1.10
                 ARPING 169.254.1.10 from 169.254.1.2 enp170s0
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.653ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.652ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.653ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.649ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.600ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.698ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.694ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.678ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.609ms
                 Unicast reply from 169.254.1.10 [00:A0:C9:00:00:00]  0.634ms
                 Sent 10 probes (1 broadcast(s))
                 Received 10 response(s)

7. Check statistic of Rx packets to make sure packets is received by new default queue (RxQ3):
   @DUT: $ ethtool -S enp2s0 | grep rx.*packets
         rx_packets: 20
         rx_queue_0_packets: 10
         rx_queue_1_packets: 0
         rx_queue_2_packets: 0
         rx_queue_3_packets: 10

Blanco Alcaine Hector (3):
  igc: Add documentation
  igc: Add default Rx queue configuration via sysfs
  igc: Add default Rx Queue into documentation

 .../device_drivers/ethernet/index.rst         |   1 +
 .../device_drivers/ethernet/intel/igc.rst     | 103 ++++++++++++
 drivers/net/ethernet/intel/igc/Makefile       |   3 +-
 drivers/net/ethernet/intel/igc/igc_main.c     |   6 +
 drivers/net/ethernet/intel/igc/igc_regs.h     |   6 +
 drivers/net/ethernet/intel/igc/igc_sysfs.c    | 156 ++++++++++++++++++
 drivers/net/ethernet/intel/igc/igc_sysfs.h    |  10 ++
 7 files changed, 284 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/networking/device_drivers/ethernet/intel/igc.rst
 create mode 100644 drivers/net/ethernet/intel/igc/igc_sysfs.c
 create mode 100644 drivers/net/ethernet/intel/igc/igc_sysfs.h

-- 
2.34.1