[PATCH net-next v11 0/7] r8169: add RSS support for RTL8127

From: Javen Xu <[email protected]>

This patch series adds RSS (Receive Side Scaling) support for the r8169
ethernet driver, specifically for RTL8127 (RTL_GIGA_MAC_VER_80).

RSS enables packet distribution across multiple receive queues, which can
significantly improve network throughput on multi-core systems by allowing
parallel processing of incoming packets.

Key features:
- Multi-queue RX support (up to 8 queues)
- MSI-X interrupt with vector mapping
- Dynamic queue configuration via ethtool (-L)
- RSS hash computation for flow classification

Experiments:
Platform: AMD Ryzen Embedded R2514 with Radeon Graphics(4 Cores/8 Threads)
Arch: x86_64
Test command: 
  Server: iperf3 -s
  Client: iperf3 -c 192.168.2.1 -P 20 -t 3600
Monitor: mpstat -P ALL 1

Before this patch (Without RSS):
  Throughput: Unstable, fluctuating between 3.76 Gbits/sec and
  8.2 Gbits/sec.
  CPU Usage: A single CPU core is fully occupied with softirq reaching 
  up to 96%.

After this patch (With RSS enabled):
  Throughput: Stable at 9.42 Gbits/sec.
  CPU Usage: The traffic load is evenly distributed across multiple CPU
  cores. The maximum softirq on a single core dropped to 63%.
  
Other Experiments:
Link: https://lore.kernel.org/netdev/[email protected]/

Javen Xu (7):
  r8169: add support for multi irqs
  r8169: refactor RX path to prepare for multi-queue
  r8169: add support for new interrupt mapping
  r8169: enable new interrupt mapping
  r8169: add support and enable rss
  r8169: move struct ethtool_ops
  r8169: add get_channel support for ethtool

 drivers/net/ethernet/realtek/r8169_main.c | 1076 ++++++++++++++++++---
 1 file changed, 929 insertions(+), 147 deletions(-)

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2.43.0