[PATCH v8 RESEND 0/6] r8169: Enable ASPM for recent 1.0/2.5Gbps Realtek NICs

[Kai-Heng Feng]

The series is to enable ASPM on more r8169 supported devices, if
available.

The latest Realtek vendor driver and its Windows driver implements a
feature called "dynamic ASPM" which can improve performance on it's
ethernet NICs.

We have "dynamic ASPM" mechanism in Ubuntu 22.04 LTS kernel for quite a
while, and AFAIK it hasn't introduced any regression so far. 

A very similar issue was observed on Realtek wireless NIC, and it was
resolved by disabling ASPM during NAPI poll. So in v8, we use the same
approach, which is more straightforward, instead of toggling ASPM based
on packet count.

v7:
https://lore.kernel.org/netdev/20211016075442.650311-1-kai.heng.feng@xxxxxxxxxxxxx/

v6:
https://lore.kernel.org/netdev/20211007161552.272771-1-kai.heng.feng@xxxxxxxxxxxxx/

v5:
https://lore.kernel.org/netdev/20210916154417.664323-1-kai.heng.feng@xxxxxxxxxxxxx/

v4:
https://lore.kernel.org/netdev/20210827171452.217123-1-kai.heng.feng@xxxxxxxxxxxxx/

v3:
https://lore.kernel.org/netdev/20210819054542.608745-1-kai.heng.feng@xxxxxxxxxxxxx/

v2:
https://lore.kernel.org/netdev/20210812155341.817031-1-kai.heng.feng@xxxxxxxxxxxxx/

v1:
https://lore.kernel.org/netdev/20210803152823.515849-1-kai.heng.feng@xxxxxxxxxxxxx/

Kai-Heng Feng (6):
  r8169: Disable ASPM L1.1 on 8168h
  Revert "PCI/ASPM: Unexport pcie_aspm_support_enabled()"
  PCI/ASPM: Add pcie_aspm_capable() helper
  r8169: Consider chip-specific ASPM can be enabled on more cases
  r8169: Use mutex to guard config register locking
  r8169: Disable ASPM while doing NAPI poll

 drivers/net/ethernet/realtek/r8169_main.c | 48 ++++++++++++++++++-----
 drivers/pci/pcie/aspm.c                   | 12 ++++++
 include/linux/pci.h                       |  2 +
 3 files changed, 53 insertions(+), 9 deletions(-)

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2.34.1