[PATCH v8 6/6] r8169: Disable ASPM while doing NAPI poll
From: Kai-Heng Feng <hidden>
Date: 2023-02-21 02:34:42
Also in:
lkml
Subsystem:
8169 10/100/1000 gigabit ethernet driver, networking drivers, the rest · Maintainers:
Heiner Kallweit, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
NAPI poll of Realtek NICs don't seem to perform well ASPM is enabled.
The vendor driver uses a mechanism called "dynamic ASPM" to toggle ASPM
based on the packet number in given time period.
Instead of implementing "dynamic ASPM", use a more straightforward way
by disabling ASPM during NAPI poll, as a similar approach was
implemented to solve slow performance on Realtek wireless NIC, see
commit 24f5e38a13b5 ("rtw88: Disable PCIe ASPM while doing NAPI poll on
8821CE").
Since NAPI poll should be handled as fast as possible, also remove the
delay in rtl_hw_aspm_clkreq_enable() which was added by commit
94235460f9ea ("r8169: Align ASPM/CLKREQ setting function with vendor
driver").
Signed-off-by: Kai-Heng Feng <redacted>
---
v8:
- New patch.
drivers/net/ethernet/realtek/r8169_main.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 897f90b48bba6..4d4a802346ae3 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c@@ -2711,8 +2711,6 @@ static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable) RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~ClkReqEn); RTL_W8(tp, Config5, RTL_R8(tp, Config5) & ~ASPM_en); } - - udelay(10); } static void rtl_set_fifo_size(struct rtl8169_private *tp, u16 rx_stat,
@@ -4577,6 +4575,12 @@ static int rtl8169_poll(struct napi_struct *napi, int budget) struct net_device *dev = tp->dev; int work_done; + if (tp->aspm_manageable) { + rtl_unlock_config_regs(tp); + rtl_hw_aspm_clkreq_enable(tp, false); + rtl_lock_config_regs(tp); + } + rtl_tx(dev, tp, budget); work_done = rtl_rx(dev, tp, budget);
@@ -4584,6 +4588,12 @@ static int rtl8169_poll(struct napi_struct *napi, int budget) if (work_done < budget && napi_complete_done(napi, work_done)) rtl_irq_enable(tp); + if (tp->aspm_manageable) { + rtl_unlock_config_regs(tp); + rtl_hw_aspm_clkreq_enable(tp, true); + rtl_lock_config_regs(tp); + } + return work_done; }
--
2.34.1