Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.9 10/13] r8169: fix NAPI handling under high load | Date | Tue, 30 Oct 2018 09:29:20 -0400 |
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From: Heiner Kallweit <hkallweit1@gmail.com>
[ Upstream commit 6b839b6cf9eada30b086effb51e5d6076bafc761 ]
rtl_rx() and rtl_tx() are called only if the respective bits are set in the interrupt status register. Under high load NAPI may not be able to process all data (work_done == budget) and it will schedule subsequent calls to the poll callback. rtl_ack_events() however resets the bits in the interrupt status register, therefore subsequent calls to rtl8169_poll() won't call rtl_rx() and rtl_tx() - chip interrupts are still disabled.
Fix this by calling rtl_rx() and rtl_tx() independent of the bits set in the interrupt status register. Both functions will detect if there's nothing to do for them.
Fixes: da78dbff2e05 ("r8169: remove work from irq handler.") Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/net/ethernet/realtek/r8169.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c index 20f5c0cabc89..24754d3fb0ac 100644 --- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -7559,17 +7559,15 @@ static int rtl8169_poll(struct napi_struct *napi, int budget) struct rtl8169_private *tp = container_of(napi, struct rtl8169_private, napi); struct net_device *dev = tp->dev; u16 enable_mask = RTL_EVENT_NAPI | tp->event_slow; - int work_done= 0; + int work_done; u16 status; status = rtl_get_events(tp); rtl_ack_events(tp, status & ~tp->event_slow); - if (status & RTL_EVENT_NAPI_RX) - work_done = rtl_rx(dev, tp, (u32) budget); + work_done = rtl_rx(dev, tp, (u32) budget); - if (status & RTL_EVENT_NAPI_TX) - rtl_tx(dev, tp); + rtl_tx(dev, tp); if (status & tp->event_slow) { enable_mask &= ~tp->event_slow; -- 2.17.1
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