From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Heiner Kallweit <hkallweit1@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.9 10/13] r8169: fix NAPI handling under high load
Date: Tue, 30 Oct 2018 09:29:20 -0400 [thread overview]
Message-ID: <20181030132923.218124-10-sashal@kernel.org> (raw)
In-Reply-To: <20181030132923.218124-1-sashal@kernel.org>
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
next prev parent reply other threads:[~2018-10-30 13:30 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-30 13:29 [PATCH AUTOSEL 4.9 01/13] bpf: do not blindly change rlimit in reuseport net selftest Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 02/13] Revert "perf tools: Fix PMU term format max value calculation" Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 03/13] xfrm: policy: use hlist rcu variants on insert Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 04/13] sparc: Fix single-pcr perf event counter management Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 05/13] sparc64: Make proc_id signed Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 06/13] sched/fair: Fix the min_vruntime update logic in dequeue_entity() Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 07/13] perf cpu_map: Align cpu map synthesized events properly Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 08/13] x86/fpu: Remove second definition of fpu in __fpu__restore_sig() Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 09/13] net: qla3xxx: Remove overflowing shift statement Sasha Levin
2018-10-30 13:29 ` Sasha Levin [this message]
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 11/13] selftests: ftrace: Add synthetic event syntax testcase Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 12/13] net: fix pskb_trim_rcsum_slow() with odd trim offset Sasha Levin
2018-10-30 13:29 ` [PATCH AUTOSEL 4.9 13/13] i2c: rcar: cleanup DMA for all kinds of failure Sasha Levin
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