netdev - Re: [PATCH net] r8169: avoid unsolicited interrupts

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Message-ID: <e34dad2c-7920-4024-9497-f4f9aea4a93f@gmail.com>
Date: Thu, 17 Oct 2024 23:22:20 +0200
From: Heiner Kallweit <hkallweit1@...il.com>
To: Realtek linux nic maintainers <nic_swsd@...ltek.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 David Miller <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: Pengyu Ma <mapengyu@...il.com>,
 "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] r8169: avoid unsolicited interrupts

On 17.10.2024 08:05, Heiner Kallweit wrote:
> It was reported that after resume from suspend a PCI error is logged
> and connectivity is broken. Error message is:
> PCI error (cmd = 0x0407, status_errs = 0x0000)
> The message seems to be a red herring as none of the error bits is set,
> and the PCI command register value also is normal. Exception handling
> for a PCI error includes a chip reset what apparently brakes connectivity
> here. The interrupt status bit triggering the PCI error handling isn't
> actually used on PCIe chip versions, so it's not clear why this bit is
> set by the chip.
> Fix this by ignoring interrupt status bits which aren't part of the
> interrupt mask.
> Note that RxFIFOOver needs a special handling on certain chip versions,
> it's handling isn't changed with this patch.
> 
> Fixes: 0e4851502f84 ("r8169: merge with version 8.001.00 of Realtek's r8168 driver")
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219388
> Tested-by: Pengyu Ma <mapengyu@...il.com>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---

When doing some unrelated performance tests I found that this patch breaks
connectivity under heavy load. Please drop it.
I'll investigate and come up with an alternative way to fix the reported issue.