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Message-ID: <ad948b42-74d3-b4f1-bbd6-449f71703083@leemhuis.info>
Date:   Mon, 22 May 2023 15:00:30 +0200
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Subject: Re: MT7922 problem with "fix rx filter incorrect by drv/fw
 inconsistent"
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To:     Andrey Rakhmatullin <wrar@wrar.name>,
        linux-wireless@vger.kernel.org, Neil Chen <yn.chen@mediatek.com>,
        Deren Wu <deren.wu@mediatek.com>
Cc:     Lorenzo Bianconi <lorenzo@kernel.org>,
        Felix Fietkau <nbd@nbd.name>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Linux kernel regressions list <regressions@lists.linux.dev>
References: <ZGY4peApQnPAmDkY@durkon.wrar.name>
From:   "Linux regression tracking #adding (Thorsten Leemhuis)" 
        <regressions@leemhuis.info>
Reply-To: Linux regressions mailing list <regressions@lists.linux.dev>
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[CCing the regression list, as it should be in the loop for regressions:
https://docs.kernel.org/admin-guide/reporting-regressions.html]

[TLDR: I'm adding this report to the list of tracked Linux kernel
regressions; the text you find below is based on a few templates
paragraphs you might have encountered already in similar form.
See link in footer if these mails annoy you.]

On 18.05.23 16:39, Andrey Rakhmatullin wrote:
> Hello. I have a "MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless
> Network Adapter" (14c3:0616) and when the commit c222f77fd4 ("wifi: mt76:
> mt7921: fix rx filter incorrect by drv/fw inconsistent") is applied (found
> by bisecting, checked by reverting it on v6.3) I have the following
> problem on my machine: when I connect to my router no DHCPv4 exchange
> happens, I don't see responses in tcpdump. My network setup is non-trivial
> though, and it looks like the problem is specific to it, but I still
> wonder if it's some bug in the aforementioned patch as my setup works with
> all other devices and I would expect it to work as long as the network
> packets sent by the device are the same.
> 
> My setup is as follows: I have an ISP router which provides a 2.4GHz
> network and another router (Xiaomi R4AC with OpenWRT) connected by
> Ethernet to it that provides a 5GHz network and is configured as a "Relay
> bridge" (using relayd) to forward packets to the ISP router and back. This
> includes DHCPv4 packets, which are handled by the ISP router. tcpdump on
> the machine with MT7922 shows that the DHCP requests are sent while the
> responses are not received, while tcpdump on the bridge router shows both
> requests and responses.
> 
> I've tried connecting the machine to the ISP router network directly and
> also to another AP (one on my phone) and those work correctly on all
> kernels.
> 
> Please let me know if I need to do any other debugging or troubleshooting
> steps. Thank you.

Thanks for the report. To be sure the issue doesn't fall through the
cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression
tracking bot:

#regzbot ^introduced c222f77fd
#regzbot title wifi: mt76: mt7921: DHCPv4 exchange broke
#regzbot ignore-activity

This isn't a regression? This issue or a fix for it are already
discussed somewhere else? It was fixed already? You want to clarify when
the regression started to happen? Or point out I got the title or
something else totally wrong? Then just reply and tell me -- ideally
while also telling regzbot about it, as explained by the page listed in
the footer of this mail.

Developers: When fixing the issue, remember to add 'Link:' tags pointing
to the report (the parent of this mail). See page linked in footer for
details.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
That page also explains what to do if mails like this annoy you.