netdev - Re: mlx5 driver is broken when pci_msix_can_alloc

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Date: Wed, 31 May 2023 15:43:15 +0200
From: Niklas Schnelle <schnelle@...ux.ibm.com>
To: Linux regressions mailing list <regressions@...ts.linux.dev>,
        Shay Drory
	 <shayd@...dia.com>, Saeed Mahameed <saeedm@...dia.com>,
        Eli Cohen
	 <elic@...dia.com>, netdev@...r.kernel.org
Subject: Re: mlx5 driver is broken when pci_msix_can_alloc_dyn() is false
 with v6.4-rc4

On Wed, 2023-05-31 at 15:33 +0200, Linux regression tracking #adding
(Thorsten Leemhuis) wrote:
> [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 30.05.23 15:04, Niklas Schnelle wrote:
> > 
> > With v6.4-rc4 I'm getting a stream of RX and TX timeouts when trying to
> > use ConnectX-4 and ConnectX-6 VFs on s390. I've bisected this and found
> > the following commit to be broken:
> > 
> > commit 1da438c0ae02396dc5018b63237492cb5908608d
> > Author: Shay Drory <shayd@...dia.com>
> > Date:   Mon Apr 17 10:57:50 2023 +0300
> > [...]
> 
> 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 1da438c0ae02396dc5018b63237492cb5908608d
> #regzbot title net/mlx5: RX and TX timeouts with ConnectX-4 and
> ConnectX-6 VFs on s390
> #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.

Hi Thorsten,

Thanks for tracking. I actually already sent a fix patch (and v2) for
this. Sadly I forgot to link to this mail. Let's see if I can get the
regzbot command right to update it. As for the humans the latest fix
patch is here:

https://lore.kernel.org/netdev/20230531084856.2091666-1-schnelle@linux.ibm.com/

Thanks,
Niklas

#regzbot fix: net/mlx5: Fix setting of irq->map.index for static IRQ case