netdev - Re: [PATCH] [PATCH net] tg3: power down device only on SYSTEM_POWER

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Message-ID: <CALs4sv3pGsNFQeZstmioiTxjhMu6HJm9_ES1u4_sbTZKrztrDQ@mail.gmail.com>
Date: Thu, 2 Nov 2023 22:41:07 +0530
From: Pavan Chebbi <pavan.chebbi@...adcom.com>
To: George Shuklin <george.shuklin@...il.com>
Cc: netdev@...r.kernel.org, Andrew Gospodarek <andrew.gospodarek@...adcom.com>, 
	Michael Chan <michael.chan@...adcom.com>
Subject: Re: [PATCH] [PATCH net] tg3: power down device only on SYSTEM_POWER_OFF

On Thu, Nov 2, 2023 at 7:44 PM George Shuklin <george.shuklin@...il.com> wrote:
>
> On 11/2/23 09:04, Pavan Chebbi wrote:
> > On Thu, Nov 2, 2023 at 1:28 AM George Shuklin <george.shuklin@...il.com> wrote:
> >> On 01/11/2023 17:20, Pavan Chebbi wrote:
> >>> On Wed, Nov 1, 2023 at 6:34 PM George Shuklin <george.shuklin@...il.com> wrote:
> >>>> Dell R650xs servers hangs if tg3 driver calls tg3_power_down.
> >>>>
> >>>> This happens only if network adapters (BCM5720 for R650xs) were
> >>>> initialized using SNP (e.g. by booting ipxe.efi).
> >>>>
> >>>> This is partial revert of commit 2ca1c94ce0b.
> >>>>
> >>>> The actual problem is on Dell side, but this fix allow servers
> >>>> to come back alive after reboot.
> >>> How are you sure that the problem solved by 2ca1c94ce0b is not
> >>> reintroduced with this change?
> >> I contacted the author of original patch, no reply yet (1st day). Also,
> >> I tested it on few generations of available Dell servers (R330, R340,
> >> R350 and R650sx, for which this fix should help). It does produce log
> >> message from
> >> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1917471, but, at
> >> least, it reboots without issues.
> >>
> >> Actually, original patch is regression: 5.19 rebooting just fine, 6.0
> >> start to hang. I also reported it to dell support forum, but I'm not
> >> sure if they pick it up or not.
> >>
> >> What would be the proper course of actions for such problem (outside of
> >> fixing UEFI SNP, for which I don't have access to sources)?
> >>
> > Thanks for the explanation. I am not sure if we should make this
> > change unless we are 100pc sure that this patch won't cause
> > regression.
> > I feel Dell is in the best position to debug this and they can even
> > contact Broadcom if they see any problem in UEFI.
>
> I'm right now with dell support, and what they asked is to 'try this on
> supported distros', which at newest are 5.15. I'll try to bypass their
> L1 with Ubuntu + HWE to get to 6+ versions...
>
> I was able to reproduce hanging at reboot there (without ACPI messages),
> and patching helps there too.
>
OK. I am not too sure what we should do. The change as such looks fine to me.
Of course, the patch needs proper tags (tree.fixes, cc ...)

@Michael : Do you have any suggestions on this?

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