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From: Stefan Fleischmann <sfle@kth.se>
To: "Eric Dumazet" <edumazet@kernel.org>,
	"Fabian Grünbichler" <f.gruenbichler@proxmox.com>
Cc: Michael Chan <michael.chan@broadcom.com>,
	Joe Damato <joe@dama.to>,
	netdev@vger.kernel.org, Pavan Chebbi <pavan.chebbi@broadcom.com>,
	regressions@lists.linux.dev, stable@vger.kernel.org
Subject: Re: [REGRESSION] Commit 447cbe95ebb9 causes IOMMU DMA faults on macvlan/vlan with bnxt_en
Date: Mon, 5 Oct 2026 14:54:30 +0200	[thread overview]
Message-ID: <20261005145430.12777c2c@nargothrond> (raw)
In-Reply-To: <CAL4WiioggQU3VtWSL9nrExg5SZZbKiPA8pWmzeH+uRa0gy2ApA@mail.gmail.com>

On Mon, 5 Oct 2026 12:14:00 +0200
Eric Dumazet <edumazet@kernel.org> wrote:

> Le lun. 5 oct. 2026 à 11:44, Fabian Grünbichler
> <f.gruenbichler@proxmox.com> a écrit :
> >
> > On October 5, 2026 3:59 am, Eric Dumazet wrote:  
> > >
> > >
> > > On 10/5/26 00:29, Michael Chan wrote:  
> > >>
> > >> I think skb->len is not updated with the padded length here.  So
> > >> the HW will drop the packet seeing that the length is too short.
> > >>  There is another skb_put_padto() that might work better?  
> > >
> > > +1 Exactly, thanks!  
> >
> > FWIW, we suspect we have quite a few users running into this since
> > importing upstream changes from 7.2.2-7.2.5.
> >
> > Will report back once we've provided those users with a kernel with
> > the below diff.  
> 
> Patch has been sent for review:
> 
> https://lore.kernel.org/netdev/20261005023812.130639-1-edumazet@kernel.org/

I'm testing the patch on v6.18.55, and it looks good so far. 5 hours and
counting without any issues.

Best,
Stefan

  reply	other threads:[~2026-10-05 13:03 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-04 10:26 [REGRESSION] Commit 447cbe95ebb9 causes IOMMU DMA faults on macvlan/vlan with bnxt_en Stefan Fleischmann
2026-10-04 11:46 ` Eric Dumazet
2026-10-04 14:35   ` Stefan Fleischmann
2026-10-04 17:29     ` Stefan Fleischmann
2026-10-04 20:52       ` Eric Dumazet
2026-10-04 21:11         ` Eric Dumazet
2026-10-04 22:29           ` Michael Chan
2026-10-05  1:59             ` Eric Dumazet
2026-10-05  9:44               ` Fabian Grünbichler
2026-10-05 10:14                 ` Eric Dumazet
2026-10-05 12:54                   ` Stefan Fleischmann [this message]
2026-10-06 21:35                     ` Sasha Levin
2026-10-07 10:33                       ` Thorsten Leemhuis
2026-10-07 11:08                         ` Eric Dumazet
2026-10-05 17:38   ` Joe Damato

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