netdev - Re: [PATCH net] net: gso: fix panic on frag

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Date:   Mon, 31 Oct 2022 16:54:48 +0100
From:   Jiri Benc <jbenc@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Shmulik Ladkani <shmulik@...anetworks.com>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Tomas Hruby <tomas@...era.io>,
        Jeremi Piotrowski <jpiotrowski@...ux.microsoft.com>,
        alexanderduyck@...a.com, willemb@...gle.com,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net] net: gso: fix panic on frag_list with mixed head
 alloc types

On Fri, 28 Oct 2022 21:41:23 -0700, Jakub Kicinski wrote:
> On Thu, 27 Oct 2022 10:20:56 +0200 Jiri Benc wrote:
> > It turns out this assumption does not hold. We've seen BUG_ON being hit
> > in skb_segment when skbs on the frag_list had differing head_frag. That
> > particular case was with vmxnet3; looking at the driver, it indeed uses
> > different skb allocation strategies based on the packet size.  
> 
> Where are you looking? I'm not seeing it TBH.

Looking at the code again, I think I misread it.

> I don't think the driver is that important, tho, __napi_alloc_skb() 
> will select page backing or kmalloc, all by itself.

In this case, it was __netdev_alloc_skb. I'll fix the description.

Thanks!

 Jiri