netdev - Re: [PATCH] igb: cope with large MAX_SKB

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Date: Tue, 23 Apr 2024 15:54:05 +0200
From: Corinna Vinschen <vinschen@...hat.com>
To: Jiri Pirko <jiri@...nulli.us>
Cc: netdev@...r.kernel.org, intel-wired-lan@...ts.osuosl.org
Subject: Re: [PATCH] igb: cope with large MAX_SKB_FRAGS.

Hi Jiri,

On Apr 23 13:26, Jiri Pirko wrote:
> Tue, Apr 23, 2024 at 12:24:46PM CEST, vinschen@...hat.com wrote:
> >From: Paolo Abeni <pabeni@...hat.com>
> >
> >Sabrina reports that the igb driver does not cope well with large
> >MAX_SKB_FRAG values: setting MAX_SKB_FRAG to 45 causes payload
> >corruption on TX.
> >
> >The root cause of the issue is that the driver does not take into
> >account properly the (possibly large) shared info size when selecting
> >the ring layout, and will try to fit two packets inside the same 4K
> >page even when the 1st fraglist will trump over the 2nd head.
> >
> >Address the issue forcing the driver to fit a single packet per page,
> >leaving there enough room to store the (currently) largest possible
> >skb_shared_info.
> >
> >Fixes: 3948b05950fd ("net: introduce a config option to tweak MAX_SKB_FRAG")
> >Reported-by: Jan Tluka <jtluka@...hat.com>
> >Reported-by: Jirka Hladky <jhladky@...hat.com>
> >Reported-by: Sabrina Dubroca <sd@...asysnail.net>
> >Tested-by: Sabrina Dubroca <sd@...asysnail.net>
> >Tested-by: Corinna Vinschen <vinschen@...hat.com>
> >Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> >---
> > drivers/net/ethernet/intel/igb/igb_main.c | 1 +
> 
> Also, please use get_maintainer.pl script to get cclist.

done and done in v2 (for which I forgot the "in-reply-to" now, d'uh)

Thanks,
Corinna