Re: [PATCH net, 1/3] net: mana: Fix TX CQE error handling

[Simon Horman]

On Fri, Sep 29, 2023 at 03:51:48PM +0000, Haiyang Zhang wrote:
> 
> 
> > -----Original Message-----
> > From: Simon Horman <horms@xxxxxxxxxx>
> > Sent: Friday, September 29, 2023 1:51 AM
> > To: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> > Cc: linux-hyperv@xxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; Dexuan Cui
> > <decui@xxxxxxxxxxxxx>; KY Srinivasan <kys@xxxxxxxxxxxxx>; Paul Rosswurm
> > <paulros@xxxxxxxxxxxxx>; olaf@xxxxxxxxx; vkuznets
> > <vkuznets@xxxxxxxxxx>; davem@xxxxxxxxxxxxx; wei.liu@xxxxxxxxxx;
> > edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx; pabeni@xxxxxxxxxx;
> > leon@xxxxxxxxxx; Long Li <longli@xxxxxxxxxxxxx>;
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> > ast@xxxxxxxxxx; Ajay Sharma <sharmaajay@xxxxxxxxxxxxx>;
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> > linux-kernel@xxxxxxxxxxxxxxx; stable@xxxxxxxxxxxxxxx
> > Subject: Re: [PATCH net, 1/3] net: mana: Fix TX CQE error handling
> > 
> > On Fri, Sep 29, 2023 at 07:47:57AM +0200, Simon Horman wrote:
> > > On Sat, Sep 23, 2023 at 06:31:45PM -0700, Haiyang Zhang wrote:
> > > > For an unknown TX CQE error type (probably from a newer hardware),
> > > > still free the SKB, update the queue tail, etc., otherwise the
> > > > accounting will be wrong.
> > > >
> > > > Also, TX errors can be triggered by injecting corrupted packets, so
> > > > replace the WARN_ONCE to ratelimited error logging, because we don't
> > > > need stack trace here.
> > > >
> > > > Cc: stable@xxxxxxxxxxxxxxx
> > > > Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure
> > Network Adapter (MANA)")
> > > > Signed-off-by: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> > >
> > > Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
> > 
> > Sorry, one latent question.
> > 
> > The patch replaces WARN_ONCE with a net_ratelimit()'d netdev_err().
> > But I do wonder if, as a fix, netdev_err_once() would be more appropriate.
> 
> This error may happen with different CQE error types, so I use netdev_err() 
> to display them, and added rate limit.

Thanks for the clarification.