netdev - Re: [PATCH net-next] sfc: handle VI shortage on ef100 by readjusting the channels

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Message-ID: <ZG4eVZgdhy6oo8P7@corigine.com>
Date: Wed, 24 May 2023 16:25:25 +0200
From: Simon Horman <simon.horman@...igine.com>
To: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
Cc: netdev@...r.kernel.org, linux-net-drivers@....com, davem@...emloft.net,
	kuba@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
	ecree.xilinx@...il.com, habetsm.xilinx@...il.com
Subject: Re: [PATCH net-next] sfc: handle VI shortage on ef100 by readjusting
 the channels

On Wed, May 24, 2023 at 02:52:48PM +0100, Pieter Jansen van Vuuren wrote:
> 
> 
> On 24/05/2023 11:09, Simon Horman wrote:
> > On Wed, May 24, 2023 at 10:36:38AM +0100, Pieter Jansen van Vuuren wrote:
> >> When fewer VIs are allocated than what is allowed we can readjust
> >> the channels by calling efx_mcdi_alloc_vis() again.
> >>
> >> Signed-off-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
> >> Reviewed-by: Martin Habets <habetsm.xilinx@...il.com>
> > 
> > Hi Pieter,
> > 
> > this patch looks good to me.
> > 
> > Reviewed-by: Simon Horman <simon.horman@...igine.com>
> > 
> > But during the review I noticed that Smatch flags some
> > problems in ef100_netdev.c that you may wish to address.
> > Please see below.
> > 
> >> ---
> >>  drivers/net/ethernet/sfc/ef100_netdev.c | 51 ++++++++++++++++++++++---
> >>  1 file changed, 45 insertions(+), 6 deletions(-)
> >>
> >> diff --git a/drivers/net/ethernet/sfc/ef100_netdev.c b/drivers/net/ethernet/sfc/ef100_netdev.c
> >> index d916877b5a9a..c201e001f3b8 100644
> >> --- a/drivers/net/ethernet/sfc/ef100_netdev.c
> >> +++ b/drivers/net/ethernet/sfc/ef100_netdev.c
> > 
> ...
> >> +		/* It should be very unlikely that we failed here again, but in
> >> +		 * such a case we return ENOSPC.
> >> +		 */
> >> +		if (rc == -EAGAIN) {
> >> +			rc = -ENOSPC;
> >> +			goto fail;
> >> +		}
> >> +	}
> >> +
> >>  	rc = efx_probe_channels(efx);
> >>  	if (rc)
> >>  		return rc;
> > 
> > Not strictly related to this patch, but Smatch says that on error this should
> > probably free some resources. So perhaps:
> > 
> > 		goto fail;
> > 
> > Also not strictly related this patch, but Smatch also noticed that
> > in ef100_probe_netdev net_dev does not seem to be freed on the error path.
> 
> Thank you for the review Simon. Yes, I think this requires some attention, I think
> this is one of a few that we need to look at. So it will likely become a separate
> patch set addressing Smatch issues.

Thanks Pieter,

I agree that these are separate issues and can
be handled outside the scope of this patch.