netdev - Re: [PATCH net] gianfar: Reject out-of-range RX NFC locations

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Date:	Mon, 19 Dec 2011 15:51:38 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Sebastian Pöhn <sebastian.poehn@...glemail.com>
CC:	David Miller <davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net] gianfar: Reject out-of-range RX NFC locations

On Sat, 2011-12-17 at 09:39 +0100, Sebastian Pöhn wrote:
> On Sat, 2011-12-17 at 01:05 +0000, Ben Hutchings wrote:
> > Currently the driver only uses location values to maintain an ordered
> > list of filters.  There is nothing to stop the list becoming longer
> > than the filer hardware can support - the driver will report an error,
> > but will not roll back the change!
> Sure that it does not do the rollback?
> In case of to much filters it should work this way:
> # Convert all in temp table
> # Compress temp table
> # Write out temp table => not enough space => discard temp table &
> remove filter from list 

You're right, I must have misread the code previously.  Therefore, I
withdraw this patch for the time being.

> > Make it reject location values >= MAX_FILER_IDX, consistent with the
> > range that gfar_get_cls_all() reports.

I do however think that this should be consistent, and I would like to
reserve some 'special' location values.  But, for compatibility, it may
be necessary to use some other method to distinguish them (e.g. another
flow_type flag.)

Ben.

> > Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
> Reviewed-by: Sebastian Pöhn <sebastian.poehn@...glemail.com>
> > ---
> > [Re-sent to what I hope is a current address for Sebastian.]
> > 
> > This has not been tested in any way, as I don't have a suitable compiler
> > installed.  Sebastian, please could you review this?
> Unfortunately I haven't too ...
> > 
> > Ben.
> > 
> >  drivers/net/ethernet/freescale/gianfar_ethtool.c |    5 +++--
> >  1 files changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
> > index 5890f4b..5a3b2e5 100644
> > --- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
> > +++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
> > @@ -1692,8 +1692,9 @@ static int gfar_set_nfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
> >  		ret = gfar_set_hash_opts(priv, cmd);
> >  		break;
> >  	case ETHTOOL_SRXCLSRLINS:
> > -		if (cmd->fs.ring_cookie != RX_CLS_FLOW_DISC &&
> > -			cmd->fs.ring_cookie >= priv->num_rx_queues) {
> > +		if ((cmd->fs.ring_cookie != RX_CLS_FLOW_DISC &&
> > +		     cmd->fs.ring_cookie >= priv->num_rx_queues) ||
> > +		    cmd->fs.location >= MAX_FILER_IDX) {
> >  			ret = -EINVAL;
> >  			break;
> >  		}
> > -- 
> > 1.7.4.4
> > 
> > 
> 
> 

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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