netdev - Re: [PATCH v2 4/4] net: ethoc: implement ethtool operations

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Date:	Thu, 30 Jan 2014 14:04:53 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Max Filippov <jcmvbkbc@...il.com>
Cc:	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Zankel <chris@...kel.net>,
	Marc Gauthier <marc@...ence.com>,
	"David S. Miller" <davem@...emloft.net>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH v2 4/4] net: ethoc: implement ethtool operations

On Thu, 2014-01-30 at 07:04 +0400, Max Filippov wrote:
> On Thu, Jan 30, 2014 at 5:59 AM, Ben Hutchings <ben@...adent.org.uk> wrote:
> > On Wed, 2014-01-29 at 10:00 +0400, Max Filippov wrote:
[...]
> >> +     priv->num_tx = rounddown_pow_of_two(ring->tx_pending);
> >
> > Range check?
> 
> May there be requested more than ring->tx_max_pending that we
> indicated in the get_ringparam?

Yes, the ethtool core doesn't check that for you.

> >> +     priv->num_rx = priv->num_bd - priv->num_tx;
> >> +     if (priv->num_rx > ring->rx_pending)
> >> +             priv->num_rx = ring->rx_pending;
> >
> > So the RX ring may only ever be shrunk?!  Did you mean to compare with
> > priv->num_bd instead?
> 
> First all non-TX descriptors are made RX, and if that's more than user
> requested I trim it.
[...]

OK, I get it.  But it would be clearer if you used min().

Ben.

-- 
Ben Hutchings
It is a miracle that curiosity survives formal education. - Albert Einstein

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