netdev - Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179

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Date:	Mon, 22 Jul 2013 18:11:15 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	<freddy@...x.com.tw>, <davem@...emloft.net>,
	<netdev@...r.kernel.org>, <grundler@...gle.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<louis@...x.com.tw>, <allan@...x.com.tw>
Subject: Re: [PATCH 1/1] TX throttling bug-fixing patch of AX88179_178A

On Mon, 2013-07-22 at 10:07 -0700, Eric Dumazet wrote:
> On Sat, 2013-07-20 at 17:16 +0800, freddy@...x.com.tw wrote:
> > From: Freddy Xin <freddy@...x.com.tw>
> > 
> > Disable TSO and SG network features in reset() and bind() functions,
> > and check the return value of skb_linearize() in tx_fixup() to prevent
> > TX throttling.
> > 
> > Signed-off-by: Freddy Xin <freddy@...x.com.tw>
> > ---
> >  drivers/net/usb/ax88179_178a.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
> > index 1e3c302..eb71331 100644
> > --- a/drivers/net/usb/ax88179_178a.c
> > +++ b/drivers/net/usb/ax88179_178a.c
> > @@ -1029,7 +1029,7 @@ static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf)
> >  	dev->mii.supports_gmii = 1;
> >  
> >  	dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
> > -			      NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;
> > +			      NETIF_F_RXCSUM;
> >  
> >  	dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
> >  				 NETIF_F_RXCSUM | NETIF_F_SG | NETIF_F_TSO;
> > @@ -1173,7 +1173,9 @@ ax88179_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
> >  	if (((skb->len + 8) % frame_size) == 0)
> >  		tx_hdr2 |= 0x80008000;	/* Enable padding */
> >  
> > -	skb_linearize(skb);
> > +	if (skb_linearize(skb))
> > +		return NULL;
> > +
> >  	
> 
> I guess that if a driver does not advertise NETIF_F_SG, this
> skb_linearize() call is not needed : All frames reaching your xmit
> function should already be linear

Look at the hw_features initialisation...

Ben.

-- 
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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