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

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Date:	Mon, 22 Jul 2013 10:07:59 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	freddy@...x.com.tw
Cc:	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 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

Thanks


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