netdev - Re: [PATCH net] r8152: drop the tx packet with invalid length

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Date:	Fri, 19 Dec 2014 09:36:43 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hayes Wang <hayeswang@...ltek.com>,
	Tom Herbert <therbert@...gle.com>
Cc:	David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	nic_swsd <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH net] r8152: drop the tx packet with invalid length

On Fri, 2014-12-19 at 06:42 +0000, Hayes Wang wrote:

> Excuse me. I try to implement ndo_gso_check() with kernel 3.18.
> However, I still get packets with gso and their skb lengths are more
> than the acceptable one. Do I miss something?
> 
> +static bool rtl8152_gso_check(struct sk_buff *skb, struct net_device *dev)
> +{
> +	if ((skb->len + sizeof(struct tx_desc)) > agg_buf_sz)
> +		return false;
> +
> +	return true;
> +}
>  
> @@ -5861,6 +5876,9 @@ static const struct net_device_ops rtl8152_netdev_ops = {
>  	.ndo_set_mac_address	= rtl8152_set_mac_address,
>  	.ndo_change_mtu		= rtl8152_change_mtu,
>  	.ndo_validate_addr	= eth_validate_addr,
> +	.ndo_gso_check		= rtl8152_gso_check,
>  };

You are right, it seems ndo_gso_check() is buggy at this moment.

Presumably this method should alter %features so that we really segment
the packets in software.

features &= ~NETIF_F_GSO_MASK;



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