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

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Date:	Wed, 26 Nov 2014 10:44:19 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	hayeswang@...ltek.com, netdev@...r.kernel.org,
	nic_swsd@...ltek.com, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH net] r8152: drop the tx packet with invalid length

On Wed, 2014-11-26 at 12:06 -0500, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 26 Nov 2014 08:52:28 -0800
> 
> > On Wed, 2014-11-26 at 17:56 +0800, Hayes Wang wrote:
> >> Drop the tx packet which is more than the size of agg_buf_sz. When
> >> creating a bridge with the device, we may get the tx packet with
> >> TSO and the length is more than the gso_max_size which is set by
> >> the driver through netif_set_gso_max_size(). Such packets couldn't
> >> be transmitted and should be dropped directly.
> >> 
> >> Signed-off-by: Hayes Wang <hayeswang@...ltek.com>
>  ...
> > Looks like a candidate for ndo_gso_check(), so that we do not drop, but
> > instead segment from netif_needs_gso()/validate_xmit_skb()
> 
> You mean have the bridge implement the ndo_gso_check() method right?

No, I meant this particular driver.

Note that netif_skb_features() does only this check :

if (gso_segs > dev->gso_max_segs || gso_segs < dev->gso_min_segs)
      features &= ~NETIF_F_GSO_MASK;


Ie not testing gso_max_size

It looks like all these particular tests should be moved on
ndo_gso_check(), to remove code from netif_skb_features()



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