netdev - Re: RFC - should network devices trim frames

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Message-ID: <1314829651.9556.37.camel@HP1>
Date:	Wed, 31 Aug 2011 15:27:31 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"Stephen Hemminger" <shemminger@...tta.com>
cc:	"David Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: RFC - should network devices trim frames > soft mtu


On Wed, 2011-08-31 at 15:18 -0700, Stephen Hemminger wrote:
> I noticed the following in the bnx2 driver.
> 
> 
> static int
> bnx2_rx_int(struct bnx2 *bp, struct bnx2_napi *bnapi, int budget)
> {
> ...
> 		skb->protocol = eth_type_trans(skb, bp->dev);
> 
> 		if ((len > (bp->dev->mtu + ETH_HLEN)) &&
> 			(ntohs(skb->protocol) != 0x8100)) {
> 
> 			dev_kfree_skb(skb);
> 			goto next_rx;
> 
> 		}
> 
> This means that for non-VLAN tagged frames, the device drops received
> packets if the length is greater than the MTU.  I don't see that in
> other devices. What is the correct method? IMHO the bnx2 driver is
> wrong here and if the policy is desired it should be enforced at
> the next level (netif_receive_skb).  Hardcoding a protocol value is
> kind of a giveaway that something is fishy.
> 

I guess the reasoning is that we program the RX MTU in our chip to
automatically discard packets bigger than the RX MTU and count them as
over-size packets.  We add 4 bytes to the RX MTU to account for the VLAN
tag which may be stripped or not stripped by the chip depending on
settings.  The extra 4 bytes in the RX MTU setting will allow over-size
packets by up to 4 bytes to get through.

I agree we should move this to the next level.


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