netdev - Re: [PATCH RFC 2/2] veth: propagate bridge GSO to peer

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Message-Id: <20171130.123822.578491882910143968.davem@davemloft.net>
Date:   Thu, 30 Nov 2017 12:38:22 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     stephen@...workplumber.org, solio.sarabia@...el.com,
        dsahern@...il.com, netdev@...r.kernel.org, sthemmin@...rosoft.com,
        shiny.sebastian@...el.com
Subject: Re: [PATCH RFC 2/2] veth: propagate bridge GSO to peer

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 30 Nov 2017 09:26:39 -0800

> On Thu, 2017-11-30 at 09:10 -0800, Stephen Hemminger wrote:
>> 
>> 
>> The problem goes back into the core GSO networking code.
>> Something like this is needed.
>> 
>> static inline bool netif_needs_gso(struct sk_buff *skb,
>> 				   const struct net_device *dev,
>> 				   netdev_features_t features)
>> {
>> 	return skb_is_gso(skb) &&
>> 		(!skb_gso_ok(skb, features) ||
>> 		 unlikely(skb_shinfo(skb)->gso_segs > dev-
>> >gso_max_segs) ||  << new
>> 		 unlikely(skb_shinfo(skb)->gso_size > dev-
>> >gso_max_size) ||  << new
>> 		 unlikely((skb->ip_summed != CHECKSUM_PARTIAL) &&
>> 			  (skb->ip_summed != CHECKSUM_UNNECESSARY)));
>> }
>> 
>> What that will do is split up the monster GSO packets if they ever
>> bleed
>> across from one device to another through the twisty mazes of packet
>> processing paths.
> 
> 
> Since very few drivers have these gso_max_segs / gso_max_size, check
> could be done in their ndo_features_check()

Agreed.