linux-kernel - Re: [PATCH net v2 1/3] net: gro: add {inner_}network_offset to napi_gro

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Date: Fri, 19 Apr 2024 14:51:45 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: Richard Gobert <richardbgobert@...il.com>, 
 davem@...emloft.net, 
 edumazet@...gle.com, 
 kuba@...nel.org, 
 pabeni@...hat.com, 
 dsahern@...nel.org, 
 willemdebruijn.kernel@...il.com, 
 alexander.duyck@...il.com, 
 aleksander.lobakin@...el.com, 
 netdev@...r.kernel.org, 
 linux-kernel@...r.kernel.org
Cc: Richard Gobert <richardbgobert@...il.com>
Subject: Re: [PATCH net v2 1/3] net: gro: add {inner_}network_offset to
 napi_gro_cb

Richard Gobert wrote:
> This patch adds network_offset and inner_network_offset to napi_gro_cb, and
> makes sure both are set correctly. In the common path there's only one
> write (skb_gro_reset_offset, which replaces skb_set_network_header).
> 
> Signed-off-by: Richard Gobert <richardbgobert@...il.com>
> ---
>  drivers/net/geneve.c           |  1 +
>  drivers/net/vxlan/vxlan_core.c |  1 +
>  include/net/gro.h              | 18 ++++++++++++++++--
>  net/8021q/vlan_core.c          |  2 ++
>  net/core/gro.c                 |  1 +
>  net/ethernet/eth.c             |  1 +
>  net/ipv4/af_inet.c             |  5 +----
>  net/ipv4/gre_offload.c         |  1 +
>  net/ipv6/ip6_offload.c         |  8 ++++----
>  9 files changed, 28 insertions(+), 10 deletions(-)
> 

> +static inline int skb_gro_network_offset(const struct sk_buff *skb)
> +{
> +	return NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark];
> +}
> +


> @@ -236,8 +236,6 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
>  	if (unlikely(!iph))
>  		goto out;
>  
> -	skb_set_network_header(skb, off);
> -

Especially for net, this is still a large patch.

Can we avoid touching all those tunnel callbacks and just set the
offsets in inet_gro_receive and ipv6_gro_receive themselves, just
as skb_set_network_header now:

@@ -236,7 +236,7 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head,
        if (unlikely(!iph))
                goto out;
 
-       skb_set_network_header(skb, off);
+       NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = off;