netdev - Re: [PATCH net-next 05/10] ipv6: factor out protocol delivery helper

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Date:   Thu, 8 Nov 2018 12:01:59 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
Subject: Re: [PATCH net-next 05/10] ipv6: factor out protocol delivery helper

On 11/7/2018 2:38 PM, Paolo Abeni wrote:

> So that we can re-use it at the UDP level in the next patch
> 
> rfc v3 -> v1:
>   - add the helper declaration into the ipv6 header
> 
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>
> ---
>   include/net/ipv6.h   |  2 ++
>   net/ipv6/ip6_input.c | 28 ++++++++++++++++------------
>   2 files changed, 18 insertions(+), 12 deletions(-)
> 
> diff --git a/include/net/ipv6.h b/include/net/ipv6.h
> index 829650540780..daf80863d3a5 100644
> --- a/include/net/ipv6.h
> +++ b/include/net/ipv6.h
[...]
> @@ -319,28 +319,26 @@ void ipv6_list_rcv(struct list_head *head, struct packet_type *pt,
>   /*
>    *	Deliver the packet to the host
>    */
> -
> -
> -static int ip6_input_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
> +void ip6_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int nexthdr,
> +			      bool have_final)
>   {
>   	const struct inet6_protocol *ipprot;
>   	struct inet6_dev *idev;
>   	unsigned int nhoff;
> -	int nexthdr;
>   	bool raw;
> -	bool have_final = false;
>   
>   	/*
>   	 *	Parse extension headers
>   	 */
>   
> -	rcu_read_lock();
>   resubmit:
>   	idev = ip6_dst_idev(skb_dst(skb));
> -	if (!pskb_pull(skb, skb_transport_offset(skb)))
> -		goto discard;
>   	nhoff = IP6CB(skb)->nhoff;
> -	nexthdr = skb_network_header(skb)[nhoff];
> +	if (!have_final) {

    Haven't you removed this variable above?

> +		if (!pskb_pull(skb, skb_transport_offset(skb)))
> +			goto discard;
> +		nexthdr = skb_network_header(skb)[nhoff];

    And this?

> +	}
>   
>   resubmit_final:
>   	raw = raw6_local_deliver(skb, nexthdr);
[...]

MBR, Sergei