netdev - Re: [patch net-next v2 1/4] openvswitch: actions: use skb_postpull

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Message-ID: <CALnjE+qX9M_1UuyMKD9CaSmTUSY-GtyWgW8dZHzY+294fv9=Hg@mail.gmail.com>
Date:	Wed, 12 Nov 2014 11:13:29 -0800
From:	Pravin Shelar <pshelar@...ira.com>
To:	Jiri Pirko <jiri@...nulli.us>
Cc:	netdev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	Tom Herbert <therbert@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Willem de Bruijn <willemb@...gle.com>,
	Daniel Borkmann <dborkman@...hat.com>, mst@...hat.com,
	fw@...len.de, Paul.Durrant@...rix.com, Thomas Graf <tgraf@...g.ch>
Subject: Re: [patch net-next v2 1/4] openvswitch: actions: use
 skb_postpull_rcsum when possible

On Wed, Nov 12, 2014 at 6:52 AM, Jiri Pirko <jiri@...nulli.us> wrote:
> Replace duplicated code by calling skb_postpull_rcsum
>
> Suggested-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Jiri Pirko <jiri@...nulli.us>

Looks good.
Acked-by: Pravin B Shelar <pshelar@...ira.com>

> ---
>  net/openvswitch/actions.c | 9 ++-------
>  1 file changed, 2 insertions(+), 7 deletions(-)
>
> diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
> index 394efa6..749a301 100644
> --- a/net/openvswitch/actions.c
> +++ b/net/openvswitch/actions.c
> @@ -175,10 +175,7 @@ static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
>         if (unlikely(err))
>                 return err;
>
> -       if (skb->ip_summed == CHECKSUM_COMPLETE)
> -               skb->csum = csum_sub(skb->csum,
> -                                    csum_partial(skb_mpls_header(skb),
> -                                                 MPLS_HLEN, 0));
> +       skb_postpull_rcsum(skb, skb_mpls_header(skb), MPLS_HLEN);
>
>         memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb),
>                 skb->mac_len);
> @@ -230,9 +227,7 @@ static int __pop_vlan_tci(struct sk_buff *skb, __be16 *current_tci)
>         if (unlikely(err))
>                 return err;
>
> -       if (skb->ip_summed == CHECKSUM_COMPLETE)
> -               skb->csum = csum_sub(skb->csum, csum_partial(skb->data
> -                                       + (2 * ETH_ALEN), VLAN_HLEN, 0));
> +       skb_postpull_rcsum(skb, skb->data + (2 * ETH_ALEN), VLAN_HLEN);
>
>         vhdr = (struct vlan_hdr *)(skb->data + ETH_HLEN);
>         *current_tci = vhdr->h_vlan_TCI;
> --
> 1.9.3
>
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