netdev - Re: [PATCHv2] skbedit: allow the user to specify bitmask for mark

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Date:	Wed, 23 Jul 2014 10:16:56 -0700
From:	Cong Wang <cwang@...pensource.com>
To:	Antonio Quartulli <antonio@...hcoding.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	sergei.shtylyov@...entembedded.com,
	Eric Dumazet <eric.dumazet@...il.com>,
	Antonio Quartulli <antonio@...n-mesh.com>,
	Jamal Hadi Salim <jhs@...atatu.com>
Subject: Re: [PATCHv2] skbedit: allow the user to specify bitmask for mark

On Wed, Jul 23, 2014 at 1:03 AM, Antonio Quartulli
<antonio@...hcoding.com> wrote:
>  #define TCA_SKBEDIT_MAX (__TCA_SKBEDIT_MAX - 1)
> diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
> index fcfeeaf..6111b06 100644
> --- a/net/sched/act_skbedit.c
> +++ b/net/sched/act_skbedit.c
> @@ -43,8 +43,12 @@ static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
>         if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
>             skb->dev->real_num_tx_queues > d->queue_mapping)
>                 skb_set_queue_mapping(skb, d->queue_mapping);
> -       if (d->flags & SKBEDIT_F_MARK)
> -               skb->mark = d->mark;
> +       if (d->flags & SKBEDIT_F_MARK) {
> +               /* unset all the bits in the mask */
> +               skb->mark &= ~d->mask;
> +               /* assign the mark value for the masked bit only */
> +               skb->mark |= d->mark & d->mask;

The comments are useless, code is already clear.
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