linux-kernel - Re: [PATCH net 7/7] openvswitch: Change CT_ATTR_FLAGS to CT_ATTR

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Date:	Wed, 30 Sep 2015 17:32:02 -0700
From:	Pravin Shelar <pshelar@...ira.com>
To:	Joe Stringer <joestringer@...ira.com>
Cc:	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net 7/7] openvswitch: Change CT_ATTR_FLAGS to CT_ATTR_COMMIT

On Tue, Sep 29, 2015 at 3:39 PM, Joe Stringer <joestringer@...ira.com> wrote:
> Previously, the CT_ATTR_FLAGS attribute, when nested under the
> OVS_ACTION_ATTR_CT, encoded a 32-bit bitmask of flags that modify the
> semantics of the ct action. It's more extensible to just represent each
> flag as a nested attribute, and this requires no additional error
> checking to reject flags that aren't currently supported.
>
> Suggested-by: Ben Pfaff <blp@...ira.com>
> Signed-off-by: Joe Stringer <joestringer@...ira.com>
> ---
...
...

> diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
> index 167cf43..effa78c 100644
> --- a/net/openvswitch/conntrack.c
> +++ b/net/openvswitch/conntrack.c
> @@ -42,12 +42,18 @@ struct md_label {
>         struct ovs_key_ct_label mask;
>  };
>
> +/* Flags for performing connection tracking.
> + *
> + * CT_F_COMMIT: Commits the flow to the conntrack table.
> + */
> +#define CT_F_COMMIT    BIT(0)
> +
>  /* Conntrack action context for execution. */
>  struct ovs_conntrack_info {
>         struct nf_conntrack_helper *helper;
>         struct nf_conntrack_zone zone;
>         struct nf_conn *ct;
> -       u32 flags;
> +       u8 flags;               /* bitmask of CT_F_*. */

I think bit field has better readability in such use case.
Otherwise looks good.
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