netdev - Re: [PATCH 2/6] vxlan: Group Policy extension

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Date:	Mon, 12 Jan 2015 11:23:28 -0800
From:	Jesse Gross <jesse@...ira.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	David Miller <davem@...emloft.net>,
	Stephen Hemminger <stephen@...workplumber.org>,
	Pravin Shelar <pshelar@...ira.com>,
	Tom Herbert <therbert@...gle.com>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	"dev@...nvswitch.org" <dev@...nvswitch.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/6] vxlan: Group Policy extension

On Mon, Jan 12, 2015 at 4:26 AM, Thomas Graf <tgraf@...g.ch> wrote:
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index 4d52aa9..b148739 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -568,7 +569,8 @@ static struct sk_buff **vxlan_gro_receive(struct sk_buff **head, struct sk_buff
>                         continue;
>
>                 vh2 = (struct vxlanhdr *)(p->data + off_vx);
> -               if (vh->vx_vni != vh2->vx_vni) {
> +               if (vh->vx_flags != vh2->vx_flags ||
> +                   vh->vx_vni != vh2->vx_vni) {

It's probably better to do a memcmp over the entire header. There's no
guarantee that new fields will be entirely represented by flags.

> diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
> index d7c46b3..dd68c97 100644
> --- a/net/openvswitch/vport-vxlan.c
> +++ b/net/openvswitch/vport-vxlan.c
> @@ -146,6 +147,7 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
>         struct vxlan_port *vxlan_port = vxlan_vport(vport);
>         __be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
>         struct ovs_key_ipv4_tunnel *tun_key;
> +       struct vxlan_metadata md;

It might be a good idea to zero out 'md', even if not strictly required.
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