netdev - Re: [PATCH net-next 04/13] ip_tunnels: add IPv6 addresses to ip_tunnel

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Date:	Tue, 18 Aug 2015 17:36:32 -0700
From:	Alexei Starovoitov <alexei.starovoitov@...il.com>
To:	Jiri Benc <jbenc@...hat.com>
Cc:	netdev@...r.kernel.org, Thomas Graf <tgraf@...g.ch>
Subject: Re: [PATCH net-next 04/13] ip_tunnels: add IPv6 addresses to
 ip_tunnel_key

On Tue, Aug 18, 2015 at 10:33:13PM +0200, Jiri Benc wrote:
> Signed-off-by: Jiri Benc <jbenc@...hat.com>
> ---
>  drivers/net/vxlan.c            |  6 +++---
>  include/net/ip_tunnels.h       | 23 +++++++++++++++++++----
>  net/core/filter.c              |  4 ++--
>  net/ipv4/ip_gre.c              | 10 +++++-----
>  net/ipv4/ip_tunnel_core.c      |  8 ++++----
>  net/openvswitch/flow_netlink.c | 18 +++++++++---------
>  net/openvswitch/flow_table.c   |  2 +-
>  net/openvswitch/vport-geneve.c |  2 +-
>  net/openvswitch/vport.c        |  2 +-
>  net/openvswitch/vport.h        |  4 ++--
>  10 files changed, 47 insertions(+), 32 deletions(-)

please add commit message. +47 -32 cannot be empty.

> +/* Used to memset ipv4 address padding. */
> +#define IP_TUNNEL_KEY_IPV4_PAD	offsetofend(struct ip_tunnel_key, u.ipv4.dst)
> +#define IP_TUNNEL_KEY_IPV4_PAD_LEN				\
> +	(FIELD_SIZEOF(struct ip_tunnel_key, u) - IP_TUNNEL_KEY_IPV4_PAD)
> +
>  struct ip_tunnel_key {
>  	__be64			tun_id;
> -	__be32			ipv4_src;
> -	__be32			ipv4_dst;
> +	union {
> +		struct {
> +			__be32	src;
> +			__be32	dst;
> +		} ipv4;
> +		struct {
> +			struct in6_addr src;
> +			struct in6_addr dst;
> +		} ipv6;
> +	} u;
...
> +	tun_info->key.u.ipv4.src = saddr;
> +	tun_info->key.u.ipv4.dst = daddr;
> +	memset((unsigned char *)&tun_info->key + IP_TUNNEL_KEY_IPV4_PAD,
> +	       0, IP_TUNNEL_KEY_IPV4_PAD_LEN);

the math looks wrong.
IP_TUNNEL_KEY_IPV4_PAD_LEN = sizeof(u) - offsetofend(u.ipv4.dst)
8 byte mistake?

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