[ovs-dev,net-next,v2,3/4] ip_tunnels: introduce ip6_tunnel_key_init

We already have ip_tunnel_key_init, this does the same for IPv6. Will be
used also by openvswitch in the next patch.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
---
New patch in v2 of the set.
---
 include/net/dst_metadata.h | 18 ++++++------------
 include/net/ip_tunnels.h   | 40 +++++++++++++++++++++++++++++++---------
 2 files changed, 37 insertions(+), 21 deletions(-)

On Thu, Oct 1, 2015 at 7:44 AM, Jiri Benc <jbenc@redhat.com> wrote:
> We already have ip_tunnel_key_init, this does the same for IPv6. Will be
> used also by openvswitch in the next patch.
>
> Signed-off-by: Jiri Benc <jbenc@redhat.com>
> ---
> New patch in v2 of the set.
> ---
>  include/net/dst_metadata.h | 18 ++++++------------
>  include/net/ip_tunnels.h   | 40 +++++++++++++++++++++++++++++++---------
>  2 files changed, 37 insertions(+), 21 deletions(-)
>
> diff --git a/include/net/dst_metadata.h b/include/net/dst_metadata.h
> index af9d5382f6cb..30e925aba1a4 100644
> --- a/include/net/dst_metadata.h
> +++ b/include/net/dst_metadata.h
> @@ -85,23 +85,17 @@ static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
>  {
>         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
>         struct metadata_dst *tun_dst;
> -       struct ip_tunnel_info *info;
>
>         tun_dst = tun_rx_dst(md_size);
>         if (!tun_dst)
>                 return NULL;
>
> -       info = &tun_dst->u.tun_info;
> -       info->mode = IP_TUNNEL_INFO_IPV6;
> -       info->key.tun_flags = flags;
> -       info->key.tun_id = tunnel_id;
> -       info->key.tp_src = 0;
> -       info->key.tp_dst = 0;
> -
> -       info->key.u.ipv6.src = ip6h->saddr;
> -       info->key.u.ipv6.dst = ip6h->daddr;
> -       info->key.tos = ipv6_get_dsfield(ip6h);
> -       info->key.ttl = ip6h->hop_limit;
> +       tun_dst->u.tun_info.mode = IP_TUNNEL_INFO_IPV6;
> +       ip6_tunnel_key_init(&tun_dst->u.tun_info.key,
> +                           &ip6h->saddr, &ip6h->daddr,
> +                           ipv6_get_dsfield(ip6h), ip6h->hop_limit,
> +                           0, 0, tunnel_id, flags);
> +
>         return tun_dst;
>  }
>
> diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
> index f6dafec9102c..087b2e24e5e0 100644
> --- a/include/net/ip_tunnels.h
> +++ b/include/net/ip_tunnels.h
> @@ -179,17 +179,12 @@ int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *op,
>  int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *op,
>                             unsigned int num);
>
> -static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
> -                                     __be32 saddr, __be32 daddr,
> -                                     u8 tos, u8 ttl,
> -                                     __be16 tp_src, __be16 tp_dst,
> -                                     __be64 tun_id, __be16 tun_flags)
> +static inline void __ip_tunnel_key_init(struct ip_tunnel_key *key,
> +                                       u8 tos, u8 ttl,
> +                                       __be16 tp_src, __be16 tp_dst,
> +                                       __be64 tun_id, __be16 tun_flags)
>  {
>         key->tun_id = tun_id;
> -       key->u.ipv4.src = saddr;
> -       key->u.ipv4.dst = daddr;
> -       memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
> -              0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
>         key->tos = tos;
>         key->ttl = ttl;
>         key->tun_flags = tun_flags;
> @@ -207,6 +202,33 @@ static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
>                        0, sizeof(*key) - IP_TUNNEL_KEY_SIZE);
>  }
>
> +static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
> +                                     __be32 saddr, __be32 daddr,
> +                                     u8 tos, u8 ttl,
> +                                     __be16 tp_src, __be16 tp_dst,
> +                                     __be64 tun_id, __be16 tun_flags)
> +{
> +       __ip_tunnel_key_init(key, tos, ttl, tp_src, tp_dst, tun_id,
> +                            tun_flags);
> +       key->u.ipv4.src = saddr;
> +       key->u.ipv4.dst = daddr;
> +       memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
> +              0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
neat: since IP_TUNNEL_KEY_IPV4_PAD not really IPv4 tunnel key padding
anymore, This also needs to be renamed.

otherwise looks good.

Acked-by: Pravin B Shelar <pshelar@nicira.com>

On Thu, 1 Oct 2015 17:11:43 -0700, Pravin Shelar wrote:
> On Thu, Oct 1, 2015 at 7:44 AM, Jiri Benc <jbenc@redhat.com> wrote:
> > +static inline void ip_tunnel_key_init(struct ip_tunnel_key *key,
> > +                                     __be32 saddr, __be32 daddr,
> > +                                     u8 tos, u8 ttl,
> > +                                     __be16 tp_src, __be16 tp_dst,
> > +                                     __be64 tun_id, __be16 tun_flags)
> > +{
> > +       __ip_tunnel_key_init(key, tos, ttl, tp_src, tp_dst, tun_id,
> > +                            tun_flags);
> > +       key->u.ipv4.src = saddr;
> > +       key->u.ipv4.dst = daddr;
> > +       memset((unsigned char *)key + IP_TUNNEL_KEY_IPV4_PAD,
> > +              0, IP_TUNNEL_KEY_IPV4_PAD_LEN);
> neat: since IP_TUNNEL_KEY_IPV4_PAD not really IPv4 tunnel key padding
> anymore, This also needs to be renamed.

It is IPv4 address padding. It is used to zero out the part of the
union of IPv6 and IPv4 addresses that is not occupied by IPv4
addresses. The name was just too long to include "ADDR", too.

The original pad constant was renamed to IP_TUNNEL_KEY_SIZE, thus is
not referencing IPv4 anymore.

> otherwise looks good.
> 
> Acked-by: Pravin B Shelar <pshelar@nicira.com>

Thanks,

 Jiri