Subject: Re: [PATCH] netns: embed ip6_dst_ops directly

From: Daniel Lezcano <[email-masked]>
Date: Sat, 29 Aug 2009 22:27:09 +0200

Alexey Dobriyan wrote:
> struct net::ipv6.ip6_dst_ops is separatedly dynamically allocated,
> but there is no fundamental reason for it. Embed it directly into
> struct netns_ipv6.
> 
> For that:
> * move struct dst_ops into separate header to fix circular dependencies
> 	I honestly tried not to, it's pretty impossible to do other way
> * drop dynamical allocation, allocate together with netns
> 
> For a change, remove struct dst_ops::dst_net, it's deducible
> by using container_of() given dst_ops pointer.
> 
> Signed-off-by: Alexey Dobriyan <[email-masked]>
> ---
> 
>  include/net/dst.h        |   23 +----------------------
>  include/net/dst_ops.h    |   28 ++++++++++++++++++++++++++++
>  include/net/netns/ipv6.h |    3 ++-
>  net/ipv6/route.c         |   34 +++++++++++++---------------------
>  4 files changed, 44 insertions(+), 44 deletions(-)
> 
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -8,6 +8,7 @@
>  #ifndef _NET_DST_H
>  #define _NET_DST_H
> 
> +#include <net/dst_ops.h>
>  #include <linux/netdevice.h>
>  #include <linux/rtnetlink.h>
>  #include <linux/rcupdate.h>
> @@ -102,28 +103,6 @@ struct dst_entry
>  	};
>  };
> 
> -
> -struct dst_ops
> -{
> -	unsigned short		family;
> -	__be16			protocol;
> -	unsigned		gc_thresh;
> -
> -	int			(*gc)(struct dst_ops *ops);
> -	struct dst_entry *	(*check)(struct dst_entry *, __u32 cookie);
> -	void			(*destroy)(struct dst_entry *);
> -	void			(*ifdown)(struct dst_entry *,
> -					  struct net_device *dev, int how);
> -	struct dst_entry *	(*negative_advice)(struct dst_entry *);
> -	void			(*link_failure)(struct sk_buff *);
> -	void			(*update_pmtu)(struct dst_entry *dst, u32 mtu);
> -	int			(*local_out)(struct sk_buff *skb);
> -
> -	atomic_t		entries;
> -	struct kmem_cache 		*kmem_cachep;
> -	struct net              *dst_net;
> -};

You will lose entries, kmem_cachep and gc_thresh per namespace, no ?