netdev - Re: [PATCH net-next] neighbor: Add protocol attribute

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Date:   Fri, 7 Dec 2018 14:20:07 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, roopa@...ulusnetworks.com,
        David Ahern <dsahern@...il.com>
Subject: Re: [PATCH net-next] neighbor: Add protocol attribute



On 12/07/2018 01:49 PM, David Ahern wrote:
> From: David Ahern <dsahern@...il.com>
> 
> Similar to routes and rules, add protocol attribute to neighbor entries
> for easier tracking of how each was created.
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---
>  include/net/neighbour.h        |  2 ++
>  include/uapi/linux/neighbour.h |  1 +
>  net/core/neighbour.c           | 24 +++++++++++++++++++++++-
>  3 files changed, 26 insertions(+), 1 deletion(-)
> 
> diff --git a/include/net/neighbour.h b/include/net/neighbour.h
> index 6c13072910ab..e93c59df9501 100644
> --- a/include/net/neighbour.h
> +++ b/include/net/neighbour.h
> @@ -149,6 +149,7 @@ struct neighbour {
>  	__u8			nud_state;
>  	__u8			type;
>  	__u8			dead;
> +	u8			protocol;
>  	seqlock_t		ha_lock;
>  	unsigned char		ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];

This looks like ha[] alignment would change, I am not sure how critical it is.

>  	struct hh_cache		hh;
> @@ -173,6 +174,7 @@ struct pneigh_entry {
>  	possible_net_t		net;
>  	struct net_device	*dev;
>  	u8			flags;
> +	u8			protocol;
>  	u8			key[0];
>  };
>