netdev - Re: [patch net-next 05/12] net: ipmr: Add MFC offload indication

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Date:   Thu, 21 Sep 2017 14:27:59 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Jiri Pirko <jiri@...nulli.us>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, yotamg@...lanox.com, idosch@...lanox.com,
        mlxsw@...lanox.com
Subject: Re: [patch net-next 05/12] net: ipmr: Add MFC offload indication

On 21/09/17 09:43, Jiri Pirko wrote:
> From: Yotam Gigi <yotamg@...lanox.com>
> 
> Allow drivers, registered to the fib notification chain indicate whether a
> multicast MFC route is offloaded or not, similarly to unicast routes. The
> indication of whether a route is offloaded is done using the mfc_flags
> field on an mfc_cache struct, and the information is sent to the userspace
> via the RTNetlink interface only.
> 
> Currently, MFC routes are either offloaded or not, thus there is no need to
> add per-VIF offload indication.
> 
> Signed-off-by: Yotam Gigi <yotamg@...lanox.com>
> Reviewed-by: Ido Schimmel <idosch@...lanox.com>
> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
> ---
>  include/linux/mroute.h | 1 +
>  net/ipv4/ipmr.c        | 3 +++
>  2 files changed, 4 insertions(+)
> 
> diff --git a/include/linux/mroute.h b/include/linux/mroute.h
> index ba5a976..9b64587 100644
> --- a/include/linux/mroute.h
> +++ b/include/linux/mroute.h
> @@ -93,6 +93,7 @@ struct mr_table {
>   */
>  enum {
>  	MFC_STATIC = BIT(0),
> +	MFC_OFFLOAD = BIT(1),
>  };

It maybe redundant but above this enum is a comment with flag descriptions,
since you're adding a new flag could you also please add a short
description above ?

>  
>  struct mfc_cache_cmp_arg {
> diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
> index 7891d95..6804885 100644
> --- a/net/ipv4/ipmr.c
> +++ b/net/ipv4/ipmr.c
> @@ -2268,6 +2268,9 @@ static int __ipmr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb,
>  	    nla_put_u32(skb, RTA_IIF, mrt->vif_table[c->mfc_parent].dev->ifindex) < 0)
>  		return -EMSGSIZE;
>  
> +	if (c->mfc_flags & MFC_OFFLOAD)
> +		rtm->rtm_flags |= RTNH_F_OFFLOAD;
> +
>  	if (!(mp_attr = nla_nest_start(skb, RTA_MULTIPATH)))
>  		return -EMSGSIZE;
>  
>