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Subject: Re: [PATCH net-next v4 12/12] net: bridge: Add port attribute
 IFLA_BRPORT_MRP_IN_OPEN
To:     Horatiu Vultur <horatiu.vultur@microchip.com>,
        roopa@cumulusnetworks.com, davem@davemloft.net, kuba@kernel.org,
        jiri@resnulli.us, ivecera@redhat.com, andrew@lunn.ch,
        UNGLinuxDriver@microchip.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, bridge@lists.linux-foundation.org
References: <20200714073458.1939574-1-horatiu.vultur@microchip.com>
 <20200714073458.1939574-13-horatiu.vultur@microchip.com>
From:   Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Message-ID: <9eeb89c5-865f-2b21-c7c6-7f4479bf4175@cumulusnetworks.com>
Date:   Tue, 14 Jul 2020 16:29:33 +0300
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On 14/07/2020 10:34, Horatiu Vultur wrote:
> This patch adds a new port attribute, IFLA_BRPORT_MRP_IN_OPEN, which
> allows to notify the userspace when the node lost the contiuity of
> MRP_InTest frames.
> 
> Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
> ---
>  include/uapi/linux/if_link.h       | 1 +
>  net/bridge/br_netlink.c            | 3 +++
>  tools/include/uapi/linux/if_link.h | 1 +
>  3 files changed, 5 insertions(+)
> 

It's kind of late by now, but I'd wish these were contained in a nested MRP attribute. :)
Horatiu, do you expect to have many more MRP attributes outside of MRP netlink code?

Perhaps we should at least dump them only for MRP-aware ports, that should be easy.
They make no sense outside of MRP anyway, but increase the size of the dump for all
right now.

Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>

> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index cc185a007ade8..26842ffd0501d 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -344,6 +344,7 @@ enum {
>  	IFLA_BRPORT_ISOLATED,
>  	IFLA_BRPORT_BACKUP_PORT,
>  	IFLA_BRPORT_MRP_RING_OPEN,
> +	IFLA_BRPORT_MRP_IN_OPEN,
>  	__IFLA_BRPORT_MAX
>  };
>  #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index c532fa65c9834..147d52596e174 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -152,6 +152,7 @@ static inline size_t br_port_info_size(void)
>  #endif
>  		+ nla_total_size(sizeof(u16))	/* IFLA_BRPORT_GROUP_FWD_MASK */
>  		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MRP_RING_OPEN */
> +		+ nla_total_size(sizeof(u8))	/* IFLA_BRPORT_MRP_IN_OPEN */
>  		+ 0;
>  }
>  
> @@ -216,6 +217,8 @@ static int br_port_fill_attrs(struct sk_buff *skb,
>  		       !!(p->flags & BR_NEIGH_SUPPRESS)) ||
>  	    nla_put_u8(skb, IFLA_BRPORT_MRP_RING_OPEN, !!(p->flags &
>  							  BR_MRP_LOST_CONT)) ||
> +	    nla_put_u8(skb, IFLA_BRPORT_MRP_IN_OPEN,
> +		       !!(p->flags & BR_MRP_LOST_IN_CONT)) ||
>  	    nla_put_u8(skb, IFLA_BRPORT_ISOLATED, !!(p->flags & BR_ISOLATED)))
>  		return -EMSGSIZE;
>  
> diff --git a/tools/include/uapi/linux/if_link.h b/tools/include/uapi/linux/if_link.h
> index cafedbbfefbe9..781e482dc499f 100644
> --- a/tools/include/uapi/linux/if_link.h
> +++ b/tools/include/uapi/linux/if_link.h
> @@ -344,6 +344,7 @@ enum {
>  	IFLA_BRPORT_ISOLATED,
>  	IFLA_BRPORT_BACKUP_PORT,
>  	IFLA_BRPORT_MRP_RING_OPEN,
> +	IFLA_BRPORT_MRP_IN_OPEN,
>  	__IFLA_BRPORT_MAX
>  };
>  #define IFLA_BRPORT_MAX (__IFLA_BRPORT_MAX - 1)
>