Subject: Re: [PATCH net-next] Configure bridge FDB ageing time using netlink.

From: roopa <[email-masked]>
Date: Fri, 13 Mar 2015 07:00:08 -0700

On 3/13/15, 5:10 AM, Siva Mannem wrote:
> Signed-off-by: Siva Mannem <[email-masked]>

you will need to specify some details in the comment.
some can be borrowed from your code comments below
like reference to the 'ieee8021QBridgeFdbAgingTime'.

> ---
>   include/uapi/linux/if_link.h |  1 +
>   net/bridge/br_device.c       | 13 +++++++++++++
>   net/bridge/br_netlink.c      | 14 ++++++++++++--
>   net/bridge/br_private.h      |  5 +++++
>   4 files changed, 31 insertions(+), 2 deletions(-)
>
> diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
> index 756436e..4a59232 100644
> --- a/include/uapi/linux/if_link.h
> +++ b/include/uapi/linux/if_link.h
> @@ -224,6 +224,7 @@ enum {
>   	IFLA_BR_FORWARD_DELAY,
>   	IFLA_BR_HELLO_TIME,
>   	IFLA_BR_MAX_AGE,
> +	IFLA_BR_AGEING_TIME,
>   	__IFLA_BR_MAX,
>   };
>   
> diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
> index 294cbcc..1a665aa 100644
> --- a/net/bridge/br_device.c
> +++ b/net/bridge/br_device.c
> @@ -392,3 +392,16 @@ void br_dev_setup(struct net_device *dev)
>   	br_stp_timer_init(br);
>   	br_multicast_init(br);
>   }
> +
> +int br_set_ageing_time(struct net_bridge *br, unsigned long val)
> +{
> +	unsigned long t = clock_t_to_jiffies(val);
> +
> +	if (t < BR_MIN_AGEING_TIME || t > BR_MAX_AGEING_TIME)
> +		return -ERANGE;
> +
> +	spin_lock_bh(&br->lock);
> +	br->ageing_time = t;
> +	spin_unlock_bh(&br->lock);
> +	return 0;
> +}
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index 8bc6b67..d80e802 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -733,6 +733,7 @@ static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
>   	[IFLA_BR_FORWARD_DELAY]	= { .type = NLA_U32 },
>   	[IFLA_BR_HELLO_TIME]	= { .type = NLA_U32 },
>   	[IFLA_BR_MAX_AGE]	= { .type = NLA_U32 },
> +	[IFLA_BR_AGEING_TIME]	= { .type = NLA_U32 },
>   };
>   
>   static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
> @@ -762,6 +763,12 @@ static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
>   			return err;
>   	}
>   
> +	if (data[IFLA_BR_AGEING_TIME]) {
> +		err = br_set_ageing_time(br, nla_get_u32(data[IFLA_BR_AGEING_TIME]));
> +		if (err)
> +			return err;
> +	}
> +
>   	return 0;
>   }
>   
> @@ -770,6 +777,7 @@ static size_t br_get_size(const struct net_device *brdev)
>   	return nla_total_size(sizeof(u32)) +	/* IFLA_BR_FORWARD_DELAY  */
>   	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_HELLO_TIME */
>   	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_MAX_AGE */
> +	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_AGEING_TIME */
>   	       0;
>   }
>   
> @@ -778,11 +786,13 @@ static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
>   	struct net_bridge *br = netdev_priv(brdev);
>   	u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
>   	u32 hello_time = jiffies_to_clock_t(br->hello_time);
> -	u32 age_time = jiffies_to_clock_t(br->max_age);
> +	u32 max_age = jiffies_to_clock_t(br->max_age);
> +	u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
>   
>   	if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
>   	    nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
> -	    nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
> +	    nla_put_u32(skb, IFLA_BR_MAX_AGE, max_age) ||
> +	    nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time))
>   		return -EMSGSIZE;
>   
>   	return 0;
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index f0a0438..819761b 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -25,6 +25,10 @@
>   
>   #define BR_HOLD_TIME (1*HZ)
>   
> +/* values as per ieee8021QBridgeFdbAgingTime */
> +#define BR_MIN_AGEING_TIME  (10*HZ)
> +#define BR_MAX_AGEING_TIME  (1000000*HZ)
> +
>   #define BR_PORT_BITS	10
>   #define BR_MAX_PORTS	(1<<BR_PORT_BITS)
>   #define BR_VLAN_BITMAP_LEN	BITS_TO_LONGS(VLAN_N_VID)
> @@ -345,6 +349,7 @@ static inline int br_is_root_bridge(const struct net_bridge *br)
>   void br_dev_setup(struct net_device *dev);
>   void br_dev_delete(struct net_device *dev, struct list_head *list);
>   netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
> +int br_set_ageing_time(struct net_bridge *br, unsigned long val);
>   #ifdef CONFIG_NET_POLL_CONTROLLER
>   static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
>   				       struct sk_buff *skb)