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Date: Wed, 26 Feb 2014 17:41:22 +0200
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Vlad Yasevich <vyasevic@...hat.com>
Cc: netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
shemminger@...tta.com, jhs@...atatu.com, john.r.fastabend@...el.com
Subject: Re: [PATCH 2/7] bridge: Keep track of ports capable of flooding.
On Wed, Feb 26, 2014 at 10:18:20AM -0500, Vlad Yasevich wrote:
> Keep track of bridge ports that have unicast flooding turned on.
> This will later be used by the algorithm to automatically manage
> address programming and promisc mode.
>
> Signed-off-by: Vlad Yasevich <vyasevic@...hat.com>
> ---
> net/bridge/br_if.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++--
> net/bridge/br_netlink.c | 3 +++
> net/bridge/br_private.h | 4 ++++
> net/bridge/br_sysfs_if.c | 6 ++++-
> 4 files changed, 70 insertions(+), 3 deletions(-)
>
> diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
> index 54d207d..f072b34 100644
> --- a/net/bridge/br_if.c
> +++ b/net/bridge/br_if.c
> @@ -27,6 +27,9 @@
>
> #include "br_private.h"
>
> +static void br_add_flood_port(struct net_bridge_port *p, struct net_bridge *br);
> +static void br_del_flood_port(struct net_bridge_port *p, struct net_bridge *br);
> +
same nitpick about forward declarations of static
functions.
maybe they are ok for bridge, but that's my $.02
> /*
> * Determine initial path cost based on speed.
> * using recommendations from 802.1d standard
> @@ -141,11 +144,14 @@ static void del_nbp(struct net_bridge_port *p)
>
> br_ifinfo_notify(RTM_DELLINK, p);
>
> + list_del_rcu(&p->list);
> +
> + if (p->flags & BR_FLOOD)
> + br_del_flood_port(p, br);
> +
> nbp_vlan_flush(p);
> br_fdb_delete_by_port(br, p, 1);
>
> - list_del_rcu(&p->list);
> -
> dev->priv_flags &= ~IFF_BRIDGE_PORT;
>
> netdev_rx_handler_unregister(dev);
ok so it doesn't matter in which order we do
list_del_rcu and nbp_vlan_flush then?
> @@ -383,6 +389,9 @@ int br_add_if(struct net_bridge *br, struct net_device *dev)
> dev_disable_lro(dev);
>
> list_add_rcu(&p->list, &br->port_list);
> +
> + if (p->flags & BR_FLOOD)
> + br_add_flood_port(p, br);
>
> netdev_update_features(br->dev);
>
> @@ -455,3 +464,50 @@ int br_del_if(struct net_bridge *br, struct net_device *dev)
>
> return 0;
> }
> +
> +static void br_add_flood_port(struct net_bridge_port *p, struct net_bridge *br)
> +{
> + /* Increment the number of flooding ports, and if we
> + * only have 1 flooding port cache if for future use.
> + */
> + br->n_flood_ports++;
> + if (br->n_flood_ports == 1)
> + br->c_flood_port = p;
> +}
> +
> +static void br_del_flood_port(struct net_bridge_port *p, struct net_bridge *br)
> +{
> + struct net_bridge_port *port;
> +
> + /* Decrement the number of flood port.
> + * If we are deleting the current flood port, clear
> + * the cached port. If we are down to 1 flood port,
> + * set it if it is not set.
> + */
> + br->n_flood_ports--;
> + if (p == br->c_flood_port)
> + br->c_flood_port = NULL;
> +
> + if (br->n_flood_ports == 1) {
> + list_for_each_entry(port, &p->br->port_list, list) {
> + if (port->flags & BR_FLOOD) {
> + br->c_flood_port = port;
> + break;
> + }
> + }
> + }
> +}
> +
> +void br_port_flags_change(struct net_bridge_port *p, unsigned long mask)
> +{
> + struct net_bridge *br = p->br;
> +
> + /* We are only interested FLOOD flag */
> + if (!(mask & BR_FLOOD))
> + return;
> +
> + if (p->flags & BR_FLOOD)
> + br_add_flood_port(p, br);
> + else
> + br_del_flood_port(p, br);
> +}
> diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
> index e74b6d53..01382b9 100644
> --- a/net/bridge/br_netlink.c
> +++ b/net/bridge/br_netlink.c
> @@ -328,6 +328,7 @@ static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
> static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
> {
> int err;
> + unsigned long old_flags = p->flags;
>
> br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
> br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
> @@ -353,6 +354,8 @@ static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
> if (err)
> return err;
> }
> +
> + br_port_flags_change(p, old_flags ^ p->flags);
> return 0;
> }
>
> diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
> index 3ba11bc..26a3987 100644
> --- a/net/bridge/br_private.h
> +++ b/net/bridge/br_private.h
> @@ -290,6 +290,8 @@ struct net_bridge
> struct timer_list topology_change_timer;
> struct timer_list gc_timer;
> struct kobject *ifobj;
> + struct net_bridge_port *c_flood_port;
> + u32 n_flood_ports;
any hints on locking for these fields?
are these all under rtnl?
> #ifdef CONFIG_BRIDGE_VLAN_FILTERING
> u8 vlan_enabled;
> struct net_port_vlans __rcu *vlan_info;
> @@ -415,6 +417,8 @@ int br_del_if(struct net_bridge *br, struct net_device *dev);
> int br_min_mtu(const struct net_bridge *br);
> netdev_features_t br_features_recompute(struct net_bridge *br,
> netdev_features_t features);
> +void br_port_flags_change(struct net_bridge_port *port,
> + unsigned long mask);
>
> /* br_input.c */
> int br_handle_frame_finish(struct sk_buff *skb);
> diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c
> index 7f66aa4..9ff6691 100644
> --- a/net/bridge/br_sysfs_if.c
> +++ b/net/bridge/br_sysfs_if.c
> @@ -51,7 +51,10 @@ static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR, \
> static int store_flag(struct net_bridge_port *p, unsigned long v,
> unsigned long mask)
> {
> - unsigned long flags = p->flags;
> + unsigned long flags;
> + unsigned long old_flags;
> +
> + old_flags = flags = p->flags;
>
> if (v)
> flags |= mask;
> @@ -60,6 +63,7 @@ static int store_flag(struct net_bridge_port *p, unsigned long v,
>
> if (flags != p->flags) {
> p->flags = flags;
> + br_port_flags_change(p, old_flags ^ flags);
> br_ifinfo_notify(RTM_NEWLINK, p);
> }
> return 0;
> --
> 1.8.5.3
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