From 1faa4356a3bd89ea11fb92752d897cff3a20ec0e Mon Sep 17 00:00:00 2001 From: stephen hemminger Date: Mon, 7 Mar 2011 08:34:06 +0000 Subject: [PATCH] bridge: control carrier based on ports online MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit This makes the bridge device behave like a physical device. In earlier releases the bridge always asserted carrier. This changes the behavior so that bridge device carrier is on only if one or more ports are in the forwarding state. This should help IPv6 autoconfiguration, DHCP, and routing daemons. I did brief testing with Network and Virt manager and they seem fine, but since this changes behavior of bridge, it should wait until net-next (2.6.39). Signed-off-by: Stephen Hemminger Reviewed-by: Nicolas de Pesloüan Tested-By: Adam Majer Signed-off-by: David S. Miller --- net/bridge/br_device.c | 4 ++++ net/bridge/br_stp.c | 35 ++++++++++++++++++++++------------- net/bridge/br_stp_timer.c | 1 + 3 files changed, 27 insertions(+), 13 deletions(-) diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c index 1461b19efd38..21e5901186ea 100644 --- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -78,6 +78,8 @@ static int br_dev_open(struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); + netif_carrier_off(dev); + br_features_recompute(br); netif_start_queue(dev); br_stp_enable_bridge(br); @@ -94,6 +96,8 @@ static int br_dev_stop(struct net_device *dev) { struct net_bridge *br = netdev_priv(dev); + netif_carrier_off(dev); + br_stp_disable_bridge(br); br_multicast_stop(br); diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c index 57186d84d2bd..a5badd0f8226 100644 --- a/net/bridge/br_stp.c +++ b/net/bridge/br_stp.c @@ -397,28 +397,37 @@ static void br_make_forwarding(struct net_bridge_port *p) void br_port_state_selection(struct net_bridge *br) { struct net_bridge_port *p; + unsigned int liveports = 0; /* Don't change port states if userspace is handling STP */ if (br->stp_enabled == BR_USER_STP) return; list_for_each_entry(p, &br->port_list, list) { - if (p->state != BR_STATE_DISABLED) { - if (p->port_no == br->root_port) { - p->config_pending = 0; - p->topology_change_ack = 0; - br_make_forwarding(p); - } else if (br_is_designated_port(p)) { - del_timer(&p->message_age_timer); - br_make_forwarding(p); - } else { - p->config_pending = 0; - p->topology_change_ack = 0; - br_make_blocking(p); - } + if (p->state == BR_STATE_DISABLED) + continue; + + if (p->port_no == br->root_port) { + p->config_pending = 0; + p->topology_change_ack = 0; + br_make_forwarding(p); + } else if (br_is_designated_port(p)) { + del_timer(&p->message_age_timer); + br_make_forwarding(p); + } else { + p->config_pending = 0; + p->topology_change_ack = 0; + br_make_blocking(p); } + if (p->state == BR_STATE_FORWARDING) + ++liveports; } + + if (liveports == 0) + netif_carrier_off(br->dev); + else + netif_carrier_on(br->dev); } /* called under bridge lock */ diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c index 7b22456023c5..3e965140051e 100644 --- a/net/bridge/br_stp_timer.c +++ b/net/bridge/br_stp_timer.c @@ -94,6 +94,7 @@ static void br_forward_delay_timer_expired(unsigned long arg) p->state = BR_STATE_FORWARDING; if (br_is_designated_for_some_port(br)) br_topology_change_detection(br); + netif_carrier_on(br->dev); } br_log_state(p); spin_unlock(&br->lock); -- 2.30.2