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bridge: stp: when using userspace stp stop kernel hello and hold timers 

These should be handled only by the respective STP which is in control.
They become problematic for devices with limited resources with many
ports because the hold_timer is per port and fires each second and the
hello timer fires each 2 seconds even though it's global. While in
user-space STP mode these timers are completely unnecessary so it's better
to keep them off.
Also ensure that when the bridge is up these timers are started only when
running with kernel STP.

Signed-off-by: Satish Ashok <sashok@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
steinar/wifi_calib_4_9_kernel
Nikolay Aleksandrov 2015-07-23 11:01:05 -07:00 committed by David S. Miller
parent 158cd4af8d
commit 76b91c32dd
3 changed files with 18 additions and 4 deletions
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5
net/bridge/br_stp.c
View File

@ -209,8 +209,9 @@ void br_transmit_config(struct net_bridge_port *p)
br_send_config_bpdu(p, &bpdu);
p->topology_change_ack = 0;
p->config_pending = 0;
mod_timer(&p->hold_timer,
round_jiffies(jiffies + BR_HOLD_TIME));
if (p->br->stp_enabled == BR_KERNEL_STP)
mod_timer(&p->hold_timer,
round_jiffies(jiffies + BR_HOLD_TIME));
}
}

13
net/bridge/br_stp_if.c
View File

@ -48,7 +48,8 @@ void br_stp_enable_bridge(struct net_bridge *br)
struct net_bridge_port *p;
spin_lock_bh(&br->lock);
mod_timer(&br->hello_timer, jiffies + br->hello_time);
if (br->stp_enabled == BR_KERNEL_STP)
mod_timer(&br->hello_timer, jiffies + br->hello_time);
mod_timer(&br->gc_timer, jiffies + HZ/10);
br_config_bpdu_generation(br);
@ -127,6 +128,7 @@ static void br_stp_start(struct net_bridge *br)
int r;
char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL };
char *envp[] = { NULL };
struct net_bridge_port *p;
r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
@ -140,6 +142,10 @@ static void br_stp_start(struct net_bridge *br)
if (r == 0) {
br->stp_enabled = BR_USER_STP;
br_debug(br, "userspace STP started\n");
/* Stop hello and hold timers */
del_timer(&br->hello_timer);
list_for_each_entry(p, &br->port_list, list)
del_timer(&p->hold_timer);
} else {
br->stp_enabled = BR_KERNEL_STP;
br_debug(br, "using kernel STP\n");
@ -156,12 +162,17 @@ static void br_stp_stop(struct net_bridge *br)
int r;
char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL };
char *envp[] = { NULL };
struct net_bridge_port *p;
if (br->stp_enabled == BR_USER_STP) {
r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
br_info(br, "userspace STP stopped, return code %d\n", r);
/* To start timers on any ports left in blocking */
mod_timer(&br->hello_timer, jiffies + br->hello_time);
list_for_each_entry(p, &br->port_list, list)
mod_timer(&p->hold_timer,
round_jiffies(jiffies + BR_HOLD_TIME));
spin_lock_bh(&br->lock);
br_port_state_selection(br);
spin_unlock_bh(&br->lock);

4
net/bridge/br_stp_timer.c
View File

@ -40,7 +40,9 @@ static void br_hello_timer_expired(unsigned long arg)
if (br->dev->flags & IFF_UP) {
br_config_bpdu_generation(br);
mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time));
if (br->stp_enabled != BR_USER_STP)
mod_timer(&br->hello_timer,
round_jiffies(jiffies + br->hello_time));
}
spin_unlock(&br->lock);
}