bridge: add support for user mode STP
This patchset based on work by Aji_Srinivas@emc.com provides allows
spanning tree to be controled from userspace. Like hotplug, it
uses call_usermodehelper when spanning tree is enabled so there
is no visible API change. If call to start usermode STP fails
it falls back to existing kernel STP.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index f9ff4d5..ebb0861 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -370,11 +370,11 @@
static void br_make_forwarding(struct net_bridge_port *p)
{
if (p->state == BR_STATE_BLOCKING) {
- if (p->br->stp_enabled) {
+ if (p->br->stp_enabled == BR_KERNEL_STP)
p->state = BR_STATE_LISTENING;
- } else {
+ else
p->state = BR_STATE_LEARNING;
- }
+
br_log_state(p);
mod_timer(&p->forward_delay_timer, jiffies + p->br->forward_delay); }
}
@@ -384,6 +384,10 @@
{
struct net_bridge_port *p;
+ /* 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) {