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Subject[PATCH net 1/3] net: bridge: add helper to offload ageing time
Date
The SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME switchdev attr is actually set
when initializing a bridge port, and when configuring the bridge ageing
time from ioctl/netlink/sysfs.

Add a __set_ageing_time helper to offload the ageing time to physical
switches, and add the SWITCHDEV_F_DEFER flag since it can be called
under bridge lock.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
---
net/bridge/br_private.h | 1 +
net/bridge/br_stp.c | 28 ++++++++++++++++++++--------
net/bridge/br_stp_if.c | 12 +++---------
3 files changed, 24 insertions(+), 17 deletions(-)

diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 1b63177..3c294b4 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -992,6 +992,7 @@ void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
int br_set_forward_delay(struct net_bridge *br, unsigned long x);
int br_set_hello_time(struct net_bridge *br, unsigned long x);
int br_set_max_age(struct net_bridge *br, unsigned long x);
+int __set_ageing_time(struct net_device *dev, unsigned long t);
int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);


diff --git a/net/bridge/br_stp.c b/net/bridge/br_stp.c
index 9258b8e..6ebe2a0 100644
--- a/net/bridge/br_stp.c
+++ b/net/bridge/br_stp.c
@@ -562,6 +562,24 @@ int br_set_max_age(struct net_bridge *br, unsigned long val)

}

+/* called under bridge lock */
+int __set_ageing_time(struct net_device *dev, unsigned long t)
+{
+ struct switchdev_attr attr = {
+ .orig_dev = dev,
+ .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
+ .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
+ .u.ageing_time = jiffies_to_clock_t(t),
+ };
+ int err;
+
+ err = switchdev_port_attr_set(dev, &attr);
+ if (err && err != -EOPNOTSUPP)
+ return err;
+
+ return 0;
+}
+
/* Set time interval that dynamic forwarding entries live
* For pure software bridge, allow values outside the 802.1
* standard specification for special cases:
@@ -572,17 +590,11 @@ int br_set_max_age(struct net_bridge *br, unsigned long val)
*/
int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time)
{
- struct switchdev_attr attr = {
- .orig_dev = br->dev,
- .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
- .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP,
- .u.ageing_time = ageing_time,
- };
unsigned long t = clock_t_to_jiffies(ageing_time);
int err;

- err = switchdev_port_attr_set(br->dev, &attr);
- if (err && err != -EOPNOTSUPP)
+ err = __set_ageing_time(br->dev, t);
+ if (err)
return err;

br->ageing_time = t;
diff --git a/net/bridge/br_stp_if.c b/net/bridge/br_stp_if.c
index d8ad73b..2efbba5 100644
--- a/net/bridge/br_stp_if.c
+++ b/net/bridge/br_stp_if.c
@@ -36,12 +36,6 @@ static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
/* called under bridge lock */
void br_init_port(struct net_bridge_port *p)
{
- struct switchdev_attr attr = {
- .orig_dev = p->dev,
- .id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
- .flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
- .u.ageing_time = jiffies_to_clock_t(p->br->ageing_time),
- };
int err;

p->port_id = br_make_port_id(p->priority, p->port_no);
@@ -50,9 +44,9 @@ void br_init_port(struct net_bridge_port *p)
p->topology_change_ack = 0;
p->config_pending = 0;

- err = switchdev_port_attr_set(p->dev, &attr);
- if (err && err != -EOPNOTSUPP)
- netdev_err(p->dev, "failed to set HW ageing time\n");
+ err = __set_ageing_time(p->dev, p->br->ageing_time);
+ if (err)
+ netdev_err(p->dev, "failed to offload ageing time\n");
}

/* NO locks held */
--
2.10.2
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