[PATCH RFC] bonding: rate-limit bonding driver inspect messages

Praveen Kumar Kannoju
2024-02-19T11:32:14Z

Through the routine bond_mii_monitor(), bonding driver inspects and commits the
slave state changes. During the times when slave state change and failure in
aqcuiring rtnl lock happen at the same time, the routine bond_mii_monitor()
reschedules itself to come around after 1 msec to commit the new state.

During this, it executes the routine bond_miimon_inspect() to re-inspect the
state chane and prints the corresponding slave state on to the console. Hence
we do see a message at every 1 msec till the rtnl lock is acquired and state
chage is committed.

This patch doesn't change how bond functions. It only simply limits this kind
of log flood.

v2: Use exising net_ratelimit() instead of introducing new rate-limit
parameter.

v3: Commit message is modified to provide summary of the issue, because of
which rate-limiting the bonding driver messages is needed.

Signed-off-by: Praveen Kumar Kannoju <praveen.kannoju@oracle.com>
---
drivers/net/bonding/bond_main.c | 36 ++++++++++++++++++++----------------
1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 4e0600c..e92eba1 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2610,12 +2610,13 @@ static int bond_miimon_inspect(struct bonding *bond)
commit++;
slave->delay = bond->params.downdelay;
if (slave->delay) {
- slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
- (BOND_MODE(bond) ==
- BOND_MODE_ACTIVEBACKUP) ?
- (bond_is_active_slave(slave) ?
- "active " : "backup ") : "",
- bond->params.downdelay * bond->params.miimon);
+ if (net_ratelimit())
+ slave_info(bond->dev, slave->dev, "link status down for %sinterface, disabling it in %d ms\n",
+ (BOND_MODE(bond) ==
+ BOND_MODE_ACTIVEBACKUP) ?
+ (bond_is_active_slave(slave) ?
+ "active " : "backup ") : "",
+ bond->params.downdelay * bond->params.miimon);
}
fallthrough;
case BOND_LINK_FAIL:
@@ -2623,9 +2624,10 @@ static int bond_miimon_inspect(struct bonding *bond)
/* recovered before downdelay expired */
bond_propose_link_state(slave, BOND_LINK_UP);
slave->last_link_up = jiffies;
- slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
- (bond->params.downdelay - slave->delay) *
- bond->params.miimon);
+ if (net_ratelimit())
+ slave_info(bond->dev, slave->dev, "link status up again after %d ms\n",
+ (bond->params.downdelay - slave->delay) *
+ bond->params.miimon);
commit++;
continue;
}
@@ -2648,18 +2650,20 @@ static int bond_miimon_inspect(struct bonding *bond)
slave->delay = bond->params.updelay;

if (slave->delay) {
- slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
- ignore_updelay ? 0 :
- bond->params.updelay *
- bond->params.miimon);
+ if (net_ratelimit())
+ slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
+ ignore_updelay ? 0 :
+ bond->params.updelay *
+ bond->params.miimon);
}
fallthrough;
case BOND_LINK_BACK:
if (!link_state) {
bond_propose_link_state(slave, BOND_LINK_DOWN);
- slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
- (bond->params.updelay - slave->delay) *
- bond->params.miimon);
+ if (net_ratelimit())
+ slave_info(bond->dev, slave->dev, "link status down again after %d ms\n",
+ (bond->params.updelay - slave->delay) *
+ bond->params.miimon);
commit++;
continue;
}
--
1.8.3.1