[PATCH net-next v5] bonding: rate-limit bonding driver inspect messages

[Praveen Kumar Kannoju]

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.

Signed-off-by: Praveen Kumar Kannoju <praveen.kannoju@xxxxxxxxxx>
---
v5:
  - Redundant indentation addressed.
v4: https://lore.kernel.org/all/20240220050437.5623-1-praveen.kannoju@xxxxxxxxxx/
  - Rectification in the patch subject and versioning details.
v3: https://lore.kernel.org/lkml/20240219133721.4567-1-praveen.kannoju@xxxxxxxxxx/
  - Commit message is modified to provide summary of the issue, because of
    which rate-limiting the bonding driver messages is needed.
v2: https://lore.kernel.org/lkml/20240215172554.4211-1-praveen.kannoju@xxxxxxxxxx/
  - Use exising net_ratelimit() instead of introducing new rate-limit
    parameter.
v1: https://lore.kernel.org/lkml/20240214044245.33170-1-praveen.kannoju@xxxxxxxxxx/
---
 drivers/net/bonding/bond_main.c | 24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 4e0600c..c8482cd 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2609,12 +2609,12 @@ static int bond_miimon_inspect(struct bonding *bond)
 			bond_propose_link_state(slave, BOND_LINK_FAIL);
 			commit++;
 			slave->delay = bond->params.downdelay;
-			if (slave->delay) {
+			if (slave->delay && 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_MODE_ACTIVEBACKUP) ?
+					   (bond_is_active_slave(slave) ?
+					   "active " : "backup ") : "",
 					   bond->params.downdelay * bond->params.miimon);
 			}
 			fallthrough;
@@ -2623,9 +2623,10 @@ 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;
 			}
@@ -2647,7 +2648,7 @@ static int bond_miimon_inspect(struct bonding *bond)
 			commit++;
 			slave->delay = bond->params.updelay;
 
-			if (slave->delay) {
+			if (slave->delay && net_ratelimit()) {
 				slave_info(bond->dev, slave->dev, "link status up, enabling it in %d ms\n",
 					   ignore_updelay ? 0 :
 					   bond->params.updelay *
@@ -2657,9 +2658,10 @@ static int bond_miimon_inspect(struct bonding *bond)
 		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