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

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Message-Id: <20240215172554.4211-1-praveen.kannoju@oracle.com>
Date: Thu, 15 Feb 2024 22:55:54 +0530
From: Praveen Kumar Kannoju <praveen.kannoju@...cle.com>
To: j.vosburgh@...il.com, andy@...yhouse.net, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: rajesh.sivaramasubramaniom@...cle.com, rama.nichanamatlu@...cle.com,
        manjunath.b.patil@...cle.com,
        Praveen Kumar Kannoju <praveen.kannoju@...cle.com>
Subject: [PATCH RFC] bonding: rate-limit bonding driver inspect messages

Rate limit bond driver log messages, to prevent a log flood in a run-away
situation, e.g couldn't get rtnl lock. Message flood leads to instability
of system and loss of other crucial messages.

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

Signed-off-by: Praveen Kumar Kannoju <praveen.kannoju@...cle.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