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

Praveen Kannoju
2024-02-19T13:36:33Z

Hi,
I've forgot to remove RFC in the subject line. Will remove it and re-send another copy.

-
Praveen.
> -----Original Message-----
> From: Praveen Kumar Kannoju <praveen.kannoju@oracle.com>
> Sent: 19 February 2024 05:02 PM
> To: j.vosburgh@gmail.com; andy@greyhouse.net; davem@davemloft.net; edumazet@google.com; kuba@kernel.org;
> pabeni@redhat.com; netdev@vger.kernel.org; linux-kernel@vger.kernel.org
> Cc: Rajesh Sivaramasubramaniom <rajesh.sivaramasubramaniom@oracle.com>; Rama Nichanamatlu
> <rama.nichanamatlu@oracle.com>; Manjunath Patil <manjunath.b.patil@oracle.com>; Praveen Kannoju
> <praveen.kannoju@oracle.com>
> Subject: [PATCH RFC] bonding: rate-limit bonding driver inspect messages
>
> 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