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dql: Fix dql->limit value when reset.

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[ Upstream commit 3a17f23f7c ]

Executing dql_reset after setting a non-zero value for limit_min can
lead to an unreasonable situation where dql->limit is less than
dql->limit_min.

For instance, after setting
/sys/class/net/eth*/queues/tx-0/byte_queue_limits/limit_min,
an ifconfig down/up operation might cause the ethernet driver to call
netdev_tx_reset_queue, which in turn invokes dql_reset.

In this case, dql->limit is reset to 0 while dql->limit_min remains
non-zero value, which is unexpected. The limit should always be
greater than or equal to limit_min.

Signed-off-by: Jing Su <jingsusu@didiglobal.com>
Link: https://patch.msgid.link/Z9qHD1s/NEuQBdgH@pilot-ThinkCentre-M930t-N000
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jing Su 2025-03-19 16:57:51 +08:00 committed by Greg Kroah-Hartman
parent 897a205ffc
commit 0a474eaf35
1 changed files with 1 additions and 1 deletions
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2
lib/dynamic_queue_limits.c
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@ -116,7 +116,7 @@ EXPORT_SYMBOL(dql_completed);
void dql_reset(struct dql *dql)
{
/* Reset all dynamic values */
dql->limit = 0;
dql->limit = dql->min_limit;
dql->num_queued = 0;
dql->num_completed = 0;
dql->last_obj_cnt = 0;