The netdevsim driver was getting NOHZ tick-stop errors during packet
transmission due to pending softirq work when calling napi_schedule().
This is showing the following message when running netconsole selftest.
NOHZ tick-stop error: local softirq work is pending, handler #08!!!
Add local_bh_disable()/enable() around the napi_schedule() call to
prevent softirqs from being handled during this xmit.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 3762ec05a9fb ("netdevsim: add NAPI support")
Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
drivers/net/netdevsim/netdev.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 42f247cbdceecbadf27f7090c030aa5bd240c18a..6aeb081b06da226ab91c49f53d08f465570877ae 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -87,7 +87,9 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (unlikely(nsim_forward_skb(peer_dev, skb, rq) == NET_RX_DROP))
goto out_drop_cnt;
+ local_bh_disable();
napi_schedule(&rq->napi);
+ local_bh_enable();
rcu_read_unlock();
u64_stats_update_begin(&ns->syncp);
---
base-commit: cf33d96f50903214226b379b3f10d1f262dae018
change-id: 20250212-netdevsim-258d2d628175
Best regards,
--
Breno Leitao <leitao@xxxxxxxxxx>
