netdev - Re: [PATCH 1/1 iwl-net] idpf: disable local BH when scheduling napi for marker packets

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Date: Fri, 9 Feb 2024 10:34:20 +0000
From: Simon Horman <horms@...nel.org>
To: Alan Brady <alan.brady@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	Emil Tantilov <emil.s.tantilov@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: Re: [PATCH 1/1 iwl-net] idpf: disable local BH when scheduling napi
 for marker packets

On Wed, Feb 07, 2024 at 04:42:43PM -0800, Alan Brady wrote:
> From: Emil Tantilov <emil.s.tantilov@...el.com>
> 
> Fix softirq's not being handled during napi_schedule() call when
> receiving marker packets for queue disable by disabling local bottom
> half.
> 
> The issue can be seen on ifdown:
> NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!!
> 
> Using ftrace to catch the failing scenario:
> ifconfig   [003] d.... 22739.830624: softirq_raise: vec=3 [action=NET_RX]
> <idle>-0   [003] ..s.. 22739.831357: softirq_entry: vec=3 [action=NET_RX]
> 
> No interrupt and CPU is idle.
> 
> After the patch, with BH locks:
> ifconfig   [003] d.... 22993.928336: softirq_raise: vec=3 [action=NET_RX]
> ifconfig   [003] ..s1. 22993.928337: softirq_entry: vec=3 [action=NET_RX]
> 
> Fixes: c2d548cad150 ("idpf: add TX splitq napi poll support")
> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Emil Tantilov <emil.s.tantilov@...el.com>
> Signed-off-by: Alan Brady <alan.brady@...el.com>

Reviewed-by: Simon Horman <horms@...nel.org>