netdev - Re: [PATCH net-next v3 4/4] netdevsim: account dropped packet length in stats on queue free

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Message-ID: <20250617055934.3fd9d322@kernel.org>
Date: Tue, 17 Jun 2025 05:59:34 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Paolo Abeni
 <pabeni@...hat.com>, David Wei <dw@...idwei.uk>, Shuah Khan
 <shuah@...nel.org>, Simon Horman <horms@...nel.org>,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, gustavold@...il.com
Subject: Re: [PATCH net-next v3 4/4] netdevsim: account dropped packet
 length in stats on queue free

On Tue, 17 Jun 2025 01:19:00 -0700 Breno Leitao wrote:
> -static void nsim_queue_free(struct nsim_rq *rq)
> +static void nsim_queue_free(struct net_device *dev, struct nsim_rq *rq)
>  {
>  	hrtimer_cancel(&rq->napi_timer);
> +	dev_dstats_rx_dropped_add(dev, rq->skb_queue.qlen);

here we are in process context and debug checks complain about the use
of this_cpu_ptr(). Let's wrap this in local_bh_disable() / enable() ?

>  	skb_queue_purge_reason(&rq->skb_queue, SKB_DROP_REASON_QUEUE_PURGE);
>  	kfree(rq);
>  }
-- 
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