netdev - Re: [PATCH net-next v2] net: page_pool: use in

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Date:   Fri, 3 Feb 2023 14:36:38 +0100
From:   Felix Fietkau <nbd@....name>
To:     Qingfang DENG <dqfext@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: page_pool: use in_softirq() instead

On 03.02.23 02:16, Qingfang DENG wrote:
> From: Qingfang DENG <qingfang.deng@...lower.com.cn>
> 
> We use BH context only for synchronization, so we don't care if it's
> actually serving softirq or not.
> 
> As a side node, in case of threaded NAPI, in_serving_softirq() will
> return false because it's in process context with BH off, making
> page_pool_recycle_in_cache() unreachable.
> 
> Signed-off-by: Qingfang DENG <qingfang.deng@...lower.com.cn>
Tested-by: Felix Fietkau <nbd@....name>