linux-kernel - RE: [net-next PATCH 1/3] net: introduce napi_is

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Date:   Fri, 29 Sep 2023 21:03:18 +0000
From:   "Nambiar, Amritha" <amritha.nambiar@...el.com>
To:     Christian Marangi <ansuelsmth@...il.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Raju Rangoju <rajur@...lsio.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        "Jakub Kicinski" <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Alexandre Torgue" <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Kalle Valo <kvalo@...nel.org>, Simon Horman <horms@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Jiri Pirko <jiri@...nulli.us>,
        Hangbin Liu <liuhangbin@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: RE: [net-next PATCH 1/3] net: introduce napi_is_scheduled helper

> -----Original Message-----
> From: Christian Marangi <ansuelsmth@...il.com>
> Sent: Friday, September 22, 2023 4:13 AM
> To: Vincent Whitchurch <vincent.whitchurch@...s.com>; Raju Rangoju
> <rajur@...lsio.com>; David S. Miller <davem@...emloft.net>; Eric Dumazet
> <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni
> <pabeni@...hat.com>; Alexandre Torgue <alexandre.torgue@...s.st.com>;
> Jose Abreu <joabreu@...opsys.com>; Maxime Coquelin
> <mcoquelin.stm32@...il.com>; Ping-Ke Shih <pkshih@...ltek.com>; Kalle
> Valo <kvalo@...nel.org>; Simon Horman <horms@...nel.org>; Daniel
> Borkmann <daniel@...earbox.net>; Jiri Pirko <jiri@...nulli.us>; Hangbin Liu
> <liuhangbin@...il.com>; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-stm32@...md-mailman.stormreply.com; linux-
> arm-kernel@...ts.infradead.org; linux-wireless@...r.kernel.org
> Cc: Christian Marangi <ansuelsmth@...il.com>
> Subject: [net-next PATCH 1/3] net: introduce napi_is_scheduled helper
> 
> We currently have napi_if_scheduled_mark_missed that can be used to
> check if napi is scheduled but that does more thing than simply checking
> it and return a bool. Some driver already implement custom function to
> check if napi is scheduled.
> 
> Drop these custom function and introduce napi_is_scheduled that simply
> check if napi is scheduled atomically.
> 
> Update any driver and code that implement a similar check and instead
> use this new helper.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

Looks good to me.
Reviewed-by: Amritha Nambiar <amritha.nambiar@...el.com>

> ---
>  drivers/net/ethernet/chelsio/cxgb3/sge.c  | 8 --------
>  drivers/net/wireless/realtek/rtw89/core.c | 2 +-
>  include/linux/netdevice.h                 | 5 +++++
>  net/core/dev.c                            | 2 +-
>  4 files changed, 7 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/chelsio/cxgb3/sge.c
> b/drivers/net/ethernet/chelsio/cxgb3/sge.c
> index 2e9a74fe0970..71fa2dc19034 100644
> --- a/drivers/net/ethernet/chelsio/cxgb3/sge.c
> +++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c
> @@ -2501,14 +2501,6 @@ static int napi_rx_handler(struct napi_struct *napi,
> int budget)
>  	return work_done;
>  }
> 
> -/*
> - * Returns true if the device is already scheduled for polling.
> - */
> -static inline int napi_is_scheduled(struct napi_struct *napi)
> -{
> -	return test_bit(NAPI_STATE_SCHED, &napi->state);
> -}
> -
>  /**
>   *	process_pure_responses - process pure responses from a response
> queue
>   *	@adap: the adapter
> diff --git a/drivers/net/wireless/realtek/rtw89/core.c
> b/drivers/net/wireless/realtek/rtw89/core.c
> index 133bf289bacb..bbf4ea3639d4 100644
> --- a/drivers/net/wireless/realtek/rtw89/core.c
> +++ b/drivers/net/wireless/realtek/rtw89/core.c
> @@ -1744,7 +1744,7 @@ static void rtw89_core_rx_to_mac80211(struct
> rtw89_dev *rtwdev,
>  	struct napi_struct *napi = &rtwdev->napi;
> 
>  	/* In low power mode, napi isn't scheduled. Receive it to netif. */
> -	if (unlikely(!test_bit(NAPI_STATE_SCHED, &napi->state)))
> +	if (unlikely(!napi_is_scheduled(napi)))
>  		napi = NULL;
> 
>  	rtw89_core_hw_to_sband_rate(rx_status);
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index db3d8429d50d..8eac00cd3b92 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -482,6 +482,11 @@ static inline bool napi_prefer_busy_poll(struct
> napi_struct *n)
>  	return test_bit(NAPI_STATE_PREFER_BUSY_POLL, &n->state);
>  }
> 
> +static inline bool napi_is_scheduled(struct napi_struct *n)
> +{
> +	return test_bit(NAPI_STATE_SCHED, &n->state);
> +}
> +
>  bool napi_schedule_prep(struct napi_struct *n);
> 
>  /**
> diff --git a/net/core/dev.c b/net/core/dev.c
> index cc03a5758d2d..32ba8002f65a 100644
> --- a/net/core/dev.c
> +++ b/net/core/dev.c
> @@ -6523,7 +6523,7 @@ static int __napi_poll(struct napi_struct *n, bool
> *repoll)
>  	 * accidentally calling ->poll() when NAPI is not scheduled.
>  	 */
>  	work = 0;
> -	if (test_bit(NAPI_STATE_SCHED, &n->state)) {
> +	if (napi_is_scheduled(n)) {
>  		work = n->poll(n, weight);
>  		trace_napi_poll(n, work, weight);
>  	}
> --
> 2.40.1
>