From: Eric Dumazet <edumazet@google.com>
To: Christian Marangi <ansuelsmth@gmail.com>
Cc: Vincent Whitchurch <vincent.whitchurch@axis.com>,
Raju Rangoju <rajur@chelsio.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>,
Jose Abreu <joabreu@synopsys.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Ping-Ke Shih <pkshih@realtek.com>, Kalle Valo <kvalo@kernel.org>,
Simon Horman <horms@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Jiri Pirko <jiri@resnulli.us>, Hangbin Liu <liuhangbin@gmail.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org,
linux-wireless@vger.kernel.org
Subject: Re: [net-next PATCH 1/3] net: introduce napi_is_scheduled helper
Date: Sat, 30 Sep 2023 13:59:53 +0200 [thread overview]
Message-ID: <CANn89iJtrpVQZbeAezd7S4p_yCRSFzcsBMgW+y9YhxOrCv463A@mail.gmail.com> (raw)
In-Reply-To: <20230922111247.497-1-ansuelsmth@gmail.com>
On Fri, Sep 22, 2023 at 1:13 PM Christian Marangi <ansuelsmth@gmail.com> wrote:
>
> 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@gmail.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);
> }
>
In which context is it safe to call this helper ?
I fear that making this available will add more bugs.
For instance rspq_check_napi() seems buggy to me.
> +static inline bool napi_is_scheduled(struct napi_struct *n)
const ...
> +{
> + 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
>
next prev parent reply other threads:[~2023-09-30 12:00 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 11:12 [net-next PATCH 1/3] net: introduce napi_is_scheduled helper Christian Marangi
2023-09-22 11:12 ` [net-next PATCH 2/3] net: stmmac: improve TX timer arm logic Christian Marangi
2023-09-29 12:38 ` Vincent Whitchurch
2023-09-30 12:04 ` Christian Marangi
2023-09-22 11:12 ` [net-next PATCH 3/3] net: stmmac: increase TX coalesce timer to 5ms Christian Marangi
2023-09-22 12:28 ` Andrew Lunn
2023-09-22 12:39 ` Christian Marangi
2023-09-22 20:02 ` Dave Taht
2023-09-29 21:03 ` [net-next PATCH 1/3] net: introduce napi_is_scheduled helper Nambiar, Amritha
2023-09-30 11:59 ` Eric Dumazet [this message]
2023-09-30 12:11 ` Christian Marangi
2023-09-30 13:42 ` Eric Dumazet
2023-10-02 12:29 ` Christian Marangi
2023-10-02 12:35 ` Eric Dumazet
2023-10-02 12:43 ` Christian Marangi
2023-10-02 12:49 ` Eric Dumazet
2023-10-02 12:54 ` Christian Marangi
2023-10-02 12:56 ` Eric Dumazet
2023-10-02 12:59 ` Eric Dumazet
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