linux-kernel - Re: [patch V2 26/36] net: brcmfmac: Convey execution context via argument to brcmf_netif

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Message-ID: <0f26e8be-bfb1-7e69-3a8d-a5ef2bf22b25@broadcom.com>
Date:   Wed, 30 Sep 2020 00:03:59 +0200
From:   Arend Van Spriel <arend.vanspriel@...adcom.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Paul McKenney <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christian Benvenuti <benve@...co.com>,
        Govindarajulu Varadarajan <_govind@....com>,
        Dave Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Jonathan Corbet <corbet@....net>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-doc@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Jay Cliburn <jcliburn@...il.com>,
        Chris Snook <chris.snook@...il.com>,
        Vishal Kulkarni <vishal@...lsio.com>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        intel-wired-lan@...ts.osuosl.org,
        Shannon Nelson <snelson@...sando.io>,
        Pensando Drivers <drivers@...sando.io>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
        Edward Cree <ecree@...arflare.com>,
        Martin Habets <mhabets@...arflare.com>,
        Jon Mason <jdmason@...zu.us>, Daniel Drake <dsd@...too.org>,
        Ulrich Kunitz <kune@...ne-taler.de>,
        Kalle Valo <kvalo@...eaurora.org>,
        linux-wireless@...r.kernel.org, linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Wright Feng <wright.feng@...ress.com>,
        brcm80211-dev-list.pdl@...adcom.com,
        brcm80211-dev-list@...ress.com,
        Stanislav Yakovlev <stas.yakovlev@...il.com>,
        Stanislaw Gruszka <stf_xl@...pl>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Intel Linux Wireless <linuxwifi@...el.com>,
        Jouni Malinen <j@...fi>,
        Amitkumar Karwar <amitkarwar@...il.com>,
        Ganapathi Bhat <ganapathi.bhat@....com>,
        Xinming Hu <huxinming820@...il.com>,
        libertas-dev@...ts.infradead.org,
        Pascal Terjan <pterjan@...gle.com>,
        Ping-Ke Shih <pkshih@...ltek.com>
Subject: Re: [patch V2 26/36] net: brcmfmac: Convey execution context via
 argument to brcmf_netif_rx()

On 9/29/2020 10:25 PM, Thomas Gleixner wrote:
> bcrmgf_netif_rx() uses in_interrupt to chose between netif_rx() and
> netif_rx_ni(). in_interrupt() usage in drivers is phased out.
> 
> Convey the execution mode via an 'inirq' argument through the various
> callchains leading to brcmf_netif_rx():
> 
> brcmf_pcie_isr_thread()		    <- Task context
>    brcmf_proto_msgbuf_rx_trigger()
>      brcmf_msgbuf_process_rx()
>        brcmf_msgbuf_process_msgtype()
>          brcmf_msgbuf_process_rx_complete()
> 	  brcmf_netif_mon_rx()
> 	     brcmf_netif_rx(isirq = false)
> 	  brcmf_netif_rx(isirq = false)
> 
> brcmf_sdio_readframes()  <- Task context sdio_claim_host() might sleep
>    brcmf_rx_frame(isirq = false)
> 
> brcmf_sdio_rxglom()      <- Task context sdio_claim_host() might sleep
>    brcmf_rx_frame(isirq = false)
> 
> brcmf_usb_rx_complete()  <- Interrupt context
>    brcmf_rx_frame(isirq = true)
> 
> brcmf_rx_frame()
>    brcmf_proto_rxreorder()
>      brcmf_proto_bcdc_rxreorder()
>        brcmf_fws_rxreorder()
>          brcmf_netif_rx()
>        brcmf_netif_rx()

Thanks for taking the dive.

Reviewed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Arend van Spriel <arend.vanspriel@...adcom.com>
> Cc: Kalle Valo <kvalo@...eaurora.org>
> ---
> V2: New patch. Using an argument instead of switching to netif_rx_any_context()
> ---
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcdc.c     |    4 +--
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/bus.h      |    3 +-
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.c     |   16 ++++++------
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/core.h     |    2 -
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.c |   10 +++----
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwsignal.h |    2 -
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/msgbuf.c   |    5 ++-
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/proto.h    |    6 ++--
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c     |    4 +--
>   drivers/net/wireless/broadcom/brcm80211/brcmfmac/usb.c      |    2 -
>   10 files changed, 29 insertions(+), 25 deletions(-)

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