linux-kernel - Re: [PATCH v5] wwan: core: Support slicing in port TX flow of WWAN subsystem

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Date:   Thu, 1 Dec 2022 10:56:45 +0100
From:   Loic Poulain <loic.poulain@...aro.org>
To:     haozhe.chang@...iatek.com
Cc:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Chandrashekar Devegowda <chandrashekar.devegowda@...el.com>,
        Chiranjeevi Rapolu <chiranjeevi.rapolu@...ux.intel.com>,
        Liu Haijun <haijun.liu@...iatek.com>,
        Ricardo Martinez <ricardo.martinez@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Oliver Neukum <oneukum@...e.com>,
        Shang XiaoJing <shangxiaojing@...wei.com>,
        "open list:INTEL WWAN IOSM DRIVER" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:REMOTE PROCESSOR MESSAGING (RPMSG) WWAN CONTROL..." 
        <linux-remoteproc@...r.kernel.org>,
        "open list:USB SUBSYSTEM" <linux-usb@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>, lambert.wang@...iatek.com,
        xiayu.zhang@...iatek.com, hua.yang@...iatek.com
Subject: Re: [PATCH v5] wwan: core: Support slicing in port TX flow of WWAN subsystem

On Thu, 24 Nov 2022 at 08:47, <haozhe.chang@...iatek.com> wrote:
>
> From: haozhe chang <haozhe.chang@...iatek.com>
>
> wwan_port_fops_write inputs the SKB parameter to the TX callback of
> the WWAN device driver. However, the WWAN device (e.g., t7xx) may
> have an MTU less than the size of SKB, causing the TX buffer to be
> sliced and copied once more in the WWAN device driver.
>
> This patch implements the slicing in the WWAN subsystem and gives
> the WWAN devices driver the option to slice(by frag_len) or not. By
> doing so, the additional memory copy is reduced.
>
> Meanwhile, this patch gives WWAN devices driver the option to reserve
> headroom in fragments for the device-specific metadata.
>
> Signed-off-by: haozhe chang <haozhe.chang@...iatek.com>

Reviewed-by: Loic Poulain <loic.poulain@...aro.org>