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

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Date:   Tue, 7 Mar 2023 16:37:31 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     haozhe.chang@...iatek.com
Cc:     M Chetan Kumar <m.chetan.kumar@...el.com>,
        Intel Corporation <linuxwwan@...el.com>,
        Loic Poulain <loic.poulain@...aro.org>,
        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 RESEND net-next] wwan: core: Support slicing in port TX
 flow of WWAN subsystem

On Tue, Mar 07, 2023 at 04:11:04PM +0800, 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>
> 
> ---
> Changes in v2
>   -send fragments to device driver by skb frag_list.
> 
> Changes in v3
>   -move frag_len and headroom_len setting to wwan_create_port.
> 
> Changes in v4
>   -change unreadable parameters to macro definition.
> 
> Changes in v5
>   -optimize comments for WWAN_NO_HEADROOM, WWAN_NO_FRAGMENT.
> 
> Changes in v6
>   -add reviewer to patch commit.

Thanks for resending.

Perhaps I am missing something terribly obvious,
but this patch does not seem to apply against net-next (anymore?).

I think it would be best to rebase and post a v7.

Also, the version was missing from the patch subject (but present in v5).