From: Loic Poulain <loic.poulain@linaro.org>
To: haozhe.chang@mediatek.com
Cc: M Chetan Kumar <m.chetan.kumar@intel.com>,
Intel Corporation <linuxwwan@intel.com>,
Sergey Ryazanov <ryazanov.s.a@gmail.com>,
Johannes Berg <johannes@sipsolutions.net>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Stephan Gerhold <stephan@gerhold.net>,
Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>,
Chiranjeevi Rapolu <chiranjeevi.rapolu@linux.intel.com>,
Liu Haijun <haijun.liu@mediatek.com>,
Ricardo Martinez <ricardo.martinez@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
Oliver Neukum <oneukum@suse.com>,
Shang XiaoJing <shangxiaojing@huawei.com>,
"open list:INTEL WWAN IOSM DRIVER" <netdev@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
"open list:REMOTE PROCESSOR MESSAGING (RPMSG) WWAN CONTROL..."
<linux-remoteproc@vger.kernel.org>,
"open list:USB SUBSYSTEM" <linux-usb@vger.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@lists.infradead.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>,
lambert.wang@mediatek.com, xiayu.zhang@mediatek.com,
hua.yang@mediatek.com
Subject: Re: [PATCH v5] wwan: core: Support slicing in port TX flow of WWAN subsystem
Date: Thu, 1 Dec 2022 10:56:45 +0100 [thread overview]
Message-ID: <CAMZdPi9JOQpmhQepBMeG5jzncP8t5mp68O2nfSOFUUZ9e_fDsQ@mail.gmail.com> (raw)
In-Reply-To: <20221124074725.74325-1-haozhe.chang@mediatek.com>
On Thu, 24 Nov 2022 at 08:47, <haozhe.chang@mediatek.com> wrote:
>
> From: haozhe chang <haozhe.chang@mediatek.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@mediatek.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
next prev parent reply other threads:[~2022-12-01 9:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-24 7:47 [PATCH v5] wwan: core: Support slicing in port TX flow of WWAN subsystem haozhe.chang
2022-12-01 9:56 ` Loic Poulain [this message]
2022-12-14 8:25 ` Haozhe Chang (常浩哲)
2022-12-14 9:10 ` Loic Poulain
2023-03-03 8:59 ` 回复: " Haozhe Chang (常浩哲)
2023-03-06 16:00 ` Loic Poulain
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