[PATCH RESEND net-next] wwan: core: Support slicing in port TX flow of WWAN subsystem
Simon Horman
simon.horman at corigine.com
Tue Mar 7 07:37:31 PST 2023
On Tue, Mar 07, 2023 at 04:11:04PM +0800, haozhe.chang at mediatek.com wrote:
> From: haozhe chang <haozhe.chang at 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 at mediatek.com>
> Reviewed-by: Loic Poulain <loic.poulain at linaro.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).
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