netdev - Re: [PATCH] wifi: mt76: un-embedd netdev from mt76

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Date: Mon, 17 Jun 2024 02:22:23 -0700
From: Breno Leitao <leitao@...ian.org>
To: Kalle Valo <kvalo@...nel.org>
Cc: linux-wireless@...r.kernel.org, Felix Fietkau <nbd@....name>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Ryder Lee <ryder.lee@...iatek.com>,
	Shayne Chen <shayne.chen@...iatek.com>,
	Sean Wang <sean.wang@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	netdev@...r.kernel.org, horms@...nel.org, kees@...nel.org,
	kuba@...nel.org, Bo Jiao <Bo.Jiao@...iatek.com>,
	Daniel Golle <daniel@...rotopia.org>,
	Alexander Couzens <lynxis@...0.eu>,
	Deren Wu <deren.wu@...iatek.com>,
	Ming Yen Hsieh <mingyen.hsieh@...iatek.com>,
	Leon Yen <leon.yen@...iatek.com>,
	Quan Zhou <quan.zhou@...iatek.com>, Ingo Rohloff <lundril@....de>,
	Sujuan Chen <sujuan.chen@...iatek.com>,
	StanleyYP Wang <StanleyYP.Wang@...iatek.com>,
	Benjamin Lin <benjamin-jw.lin@...iatek.com>,
	Peter Chiu <chui-hao.chiu@...iatek.com>,
	"open list:ARM/Mediatek SoC support" <linux-kernel@...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>
Subject: Re: [PATCH] wifi: mt76: un-embedd netdev from mt76_dev

Hello Kalle,

On Mon, Jun 17, 2024 at 12:03:49PM +0300, Kalle Valo wrote:
> Breno Leitao <leitao@...ian.org> writes:
> 
> > Embedding net_device into structures prohibits the usage of flexible
> > arrays in the net_device structure. For more details, see the discussion
> > at [1].
> >
> > Un-embed the net_devices from struct mt76_dev by converting them
> > into pointers, and allocating them dynamically. Use the leverage
> > alloc_netdev_dummy() to allocate the net_device object at
> > mt76_dma_init().
> >
> > The free of the device occurs at mt76_dma_cleanup().
> >
> > Link: https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ [1]
> > Signed-off-by: Breno Leitao <leitao@...ian.org>
> > ---
> >
> > PS: Due to the lack of hardware, this patch was not tested on a real
> > hardware, unfortunately.
> >
> > PS2: this is the last driver that is still using embedded netdevices.
> 
> Is this patch a dependency to other patches? I'm asking because it will
> be _slow_ to get this patch to net-next via wireless trees. If there's
> urgency then it's much better to take it directly to net-next (of course
> with acks from Felix and Lorenzo).

Since this is the last patch for the whole flexible netdev work, I would
prefer to have it through net-next then, so, we finish the whole work
sooner rather than later.

I will prepare a v2 with Simon's suggestion, and I can target net-next.
I am just waiting a bit more to hear from Felix and Lorenzo.

Thanks!