linux-kernel - Re: [PATCH v2] IB/hfi1: allocate dummy net

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Message-ID: <20240313104252.GA12921@unreal>
Date: Wed, 13 Mar 2024 12:42:52 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Breno Leitao <leitao@...ian.org>
Cc: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
	Jason Gunthorpe <jgg@...pe.ca>, kuba@...nel.org,
	keescook@...omium.org,
	"open list:HFI1 DRIVER" <linux-rdma@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] IB/hfi1: allocate dummy net_device dynamically

On Wed, Mar 13, 2024 at 03:33:10AM -0700, Breno Leitao wrote:
> struct net_device shouldn't be embedded into any structure, instead,
> the owner should use the priv space to embed their state into net_device.

"shouldn't" is a strong word, given the fact that original init_dummy_netdev()
was designed to be used in such way.

> 
> 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_device from struct hfi1_netdev_rx by converting it
> into a pointer. Then use the leverage alloc_netdev() to allocate the
> net_device object at hfi1_alloc_rx().
> 
> [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/
> 
> Signed-off-by: Breno Leitao <leitao@...ian.org>
> 
> ----
> PS: this diff needs d160c66cda0ac8614 ("net: Do not return value from
> init_dummy_netdev()") in order to apply and build cleanly.

We are in merge window now, so if Dennis approves, I will apply it after the merge window

Thanks