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

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Date: Mon, 11 Mar 2024 14:17:13 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
Cc: Breno Leitao <leitao@...ian.org>, 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 net-next] IB/hfi1: allocate dummy net_device dynamically

On Mon, Mar 11, 2024 at 08:05:45AM -0400, Dennis Dalessandro wrote:
> On 3/8/24 1:29 PM, 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.
> > 
> > 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 iwl_trans_pcie by converting it
> > into a pointer. Then use the leverage alloc_netdev() to allocate the
> > net_device object at iwl_trans_pcie_alloc.
> 
> What does an Omni-Path Architecture driver from Cornelis Networks have to do
> with an Intel wireless driver?
> 
> > The private data of net_device becomes a pointer for the struct
> > iwl_trans_pcie, so, it is easy to get back to the iwl_trans_pcie parent
> > given the net_device object.
> > 
> > [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/
> > 
> > Signed-off-by: Breno Leitao <leitao@...ian.org>
> > ---
> >  drivers/infiniband/hw/hfi1/netdev.h    | 2 +-
> >  drivers/infiniband/hw/hfi1/netdev_rx.c | 9 +++++++--
> >  2 files changed, 8 insertions(+), 3 deletions(-)

<...>

> 
> Leon, please don't accept this until the author resubmits a patch that I either
> Ack or Test.

Sure, I will wait for your response.

Thanks

> 
> Thanks
> 
> -Denny