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

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Message-ID: <49973089-1e5e-48a2-9616-09cf8b8d5a7f@cornelisnetworks.com>
Date: Tue, 30 Apr 2024 10:03:49 -0400
From: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
To: Leon Romanovsky <leon@...nel.org>, Breno Leitao <leitao@...ian.org>,
 kuba@...nel.org
Cc: Jason Gunthorpe <jgg@...pe.ca>,
 "open list:HFI1 DRIVER" <linux-rdma@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>,
 linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] IB/hfi1: allocate dummy net_device dynamically

On 4/30/24 8:50 AM, Leon Romanovsky wrote:
> On Fri, Apr 26, 2024 at 01:56:05AM -0700, Breno Leitao wrote:
>> 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/
>>
>> Acked-by: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
>> Signed-off-by: Breno Leitao <leitao@...ian.org>
>> ---
>> Changelog
>>
>> v5:
>> 	* Basically replaced the old alloc_netdev() by the new helper
>> 	  alloc_netdev_dummy().
>> v4:
>> 	* Fix the changelog format
>> v3:
>> 	* Re-worded the comment, by removing the first paragraph.
>> v2:
>> 	* Free struct hfi1_netdev_rx allocation if alloc_netdev() fails
>> 	* Pass zero as the private size for alloc_netdev().
>> 	* Remove wrong reference for iwl in the comments
>> ---
>>
>>  drivers/infiniband/hw/hfi1/netdev.h    | 2 +-
>>  drivers/infiniband/hw/hfi1/netdev_rx.c | 9 +++++++--
>>  2 files changed, 8 insertions(+), 3 deletions(-)
> 
> Dennis,
> 
> Do you plan to send anything to rdma-next which can potentially create
> conflicts with netdev in this cycle?
> 
> If not, it will be safe to apply this patch directly to net-next.
> 
> Thanks

Nothing right now. Should be safe to sent to net-next.

FYI, since I talked about it publicly at the OFA Workshop recently. We will be
starting the upstream of support for our new HW, soon.

-Denny