netdev - Re: [PATCH 3/3] net/mlx5e: don't build RFS without ethernet

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Date:	Wed, 4 May 2016 17:55:20 +0300
From:	Saeed Mahameed <saeedm@....mellanox.co.il>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Matan Barak <matanb@...lanox.com>,
	Leon Romanovsky <leonro@...lanox.com>,
	Saeed Mahameed <saeedm@...lanox.com>,
	Linux Netdev List <netdev@...r.kernel.org>,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Matthew Finlay <matt@...lanox.com>,
	Richard Cochran <richardcochran@...il.com>,
	Amir Vadai <amirv@...lanox.com>,
	Haggai Abramonvsky <hagaya@...lanox.com>,
	Maor Gottlieb <maorg@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Majd Dibbiny <majd@...lanox.com>
Subject: Re: [PATCH 3/3] net/mlx5e: don't build RFS without ethernet

On Wed, May 4, 2016 at 5:23 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Wednesday 04 May 2016 16:09:16 Saeed Mahameed wrote:
>> On Wed, May 4, 2016 at 3:32 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> > The RFS acceleration support in mlx5 is enabled whenever CONFIG_RFS_ACCEL
>> > is in use. However, this fails if a user turns off CONFIG_MLX5_CORE_EN,
>> > because the rfs code now calls into the ethernet portion of the
>> > driver:
>> >
>> > ERROR: "mlx5e_destroy_flow_table" [drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.ko] undefined!
>> >
>>
>> Hi Arnd,
>>
>> We already posted a fix for this, please see "[PATCH net-next V1
>> 01/12] net/mlx5e: Fix aRFS compilation dependency", and give us your
>> feedback.
>
> That version looks fine as well. I think it's better to be a little
> more explicit as I was, but either way seems fine.
>

Simply we didn't want to add new Kconfig flag.

>
> You can also achieve the same thing in yet another way using Makefile
> syntax instead of cpp or Kconfig:
>
> ifdef CONFIG_MLX5_CORE_EN
> mlx5_core-y += wq.o eswitch.o \
>                en_main.o en_fs.o en_ethtool.o en_tx.o en_rx.o \
>                en_txrx.o en_clock.o vxlan.o en_tc.o
>                en_txrx.o en_clock.o vxlan.o en_tc.o en_arfs.o
>
> mlx5_core-$(CONFIG_RFS_ACCEL) += en_arfs.o
> endif
>
>
> If you prefer Maor's version, feel free to add
>
>
> Acked-by: Arnd Bergmann <arnd@...db.de>
>

I do prefer this version, but the difference is small, so will keep Maor's.
Thanks Arnd for the Ack and the suggestion.

Saeed.