linux-kernel - Re: [PATCH] bnx2x: add a separate GENEVE Kconfig symbol

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Message-ID: <CO2PR11MB0088CC09F328C0CFE10187BF97A40@CO2PR11MB0088.namprd11.prod.outlook.com>
Date:	Tue, 23 Feb 2016 18:33:10 +0000
From:	Yuval Mintz <Yuval.Mintz@...gic.com>
To:	Arnd Bergmann <arnd@...db.de>, Ariel Elior <Ariel.Elior@...gic.com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] bnx2x: add a separate GENEVE Kconfig symbol

> When CONFIG_GENEVE is built as a loadable module, and bnx2x is built-in,
> we get this link error:

> drivers/net/built-in.o: In function `bnx2x_open':
> :(.text+0x33322): undefined reference to `geneve_get_rx_port'
> drivers/net/built-in.o: In function `bnx2x_sp_rtnl_task':
> :(.text+0x3e632): undefined reference to `geneve_get_rx_port'

> This avoids the problem by adding a separate Kconfig symbol named
> CONFIG_BNX2X_GENEVE that is only enabled when the code is
> reachable from the driver.

> This is the same trick that BNX2X does for VXLAN support, and
> is similar to how I40E handles both.

> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: 883ce97d25b0 ("bnx2x: Add Geneve inner-RSS support")

Ouch. Thanks for fixing this one; I tried avoiding this solution
since I don't think there's any reason to encumber the config
file with needless options [I.e., what's the gain in the ability to
disable a single offloaded protocol on a single network driver?],
but obviously, I botched the job.

BTW, if you want to handle this exactly like vxlan, you might
consider using `defined(CONFIG_BNX2X_GENEVE)' instead of
`IS_ENABLED(CONFIG_BNX2X_GENEVE)'  [It not a tristate].
But that's truly insignificant.

Acked-By: Yuval Mintz <Yuval.Mintz@...gic.com>