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

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Message-Id: <20160224.224920.1224016653458748974.davem@davemloft.net>
Date:	Wed, 24 Feb 2016 22:49:20 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	Yuval.Mintz@...gic.com
Cc:	arnd@...db.de, Ariel.Elior@...gic.com,
	linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bnx2x: add a separate GENEVE Kconfig symbol

From: Yuval Mintz <Yuval.Mintz@...gic.com>
Date: Tue, 23 Feb 2016 18:33:10 +0000

>> 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>

Applied, thanks everyone.