linux-kernel - Re: [PATCH] bnxt: fix building without CONFIG_RFS

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Date: Wed, 03 Jan 2024 17:01:35 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andy Gospodarek" <andrew.gospodarek@...adcom.com>,
 "Arnd Bergmann" <arnd@...nel.org>
Cc: "Michael Chan" <michael.chan@...adcom.com>,
 "David S . Miller" <davem@...emloft.net>,
 "Eric Dumazet" <edumazet@...gle.com>, "Jakub Kicinski" <kuba@...nel.org>,
 "Paolo Abeni" <pabeni@...hat.com>,
 "Pavan Chebbi" <pavan.chebbi@...adcom.com>,
 "Somnath Kotur" <somnath.kotur@...adcom.com>,
 "Kalesh AP" <kalesh-anakkur.purayil@...adcom.com>,
 "Randy Schacher" <stuart.schacher@...adcom.com>,
 "Vasundhara Volam" <vasundhara-v.volam@...adcom.com>,
 Netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bnxt: fix building without CONFIG_RFS_ACCEL

On Wed, Jan 3, 2024, at 16:46, Andy Gospodarek wrote:
> On Wed, Jan 03, 2024 at 11:23:11AM +0100, Arnd Bergmann wrote:
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> A recent patch series generalized the filter logic in bnxt to no
>> longer just be used for RFS, but it now fails to build when RFS_ACCEL
>> is disabled:
>> 
>> drivers/net/ethernet/broadcom/bnxt/bnxt.c: In function 'bnxt_cfg_ntp_filters':
>> drivers/net/ethernet/broadcom/bnxt/bnxt.c:14077:37: error: implicit declaration of function 'rps_may_expire_flow' [-Werror=implicit-function-declaration]
>> 14077 |                                 if (rps_may_expire_flow(bp->dev, fltr->base.rxq,
>>       |                                     ^~~~~~~~~~~~~~~~~~~
>> 
>> Add back one #ifdef check around a call to the missing rps_may_expire_flow()
>> function.
>> 
>> Fixes: 59cde76f33fa ("bnxt_en: Refactor filter insertion logic in bnxt_rx_flow_steer().")
>> Cc: Michael Chan <michael.chan@...adcom.com>
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> ---
>> I don't know if this is a correct fix, only checked that it is plausible
>> and that it does address the build failure. If a different fix is needed,
>> please just treat this as a bug report.
>
> Are you using a kernel config with CONFIG_SMP=n ?  That was how I was
> able to reproduce this.

I saw this in two randconfig test builds on 32-bit arm, both with
SMP disabled, though I did not expect that to make a difference.

In case it helps, this is one of the two config files:
https://pastebin.com/raw/uxHEXzG2

> There is a good oppportunity to clean this up a little better.  When
> CONFIG_RFS_ACCEL is not set there is no reason to even have
> bnxt_cfg_ntp_filters included in the driver build.
>
> I'll talk to Michael and we will post a fix for this.

Ok, thanks!

     Arnd