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From: Andy Gospodarek <andrew.gospodarek@broadcom.com>
Date: Wed, 3 Jan 2024 10:46:19 -0500
To: Arnd Bergmann <arnd@kernel.org>
Cc: Michael Chan <michael.chan@broadcom.com>, Arnd Bergmann <arnd@arndb.de>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Andy Gospodarek <andrew.gospodarek@broadcom.com>,
	Pavan Chebbi <pavan.chebbi@broadcom.com>,
	Somnath Kotur <somnath.kotur@broadcom.com>,
	Kalesh AP <kalesh-anakkur.purayil@broadcom.com>,
	Randy Schacher <stuart.schacher@broadcom.com>,
	Vasundhara Volam <vasundhara-v.volam@broadcom.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] bnxt: fix building without CONFIG_RFS_ACCEL
Message-ID: <ZZWBS5EugvO2dBp0@C02YVCJELVCG.dhcp.broadcom.net>
References: <20240103102332.3642417-1-arnd@kernel.org>
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On Wed, Jan 03, 2024 at 11:23:11AM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.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@broadcom.com>
> Signed-off-by: Arnd Bergmann <arnd@arndb.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.

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.

> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> index 827821e89c40..83a97c65b728 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> @@ -14074,6 +14074,7 @@ static void bnxt_cfg_ntp_filters(struct bnxt *bp)
>  			if (test_bit(BNXT_FLTR_VALID, &fltr->base.state)) {
>  				if (fltr->base.flags & BNXT_ACT_NO_AGING)
>  					continue;
> +#if IS_ENABLED(CONFIG_RFS_ACCEL)
>  				if (rps_may_expire_flow(bp->dev, fltr->base.rxq,
>  							fltr->flow_id,
>  							fltr->base.sw_id)) {
> @@ -14081,6 +14082,7 @@ static void bnxt_cfg_ntp_filters(struct bnxt *bp)
>  									 fltr);
>  					del = true;
>  				}
> +#endif
>  			} else {
>  				rc = bnxt_hwrm_cfa_ntuple_filter_alloc(bp,
>  								       fltr);
> -- 
> 2.39.2
>