linux-kernel - Re: [PATCH net-next 3/3] idpf: fix undefined reference to tcp_gro_complete() when !CONFIG

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Date:   Wed, 20 Sep 2023 14:30:09 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Alexander Lobakin <aleksander.lobakin@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Tony Nguyen <anthony.l.nguyen@...el.com>,
        Richard Cochran <richardcochran@...il.com>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        Michal Michalik <michal.michalik@...el.com>,
        Milena Olech <milena.olech@...el.com>,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 3/3] idpf: fix undefined reference to
 tcp_gro_complete() when !CONFIG_INET



On 9/20/23 11:07, Alexander Lobakin wrote:
> When CONFIG_INET is not set, tcp_gro_complete is not compiled, although
> the drivers using it may still be compiled (spotted by Randy):
> 
> aarch64-linux-ld: drivers/net/ethernet/intel/idpf/idpf_txrx.o:
> in function `idpf_rx_rsc.isra.0':
> drivers/net/ethernet/intel/idpf/idpf_txrx.c:2909:(.text+0x40cc):
> undefined reference to `tcp_gro_complete'
> 
> The drivers need to guard the calls to it manually.
> Return early from the RSC completion function if !CONFIG_INET, it won't
> work properly either way. This effectively makes it be compiled-out
> almost entirely on such builds.
> 
> Fixes: 3a8845af66ed ("idpf: add RX splitq napi poll support")
> Reported-by: Randy Dunlap <rdunlap@...radead.org>
> Closes: https://lore.kernel.org/linux-next/4c84eb7b-3dec-467b-934b-8a0240f7fb12@infradead.org
> Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>

That builds for me.  Thanks.

Tested-by: Randy Dunlap <rdunlap@...radead.org>

I hope that these patches can be merged into the v6.6 instead of
v6.7 kernel at some point (i.e., [PATCH net] instead of net-next).


> ---
>  drivers/net/ethernet/intel/idpf/idpf_txrx.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/net/ethernet/intel/idpf/idpf_txrx.c b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> index 6fa79898c42c..aa45afeb6496 100644
> --- a/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> +++ b/drivers/net/ethernet/intel/idpf/idpf_txrx.c
> @@ -2876,6 +2876,9 @@ static int idpf_rx_rsc(struct idpf_queue *rxq, struct sk_buff *skb,
>  	if (unlikely(!(ipv4 ^ ipv6)))
>  		return -EINVAL;
>  
> +	if (!IS_ENABLED(CONFIG_INET))
> +		return 0;
> +
>  	rsc_segments = DIV_ROUND_UP(skb->data_len, rsc_seg_len);
>  	if (unlikely(rsc_segments == 1))
>  		return 0;

-- 
~Randy