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

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Date:   Wed, 20 Sep 2023 17:04:29 -0700
From:   Jacob Keller <jacob.e.keller@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        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:     Michal Michalik <michal.michalik@...el.com>,
        <netdev@...r.kernel.org>,
        Richard Cochran <richardcochran@...il.com>,
        <linux-kernel@...r.kernel.org>,
        Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
        <intel-wired-lan@...ts.osuosl.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Milena Olech <milena.olech@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH net-next 3/3] idpf: fix undefined
 reference to tcp_gro_complete() when !CONFIG_INET



On 9/20/2023 2:30 PM, Randy Dunlap wrote:
> 
> 
> 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).
> 

Did any of the offending code make it into 6.6? I thought all of this
was from recent merges after 6.6 closed.

Thanks,
Jake

> 
>> ---
>>  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;
>