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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Message-ID: <b5c1030a-9831-4580-8684-7c68f5888131@infradead.org>
Date:   Thu, 12 Oct 2023 08:47:12 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Jacob Keller <jacob.e.keller@...el.com>,
        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

Hi,

On 9/20/23 18:30, Randy Dunlap wrote:
> 
> 
> On 9/20/23 17:04, Jacob Keller wrote:
>>
>>
>> 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
> 
> Oh, I think that you are correct. Sorry about my comment.
> Thanks.
> 

Even if this is just > v6.6 kernels (i.e., linux-next),
it would be very good to get a fix merged for these build errors.
I keep getting build errors in linux-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;
>>>
> 

Thanks.
-- 
~Randy