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: <1aed1362-ef56-43ff-858a-07c575b8f0ca@intel.com>
Date:   Thu, 12 Oct 2023 18:13:50 +0200
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Tony Nguyen <anthony.l.nguyen@...el.com>
CC:     Jacob Keller <jacob.e.keller@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        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>,
        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

From: Randy Dunlap <rdunlap@...radead.org>
Date: Thu, 12 Oct 2023 08:47:12 -0700

> 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....

I don't know what happened, Tony dropped this commit from his tree due
to that we agreed yours (which optimizes out IPv6 code if it's not
enabled) is better, then Tony asked the netdev maintainers whether it
can be taken directly, but no updates since then.
I also asked Tony why he took my patch into his tree while I wrote under
the commit message that it should've been taken directly, also no replies :D
And all that for the bug that breaks linux-next build, meh.

> 
>>>
>>>>
>>>>> ---
>>>>>  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.

Thanks,
Olek