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: <CO1PR11MB508965D49B6144B0CC7E5221D6D3A@CO1PR11MB5089.namprd11.prod.outlook.com>
Date:   Thu, 12 Oct 2023 18:34:00 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "Lobakin, Aleksander" <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:     "Michalik, Michal" <michal.michalik@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Richard Cochran <richardcochran@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "Olech, Milena" <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



> -----Original Message-----
> From: Randy Dunlap <rdunlap@...radead.org>
> Sent: Thursday, October 12, 2023 8:47 AM
> To: Keller, Jacob E <jacob.e.keller@...el.com>; Lobakin, Aleksander
> <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: Michalik, Michal <michal.michalik@...el.com>; netdev@...r.kernel.org;
> Richard Cochran <richardcochran@...il.com>; linux-kernel@...r.kernel.org;
> Kubalewski, Arkadiusz <arkadiusz.kubalewski@...el.com>; intel-wired-
> lan@...ts.osuosl.org; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Olech,
> Milena <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@...radead.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....
> 

A standalone version for the idpf driver fix was posted at [1], and another alternative fix was posted at [2]

Fixes for the ice driver have already merged.

[1]: https://lore.kernel.org/netdev/20230921125936.1621191-1-aleksander.lobakin@intel.com/
[2]: https://lore.kernel.org/netdev/20230925155858.651425-1-arnd@kernel.org/

The fix from Arnd got approval from Olek, but it seems like it stalled out after asking about stubs. I'm fine with either approach but would  also like to see a fix merge soon.

Thanks,
Jake