linux-kernel - Re: [PATCH -next] rdma/siw: Add missing dependencies on LIBCRC32C and DMA_VIRT

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Message-ID: <CAMuHMdW4GP5FDhDuY1w3u0NypSCE84pPB-T7JoA+4odaPnhT5Q@mail.gmail.com>
Date:   Thu, 11 Jul 2019 09:58:46 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Bernard Metzler <bmt@...ich.ibm.com>,
        Doug Ledford <dledford@...hat.com>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Next <linux-next@...r.kernel.org>
Subject: Re: [PATCH -next] rdma/siw: Add missing dependencies on LIBCRC32C and DMA_VIRT_OPS

Hi Jason,

On Wed, Jul 10, 2019 at 4:46 PM Jason Gunthorpe <jgg@...pe.ca> wrote:
> On Wed, Jul 10, 2019 at 03:39:30PM +0200, Geert Uytterhoeven wrote:
> > If LIBCRC32C and DMA_VIRT_OPS are not enabled:
> >
> >     drivers/infiniband/sw/siw/siw_main.o: In function `siw_newlink':
> >     siw_main.c:(.text+0x35c): undefined reference to `dma_virt_ops'
> >     drivers/infiniband/sw/siw/siw_qp_rx.o: In function `siw_csum_update':
> >     siw_qp_rx.c:(.text+0x16): undefined reference to `crc32c'
> >
> > Fix the first issue by adding a select of DMA_VIRT_OPS.
> > Fix the second issue by replacing the unneeded dependency on
> > CRYPTO_CRC32 by a dependency on LIBCRC32C.
> >
> > Reported-by: noreply@...erman.id.au (first issue)
> > Fixes: c0cf5bdde46c664d ("rdma/siw: addition to kernel build environment")
> > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> >  drivers/infiniband/sw/siw/Kconfig | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/infiniband/sw/siw/Kconfig b/drivers/infiniband/sw/siw/Kconfig
> > index 94f684174ce3556e..b622fc62f2cd6d46 100644
> > +++ b/drivers/infiniband/sw/siw/Kconfig
> > @@ -1,6 +1,7 @@
> >  config RDMA_SIW
> >       tristate "Software RDMA over TCP/IP (iWARP) driver"
> > -     depends on INET && INFINIBAND && CRYPTO_CRC32
> > +     depends on INET && INFINIBAND && LIBCRC32C
>
> Is this the best practice?
>
> siw is using both the libcrc32c API and the
> 'crypto_alloc_shash("crc32c", 0, 0);' version. Is it right to get that
> transitively through LIBCRC32C?

Yes, I think so.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds