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

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Date:   Wed, 10 Jul 2019 11:46:36 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Bernard Metzler <bmt@...ich.ibm.com>,
        Doug Ledford <dledford@...hat.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: [PATCH -next] rdma/siw: Add missing dependencies on LIBCRC32C
 and DMA_VIRT_OPS

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?

Jason