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Date: Tue, 1 Aug 2023 14:03:43 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: Ali Alnubani <alialnu@nvidia.com>
CC: David Marchand <david.marchand@redhat.com>, Patrick Robb
<probb@iol.unh.edu>, Tyler Retzlaff <roretzla@linux.microsoft.com>,
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Subject: Re: [PATCH v3] build: update DPDK to use C11 standard
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On Tue, Aug 01, 2023 at 12:42:36PM +0000, Ali Alnubani wrote:
> > -----Original Message-----
> > From: Bruce Richardson <bruce.richardson@intel.com>
> > Sent: Tuesday, August 1, 2023 1:51 PM
> > To: David Marchand <david.marchand@redhat.com>
> > Cc: Patrick Robb <probb@iol.unh.edu>; Tyler Retzlaff
> > <roretzla@linux.microsoft.com>; dev@dpdk.org; Morten Brørup
> > <mb@smartsharesystems.com>; NBU-Contact-Thomas Monjalon
> > (EXTERNAL) <thomas@monjalon.net>
> > Subject: Re: [PATCH v3] build: update DPDK to use C11 standard
> >
> > On Tue, Aug 01, 2023 at 11:39:06AM +0100, Bruce Richardson wrote:
> > > On Tue, Aug 01, 2023 at 12:35:21PM +0200, David Marchand wrote:
> > > > On Tue, Aug 1, 2023 at 12:19 PM Bruce Richardson
> > > > <bruce.richardson@intel.com> wrote:
> > > > >
> > > > > On Mon, Jul 31, 2023 at 08:39:31PM -0400, Patrick Robb wrote:
> > > > > > Hi Bruce,
> > > > > > I see some failures for this series for our Ubuntu 20.04 containers.
> > > <snip>
> > > > >
> > > > > Hi again,
> > > > >
> > > > > I've attempted to reproduce this on my Ubuntu 20.04 VM and failed,
> > > > > everything seems to build ok.
> > > > >
> > > > > Looking through the logs, though, there does appear to be a difference in
> > > > > the configurations in the two cases. I suspect my Ubuntu has an updated
> > > > > verbs package compared to the image you are using. In the log of the
> > failed
> > > > > build, I see:
> > > > >
> > > > > Checking whether type "struct mlx4_wqe_lso_seg" has member
> > "mss_hdr_size" with dependencies libmlx4, libibverbs: NO
> > > > > Configuring mlx4_autoconf.h using configuration
> > > > >
> > > > > While building in my VM, I have:
> > > > >
> > > > > Checking whether type "struct mlx4_wqe_lso_seg" has member
> > "mss_hdr_size" with dependencies libmlx4, libibverbs: YES (cached)
> > > > > Configuring mlx4_autoconf.h using configuration
> > > > >
> > > > > So my verbs mlx4 header has got a different set of definitions to those in
> > > > > the CI machine. My Ubuntu reports as 20.04.6 with libibverbs-dev
> > package
> > > > > version "28.0-1ubuntu1"
> > > > >
> > > > > Can the CI image be updated to latest 20.04 packages?
> > > > >
> > > > > /Bruce
> > > > >
> > > >
> > > > I can reproduce the issue seen at UNH, with a 20.04.6 container and
> > > > the same libibverbs as you:
> > > > ii libibverbs-dev:amd64 28.0-1ubuntu1
> > > > amd64 Development files for the libibverbs library
> > > >
> > > > So I suspect something is different in container images..
> > > >
> > > > Pasting the (hopefully) relevant meson logs:
> > > >
> > > > Running compile:
> > > > Working directory: /root/dpdk/build/meson-private/tmp0ovvvd9g
> > > > Command line: ccache cc -I/usr/include/libnl3
> > > > /root/dpdk/build/meson-private/tmp0ovvvd9g/testfile.c -o
> > > > /root/dpdk/build/meson-private/tmp0ovvvd9g/output.obj -pipe -c
> > > > -D_FILE_OFFSET_BITS=64 -O0 -std=c11
> > > >
> > > > Code:
> > > > #include <infiniband/mlx4dv.h>
> > > > void bar(void) {
> > > > struct mlx4_wqe_lso_seg foo;
> > > > foo.mss_hdr_size;
> > > >
> > > > };
> > > > Compiler stdout:
> > > >
> > > > Compiler stderr:
> > > > In file included from /root/dpdk/build/meson-
> > private/tmp0ovvvd9g/testfile.c:1:
> > > > /usr/include/infiniband/mlx4dv.h:176:2: error: unknown type name 'off_t'
> > > > 176 | off_t uar_mmap_offset;
> > > > | ^~~~~
> > > >
> > > > Checking whether type "struct mlx4_wqe_lso_seg" has member
> > > > "mss_hdr_size" with dependencies libmlx4, libibverbs: NO
> > > >
> > > Thanks. I'll dig some more.
> >
> > I think the meson version may be the culprit here. In my meson log I don't
> > see the -std=c11 flag appended to the test compilation command.
> >
> > Let me downgrade my meson version and see if I can reproduce.
> >
> > /Bruce
>
> Hello,
>
> I see two other build failures.
>
> On Ubuntu 20.04 with clang 10 and rdma-core v47.0 (built from source), I see errors similar to these:
>
> drivers/common/mlx5/linux/mlx5_glue.h:58:6: error: redefinition of 'mlx5_ib_uapi_flow_action_packet_reformat_type'
> [..]
> drivers/common/mlx5/linux/mlx5_glue.h:59:6: error: redefinition of 'mlx5_ib_uapi_flow_table_type'
> [..]
> drivers/common/mlx5/linux/mlx5_glue.h:121:2: error: redefinition of enumerator 'MLX5DV_DR_ACTION_DEST_REFORMAT'
> [..]
>
I believe I have a fix for these. The checks for the various structure
members need the driver "cflags" passed as args to the check, as the
std=c11 means that some things like off_t type are no longer defined (off_t
is posix)
> On Ubuntu 20.04 while cross compiling for ppc64le with powerpc64le-linux-gnu-gcc 9.4, I see:
>
> [..]
> lib/acl/acl_run_altivec.h:44:16: error: two or more data types in declaration specifiers
> [..]
> lib/acl/acl_run_altivec.h:44:2: error: use of boolean types in AltiVec types is invalid
> [..]
> error: incompatible types when assigning to type '__vector unsigned char' {aka '__vector(16) unsigned char'} from type '__vector __bool int' {aka '__vector(4) __bool int'}
> [..]
> lib/acl/acl_run_altivec.h:66:4: error: invalid parameter combination for AltiVec intrinsic '__builtin_vec_sel'
> [..]
>
This I still need to investigate.
In the meantime, I'll do a new version to see if the Ubuntu 20.04 issues
with the mlx drivers goes away with my fix.
/Bruce