netdev - Re: [PATCH v4 bpf-next 0/2] bpf: Add a new API

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Date:   Fri, 7 Jun 2019 23:25:58 +0000
From:   Roman Gushchin <guro@...com>
To:     Daniel Borkmann <daniel@...earbox.net>, Hechao Li <hechaol@...com>
CC:     Hechao Li <hechaol@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>, Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v4 bpf-next 0/2] bpf: Add a new API

On 06/07/2019 06:37 PM, Hechao Li wrote:
> Getting number of possible CPUs is commonly used for per-CPU BPF maps
> and perf_event_maps. Add a new API libbpf_num_possible_cpus() that
> helps user with per-CPU related operations and remove duplicate
> implementations in bpftool and selftests.
> 
> v4: Fixed error code when reading 0 bytes from possible CPU file
> 
> Hechao Li (2):
>   bpf: add a new API libbpf_num_possible_cpus()
>   bpf: use libbpf_num_possible_cpus in bpftool and selftests
> 
>  tools/bpf/bpftool/common.c             | 53 +++---------------------
>  tools/lib/bpf/libbpf.c                 | 57 ++++++++++++++++++++++++++
>  tools/lib/bpf/libbpf.h                 | 16 ++++++++
>  tools/lib/bpf/libbpf.map               |  1 +
>  tools/testing/selftests/bpf/bpf_util.h | 37 +++--------------
>  5 files changed, 84 insertions(+), 80 deletions(-)

> Series applied, thanks!

> P.s.: Please retain full history (v1->v2->v3->v4) in cover letter next time as
> that is typical convention and helps readers of git log to follow what has been
> changed over time.


Hello!

I'm getting the following errors on an attempt to build bpf tests.
Reverting the last patch fixes it.

Please, take a look.

Thank you!


clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /opt/fb/devtoolset/bin/../lib/clang/4.0.0/include -idirafter /usr/include -Wno-compare-distinct-pointer-types \
	 -O2 -target bpf -emit-llvm -c progs/sockmap_parse_prog.c -o - |      \
llc -march=bpf -mcpu=generic  -filetype=obj -o /data/users/guro/linux/tools/testing/selftests/bpf/sockmap_parse_prog.o
In file included from progs/sockmap_parse_prog.c:3:
./bpf_util.h:9:10: fatal error: 'libbpf.h' file not found
#include <libbpf.h>
         ^~~~~~~~~~
1 error generated.

...

clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /opt/fb/devtoolset/bin/../lib/clang/4.0.0/include -idirafter /usr/include -Wno-compare-distinct-pointer-types \
	 -O2 -target bpf -emit-llvm -c progs/test_sysctl_prog.c -o - |      \
llc -march=bpf -mcpu=generic  -filetype=obj -o /data/users/guro/linux/tools/testing/selftests/bpf/test_sysctl_prog.o
In file included from progs/test_sysctl_prog.c:11:
./bpf_util.h:9:10: fatal error: 'libbpf.h' file not found
#include <libbpf.h>
         ^~~~~~~~~~
1 error generated.
clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /opt/fb/devtoolset/bin/../lib/clang/4.0.0/include -idirafter /usr/include -Wno-compare-distinct-pointer-types \
	 -O2 -target bpf -emit-llvm -c progs/sockmap_verdict_prog.c -o - |      \
llc -march=bpf -mcpu=generic  -filetype=obj -o /data/users/guro/linux/tools/testing/selftests/bpf/sockmap_verdict_prog.o
In file included from progs/sockmap_verdict_prog.c:3:
./bpf_util.h:9:10: fatal error: 'libbpf.h' file not found
#include <libbpf.h>
         ^~~~~~~~~~
1 error generated.

...

clang -I. -I./include/uapi -I../../../include/uapi -idirafter /usr/local/include -idirafter /opt/fb/devtoolset/bin/../lib/clang/4.0.0/include -idirafter /usr/include -Wno-compare-distinct-pointer-types \
	 -O2 -target bpf -emit-llvm -c progs/sockmap_tcp_msg_prog.c -o - |      \
llc -march=bpf -mcpu=generic  -filetype=obj -o /data/users/guro/linux/tools/testing/selftests/bpf/sockmap_tcp_msg_prog.o
In file included from progs/sockmap_tcp_msg_prog.c:3:
./bpf_util.h:9:10: fatal error: 'libbpf.h' file not found
#include <libbpf.h>
         ^~~~~~~~~~
1 error generated.