netdev - Re: [PATCH bpf-next v3 1/3] libbpf: move pr_*() functions to common header file

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Date:   Thu, 31 Jan 2019 11:42:52 +0100
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     Magnus Karlsson <magnus.karlsson@...el.com>,
        Björn Töpel <bjorn.topel@...el.com>,
        ast@...nel.org, Network Development <netdev@...r.kernel.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Björn Töpel <bjorn.topel@...il.com>,
        "Zhang, Qi Z" <qi.z.zhang@...el.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH bpf-next v3 1/3] libbpf: move pr_*() functions to common
 header file

On Thu, Jan 31, 2019 at 11:07 AM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> On 01/29/2019 04:12 PM, Magnus Karlsson wrote:
> > Move the pr_*() functions in libbpf.c to a common header file called
> > libbpf_internal.h. This so that the later libbpf AF_XDP helper library
> > code in xsk.c can use these printing functions too.
> >
> > Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
> > ---
> >  tools/lib/bpf/libbpf.c          | 30 +-----------------------------
> >  tools/lib/bpf/libbpf_internal.h | 41 +++++++++++++++++++++++++++++++++++++++++
> >  2 files changed, 42 insertions(+), 29 deletions(-)
> >  create mode 100644 tools/lib/bpf/libbpf_internal.h
> >
> > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> > index 2ccde17..1d7fe26 100644
> > --- a/tools/lib/bpf/libbpf.c
> > +++ b/tools/lib/bpf/libbpf.c
> > @@ -39,6 +39,7 @@
> >  #include <gelf.h>
> >
> >  #include "libbpf.h"
> > +#include "libbpf_internal.h"
> >  #include "bpf.h"
> >  #include "btf.h"
> >  #include "str_error.h"
> > @@ -51,34 +52,6 @@
> >  #define BPF_FS_MAGIC         0xcafe4a11
> >  #endif
> >
> > -#define __printf(a, b)       __attribute__((format(printf, a, b)))
> > -
> > -__printf(1, 2)
> > -static int __base_pr(const char *format, ...)
> > -{
> > -     va_list args;
> > -     int err;
> > -
> > -     va_start(args, format);
> > -     err = vfprintf(stderr, format, args);
> > -     va_end(args);
> > -     return err;
> > -}
> > -
> > -static __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
> > -static __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
> > -static __printf(1, 2) libbpf_print_fn_t __pr_debug;
> > -
> > -#define __pr(func, fmt, ...) \
> > -do {                         \
> > -     if ((func))             \
> > -             (func)("libbpf: " fmt, ##__VA_ARGS__); \
> > -} while (0)
> > -
> > -#define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
> > -#define pr_info(fmt, ...)    __pr(__pr_info, fmt, ##__VA_ARGS__)
> > -#define pr_debug(fmt, ...)   __pr(__pr_debug, fmt, ##__VA_ARGS__)
> > -
> >  void libbpf_set_print(libbpf_print_fn_t warn,
> >                     libbpf_print_fn_t info,
> >                     libbpf_print_fn_t debug)
> > @@ -96,7 +69,6 @@ void libbpf_set_print(libbpf_print_fn_t warn,
> >               goto out;               \
> >  } while(0)
> >
> > -
> >  /* Copied from tools/perf/util/util.h */
> >  #ifndef zfree
> >  # define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
> > diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h
> > new file mode 100644
> > index 0000000..951c078
> > --- /dev/null
> > +++ b/tools/lib/bpf/libbpf_internal.h
>
> Just really minor nit: lets name the header utils.h or such. It would also make
> sense to move the zfree() and zclose() to this and make use of it.

Will fix.

Thanks: Magnus

> > @@ -0,0 +1,41 @@
> > +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
> > +
> > +/*
> > + * Common internal libbpf functions and definitions.
> > + *
> > + * Copyright (C) 2013-2015 Alexei Starovoitov <ast@...nel.org>
> > + * Copyright (C) 2015 Wang Nan <wangnan0@...wei.com>
> > + * Copyright (C) 2015 Huawei Inc.
> > + */
> > +#ifndef __LIBBPF_LIBBPF_INTERNAL_H
> > +#define __LIBBPF_LIBBPF_INTERNAL_H
> > +
> > +#define __printf(a, b)       __attribute__((format(printf, a, b)))
> > +
> > +__printf(1, 2)
> > +static int __base_pr(const char *format, ...)
> > +{
> > +     va_list args;
> > +     int err;
> > +
> > +     va_start(args, format);
> > +     err = vfprintf(stderr, format, args);
> > +     va_end(args);
> > +     return err;
> > +}
> > +
> > +static __maybe_unused __printf(1, 2) libbpf_print_fn_t __pr_warning = __base_pr;
> > +static __maybe_unused __printf(1, 2) libbpf_print_fn_t __pr_info = __base_pr;
> > +static __maybe_unused __printf(1, 2) libbpf_print_fn_t __pr_debug;
> > +
> > +#define __pr(func, fmt, ...) \
> > +do {                         \
> > +     if ((func))             \
> > +             (func)("libbpf: " fmt, ##__VA_ARGS__); \
> > +} while (0)
> > +
> > +#define pr_warning(fmt, ...) __pr(__pr_warning, fmt, ##__VA_ARGS__)
> > +#define pr_info(fmt, ...)    __pr(__pr_info, fmt, ##__VA_ARGS__)
> > +#define pr_debug(fmt, ...)   __pr(__pr_debug, fmt, ##__VA_ARGS__)
> > +
> > +#endif /* __LIBBPF_LIBBPF_INTERNAL_H */
> >
>