netdev - Re: [PATCH bpf-next v3 08/13] tools: libbpf: add extended attributes version of bpf_object_

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Date:   Tue, 10 Jul 2018 20:03:44 -0700
From:   Andrey Ignatov <rdna@...com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     <alexei.starovoitov@...il.com>, <daniel@...earbox.net>,
        <oss-drivers@...ronome.com>, <netdev@...r.kernel.org>
Subject: Re: [PATCH bpf-next v3 08/13] tools: libbpf: add extended attributes
 version of bpf_object__open()

Jakub Kicinski <jakub.kicinski@...ronome.com> [Tue, 2018-07-10 14:43 -0700]:
> Similarly to bpf_prog_load() users of bpf_object__open() may need
> to specify the expected program type.  Program type is needed at
> open to avoid the kernel version check for program types which don't
> require it.
> 
> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
> ---
> v3 (Andrey):
>  - put file path into the attr struct.
> ---
>  tools/lib/bpf/libbpf.c | 26 ++++++++++++++++++++------
>  tools/lib/bpf/libbpf.h |  6 ++++++
>  2 files changed, 26 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 30992305f4c1..06cd534d2fba 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -1520,15 +1520,26 @@ __bpf_object__open(const char *path, void *obj_buf, size_t obj_buf_sz,
>  	return ERR_PTR(err);
>  }
>  
> -struct bpf_object *bpf_object__open(const char *path)
> +struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr)
>  {
>  	/* param validation */
> -	if (!path)
> +	if (!attr->file)
>  		return NULL;
>  
> -	pr_debug("loading %s\n", path);
> +	pr_debug("loading %s\n", attr->file);
> +
> +	return __bpf_object__open(attr->file, NULL, 0,
> +				  bpf_prog_type__needs_kver(attr->prog_type));
> +}
> +
> +struct bpf_object *bpf_object__open(const char *path)
> +{
> +	struct bpf_object_open_attr attr = {
> +		.file		= path,
> +		.prog_type	= BPF_PROG_TYPE_UNSPEC,
> +	};
>  
> -	return __bpf_object__open(path, NULL, 0, true);
> +	return bpf_object__open_xattr(&attr);
>  }
>  
>  struct bpf_object *bpf_object__open_buffer(void *obj_buf,
> @@ -2238,6 +2249,10 @@ int bpf_prog_load(const char *file, enum bpf_prog_type type,
>  int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
>  			struct bpf_object **pobj, int *prog_fd)
>  {
> +	struct bpf_object_open_attr open_attr = {
> +		.file		= attr->file,
> +		.prog_type	= attr->prog_type,
> +	};
>  	struct bpf_program *prog, *first_prog = NULL;
>  	enum bpf_attach_type expected_attach_type;
>  	enum bpf_prog_type prog_type;
> @@ -2250,8 +2265,7 @@ int bpf_prog_load_xattr(const struct bpf_prog_load_attr *attr,
>  	if (!attr->file)
>  		return -EINVAL;
>  
> -	obj = __bpf_object__open(attr->file, NULL, 0,
> -				 bpf_prog_type__needs_kver(attr->prog_type));
> +	obj = bpf_object__open_xattr(&open_attr);
>  	if (IS_ERR_OR_NULL(obj))
>  		return -ENOENT;
>  
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 749acf58a5da..e911ad32d02e 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -66,7 +66,13 @@ void libbpf_set_print(libbpf_print_fn_t warn,
>  /* Hide internal to user */
>  struct bpf_object;
>  
> +struct bpf_object_open_attr {
> +	const char *file;
> +	enum bpf_prog_type prog_type;
> +};
> +
>  struct bpf_object *bpf_object__open(const char *path);
> +struct bpf_object *bpf_object__open_xattr(struct bpf_object_open_attr *attr);
>  struct bpf_object *bpf_object__open_buffer(void *obj_buf,
>  					   size_t obj_buf_sz,
>  					   const char *name);
> -- 
> 2.17.1
> 

Acked-by: Andrey Ignatov <rdna@...com>

-- 
Andrey Ignatov