linux-kernel - Re: [PATCHv3 perf/core 3/7] tools lib bpf: Add flags to bpf_create

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Date:   Fri, 9 Dec 2016 11:27:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Wangnan (F)" <wangnan0@...wei.com>
Cc:     Joe Stringer <joe@....org>, linux-kernel@...r.kernel.org,
        ast@...com, daniel@...earbox.net, netdev@...r.kernel.org
Subject: Re: [PATCHv3 perf/core 3/7] tools lib bpf: Add flags to
 bpf_create_map()

Em Fri, Dec 09, 2016 at 11:36:18AM +0800, Wangnan (F) escreveu:
> 
> 
> On 2016/12/9 10:46, Joe Stringer wrote:
> > The map_flags argument to bpf_create_map() was previously not exposed.
> > By exposing it, users can access flags such as whether or not to
> > preallocate the map.
> > 
> > Signed-off-by: Joe Stringer <joe@....org>
> 
> Please mention commit 6c90598174322b8888029e40dd84a4eb01f56afe in
> commit message:
> 
> Commit 6c905981743 ("bpf: pre-allocate hash map elements") introduces
> map_flags to bpf_attr for BPF_MAP_CREATE command. Expose this new
> parameter in libbpf.

will do it, thanks.

- Arnaldo
 
> Acked-by: Wang Nan <wangnan0@...wei.com>
> 
> > ---
> > v3: Split from "tools lib bpf: Sync with samples/bpf/libbpf".
> > ---
> >   tools/lib/bpf/bpf.c    | 3 ++-
> >   tools/lib/bpf/bpf.h    | 2 +-
> >   tools/lib/bpf/libbpf.c | 3 ++-
> >   3 files changed, 5 insertions(+), 3 deletions(-)
> > 
> > diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> > index 89e8e8e5b60e..d0afb26c2e0f 100644
> > --- a/tools/lib/bpf/bpf.c
> > +++ b/tools/lib/bpf/bpf.c
> > @@ -54,7 +54,7 @@ static int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
> >   }
> >   int bpf_create_map(enum bpf_map_type map_type, int key_size,
> > -		   int value_size, int max_entries)
> > +		   int value_size, int max_entries, __u32 map_flags)
> >   {
> >   	union bpf_attr attr;
> > @@ -64,6 +64,7 @@ int bpf_create_map(enum bpf_map_type map_type, int key_size,
> >   	attr.key_size = key_size;
> >   	attr.value_size = value_size;
> >   	attr.max_entries = max_entries;
> > +	attr.map_flags = map_flags;
> >   	return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
> >   }
> > diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
> > index 61130170a6ad..7fcdce16fd62 100644
> > --- a/tools/lib/bpf/bpf.h
> > +++ b/tools/lib/bpf/bpf.h
> > @@ -24,7 +24,7 @@
> >   #include <linux/bpf.h>
> >   int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
> > -		   int max_entries);
> > +		   int max_entries, __u32 map_flags);
> >   /* Recommend log buffer size */
> >   #define BPF_LOG_BUF_SIZE 65536
> > diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> > index 2e974593f3e8..84e6b35da4bd 100644
> > --- a/tools/lib/bpf/libbpf.c
> > +++ b/tools/lib/bpf/libbpf.c
> > @@ -854,7 +854,8 @@ bpf_object__create_maps(struct bpf_object *obj)
> >   		*pfd = bpf_create_map(def->type,
> >   				      def->key_size,
> >   				      def->value_size,
> > -				      def->max_entries);
> > +				      def->max_entries,
> > +				      0);
> >   		if (*pfd < 0) {
> >   			size_t j;
> >   			int err = *pfd;
>