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bpf: offload: allow offloaded programs to use perf event arrays 

BPF_MAP_TYPE_PERF_EVENT_ARRAY is special as far as offload goes.
The map only holds glue to perf ring, not actual data.  Allow
non-offloaded perf event arrays to be used in offloaded programs.
Offload driver can extract the events from HW and put them in
the map for user space to retrieve.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-05-03 18:37:08 -07:00 committed by Daniel Borkmann
parent c27638c062
commit 0cd3cbed3c
2 changed files with 9 additions and 2 deletions
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5
include/linux/bpf.h
View File

@ -110,6 +110,11 @@ static inline struct bpf_offloaded_map *map_to_offmap(struct bpf_map *map)
return container_of(map, struct bpf_offloaded_map, map);
}
static inline bool bpf_map_offload_neutral(const struct bpf_map *map)
{
return map->map_type == BPF_MAP_TYPE_PERF_EVENT_ARRAY;
}
static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
{
return map->ops->map_seq_show_elem && map->ops->map_check_btf;

6
kernel/bpf/offload.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2017 Netronome Systems, Inc.
* Copyright (C) 2017-2018 Netronome Systems, Inc.
*
* This software is licensed under the GNU General License Version 2,
* June 1991 as shown in the file COPYING in the top-level directory of this
@ -474,8 +474,10 @@ bool bpf_offload_dev_match(struct bpf_prog *prog, struct bpf_map *map)
struct bpf_prog_offload *offload;
bool ret;
if (!bpf_prog_is_dev_bound(prog->aux) || !bpf_map_is_dev_bound(map))
if (!bpf_prog_is_dev_bound(prog->aux))
return false;
if (!bpf_map_is_dev_bound(map))
return bpf_map_offload_neutral(map);
down_read(&bpf_devs_lock);
offload = prog->aux->offload;