Commit 0cd3cbed authored by Jakub Kicinski's avatar Jakub Kicinski Committed by Daniel Borkmann
Browse files

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: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: default avatarQuentin Monnet <quentin.monnet@netronome.com>
Reviewed-by: default avatarJiong Wang <jiong.wang@netronome.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
parent c27638c0

include/linux/bpf.h

+5 −0
Original line number Diff line number Diff line
@@ -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;

kernel/bpf/offload.c

+4 −2
Original line number Diff line number Diff line 
/*

 * 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;

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