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samples/bpf: export map_data[] for more info on maps 

Giving *_user.c side tools access to map_data[] provides easier
access to information on the maps being loaded.  Still provide
the guarantee that the order maps are being defined in inside the
_kern.c file corresponds with the order in the array.  Now user
tools are not blind, but can inspect and verify the maps that got
loaded from the ELF binary.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
zero-colors
Jesper Dangaard Brouer 2017-05-02 14:32:06 +02:00 committed by David S. Miller
parent 6979bcc731
commit 9178b4c17d
1 changed files with 7 additions and 1 deletions
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8
samples/bpf/bpf_load.h
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@ -24,12 +24,18 @@ struct bpf_map_data {
typedef void (*fixup_map_cb)(struct bpf_map_data *map, int idx);
extern int map_fd[MAX_MAPS];
extern int prog_fd[MAX_PROGS];
extern int event_fd[MAX_PROGS];
extern char bpf_log_buf[BPF_LOG_BUF_SIZE];
extern int prog_cnt;
/* There is a one-to-one mapping between map_fd[] and map_data[].
* The map_data[] just contains more rich info on the given map.
*/
extern int map_fd[MAX_MAPS];
extern struct bpf_map_data map_data[MAX_MAPS];
extern int map_data_count;
/* parses elf file compiled by llvm .c->.o
* . parses 'maps' section and creates maps via BPF syscall
* . parses 'license' section and passes it to syscall