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samples/bpf: load_bpf.c make callback fixup more flexible

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Do this change before others start to use this callback.
Change map_perf_test_user.c which seems to be the only user.

This patch extends capabilities of commit 9fd63d05f3 ("bpf:
Allow bpf sample programs (*_user.c) to change bpf_map_def").

Give fixup callback access to struct bpf_map_data, instead of
only stuct bpf_map_def.  This add flexibility to allow userspace
to reassign the map file descriptor.  This is very useful when
wanting to share maps between several bpf programs.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer
2017-05-02 14:32:01 +02:00
committed by David S. Miller
parent 156450d9d9
commit 6979bcc731
3 changed files with 23 additions and 18 deletions
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17
samples/bpf/bpf_load.c
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@@ -39,13 +39,6 @@ int event_fd[MAX_PROGS];
int prog_cnt;
int prog_array_fd = -1;
/* Keeping relevant info on maps */
struct bpf_map_data {
int fd;
char *name;
size_t elf_offset;
struct bpf_map_def def;
};
struct bpf_map_data map_data[MAX_MAPS];
int map_data_count = 0;
@@ -202,8 +195,14 @@ static int load_maps(struct bpf_map_data *maps, int nr_maps,
int i;
for (i = 0; i < nr_maps; i++) {
if (fixup_map)
fixup_map(&maps[i].def, maps[i].name, i);
if (fixup_map) {
fixup_map(&maps[i], i);
/* Allow userspace to assign map FD prior to creation */
if (maps[i].fd != -1) {
map_fd[i] = maps[i].fd;
continue;
}
}
if (maps[i].def.type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
maps[i].def.type == BPF_MAP_TYPE_HASH_OF_MAPS) {