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authorJesper Dangaard Brouer <brouer@redhat.com>2017-05-02 14:32:01 +0200
committerDavid S. Miller <davem@davemloft.net>2017-05-03 09:30:24 -0400
commit6979bcc731f9680824a85a9efc43f36d01cec1b2 (patch)
tree930220b0624efcd0c0b94e4c3dbaabf85202fc72 /samples
parent156450d9d964447adfb44a231c634d2f5609d110 (diff)
download96b-common-6979bcc731f9680824a85a9efc43f36d01cec1b2.tar.gz
samples/bpf: load_bpf.c make callback fixup more flexible
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 9fd63d05f3e8 ("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>
Diffstat (limited to 'samples')
-rw-r--r--samples/bpf/bpf_load.c17
-rw-r--r--samples/bpf/bpf_load.h10
-rw-r--r--samples/bpf/map_perf_test_user.c14
3 files changed, 23 insertions, 18 deletions
diff --git a/samples/bpf/bpf_load.c b/samples/bpf/bpf_load.c
index fedec29c7817..74456b3eb89a 100644
--- a/samples/bpf/bpf_load.c
+++ b/samples/bpf/bpf_load.c
@@ -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) {
diff --git a/samples/bpf/bpf_load.h b/samples/bpf/bpf_load.h
index 05822f83173a..4d4fd4678a64 100644
--- a/samples/bpf/bpf_load.h
+++ b/samples/bpf/bpf_load.h
@@ -15,8 +15,14 @@ struct bpf_map_def {
unsigned int inner_map_idx;
};
-typedef void (*fixup_map_cb)(struct bpf_map_def *map, const char *map_name,
- int idx);
+struct bpf_map_data {
+ int fd;
+ char *name;
+ size_t elf_offset;
+ struct bpf_map_def def;
+};
+
+typedef void (*fixup_map_cb)(struct bpf_map_data *map, int idx);
extern int map_fd[MAX_MAPS];
extern int prog_fd[MAX_PROGS];
diff --git a/samples/bpf/map_perf_test_user.c b/samples/bpf/map_perf_test_user.c
index 6ac778153315..1a8894b5ac51 100644
--- a/samples/bpf/map_perf_test_user.c
+++ b/samples/bpf/map_perf_test_user.c
@@ -320,21 +320,21 @@ static void fill_lpm_trie(void)
assert(!r);
}
-static void fixup_map(struct bpf_map_def *map, const char *name, int idx)
+static void fixup_map(struct bpf_map_data *map, int idx)
{
int i;
- if (!strcmp("inner_lru_hash_map", name)) {
+ if (!strcmp("inner_lru_hash_map", map->name)) {
inner_lru_hash_idx = idx;
- inner_lru_hash_size = map->max_entries;
+ inner_lru_hash_size = map->def.max_entries;
}
- if (!strcmp("array_of_lru_hashs", name)) {
+ if (!strcmp("array_of_lru_hashs", map->name)) {
if (inner_lru_hash_idx == -1) {
printf("inner_lru_hash_map must be defined before array_of_lru_hashs\n");
exit(1);
}
- map->inner_map_idx = inner_lru_hash_idx;
+ map->def.inner_map_idx = inner_lru_hash_idx;
array_of_lru_hashs_idx = idx;
}
@@ -345,9 +345,9 @@ static void fixup_map(struct bpf_map_def *map, const char *name, int idx)
/* Only change the max_entries for the enabled test(s) */
for (i = 0; i < NR_TESTS; i++) {
- if (!strcmp(test_map_names[i], name) &&
+ if (!strcmp(test_map_names[i], map->name) &&
(check_test_flags(i))) {
- map->max_entries = num_map_entries;
+ map->def.max_entries = num_map_entries;
}
}
}