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bpf: Use bpf_map_lookup_elem() from the library
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Replace bpf_map_lookup() with bpf_map_lookup_elem() calls.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Mickaël Salaün authored and David S. Miller committed Feb 10, 2017
1 parent 10ecc72 commit e5ff7c4
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Showing 6 changed files with 39 additions and 50 deletions.
2 changes: 1 addition & 1 deletion tools/lib/bpf/bpf.c
Original file line number Diff line number Diff line change
Expand Up @@ -112,7 +112,7 @@ int bpf_map_update_elem(int fd, const void *key, const void *value,
return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
}

int bpf_map_lookup_elem(int fd, void *key, void *value)
int bpf_map_lookup_elem(int fd, const void *key, void *value)
{
union bpf_attr attr;

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2 changes: 1 addition & 1 deletion tools/lib/bpf/bpf.h
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
int bpf_map_update_elem(int fd, const void *key, const void *value,
__u64 flags);

int bpf_map_lookup_elem(int fd, void *key, void *value);
int bpf_map_lookup_elem(int fd, const void *key, void *value);
int bpf_map_delete_elem(int fd, void *key);
int bpf_map_get_next_key(int fd, void *key, void *next_key);
int bpf_obj_pin(int fd, const char *pathname);
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11 changes: 0 additions & 11 deletions tools/testing/selftests/bpf/bpf_sys.h
Original file line number Diff line number Diff line change
Expand Up @@ -24,17 +24,6 @@ static inline int bpf(int cmd, union bpf_attr *attr, unsigned int size)
#endif
}

static inline int bpf_map_lookup(int fd, const void *key, void *value)
{
union bpf_attr attr = {};

attr.map_fd = fd;
attr.key = bpf_ptr_to_u64(key);
attr.value = bpf_ptr_to_u64(value);

return bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
}

static inline int bpf_map_delete(int fd, const void *key)
{
union bpf_attr attr = {};
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16 changes: 8 additions & 8 deletions tools/testing/selftests/bpf/test_lpm_map.c
Original file line number Diff line number Diff line change
Expand Up @@ -211,7 +211,7 @@ static void test_lpm_map(int keysize)

key->prefixlen = 8 * keysize;
memcpy(key->data, data, keysize);
r = bpf_map_lookup(map, key, value);
r = bpf_map_lookup_elem(map, key, value);
assert(!r || errno == ENOENT);
assert(!t == !!r);

Expand Down Expand Up @@ -300,32 +300,32 @@ static void test_lpm_ipaddr(void)

/* Test some lookups that should come back with a value */
inet_pton(AF_INET, "192.168.128.23", key_ipv4->data);
assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == 0);
assert(bpf_map_lookup_elem(map_fd_ipv4, key_ipv4, &value) == 0);
assert(value == 3);

inet_pton(AF_INET, "192.168.0.1", key_ipv4->data);
assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == 0);
assert(bpf_map_lookup_elem(map_fd_ipv4, key_ipv4, &value) == 0);
assert(value == 2);

inet_pton(AF_INET6, "2a00:1450:4001:814::", key_ipv6->data);
assert(bpf_map_lookup(map_fd_ipv6, key_ipv6, &value) == 0);
assert(bpf_map_lookup_elem(map_fd_ipv6, key_ipv6, &value) == 0);
assert(value == 0xdeadbeef);

inet_pton(AF_INET6, "2a00:1450:4001:814::1", key_ipv6->data);
assert(bpf_map_lookup(map_fd_ipv6, key_ipv6, &value) == 0);
assert(bpf_map_lookup_elem(map_fd_ipv6, key_ipv6, &value) == 0);
assert(value == 0xdeadbeef);

/* Test some lookups that should not match any entry */
inet_pton(AF_INET, "10.0.0.1", key_ipv4->data);
assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == -1 &&
assert(bpf_map_lookup_elem(map_fd_ipv4, key_ipv4, &value) == -1 &&
errno == ENOENT);

inet_pton(AF_INET, "11.11.11.11", key_ipv4->data);
assert(bpf_map_lookup(map_fd_ipv4, key_ipv4, &value) == -1 &&
assert(bpf_map_lookup_elem(map_fd_ipv4, key_ipv4, &value) == -1 &&
errno == ENOENT);

inet_pton(AF_INET6, "2a00:ffff::", key_ipv6->data);
assert(bpf_map_lookup(map_fd_ipv6, key_ipv6, &value) == -1 &&
assert(bpf_map_lookup_elem(map_fd_ipv6, key_ipv6, &value) == -1 &&
errno == ENOENT);

close(map_fd_ipv4);
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28 changes: 14 additions & 14 deletions tools/testing/selftests/bpf/test_lru_map.c
Original file line number Diff line number Diff line change
Expand Up @@ -47,8 +47,8 @@ static int map_subset(int map0, int map1)
int ret;

while (!bpf_map_next_key(map1, &next_key, &next_key)) {
assert(!bpf_map_lookup(map1, &next_key, value1));
ret = bpf_map_lookup(map0, &next_key, value0);
assert(!bpf_map_lookup_elem(map1, &next_key, value1));
ret = bpf_map_lookup_elem(map0, &next_key, value0);
if (ret) {
printf("key:%llu not found from map. %s(%d)\n",
next_key, strerror(errno), errno);
Expand Down Expand Up @@ -136,7 +136,7 @@ static void test_lru_sanity0(int map_type, int map_flags)

/* check that key=2 is not found */
key = 2;
assert(bpf_map_lookup(lru_map_fd, &key, value) == -1 &&
assert(bpf_map_lookup_elem(lru_map_fd, &key, value) == -1 &&
errno == ENOENT);

/* BPF_EXIST means: update existing element */
Expand All @@ -150,14 +150,14 @@ static void test_lru_sanity0(int map_type, int map_flags)

/* check that key=3 is not found */
key = 3;
assert(bpf_map_lookup(lru_map_fd, &key, value) == -1 &&
assert(bpf_map_lookup_elem(lru_map_fd, &key, value) == -1 &&
errno == ENOENT);

/* check that key=1 can be found and mark the ref bit to
* stop LRU from removing key=1
*/
key = 1;
assert(!bpf_map_lookup(lru_map_fd, &key, value));
assert(!bpf_map_lookup_elem(lru_map_fd, &key, value));
assert(value[0] == 1234);

key = 3;
Expand All @@ -167,7 +167,7 @@ static void test_lru_sanity0(int map_type, int map_flags)

/* key=2 has been removed from the LRU */
key = 2;
assert(bpf_map_lookup(lru_map_fd, &key, value) == -1);
assert(bpf_map_lookup_elem(lru_map_fd, &key, value) == -1);

assert(map_equal(lru_map_fd, expected_map_fd));

Expand Down Expand Up @@ -226,7 +226,7 @@ static void test_lru_sanity1(int map_type, int map_flags, unsigned int tgt_free)
/* Lookup 1 to tgt_free/2 */
end_key = 1 + batch_size;
for (key = 1; key < end_key; key++) {
assert(!bpf_map_lookup(lru_map_fd, &key, value));
assert(!bpf_map_lookup_elem(lru_map_fd, &key, value));
assert(!bpf_map_update_elem(expected_map_fd, &key, value,
BPF_NOEXIST));
}
Expand Down Expand Up @@ -336,10 +336,10 @@ static void test_lru_sanity2(int map_type, int map_flags, unsigned int tgt_free)
end_key = 1 + batch_size;
value[0] = 4321;
for (key = 1; key < end_key; key++) {
assert(bpf_map_lookup(lru_map_fd, &key, value));
assert(bpf_map_lookup_elem(lru_map_fd, &key, value));
assert(!bpf_map_update_elem(lru_map_fd, &key, value,
BPF_NOEXIST));
assert(!bpf_map_lookup(lru_map_fd, &key, value));
assert(!bpf_map_lookup_elem(lru_map_fd, &key, value));
assert(value[0] == 4321);
assert(!bpf_map_update_elem(expected_map_fd, &key, value,
BPF_NOEXIST));
Expand Down Expand Up @@ -418,7 +418,7 @@ static void test_lru_sanity3(int map_type, int map_flags, unsigned int tgt_free)
/* Lookup key 1 to tgt_free*3/2 */
end_key = tgt_free + batch_size;
for (key = 1; key < end_key; key++) {
assert(!bpf_map_lookup(lru_map_fd, &key, value));
assert(!bpf_map_lookup_elem(lru_map_fd, &key, value));
assert(!bpf_map_update_elem(expected_map_fd, &key, value,
BPF_NOEXIST));
}
Expand Down Expand Up @@ -477,7 +477,7 @@ static void test_lru_sanity4(int map_type, int map_flags, unsigned int tgt_free)
assert(bpf_map_update_elem(lru_map_fd, &key, value, BPF_NOEXIST));

for (key = 1; key <= tgt_free; key++) {
assert(!bpf_map_lookup(lru_map_fd, &key, value));
assert(!bpf_map_lookup_elem(lru_map_fd, &key, value));
assert(!bpf_map_update_elem(expected_map_fd, &key, value,
BPF_NOEXIST));
}
Expand Down Expand Up @@ -508,16 +508,16 @@ static void do_test_lru_sanity5(unsigned long long last_key, int map_fd)
unsigned long long key, value[nr_cpus];

/* Ensure the last key inserted by previous CPU can be found */
assert(!bpf_map_lookup(map_fd, &last_key, value));
assert(!bpf_map_lookup_elem(map_fd, &last_key, value));

value[0] = 1234;

key = last_key + 1;
assert(!bpf_map_update_elem(map_fd, &key, value, BPF_NOEXIST));
assert(!bpf_map_lookup(map_fd, &key, value));
assert(!bpf_map_lookup_elem(map_fd, &key, value));

/* Cannot find the last key because it was removed by LRU */
assert(bpf_map_lookup(map_fd, &last_key, value));
assert(bpf_map_lookup_elem(map_fd, &last_key, value));
}

/* Test map with only one element */
Expand Down
30 changes: 15 additions & 15 deletions tools/testing/selftests/bpf/test_maps.c
Original file line number Diff line number Diff line change
Expand Up @@ -55,11 +55,11 @@ static void test_hashmap(int task, void *data)
errno == EINVAL);

/* Check that key=1 can be found. */
assert(bpf_map_lookup(fd, &key, &value) == 0 && value == 1234);
assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 1234);

key = 2;
/* Check that key=2 is not found. */
assert(bpf_map_lookup(fd, &key, &value) == -1 && errno == ENOENT);
assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);

/* BPF_EXIST means update existing element. */
assert(bpf_map_update_elem(fd, &key, &value, BPF_EXIST) == -1 &&
Expand Down Expand Up @@ -148,11 +148,11 @@ static void test_hashmap_percpu(int task, void *data)
* was run from a different CPU.
*/
value[0] = 1;
assert(bpf_map_lookup(fd, &key, value) == 0 && value[0] == 100);
assert(bpf_map_lookup_elem(fd, &key, value) == 0 && value[0] == 100);

key = 2;
/* Check that key=2 is not found. */
assert(bpf_map_lookup(fd, &key, value) == -1 && errno == ENOENT);
assert(bpf_map_lookup_elem(fd, &key, value) == -1 && errno == ENOENT);

/* BPF_EXIST means update existing element. */
assert(bpf_map_update_elem(fd, &key, value, BPF_EXIST) == -1 &&
Expand All @@ -179,7 +179,7 @@ static void test_hashmap_percpu(int task, void *data)
assert((expected_key_mask & next_key) == next_key);
expected_key_mask &= ~next_key;

assert(bpf_map_lookup(fd, &next_key, value) == 0);
assert(bpf_map_lookup_elem(fd, &next_key, value) == 0);

for (i = 0; i < nr_cpus; i++)
assert(value[i] == i + 100);
Expand Down Expand Up @@ -229,11 +229,11 @@ static void test_arraymap(int task, void *data)
errno == EEXIST);

/* Check that key=1 can be found. */
assert(bpf_map_lookup(fd, &key, &value) == 0 && value == 1234);
assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 1234);

key = 0;
/* Check that key=0 is also found and zero initialized. */
assert(bpf_map_lookup(fd, &key, &value) == 0 && value == 0);
assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 0);

/* key=0 and key=1 were inserted, check that key=2 cannot be inserted
* due to max_entries limit.
Expand All @@ -243,7 +243,7 @@ static void test_arraymap(int task, void *data)
errno == E2BIG);

/* Check that key = 2 doesn't exist. */
assert(bpf_map_lookup(fd, &key, &value) == -1 && errno == ENOENT);
assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);

/* Iterate over two elements. */
assert(bpf_map_next_key(fd, &key, &next_key) == 0 &&
Expand Down Expand Up @@ -285,11 +285,11 @@ static void test_arraymap_percpu(int task, void *data)
errno == EEXIST);

/* Check that key=1 can be found. */
assert(bpf_map_lookup(fd, &key, values) == 0 && values[0] == 100);
assert(bpf_map_lookup_elem(fd, &key, values) == 0 && values[0] == 100);

key = 0;
/* Check that key=0 is also found and zero initialized. */
assert(bpf_map_lookup(fd, &key, values) == 0 &&
assert(bpf_map_lookup_elem(fd, &key, values) == 0 &&
values[0] == 0 && values[nr_cpus - 1] == 0);

/* Check that key=2 cannot be inserted due to max_entries limit. */
Expand All @@ -298,7 +298,7 @@ static void test_arraymap_percpu(int task, void *data)
errno == E2BIG);

/* Check that key = 2 doesn't exist. */
assert(bpf_map_lookup(fd, &key, values) == -1 && errno == ENOENT);
assert(bpf_map_lookup_elem(fd, &key, values) == -1 && errno == ENOENT);

/* Iterate over two elements. */
assert(bpf_map_next_key(fd, &key, &next_key) == 0 &&
Expand Down Expand Up @@ -340,7 +340,7 @@ static void test_arraymap_percpu_many_keys(void)
for (i = 0; i < nr_cpus; i++)
values[i] = 0;

assert(bpf_map_lookup(fd, &key, values) == 0);
assert(bpf_map_lookup_elem(fd, &key, values) == 0);

for (i = 0; i < nr_cpus; i++)
assert(values[i] == i + 10);
Expand Down Expand Up @@ -384,9 +384,9 @@ static void test_map_large(void)
assert(bpf_map_next_key(fd, &key, &key) == -1 && errno == ENOENT);

key.c = 0;
assert(bpf_map_lookup(fd, &key, &value) == 0 && value == 0);
assert(bpf_map_lookup_elem(fd, &key, &value) == 0 && value == 0);
key.a = 1;
assert(bpf_map_lookup(fd, &key, &value) == -1 && errno == ENOENT);
assert(bpf_map_lookup_elem(fd, &key, &value) == -1 && errno == ENOENT);

close(fd);
}
Expand Down Expand Up @@ -486,7 +486,7 @@ static void test_map_parallel(void)
for (i = 0; i < MAP_SIZE; i++) {
key = MAP_SIZE - i - 1;

assert(bpf_map_lookup(fd, &key, &value) == 0 &&
assert(bpf_map_lookup_elem(fd, &key, &value) == 0 &&
value == key);
}

Expand Down

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