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tools/bpf: add bpffs percpu map pretty print tests in test_btf 

The bpf selftest test_btf is extended to test bpffs
percpu map pretty print for percpu array, percpu hash and
percpu lru hash.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Yonghong Song 2018-08-29 14:43:14 -07:00 committed by Daniel Borkmann
parent c7b27c37af
commit 6493ebf724
1 changed files with 143 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

177
tools/testing/selftests/bpf/test_btf.c
View File

@ -4,6 +4,7 @@
#include <linux/bpf.h>
#include <linux/btf.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <bpf/bpf.h>
#include <sys/resource.h>
#include <libelf.h>
@ -45,7 +46,6 @@ static int count_result(int err)
return err;
}
#define min(a, b) ((a) < (b) ? (a) : (b))
#define __printf(a, b) __attribute__((format(printf, a, b)))
__printf(1, 2)
@ -130,6 +130,7 @@ struct btf_raw_test {
bool map_create_err;
bool ordered_map;
bool lossless_map;
bool percpu_map;
int hdr_len_delta;
int type_off_delta;
int str_off_delta;
@ -2157,6 +2158,7 @@ static struct btf_pprint_test_meta {
const char *map_name;
bool ordered_map;
bool lossless_map;
bool percpu_map;
} pprint_tests_meta[] = {
{
.descr = "BTF pretty print array",
@ -2164,6 +2166,7 @@ static struct btf_pprint_test_meta {
.map_name = "pprint_test_array",
.ordered_map = true,
.lossless_map = true,
.percpu_map = false,
},
{
@ -2172,6 +2175,7 @@ static struct btf_pprint_test_meta {
.map_name = "pprint_test_hash",
.ordered_map = false,
.lossless_map = true,
.percpu_map = false,
},
{
@ -2180,30 +2184,83 @@ static struct btf_pprint_test_meta {
.map_name = "pprint_test_lru_hash",
.ordered_map = false,
.lossless_map = false,
.percpu_map = false,
},
{
.descr = "BTF pretty print percpu array",
.map_type = BPF_MAP_TYPE_PERCPU_ARRAY,
.map_name = "pprint_test_percpu_array",
.ordered_map = true,
.lossless_map = true,
.percpu_map = true,
},
{
.descr = "BTF pretty print percpu hash",
.map_type = BPF_MAP_TYPE_PERCPU_HASH,
.map_name = "pprint_test_percpu_hash",
.ordered_map = false,
.lossless_map = true,
.percpu_map = true,
},
{
.descr = "BTF pretty print lru percpu hash",
.map_type = BPF_MAP_TYPE_LRU_PERCPU_HASH,
.map_name = "pprint_test_lru_percpu_hash",
.ordered_map = false,
.lossless_map = false,
.percpu_map = true,
},
};
static void set_pprint_mapv(struct pprint_mapv *v, uint32_t i)
static void set_pprint_mapv(struct pprint_mapv *v, uint32_t i,
int num_cpus, int rounded_value_size)
{
v->ui32 = i;
v->si32 = -i;
v->unused_bits2a = 3;
v->bits28 = i;
v->unused_bits2b = 3;
v->ui64 = i;
v->aenum = i & 0x03;
int cpu;
for (cpu = 0; cpu < num_cpus; cpu++) {
v->ui32 = i + cpu;
v->si32 = -i;
v->unused_bits2a = 3;
v->bits28 = i;
v->unused_bits2b = 3;
v->ui64 = i;
v->aenum = i & 0x03;
v = (void *)v + rounded_value_size;
}
}
static int check_line(const char *expected_line, int nexpected_line,
int expected_line_len, const char *line)
{
if (CHECK(nexpected_line == expected_line_len,
"expected_line is too long"))
return -1;
if (strcmp(expected_line, line)) {
fprintf(stderr, "unexpected pprint output\n");
fprintf(stderr, "expected: %s", expected_line);
fprintf(stderr, " read: %s", line);
return -1;
}
return 0;
}
static int do_test_pprint(void)
{
const struct btf_raw_test *test = &pprint_test_template;
struct bpf_create_map_attr create_attr = {};
bool ordered_map, lossless_map, percpu_map;
int err, ret, num_cpus, rounded_value_size;
struct pprint_mapv *mapv = NULL;
unsigned int key, nr_read_elems;
bool ordered_map, lossless_map;
int map_fd = -1, btf_fd = -1;
struct pprint_mapv mapv = {};
unsigned int raw_btf_size;
char expected_line[255];
FILE *pin_file = NULL;
@ -2212,7 +2269,6 @@ static int do_test_pprint(void)
char *line = NULL;
uint8_t *raw_btf;
ssize_t nread;
int err, ret;
fprintf(stderr, "%s......", test->descr);
raw_btf = btf_raw_create(&hdr_tmpl, test->raw_types,
@ -2261,9 +2317,18 @@ static int do_test_pprint(void)
if (CHECK(err, "bpf_obj_pin(%s): errno:%d.", pin_path, errno))
goto done;
percpu_map = test->percpu_map;
num_cpus = percpu_map ? bpf_num_possible_cpus() : 1;
rounded_value_size = round_up(sizeof(struct pprint_mapv), 8);
mapv = calloc(num_cpus, rounded_value_size);
if (CHECK(!mapv, "mapv allocation failure")) {
err = -1;
goto done;
}
for (key = 0; key < test->max_entries; key++) {
set_pprint_mapv(&mapv, key);
bpf_map_update_elem(map_fd, &key, &mapv, 0);
set_pprint_mapv(mapv, key, num_cpus, rounded_value_size);
bpf_map_update_elem(map_fd, &key, mapv, 0);
}
pin_file = fopen(pin_path, "r");
@ -2286,33 +2351,74 @@ static int do_test_pprint(void)
ordered_map = test->ordered_map;
lossless_map = test->lossless_map;
do {
struct pprint_mapv *cmapv;
ssize_t nexpected_line;
unsigned int next_key;
int cpu;
next_key = ordered_map ? nr_read_elems : atoi(line);
set_pprint_mapv(&mapv, next_key);
nexpected_line = snprintf(expected_line, sizeof(expected_line),
"%u: {%u,0,%d,0x%x,0x%x,0x%x,{%lu|[%u,%u,%u,%u,%u,%u,%u,%u]},%s}\n",
next_key,
mapv.ui32, mapv.si32,
mapv.unused_bits2a, mapv.bits28, mapv.unused_bits2b,
mapv.ui64,
mapv.ui8a[0], mapv.ui8a[1], mapv.ui8a[2], mapv.ui8a[3],
mapv.ui8a[4], mapv.ui8a[5], mapv.ui8a[6], mapv.ui8a[7],
pprint_enum_str[mapv.aenum]);
set_pprint_mapv(mapv, next_key, num_cpus, rounded_value_size);
cmapv = mapv;
if (CHECK(nexpected_line == sizeof(expected_line),
"expected_line is too long")) {
err = -1;
goto done;
for (cpu = 0; cpu < num_cpus; cpu++) {
if (percpu_map) {
/* for percpu map, the format looks like:
* <key>: {
* cpu0: <value_on_cpu0>
* cpu1: <value_on_cpu1>
* ...
* cpun: <value_on_cpun>
* }
*
* let us verify the line containing the key here.
*/
if (cpu == 0) {
nexpected_line = snprintf(expected_line,
sizeof(expected_line),
"%u: {\n",
next_key);
err = check_line(expected_line, nexpected_line,
sizeof(expected_line), line);
if (err == -1)
goto done;
}
/* read value@cpu */
nread = getline(&line, &line_len, pin_file);
if (nread < 0)
break;
}
nexpected_line = snprintf(expected_line, sizeof(expected_line),
"%s%u: {%u,0,%d,0x%x,0x%x,0x%x,"
"{%lu|[%u,%u,%u,%u,%u,%u,%u,%u]},%s}\n",
percpu_map ? "\tcpu" : "",
percpu_map ? cpu : next_key,
cmapv->ui32, cmapv->si32,
cmapv->unused_bits2a,
cmapv->bits28,
cmapv->unused_bits2b,
cmapv->ui64,
cmapv->ui8a[0], cmapv->ui8a[1],
cmapv->ui8a[2], cmapv->ui8a[3],
cmapv->ui8a[4], cmapv->ui8a[5],
cmapv->ui8a[6], cmapv->ui8a[7],
pprint_enum_str[cmapv->aenum]);
err = check_line(expected_line, nexpected_line,
sizeof(expected_line), line);
if (err == -1)
goto done;
cmapv = (void *)cmapv + rounded_value_size;
}
if (strcmp(expected_line, line)) {
err = -1;
fprintf(stderr, "unexpected pprint output\n");
fprintf(stderr, "expected: %s", expected_line);
fprintf(stderr, " read: %s", line);
goto done;
if (percpu_map) {
/* skip the last bracket for the percpu map */
nread = getline(&line, &line_len, pin_file);
if (nread < 0)
break;
}
nread = getline(&line, &line_len, pin_file);
@ -2334,6 +2440,8 @@ static int do_test_pprint(void)
err = 0;
done:
if (mapv)
free(mapv);
if (!err)
fprintf(stderr, "OK");
if (*btf_log_buf && (err || args.always_log))
@ -2361,6 +2469,7 @@ static int test_pprint(void)
pprint_test_template.map_name = pprint_tests_meta[i].map_name;
pprint_test_template.ordered_map = pprint_tests_meta[i].ordered_map;
pprint_test_template.lossless_map = pprint_tests_meta[i].lossless_map;
pprint_test_template.percpu_map = pprint_tests_meta[i].percpu_map;
err |= count_result(do_test_pprint());
}