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selftests/bpf: Add selftests for bpf_perf_event_output 

Software event output is only enabled by a few prog types.
This test is to ensure that all supported types are enabled for
bpf_perf_event_output successfully.

Signed-off-by: Allan Zhang <allanzhang@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Allan Zhang 2019-07-23 17:07:25 -07:00 committed by Alexei Starovoitov
parent 7c4b90d79d
commit 03cd1d1a49
2 changed files with 105 additions and 1 deletions
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12
tools/testing/selftests/bpf/test_verifier.c
View File

@ -50,7 +50,7 @@
#define MAX_INSNS BPF_MAXINSNS
#define MAX_TEST_INSNS 1000000
#define MAX_FIXUPS 8
#define MAX_NR_MAPS 18
#define MAX_NR_MAPS 19
#define MAX_TEST_RUNS 8
#define POINTER_VALUE 0xcafe4all
#define TEST_DATA_LEN 64
@ -84,6 +84,7 @@ struct bpf_test {
int fixup_map_array_wo[MAX_FIXUPS];
int fixup_map_array_small[MAX_FIXUPS];
int fixup_sk_storage_map[MAX_FIXUPS];
int fixup_map_event_output[MAX_FIXUPS];
const char *errstr;
const char *errstr_unpriv;
uint32_t insn_processed;
@ -632,6 +633,7 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
int *fixup_map_array_wo = test->fixup_map_array_wo;
int *fixup_map_array_small = test->fixup_map_array_small;
int *fixup_sk_storage_map = test->fixup_sk_storage_map;
int *fixup_map_event_output = test->fixup_map_event_output;
if (test->fill_helper) {
test->fill_insns = calloc(MAX_TEST_INSNS, sizeof(struct bpf_insn));
@ -793,6 +795,14 @@ static void do_test_fixup(struct bpf_test *test, enum bpf_prog_type prog_type,
fixup_sk_storage_map++;
} while (*fixup_sk_storage_map);
}
if (*fixup_map_event_output) {
map_fds[18] = __create_map(BPF_MAP_TYPE_PERF_EVENT_ARRAY,
sizeof(int), sizeof(int), 1, 0);
do {
prog[*fixup_map_event_output].imm = map_fds[18];
fixup_map_event_output++;
} while (*fixup_map_event_output);
}
}
static int set_admin(bool admin)

94
tools/testing/selftests/bpf/verifier/event_output.c Normal file
View File

@ -0,0 +1,94 @@
/* instructions used to output a skb based software event, produced
* from code snippet:
* struct TMP {
* uint64_t tmp;
* } tt;
* tt.tmp = 5;
* bpf_perf_event_output(skb, &connection_tracking_event_map, 0,
* &tt, sizeof(tt));
* return 1;
*
* the bpf assembly from llvm is:
* 0: b7 02 00 00 05 00 00 00 r2 = 5
* 1: 7b 2a f8 ff 00 00 00 00 *(u64 *)(r10 - 8) = r2
* 2: bf a4 00 00 00 00 00 00 r4 = r10
* 3: 07 04 00 00 f8 ff ff ff r4 += -8
* 4: 18 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 r2 = 0ll
* 6: b7 03 00 00 00 00 00 00 r3 = 0
* 7: b7 05 00 00 08 00 00 00 r5 = 8
* 8: 85 00 00 00 19 00 00 00 call 25
* 9: b7 00 00 00 01 00 00 00 r0 = 1
* 10: 95 00 00 00 00 00 00 00 exit
*
* The reason I put the code here instead of fill_helpers is that map fixup
* is against the insns, instead of filled prog.
*/
#define __PERF_EVENT_INSNS__ \
BPF_MOV64_IMM(BPF_REG_2, 5), \
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_2, -8), \
BPF_MOV64_REG(BPF_REG_4, BPF_REG_10), \
BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, -8), \
BPF_LD_MAP_FD(BPF_REG_2, 0), \
BPF_MOV64_IMM(BPF_REG_3, 0), \
BPF_MOV64_IMM(BPF_REG_5, 8), \
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, \
BPF_FUNC_perf_event_output), \
BPF_MOV64_IMM(BPF_REG_0, 1), \
BPF_EXIT_INSN(),
{
"perfevent for sockops",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_SOCK_OPS,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for tc",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_SCHED_CLS,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for lwt out",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_LWT_OUT,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for xdp",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_XDP,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for socket filter",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for sk_skb",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_SK_SKB,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for cgroup skb",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},