Software event output is only enabled by a few prog types right now (TC,
LWT out, XDP, sockops). Many other skb based prog types need
bpf_skb_event_output to produce software event.
More prog types are enabled to access bpf_skb_event_output in this
patch.
v7 changes:
Reformat from hints by scripts/checkpatch.pl, including Song's comment
on signed-off-by name to captical case in cover letter.
3 of hints are ignored:
1. new file mode.
2. SPDX-License-Identifier for event_output.c since all files under
this dir have no such line.
3. "Macros ... enclosed in parentheses" for macro in event_output.c
due to code's nature.
Change patch 02 subject "bpf:..." to "selftests/bpf:..."
v6 changes:
Fix Signed-off-by, fix fixup map creation.
v5 changes:
Fix typos, reformat comments in event_output.c, move revision history to
cover letter.
v4 changes:
Reformating log message.
v3 changes:
Reformating log message.
v2 changes:
Reformating log message.
Allan Zhang (2):
bpf: Allow bpf_skb_event_output for a few prog types
selftests/bpf: Add selftests for bpf_perf_event_output
net/core/filter.c | 6 ++
tools/testing/selftests/bpf/test_verifier.c | 12 ++-
.../selftests/bpf/verifier/event_output.c | 94 +++++++++++++++++++
3 files changed, 111 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/bpf/verifier/event_output.c
--
2.22.0.410.gd8fdbe21b5-goog
From: allanzhang <[email protected]>
Software event output is only enabled by a few prog types right now (TC,
LWT out, XDP, sockops). Many other skb based prog types need
bpf_skb_event_output to produce software event.
Added socket_filter, cg_skb, sk_skb prog types to generate sw event.
Test bpf code is generated 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
Signed-off-by: Allan Zhang <[email protected]>
---
net/core/filter.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index 2014d76e0d2a..b75fcf412628 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5958,6 +5958,8 @@ sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_get_socket_cookie_proto;
case BPF_FUNC_get_socket_uid:
return &bpf_get_socket_uid_proto;
+ case BPF_FUNC_perf_event_output:
+ return &bpf_skb_event_output_proto;
default:
return bpf_base_func_proto(func_id);
}
@@ -5978,6 +5980,8 @@ cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_sk_storage_get_proto;
case BPF_FUNC_sk_storage_delete:
return &bpf_sk_storage_delete_proto;
+ case BPF_FUNC_perf_event_output:
+ return &bpf_skb_event_output_proto;
#ifdef CONFIG_SOCK_CGROUP_DATA
case BPF_FUNC_skb_cgroup_id:
return &bpf_skb_cgroup_id_proto;
@@ -6226,6 +6230,8 @@ sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_sk_redirect_map_proto;
case BPF_FUNC_sk_redirect_hash:
return &bpf_sk_redirect_hash_proto;
+ case BPF_FUNC_perf_event_output:
+ return &bpf_skb_event_output_proto;
#ifdef CONFIG_INET
case BPF_FUNC_sk_lookup_tcp:
return &bpf_sk_lookup_tcp_proto;
--
2.22.0.410.gd8fdbe21b5-goog
From: allanzhang <[email protected]>
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 <[email protected]>
---
tools/testing/selftests/bpf/test_verifier.c | 12 ++-
.../selftests/bpf/verifier/event_output.c | 94 +++++++++++++++++++
2 files changed, 105 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/bpf/verifier/event_output.c
diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
index c5514daf8865..5e98d7c37eb7 100644
--- a/tools/testing/selftests/bpf/test_verifier.c
+++ b/tools/testing/selftests/bpf/test_verifier.c
@@ -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 retval, retval_unpriv, insn_processed;
@@ -627,6 +628,7 @@ 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));
@@ -788,6 +790,14 @@ 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)
diff --git a/tools/testing/selftests/bpf/verifier/event_output.c b/tools/testing/selftests/bpf/verifier/event_output.c
new file mode 100644
index 000000000000..130553e19eca
--- /dev/null
+++ b/tools/testing/selftests/bpf/verifier/event_output.c
@@ -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,
+},
--
2.22.0.410.gd8fdbe21b5-goog
> On Jun 26, 2019, at 4:58 PM, Allan Zhang <[email protected]> wrote:
>
> From: allanzhang <[email protected]>
>
> Software event output is only enabled by a few prog types right now (TC,
> LWT out, XDP, sockops). Many other skb based prog types need
> bpf_skb_event_output to produce software event.
>
> Added socket_filter, cg_skb, sk_skb prog types to generate sw event.
>
> Test bpf code is generated 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
>
> Signed-off-by: Allan Zhang <[email protected]>
Acked-by: Song Liu <[email protected]>
> ---
> net/core/filter.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/net/core/filter.c b/net/core/filter.c
> index 2014d76e0d2a..b75fcf412628 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -5958,6 +5958,8 @@ sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> return &bpf_get_socket_cookie_proto;
> case BPF_FUNC_get_socket_uid:
> return &bpf_get_socket_uid_proto;
> + case BPF_FUNC_perf_event_output:
> + return &bpf_skb_event_output_proto;
> default:
> return bpf_base_func_proto(func_id);
> }
> @@ -5978,6 +5980,8 @@ cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> return &bpf_sk_storage_get_proto;
> case BPF_FUNC_sk_storage_delete:
> return &bpf_sk_storage_delete_proto;
> + case BPF_FUNC_perf_event_output:
> + return &bpf_skb_event_output_proto;
> #ifdef CONFIG_SOCK_CGROUP_DATA
> case BPF_FUNC_skb_cgroup_id:
> return &bpf_skb_cgroup_id_proto;
> @@ -6226,6 +6230,8 @@ sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
> return &bpf_sk_redirect_map_proto;
> case BPF_FUNC_sk_redirect_hash:
> return &bpf_sk_redirect_hash_proto;
> + case BPF_FUNC_perf_event_output:
> + return &bpf_skb_event_output_proto;
> #ifdef CONFIG_INET
> case BPF_FUNC_sk_lookup_tcp:
> return &bpf_sk_lookup_tcp_proto;
> --
> 2.22.0.410.gd8fdbe21b5-goog
>
> On Jun 26, 2019, at 4:58 PM, Allan Zhang <[email protected]> wrote:
>
> From: allanzhang <[email protected]>
>
> 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 <[email protected]>
Acked-by: Song Liu <[email protected]>
> ---
> tools/testing/selftests/bpf/test_verifier.c | 12 ++-
> .../selftests/bpf/verifier/event_output.c | 94 +++++++++++++++++++
> 2 files changed, 105 insertions(+), 1 deletion(-)
> create mode 100644 tools/testing/selftests/bpf/verifier/event_output.c
>
> diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
> index c5514daf8865..5e98d7c37eb7 100644
> --- a/tools/testing/selftests/bpf/test_verifier.c
> +++ b/tools/testing/selftests/bpf/test_verifier.c
> @@ -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 retval, retval_unpriv, insn_processed;
> @@ -627,6 +628,7 @@ 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));
> @@ -788,6 +790,14 @@ 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)
> diff --git a/tools/testing/selftests/bpf/verifier/event_output.c b/tools/testing/selftests/bpf/verifier/event_output.c
> new file mode 100644
> index 000000000000..130553e19eca
> --- /dev/null
> +++ b/tools/testing/selftests/bpf/verifier/event_output.c
> @@ -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,
> +},
> --
> 2.22.0.410.gd8fdbe21b5-goog
>