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bpf, testing: Add various tail call test cases

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Add several BPF kselftest cases for tail calls which test the various
patch directions, and that multiple locations are patched in same and
different programs.

  # ./test_progs -n 45
   #45/1 tailcall_1:OK
   #45/2 tailcall_2:OK
   #45/3 tailcall_3:OK
   #45/4 tailcall_4:OK
   #45/5 tailcall_5:OK
   #45 tailcalls:OK
  Summary: 1/5 PASSED, 0 SKIPPED, 0 FAILED

I've also verified the JITed dump after each of the rewrite cases that
it matches expectations.

Also regular test_verifier suite passes fine which contains further tail
call tests:

  # ./test_verifier
  [...]
  Summary: 1563 PASSED, 0 SKIPPED, 0 FAILED

Checked under JIT, interpreter and JIT + hardening.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/3d6cbecbeb171117dccfe153306e479798fb608d.1574452833.git.daniel@iogearbox.net
This commit is contained in:
Daniel Borkmann
2019-11-22 21:08:01 +01:00
committed by Alexei Starovoitov
parent 428d5df1fa
commit 79d49ba048
6 changed files with 698 additions and 0 deletions
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33
tools/testing/selftests/bpf/progs/tailcall4.c Normal file
View File

@@ -0,0 +1,33 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include "bpf_helpers.h"
struct {
__uint(type, BPF_MAP_TYPE_PROG_ARRAY);
__uint(max_entries, 3);
__uint(key_size, sizeof(__u32));
__uint(value_size, sizeof(__u32));
} jmp_table SEC(".maps");
static volatile int selector;
#define TAIL_FUNC(x) \
SEC("classifier/" #x) \
int bpf_func_##x(struct __sk_buff *skb) \
{ \
return x; \
}
TAIL_FUNC(0)
TAIL_FUNC(1)
TAIL_FUNC(2)
SEC("classifier")
int entry(struct __sk_buff *skb)
{
bpf_tail_call(skb, &jmp_table, selector);
return 3;
}
char __license[] SEC("license") = "GPL";
int _version SEC("version") = 1;