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test_bpf: Add a couple of tests for BPF_JSGE. 

Some JITs can optimize comparisons with zero.  Add a couple of
BPF_JSGE tests against immediate zero.

Signed-off-by: David Daney <david.daney@cavium.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Daney 2017-05-24 16:35:49 -07:00 committed by David S. Miller
parent ae08ea9768
commit 791caeb084
1 changed files with 38 additions and 0 deletions
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38
lib/test_bpf.c
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@ -4504,6 +4504,44 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 1 } },
},
{
"JMP_JSGE_K: Signed jump: value walk 1",
.u.insns_int = {
BPF_ALU32_IMM(BPF_MOV, R0, 0),
BPF_LD_IMM64(R1, -3),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 6),
BPF_ALU64_IMM(BPF_ADD, R1, 1),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 4),
BPF_ALU64_IMM(BPF_ADD, R1, 1),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 2),
BPF_ALU64_IMM(BPF_ADD, R1, 1),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 1),
BPF_EXIT_INSN(), /* bad exit */
BPF_ALU32_IMM(BPF_MOV, R0, 1), /* good exit */
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
{
"JMP_JSGE_K: Signed jump: value walk 2",
.u.insns_int = {
BPF_ALU32_IMM(BPF_MOV, R0, 0),
BPF_LD_IMM64(R1, -3),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 4),
BPF_ALU64_IMM(BPF_ADD, R1, 2),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 2),
BPF_ALU64_IMM(BPF_ADD, R1, 2),
BPF_JMP_IMM(BPF_JSGE, R1, 0, 1),
BPF_EXIT_INSN(), /* bad exit */
BPF_ALU32_IMM(BPF_MOV, R0, 1), /* good exit */
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 1 } },
},
/* BPF_JMP | BPF_JGT | BPF_K */
{
"JMP_JGT_K: if (3 > 2) return 1",