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bpf, tests: Add tests for BPF_CMPXCHG 

Tests for BPF_CMPXCHG with both word and double word operands. As with
the tests for other atomic operations, these tests only check the result
of the arithmetic operation. The atomicity of the operations is not tested.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210809091829.810076-14-johan.almbladh@anyfinetworks.com
This commit is contained in:
Johan Almbladh 2021-08-09 11:18:28 +02:00 committed by Daniel Borkmann
parent e4517b3637
commit 6a3b24ca48
1 changed files with 166 additions and 0 deletions
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166
lib/test_bpf.c
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@ -5690,6 +5690,172 @@ static struct bpf_test tests[] = {
#undef BPF_ATOMIC_OP_TEST2
#undef BPF_ATOMIC_OP_TEST3
#undef BPF_ATOMIC_OP_TEST4
/* BPF_ATOMIC | BPF_W, BPF_CMPXCHG */
{
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful return",
.u.insns_int = {
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0x01234567 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful store",
.u.insns_int = {
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
BPF_LDX_MEM(BPF_W, R0, R10, -40),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0x89abcdef } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test failure return",
.u.insns_int = {
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R0, 0x76543210),
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0x01234567 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test failure store",
.u.insns_int = {
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R0, 0x76543210),
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
BPF_LDX_MEM(BPF_W, R0, R10, -40),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0x01234567 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test side effects",
.u.insns_int = {
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
BPF_ALU32_REG(BPF_MOV, R0, R3),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0x89abcdef } },
.stack_depth = 40,
},
/* BPF_ATOMIC | BPF_DW, BPF_CMPXCHG */
{
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test successful return",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
BPF_ALU64_REG(BPF_MOV, R0, R1),
BPF_STX_MEM(BPF_DW, R10, R1, -40),
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
BPF_JMP_REG(BPF_JNE, R0, R1, 1),
BPF_ALU64_REG(BPF_SUB, R0, R1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test successful store",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
BPF_ALU64_REG(BPF_MOV, R0, R1),
BPF_STX_MEM(BPF_DW, R10, R0, -40),
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
BPF_LDX_MEM(BPF_DW, R0, R10, -40),
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_REG(BPF_SUB, R0, R2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test failure return",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
BPF_ALU64_REG(BPF_MOV, R0, R1),
BPF_ALU64_IMM(BPF_ADD, R0, 1),
BPF_STX_MEM(BPF_DW, R10, R1, -40),
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
BPF_JMP_REG(BPF_JNE, R0, R1, 1),
BPF_ALU64_REG(BPF_SUB, R0, R1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test failure store",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
BPF_ALU64_REG(BPF_MOV, R0, R1),
BPF_ALU64_IMM(BPF_ADD, R0, 1),
BPF_STX_MEM(BPF_DW, R10, R1, -40),
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
BPF_LDX_MEM(BPF_DW, R0, R10, -40),
BPF_JMP_REG(BPF_JNE, R0, R1, 1),
BPF_ALU64_REG(BPF_SUB, R0, R1),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 40,
},
{
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test side effects",
.u.insns_int = {
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
BPF_ALU64_REG(BPF_MOV, R0, R1),
BPF_STX_MEM(BPF_DW, R10, R1, -40),
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
BPF_LD_IMM64(R0, 0xfecdba9876543210ULL),
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
BPF_ALU64_REG(BPF_SUB, R0, R2),
BPF_EXIT_INSN(),
},
INTERNAL,
{ },
{ { 0, 0 } },
.stack_depth = 40,
},
/* BPF_JMP32 | BPF_JEQ | BPF_K */
{
"JMP32_JEQ_K: Small immediate",