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Johan Almbladhborkmann
Johan Almbladh
authored and
borkmann
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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
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‎lib/test_bpf.c‎

Lines changed: 166 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -5690,6 +5690,172 @@ static struct bpf_test tests[] = {
56905690
#undef BPF_ATOMIC_OP_TEST2
56915691
#undef BPF_ATOMIC_OP_TEST3
56925692
#undef BPF_ATOMIC_OP_TEST4
5693+
/* BPF_ATOMIC | BPF_W, BPF_CMPXCHG */
5694+
{
5695+
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful return",
5696+
.u.insns_int = {
5697+
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
5698+
BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
5699+
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
5700+
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
5701+
BPF_EXIT_INSN(),
5702+
},
5703+
INTERNAL,
5704+
{ },
5705+
{ { 0, 0x01234567 } },
5706+
.stack_depth = 40,
5707+
},
5708+
{
5709+
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test successful store",
5710+
.u.insns_int = {
5711+
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
5712+
BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
5713+
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
5714+
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
5715+
BPF_LDX_MEM(BPF_W, R0, R10, -40),
5716+
BPF_EXIT_INSN(),
5717+
},
5718+
INTERNAL,
5719+
{ },
5720+
{ { 0, 0x89abcdef } },
5721+
.stack_depth = 40,
5722+
},
5723+
{
5724+
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test failure return",
5725+
.u.insns_int = {
5726+
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
5727+
BPF_ALU32_IMM(BPF_MOV, R0, 0x76543210),
5728+
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
5729+
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
5730+
BPF_EXIT_INSN(),
5731+
},
5732+
INTERNAL,
5733+
{ },
5734+
{ { 0, 0x01234567 } },
5735+
.stack_depth = 40,
5736+
},
5737+
{
5738+
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test failure store",
5739+
.u.insns_int = {
5740+
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
5741+
BPF_ALU32_IMM(BPF_MOV, R0, 0x76543210),
5742+
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
5743+
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
5744+
BPF_LDX_MEM(BPF_W, R0, R10, -40),
5745+
BPF_EXIT_INSN(),
5746+
},
5747+
INTERNAL,
5748+
{ },
5749+
{ { 0, 0x01234567 } },
5750+
.stack_depth = 40,
5751+
},
5752+
{
5753+
"BPF_ATOMIC | BPF_W, BPF_CMPXCHG: Test side effects",
5754+
.u.insns_int = {
5755+
BPF_ST_MEM(BPF_W, R10, -40, 0x01234567),
5756+
BPF_ALU32_IMM(BPF_MOV, R0, 0x01234567),
5757+
BPF_ALU32_IMM(BPF_MOV, R3, 0x89abcdef),
5758+
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
5759+
BPF_ATOMIC_OP(BPF_W, BPF_CMPXCHG, R10, R3, -40),
5760+
BPF_ALU32_REG(BPF_MOV, R0, R3),
5761+
BPF_EXIT_INSN(),
5762+
},
5763+
INTERNAL,
5764+
{ },
5765+
{ { 0, 0x89abcdef } },
5766+
.stack_depth = 40,
5767+
},
5768+
/* BPF_ATOMIC | BPF_DW, BPF_CMPXCHG */
5769+
{
5770+
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test successful return",
5771+
.u.insns_int = {
5772+
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
5773+
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
5774+
BPF_ALU64_REG(BPF_MOV, R0, R1),
5775+
BPF_STX_MEM(BPF_DW, R10, R1, -40),
5776+
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
5777+
BPF_JMP_REG(BPF_JNE, R0, R1, 1),
5778+
BPF_ALU64_REG(BPF_SUB, R0, R1),
5779+
BPF_EXIT_INSN(),
5780+
},
5781+
INTERNAL,
5782+
{ },
5783+
{ { 0, 0 } },
5784+
.stack_depth = 40,
5785+
},
5786+
{
5787+
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test successful store",
5788+
.u.insns_int = {
5789+
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
5790+
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
5791+
BPF_ALU64_REG(BPF_MOV, R0, R1),
5792+
BPF_STX_MEM(BPF_DW, R10, R0, -40),
5793+
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
5794+
BPF_LDX_MEM(BPF_DW, R0, R10, -40),
5795+
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
5796+
BPF_ALU64_REG(BPF_SUB, R0, R2),
5797+
BPF_EXIT_INSN(),
5798+
},
5799+
INTERNAL,
5800+
{ },
5801+
{ { 0, 0 } },
5802+
.stack_depth = 40,
5803+
},
5804+
{
5805+
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test failure return",
5806+
.u.insns_int = {
5807+
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
5808+
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
5809+
BPF_ALU64_REG(BPF_MOV, R0, R1),
5810+
BPF_ALU64_IMM(BPF_ADD, R0, 1),
5811+
BPF_STX_MEM(BPF_DW, R10, R1, -40),
5812+
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
5813+
BPF_JMP_REG(BPF_JNE, R0, R1, 1),
5814+
BPF_ALU64_REG(BPF_SUB, R0, R1),
5815+
BPF_EXIT_INSN(),
5816+
},
5817+
INTERNAL,
5818+
{ },
5819+
{ { 0, 0 } },
5820+
.stack_depth = 40,
5821+
},
5822+
{
5823+
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test failure store",
5824+
.u.insns_int = {
5825+
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
5826+
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
5827+
BPF_ALU64_REG(BPF_MOV, R0, R1),
5828+
BPF_ALU64_IMM(BPF_ADD, R0, 1),
5829+
BPF_STX_MEM(BPF_DW, R10, R1, -40),
5830+
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
5831+
BPF_LDX_MEM(BPF_DW, R0, R10, -40),
5832+
BPF_JMP_REG(BPF_JNE, R0, R1, 1),
5833+
BPF_ALU64_REG(BPF_SUB, R0, R1),
5834+
BPF_EXIT_INSN(),
5835+
},
5836+
INTERNAL,
5837+
{ },
5838+
{ { 0, 0 } },
5839+
.stack_depth = 40,
5840+
},
5841+
{
5842+
"BPF_ATOMIC | BPF_DW, BPF_CMPXCHG: Test side effects",
5843+
.u.insns_int = {
5844+
BPF_LD_IMM64(R1, 0x0123456789abcdefULL),
5845+
BPF_LD_IMM64(R2, 0xfecdba9876543210ULL),
5846+
BPF_ALU64_REG(BPF_MOV, R0, R1),
5847+
BPF_STX_MEM(BPF_DW, R10, R1, -40),
5848+
BPF_ATOMIC_OP(BPF_DW, BPF_CMPXCHG, R10, R2, -40),
5849+
BPF_LD_IMM64(R0, 0xfecdba9876543210ULL),
5850+
BPF_JMP_REG(BPF_JNE, R0, R2, 1),
5851+
BPF_ALU64_REG(BPF_SUB, R0, R2),
5852+
BPF_EXIT_INSN(),
5853+
},
5854+
INTERNAL,
5855+
{ },
5856+
{ { 0, 0 } },
5857+
.stack_depth = 40,
5858+
},
56935859
/* BPF_JMP32 | BPF_JEQ | BPF_K */
56945860
{
56955861
"JMP32_JEQ_K: Small immediate",

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