diff mbox series

[bpf-next,v3,10/13] bpf/tests: Add JMP tests with degenerate conditional

Message ID 20210909143303.811171-11-johan.almbladh@anyfinetworks.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf/tests: Extend JIT test suite coverage | expand

Checks

Context Check Description
bpf/vmtest-bpf-next-PR success PR summary
netdev/cover_letter success Link
netdev/fixes_present success Link
netdev/patch_count success Link
netdev/tree_selection success Clearly marked for bpf-next
netdev/subject_prefix success Link
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 100 this patch: 100
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/verify_fixes success Link
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 235 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 100 this patch: 100
netdev/header_inline success Link
bpf/vmtest-bpf-next success VM_Test

Commit Message

Johan Almbladh Sept. 9, 2021, 2:33 p.m. UTC 
This patch adds a set of tests for JMP and JMP32 operations where the
branch decision is know at JIT time. Mainly testing JIT behaviour.

Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
---
 lib/test_bpf.c | 229 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 229 insertions(+)
diff mbox series

Patch

diff --git a/lib/test_bpf.c b/lib/test_bpf.c
index 7286cf347b95..ae261667ca0a 100644
--- a/lib/test_bpf.c
+++ b/lib/test_bpf.c
@@ -10709,6 +10709,235 @@  static struct bpf_test tests[] = {
 		.fill_helper = bpf_fill_jmp32_jsle_reg,
 		.nr_testruns = NR_PATTERN_RUNS,
 	},
+	/* Conditional jumps with constant decision */
+	{
+		"JMP_JSET_K: imm = 0 -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_IMM(BPF_JSET, R1, 0, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JLT_K: imm = 0 -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_IMM(BPF_JLT, R1, 0, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JGE_K: imm = 0 -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_IMM(BPF_JGE, R1, 0, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JGT_K: imm = 0xffffffff -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_IMM(BPF_JGT, R1, U32_MAX, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JLE_K: imm = 0xffffffff -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_IMM(BPF_JLE, R1, U32_MAX, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP32_JSGT_K: imm = 0x7fffffff -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP32_IMM(BPF_JSGT, R1, S32_MAX, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP32_JSGE_K: imm = -0x80000000 -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP32_IMM(BPF_JSGE, R1, S32_MIN, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP32_JSLT_K: imm = -0x80000000 -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP32_IMM(BPF_JSLT, R1, S32_MIN, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP32_JSLE_K: imm = 0x7fffffff -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP32_IMM(BPF_JSLE, R1, S32_MAX, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JEQ_X: dst = src -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JEQ, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JGE_X: dst = src -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JGE, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JLE_X: dst = src -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JLE, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JSGE_X: dst = src -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JSGE, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JSLE_X: dst = src -> always taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JSLE, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 1 } },
+	},
+	{
+		"JMP_JNE_X: dst = src -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JNE, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JGT_X: dst = src -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JGT, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JLT_X: dst = src -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JLT, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JSGT_X: dst = src -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JSGT, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
+	{
+		"JMP_JSLT_X: dst = src -> never taken",
+		.u.insns_int = {
+			BPF_ALU64_IMM(BPF_MOV, R0, 1),
+			BPF_JMP_REG(BPF_JSLT, R1, R1, 1),
+			BPF_ALU64_IMM(BPF_MOV, R0, 0),
+			BPF_EXIT_INSN(),
+		},
+		INTERNAL | FLAG_NO_DATA,
+		{ },
+		{ { 0, 0 } },
+	},
 	/* Short relative jumps */
 	{
 		"Short relative jump: offset=0",