change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/tools/testing/selftests/bpf/prog_tests/align.c
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@@ -2,7 +2,7 @@
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 #include <test_progs.h>
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 #define MAX_INSNS	512
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-#define MAX_MATCHES	16
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+#define MAX_MATCHES	24
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 struct bpf_reg_match {
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 	unsigned int line;
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@@ -267,6 +267,7 @@
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 			 */
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 			BPF_MOV64_REG(BPF_REG_5, BPF_REG_2),
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 			BPF_ALU64_REG(BPF_ADD, BPF_REG_5, BPF_REG_6),
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+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_5),
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 			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 14),
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 			BPF_MOV64_REG(BPF_REG_4, BPF_REG_5),
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 			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 4),
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@@ -280,6 +281,7 @@
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 			BPF_MOV64_REG(BPF_REG_5, BPF_REG_2),
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 			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 14),
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 			BPF_ALU64_REG(BPF_ADD, BPF_REG_5, BPF_REG_6),
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+			BPF_MOV64_REG(BPF_REG_4, BPF_REG_5),
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 			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 4),
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 			BPF_ALU64_REG(BPF_ADD, BPF_REG_5, BPF_REG_6),
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 			BPF_MOV64_REG(BPF_REG_4, BPF_REG_5),
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@@ -311,44 +313,52 @@
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 			{15, "R4=pkt(id=1,off=18,r=18,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			{15, "R5=pkt(id=1,off=14,r=18,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			/* Variable offset is added to R5 packet pointer,
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-			 * resulting in auxiliary alignment of 4.
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+			 * resulting in auxiliary alignment of 4. To avoid BPF
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+			 * verifier's precision backtracking logging
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+			 * interfering we also have a no-op R4 = R5
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+			 * instruction to validate R5 state. We also check
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+			 * that R4 is what it should be in such case.
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 			 */
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-			{18, "R5_w=pkt(id=2,off=0,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{19, "R4_w=pkt(id=2,off=0,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{19, "R5_w=pkt(id=2,off=0,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			/* Constant offset is added to R5, resulting in
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 			 * reg->off of 14.
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 			 */
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-			{19, "R5_w=pkt(id=2,off=14,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{20, "R5_w=pkt(id=2,off=14,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			/* At the time the word size load is performed from R5,
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 			 * its total fixed offset is NET_IP_ALIGN + reg->off
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 			 * (14) which is 16.  Then the variable offset is 4-byte
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 			 * aligned, so the total offset is 4-byte aligned and
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 			 * meets the load's requirements.
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 			 */
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-			{23, "R4=pkt(id=2,off=18,r=18,umax_value=1020,var_off=(0x0; 0x3fc))"},
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-			{23, "R5=pkt(id=2,off=14,r=18,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{24, "R4=pkt(id=2,off=18,r=18,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{24, "R5=pkt(id=2,off=14,r=18,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			/* Constant offset is added to R5 packet pointer,
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 			 * resulting in reg->off value of 14.
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 			 */
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-			{26, "R5_w=pkt(id=0,off=14,r=8"},
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+			{27, "R5_w=pkt(id=0,off=14,r=8"},
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 			/* Variable offset is added to R5, resulting in a
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-			 * variable offset of (4n).
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+			 * variable offset of (4n). See comment for insn #19
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+			 * for R4 = R5 trick.
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 			 */
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-			{27, "R5_w=pkt(id=3,off=14,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{29, "R4_w=pkt(id=3,off=14,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{29, "R5_w=pkt(id=3,off=14,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			/* Constant is added to R5 again, setting reg->off to 18. */
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-			{28, "R5_w=pkt(id=3,off=18,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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+			{30, "R5_w=pkt(id=3,off=18,r=0,umax_value=1020,var_off=(0x0; 0x3fc))"},
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 			/* And once more we add a variable; resulting var_off
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 			 * is still (4n), fixed offset is not changed.
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 			 * Also, we create a new reg->id.
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 			 */
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-			{29, "R5_w=pkt(id=4,off=18,r=0,umax_value=2040,var_off=(0x0; 0x7fc)"},
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+			{32, "R4_w=pkt(id=4,off=18,r=0,umax_value=2040,var_off=(0x0; 0x7fc)"},
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+			{32, "R5_w=pkt(id=4,off=18,r=0,umax_value=2040,var_off=(0x0; 0x7fc)"},
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 			/* At the time the word size load is performed from R5,
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 			 * its total fixed offset is NET_IP_ALIGN + reg->off (18)
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 			 * which is 20.  Then the variable offset is (4n), so
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 			 * the total offset is 4-byte aligned and meets the
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 			 * load's requirements.
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 			 */
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-			{33, "R4=pkt(id=4,off=22,r=22,umax_value=2040,var_off=(0x0; 0x7fc)"},
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-			{33, "R5=pkt(id=4,off=18,r=22,umax_value=2040,var_off=(0x0; 0x7fc)"},
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+			{35, "R4=pkt(id=4,off=22,r=22,umax_value=2040,var_off=(0x0; 0x7fc)"},
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+			{35, "R5=pkt(id=4,off=18,r=22,umax_value=2040,var_off=(0x0; 0x7fc)"},
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 		},
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 	},
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 	{