riscv, bpf: Support 32-bit offset jmp insn

Add support 32-bit offset jmp instruction for RV64.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/r/20230824095001.3408573-5-pulehui@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Author: Pu Lehui

arch/riscv/net/bpf_jit_comp64.c

@@ -1327,7 +1327,11 @@ int bpf_jit_emit_insn(const struct bpf_insn *insn, struct rv_jit_context *ctx,
 
 	/* JUMP off */
 	case BPF_JMP | BPF_JA:
-		rvoff = rv_offset(i, off, ctx);
+	case BPF_JMP32 | BPF_JA:
+		if (BPF_CLASS(code) == BPF_JMP)
+			rvoff = rv_offset(i, off, ctx);
+		else
+			rvoff = rv_offset(i, imm, ctx);
 		ret = emit_jump_and_link(RV_REG_ZERO, rvoff, true, ctx);
 		if (ret)
 			return ret;