net/bpf_jit: MIPS: split VLAN_PRESENT bit handling from VLAN_TCI

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c
index 4d8cb9bb8365d07660d33c8049c045502fd4e1c6..de4c6372ad9a2f0d01e0453c3b608e8db7170bac 100644 (file)
--- a/arch/mips/net/bpf_jit.c
+++ b/arch/mips/net/bpf_jit.c
@@ -1159,19 +1159,22 @@ jmp_cmp:
                        emit_load(r_A, r_skb, off, ctx);
                        break;
                case BPF_ANC | SKF_AD_VLAN_TAG:
-               case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
                        ctx->flags |= SEEN_SKB | SEEN_A;
                        BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
                                                  vlan_tci) != 2);
                        off = offsetof(struct sk_buff, vlan_tci);
-                       emit_half_load_unsigned(r_s0, r_skb, off, ctx);
-                       if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) {
-                               emit_andi(r_A, r_s0, (u16)~VLAN_TAG_PRESENT, ctx);
-                       } else {
-                               emit_andi(r_A, r_s0, VLAN_TAG_PRESENT, ctx);
-                               /* return 1 if present */
-                               emit_sltu(r_A, r_zero, r_A, ctx);
-                       }
+                       emit_half_load_unsigned(r_A, r_skb, off, ctx);
+#ifdef VLAN_TAG_PRESENT
+                       emit_andi(r_A, r_A, (u16)~VLAN_TAG_PRESENT, ctx);
+#endif
+                       break;
+               case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
+                       ctx->flags |= SEEN_SKB | SEEN_A;
+                       emit_load_byte(r_A, r_skb, PKT_VLAN_PRESENT_OFFSET(), ctx);
+                       if (PKT_VLAN_PRESENT_BIT)
+                               emit_srl(r_A, r_A, PKT_VLAN_PRESENT_BIT, ctx);
+                       if (PKT_VLAN_PRESENT_BIT < 7)
+                               emit_andi(r_A, r_A, 1, ctx);
                        break;
                case BPF_ANC | SKF_AD_PKTTYPE:
                        ctx->flags |= SEEN_SKB;