PPC: bpf_jit_comp: add SKF_AD_PKTTYPE instruction

Add BPF extension SKF_AD_PKTTYPE to ppc JIT to load
skb->pkt_type field.

Before:
[   88.262622] test_bpf: #11 LD_IND_NET 86 97 99 PASS
[   88.265740] test_bpf: #12 LD_PKTTYPE 109 107 PASS

After:
[   80.605964] test_bpf: #11 LD_IND_NET 44 40 39 PASS
[   80.607370] test_bpf: #12 LD_PKTTYPE 9 9 PASS

CC: Alexei Starovoitov<alexei.starovoitov@gmail.com>
CC: Michael Ellerman<mpe@ellerman.id.au>
Cc: Matt Evans <matt@ozlabs.org>
Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>

v2: Added test rusults
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index cbae2dfd053c..d110e288d7ac 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -407,6 +407,11 @@ static int bpf_jit_build_body(struct bpf_prog *fp, u32 *image,
                         PPC_LHZ_OFFS(r_A, r_skb, offsetof(struct sk_buff,
                                                           queue_mapping));
                         break;
+                case BPF_ANC | SKF_AD_PKTTYPE:
+                        PPC_LBZ_OFFS(r_A, r_skb, PKT_TYPE_OFFSET());
+                        PPC_ANDI(r_A, r_A, PKT_TYPE_MAX);
+                        PPC_SRWI(r_A, r_A, 5);
+                        break;
                 case BPF_ANC | SKF_AD_CPU:
 #ifdef CONFIG_SMP
                         /*