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MIPS: bpf: Use 'andi' instead of 'and' for the VLAN cases 

The VLAN_VID_MASK and VLAN_TAG_PRESENT are immediates, so using
'and' which expects 3 registers will produce wrong results. Fix
this by using the 'andi' instruction.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Daniel Borkmann <dborkman@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: netdev@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/7124/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Markos Chandras 2014-06-23 10:38:49 +01:00 committed by Ralf Baechle
parent 55393ee535
commit 9ee1606e8a
1 changed files with 2 additions and 2 deletions
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4
arch/mips/net/bpf_jit.c
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@ -1317,9 +1317,9 @@ jmp_cmp:
off = offsetof(struct sk_buff, vlan_tci);
emit_half_load(r_s0, r_skb, off, ctx);
if (code == (BPF_ANC | SKF_AD_VLAN_TAG))
emit_and(r_A, r_s0, VLAN_VID_MASK, ctx);
emit_andi(r_A, r_s0, VLAN_VID_MASK, ctx);
else
emit_and(r_A, r_s0, VLAN_TAG_PRESENT, ctx);
emit_andi(r_A, r_s0, VLAN_TAG_PRESENT, ctx);
break;
case BPF_ANC | SKF_AD_PKTTYPE:
off = pkt_type_offset();