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ARM: net: add support for BPF_ANC | SKF_AD_HATYPE in ARM JIT.

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Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Schichan 2015-07-27 15:06:51 +02:00 committed by David S. Miller
parent 303249ab16
commit 5bf705b43b
2 changed files with 23 additions and 2 deletions
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22
arch/arm/net/bpf_jit_32.c
View file

@ -857,7 +857,9 @@ b_epilogue:
emit(ARM_LDR_I(r_A, r_scratch, off), ctx);
break;
case BPF_ANC | SKF_AD_IFINDEX:
case BPF_ANC | SKF_AD_HATYPE:
/* A = skb->dev->ifindex */
/* A = skb->dev->type */
ctx->seen |= SEEN_SKB;
off = offsetof(struct sk_buff, dev);
emit(ARM_LDR_I(r_scratch, r_skb, off), ctx);
@ -867,8 +869,24 @@ b_epilogue:
BUILD_BUG_ON(FIELD_SIZEOF(struct net_device,
ifindex) != 4);
off = offsetof(struct net_device, ifindex);
emit(ARM_LDR_I(r_A, r_scratch, off), ctx);
BUILD_BUG_ON(FIELD_SIZEOF(struct net_device,
type) != 2);
if (code == (BPF_ANC | SKF_AD_IFINDEX)) {
off = offsetof(struct net_device, ifindex);
emit(ARM_LDR_I(r_A, r_scratch, off), ctx);
} else {
/*
* offset of field "type" in "struct
* net_device" is above what can be
* used in the ldrh rd, [rn, #imm]
* instruction, so load the offset in
* a register and use ldrh rd, [rn, rm]
*/
off = offsetof(struct net_device, type);
emit_mov_i(ARM_R3, off, ctx);
emit(ARM_LDRH_R(r_A, r_scratch, ARM_R3), ctx);
}
break;
case BPF_ANC | SKF_AD_MARK:
ctx->seen |= SEEN_SKB;

3
arch/arm/net/bpf_jit_32.h
View file

@ -74,6 +74,7 @@
#define ARM_INST_LDRB_I 0x05d00000
#define ARM_INST_LDRB_R 0x07d00000
#define ARM_INST_LDRH_I 0x01d000b0
#define ARM_INST_LDRH_R 0x019000b0
#define ARM_INST_LDR_I 0x05900000
#define ARM_INST_LDM 0x08900000
@ -160,6 +161,8 @@
| (rm))
#define ARM_LDRH_I(rt, rn, off) (ARM_INST_LDRH_I | (rt) << 12 | (rn) << 16 \
| (((off) & 0xf0) << 4) | ((off) & 0xf))
#define ARM_LDRH_R(rt, rn, rm) (ARM_INST_LDRH_R | (rt) << 12 | (rn) << 16 \
| (rm))
#define ARM_LDM(rn, regs) (ARM_INST_LDM | (rn) << 16 | (regs))