diff options
| author | Nicolas Schichan <nschichan@freebox.fr> | 2015-07-27 13:06:51 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-27 21:57:41 (GMT) |
| commit | 5bf705b43b7243c68e831ed3072db2ed00edc7fa (patch) | |
| tree | 5abc52ad5c8911601ae06180ba123b9eeb997f66 /arch | |
| parent | 303249ab168f58ee52c502389b9a8046af78d142 (diff) | |
| download | linux-5bf705b43b7243c68e831ed3072db2ed00edc7fa.tar.xz | |
ARM: net: add support for BPF_ANC | SKF_AD_HATYPE in ARM JIT.
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 22 | ||||
| -rw-r--r-- | arch/arm/net/bpf_jit_32.h | 3 |
2 files changed, 23 insertions, 2 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index 3c73caf..876060b 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -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; diff --git a/arch/arm/net/bpf_jit_32.h b/arch/arm/net/bpf_jit_32.h index b2d7d92..4b17d5ab 100644 --- a/arch/arm/net/bpf_jit_32.h +++ b/arch/arm/net/bpf_jit_32.h @@ -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)) |