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Merge branch 'arm-bpf-next'

Browse source 
Nicolas Schichan says:

====================
ARM BPF JIT features

This series adds support for more instructions to the ARM BPF JIT
namely skb netdevice type retrieval, skb payload offset retrieval, and
skb packet type retrieval.

This allows 35 tests to use the JIT instead of 29 before.

This series depends on the "BPF JIT fixes for ARM" serie sent earlier.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-07-27 14:57:41 -07:00
commit 0b42c2863b
2 changed files with 42 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

41
arch/arm/net/bpf_jit_32.c
View file

@ -857,7 +857,9 @@ static int build_body(struct jit_ctx *ctx)
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 @@ static int build_body(struct jit_ctx *ctx)
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;
@ -895,6 +913,17 @@ static int build_body(struct jit_ctx *ctx)
OP_IMM3(ARM_AND, r_A, r_A, 0x1, ctx);
}
break;
case BPF_ANC | SKF_AD_PKTTYPE:
ctx->seen |= SEEN_SKB;
BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
__pkt_type_offset[0]) != 1);
off = PKT_TYPE_OFFSET();
emit(ARM_LDRB_I(r_A, r_skb, off), ctx);
emit(ARM_AND_I(r_A, r_A, PKT_TYPE_MAX), ctx);
#ifdef __BIG_ENDIAN_BITFIELD
emit(ARM_LSR_I(r_A, r_A, 5), ctx);
#endif
break;
case BPF_ANC | SKF_AD_QUEUE:
ctx->seen |= SEEN_SKB;
BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
@ -904,6 +933,14 @@ static int build_body(struct jit_ctx *ctx)
off = offsetof(struct sk_buff, queue_mapping);
emit(ARM_LDRH_I(r_A, r_skb, off), ctx);
break;
case BPF_ANC | SKF_AD_PAY_OFFSET:
ctx->seen |= SEEN_SKB | SEEN_CALL;
emit(ARM_MOV_R(ARM_R0, r_skb), ctx);
emit_mov_i(ARM_R3, (unsigned int)skb_get_poff, ctx);
emit_blx_r(ARM_R3, ctx);
emit(ARM_MOV_R(r_A, ARM_R0), ctx);
break;
case BPF_LDX | BPF_W | BPF_ABS:
/*
* load a 32bit word from struct seccomp_data.

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))