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s390/bpf,jit: add vlan tag support 

s390 version of 855ddb56 "x86: bpf_jit_comp: add vlan tag support".

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-02-09 14:07:50 +01:00 committed by Martin Schwidefsky
parent a1dd7e4ef7
commit 5303a0fe8c
1 changed files with 21 additions and 0 deletions
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21
arch/s390/net/bpf_jit_comp.c
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@ -7,6 +7,7 @@
*/
#include <linux/moduleloader.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/filter.h>
#include <asm/cacheflush.h>
#include <asm/processor.h>
@ -254,6 +255,8 @@ static void bpf_jit_noleaks(struct bpf_jit *jit, struct sock_filter *filter)
case BPF_S_ANC_HATYPE:
case BPF_S_ANC_RXHASH:
case BPF_S_ANC_CPU:
case BPF_S_ANC_VLAN_TAG:
case BPF_S_ANC_VLAN_TAG_PRESENT:
case BPF_S_RET_K:
/* first instruction sets A register */
break;
@ -699,6 +702,24 @@ load_abs: if ((int) K < 0)
/* l %r5,<d(rxhash)>(%r2) */
EMIT4_DISP(0x58502000, offsetof(struct sk_buff, rxhash));
break;
case BPF_S_ANC_VLAN_TAG:
case BPF_S_ANC_VLAN_TAG_PRESENT:
BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2);
BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
/* lhi %r5,0 */
EMIT4(0xa7580000);
/* icm %r5,3,<d(vlan_tci)>(%r2) */
EMIT4_DISP(0xbf532000, offsetof(struct sk_buff, vlan_tci));
if (filter->code == BPF_S_ANC_VLAN_TAG) {
/* nill %r5,0xefff */
EMIT4_IMM(0xa5570000, ~VLAN_TAG_PRESENT);
} else {
/* nill %r5,0x1000 */
EMIT4_IMM(0xa5570000, VLAN_TAG_PRESENT);
/* srl %r5,12 */
EMIT4_DISP(0x88500000, 12);
}
break;
case BPF_S_ANC_CPU: /* A = smp_processor_id() */
#ifdef CONFIG_SMP
/* l %r5,<d(cpu_nr)> */