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net-tc: convert tc_verd to integer bitfields

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Extract the remaining two fields from tc_verd and remove the __u16
completely. TC_AT and TC_FROM are converted to equivalent two-bit
integer fields tc_at and tc_from. Where possible, use existing
helper skb_at_tc_ingress when reading tc_at. Introduce helper
skb_reset_tc to clear fields.

Not documenting tc_from and tc_at, because they will be replaced
with single bit fields in follow-on patches.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2017-01-07 17:06:36 -05:00 • committed by David S. Miller
parent e7246e122a
commit a5135bcfba
11 changed files with 29 additions and 65 deletions
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31
include/uapi/linux/pkt_cls.h
View file

@ -5,40 +5,9 @@
#include <linux/pkt_sched.h>
#ifdef __KERNEL__
/* I think i could have done better macros ; for now this is stolen from
* some arch/mips code - jhs
*/
#define _TC_MAKE32(x) ((x))
#define _TC_MAKEMASK1(n) (_TC_MAKE32(1) << _TC_MAKE32(n))
#define _TC_MAKEMASK(v,n) (_TC_MAKE32((_TC_MAKE32(1)<<(v))-1) << _TC_MAKE32(n))
#define _TC_MAKEVALUE(v,n) (_TC_MAKE32(v) << _TC_MAKE32(n))
#define _TC_GETVALUE(v,n,m) ((_TC_MAKE32(v) & _TC_MAKE32(m)) >> _TC_MAKE32(n))
/* verdict bit breakdown
*
bit 6,7: Where this packet was last seen
0: Above the transmit example at the socket level
1: on the Ingress
2: on the Egress
*
* */
#define S_TC_FROM _TC_MAKE32(6)
#define M_TC_FROM _TC_MAKEMASK(2,S_TC_FROM)
#define G_TC_FROM(x) _TC_GETVALUE(x,S_TC_FROM,M_TC_FROM)
#define V_TC_FROM(x) _TC_MAKEVALUE(x,S_TC_FROM)
#define SET_TC_FROM(v,n) ((V_TC_FROM(n)) | (v & ~M_TC_FROM))
#define AT_STACK 0x0
#define AT_INGRESS 0x1
#define AT_EGRESS 0x2
#define S_TC_AT _TC_MAKE32(12)
#define M_TC_AT _TC_MAKEMASK(2,S_TC_AT)
#define G_TC_AT(x) _TC_GETVALUE(x,S_TC_AT,M_TC_AT)
#define V_TC_AT(x) _TC_MAKEVALUE(x,S_TC_AT)
#define SET_TC_AT(v,n) ((V_TC_AT(n)) | (v & ~M_TC_AT))
#endif
/* Action attributes */