net-tc: extract skip classify bit from tc_verd

Packets sent by the IFB device skip subsequent tc classification.
A single bit governs this state. Move it out of tc_verd in
anticipation of removing that __u16 completely.

The new bitfield tc_skip_classify temporarily uses one bit of a
hole, until tc_verd is removed completely in a follow-up patch.

Remove the bit hole comment. It could be 2, 3, 4 or 5 bits long.
With that many options, little value in documenting it.

Introduce a helper function to deduplicate the logic in the two
sites that check this bit.

The field tc_skip_classify is set only in IFB on skbs cloned in
act_mirred, so original packet sources do not have to clear the
bit when reusing packets (notably, pktgen and octeon).

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 6 deletions

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index bba23dbb3ab6..1eed5d7509bc 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -22,8 +22,6 @@ bit 6,7: Where this packet was last seen
 1: on the Ingress
 2: on the Egress
 
-bit 8: when set --> Request not to classify on ingress. 
-
  *
  * */
 
@@ -36,10 +34,6 @@ bit 8: when set --> Request not to classify on ingress.
 #define AT_INGRESS	0x1
 #define AT_EGRESS	0x2
 
-#define TC_NCLS          _TC_MAKEMASK1(8)
-#define SET_TC_NCLS(v)   ( TC_NCLS | (v & ~TC_NCLS))
-#define CLR_TC_NCLS(v)   ( v & ~TC_NCLS)
-
 #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)