net-tc: convert tc_at to tc_at_ingress

Field tc_at is used only within tc actions to distinguish ingress from
egress processing. A single bit is sufficient for this purpose.

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index 8b5d6d0..c143f13 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3153,9 +3153,7 @@
 	if (!cl)
 		return skb;
 
-	/* skb->tc_at and qdisc_skb_cb(skb)->pkt_len were already set
-	 * earlier by the caller.
-	 */
+	/* qdisc_skb_cb(skb)->pkt_len was already set by the caller. */
 	qdisc_bstats_cpu_update(cl->q, skb);
 
 	switch (tc_classify(skb, cl, &cl_res, false)) {
@@ -3320,7 +3318,7 @@
 
 	qdisc_pkt_len_init(skb);
 #ifdef CONFIG_NET_CLS_ACT
-	skb->tc_at = AT_EGRESS;
+	skb->tc_at_ingress = 0;
 # ifdef CONFIG_NET_EGRESS
 	if (static_key_false(&egress_needed)) {
 		skb = sch_handle_egress(skb, &rc, dev);
@@ -3920,7 +3918,7 @@
 	}
 
 	qdisc_skb_cb(skb)->pkt_len = skb->len;
-	skb->tc_at = AT_INGRESS;
+	skb->tc_at_ingress = 1;
 	qdisc_bstats_cpu_update(cl->q, skb);
 
 	switch (tc_classify(skb, cl, &cl_res, false)) {