net/sched: flower: Support hardware miss to tc action

To support hardware miss to tc action in actions on the flower
classifier, implement the required getting of filter actions,
and setup filter exts (actions) miss by giving it the filter's
handle and actions.
Signed-off-by: Paul Blakey <paulb@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Reviewed-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/sched/cls_flower.c

@@ -529,6 +529,15 @@ static struct cls_fl_filter *__fl_get(struct cls_fl_head *head, u32 handle)
 	return f;
 }
 
+static struct tcf_exts *fl_get_exts(const struct tcf_proto *tp, u32 handle)
+{
+	struct cls_fl_head *head = rcu_dereference_bh(tp->root);
+	struct cls_fl_filter *f;
+
+	f = idr_find(&head->handle_idr, handle);
+	return f ? &f->exts : NULL;
+}
+
 static int __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f,
 		       bool *last, bool rtnl_held,
 		       struct netlink_ext_ack *extack)
@@ -2222,7 +2231,8 @@ static int fl_change(struct net *net, struct sk_buff *in_skb,
 	}
 	fnew->handle = handle;
 
-	err = tcf_exts_init(&fnew->exts, net, TCA_FLOWER_ACT, 0);
+	err = tcf_exts_init_ex(&fnew->exts, net, TCA_FLOWER_ACT, 0, tp, handle,
+			       !tc_skip_hw(fnew->flags));
 	if (err < 0)
 		goto errout_idr;
 
@@ -3444,6 +3454,7 @@ static struct tcf_proto_ops cls_fl_ops __read_mostly = {
 	.tmplt_create	= fl_tmplt_create,
 	.tmplt_destroy	= fl_tmplt_destroy,
 	.tmplt_dump	= fl_tmplt_dump,
+	.get_exts	= fl_get_exts,
 	.owner		= THIS_MODULE,
 	.flags		= TCF_PROTO_OPS_DOIT_UNLOCKED,
 };