net: sched: introduce block mechanism to handle netif_keep_dst calls

Couple of classifiers call netif_keep_dst directly on q->dev. That is
not possible to do directly for shared blocke where multiple qdiscs are
owning the block. So introduce a infrastructure to keep track of the
block owners in list and use this list to implement block variant of
netif_keep_dst.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 8d78e7f..d79cc50 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -392,8 +392,8 @@ static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
 	prog->bpf_name = name;
 	prog->filter = fp;
 
-	if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS))
-		netif_keep_dst(qdisc_dev(tp->q));
+	if (fp->dst_needed)
+		tcf_block_netif_keep_dst(tp->chain->block);
 
 	return 0;
 }