[PATCH 2.4 PKT_SCHED] Report qdisc parent to userspace

[Thomas Graf <tgraf@xxxxxxx>]

Report parent classid of a qdisc back to userspace. Without this there
is no way for userspace to see if the qdisc is attached to a class
other than parsing all class trees of the link and check all tcm_info
fields in the leaf classes.

Signed-off-by: Thomas Graf <tgraf@xxxxxxx>

--- linux-2.4.28-pre3-bk4.orig/include/net/pkt_sched.h  2004-09-29 
00:42:01.000000000 +0200
+++ linux-2.4.28-pre3-bk4/include/net/pkt_sched.h       2004-09-29 
00:54:46.000000000 +0200
@@ -81,6 +81,7 @@
 #define TCQ_F_INGRES   4
        struct Qdisc_ops        *ops;
        u32                     handle;
+       u32                     parent;
        atomic_t                refcnt;
        struct sk_buff_head     q;
        struct net_device       *dev;
--- linux-2.4.28-pre3-bk4.orig/net/sched/sch_api.c      2004-09-29 
00:42:03.000000000 +0200
+++ linux-2.4.28-pre3-bk4/net/sched/sch_api.c   2004-09-29 00:59:36.000000000 
+0200
@@ -371,6 +371,8 @@
                        unsigned long cl = cops->get(parent, classid);
                        if (cl) {
                                err = cops->graft(parent, cl, new, old);
+                               if (new)
+                                       new->parent = classid;
                                cops->put(parent, cl);
                        }
                }
@@ -812,7 +814,7 @@
                                q_idx++;
                                continue;
                        }
-                       if (tc_fill_qdisc(skb, q, 0, NETLINK_CB(cb->skb).pid,
+                       if (tc_fill_qdisc(skb, q, q->parent, 
NETLINK_CB(cb->skb).pid,
                                          cb->nlh->nlmsg_seq, NLM_F_MULTI, 
RTM_NEWQDISC) <= 0) {
                                read_unlock(&qdisc_tree_lock);
                                goto done;