net_sched: reduce fifo qdisc size

Because of various alignements [SLUB / qdisc], we use 512 bytes of
memory for one {p|b}fifo qdisc, instead of 256 bytes on 64bit arches and
192 bytes on 32bit ones.

Move the "u32 limit" inside "struct Qdisc" (no impact on other qdiscs)

Change qdisc_alloc(), first trying a regular allocation before an
oversized one.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 16626a04cb03..1934634f8896 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -83,6 +83,7 @@ struct Qdisc {
         struct gnet_stats_queue qstats;
         struct rcu_head         rcu_head;
         spinlock_t              busylock;
+        u32                     limit;
 };
 
 static inline bool qdisc_is_running(const struct Qdisc *qdisc)