sch_netem: support of 64bit rates

Add a new attribute to support 64bit rates so that
tc can use them to break the 32bit limit.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/pkt_sched.h b/include/uapi/linux/pkt_sched.h
index fe11920..77eb331 100644 (file)
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -525,6 +525,7 @@ enum {
        TCA_NETEM_LOSS,
        TCA_NETEM_RATE,
        TCA_NETEM_ECN,
+       TCA_NETEM_RATE64,
        __TCA_NETEM_MAX,
 };
 

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 9632a4e..090a4e3 100644 (file)
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -88,7 +88,7 @@ struct netem_sched_data {
        u32 duplicate;
        u32 reorder;
        u32 corrupt;
-       u32 rate;
+       u64 rate;
        s32 packet_overhead;
        u32 cell_size;
        u32 cell_size_reciprocal;
@@ -782,6 +782,7 @@ static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = {
        [TCA_NETEM_RATE]        = { .len = sizeof(struct tc_netem_rate) },
        [TCA_NETEM_LOSS]        = { .type = NLA_NESTED },
        [TCA_NETEM_ECN]         = { .type = NLA_U32 },
+       [TCA_NETEM_RATE64]      = { .type = NLA_U64 },
 };
 
 static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla,
@@ -852,6 +853,10 @@ static int netem_change(struct Qdisc *sch, struct nlattr *opt)
        if (tb[TCA_NETEM_RATE])
                get_rate(sch, tb[TCA_NETEM_RATE]);
 
+       if (tb[TCA_NETEM_RATE64])
+               q->rate = max_t(u64, q->rate,
+                               nla_get_u64(tb[TCA_NETEM_RATE64]));
+
        if (tb[TCA_NETEM_ECN])
                q->ecn = nla_get_u32(tb[TCA_NETEM_ECN]);
 
@@ -974,7 +979,13 @@ static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)
        if (nla_put(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt))
                goto nla_put_failure;
 
-       rate.rate = q->rate;
+       if (q->rate >= (1ULL << 32)) {
+               if (nla_put_u64(skb, TCA_NETEM_RATE64, q->rate))
+                       goto nla_put_failure;
+               rate.rate = ~0U;
+       } else {
+               rate.rate = q->rate;
+       }
        rate.packet_overhead = q->packet_overhead;
        rate.cell_size = q->cell_size;
        rate.cell_overhead = q->cell_overhead;