net_sched: tbf: support of 64bit rates

With psched_ratecfg_precompute(), tbf can deal with 64bit rates.
Add two new attributes so that tc can use them to break the 32bit
limit.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Suggested-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Eric Dumazet <edumazet@google.com>
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 f2624b5..307f293 100644 (file)
--- a/include/uapi/linux/pkt_sched.h
+++ b/include/uapi/linux/pkt_sched.h
@@ -171,6 +171,8 @@ enum {
        TCA_TBF_PARMS,
        TCA_TBF_RTAB,
        TCA_TBF_PTAB,
+       TCA_TBF_RATE64,
+       TCA_TBF_PRATE64,
        __TCA_TBF_MAX,
 };
 

diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index b057122..68f9859 100644 (file)
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -266,20 +266,23 @@ static const struct nla_policy tbf_policy[TCA_TBF_MAX + 1] = {
        [TCA_TBF_PARMS] = { .len = sizeof(struct tc_tbf_qopt) },
        [TCA_TBF_RTAB]  = { .type = NLA_BINARY, .len = TC_RTAB_SIZE },
        [TCA_TBF_PTAB]  = { .type = NLA_BINARY, .len = TC_RTAB_SIZE },
+       [TCA_TBF_RATE64]        = { .type = NLA_U64 },
+       [TCA_TBF_PRATE64]       = { .type = NLA_U64 },
 };
 
 static int tbf_change(struct Qdisc *sch, struct nlattr *opt)
 {
        int err;
        struct tbf_sched_data *q = qdisc_priv(sch);
-       struct nlattr *tb[TCA_TBF_PTAB + 1];
+       struct nlattr *tb[TCA_TBF_MAX + 1];
        struct tc_tbf_qopt *qopt;
        struct qdisc_rate_table *rtab = NULL;
        struct qdisc_rate_table *ptab = NULL;
        struct Qdisc *child = NULL;
        int max_size, n;
+       u64 rate64 = 0, prate64 = 0;
 
-       err = nla_parse_nested(tb, TCA_TBF_PTAB, opt, tbf_policy);
+       err = nla_parse_nested(tb, TCA_TBF_MAX, opt, tbf_policy);
        if (err < 0)
                return err;
 
@@ -341,9 +344,13 @@ static int tbf_change(struct Qdisc *sch, struct nlattr *opt)
        q->tokens = q->buffer;
        q->ptokens = q->mtu;
 
-       psched_ratecfg_precompute(&q->rate, &rtab->rate, 0);
+       if (tb[TCA_TBF_RATE64])
+               rate64 = nla_get_u64(tb[TCA_TBF_RATE64]);
+       psched_ratecfg_precompute(&q->rate, &rtab->rate, rate64);
        if (ptab) {
-               psched_ratecfg_precompute(&q->peak, &ptab->rate, 0);
+               if (tb[TCA_TBF_PRATE64])
+                       prate64 = nla_get_u64(tb[TCA_TBF_PRATE64]);
+               psched_ratecfg_precompute(&q->peak, &ptab->rate, prate64);
                q->peak_present = true;
        } else {
                q->peak_present = false;
@@ -402,6 +409,13 @@ static int tbf_dump(struct Qdisc *sch, struct sk_buff *skb)
        opt.buffer = PSCHED_NS2TICKS(q->buffer);
        if (nla_put(skb, TCA_TBF_PARMS, sizeof(opt), &opt))
                goto nla_put_failure;
+       if (q->rate.rate_bytes_ps >= (1ULL << 32) &&
+           nla_put_u64(skb, TCA_TBF_RATE64, q->rate.rate_bytes_ps))
+               goto nla_put_failure;
+       if (q->peak_present &&
+           q->peak.rate_bytes_ps >= (1ULL << 32) &&
+           nla_put_u64(skb, TCA_TBF_PRATE64, q->peak.rate_bytes_ps))
+               goto nla_put_failure;
 
        nla_nest_end(skb, nest);
        return skb->len;