net_sched: add u64 rate to psched_ratecfg_precompute()

Add an extra u64 rate parameter to psched_ratecfg_precompute()
so that some qdisc can opt-in for 64bit rates in the future,
to overcome the ~34 Gbits limit.

psched_ratecfg_getrate() reports a legacy structure to
tc utility, so if actual rate is above the 32bit rate field,
cap it to the 34Gbit limit.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index f4eb365..d0a6321 100644 (file)
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -702,13 +702,20 @@ static inline u64 psched_l2t_ns(const struct psched_ratecfg *r,
 }
 
 void psched_ratecfg_precompute(struct psched_ratecfg *r,
-                              const struct tc_ratespec *conf);
+                              const struct tc_ratespec *conf,
+                              u64 rate64);
 
 static inline void psched_ratecfg_getrate(struct tc_ratespec *res,
                                          const struct psched_ratecfg *r)
 {
        memset(res, 0, sizeof(*res));
-       res->rate = r->rate_bytes_ps;
+
+       /* legacy struct tc_ratespec has a 32bit @rate field
+        * Qdisc using 64bit rate should add new attributes
+        * in order to maintain compatibility.
+        */
+       res->rate = min_t(u64, r->rate_bytes_ps, ~0U);
+
        res->overhead = r->overhead;
        res->linklayer = (r->linklayer & TC_LINKLAYER_MASK);
 }

diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 189e3c5..272d8e9 100644 (file)
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -231,14 +231,14 @@ override:
        }
        if (R_tab) {
                police->rate_present = true;
-               psched_ratecfg_precompute(&police->rate, &R_tab->rate);
+               psched_ratecfg_precompute(&police->rate, &R_tab->rate, 0);
                qdisc_put_rtab(R_tab);
        } else {
                police->rate_present = false;
        }
        if (P_tab) {
                police->peak_present = true;
-               psched_ratecfg_precompute(&police->peak, &P_tab->rate);
+               psched_ratecfg_precompute(&police->peak, &P_tab->rate, 0);
                qdisc_put_rtab(P_tab);
        } else {
                police->peak_present = false;

diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index a74e278..e7121d2 100644 (file)
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -910,11 +910,12 @@ void dev_shutdown(struct net_device *dev)
 }
 
 void psched_ratecfg_precompute(struct psched_ratecfg *r,
-                              const struct tc_ratespec *conf)
+                              const struct tc_ratespec *conf,
+                              u64 rate64)
 {
        memset(r, 0, sizeof(*r));
        r->overhead = conf->overhead;
-       r->rate_bytes_ps = conf->rate;
+       r->rate_bytes_ps = max_t(u64, conf->rate, rate64);
        r->linklayer = (conf->linklayer & TC_LINKLAYER_MASK);
        r->mult = 1;
        /*

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index 863846c..6b126f6 100644 (file)
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1491,8 +1491,8 @@ static int htb_change_class(struct Qdisc *sch, u32 classid,
                        cl->prio = TC_HTB_NUMPRIO - 1;
        }
 
-       psched_ratecfg_precompute(&cl->rate, &hopt->rate);
-       psched_ratecfg_precompute(&cl->ceil, &hopt->ceil);
+       psched_ratecfg_precompute(&cl->rate, &hopt->rate, 0);
+       psched_ratecfg_precompute(&cl->ceil, &hopt->ceil, 0);
 
        cl->buffer = PSCHED_TICKS2NS(hopt->buffer);
        cl->cbuffer = PSCHED_TICKS2NS(hopt->cbuffer);

diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 1aaf1b6..b057122 100644 (file)
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -341,9 +341,9 @@ 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);
+       psched_ratecfg_precompute(&q->rate, &rtab->rate, 0);
        if (ptab) {
-               psched_ratecfg_precompute(&q->peak, &ptab->rate);
+               psched_ratecfg_precompute(&q->peak, &ptab->rate, 0);
                q->peak_present = true;
        } else {
                q->peak_present = false;