netdev - [v2] net_sched: act_police: add 2 new attributes to support police 64bit rate and peakrate

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Date:   Fri, 30 Aug 2019 14:06:14 -0500
From:   David Dai <zdai@...ux.vnet.ibm.com>
To:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     zdai@...ibm.com, zdai@...ux.vnet.ibm.com
Subject: [v2] net_sched: act_police: add 2 new attributes to support police 64bit rate and peakrate

For high speed adapter like Mellanox CX-5 card, it can reach upto
100 Gbits per second bandwidth. Currently htb already supports 64bit rate
in tc utility. However police action rate and peakrate are still limited
to 32bit value (upto 32 Gbits per second). Add 2 new attributes
TCA_POLICE_RATE64 and TCA_POLICE_RATE64 in kernel for 64bit support
so that tc utility can use them for 64bit rate and peakrate value to
break the 32bit limit, and still keep the backward binary compatibility.

Tested-by: David Dai <zdai@...ux.vnet.ibm.com>
Signed-off-by: David Dai <zdai@...ux.vnet.ibm.com>
---
Changelog:
v1->v2:
 - Move 2 attributes TCA_POLICE_RATE64 TCA_POLICE_PEAKRATE64 after
   TCA_POLICE_PAD in pkt_cls.h header.
---
 include/uapi/linux/pkt_cls.h |    2 ++
 net/sched/act_police.c       |   27 +++++++++++++++++++++++----
 2 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index b057aee..a6aa466 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -160,6 +160,8 @@ enum {
 	TCA_POLICE_RESULT,
 	TCA_POLICE_TM,
 	TCA_POLICE_PAD,
+	TCA_POLICE_RATE64,
+	TCA_POLICE_PEAKRATE64,
 	__TCA_POLICE_MAX
 #define TCA_POLICE_RESULT TCA_POLICE_RESULT
 };
diff --git a/net/sched/act_police.c b/net/sched/act_police.c
index 49cec3e..425f2a3 100644
--- a/net/sched/act_police.c
+++ b/net/sched/act_police.c
@@ -40,6 +40,8 @@ static int tcf_police_walker(struct net *net, struct sk_buff *skb,
 	[TCA_POLICE_PEAKRATE]	= { .len = TC_RTAB_SIZE },
 	[TCA_POLICE_AVRATE]	= { .type = NLA_U32 },
 	[TCA_POLICE_RESULT]	= { .type = NLA_U32 },
+	[TCA_POLICE_RATE64]     = { .type = NLA_U64 },
+	[TCA_POLICE_PEAKRATE64] = { .type = NLA_U64 },
 };
 
 static int tcf_police_init(struct net *net, struct nlattr *nla,
@@ -58,6 +60,7 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
 	struct tcf_police_params *new;
 	bool exists = false;
 	u32 index;
+	u64 rate64, prate64;
 
 	if (nla == NULL)
 		return -EINVAL;
@@ -155,14 +158,18 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
 	}
 	if (R_tab) {
 		new->rate_present = true;
-		psched_ratecfg_precompute(&new->rate, &R_tab->rate, 0);
+		rate64 = tb[TCA_POLICE_RATE64] ?
+			 nla_get_u64(tb[TCA_POLICE_RATE64]) : 0;
+		psched_ratecfg_precompute(&new->rate, &R_tab->rate, rate64);
 		qdisc_put_rtab(R_tab);
 	} else {
 		new->rate_present = false;
 	}
 	if (P_tab) {
 		new->peak_present = true;
-		psched_ratecfg_precompute(&new->peak, &P_tab->rate, 0);
+		prate64 = tb[TCA_POLICE_PEAKRATE64] ?
+			  nla_get_u64(tb[TCA_POLICE_PEAKRATE64]) : 0;
+		psched_ratecfg_precompute(&new->peak, &P_tab->rate, prate64);
 		qdisc_put_rtab(P_tab);
 	} else {
 		new->peak_present = false;
@@ -313,10 +320,22 @@ static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,
 				      lockdep_is_held(&police->tcf_lock));
 	opt.mtu = p->tcfp_mtu;
 	opt.burst = PSCHED_NS2TICKS(p->tcfp_burst);
-	if (p->rate_present)
+	if (p->rate_present) {
 		psched_ratecfg_getrate(&opt.rate, &p->rate);
-	if (p->peak_present)
+		if ((police->params->rate.rate_bytes_ps >= (1ULL << 32)) &&
+		    nla_put_u64_64bit(skb, TCA_POLICE_RATE64,
+				      police->params->rate.rate_bytes_ps,
+				      __TCA_POLICE_MAX))
+			goto nla_put_failure;
+	}
+	if (p->peak_present) {
 		psched_ratecfg_getrate(&opt.peakrate, &p->peak);
+		if ((police->params->peak.rate_bytes_ps >= (1ULL << 32)) &&
+		    nla_put_u64_64bit(skb, TCA_POLICE_PEAKRATE64,
+				      police->params->peak.rate_bytes_ps,
+				      __TCA_POLICE_MAX))
+			goto nla_put_failure;
+	}
 	if (nla_put(skb, TCA_POLICE_TBF, sizeof(opt), &opt))
 		goto nla_put_failure;
 	if (p->tcfp_result &&
-- 
1.7.1