net:qos: police action offloading parameter 'burst' change to the original value

Since 'tcfp_burst' with TICK factor, driver side always need to recover
it to the original value, this patch moves the generic calculation and
recover to the 'burst' original value before offloading to device driver.
Signed-off-by: Po Liu <po.liu@nxp.com>
Acked-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/ocelot/felix.c

@@ -746,9 +746,7 @@ static int felix_port_policer_add(struct dsa_switch *ds, int port,
 	struct ocelot *ocelot = ds->priv;
 	struct ocelot_policer pol = {
 		.rate = div_u64(policer->rate_bytes_per_sec, 1000) * 8,
-		.burst = div_u64(policer->rate_bytes_per_sec *
-				 PSCHED_NS2TICKS(policer->burst),
-				 PSCHED_TICKS_PER_SEC),
+		.burst = policer->burst,
 	};
 
 	return ocelot_port_policer_add(ocelot, port, &pol);

drivers/net/dsa/sja1105/sja1105_flower.c

@@ -31,7 +31,7 @@ static int sja1105_setup_bcast_policer(struct sja1105_private *priv,
 				       struct netlink_ext_ack *extack,
 				       unsigned long cookie, int port,
 				       u64 rate_bytes_per_sec,
-				       s64 burst)
+				       u32 burst)
 {
 	struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
 	struct sja1105_l2_policing_entry *policing;
@@ -79,9 +79,8 @@ static int sja1105_setup_bcast_policer(struct sja1105_private *priv,
 
 	policing[rule->bcast_pol.sharindx].rate = div_u64(rate_bytes_per_sec *
 							  512, 1000000);
-	policing[rule->bcast_pol.sharindx].smax = div_u64(rate_bytes_per_sec *
-							  PSCHED_NS2TICKS(burst),
-							  PSCHED_TICKS_PER_SEC);
+	policing[rule->bcast_pol.sharindx].smax = burst;
+
 	/* TODO: support per-flow MTU */
 	policing[rule->bcast_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
 						    ETH_FCS_LEN;
@@ -103,7 +102,7 @@ static int sja1105_setup_tc_policer(struct sja1105_private *priv,
 				    struct netlink_ext_ack *extack,
 				    unsigned long cookie, int port, int tc,
 				    u64 rate_bytes_per_sec,
-				    s64 burst)
+				    u32 burst)
 {
 	struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
 	struct sja1105_l2_policing_entry *policing;
@@ -152,9 +151,8 @@ static int sja1105_setup_tc_policer(struct sja1105_private *priv,
 
 	policing[rule->tc_pol.sharindx].rate = div_u64(rate_bytes_per_sec *
 						       512, 1000000);
-	policing[rule->tc_pol.sharindx].smax = div_u64(rate_bytes_per_sec *
-						       PSCHED_NS2TICKS(burst),
-						       PSCHED_TICKS_PER_SEC);
+	policing[rule->tc_pol.sharindx].smax = burst;
+
 	/* TODO: support per-flow MTU */
 	policing[rule->tc_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
 						 ETH_FCS_LEN;
@@ -177,7 +175,7 @@ static int sja1105_flower_policer(struct sja1105_private *priv, int port,
 				  unsigned long cookie,
 				  struct sja1105_key *key,
 				  u64 rate_bytes_per_sec,
-				  s64 burst)
+				  u32 burst)
 {
 	switch (key->type) {
 	case SJA1105_KEY_BCAST:

drivers/net/dsa/sja1105/sja1105_main.c

@@ -3324,9 +3324,7 @@ static int sja1105_port_policer_add(struct dsa_switch *ds, int port,
 	 */
 	policing[port].rate = div_u64(512 * policer->rate_bytes_per_sec,
 				      1000000);
-	policing[port].smax = div_u64(policer->rate_bytes_per_sec *
-				      PSCHED_NS2TICKS(policer->burst),
-				      PSCHED_TICKS_PER_SEC);
+	policing[port].smax = policer->burst;
 
 	return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
 }

drivers/net/ethernet/freescale/enetc/enetc_qos.c

@@ -1241,8 +1241,6 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 	/* Flow meter and max frame size */
 	if (entryp) {
 		if (entryp->police.burst) {
-			u64 temp;
-
 			fmi = kzalloc(sizeof(*fmi), GFP_KERNEL);
 			if (!fmi) {
 				err = -ENOMEM;
@@ -1250,11 +1248,7 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 			}
 			refcount_set(&fmi->refcount, 1);
 			fmi->cir = entryp->police.rate_bytes_ps;
-			/* Convert to original burst value */
-			temp = entryp->police.burst * fmi->cir;
-			temp = div_u64(temp, 1000000000ULL);
-
-			fmi->cbs = temp;
+			fmi->cbs = entryp->police.burst;
 			fmi->index = entryp->police.index;
 			filter->flags |= ENETC_PSFP_FLAGS_FMI;
 			filter->fmi_index = fmi->index;

drivers/net/ethernet/mscc/ocelot_flower.c

@@ -12,7 +12,6 @@ static int ocelot_flower_parse_action(struct flow_cls_offload *f,
 				      struct ocelot_vcap_filter *filter)
 {
 	const struct flow_action_entry *a;
-	s64 burst;
 	u64 rate;
 	int i;
 
@@ -35,8 +34,7 @@ static int ocelot_flower_parse_action(struct flow_cls_offload *f,
 			filter->action = OCELOT_VCAP_ACTION_POLICE;
 			rate = a->police.rate_bytes_ps;
 			filter->pol.rate = div_u64(rate, 1000) * 8;
-			burst = rate * PSCHED_NS2TICKS(a->police.burst);
-			filter->pol.burst = div_u64(burst, PSCHED_TICKS_PER_SEC);
+			filter->pol.burst = a->police.burst;
 			break;
 		default:
 			return -EOPNOTSUPP;

drivers/net/ethernet/mscc/ocelot_net.c

@@ -74,9 +74,7 @@ static int ocelot_setup_tc_cls_matchall(struct ocelot_port_private *priv,
 		}
 
 		pol.rate = (u32)div_u64(action->police.rate_bytes_ps, 1000) * 8;
-		pol.burst = (u32)div_u64(action->police.rate_bytes_ps *
-					 PSCHED_NS2TICKS(action->police.burst),
-					 PSCHED_TICKS_PER_SEC);
+		pol.burst = action->police.burst;
 
 		err = ocelot_port_policer_add(ocelot, port, &pol);
 		if (err) {

drivers/net/ethernet/netronome/nfp/flower/qos_conf.c

@@ -69,7 +69,8 @@ nfp_flower_install_rate_limiter(struct nfp_app *app, struct net_device *netdev,
 	struct nfp_repr *repr;
 	struct sk_buff *skb;
 	u32 netdev_port_id;
-	u64 burst, rate;
+	u32 burst;
+	u64 rate;
 
 	if (!nfp_netdev_is_nfp_repr(netdev)) {
 		NL_SET_ERR_MSG_MOD(extack, "unsupported offload: qos rate limit offload not supported on higher level port");
@@ -104,8 +105,7 @@ nfp_flower_install_rate_limiter(struct nfp_app *app, struct net_device *netdev,
 	}
 
 	rate = action->police.rate_bytes_ps;
-	burst = div_u64(rate * PSCHED_NS2TICKS(action->police.burst),
-			PSCHED_TICKS_PER_SEC);
+	burst = action->police.burst;
 	netdev_port_id = nfp_repr_get_port_id(netdev);
 
 	skb = nfp_flower_cmsg_alloc(repr->app, sizeof(struct nfp_police_config),

include/net/dsa.h

@@ -144,7 +144,7 @@ struct dsa_mall_mirror_tc_entry {
 
 /* TC port policer entry */
 struct dsa_mall_policer_tc_entry {
-	s64 burst;
+	u32 burst;
 	u64 rate_bytes_per_sec;
 };
 

include/net/flow_offload.h

@@ -233,7 +233,7 @@ struct flow_action_entry {
 		} sample;
 		struct {				/* FLOW_ACTION_POLICE */
 			u32			index;
-			s64			burst;
+			u32			burst;
 			u64			rate_bytes_ps;
 			u32			mtu;
 		} police;

include/net/tc_act/tc_police.h

@@ -59,14 +59,42 @@ static inline u64 tcf_police_rate_bytes_ps(const struct tc_action *act)
 	return params->rate.rate_bytes_ps;
 }
 
-static inline s64 tcf_police_tcfp_burst(const struct tc_action *act)
+static inline u32 tcf_police_burst(const struct tc_action *act)
 {
 	struct tcf_police *police = to_police(act);
 	struct tcf_police_params *params;
+	u32 burst;
 
 	params = rcu_dereference_protected(police->params,
 					   lockdep_is_held(&police->tcf_lock));
-	return params->tcfp_burst;
+
+	/*
+	 *  "rate" bytes   "burst" nanoseconds
+	 *  ------------ * -------------------
+	 *    1 second          2^6 ticks
+	 *
+	 * ------------------------------------
+	 *        NSEC_PER_SEC nanoseconds
+	 *        ------------------------
+	 *              2^6 ticks
+	 *
+	 *    "rate" bytes   "burst" nanoseconds            2^6 ticks
+	 *  = ------------ * ------------------- * ------------------------
+	 *      1 second          2^6 ticks        NSEC_PER_SEC nanoseconds
+	 *
+	 *   "rate" * "burst"
+	 * = ---------------- bytes/nanosecond
+	 *    NSEC_PER_SEC^2
+	 *
+	 *
+	 *   "rate" * "burst"
+	 * = ---------------- bytes/second
+	 *     NSEC_PER_SEC
+	 */
+	burst = div_u64(params->tcfp_burst * params->rate.rate_bytes_ps,
+			NSEC_PER_SEC);
+
+	return burst;
 }
 
 static inline u32 tcf_police_tcfp_mtu(const struct tc_action *act)

net/sched/cls_api.c

@@ -3660,7 +3660,7 @@ int tc_setup_flow_action(struct flow_action *flow_action,
 			tcf_sample_get_group(entry, act);
 		} else if (is_tcf_police(act)) {
 			entry->id = FLOW_ACTION_POLICE;
-			entry->police.burst = tcf_police_tcfp_burst(act);
+			entry->police.burst = tcf_police_burst(act);
 			entry->police.rate_bytes_ps =
 				tcf_police_rate_bytes_ps(act);
 			entry->police.mtu = tcf_police_tcfp_mtu(act);