net: enetc: add support max frame size for tc flower offload

Base on the tc flower offload police action add max frame size by the
parameter 'mtu'. Tc flower device driver working by the IEEE 802.1Qci
stream filter can implement the max frame size filtering. Add it to the
current hardware tc flower stearm filter driver.
Signed-off-by: Po Liu <Po.Liu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -389,6 +389,7 @@ struct enetc_psfp_filter {
 	u32 index;
 	s32 handle;
 	s8 prio;
+	u32 maxsdu;
 	u32 gate_id;
 	s32 meter_id;
 	refcount_t refcount;
@@ -430,6 +431,12 @@ static struct actions_fwd enetc_act_fwd[] = {
 		BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS),
 		FILTER_ACTION_TYPE_PSFP
 	},
+	{
+		BIT(FLOW_ACTION_POLICE) |
+		BIT(FLOW_ACTION_GATE),
+		BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS),
+		FILTER_ACTION_TYPE_PSFP
+	},
 	/* example for ACL actions */
 	{
 		BIT(FLOW_ACTION_DROP),
@@ -594,8 +601,12 @@ static int enetc_streamfilter_hw_set(struct enetc_ndev_priv *priv,
 	/* Filter Type. Identifies the contents of the MSDU/FM_INST_INDEX
 	 * field as being either an MSDU value or an index into the Flow
 	 * Meter Instance table.
-	 * TODO: no limit max sdu
 	 */
+	if (sfi->maxsdu) {
+		sfi_config->msdu =
+		cpu_to_le16(sfi->maxsdu);
+		sfi_config->multi |= 0x40;
+	}
 
 	if (sfi->meter_id >= 0) {
 		sfi_config->fm_inst_table_index = cpu_to_le16(sfi->meter_id);
@@ -872,6 +883,7 @@ static struct enetc_psfp_filter
 	hlist_for_each_entry(s, &epsfp.psfp_filter_list, node)
 		if (s->gate_id == sfi->gate_id &&
 		    s->prio == sfi->prio &&
+		    s->maxsdu == sfi->maxsdu &&
 		    s->meter_id == sfi->meter_id)
 			return s;
 
@@ -979,6 +991,7 @@ static struct actions_fwd *enetc_check_flow_actions(u64 acts,
 static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 				      struct flow_cls_offload *f)
 {
+	struct flow_action_entry *entryg = NULL, *entryp = NULL;
 	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
 	struct netlink_ext_ack *extack = f->common.extack;
 	struct enetc_stream_filter *filter, *old_filter;
@@ -997,9 +1010,12 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 
 	flow_action_for_each(i, entry, &rule->action)
 		if (entry->id == FLOW_ACTION_GATE)
-			break;
+			entryg = entry;
+		else if (entry->id == FLOW_ACTION_POLICE)
+			entryp = entry;
 
-	if (entry->id != FLOW_ACTION_GATE)
+	/* Not support without gate action */
+	if (!entryg)
 		return -EINVAL;
 
 	filter = kzalloc(sizeof(*filter), GFP_KERNEL);
@@ -1079,19 +1095,19 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 	}
 
 	/* parsing gate action */
-	if (entry->gate.index >= priv->psfp_cap.max_psfp_gate) {
+	if (entryg->gate.index >= priv->psfp_cap.max_psfp_gate) {
 		NL_SET_ERR_MSG_MOD(extack, "No Stream Gate resource!");
 		err = -ENOSPC;
 		goto free_filter;
 	}
 
-	if (entry->gate.num_entries >= priv->psfp_cap.max_psfp_gatelist) {
+	if (entryg->gate.num_entries >= priv->psfp_cap.max_psfp_gatelist) {
 		NL_SET_ERR_MSG_MOD(extack, "No Stream Gate resource!");
 		err = -ENOSPC;
 		goto free_filter;
 	}
 
-	entries_size = struct_size(sgi, entries, entry->gate.num_entries);
+	entries_size = struct_size(sgi, entries, entryg->gate.num_entries);
 	sgi = kzalloc(entries_size, GFP_KERNEL);
 	if (!sgi) {
 		err = -ENOMEM;
@@ -1099,18 +1115,18 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 	}
 
 	refcount_set(&sgi->refcount, 1);
-	sgi->index = entry->gate.index;
-	sgi->init_ipv = entry->gate.prio;
-	sgi->basetime = entry->gate.basetime;
-	sgi->cycletime = entry->gate.cycletime;
-	sgi->num_entries = entry->gate.num_entries;
+	sgi->index = entryg->gate.index;
+	sgi->init_ipv = entryg->gate.prio;
+	sgi->basetime = entryg->gate.basetime;
+	sgi->cycletime = entryg->gate.cycletime;
+	sgi->num_entries = entryg->gate.num_entries;
 
 	e = sgi->entries;
-	for (i = 0; i < entry->gate.num_entries; i++) {
-		e[i].gate_state = entry->gate.entries[i].gate_state;
-		e[i].interval = entry->gate.entries[i].interval;
-		e[i].ipv = entry->gate.entries[i].ipv;
-		e[i].maxoctets = entry->gate.entries[i].maxoctets;
+	for (i = 0; i < entryg->gate.num_entries; i++) {
+		e[i].gate_state = entryg->gate.entries[i].gate_state;
+		e[i].interval = entryg->gate.entries[i].interval;
+		e[i].ipv = entryg->gate.entries[i].ipv;
+		e[i].maxoctets = entryg->gate.entries[i].maxoctets;
 	}
 
 	filter->sgi_index = sgi->index;
@@ -1127,6 +1143,10 @@ static int enetc_psfp_parse_clsflower(struct enetc_ndev_priv *priv,
 	/* flow meter not support yet */
 	sfi->meter_id = ENETC_PSFP_WILDCARD;
 
+	/* Max frame size */
+	if (entryp)
+		sfi->maxsdu = entryp->police.mtu;
+
 	/* prio ref the filter prio */
 	if (f->common.prio && f->common.prio <= BIT(3))
 		sfi->prio = f->common.prio - 1;