--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright 2020, NXP Semiconductors
+ */
+#include "sja1105.h"
+
+static struct sja1105_rule *sja1105_rule_find(struct sja1105_private *priv,
+ unsigned long cookie)
+{
+ struct sja1105_rule *rule;
+
+ list_for_each_entry(rule, &priv->flow_block.rules, list)
+ if (rule->cookie == cookie)
+ return rule;
+
+ return NULL;
+}
+
+static int sja1105_find_free_l2_policer(struct sja1105_private *priv)
+{
+ int i;
+
+ for (i = 0; i < SJA1105_NUM_L2_POLICERS; i++)
+ if (!priv->flow_block.l2_policer_used[i])
+ return i;
+
+ return -1;
+}
+
+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)
+{
+ struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
+ struct sja1105_l2_policing_entry *policing;
+ bool new_rule = false;
+ unsigned long p;
+ int rc;
+
+ if (!rule) {
+ rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+ if (!rule)
+ return -ENOMEM;
+
+ rule->cookie = cookie;
+ rule->type = SJA1105_RULE_BCAST_POLICER;
+ rule->bcast_pol.sharindx = sja1105_find_free_l2_policer(priv);
+ new_rule = true;
+ }
+
+ if (rule->bcast_pol.sharindx == -1) {
+ NL_SET_ERR_MSG_MOD(extack, "No more L2 policers free");
+ rc = -ENOSPC;
+ goto out;
+ }
+
+ policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
+
+ if (policing[(SJA1105_NUM_PORTS * SJA1105_NUM_TC) + port].sharindx != port) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Port already has a broadcast policer");
+ rc = -EEXIST;
+ goto out;
+ }
+
+ rule->port_mask |= BIT(port);
+
+ /* Make the broadcast policers of all ports attached to this block
+ * point to the newly allocated policer
+ */
+ for_each_set_bit(p, &rule->port_mask, SJA1105_NUM_PORTS) {
+ int bcast = (SJA1105_NUM_PORTS * SJA1105_NUM_TC) + p;
+
+ policing[bcast].sharindx = rule->bcast_pol.sharindx;
+ }
+
+ 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);
+ /* TODO: support per-flow MTU */
+ policing[rule->bcast_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
+ ETH_FCS_LEN;
+
+ rc = sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
+
+out:
+ if (rc == 0 && new_rule) {
+ priv->flow_block.l2_policer_used[rule->bcast_pol.sharindx] = true;
+ list_add(&rule->list, &priv->flow_block.rules);
+ } else if (new_rule) {
+ kfree(rule);
+ }
+
+ return rc;
+}
+
+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)
+{
+ struct sja1105_rule *rule = sja1105_rule_find(priv, cookie);
+ struct sja1105_l2_policing_entry *policing;
+ bool new_rule = false;
+ unsigned long p;
+ int rc;
+
+ if (!rule) {
+ rule = kzalloc(sizeof(*rule), GFP_KERNEL);
+ if (!rule)
+ return -ENOMEM;
+
+ rule->cookie = cookie;
+ rule->type = SJA1105_RULE_TC_POLICER;
+ rule->tc_pol.sharindx = sja1105_find_free_l2_policer(priv);
+ rule->tc_pol.tc = tc;
+ new_rule = true;
+ }
+
+ if (rule->tc_pol.sharindx == -1) {
+ NL_SET_ERR_MSG_MOD(extack, "No more L2 policers free");
+ rc = -ENOSPC;
+ goto out;
+ }
+
+ policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
+
+ if (policing[(port * SJA1105_NUM_TC) + tc].sharindx != port) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Port-TC pair already has an L2 policer");
+ rc = -EEXIST;
+ goto out;
+ }
+
+ rule->port_mask |= BIT(port);
+
+ /* Make the policers for traffic class @tc of all ports attached to
+ * this block point to the newly allocated policer
+ */
+ for_each_set_bit(p, &rule->port_mask, SJA1105_NUM_PORTS) {
+ int index = (p * SJA1105_NUM_TC) + tc;
+
+ policing[index].sharindx = rule->tc_pol.sharindx;
+ }
+
+ 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);
+ /* TODO: support per-flow MTU */
+ policing[rule->tc_pol.sharindx].maxlen = VLAN_ETH_FRAME_LEN +
+ ETH_FCS_LEN;
+
+ rc = sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
+
+out:
+ if (rc == 0 && new_rule) {
+ priv->flow_block.l2_policer_used[rule->tc_pol.sharindx] = true;
+ list_add(&rule->list, &priv->flow_block.rules);
+ } else if (new_rule) {
+ kfree(rule);
+ }
+
+ return rc;
+}
+
+static int sja1105_flower_parse_policer(struct sja1105_private *priv, int port,
+ struct netlink_ext_ack *extack,
+ struct flow_cls_offload *cls,
+ u64 rate_bytes_per_sec,
+ s64 burst)
+{
+ struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
+ struct flow_dissector *dissector = rule->match.dissector;
+
+ if (dissector->used_keys &
+ ~(BIT(FLOW_DISSECTOR_KEY_BASIC) |
+ BIT(FLOW_DISSECTOR_KEY_CONTROL) |
+ BIT(FLOW_DISSECTOR_KEY_VLAN) |
+ BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS))) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Unsupported keys used");
+ return -EOPNOTSUPP;
+ }
+
+ if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_BASIC)) {
+ struct flow_match_basic match;
+
+ flow_rule_match_basic(rule, &match);
+ if (match.key->n_proto) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Matching on protocol not supported");
+ return -EOPNOTSUPP;
+ }
+ }
+
+ if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ETH_ADDRS)) {
+ u8 bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+ u8 null[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+ struct flow_match_eth_addrs match;
+
+ flow_rule_match_eth_addrs(rule, &match);
+
+ if (!ether_addr_equal_masked(match.key->src, null,
+ match.mask->src)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Matching on source MAC not supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (!ether_addr_equal_masked(match.key->dst, bcast,
+ match.mask->dst)) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Only matching on broadcast DMAC is supported");
+ return -EOPNOTSUPP;
+ }
+
+ return sja1105_setup_bcast_policer(priv, extack, cls->cookie,
+ port, rate_bytes_per_sec,
+ burst);
+ }
+
+ if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_VLAN)) {
+ struct flow_match_vlan match;
+
+ flow_rule_match_vlan(rule, &match);
+
+ if (match.key->vlan_id & match.mask->vlan_id) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Matching on VID is not supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (match.mask->vlan_priority != 0x7) {
+ NL_SET_ERR_MSG_MOD(extack,
+ "Masked matching on PCP is not supported");
+ return -EOPNOTSUPP;
+ }
+
+ return sja1105_setup_tc_policer(priv, extack, cls->cookie, port,
+ match.key->vlan_priority,
+ rate_bytes_per_sec,
+ burst);
+ }
+
+ NL_SET_ERR_MSG_MOD(extack, "Not matching on any known key");
+ return -EOPNOTSUPP;
+}
+
+int sja1105_cls_flower_add(struct dsa_switch *ds, int port,
+ struct flow_cls_offload *cls, bool ingress)
+{
+ struct flow_rule *rule = flow_cls_offload_flow_rule(cls);
+ struct netlink_ext_ack *extack = cls->common.extack;
+ struct sja1105_private *priv = ds->priv;
+ const struct flow_action_entry *act;
+ int rc = -EOPNOTSUPP, i;
+
+ flow_action_for_each(i, act, &rule->action) {
+ switch (act->id) {
+ case FLOW_ACTION_POLICE:
+ rc = sja1105_flower_parse_policer(priv, port, extack, cls,
+ act->police.rate_bytes_ps,
+ act->police.burst);
+ break;
+ default:
+ NL_SET_ERR_MSG_MOD(extack,
+ "Action not supported");
+ break;
+ }
+ }
+
+ return rc;
+}
+
+int sja1105_cls_flower_del(struct dsa_switch *ds, int port,
+ struct flow_cls_offload *cls, bool ingress)
+{
+ struct sja1105_private *priv = ds->priv;
+ struct sja1105_rule *rule = sja1105_rule_find(priv, cls->cookie);
+ struct sja1105_l2_policing_entry *policing;
+ int old_sharindx;
+
+ if (!rule)
+ return 0;
+
+ policing = priv->static_config.tables[BLK_IDX_L2_POLICING].entries;
+
+ if (rule->type == SJA1105_RULE_BCAST_POLICER) {
+ int bcast = (SJA1105_NUM_PORTS * SJA1105_NUM_TC) + port;
+
+ old_sharindx = policing[bcast].sharindx;
+ policing[bcast].sharindx = port;
+ } else if (rule->type == SJA1105_RULE_TC_POLICER) {
+ int index = (port * SJA1105_NUM_TC) + rule->tc_pol.tc;
+
+ old_sharindx = policing[index].sharindx;
+ policing[index].sharindx = port;
+ } else {
+ return -EINVAL;
+ }
+
+ rule->port_mask &= ~BIT(port);
+ if (!rule->port_mask) {
+ priv->flow_block.l2_policer_used[old_sharindx] = false;
+ list_del(&rule->list);
+ kfree(rule);
+ }
+
+ return sja1105_static_config_reload(priv, SJA1105_BEST_EFFORT_POLICING);
+}
+
+void sja1105_flower_setup(struct dsa_switch *ds)
+{
+ struct sja1105_private *priv = ds->priv;
+ int port;
+
+ INIT_LIST_HEAD(&priv->flow_block.rules);
+
+ for (port = 0; port < SJA1105_NUM_PORTS; port++)
+ priv->flow_block.l2_policer_used[port] = true;
+}
+
+void sja1105_flower_teardown(struct dsa_switch *ds)
+{
+ struct sja1105_private *priv = ds->priv;
+ struct sja1105_rule *rule;
+ struct list_head *pos, *n;
+
+ list_for_each_safe(pos, n, &priv->flow_block.rules) {
+ rule = list_entry(pos, struct sja1105_rule, list);
+ list_del(&rule->list);
+ kfree(rule);
+ }
+}
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