drivers/net/dsa/sja1105/sja1105_flower.c - linux - Git at Google

 // 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);
 	}
 }
	// 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);
	}
	}