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// 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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