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// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2022 Gerhard Engleder <gerhard@engleder-embedded.com> */
#include "tsnep.h"
#define ETHER_TYPE_FULL_MASK ((__force __be16)~0)
static void tsnep_enable_rule(struct tsnep_adapter *adapter,
struct tsnep_rxnfc_rule *rule)
{
u8 rx_assign;
void __iomem *addr;
rx_assign = TSNEP_RX_ASSIGN_ACTIVE;
rx_assign |= (rule->queue_index << TSNEP_RX_ASSIGN_QUEUE_SHIFT) &
TSNEP_RX_ASSIGN_QUEUE_MASK;
addr = adapter->addr + TSNEP_RX_ASSIGN_ETHER_TYPE +
TSNEP_RX_ASSIGN_ETHER_TYPE_OFFSET * rule->location;
iowrite16(rule->filter.ether_type, addr);
/* enable rule after all settings are done */
addr = adapter->addr + TSNEP_RX_ASSIGN +
TSNEP_RX_ASSIGN_OFFSET * rule->location;
iowrite8(rx_assign, addr);
}
static void tsnep_disable_rule(struct tsnep_adapter *adapter,
struct tsnep_rxnfc_rule *rule)
{
void __iomem *addr;
addr = adapter->addr + TSNEP_RX_ASSIGN +
TSNEP_RX_ASSIGN_OFFSET * rule->location;
iowrite8(0, addr);
}
static struct tsnep_rxnfc_rule *tsnep_get_rule(struct tsnep_adapter *adapter,
int location)
{
struct tsnep_rxnfc_rule *rule;
list_for_each_entry(rule, &adapter->rxnfc_rules, list) {
if (rule->location == location)
return rule;
if (rule->location > location)
break;
}
return NULL;
}
static void tsnep_add_rule(struct tsnep_adapter *adapter,
struct tsnep_rxnfc_rule *rule)
{
struct tsnep_rxnfc_rule *pred, *cur;
tsnep_enable_rule(adapter, rule);
pred = NULL;
list_for_each_entry(cur, &adapter->rxnfc_rules, list) {
if (cur->location >= rule->location)
break;
pred = cur;
}
list_add(&rule->list, pred ? &pred->list : &adapter->rxnfc_rules);
adapter->rxnfc_count++;
}
static void tsnep_delete_rule(struct tsnep_adapter *adapter,
struct tsnep_rxnfc_rule *rule)
{
tsnep_disable_rule(adapter, rule);
list_del(&rule->list);
adapter->rxnfc_count--;
kfree(rule);
}
static void tsnep_flush_rules(struct tsnep_adapter *adapter)
{
struct tsnep_rxnfc_rule *rule, *tmp;
mutex_lock(&adapter->rxnfc_lock);
list_for_each_entry_safe(rule, tmp, &adapter->rxnfc_rules, list)
tsnep_delete_rule(adapter, rule);
mutex_unlock(&adapter->rxnfc_lock);
}
int tsnep_rxnfc_get_rule(struct tsnep_adapter *adapter,
struct ethtool_rxnfc *cmd)
{
struct ethtool_rx_flow_spec *fsp = &cmd->fs;
struct tsnep_rxnfc_rule *rule = NULL;
cmd->data = adapter->rxnfc_max;
mutex_lock(&adapter->rxnfc_lock);
rule = tsnep_get_rule(adapter, fsp->location);
if (!rule) {
mutex_unlock(&adapter->rxnfc_lock);
return -ENOENT;
}
fsp->flow_type = ETHER_FLOW;
fsp->ring_cookie = rule->queue_index;
if (rule->filter.type == TSNEP_RXNFC_ETHER_TYPE) {
fsp->h_u.ether_spec.h_proto = htons(rule->filter.ether_type);
fsp->m_u.ether_spec.h_proto = ETHER_TYPE_FULL_MASK;
}
mutex_unlock(&adapter->rxnfc_lock);
return 0;
}
int tsnep_rxnfc_get_all(struct tsnep_adapter *adapter,
struct ethtool_rxnfc *cmd,
u32 *rule_locs)
{
struct tsnep_rxnfc_rule *rule;
int count = 0;
cmd->data = adapter->rxnfc_max;
mutex_lock(&adapter->rxnfc_lock);
list_for_each_entry(rule, &adapter->rxnfc_rules, list) {
if (count == cmd->rule_cnt) {
mutex_unlock(&adapter->rxnfc_lock);
return -EMSGSIZE;
}
rule_locs[count] = rule->location;
count++;
}
mutex_unlock(&adapter->rxnfc_lock);
cmd->rule_cnt = count;
return 0;
}
static int tsnep_rxnfc_find_location(struct tsnep_adapter *adapter)
{
struct tsnep_rxnfc_rule *tmp;
int location = 0;
list_for_each_entry(tmp, &adapter->rxnfc_rules, list) {
if (tmp->location == location)
location++;
else
return location;
}
if (location >= adapter->rxnfc_max)
return -ENOSPC;
return location;
}
static void tsnep_rxnfc_init_rule(struct tsnep_rxnfc_rule *rule,
const struct ethtool_rx_flow_spec *fsp)
{
INIT_LIST_HEAD(&rule->list);
rule->queue_index = fsp->ring_cookie;
rule->location = fsp->location;
rule->filter.type = TSNEP_RXNFC_ETHER_TYPE;
rule->filter.ether_type = ntohs(fsp->h_u.ether_spec.h_proto);
}
static int tsnep_rxnfc_check_rule(struct tsnep_adapter *adapter,
struct tsnep_rxnfc_rule *rule)
{
struct net_device *dev = adapter->netdev;
struct tsnep_rxnfc_rule *tmp;
list_for_each_entry(tmp, &adapter->rxnfc_rules, list) {
if (!memcmp(&rule->filter, &tmp->filter, sizeof(rule->filter)) &&
tmp->location != rule->location) {
netdev_dbg(dev, "rule already exists\n");
return -EEXIST;
}
}
return 0;
}
int tsnep_rxnfc_add_rule(struct tsnep_adapter *adapter,
struct ethtool_rxnfc *cmd)
{
struct net_device *netdev = adapter->netdev;
struct ethtool_rx_flow_spec *fsp =
(struct ethtool_rx_flow_spec *)&cmd->fs;
struct tsnep_rxnfc_rule *rule, *old_rule;
int retval;
/* only EtherType is supported */
if (fsp->flow_type != ETHER_FLOW ||
!is_zero_ether_addr(fsp->m_u.ether_spec.h_dest) ||
!is_zero_ether_addr(fsp->m_u.ether_spec.h_source) ||
fsp->m_u.ether_spec.h_proto != ETHER_TYPE_FULL_MASK) {
netdev_dbg(netdev, "only ethernet protocol is supported\n");
return -EOPNOTSUPP;
}
if (fsp->ring_cookie >
(TSNEP_RX_ASSIGN_QUEUE_MASK >> TSNEP_RX_ASSIGN_QUEUE_SHIFT)) {
netdev_dbg(netdev, "invalid action\n");
return -EINVAL;
}
if (fsp->location != RX_CLS_LOC_ANY &&
fsp->location >= adapter->rxnfc_max) {
netdev_dbg(netdev, "invalid location\n");
return -EINVAL;
}
rule = kzalloc(sizeof(*rule), GFP_KERNEL);
if (!rule)
return -ENOMEM;
mutex_lock(&adapter->rxnfc_lock);
if (fsp->location == RX_CLS_LOC_ANY) {
retval = tsnep_rxnfc_find_location(adapter);
if (retval < 0)
goto failed;
fsp->location = retval;
}
tsnep_rxnfc_init_rule(rule, fsp);
retval = tsnep_rxnfc_check_rule(adapter, rule);
if (retval)
goto failed;
old_rule = tsnep_get_rule(adapter, fsp->location);
if (old_rule)
tsnep_delete_rule(adapter, old_rule);
tsnep_add_rule(adapter, rule);
mutex_unlock(&adapter->rxnfc_lock);
return 0;
failed:
mutex_unlock(&adapter->rxnfc_lock);
kfree(rule);
return retval;
}
int tsnep_rxnfc_del_rule(struct tsnep_adapter *adapter,
struct ethtool_rxnfc *cmd)
{
struct ethtool_rx_flow_spec *fsp =
(struct ethtool_rx_flow_spec *)&cmd->fs;
struct tsnep_rxnfc_rule *rule;
mutex_lock(&adapter->rxnfc_lock);
rule = tsnep_get_rule(adapter, fsp->location);
if (!rule) {
mutex_unlock(&adapter->rxnfc_lock);
return -ENOENT;
}
tsnep_delete_rule(adapter, rule);
mutex_unlock(&adapter->rxnfc_lock);
return 0;
}
int tsnep_rxnfc_init(struct tsnep_adapter *adapter)
{
int i;
/* disable all rules */
for (i = 0; i < adapter->rxnfc_max;
i += sizeof(u32) / TSNEP_RX_ASSIGN_OFFSET)
iowrite32(0, adapter->addr + TSNEP_RX_ASSIGN + i);
return 0;
}
void tsnep_rxnfc_cleanup(struct tsnep_adapter *adapter)
{
tsnep_flush_rules(adapter);
}
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