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-rw-r--r--drivers/net/ethernet/microchip/lan966x/lan966x_mac.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
new file mode 100644
index 000000000000..ca5f1177963d
--- /dev/null
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -0,0 +1,469 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <net/switchdev.h>
+#include "lan966x_main.h"
+
+#define LAN966X_MAC_COLUMNS 4
+#define MACACCESS_CMD_IDLE 0
+#define MACACCESS_CMD_LEARN 1
+#define MACACCESS_CMD_FORGET 2
+#define MACACCESS_CMD_AGE 3
+#define MACACCESS_CMD_GET_NEXT 4
+#define MACACCESS_CMD_INIT 5
+#define MACACCESS_CMD_READ 6
+#define MACACCESS_CMD_WRITE 7
+#define MACACCESS_CMD_SYNC_GET_NEXT 8
+
+#define LAN966X_MAC_INVALID_ROW -1
+
+struct lan966x_mac_entry {
+ struct list_head list;
+ unsigned char mac[ETH_ALEN] __aligned(2);
+ u16 vid;
+ u16 port_index;
+ int row;
+};
+
+struct lan966x_mac_raw_entry {
+ u32 mach;
+ u32 macl;
+ u32 maca;
+ bool processed;
+};
+
+static int lan966x_mac_get_status(struct lan966x *lan966x)
+{
+ return lan_rd(lan966x, ANA_MACACCESS);
+}
+
+static int lan966x_mac_wait_for_completion(struct lan966x *lan966x)
+{
+ u32 val;
+
+ return readx_poll_timeout(lan966x_mac_get_status,
+ lan966x, val,
+ (ANA_MACACCESS_MAC_TABLE_CMD_GET(val)) ==
+ MACACCESS_CMD_IDLE,
+ TABLE_UPDATE_SLEEP_US, TABLE_UPDATE_TIMEOUT_US);
+}
+
+static void lan966x_mac_select(struct lan966x *lan966x,
+ const unsigned char mac[ETH_ALEN],
+ unsigned int vid)
+{
+ u32 macl = 0, mach = 0;
+
+ /* Set the MAC address to handle and the vlan associated in a format
+ * understood by the hardware.
+ */
+ mach |= vid << 16;
+ mach |= mac[0] << 8;
+ mach |= mac[1] << 0;
+ macl |= mac[2] << 24;
+ macl |= mac[3] << 16;
+ macl |= mac[4] << 8;
+ macl |= mac[5] << 0;
+
+ lan_wr(macl, lan966x, ANA_MACLDATA);
+ lan_wr(mach, lan966x, ANA_MACHDATA);
+}
+
+static int __lan966x_mac_learn(struct lan966x *lan966x, int pgid,
+ bool cpu_copy,
+ const unsigned char mac[ETH_ALEN],
+ unsigned int vid,
+ enum macaccess_entry_type type)
+{
+ lan966x_mac_select(lan966x, mac, vid);
+
+ /* Issue a write command */
+ lan_wr(ANA_MACACCESS_VALID_SET(1) |
+ ANA_MACACCESS_CHANGE2SW_SET(0) |
+ ANA_MACACCESS_MAC_CPU_COPY_SET(cpu_copy) |
+ ANA_MACACCESS_DEST_IDX_SET(pgid) |
+ ANA_MACACCESS_ENTRYTYPE_SET(type) |
+ ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_LEARN),
+ lan966x, ANA_MACACCESS);
+
+ return lan966x_mac_wait_for_completion(lan966x);
+}
+
+/* The mask of the front ports is encoded inside the mac parameter via a call
+ * to lan966x_mdb_encode_mac().
+ */
+int lan966x_mac_ip_learn(struct lan966x *lan966x,
+ bool cpu_copy,
+ const unsigned char mac[ETH_ALEN],
+ unsigned int vid,
+ enum macaccess_entry_type type)
+{
+ WARN_ON(type != ENTRYTYPE_MACV4 && type != ENTRYTYPE_MACV6);
+
+ return __lan966x_mac_learn(lan966x, 0, cpu_copy, mac, vid, type);
+}
+
+int lan966x_mac_learn(struct lan966x *lan966x, int port,
+ const unsigned char mac[ETH_ALEN],
+ unsigned int vid,
+ enum macaccess_entry_type type)
+{
+ WARN_ON(type != ENTRYTYPE_NORMAL && type != ENTRYTYPE_LOCKED);
+
+ return __lan966x_mac_learn(lan966x, port, false, mac, vid, type);
+}
+
+int lan966x_mac_forget(struct lan966x *lan966x,
+ const unsigned char mac[ETH_ALEN],
+ unsigned int vid,
+ enum macaccess_entry_type type)
+{
+ lan966x_mac_select(lan966x, mac, vid);
+
+ /* Issue a forget command */
+ lan_wr(ANA_MACACCESS_ENTRYTYPE_SET(type) |
+ ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_FORGET),
+ lan966x, ANA_MACACCESS);
+
+ return lan966x_mac_wait_for_completion(lan966x);
+}
+
+int lan966x_mac_cpu_learn(struct lan966x *lan966x, const char *addr, u16 vid)
+{
+ return lan966x_mac_learn(lan966x, PGID_CPU, addr, vid, ENTRYTYPE_LOCKED);
+}
+
+int lan966x_mac_cpu_forget(struct lan966x *lan966x, const char *addr, u16 vid)
+{
+ return lan966x_mac_forget(lan966x, addr, vid, ENTRYTYPE_LOCKED);
+}
+
+void lan966x_mac_set_ageing(struct lan966x *lan966x,
+ u32 ageing)
+{
+ lan_rmw(ANA_AUTOAGE_AGE_PERIOD_SET(ageing / 2),
+ ANA_AUTOAGE_AGE_PERIOD,
+ lan966x, ANA_AUTOAGE);
+}
+
+void lan966x_mac_init(struct lan966x *lan966x)
+{
+ /* Clear the MAC table */
+ lan_wr(MACACCESS_CMD_INIT, lan966x, ANA_MACACCESS);
+ lan966x_mac_wait_for_completion(lan966x);
+
+ spin_lock_init(&lan966x->mac_lock);
+ INIT_LIST_HEAD(&lan966x->mac_entries);
+}
+
+static struct lan966x_mac_entry *lan966x_mac_alloc_entry(const unsigned char *mac,
+ u16 vid, u16 port_index)
+{
+ struct lan966x_mac_entry *mac_entry;
+
+ mac_entry = kzalloc(sizeof(*mac_entry), GFP_KERNEL);
+ if (!mac_entry)
+ return NULL;
+
+ memcpy(mac_entry->mac, mac, ETH_ALEN);
+ mac_entry->vid = vid;
+ mac_entry->port_index = port_index;
+ mac_entry->row = LAN966X_MAC_INVALID_ROW;
+ return mac_entry;
+}
+
+static struct lan966x_mac_entry *lan966x_mac_find_entry(struct lan966x *lan966x,
+ const unsigned char *mac,
+ u16 vid, u16 port_index)
+{
+ struct lan966x_mac_entry *res = NULL;
+ struct lan966x_mac_entry *mac_entry;
+
+ spin_lock(&lan966x->mac_lock);
+ list_for_each_entry(mac_entry, &lan966x->mac_entries, list) {
+ if (mac_entry->vid == vid &&
+ ether_addr_equal(mac, mac_entry->mac) &&
+ mac_entry->port_index == port_index) {
+ res = mac_entry;
+ break;
+ }
+ }
+ spin_unlock(&lan966x->mac_lock);
+
+ return res;
+}
+
+static int lan966x_mac_lookup(struct lan966x *lan966x,
+ const unsigned char mac[ETH_ALEN],
+ unsigned int vid, enum macaccess_entry_type type)
+{
+ int ret;
+
+ lan966x_mac_select(lan966x, mac, vid);
+
+ /* Issue a read command */
+ lan_wr(ANA_MACACCESS_ENTRYTYPE_SET(type) |
+ ANA_MACACCESS_VALID_SET(1) |
+ ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_READ),
+ lan966x, ANA_MACACCESS);
+
+ ret = lan966x_mac_wait_for_completion(lan966x);
+ if (ret)
+ return ret;
+
+ return ANA_MACACCESS_VALID_GET(lan_rd(lan966x, ANA_MACACCESS));
+}
+
+static void lan966x_fdb_call_notifiers(enum switchdev_notifier_type type,
+ const char *mac, u16 vid,
+ struct net_device *dev)
+{
+ struct switchdev_notifier_fdb_info info = { 0 };
+
+ info.addr = mac;
+ info.vid = vid;
+ info.offloaded = true;
+ call_switchdev_notifiers(type, dev, &info.info, NULL);
+}
+
+int lan966x_mac_add_entry(struct lan966x *lan966x, struct lan966x_port *port,
+ const unsigned char *addr, u16 vid)
+{
+ struct lan966x_mac_entry *mac_entry;
+
+ if (lan966x_mac_lookup(lan966x, addr, vid, ENTRYTYPE_NORMAL))
+ return 0;
+
+ /* In case the entry already exists, don't add it again to SW,
+ * just update HW, but we need to look in the actual HW because
+ * it is possible for an entry to be learn by HW and before we
+ * get the interrupt the frame will reach CPU and the CPU will
+ * add the entry but without the extern_learn flag.
+ */
+ mac_entry = lan966x_mac_find_entry(lan966x, addr, vid, port->chip_port);
+ if (mac_entry)
+ return lan966x_mac_learn(lan966x, port->chip_port,
+ addr, vid, ENTRYTYPE_LOCKED);
+
+ mac_entry = lan966x_mac_alloc_entry(addr, vid, port->chip_port);
+ if (!mac_entry)
+ return -ENOMEM;
+
+ spin_lock(&lan966x->mac_lock);
+ list_add_tail(&mac_entry->list, &lan966x->mac_entries);
+ spin_unlock(&lan966x->mac_lock);
+
+ lan966x_mac_learn(lan966x, port->chip_port, addr, vid, ENTRYTYPE_LOCKED);
+ lan966x_fdb_call_notifiers(SWITCHDEV_FDB_OFFLOADED, addr, vid, port->dev);
+
+ return 0;
+}
+
+int lan966x_mac_del_entry(struct lan966x *lan966x, const unsigned char *addr,
+ u16 vid)
+{
+ struct lan966x_mac_entry *mac_entry, *tmp;
+
+ spin_lock(&lan966x->mac_lock);
+ list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
+ list) {
+ if (mac_entry->vid == vid &&
+ ether_addr_equal(addr, mac_entry->mac)) {
+ lan966x_mac_forget(lan966x, mac_entry->mac, mac_entry->vid,
+ ENTRYTYPE_LOCKED);
+
+ list_del(&mac_entry->list);
+ kfree(mac_entry);
+ }
+ }
+ spin_unlock(&lan966x->mac_lock);
+
+ return 0;
+}
+
+void lan966x_mac_purge_entries(struct lan966x *lan966x)
+{
+ struct lan966x_mac_entry *mac_entry, *tmp;
+
+ spin_lock(&lan966x->mac_lock);
+ list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries,
+ list) {
+ lan966x_mac_forget(lan966x, mac_entry->mac, mac_entry->vid,
+ ENTRYTYPE_LOCKED);
+
+ list_del(&mac_entry->list);
+ kfree(mac_entry);
+ }
+ spin_unlock(&lan966x->mac_lock);
+}
+
+static void lan966x_mac_notifiers(enum switchdev_notifier_type type,
+ unsigned char *mac, u32 vid,
+ struct net_device *dev)
+{
+ rtnl_lock();
+ lan966x_fdb_call_notifiers(type, mac, vid, dev);
+ rtnl_unlock();
+}
+
+static void lan966x_mac_process_raw_entry(struct lan966x_mac_raw_entry *raw_entry,
+ u8 *mac, u16 *vid, u32 *dest_idx)
+{
+ mac[0] = (raw_entry->mach >> 8) & 0xff;
+ mac[1] = (raw_entry->mach >> 0) & 0xff;
+ mac[2] = (raw_entry->macl >> 24) & 0xff;
+ mac[3] = (raw_entry->macl >> 16) & 0xff;
+ mac[4] = (raw_entry->macl >> 8) & 0xff;
+ mac[5] = (raw_entry->macl >> 0) & 0xff;
+
+ *vid = (raw_entry->mach >> 16) & 0xfff;
+ *dest_idx = ANA_MACACCESS_DEST_IDX_GET(raw_entry->maca);
+}
+
+static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
+ struct lan966x_mac_raw_entry *raw_entries)
+{
+ struct lan966x_mac_entry *mac_entry, *tmp;
+ unsigned char mac[ETH_ALEN] __aligned(2);
+ u32 dest_idx;
+ u32 column;
+ u16 vid;
+
+ spin_lock(&lan966x->mac_lock);
+ list_for_each_entry_safe(mac_entry, tmp, &lan966x->mac_entries, list) {
+ bool found = false;
+
+ if (mac_entry->row != row)
+ continue;
+
+ for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
+ /* All the valid entries are at the start of the row,
+ * so when get one invalid entry it can just skip the
+ * rest of the columns
+ */
+ if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
+ break;
+
+ lan966x_mac_process_raw_entry(&raw_entries[column],
+ mac, &vid, &dest_idx);
+ WARN_ON(dest_idx > lan966x->num_phys_ports);
+
+ /* If the entry in SW is found, then there is nothing
+ * to do
+ */
+ if (mac_entry->vid == vid &&
+ ether_addr_equal(mac_entry->mac, mac) &&
+ mac_entry->port_index == dest_idx) {
+ raw_entries[column].processed = true;
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ /* Notify the bridge that the entry doesn't exist
+ * anymore in the HW and remove the entry from the SW
+ * list
+ */
+ lan966x_mac_notifiers(SWITCHDEV_FDB_DEL_TO_BRIDGE,
+ mac_entry->mac, mac_entry->vid,
+ lan966x->ports[mac_entry->port_index]->dev);
+
+ list_del(&mac_entry->list);
+ kfree(mac_entry);
+ }
+ }
+ spin_unlock(&lan966x->mac_lock);
+
+ /* Now go to the list of columns and see if any entry was not in the SW
+ * list, then that means that the entry is new so it needs to notify the
+ * bridge.
+ */
+ for (column = 0; column < LAN966X_MAC_COLUMNS; ++column) {
+ /* All the valid entries are at the start of the row, so when
+ * get one invalid entry it can just skip the rest of the columns
+ */
+ if (!ANA_MACACCESS_VALID_GET(raw_entries[column].maca))
+ break;
+
+ /* If the entry already exists then don't do anything */
+ if (raw_entries[column].processed)
+ continue;
+
+ lan966x_mac_process_raw_entry(&raw_entries[column],
+ mac, &vid, &dest_idx);
+ WARN_ON(dest_idx > lan966x->num_phys_ports);
+
+ mac_entry = lan966x_mac_alloc_entry(mac, vid, dest_idx);
+ if (!mac_entry)
+ return;
+
+ mac_entry->row = row;
+
+ spin_lock(&lan966x->mac_lock);
+ list_add_tail(&mac_entry->list, &lan966x->mac_entries);
+ spin_unlock(&lan966x->mac_lock);
+
+ lan966x_mac_notifiers(SWITCHDEV_FDB_ADD_TO_BRIDGE,
+ mac, vid, lan966x->ports[dest_idx]->dev);
+ }
+}
+
+irqreturn_t lan966x_mac_irq_handler(struct lan966x *lan966x)
+{
+ struct lan966x_mac_raw_entry entry[LAN966X_MAC_COLUMNS] = { 0 };
+ u32 index, column;
+ bool stop = true;
+ u32 val;
+
+ /* Start the scan from 0, 0 */
+ lan_wr(ANA_MACTINDX_M_INDEX_SET(0) |
+ ANA_MACTINDX_BUCKET_SET(0),
+ lan966x, ANA_MACTINDX);
+
+ while (1) {
+ lan_rmw(ANA_MACACCESS_MAC_TABLE_CMD_SET(MACACCESS_CMD_SYNC_GET_NEXT),
+ ANA_MACACCESS_MAC_TABLE_CMD,
+ lan966x, ANA_MACACCESS);
+ lan966x_mac_wait_for_completion(lan966x);
+
+ val = lan_rd(lan966x, ANA_MACTINDX);
+ index = ANA_MACTINDX_M_INDEX_GET(val);
+ column = ANA_MACTINDX_BUCKET_GET(val);
+
+ /* The SYNC-GET-NEXT returns all the entries(4) in a row in
+ * which is suffered a change. By change it means that new entry
+ * was added or an entry was removed because of ageing.
+ * It would return all the columns for that row. And after that
+ * it would return the next row The stop conditions of the
+ * SYNC-GET-NEXT is when it reaches 'directly' to row 0
+ * column 3. So if SYNC-GET-NEXT returns row 0 and column 0
+ * then it is required to continue to read more even if it
+ * reaches row 0 and column 3.
+ */
+ if (index == 0 && column == 0)
+ stop = false;
+
+ if (column == LAN966X_MAC_COLUMNS - 1 &&
+ index == 0 && stop)
+ break;
+
+ entry[column].mach = lan_rd(lan966x, ANA_MACHDATA);
+ entry[column].macl = lan_rd(lan966x, ANA_MACLDATA);
+ entry[column].maca = lan_rd(lan966x, ANA_MACACCESS);
+
+ /* Once all the columns are read process them */
+ if (column == LAN966X_MAC_COLUMNS - 1) {
+ lan966x_mac_irq_process(lan966x, index, entry);
+ /* A row was processed so it is safe to assume that the
+ * next row/column can be the stop condition
+ */
+ stop = true;
+ }
+ }
+
+ lan_rmw(ANA_ANAINTR_INTR_SET(0),
+ ANA_ANAINTR_INTR,
+ lan966x, ANA_ANAINTR);
+
+ return IRQ_HANDLED;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.