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