1// SPDX-License-Identifier: GPL-2.0+
2
3#include <net/switchdev.h>
4
5#include "lan966x_main.h"
6
7struct lan966x_fdb_event_work {
8 struct work_struct work;
9 struct switchdev_notifier_fdb_info fdb_info;
10 struct net_device *dev;
11 struct net_device *orig_dev;
12 struct lan966x *lan966x;
13 unsigned long event;
14};
15
16struct lan966x_fdb_entry {
17 struct list_head list;
18 unsigned char mac[ETH_ALEN] __aligned(2);
19 u16 vid;
20 u32 references;
21};
22
23static struct lan966x_fdb_entry *
24lan966x_fdb_find_entry(struct lan966x *lan966x,
25 struct switchdev_notifier_fdb_info *fdb_info)
26{
27 struct lan966x_fdb_entry *fdb_entry;
28
29 list_for_each_entry(fdb_entry, &lan966x->fdb_entries, list) {
30 if (fdb_entry->vid == fdb_info->vid &&
31 ether_addr_equal(addr1: fdb_entry->mac, addr2: fdb_info->addr))
32 return fdb_entry;
33 }
34
35 return NULL;
36}
37
38static void lan966x_fdb_add_entry(struct lan966x *lan966x,
39 struct switchdev_notifier_fdb_info *fdb_info)
40{
41 struct lan966x_fdb_entry *fdb_entry;
42
43 fdb_entry = lan966x_fdb_find_entry(lan966x, fdb_info);
44 if (fdb_entry) {
45 fdb_entry->references++;
46 return;
47 }
48
49 fdb_entry = kzalloc(size: sizeof(*fdb_entry), GFP_KERNEL);
50 if (!fdb_entry)
51 return;
52
53 ether_addr_copy(dst: fdb_entry->mac, src: fdb_info->addr);
54 fdb_entry->vid = fdb_info->vid;
55 fdb_entry->references = 1;
56 list_add_tail(new: &fdb_entry->list, head: &lan966x->fdb_entries);
57}
58
59static bool lan966x_fdb_del_entry(struct lan966x *lan966x,
60 struct switchdev_notifier_fdb_info *fdb_info)
61{
62 struct lan966x_fdb_entry *fdb_entry, *tmp;
63
64 list_for_each_entry_safe(fdb_entry, tmp, &lan966x->fdb_entries,
65 list) {
66 if (fdb_entry->vid == fdb_info->vid &&
67 ether_addr_equal(addr1: fdb_entry->mac, addr2: fdb_info->addr)) {
68 fdb_entry->references--;
69 if (!fdb_entry->references) {
70 list_del(entry: &fdb_entry->list);
71 kfree(objp: fdb_entry);
72 return true;
73 }
74 break;
75 }
76 }
77
78 return false;
79}
80
81void lan966x_fdb_write_entries(struct lan966x *lan966x, u16 vid)
82{
83 struct lan966x_fdb_entry *fdb_entry;
84
85 list_for_each_entry(fdb_entry, &lan966x->fdb_entries, list) {
86 if (fdb_entry->vid != vid)
87 continue;
88
89 lan966x_mac_cpu_learn(lan966x, addr: fdb_entry->mac, vid: fdb_entry->vid);
90 }
91}
92
93void lan966x_fdb_erase_entries(struct lan966x *lan966x, u16 vid)
94{
95 struct lan966x_fdb_entry *fdb_entry;
96
97 list_for_each_entry(fdb_entry, &lan966x->fdb_entries, list) {
98 if (fdb_entry->vid != vid)
99 continue;
100
101 lan966x_mac_cpu_forget(lan966x, addr: fdb_entry->mac, vid: fdb_entry->vid);
102 }
103}
104
105static void lan966x_fdb_purge_entries(struct lan966x *lan966x)
106{
107 struct lan966x_fdb_entry *fdb_entry, *tmp;
108
109 list_for_each_entry_safe(fdb_entry, tmp, &lan966x->fdb_entries, list) {
110 list_del(entry: &fdb_entry->list);
111 kfree(objp: fdb_entry);
112 }
113}
114
115int lan966x_fdb_init(struct lan966x *lan966x)
116{
117 INIT_LIST_HEAD(list: &lan966x->fdb_entries);
118 lan966x->fdb_work = alloc_ordered_workqueue("lan966x_order", 0);
119 if (!lan966x->fdb_work)
120 return -ENOMEM;
121
122 return 0;
123}
124
125void lan966x_fdb_deinit(struct lan966x *lan966x)
126{
127 destroy_workqueue(wq: lan966x->fdb_work);
128 lan966x_fdb_purge_entries(lan966x);
129}
130
131void lan966x_fdb_flush_workqueue(struct lan966x *lan966x)
132{
133 flush_workqueue(lan966x->fdb_work);
134}
135
136static void lan966x_fdb_port_event_work(struct lan966x_fdb_event_work *fdb_work)
137{
138 struct switchdev_notifier_fdb_info *fdb_info;
139 struct lan966x_port *port;
140 struct lan966x *lan966x;
141
142 lan966x = fdb_work->lan966x;
143 port = netdev_priv(dev: fdb_work->orig_dev);
144 fdb_info = &fdb_work->fdb_info;
145
146 switch (fdb_work->event) {
147 case SWITCHDEV_FDB_ADD_TO_DEVICE:
148 if (!fdb_info->added_by_user)
149 break;
150 lan966x_mac_add_entry(lan966x, port, addr: fdb_info->addr,
151 vid: fdb_info->vid);
152 break;
153 case SWITCHDEV_FDB_DEL_TO_DEVICE:
154 if (!fdb_info->added_by_user)
155 break;
156 lan966x_mac_del_entry(lan966x, addr: fdb_info->addr,
157 vid: fdb_info->vid);
158 break;
159 }
160}
161
162static void lan966x_fdb_bridge_event_work(struct lan966x_fdb_event_work *fdb_work)
163{
164 struct switchdev_notifier_fdb_info *fdb_info;
165 struct lan966x *lan966x;
166 int ret;
167
168 lan966x = fdb_work->lan966x;
169 fdb_info = &fdb_work->fdb_info;
170
171 /* In case the bridge is called */
172 switch (fdb_work->event) {
173 case SWITCHDEV_FDB_ADD_TO_DEVICE:
174 /* If there is no front port in this vlan, there is no
175 * point to copy the frame to CPU because it would be
176 * just dropped at later point. So add it only if
177 * there is a port but it is required to store the fdb
178 * entry for later point when a port actually gets in
179 * the vlan.
180 */
181 lan966x_fdb_add_entry(lan966x, fdb_info);
182 if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
183 vid: fdb_info->vid))
184 break;
185
186 lan966x_mac_cpu_learn(lan966x, addr: fdb_info->addr,
187 vid: fdb_info->vid);
188 break;
189 case SWITCHDEV_FDB_DEL_TO_DEVICE:
190 ret = lan966x_fdb_del_entry(lan966x, fdb_info);
191 if (!lan966x_vlan_cpu_member_cpu_vlan_mask(lan966x,
192 vid: fdb_info->vid))
193 break;
194
195 if (ret)
196 lan966x_mac_cpu_forget(lan966x, addr: fdb_info->addr,
197 vid: fdb_info->vid);
198 break;
199 }
200}
201
202static void lan966x_fdb_lag_event_work(struct lan966x_fdb_event_work *fdb_work)
203{
204 struct switchdev_notifier_fdb_info *fdb_info;
205 struct lan966x_port *port;
206 struct lan966x *lan966x;
207
208 if (!lan966x_lag_first_port(lag: fdb_work->orig_dev, dev: fdb_work->dev))
209 return;
210
211 lan966x = fdb_work->lan966x;
212 port = netdev_priv(dev: fdb_work->dev);
213 fdb_info = &fdb_work->fdb_info;
214
215 switch (fdb_work->event) {
216 case SWITCHDEV_FDB_ADD_TO_DEVICE:
217 if (!fdb_info->added_by_user)
218 break;
219 lan966x_mac_add_entry(lan966x, port, addr: fdb_info->addr,
220 vid: fdb_info->vid);
221 break;
222 case SWITCHDEV_FDB_DEL_TO_DEVICE:
223 if (!fdb_info->added_by_user)
224 break;
225 lan966x_mac_del_entry(lan966x, addr: fdb_info->addr, vid: fdb_info->vid);
226 break;
227 }
228}
229
230static void lan966x_fdb_event_work(struct work_struct *work)
231{
232 struct lan966x_fdb_event_work *fdb_work =
233 container_of(work, struct lan966x_fdb_event_work, work);
234
235 if (lan966x_netdevice_check(dev: fdb_work->orig_dev))
236 lan966x_fdb_port_event_work(fdb_work);
237 else if (netif_is_bridge_master(dev: fdb_work->orig_dev))
238 lan966x_fdb_bridge_event_work(fdb_work);
239 else if (netif_is_lag_master(dev: fdb_work->orig_dev))
240 lan966x_fdb_lag_event_work(fdb_work);
241
242 kfree(objp: fdb_work->fdb_info.addr);
243 kfree(objp: fdb_work);
244}
245
246int lan966x_handle_fdb(struct net_device *dev,
247 struct net_device *orig_dev,
248 unsigned long event, const void *ctx,
249 const struct switchdev_notifier_fdb_info *fdb_info)
250{
251 struct lan966x_port *port = netdev_priv(dev);
252 struct lan966x *lan966x = port->lan966x;
253 struct lan966x_fdb_event_work *fdb_work;
254
255 if (ctx && ctx != port)
256 return 0;
257
258 switch (event) {
259 case SWITCHDEV_FDB_ADD_TO_DEVICE:
260 case SWITCHDEV_FDB_DEL_TO_DEVICE:
261 if (lan966x_netdevice_check(dev: orig_dev) &&
262 !fdb_info->added_by_user)
263 break;
264
265 fdb_work = kzalloc(size: sizeof(*fdb_work), GFP_ATOMIC);
266 if (!fdb_work)
267 return -ENOMEM;
268
269 fdb_work->dev = dev;
270 fdb_work->orig_dev = orig_dev;
271 fdb_work->lan966x = lan966x;
272 fdb_work->event = event;
273 INIT_WORK(&fdb_work->work, lan966x_fdb_event_work);
274 memcpy(&fdb_work->fdb_info, fdb_info, sizeof(fdb_work->fdb_info));
275 fdb_work->fdb_info.addr = kzalloc(ETH_ALEN, GFP_ATOMIC);
276 if (!fdb_work->fdb_info.addr)
277 goto err_addr_alloc;
278
279 ether_addr_copy(dst: (u8 *)fdb_work->fdb_info.addr, src: fdb_info->addr);
280
281 queue_work(wq: lan966x->fdb_work, work: &fdb_work->work);
282 break;
283 }
284
285 return 0;
286err_addr_alloc:
287 kfree(objp: fdb_work);
288 return -ENOMEM;
289}
290

source code of linux/drivers/net/ethernet/microchip/lan966x/lan966x_fdb.c