1// SPDX-License-Identifier: GPL-2.0+
2
3#include <linux/if_bridge.h>
4
5#include "lan966x_main.h"
6
7static void lan966x_lag_set_aggr_pgids(struct lan966x *lan966x)
8{
9 u32 visited = GENMASK(lan966x->num_phys_ports - 1, 0);
10 int p, lag, i;
11
12 /* Reset destination and aggregation PGIDS */
13 for (p = 0; p < lan966x->num_phys_ports; ++p)
14 lan_wr(ANA_PGID_PGID_SET(BIT(p)),
15 lan966x, ANA_PGID(p));
16
17 for (p = PGID_AGGR; p < PGID_SRC; ++p)
18 lan_wr(ANA_PGID_PGID_SET(visited),
19 lan966x, ANA_PGID(p));
20
21 /* The visited ports bitmask holds the list of ports offloading any
22 * bonding interface. Initially we mark all these ports as unvisited,
23 * then every time we visit a port in this bitmask, we know that it is
24 * the lowest numbered port, i.e. the one whose logical ID == physical
25 * port ID == LAG ID. So we mark as visited all further ports in the
26 * bitmask that are offloading the same bonding interface. This way,
27 * we set up the aggregation PGIDs only once per bonding interface.
28 */
29 for (p = 0; p < lan966x->num_phys_ports; ++p) {
30 struct lan966x_port *port = lan966x->ports[p];
31
32 if (!port || !port->bond)
33 continue;
34
35 visited &= ~BIT(p);
36 }
37
38 /* Now, set PGIDs for each active LAG */
39 for (lag = 0; lag < lan966x->num_phys_ports; ++lag) {
40 struct lan966x_port *port = lan966x->ports[lag];
41 int num_active_ports = 0;
42 struct net_device *bond;
43 unsigned long bond_mask;
44 u8 aggr_idx[16];
45
46 if (!port || !port->bond || (visited & BIT(lag)))
47 continue;
48
49 bond = port->bond;
50 bond_mask = lan966x_lag_get_mask(lan966x, bond);
51
52 for_each_set_bit(p, &bond_mask, lan966x->num_phys_ports) {
53 struct lan966x_port *port = lan966x->ports[p];
54
55 if (!port)
56 continue;
57
58 lan_wr(ANA_PGID_PGID_SET(bond_mask),
59 lan966x, ANA_PGID(p));
60 if (port->lag_tx_active)
61 aggr_idx[num_active_ports++] = p;
62 }
63
64 for (i = PGID_AGGR; i < PGID_SRC; ++i) {
65 u32 ac;
66
67 ac = lan_rd(lan966x, ANA_PGID(i));
68 ac &= ~bond_mask;
69 /* Don't do division by zero if there was no active
70 * port. Just make all aggregation codes zero.
71 */
72 if (num_active_ports)
73 ac |= BIT(aggr_idx[i % num_active_ports]);
74 lan_wr(ANA_PGID_PGID_SET(ac),
75 lan966x, ANA_PGID(i));
76 }
77
78 /* Mark all ports in the same LAG as visited to avoid applying
79 * the same config again.
80 */
81 for (p = lag; p < lan966x->num_phys_ports; p++) {
82 struct lan966x_port *port = lan966x->ports[p];
83
84 if (!port)
85 continue;
86
87 if (port->bond == bond)
88 visited |= BIT(p);
89 }
90 }
91}
92
93static void lan966x_lag_set_port_ids(struct lan966x *lan966x)
94{
95 struct lan966x_port *port;
96 u32 bond_mask;
97 u32 lag_id;
98 int p;
99
100 for (p = 0; p < lan966x->num_phys_ports; ++p) {
101 port = lan966x->ports[p];
102 if (!port)
103 continue;
104
105 lag_id = port->chip_port;
106
107 bond_mask = lan966x_lag_get_mask(lan966x, bond: port->bond);
108 if (bond_mask)
109 lag_id = __ffs(bond_mask);
110
111 lan_rmw(ANA_PORT_CFG_PORTID_VAL_SET(lag_id),
112 ANA_PORT_CFG_PORTID_VAL,
113 lan966x, ANA_PORT_CFG(port->chip_port));
114 }
115}
116
117static void lan966x_lag_update_ids(struct lan966x *lan966x)
118{
119 lan966x_lag_set_port_ids(lan966x);
120 lan966x_update_fwd_mask(lan966x);
121 lan966x_lag_set_aggr_pgids(lan966x);
122}
123
124int lan966x_lag_port_join(struct lan966x_port *port,
125 struct net_device *brport_dev,
126 struct net_device *bond,
127 struct netlink_ext_ack *extack)
128{
129 struct lan966x *lan966x = port->lan966x;
130 struct net_device *dev = port->dev;
131 u32 lag_id = -1;
132 u32 bond_mask;
133 int err;
134
135 bond_mask = lan966x_lag_get_mask(lan966x, bond);
136 if (bond_mask)
137 lag_id = __ffs(bond_mask);
138
139 port->bond = bond;
140 lan966x_lag_update_ids(lan966x);
141
142 err = switchdev_bridge_port_offload(brport_dev, dev, ctx: port,
143 atomic_nb: &lan966x_switchdev_nb,
144 blocking_nb: &lan966x_switchdev_blocking_nb,
145 tx_fwd_offload: false, extack);
146 if (err)
147 goto out;
148
149 lan966x_port_stp_state_set(port, state: br_port_get_stp_state(dev: brport_dev));
150
151 if (lan966x_lag_first_port(lag: port->bond, dev: port->dev) &&
152 lag_id != -1)
153 lan966x_mac_lag_replace_port_entry(lan966x,
154 src: lan966x->ports[lag_id],
155 dst: port);
156
157 return 0;
158
159out:
160 port->bond = NULL;
161 lan966x_lag_update_ids(lan966x);
162
163 return err;
164}
165
166void lan966x_lag_port_leave(struct lan966x_port *port, struct net_device *bond)
167{
168 struct lan966x *lan966x = port->lan966x;
169 u32 bond_mask;
170 u32 lag_id;
171
172 if (lan966x_lag_first_port(lag: port->bond, dev: port->dev)) {
173 bond_mask = lan966x_lag_get_mask(lan966x, bond: port->bond);
174 bond_mask &= ~BIT(port->chip_port);
175 if (bond_mask) {
176 lag_id = __ffs(bond_mask);
177 lan966x_mac_lag_replace_port_entry(lan966x, src: port,
178 dst: lan966x->ports[lag_id]);
179 } else {
180 lan966x_mac_lag_remove_port_entry(lan966x, src: port);
181 }
182 }
183
184 port->bond = NULL;
185 lan966x_lag_update_ids(lan966x);
186 lan966x_port_stp_state_set(port, BR_STATE_FORWARDING);
187}
188
189static bool lan966x_lag_port_check_hash_types(struct lan966x *lan966x,
190 enum netdev_lag_hash hash_type)
191{
192 int p;
193
194 for (p = 0; p < lan966x->num_phys_ports; ++p) {
195 struct lan966x_port *port = lan966x->ports[p];
196
197 if (!port || !port->bond)
198 continue;
199
200 if (port->hash_type != hash_type)
201 return false;
202 }
203
204 return true;
205}
206
207int lan966x_lag_port_prechangeupper(struct net_device *dev,
208 struct netdev_notifier_changeupper_info *info)
209{
210 struct lan966x_port *port = netdev_priv(dev);
211 struct lan966x *lan966x = port->lan966x;
212 struct netdev_lag_upper_info *lui;
213 struct netlink_ext_ack *extack;
214
215 extack = netdev_notifier_info_to_extack(info: &info->info);
216 lui = info->upper_info;
217 if (!lui) {
218 port->hash_type = NETDEV_LAG_HASH_NONE;
219 return NOTIFY_DONE;
220 }
221
222 if (lui->tx_type != NETDEV_LAG_TX_TYPE_HASH) {
223 NL_SET_ERR_MSG_MOD(extack,
224 "LAG device using unsupported Tx type");
225 return -EINVAL;
226 }
227
228 if (!lan966x_lag_port_check_hash_types(lan966x, hash_type: lui->hash_type)) {
229 NL_SET_ERR_MSG_MOD(extack,
230 "LAG devices can have only the same hash_type");
231 return -EINVAL;
232 }
233
234 switch (lui->hash_type) {
235 case NETDEV_LAG_HASH_L2:
236 lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) |
237 ANA_AGGR_CFG_AC_SMAC_ENA_SET(1),
238 lan966x, ANA_AGGR_CFG);
239 break;
240 case NETDEV_LAG_HASH_L34:
241 lan_wr(ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) |
242 ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1) |
243 ANA_AGGR_CFG_AC_IP4_SIPDIP_ENA_SET(1),
244 lan966x, ANA_AGGR_CFG);
245 break;
246 case NETDEV_LAG_HASH_L23:
247 lan_wr(ANA_AGGR_CFG_AC_DMAC_ENA_SET(1) |
248 ANA_AGGR_CFG_AC_SMAC_ENA_SET(1) |
249 ANA_AGGR_CFG_AC_IP6_TCPUDP_ENA_SET(1) |
250 ANA_AGGR_CFG_AC_IP4_TCPUDP_ENA_SET(1),
251 lan966x, ANA_AGGR_CFG);
252 break;
253 default:
254 NL_SET_ERR_MSG_MOD(extack,
255 "LAG device using unsupported hash type");
256 return -EINVAL;
257 }
258
259 port->hash_type = lui->hash_type;
260
261 return NOTIFY_OK;
262}
263
264int lan966x_lag_port_changelowerstate(struct net_device *dev,
265 struct netdev_notifier_changelowerstate_info *info)
266{
267 struct netdev_lag_lower_state_info *lag = info->lower_state_info;
268 struct lan966x_port *port = netdev_priv(dev);
269 struct lan966x *lan966x = port->lan966x;
270 bool is_active;
271
272 if (!port->bond)
273 return NOTIFY_DONE;
274
275 is_active = lag->link_up && lag->tx_enabled;
276 if (port->lag_tx_active == is_active)
277 return NOTIFY_DONE;
278
279 port->lag_tx_active = is_active;
280 lan966x_lag_set_aggr_pgids(lan966x);
281
282 return NOTIFY_OK;
283}
284
285int lan966x_lag_netdev_prechangeupper(struct net_device *dev,
286 struct netdev_notifier_changeupper_info *info)
287{
288 struct lan966x_port *port;
289 struct net_device *lower;
290 struct list_head *iter;
291 int err;
292
293 netdev_for_each_lower_dev(dev, lower, iter) {
294 if (!lan966x_netdevice_check(dev: lower))
295 continue;
296
297 port = netdev_priv(dev: lower);
298 if (port->bond != dev)
299 continue;
300
301 err = lan966x_port_prechangeupper(dev: lower, brport_dev: dev, info);
302 if (err)
303 return err;
304 }
305
306 return NOTIFY_DONE;
307}
308
309int lan966x_lag_netdev_changeupper(struct net_device *dev,
310 struct netdev_notifier_changeupper_info *info)
311{
312 struct lan966x_port *port;
313 struct net_device *lower;
314 struct list_head *iter;
315 int err;
316
317 netdev_for_each_lower_dev(dev, lower, iter) {
318 if (!lan966x_netdevice_check(dev: lower))
319 continue;
320
321 port = netdev_priv(dev: lower);
322 if (port->bond != dev)
323 continue;
324
325 err = lan966x_port_changeupper(dev: lower, brport_dev: dev, info);
326 if (err)
327 return err;
328 }
329
330 return NOTIFY_DONE;
331}
332
333bool lan966x_lag_first_port(struct net_device *lag, struct net_device *dev)
334{
335 struct lan966x_port *port = netdev_priv(dev);
336 struct lan966x *lan966x = port->lan966x;
337 unsigned long bond_mask;
338
339 if (port->bond != lag)
340 return false;
341
342 bond_mask = lan966x_lag_get_mask(lan966x, bond: lag);
343 if (bond_mask && port->chip_port == __ffs(bond_mask))
344 return true;
345
346 return false;
347}
348
349u32 lan966x_lag_get_mask(struct lan966x *lan966x, struct net_device *bond)
350{
351 struct lan966x_port *port;
352 u32 mask = 0;
353 int p;
354
355 if (!bond)
356 return mask;
357
358 for (p = 0; p < lan966x->num_phys_ports; p++) {
359 port = lan966x->ports[p];
360 if (!port)
361 continue;
362
363 if (port->bond == bond)
364 mask |= BIT(p);
365 }
366
367 return mask;
368}
369

source code of linux/drivers/net/ethernet/microchip/lan966x/lan966x_lag.c