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Merge tag 'wireless-drivers-next-for-davem-2017-08-07' of git://git.kernel.org/pub...
[mirror_ubuntu-bionic-kernel.git] / net / dsa / slave.c
1 /*
2 * net/dsa/slave.c - Slave device handling
3 * Copyright (c) 2008-2009 Marvell Semiconductor
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 */
10
11 #include <linux/list.h>
12 #include <linux/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/phy.h>
15 #include <linux/phy_fixed.h>
16 #include <linux/of_net.h>
17 #include <linux/of_mdio.h>
18 #include <linux/mdio.h>
19 #include <linux/list.h>
20 #include <net/rtnetlink.h>
21 #include <net/pkt_cls.h>
22 #include <net/tc_act/tc_mirred.h>
23 #include <linux/if_bridge.h>
24 #include <linux/netpoll.h>
25
26 #include "dsa_priv.h"
27
28 static bool dsa_slave_dev_check(struct net_device *dev);
29
30 /* slave mii_bus handling ***************************************************/
31 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
32 {
33 struct dsa_switch *ds = bus->priv;
34
35 if (ds->phys_mii_mask & (1 << addr))
36 return ds->ops->phy_read(ds, addr, reg);
37
38 return 0xffff;
39 }
40
41 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
42 {
43 struct dsa_switch *ds = bus->priv;
44
45 if (ds->phys_mii_mask & (1 << addr))
46 return ds->ops->phy_write(ds, addr, reg, val);
47
48 return 0;
49 }
50
51 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
52 {
53 ds->slave_mii_bus->priv = (void *)ds;
54 ds->slave_mii_bus->name = "dsa slave smi";
55 ds->slave_mii_bus->read = dsa_slave_phy_read;
56 ds->slave_mii_bus->write = dsa_slave_phy_write;
57 snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
58 ds->dst->tree, ds->index);
59 ds->slave_mii_bus->parent = ds->dev;
60 ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
61 }
62
63
64 /* slave device handling ****************************************************/
65 static int dsa_slave_get_iflink(const struct net_device *dev)
66 {
67 struct dsa_slave_priv *p = netdev_priv(dev);
68
69 return dsa_master_netdev(p)->ifindex;
70 }
71
72 static int dsa_slave_open(struct net_device *dev)
73 {
74 struct dsa_slave_priv *p = netdev_priv(dev);
75 struct dsa_port *dp = p->dp;
76 struct dsa_switch *ds = dp->ds;
77 struct net_device *master = dsa_master_netdev(p);
78 u8 stp_state = dp->bridge_dev ? BR_STATE_BLOCKING : BR_STATE_FORWARDING;
79 int err;
80
81 if (!(master->flags & IFF_UP))
82 return -ENETDOWN;
83
84 if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
85 err = dev_uc_add(master, dev->dev_addr);
86 if (err < 0)
87 goto out;
88 }
89
90 if (dev->flags & IFF_ALLMULTI) {
91 err = dev_set_allmulti(master, 1);
92 if (err < 0)
93 goto del_unicast;
94 }
95 if (dev->flags & IFF_PROMISC) {
96 err = dev_set_promiscuity(master, 1);
97 if (err < 0)
98 goto clear_allmulti;
99 }
100
101 if (ds->ops->port_enable) {
102 err = ds->ops->port_enable(ds, p->dp->index, p->phy);
103 if (err)
104 goto clear_promisc;
105 }
106
107 dsa_port_set_state_now(p->dp, stp_state);
108
109 if (p->phy)
110 phy_start(p->phy);
111
112 return 0;
113
114 clear_promisc:
115 if (dev->flags & IFF_PROMISC)
116 dev_set_promiscuity(master, -1);
117 clear_allmulti:
118 if (dev->flags & IFF_ALLMULTI)
119 dev_set_allmulti(master, -1);
120 del_unicast:
121 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
122 dev_uc_del(master, dev->dev_addr);
123 out:
124 return err;
125 }
126
127 static int dsa_slave_close(struct net_device *dev)
128 {
129 struct dsa_slave_priv *p = netdev_priv(dev);
130 struct net_device *master = dsa_master_netdev(p);
131 struct dsa_switch *ds = p->dp->ds;
132
133 if (p->phy)
134 phy_stop(p->phy);
135
136 dev_mc_unsync(master, dev);
137 dev_uc_unsync(master, dev);
138 if (dev->flags & IFF_ALLMULTI)
139 dev_set_allmulti(master, -1);
140 if (dev->flags & IFF_PROMISC)
141 dev_set_promiscuity(master, -1);
142
143 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
144 dev_uc_del(master, dev->dev_addr);
145
146 if (ds->ops->port_disable)
147 ds->ops->port_disable(ds, p->dp->index, p->phy);
148
149 dsa_port_set_state_now(p->dp, BR_STATE_DISABLED);
150
151 return 0;
152 }
153
154 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
155 {
156 struct dsa_slave_priv *p = netdev_priv(dev);
157 struct net_device *master = dsa_master_netdev(p);
158
159 if (change & IFF_ALLMULTI)
160 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
161 if (change & IFF_PROMISC)
162 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
163 }
164
165 static void dsa_slave_set_rx_mode(struct net_device *dev)
166 {
167 struct dsa_slave_priv *p = netdev_priv(dev);
168 struct net_device *master = dsa_master_netdev(p);
169
170 dev_mc_sync(master, dev);
171 dev_uc_sync(master, dev);
172 }
173
174 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
175 {
176 struct dsa_slave_priv *p = netdev_priv(dev);
177 struct net_device *master = dsa_master_netdev(p);
178 struct sockaddr *addr = a;
179 int err;
180
181 if (!is_valid_ether_addr(addr->sa_data))
182 return -EADDRNOTAVAIL;
183
184 if (!(dev->flags & IFF_UP))
185 goto out;
186
187 if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
188 err = dev_uc_add(master, addr->sa_data);
189 if (err < 0)
190 return err;
191 }
192
193 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
194 dev_uc_del(master, dev->dev_addr);
195
196 out:
197 ether_addr_copy(dev->dev_addr, addr->sa_data);
198
199 return 0;
200 }
201
202 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
203 {
204 struct dsa_slave_priv *p = netdev_priv(dev);
205
206 if (p->phy != NULL)
207 return phy_mii_ioctl(p->phy, ifr, cmd);
208
209 return -EOPNOTSUPP;
210 }
211
212 static int dsa_slave_port_attr_set(struct net_device *dev,
213 const struct switchdev_attr *attr,
214 struct switchdev_trans *trans)
215 {
216 struct dsa_slave_priv *p = netdev_priv(dev);
217 struct dsa_port *dp = p->dp;
218 int ret;
219
220 switch (attr->id) {
221 case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
222 ret = dsa_port_set_state(dp, attr->u.stp_state, trans);
223 break;
224 case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
225 ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
226 trans);
227 break;
228 case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
229 ret = dsa_port_ageing_time(dp, attr->u.ageing_time, trans);
230 break;
231 default:
232 ret = -EOPNOTSUPP;
233 break;
234 }
235
236 return ret;
237 }
238
239 static int dsa_slave_port_obj_add(struct net_device *dev,
240 const struct switchdev_obj *obj,
241 struct switchdev_trans *trans)
242 {
243 struct dsa_slave_priv *p = netdev_priv(dev);
244 struct dsa_port *dp = p->dp;
245 int err;
246
247 /* For the prepare phase, ensure the full set of changes is feasable in
248 * one go in order to signal a failure properly. If an operation is not
249 * supported, return -EOPNOTSUPP.
250 */
251
252 switch (obj->id) {
253 case SWITCHDEV_OBJ_ID_PORT_FDB:
254 err = dsa_port_fdb_add(dp, SWITCHDEV_OBJ_PORT_FDB(obj), trans);
255 break;
256 case SWITCHDEV_OBJ_ID_PORT_MDB:
257 err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj), trans);
258 break;
259 case SWITCHDEV_OBJ_ID_PORT_VLAN:
260 err = dsa_port_vlan_add(dp, SWITCHDEV_OBJ_PORT_VLAN(obj),
261 trans);
262 break;
263 default:
264 err = -EOPNOTSUPP;
265 break;
266 }
267
268 return err;
269 }
270
271 static int dsa_slave_port_obj_del(struct net_device *dev,
272 const struct switchdev_obj *obj)
273 {
274 struct dsa_slave_priv *p = netdev_priv(dev);
275 struct dsa_port *dp = p->dp;
276 int err;
277
278 switch (obj->id) {
279 case SWITCHDEV_OBJ_ID_PORT_FDB:
280 err = dsa_port_fdb_del(dp, SWITCHDEV_OBJ_PORT_FDB(obj));
281 break;
282 case SWITCHDEV_OBJ_ID_PORT_MDB:
283 err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
284 break;
285 case SWITCHDEV_OBJ_ID_PORT_VLAN:
286 err = dsa_port_vlan_del(dp, SWITCHDEV_OBJ_PORT_VLAN(obj));
287 break;
288 default:
289 err = -EOPNOTSUPP;
290 break;
291 }
292
293 return err;
294 }
295
296 static int dsa_slave_port_obj_dump(struct net_device *dev,
297 struct switchdev_obj *obj,
298 switchdev_obj_dump_cb_t *cb)
299 {
300 struct dsa_slave_priv *p = netdev_priv(dev);
301 struct dsa_port *dp = p->dp;
302 int err;
303
304 switch (obj->id) {
305 case SWITCHDEV_OBJ_ID_PORT_FDB:
306 err = dsa_port_fdb_dump(dp, SWITCHDEV_OBJ_PORT_FDB(obj), cb);
307 break;
308 case SWITCHDEV_OBJ_ID_PORT_MDB:
309 err = dsa_port_mdb_dump(dp, SWITCHDEV_OBJ_PORT_MDB(obj), cb);
310 break;
311 case SWITCHDEV_OBJ_ID_PORT_VLAN:
312 err = dsa_port_vlan_dump(dp, SWITCHDEV_OBJ_PORT_VLAN(obj), cb);
313 break;
314 default:
315 err = -EOPNOTSUPP;
316 break;
317 }
318
319 return err;
320 }
321
322 static int dsa_slave_port_attr_get(struct net_device *dev,
323 struct switchdev_attr *attr)
324 {
325 struct dsa_slave_priv *p = netdev_priv(dev);
326 struct dsa_switch *ds = p->dp->ds;
327
328 switch (attr->id) {
329 case SWITCHDEV_ATTR_ID_PORT_PARENT_ID:
330 attr->u.ppid.id_len = sizeof(ds->index);
331 memcpy(&attr->u.ppid.id, &ds->index, attr->u.ppid.id_len);
332 break;
333 default:
334 return -EOPNOTSUPP;
335 }
336
337 return 0;
338 }
339
340 static inline netdev_tx_t dsa_netpoll_send_skb(struct dsa_slave_priv *p,
341 struct sk_buff *skb)
342 {
343 #ifdef CONFIG_NET_POLL_CONTROLLER
344 if (p->netpoll)
345 netpoll_send_skb(p->netpoll, skb);
346 #else
347 BUG();
348 #endif
349 return NETDEV_TX_OK;
350 }
351
352 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
353 {
354 struct dsa_slave_priv *p = netdev_priv(dev);
355 struct pcpu_sw_netstats *s;
356 struct sk_buff *nskb;
357
358 s = this_cpu_ptr(p->stats64);
359 u64_stats_update_begin(&s->syncp);
360 s->tx_packets++;
361 s->tx_bytes += skb->len;
362 u64_stats_update_end(&s->syncp);
363
364 /* Transmit function may have to reallocate the original SKB,
365 * in which case it must have freed it. Only free it here on error.
366 */
367 nskb = p->xmit(skb, dev);
368 if (!nskb) {
369 kfree_skb(skb);
370 return NETDEV_TX_OK;
371 }
372
373 /* SKB for netpoll still need to be mangled with the protocol-specific
374 * tag to be successfully transmitted
375 */
376 if (unlikely(netpoll_tx_running(dev)))
377 return dsa_netpoll_send_skb(p, nskb);
378
379 /* Queue the SKB for transmission on the parent interface, but
380 * do not modify its EtherType
381 */
382 nskb->dev = dsa_master_netdev(p);
383 dev_queue_xmit(nskb);
384
385 return NETDEV_TX_OK;
386 }
387
388 /* ethtool operations *******************************************************/
389 static int
390 dsa_slave_get_link_ksettings(struct net_device *dev,
391 struct ethtool_link_ksettings *cmd)
392 {
393 struct dsa_slave_priv *p = netdev_priv(dev);
394
395 if (!p->phy)
396 return -EOPNOTSUPP;
397
398 phy_ethtool_ksettings_get(p->phy, cmd);
399
400 return 0;
401 }
402
403 static int
404 dsa_slave_set_link_ksettings(struct net_device *dev,
405 const struct ethtool_link_ksettings *cmd)
406 {
407 struct dsa_slave_priv *p = netdev_priv(dev);
408
409 if (p->phy != NULL)
410 return phy_ethtool_ksettings_set(p->phy, cmd);
411
412 return -EOPNOTSUPP;
413 }
414
415 static void dsa_slave_get_drvinfo(struct net_device *dev,
416 struct ethtool_drvinfo *drvinfo)
417 {
418 strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
419 strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
420 strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
421 }
422
423 static int dsa_slave_get_regs_len(struct net_device *dev)
424 {
425 struct dsa_slave_priv *p = netdev_priv(dev);
426 struct dsa_switch *ds = p->dp->ds;
427
428 if (ds->ops->get_regs_len)
429 return ds->ops->get_regs_len(ds, p->dp->index);
430
431 return -EOPNOTSUPP;
432 }
433
434 static void
435 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
436 {
437 struct dsa_slave_priv *p = netdev_priv(dev);
438 struct dsa_switch *ds = p->dp->ds;
439
440 if (ds->ops->get_regs)
441 ds->ops->get_regs(ds, p->dp->index, regs, _p);
442 }
443
444 static int dsa_slave_nway_reset(struct net_device *dev)
445 {
446 struct dsa_slave_priv *p = netdev_priv(dev);
447
448 if (p->phy != NULL)
449 return genphy_restart_aneg(p->phy);
450
451 return -EOPNOTSUPP;
452 }
453
454 static u32 dsa_slave_get_link(struct net_device *dev)
455 {
456 struct dsa_slave_priv *p = netdev_priv(dev);
457
458 if (p->phy != NULL) {
459 genphy_update_link(p->phy);
460 return p->phy->link;
461 }
462
463 return -EOPNOTSUPP;
464 }
465
466 static int dsa_slave_get_eeprom_len(struct net_device *dev)
467 {
468 struct dsa_slave_priv *p = netdev_priv(dev);
469 struct dsa_switch *ds = p->dp->ds;
470
471 if (ds->cd && ds->cd->eeprom_len)
472 return ds->cd->eeprom_len;
473
474 if (ds->ops->get_eeprom_len)
475 return ds->ops->get_eeprom_len(ds);
476
477 return 0;
478 }
479
480 static int dsa_slave_get_eeprom(struct net_device *dev,
481 struct ethtool_eeprom *eeprom, u8 *data)
482 {
483 struct dsa_slave_priv *p = netdev_priv(dev);
484 struct dsa_switch *ds = p->dp->ds;
485
486 if (ds->ops->get_eeprom)
487 return ds->ops->get_eeprom(ds, eeprom, data);
488
489 return -EOPNOTSUPP;
490 }
491
492 static int dsa_slave_set_eeprom(struct net_device *dev,
493 struct ethtool_eeprom *eeprom, u8 *data)
494 {
495 struct dsa_slave_priv *p = netdev_priv(dev);
496 struct dsa_switch *ds = p->dp->ds;
497
498 if (ds->ops->set_eeprom)
499 return ds->ops->set_eeprom(ds, eeprom, data);
500
501 return -EOPNOTSUPP;
502 }
503
504 static void dsa_slave_get_strings(struct net_device *dev,
505 uint32_t stringset, uint8_t *data)
506 {
507 struct dsa_slave_priv *p = netdev_priv(dev);
508 struct dsa_switch *ds = p->dp->ds;
509
510 if (stringset == ETH_SS_STATS) {
511 int len = ETH_GSTRING_LEN;
512
513 strncpy(data, "tx_packets", len);
514 strncpy(data + len, "tx_bytes", len);
515 strncpy(data + 2 * len, "rx_packets", len);
516 strncpy(data + 3 * len, "rx_bytes", len);
517 if (ds->ops->get_strings)
518 ds->ops->get_strings(ds, p->dp->index, data + 4 * len);
519 }
520 }
521
522 static void dsa_cpu_port_get_ethtool_stats(struct net_device *dev,
523 struct ethtool_stats *stats,
524 uint64_t *data)
525 {
526 struct dsa_switch_tree *dst = dev->dsa_ptr;
527 struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
528 struct dsa_switch *ds = cpu_dp->ds;
529 s8 cpu_port = cpu_dp->index;
530 int count = 0;
531
532 if (cpu_dp->ethtool_ops.get_sset_count) {
533 count = cpu_dp->ethtool_ops.get_sset_count(dev, ETH_SS_STATS);
534 cpu_dp->ethtool_ops.get_ethtool_stats(dev, stats, data);
535 }
536
537 if (ds->ops->get_ethtool_stats)
538 ds->ops->get_ethtool_stats(ds, cpu_port, data + count);
539 }
540
541 static int dsa_cpu_port_get_sset_count(struct net_device *dev, int sset)
542 {
543 struct dsa_switch_tree *dst = dev->dsa_ptr;
544 struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
545 struct dsa_switch *ds = cpu_dp->ds;
546 int count = 0;
547
548 if (cpu_dp->ethtool_ops.get_sset_count)
549 count += cpu_dp->ethtool_ops.get_sset_count(dev, sset);
550
551 if (sset == ETH_SS_STATS && ds->ops->get_sset_count)
552 count += ds->ops->get_sset_count(ds);
553
554 return count;
555 }
556
557 static void dsa_cpu_port_get_strings(struct net_device *dev,
558 uint32_t stringset, uint8_t *data)
559 {
560 struct dsa_switch_tree *dst = dev->dsa_ptr;
561 struct dsa_port *cpu_dp = dsa_get_cpu_port(dst);
562 struct dsa_switch *ds = cpu_dp->ds;
563 s8 cpu_port = cpu_dp->index;
564 int len = ETH_GSTRING_LEN;
565 int mcount = 0, count;
566 unsigned int i;
567 uint8_t pfx[4];
568 uint8_t *ndata;
569
570 snprintf(pfx, sizeof(pfx), "p%.2d", cpu_port);
571 /* We do not want to be NULL-terminated, since this is a prefix */
572 pfx[sizeof(pfx) - 1] = '_';
573
574 if (cpu_dp->ethtool_ops.get_sset_count) {
575 mcount = cpu_dp->ethtool_ops.get_sset_count(dev, ETH_SS_STATS);
576 cpu_dp->ethtool_ops.get_strings(dev, stringset, data);
577 }
578
579 if (stringset == ETH_SS_STATS && ds->ops->get_strings) {
580 ndata = data + mcount * len;
581 /* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
582 * the output after to prepend our CPU port prefix we
583 * constructed earlier
584 */
585 ds->ops->get_strings(ds, cpu_port, ndata);
586 count = ds->ops->get_sset_count(ds);
587 for (i = 0; i < count; i++) {
588 memmove(ndata + (i * len + sizeof(pfx)),
589 ndata + i * len, len - sizeof(pfx));
590 memcpy(ndata + i * len, pfx, sizeof(pfx));
591 }
592 }
593 }
594
595 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
596 struct ethtool_stats *stats,
597 uint64_t *data)
598 {
599 struct dsa_slave_priv *p = netdev_priv(dev);
600 struct dsa_switch *ds = p->dp->ds;
601 struct pcpu_sw_netstats *s;
602 unsigned int start;
603 int i;
604
605 for_each_possible_cpu(i) {
606 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
607
608 s = per_cpu_ptr(p->stats64, i);
609 do {
610 start = u64_stats_fetch_begin_irq(&s->syncp);
611 tx_packets = s->tx_packets;
612 tx_bytes = s->tx_bytes;
613 rx_packets = s->rx_packets;
614 rx_bytes = s->rx_bytes;
615 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
616 data[0] += tx_packets;
617 data[1] += tx_bytes;
618 data[2] += rx_packets;
619 data[3] += rx_bytes;
620 }
621 if (ds->ops->get_ethtool_stats)
622 ds->ops->get_ethtool_stats(ds, p->dp->index, data + 4);
623 }
624
625 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
626 {
627 struct dsa_slave_priv *p = netdev_priv(dev);
628 struct dsa_switch *ds = p->dp->ds;
629
630 if (sset == ETH_SS_STATS) {
631 int count;
632
633 count = 4;
634 if (ds->ops->get_sset_count)
635 count += ds->ops->get_sset_count(ds);
636
637 return count;
638 }
639
640 return -EOPNOTSUPP;
641 }
642
643 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
644 {
645 struct dsa_slave_priv *p = netdev_priv(dev);
646 struct dsa_switch *ds = p->dp->ds;
647
648 if (ds->ops->get_wol)
649 ds->ops->get_wol(ds, p->dp->index, w);
650 }
651
652 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
653 {
654 struct dsa_slave_priv *p = netdev_priv(dev);
655 struct dsa_switch *ds = p->dp->ds;
656 int ret = -EOPNOTSUPP;
657
658 if (ds->ops->set_wol)
659 ret = ds->ops->set_wol(ds, p->dp->index, w);
660
661 return ret;
662 }
663
664 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
665 {
666 struct dsa_slave_priv *p = netdev_priv(dev);
667 struct dsa_switch *ds = p->dp->ds;
668 int ret;
669
670 /* Port's PHY and MAC both need to be EEE capable */
671 if (!p->phy)
672 return -ENODEV;
673
674 if (!ds->ops->set_mac_eee)
675 return -EOPNOTSUPP;
676
677 ret = ds->ops->set_mac_eee(ds, p->dp->index, e);
678 if (ret)
679 return ret;
680
681 if (e->eee_enabled) {
682 ret = phy_init_eee(p->phy, 0);
683 if (ret)
684 return ret;
685 }
686
687 return phy_ethtool_set_eee(p->phy, e);
688 }
689
690 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
691 {
692 struct dsa_slave_priv *p = netdev_priv(dev);
693 struct dsa_switch *ds = p->dp->ds;
694 int ret;
695
696 /* Port's PHY and MAC both need to be EEE capable */
697 if (!p->phy)
698 return -ENODEV;
699
700 if (!ds->ops->get_mac_eee)
701 return -EOPNOTSUPP;
702
703 ret = ds->ops->get_mac_eee(ds, p->dp->index, e);
704 if (ret)
705 return ret;
706
707 return phy_ethtool_get_eee(p->phy, e);
708 }
709
710 #ifdef CONFIG_NET_POLL_CONTROLLER
711 static int dsa_slave_netpoll_setup(struct net_device *dev,
712 struct netpoll_info *ni)
713 {
714 struct dsa_slave_priv *p = netdev_priv(dev);
715 struct net_device *master = dsa_master_netdev(p);
716 struct netpoll *netpoll;
717 int err = 0;
718
719 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
720 if (!netpoll)
721 return -ENOMEM;
722
723 err = __netpoll_setup(netpoll, master);
724 if (err) {
725 kfree(netpoll);
726 goto out;
727 }
728
729 p->netpoll = netpoll;
730 out:
731 return err;
732 }
733
734 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
735 {
736 struct dsa_slave_priv *p = netdev_priv(dev);
737 struct netpoll *netpoll = p->netpoll;
738
739 if (!netpoll)
740 return;
741
742 p->netpoll = NULL;
743
744 __netpoll_free_async(netpoll);
745 }
746
747 static void dsa_slave_poll_controller(struct net_device *dev)
748 {
749 }
750 #endif
751
752 static int dsa_slave_get_phys_port_name(struct net_device *dev,
753 char *name, size_t len)
754 {
755 struct dsa_slave_priv *p = netdev_priv(dev);
756
757 if (snprintf(name, len, "p%d", p->dp->index) >= len)
758 return -EINVAL;
759
760 return 0;
761 }
762
763 static struct dsa_mall_tc_entry *
764 dsa_slave_mall_tc_entry_find(struct dsa_slave_priv *p,
765 unsigned long cookie)
766 {
767 struct dsa_mall_tc_entry *mall_tc_entry;
768
769 list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
770 if (mall_tc_entry->cookie == cookie)
771 return mall_tc_entry;
772
773 return NULL;
774 }
775
776 static int dsa_slave_add_cls_matchall(struct net_device *dev,
777 struct tc_cls_matchall_offload *cls,
778 bool ingress)
779 {
780 struct dsa_slave_priv *p = netdev_priv(dev);
781 struct dsa_mall_tc_entry *mall_tc_entry;
782 __be16 protocol = cls->common.protocol;
783 struct dsa_switch *ds = p->dp->ds;
784 struct net *net = dev_net(dev);
785 struct dsa_slave_priv *to_p;
786 struct net_device *to_dev;
787 const struct tc_action *a;
788 int err = -EOPNOTSUPP;
789 LIST_HEAD(actions);
790 int ifindex;
791
792 if (!ds->ops->port_mirror_add)
793 return err;
794
795 if (!tcf_exts_has_one_action(cls->exts))
796 return err;
797
798 tcf_exts_to_list(cls->exts, &actions);
799 a = list_first_entry(&actions, struct tc_action, list);
800
801 if (is_tcf_mirred_egress_mirror(a) && protocol == htons(ETH_P_ALL)) {
802 struct dsa_mall_mirror_tc_entry *mirror;
803
804 ifindex = tcf_mirred_ifindex(a);
805 to_dev = __dev_get_by_index(net, ifindex);
806 if (!to_dev)
807 return -EINVAL;
808
809 if (!dsa_slave_dev_check(to_dev))
810 return -EOPNOTSUPP;
811
812 mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
813 if (!mall_tc_entry)
814 return -ENOMEM;
815
816 mall_tc_entry->cookie = cls->cookie;
817 mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
818 mirror = &mall_tc_entry->mirror;
819
820 to_p = netdev_priv(to_dev);
821
822 mirror->to_local_port = to_p->dp->index;
823 mirror->ingress = ingress;
824
825 err = ds->ops->port_mirror_add(ds, p->dp->index, mirror,
826 ingress);
827 if (err) {
828 kfree(mall_tc_entry);
829 return err;
830 }
831
832 list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
833 }
834
835 return 0;
836 }
837
838 static void dsa_slave_del_cls_matchall(struct net_device *dev,
839 struct tc_cls_matchall_offload *cls)
840 {
841 struct dsa_slave_priv *p = netdev_priv(dev);
842 struct dsa_mall_tc_entry *mall_tc_entry;
843 struct dsa_switch *ds = p->dp->ds;
844
845 if (!ds->ops->port_mirror_del)
846 return;
847
848 mall_tc_entry = dsa_slave_mall_tc_entry_find(p, cls->cookie);
849 if (!mall_tc_entry)
850 return;
851
852 list_del(&mall_tc_entry->list);
853
854 switch (mall_tc_entry->type) {
855 case DSA_PORT_MALL_MIRROR:
856 ds->ops->port_mirror_del(ds, p->dp->index,
857 &mall_tc_entry->mirror);
858 break;
859 default:
860 WARN_ON(1);
861 }
862
863 kfree(mall_tc_entry);
864 }
865
866 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
867 struct tc_cls_matchall_offload *cls)
868 {
869 bool ingress = TC_H_MAJ(cls->common.handle) == TC_H_MAJ(TC_H_INGRESS);
870
871 if (cls->common.chain_index)
872 return -EOPNOTSUPP;
873
874 switch (cls->command) {
875 case TC_CLSMATCHALL_REPLACE:
876 return dsa_slave_add_cls_matchall(dev, cls, ingress);
877 case TC_CLSMATCHALL_DESTROY:
878 dsa_slave_del_cls_matchall(dev, cls);
879 return 0;
880 default:
881 return -EOPNOTSUPP;
882 }
883 }
884
885 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
886 void *type_data)
887 {
888 switch (type) {
889 case TC_SETUP_CLSMATCHALL:
890 return dsa_slave_setup_tc_cls_matchall(dev, type_data);
891 default:
892 return -EOPNOTSUPP;
893 }
894 }
895
896 static void dsa_slave_get_stats64(struct net_device *dev,
897 struct rtnl_link_stats64 *stats)
898 {
899 struct dsa_slave_priv *p = netdev_priv(dev);
900 struct pcpu_sw_netstats *s;
901 unsigned int start;
902 int i;
903
904 netdev_stats_to_stats64(stats, &dev->stats);
905 for_each_possible_cpu(i) {
906 u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
907
908 s = per_cpu_ptr(p->stats64, i);
909 do {
910 start = u64_stats_fetch_begin_irq(&s->syncp);
911 tx_packets = s->tx_packets;
912 tx_bytes = s->tx_bytes;
913 rx_packets = s->rx_packets;
914 rx_bytes = s->rx_bytes;
915 } while (u64_stats_fetch_retry_irq(&s->syncp, start));
916
917 stats->tx_packets += tx_packets;
918 stats->tx_bytes += tx_bytes;
919 stats->rx_packets += rx_packets;
920 stats->rx_bytes += rx_bytes;
921 }
922 }
923
924 void dsa_cpu_port_ethtool_init(struct ethtool_ops *ops)
925 {
926 ops->get_sset_count = dsa_cpu_port_get_sset_count;
927 ops->get_ethtool_stats = dsa_cpu_port_get_ethtool_stats;
928 ops->get_strings = dsa_cpu_port_get_strings;
929 }
930
931 static int dsa_slave_get_rxnfc(struct net_device *dev,
932 struct ethtool_rxnfc *nfc, u32 *rule_locs)
933 {
934 struct dsa_slave_priv *p = netdev_priv(dev);
935 struct dsa_switch *ds = p->dp->ds;
936
937 if (!ds->ops->get_rxnfc)
938 return -EOPNOTSUPP;
939
940 return ds->ops->get_rxnfc(ds, p->dp->index, nfc, rule_locs);
941 }
942
943 static int dsa_slave_set_rxnfc(struct net_device *dev,
944 struct ethtool_rxnfc *nfc)
945 {
946 struct dsa_slave_priv *p = netdev_priv(dev);
947 struct dsa_switch *ds = p->dp->ds;
948
949 if (!ds->ops->set_rxnfc)
950 return -EOPNOTSUPP;
951
952 return ds->ops->set_rxnfc(ds, p->dp->index, nfc);
953 }
954
955 static const struct ethtool_ops dsa_slave_ethtool_ops = {
956 .get_drvinfo = dsa_slave_get_drvinfo,
957 .get_regs_len = dsa_slave_get_regs_len,
958 .get_regs = dsa_slave_get_regs,
959 .nway_reset = dsa_slave_nway_reset,
960 .get_link = dsa_slave_get_link,
961 .get_eeprom_len = dsa_slave_get_eeprom_len,
962 .get_eeprom = dsa_slave_get_eeprom,
963 .set_eeprom = dsa_slave_set_eeprom,
964 .get_strings = dsa_slave_get_strings,
965 .get_ethtool_stats = dsa_slave_get_ethtool_stats,
966 .get_sset_count = dsa_slave_get_sset_count,
967 .set_wol = dsa_slave_set_wol,
968 .get_wol = dsa_slave_get_wol,
969 .set_eee = dsa_slave_set_eee,
970 .get_eee = dsa_slave_get_eee,
971 .get_link_ksettings = dsa_slave_get_link_ksettings,
972 .set_link_ksettings = dsa_slave_set_link_ksettings,
973 .get_rxnfc = dsa_slave_get_rxnfc,
974 .set_rxnfc = dsa_slave_set_rxnfc,
975 };
976
977 static const struct net_device_ops dsa_slave_netdev_ops = {
978 .ndo_open = dsa_slave_open,
979 .ndo_stop = dsa_slave_close,
980 .ndo_start_xmit = dsa_slave_xmit,
981 .ndo_change_rx_flags = dsa_slave_change_rx_flags,
982 .ndo_set_rx_mode = dsa_slave_set_rx_mode,
983 .ndo_set_mac_address = dsa_slave_set_mac_address,
984 .ndo_fdb_add = switchdev_port_fdb_add,
985 .ndo_fdb_del = switchdev_port_fdb_del,
986 .ndo_fdb_dump = switchdev_port_fdb_dump,
987 .ndo_do_ioctl = dsa_slave_ioctl,
988 .ndo_get_iflink = dsa_slave_get_iflink,
989 #ifdef CONFIG_NET_POLL_CONTROLLER
990 .ndo_netpoll_setup = dsa_slave_netpoll_setup,
991 .ndo_netpoll_cleanup = dsa_slave_netpoll_cleanup,
992 .ndo_poll_controller = dsa_slave_poll_controller,
993 #endif
994 .ndo_bridge_getlink = switchdev_port_bridge_getlink,
995 .ndo_bridge_setlink = switchdev_port_bridge_setlink,
996 .ndo_bridge_dellink = switchdev_port_bridge_dellink,
997 .ndo_get_phys_port_name = dsa_slave_get_phys_port_name,
998 .ndo_setup_tc = dsa_slave_setup_tc,
999 .ndo_get_stats64 = dsa_slave_get_stats64,
1000 };
1001
1002 static const struct switchdev_ops dsa_slave_switchdev_ops = {
1003 .switchdev_port_attr_get = dsa_slave_port_attr_get,
1004 .switchdev_port_attr_set = dsa_slave_port_attr_set,
1005 .switchdev_port_obj_add = dsa_slave_port_obj_add,
1006 .switchdev_port_obj_del = dsa_slave_port_obj_del,
1007 .switchdev_port_obj_dump = dsa_slave_port_obj_dump,
1008 };
1009
1010 static struct device_type dsa_type = {
1011 .name = "dsa",
1012 };
1013
1014 static void dsa_slave_adjust_link(struct net_device *dev)
1015 {
1016 struct dsa_slave_priv *p = netdev_priv(dev);
1017 struct dsa_switch *ds = p->dp->ds;
1018 unsigned int status_changed = 0;
1019
1020 if (p->old_link != p->phy->link) {
1021 status_changed = 1;
1022 p->old_link = p->phy->link;
1023 }
1024
1025 if (p->old_duplex != p->phy->duplex) {
1026 status_changed = 1;
1027 p->old_duplex = p->phy->duplex;
1028 }
1029
1030 if (p->old_pause != p->phy->pause) {
1031 status_changed = 1;
1032 p->old_pause = p->phy->pause;
1033 }
1034
1035 if (ds->ops->adjust_link && status_changed)
1036 ds->ops->adjust_link(ds, p->dp->index, p->phy);
1037
1038 if (status_changed)
1039 phy_print_status(p->phy);
1040 }
1041
1042 static int dsa_slave_fixed_link_update(struct net_device *dev,
1043 struct fixed_phy_status *status)
1044 {
1045 struct dsa_slave_priv *p;
1046 struct dsa_switch *ds;
1047
1048 if (dev) {
1049 p = netdev_priv(dev);
1050 ds = p->dp->ds;
1051 if (ds->ops->fixed_link_update)
1052 ds->ops->fixed_link_update(ds, p->dp->index, status);
1053 }
1054
1055 return 0;
1056 }
1057
1058 /* slave device setup *******************************************************/
1059 static int dsa_slave_phy_connect(struct dsa_slave_priv *p,
1060 struct net_device *slave_dev,
1061 int addr)
1062 {
1063 struct dsa_switch *ds = p->dp->ds;
1064
1065 p->phy = mdiobus_get_phy(ds->slave_mii_bus, addr);
1066 if (!p->phy) {
1067 netdev_err(slave_dev, "no phy at %d\n", addr);
1068 return -ENODEV;
1069 }
1070
1071 /* Use already configured phy mode */
1072 if (p->phy_interface == PHY_INTERFACE_MODE_NA)
1073 p->phy_interface = p->phy->interface;
1074 return phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
1075 p->phy_interface);
1076 }
1077
1078 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
1079 struct net_device *slave_dev)
1080 {
1081 struct dsa_switch *ds = p->dp->ds;
1082 struct device_node *phy_dn, *port_dn;
1083 bool phy_is_fixed = false;
1084 u32 phy_flags = 0;
1085 int mode, ret;
1086
1087 port_dn = p->dp->dn;
1088 mode = of_get_phy_mode(port_dn);
1089 if (mode < 0)
1090 mode = PHY_INTERFACE_MODE_NA;
1091 p->phy_interface = mode;
1092
1093 phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
1094 if (!phy_dn && of_phy_is_fixed_link(port_dn)) {
1095 /* In the case of a fixed PHY, the DT node associated
1096 * to the fixed PHY is the Port DT node
1097 */
1098 ret = of_phy_register_fixed_link(port_dn);
1099 if (ret) {
1100 netdev_err(slave_dev, "failed to register fixed PHY: %d\n", ret);
1101 return ret;
1102 }
1103 phy_is_fixed = true;
1104 phy_dn = of_node_get(port_dn);
1105 }
1106
1107 if (ds->ops->get_phy_flags)
1108 phy_flags = ds->ops->get_phy_flags(ds, p->dp->index);
1109
1110 if (phy_dn) {
1111 int phy_id = of_mdio_parse_addr(&slave_dev->dev, phy_dn);
1112
1113 /* If this PHY address is part of phys_mii_mask, which means
1114 * that we need to divert reads and writes to/from it, then we
1115 * want to bind this device using the slave MII bus created by
1116 * DSA to make that happen.
1117 */
1118 if (!phy_is_fixed && phy_id >= 0 &&
1119 (ds->phys_mii_mask & (1 << phy_id))) {
1120 ret = dsa_slave_phy_connect(p, slave_dev, phy_id);
1121 if (ret) {
1122 netdev_err(slave_dev, "failed to connect to phy%d: %d\n", phy_id, ret);
1123 of_node_put(phy_dn);
1124 return ret;
1125 }
1126 } else {
1127 p->phy = of_phy_connect(slave_dev, phy_dn,
1128 dsa_slave_adjust_link,
1129 phy_flags,
1130 p->phy_interface);
1131 }
1132
1133 of_node_put(phy_dn);
1134 }
1135
1136 if (p->phy && phy_is_fixed)
1137 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
1138
1139 /* We could not connect to a designated PHY, so use the switch internal
1140 * MDIO bus instead
1141 */
1142 if (!p->phy) {
1143 ret = dsa_slave_phy_connect(p, slave_dev, p->dp->index);
1144 if (ret) {
1145 netdev_err(slave_dev, "failed to connect to port %d: %d\n",
1146 p->dp->index, ret);
1147 if (phy_is_fixed)
1148 of_phy_deregister_fixed_link(port_dn);
1149 return ret;
1150 }
1151 }
1152
1153 phy_attached_info(p->phy);
1154
1155 return 0;
1156 }
1157
1158 static struct lock_class_key dsa_slave_netdev_xmit_lock_key;
1159 static void dsa_slave_set_lockdep_class_one(struct net_device *dev,
1160 struct netdev_queue *txq,
1161 void *_unused)
1162 {
1163 lockdep_set_class(&txq->_xmit_lock,
1164 &dsa_slave_netdev_xmit_lock_key);
1165 }
1166
1167 int dsa_slave_suspend(struct net_device *slave_dev)
1168 {
1169 struct dsa_slave_priv *p = netdev_priv(slave_dev);
1170
1171 netif_device_detach(slave_dev);
1172
1173 if (p->phy) {
1174 phy_stop(p->phy);
1175 p->old_pause = -1;
1176 p->old_link = -1;
1177 p->old_duplex = -1;
1178 phy_suspend(p->phy);
1179 }
1180
1181 return 0;
1182 }
1183
1184 int dsa_slave_resume(struct net_device *slave_dev)
1185 {
1186 struct dsa_slave_priv *p = netdev_priv(slave_dev);
1187
1188 netif_device_attach(slave_dev);
1189
1190 if (p->phy) {
1191 phy_resume(p->phy);
1192 phy_start(p->phy);
1193 }
1194
1195 return 0;
1196 }
1197
1198 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
1199 int port, const char *name)
1200 {
1201 struct dsa_switch_tree *dst = ds->dst;
1202 struct net_device *master;
1203 struct net_device *slave_dev;
1204 struct dsa_slave_priv *p;
1205 struct dsa_port *cpu_dp;
1206 int ret;
1207
1208 cpu_dp = ds->dst->cpu_dp;
1209 master = cpu_dp->netdev;
1210
1211 slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
1212 NET_NAME_UNKNOWN, ether_setup);
1213 if (slave_dev == NULL)
1214 return -ENOMEM;
1215
1216 slave_dev->features = master->vlan_features | NETIF_F_HW_TC;
1217 slave_dev->hw_features |= NETIF_F_HW_TC;
1218 slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
1219 eth_hw_addr_inherit(slave_dev, master);
1220 slave_dev->priv_flags |= IFF_NO_QUEUE;
1221 slave_dev->netdev_ops = &dsa_slave_netdev_ops;
1222 slave_dev->switchdev_ops = &dsa_slave_switchdev_ops;
1223 slave_dev->min_mtu = 0;
1224 slave_dev->max_mtu = ETH_MAX_MTU;
1225 SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
1226
1227 netdev_for_each_tx_queue(slave_dev, dsa_slave_set_lockdep_class_one,
1228 NULL);
1229
1230 SET_NETDEV_DEV(slave_dev, parent);
1231 slave_dev->dev.of_node = ds->ports[port].dn;
1232 slave_dev->vlan_features = master->vlan_features;
1233
1234 p = netdev_priv(slave_dev);
1235 p->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1236 if (!p->stats64) {
1237 free_netdev(slave_dev);
1238 return -ENOMEM;
1239 }
1240 p->dp = &ds->ports[port];
1241 INIT_LIST_HEAD(&p->mall_tc_list);
1242 p->xmit = dst->tag_ops->xmit;
1243
1244 p->old_pause = -1;
1245 p->old_link = -1;
1246 p->old_duplex = -1;
1247
1248 ds->ports[port].netdev = slave_dev;
1249 ret = register_netdev(slave_dev);
1250 if (ret) {
1251 netdev_err(master, "error %d registering interface %s\n",
1252 ret, slave_dev->name);
1253 ds->ports[port].netdev = NULL;
1254 free_percpu(p->stats64);
1255 free_netdev(slave_dev);
1256 return ret;
1257 }
1258
1259 netif_carrier_off(slave_dev);
1260
1261 ret = dsa_slave_phy_setup(p, slave_dev);
1262 if (ret) {
1263 netdev_err(master, "error %d setting up slave phy\n", ret);
1264 unregister_netdev(slave_dev);
1265 free_percpu(p->stats64);
1266 free_netdev(slave_dev);
1267 return ret;
1268 }
1269
1270 return 0;
1271 }
1272
1273 void dsa_slave_destroy(struct net_device *slave_dev)
1274 {
1275 struct dsa_slave_priv *p = netdev_priv(slave_dev);
1276 struct device_node *port_dn;
1277
1278 port_dn = p->dp->dn;
1279
1280 netif_carrier_off(slave_dev);
1281 if (p->phy) {
1282 phy_disconnect(p->phy);
1283
1284 if (of_phy_is_fixed_link(port_dn))
1285 of_phy_deregister_fixed_link(port_dn);
1286 }
1287 unregister_netdev(slave_dev);
1288 free_percpu(p->stats64);
1289 free_netdev(slave_dev);
1290 }
1291
1292 static bool dsa_slave_dev_check(struct net_device *dev)
1293 {
1294 return dev->netdev_ops == &dsa_slave_netdev_ops;
1295 }
1296
1297 static int dsa_slave_changeupper(struct net_device *dev,
1298 struct netdev_notifier_changeupper_info *info)
1299 {
1300 struct dsa_slave_priv *p = netdev_priv(dev);
1301 struct dsa_port *dp = p->dp;
1302 int err = NOTIFY_DONE;
1303
1304 if (netif_is_bridge_master(info->upper_dev)) {
1305 if (info->linking) {
1306 err = dsa_port_bridge_join(dp, info->upper_dev);
1307 err = notifier_from_errno(err);
1308 } else {
1309 dsa_port_bridge_leave(dp, info->upper_dev);
1310 err = NOTIFY_OK;
1311 }
1312 }
1313
1314 return err;
1315 }
1316
1317 static int dsa_slave_netdevice_event(struct notifier_block *nb,
1318 unsigned long event, void *ptr)
1319 {
1320 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1321
1322 if (dev->netdev_ops != &dsa_slave_netdev_ops)
1323 return NOTIFY_DONE;
1324
1325 if (event == NETDEV_CHANGEUPPER)
1326 return dsa_slave_changeupper(dev, ptr);
1327
1328 return NOTIFY_DONE;
1329 }
1330
1331 static struct notifier_block dsa_slave_nb __read_mostly = {
1332 .notifier_call = dsa_slave_netdevice_event,
1333 };
1334
1335 int dsa_slave_register_notifier(void)
1336 {
1337 return register_netdevice_notifier(&dsa_slave_nb);
1338 }
1339
1340 void dsa_slave_unregister_notifier(void)
1341 {
1342 int err;
1343
1344 err = unregister_netdevice_notifier(&dsa_slave_nb);
1345 if (err)
1346 pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
1347 }
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