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net: dsa: Introduce dsa_is_port_initialized
[deliverable/linux.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 <net/rtnetlink.h>
19 #include <linux/if_bridge.h>
20 #include "dsa_priv.h"
21
22 /* slave mii_bus handling ***************************************************/
23 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
24 {
25 struct dsa_switch *ds = bus->priv;
26
27 if (ds->phys_mii_mask & (1 << addr))
28 return ds->drv->phy_read(ds, addr, reg);
29
30 return 0xffff;
31 }
32
33 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
34 {
35 struct dsa_switch *ds = bus->priv;
36
37 if (ds->phys_mii_mask & (1 << addr))
38 return ds->drv->phy_write(ds, addr, reg, val);
39
40 return 0;
41 }
42
43 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
44 {
45 ds->slave_mii_bus->priv = (void *)ds;
46 ds->slave_mii_bus->name = "dsa slave smi";
47 ds->slave_mii_bus->read = dsa_slave_phy_read;
48 ds->slave_mii_bus->write = dsa_slave_phy_write;
49 snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
50 ds->index, ds->pd->sw_addr);
51 ds->slave_mii_bus->parent = ds->master_dev;
52 ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
53 }
54
55
56 /* slave device handling ****************************************************/
57 static int dsa_slave_init(struct net_device *dev)
58 {
59 struct dsa_slave_priv *p = netdev_priv(dev);
60
61 dev->iflink = p->parent->dst->master_netdev->ifindex;
62
63 return 0;
64 }
65
66 static inline bool dsa_port_is_bridged(struct dsa_slave_priv *p)
67 {
68 return !!p->bridge_dev;
69 }
70
71 static int dsa_slave_open(struct net_device *dev)
72 {
73 struct dsa_slave_priv *p = netdev_priv(dev);
74 struct net_device *master = p->parent->dst->master_netdev;
75 struct dsa_switch *ds = p->parent;
76 u8 stp_state = dsa_port_is_bridged(p) ?
77 BR_STATE_BLOCKING : BR_STATE_FORWARDING;
78 int err;
79
80 if (!(master->flags & IFF_UP))
81 return -ENETDOWN;
82
83 if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
84 err = dev_uc_add(master, dev->dev_addr);
85 if (err < 0)
86 goto out;
87 }
88
89 if (dev->flags & IFF_ALLMULTI) {
90 err = dev_set_allmulti(master, 1);
91 if (err < 0)
92 goto del_unicast;
93 }
94 if (dev->flags & IFF_PROMISC) {
95 err = dev_set_promiscuity(master, 1);
96 if (err < 0)
97 goto clear_allmulti;
98 }
99
100 if (ds->drv->port_enable) {
101 err = ds->drv->port_enable(ds, p->port, p->phy);
102 if (err)
103 goto clear_promisc;
104 }
105
106 if (ds->drv->port_stp_update)
107 ds->drv->port_stp_update(ds, p->port, 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, 0);
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 = p->parent->dst->master_netdev;
131 struct dsa_switch *ds = p->parent;
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->drv->port_disable)
147 ds->drv->port_disable(ds, p->port, p->phy);
148
149 if (ds->drv->port_stp_update)
150 ds->drv->port_stp_update(ds, p->port, BR_STATE_DISABLED);
151
152 return 0;
153 }
154
155 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
156 {
157 struct dsa_slave_priv *p = netdev_priv(dev);
158 struct net_device *master = p->parent->dst->master_netdev;
159
160 if (change & IFF_ALLMULTI)
161 dev_set_allmulti(master, dev->flags & IFF_ALLMULTI ? 1 : -1);
162 if (change & IFF_PROMISC)
163 dev_set_promiscuity(master, dev->flags & IFF_PROMISC ? 1 : -1);
164 }
165
166 static void dsa_slave_set_rx_mode(struct net_device *dev)
167 {
168 struct dsa_slave_priv *p = netdev_priv(dev);
169 struct net_device *master = p->parent->dst->master_netdev;
170
171 dev_mc_sync(master, dev);
172 dev_uc_sync(master, dev);
173 }
174
175 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
176 {
177 struct dsa_slave_priv *p = netdev_priv(dev);
178 struct net_device *master = p->parent->dst->master_netdev;
179 struct sockaddr *addr = a;
180 int err;
181
182 if (!is_valid_ether_addr(addr->sa_data))
183 return -EADDRNOTAVAIL;
184
185 if (!(dev->flags & IFF_UP))
186 goto out;
187
188 if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
189 err = dev_uc_add(master, addr->sa_data);
190 if (err < 0)
191 return err;
192 }
193
194 if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
195 dev_uc_del(master, dev->dev_addr);
196
197 out:
198 ether_addr_copy(dev->dev_addr, addr->sa_data);
199
200 return 0;
201 }
202
203 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
204 {
205 struct dsa_slave_priv *p = netdev_priv(dev);
206
207 if (p->phy != NULL)
208 return phy_mii_ioctl(p->phy, ifr, cmd);
209
210 return -EOPNOTSUPP;
211 }
212
213 /* Return a bitmask of all ports being currently bridged within a given bridge
214 * device. Note that on leave, the mask will still return the bitmask of ports
215 * currently bridged, prior to port removal, and this is exactly what we want.
216 */
217 static u32 dsa_slave_br_port_mask(struct dsa_switch *ds,
218 struct net_device *bridge)
219 {
220 struct dsa_slave_priv *p;
221 unsigned int port;
222 u32 mask = 0;
223
224 for (port = 0; port < DSA_MAX_PORTS; port++) {
225 if (!dsa_is_port_initialized(ds, port))
226 continue;
227
228 p = netdev_priv(ds->ports[port]);
229
230 if (ds->ports[port]->priv_flags & IFF_BRIDGE_PORT &&
231 p->bridge_dev == bridge)
232 mask |= 1 << port;
233 }
234
235 return mask;
236 }
237
238 static int dsa_slave_stp_update(struct net_device *dev, u8 state)
239 {
240 struct dsa_slave_priv *p = netdev_priv(dev);
241 struct dsa_switch *ds = p->parent;
242 int ret = -EOPNOTSUPP;
243
244 if (ds->drv->port_stp_update)
245 ret = ds->drv->port_stp_update(ds, p->port, state);
246
247 return ret;
248 }
249
250 static int dsa_slave_bridge_port_join(struct net_device *dev,
251 struct net_device *br)
252 {
253 struct dsa_slave_priv *p = netdev_priv(dev);
254 struct dsa_switch *ds = p->parent;
255 int ret = -EOPNOTSUPP;
256
257 p->bridge_dev = br;
258
259 if (ds->drv->port_join_bridge)
260 ret = ds->drv->port_join_bridge(ds, p->port,
261 dsa_slave_br_port_mask(ds, br));
262
263 return ret;
264 }
265
266 static int dsa_slave_bridge_port_leave(struct net_device *dev)
267 {
268 struct dsa_slave_priv *p = netdev_priv(dev);
269 struct dsa_switch *ds = p->parent;
270 int ret = -EOPNOTSUPP;
271
272
273 if (ds->drv->port_leave_bridge)
274 ret = ds->drv->port_leave_bridge(ds, p->port,
275 dsa_slave_br_port_mask(ds, p->bridge_dev));
276
277 p->bridge_dev = NULL;
278
279 /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer,
280 * so allow it to be in BR_STATE_FORWARDING to be kept functional
281 */
282 dsa_slave_stp_update(dev, BR_STATE_FORWARDING);
283
284 return ret;
285 }
286
287 static int dsa_slave_parent_id_get(struct net_device *dev,
288 struct netdev_phys_item_id *psid)
289 {
290 struct dsa_slave_priv *p = netdev_priv(dev);
291 struct dsa_switch *ds = p->parent;
292
293 psid->id_len = sizeof(ds->index);
294 memcpy(&psid->id, &ds->index, psid->id_len);
295
296 return 0;
297 }
298
299 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
300 {
301 struct dsa_slave_priv *p = netdev_priv(dev);
302
303 return p->xmit(skb, dev);
304 }
305
306 static netdev_tx_t dsa_slave_notag_xmit(struct sk_buff *skb,
307 struct net_device *dev)
308 {
309 struct dsa_slave_priv *p = netdev_priv(dev);
310
311 skb->dev = p->parent->dst->master_netdev;
312 dev_queue_xmit(skb);
313
314 return NETDEV_TX_OK;
315 }
316
317
318 /* ethtool operations *******************************************************/
319 static int
320 dsa_slave_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
321 {
322 struct dsa_slave_priv *p = netdev_priv(dev);
323 int err;
324
325 err = -EOPNOTSUPP;
326 if (p->phy != NULL) {
327 err = phy_read_status(p->phy);
328 if (err == 0)
329 err = phy_ethtool_gset(p->phy, cmd);
330 }
331
332 return err;
333 }
334
335 static int
336 dsa_slave_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
337 {
338 struct dsa_slave_priv *p = netdev_priv(dev);
339
340 if (p->phy != NULL)
341 return phy_ethtool_sset(p->phy, cmd);
342
343 return -EOPNOTSUPP;
344 }
345
346 static void dsa_slave_get_drvinfo(struct net_device *dev,
347 struct ethtool_drvinfo *drvinfo)
348 {
349 strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
350 strlcpy(drvinfo->version, dsa_driver_version, sizeof(drvinfo->version));
351 strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
352 strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
353 }
354
355 static int dsa_slave_get_regs_len(struct net_device *dev)
356 {
357 struct dsa_slave_priv *p = netdev_priv(dev);
358 struct dsa_switch *ds = p->parent;
359
360 if (ds->drv->get_regs_len)
361 return ds->drv->get_regs_len(ds, p->port);
362
363 return -EOPNOTSUPP;
364 }
365
366 static void
367 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
368 {
369 struct dsa_slave_priv *p = netdev_priv(dev);
370 struct dsa_switch *ds = p->parent;
371
372 if (ds->drv->get_regs)
373 ds->drv->get_regs(ds, p->port, regs, _p);
374 }
375
376 static int dsa_slave_nway_reset(struct net_device *dev)
377 {
378 struct dsa_slave_priv *p = netdev_priv(dev);
379
380 if (p->phy != NULL)
381 return genphy_restart_aneg(p->phy);
382
383 return -EOPNOTSUPP;
384 }
385
386 static u32 dsa_slave_get_link(struct net_device *dev)
387 {
388 struct dsa_slave_priv *p = netdev_priv(dev);
389
390 if (p->phy != NULL) {
391 genphy_update_link(p->phy);
392 return p->phy->link;
393 }
394
395 return -EOPNOTSUPP;
396 }
397
398 static int dsa_slave_get_eeprom_len(struct net_device *dev)
399 {
400 struct dsa_slave_priv *p = netdev_priv(dev);
401 struct dsa_switch *ds = p->parent;
402
403 if (ds->pd->eeprom_len)
404 return ds->pd->eeprom_len;
405
406 if (ds->drv->get_eeprom_len)
407 return ds->drv->get_eeprom_len(ds);
408
409 return 0;
410 }
411
412 static int dsa_slave_get_eeprom(struct net_device *dev,
413 struct ethtool_eeprom *eeprom, u8 *data)
414 {
415 struct dsa_slave_priv *p = netdev_priv(dev);
416 struct dsa_switch *ds = p->parent;
417
418 if (ds->drv->get_eeprom)
419 return ds->drv->get_eeprom(ds, eeprom, data);
420
421 return -EOPNOTSUPP;
422 }
423
424 static int dsa_slave_set_eeprom(struct net_device *dev,
425 struct ethtool_eeprom *eeprom, u8 *data)
426 {
427 struct dsa_slave_priv *p = netdev_priv(dev);
428 struct dsa_switch *ds = p->parent;
429
430 if (ds->drv->set_eeprom)
431 return ds->drv->set_eeprom(ds, eeprom, data);
432
433 return -EOPNOTSUPP;
434 }
435
436 static void dsa_slave_get_strings(struct net_device *dev,
437 uint32_t stringset, uint8_t *data)
438 {
439 struct dsa_slave_priv *p = netdev_priv(dev);
440 struct dsa_switch *ds = p->parent;
441
442 if (stringset == ETH_SS_STATS) {
443 int len = ETH_GSTRING_LEN;
444
445 strncpy(data, "tx_packets", len);
446 strncpy(data + len, "tx_bytes", len);
447 strncpy(data + 2 * len, "rx_packets", len);
448 strncpy(data + 3 * len, "rx_bytes", len);
449 if (ds->drv->get_strings != NULL)
450 ds->drv->get_strings(ds, p->port, data + 4 * len);
451 }
452 }
453
454 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
455 struct ethtool_stats *stats,
456 uint64_t *data)
457 {
458 struct dsa_slave_priv *p = netdev_priv(dev);
459 struct dsa_switch *ds = p->parent;
460
461 data[0] = p->dev->stats.tx_packets;
462 data[1] = p->dev->stats.tx_bytes;
463 data[2] = p->dev->stats.rx_packets;
464 data[3] = p->dev->stats.rx_bytes;
465 if (ds->drv->get_ethtool_stats != NULL)
466 ds->drv->get_ethtool_stats(ds, p->port, data + 4);
467 }
468
469 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
470 {
471 struct dsa_slave_priv *p = netdev_priv(dev);
472 struct dsa_switch *ds = p->parent;
473
474 if (sset == ETH_SS_STATS) {
475 int count;
476
477 count = 4;
478 if (ds->drv->get_sset_count != NULL)
479 count += ds->drv->get_sset_count(ds);
480
481 return count;
482 }
483
484 return -EOPNOTSUPP;
485 }
486
487 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
488 {
489 struct dsa_slave_priv *p = netdev_priv(dev);
490 struct dsa_switch *ds = p->parent;
491
492 if (ds->drv->get_wol)
493 ds->drv->get_wol(ds, p->port, w);
494 }
495
496 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
497 {
498 struct dsa_slave_priv *p = netdev_priv(dev);
499 struct dsa_switch *ds = p->parent;
500 int ret = -EOPNOTSUPP;
501
502 if (ds->drv->set_wol)
503 ret = ds->drv->set_wol(ds, p->port, w);
504
505 return ret;
506 }
507
508 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
509 {
510 struct dsa_slave_priv *p = netdev_priv(dev);
511 struct dsa_switch *ds = p->parent;
512 int ret;
513
514 if (!ds->drv->set_eee)
515 return -EOPNOTSUPP;
516
517 ret = ds->drv->set_eee(ds, p->port, p->phy, e);
518 if (ret)
519 return ret;
520
521 if (p->phy)
522 ret = phy_ethtool_set_eee(p->phy, e);
523
524 return ret;
525 }
526
527 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
528 {
529 struct dsa_slave_priv *p = netdev_priv(dev);
530 struct dsa_switch *ds = p->parent;
531 int ret;
532
533 if (!ds->drv->get_eee)
534 return -EOPNOTSUPP;
535
536 ret = ds->drv->get_eee(ds, p->port, e);
537 if (ret)
538 return ret;
539
540 if (p->phy)
541 ret = phy_ethtool_get_eee(p->phy, e);
542
543 return ret;
544 }
545
546 static const struct ethtool_ops dsa_slave_ethtool_ops = {
547 .get_settings = dsa_slave_get_settings,
548 .set_settings = dsa_slave_set_settings,
549 .get_drvinfo = dsa_slave_get_drvinfo,
550 .get_regs_len = dsa_slave_get_regs_len,
551 .get_regs = dsa_slave_get_regs,
552 .nway_reset = dsa_slave_nway_reset,
553 .get_link = dsa_slave_get_link,
554 .get_eeprom_len = dsa_slave_get_eeprom_len,
555 .get_eeprom = dsa_slave_get_eeprom,
556 .set_eeprom = dsa_slave_set_eeprom,
557 .get_strings = dsa_slave_get_strings,
558 .get_ethtool_stats = dsa_slave_get_ethtool_stats,
559 .get_sset_count = dsa_slave_get_sset_count,
560 .set_wol = dsa_slave_set_wol,
561 .get_wol = dsa_slave_get_wol,
562 .set_eee = dsa_slave_set_eee,
563 .get_eee = dsa_slave_get_eee,
564 };
565
566 static const struct net_device_ops dsa_slave_netdev_ops = {
567 .ndo_init = dsa_slave_init,
568 .ndo_open = dsa_slave_open,
569 .ndo_stop = dsa_slave_close,
570 .ndo_start_xmit = dsa_slave_xmit,
571 .ndo_change_rx_flags = dsa_slave_change_rx_flags,
572 .ndo_set_rx_mode = dsa_slave_set_rx_mode,
573 .ndo_set_mac_address = dsa_slave_set_mac_address,
574 .ndo_do_ioctl = dsa_slave_ioctl,
575 .ndo_switch_parent_id_get = dsa_slave_parent_id_get,
576 .ndo_switch_port_stp_update = dsa_slave_stp_update,
577 };
578
579 static void dsa_slave_adjust_link(struct net_device *dev)
580 {
581 struct dsa_slave_priv *p = netdev_priv(dev);
582 struct dsa_switch *ds = p->parent;
583 unsigned int status_changed = 0;
584
585 if (p->old_link != p->phy->link) {
586 status_changed = 1;
587 p->old_link = p->phy->link;
588 }
589
590 if (p->old_duplex != p->phy->duplex) {
591 status_changed = 1;
592 p->old_duplex = p->phy->duplex;
593 }
594
595 if (p->old_pause != p->phy->pause) {
596 status_changed = 1;
597 p->old_pause = p->phy->pause;
598 }
599
600 if (ds->drv->adjust_link && status_changed)
601 ds->drv->adjust_link(ds, p->port, p->phy);
602
603 if (status_changed)
604 phy_print_status(p->phy);
605 }
606
607 static int dsa_slave_fixed_link_update(struct net_device *dev,
608 struct fixed_phy_status *status)
609 {
610 struct dsa_slave_priv *p = netdev_priv(dev);
611 struct dsa_switch *ds = p->parent;
612
613 if (ds->drv->fixed_link_update)
614 ds->drv->fixed_link_update(ds, p->port, status);
615
616 return 0;
617 }
618
619 /* slave device setup *******************************************************/
620 static int dsa_slave_phy_setup(struct dsa_slave_priv *p,
621 struct net_device *slave_dev)
622 {
623 struct dsa_switch *ds = p->parent;
624 struct dsa_chip_data *cd = ds->pd;
625 struct device_node *phy_dn, *port_dn;
626 bool phy_is_fixed = false;
627 u32 phy_flags = 0;
628 int mode, ret;
629
630 port_dn = cd->port_dn[p->port];
631 mode = of_get_phy_mode(port_dn);
632 if (mode < 0)
633 mode = PHY_INTERFACE_MODE_NA;
634 p->phy_interface = mode;
635
636 phy_dn = of_parse_phandle(port_dn, "phy-handle", 0);
637 if (of_phy_is_fixed_link(port_dn)) {
638 /* In the case of a fixed PHY, the DT node associated
639 * to the fixed PHY is the Port DT node
640 */
641 ret = of_phy_register_fixed_link(port_dn);
642 if (ret) {
643 netdev_err(slave_dev, "failed to register fixed PHY\n");
644 return ret;
645 }
646 phy_is_fixed = true;
647 phy_dn = port_dn;
648 }
649
650 if (ds->drv->get_phy_flags)
651 phy_flags = ds->drv->get_phy_flags(ds, p->port);
652
653 if (phy_dn)
654 p->phy = of_phy_connect(slave_dev, phy_dn,
655 dsa_slave_adjust_link, phy_flags,
656 p->phy_interface);
657
658 if (p->phy && phy_is_fixed)
659 fixed_phy_set_link_update(p->phy, dsa_slave_fixed_link_update);
660
661 /* We could not connect to a designated PHY, so use the switch internal
662 * MDIO bus instead
663 */
664 if (!p->phy) {
665 p->phy = ds->slave_mii_bus->phy_map[p->port];
666 if (!p->phy)
667 return -ENODEV;
668
669 /* Use already configured phy mode */
670 p->phy_interface = p->phy->interface;
671 phy_connect_direct(slave_dev, p->phy, dsa_slave_adjust_link,
672 p->phy_interface);
673 } else {
674 netdev_info(slave_dev, "attached PHY at address %d [%s]\n",
675 p->phy->addr, p->phy->drv->name);
676 }
677
678 return 0;
679 }
680
681 int dsa_slave_suspend(struct net_device *slave_dev)
682 {
683 struct dsa_slave_priv *p = netdev_priv(slave_dev);
684
685 netif_device_detach(slave_dev);
686
687 if (p->phy) {
688 phy_stop(p->phy);
689 p->old_pause = -1;
690 p->old_link = -1;
691 p->old_duplex = -1;
692 phy_suspend(p->phy);
693 }
694
695 return 0;
696 }
697
698 int dsa_slave_resume(struct net_device *slave_dev)
699 {
700 struct dsa_slave_priv *p = netdev_priv(slave_dev);
701
702 netif_device_attach(slave_dev);
703
704 if (p->phy) {
705 phy_resume(p->phy);
706 phy_start(p->phy);
707 }
708
709 return 0;
710 }
711
712 int dsa_slave_create(struct dsa_switch *ds, struct device *parent,
713 int port, char *name)
714 {
715 struct net_device *master = ds->dst->master_netdev;
716 struct net_device *slave_dev;
717 struct dsa_slave_priv *p;
718 int ret;
719
720 slave_dev = alloc_netdev(sizeof(struct dsa_slave_priv), name,
721 NET_NAME_UNKNOWN, ether_setup);
722 if (slave_dev == NULL)
723 return -ENOMEM;
724
725 slave_dev->features = master->vlan_features;
726 slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
727 eth_hw_addr_inherit(slave_dev, master);
728 slave_dev->tx_queue_len = 0;
729 slave_dev->netdev_ops = &dsa_slave_netdev_ops;
730
731 SET_NETDEV_DEV(slave_dev, parent);
732 slave_dev->dev.of_node = ds->pd->port_dn[port];
733 slave_dev->vlan_features = master->vlan_features;
734
735 p = netdev_priv(slave_dev);
736 p->dev = slave_dev;
737 p->parent = ds;
738 p->port = port;
739
740 switch (ds->dst->tag_protocol) {
741 #ifdef CONFIG_NET_DSA_TAG_DSA
742 case DSA_TAG_PROTO_DSA:
743 p->xmit = dsa_netdev_ops.xmit;
744 break;
745 #endif
746 #ifdef CONFIG_NET_DSA_TAG_EDSA
747 case DSA_TAG_PROTO_EDSA:
748 p->xmit = edsa_netdev_ops.xmit;
749 break;
750 #endif
751 #ifdef CONFIG_NET_DSA_TAG_TRAILER
752 case DSA_TAG_PROTO_TRAILER:
753 p->xmit = trailer_netdev_ops.xmit;
754 break;
755 #endif
756 #ifdef CONFIG_NET_DSA_TAG_BRCM
757 case DSA_TAG_PROTO_BRCM:
758 p->xmit = brcm_netdev_ops.xmit;
759 break;
760 #endif
761 default:
762 p->xmit = dsa_slave_notag_xmit;
763 break;
764 }
765
766 p->old_pause = -1;
767 p->old_link = -1;
768 p->old_duplex = -1;
769
770 ret = dsa_slave_phy_setup(p, slave_dev);
771 if (ret) {
772 free_netdev(slave_dev);
773 return ret;
774 }
775
776 ds->ports[port] = slave_dev;
777 ret = register_netdev(slave_dev);
778 if (ret) {
779 netdev_err(master, "error %d registering interface %s\n",
780 ret, slave_dev->name);
781 phy_disconnect(p->phy);
782 ds->ports[port] = NULL;
783 free_netdev(slave_dev);
784 return ret;
785 }
786
787 netif_carrier_off(slave_dev);
788
789 return 0;
790 }
791
792 static bool dsa_slave_dev_check(struct net_device *dev)
793 {
794 return dev->netdev_ops == &dsa_slave_netdev_ops;
795 }
796
797 static int dsa_slave_master_changed(struct net_device *dev)
798 {
799 struct net_device *master = netdev_master_upper_dev_get(dev);
800 int err = 0;
801
802 if (master && master->rtnl_link_ops &&
803 !strcmp(master->rtnl_link_ops->kind, "bridge"))
804 err = dsa_slave_bridge_port_join(dev, master);
805 else
806 err = dsa_slave_bridge_port_leave(dev);
807
808 return err;
809 }
810
811 int dsa_slave_netdevice_event(struct notifier_block *unused,
812 unsigned long event, void *ptr)
813 {
814 struct net_device *dev;
815 int err = 0;
816
817 switch (event) {
818 case NETDEV_CHANGEUPPER:
819 dev = netdev_notifier_info_to_dev(ptr);
820 if (!dsa_slave_dev_check(dev))
821 goto out;
822
823 err = dsa_slave_master_changed(dev);
824 if (err)
825 netdev_warn(dev, "failed to reflect master change\n");
826
827 break;
828 }
829
830 out:
831 return NOTIFY_DONE;
832 }
Linux kernel - Deliverables
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