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v5.14.15
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Handling of a master device, switching frames via its switch fabric CPU port
  4 *
  5 * Copyright (c) 2017 Savoir-faire Linux Inc.
  6 *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
  7 */
  8
  9#include "dsa_priv.h"
 
 
 
 
 
 
 
 
 10
 11static int dsa_master_get_regs_len(struct net_device *dev)
 12{
 13	struct dsa_port *cpu_dp = dev->dsa_ptr;
 14	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
 15	struct dsa_switch *ds = cpu_dp->ds;
 16	int port = cpu_dp->index;
 17	int ret = 0;
 18	int len;
 19
 20	if (ops->get_regs_len) {
 21		len = ops->get_regs_len(dev);
 22		if (len < 0)
 23			return len;
 24		ret += len;
 25	}
 26
 27	ret += sizeof(struct ethtool_drvinfo);
 28	ret += sizeof(struct ethtool_regs);
 29
 30	if (ds->ops->get_regs_len) {
 31		len = ds->ops->get_regs_len(ds, port);
 32		if (len < 0)
 33			return len;
 34		ret += len;
 35	}
 36
 37	return ret;
 38}
 39
 40static void dsa_master_get_regs(struct net_device *dev,
 41				struct ethtool_regs *regs, void *data)
 42{
 43	struct dsa_port *cpu_dp = dev->dsa_ptr;
 44	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
 45	struct dsa_switch *ds = cpu_dp->ds;
 46	struct ethtool_drvinfo *cpu_info;
 47	struct ethtool_regs *cpu_regs;
 48	int port = cpu_dp->index;
 49	int len;
 50
 51	if (ops->get_regs_len && ops->get_regs) {
 52		len = ops->get_regs_len(dev);
 53		if (len < 0)
 54			return;
 55		regs->len = len;
 56		ops->get_regs(dev, regs, data);
 57		data += regs->len;
 58	}
 59
 60	cpu_info = (struct ethtool_drvinfo *)data;
 61	strlcpy(cpu_info->driver, "dsa", sizeof(cpu_info->driver));
 62	data += sizeof(*cpu_info);
 63	cpu_regs = (struct ethtool_regs *)data;
 64	data += sizeof(*cpu_regs);
 65
 66	if (ds->ops->get_regs_len && ds->ops->get_regs) {
 67		len = ds->ops->get_regs_len(ds, port);
 68		if (len < 0)
 69			return;
 70		cpu_regs->len = len;
 71		ds->ops->get_regs(ds, port, cpu_regs, data);
 72	}
 73}
 74
 75static void dsa_master_get_ethtool_stats(struct net_device *dev,
 76					 struct ethtool_stats *stats,
 77					 uint64_t *data)
 78{
 79	struct dsa_port *cpu_dp = dev->dsa_ptr;
 80	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
 81	struct dsa_switch *ds = cpu_dp->ds;
 82	int port = cpu_dp->index;
 83	int count = 0;
 84
 85	if (ops->get_sset_count && ops->get_ethtool_stats) {
 86		count = ops->get_sset_count(dev, ETH_SS_STATS);
 87		ops->get_ethtool_stats(dev, stats, data);
 88	}
 89
 90	if (ds->ops->get_ethtool_stats)
 91		ds->ops->get_ethtool_stats(ds, port, data + count);
 92}
 93
 94static void dsa_master_get_ethtool_phy_stats(struct net_device *dev,
 95					     struct ethtool_stats *stats,
 96					     uint64_t *data)
 97{
 98	struct dsa_port *cpu_dp = dev->dsa_ptr;
 99	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
100	struct dsa_switch *ds = cpu_dp->ds;
101	int port = cpu_dp->index;
102	int count = 0;
103
104	if (dev->phydev && !ops->get_ethtool_phy_stats) {
105		count = phy_ethtool_get_sset_count(dev->phydev);
106		if (count >= 0)
107			phy_ethtool_get_stats(dev->phydev, stats, data);
108	} else if (ops->get_sset_count && ops->get_ethtool_phy_stats) {
109		count = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
110		ops->get_ethtool_phy_stats(dev, stats, data);
111	}
112
113	if (count < 0)
114		count = 0;
115
116	if (ds->ops->get_ethtool_phy_stats)
117		ds->ops->get_ethtool_phy_stats(ds, port, data + count);
118}
119
120static int dsa_master_get_sset_count(struct net_device *dev, int sset)
121{
122	struct dsa_port *cpu_dp = dev->dsa_ptr;
123	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
124	struct dsa_switch *ds = cpu_dp->ds;
125	int count = 0;
126
127	if (sset == ETH_SS_PHY_STATS && dev->phydev &&
128	    !ops->get_ethtool_phy_stats)
129		count = phy_ethtool_get_sset_count(dev->phydev);
130	else if (ops->get_sset_count)
131		count = ops->get_sset_count(dev, sset);
132
133	if (count < 0)
134		count = 0;
135
136	if (ds->ops->get_sset_count)
137		count += ds->ops->get_sset_count(ds, cpu_dp->index, sset);
138
139	return count;
140}
141
142static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
143				   uint8_t *data)
144{
145	struct dsa_port *cpu_dp = dev->dsa_ptr;
146	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
147	struct dsa_switch *ds = cpu_dp->ds;
148	int port = cpu_dp->index;
149	int len = ETH_GSTRING_LEN;
150	int mcount = 0, count, i;
151	uint8_t pfx[4];
152	uint8_t *ndata;
153
154	snprintf(pfx, sizeof(pfx), "p%.2d", port);
155	/* We do not want to be NULL-terminated, since this is a prefix */
156	pfx[sizeof(pfx) - 1] = '_';
157
158	if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
159	    !ops->get_ethtool_phy_stats) {
160		mcount = phy_ethtool_get_sset_count(dev->phydev);
161		if (mcount < 0)
162			mcount = 0;
163		else
164			phy_ethtool_get_strings(dev->phydev, data);
165	} else if (ops->get_sset_count && ops->get_strings) {
166		mcount = ops->get_sset_count(dev, stringset);
167		if (mcount < 0)
168			mcount = 0;
169		ops->get_strings(dev, stringset, data);
170	}
171
172	if (ds->ops->get_strings) {
173		ndata = data + mcount * len;
174		/* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
175		 * the output after to prepend our CPU port prefix we
176		 * constructed earlier
177		 */
178		ds->ops->get_strings(ds, port, stringset, ndata);
179		count = ds->ops->get_sset_count(ds, port, stringset);
180		if (count < 0)
181			return;
182		for (i = 0; i < count; i++) {
183			memmove(ndata + (i * len + sizeof(pfx)),
184				ndata + i * len, len - sizeof(pfx));
185			memcpy(ndata + i * len, pfx, sizeof(pfx));
186		}
187	}
188}
189
190static int dsa_master_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
191{
192	struct dsa_port *cpu_dp = dev->dsa_ptr;
193	struct dsa_switch *ds = cpu_dp->ds;
194	struct dsa_switch_tree *dst;
195	int err = -EOPNOTSUPP;
196	struct dsa_port *dp;
197
198	dst = ds->dst;
199
200	switch (cmd) {
201	case SIOCGHWTSTAMP:
202	case SIOCSHWTSTAMP:
203		/* Deny PTP operations on master if there is at least one
204		 * switch in the tree that is PTP capable.
205		 */
206		list_for_each_entry(dp, &dst->ports, list)
207			if (dp->ds->ops->port_hwtstamp_get ||
208			    dp->ds->ops->port_hwtstamp_set)
209				return -EBUSY;
210		break;
211	}
212
213	if (dev->netdev_ops->ndo_do_ioctl)
214		err = dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
215
216	return err;
217}
218
219static const struct dsa_netdevice_ops dsa_netdev_ops = {
220	.ndo_do_ioctl = dsa_master_ioctl,
221};
222
223static int dsa_master_ethtool_setup(struct net_device *dev)
224{
225	struct dsa_port *cpu_dp = dev->dsa_ptr;
226	struct dsa_switch *ds = cpu_dp->ds;
227	struct ethtool_ops *ops;
228
 
 
 
229	ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
230	if (!ops)
231		return -ENOMEM;
232
233	cpu_dp->orig_ethtool_ops = dev->ethtool_ops;
234	if (cpu_dp->orig_ethtool_ops)
235		memcpy(ops, cpu_dp->orig_ethtool_ops, sizeof(*ops));
236
237	ops->get_regs_len = dsa_master_get_regs_len;
238	ops->get_regs = dsa_master_get_regs;
239	ops->get_sset_count = dsa_master_get_sset_count;
240	ops->get_ethtool_stats = dsa_master_get_ethtool_stats;
241	ops->get_strings = dsa_master_get_strings;
242	ops->get_ethtool_phy_stats = dsa_master_get_ethtool_phy_stats;
243
244	dev->ethtool_ops = ops;
245
246	return 0;
247}
248
249static void dsa_master_ethtool_teardown(struct net_device *dev)
250{
251	struct dsa_port *cpu_dp = dev->dsa_ptr;
252
 
 
 
253	dev->ethtool_ops = cpu_dp->orig_ethtool_ops;
254	cpu_dp->orig_ethtool_ops = NULL;
255}
256
257static void dsa_netdev_ops_set(struct net_device *dev,
258			       const struct dsa_netdevice_ops *ops)
259{
 
 
 
260	dev->dsa_ptr->netdev_ops = ops;
261}
262
 
 
 
 
 
263static void dsa_master_set_promiscuity(struct net_device *dev, int inc)
264{
265	const struct dsa_device_ops *ops = dev->dsa_ptr->tag_ops;
266
267	if (!ops->promisc_on_master)
268		return;
269
270	rtnl_lock();
 
271	dev_set_promiscuity(dev, inc);
272	rtnl_unlock();
273}
274
275static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
276			    char *buf)
277{
278	struct net_device *dev = to_net_dev(d);
279	struct dsa_port *cpu_dp = dev->dsa_ptr;
280
281	return sprintf(buf, "%s\n",
282		       dsa_tag_protocol_to_str(cpu_dp->tag_ops));
283}
284
285static ssize_t tagging_store(struct device *d, struct device_attribute *attr,
286			     const char *buf, size_t count)
287{
288	const struct dsa_device_ops *new_tag_ops, *old_tag_ops;
 
289	struct net_device *dev = to_net_dev(d);
290	struct dsa_port *cpu_dp = dev->dsa_ptr;
 
291	int err;
292
 
 
 
 
 
 
 
 
293	old_tag_ops = cpu_dp->tag_ops;
294	new_tag_ops = dsa_find_tagger_by_name(buf);
295	/* Bad tagger name, or module is not loaded? */
 
296	if (IS_ERR(new_tag_ops))
297		return PTR_ERR(new_tag_ops);
298
299	if (new_tag_ops == old_tag_ops)
300		/* Drop the temporarily held duplicate reference, since
301		 * the DSA switch tree uses this tagger.
302		 */
303		goto out;
304
305	err = dsa_tree_change_tag_proto(cpu_dp->ds->dst, dev, new_tag_ops,
306					old_tag_ops);
307	if (err) {
308		/* On failure the old tagger is restored, so we don't need the
309		 * driver for the new one.
310		 */
311		dsa_tag_driver_put(new_tag_ops);
312		return err;
313	}
314
315	/* On success we no longer need the module for the old tagging protocol
316	 */
317out:
318	dsa_tag_driver_put(old_tag_ops);
319	return count;
320}
321static DEVICE_ATTR_RW(tagging);
322
323static struct attribute *dsa_slave_attrs[] = {
324	&dev_attr_tagging.attr,
325	NULL
326};
327
328static const struct attribute_group dsa_group = {
329	.name	= "dsa",
330	.attrs	= dsa_slave_attrs,
331};
332
333static void dsa_master_reset_mtu(struct net_device *dev)
334{
335	int err;
336
337	rtnl_lock();
338	err = dev_set_mtu(dev, ETH_DATA_LEN);
339	if (err)
340		netdev_dbg(dev,
341			   "Unable to reset MTU to exclude DSA overheads\n");
342	rtnl_unlock();
343}
344
345static struct lock_class_key dsa_master_addr_list_lock_key;
346
347int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
348{
349	const struct dsa_device_ops *tag_ops = cpu_dp->tag_ops;
350	struct dsa_switch *ds = cpu_dp->ds;
351	struct device_link *consumer_link;
352	int mtu, ret;
353
354	mtu = ETH_DATA_LEN + dsa_tag_protocol_overhead(tag_ops);
355
356	/* The DSA master must use SET_NETDEV_DEV for this to work. */
357	consumer_link = device_link_add(ds->dev, dev->dev.parent,
358					DL_FLAG_AUTOREMOVE_CONSUMER);
359	if (!consumer_link)
360		netdev_err(dev,
361			   "Failed to create a device link to DSA switch %s\n",
362			   dev_name(ds->dev));
 
 
363
364	rtnl_lock();
 
 
 
365	ret = dev_set_mtu(dev, mtu);
366	rtnl_unlock();
367	if (ret)
368		netdev_warn(dev, "error %d setting MTU to %d to include DSA overhead\n",
369			    ret, mtu);
370
371	/* If we use a tagging format that doesn't have an ethertype
372	 * field, make sure that all packets from this point on get
373	 * sent to the tag format's receive function.
374	 */
375	wmb();
376
377	dev->dsa_ptr = cpu_dp;
378	lockdep_set_class(&dev->addr_list_lock,
379			  &dsa_master_addr_list_lock_key);
380
381	dsa_master_set_promiscuity(dev, 1);
382
383	ret = dsa_master_ethtool_setup(dev);
384	if (ret)
385		goto out_err_reset_promisc;
386
387	dsa_netdev_ops_set(dev, &dsa_netdev_ops);
388
389	ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
390	if (ret)
391		goto out_err_ndo_teardown;
392
393	return ret;
394
395out_err_ndo_teardown:
396	dsa_netdev_ops_set(dev, NULL);
397	dsa_master_ethtool_teardown(dev);
398out_err_reset_promisc:
399	dsa_master_set_promiscuity(dev, -1);
400	return ret;
401}
402
403void dsa_master_teardown(struct net_device *dev)
404{
405	sysfs_remove_group(&dev->dev.kobj, &dsa_group);
406	dsa_netdev_ops_set(dev, NULL);
407	dsa_master_ethtool_teardown(dev);
408	dsa_master_reset_mtu(dev);
409	dsa_master_set_promiscuity(dev, -1);
410
411	dev->dsa_ptr = NULL;
412
413	/* If we used a tagging format that doesn't have an ethertype
414	 * field, make sure that all packets from this point get sent
415	 * without the tag and go through the regular receive path.
416	 */
417	wmb();
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
418}
v6.2
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Handling of a master device, switching frames via its switch fabric CPU port
  4 *
  5 * Copyright (c) 2017 Savoir-faire Linux Inc.
  6 *	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
  7 */
  8
  9#include <linux/ethtool.h>
 10#include <linux/netdevice.h>
 11#include <linux/netlink.h>
 12#include <net/dsa.h>
 13
 14#include "dsa.h"
 15#include "master.h"
 16#include "port.h"
 17#include "tag.h"
 18
 19static int dsa_master_get_regs_len(struct net_device *dev)
 20{
 21	struct dsa_port *cpu_dp = dev->dsa_ptr;
 22	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
 23	struct dsa_switch *ds = cpu_dp->ds;
 24	int port = cpu_dp->index;
 25	int ret = 0;
 26	int len;
 27
 28	if (ops->get_regs_len) {
 29		len = ops->get_regs_len(dev);
 30		if (len < 0)
 31			return len;
 32		ret += len;
 33	}
 34
 35	ret += sizeof(struct ethtool_drvinfo);
 36	ret += sizeof(struct ethtool_regs);
 37
 38	if (ds->ops->get_regs_len) {
 39		len = ds->ops->get_regs_len(ds, port);
 40		if (len < 0)
 41			return len;
 42		ret += len;
 43	}
 44
 45	return ret;
 46}
 47
 48static void dsa_master_get_regs(struct net_device *dev,
 49				struct ethtool_regs *regs, void *data)
 50{
 51	struct dsa_port *cpu_dp = dev->dsa_ptr;
 52	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
 53	struct dsa_switch *ds = cpu_dp->ds;
 54	struct ethtool_drvinfo *cpu_info;
 55	struct ethtool_regs *cpu_regs;
 56	int port = cpu_dp->index;
 57	int len;
 58
 59	if (ops->get_regs_len && ops->get_regs) {
 60		len = ops->get_regs_len(dev);
 61		if (len < 0)
 62			return;
 63		regs->len = len;
 64		ops->get_regs(dev, regs, data);
 65		data += regs->len;
 66	}
 67
 68	cpu_info = (struct ethtool_drvinfo *)data;
 69	strscpy(cpu_info->driver, "dsa", sizeof(cpu_info->driver));
 70	data += sizeof(*cpu_info);
 71	cpu_regs = (struct ethtool_regs *)data;
 72	data += sizeof(*cpu_regs);
 73
 74	if (ds->ops->get_regs_len && ds->ops->get_regs) {
 75		len = ds->ops->get_regs_len(ds, port);
 76		if (len < 0)
 77			return;
 78		cpu_regs->len = len;
 79		ds->ops->get_regs(ds, port, cpu_regs, data);
 80	}
 81}
 82
 83static void dsa_master_get_ethtool_stats(struct net_device *dev,
 84					 struct ethtool_stats *stats,
 85					 uint64_t *data)
 86{
 87	struct dsa_port *cpu_dp = dev->dsa_ptr;
 88	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
 89	struct dsa_switch *ds = cpu_dp->ds;
 90	int port = cpu_dp->index;
 91	int count = 0;
 92
 93	if (ops->get_sset_count && ops->get_ethtool_stats) {
 94		count = ops->get_sset_count(dev, ETH_SS_STATS);
 95		ops->get_ethtool_stats(dev, stats, data);
 96	}
 97
 98	if (ds->ops->get_ethtool_stats)
 99		ds->ops->get_ethtool_stats(ds, port, data + count);
100}
101
102static void dsa_master_get_ethtool_phy_stats(struct net_device *dev,
103					     struct ethtool_stats *stats,
104					     uint64_t *data)
105{
106	struct dsa_port *cpu_dp = dev->dsa_ptr;
107	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
108	struct dsa_switch *ds = cpu_dp->ds;
109	int port = cpu_dp->index;
110	int count = 0;
111
112	if (dev->phydev && !ops->get_ethtool_phy_stats) {
113		count = phy_ethtool_get_sset_count(dev->phydev);
114		if (count >= 0)
115			phy_ethtool_get_stats(dev->phydev, stats, data);
116	} else if (ops->get_sset_count && ops->get_ethtool_phy_stats) {
117		count = ops->get_sset_count(dev, ETH_SS_PHY_STATS);
118		ops->get_ethtool_phy_stats(dev, stats, data);
119	}
120
121	if (count < 0)
122		count = 0;
123
124	if (ds->ops->get_ethtool_phy_stats)
125		ds->ops->get_ethtool_phy_stats(ds, port, data + count);
126}
127
128static int dsa_master_get_sset_count(struct net_device *dev, int sset)
129{
130	struct dsa_port *cpu_dp = dev->dsa_ptr;
131	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
132	struct dsa_switch *ds = cpu_dp->ds;
133	int count = 0;
134
135	if (sset == ETH_SS_PHY_STATS && dev->phydev &&
136	    !ops->get_ethtool_phy_stats)
137		count = phy_ethtool_get_sset_count(dev->phydev);
138	else if (ops->get_sset_count)
139		count = ops->get_sset_count(dev, sset);
140
141	if (count < 0)
142		count = 0;
143
144	if (ds->ops->get_sset_count)
145		count += ds->ops->get_sset_count(ds, cpu_dp->index, sset);
146
147	return count;
148}
149
150static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
151				   uint8_t *data)
152{
153	struct dsa_port *cpu_dp = dev->dsa_ptr;
154	const struct ethtool_ops *ops = cpu_dp->orig_ethtool_ops;
155	struct dsa_switch *ds = cpu_dp->ds;
156	int port = cpu_dp->index;
157	int len = ETH_GSTRING_LEN;
158	int mcount = 0, count, i;
159	uint8_t pfx[4];
160	uint8_t *ndata;
161
162	snprintf(pfx, sizeof(pfx), "p%.2d", port);
163	/* We do not want to be NULL-terminated, since this is a prefix */
164	pfx[sizeof(pfx) - 1] = '_';
165
166	if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
167	    !ops->get_ethtool_phy_stats) {
168		mcount = phy_ethtool_get_sset_count(dev->phydev);
169		if (mcount < 0)
170			mcount = 0;
171		else
172			phy_ethtool_get_strings(dev->phydev, data);
173	} else if (ops->get_sset_count && ops->get_strings) {
174		mcount = ops->get_sset_count(dev, stringset);
175		if (mcount < 0)
176			mcount = 0;
177		ops->get_strings(dev, stringset, data);
178	}
179
180	if (ds->ops->get_strings) {
181		ndata = data + mcount * len;
182		/* This function copies ETH_GSTRINGS_LEN bytes, we will mangle
183		 * the output after to prepend our CPU port prefix we
184		 * constructed earlier
185		 */
186		ds->ops->get_strings(ds, port, stringset, ndata);
187		count = ds->ops->get_sset_count(ds, port, stringset);
188		if (count < 0)
189			return;
190		for (i = 0; i < count; i++) {
191			memmove(ndata + (i * len + sizeof(pfx)),
192				ndata + i * len, len - sizeof(pfx));
193			memcpy(ndata + i * len, pfx, sizeof(pfx));
194		}
195	}
196}
197
198static int dsa_master_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
199{
200	struct dsa_port *cpu_dp = dev->dsa_ptr;
201	struct dsa_switch *ds = cpu_dp->ds;
202	struct dsa_switch_tree *dst;
203	int err = -EOPNOTSUPP;
204	struct dsa_port *dp;
205
206	dst = ds->dst;
207
208	switch (cmd) {
209	case SIOCGHWTSTAMP:
210	case SIOCSHWTSTAMP:
211		/* Deny PTP operations on master if there is at least one
212		 * switch in the tree that is PTP capable.
213		 */
214		list_for_each_entry(dp, &dst->ports, list)
215			if (dsa_port_supports_hwtstamp(dp, ifr))
 
216				return -EBUSY;
217		break;
218	}
219
220	if (dev->netdev_ops->ndo_eth_ioctl)
221		err = dev->netdev_ops->ndo_eth_ioctl(dev, ifr, cmd);
222
223	return err;
224}
225
226static const struct dsa_netdevice_ops dsa_netdev_ops = {
227	.ndo_eth_ioctl = dsa_master_ioctl,
228};
229
230static int dsa_master_ethtool_setup(struct net_device *dev)
231{
232	struct dsa_port *cpu_dp = dev->dsa_ptr;
233	struct dsa_switch *ds = cpu_dp->ds;
234	struct ethtool_ops *ops;
235
236	if (netif_is_lag_master(dev))
237		return 0;
238
239	ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
240	if (!ops)
241		return -ENOMEM;
242
243	cpu_dp->orig_ethtool_ops = dev->ethtool_ops;
244	if (cpu_dp->orig_ethtool_ops)
245		memcpy(ops, cpu_dp->orig_ethtool_ops, sizeof(*ops));
246
247	ops->get_regs_len = dsa_master_get_regs_len;
248	ops->get_regs = dsa_master_get_regs;
249	ops->get_sset_count = dsa_master_get_sset_count;
250	ops->get_ethtool_stats = dsa_master_get_ethtool_stats;
251	ops->get_strings = dsa_master_get_strings;
252	ops->get_ethtool_phy_stats = dsa_master_get_ethtool_phy_stats;
253
254	dev->ethtool_ops = ops;
255
256	return 0;
257}
258
259static void dsa_master_ethtool_teardown(struct net_device *dev)
260{
261	struct dsa_port *cpu_dp = dev->dsa_ptr;
262
263	if (netif_is_lag_master(dev))
264		return;
265
266	dev->ethtool_ops = cpu_dp->orig_ethtool_ops;
267	cpu_dp->orig_ethtool_ops = NULL;
268}
269
270static void dsa_netdev_ops_set(struct net_device *dev,
271			       const struct dsa_netdevice_ops *ops)
272{
273	if (netif_is_lag_master(dev))
274		return;
275
276	dev->dsa_ptr->netdev_ops = ops;
277}
278
279/* Keep the master always promiscuous if the tagging protocol requires that
280 * (garbles MAC DA) or if it doesn't support unicast filtering, case in which
281 * it would revert to promiscuous mode as soon as we call dev_uc_add() on it
282 * anyway.
283 */
284static void dsa_master_set_promiscuity(struct net_device *dev, int inc)
285{
286	const struct dsa_device_ops *ops = dev->dsa_ptr->tag_ops;
287
288	if ((dev->priv_flags & IFF_UNICAST_FLT) && !ops->promisc_on_master)
289		return;
290
291	ASSERT_RTNL();
292
293	dev_set_promiscuity(dev, inc);
 
294}
295
296static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
297			    char *buf)
298{
299	struct net_device *dev = to_net_dev(d);
300	struct dsa_port *cpu_dp = dev->dsa_ptr;
301
302	return sprintf(buf, "%s\n",
303		       dsa_tag_protocol_to_str(cpu_dp->tag_ops));
304}
305
306static ssize_t tagging_store(struct device *d, struct device_attribute *attr,
307			     const char *buf, size_t count)
308{
309	const struct dsa_device_ops *new_tag_ops, *old_tag_ops;
310	const char *end = strchrnul(buf, '\n'), *name;
311	struct net_device *dev = to_net_dev(d);
312	struct dsa_port *cpu_dp = dev->dsa_ptr;
313	size_t len = end - buf;
314	int err;
315
316	/* Empty string passed */
317	if (!len)
318		return -ENOPROTOOPT;
319
320	name = kstrndup(buf, len, GFP_KERNEL);
321	if (!name)
322		return -ENOMEM;
323
324	old_tag_ops = cpu_dp->tag_ops;
325	new_tag_ops = dsa_tag_driver_get_by_name(name);
326	kfree(name);
327	/* Bad tagger name? */
328	if (IS_ERR(new_tag_ops))
329		return PTR_ERR(new_tag_ops);
330
331	if (new_tag_ops == old_tag_ops)
332		/* Drop the temporarily held duplicate reference, since
333		 * the DSA switch tree uses this tagger.
334		 */
335		goto out;
336
337	err = dsa_tree_change_tag_proto(cpu_dp->ds->dst, new_tag_ops,
338					old_tag_ops);
339	if (err) {
340		/* On failure the old tagger is restored, so we don't need the
341		 * driver for the new one.
342		 */
343		dsa_tag_driver_put(new_tag_ops);
344		return err;
345	}
346
347	/* On success we no longer need the module for the old tagging protocol
348	 */
349out:
350	dsa_tag_driver_put(old_tag_ops);
351	return count;
352}
353static DEVICE_ATTR_RW(tagging);
354
355static struct attribute *dsa_slave_attrs[] = {
356	&dev_attr_tagging.attr,
357	NULL
358};
359
360static const struct attribute_group dsa_group = {
361	.name	= "dsa",
362	.attrs	= dsa_slave_attrs,
363};
364
365static void dsa_master_reset_mtu(struct net_device *dev)
366{
367	int err;
368
 
369	err = dev_set_mtu(dev, ETH_DATA_LEN);
370	if (err)
371		netdev_dbg(dev,
372			   "Unable to reset MTU to exclude DSA overheads\n");
 
373}
374
 
 
375int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
376{
377	const struct dsa_device_ops *tag_ops = cpu_dp->tag_ops;
378	struct dsa_switch *ds = cpu_dp->ds;
379	struct device_link *consumer_link;
380	int mtu, ret;
381
382	mtu = ETH_DATA_LEN + dsa_tag_protocol_overhead(tag_ops);
383
384	/* The DSA master must use SET_NETDEV_DEV for this to work. */
385	if (!netif_is_lag_master(dev)) {
386		consumer_link = device_link_add(ds->dev, dev->dev.parent,
387						DL_FLAG_AUTOREMOVE_CONSUMER);
388		if (!consumer_link)
389			netdev_err(dev,
390				   "Failed to create a device link to DSA switch %s\n",
391				   dev_name(ds->dev));
392	}
393
394	/* The switch driver may not implement ->port_change_mtu(), case in
395	 * which dsa_slave_change_mtu() will not update the master MTU either,
396	 * so we need to do that here.
397	 */
398	ret = dev_set_mtu(dev, mtu);
 
399	if (ret)
400		netdev_warn(dev, "error %d setting MTU to %d to include DSA overhead\n",
401			    ret, mtu);
402
403	/* If we use a tagging format that doesn't have an ethertype
404	 * field, make sure that all packets from this point on get
405	 * sent to the tag format's receive function.
406	 */
407	wmb();
408
409	dev->dsa_ptr = cpu_dp;
 
 
410
411	dsa_master_set_promiscuity(dev, 1);
412
413	ret = dsa_master_ethtool_setup(dev);
414	if (ret)
415		goto out_err_reset_promisc;
416
417	dsa_netdev_ops_set(dev, &dsa_netdev_ops);
418
419	ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
420	if (ret)
421		goto out_err_ndo_teardown;
422
423	return ret;
424
425out_err_ndo_teardown:
426	dsa_netdev_ops_set(dev, NULL);
427	dsa_master_ethtool_teardown(dev);
428out_err_reset_promisc:
429	dsa_master_set_promiscuity(dev, -1);
430	return ret;
431}
432
433void dsa_master_teardown(struct net_device *dev)
434{
435	sysfs_remove_group(&dev->dev.kobj, &dsa_group);
436	dsa_netdev_ops_set(dev, NULL);
437	dsa_master_ethtool_teardown(dev);
438	dsa_master_reset_mtu(dev);
439	dsa_master_set_promiscuity(dev, -1);
440
441	dev->dsa_ptr = NULL;
442
443	/* If we used a tagging format that doesn't have an ethertype
444	 * field, make sure that all packets from this point get sent
445	 * without the tag and go through the regular receive path.
446	 */
447	wmb();
448}
449
450int dsa_master_lag_setup(struct net_device *lag_dev, struct dsa_port *cpu_dp,
451			 struct netdev_lag_upper_info *uinfo,
452			 struct netlink_ext_ack *extack)
453{
454	bool master_setup = false;
455	int err;
456
457	if (!netdev_uses_dsa(lag_dev)) {
458		err = dsa_master_setup(lag_dev, cpu_dp);
459		if (err)
460			return err;
461
462		master_setup = true;
463	}
464
465	err = dsa_port_lag_join(cpu_dp, lag_dev, uinfo, extack);
466	if (err) {
467		if (extack && !extack->_msg)
468			NL_SET_ERR_MSG_MOD(extack,
469					   "CPU port failed to join LAG");
470		goto out_master_teardown;
471	}
472
473	return 0;
474
475out_master_teardown:
476	if (master_setup)
477		dsa_master_teardown(lag_dev);
478	return err;
479}
480
481/* Tear down a master if there isn't any other user port on it,
482 * optionally also destroying LAG information.
483 */
484void dsa_master_lag_teardown(struct net_device *lag_dev,
485			     struct dsa_port *cpu_dp)
486{
487	struct net_device *upper;
488	struct list_head *iter;
489
490	dsa_port_lag_leave(cpu_dp, lag_dev);
491
492	netdev_for_each_upper_dev_rcu(lag_dev, upper, iter)
493		if (dsa_slave_dev_check(upper))
494			return;
495
496	dsa_master_teardown(lag_dev);
497}