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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}