1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Handling of a master device, switching frames via its switch fabric CPU port
5 * Copyright (c) 2017 Savoir-faire Linux Inc.
6 * Vivien Didelot <vivien.didelot@savoirfairelinux.com>
11 static int dsa_master_get_regs_len(struct net_device *dev)
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;
20 if (ops->get_regs_len) {
21 len = ops->get_regs_len(dev);
27 ret += sizeof(struct ethtool_drvinfo);
28 ret += sizeof(struct ethtool_regs);
30 if (ds->ops->get_regs_len) {
31 len = ds->ops->get_regs_len(ds, port);
40 static void dsa_master_get_regs(struct net_device *dev,
41 struct ethtool_regs *regs, void *data)
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;
51 if (ops->get_regs_len && ops->get_regs) {
52 len = ops->get_regs_len(dev);
56 ops->get_regs(dev, regs, data);
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);
66 if (ds->ops->get_regs_len && ds->ops->get_regs) {
67 len = ds->ops->get_regs_len(ds, port);
71 ds->ops->get_regs(ds, port, cpu_regs, data);
75 static void dsa_master_get_ethtool_stats(struct net_device *dev,
76 struct ethtool_stats *stats,
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;
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);
90 if (ds->ops->get_ethtool_stats)
91 ds->ops->get_ethtool_stats(ds, port, data + count);
94 static void dsa_master_get_ethtool_phy_stats(struct net_device *dev,
95 struct ethtool_stats *stats,
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;
104 if (dev->phydev && !ops->get_ethtool_phy_stats) {
105 count = phy_ethtool_get_sset_count(dev->phydev);
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);
116 if (ds->ops->get_ethtool_phy_stats)
117 ds->ops->get_ethtool_phy_stats(ds, port, data + count);
120 static int dsa_master_get_sset_count(struct net_device *dev, int sset)
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;
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);
136 if (ds->ops->get_sset_count)
137 count += ds->ops->get_sset_count(ds, cpu_dp->index, sset);
142 static void dsa_master_get_strings(struct net_device *dev, uint32_t stringset,
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;
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] = '_';
158 if (stringset == ETH_SS_PHY_STATS && dev->phydev &&
159 !ops->get_ethtool_phy_stats) {
160 mcount = phy_ethtool_get_sset_count(dev->phydev);
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);
169 ops->get_strings(dev, stringset, data);
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
178 ds->ops->get_strings(ds, port, stringset, ndata);
179 count = ds->ops->get_sset_count(ds, port, stringset);
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));
190 static int dsa_master_get_phys_port_name(struct net_device *dev,
191 char *name, size_t len)
193 struct dsa_port *cpu_dp = dev->dsa_ptr;
195 if (snprintf(name, len, "p%d", cpu_dp->index) >= len)
201 static int dsa_master_ethtool_setup(struct net_device *dev)
203 struct dsa_port *cpu_dp = dev->dsa_ptr;
204 struct dsa_switch *ds = cpu_dp->ds;
205 struct ethtool_ops *ops;
207 ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
211 cpu_dp->orig_ethtool_ops = dev->ethtool_ops;
212 if (cpu_dp->orig_ethtool_ops)
213 memcpy(ops, cpu_dp->orig_ethtool_ops, sizeof(*ops));
215 ops->get_regs_len = dsa_master_get_regs_len;
216 ops->get_regs = dsa_master_get_regs;
217 ops->get_sset_count = dsa_master_get_sset_count;
218 ops->get_ethtool_stats = dsa_master_get_ethtool_stats;
219 ops->get_strings = dsa_master_get_strings;
220 ops->get_ethtool_phy_stats = dsa_master_get_ethtool_phy_stats;
222 dev->ethtool_ops = ops;
227 static void dsa_master_ethtool_teardown(struct net_device *dev)
229 struct dsa_port *cpu_dp = dev->dsa_ptr;
231 dev->ethtool_ops = cpu_dp->orig_ethtool_ops;
232 cpu_dp->orig_ethtool_ops = NULL;
235 static int dsa_master_ndo_setup(struct net_device *dev)
237 struct dsa_port *cpu_dp = dev->dsa_ptr;
238 struct dsa_switch *ds = cpu_dp->ds;
239 struct net_device_ops *ops;
241 if (dev->netdev_ops->ndo_get_phys_port_name)
244 ops = devm_kzalloc(ds->dev, sizeof(*ops), GFP_KERNEL);
248 cpu_dp->orig_ndo_ops = dev->netdev_ops;
249 if (cpu_dp->orig_ndo_ops)
250 memcpy(ops, cpu_dp->orig_ndo_ops, sizeof(*ops));
252 ops->ndo_get_phys_port_name = dsa_master_get_phys_port_name;
254 dev->netdev_ops = ops;
259 static void dsa_master_ndo_teardown(struct net_device *dev)
261 struct dsa_port *cpu_dp = dev->dsa_ptr;
263 if (cpu_dp->orig_ndo_ops)
264 dev->netdev_ops = cpu_dp->orig_ndo_ops;
265 cpu_dp->orig_ndo_ops = NULL;
268 static ssize_t tagging_show(struct device *d, struct device_attribute *attr,
271 struct net_device *dev = to_net_dev(d);
272 struct dsa_port *cpu_dp = dev->dsa_ptr;
274 return sprintf(buf, "%s\n",
275 dsa_tag_protocol_to_str(cpu_dp->tag_ops));
277 static DEVICE_ATTR_RO(tagging);
279 static struct attribute *dsa_slave_attrs[] = {
280 &dev_attr_tagging.attr,
284 static const struct attribute_group dsa_group = {
286 .attrs = dsa_slave_attrs,
289 static void dsa_master_set_mtu(struct net_device *dev, struct dsa_port *cpu_dp)
291 unsigned int mtu = ETH_DATA_LEN + cpu_dp->tag_ops->overhead;
295 if (mtu <= dev->max_mtu) {
296 err = dev_set_mtu(dev, mtu);
298 netdev_dbg(dev, "Unable to set MTU to include for DSA overheads\n");
303 static void dsa_master_reset_mtu(struct net_device *dev)
308 err = dev_set_mtu(dev, ETH_DATA_LEN);
311 "Unable to reset MTU to exclude DSA overheads\n");
315 int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp)
319 dsa_master_set_mtu(dev, cpu_dp);
321 /* If we use a tagging format that doesn't have an ethertype
322 * field, make sure that all packets from this point on get
323 * sent to the tag format's receive function.
327 dev->dsa_ptr = cpu_dp;
328 ret = dsa_master_ethtool_setup(dev);
332 ret = dsa_master_ndo_setup(dev);
334 goto out_err_ethtool_teardown;
336 ret = sysfs_create_group(&dev->dev.kobj, &dsa_group);
338 goto out_err_ndo_teardown;
342 out_err_ndo_teardown:
343 dsa_master_ndo_teardown(dev);
344 out_err_ethtool_teardown:
345 dsa_master_ethtool_teardown(dev);
349 void dsa_master_teardown(struct net_device *dev)
351 sysfs_remove_group(&dev->dev.kobj, &dsa_group);
352 dsa_master_ndo_teardown(dev);
353 dsa_master_ethtool_teardown(dev);
354 dsa_master_reset_mtu(dev);
358 /* If we used a tagging format that doesn't have an ethertype
359 * field, make sure that all packets from this point get sent
360 * without the tag and go through the regular receive path.