1 #include <linux/export.h>
2 #include <linux/kref.h>
3 #include <linux/list.h>
4 #include <linux/mutex.h>
5 #include <linux/phylink.h>
6 #include <linux/rtnetlink.h>
7 #include <linux/slab.h>
12 * struct sfp_bus - internal representation of a sfp bus
17 struct list_head node;
18 struct fwnode_handle *fwnode;
20 const struct sfp_socket_ops *socket_ops;
21 struct device *sfp_dev;
24 const struct sfp_upstream_ops *upstream_ops;
26 struct net_device *netdev;
27 struct phy_device *phydev;
34 * sfp_parse_port() - Parse the EEPROM base ID, setting the port type
35 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
36 * @id: a pointer to the module's &struct sfp_eeprom_id
37 * @support: optional pointer to an array of unsigned long for the
38 * ethtool support mask
40 * Parse the EEPROM identification given in @id, and return one of
41 * %PORT_TP, %PORT_FIBRE or %PORT_OTHER. If @support is non-%NULL,
42 * also set the ethtool %ETHTOOL_LINK_MODE_xxx_BIT corresponding with
45 * If the port type is not known, returns %PORT_OTHER.
47 int sfp_parse_port(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
48 unsigned long *support)
52 /* port is the physical connector, set this from the connector field. */
53 switch (id->base.connector) {
54 case SFP_CONNECTOR_SC:
55 case SFP_CONNECTOR_FIBERJACK:
56 case SFP_CONNECTOR_LC:
57 case SFP_CONNECTOR_MT_RJ:
58 case SFP_CONNECTOR_MU:
59 case SFP_CONNECTOR_OPTICAL_PIGTAIL:
63 case SFP_CONNECTOR_RJ45:
67 case SFP_CONNECTOR_COPPER_PIGTAIL:
71 case SFP_CONNECTOR_UNSPEC:
72 if (id->base.e1000_base_t) {
77 case SFP_CONNECTOR_SG: /* guess */
78 case SFP_CONNECTOR_MPO_1X12:
79 case SFP_CONNECTOR_MPO_2X16:
80 case SFP_CONNECTOR_HSSDC_II:
81 case SFP_CONNECTOR_NOSEPARATE:
82 case SFP_CONNECTOR_MXC_2X16:
86 dev_warn(bus->sfp_dev, "SFP: unknown connector id 0x%02x\n",
95 phylink_set(support, FIBRE);
99 phylink_set(support, TP);
106 EXPORT_SYMBOL_GPL(sfp_parse_port);
109 * sfp_parse_interface() - Parse the phy_interface_t
110 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
111 * @id: a pointer to the module's &struct sfp_eeprom_id
113 * Derive the phy_interface_t mode for the information found in the
114 * module's identifying EEPROM. There is no standard or defined way
115 * to derive this information, so we use some heuristics.
117 * If the encoding is 64b66b, then the module must be >= 10G, so
118 * return %PHY_INTERFACE_MODE_10GKR.
120 * If it's 8b10b, then it's 1G or slower. If it's definitely a fibre
121 * module, return %PHY_INTERFACE_MODE_1000BASEX mode, otherwise return
122 * %PHY_INTERFACE_MODE_SGMII mode.
124 * If the encoding is not known, return %PHY_INTERFACE_MODE_NA.
126 phy_interface_t sfp_parse_interface(struct sfp_bus *bus,
127 const struct sfp_eeprom_id *id)
129 phy_interface_t iface;
131 /* Setting the serdes link mode is guesswork: there's no field in
132 * the EEPROM which indicates what mode should be used.
134 * If the module wants 64b66b, then it must be >= 10G.
136 * If it's a gigabit-only fiber module, it probably does not have
137 * a PHY, so switch to 802.3z negotiation mode. Otherwise, switch
138 * to SGMII mode (which is required to support non-gigabit speeds).
140 switch (id->base.encoding) {
141 case SFP_ENCODING_8472_64B66B:
142 iface = PHY_INTERFACE_MODE_10GKR;
145 case SFP_ENCODING_8B10B:
146 if (!id->base.e1000_base_t &&
147 !id->base.e100_base_lx &&
148 !id->base.e100_base_fx)
149 iface = PHY_INTERFACE_MODE_1000BASEX;
151 iface = PHY_INTERFACE_MODE_SGMII;
155 if (id->base.e1000_base_cx) {
156 iface = PHY_INTERFACE_MODE_1000BASEX;
160 iface = PHY_INTERFACE_MODE_NA;
161 dev_err(bus->sfp_dev,
162 "SFP module encoding does not support 8b10b nor 64b66b\n");
168 EXPORT_SYMBOL_GPL(sfp_parse_interface);
171 * sfp_parse_support() - Parse the eeprom id for supported link modes
172 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
173 * @id: a pointer to the module's &struct sfp_eeprom_id
174 * @support: pointer to an array of unsigned long for the ethtool support mask
176 * Parse the EEPROM identification information and derive the supported
177 * ethtool link modes for the module.
179 void sfp_parse_support(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
180 unsigned long *support)
182 unsigned int br_min, br_nom, br_max;
183 __ETHTOOL_DECLARE_LINK_MODE_MASK(modes) = { 0, };
185 /* Decode the bitrate information to MBd */
186 br_min = br_nom = br_max = 0;
187 if (id->base.br_nominal) {
188 if (id->base.br_nominal != 255) {
189 br_nom = id->base.br_nominal * 100;
190 br_min = br_nom + id->base.br_nominal * id->ext.br_min;
191 br_max = br_nom + id->base.br_nominal * id->ext.br_max;
192 } else if (id->ext.br_max) {
193 br_nom = 250 * id->ext.br_max;
194 br_max = br_nom + br_nom * id->ext.br_min / 100;
195 br_min = br_nom - br_nom * id->ext.br_min / 100;
199 /* Set ethtool support from the compliance fields. */
200 if (id->base.e10g_base_sr)
201 phylink_set(modes, 10000baseSR_Full);
202 if (id->base.e10g_base_lr)
203 phylink_set(modes, 10000baseLR_Full);
204 if (id->base.e10g_base_lrm)
205 phylink_set(modes, 10000baseLRM_Full);
206 if (id->base.e10g_base_er)
207 phylink_set(modes, 10000baseER_Full);
208 if (id->base.e1000_base_sx ||
209 id->base.e1000_base_lx ||
210 id->base.e1000_base_cx)
211 phylink_set(modes, 1000baseX_Full);
212 if (id->base.e1000_base_t) {
213 phylink_set(modes, 1000baseT_Half);
214 phylink_set(modes, 1000baseT_Full);
217 /* 1000Base-PX or 1000Base-BX10 */
218 if ((id->base.e_base_px || id->base.e_base_bx10) &&
219 br_min <= 1300 && br_max >= 1200)
220 phylink_set(support, 1000baseX_Full);
222 /* For active or passive cables, select the link modes
223 * based on the bit rates and the cable compliance bytes.
225 if ((id->base.sfp_ct_passive || id->base.sfp_ct_active) && br_nom) {
226 /* This may look odd, but some manufacturers use 12000MBd */
227 if (br_min <= 12000 && br_max >= 10300)
228 phylink_set(modes, 10000baseCR_Full);
229 if (br_min <= 3200 && br_max >= 3100)
230 phylink_set(modes, 2500baseX_Full);
231 if (br_min <= 1300 && br_max >= 1200)
232 phylink_set(modes, 1000baseX_Full);
234 if (id->base.sfp_ct_passive) {
235 if (id->base.passive.sff8431_app_e)
236 phylink_set(modes, 10000baseCR_Full);
238 if (id->base.sfp_ct_active) {
239 if (id->base.active.sff8431_app_e ||
240 id->base.active.sff8431_lim) {
241 phylink_set(modes, 10000baseCR_Full);
245 switch (id->base.extended_cc) {
246 case 0x00: /* Unspecified */
248 case 0x02: /* 100Gbase-SR4 or 25Gbase-SR */
249 phylink_set(modes, 100000baseSR4_Full);
250 phylink_set(modes, 25000baseSR_Full);
252 case 0x03: /* 100Gbase-LR4 or 25Gbase-LR */
253 case 0x04: /* 100Gbase-ER4 or 25Gbase-ER */
254 phylink_set(modes, 100000baseLR4_ER4_Full);
256 case 0x0b: /* 100Gbase-CR4 or 25Gbase-CR CA-L */
257 case 0x0c: /* 25Gbase-CR CA-S */
258 case 0x0d: /* 25Gbase-CR CA-N */
259 phylink_set(modes, 100000baseCR4_Full);
260 phylink_set(modes, 25000baseCR_Full);
263 dev_warn(bus->sfp_dev,
264 "Unknown/unsupported extended compliance code: 0x%02x\n",
265 id->base.extended_cc);
269 /* For fibre channel SFP, derive possible BaseX modes */
270 if (id->base.fc_speed_100 ||
271 id->base.fc_speed_200 ||
272 id->base.fc_speed_400) {
273 if (id->base.br_nominal >= 31)
274 phylink_set(modes, 2500baseX_Full);
275 if (id->base.br_nominal >= 12)
276 phylink_set(modes, 1000baseX_Full);
279 /* If we haven't discovered any modes that this module supports, try
280 * the encoding and bitrate to determine supported modes. Some BiDi
281 * modules (eg, 1310nm/1550nm) are not 1000BASE-BX compliant due to
282 * the differing wavelengths, so do not set any transceiver bits.
284 if (bitmap_empty(modes, __ETHTOOL_LINK_MODE_MASK_NBITS)) {
285 /* If the encoding and bit rate allows 1000baseX */
286 if (id->base.encoding == SFP_ENCODING_8B10B && br_nom &&
287 br_min <= 1300 && br_max >= 1200)
288 phylink_set(modes, 1000baseX_Full);
291 bitmap_or(support, support, modes, __ETHTOOL_LINK_MODE_MASK_NBITS);
293 phylink_set(support, Autoneg);
294 phylink_set(support, Pause);
295 phylink_set(support, Asym_Pause);
297 EXPORT_SYMBOL_GPL(sfp_parse_support);
299 static LIST_HEAD(sfp_buses);
300 static DEFINE_MUTEX(sfp_mutex);
302 static const struct sfp_upstream_ops *sfp_get_upstream_ops(struct sfp_bus *bus)
304 return bus->registered ? bus->upstream_ops : NULL;
307 static struct sfp_bus *sfp_bus_get(struct fwnode_handle *fwnode)
309 struct sfp_bus *sfp, *new, *found = NULL;
311 new = kzalloc(sizeof(*new), GFP_KERNEL);
313 mutex_lock(&sfp_mutex);
315 list_for_each_entry(sfp, &sfp_buses, node) {
316 if (sfp->fwnode == fwnode) {
317 kref_get(&sfp->kref);
324 kref_init(&new->kref);
325 new->fwnode = fwnode;
326 list_add(&new->node, &sfp_buses);
331 mutex_unlock(&sfp_mutex);
338 static void sfp_bus_release(struct kref *kref)
340 struct sfp_bus *bus = container_of(kref, struct sfp_bus, kref);
342 list_del(&bus->node);
343 mutex_unlock(&sfp_mutex);
347 static void sfp_bus_put(struct sfp_bus *bus)
349 kref_put_mutex(&bus->kref, sfp_bus_release, &sfp_mutex);
352 static int sfp_register_bus(struct sfp_bus *bus)
354 const struct sfp_upstream_ops *ops = bus->upstream_ops;
359 ops->link_down(bus->upstream);
360 if (ops->connect_phy && bus->phydev) {
361 ret = ops->connect_phy(bus->upstream, bus->phydev);
367 bus->socket_ops->start(bus->sfp);
368 bus->registered = true;
372 static void sfp_unregister_bus(struct sfp_bus *bus)
374 const struct sfp_upstream_ops *ops = bus->upstream_ops;
376 if (bus->registered) {
378 bus->socket_ops->stop(bus->sfp);
379 if (bus->phydev && ops && ops->disconnect_phy)
380 ops->disconnect_phy(bus->upstream);
382 bus->registered = false;
386 * sfp_get_module_info() - Get the ethtool_modinfo for a SFP module
387 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
388 * @modinfo: a &struct ethtool_modinfo
390 * Fill in the type and eeprom_len parameters in @modinfo for a module on
391 * the sfp bus specified by @bus.
393 * Returns 0 on success or a negative errno number.
395 int sfp_get_module_info(struct sfp_bus *bus, struct ethtool_modinfo *modinfo)
397 if (!bus->registered)
399 return bus->socket_ops->module_info(bus->sfp, modinfo);
401 EXPORT_SYMBOL_GPL(sfp_get_module_info);
404 * sfp_get_module_eeprom() - Read the SFP module EEPROM
405 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
406 * @ee: a &struct ethtool_eeprom
407 * @data: buffer to contain the EEPROM data (must be at least @ee->len bytes)
409 * Read the EEPROM as specified by the supplied @ee. See the documentation
410 * for &struct ethtool_eeprom for the region to be read.
412 * Returns 0 on success or a negative errno number.
414 int sfp_get_module_eeprom(struct sfp_bus *bus, struct ethtool_eeprom *ee,
417 if (!bus->registered)
419 return bus->socket_ops->module_eeprom(bus->sfp, ee, data);
421 EXPORT_SYMBOL_GPL(sfp_get_module_eeprom);
424 * sfp_upstream_start() - Inform the SFP that the network device is up
425 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
427 * Inform the SFP socket that the network device is now up, so that the
428 * module can be enabled by allowing TX_DISABLE to be deasserted. This
429 * should be called from the network device driver's &struct net_device_ops
432 void sfp_upstream_start(struct sfp_bus *bus)
435 bus->socket_ops->start(bus->sfp);
438 EXPORT_SYMBOL_GPL(sfp_upstream_start);
441 * sfp_upstream_stop() - Inform the SFP that the network device is down
442 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
444 * Inform the SFP socket that the network device is now up, so that the
445 * module can be disabled by asserting TX_DISABLE, disabling the laser
446 * in optical modules. This should be called from the network device
447 * driver's &struct net_device_ops ndo_stop() method.
449 void sfp_upstream_stop(struct sfp_bus *bus)
452 bus->socket_ops->stop(bus->sfp);
453 bus->started = false;
455 EXPORT_SYMBOL_GPL(sfp_upstream_stop);
458 * sfp_register_upstream() - Register the neighbouring device
459 * @fwnode: firmware node for the SFP bus
460 * @ndev: network device associated with the interface
461 * @upstream: the upstream private data
462 * @ops: the upstream's &struct sfp_upstream_ops
464 * Register the upstream device (eg, PHY) with the SFP bus. MAC drivers
465 * should use phylink, which will call this function for them. Returns
466 * a pointer to the allocated &struct sfp_bus.
468 * On error, returns %NULL.
470 struct sfp_bus *sfp_register_upstream(struct fwnode_handle *fwnode,
471 struct net_device *ndev, void *upstream,
472 const struct sfp_upstream_ops *ops)
474 struct sfp_bus *bus = sfp_bus_get(fwnode);
479 bus->upstream_ops = ops;
480 bus->upstream = upstream;
484 ret = sfp_register_bus(bus);
495 EXPORT_SYMBOL_GPL(sfp_register_upstream);
498 * sfp_unregister_upstream() - Unregister sfp bus
499 * @bus: a pointer to the &struct sfp_bus structure for the sfp module
501 * Unregister a previously registered upstream connection for the SFP
502 * module. @bus is returned from sfp_register_upstream().
504 void sfp_unregister_upstream(struct sfp_bus *bus)
508 sfp_unregister_bus(bus);
509 bus->upstream = NULL;
515 EXPORT_SYMBOL_GPL(sfp_unregister_upstream);
517 /* Socket driver entry points */
518 int sfp_add_phy(struct sfp_bus *bus, struct phy_device *phydev)
520 const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
523 if (ops && ops->connect_phy)
524 ret = ops->connect_phy(bus->upstream, phydev);
527 bus->phydev = phydev;
531 EXPORT_SYMBOL_GPL(sfp_add_phy);
533 void sfp_remove_phy(struct sfp_bus *bus)
535 const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
537 if (ops && ops->disconnect_phy)
538 ops->disconnect_phy(bus->upstream);
541 EXPORT_SYMBOL_GPL(sfp_remove_phy);
543 void sfp_link_up(struct sfp_bus *bus)
545 const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
547 if (ops && ops->link_up)
548 ops->link_up(bus->upstream);
550 EXPORT_SYMBOL_GPL(sfp_link_up);
552 void sfp_link_down(struct sfp_bus *bus)
554 const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
556 if (ops && ops->link_down)
557 ops->link_down(bus->upstream);
559 EXPORT_SYMBOL_GPL(sfp_link_down);
561 int sfp_module_insert(struct sfp_bus *bus, const struct sfp_eeprom_id *id)
563 const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
566 if (ops && ops->module_insert)
567 ret = ops->module_insert(bus->upstream, id);
571 EXPORT_SYMBOL_GPL(sfp_module_insert);
573 void sfp_module_remove(struct sfp_bus *bus)
575 const struct sfp_upstream_ops *ops = sfp_get_upstream_ops(bus);
577 if (ops && ops->module_remove)
578 ops->module_remove(bus->upstream);
580 EXPORT_SYMBOL_GPL(sfp_module_remove);
582 struct sfp_bus *sfp_register_socket(struct device *dev, struct sfp *sfp,
583 const struct sfp_socket_ops *ops)
585 struct sfp_bus *bus = sfp_bus_get(dev->fwnode);
592 bus->socket_ops = ops;
595 ret = sfp_register_bus(bus);
606 EXPORT_SYMBOL_GPL(sfp_register_socket);
608 void sfp_unregister_socket(struct sfp_bus *bus)
612 sfp_unregister_bus(bus);
615 bus->socket_ops = NULL;
620 EXPORT_SYMBOL_GPL(sfp_unregister_socket);