1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * net/dsa/dsa_priv.h - Hardware switch handling
4 * Copyright (c) 2008-2009 Marvell Semiconductor
10 #include <linux/if_bridge.h>
11 #include <linux/if_vlan.h>
12 #include <linux/phy.h>
13 #include <linux/netdevice.h>
14 #include <linux/netpoll.h>
16 #include <net/gro_cells.h>
18 #define DSA_MAX_NUM_OFFLOADING_BRIDGES BITS_PER_LONG
21 DSA_NOTIFIER_AGEING_TIME,
22 DSA_NOTIFIER_BRIDGE_JOIN,
23 DSA_NOTIFIER_BRIDGE_LEAVE,
26 DSA_NOTIFIER_HOST_FDB_ADD,
27 DSA_NOTIFIER_HOST_FDB_DEL,
28 DSA_NOTIFIER_LAG_CHANGE,
29 DSA_NOTIFIER_LAG_JOIN,
30 DSA_NOTIFIER_LAG_LEAVE,
33 DSA_NOTIFIER_HOST_MDB_ADD,
34 DSA_NOTIFIER_HOST_MDB_DEL,
35 DSA_NOTIFIER_VLAN_ADD,
36 DSA_NOTIFIER_VLAN_DEL,
38 DSA_NOTIFIER_TAG_PROTO,
39 DSA_NOTIFIER_TAG_PROTO_CONNECT,
40 DSA_NOTIFIER_TAG_PROTO_DISCONNECT,
41 DSA_NOTIFIER_TAG_8021Q_VLAN_ADD,
42 DSA_NOTIFIER_TAG_8021Q_VLAN_DEL,
45 /* DSA_NOTIFIER_AGEING_TIME */
46 struct dsa_notifier_ageing_time_info {
47 unsigned int ageing_time;
50 /* DSA_NOTIFIER_BRIDGE_* */
51 struct dsa_notifier_bridge_info {
52 struct dsa_bridge bridge;
59 /* DSA_NOTIFIER_FDB_* */
60 struct dsa_notifier_fdb_info {
63 const unsigned char *addr;
67 /* DSA_NOTIFIER_MDB_* */
68 struct dsa_notifier_mdb_info {
69 const struct switchdev_obj_port_mdb *mdb;
74 /* DSA_NOTIFIER_LAG_* */
75 struct dsa_notifier_lag_info {
76 struct net_device *lag;
80 struct netdev_lag_upper_info *info;
83 /* DSA_NOTIFIER_VLAN_* */
84 struct dsa_notifier_vlan_info {
85 const struct switchdev_obj_port_vlan *vlan;
88 struct netlink_ext_ack *extack;
91 /* DSA_NOTIFIER_MTU */
92 struct dsa_notifier_mtu_info {
99 /* DSA_NOTIFIER_TAG_PROTO_* */
100 struct dsa_notifier_tag_proto_info {
101 const struct dsa_device_ops *tag_ops;
104 /* DSA_NOTIFIER_TAG_8021Q_VLAN_* */
105 struct dsa_notifier_tag_8021q_vlan_info {
112 struct dsa_switchdev_event_work {
113 struct dsa_switch *ds;
115 struct net_device *dev;
116 struct work_struct work;
118 /* Specific for SWITCHDEV_FDB_ADD_TO_DEVICE and
119 * SWITCHDEV_FDB_DEL_TO_DEVICE
121 unsigned char addr[ETH_ALEN];
126 struct dsa_slave_priv {
127 /* Copy of CPU port xmit for faster access in slave transmit hot path */
128 struct sk_buff * (*xmit)(struct sk_buff *skb,
129 struct net_device *dev);
131 struct gro_cells gcells;
133 /* DSA port data, such as switch, port index, etc. */
136 #ifdef CONFIG_NET_POLL_CONTROLLER
137 struct netpoll *netpoll;
141 struct list_head mall_tc_list;
145 const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol);
146 void dsa_tag_driver_put(const struct dsa_device_ops *ops);
147 const struct dsa_device_ops *dsa_find_tagger_by_name(const char *buf);
149 bool dsa_schedule_work(struct work_struct *work);
150 void dsa_flush_workqueue(void);
151 const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops);
153 static inline int dsa_tag_protocol_overhead(const struct dsa_device_ops *ops)
155 return ops->needed_headroom + ops->needed_tailroom;
159 int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp);
160 void dsa_master_teardown(struct net_device *dev);
162 static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
163 int device, int port)
165 struct dsa_port *cpu_dp = dev->dsa_ptr;
166 struct dsa_switch_tree *dst = cpu_dp->dst;
169 list_for_each_entry(dp, &dst->ports, list)
170 if (dp->ds->index == device && dp->index == port &&
171 dp->type == DSA_PORT_TYPE_USER)
178 void dsa_port_set_tag_protocol(struct dsa_port *cpu_dp,
179 const struct dsa_device_ops *tag_ops);
180 int dsa_port_set_state(struct dsa_port *dp, u8 state, bool do_fast_age);
181 int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy);
182 int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy);
183 void dsa_port_disable_rt(struct dsa_port *dp);
184 void dsa_port_disable(struct dsa_port *dp);
185 int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br,
186 struct netlink_ext_ack *extack);
187 void dsa_port_pre_bridge_leave(struct dsa_port *dp, struct net_device *br);
188 void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br);
189 int dsa_port_lag_change(struct dsa_port *dp,
190 struct netdev_lag_lower_state_info *linfo);
191 int dsa_port_lag_join(struct dsa_port *dp, struct net_device *lag_dev,
192 struct netdev_lag_upper_info *uinfo,
193 struct netlink_ext_ack *extack);
194 void dsa_port_pre_lag_leave(struct dsa_port *dp, struct net_device *lag_dev);
195 void dsa_port_lag_leave(struct dsa_port *dp, struct net_device *lag_dev);
196 int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
197 struct netlink_ext_ack *extack);
198 bool dsa_port_skip_vlan_configuration(struct dsa_port *dp);
199 int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock);
200 int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
201 bool targeted_match);
202 int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
204 int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
206 int dsa_port_host_fdb_add(struct dsa_port *dp, const unsigned char *addr,
208 int dsa_port_host_fdb_del(struct dsa_port *dp, const unsigned char *addr,
210 int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data);
211 int dsa_port_mdb_add(const struct dsa_port *dp,
212 const struct switchdev_obj_port_mdb *mdb);
213 int dsa_port_mdb_del(const struct dsa_port *dp,
214 const struct switchdev_obj_port_mdb *mdb);
215 int dsa_port_host_mdb_add(const struct dsa_port *dp,
216 const struct switchdev_obj_port_mdb *mdb);
217 int dsa_port_host_mdb_del(const struct dsa_port *dp,
218 const struct switchdev_obj_port_mdb *mdb);
219 int dsa_port_pre_bridge_flags(const struct dsa_port *dp,
220 struct switchdev_brport_flags flags,
221 struct netlink_ext_ack *extack);
222 int dsa_port_bridge_flags(struct dsa_port *dp,
223 struct switchdev_brport_flags flags,
224 struct netlink_ext_ack *extack);
225 int dsa_port_vlan_add(struct dsa_port *dp,
226 const struct switchdev_obj_port_vlan *vlan,
227 struct netlink_ext_ack *extack);
228 int dsa_port_vlan_del(struct dsa_port *dp,
229 const struct switchdev_obj_port_vlan *vlan);
230 int dsa_port_mrp_add(const struct dsa_port *dp,
231 const struct switchdev_obj_mrp *mrp);
232 int dsa_port_mrp_del(const struct dsa_port *dp,
233 const struct switchdev_obj_mrp *mrp);
234 int dsa_port_mrp_add_ring_role(const struct dsa_port *dp,
235 const struct switchdev_obj_ring_role_mrp *mrp);
236 int dsa_port_mrp_del_ring_role(const struct dsa_port *dp,
237 const struct switchdev_obj_ring_role_mrp *mrp);
238 int dsa_port_phylink_create(struct dsa_port *dp);
239 int dsa_port_link_register_of(struct dsa_port *dp);
240 void dsa_port_link_unregister_of(struct dsa_port *dp);
241 int dsa_port_hsr_join(struct dsa_port *dp, struct net_device *hsr);
242 void dsa_port_hsr_leave(struct dsa_port *dp, struct net_device *hsr);
243 int dsa_port_tag_8021q_vlan_add(struct dsa_port *dp, u16 vid, bool broadcast);
244 void dsa_port_tag_8021q_vlan_del(struct dsa_port *dp, u16 vid, bool broadcast);
247 extern const struct dsa_device_ops notag_netdev_ops;
248 extern struct notifier_block dsa_slave_switchdev_notifier;
249 extern struct notifier_block dsa_slave_switchdev_blocking_notifier;
251 void dsa_slave_mii_bus_init(struct dsa_switch *ds);
252 int dsa_slave_create(struct dsa_port *dp);
253 void dsa_slave_destroy(struct net_device *slave_dev);
254 int dsa_slave_suspend(struct net_device *slave_dev);
255 int dsa_slave_resume(struct net_device *slave_dev);
256 int dsa_slave_register_notifier(void);
257 void dsa_slave_unregister_notifier(void);
258 void dsa_slave_setup_tagger(struct net_device *slave);
259 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu);
260 int dsa_slave_manage_vlan_filtering(struct net_device *dev,
261 bool vlan_filtering);
263 static inline struct dsa_port *dsa_slave_to_port(const struct net_device *dev)
265 struct dsa_slave_priv *p = netdev_priv(dev);
270 static inline struct net_device *
271 dsa_slave_to_master(const struct net_device *dev)
273 struct dsa_port *dp = dsa_slave_to_port(dev);
275 return dp->cpu_dp->master;
278 /* If under a bridge with vlan_filtering=0, make sure to send pvid-tagged
279 * frames as untagged, since the bridge will not untag them.
281 static inline struct sk_buff *dsa_untag_bridge_pvid(struct sk_buff *skb)
283 struct dsa_port *dp = dsa_slave_to_port(skb->dev);
284 struct net_device *br = dsa_port_bridge_dev_get(dp);
285 struct net_device *dev = skb->dev;
286 struct net_device *upper_dev;
287 u16 vid, pvid, proto;
290 if (!br || br_vlan_enabled(br))
293 err = br_vlan_get_proto(br, &proto);
297 /* Move VLAN tag from data to hwaccel */
298 if (!skb_vlan_tag_present(skb) && skb->protocol == htons(proto)) {
299 skb = skb_vlan_untag(skb);
304 if (!skb_vlan_tag_present(skb))
307 vid = skb_vlan_tag_get_id(skb);
309 /* We already run under an RCU read-side critical section since
310 * we are called from netif_receive_skb_list_internal().
312 err = br_vlan_get_pvid_rcu(dev, &pvid);
319 /* The sad part about attempting to untag from DSA is that we
320 * don't know, unless we check, if the skb will end up in
321 * the bridge's data path - br_allowed_ingress() - or not.
322 * For example, there might be an 8021q upper for the
323 * default_pvid of the bridge, which will steal VLAN-tagged traffic
324 * from the bridge's data path. This is a configuration that DSA
325 * supports because vlan_filtering is 0. In that case, we should
326 * definitely keep the tag, to make sure it keeps working.
328 upper_dev = __vlan_find_dev_deep_rcu(br, htons(proto), vid);
332 __vlan_hwaccel_clear_tag(skb);
337 /* For switches without hardware support for DSA tagging to be able
338 * to support termination through the bridge.
340 static inline struct net_device *
341 dsa_find_designated_bridge_port_by_vid(struct net_device *master, u16 vid)
343 struct dsa_port *cpu_dp = master->dsa_ptr;
344 struct dsa_switch_tree *dst = cpu_dp->dst;
345 struct bridge_vlan_info vinfo;
346 struct net_device *slave;
350 list_for_each_entry(dp, &dst->ports, list) {
351 if (dp->type != DSA_PORT_TYPE_USER)
357 if (dp->stp_state != BR_STATE_LEARNING &&
358 dp->stp_state != BR_STATE_FORWARDING)
361 /* Since the bridge might learn this packet, keep the CPU port
362 * affinity with the port that will be used for the reply on
365 if (dp->cpu_dp != cpu_dp)
370 err = br_vlan_get_info_rcu(slave, vid, &vinfo);
380 /* If the ingress port offloads the bridge, we mark the frame as autonomously
381 * forwarded by hardware, so the software bridge doesn't forward in twice, back
382 * to us, because we already did. However, if we're in fallback mode and we do
383 * software bridging, we are not offloading it, therefore the dp->bridge
384 * pointer is not populated, and flooding needs to be done by software (we are
385 * effectively operating in standalone ports mode).
387 static inline void dsa_default_offload_fwd_mark(struct sk_buff *skb)
389 struct dsa_port *dp = dsa_slave_to_port(skb->dev);
391 skb->offload_fwd_mark = !!(dp->bridge);
394 /* Helper for removing DSA header tags from packets in the RX path.
395 * Must not be called before skb_pull(len).
399 * | | | | | | | | | | | | | | | | | | |
400 * +-----------------------+-----------------------+---------------+-------+
401 * | Destination MAC | Source MAC | DSA header | EType |
402 * +-----------------------+-----------------------+---------------+-------+
404 * <----- len -----> <----- len ----->
407 * >>>>>>> | | | | | | | | | | | | | | |
408 * >>>>>>> +-----------------------+-----------------------+-------+
409 * >>>>>>> | Destination MAC | Source MAC | EType |
410 * +-----------------------+-----------------------+-------+
415 static inline void dsa_strip_etype_header(struct sk_buff *skb, int len)
417 memmove(skb->data - ETH_HLEN, skb->data - ETH_HLEN - len, 2 * ETH_ALEN);
420 /* Helper for creating space for DSA header tags in TX path packets.
421 * Must not be called before skb_push(len).
425 * <<<<<<< | | | | | | | | | | | | | | |
426 * ^ <<<<<<< +-----------------------+-----------------------+-------+
427 * | <<<<<<< | Destination MAC | Source MAC | EType |
428 * | +-----------------------+-----------------------+-------+
436 * | | | | | | | | | | | | | | | | | | |
437 * +-----------------------+-----------------------+---------------+-------+
438 * | Destination MAC | Source MAC | DSA header | EType |
439 * +-----------------------+-----------------------+---------------+-------+
441 * | <----- len ----->
444 static inline void dsa_alloc_etype_header(struct sk_buff *skb, int len)
446 memmove(skb->data, skb->data + len, 2 * ETH_ALEN);
449 /* On RX, eth_type_trans() on the DSA master pulls ETH_HLEN bytes starting from
450 * skb_mac_header(skb), which leaves skb->data pointing at the first byte after
451 * what the DSA master perceives as the EtherType (the beginning of the L3
452 * protocol). Since DSA EtherType header taggers treat the EtherType as part of
453 * the DSA tag itself, and the EtherType is 2 bytes in length, the DSA header
454 * is located 2 bytes behind skb->data. Note that EtherType in this context
455 * means the first 2 bytes of the DSA header, not the encapsulated EtherType
456 * that will become visible after the DSA header is stripped.
458 static inline void *dsa_etype_header_pos_rx(struct sk_buff *skb)
460 return skb->data - 2;
463 /* On TX, skb->data points to skb_mac_header(skb), which means that EtherType
464 * header taggers start exactly where the EtherType is (the EtherType is
465 * treated as part of the DSA header).
467 static inline void *dsa_etype_header_pos_tx(struct sk_buff *skb)
469 return skb->data + 2 * ETH_ALEN;
473 int dsa_switch_register_notifier(struct dsa_switch *ds);
474 void dsa_switch_unregister_notifier(struct dsa_switch *ds);
477 void dsa_lag_map(struct dsa_switch_tree *dst, struct net_device *lag);
478 void dsa_lag_unmap(struct dsa_switch_tree *dst, struct net_device *lag);
479 int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v);
480 int dsa_broadcast(unsigned long e, void *v);
481 int dsa_tree_change_tag_proto(struct dsa_switch_tree *dst,
482 struct net_device *master,
483 const struct dsa_device_ops *tag_ops,
484 const struct dsa_device_ops *old_tag_ops);
485 unsigned int dsa_bridge_num_get(const struct net_device *bridge_dev, int max);
486 void dsa_bridge_num_put(const struct net_device *bridge_dev,
487 unsigned int bridge_num);
488 struct dsa_bridge *dsa_tree_bridge_find(struct dsa_switch_tree *dst,
489 const struct net_device *br);
492 int dsa_tag_8021q_bridge_join(struct dsa_switch *ds,
493 struct dsa_notifier_bridge_info *info);
494 int dsa_tag_8021q_bridge_leave(struct dsa_switch *ds,
495 struct dsa_notifier_bridge_info *info);
496 int dsa_switch_tag_8021q_vlan_add(struct dsa_switch *ds,
497 struct dsa_notifier_tag_8021q_vlan_info *info);
498 int dsa_switch_tag_8021q_vlan_del(struct dsa_switch *ds,
499 struct dsa_notifier_tag_8021q_vlan_info *info);
501 extern struct list_head dsa_tree_list;