net/dsa/slave.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * net/dsa/slave.c - Slave device handling
0004  * Copyright (c) 2008-2009 Marvell Semiconductor
0005  */
0006
0007 #include <linux/list.h>
0008 #include <linux/etherdevice.h>
0009 #include <linux/netdevice.h>
0010 #include <linux/phy.h>
0011 #include <linux/phy_fixed.h>
0012 #include <linux/phylink.h>
0013 #include <linux/of_net.h>
0014 #include <linux/of_mdio.h>
0015 #include <linux/mdio.h>
0016 #include <net/rtnetlink.h>
0017 #include <net/pkt_cls.h>
0018 #include <net/selftests.h>
0019 #include <net/tc_act/tc_mirred.h>
0020 #include <linux/if_bridge.h>
0021 #include <linux/if_hsr.h>
0022 #include <net/dcbnl.h>
0023 #include <linux/netpoll.h>
0024
0025 #include "dsa_priv.h"
0026
0027 static void dsa_slave_standalone_event_work(struct work_struct *work)
0028 {
0029     struct dsa_standalone_event_work *standalone_work =
0030         container_of(work, struct dsa_standalone_event_work, work);
0031     const unsigned char *addr = standalone_work->addr;
0032     struct net_device *dev = standalone_work->dev;
0033     struct dsa_port *dp = dsa_slave_to_port(dev);
0034     struct switchdev_obj_port_mdb mdb;
0035     struct dsa_switch *ds = dp->ds;
0036     u16 vid = standalone_work->vid;
0037     int err;
0038
0039     switch (standalone_work->event) {
0040     case DSA_UC_ADD:
0041         err = dsa_port_standalone_host_fdb_add(dp, addr, vid);
0042         if (err) {
0043             dev_err(ds->dev,
0044                 "port %d failed to add %pM vid %d to fdb: %d\n",
0045                 dp->index, addr, vid, err);
0046             break;
0047         }
0048         break;
0049
0050     case DSA_UC_DEL:
0051         err = dsa_port_standalone_host_fdb_del(dp, addr, vid);
0052         if (err) {
0053             dev_err(ds->dev,
0054                 "port %d failed to delete %pM vid %d from fdb: %d\n",
0055                 dp->index, addr, vid, err);
0056         }
0057
0058         break;
0059     case DSA_MC_ADD:
0060         ether_addr_copy(mdb.addr, addr);
0061         mdb.vid = vid;
0062
0063         err = dsa_port_standalone_host_mdb_add(dp, &mdb);
0064         if (err) {
0065             dev_err(ds->dev,
0066                 "port %d failed to add %pM vid %d to mdb: %d\n",
0067                 dp->index, addr, vid, err);
0068             break;
0069         }
0070         break;
0071     case DSA_MC_DEL:
0072         ether_addr_copy(mdb.addr, addr);
0073         mdb.vid = vid;
0074
0075         err = dsa_port_standalone_host_mdb_del(dp, &mdb);
0076         if (err) {
0077             dev_err(ds->dev,
0078                 "port %d failed to delete %pM vid %d from mdb: %d\n",
0079                 dp->index, addr, vid, err);
0080         }
0081
0082         break;
0083     }
0084
0085     kfree(standalone_work);
0086 }
0087
0088 static int dsa_slave_schedule_standalone_work(struct net_device *dev,
0089                           enum dsa_standalone_event event,
0090                           const unsigned char *addr,
0091                           u16 vid)
0092 {
0093     struct dsa_standalone_event_work *standalone_work;
0094
0095     standalone_work = kzalloc(sizeof(*standalone_work), GFP_ATOMIC);
0096     if (!standalone_work)
0097         return -ENOMEM;
0098
0099     INIT_WORK(&standalone_work->work, dsa_slave_standalone_event_work);
0100     standalone_work->event = event;
0101     standalone_work->dev = dev;
0102
0103     ether_addr_copy(standalone_work->addr, addr);
0104     standalone_work->vid = vid;
0105
0106     dsa_schedule_work(&standalone_work->work);
0107
0108     return 0;
0109 }
0110
0111 static int dsa_slave_sync_uc(struct net_device *dev,
0112                  const unsigned char *addr)
0113 {
0114     struct net_device *master = dsa_slave_to_master(dev);
0115     struct dsa_port *dp = dsa_slave_to_port(dev);
0116
0117     dev_uc_add(master, addr);
0118
0119     if (!dsa_switch_supports_uc_filtering(dp->ds))
0120         return 0;
0121
0122     return dsa_slave_schedule_standalone_work(dev, DSA_UC_ADD, addr, 0);
0123 }
0124
0125 static int dsa_slave_unsync_uc(struct net_device *dev,
0126                    const unsigned char *addr)
0127 {
0128     struct net_device *master = dsa_slave_to_master(dev);
0129     struct dsa_port *dp = dsa_slave_to_port(dev);
0130
0131     dev_uc_del(master, addr);
0132
0133     if (!dsa_switch_supports_uc_filtering(dp->ds))
0134         return 0;
0135
0136     return dsa_slave_schedule_standalone_work(dev, DSA_UC_DEL, addr, 0);
0137 }
0138
0139 static int dsa_slave_sync_mc(struct net_device *dev,
0140                  const unsigned char *addr)
0141 {
0142     struct net_device *master = dsa_slave_to_master(dev);
0143     struct dsa_port *dp = dsa_slave_to_port(dev);
0144
0145     dev_mc_add(master, addr);
0146
0147     if (!dsa_switch_supports_mc_filtering(dp->ds))
0148         return 0;
0149
0150     return dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD, addr, 0);
0151 }
0152
0153 static int dsa_slave_unsync_mc(struct net_device *dev,
0154                    const unsigned char *addr)
0155 {
0156     struct net_device *master = dsa_slave_to_master(dev);
0157     struct dsa_port *dp = dsa_slave_to_port(dev);
0158
0159     dev_mc_del(master, addr);
0160
0161     if (!dsa_switch_supports_mc_filtering(dp->ds))
0162         return 0;
0163
0164     return dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL, addr, 0);
0165 }
0166
0167 /* slave mii_bus handling ***************************************************/
0168 static int dsa_slave_phy_read(struct mii_bus *bus, int addr, int reg)
0169 {
0170     struct dsa_switch *ds = bus->priv;
0171
0172     if (ds->phys_mii_mask & (1 << addr))
0173         return ds->ops->phy_read(ds, addr, reg);
0174
0175     return 0xffff;
0176 }
0177
0178 static int dsa_slave_phy_write(struct mii_bus *bus, int addr, int reg, u16 val)
0179 {
0180     struct dsa_switch *ds = bus->priv;
0181
0182     if (ds->phys_mii_mask & (1 << addr))
0183         return ds->ops->phy_write(ds, addr, reg, val);
0184
0185     return 0;
0186 }
0187
0188 void dsa_slave_mii_bus_init(struct dsa_switch *ds)
0189 {
0190     ds->slave_mii_bus->priv = (void *)ds;
0191     ds->slave_mii_bus->name = "dsa slave smi";
0192     ds->slave_mii_bus->read = dsa_slave_phy_read;
0193     ds->slave_mii_bus->write = dsa_slave_phy_write;
0194     snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
0195          ds->dst->index, ds->index);
0196     ds->slave_mii_bus->parent = ds->dev;
0197     ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
0198 }
0199
0200
0201 /* slave device handling ****************************************************/
0202 static int dsa_slave_get_iflink(const struct net_device *dev)
0203 {
0204     return dsa_slave_to_master(dev)->ifindex;
0205 }
0206
0207 static int dsa_slave_open(struct net_device *dev)
0208 {
0209     struct net_device *master = dsa_slave_to_master(dev);
0210     struct dsa_port *dp = dsa_slave_to_port(dev);
0211     struct dsa_switch *ds = dp->ds;
0212     int err;
0213
0214     err = dev_open(master, NULL);
0215     if (err < 0) {
0216         netdev_err(dev, "failed to open master %s\n", master->name);
0217         goto out;
0218     }
0219
0220     if (dsa_switch_supports_uc_filtering(ds)) {
0221         err = dsa_port_standalone_host_fdb_add(dp, dev->dev_addr, 0);
0222         if (err)
0223             goto out;
0224     }
0225
0226     if (!ether_addr_equal(dev->dev_addr, master->dev_addr)) {
0227         err = dev_uc_add(master, dev->dev_addr);
0228         if (err < 0)
0229             goto del_host_addr;
0230     }
0231
0232     err = dsa_port_enable_rt(dp, dev->phydev);
0233     if (err)
0234         goto del_unicast;
0235
0236     return 0;
0237
0238 del_unicast:
0239     if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
0240         dev_uc_del(master, dev->dev_addr);
0241 del_host_addr:
0242     if (dsa_switch_supports_uc_filtering(ds))
0243         dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
0244 out:
0245     return err;
0246 }
0247
0248 static int dsa_slave_close(struct net_device *dev)
0249 {
0250     struct net_device *master = dsa_slave_to_master(dev);
0251     struct dsa_port *dp = dsa_slave_to_port(dev);
0252     struct dsa_switch *ds = dp->ds;
0253
0254     dsa_port_disable_rt(dp);
0255
0256     if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
0257         dev_uc_del(master, dev->dev_addr);
0258
0259     if (dsa_switch_supports_uc_filtering(ds))
0260         dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
0261
0262     return 0;
0263 }
0264
0265 static void dsa_slave_manage_host_flood(struct net_device *dev)
0266 {
0267     bool mc = dev->flags & (IFF_PROMISC | IFF_ALLMULTI);
0268     struct dsa_port *dp = dsa_slave_to_port(dev);
0269     bool uc = dev->flags & IFF_PROMISC;
0270
0271     dsa_port_set_host_flood(dp, uc, mc);
0272 }
0273
0274 static void dsa_slave_change_rx_flags(struct net_device *dev, int change)
0275 {
0276     struct net_device *master = dsa_slave_to_master(dev);
0277     struct dsa_port *dp = dsa_slave_to_port(dev);
0278     struct dsa_switch *ds = dp->ds;
0279
0280     if (change & IFF_ALLMULTI)
0281         dev_set_allmulti(master,
0282                  dev->flags & IFF_ALLMULTI ? 1 : -1);
0283     if (change & IFF_PROMISC)
0284         dev_set_promiscuity(master,
0285                     dev->flags & IFF_PROMISC ? 1 : -1);
0286
0287     if (dsa_switch_supports_uc_filtering(ds) &&
0288         dsa_switch_supports_mc_filtering(ds))
0289         dsa_slave_manage_host_flood(dev);
0290 }
0291
0292 static void dsa_slave_set_rx_mode(struct net_device *dev)
0293 {
0294     __dev_mc_sync(dev, dsa_slave_sync_mc, dsa_slave_unsync_mc);
0295     __dev_uc_sync(dev, dsa_slave_sync_uc, dsa_slave_unsync_uc);
0296 }
0297
0298 static int dsa_slave_set_mac_address(struct net_device *dev, void *a)
0299 {
0300     struct net_device *master = dsa_slave_to_master(dev);
0301     struct dsa_port *dp = dsa_slave_to_port(dev);
0302     struct dsa_switch *ds = dp->ds;
0303     struct sockaddr *addr = a;
0304     int err;
0305
0306     if (!is_valid_ether_addr(addr->sa_data))
0307         return -EADDRNOTAVAIL;
0308
0309     /* If the port is down, the address isn't synced yet to hardware or
0310      * to the DSA master, so there is nothing to change.
0311      */
0312     if (!(dev->flags & IFF_UP))
0313         goto out_change_dev_addr;
0314
0315     if (dsa_switch_supports_uc_filtering(ds)) {
0316         err = dsa_port_standalone_host_fdb_add(dp, addr->sa_data, 0);
0317         if (err)
0318             return err;
0319     }
0320
0321     if (!ether_addr_equal(addr->sa_data, master->dev_addr)) {
0322         err = dev_uc_add(master, addr->sa_data);
0323         if (err < 0)
0324             goto del_unicast;
0325     }
0326
0327     if (!ether_addr_equal(dev->dev_addr, master->dev_addr))
0328         dev_uc_del(master, dev->dev_addr);
0329
0330     if (dsa_switch_supports_uc_filtering(ds))
0331         dsa_port_standalone_host_fdb_del(dp, dev->dev_addr, 0);
0332
0333 out_change_dev_addr:
0334     eth_hw_addr_set(dev, addr->sa_data);
0335
0336     return 0;
0337
0338 del_unicast:
0339     if (dsa_switch_supports_uc_filtering(ds))
0340         dsa_port_standalone_host_fdb_del(dp, addr->sa_data, 0);
0341
0342     return err;
0343 }
0344
0345 struct dsa_slave_dump_ctx {
0346     struct net_device *dev;
0347     struct sk_buff *skb;
0348     struct netlink_callback *cb;
0349     int idx;
0350 };
0351
0352 static int
0353 dsa_slave_port_fdb_do_dump(const unsigned char *addr, u16 vid,
0354                bool is_static, void *data)
0355 {
0356     struct dsa_slave_dump_ctx *dump = data;
0357     u32 portid = NETLINK_CB(dump->cb->skb).portid;
0358     u32 seq = dump->cb->nlh->nlmsg_seq;
0359     struct nlmsghdr *nlh;
0360     struct ndmsg *ndm;
0361
0362     if (dump->idx < dump->cb->args[2])
0363         goto skip;
0364
0365     nlh = nlmsg_put(dump->skb, portid, seq, RTM_NEWNEIGH,
0366             sizeof(*ndm), NLM_F_MULTI);
0367     if (!nlh)
0368         return -EMSGSIZE;
0369
0370     ndm = nlmsg_data(nlh);
0371     ndm->ndm_family  = AF_BRIDGE;
0372     ndm->ndm_pad1    = 0;
0373     ndm->ndm_pad2    = 0;
0374     ndm->ndm_flags   = NTF_SELF;
0375     ndm->ndm_type    = 0;
0376     ndm->ndm_ifindex = dump->dev->ifindex;
0377     ndm->ndm_state   = is_static ? NUD_NOARP : NUD_REACHABLE;
0378
0379     if (nla_put(dump->skb, NDA_LLADDR, ETH_ALEN, addr))
0380         goto nla_put_failure;
0381
0382     if (vid && nla_put_u16(dump->skb, NDA_VLAN, vid))
0383         goto nla_put_failure;
0384
0385     nlmsg_end(dump->skb, nlh);
0386
0387 skip:
0388     dump->idx++;
0389     return 0;
0390
0391 nla_put_failure:
0392     nlmsg_cancel(dump->skb, nlh);
0393     return -EMSGSIZE;
0394 }
0395
0396 static int
0397 dsa_slave_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
0398            struct net_device *dev, struct net_device *filter_dev,
0399            int *idx)
0400 {
0401     struct dsa_port *dp = dsa_slave_to_port(dev);
0402     struct dsa_slave_dump_ctx dump = {
0403         .dev = dev,
0404         .skb = skb,
0405         .cb = cb,
0406         .idx = *idx,
0407     };
0408     int err;
0409
0410     err = dsa_port_fdb_dump(dp, dsa_slave_port_fdb_do_dump, &dump);
0411     *idx = dump.idx;
0412
0413     return err;
0414 }
0415
0416 static int dsa_slave_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
0417 {
0418     struct dsa_slave_priv *p = netdev_priv(dev);
0419     struct dsa_switch *ds = p->dp->ds;
0420     int port = p->dp->index;
0421
0422     /* Pass through to switch driver if it supports timestamping */
0423     switch (cmd) {
0424     case SIOCGHWTSTAMP:
0425         if (ds->ops->port_hwtstamp_get)
0426             return ds->ops->port_hwtstamp_get(ds, port, ifr);
0427         break;
0428     case SIOCSHWTSTAMP:
0429         if (ds->ops->port_hwtstamp_set)
0430             return ds->ops->port_hwtstamp_set(ds, port, ifr);
0431         break;
0432     }
0433
0434     return phylink_mii_ioctl(p->dp->pl, ifr, cmd);
0435 }
0436
0437 static int dsa_slave_port_attr_set(struct net_device *dev, const void *ctx,
0438                    const struct switchdev_attr *attr,
0439                    struct netlink_ext_ack *extack)
0440 {
0441     struct dsa_port *dp = dsa_slave_to_port(dev);
0442     int ret;
0443
0444     if (ctx && ctx != dp)
0445         return 0;
0446
0447     switch (attr->id) {
0448     case SWITCHDEV_ATTR_ID_PORT_STP_STATE:
0449         if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
0450             return -EOPNOTSUPP;
0451
0452         ret = dsa_port_set_state(dp, attr->u.stp_state, true);
0453         break;
0454     case SWITCHDEV_ATTR_ID_PORT_MST_STATE:
0455         if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
0456             return -EOPNOTSUPP;
0457
0458         ret = dsa_port_set_mst_state(dp, &attr->u.mst_state, extack);
0459         break;
0460     case SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING:
0461         if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
0462             return -EOPNOTSUPP;
0463
0464         ret = dsa_port_vlan_filtering(dp, attr->u.vlan_filtering,
0465                           extack);
0466         break;
0467     case SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME:
0468         if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
0469             return -EOPNOTSUPP;
0470
0471         ret = dsa_port_ageing_time(dp, attr->u.ageing_time);
0472         break;
0473     case SWITCHDEV_ATTR_ID_BRIDGE_MST:
0474         if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
0475             return -EOPNOTSUPP;
0476
0477         ret = dsa_port_mst_enable(dp, attr->u.mst, extack);
0478         break;
0479     case SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS:
0480         if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
0481             return -EOPNOTSUPP;
0482
0483         ret = dsa_port_pre_bridge_flags(dp, attr->u.brport_flags,
0484                         extack);
0485         break;
0486     case SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS:
0487         if (!dsa_port_offloads_bridge_port(dp, attr->orig_dev))
0488             return -EOPNOTSUPP;
0489
0490         ret = dsa_port_bridge_flags(dp, attr->u.brport_flags, extack);
0491         break;
0492     case SWITCHDEV_ATTR_ID_VLAN_MSTI:
0493         if (!dsa_port_offloads_bridge_dev(dp, attr->orig_dev))
0494             return -EOPNOTSUPP;
0495
0496         ret = dsa_port_vlan_msti(dp, &attr->u.vlan_msti);
0497         break;
0498     default:
0499         ret = -EOPNOTSUPP;
0500         break;
0501     }
0502
0503     return ret;
0504 }
0505
0506 /* Must be called under rcu_read_lock() */
0507 static int
0508 dsa_slave_vlan_check_for_8021q_uppers(struct net_device *slave,
0509                       const struct switchdev_obj_port_vlan *vlan)
0510 {
0511     struct net_device *upper_dev;
0512     struct list_head *iter;
0513
0514     netdev_for_each_upper_dev_rcu(slave, upper_dev, iter) {
0515         u16 vid;
0516
0517         if (!is_vlan_dev(upper_dev))
0518             continue;
0519
0520         vid = vlan_dev_vlan_id(upper_dev);
0521         if (vid == vlan->vid)
0522             return -EBUSY;
0523     }
0524
0525     return 0;
0526 }
0527
0528 static int dsa_slave_vlan_add(struct net_device *dev,
0529                   const struct switchdev_obj *obj,
0530                   struct netlink_ext_ack *extack)
0531 {
0532     struct dsa_port *dp = dsa_slave_to_port(dev);
0533     struct switchdev_obj_port_vlan *vlan;
0534     int err;
0535
0536     if (dsa_port_skip_vlan_configuration(dp)) {
0537         NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
0538         return 0;
0539     }
0540
0541     vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
0542
0543     /* Deny adding a bridge VLAN when there is already an 802.1Q upper with
0544      * the same VID.
0545      */
0546     if (br_vlan_enabled(dsa_port_bridge_dev_get(dp))) {
0547         rcu_read_lock();
0548         err = dsa_slave_vlan_check_for_8021q_uppers(dev, vlan);
0549         rcu_read_unlock();
0550         if (err) {
0551             NL_SET_ERR_MSG_MOD(extack,
0552                        "Port already has a VLAN upper with this VID");
0553             return err;
0554         }
0555     }
0556
0557     return dsa_port_vlan_add(dp, vlan, extack);
0558 }
0559
0560 /* Offload a VLAN installed on the bridge or on a foreign interface by
0561  * installing it as a VLAN towards the CPU port.
0562  */
0563 static int dsa_slave_host_vlan_add(struct net_device *dev,
0564                    const struct switchdev_obj *obj,
0565                    struct netlink_ext_ack *extack)
0566 {
0567     struct dsa_port *dp = dsa_slave_to_port(dev);
0568     struct switchdev_obj_port_vlan vlan;
0569
0570     /* Do nothing if this is a software bridge */
0571     if (!dp->bridge)
0572         return -EOPNOTSUPP;
0573
0574     if (dsa_port_skip_vlan_configuration(dp)) {
0575         NL_SET_ERR_MSG_MOD(extack, "skipping configuration of VLAN");
0576         return 0;
0577     }
0578
0579     vlan = *SWITCHDEV_OBJ_PORT_VLAN(obj);
0580
0581     /* Even though drivers often handle CPU membership in special ways,
0582      * it doesn't make sense to program a PVID, so clear this flag.
0583      */
0584     vlan.flags &= ~BRIDGE_VLAN_INFO_PVID;
0585
0586     return dsa_port_host_vlan_add(dp, &vlan, extack);
0587 }
0588
0589 static int dsa_slave_port_obj_add(struct net_device *dev, const void *ctx,
0590                   const struct switchdev_obj *obj,
0591                   struct netlink_ext_ack *extack)
0592 {
0593     struct dsa_port *dp = dsa_slave_to_port(dev);
0594     int err;
0595
0596     if (ctx && ctx != dp)
0597         return 0;
0598
0599     switch (obj->id) {
0600     case SWITCHDEV_OBJ_ID_PORT_MDB:
0601         if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
0602             return -EOPNOTSUPP;
0603
0604         err = dsa_port_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
0605         break;
0606     case SWITCHDEV_OBJ_ID_HOST_MDB:
0607         if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
0608             return -EOPNOTSUPP;
0609
0610         err = dsa_port_bridge_host_mdb_add(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
0611         break;
0612     case SWITCHDEV_OBJ_ID_PORT_VLAN:
0613         if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
0614             err = dsa_slave_vlan_add(dev, obj, extack);
0615         else
0616             err = dsa_slave_host_vlan_add(dev, obj, extack);
0617         break;
0618     case SWITCHDEV_OBJ_ID_MRP:
0619         if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
0620             return -EOPNOTSUPP;
0621
0622         err = dsa_port_mrp_add(dp, SWITCHDEV_OBJ_MRP(obj));
0623         break;
0624     case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
0625         if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
0626             return -EOPNOTSUPP;
0627
0628         err = dsa_port_mrp_add_ring_role(dp,
0629                          SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
0630         break;
0631     default:
0632         err = -EOPNOTSUPP;
0633         break;
0634     }
0635
0636     return err;
0637 }
0638
0639 static int dsa_slave_vlan_del(struct net_device *dev,
0640                   const struct switchdev_obj *obj)
0641 {
0642     struct dsa_port *dp = dsa_slave_to_port(dev);
0643     struct switchdev_obj_port_vlan *vlan;
0644
0645     if (dsa_port_skip_vlan_configuration(dp))
0646         return 0;
0647
0648     vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
0649
0650     return dsa_port_vlan_del(dp, vlan);
0651 }
0652
0653 static int dsa_slave_host_vlan_del(struct net_device *dev,
0654                    const struct switchdev_obj *obj)
0655 {
0656     struct dsa_port *dp = dsa_slave_to_port(dev);
0657     struct switchdev_obj_port_vlan *vlan;
0658
0659     /* Do nothing if this is a software bridge */
0660     if (!dp->bridge)
0661         return -EOPNOTSUPP;
0662
0663     if (dsa_port_skip_vlan_configuration(dp))
0664         return 0;
0665
0666     vlan = SWITCHDEV_OBJ_PORT_VLAN(obj);
0667
0668     return dsa_port_host_vlan_del(dp, vlan);
0669 }
0670
0671 static int dsa_slave_port_obj_del(struct net_device *dev, const void *ctx,
0672                   const struct switchdev_obj *obj)
0673 {
0674     struct dsa_port *dp = dsa_slave_to_port(dev);
0675     int err;
0676
0677     if (ctx && ctx != dp)
0678         return 0;
0679
0680     switch (obj->id) {
0681     case SWITCHDEV_OBJ_ID_PORT_MDB:
0682         if (!dsa_port_offloads_bridge_port(dp, obj->orig_dev))
0683             return -EOPNOTSUPP;
0684
0685         err = dsa_port_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
0686         break;
0687     case SWITCHDEV_OBJ_ID_HOST_MDB:
0688         if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
0689             return -EOPNOTSUPP;
0690
0691         err = dsa_port_bridge_host_mdb_del(dp, SWITCHDEV_OBJ_PORT_MDB(obj));
0692         break;
0693     case SWITCHDEV_OBJ_ID_PORT_VLAN:
0694         if (dsa_port_offloads_bridge_port(dp, obj->orig_dev))
0695             err = dsa_slave_vlan_del(dev, obj);
0696         else
0697             err = dsa_slave_host_vlan_del(dev, obj);
0698         break;
0699     case SWITCHDEV_OBJ_ID_MRP:
0700         if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
0701             return -EOPNOTSUPP;
0702
0703         err = dsa_port_mrp_del(dp, SWITCHDEV_OBJ_MRP(obj));
0704         break;
0705     case SWITCHDEV_OBJ_ID_RING_ROLE_MRP:
0706         if (!dsa_port_offloads_bridge_dev(dp, obj->orig_dev))
0707             return -EOPNOTSUPP;
0708
0709         err = dsa_port_mrp_del_ring_role(dp,
0710                          SWITCHDEV_OBJ_RING_ROLE_MRP(obj));
0711         break;
0712     default:
0713         err = -EOPNOTSUPP;
0714         break;
0715     }
0716
0717     return err;
0718 }
0719
0720 static inline netdev_tx_t dsa_slave_netpoll_send_skb(struct net_device *dev,
0721                              struct sk_buff *skb)
0722 {
0723 #ifdef CONFIG_NET_POLL_CONTROLLER
0724     struct dsa_slave_priv *p = netdev_priv(dev);
0725
0726     return netpoll_send_skb(p->netpoll, skb);
0727 #else
0728     BUG();
0729     return NETDEV_TX_OK;
0730 #endif
0731 }
0732
0733 static void dsa_skb_tx_timestamp(struct dsa_slave_priv *p,
0734                  struct sk_buff *skb)
0735 {
0736     struct dsa_switch *ds = p->dp->ds;
0737
0738     if (!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP))
0739         return;
0740
0741     if (!ds->ops->port_txtstamp)
0742         return;
0743
0744     ds->ops->port_txtstamp(ds, p->dp->index, skb);
0745 }
0746
0747 netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev)
0748 {
0749     /* SKB for netpoll still need to be mangled with the protocol-specific
0750      * tag to be successfully transmitted
0751      */
0752     if (unlikely(netpoll_tx_running(dev)))
0753         return dsa_slave_netpoll_send_skb(dev, skb);
0754
0755     /* Queue the SKB for transmission on the parent interface, but
0756      * do not modify its EtherType
0757      */
0758     skb->dev = dsa_slave_to_master(dev);
0759     dev_queue_xmit(skb);
0760
0761     return NETDEV_TX_OK;
0762 }
0763 EXPORT_SYMBOL_GPL(dsa_enqueue_skb);
0764
0765 static int dsa_realloc_skb(struct sk_buff *skb, struct net_device *dev)
0766 {
0767     int needed_headroom = dev->needed_headroom;
0768     int needed_tailroom = dev->needed_tailroom;
0769
0770     /* For tail taggers, we need to pad short frames ourselves, to ensure
0771      * that the tail tag does not fail at its role of being at the end of
0772      * the packet, once the master interface pads the frame. Account for
0773      * that pad length here, and pad later.
0774      */
0775     if (unlikely(needed_tailroom && skb->len < ETH_ZLEN))
0776         needed_tailroom += ETH_ZLEN - skb->len;
0777     /* skb_headroom() returns unsigned int... */
0778     needed_headroom = max_t(int, needed_headroom - skb_headroom(skb), 0);
0779     needed_tailroom = max_t(int, needed_tailroom - skb_tailroom(skb), 0);
0780
0781     if (likely(!needed_headroom && !needed_tailroom && !skb_cloned(skb)))
0782         /* No reallocation needed, yay! */
0783         return 0;
0784
0785     return pskb_expand_head(skb, needed_headroom, needed_tailroom,
0786                 GFP_ATOMIC);
0787 }
0788
0789 static netdev_tx_t dsa_slave_xmit(struct sk_buff *skb, struct net_device *dev)
0790 {
0791     struct dsa_slave_priv *p = netdev_priv(dev);
0792     struct sk_buff *nskb;
0793
0794     dev_sw_netstats_tx_add(dev, 1, skb->len);
0795
0796     memset(skb->cb, 0, sizeof(skb->cb));
0797
0798     /* Handle tx timestamp if any */
0799     dsa_skb_tx_timestamp(p, skb);
0800
0801     if (dsa_realloc_skb(skb, dev)) {
0802         dev_kfree_skb_any(skb);
0803         return NETDEV_TX_OK;
0804     }
0805
0806     /* needed_tailroom should still be 'warm' in the cache line from
0807      * dsa_realloc_skb(), which has also ensured that padding is safe.
0808      */
0809     if (dev->needed_tailroom)
0810         eth_skb_pad(skb);
0811
0812     /* Transmit function may have to reallocate the original SKB,
0813      * in which case it must have freed it. Only free it here on error.
0814      */
0815     nskb = p->xmit(skb, dev);
0816     if (!nskb) {
0817         kfree_skb(skb);
0818         return NETDEV_TX_OK;
0819     }
0820
0821     return dsa_enqueue_skb(nskb, dev);
0822 }
0823
0824 /* ethtool operations *******************************************************/
0825
0826 static void dsa_slave_get_drvinfo(struct net_device *dev,
0827                   struct ethtool_drvinfo *drvinfo)
0828 {
0829     strlcpy(drvinfo->driver, "dsa", sizeof(drvinfo->driver));
0830     strlcpy(drvinfo->fw_version, "N/A", sizeof(drvinfo->fw_version));
0831     strlcpy(drvinfo->bus_info, "platform", sizeof(drvinfo->bus_info));
0832 }
0833
0834 static int dsa_slave_get_regs_len(struct net_device *dev)
0835 {
0836     struct dsa_port *dp = dsa_slave_to_port(dev);
0837     struct dsa_switch *ds = dp->ds;
0838
0839     if (ds->ops->get_regs_len)
0840         return ds->ops->get_regs_len(ds, dp->index);
0841
0842     return -EOPNOTSUPP;
0843 }
0844
0845 static void
0846 dsa_slave_get_regs(struct net_device *dev, struct ethtool_regs *regs, void *_p)
0847 {
0848     struct dsa_port *dp = dsa_slave_to_port(dev);
0849     struct dsa_switch *ds = dp->ds;
0850
0851     if (ds->ops->get_regs)
0852         ds->ops->get_regs(ds, dp->index, regs, _p);
0853 }
0854
0855 static int dsa_slave_nway_reset(struct net_device *dev)
0856 {
0857     struct dsa_port *dp = dsa_slave_to_port(dev);
0858
0859     return phylink_ethtool_nway_reset(dp->pl);
0860 }
0861
0862 static int dsa_slave_get_eeprom_len(struct net_device *dev)
0863 {
0864     struct dsa_port *dp = dsa_slave_to_port(dev);
0865     struct dsa_switch *ds = dp->ds;
0866
0867     if (ds->cd && ds->cd->eeprom_len)
0868         return ds->cd->eeprom_len;
0869
0870     if (ds->ops->get_eeprom_len)
0871         return ds->ops->get_eeprom_len(ds);
0872
0873     return 0;
0874 }
0875
0876 static int dsa_slave_get_eeprom(struct net_device *dev,
0877                 struct ethtool_eeprom *eeprom, u8 *data)
0878 {
0879     struct dsa_port *dp = dsa_slave_to_port(dev);
0880     struct dsa_switch *ds = dp->ds;
0881
0882     if (ds->ops->get_eeprom)
0883         return ds->ops->get_eeprom(ds, eeprom, data);
0884
0885     return -EOPNOTSUPP;
0886 }
0887
0888 static int dsa_slave_set_eeprom(struct net_device *dev,
0889                 struct ethtool_eeprom *eeprom, u8 *data)
0890 {
0891     struct dsa_port *dp = dsa_slave_to_port(dev);
0892     struct dsa_switch *ds = dp->ds;
0893
0894     if (ds->ops->set_eeprom)
0895         return ds->ops->set_eeprom(ds, eeprom, data);
0896
0897     return -EOPNOTSUPP;
0898 }
0899
0900 static void dsa_slave_get_strings(struct net_device *dev,
0901                   uint32_t stringset, uint8_t *data)
0902 {
0903     struct dsa_port *dp = dsa_slave_to_port(dev);
0904     struct dsa_switch *ds = dp->ds;
0905
0906     if (stringset == ETH_SS_STATS) {
0907         int len = ETH_GSTRING_LEN;
0908
0909         strncpy(data, "tx_packets", len);
0910         strncpy(data + len, "tx_bytes", len);
0911         strncpy(data + 2 * len, "rx_packets", len);
0912         strncpy(data + 3 * len, "rx_bytes", len);
0913         if (ds->ops->get_strings)
0914             ds->ops->get_strings(ds, dp->index, stringset,
0915                          data + 4 * len);
0916     } else if (stringset ==  ETH_SS_TEST) {
0917         net_selftest_get_strings(data);
0918     }
0919
0920 }
0921
0922 static void dsa_slave_get_ethtool_stats(struct net_device *dev,
0923                     struct ethtool_stats *stats,
0924                     uint64_t *data)
0925 {
0926     struct dsa_port *dp = dsa_slave_to_port(dev);
0927     struct dsa_switch *ds = dp->ds;
0928     struct pcpu_sw_netstats *s;
0929     unsigned int start;
0930     int i;
0931
0932     for_each_possible_cpu(i) {
0933         u64 tx_packets, tx_bytes, rx_packets, rx_bytes;
0934
0935         s = per_cpu_ptr(dev->tstats, i);
0936         do {
0937             start = u64_stats_fetch_begin_irq(&s->syncp);
0938             tx_packets = u64_stats_read(&s->tx_packets);
0939             tx_bytes = u64_stats_read(&s->tx_bytes);
0940             rx_packets = u64_stats_read(&s->rx_packets);
0941             rx_bytes = u64_stats_read(&s->rx_bytes);
0942         } while (u64_stats_fetch_retry_irq(&s->syncp, start));
0943         data[0] += tx_packets;
0944         data[1] += tx_bytes;
0945         data[2] += rx_packets;
0946         data[3] += rx_bytes;
0947     }
0948     if (ds->ops->get_ethtool_stats)
0949         ds->ops->get_ethtool_stats(ds, dp->index, data + 4);
0950 }
0951
0952 static int dsa_slave_get_sset_count(struct net_device *dev, int sset)
0953 {
0954     struct dsa_port *dp = dsa_slave_to_port(dev);
0955     struct dsa_switch *ds = dp->ds;
0956
0957     if (sset == ETH_SS_STATS) {
0958         int count = 0;
0959
0960         if (ds->ops->get_sset_count) {
0961             count = ds->ops->get_sset_count(ds, dp->index, sset);
0962             if (count < 0)
0963                 return count;
0964         }
0965
0966         return count + 4;
0967     } else if (sset ==  ETH_SS_TEST) {
0968         return net_selftest_get_count();
0969     }
0970
0971     return -EOPNOTSUPP;
0972 }
0973
0974 static void dsa_slave_get_eth_phy_stats(struct net_device *dev,
0975                     struct ethtool_eth_phy_stats *phy_stats)
0976 {
0977     struct dsa_port *dp = dsa_slave_to_port(dev);
0978     struct dsa_switch *ds = dp->ds;
0979
0980     if (ds->ops->get_eth_phy_stats)
0981         ds->ops->get_eth_phy_stats(ds, dp->index, phy_stats);
0982 }
0983
0984 static void dsa_slave_get_eth_mac_stats(struct net_device *dev,
0985                     struct ethtool_eth_mac_stats *mac_stats)
0986 {
0987     struct dsa_port *dp = dsa_slave_to_port(dev);
0988     struct dsa_switch *ds = dp->ds;
0989
0990     if (ds->ops->get_eth_mac_stats)
0991         ds->ops->get_eth_mac_stats(ds, dp->index, mac_stats);
0992 }
0993
0994 static void
0995 dsa_slave_get_eth_ctrl_stats(struct net_device *dev,
0996                  struct ethtool_eth_ctrl_stats *ctrl_stats)
0997 {
0998     struct dsa_port *dp = dsa_slave_to_port(dev);
0999     struct dsa_switch *ds = dp->ds;
1000
1001     if (ds->ops->get_eth_ctrl_stats)
1002         ds->ops->get_eth_ctrl_stats(ds, dp->index, ctrl_stats);
1003 }
1004
1005 static void
1006 dsa_slave_get_rmon_stats(struct net_device *dev,
1007              struct ethtool_rmon_stats *rmon_stats,
1008              const struct ethtool_rmon_hist_range **ranges)
1009 {
1010     struct dsa_port *dp = dsa_slave_to_port(dev);
1011     struct dsa_switch *ds = dp->ds;
1012
1013     if (ds->ops->get_rmon_stats)
1014         ds->ops->get_rmon_stats(ds, dp->index, rmon_stats, ranges);
1015 }
1016
1017 static void dsa_slave_net_selftest(struct net_device *ndev,
1018                    struct ethtool_test *etest, u64 *buf)
1019 {
1020     struct dsa_port *dp = dsa_slave_to_port(ndev);
1021     struct dsa_switch *ds = dp->ds;
1022
1023     if (ds->ops->self_test) {
1024         ds->ops->self_test(ds, dp->index, etest, buf);
1025         return;
1026     }
1027
1028     net_selftest(ndev, etest, buf);
1029 }
1030
1031 static void dsa_slave_get_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1032 {
1033     struct dsa_port *dp = dsa_slave_to_port(dev);
1034     struct dsa_switch *ds = dp->ds;
1035
1036     phylink_ethtool_get_wol(dp->pl, w);
1037
1038     if (ds->ops->get_wol)
1039         ds->ops->get_wol(ds, dp->index, w);
1040 }
1041
1042 static int dsa_slave_set_wol(struct net_device *dev, struct ethtool_wolinfo *w)
1043 {
1044     struct dsa_port *dp = dsa_slave_to_port(dev);
1045     struct dsa_switch *ds = dp->ds;
1046     int ret = -EOPNOTSUPP;
1047
1048     phylink_ethtool_set_wol(dp->pl, w);
1049
1050     if (ds->ops->set_wol)
1051         ret = ds->ops->set_wol(ds, dp->index, w);
1052
1053     return ret;
1054 }
1055
1056 static int dsa_slave_set_eee(struct net_device *dev, struct ethtool_eee *e)
1057 {
1058     struct dsa_port *dp = dsa_slave_to_port(dev);
1059     struct dsa_switch *ds = dp->ds;
1060     int ret;
1061
1062     /* Port's PHY and MAC both need to be EEE capable */
1063     if (!dev->phydev || !dp->pl)
1064         return -ENODEV;
1065
1066     if (!ds->ops->set_mac_eee)
1067         return -EOPNOTSUPP;
1068
1069     ret = ds->ops->set_mac_eee(ds, dp->index, e);
1070     if (ret)
1071         return ret;
1072
1073     return phylink_ethtool_set_eee(dp->pl, e);
1074 }
1075
1076 static int dsa_slave_get_eee(struct net_device *dev, struct ethtool_eee *e)
1077 {
1078     struct dsa_port *dp = dsa_slave_to_port(dev);
1079     struct dsa_switch *ds = dp->ds;
1080     int ret;
1081
1082     /* Port's PHY and MAC both need to be EEE capable */
1083     if (!dev->phydev || !dp->pl)
1084         return -ENODEV;
1085
1086     if (!ds->ops->get_mac_eee)
1087         return -EOPNOTSUPP;
1088
1089     ret = ds->ops->get_mac_eee(ds, dp->index, e);
1090     if (ret)
1091         return ret;
1092
1093     return phylink_ethtool_get_eee(dp->pl, e);
1094 }
1095
1096 static int dsa_slave_get_link_ksettings(struct net_device *dev,
1097                     struct ethtool_link_ksettings *cmd)
1098 {
1099     struct dsa_port *dp = dsa_slave_to_port(dev);
1100
1101     return phylink_ethtool_ksettings_get(dp->pl, cmd);
1102 }
1103
1104 static int dsa_slave_set_link_ksettings(struct net_device *dev,
1105                     const struct ethtool_link_ksettings *cmd)
1106 {
1107     struct dsa_port *dp = dsa_slave_to_port(dev);
1108
1109     return phylink_ethtool_ksettings_set(dp->pl, cmd);
1110 }
1111
1112 static void dsa_slave_get_pause_stats(struct net_device *dev,
1113                   struct ethtool_pause_stats *pause_stats)
1114 {
1115     struct dsa_port *dp = dsa_slave_to_port(dev);
1116     struct dsa_switch *ds = dp->ds;
1117
1118     if (ds->ops->get_pause_stats)
1119         ds->ops->get_pause_stats(ds, dp->index, pause_stats);
1120 }
1121
1122 static void dsa_slave_get_pauseparam(struct net_device *dev,
1123                      struct ethtool_pauseparam *pause)
1124 {
1125     struct dsa_port *dp = dsa_slave_to_port(dev);
1126
1127     phylink_ethtool_get_pauseparam(dp->pl, pause);
1128 }
1129
1130 static int dsa_slave_set_pauseparam(struct net_device *dev,
1131                     struct ethtool_pauseparam *pause)
1132 {
1133     struct dsa_port *dp = dsa_slave_to_port(dev);
1134
1135     return phylink_ethtool_set_pauseparam(dp->pl, pause);
1136 }
1137
1138 #ifdef CONFIG_NET_POLL_CONTROLLER
1139 static int dsa_slave_netpoll_setup(struct net_device *dev,
1140                    struct netpoll_info *ni)
1141 {
1142     struct net_device *master = dsa_slave_to_master(dev);
1143     struct dsa_slave_priv *p = netdev_priv(dev);
1144     struct netpoll *netpoll;
1145     int err = 0;
1146
1147     netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1148     if (!netpoll)
1149         return -ENOMEM;
1150
1151     err = __netpoll_setup(netpoll, master);
1152     if (err) {
1153         kfree(netpoll);
1154         goto out;
1155     }
1156
1157     p->netpoll = netpoll;
1158 out:
1159     return err;
1160 }
1161
1162 static void dsa_slave_netpoll_cleanup(struct net_device *dev)
1163 {
1164     struct dsa_slave_priv *p = netdev_priv(dev);
1165     struct netpoll *netpoll = p->netpoll;
1166
1167     if (!netpoll)
1168         return;
1169
1170     p->netpoll = NULL;
1171
1172     __netpoll_free(netpoll);
1173 }
1174
1175 static void dsa_slave_poll_controller(struct net_device *dev)
1176 {
1177 }
1178 #endif
1179
1180 static struct dsa_mall_tc_entry *
1181 dsa_slave_mall_tc_entry_find(struct net_device *dev, unsigned long cookie)
1182 {
1183     struct dsa_slave_priv *p = netdev_priv(dev);
1184     struct dsa_mall_tc_entry *mall_tc_entry;
1185
1186     list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list)
1187         if (mall_tc_entry->cookie == cookie)
1188             return mall_tc_entry;
1189
1190     return NULL;
1191 }
1192
1193 static int
1194 dsa_slave_add_cls_matchall_mirred(struct net_device *dev,
1195                   struct tc_cls_matchall_offload *cls,
1196                   bool ingress)
1197 {
1198     struct netlink_ext_ack *extack = cls->common.extack;
1199     struct dsa_port *dp = dsa_slave_to_port(dev);
1200     struct dsa_slave_priv *p = netdev_priv(dev);
1201     struct dsa_mall_mirror_tc_entry *mirror;
1202     struct dsa_mall_tc_entry *mall_tc_entry;
1203     struct dsa_switch *ds = dp->ds;
1204     struct flow_action_entry *act;
1205     struct dsa_port *to_dp;
1206     int err;
1207
1208     if (!ds->ops->port_mirror_add)
1209         return -EOPNOTSUPP;
1210
1211     if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1212                           cls->common.extack))
1213         return -EOPNOTSUPP;
1214
1215     act = &cls->rule->action.entries[0];
1216
1217     if (!act->dev)
1218         return -EINVAL;
1219
1220     if (!dsa_slave_dev_check(act->dev))
1221         return -EOPNOTSUPP;
1222
1223     mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1224     if (!mall_tc_entry)
1225         return -ENOMEM;
1226
1227     mall_tc_entry->cookie = cls->cookie;
1228     mall_tc_entry->type = DSA_PORT_MALL_MIRROR;
1229     mirror = &mall_tc_entry->mirror;
1230
1231     to_dp = dsa_slave_to_port(act->dev);
1232
1233     mirror->to_local_port = to_dp->index;
1234     mirror->ingress = ingress;
1235
1236     err = ds->ops->port_mirror_add(ds, dp->index, mirror, ingress, extack);
1237     if (err) {
1238         kfree(mall_tc_entry);
1239         return err;
1240     }
1241
1242     list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1243
1244     return err;
1245 }
1246
1247 static int
1248 dsa_slave_add_cls_matchall_police(struct net_device *dev,
1249                   struct tc_cls_matchall_offload *cls,
1250                   bool ingress)
1251 {
1252     struct netlink_ext_ack *extack = cls->common.extack;
1253     struct dsa_port *dp = dsa_slave_to_port(dev);
1254     struct dsa_slave_priv *p = netdev_priv(dev);
1255     struct dsa_mall_policer_tc_entry *policer;
1256     struct dsa_mall_tc_entry *mall_tc_entry;
1257     struct dsa_switch *ds = dp->ds;
1258     struct flow_action_entry *act;
1259     int err;
1260
1261     if (!ds->ops->port_policer_add) {
1262         NL_SET_ERR_MSG_MOD(extack,
1263                    "Policing offload not implemented");
1264         return -EOPNOTSUPP;
1265     }
1266
1267     if (!ingress) {
1268         NL_SET_ERR_MSG_MOD(extack,
1269                    "Only supported on ingress qdisc");
1270         return -EOPNOTSUPP;
1271     }
1272
1273     if (!flow_action_basic_hw_stats_check(&cls->rule->action,
1274                           cls->common.extack))
1275         return -EOPNOTSUPP;
1276
1277     list_for_each_entry(mall_tc_entry, &p->mall_tc_list, list) {
1278         if (mall_tc_entry->type == DSA_PORT_MALL_POLICER) {
1279             NL_SET_ERR_MSG_MOD(extack,
1280                        "Only one port policer allowed");
1281             return -EEXIST;
1282         }
1283     }
1284
1285     act = &cls->rule->action.entries[0];
1286
1287     mall_tc_entry = kzalloc(sizeof(*mall_tc_entry), GFP_KERNEL);
1288     if (!mall_tc_entry)
1289         return -ENOMEM;
1290
1291     mall_tc_entry->cookie = cls->cookie;
1292     mall_tc_entry->type = DSA_PORT_MALL_POLICER;
1293     policer = &mall_tc_entry->policer;
1294     policer->rate_bytes_per_sec = act->police.rate_bytes_ps;
1295     policer->burst = act->police.burst;
1296
1297     err = ds->ops->port_policer_add(ds, dp->index, policer);
1298     if (err) {
1299         kfree(mall_tc_entry);
1300         return err;
1301     }
1302
1303     list_add_tail(&mall_tc_entry->list, &p->mall_tc_list);
1304
1305     return err;
1306 }
1307
1308 static int dsa_slave_add_cls_matchall(struct net_device *dev,
1309                       struct tc_cls_matchall_offload *cls,
1310                       bool ingress)
1311 {
1312     int err = -EOPNOTSUPP;
1313
1314     if (cls->common.protocol == htons(ETH_P_ALL) &&
1315         flow_offload_has_one_action(&cls->rule->action) &&
1316         cls->rule->action.entries[0].id == FLOW_ACTION_MIRRED)
1317         err = dsa_slave_add_cls_matchall_mirred(dev, cls, ingress);
1318     else if (flow_offload_has_one_action(&cls->rule->action) &&
1319          cls->rule->action.entries[0].id == FLOW_ACTION_POLICE)
1320         err = dsa_slave_add_cls_matchall_police(dev, cls, ingress);
1321
1322     return err;
1323 }
1324
1325 static void dsa_slave_del_cls_matchall(struct net_device *dev,
1326                        struct tc_cls_matchall_offload *cls)
1327 {
1328     struct dsa_port *dp = dsa_slave_to_port(dev);
1329     struct dsa_mall_tc_entry *mall_tc_entry;
1330     struct dsa_switch *ds = dp->ds;
1331
1332     mall_tc_entry = dsa_slave_mall_tc_entry_find(dev, cls->cookie);
1333     if (!mall_tc_entry)
1334         return;
1335
1336     list_del(&mall_tc_entry->list);
1337
1338     switch (mall_tc_entry->type) {
1339     case DSA_PORT_MALL_MIRROR:
1340         if (ds->ops->port_mirror_del)
1341             ds->ops->port_mirror_del(ds, dp->index,
1342                          &mall_tc_entry->mirror);
1343         break;
1344     case DSA_PORT_MALL_POLICER:
1345         if (ds->ops->port_policer_del)
1346             ds->ops->port_policer_del(ds, dp->index);
1347         break;
1348     default:
1349         WARN_ON(1);
1350     }
1351
1352     kfree(mall_tc_entry);
1353 }
1354
1355 static int dsa_slave_setup_tc_cls_matchall(struct net_device *dev,
1356                        struct tc_cls_matchall_offload *cls,
1357                        bool ingress)
1358 {
1359     if (cls->common.chain_index)
1360         return -EOPNOTSUPP;
1361
1362     switch (cls->command) {
1363     case TC_CLSMATCHALL_REPLACE:
1364         return dsa_slave_add_cls_matchall(dev, cls, ingress);
1365     case TC_CLSMATCHALL_DESTROY:
1366         dsa_slave_del_cls_matchall(dev, cls);
1367         return 0;
1368     default:
1369         return -EOPNOTSUPP;
1370     }
1371 }
1372
1373 static int dsa_slave_add_cls_flower(struct net_device *dev,
1374                     struct flow_cls_offload *cls,
1375                     bool ingress)
1376 {
1377     struct dsa_port *dp = dsa_slave_to_port(dev);
1378     struct dsa_switch *ds = dp->ds;
1379     int port = dp->index;
1380
1381     if (!ds->ops->cls_flower_add)
1382         return -EOPNOTSUPP;
1383
1384     return ds->ops->cls_flower_add(ds, port, cls, ingress);
1385 }
1386
1387 static int dsa_slave_del_cls_flower(struct net_device *dev,
1388                     struct flow_cls_offload *cls,
1389                     bool ingress)
1390 {
1391     struct dsa_port *dp = dsa_slave_to_port(dev);
1392     struct dsa_switch *ds = dp->ds;
1393     int port = dp->index;
1394
1395     if (!ds->ops->cls_flower_del)
1396         return -EOPNOTSUPP;
1397
1398     return ds->ops->cls_flower_del(ds, port, cls, ingress);
1399 }
1400
1401 static int dsa_slave_stats_cls_flower(struct net_device *dev,
1402                       struct flow_cls_offload *cls,
1403                       bool ingress)
1404 {
1405     struct dsa_port *dp = dsa_slave_to_port(dev);
1406     struct dsa_switch *ds = dp->ds;
1407     int port = dp->index;
1408
1409     if (!ds->ops->cls_flower_stats)
1410         return -EOPNOTSUPP;
1411
1412     return ds->ops->cls_flower_stats(ds, port, cls, ingress);
1413 }
1414
1415 static int dsa_slave_setup_tc_cls_flower(struct net_device *dev,
1416                      struct flow_cls_offload *cls,
1417                      bool ingress)
1418 {
1419     switch (cls->command) {
1420     case FLOW_CLS_REPLACE:
1421         return dsa_slave_add_cls_flower(dev, cls, ingress);
1422     case FLOW_CLS_DESTROY:
1423         return dsa_slave_del_cls_flower(dev, cls, ingress);
1424     case FLOW_CLS_STATS:
1425         return dsa_slave_stats_cls_flower(dev, cls, ingress);
1426     default:
1427         return -EOPNOTSUPP;
1428     }
1429 }
1430
1431 static int dsa_slave_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
1432                        void *cb_priv, bool ingress)
1433 {
1434     struct net_device *dev = cb_priv;
1435
1436     if (!tc_can_offload(dev))
1437         return -EOPNOTSUPP;
1438
1439     switch (type) {
1440     case TC_SETUP_CLSMATCHALL:
1441         return dsa_slave_setup_tc_cls_matchall(dev, type_data, ingress);
1442     case TC_SETUP_CLSFLOWER:
1443         return dsa_slave_setup_tc_cls_flower(dev, type_data, ingress);
1444     default:
1445         return -EOPNOTSUPP;
1446     }
1447 }
1448
1449 static int dsa_slave_setup_tc_block_cb_ig(enum tc_setup_type type,
1450                       void *type_data, void *cb_priv)
1451 {
1452     return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, true);
1453 }
1454
1455 static int dsa_slave_setup_tc_block_cb_eg(enum tc_setup_type type,
1456                       void *type_data, void *cb_priv)
1457 {
1458     return dsa_slave_setup_tc_block_cb(type, type_data, cb_priv, false);
1459 }
1460
1461 static LIST_HEAD(dsa_slave_block_cb_list);
1462
1463 static int dsa_slave_setup_tc_block(struct net_device *dev,
1464                     struct flow_block_offload *f)
1465 {
1466     struct flow_block_cb *block_cb;
1467     flow_setup_cb_t *cb;
1468
1469     if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS)
1470         cb = dsa_slave_setup_tc_block_cb_ig;
1471     else if (f->binder_type == FLOW_BLOCK_BINDER_TYPE_CLSACT_EGRESS)
1472         cb = dsa_slave_setup_tc_block_cb_eg;
1473     else
1474         return -EOPNOTSUPP;
1475
1476     f->driver_block_list = &dsa_slave_block_cb_list;
1477
1478     switch (f->command) {
1479     case FLOW_BLOCK_BIND:
1480         if (flow_block_cb_is_busy(cb, dev, &dsa_slave_block_cb_list))
1481             return -EBUSY;
1482
1483         block_cb = flow_block_cb_alloc(cb, dev, dev, NULL);
1484         if (IS_ERR(block_cb))
1485             return PTR_ERR(block_cb);
1486
1487         flow_block_cb_add(block_cb, f);
1488         list_add_tail(&block_cb->driver_list, &dsa_slave_block_cb_list);
1489         return 0;
1490     case FLOW_BLOCK_UNBIND:
1491         block_cb = flow_block_cb_lookup(f->block, cb, dev);
1492         if (!block_cb)
1493             return -ENOENT;
1494
1495         flow_block_cb_remove(block_cb, f);
1496         list_del(&block_cb->driver_list);
1497         return 0;
1498     default:
1499         return -EOPNOTSUPP;
1500     }
1501 }
1502
1503 static int dsa_slave_setup_ft_block(struct dsa_switch *ds, int port,
1504                     void *type_data)
1505 {
1506     struct dsa_port *cpu_dp = dsa_to_port(ds, port)->cpu_dp;
1507     struct net_device *master = cpu_dp->master;
1508
1509     if (!master->netdev_ops->ndo_setup_tc)
1510         return -EOPNOTSUPP;
1511
1512     return master->netdev_ops->ndo_setup_tc(master, TC_SETUP_FT, type_data);
1513 }
1514
1515 static int dsa_slave_setup_tc(struct net_device *dev, enum tc_setup_type type,
1516                   void *type_data)
1517 {
1518     struct dsa_port *dp = dsa_slave_to_port(dev);
1519     struct dsa_switch *ds = dp->ds;
1520
1521     switch (type) {
1522     case TC_SETUP_BLOCK:
1523         return dsa_slave_setup_tc_block(dev, type_data);
1524     case TC_SETUP_FT:
1525         return dsa_slave_setup_ft_block(ds, dp->index, type_data);
1526     default:
1527         break;
1528     }
1529
1530     if (!ds->ops->port_setup_tc)
1531         return -EOPNOTSUPP;
1532
1533     return ds->ops->port_setup_tc(ds, dp->index, type, type_data);
1534 }
1535
1536 static int dsa_slave_get_rxnfc(struct net_device *dev,
1537                    struct ethtool_rxnfc *nfc, u32 *rule_locs)
1538 {
1539     struct dsa_port *dp = dsa_slave_to_port(dev);
1540     struct dsa_switch *ds = dp->ds;
1541
1542     if (!ds->ops->get_rxnfc)
1543         return -EOPNOTSUPP;
1544
1545     return ds->ops->get_rxnfc(ds, dp->index, nfc, rule_locs);
1546 }
1547
1548 static int dsa_slave_set_rxnfc(struct net_device *dev,
1549                    struct ethtool_rxnfc *nfc)
1550 {
1551     struct dsa_port *dp = dsa_slave_to_port(dev);
1552     struct dsa_switch *ds = dp->ds;
1553
1554     if (!ds->ops->set_rxnfc)
1555         return -EOPNOTSUPP;
1556
1557     return ds->ops->set_rxnfc(ds, dp->index, nfc);
1558 }
1559
1560 static int dsa_slave_get_ts_info(struct net_device *dev,
1561                  struct ethtool_ts_info *ts)
1562 {
1563     struct dsa_slave_priv *p = netdev_priv(dev);
1564     struct dsa_switch *ds = p->dp->ds;
1565
1566     if (!ds->ops->get_ts_info)
1567         return -EOPNOTSUPP;
1568
1569     return ds->ops->get_ts_info(ds, p->dp->index, ts);
1570 }
1571
1572 static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
1573                      u16 vid)
1574 {
1575     struct dsa_port *dp = dsa_slave_to_port(dev);
1576     struct switchdev_obj_port_vlan vlan = {
1577         .obj.id = SWITCHDEV_OBJ_ID_PORT_VLAN,
1578         .vid = vid,
1579         /* This API only allows programming tagged, non-PVID VIDs */
1580         .flags = 0,
1581     };
1582     struct netlink_ext_ack extack = {0};
1583     int ret;
1584
1585     /* User port... */
1586     ret = dsa_port_vlan_add(dp, &vlan, &extack);
1587     if (ret) {
1588         if (extack._msg)
1589             netdev_err(dev, "%s\n", extack._msg);
1590         return ret;
1591     }
1592
1593     /* And CPU port... */
1594     ret = dsa_port_host_vlan_add(dp, &vlan, &extack);
1595     if (ret) {
1596         if (extack._msg)
1597             netdev_err(dev, "CPU port %d: %s\n", dp->cpu_dp->index,
1598                    extack._msg);
1599         return ret;
1600     }
1601
1602     return 0;
1603 }
1604
1605 static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
1606                       u16 vid)
1607 {
1608     struct dsa_port *dp = dsa_slave_to_port(dev);
1609     struct switchdev_obj_port_vlan vlan = {
1610         .vid = vid,
1611         /* This API only allows programming tagged, non-PVID VIDs */
1612         .flags = 0,
1613     };
1614     int err;
1615
1616     err = dsa_port_vlan_del(dp, &vlan);
1617     if (err)
1618         return err;
1619
1620     return dsa_port_host_vlan_del(dp, &vlan);
1621 }
1622
1623 static int dsa_slave_restore_vlan(struct net_device *vdev, int vid, void *arg)
1624 {
1625     __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1626
1627     return dsa_slave_vlan_rx_add_vid(arg, proto, vid);
1628 }
1629
1630 static int dsa_slave_clear_vlan(struct net_device *vdev, int vid, void *arg)
1631 {
1632     __be16 proto = vdev ? vlan_dev_vlan_proto(vdev) : htons(ETH_P_8021Q);
1633
1634     return dsa_slave_vlan_rx_kill_vid(arg, proto, vid);
1635 }
1636
1637 /* Keep the VLAN RX filtering list in sync with the hardware only if VLAN
1638  * filtering is enabled. The baseline is that only ports that offload a
1639  * VLAN-aware bridge are VLAN-aware, and standalone ports are VLAN-unaware,
1640  * but there are exceptions for quirky hardware.
1641  *
1642  * If ds->vlan_filtering_is_global = true, then standalone ports which share
1643  * the same switch with other ports that offload a VLAN-aware bridge are also
1644  * inevitably VLAN-aware.
1645  *
1646  * To summarize, a DSA switch port offloads:
1647  *
1648  * - If standalone (this includes software bridge, software LAG):
1649  *     - if ds->needs_standalone_vlan_filtering = true, OR if
1650  *       (ds->vlan_filtering_is_global = true AND there are bridges spanning
1651  *       this switch chip which have vlan_filtering=1)
1652  *         - the 8021q upper VLANs
1653  *     - else (standalone VLAN filtering is not needed, VLAN filtering is not
1654  *       global, or it is, but no port is under a VLAN-aware bridge):
1655  *         - no VLAN (any 8021q upper is a software VLAN)
1656  *
1657  * - If under a vlan_filtering=0 bridge which it offload:
1658  *     - if ds->configure_vlan_while_not_filtering = true (default):
1659  *         - the bridge VLANs. These VLANs are committed to hardware but inactive.
1660  *     - else (deprecated):
1661  *         - no VLAN. The bridge VLANs are not restored when VLAN awareness is
1662  *           enabled, so this behavior is broken and discouraged.
1663  *
1664  * - If under a vlan_filtering=1 bridge which it offload:
1665  *     - the bridge VLANs
1666  *     - the 8021q upper VLANs
1667  */
1668 int dsa_slave_manage_vlan_filtering(struct net_device *slave,
1669                     bool vlan_filtering)
1670 {
1671     int err;
1672
1673     if (vlan_filtering) {
1674         slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1675
1676         err = vlan_for_each(slave, dsa_slave_restore_vlan, slave);
1677         if (err) {
1678             vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1679             slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1680             return err;
1681         }
1682     } else {
1683         err = vlan_for_each(slave, dsa_slave_clear_vlan, slave);
1684         if (err)
1685             return err;
1686
1687         slave->features &= ~NETIF_F_HW_VLAN_CTAG_FILTER;
1688     }
1689
1690     return 0;
1691 }
1692
1693 struct dsa_hw_port {
1694     struct list_head list;
1695     struct net_device *dev;
1696     int old_mtu;
1697 };
1698
1699 static int dsa_hw_port_list_set_mtu(struct list_head *hw_port_list, int mtu)
1700 {
1701     const struct dsa_hw_port *p;
1702     int err;
1703
1704     list_for_each_entry(p, hw_port_list, list) {
1705         if (p->dev->mtu == mtu)
1706             continue;
1707
1708         err = dev_set_mtu(p->dev, mtu);
1709         if (err)
1710             goto rollback;
1711     }
1712
1713     return 0;
1714
1715 rollback:
1716     list_for_each_entry_continue_reverse(p, hw_port_list, list) {
1717         if (p->dev->mtu == p->old_mtu)
1718             continue;
1719
1720         if (dev_set_mtu(p->dev, p->old_mtu))
1721             netdev_err(p->dev, "Failed to restore MTU\n");
1722     }
1723
1724     return err;
1725 }
1726
1727 static void dsa_hw_port_list_free(struct list_head *hw_port_list)
1728 {
1729     struct dsa_hw_port *p, *n;
1730
1731     list_for_each_entry_safe(p, n, hw_port_list, list)
1732         kfree(p);
1733 }
1734
1735 /* Make the hardware datapath to/from @dev limited to a common MTU */
1736 static void dsa_bridge_mtu_normalization(struct dsa_port *dp)
1737 {
1738     struct list_head hw_port_list;
1739     struct dsa_switch_tree *dst;
1740     int min_mtu = ETH_MAX_MTU;
1741     struct dsa_port *other_dp;
1742     int err;
1743
1744     if (!dp->ds->mtu_enforcement_ingress)
1745         return;
1746
1747     if (!dp->bridge)
1748         return;
1749
1750     INIT_LIST_HEAD(&hw_port_list);
1751
1752     /* Populate the list of ports that are part of the same bridge
1753      * as the newly added/modified port
1754      */
1755     list_for_each_entry(dst, &dsa_tree_list, list) {
1756         list_for_each_entry(other_dp, &dst->ports, list) {
1757             struct dsa_hw_port *hw_port;
1758             struct net_device *slave;
1759
1760             if (other_dp->type != DSA_PORT_TYPE_USER)
1761                 continue;
1762
1763             if (!dsa_port_bridge_same(dp, other_dp))
1764                 continue;
1765
1766             if (!other_dp->ds->mtu_enforcement_ingress)
1767                 continue;
1768
1769             slave = other_dp->slave;
1770
1771             if (min_mtu > slave->mtu)
1772                 min_mtu = slave->mtu;
1773
1774             hw_port = kzalloc(sizeof(*hw_port), GFP_KERNEL);
1775             if (!hw_port)
1776                 goto out;
1777
1778             hw_port->dev = slave;
1779             hw_port->old_mtu = slave->mtu;
1780
1781             list_add(&hw_port->list, &hw_port_list);
1782         }
1783     }
1784
1785     /* Attempt to configure the entire hardware bridge to the newly added
1786      * interface's MTU first, regardless of whether the intention of the
1787      * user was to raise or lower it.
1788      */
1789     err = dsa_hw_port_list_set_mtu(&hw_port_list, dp->slave->mtu);
1790     if (!err)
1791         goto out;
1792
1793     /* Clearly that didn't work out so well, so just set the minimum MTU on
1794      * all hardware bridge ports now. If this fails too, then all ports will
1795      * still have their old MTU rolled back anyway.
1796      */
1797     dsa_hw_port_list_set_mtu(&hw_port_list, min_mtu);
1798
1799 out:
1800     dsa_hw_port_list_free(&hw_port_list);
1801 }
1802
1803 int dsa_slave_change_mtu(struct net_device *dev, int new_mtu)
1804 {
1805     struct net_device *master = dsa_slave_to_master(dev);
1806     struct dsa_port *dp = dsa_slave_to_port(dev);
1807     struct dsa_port *cpu_dp = dp->cpu_dp;
1808     struct dsa_switch *ds = dp->ds;
1809     struct dsa_port *other_dp;
1810     int largest_mtu = 0;
1811     int new_master_mtu;
1812     int old_master_mtu;
1813     int mtu_limit;
1814     int cpu_mtu;
1815     int err;
1816
1817     if (!ds->ops->port_change_mtu)
1818         return -EOPNOTSUPP;
1819
1820     dsa_tree_for_each_user_port(other_dp, ds->dst) {
1821         int slave_mtu;
1822
1823         /* During probe, this function will be called for each slave
1824          * device, while not all of them have been allocated. That's
1825          * ok, it doesn't change what the maximum is, so ignore it.
1826          */
1827         if (!other_dp->slave)
1828             continue;
1829
1830         /* Pretend that we already applied the setting, which we
1831          * actually haven't (still haven't done all integrity checks)
1832          */
1833         if (dp == other_dp)
1834             slave_mtu = new_mtu;
1835         else
1836             slave_mtu = other_dp->slave->mtu;
1837
1838         if (largest_mtu < slave_mtu)
1839             largest_mtu = slave_mtu;
1840     }
1841
1842     mtu_limit = min_t(int, master->max_mtu, dev->max_mtu);
1843     old_master_mtu = master->mtu;
1844     new_master_mtu = largest_mtu + dsa_tag_protocol_overhead(cpu_dp->tag_ops);
1845     if (new_master_mtu > mtu_limit)
1846         return -ERANGE;
1847
1848     /* If the master MTU isn't over limit, there's no need to check the CPU
1849      * MTU, since that surely isn't either.
1850      */
1851     cpu_mtu = largest_mtu;
1852
1853     /* Start applying stuff */
1854     if (new_master_mtu != old_master_mtu) {
1855         err = dev_set_mtu(master, new_master_mtu);
1856         if (err < 0)
1857             goto out_master_failed;
1858
1859         /* We only need to propagate the MTU of the CPU port to
1860          * upstream switches, so emit a notifier which updates them.
1861          */
1862         err = dsa_port_mtu_change(cpu_dp, cpu_mtu);
1863         if (err)
1864             goto out_cpu_failed;
1865     }
1866
1867     err = ds->ops->port_change_mtu(ds, dp->index, new_mtu);
1868     if (err)
1869         goto out_port_failed;
1870
1871     dev->mtu = new_mtu;
1872
1873     dsa_bridge_mtu_normalization(dp);
1874
1875     return 0;
1876
1877 out_port_failed:
1878     if (new_master_mtu != old_master_mtu)
1879         dsa_port_mtu_change(cpu_dp, old_master_mtu -
1880                     dsa_tag_protocol_overhead(cpu_dp->tag_ops));
1881 out_cpu_failed:
1882     if (new_master_mtu != old_master_mtu)
1883         dev_set_mtu(master, old_master_mtu);
1884 out_master_failed:
1885     return err;
1886 }
1887
1888 static int __maybe_unused
1889 dsa_slave_dcbnl_set_default_prio(struct net_device *dev, struct dcb_app *app)
1890 {
1891     struct dsa_port *dp = dsa_slave_to_port(dev);
1892     struct dsa_switch *ds = dp->ds;
1893     unsigned long mask, new_prio;
1894     int err, port = dp->index;
1895
1896     if (!ds->ops->port_set_default_prio)
1897         return -EOPNOTSUPP;
1898
1899     err = dcb_ieee_setapp(dev, app);
1900     if (err)
1901         return err;
1902
1903     mask = dcb_ieee_getapp_mask(dev, app);
1904     new_prio = __fls(mask);
1905
1906     err = ds->ops->port_set_default_prio(ds, port, new_prio);
1907     if (err) {
1908         dcb_ieee_delapp(dev, app);
1909         return err;
1910     }
1911
1912     return 0;
1913 }
1914
1915 static int __maybe_unused
1916 dsa_slave_dcbnl_add_dscp_prio(struct net_device *dev, struct dcb_app *app)
1917 {
1918     struct dsa_port *dp = dsa_slave_to_port(dev);
1919     struct dsa_switch *ds = dp->ds;
1920     unsigned long mask, new_prio;
1921     int err, port = dp->index;
1922     u8 dscp = app->protocol;
1923
1924     if (!ds->ops->port_add_dscp_prio)
1925         return -EOPNOTSUPP;
1926
1927     if (dscp >= 64) {
1928         netdev_err(dev, "DSCP APP entry with protocol value %u is invalid\n",
1929                dscp);
1930         return -EINVAL;
1931     }
1932
1933     err = dcb_ieee_setapp(dev, app);
1934     if (err)
1935         return err;
1936
1937     mask = dcb_ieee_getapp_mask(dev, app);
1938     new_prio = __fls(mask);
1939
1940     err = ds->ops->port_add_dscp_prio(ds, port, dscp, new_prio);
1941     if (err) {
1942         dcb_ieee_delapp(dev, app);
1943         return err;
1944     }
1945
1946     return 0;
1947 }
1948
1949 static int __maybe_unused dsa_slave_dcbnl_ieee_setapp(struct net_device *dev,
1950                               struct dcb_app *app)
1951 {
1952     switch (app->selector) {
1953     case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
1954         switch (app->protocol) {
1955         case 0:
1956             return dsa_slave_dcbnl_set_default_prio(dev, app);
1957         default:
1958             return -EOPNOTSUPP;
1959         }
1960         break;
1961     case IEEE_8021QAZ_APP_SEL_DSCP:
1962         return dsa_slave_dcbnl_add_dscp_prio(dev, app);
1963     default:
1964         return -EOPNOTSUPP;
1965     }
1966 }
1967
1968 static int __maybe_unused
1969 dsa_slave_dcbnl_del_default_prio(struct net_device *dev, struct dcb_app *app)
1970 {
1971     struct dsa_port *dp = dsa_slave_to_port(dev);
1972     struct dsa_switch *ds = dp->ds;
1973     unsigned long mask, new_prio;
1974     int err, port = dp->index;
1975
1976     if (!ds->ops->port_set_default_prio)
1977         return -EOPNOTSUPP;
1978
1979     err = dcb_ieee_delapp(dev, app);
1980     if (err)
1981         return err;
1982
1983     mask = dcb_ieee_getapp_mask(dev, app);
1984     new_prio = mask ? __fls(mask) : 0;
1985
1986     err = ds->ops->port_set_default_prio(ds, port, new_prio);
1987     if (err) {
1988         dcb_ieee_setapp(dev, app);
1989         return err;
1990     }
1991
1992     return 0;
1993 }
1994
1995 static int __maybe_unused
1996 dsa_slave_dcbnl_del_dscp_prio(struct net_device *dev, struct dcb_app *app)
1997 {
1998     struct dsa_port *dp = dsa_slave_to_port(dev);
1999     struct dsa_switch *ds = dp->ds;
2000     int err, port = dp->index;
2001     u8 dscp = app->protocol;
2002
2003     if (!ds->ops->port_del_dscp_prio)
2004         return -EOPNOTSUPP;
2005
2006     err = dcb_ieee_delapp(dev, app);
2007     if (err)
2008         return err;
2009
2010     err = ds->ops->port_del_dscp_prio(ds, port, dscp, app->priority);
2011     if (err) {
2012         dcb_ieee_setapp(dev, app);
2013         return err;
2014     }
2015
2016     return 0;
2017 }
2018
2019 static int __maybe_unused dsa_slave_dcbnl_ieee_delapp(struct net_device *dev,
2020                               struct dcb_app *app)
2021 {
2022     switch (app->selector) {
2023     case IEEE_8021QAZ_APP_SEL_ETHERTYPE:
2024         switch (app->protocol) {
2025         case 0:
2026             return dsa_slave_dcbnl_del_default_prio(dev, app);
2027         default:
2028             return -EOPNOTSUPP;
2029         }
2030         break;
2031     case IEEE_8021QAZ_APP_SEL_DSCP:
2032         return dsa_slave_dcbnl_del_dscp_prio(dev, app);
2033     default:
2034         return -EOPNOTSUPP;
2035     }
2036 }
2037
2038 /* Pre-populate the DCB application priority table with the priorities
2039  * configured during switch setup, which we read from hardware here.
2040  */
2041 static int dsa_slave_dcbnl_init(struct net_device *dev)
2042 {
2043     struct dsa_port *dp = dsa_slave_to_port(dev);
2044     struct dsa_switch *ds = dp->ds;
2045     int port = dp->index;
2046     int err;
2047
2048     if (ds->ops->port_get_default_prio) {
2049         int prio = ds->ops->port_get_default_prio(ds, port);
2050         struct dcb_app app = {
2051             .selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE,
2052             .protocol = 0,
2053             .priority = prio,
2054         };
2055
2056         if (prio < 0)
2057             return prio;
2058
2059         err = dcb_ieee_setapp(dev, &app);
2060         if (err)
2061             return err;
2062     }
2063
2064     if (ds->ops->port_get_dscp_prio) {
2065         int protocol;
2066
2067         for (protocol = 0; protocol < 64; protocol++) {
2068             struct dcb_app app = {
2069                 .selector = IEEE_8021QAZ_APP_SEL_DSCP,
2070                 .protocol = protocol,
2071             };
2072             int prio;
2073
2074             prio = ds->ops->port_get_dscp_prio(ds, port, protocol);
2075             if (prio == -EOPNOTSUPP)
2076                 continue;
2077             if (prio < 0)
2078                 return prio;
2079
2080             app.priority = prio;
2081
2082             err = dcb_ieee_setapp(dev, &app);
2083             if (err)
2084                 return err;
2085         }
2086     }
2087
2088     return 0;
2089 }
2090
2091 static const struct ethtool_ops dsa_slave_ethtool_ops = {
2092     .get_drvinfo        = dsa_slave_get_drvinfo,
2093     .get_regs_len       = dsa_slave_get_regs_len,
2094     .get_regs       = dsa_slave_get_regs,
2095     .nway_reset     = dsa_slave_nway_reset,
2096     .get_link       = ethtool_op_get_link,
2097     .get_eeprom_len     = dsa_slave_get_eeprom_len,
2098     .get_eeprom     = dsa_slave_get_eeprom,
2099     .set_eeprom     = dsa_slave_set_eeprom,
2100     .get_strings        = dsa_slave_get_strings,
2101     .get_ethtool_stats  = dsa_slave_get_ethtool_stats,
2102     .get_sset_count     = dsa_slave_get_sset_count,
2103     .get_eth_phy_stats  = dsa_slave_get_eth_phy_stats,
2104     .get_eth_mac_stats  = dsa_slave_get_eth_mac_stats,
2105     .get_eth_ctrl_stats = dsa_slave_get_eth_ctrl_stats,
2106     .get_rmon_stats     = dsa_slave_get_rmon_stats,
2107     .set_wol        = dsa_slave_set_wol,
2108     .get_wol        = dsa_slave_get_wol,
2109     .set_eee        = dsa_slave_set_eee,
2110     .get_eee        = dsa_slave_get_eee,
2111     .get_link_ksettings = dsa_slave_get_link_ksettings,
2112     .set_link_ksettings = dsa_slave_set_link_ksettings,
2113     .get_pause_stats    = dsa_slave_get_pause_stats,
2114     .get_pauseparam     = dsa_slave_get_pauseparam,
2115     .set_pauseparam     = dsa_slave_set_pauseparam,
2116     .get_rxnfc      = dsa_slave_get_rxnfc,
2117     .set_rxnfc      = dsa_slave_set_rxnfc,
2118     .get_ts_info        = dsa_slave_get_ts_info,
2119     .self_test      = dsa_slave_net_selftest,
2120 };
2121
2122 static const struct dcbnl_rtnl_ops __maybe_unused dsa_slave_dcbnl_ops = {
2123     .ieee_setapp        = dsa_slave_dcbnl_ieee_setapp,
2124     .ieee_delapp        = dsa_slave_dcbnl_ieee_delapp,
2125 };
2126
2127 static struct devlink_port *dsa_slave_get_devlink_port(struct net_device *dev)
2128 {
2129     struct dsa_port *dp = dsa_slave_to_port(dev);
2130
2131     return &dp->devlink_port;
2132 }
2133
2134 static void dsa_slave_get_stats64(struct net_device *dev,
2135                   struct rtnl_link_stats64 *s)
2136 {
2137     struct dsa_port *dp = dsa_slave_to_port(dev);
2138     struct dsa_switch *ds = dp->ds;
2139
2140     if (ds->ops->get_stats64)
2141         ds->ops->get_stats64(ds, dp->index, s);
2142     else
2143         dev_get_tstats64(dev, s);
2144 }
2145
2146 static int dsa_slave_fill_forward_path(struct net_device_path_ctx *ctx,
2147                        struct net_device_path *path)
2148 {
2149     struct dsa_port *dp = dsa_slave_to_port(ctx->dev);
2150     struct dsa_port *cpu_dp = dp->cpu_dp;
2151
2152     path->dev = ctx->dev;
2153     path->type = DEV_PATH_DSA;
2154     path->dsa.proto = cpu_dp->tag_ops->proto;
2155     path->dsa.port = dp->index;
2156     ctx->dev = cpu_dp->master;
2157
2158     return 0;
2159 }
2160
2161 static const struct net_device_ops dsa_slave_netdev_ops = {
2162     .ndo_open       = dsa_slave_open,
2163     .ndo_stop       = dsa_slave_close,
2164     .ndo_start_xmit     = dsa_slave_xmit,
2165     .ndo_change_rx_flags    = dsa_slave_change_rx_flags,
2166     .ndo_set_rx_mode    = dsa_slave_set_rx_mode,
2167     .ndo_set_mac_address    = dsa_slave_set_mac_address,
2168     .ndo_fdb_dump       = dsa_slave_fdb_dump,
2169     .ndo_eth_ioctl      = dsa_slave_ioctl,
2170     .ndo_get_iflink     = dsa_slave_get_iflink,
2171 #ifdef CONFIG_NET_POLL_CONTROLLER
2172     .ndo_netpoll_setup  = dsa_slave_netpoll_setup,
2173     .ndo_netpoll_cleanup    = dsa_slave_netpoll_cleanup,
2174     .ndo_poll_controller    = dsa_slave_poll_controller,
2175 #endif
2176     .ndo_setup_tc       = dsa_slave_setup_tc,
2177     .ndo_get_stats64    = dsa_slave_get_stats64,
2178     .ndo_vlan_rx_add_vid    = dsa_slave_vlan_rx_add_vid,
2179     .ndo_vlan_rx_kill_vid   = dsa_slave_vlan_rx_kill_vid,
2180     .ndo_get_devlink_port   = dsa_slave_get_devlink_port,
2181     .ndo_change_mtu     = dsa_slave_change_mtu,
2182     .ndo_fill_forward_path  = dsa_slave_fill_forward_path,
2183 };
2184
2185 static struct device_type dsa_type = {
2186     .name   = "dsa",
2187 };
2188
2189 void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up)
2190 {
2191     const struct dsa_port *dp = dsa_to_port(ds, port);
2192
2193     if (dp->pl)
2194         phylink_mac_change(dp->pl, up);
2195 }
2196 EXPORT_SYMBOL_GPL(dsa_port_phylink_mac_change);
2197
2198 static void dsa_slave_phylink_fixed_state(struct phylink_config *config,
2199                       struct phylink_link_state *state)
2200 {
2201     struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
2202     struct dsa_switch *ds = dp->ds;
2203
2204     /* No need to check that this operation is valid, the callback would
2205      * not be called if it was not.
2206      */
2207     ds->ops->phylink_fixed_state(ds, dp->index, state);
2208 }
2209
2210 /* slave device setup *******************************************************/
2211 static int dsa_slave_phy_connect(struct net_device *slave_dev, int addr,
2212                  u32 flags)
2213 {
2214     struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2215     struct dsa_switch *ds = dp->ds;
2216
2217     slave_dev->phydev = mdiobus_get_phy(ds->slave_mii_bus, addr);
2218     if (!slave_dev->phydev) {
2219         netdev_err(slave_dev, "no phy at %d\n", addr);
2220         return -ENODEV;
2221     }
2222
2223     slave_dev->phydev->dev_flags |= flags;
2224
2225     return phylink_connect_phy(dp->pl, slave_dev->phydev);
2226 }
2227
2228 static int dsa_slave_phy_setup(struct net_device *slave_dev)
2229 {
2230     struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2231     struct device_node *port_dn = dp->dn;
2232     struct dsa_switch *ds = dp->ds;
2233     u32 phy_flags = 0;
2234     int ret;
2235
2236     dp->pl_config.dev = &slave_dev->dev;
2237     dp->pl_config.type = PHYLINK_NETDEV;
2238
2239     /* The get_fixed_state callback takes precedence over polling the
2240      * link GPIO in PHYLINK (see phylink_get_fixed_state).  Only set
2241      * this if the switch provides such a callback.
2242      */
2243     if (ds->ops->phylink_fixed_state) {
2244         dp->pl_config.get_fixed_state = dsa_slave_phylink_fixed_state;
2245         dp->pl_config.poll_fixed_state = true;
2246     }
2247
2248     ret = dsa_port_phylink_create(dp);
2249     if (ret)
2250         return ret;
2251
2252     if (ds->ops->get_phy_flags)
2253         phy_flags = ds->ops->get_phy_flags(ds, dp->index);
2254
2255     ret = phylink_of_phy_connect(dp->pl, port_dn, phy_flags);
2256     if (ret == -ENODEV && ds->slave_mii_bus) {
2257         /* We could not connect to a designated PHY or SFP, so try to
2258          * use the switch internal MDIO bus instead
2259          */
2260         ret = dsa_slave_phy_connect(slave_dev, dp->index, phy_flags);
2261     }
2262     if (ret) {
2263         netdev_err(slave_dev, "failed to connect to PHY: %pe\n",
2264                ERR_PTR(ret));
2265         phylink_destroy(dp->pl);
2266     }
2267
2268     return ret;
2269 }
2270
2271 void dsa_slave_setup_tagger(struct net_device *slave)
2272 {
2273     struct dsa_port *dp = dsa_slave_to_port(slave);
2274     struct dsa_slave_priv *p = netdev_priv(slave);
2275     const struct dsa_port *cpu_dp = dp->cpu_dp;
2276     struct net_device *master = cpu_dp->master;
2277     const struct dsa_switch *ds = dp->ds;
2278
2279     slave->needed_headroom = cpu_dp->tag_ops->needed_headroom;
2280     slave->needed_tailroom = cpu_dp->tag_ops->needed_tailroom;
2281     /* Try to save one extra realloc later in the TX path (in the master)
2282      * by also inheriting the master's needed headroom and tailroom.
2283      * The 8021q driver also does this.
2284      */
2285     slave->needed_headroom += master->needed_headroom;
2286     slave->needed_tailroom += master->needed_tailroom;
2287
2288     p->xmit = cpu_dp->tag_ops->xmit;
2289
2290     slave->features = master->vlan_features | NETIF_F_HW_TC;
2291     slave->hw_features |= NETIF_F_HW_TC;
2292     slave->features |= NETIF_F_LLTX;
2293     if (slave->needed_tailroom)
2294         slave->features &= ~(NETIF_F_SG | NETIF_F_FRAGLIST);
2295     if (ds->needs_standalone_vlan_filtering)
2296         slave->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
2297 }
2298
2299 int dsa_slave_suspend(struct net_device *slave_dev)
2300 {
2301     struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2302
2303     if (!netif_running(slave_dev))
2304         return 0;
2305
2306     netif_device_detach(slave_dev);
2307
2308     rtnl_lock();
2309     phylink_stop(dp->pl);
2310     rtnl_unlock();
2311
2312     return 0;
2313 }
2314
2315 int dsa_slave_resume(struct net_device *slave_dev)
2316 {
2317     struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2318
2319     if (!netif_running(slave_dev))
2320         return 0;
2321
2322     netif_device_attach(slave_dev);
2323
2324     rtnl_lock();
2325     phylink_start(dp->pl);
2326     rtnl_unlock();
2327
2328     return 0;
2329 }
2330
2331 int dsa_slave_create(struct dsa_port *port)
2332 {
2333     const struct dsa_port *cpu_dp = port->cpu_dp;
2334     struct net_device *master = cpu_dp->master;
2335     struct dsa_switch *ds = port->ds;
2336     const char *name = port->name;
2337     struct net_device *slave_dev;
2338     struct dsa_slave_priv *p;
2339     int ret;
2340
2341     if (!ds->num_tx_queues)
2342         ds->num_tx_queues = 1;
2343
2344     slave_dev = alloc_netdev_mqs(sizeof(struct dsa_slave_priv), name,
2345                      NET_NAME_UNKNOWN, ether_setup,
2346                      ds->num_tx_queues, 1);
2347     if (slave_dev == NULL)
2348         return -ENOMEM;
2349
2350     slave_dev->ethtool_ops = &dsa_slave_ethtool_ops;
2351 #if IS_ENABLED(CONFIG_DCB)
2352     slave_dev->dcbnl_ops = &dsa_slave_dcbnl_ops;
2353 #endif
2354     if (!is_zero_ether_addr(port->mac))
2355         eth_hw_addr_set(slave_dev, port->mac);
2356     else
2357         eth_hw_addr_inherit(slave_dev, master);
2358     slave_dev->priv_flags |= IFF_NO_QUEUE;
2359     if (dsa_switch_supports_uc_filtering(ds))
2360         slave_dev->priv_flags |= IFF_UNICAST_FLT;
2361     slave_dev->netdev_ops = &dsa_slave_netdev_ops;
2362     if (ds->ops->port_max_mtu)
2363         slave_dev->max_mtu = ds->ops->port_max_mtu(ds, port->index);
2364     SET_NETDEV_DEVTYPE(slave_dev, &dsa_type);
2365
2366     SET_NETDEV_DEV(slave_dev, port->ds->dev);
2367     slave_dev->dev.of_node = port->dn;
2368     slave_dev->vlan_features = master->vlan_features;
2369
2370     p = netdev_priv(slave_dev);
2371     slave_dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2372     if (!slave_dev->tstats) {
2373         free_netdev(slave_dev);
2374         return -ENOMEM;
2375     }
2376
2377     ret = gro_cells_init(&p->gcells, slave_dev);
2378     if (ret)
2379         goto out_free;
2380
2381     p->dp = port;
2382     INIT_LIST_HEAD(&p->mall_tc_list);
2383     port->slave = slave_dev;
2384     dsa_slave_setup_tagger(slave_dev);
2385
2386     netif_carrier_off(slave_dev);
2387
2388     ret = dsa_slave_phy_setup(slave_dev);
2389     if (ret) {
2390         netdev_err(slave_dev,
2391                "error %d setting up PHY for tree %d, switch %d, port %d\n",
2392                ret, ds->dst->index, ds->index, port->index);
2393         goto out_gcells;
2394     }
2395
2396     rtnl_lock();
2397
2398     ret = dsa_slave_change_mtu(slave_dev, ETH_DATA_LEN);
2399     if (ret && ret != -EOPNOTSUPP)
2400         dev_warn(ds->dev, "nonfatal error %d setting MTU to %d on port %d\n",
2401              ret, ETH_DATA_LEN, port->index);
2402
2403     ret = register_netdevice(slave_dev);
2404     if (ret) {
2405         netdev_err(master, "error %d registering interface %s\n",
2406                ret, slave_dev->name);
2407         rtnl_unlock();
2408         goto out_phy;
2409     }
2410
2411     if (IS_ENABLED(CONFIG_DCB)) {
2412         ret = dsa_slave_dcbnl_init(slave_dev);
2413         if (ret) {
2414             netdev_err(slave_dev,
2415                    "failed to initialize DCB: %pe\n",
2416                    ERR_PTR(ret));
2417             rtnl_unlock();
2418             goto out_unregister;
2419         }
2420     }
2421
2422     ret = netdev_upper_dev_link(master, slave_dev, NULL);
2423
2424     rtnl_unlock();
2425
2426     if (ret)
2427         goto out_unregister;
2428
2429     return 0;
2430
2431 out_unregister:
2432     unregister_netdev(slave_dev);
2433 out_phy:
2434     rtnl_lock();
2435     phylink_disconnect_phy(p->dp->pl);
2436     rtnl_unlock();
2437     phylink_destroy(p->dp->pl);
2438 out_gcells:
2439     gro_cells_destroy(&p->gcells);
2440 out_free:
2441     free_percpu(slave_dev->tstats);
2442     free_netdev(slave_dev);
2443     port->slave = NULL;
2444     return ret;
2445 }
2446
2447 void dsa_slave_destroy(struct net_device *slave_dev)
2448 {
2449     struct net_device *master = dsa_slave_to_master(slave_dev);
2450     struct dsa_port *dp = dsa_slave_to_port(slave_dev);
2451     struct dsa_slave_priv *p = netdev_priv(slave_dev);
2452
2453     netif_carrier_off(slave_dev);
2454     rtnl_lock();
2455     netdev_upper_dev_unlink(master, slave_dev);
2456     unregister_netdevice(slave_dev);
2457     phylink_disconnect_phy(dp->pl);
2458     rtnl_unlock();
2459
2460     phylink_destroy(dp->pl);
2461     gro_cells_destroy(&p->gcells);
2462     free_percpu(slave_dev->tstats);
2463     free_netdev(slave_dev);
2464 }
2465
2466 bool dsa_slave_dev_check(const struct net_device *dev)
2467 {
2468     return dev->netdev_ops == &dsa_slave_netdev_ops;
2469 }
2470 EXPORT_SYMBOL_GPL(dsa_slave_dev_check);
2471
2472 static int dsa_slave_changeupper(struct net_device *dev,
2473                  struct netdev_notifier_changeupper_info *info)
2474 {
2475     struct dsa_port *dp = dsa_slave_to_port(dev);
2476     struct netlink_ext_ack *extack;
2477     int err = NOTIFY_DONE;
2478
2479     extack = netdev_notifier_info_to_extack(&info->info);
2480
2481     if (netif_is_bridge_master(info->upper_dev)) {
2482         if (info->linking) {
2483             err = dsa_port_bridge_join(dp, info->upper_dev, extack);
2484             if (!err)
2485                 dsa_bridge_mtu_normalization(dp);
2486             if (err == -EOPNOTSUPP) {
2487                 if (extack && !extack->_msg)
2488                     NL_SET_ERR_MSG_MOD(extack,
2489                                "Offloading not supported");
2490                 err = 0;
2491             }
2492             err = notifier_from_errno(err);
2493         } else {
2494             dsa_port_bridge_leave(dp, info->upper_dev);
2495             err = NOTIFY_OK;
2496         }
2497     } else if (netif_is_lag_master(info->upper_dev)) {
2498         if (info->linking) {
2499             err = dsa_port_lag_join(dp, info->upper_dev,
2500                         info->upper_info, extack);
2501             if (err == -EOPNOTSUPP) {
2502                 NL_SET_ERR_MSG_MOD(info->info.extack,
2503                            "Offloading not supported");
2504                 err = 0;
2505             }
2506             err = notifier_from_errno(err);
2507         } else {
2508             dsa_port_lag_leave(dp, info->upper_dev);
2509             err = NOTIFY_OK;
2510         }
2511     } else if (is_hsr_master(info->upper_dev)) {
2512         if (info->linking) {
2513             err = dsa_port_hsr_join(dp, info->upper_dev);
2514             if (err == -EOPNOTSUPP) {
2515                 NL_SET_ERR_MSG_MOD(info->info.extack,
2516                            "Offloading not supported");
2517                 err = 0;
2518             }
2519             err = notifier_from_errno(err);
2520         } else {
2521             dsa_port_hsr_leave(dp, info->upper_dev);
2522             err = NOTIFY_OK;
2523         }
2524     }
2525
2526     return err;
2527 }
2528
2529 static int dsa_slave_prechangeupper(struct net_device *dev,
2530                     struct netdev_notifier_changeupper_info *info)
2531 {
2532     struct dsa_port *dp = dsa_slave_to_port(dev);
2533
2534     if (netif_is_bridge_master(info->upper_dev) && !info->linking)
2535         dsa_port_pre_bridge_leave(dp, info->upper_dev);
2536     else if (netif_is_lag_master(info->upper_dev) && !info->linking)
2537         dsa_port_pre_lag_leave(dp, info->upper_dev);
2538     /* dsa_port_pre_hsr_leave is not yet necessary since hsr cannot be
2539      * meaningfully enslaved to a bridge yet
2540      */
2541
2542     return NOTIFY_DONE;
2543 }
2544
2545 static int
2546 dsa_slave_lag_changeupper(struct net_device *dev,
2547               struct netdev_notifier_changeupper_info *info)
2548 {
2549     struct net_device *lower;
2550     struct list_head *iter;
2551     int err = NOTIFY_DONE;
2552     struct dsa_port *dp;
2553
2554     netdev_for_each_lower_dev(dev, lower, iter) {
2555         if (!dsa_slave_dev_check(lower))
2556             continue;
2557
2558         dp = dsa_slave_to_port(lower);
2559         if (!dp->lag)
2560             /* Software LAG */
2561             continue;
2562
2563         err = dsa_slave_changeupper(lower, info);
2564         if (notifier_to_errno(err))
2565             break;
2566     }
2567
2568     return err;
2569 }
2570
2571 /* Same as dsa_slave_lag_changeupper() except that it calls
2572  * dsa_slave_prechangeupper()
2573  */
2574 static int
2575 dsa_slave_lag_prechangeupper(struct net_device *dev,
2576                  struct netdev_notifier_changeupper_info *info)
2577 {
2578     struct net_device *lower;
2579     struct list_head *iter;
2580     int err = NOTIFY_DONE;
2581     struct dsa_port *dp;
2582
2583     netdev_for_each_lower_dev(dev, lower, iter) {
2584         if (!dsa_slave_dev_check(lower))
2585             continue;
2586
2587         dp = dsa_slave_to_port(lower);
2588         if (!dp->lag)
2589             /* Software LAG */
2590             continue;
2591
2592         err = dsa_slave_prechangeupper(lower, info);
2593         if (notifier_to_errno(err))
2594             break;
2595     }
2596
2597     return err;
2598 }
2599
2600 static int
2601 dsa_prevent_bridging_8021q_upper(struct net_device *dev,
2602                  struct netdev_notifier_changeupper_info *info)
2603 {
2604     struct netlink_ext_ack *ext_ack;
2605     struct net_device *slave, *br;
2606     struct dsa_port *dp;
2607
2608     ext_ack = netdev_notifier_info_to_extack(&info->info);
2609
2610     if (!is_vlan_dev(dev))
2611         return NOTIFY_DONE;
2612
2613     slave = vlan_dev_real_dev(dev);
2614     if (!dsa_slave_dev_check(slave))
2615         return NOTIFY_DONE;
2616
2617     dp = dsa_slave_to_port(slave);
2618     br = dsa_port_bridge_dev_get(dp);
2619     if (!br)
2620         return NOTIFY_DONE;
2621
2622     /* Deny enslaving a VLAN device into a VLAN-aware bridge */
2623     if (br_vlan_enabled(br) &&
2624         netif_is_bridge_master(info->upper_dev) && info->linking) {
2625         NL_SET_ERR_MSG_MOD(ext_ack,
2626                    "Cannot enslave VLAN device into VLAN aware bridge");
2627         return notifier_from_errno(-EINVAL);
2628     }
2629
2630     return NOTIFY_DONE;
2631 }
2632
2633 static int
2634 dsa_slave_check_8021q_upper(struct net_device *dev,
2635                 struct netdev_notifier_changeupper_info *info)
2636 {
2637     struct dsa_port *dp = dsa_slave_to_port(dev);
2638     struct net_device *br = dsa_port_bridge_dev_get(dp);
2639     struct bridge_vlan_info br_info;
2640     struct netlink_ext_ack *extack;
2641     int err = NOTIFY_DONE;
2642     u16 vid;
2643
2644     if (!br || !br_vlan_enabled(br))
2645         return NOTIFY_DONE;
2646
2647     extack = netdev_notifier_info_to_extack(&info->info);
2648     vid = vlan_dev_vlan_id(info->upper_dev);
2649
2650     /* br_vlan_get_info() returns -EINVAL or -ENOENT if the
2651      * device, respectively the VID is not found, returning
2652      * 0 means success, which is a failure for us here.
2653      */
2654     err = br_vlan_get_info(br, vid, &br_info);
2655     if (err == 0) {
2656         NL_SET_ERR_MSG_MOD(extack,
2657                    "This VLAN is already configured by the bridge");
2658         return notifier_from_errno(-EBUSY);
2659     }
2660
2661     return NOTIFY_DONE;
2662 }
2663
2664 static int
2665 dsa_slave_prechangeupper_sanity_check(struct net_device *dev,
2666                       struct netdev_notifier_changeupper_info *info)
2667 {
2668     struct dsa_switch *ds;
2669     struct dsa_port *dp;
2670     int err;
2671
2672     if (!dsa_slave_dev_check(dev))
2673         return dsa_prevent_bridging_8021q_upper(dev, info);
2674
2675     dp = dsa_slave_to_port(dev);
2676     ds = dp->ds;
2677
2678     if (ds->ops->port_prechangeupper) {
2679         err = ds->ops->port_prechangeupper(ds, dp->index, info);
2680         if (err)
2681             return notifier_from_errno(err);
2682     }
2683
2684     if (is_vlan_dev(info->upper_dev))
2685         return dsa_slave_check_8021q_upper(dev, info);
2686
2687     return NOTIFY_DONE;
2688 }
2689
2690 static int dsa_slave_netdevice_event(struct notifier_block *nb,
2691                      unsigned long event, void *ptr)
2692 {
2693     struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2694
2695     switch (event) {
2696     case NETDEV_PRECHANGEUPPER: {
2697         struct netdev_notifier_changeupper_info *info = ptr;
2698         int err;
2699
2700         err = dsa_slave_prechangeupper_sanity_check(dev, info);
2701         if (err != NOTIFY_DONE)
2702             return err;
2703
2704         if (dsa_slave_dev_check(dev))
2705             return dsa_slave_prechangeupper(dev, ptr);
2706
2707         if (netif_is_lag_master(dev))
2708             return dsa_slave_lag_prechangeupper(dev, ptr);
2709
2710         break;
2711     }
2712     case NETDEV_CHANGEUPPER:
2713         if (dsa_slave_dev_check(dev))
2714             return dsa_slave_changeupper(dev, ptr);
2715
2716         if (netif_is_lag_master(dev))
2717             return dsa_slave_lag_changeupper(dev, ptr);
2718
2719         break;
2720     case NETDEV_CHANGELOWERSTATE: {
2721         struct netdev_notifier_changelowerstate_info *info = ptr;
2722         struct dsa_port *dp;
2723         int err;
2724
2725         if (!dsa_slave_dev_check(dev))
2726             break;
2727
2728         dp = dsa_slave_to_port(dev);
2729
2730         err = dsa_port_lag_change(dp, info->lower_state_info);
2731         return notifier_from_errno(err);
2732     }
2733     case NETDEV_CHANGE:
2734     case NETDEV_UP: {
2735         /* Track state of master port.
2736          * DSA driver may require the master port (and indirectly
2737          * the tagger) to be available for some special operation.
2738          */
2739         if (netdev_uses_dsa(dev)) {
2740             struct dsa_port *cpu_dp = dev->dsa_ptr;
2741             struct dsa_switch_tree *dst = cpu_dp->ds->dst;
2742
2743             /* Track when the master port is UP */
2744             dsa_tree_master_oper_state_change(dst, dev,
2745                               netif_oper_up(dev));
2746
2747             /* Track when the master port is ready and can accept
2748              * packet.
2749              * NETDEV_UP event is not enough to flag a port as ready.
2750              * We also have to wait for linkwatch_do_dev to dev_activate
2751              * and emit a NETDEV_CHANGE event.
2752              * We check if a master port is ready by checking if the dev
2753              * have a qdisc assigned and is not noop.
2754              */
2755             dsa_tree_master_admin_state_change(dst, dev,
2756                                !qdisc_tx_is_noop(dev));
2757
2758             return NOTIFY_OK;
2759         }
2760
2761         return NOTIFY_DONE;
2762     }
2763     case NETDEV_GOING_DOWN: {
2764         struct dsa_port *dp, *cpu_dp;
2765         struct dsa_switch_tree *dst;
2766         LIST_HEAD(close_list);
2767
2768         if (!netdev_uses_dsa(dev))
2769             return NOTIFY_DONE;
2770
2771         cpu_dp = dev->dsa_ptr;
2772         dst = cpu_dp->ds->dst;
2773
2774         dsa_tree_master_admin_state_change(dst, dev, false);
2775
2776         list_for_each_entry(dp, &dst->ports, list) {
2777             if (!dsa_port_is_user(dp))
2778                 continue;
2779
2780             list_add(&dp->slave->close_list, &close_list);
2781         }
2782
2783         dev_close_many(&close_list, true);
2784
2785         return NOTIFY_OK;
2786     }
2787     default:
2788         break;
2789     }
2790
2791     return NOTIFY_DONE;
2792 }
2793
2794 static void
2795 dsa_fdb_offload_notify(struct dsa_switchdev_event_work *switchdev_work)
2796 {
2797     struct switchdev_notifier_fdb_info info = {};
2798
2799     info.addr = switchdev_work->addr;
2800     info.vid = switchdev_work->vid;
2801     info.offloaded = true;
2802     call_switchdev_notifiers(SWITCHDEV_FDB_OFFLOADED,
2803                  switchdev_work->orig_dev, &info.info, NULL);
2804 }
2805
2806 static void dsa_slave_switchdev_event_work(struct work_struct *work)
2807 {
2808     struct dsa_switchdev_event_work *switchdev_work =
2809         container_of(work, struct dsa_switchdev_event_work, work);
2810     const unsigned char *addr = switchdev_work->addr;
2811     struct net_device *dev = switchdev_work->dev;
2812     u16 vid = switchdev_work->vid;
2813     struct dsa_switch *ds;
2814     struct dsa_port *dp;
2815     int err;
2816
2817     dp = dsa_slave_to_port(dev);
2818     ds = dp->ds;
2819
2820     switch (switchdev_work->event) {
2821     case SWITCHDEV_FDB_ADD_TO_DEVICE:
2822         if (switchdev_work->host_addr)
2823             err = dsa_port_bridge_host_fdb_add(dp, addr, vid);
2824         else if (dp->lag)
2825             err = dsa_port_lag_fdb_add(dp, addr, vid);
2826         else
2827             err = dsa_port_fdb_add(dp, addr, vid);
2828         if (err) {
2829             dev_err(ds->dev,
2830                 "port %d failed to add %pM vid %d to fdb: %d\n",
2831                 dp->index, addr, vid, err);
2832             break;
2833         }
2834         dsa_fdb_offload_notify(switchdev_work);
2835         break;
2836
2837     case SWITCHDEV_FDB_DEL_TO_DEVICE:
2838         if (switchdev_work->host_addr)
2839             err = dsa_port_bridge_host_fdb_del(dp, addr, vid);
2840         else if (dp->lag)
2841             err = dsa_port_lag_fdb_del(dp, addr, vid);
2842         else
2843             err = dsa_port_fdb_del(dp, addr, vid);
2844         if (err) {
2845             dev_err(ds->dev,
2846                 "port %d failed to delete %pM vid %d from fdb: %d\n",
2847                 dp->index, addr, vid, err);
2848         }
2849
2850         break;
2851     }
2852
2853     kfree(switchdev_work);
2854 }
2855
2856 static bool dsa_foreign_dev_check(const struct net_device *dev,
2857                   const struct net_device *foreign_dev)
2858 {
2859     const struct dsa_port *dp = dsa_slave_to_port(dev);
2860     struct dsa_switch_tree *dst = dp->ds->dst;
2861
2862     if (netif_is_bridge_master(foreign_dev))
2863         return !dsa_tree_offloads_bridge_dev(dst, foreign_dev);
2864
2865     if (netif_is_bridge_port(foreign_dev))
2866         return !dsa_tree_offloads_bridge_port(dst, foreign_dev);
2867
2868     /* Everything else is foreign */
2869     return true;
2870 }
2871
2872 static int dsa_slave_fdb_event(struct net_device *dev,
2873                    struct net_device *orig_dev,
2874                    unsigned long event, const void *ctx,
2875                    const struct switchdev_notifier_fdb_info *fdb_info)
2876 {
2877     struct dsa_switchdev_event_work *switchdev_work;
2878     struct dsa_port *dp = dsa_slave_to_port(dev);
2879     bool host_addr = fdb_info->is_local;
2880     struct dsa_switch *ds = dp->ds;
2881
2882     if (ctx && ctx != dp)
2883         return 0;
2884
2885     if (!dp->bridge)
2886         return 0;
2887
2888     if (switchdev_fdb_is_dynamically_learned(fdb_info)) {
2889         if (dsa_port_offloads_bridge_port(dp, orig_dev))
2890             return 0;
2891
2892         /* FDB entries learned by the software bridge or by foreign
2893          * bridge ports should be installed as host addresses only if
2894          * the driver requests assisted learning.
2895          */
2896         if (!ds->assisted_learning_on_cpu_port)
2897             return 0;
2898     }
2899
2900     /* Also treat FDB entries on foreign interfaces bridged with us as host
2901      * addresses.
2902      */
2903     if (dsa_foreign_dev_check(dev, orig_dev))
2904         host_addr = true;
2905
2906     /* Check early that we're not doing work in vain.
2907      * Host addresses on LAG ports still require regular FDB ops,
2908      * since the CPU port isn't in a LAG.
2909      */
2910     if (dp->lag && !host_addr) {
2911         if (!ds->ops->lag_fdb_add || !ds->ops->lag_fdb_del)
2912             return -EOPNOTSUPP;
2913     } else {
2914         if (!ds->ops->port_fdb_add || !ds->ops->port_fdb_del)
2915             return -EOPNOTSUPP;
2916     }
2917
2918     switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
2919     if (!switchdev_work)
2920         return -ENOMEM;
2921
2922     netdev_dbg(dev, "%s FDB entry towards %s, addr %pM vid %d%s\n",
2923            event == SWITCHDEV_FDB_ADD_TO_DEVICE ? "Adding" : "Deleting",
2924            orig_dev->name, fdb_info->addr, fdb_info->vid,
2925            host_addr ? " as host address" : "");
2926
2927     INIT_WORK(&switchdev_work->work, dsa_slave_switchdev_event_work);
2928     switchdev_work->event = event;
2929     switchdev_work->dev = dev;
2930     switchdev_work->orig_dev = orig_dev;
2931
2932     ether_addr_copy(switchdev_work->addr, fdb_info->addr);
2933     switchdev_work->vid = fdb_info->vid;
2934     switchdev_work->host_addr = host_addr;
2935
2936     dsa_schedule_work(&switchdev_work->work);
2937
2938     return 0;
2939 }
2940
2941 /* Called under rcu_read_lock() */
2942 static int dsa_slave_switchdev_event(struct notifier_block *unused,
2943                      unsigned long event, void *ptr)
2944 {
2945     struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2946     int err;
2947
2948     switch (event) {
2949     case SWITCHDEV_PORT_ATTR_SET:
2950         err = switchdev_handle_port_attr_set(dev, ptr,
2951                              dsa_slave_dev_check,
2952                              dsa_slave_port_attr_set);
2953         return notifier_from_errno(err);
2954     case SWITCHDEV_FDB_ADD_TO_DEVICE:
2955     case SWITCHDEV_FDB_DEL_TO_DEVICE:
2956         err = switchdev_handle_fdb_event_to_device(dev, event, ptr,
2957                                dsa_slave_dev_check,
2958                                dsa_foreign_dev_check,
2959                                dsa_slave_fdb_event);
2960         return notifier_from_errno(err);
2961     default:
2962         return NOTIFY_DONE;
2963     }
2964
2965     return NOTIFY_OK;
2966 }
2967
2968 static int dsa_slave_switchdev_blocking_event(struct notifier_block *unused,
2969                           unsigned long event, void *ptr)
2970 {
2971     struct net_device *dev = switchdev_notifier_info_to_dev(ptr);
2972     int err;
2973
2974     switch (event) {
2975     case SWITCHDEV_PORT_OBJ_ADD:
2976         err = switchdev_handle_port_obj_add_foreign(dev, ptr,
2977                                 dsa_slave_dev_check,
2978                                 dsa_foreign_dev_check,
2979                                 dsa_slave_port_obj_add);
2980         return notifier_from_errno(err);
2981     case SWITCHDEV_PORT_OBJ_DEL:
2982         err = switchdev_handle_port_obj_del_foreign(dev, ptr,
2983                                 dsa_slave_dev_check,
2984                                 dsa_foreign_dev_check,
2985                                 dsa_slave_port_obj_del);
2986         return notifier_from_errno(err);
2987     case SWITCHDEV_PORT_ATTR_SET:
2988         err = switchdev_handle_port_attr_set(dev, ptr,
2989                              dsa_slave_dev_check,
2990                              dsa_slave_port_attr_set);
2991         return notifier_from_errno(err);
2992     }
2993
2994     return NOTIFY_DONE;
2995 }
2996
2997 static struct notifier_block dsa_slave_nb __read_mostly = {
2998     .notifier_call  = dsa_slave_netdevice_event,
2999 };
3000
3001 struct notifier_block dsa_slave_switchdev_notifier = {
3002     .notifier_call = dsa_slave_switchdev_event,
3003 };
3004
3005 struct notifier_block dsa_slave_switchdev_blocking_notifier = {
3006     .notifier_call = dsa_slave_switchdev_blocking_event,
3007 };
3008
3009 int dsa_slave_register_notifier(void)
3010 {
3011     struct notifier_block *nb;
3012     int err;
3013
3014     err = register_netdevice_notifier(&dsa_slave_nb);
3015     if (err)
3016         return err;
3017
3018     err = register_switchdev_notifier(&dsa_slave_switchdev_notifier);
3019     if (err)
3020         goto err_switchdev_nb;
3021
3022     nb = &dsa_slave_switchdev_blocking_notifier;
3023     err = register_switchdev_blocking_notifier(nb);
3024     if (err)
3025         goto err_switchdev_blocking_nb;
3026
3027     return 0;
3028
3029 err_switchdev_blocking_nb:
3030     unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3031 err_switchdev_nb:
3032     unregister_netdevice_notifier(&dsa_slave_nb);
3033     return err;
3034 }
3035
3036 void dsa_slave_unregister_notifier(void)
3037 {
3038     struct notifier_block *nb;
3039     int err;
3040
3041     nb = &dsa_slave_switchdev_blocking_notifier;
3042     err = unregister_switchdev_blocking_notifier(nb);
3043     if (err)
3044         pr_err("DSA: failed to unregister switchdev blocking notifier (%d)\n", err);
3045
3046     err = unregister_switchdev_notifier(&dsa_slave_switchdev_notifier);
3047     if (err)
3048         pr_err("DSA: failed to unregister switchdev notifier (%d)\n", err);
3049
3050     err = unregister_netdevice_notifier(&dsa_slave_nb);
3051     if (err)
3052         pr_err("DSA: failed to unregister slave notifier (%d)\n", err);
3053 }