1 /* 2 * Handling of a single switch chip, part of a switch fabric 3 * 4 * Copyright (c) 2017 Vivien Didelot <vivien.didelot@savoirfairelinux.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/netdevice.h> 13 #include <linux/notifier.h> 14 #include <net/dsa.h> 15 16 static int dsa_switch_bridge_join(struct dsa_switch *ds, 17 struct dsa_notifier_bridge_info *info) 18 { 19 if (ds->index == info->sw_index && ds->ops->port_bridge_join) 20 return ds->ops->port_bridge_join(ds, info->port, info->br); 21 22 if (ds->index != info->sw_index) 23 dev_dbg(ds->dev, "crosschip DSA port %d.%d bridged to %s\n", 24 info->sw_index, info->port, netdev_name(info->br)); 25 26 return 0; 27 } 28 29 static int dsa_switch_bridge_leave(struct dsa_switch *ds, 30 struct dsa_notifier_bridge_info *info) 31 { 32 if (ds->index == info->sw_index && ds->ops->port_bridge_leave) 33 ds->ops->port_bridge_leave(ds, info->port, info->br); 34 35 if (ds->index != info->sw_index) 36 dev_dbg(ds->dev, "crosschip DSA port %d.%d unbridged from %s\n", 37 info->sw_index, info->port, netdev_name(info->br)); 38 39 return 0; 40 } 41 42 static int dsa_switch_event(struct notifier_block *nb, 43 unsigned long event, void *info) 44 { 45 struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); 46 int err; 47 48 switch (event) { 49 case DSA_NOTIFIER_BRIDGE_JOIN: 50 err = dsa_switch_bridge_join(ds, info); 51 break; 52 case DSA_NOTIFIER_BRIDGE_LEAVE: 53 err = dsa_switch_bridge_leave(ds, info); 54 break; 55 default: 56 err = -EOPNOTSUPP; 57 break; 58 } 59 60 /* Non-switchdev operations cannot be rolled back. If a DSA driver 61 * returns an error during the chained call, switch chips may be in an 62 * inconsistent state. 63 */ 64 if (err) 65 dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", 66 event, err); 67 68 return notifier_from_errno(err); 69 } 70 71 int dsa_switch_register_notifier(struct dsa_switch *ds) 72 { 73 ds->nb.notifier_call = dsa_switch_event; 74 75 return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); 76 } 77 78 void dsa_switch_unregister_notifier(struct dsa_switch *ds) 79 { 80 int err; 81 82 err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); 83 if (err) 84 dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); 85 } 86