projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| f515f192 VD |
1 | /* |
| 2 | * Handling of a single switch chip, part of a switch fabric | |
| 3 | * | |
| 4333d619 VD |
4 | * Copyright (c) 2017 Savoir-faire Linux Inc. |
| 5 | * Vivien Didelot <vivien.didelot@savoirfairelinux.com> | |
| f515f192 VD |
6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License as published by | |
| 9 | * the Free Software Foundation; either version 2 of the License, or | |
| 10 | * (at your option) any later version. | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/netdevice.h> | |
| 14 | #include <linux/notifier.h> | |
| 15 | #include <net/dsa.h> | |
| 16 | ||
| 04d3a4c6 VD |
17 | static int dsa_switch_bridge_join(struct dsa_switch *ds, |
| 18 | struct dsa_notifier_bridge_info *info) | |
| 19 | { | |
| 20 | if (ds->index == info->sw_index && ds->ops->port_bridge_join) | |
| 21 | return ds->ops->port_bridge_join(ds, info->port, info->br); | |
| 22 | ||
| 40ef2c93 VD |
23 | if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join) |
| 24 | return ds->ops->crosschip_bridge_join(ds, info->sw_index, | |
| 25 | info->port, info->br); | |
| 04d3a4c6 VD |
26 | |
| 27 | return 0; | |
| 28 | } | |
| 29 | ||
| 30 | static int dsa_switch_bridge_leave(struct dsa_switch *ds, | |
| 31 | struct dsa_notifier_bridge_info *info) | |
| 32 | { | |
| 33 | if (ds->index == info->sw_index && ds->ops->port_bridge_leave) | |
| 34 | ds->ops->port_bridge_leave(ds, info->port, info->br); | |
| 35 | ||
| 40ef2c93 VD |
36 | if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave) |
| 37 | ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port, | |
| 38 | info->br); | |
| 04d3a4c6 VD |
39 | |
| 40 | return 0; | |
| 41 | } | |
| 42 | ||
| f515f192 VD |
43 | static int dsa_switch_event(struct notifier_block *nb, |
| 44 | unsigned long event, void *info) | |
| 45 | { | |
| 46 | struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); | |
| 47 | int err; | |
| 48 | ||
| 49 | switch (event) { | |
| 04d3a4c6 VD |
50 | case DSA_NOTIFIER_BRIDGE_JOIN: |
| 51 | err = dsa_switch_bridge_join(ds, info); | |
| 52 | break; | |
| 53 | case DSA_NOTIFIER_BRIDGE_LEAVE: | |
| 54 | err = dsa_switch_bridge_leave(ds, info); | |
| 55 | break; | |
| f515f192 VD |
56 | default: |
| 57 | err = -EOPNOTSUPP; | |
| 58 | break; | |
| 59 | } | |
| 60 | ||
| 61 | /* Non-switchdev operations cannot be rolled back. If a DSA driver | |
| 62 | * returns an error during the chained call, switch chips may be in an | |
| 63 | * inconsistent state. | |
| 64 | */ | |
| 65 | if (err) | |
| 66 | dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", | |
| 67 | event, err); | |
| 68 | ||
| 69 | return notifier_from_errno(err); | |
| 70 | } | |
| 71 | ||
| 72 | int dsa_switch_register_notifier(struct dsa_switch *ds) | |
| 73 | { | |
| 74 | ds->nb.notifier_call = dsa_switch_event; | |
| 75 | ||
| 76 | return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); | |
| 77 | } | |
| 78 | ||
| 79 | void dsa_switch_unregister_notifier(struct dsa_switch *ds) | |
| 80 | { | |
| 81 | int err; | |
| 82 | ||
| 83 | err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); | |
| 84 | if (err) | |
| 85 | dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); | |
| 86 | } |