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 | * | |
| 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_event(struct notifier_block *nb, | |
| 17 | unsigned long event, void *info) | |
| 18 | { | |
| 19 | struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); | |
| 20 | int err; | |
| 21 | ||
| 22 | switch (event) { | |
| 23 | default: | |
| 24 | err = -EOPNOTSUPP; | |
| 25 | break; | |
| 26 | } | |
| 27 | ||
| 28 | /* Non-switchdev operations cannot be rolled back. If a DSA driver | |
| 29 | * returns an error during the chained call, switch chips may be in an | |
| 30 | * inconsistent state. | |
| 31 | */ | |
| 32 | if (err) | |
| 33 | dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", | |
| 34 | event, err); | |
| 35 | ||
| 36 | return notifier_from_errno(err); | |
| 37 | } | |
| 38 | ||
| 39 | int dsa_switch_register_notifier(struct dsa_switch *ds) | |
| 40 | { | |
| 41 | ds->nb.notifier_call = dsa_switch_event; | |
| 42 | ||
| 43 | return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); | |
| 44 | } | |
| 45 | ||
| 46 | void dsa_switch_unregister_notifier(struct dsa_switch *ds) | |
| 47 | { | |
| 48 | int err; | |
| 49 | ||
| 50 | err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); | |
| 51 | if (err) | |
| 52 | dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); | |
| 53 | } |