diff options
author | Vivien Didelot <vivien.didelot@savoirfairelinux.com> | 2017-02-03 19:20:20 +0100 |
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committer | David S. Miller <davem@davemloft.net> | 2017-02-06 22:53:29 +0100 |
commit | f515f192ab4f45bb695146b82432d63d98775787 (patch) | |
tree | 5a6fddcbb34e28e6850e63d3023504b46e5ea9c3 /net/dsa/switch.c | |
parent | net: dsa: change state setter scope (diff) | |
download | linux-f515f192ab4f45bb695146b82432d63d98775787.tar.xz linux-f515f192ab4f45bb695146b82432d63d98775787.zip |
net: dsa: add switch notifier
Add a notifier block per DSA switch, registered against a notifier head
in the switch fabric they belong to.
This infrastructure will allow to propagate fabric-wide events such as
port bridging, VLAN configuration, etc. If a DSA switch driver cares
about cross-chip configuration, such events can be caught.
Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dsa/switch.c')
-rw-r--r-- | net/dsa/switch.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/net/dsa/switch.c b/net/dsa/switch.c new file mode 100644 index 000000000000..e22fa7633d03 --- /dev/null +++ b/net/dsa/switch.c @@ -0,0 +1,53 @@ +/* + * Handling of a single switch chip, part of a switch fabric + * + * Copyright (c) 2017 Vivien Didelot <vivien.didelot@savoirfairelinux.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/netdevice.h> +#include <linux/notifier.h> +#include <net/dsa.h> + +static int dsa_switch_event(struct notifier_block *nb, + unsigned long event, void *info) +{ + struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); + int err; + + switch (event) { + default: + err = -EOPNOTSUPP; + break; + } + + /* Non-switchdev operations cannot be rolled back. If a DSA driver + * returns an error during the chained call, switch chips may be in an + * inconsistent state. + */ + if (err) + dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", + event, err); + + return notifier_from_errno(err); +} + +int dsa_switch_register_notifier(struct dsa_switch *ds) +{ + ds->nb.notifier_call = dsa_switch_event; + + return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); +} + +void dsa_switch_unregister_notifier(struct dsa_switch *ds) +{ + int err; + + err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); + if (err) + dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); +} |