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authorVivien Didelot <vivien.didelot@savoirfairelinux.com>2017-02-03 13:20:20 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-06 16:53:29 -0500
commitf515f192ab4f45bb695146b82432d63d98775787 (patch)
tree5a6fddcbb34e28e6850e63d3023504b46e5ea9c3 /net/dsa/switch.c
parentc5d35cb32cffa6e4c2db1cbd9a544e10a8d6fda9 (diff)
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.c53
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);
+}