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a40c175b VD |
1 | /* |
2 | * Handling of a single switch port | |
3 | * | |
4 | * Copyright (c) 2017 Savoir-faire Linux Inc. | |
5 | * Vivien Didelot <vivien.didelot@savoirfairelinux.com> | |
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/if_bridge.h> | |
cfbed329 | 14 | #include <linux/notifier.h> |
a40c175b VD |
15 | |
16 | #include "dsa_priv.h" | |
17 | ||
cfbed329 VD |
18 | static int dsa_port_notify(struct dsa_port *dp, unsigned long e, void *v) |
19 | { | |
20 | struct raw_notifier_head *nh = &dp->ds->dst->nh; | |
21 | int err; | |
22 | ||
23 | err = raw_notifier_call_chain(nh, e, v); | |
24 | ||
25 | return notifier_to_errno(err); | |
26 | } | |
27 | ||
a40c175b VD |
28 | int dsa_port_set_state(struct dsa_port *dp, u8 state, |
29 | struct switchdev_trans *trans) | |
30 | { | |
31 | struct dsa_switch *ds = dp->ds; | |
32 | int port = dp->index; | |
33 | ||
34 | if (switchdev_trans_ph_prepare(trans)) | |
35 | return ds->ops->port_stp_state_set ? 0 : -EOPNOTSUPP; | |
36 | ||
37 | if (ds->ops->port_stp_state_set) | |
38 | ds->ops->port_stp_state_set(ds, port, state); | |
39 | ||
40 | if (ds->ops->port_fast_age) { | |
41 | /* Fast age FDB entries or flush appropriate forwarding database | |
42 | * for the given port, if we are moving it from Learning or | |
43 | * Forwarding state, to Disabled or Blocking or Listening state. | |
44 | */ | |
45 | ||
46 | if ((dp->stp_state == BR_STATE_LEARNING || | |
47 | dp->stp_state == BR_STATE_FORWARDING) && | |
48 | (state == BR_STATE_DISABLED || | |
49 | state == BR_STATE_BLOCKING || | |
50 | state == BR_STATE_LISTENING)) | |
51 | ds->ops->port_fast_age(ds, port); | |
52 | } | |
53 | ||
54 | dp->stp_state = state; | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | void dsa_port_set_state_now(struct dsa_port *dp, u8 state) | |
60 | { | |
61 | int err; | |
62 | ||
63 | err = dsa_port_set_state(dp, state, NULL); | |
64 | if (err) | |
65 | pr_err("DSA: failed to set STP state %u (%d)\n", state, err); | |
66 | } | |
cfbed329 VD |
67 | |
68 | int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br) | |
69 | { | |
70 | struct dsa_notifier_bridge_info info = { | |
71 | .sw_index = dp->ds->index, | |
72 | .port = dp->index, | |
73 | .br = br, | |
74 | }; | |
75 | int err; | |
76 | ||
77 | /* Here the port is already bridged. Reflect the current configuration | |
78 | * so that drivers can program their chips accordingly. | |
79 | */ | |
80 | dp->bridge_dev = br; | |
81 | ||
82 | err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_JOIN, &info); | |
83 | ||
84 | /* The bridging is rolled back on error */ | |
85 | if (err) | |
86 | dp->bridge_dev = NULL; | |
87 | ||
88 | return err; | |
89 | } | |
90 | ||
91 | void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br) | |
92 | { | |
93 | struct dsa_notifier_bridge_info info = { | |
94 | .sw_index = dp->ds->index, | |
95 | .port = dp->index, | |
96 | .br = br, | |
97 | }; | |
98 | int err; | |
99 | ||
100 | /* Here the port is already unbridged. Reflect the current configuration | |
101 | * so that drivers can program their chips accordingly. | |
102 | */ | |
103 | dp->bridge_dev = NULL; | |
104 | ||
105 | err = dsa_port_notify(dp, DSA_NOTIFIER_BRIDGE_LEAVE, &info); | |
106 | if (err) | |
107 | pr_err("DSA: failed to notify DSA_NOTIFIER_BRIDGE_LEAVE\n"); | |
108 | ||
109 | /* Port left the bridge, put in BR_STATE_DISABLED by the bridge layer, | |
110 | * so allow it to be in BR_STATE_FORWARDING to be kept functional | |
111 | */ | |
112 | dsa_port_set_state_now(dp, BR_STATE_FORWARDING); | |
113 | } |