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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> | |
1faabf74 | 15 | #include <net/switchdev.h> |
ea5dd34b VD |
16 | |
17 | #include "dsa_priv.h" | |
f515f192 | 18 | |
1faabf74 VD |
19 | static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds, |
20 | unsigned int ageing_time) | |
21 | { | |
22 | int i; | |
23 | ||
24 | for (i = 0; i < ds->num_ports; ++i) { | |
25 | struct dsa_port *dp = &ds->ports[i]; | |
26 | ||
27 | if (dp->ageing_time && dp->ageing_time < ageing_time) | |
28 | ageing_time = dp->ageing_time; | |
29 | } | |
30 | ||
31 | return ageing_time; | |
32 | } | |
33 | ||
34 | static int dsa_switch_ageing_time(struct dsa_switch *ds, | |
35 | struct dsa_notifier_ageing_time_info *info) | |
36 | { | |
37 | unsigned int ageing_time = info->ageing_time; | |
38 | struct switchdev_trans *trans = info->trans; | |
39 | ||
40 | /* Do not care yet about other switch chips of the fabric */ | |
41 | if (ds->index != info->sw_index) | |
42 | return 0; | |
43 | ||
44 | if (switchdev_trans_ph_prepare(trans)) { | |
45 | if (ds->ageing_time_min && ageing_time < ds->ageing_time_min) | |
46 | return -ERANGE; | |
47 | if (ds->ageing_time_max && ageing_time > ds->ageing_time_max) | |
48 | return -ERANGE; | |
49 | return 0; | |
50 | } | |
51 | ||
52 | /* Program the fastest ageing time in case of multiple bridges */ | |
53 | ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time); | |
54 | ||
55 | if (ds->ops->set_ageing_time) | |
56 | return ds->ops->set_ageing_time(ds, ageing_time); | |
57 | ||
58 | return 0; | |
59 | } | |
60 | ||
04d3a4c6 VD |
61 | static int dsa_switch_bridge_join(struct dsa_switch *ds, |
62 | struct dsa_notifier_bridge_info *info) | |
63 | { | |
64 | if (ds->index == info->sw_index && ds->ops->port_bridge_join) | |
65 | return ds->ops->port_bridge_join(ds, info->port, info->br); | |
66 | ||
40ef2c93 VD |
67 | if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join) |
68 | return ds->ops->crosschip_bridge_join(ds, info->sw_index, | |
69 | info->port, info->br); | |
04d3a4c6 VD |
70 | |
71 | return 0; | |
72 | } | |
73 | ||
74 | static int dsa_switch_bridge_leave(struct dsa_switch *ds, | |
75 | struct dsa_notifier_bridge_info *info) | |
76 | { | |
77 | if (ds->index == info->sw_index && ds->ops->port_bridge_leave) | |
78 | ds->ops->port_bridge_leave(ds, info->port, info->br); | |
79 | ||
40ef2c93 VD |
80 | if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave) |
81 | ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port, | |
82 | info->br); | |
04d3a4c6 VD |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
685fb6a4 VD |
87 | static int dsa_switch_fdb_add(struct dsa_switch *ds, |
88 | struct dsa_notifier_fdb_info *info) | |
89 | { | |
90 | const struct switchdev_obj_port_fdb *fdb = info->fdb; | |
91 | struct switchdev_trans *trans = info->trans; | |
92 | ||
93 | /* Do not care yet about other switch chips of the fabric */ | |
94 | if (ds->index != info->sw_index) | |
95 | return 0; | |
96 | ||
97 | if (switchdev_trans_ph_prepare(trans)) { | |
98 | if (!ds->ops->port_fdb_prepare || !ds->ops->port_fdb_add) | |
99 | return -EOPNOTSUPP; | |
100 | ||
101 | return ds->ops->port_fdb_prepare(ds, info->port, fdb, trans); | |
102 | } | |
103 | ||
104 | ds->ops->port_fdb_add(ds, info->port, fdb, trans); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int dsa_switch_fdb_del(struct dsa_switch *ds, | |
110 | struct dsa_notifier_fdb_info *info) | |
111 | { | |
112 | const struct switchdev_obj_port_fdb *fdb = info->fdb; | |
113 | ||
114 | /* Do not care yet about other switch chips of the fabric */ | |
115 | if (ds->index != info->sw_index) | |
116 | return 0; | |
117 | ||
118 | if (!ds->ops->port_fdb_del) | |
119 | return -EOPNOTSUPP; | |
120 | ||
121 | return ds->ops->port_fdb_del(ds, info->port, fdb); | |
122 | } | |
123 | ||
f515f192 VD |
124 | static int dsa_switch_event(struct notifier_block *nb, |
125 | unsigned long event, void *info) | |
126 | { | |
127 | struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb); | |
128 | int err; | |
129 | ||
130 | switch (event) { | |
1faabf74 VD |
131 | case DSA_NOTIFIER_AGEING_TIME: |
132 | err = dsa_switch_ageing_time(ds, info); | |
133 | break; | |
04d3a4c6 VD |
134 | case DSA_NOTIFIER_BRIDGE_JOIN: |
135 | err = dsa_switch_bridge_join(ds, info); | |
136 | break; | |
137 | case DSA_NOTIFIER_BRIDGE_LEAVE: | |
138 | err = dsa_switch_bridge_leave(ds, info); | |
139 | break; | |
685fb6a4 VD |
140 | case DSA_NOTIFIER_FDB_ADD: |
141 | err = dsa_switch_fdb_add(ds, info); | |
142 | break; | |
143 | case DSA_NOTIFIER_FDB_DEL: | |
144 | err = dsa_switch_fdb_del(ds, info); | |
145 | break; | |
f515f192 VD |
146 | default: |
147 | err = -EOPNOTSUPP; | |
148 | break; | |
149 | } | |
150 | ||
151 | /* Non-switchdev operations cannot be rolled back. If a DSA driver | |
152 | * returns an error during the chained call, switch chips may be in an | |
153 | * inconsistent state. | |
154 | */ | |
155 | if (err) | |
156 | dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n", | |
157 | event, err); | |
158 | ||
159 | return notifier_from_errno(err); | |
160 | } | |
161 | ||
162 | int dsa_switch_register_notifier(struct dsa_switch *ds) | |
163 | { | |
164 | ds->nb.notifier_call = dsa_switch_event; | |
165 | ||
166 | return raw_notifier_chain_register(&ds->dst->nh, &ds->nb); | |
167 | } | |
168 | ||
169 | void dsa_switch_unregister_notifier(struct dsa_switch *ds) | |
170 | { | |
171 | int err; | |
172 | ||
173 | err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb); | |
174 | if (err) | |
175 | dev_err(ds->dev, "failed to unregister notifier (%d)\n", err); | |
176 | } |