projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |