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ec7328b591
Allow the user to switch from the current per-VLAN STP mode to an MST mode. Up to this point, per-VLAN STP states where always isolated from each other. This is in contrast to the MSTP standard (802.1Q-2018, Clause 13.5), where VLANs are grouped into MST instances (MSTIs), and the state is managed on a per-MSTI level, rather that at the per-VLAN level. Perhaps due to the prevalence of the standard, many switching ASICs are built after the same model. Therefore, add a corresponding MST mode to the bridge, which we can later add offloading support for in a straight-forward way. For now, all VLANs are fixed to MSTI 0, also called the Common Spanning Tree (CST). That is, all VLANs will follow the port-global state. Upcoming changes will make this actually useful by allowing VLANs to be mapped to arbitrary MSTIs and allow individual MSTI states to be changed. Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Acked-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Bridge Multiple Spanning Tree Support
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*
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* Authors:
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* Tobias Waldekranz <tobias@waldekranz.com>
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*/
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#include <linux/kernel.h>
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#include "br_private.h"
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DEFINE_STATIC_KEY_FALSE(br_mst_used);
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static void br_mst_vlan_set_state(struct net_bridge_port *p, struct net_bridge_vlan *v,
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u8 state)
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{
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struct net_bridge_vlan_group *vg = nbp_vlan_group(p);
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if (v->state == state)
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return;
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br_vlan_set_state(v, state);
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if (v->vid == vg->pvid)
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br_vlan_set_pvid_state(vg, state);
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}
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int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,
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struct netlink_ext_ack *extack)
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{
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struct net_bridge_vlan_group *vg;
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struct net_bridge_vlan *v;
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vg = nbp_vlan_group(p);
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if (!vg)
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return 0;
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list_for_each_entry(v, &vg->vlan_list, vlist) {
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if (v->brvlan->msti != msti)
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continue;
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br_mst_vlan_set_state(p, v, state);
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}
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return 0;
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}
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void br_mst_vlan_init_state(struct net_bridge_vlan *v)
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{
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/* VLANs always start out in MSTI 0 (CST) */
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v->msti = 0;
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if (br_vlan_is_master(v))
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v->state = BR_STATE_FORWARDING;
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else
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v->state = v->port->state;
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}
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int br_mst_set_enabled(struct net_bridge *br, bool on,
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struct netlink_ext_ack *extack)
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{
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struct net_bridge_vlan_group *vg;
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struct net_bridge_port *p;
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list_for_each_entry(p, &br->port_list, list) {
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vg = nbp_vlan_group(p);
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if (!vg->num_vlans)
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continue;
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NL_SET_ERR_MSG(extack,
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"MST mode can't be changed while VLANs exist");
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return -EBUSY;
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}
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if (br_opt_get(br, BROPT_MST_ENABLED) == on)
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return 0;
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if (on)
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static_branch_enable(&br_mst_used);
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else
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static_branch_disable(&br_mst_used);
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br_opt_toggle(br, BROPT_MST_ENABLED, on);
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return 0;
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}
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