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https://github.com/torvalds/linux
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1faabf7440
This patch keeps the port-wide ageing time handling code in dsa_port_ageing_time, pushes the requested ageing time value in a new switch fabric notification, and moves the switch-wide ageing time handling code in dsa_switch_ageing_time. This has the effect that now not only the switch that the target port belongs to can be programmed, but all switches composing the switch fabric. For the moment, keep the current behavior and ignore other switches. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
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* Handling of a single switch chip, part of a switch fabric
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*
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* Copyright (c) 2017 Savoir-faire Linux Inc.
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* Vivien Didelot <vivien.didelot@savoirfairelinux.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/netdevice.h>
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#include <linux/notifier.h>
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#include <net/switchdev.h>
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#include "dsa_priv.h"
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static unsigned int dsa_switch_fastest_ageing_time(struct dsa_switch *ds,
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unsigned int ageing_time)
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{
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int i;
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for (i = 0; i < ds->num_ports; ++i) {
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struct dsa_port *dp = &ds->ports[i];
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if (dp->ageing_time && dp->ageing_time < ageing_time)
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ageing_time = dp->ageing_time;
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}
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return ageing_time;
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}
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static int dsa_switch_ageing_time(struct dsa_switch *ds,
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struct dsa_notifier_ageing_time_info *info)
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{
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unsigned int ageing_time = info->ageing_time;
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struct switchdev_trans *trans = info->trans;
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/* Do not care yet about other switch chips of the fabric */
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if (ds->index != info->sw_index)
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return 0;
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if (switchdev_trans_ph_prepare(trans)) {
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if (ds->ageing_time_min && ageing_time < ds->ageing_time_min)
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return -ERANGE;
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if (ds->ageing_time_max && ageing_time > ds->ageing_time_max)
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return -ERANGE;
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return 0;
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}
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/* Program the fastest ageing time in case of multiple bridges */
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ageing_time = dsa_switch_fastest_ageing_time(ds, ageing_time);
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if (ds->ops->set_ageing_time)
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return ds->ops->set_ageing_time(ds, ageing_time);
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return 0;
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}
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static int dsa_switch_bridge_join(struct dsa_switch *ds,
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struct dsa_notifier_bridge_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_bridge_join)
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return ds->ops->port_bridge_join(ds, info->port, info->br);
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if (ds->index != info->sw_index && ds->ops->crosschip_bridge_join)
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return ds->ops->crosschip_bridge_join(ds, info->sw_index,
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info->port, info->br);
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return 0;
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}
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static int dsa_switch_bridge_leave(struct dsa_switch *ds,
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struct dsa_notifier_bridge_info *info)
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{
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if (ds->index == info->sw_index && ds->ops->port_bridge_leave)
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ds->ops->port_bridge_leave(ds, info->port, info->br);
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if (ds->index != info->sw_index && ds->ops->crosschip_bridge_leave)
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ds->ops->crosschip_bridge_leave(ds, info->sw_index, info->port,
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info->br);
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return 0;
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}
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static int dsa_switch_event(struct notifier_block *nb,
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unsigned long event, void *info)
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{
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struct dsa_switch *ds = container_of(nb, struct dsa_switch, nb);
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int err;
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switch (event) {
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case DSA_NOTIFIER_AGEING_TIME:
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err = dsa_switch_ageing_time(ds, info);
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break;
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case DSA_NOTIFIER_BRIDGE_JOIN:
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err = dsa_switch_bridge_join(ds, info);
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break;
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case DSA_NOTIFIER_BRIDGE_LEAVE:
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err = dsa_switch_bridge_leave(ds, info);
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break;
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default:
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err = -EOPNOTSUPP;
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break;
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}
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/* Non-switchdev operations cannot be rolled back. If a DSA driver
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* returns an error during the chained call, switch chips may be in an
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* inconsistent state.
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*/
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if (err)
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dev_dbg(ds->dev, "breaking chain for DSA event %lu (%d)\n",
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event, err);
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return notifier_from_errno(err);
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}
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int dsa_switch_register_notifier(struct dsa_switch *ds)
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{
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ds->nb.notifier_call = dsa_switch_event;
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return raw_notifier_chain_register(&ds->dst->nh, &ds->nb);
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}
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void dsa_switch_unregister_notifier(struct dsa_switch *ds)
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{
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int err;
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err = raw_notifier_chain_unregister(&ds->dst->nh, &ds->nb);
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if (err)
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dev_err(ds->dev, "failed to unregister notifier (%d)\n", err);
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}
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