bfcb813203
It is useful be able to configure port policers on a switch to accept
frames of various sizes:
- Increase the MTU for better throughput from the default of 1500 if it
is known that there is no 10/100 Mbps device in the network.
- Decrease the MTU to limit the latency of high-priority frames under
congestion, or work around various network segments that add extra
headers to packets which can't be fragmented.
For DSA slave ports, this is mostly a pass-through callback, called
through the regular ndo ops and at probe time (to ensure consistency
across all supported switches).
The CPU port is called with an MTU equal to the largest configured MTU
of the slave ports. The assumption is that the user might want to
sustain a bidirectional conversation with a partner over any switch
port.
The DSA master is configured the same as the CPU port, plus the tagger
overhead. Since the MTU is by definition L2 payload (sans Ethernet
header), it is up to each individual driver to figure out if it needs to
do anything special for its frame tags on the CPU port (it shouldn't
except in special cases). So the MTU does not contain the tagger
overhead on the CPU port.
However the MTU of the DSA master, minus the tagger overhead, is used as
a proxy for the MTU of the CPU port, which does not have a net device.
This is to avoid uselessly calling the .change_mtu function on the CPU
port when nothing should change.
So it is safe to assume that the DSA master and the CPU port MTUs are
apart by exactly the tagger's overhead in bytes.
Some changes were made around dsa_master_set_mtu(), function which was
now removed, for 2 reasons:
- dev_set_mtu() already calls dev_validate_mtu(), so it's redundant to
do the same thing in DSA
- __dev_set_mtu() returns 0 if ops->ndo_change_mtu is an absent method
That is to say, there's no need for this function in DSA, we can safely
call dev_set_mtu() directly, take the rtnl lock when necessary, and just
propagate whatever errors get reported (since the user probably wants to
be informed).
Some inspiration (mainly in the MTU DSA notifier) was taken from a
vaguely similar patch from Murali and Florian, who are credited as
co-developers down below.
Co-developed-by: Murali Krishna Policharla <murali.policharla@broadcom.com>
Signed-off-by: Murali Krishna Policharla <murali.policharla@broadcom.com>
Co-developed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
198 lines
5.8 KiB
C
198 lines
5.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* net/dsa/dsa_priv.h - Hardware switch handling
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* Copyright (c) 2008-2009 Marvell Semiconductor
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*/
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#ifndef __DSA_PRIV_H
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#define __DSA_PRIV_H
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#include <linux/phy.h>
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#include <linux/netdevice.h>
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#include <linux/netpoll.h>
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#include <net/dsa.h>
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enum {
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DSA_NOTIFIER_AGEING_TIME,
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DSA_NOTIFIER_BRIDGE_JOIN,
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DSA_NOTIFIER_BRIDGE_LEAVE,
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DSA_NOTIFIER_FDB_ADD,
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DSA_NOTIFIER_FDB_DEL,
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DSA_NOTIFIER_MDB_ADD,
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DSA_NOTIFIER_MDB_DEL,
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DSA_NOTIFIER_VLAN_ADD,
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DSA_NOTIFIER_VLAN_DEL,
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DSA_NOTIFIER_MTU,
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};
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/* DSA_NOTIFIER_AGEING_TIME */
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struct dsa_notifier_ageing_time_info {
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struct switchdev_trans *trans;
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unsigned int ageing_time;
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};
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/* DSA_NOTIFIER_BRIDGE_* */
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struct dsa_notifier_bridge_info {
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struct net_device *br;
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int sw_index;
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int port;
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};
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/* DSA_NOTIFIER_FDB_* */
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struct dsa_notifier_fdb_info {
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int sw_index;
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int port;
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const unsigned char *addr;
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u16 vid;
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};
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/* DSA_NOTIFIER_MDB_* */
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struct dsa_notifier_mdb_info {
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const struct switchdev_obj_port_mdb *mdb;
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struct switchdev_trans *trans;
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int sw_index;
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int port;
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};
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/* DSA_NOTIFIER_VLAN_* */
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struct dsa_notifier_vlan_info {
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const struct switchdev_obj_port_vlan *vlan;
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struct switchdev_trans *trans;
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int sw_index;
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int port;
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};
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/* DSA_NOTIFIER_MTU */
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struct dsa_notifier_mtu_info {
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bool propagate_upstream;
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int sw_index;
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int port;
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int mtu;
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};
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struct dsa_slave_priv {
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/* Copy of CPU port xmit for faster access in slave transmit hot path */
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struct sk_buff * (*xmit)(struct sk_buff *skb,
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struct net_device *dev);
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struct pcpu_sw_netstats *stats64;
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/* DSA port data, such as switch, port index, etc. */
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struct dsa_port *dp;
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#ifdef CONFIG_NET_POLL_CONTROLLER
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struct netpoll *netpoll;
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#endif
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/* TC context */
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struct list_head mall_tc_list;
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};
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/* dsa.c */
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const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol);
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void dsa_tag_driver_put(const struct dsa_device_ops *ops);
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bool dsa_schedule_work(struct work_struct *work);
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const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops);
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int dsa_legacy_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
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struct net_device *dev,
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const unsigned char *addr, u16 vid,
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u16 flags,
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struct netlink_ext_ack *extack);
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int dsa_legacy_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
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struct net_device *dev,
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const unsigned char *addr, u16 vid);
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/* master.c */
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int dsa_master_setup(struct net_device *dev, struct dsa_port *cpu_dp);
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void dsa_master_teardown(struct net_device *dev);
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static inline struct net_device *dsa_master_find_slave(struct net_device *dev,
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int device, int port)
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{
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struct dsa_port *cpu_dp = dev->dsa_ptr;
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struct dsa_switch_tree *dst = cpu_dp->dst;
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struct dsa_port *dp;
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list_for_each_entry(dp, &dst->ports, list)
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if (dp->ds->index == device && dp->index == port &&
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dp->type == DSA_PORT_TYPE_USER)
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return dp->slave;
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return NULL;
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}
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/* port.c */
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int dsa_port_set_state(struct dsa_port *dp, u8 state,
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struct switchdev_trans *trans);
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int dsa_port_enable_rt(struct dsa_port *dp, struct phy_device *phy);
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int dsa_port_enable(struct dsa_port *dp, struct phy_device *phy);
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void dsa_port_disable_rt(struct dsa_port *dp);
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void dsa_port_disable(struct dsa_port *dp);
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int dsa_port_bridge_join(struct dsa_port *dp, struct net_device *br);
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void dsa_port_bridge_leave(struct dsa_port *dp, struct net_device *br);
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int dsa_port_vlan_filtering(struct dsa_port *dp, bool vlan_filtering,
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struct switchdev_trans *trans);
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int dsa_port_ageing_time(struct dsa_port *dp, clock_t ageing_clock,
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struct switchdev_trans *trans);
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int dsa_port_mtu_change(struct dsa_port *dp, int new_mtu,
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bool propagate_upstream);
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int dsa_port_fdb_add(struct dsa_port *dp, const unsigned char *addr,
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u16 vid);
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int dsa_port_fdb_del(struct dsa_port *dp, const unsigned char *addr,
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u16 vid);
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int dsa_port_fdb_dump(struct dsa_port *dp, dsa_fdb_dump_cb_t *cb, void *data);
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int dsa_port_mdb_add(const struct dsa_port *dp,
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const struct switchdev_obj_port_mdb *mdb,
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struct switchdev_trans *trans);
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int dsa_port_mdb_del(const struct dsa_port *dp,
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const struct switchdev_obj_port_mdb *mdb);
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int dsa_port_pre_bridge_flags(const struct dsa_port *dp, unsigned long flags,
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struct switchdev_trans *trans);
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int dsa_port_bridge_flags(const struct dsa_port *dp, unsigned long flags,
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struct switchdev_trans *trans);
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int dsa_port_mrouter(struct dsa_port *dp, bool mrouter,
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struct switchdev_trans *trans);
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int dsa_port_vlan_add(struct dsa_port *dp,
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const struct switchdev_obj_port_vlan *vlan,
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struct switchdev_trans *trans);
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int dsa_port_vlan_del(struct dsa_port *dp,
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const struct switchdev_obj_port_vlan *vlan);
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int dsa_port_vid_add(struct dsa_port *dp, u16 vid, u16 flags);
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int dsa_port_vid_del(struct dsa_port *dp, u16 vid);
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int dsa_port_link_register_of(struct dsa_port *dp);
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void dsa_port_link_unregister_of(struct dsa_port *dp);
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extern const struct phylink_mac_ops dsa_port_phylink_mac_ops;
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/* slave.c */
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extern const struct dsa_device_ops notag_netdev_ops;
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void dsa_slave_mii_bus_init(struct dsa_switch *ds);
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int dsa_slave_create(struct dsa_port *dp);
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void dsa_slave_destroy(struct net_device *slave_dev);
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bool dsa_slave_dev_check(const struct net_device *dev);
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int dsa_slave_suspend(struct net_device *slave_dev);
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int dsa_slave_resume(struct net_device *slave_dev);
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int dsa_slave_register_notifier(void);
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void dsa_slave_unregister_notifier(void);
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static inline struct dsa_port *dsa_slave_to_port(const struct net_device *dev)
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{
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struct dsa_slave_priv *p = netdev_priv(dev);
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return p->dp;
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}
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static inline struct net_device *
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dsa_slave_to_master(const struct net_device *dev)
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{
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struct dsa_port *dp = dsa_slave_to_port(dev);
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return dp->cpu_dp->master;
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}
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/* switch.c */
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int dsa_switch_register_notifier(struct dsa_switch *ds);
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void dsa_switch_unregister_notifier(struct dsa_switch *ds);
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#endif
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