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957e2235e5
With the introduction of explicit offloading API in switchdev in commit2f5dc00f7a
("net: bridge: switchdev: let drivers inform which bridge ports are offloaded"), we started having Ethernet switch drivers calling directly into a function exported by net/bridge/br_switchdev.c, which is a function exported by the bridge driver. This means that drivers that did not have an explicit dependency on the bridge before, like cpsw and am65-cpsw, now do - otherwise it is not possible to call a symbol exported by a driver that can be built as module unless you are a module too. There was an attempt to solve the dependency issue in the form of commitb0e8181762
("net: build all switchdev drivers as modules when the bridge is a module"). Grygorii Strashko, however, says about it: | In my opinion, the problem is a bit bigger here than just fixing the | build :( | | In case, of ^cpsw the switchdev mode is kinda optional and in many | cases (especially for testing purposes, NFS) the multi-mac mode is | still preferable mode. | | There were no such tight dependency between switchdev drivers and | bridge core before and switchdev serviced as independent, notification | based layer between them, so ^cpsw still can be "Y" and bridge can be | "M". Now for mostly every kernel build configuration the CONFIG_BRIDGE | will need to be set as "Y", or we will have to update drivers to | support build with BRIDGE=n and maintain separate builds for | networking vs non-networking testing. But is this enough? Wouldn't | it cause 'chain reaction' required to add more and more "Y" options | (like CONFIG_VLAN_8021Q)? | | PS. Just to be sure we on the same page - ARM builds will be forced | (with this patch) to have CONFIG_TI_CPSW_SWITCHDEV=m and so all our | automation testing will just fail with omap2plus_defconfig. In the light of this, it would be desirable for some configurations to avoid dependencies between switchdev drivers and the bridge, and have the switchdev mode as completely optional within the driver. Arnd Bergmann also tried to write a patch which better expressed the build time dependency for Ethernet switch drivers where the switchdev support is optional, like cpsw/am65-cpsw, and this made the drivers follow the bridge (compile as module if the bridge is a module) only if the optional switchdev support in the driver was enabled in the first place: https://patchwork.kernel.org/project/netdevbpf/patch/20210802144813.1152762-1-arnd@kernel.org/ but this still did not solve the fact that cpsw and am65-cpsw now must be built as modules when the bridge is a module - it just expressed correctly that optional dependency. But the new behavior is an apparent regression from Grygorii's perspective. So to support the use case where the Ethernet driver is built-in, NET_SWITCHDEV (a bool option) is enabled, and the bridge is a module, we need a framework that can handle the possible absence of the bridge from the running system, i.e. runtime bloatware as opposed to build-time bloatware. Luckily we already have this framework, since switchdev has been using it extensively. Events from the bridge side are transmitted to the driver side using notifier chains - this was originally done so that unrelated drivers could snoop for events emitted by the bridge towards ports that are implemented by other drivers (think of a switch driver with LAG offload that listens for switchdev events on a bonding/team interface that it offloads). There are also events which are transmitted from the driver side to the bridge side, which again are modeled using notifiers. SWITCHDEV_FDB_ADD_TO_BRIDGE is an example of this, and deals with notifying the bridge that a MAC address has been dynamically learned. So there is a precedent we can use for modeling the new framework. The difference compared to SWITCHDEV_FDB_ADD_TO_BRIDGE is that the work that the bridge needs to do when a port becomes offloaded is blocking in its nature: replay VLANs, MDBs etc. The calling context is indeed blocking (we are under rtnl_mutex), but the existing switchdev notification chain that the bridge is subscribed to is only the atomic one. So we need to subscribe the bridge to the blocking switchdev notification chain too. This patch: - keeps the driver-side perception of the switchdev_bridge_port_{,un}offload unchanged - moves the implementation of switchdev_bridge_port_{,un}offload from the bridge module into the switchdev module. - makes everybody that is subscribed to the switchdev blocking notifier chain "hear" offload & unoffload events - makes the bridge driver subscribe and handle those events - moves the bridge driver's handling of those events into 2 new functions called br_switchdev_port_{,un}offload. These functions contain in fact the core of the logic that was previously in switchdev_bridge_port_{,un}offload, just that now we go through an extra indirection layer to reach them. Unlike all the other switchdev notification structures, the structure used to carry the bridge port information, struct switchdev_notifier_brport_info, does not contain a "bool handled". This is because in the current usage pattern, we always know that a switchdev bridge port offloading event will be handled by the bridge, because the switchdev_bridge_port_offload() call was initiated by a NETDEV_CHANGEUPPER event in the first place, where info->upper_dev is a bridge. So if the bridge wasn't loaded, then the CHANGEUPPER event couldn't have happened. Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Tested-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: David S. Miller <davem@davemloft.net>
494 lines
14 KiB
C
494 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* include/net/switchdev.h - Switch device API
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* Copyright (c) 2014-2015 Jiri Pirko <jiri@resnulli.us>
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* Copyright (c) 2014-2015 Scott Feldman <sfeldma@gmail.com>
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*/
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#ifndef _LINUX_SWITCHDEV_H_
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#define _LINUX_SWITCHDEV_H_
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#include <linux/netdevice.h>
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#include <linux/notifier.h>
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#include <linux/list.h>
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#include <net/ip_fib.h>
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#define SWITCHDEV_F_NO_RECURSE BIT(0)
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#define SWITCHDEV_F_SKIP_EOPNOTSUPP BIT(1)
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#define SWITCHDEV_F_DEFER BIT(2)
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enum switchdev_attr_id {
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SWITCHDEV_ATTR_ID_UNDEFINED,
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SWITCHDEV_ATTR_ID_PORT_STP_STATE,
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SWITCHDEV_ATTR_ID_PORT_BRIDGE_FLAGS,
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SWITCHDEV_ATTR_ID_PORT_PRE_BRIDGE_FLAGS,
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SWITCHDEV_ATTR_ID_PORT_MROUTER,
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SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
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SWITCHDEV_ATTR_ID_BRIDGE_VLAN_FILTERING,
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SWITCHDEV_ATTR_ID_BRIDGE_VLAN_PROTOCOL,
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SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
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SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
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SWITCHDEV_ATTR_ID_MRP_PORT_ROLE,
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};
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struct switchdev_brport_flags {
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unsigned long val;
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unsigned long mask;
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};
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struct switchdev_attr {
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struct net_device *orig_dev;
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enum switchdev_attr_id id;
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u32 flags;
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void *complete_priv;
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void (*complete)(struct net_device *dev, int err, void *priv);
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union {
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u8 stp_state; /* PORT_STP_STATE */
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struct switchdev_brport_flags brport_flags; /* PORT_BRIDGE_FLAGS */
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bool mrouter; /* PORT_MROUTER */
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clock_t ageing_time; /* BRIDGE_AGEING_TIME */
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bool vlan_filtering; /* BRIDGE_VLAN_FILTERING */
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u16 vlan_protocol; /* BRIDGE_VLAN_PROTOCOL */
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bool mc_disabled; /* MC_DISABLED */
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u8 mrp_port_role; /* MRP_PORT_ROLE */
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} u;
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};
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enum switchdev_obj_id {
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SWITCHDEV_OBJ_ID_UNDEFINED,
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SWITCHDEV_OBJ_ID_PORT_VLAN,
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SWITCHDEV_OBJ_ID_PORT_MDB,
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SWITCHDEV_OBJ_ID_HOST_MDB,
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SWITCHDEV_OBJ_ID_MRP,
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SWITCHDEV_OBJ_ID_RING_TEST_MRP,
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SWITCHDEV_OBJ_ID_RING_ROLE_MRP,
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SWITCHDEV_OBJ_ID_RING_STATE_MRP,
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SWITCHDEV_OBJ_ID_IN_TEST_MRP,
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SWITCHDEV_OBJ_ID_IN_ROLE_MRP,
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SWITCHDEV_OBJ_ID_IN_STATE_MRP,
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};
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struct switchdev_obj {
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struct list_head list;
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struct net_device *orig_dev;
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enum switchdev_obj_id id;
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u32 flags;
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void *complete_priv;
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void (*complete)(struct net_device *dev, int err, void *priv);
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};
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/* SWITCHDEV_OBJ_ID_PORT_VLAN */
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struct switchdev_obj_port_vlan {
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struct switchdev_obj obj;
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u16 flags;
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u16 vid;
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};
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#define SWITCHDEV_OBJ_PORT_VLAN(OBJ) \
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container_of((OBJ), struct switchdev_obj_port_vlan, obj)
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/* SWITCHDEV_OBJ_ID_PORT_MDB */
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struct switchdev_obj_port_mdb {
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struct switchdev_obj obj;
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unsigned char addr[ETH_ALEN];
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u16 vid;
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};
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#define SWITCHDEV_OBJ_PORT_MDB(OBJ) \
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container_of((OBJ), struct switchdev_obj_port_mdb, obj)
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/* SWITCHDEV_OBJ_ID_MRP */
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struct switchdev_obj_mrp {
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struct switchdev_obj obj;
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struct net_device *p_port;
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struct net_device *s_port;
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u32 ring_id;
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u16 prio;
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};
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#define SWITCHDEV_OBJ_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_mrp, obj)
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/* SWITCHDEV_OBJ_ID_RING_TEST_MRP */
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struct switchdev_obj_ring_test_mrp {
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struct switchdev_obj obj;
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/* The value is in us and a value of 0 represents to stop */
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u32 interval;
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u8 max_miss;
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u32 ring_id;
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u32 period;
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bool monitor;
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};
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#define SWITCHDEV_OBJ_RING_TEST_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_ring_test_mrp, obj)
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/* SWICHDEV_OBJ_ID_RING_ROLE_MRP */
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struct switchdev_obj_ring_role_mrp {
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struct switchdev_obj obj;
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u8 ring_role;
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u32 ring_id;
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u8 sw_backup;
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};
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#define SWITCHDEV_OBJ_RING_ROLE_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_ring_role_mrp, obj)
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struct switchdev_obj_ring_state_mrp {
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struct switchdev_obj obj;
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u8 ring_state;
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u32 ring_id;
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};
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#define SWITCHDEV_OBJ_RING_STATE_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_ring_state_mrp, obj)
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/* SWITCHDEV_OBJ_ID_IN_TEST_MRP */
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struct switchdev_obj_in_test_mrp {
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struct switchdev_obj obj;
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/* The value is in us and a value of 0 represents to stop */
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u32 interval;
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u32 in_id;
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u32 period;
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u8 max_miss;
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};
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#define SWITCHDEV_OBJ_IN_TEST_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_in_test_mrp, obj)
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/* SWICHDEV_OBJ_ID_IN_ROLE_MRP */
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struct switchdev_obj_in_role_mrp {
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struct switchdev_obj obj;
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struct net_device *i_port;
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u32 ring_id;
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u16 in_id;
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u8 in_role;
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u8 sw_backup;
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};
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#define SWITCHDEV_OBJ_IN_ROLE_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_in_role_mrp, obj)
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struct switchdev_obj_in_state_mrp {
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struct switchdev_obj obj;
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u32 in_id;
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u8 in_state;
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};
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#define SWITCHDEV_OBJ_IN_STATE_MRP(OBJ) \
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container_of((OBJ), struct switchdev_obj_in_state_mrp, obj)
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typedef int switchdev_obj_dump_cb_t(struct switchdev_obj *obj);
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struct switchdev_brport {
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struct net_device *dev;
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const void *ctx;
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struct notifier_block *atomic_nb;
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struct notifier_block *blocking_nb;
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bool tx_fwd_offload;
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};
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enum switchdev_notifier_type {
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SWITCHDEV_FDB_ADD_TO_BRIDGE = 1,
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SWITCHDEV_FDB_DEL_TO_BRIDGE,
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SWITCHDEV_FDB_ADD_TO_DEVICE,
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SWITCHDEV_FDB_DEL_TO_DEVICE,
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SWITCHDEV_FDB_OFFLOADED,
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SWITCHDEV_FDB_FLUSH_TO_BRIDGE,
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SWITCHDEV_PORT_OBJ_ADD, /* Blocking. */
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SWITCHDEV_PORT_OBJ_DEL, /* Blocking. */
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SWITCHDEV_PORT_ATTR_SET, /* May be blocking . */
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SWITCHDEV_VXLAN_FDB_ADD_TO_BRIDGE,
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SWITCHDEV_VXLAN_FDB_DEL_TO_BRIDGE,
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SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE,
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SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE,
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SWITCHDEV_VXLAN_FDB_OFFLOADED,
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SWITCHDEV_BRPORT_OFFLOADED,
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SWITCHDEV_BRPORT_UNOFFLOADED,
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};
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struct switchdev_notifier_info {
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struct net_device *dev;
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struct netlink_ext_ack *extack;
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const void *ctx;
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};
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struct switchdev_notifier_fdb_info {
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struct switchdev_notifier_info info; /* must be first */
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const unsigned char *addr;
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u16 vid;
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u8 added_by_user:1,
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is_local:1,
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offloaded:1;
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};
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struct switchdev_notifier_port_obj_info {
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struct switchdev_notifier_info info; /* must be first */
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const struct switchdev_obj *obj;
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bool handled;
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};
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struct switchdev_notifier_port_attr_info {
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struct switchdev_notifier_info info; /* must be first */
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const struct switchdev_attr *attr;
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bool handled;
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};
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struct switchdev_notifier_brport_info {
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struct switchdev_notifier_info info; /* must be first */
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const struct switchdev_brport brport;
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};
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static inline struct net_device *
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switchdev_notifier_info_to_dev(const struct switchdev_notifier_info *info)
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{
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return info->dev;
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}
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static inline struct netlink_ext_ack *
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switchdev_notifier_info_to_extack(const struct switchdev_notifier_info *info)
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{
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return info->extack;
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}
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static inline bool
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switchdev_fdb_is_dynamically_learned(const struct switchdev_notifier_fdb_info *fdb_info)
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{
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return !fdb_info->added_by_user && !fdb_info->is_local;
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}
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#ifdef CONFIG_NET_SWITCHDEV
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int switchdev_bridge_port_offload(struct net_device *brport_dev,
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struct net_device *dev, const void *ctx,
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struct notifier_block *atomic_nb,
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struct notifier_block *blocking_nb,
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bool tx_fwd_offload,
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struct netlink_ext_ack *extack);
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void switchdev_bridge_port_unoffload(struct net_device *brport_dev,
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const void *ctx,
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struct notifier_block *atomic_nb,
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struct notifier_block *blocking_nb);
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void switchdev_deferred_process(void);
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int switchdev_port_attr_set(struct net_device *dev,
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const struct switchdev_attr *attr,
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struct netlink_ext_ack *extack);
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int switchdev_port_obj_add(struct net_device *dev,
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const struct switchdev_obj *obj,
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struct netlink_ext_ack *extack);
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int switchdev_port_obj_del(struct net_device *dev,
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const struct switchdev_obj *obj);
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int register_switchdev_notifier(struct notifier_block *nb);
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int unregister_switchdev_notifier(struct notifier_block *nb);
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int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
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struct switchdev_notifier_info *info,
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struct netlink_ext_ack *extack);
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int register_switchdev_blocking_notifier(struct notifier_block *nb);
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int unregister_switchdev_blocking_notifier(struct notifier_block *nb);
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int call_switchdev_blocking_notifiers(unsigned long val, struct net_device *dev,
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struct switchdev_notifier_info *info,
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struct netlink_ext_ack *extack);
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void switchdev_port_fwd_mark_set(struct net_device *dev,
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struct net_device *group_dev,
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bool joining);
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int switchdev_handle_fdb_add_to_device(struct net_device *dev,
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const struct switchdev_notifier_fdb_info *fdb_info,
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bool (*check_cb)(const struct net_device *dev),
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bool (*foreign_dev_check_cb)(const struct net_device *dev,
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const struct net_device *foreign_dev),
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int (*add_cb)(struct net_device *dev,
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const struct net_device *orig_dev, const void *ctx,
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const struct switchdev_notifier_fdb_info *fdb_info),
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int (*lag_add_cb)(struct net_device *dev,
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const struct net_device *orig_dev, const void *ctx,
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const struct switchdev_notifier_fdb_info *fdb_info));
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int switchdev_handle_fdb_del_to_device(struct net_device *dev,
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const struct switchdev_notifier_fdb_info *fdb_info,
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bool (*check_cb)(const struct net_device *dev),
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bool (*foreign_dev_check_cb)(const struct net_device *dev,
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const struct net_device *foreign_dev),
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int (*del_cb)(struct net_device *dev,
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const struct net_device *orig_dev, const void *ctx,
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const struct switchdev_notifier_fdb_info *fdb_info),
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int (*lag_del_cb)(struct net_device *dev,
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const struct net_device *orig_dev, const void *ctx,
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const struct switchdev_notifier_fdb_info *fdb_info));
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int switchdev_handle_port_obj_add(struct net_device *dev,
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struct switchdev_notifier_port_obj_info *port_obj_info,
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bool (*check_cb)(const struct net_device *dev),
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int (*add_cb)(struct net_device *dev, const void *ctx,
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const struct switchdev_obj *obj,
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struct netlink_ext_ack *extack));
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int switchdev_handle_port_obj_del(struct net_device *dev,
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struct switchdev_notifier_port_obj_info *port_obj_info,
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bool (*check_cb)(const struct net_device *dev),
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int (*del_cb)(struct net_device *dev, const void *ctx,
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const struct switchdev_obj *obj));
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int switchdev_handle_port_attr_set(struct net_device *dev,
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struct switchdev_notifier_port_attr_info *port_attr_info,
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bool (*check_cb)(const struct net_device *dev),
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int (*set_cb)(struct net_device *dev, const void *ctx,
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const struct switchdev_attr *attr,
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struct netlink_ext_ack *extack));
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#else
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static inline int
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switchdev_bridge_port_offload(struct net_device *brport_dev,
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struct net_device *dev, const void *ctx,
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struct notifier_block *atomic_nb,
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struct notifier_block *blocking_nb,
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bool tx_fwd_offload,
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struct netlink_ext_ack *extack)
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{
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return -EOPNOTSUPP;
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}
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static inline void
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switchdev_bridge_port_unoffload(struct net_device *brport_dev,
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const void *ctx,
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struct notifier_block *atomic_nb,
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struct notifier_block *blocking_nb)
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{
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}
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static inline void switchdev_deferred_process(void)
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{
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}
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static inline int switchdev_port_attr_set(struct net_device *dev,
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const struct switchdev_attr *attr,
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struct netlink_ext_ack *extack)
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{
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return -EOPNOTSUPP;
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}
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static inline int switchdev_port_obj_add(struct net_device *dev,
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const struct switchdev_obj *obj,
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struct netlink_ext_ack *extack)
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{
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return -EOPNOTSUPP;
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}
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static inline int switchdev_port_obj_del(struct net_device *dev,
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const struct switchdev_obj *obj)
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{
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return -EOPNOTSUPP;
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}
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static inline int register_switchdev_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int unregister_switchdev_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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static inline int call_switchdev_notifiers(unsigned long val,
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struct net_device *dev,
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struct switchdev_notifier_info *info,
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struct netlink_ext_ack *extack)
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{
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return NOTIFY_DONE;
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}
|
|
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static inline int
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register_switchdev_blocking_notifier(struct notifier_block *nb)
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{
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return 0;
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}
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|
|
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static inline int
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unregister_switchdev_blocking_notifier(struct notifier_block *nb)
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|
{
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return 0;
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|
}
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|
|
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static inline int
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|
call_switchdev_blocking_notifiers(unsigned long val,
|
|
struct net_device *dev,
|
|
struct switchdev_notifier_info *info,
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|
struct netlink_ext_ack *extack)
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|
{
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|
return NOTIFY_DONE;
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}
|
|
|
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static inline int
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|
switchdev_handle_fdb_add_to_device(struct net_device *dev,
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const struct switchdev_notifier_fdb_info *fdb_info,
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bool (*check_cb)(const struct net_device *dev),
|
|
bool (*foreign_dev_check_cb)(const struct net_device *dev,
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const struct net_device *foreign_dev),
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int (*add_cb)(struct net_device *dev,
|
|
const struct net_device *orig_dev, const void *ctx,
|
|
const struct switchdev_notifier_fdb_info *fdb_info),
|
|
int (*lag_add_cb)(struct net_device *dev,
|
|
const struct net_device *orig_dev, const void *ctx,
|
|
const struct switchdev_notifier_fdb_info *fdb_info))
|
|
{
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|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
switchdev_handle_fdb_del_to_device(struct net_device *dev,
|
|
const struct switchdev_notifier_fdb_info *fdb_info,
|
|
bool (*check_cb)(const struct net_device *dev),
|
|
bool (*foreign_dev_check_cb)(const struct net_device *dev,
|
|
const struct net_device *foreign_dev),
|
|
int (*del_cb)(struct net_device *dev,
|
|
const struct net_device *orig_dev, const void *ctx,
|
|
const struct switchdev_notifier_fdb_info *fdb_info),
|
|
int (*lag_del_cb)(struct net_device *dev,
|
|
const struct net_device *orig_dev, const void *ctx,
|
|
const struct switchdev_notifier_fdb_info *fdb_info))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
switchdev_handle_port_obj_add(struct net_device *dev,
|
|
struct switchdev_notifier_port_obj_info *port_obj_info,
|
|
bool (*check_cb)(const struct net_device *dev),
|
|
int (*add_cb)(struct net_device *dev, const void *ctx,
|
|
const struct switchdev_obj *obj,
|
|
struct netlink_ext_ack *extack))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
switchdev_handle_port_obj_del(struct net_device *dev,
|
|
struct switchdev_notifier_port_obj_info *port_obj_info,
|
|
bool (*check_cb)(const struct net_device *dev),
|
|
int (*del_cb)(struct net_device *dev, const void *ctx,
|
|
const struct switchdev_obj *obj))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
switchdev_handle_port_attr_set(struct net_device *dev,
|
|
struct switchdev_notifier_port_attr_info *port_attr_info,
|
|
bool (*check_cb)(const struct net_device *dev),
|
|
int (*set_cb)(struct net_device *dev, const void *ctx,
|
|
const struct switchdev_attr *attr,
|
|
struct netlink_ext_ack *extack))
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#endif /* _LINUX_SWITCHDEV_H_ */
|