2019-05-27 14:55:01 +08:00
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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net: Distributed Switch Architecture protocol support
Distributed Switch Architecture is a protocol for managing hardware
switch chips. It consists of a set of MII management registers and
commands to configure the switch, and an ethernet header format to
signal which of the ports of the switch a packet was received from
or is intended to be sent to.
The switches that this driver supports are typically embedded in
access points and routers, and a typical setup with a DSA switch
looks something like this:
+-----------+ +-----------+
| | RGMII | |
| +-------+ +------ 1000baseT MDI ("WAN")
| | | 6-port +------ 1000baseT MDI ("LAN1")
| CPU | | ethernet +------ 1000baseT MDI ("LAN2")
| |MIImgmt| switch +------ 1000baseT MDI ("LAN3")
| +-------+ w/5 PHYs +------ 1000baseT MDI ("LAN4")
| | | |
+-----------+ +-----------+
The switch driver presents each port on the switch as a separate
network interface to Linux, polls the switch to maintain software
link state of those ports, forwards MII management interface
accesses to those network interfaces (e.g. as done by ethtool) to
the switch, and exposes the switch's hardware statistics counters
via the appropriate Linux kernel interfaces.
This initial patch supports the MII management interface register
layout of the Marvell 88E6123, 88E6161 and 88E6165 switch chips, and
supports the "Ethertype DSA" packet tagging format.
(There is no officially registered ethertype for the Ethertype DSA
packet format, so we just grab a random one. The ethertype to use
is programmed into the switch, and the switch driver uses the value
of ETH_P_EDSA for this, so this define can be changed at any time in
the future if the one we chose is allocated to another protocol or
if Ethertype DSA gets its own officially registered ethertype, and
everything will continue to work.)
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Nicolas Pitre <nico@marvell.com>
Tested-by: Byron Bradley <byron.bbradley@gmail.com>
Tested-by: Tim Ellis <tim.ellis@mac.com>
Tested-by: Peter van Valderen <linux@ddcrew.com>
Tested-by: Dirk Teurlings <dirk@upexia.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-10-07 21:44:02 +08:00
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/*
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* include/net/dsa.h - Driver for Distributed Switch Architecture switch chips
|
dsa: add switch chip cascading support
The initial version of the DSA driver only supported a single switch
chip per network interface, while DSA-capable switch chips can be
interconnected to form a tree of switch chips. This patch adds support
for multiple switch chips on a network interface.
An example topology for a 16-port device with an embedded CPU is as
follows:
+-----+ +--------+ +--------+
| |eth0 10| switch |9 10| switch |
| CPU +----------+ +-------+ |
| | | chip 0 | | chip 1 |
+-----+ +---++---+ +---++---+
|| ||
|| ||
||1000baseT ||1000baseT
||ports 1-8 ||ports 9-16
This requires a couple of interdependent changes in the DSA layer:
- The dsa platform driver data needs to be extended: there is still
only one netdevice per DSA driver instance (eth0 in the example
above), but each of the switch chips in the tree needs its own
mii_bus device pointer, MII management bus address, and port name
array. (include/net/dsa.h) The existing in-tree dsa users need
some small changes to deal with this. (arch/arm)
- The DSA and Ethertype DSA tagging modules need to be extended to
use the DSA device ID field on receive and demultiplex the packet
accordingly, and fill in the DSA device ID field on transmit
according to which switch chip the packet is heading to.
(net/dsa/tag_{dsa,edsa}.c)
- The concept of "CPU port", which is the switch chip port that the
CPU is connected to (port 10 on switch chip 0 in the example), needs
to be extended with the concept of "upstream port", which is the
port on the switch chip that will bring us one hop closer to the CPU
(port 10 for both switch chips in the example above).
- The dsa platform data needs to specify which ports on which switch
chips are links to other switch chips, so that we can enable DSA
tagging mode on them. (For inter-switch links, we always use
non-EtherType DSA tagging, since it has lower overhead. The CPU
link uses dsa or edsa tagging depending on what the 'root' switch
chip supports.) This is done by specifying "dsa" for the given
port in the port array.
- The dsa platform data needs to be extended with information on via
which port to reach any given switch chip from any given switch chip.
This info is specified via the per-switch chip data struct ->rtable[]
array, which gives the nexthop ports for each of the other switches
in the tree.
For the example topology above, the dsa platform data would look
something like this:
static struct dsa_chip_data sw[2] = {
{
.mii_bus = &foo,
.sw_addr = 1,
.port_names[0] = "p1",
.port_names[1] = "p2",
.port_names[2] = "p3",
.port_names[3] = "p4",
.port_names[4] = "p5",
.port_names[5] = "p6",
.port_names[6] = "p7",
.port_names[7] = "p8",
.port_names[9] = "dsa",
.port_names[10] = "cpu",
.rtable = (s8 []){ -1, 9, },
}, {
.mii_bus = &foo,
.sw_addr = 2,
.port_names[0] = "p9",
.port_names[1] = "p10",
.port_names[2] = "p11",
.port_names[3] = "p12",
.port_names[4] = "p13",
.port_names[5] = "p14",
.port_names[6] = "p15",
.port_names[7] = "p16",
.port_names[10] = "dsa",
.rtable = (s8 []){ 10, -1, },
},
},
static struct dsa_platform_data pd = {
.netdev = &foo,
.nr_switches = 2,
.sw = sw,
};
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-20 17:52:09 +08:00
|
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* Copyright (c) 2008-2009 Marvell Semiconductor
|
net: Distributed Switch Architecture protocol support
Distributed Switch Architecture is a protocol for managing hardware
switch chips. It consists of a set of MII management registers and
commands to configure the switch, and an ethernet header format to
signal which of the ports of the switch a packet was received from
or is intended to be sent to.
The switches that this driver supports are typically embedded in
access points and routers, and a typical setup with a DSA switch
looks something like this:
+-----------+ +-----------+
| | RGMII | |
| +-------+ +------ 1000baseT MDI ("WAN")
| | | 6-port +------ 1000baseT MDI ("LAN1")
| CPU | | ethernet +------ 1000baseT MDI ("LAN2")
| |MIImgmt| switch +------ 1000baseT MDI ("LAN3")
| +-------+ w/5 PHYs +------ 1000baseT MDI ("LAN4")
| | | |
+-----------+ +-----------+
The switch driver presents each port on the switch as a separate
network interface to Linux, polls the switch to maintain software
link state of those ports, forwards MII management interface
accesses to those network interfaces (e.g. as done by ethtool) to
the switch, and exposes the switch's hardware statistics counters
via the appropriate Linux kernel interfaces.
This initial patch supports the MII management interface register
layout of the Marvell 88E6123, 88E6161 and 88E6165 switch chips, and
supports the "Ethertype DSA" packet tagging format.
(There is no officially registered ethertype for the Ethertype DSA
packet format, so we just grab a random one. The ethertype to use
is programmed into the switch, and the switch driver uses the value
of ETH_P_EDSA for this, so this define can be changed at any time in
the future if the one we chose is allocated to another protocol or
if Ethertype DSA gets its own officially registered ethertype, and
everything will continue to work.)
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Nicolas Pitre <nico@marvell.com>
Tested-by: Byron Bradley <byron.bbradley@gmail.com>
Tested-by: Tim Ellis <tim.ellis@mac.com>
Tested-by: Peter van Valderen <linux@ddcrew.com>
Tested-by: Dirk Teurlings <dirk@upexia.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-10-07 21:44:02 +08:00
|
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|
*/
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#ifndef __LINUX_NET_DSA_H
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#define __LINUX_NET_DSA_H
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2017-02-08 07:03:05 +08:00
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#include <linux/if.h>
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2011-12-01 06:07:18 +08:00
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#include <linux/if_ether.h>
|
2011-11-28 01:06:08 +08:00
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#include <linux/list.h>
|
2017-02-04 02:20:20 +08:00
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#include <linux/notifier.h>
|
2011-11-25 22:32:52 +08:00
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#include <linux/timer.h>
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#include <linux/workqueue.h>
|
2014-08-28 08:04:49 +08:00
|
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#include <linux/of.h>
|
2014-10-18 07:02:13 +08:00
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#include <linux/ethtool.h>
|
2018-02-14 08:07:48 +08:00
|
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#include <linux/net_tstamp.h>
|
2018-05-11 04:17:32 +08:00
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#include <linux/phy.h>
|
2019-01-16 07:06:11 +08:00
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#include <linux/platform_data/dsa.h>
|
2019-05-29 01:38:12 +08:00
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#include <linux/phylink.h>
|
2017-03-29 05:45:07 +08:00
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#include <net/devlink.h>
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2017-05-18 03:46:04 +08:00
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#include <net/switchdev.h>
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2011-11-25 22:32:52 +08:00
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2017-01-31 04:41:40 +08:00
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struct tc_action;
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2017-02-08 07:03:05 +08:00
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struct phy_device;
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struct fixed_phy_status;
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2018-05-11 04:17:32 +08:00
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struct phylink_link_state;
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2017-01-31 04:41:40 +08:00
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2019-04-29 01:37:12 +08:00
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#define DSA_TAG_PROTO_NONE_VALUE 0
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#define DSA_TAG_PROTO_BRCM_VALUE 1
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#define DSA_TAG_PROTO_BRCM_PREPEND_VALUE 2
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#define DSA_TAG_PROTO_DSA_VALUE 3
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#define DSA_TAG_PROTO_EDSA_VALUE 4
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#define DSA_TAG_PROTO_GSWIP_VALUE 5
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#define DSA_TAG_PROTO_KSZ9477_VALUE 6
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#define DSA_TAG_PROTO_KSZ9893_VALUE 7
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#define DSA_TAG_PROTO_LAN9303_VALUE 8
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#define DSA_TAG_PROTO_MTK_VALUE 9
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#define DSA_TAG_PROTO_QCA_VALUE 10
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#define DSA_TAG_PROTO_TRAILER_VALUE 11
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net: dsa: Optional VLAN-based port separation for switches without tagging
This patch provides generic DSA code for using VLAN (802.1Q) tags for
the same purpose as a dedicated switch tag for injection/extraction.
It is based on the discussions and interest that has been so far
expressed in https://www.spinics.net/lists/netdev/msg556125.html.
Unlike all other DSA-supported tagging protocols, CONFIG_NET_DSA_TAG_8021Q
does not offer a complete solution for drivers (nor can it). Instead, it
provides generic code that driver can opt into calling:
- dsa_8021q_xmit: Inserts a VLAN header with the specified contents.
Can be called from another tagging protocol's xmit function.
Currently the LAN9303 driver is inserting headers that are simply
802.1Q with custom fields, so this is an opportunity for code reuse.
- dsa_8021q_rcv: Retrieves the TPID and TCI from a VLAN-tagged skb.
Removing the VLAN header is left as a decision for the caller to make.
- dsa_port_setup_8021q_tagging: For each user port, installs an Rx VID
and a Tx VID, for proper untagged traffic identification on ingress
and steering on egress. Also sets up the VLAN trunk on the upstream
(CPU or DSA) port. Drivers are intentionally left to call this
function explicitly, depending on the context and hardware support.
The expected switch behavior and VLAN semantics should not be violated
under any conditions. That is, after calling
dsa_port_setup_8021q_tagging, the hardware should still pass all
ingress traffic, be it tagged or untagged.
For uniformity with the other tagging protocols, a module for the
dsa_8021q_netdev_ops structure is registered, but the typical usage is
to set up another tagging protocol which selects CONFIG_NET_DSA_TAG_8021Q,
and calls the API from tag_8021q.h. Null function definitions are also
provided so that a "depends on" is not forced in the Kconfig.
This tagging protocol only works when switch ports are standalone, or
when they are added to a VLAN-unaware bridge. It will probably remain
this way for the reasons below.
When added to a bridge that has vlan_filtering 1, the bridge core will
install its own VLANs and reset the pvids through switchdev. For the
bridge core, switchdev is a write-only pipe. All VLAN-related state is
kept in the bridge core and nothing is read from DSA/switchdev or from
the driver. So the bridge core will break this port separation because
it will install the vlan_default_pvid into all switchdev ports.
Even if we could teach the bridge driver about switchdev preference of a
certain vlan_default_pvid (task difficult in itself since the current
setting is per-bridge but we would need it per-port), there would still
exist many other challenges.
Firstly, in the DSA rcv callback, a driver would have to perform an
iterative reverse lookup to find the correct switch port. That is
because the port is a bridge slave, so its Rx VID (port PVID) is subject
to user configuration. How would we ensure that the user doesn't reset
the pvid to a different value (which would make an O(1) translation
impossible), or to a non-unique value within this DSA switch tree (which
would make any translation impossible)?
Finally, not all switch ports are equal in DSA, and that makes it
difficult for the bridge to be completely aware of this anyway.
The CPU port needs to transmit tagged packets (VLAN trunk) in order for
the DSA rcv code to be able to decode source information.
But the bridge code has absolutely no idea which switch port is the CPU
port, if nothing else then just because there is no netdevice registered
by DSA for the CPU port.
Also DSA does not currently allow the user to specify that they want the
CPU port to do VLAN trunking anyway. VLANs are added to the CPU port
using the same flags as they were added on the user port.
So the VLANs installed by dsa_port_setup_8021q_tagging per driver
request should remain private from the bridge's and user's perspective,
and should not alter the VLAN semantics observed by the user.
In the current implementation a VLAN range ending at 4095 (VLAN_N_VID)
is reserved for this purpose. Each port receives a unique Rx VLAN and a
unique Tx VLAN. Separate VLANs are needed for Rx and Tx because they
serve different purposes: on Rx the switch must process traffic as
untagged and process it with a port-based VLAN, but with care not to
hinder bridging. On the other hand, the Tx VLAN is where the
reachability restrictions are imposed, since by tagging frames in the
xmit callback we are telling the switch onto which port to steer the
frame.
Some general guidance on how this support might be employed for
real-life hardware (some comments made by Florian Fainelli):
- If the hardware supports VLAN tag stacking, it should somehow back
up its private VLAN settings when the bridge tries to override them.
Then the driver could re-apply them as outer tags. Dedicating an outer
tag per bridge device would allow identical inner tag VID numbers to
co-exist, yet preserve broadcast domain isolation.
- If the switch cannot handle VLAN tag stacking, it should disable this
port separation when added as slave to a vlan_filtering bridge, in
that case having reduced functionality.
- Drivers for old switches that don't support the entire VLAN_N_VID
range will need to rework the current range selection mechanism.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-05 18:19:22 +08:00
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#define DSA_TAG_PROTO_8021Q_VALUE 12
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2019-05-05 18:19:27 +08:00
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#define DSA_TAG_PROTO_SJA1105_VALUE 13
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2019-07-30 01:49:46 +08:00
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#define DSA_TAG_PROTO_KSZ8795_VALUE 14
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2019-11-14 23:03:29 +08:00
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#define DSA_TAG_PROTO_OCELOT_VALUE 15
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2019-12-18 16:02:14 +08:00
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#define DSA_TAG_PROTO_AR9331_VALUE 16
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2020-07-08 20:25:36 +08:00
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#define DSA_TAG_PROTO_RTL4_A_VALUE 17
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2020-11-03 15:10:54 +08:00
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#define DSA_TAG_PROTO_HELLCREEK_VALUE 18
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2021-01-15 03:57:32 +08:00
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#define DSA_TAG_PROTO_XRS700X_VALUE 19
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2021-01-29 09:00:08 +08:00
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#define DSA_TAG_PROTO_OCELOT_8021Q_VALUE 20
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2019-04-29 01:37:12 +08:00
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2014-09-12 12:18:09 +08:00
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enum dsa_tag_protocol {
|
2019-04-29 01:37:12 +08:00
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DSA_TAG_PROTO_NONE = DSA_TAG_PROTO_NONE_VALUE,
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DSA_TAG_PROTO_BRCM = DSA_TAG_PROTO_BRCM_VALUE,
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DSA_TAG_PROTO_BRCM_PREPEND = DSA_TAG_PROTO_BRCM_PREPEND_VALUE,
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DSA_TAG_PROTO_DSA = DSA_TAG_PROTO_DSA_VALUE,
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DSA_TAG_PROTO_EDSA = DSA_TAG_PROTO_EDSA_VALUE,
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DSA_TAG_PROTO_GSWIP = DSA_TAG_PROTO_GSWIP_VALUE,
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DSA_TAG_PROTO_KSZ9477 = DSA_TAG_PROTO_KSZ9477_VALUE,
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DSA_TAG_PROTO_KSZ9893 = DSA_TAG_PROTO_KSZ9893_VALUE,
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DSA_TAG_PROTO_LAN9303 = DSA_TAG_PROTO_LAN9303_VALUE,
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DSA_TAG_PROTO_MTK = DSA_TAG_PROTO_MTK_VALUE,
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DSA_TAG_PROTO_QCA = DSA_TAG_PROTO_QCA_VALUE,
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DSA_TAG_PROTO_TRAILER = DSA_TAG_PROTO_TRAILER_VALUE,
|
net: dsa: Optional VLAN-based port separation for switches without tagging
This patch provides generic DSA code for using VLAN (802.1Q) tags for
the same purpose as a dedicated switch tag for injection/extraction.
It is based on the discussions and interest that has been so far
expressed in https://www.spinics.net/lists/netdev/msg556125.html.
Unlike all other DSA-supported tagging protocols, CONFIG_NET_DSA_TAG_8021Q
does not offer a complete solution for drivers (nor can it). Instead, it
provides generic code that driver can opt into calling:
- dsa_8021q_xmit: Inserts a VLAN header with the specified contents.
Can be called from another tagging protocol's xmit function.
Currently the LAN9303 driver is inserting headers that are simply
802.1Q with custom fields, so this is an opportunity for code reuse.
- dsa_8021q_rcv: Retrieves the TPID and TCI from a VLAN-tagged skb.
Removing the VLAN header is left as a decision for the caller to make.
- dsa_port_setup_8021q_tagging: For each user port, installs an Rx VID
and a Tx VID, for proper untagged traffic identification on ingress
and steering on egress. Also sets up the VLAN trunk on the upstream
(CPU or DSA) port. Drivers are intentionally left to call this
function explicitly, depending on the context and hardware support.
The expected switch behavior and VLAN semantics should not be violated
under any conditions. That is, after calling
dsa_port_setup_8021q_tagging, the hardware should still pass all
ingress traffic, be it tagged or untagged.
For uniformity with the other tagging protocols, a module for the
dsa_8021q_netdev_ops structure is registered, but the typical usage is
to set up another tagging protocol which selects CONFIG_NET_DSA_TAG_8021Q,
and calls the API from tag_8021q.h. Null function definitions are also
provided so that a "depends on" is not forced in the Kconfig.
This tagging protocol only works when switch ports are standalone, or
when they are added to a VLAN-unaware bridge. It will probably remain
this way for the reasons below.
When added to a bridge that has vlan_filtering 1, the bridge core will
install its own VLANs and reset the pvids through switchdev. For the
bridge core, switchdev is a write-only pipe. All VLAN-related state is
kept in the bridge core and nothing is read from DSA/switchdev or from
the driver. So the bridge core will break this port separation because
it will install the vlan_default_pvid into all switchdev ports.
Even if we could teach the bridge driver about switchdev preference of a
certain vlan_default_pvid (task difficult in itself since the current
setting is per-bridge but we would need it per-port), there would still
exist many other challenges.
Firstly, in the DSA rcv callback, a driver would have to perform an
iterative reverse lookup to find the correct switch port. That is
because the port is a bridge slave, so its Rx VID (port PVID) is subject
to user configuration. How would we ensure that the user doesn't reset
the pvid to a different value (which would make an O(1) translation
impossible), or to a non-unique value within this DSA switch tree (which
would make any translation impossible)?
Finally, not all switch ports are equal in DSA, and that makes it
difficult for the bridge to be completely aware of this anyway.
The CPU port needs to transmit tagged packets (VLAN trunk) in order for
the DSA rcv code to be able to decode source information.
But the bridge code has absolutely no idea which switch port is the CPU
port, if nothing else then just because there is no netdevice registered
by DSA for the CPU port.
Also DSA does not currently allow the user to specify that they want the
CPU port to do VLAN trunking anyway. VLANs are added to the CPU port
using the same flags as they were added on the user port.
So the VLANs installed by dsa_port_setup_8021q_tagging per driver
request should remain private from the bridge's and user's perspective,
and should not alter the VLAN semantics observed by the user.
In the current implementation a VLAN range ending at 4095 (VLAN_N_VID)
is reserved for this purpose. Each port receives a unique Rx VLAN and a
unique Tx VLAN. Separate VLANs are needed for Rx and Tx because they
serve different purposes: on Rx the switch must process traffic as
untagged and process it with a port-based VLAN, but with care not to
hinder bridging. On the other hand, the Tx VLAN is where the
reachability restrictions are imposed, since by tagging frames in the
xmit callback we are telling the switch onto which port to steer the
frame.
Some general guidance on how this support might be employed for
real-life hardware (some comments made by Florian Fainelli):
- If the hardware supports VLAN tag stacking, it should somehow back
up its private VLAN settings when the bridge tries to override them.
Then the driver could re-apply them as outer tags. Dedicating an outer
tag per bridge device would allow identical inner tag VID numbers to
co-exist, yet preserve broadcast domain isolation.
- If the switch cannot handle VLAN tag stacking, it should disable this
port separation when added as slave to a vlan_filtering bridge, in
that case having reduced functionality.
- Drivers for old switches that don't support the entire VLAN_N_VID
range will need to rework the current range selection mechanism.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-05 18:19:22 +08:00
|
|
|
DSA_TAG_PROTO_8021Q = DSA_TAG_PROTO_8021Q_VALUE,
|
2019-05-05 18:19:27 +08:00
|
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|
DSA_TAG_PROTO_SJA1105 = DSA_TAG_PROTO_SJA1105_VALUE,
|
2019-07-30 01:49:46 +08:00
|
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|
DSA_TAG_PROTO_KSZ8795 = DSA_TAG_PROTO_KSZ8795_VALUE,
|
2019-11-14 23:03:29 +08:00
|
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|
DSA_TAG_PROTO_OCELOT = DSA_TAG_PROTO_OCELOT_VALUE,
|
2019-12-18 16:02:14 +08:00
|
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|
DSA_TAG_PROTO_AR9331 = DSA_TAG_PROTO_AR9331_VALUE,
|
2020-07-08 20:25:36 +08:00
|
|
|
DSA_TAG_PROTO_RTL4_A = DSA_TAG_PROTO_RTL4_A_VALUE,
|
2020-11-03 15:10:54 +08:00
|
|
|
DSA_TAG_PROTO_HELLCREEK = DSA_TAG_PROTO_HELLCREEK_VALUE,
|
2021-01-15 03:57:32 +08:00
|
|
|
DSA_TAG_PROTO_XRS700X = DSA_TAG_PROTO_XRS700X_VALUE,
|
2021-01-29 09:00:08 +08:00
|
|
|
DSA_TAG_PROTO_OCELOT_8021Q = DSA_TAG_PROTO_OCELOT_8021Q_VALUE,
|
2014-09-12 12:18:09 +08:00
|
|
|
};
|
2014-08-28 08:04:55 +08:00
|
|
|
|
2014-09-16 01:00:19 +08:00
|
|
|
struct packet_type;
|
2018-02-14 08:07:49 +08:00
|
|
|
struct dsa_switch;
|
2014-08-28 08:04:46 +08:00
|
|
|
|
2017-08-09 20:41:16 +08:00
|
|
|
struct dsa_device_ops {
|
|
|
|
|
struct sk_buff *(*xmit)(struct sk_buff *skb, struct net_device *dev);
|
|
|
|
|
struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
|
2017-08-17 22:47:00 +08:00
|
|
|
struct packet_type *pt);
|
2020-09-27 03:32:05 +08:00
|
|
|
void (*flow_dissect)(const struct sk_buff *skb, __be16 *proto,
|
|
|
|
|
int *offset);
|
net: dsa: Allow drivers to filter packets they can decode source port from
Frames get processed by DSA and redirected to switch port net devices
based on the ETH_P_XDSA multiplexed packet_type handler found by the
network stack when calling eth_type_trans().
The running assumption is that once the DSA .rcv function is called, DSA
is always able to decode the switch tag in order to change the skb->dev
from its master.
However there are tagging protocols (such as the new DSA_TAG_PROTO_SJA1105,
user of DSA_TAG_PROTO_8021Q) where this assumption is not completely
true, since switch tagging piggybacks on the absence of a vlan_filtering
bridge. Moreover, management traffic (BPDU, PTP) for this switch doesn't
rely on switch tagging, but on a different mechanism. So it would make
sense to at least be able to terminate that.
Having DSA receive traffic it can't decode would put it in an impossible
situation: the eth_type_trans() function would invoke the DSA .rcv(),
which could not change skb->dev, then eth_type_trans() would be invoked
again, which again would call the DSA .rcv, and the packet would never
be able to exit the DSA filter and would spiral in a loop until the
whole system dies.
This happens because eth_type_trans() doesn't actually look at the skb
(so as to identify a potential tag) when it deems it as being
ETH_P_XDSA. It just checks whether skb->dev has a DSA private pointer
installed (therefore it's a DSA master) and that there exists a .rcv
callback (everybody except DSA_TAG_PROTO_NONE has that). This is
understandable as there are many switch tags out there, and exhaustively
checking for all of them is far from ideal.
The solution lies in introducing a filtering function for each tagging
protocol. In the absence of a filtering function, all traffic is passed
to the .rcv DSA callback. The tagging protocol should see the filtering
function as a pre-validation that it can decode the incoming skb. The
traffic that doesn't match the filter will bypass the DSA .rcv callback
and be left on the master netdevice, which wasn't previously possible.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-05 18:19:23 +08:00
|
|
|
/* Used to determine which traffic should match the DSA filter in
|
|
|
|
|
* eth_type_trans, and which, if any, should bypass it and be processed
|
|
|
|
|
* as regular on the master net device.
|
|
|
|
|
*/
|
|
|
|
|
bool (*filter)(const struct sk_buff *skb, struct net_device *dev);
|
2018-12-06 18:36:04 +08:00
|
|
|
unsigned int overhead;
|
2019-04-29 01:37:11 +08:00
|
|
|
const char *name;
|
2019-04-29 01:37:14 +08:00
|
|
|
enum dsa_tag_protocol proto;
|
2020-09-27 03:32:02 +08:00
|
|
|
/* Some tagging protocols either mangle or shift the destination MAC
|
|
|
|
|
* address, in which case the DSA master would drop packets on ingress
|
|
|
|
|
* if what it understands out of the destination MAC address is not in
|
|
|
|
|
* its RX filter.
|
|
|
|
|
*/
|
|
|
|
|
bool promisc_on_master;
|
2020-09-27 03:32:07 +08:00
|
|
|
bool tail_tag;
|
2017-08-09 20:41:16 +08:00
|
|
|
};
|
|
|
|
|
|
2020-07-20 11:49:52 +08:00
|
|
|
/* This structure defines the control interfaces that are overlayed by the
|
|
|
|
|
* DSA layer on top of the DSA CPU/management net_device instance. This is
|
|
|
|
|
* used by the core net_device layer while calling various net_device_ops
|
|
|
|
|
* function pointers.
|
|
|
|
|
*/
|
|
|
|
|
struct dsa_netdevice_ops {
|
|
|
|
|
int (*ndo_do_ioctl)(struct net_device *dev, struct ifreq *ifr,
|
|
|
|
|
int cmd);
|
|
|
|
|
};
|
|
|
|
|
|
2019-04-29 01:37:12 +08:00
|
|
|
#define DSA_TAG_DRIVER_ALIAS "dsa_tag-"
|
|
|
|
|
#define MODULE_ALIAS_DSA_TAG_DRIVER(__proto) \
|
|
|
|
|
MODULE_ALIAS(DSA_TAG_DRIVER_ALIAS __stringify(__proto##_VALUE))
|
|
|
|
|
|
2019-05-05 18:19:24 +08:00
|
|
|
struct dsa_skb_cb {
|
|
|
|
|
struct sk_buff *clone;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
struct __dsa_skb_cb {
|
|
|
|
|
struct dsa_skb_cb cb;
|
|
|
|
|
u8 priv[48 - sizeof(struct dsa_skb_cb)];
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
#define DSA_SKB_CB(skb) ((struct dsa_skb_cb *)((skb)->cb))
|
|
|
|
|
|
|
|
|
|
#define DSA_SKB_CB_PRIV(skb) \
|
|
|
|
|
((void *)(skb)->cb + offsetof(struct __dsa_skb_cb, priv))
|
|
|
|
|
|
2011-11-25 22:32:52 +08:00
|
|
|
struct dsa_switch_tree {
|
2016-06-05 03:17:07 +08:00
|
|
|
struct list_head list;
|
|
|
|
|
|
2017-02-04 02:20:20 +08:00
|
|
|
/* Notifier chain for switch-wide events */
|
|
|
|
|
struct raw_notifier_head nh;
|
|
|
|
|
|
2016-06-05 03:17:07 +08:00
|
|
|
/* Tree identifier */
|
2017-11-04 07:05:21 +08:00
|
|
|
unsigned int index;
|
2016-06-05 03:17:07 +08:00
|
|
|
|
|
|
|
|
/* Number of switches attached to this tree */
|
|
|
|
|
struct kref refcount;
|
|
|
|
|
|
|
|
|
|
/* Has this tree been applied to the hardware? */
|
2017-11-07 05:11:46 +08:00
|
|
|
bool setup;
|
2016-06-05 03:17:07 +08:00
|
|
|
|
net: dsa: keep a copy of the tagging protocol in the DSA switch tree
Cascading DSA switches can be done multiple ways. There is the brute
force approach / tag stacking, where one upstream switch, located
between leaf switches and the host Ethernet controller, will just
happily transport the DSA header of those leaf switches as payload.
For this kind of setups, DSA works without any special kind of treatment
compared to a single switch - they just aren't aware of each other.
Then there's the approach where the upstream switch understands the tags
it transports from its leaves below, as it doesn't push a tag of its own,
but it routes based on the source port & switch id information present
in that tag (as opposed to DMAC & VID) and it strips the tag when
egressing a front-facing port. Currently only Marvell implements the
latter, and Marvell DSA trees contain only Marvell switches.
So it is safe to say that DSA trees already have a single tag protocol
shared by all switches, and in fact this is what makes the switches able
to understand each other. This fact is also implied by the fact that
currently, the tagging protocol is reported as part of a sysfs installed
on the DSA master and not per port, so it must be the same for all the
ports connected to that DSA master regardless of the switch that they
belong to.
It's time to make this official and enforce it (yes, this also means we
won't have any "switch understands tag to some extent but is not able to
speak it" hardware oddities that we'll support in the future).
This is needed due to the imminent introduction of the dsa_switch_ops::
change_tag_protocol driver API. When that is introduced, we'll have
to notify switches of the tagging protocol that they're configured to
use. Currently the tag_ops structure pointer is held only for CPU ports.
But there are switches which don't have CPU ports and nonetheless still
need to be configured. These would be Marvell leaf switches whose
upstream port is just a DSA link. How do we inform these of their
tagging protocol setup/deletion?
One answer to the above would be: iterate through the DSA switch tree's
ports once, list the CPU ports, get their tag_ops, then iterate again
now that we have it, and notify everybody of that tag_ops. But what to
do if conflicts appear between one cpu_dp->tag_ops and another? There's
no escaping the fact that conflict resolution needs to be done, so we
can be upfront about it.
Ease our work and just keep the master copy of the tag_ops inside the
struct dsa_switch_tree. Reference counting is now moved to be per-tree
too, instead of per-CPU port.
There are many places in the data path that access master->dsa_ptr->tag_ops
and we would introduce unnecessary performance penalty going through yet
another indirection, so keep those right where they are.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-29 09:00:05 +08:00
|
|
|
/* Tagging protocol operations */
|
|
|
|
|
const struct dsa_device_ops *tag_ops;
|
|
|
|
|
|
2011-11-25 22:32:52 +08:00
|
|
|
/*
|
|
|
|
|
* Configuration data for the platform device that owns
|
|
|
|
|
* this dsa switch tree instance.
|
|
|
|
|
*/
|
|
|
|
|
struct dsa_platform_data *pd;
|
|
|
|
|
|
2019-10-22 04:51:16 +08:00
|
|
|
/* List of switch ports */
|
|
|
|
|
struct list_head ports;
|
|
|
|
|
|
2019-10-31 10:09:13 +08:00
|
|
|
/* List of DSA links composing the routing table */
|
|
|
|
|
struct list_head rtable;
|
2021-01-13 16:42:53 +08:00
|
|
|
|
|
|
|
|
/* Maps offloaded LAG netdevs to a zero-based linear ID for
|
|
|
|
|
* drivers that need it.
|
|
|
|
|
*/
|
|
|
|
|
struct net_device **lags;
|
|
|
|
|
unsigned int lags_len;
|
2011-11-25 22:32:52 +08:00
|
|
|
};
|
|
|
|
|
|
2021-01-13 16:42:53 +08:00
|
|
|
#define dsa_lags_foreach_id(_id, _dst) \
|
|
|
|
|
for ((_id) = 0; (_id) < (_dst)->lags_len; (_id)++) \
|
|
|
|
|
if ((_dst)->lags[(_id)])
|
|
|
|
|
|
|
|
|
|
#define dsa_lag_foreach_port(_dp, _dst, _lag) \
|
|
|
|
|
list_for_each_entry((_dp), &(_dst)->ports, list) \
|
|
|
|
|
if ((_dp)->lag_dev == (_lag))
|
|
|
|
|
|
2021-02-10 09:02:12 +08:00
|
|
|
#define dsa_hsr_foreach_port(_dp, _ds, _hsr) \
|
|
|
|
|
list_for_each_entry((_dp), &(_ds)->dst->ports, list) \
|
|
|
|
|
if ((_dp)->ds == (_ds) && (_dp)->hsr_dev == (_hsr))
|
|
|
|
|
|
2021-01-13 16:42:53 +08:00
|
|
|
static inline struct net_device *dsa_lag_dev(struct dsa_switch_tree *dst,
|
|
|
|
|
unsigned int id)
|
|
|
|
|
{
|
|
|
|
|
return dst->lags[id];
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline int dsa_lag_id(struct dsa_switch_tree *dst,
|
|
|
|
|
struct net_device *lag)
|
|
|
|
|
{
|
|
|
|
|
unsigned int id;
|
|
|
|
|
|
|
|
|
|
dsa_lags_foreach_id(id, dst) {
|
|
|
|
|
if (dsa_lag_dev(dst, id) == lag)
|
|
|
|
|
return id;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
}
|
|
|
|
|
|
2020-03-29 19:51:59 +08:00
|
|
|
/* TC matchall action types */
|
2017-01-31 04:41:40 +08:00
|
|
|
enum dsa_port_mall_action_type {
|
|
|
|
|
DSA_PORT_MALL_MIRROR,
|
2020-03-29 19:51:59 +08:00
|
|
|
DSA_PORT_MALL_POLICER,
|
2017-01-31 04:41:40 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
/* TC mirroring entry */
|
|
|
|
|
struct dsa_mall_mirror_tc_entry {
|
|
|
|
|
u8 to_local_port;
|
|
|
|
|
bool ingress;
|
|
|
|
|
};
|
|
|
|
|
|
2020-03-29 19:51:59 +08:00
|
|
|
/* TC port policer entry */
|
|
|
|
|
struct dsa_mall_policer_tc_entry {
|
2020-06-29 14:54:16 +08:00
|
|
|
u32 burst;
|
2020-03-29 19:51:59 +08:00
|
|
|
u64 rate_bytes_per_sec;
|
|
|
|
|
};
|
|
|
|
|
|
2017-01-31 04:41:40 +08:00
|
|
|
/* TC matchall entry */
|
|
|
|
|
struct dsa_mall_tc_entry {
|
|
|
|
|
struct list_head list;
|
|
|
|
|
unsigned long cookie;
|
|
|
|
|
enum dsa_port_mall_action_type type;
|
|
|
|
|
union {
|
|
|
|
|
struct dsa_mall_mirror_tc_entry mirror;
|
2020-03-29 19:51:59 +08:00
|
|
|
struct dsa_mall_policer_tc_entry policer;
|
2017-01-31 04:41:40 +08:00
|
|
|
};
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
2016-06-05 03:16:57 +08:00
|
|
|
struct dsa_port {
|
2017-10-16 23:12:18 +08:00
|
|
|
/* A CPU port is physically connected to a master device.
|
|
|
|
|
* A user port exposed to userspace has a slave device.
|
|
|
|
|
*/
|
|
|
|
|
union {
|
|
|
|
|
struct net_device *master;
|
|
|
|
|
struct net_device *slave;
|
|
|
|
|
};
|
|
|
|
|
|
net: dsa: keep a copy of the tagging protocol in the DSA switch tree
Cascading DSA switches can be done multiple ways. There is the brute
force approach / tag stacking, where one upstream switch, located
between leaf switches and the host Ethernet controller, will just
happily transport the DSA header of those leaf switches as payload.
For this kind of setups, DSA works without any special kind of treatment
compared to a single switch - they just aren't aware of each other.
Then there's the approach where the upstream switch understands the tags
it transports from its leaves below, as it doesn't push a tag of its own,
but it routes based on the source port & switch id information present
in that tag (as opposed to DMAC & VID) and it strips the tag when
egressing a front-facing port. Currently only Marvell implements the
latter, and Marvell DSA trees contain only Marvell switches.
So it is safe to say that DSA trees already have a single tag protocol
shared by all switches, and in fact this is what makes the switches able
to understand each other. This fact is also implied by the fact that
currently, the tagging protocol is reported as part of a sysfs installed
on the DSA master and not per port, so it must be the same for all the
ports connected to that DSA master regardless of the switch that they
belong to.
It's time to make this official and enforce it (yes, this also means we
won't have any "switch understands tag to some extent but is not able to
speak it" hardware oddities that we'll support in the future).
This is needed due to the imminent introduction of the dsa_switch_ops::
change_tag_protocol driver API. When that is introduced, we'll have
to notify switches of the tagging protocol that they're configured to
use. Currently the tag_ops structure pointer is held only for CPU ports.
But there are switches which don't have CPU ports and nonetheless still
need to be configured. These would be Marvell leaf switches whose
upstream port is just a DSA link. How do we inform these of their
tagging protocol setup/deletion?
One answer to the above would be: iterate through the DSA switch tree's
ports once, list the CPU ports, get their tag_ops, then iterate again
now that we have it, and notify everybody of that tag_ops. But what to
do if conflicts appear between one cpu_dp->tag_ops and another? There's
no escaping the fact that conflict resolution needs to be done, so we
can be upfront about it.
Ease our work and just keep the master copy of the tag_ops inside the
struct dsa_switch_tree. Reference counting is now moved to be per-tree
too, instead of per-CPU port.
There are many places in the data path that access master->dsa_ptr->tag_ops
and we would introduce unnecessary performance penalty going through yet
another indirection, so keep those right where they are.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-29 09:00:05 +08:00
|
|
|
/* Copy of the tagging protocol operations, for quicker access
|
|
|
|
|
* in the data path. Valid only for the CPU ports.
|
|
|
|
|
*/
|
2017-09-30 05:19:18 +08:00
|
|
|
const struct dsa_device_ops *tag_ops;
|
|
|
|
|
|
2017-09-30 05:19:19 +08:00
|
|
|
/* Copies for faster access in master receive hot path */
|
|
|
|
|
struct dsa_switch_tree *dst;
|
|
|
|
|
struct sk_buff *(*rcv)(struct sk_buff *skb, struct net_device *dev,
|
|
|
|
|
struct packet_type *pt);
|
net: dsa: Allow drivers to filter packets they can decode source port from
Frames get processed by DSA and redirected to switch port net devices
based on the ETH_P_XDSA multiplexed packet_type handler found by the
network stack when calling eth_type_trans().
The running assumption is that once the DSA .rcv function is called, DSA
is always able to decode the switch tag in order to change the skb->dev
from its master.
However there are tagging protocols (such as the new DSA_TAG_PROTO_SJA1105,
user of DSA_TAG_PROTO_8021Q) where this assumption is not completely
true, since switch tagging piggybacks on the absence of a vlan_filtering
bridge. Moreover, management traffic (BPDU, PTP) for this switch doesn't
rely on switch tagging, but on a different mechanism. So it would make
sense to at least be able to terminate that.
Having DSA receive traffic it can't decode would put it in an impossible
situation: the eth_type_trans() function would invoke the DSA .rcv(),
which could not change skb->dev, then eth_type_trans() would be invoked
again, which again would call the DSA .rcv, and the packet would never
be able to exit the DSA filter and would spiral in a loop until the
whole system dies.
This happens because eth_type_trans() doesn't actually look at the skb
(so as to identify a potential tag) when it deems it as being
ETH_P_XDSA. It just checks whether skb->dev has a DSA private pointer
installed (therefore it's a DSA master) and that there exists a .rcv
callback (everybody except DSA_TAG_PROTO_NONE has that). This is
understandable as there are many switch tags out there, and exhaustively
checking for all of them is far from ideal.
The solution lies in introducing a filtering function for each tagging
protocol. In the absence of a filtering function, all traffic is passed
to the .rcv DSA callback. The tagging protocol should see the filtering
function as a pre-validation that it can decode the incoming skb. The
traffic that doesn't match the filter will bypass the DSA .rcv callback
and be left on the master netdevice, which wasn't previously possible.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-05 18:19:23 +08:00
|
|
|
bool (*filter)(const struct sk_buff *skb, struct net_device *dev);
|
2017-09-30 05:19:19 +08:00
|
|
|
|
2017-10-26 23:22:57 +08:00
|
|
|
enum {
|
|
|
|
|
DSA_PORT_TYPE_UNUSED = 0,
|
|
|
|
|
DSA_PORT_TYPE_CPU,
|
|
|
|
|
DSA_PORT_TYPE_DSA,
|
|
|
|
|
DSA_PORT_TYPE_USER,
|
|
|
|
|
} type;
|
|
|
|
|
|
2017-01-28 04:29:38 +08:00
|
|
|
struct dsa_switch *ds;
|
|
|
|
|
unsigned int index;
|
2017-02-05 05:02:43 +08:00
|
|
|
const char *name;
|
2019-06-15 01:49:20 +08:00
|
|
|
struct dsa_port *cpu_dp;
|
2019-03-29 13:34:58 +08:00
|
|
|
const char *mac;
|
2016-06-05 03:16:58 +08:00
|
|
|
struct device_node *dn;
|
2016-07-19 08:45:38 +08:00
|
|
|
unsigned int ageing_time;
|
2019-04-29 02:45:43 +08:00
|
|
|
bool vlan_filtering;
|
2016-09-23 04:49:22 +08:00
|
|
|
u8 stp_state;
|
2017-01-28 04:29:40 +08:00
|
|
|
struct net_device *bridge_dev;
|
2017-03-29 05:45:07 +08:00
|
|
|
struct devlink_port devlink_port;
|
2020-10-05 00:12:53 +08:00
|
|
|
bool devlink_port_setup;
|
2018-05-11 04:17:36 +08:00
|
|
|
struct phylink *pl;
|
2019-05-29 01:38:12 +08:00
|
|
|
struct phylink_config pl_config;
|
2021-01-13 16:42:53 +08:00
|
|
|
struct net_device *lag_dev;
|
|
|
|
|
bool lag_tx_enabled;
|
2021-02-10 09:02:12 +08:00
|
|
|
struct net_device *hsr_dev;
|
2019-05-05 18:19:25 +08:00
|
|
|
|
2019-10-22 04:51:16 +08:00
|
|
|
struct list_head list;
|
|
|
|
|
|
2019-05-05 18:19:26 +08:00
|
|
|
/*
|
|
|
|
|
* Give the switch driver somewhere to hang its per-port private data
|
|
|
|
|
* structures (accessible from the tagger).
|
|
|
|
|
*/
|
|
|
|
|
void *priv;
|
|
|
|
|
|
2017-06-14 04:27:20 +08:00
|
|
|
/*
|
|
|
|
|
* Original copy of the master netdev ethtool_ops
|
|
|
|
|
*/
|
|
|
|
|
const struct ethtool_ops *orig_ethtool_ops;
|
2019-01-16 06:43:04 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Original copy of the master netdev net_device_ops
|
|
|
|
|
*/
|
2020-07-20 11:49:52 +08:00
|
|
|
const struct dsa_netdevice_ops *netdev_ops;
|
2019-10-22 04:51:19 +08:00
|
|
|
|
|
|
|
|
bool setup;
|
2016-06-05 03:16:57 +08:00
|
|
|
};
|
|
|
|
|
|
2019-10-31 10:09:13 +08:00
|
|
|
/* TODO: ideally DSA ports would have a single dp->link_dp member,
|
|
|
|
|
* and no dst->rtable nor this struct dsa_link would be needed,
|
|
|
|
|
* but this would require some more complex tree walking,
|
|
|
|
|
* so keep it stupid at the moment and list them all.
|
|
|
|
|
*/
|
|
|
|
|
struct dsa_link {
|
|
|
|
|
struct dsa_port *dp;
|
|
|
|
|
struct dsa_port *link_dp;
|
|
|
|
|
struct list_head list;
|
|
|
|
|
};
|
|
|
|
|
|
2011-11-28 01:06:08 +08:00
|
|
|
struct dsa_switch {
|
2019-10-22 04:51:19 +08:00
|
|
|
bool setup;
|
|
|
|
|
|
2016-05-11 05:27:23 +08:00
|
|
|
struct device *dev;
|
|
|
|
|
|
2011-11-28 01:06:08 +08:00
|
|
|
/*
|
|
|
|
|
* Parent switch tree, and switch index.
|
|
|
|
|
*/
|
|
|
|
|
struct dsa_switch_tree *dst;
|
2017-11-04 07:05:20 +08:00
|
|
|
unsigned int index;
|
2011-11-28 01:06:08 +08:00
|
|
|
|
2017-02-04 02:20:20 +08:00
|
|
|
/* Listener for switch fabric events */
|
|
|
|
|
struct notifier_block nb;
|
|
|
|
|
|
2016-04-13 08:40:40 +08:00
|
|
|
/*
|
|
|
|
|
* Give the switch driver somewhere to hang its private data
|
|
|
|
|
* structure.
|
|
|
|
|
*/
|
|
|
|
|
void *priv;
|
|
|
|
|
|
2011-11-28 01:06:08 +08:00
|
|
|
/*
|
|
|
|
|
* Configuration data for this switch.
|
|
|
|
|
*/
|
2016-05-11 05:27:24 +08:00
|
|
|
struct dsa_chip_data *cd;
|
2011-11-28 01:06:08 +08:00
|
|
|
|
|
|
|
|
/*
|
2016-08-24 00:38:56 +08:00
|
|
|
* The switch operations.
|
2011-11-28 01:06:08 +08:00
|
|
|
*/
|
2017-01-09 06:52:08 +08:00
|
|
|
const struct dsa_switch_ops *ops;
|
2011-11-28 01:06:08 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Slave mii_bus and devices for the individual ports.
|
|
|
|
|
*/
|
2014-08-28 08:04:51 +08:00
|
|
|
u32 phys_mii_mask;
|
2011-11-28 01:06:08 +08:00
|
|
|
struct mii_bus *slave_mii_bus;
|
2017-01-28 04:29:36 +08:00
|
|
|
|
2017-03-16 03:53:49 +08:00
|
|
|
/* Ageing Time limits in msecs */
|
|
|
|
|
unsigned int ageing_time_min;
|
|
|
|
|
unsigned int ageing_time_max;
|
|
|
|
|
|
2017-03-29 05:45:07 +08:00
|
|
|
/* devlink used to represent this switch device */
|
|
|
|
|
struct devlink *devlink;
|
|
|
|
|
|
2017-09-04 11:27:00 +08:00
|
|
|
/* Number of switch port queues */
|
|
|
|
|
unsigned int num_tx_queues;
|
|
|
|
|
|
2019-04-29 02:45:44 +08:00
|
|
|
/* Disallow bridge core from requesting different VLAN awareness
|
|
|
|
|
* settings on ports if not hardware-supported
|
|
|
|
|
*/
|
|
|
|
|
bool vlan_filtering_is_global;
|
|
|
|
|
|
2020-05-13 01:20:25 +08:00
|
|
|
/* Pass .port_vlan_add and .port_vlan_del to drivers even for bridges
|
|
|
|
|
* that have vlan_filtering=0. All drivers should ideally set this (and
|
|
|
|
|
* then the option would get removed), but it is unknown whether this
|
|
|
|
|
* would break things or not.
|
|
|
|
|
*/
|
|
|
|
|
bool configure_vlan_while_not_filtering;
|
|
|
|
|
|
2020-10-02 10:42:12 +08:00
|
|
|
/* If the switch driver always programs the CPU port as egress tagged
|
|
|
|
|
* despite the VLAN configuration indicating otherwise, then setting
|
|
|
|
|
* @untag_bridge_pvid will force the DSA receive path to pop the bridge's
|
|
|
|
|
* default_pvid VLAN tagged frames to offer a consistent behavior
|
|
|
|
|
* between a vlan_filtering=0 and vlan_filtering=1 bridge device.
|
|
|
|
|
*/
|
|
|
|
|
bool untag_bridge_pvid;
|
|
|
|
|
|
net: dsa: listen for SWITCHDEV_{FDB,DEL}_ADD_TO_DEVICE on foreign bridge neighbors
Some DSA switches (and not only) cannot learn source MAC addresses from
packets injected from the CPU. They only perform hardware address
learning from inbound traffic.
This can be problematic when we have a bridge spanning some DSA switch
ports and some non-DSA ports (which we'll call "foreign interfaces" from
DSA's perspective).
There are 2 classes of problems created by the lack of learning on
CPU-injected traffic:
- excessive flooding, due to the fact that DSA treats those addresses as
unknown
- the risk of stale routes, which can lead to temporary packet loss
To illustrate the second class, consider the following situation, which
is common in production equipment (wireless access points, where there
is a WLAN interface and an Ethernet switch, and these form a single
bridging domain).
AP 1:
+------------------------------------------------------------------------+
| br0 |
+------------------------------------------------------------------------+
+------------+ +------------+ +------------+ +------------+ +------------+
| swp0 | | swp1 | | swp2 | | swp3 | | wlan0 |
+------------+ +------------+ +------------+ +------------+ +------------+
| ^ ^
| | |
| | |
| Client A Client B
|
|
|
+------------+ +------------+ +------------+ +------------+ +------------+
| swp0 | | swp1 | | swp2 | | swp3 | | wlan0 |
+------------+ +------------+ +------------+ +------------+ +------------+
+------------------------------------------------------------------------+
| br0 |
+------------------------------------------------------------------------+
AP 2
- br0 of AP 1 will know that Clients A and B are reachable via wlan0
- the hardware fdb of a DSA switch driver today is not kept in sync with
the software entries on other bridge ports, so it will not know that
clients A and B are reachable via the CPU port UNLESS the hardware
switch itself performs SA learning from traffic injected from the CPU.
Nonetheless, a substantial number of switches don't.
- the hardware fdb of the DSA switch on AP 2 may autonomously learn that
Client A and B are reachable through swp0. Therefore, the software br0
of AP 2 also may or may not learn this. In the example we're
illustrating, some Ethernet traffic has been going on, and br0 from AP
2 has indeed learnt that it can reach Client B through swp0.
One of the wireless clients, say Client B, disconnects from AP 1 and
roams to AP 2. The topology now looks like this:
AP 1:
+------------------------------------------------------------------------+
| br0 |
+------------------------------------------------------------------------+
+------------+ +------------+ +------------+ +------------+ +------------+
| swp0 | | swp1 | | swp2 | | swp3 | | wlan0 |
+------------+ +------------+ +------------+ +------------+ +------------+
| ^
| |
| Client A
|
|
| Client B
| |
| v
+------------+ +------------+ +------------+ +------------+ +------------+
| swp0 | | swp1 | | swp2 | | swp3 | | wlan0 |
+------------+ +------------+ +------------+ +------------+ +------------+
+------------------------------------------------------------------------+
| br0 |
+------------------------------------------------------------------------+
AP 2
- br0 of AP 1 still knows that Client A is reachable via wlan0 (no change)
- br0 of AP 1 will (possibly) know that Client B has left wlan0. There
are cases where it might never find out though. Either way, DSA today
does not process that notification in any way.
- the hardware FDB of the DSA switch on AP 1 may learn autonomously that
Client B can be reached via swp0, if it receives any packet with
Client 1's source MAC address over Ethernet.
- the hardware FDB of the DSA switch on AP 2 still thinks that Client B
can be reached via swp0. It does not know that it has roamed to wlan0,
because it doesn't perform SA learning from the CPU port.
Now Client A contacts Client B.
AP 1 routes the packet fine towards swp0 and delivers it on the Ethernet
segment.
AP 2 sees a frame on swp0 and its fdb says that the destination is swp0.
Hairpinning is disabled => drop.
This problem comes from the fact that these switches have a 'blind spot'
for addresses coming from software bridging. The generic solution is not
to assume that hardware learning can be enabled somehow, but to listen
to more bridge learning events. It turns out that the bridge driver does
learn in software from all inbound frames, in __br_handle_local_finish.
A proper SWITCHDEV_FDB_ADD_TO_DEVICE notification is emitted for the
addresses serviced by the bridge on 'foreign' interfaces. The software
bridge also does the right thing on migration, by notifying that the old
entry is deleted, so that does not need to be special-cased in DSA. When
it is deleted, we just need to delete our static FDB entry towards the
CPU too, and wait.
The problem is that DSA currently only cares about SWITCHDEV_FDB_ADD_TO_DEVICE
events received on its own interfaces, such as static FDB entries.
Luckily we can change that, and DSA can listen to all switchdev FDB
add/del events in the system and figure out if those events were emitted
by a bridge that spans at least one of DSA's own ports. In case that is
true, DSA will also offload that address towards its own CPU port, in
the eventuality that there might be bridge clients attached to the DSA
switch who want to talk to the station connected to the foreign
interface.
In terms of implementation, we need to keep the fdb_info->added_by_user
check for the case where the switchdev event was targeted directly at a
DSA switch port. But we don't need to look at that flag for snooped
events. So the check is currently too late, we need to move it earlier.
This also simplifies the code a bit, since we avoid uselessly allocating
and freeing switchdev_work.
We could probably do some improvements in the future. For example,
multi-bridge support is rudimentary at the moment. If there are two
bridges spanning a DSA switch's ports, and both of them need to service
the same MAC address, then what will happen is that the migration of one
of those stations will trigger the deletion of the FDB entry from the
CPU port while it is still used by other bridge. That could be improved
with reference counting but is left for another time.
This behavior needs to be enabled at driver level by setting
ds->assisted_learning_on_cpu_port = true. This is because we don't want
to inflict a potential performance penalty (accesses through
MDIO/I2C/SPI are expensive) to hardware that really doesn't need it
because address learning on the CPU port works there.
Reported-by: DENG Qingfang <dqfext@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-06 17:51:35 +08:00
|
|
|
/* Let DSA manage the FDB entries towards the CPU, based on the
|
|
|
|
|
* software bridge database.
|
|
|
|
|
*/
|
|
|
|
|
bool assisted_learning_on_cpu_port;
|
|
|
|
|
|
2019-04-29 02:45:48 +08:00
|
|
|
/* In case vlan_filtering_is_global is set, the VLAN awareness state
|
|
|
|
|
* should be retrieved from here and not from the per-port settings.
|
|
|
|
|
*/
|
|
|
|
|
bool vlan_filtering;
|
|
|
|
|
|
2020-01-06 09:34:12 +08:00
|
|
|
/* MAC PCS does not provide link state change interrupt, and requires
|
|
|
|
|
* polling. Flag passed on to PHYLINK.
|
|
|
|
|
*/
|
|
|
|
|
bool pcs_poll;
|
|
|
|
|
|
net: dsa: implement auto-normalization of MTU for bridge hardware datapath
Many switches don't have an explicit knob for configuring the MTU
(maximum transmission unit per interface). Instead, they do the
length-based packet admission checks on the ingress interface, for
reasons that are easy to understand (why would you accept a packet in
the queuing subsystem if you know you're going to drop it anyway).
So it is actually the MRU that these switches permit configuring.
In Linux there only exists the IFLA_MTU netlink attribute and the
associated dev_set_mtu function. The comments like to play blind and say
that it's changing the "maximum transfer unit", which is to say that
there isn't any directionality in the meaning of the MTU word. So that
is the interpretation that this patch is giving to things: MTU == MRU.
When 2 interfaces having different MTUs are bridged, the bridge driver
MTU auto-adjustment logic kicks in: what br_mtu_auto_adjust() does is it
adjusts the MTU of the bridge net device itself (and not that of the
slave net devices) to the minimum value of all slave interfaces, in
order for forwarded packets to not exceed the MTU regardless of the
interface they are received and send on.
The idea behind this behavior, and why the slave MTUs are not adjusted,
is that normal termination from Linux over the L2 forwarding domain
should happen over the bridge net device, which _is_ properly limited by
the minimum MTU. And termination over individual slave devices is
possible even if those are bridged. But that is not "forwarding", so
there's no reason to do normalization there, since only a single
interface sees that packet.
The problem with those switches that can only control the MRU is with
the offloaded data path, where a packet received on an interface with
MRU 9000 would still be forwarded to an interface with MRU 1500. And the
br_mtu_auto_adjust() function does not really help, since the MTU
configured on the bridge net device is ignored.
In order to enforce the de-facto MTU == MRU rule for these switches, we
need to do MTU normalization, which means: in order for no packet larger
than the MTU configured on this port to be sent, then we need to limit
the MRU on all ports that this packet could possibly come from. AKA
since we are configuring the MRU via MTU, it means that all ports within
a bridge forwarding domain should have the same MTU.
And that is exactly what this patch is trying to do.
>From an implementation perspective, we try to follow the intent of the
user, otherwise there is a risk that we might livelock them (they try to
change the MTU on an already-bridged interface, but we just keep
changing it back in an attempt to keep the MTU normalized). So the MTU
that the bridge is normalized to is either:
- The most recently changed one:
ip link set dev swp0 master br0
ip link set dev swp1 master br0
ip link set dev swp0 mtu 1400
This sequence will make swp1 inherit MTU 1400 from swp0.
- The one of the most recently added interface to the bridge:
ip link set dev swp0 master br0
ip link set dev swp1 mtu 1400
ip link set dev swp1 master br0
The above sequence will make swp0 inherit MTU 1400 as well.
Suggested-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>
2020-03-28 03:55:43 +08:00
|
|
|
/* For switches that only have the MRU configurable. To ensure the
|
|
|
|
|
* configured MTU is not exceeded, normalization of MRU on all bridged
|
|
|
|
|
* interfaces is needed.
|
|
|
|
|
*/
|
|
|
|
|
bool mtu_enforcement_ingress;
|
|
|
|
|
|
2021-01-13 16:42:53 +08:00
|
|
|
/* Drivers that benefit from having an ID associated with each
|
|
|
|
|
* offloaded LAG should set this to the maximum number of
|
|
|
|
|
* supported IDs. DSA will then maintain a mapping of _at
|
|
|
|
|
* least_ these many IDs, accessible to drivers via
|
|
|
|
|
* dsa_lag_id().
|
|
|
|
|
*/
|
|
|
|
|
unsigned int num_lag_ids;
|
|
|
|
|
|
2017-01-28 04:29:36 +08:00
|
|
|
size_t num_ports;
|
2011-11-28 01:06:08 +08:00
|
|
|
};
|
|
|
|
|
|
2019-10-22 04:51:15 +08:00
|
|
|
static inline struct dsa_port *dsa_to_port(struct dsa_switch *ds, int p)
|
2017-10-26 23:22:51 +08:00
|
|
|
{
|
2019-10-22 04:51:17 +08:00
|
|
|
struct dsa_switch_tree *dst = ds->dst;
|
2019-10-26 02:48:53 +08:00
|
|
|
struct dsa_port *dp;
|
2019-10-22 04:51:17 +08:00
|
|
|
|
|
|
|
|
list_for_each_entry(dp, &dst->ports, list)
|
|
|
|
|
if (dp->ds == ds && dp->index == p)
|
2019-10-26 02:48:53 +08:00
|
|
|
return dp;
|
2019-10-22 04:51:17 +08:00
|
|
|
|
2019-10-26 02:48:53 +08:00
|
|
|
return NULL;
|
2017-10-26 23:22:58 +08:00
|
|
|
}
|
2017-10-26 23:22:51 +08:00
|
|
|
|
2017-10-26 23:22:58 +08:00
|
|
|
static inline bool dsa_is_unused_port(struct dsa_switch *ds, int p)
|
|
|
|
|
{
|
|
|
|
|
return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_UNUSED;
|
2017-10-26 23:22:51 +08:00
|
|
|
}
|
|
|
|
|
|
2011-11-28 01:06:08 +08:00
|
|
|
static inline bool dsa_is_cpu_port(struct dsa_switch *ds, int p)
|
|
|
|
|
{
|
2017-10-26 23:22:58 +08:00
|
|
|
return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_CPU;
|
2011-11-28 01:06:08 +08:00
|
|
|
}
|
|
|
|
|
|
2015-08-18 05:52:51 +08:00
|
|
|
static inline bool dsa_is_dsa_port(struct dsa_switch *ds, int p)
|
|
|
|
|
{
|
2017-10-26 23:22:58 +08:00
|
|
|
return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_DSA;
|
2015-08-18 05:52:51 +08:00
|
|
|
}
|
|
|
|
|
|
2017-10-26 23:22:54 +08:00
|
|
|
static inline bool dsa_is_user_port(struct dsa_switch *ds, int p)
|
2017-03-12 05:12:58 +08:00
|
|
|
{
|
2017-10-26 23:22:58 +08:00
|
|
|
return dsa_to_port(ds, p)->type == DSA_PORT_TYPE_USER;
|
2017-03-12 05:12:58 +08:00
|
|
|
}
|
|
|
|
|
|
2017-10-26 23:22:56 +08:00
|
|
|
static inline u32 dsa_user_ports(struct dsa_switch *ds)
|
|
|
|
|
{
|
2017-10-26 23:22:58 +08:00
|
|
|
u32 mask = 0;
|
|
|
|
|
int p;
|
2017-10-26 23:22:56 +08:00
|
|
|
|
2017-10-26 23:22:58 +08:00
|
|
|
for (p = 0; p < ds->num_ports; p++)
|
|
|
|
|
if (dsa_is_user_port(ds, p))
|
|
|
|
|
mask |= BIT(p);
|
|
|
|
|
|
|
|
|
|
return mask;
|
2017-10-16 23:12:19 +08:00
|
|
|
}
|
|
|
|
|
|
2019-10-31 10:09:13 +08:00
|
|
|
/* Return the local port used to reach an arbitrary switch device */
|
|
|
|
|
static inline unsigned int dsa_routing_port(struct dsa_switch *ds, int device)
|
|
|
|
|
{
|
|
|
|
|
struct dsa_switch_tree *dst = ds->dst;
|
|
|
|
|
struct dsa_link *dl;
|
|
|
|
|
|
|
|
|
|
list_for_each_entry(dl, &dst->rtable, list)
|
|
|
|
|
if (dl->dp->ds == ds && dl->link_dp->ds->index == device)
|
|
|
|
|
return dl->dp->index;
|
|
|
|
|
|
|
|
|
|
return ds->num_ports;
|
|
|
|
|
}
|
|
|
|
|
|
2017-12-01 01:56:42 +08:00
|
|
|
/* Return the local port used to reach an arbitrary switch port */
|
|
|
|
|
static inline unsigned int dsa_towards_port(struct dsa_switch *ds, int device,
|
|
|
|
|
int port)
|
|
|
|
|
{
|
|
|
|
|
if (device == ds->index)
|
|
|
|
|
return port;
|
|
|
|
|
else
|
2019-10-31 10:09:13 +08:00
|
|
|
return dsa_routing_port(ds, device);
|
2017-12-01 01:56:42 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Return the local port used to reach the dedicated CPU port */
|
2017-12-06 04:34:13 +08:00
|
|
|
static inline unsigned int dsa_upstream_port(struct dsa_switch *ds, int port)
|
2011-11-28 01:06:08 +08:00
|
|
|
{
|
2017-12-06 04:34:13 +08:00
|
|
|
const struct dsa_port *dp = dsa_to_port(ds, port);
|
|
|
|
|
const struct dsa_port *cpu_dp = dp->cpu_dp;
|
|
|
|
|
|
|
|
|
|
if (!cpu_dp)
|
|
|
|
|
return port;
|
2011-11-28 01:06:08 +08:00
|
|
|
|
2017-12-01 01:56:42 +08:00
|
|
|
return dsa_towards_port(ds, cpu_dp->ds->index, cpu_dp->index);
|
2011-11-28 01:06:08 +08:00
|
|
|
}
|
|
|
|
|
|
2019-04-29 02:45:49 +08:00
|
|
|
static inline bool dsa_port_is_vlan_filtering(const struct dsa_port *dp)
|
|
|
|
|
{
|
|
|
|
|
const struct dsa_switch *ds = dp->ds;
|
|
|
|
|
|
|
|
|
|
if (ds->vlan_filtering_is_global)
|
|
|
|
|
return ds->vlan_filtering;
|
|
|
|
|
else
|
|
|
|
|
return dp->vlan_filtering;
|
|
|
|
|
}
|
|
|
|
|
|
2017-08-06 21:15:49 +08:00
|
|
|
typedef int dsa_fdb_dump_cb_t(const unsigned char *addr, u16 vid,
|
|
|
|
|
bool is_static, void *data);
|
2016-08-24 00:38:56 +08:00
|
|
|
struct dsa_switch_ops {
|
net: dsa: allow changing the tag protocol via the "tagging" device attribute
Currently DSA exposes the following sysfs:
$ cat /sys/class/net/eno2/dsa/tagging
ocelot
which is a read-only device attribute, introduced in the kernel as
commit 98cdb4807123 ("net: dsa: Expose tagging protocol to user-space"),
and used by libpcap since its commit 993db3800d7d ("Add support for DSA
link-layer types").
It would be nice if we could extend this device attribute by making it
writable:
$ echo ocelot-8021q > /sys/class/net/eno2/dsa/tagging
This is useful with DSA switches that can make use of more than one
tagging protocol. It may be useful in dsa_loop in the future too, to
perform offline testing of various taggers, or for changing between dsa
and edsa on Marvell switches, if that is desirable.
In terms of implementation, drivers can support this feature by
implementing .change_tag_protocol, which should always leave the switch
in a consistent state: either with the new protocol if things went well,
or with the old one if something failed. Teardown of the old protocol,
if necessary, must be handled by the driver.
Some things remain as before:
- The .get_tag_protocol is currently only called at probe time, to load
the initial tagging protocol driver. Nonetheless, new drivers should
report the tagging protocol in current use now.
- The driver should manage by itself the initial setup of tagging
protocol, no later than the .setup() method, as well as destroying
resources used by the last tagger in use, no earlier than the
.teardown() method.
For multi-switch DSA trees, error handling is a bit more complicated,
since e.g. the 5th out of 7 switches may fail to change the tag
protocol. When that happens, a revert to the original tag protocol is
attempted, but that may fail too, leaving the tree in an inconsistent
state despite each individual switch implementing .change_tag_protocol
transactionally. Since the intersection between drivers that implement
.change_tag_protocol and drivers that support D in DSA is currently the
empty set, the possibility for this error to happen is ignored for now.
Testing:
$ insmod mscc_felix.ko
[ 79.549784] mscc_felix 0000:00:00.5: Adding to iommu group 14
[ 79.565712] mscc_felix 0000:00:00.5: Failed to register DSA switch: -517
$ insmod tag_ocelot.ko
$ rmmod mscc_felix.ko
$ insmod mscc_felix.ko
[ 97.261724] libphy: VSC9959 internal MDIO bus: probed
[ 97.267363] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 0
[ 97.274998] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 1
[ 97.282561] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 2
[ 97.289700] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 3
[ 97.599163] mscc_felix 0000:00:00.5 swp0 (uninitialized): PHY [0000:00:00.3:10] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 97.862034] mscc_felix 0000:00:00.5 swp1 (uninitialized): PHY [0000:00:00.3:11] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 97.950731] mscc_felix 0000:00:00.5 swp0: configuring for inband/qsgmii link mode
[ 97.964278] 8021q: adding VLAN 0 to HW filter on device swp0
[ 98.146161] mscc_felix 0000:00:00.5 swp2 (uninitialized): PHY [0000:00:00.3:12] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 98.238649] mscc_felix 0000:00:00.5 swp1: configuring for inband/qsgmii link mode
[ 98.251845] 8021q: adding VLAN 0 to HW filter on device swp1
[ 98.433916] mscc_felix 0000:00:00.5 swp3 (uninitialized): PHY [0000:00:00.3:13] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 98.485542] mscc_felix 0000:00:00.5: configuring for fixed/internal link mode
[ 98.503584] mscc_felix 0000:00:00.5: Link is Up - 2.5Gbps/Full - flow control rx/tx
[ 98.527948] device eno2 entered promiscuous mode
[ 98.544755] DSA: tree 0 setup
$ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
64 bytes from 10.0.0.1: seq=0 ttl=64 time=2.337 ms
64 bytes from 10.0.0.1: seq=1 ttl=64 time=0.754 ms
^C
- 10.0.0.1 ping statistics -
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.754/1.545/2.337 ms
$ cat /sys/class/net/eno2/dsa/tagging
ocelot
$ cat ./test_ocelot_8021q.sh
#!/bin/bash
ip link set swp0 down
ip link set swp1 down
ip link set swp2 down
ip link set swp3 down
ip link set swp5 down
ip link set eno2 down
echo ocelot-8021q > /sys/class/net/eno2/dsa/tagging
ip link set eno2 up
ip link set swp0 up
ip link set swp1 up
ip link set swp2 up
ip link set swp3 up
ip link set swp5 up
$ ./test_ocelot_8021q.sh
./test_ocelot_8021q.sh: line 9: echo: write error: Protocol not available
$ rmmod tag_ocelot.ko
rmmod: can't unload module 'tag_ocelot': Resource temporarily unavailable
$ insmod tag_ocelot_8021q.ko
$ ./test_ocelot_8021q.sh
$ cat /sys/class/net/eno2/dsa/tagging
ocelot-8021q
$ rmmod tag_ocelot.ko
$ rmmod tag_ocelot_8021q.ko
rmmod: can't unload module 'tag_ocelot_8021q': Resource temporarily unavailable
$ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
64 bytes from 10.0.0.1: seq=0 ttl=64 time=0.953 ms
64 bytes from 10.0.0.1: seq=1 ttl=64 time=0.787 ms
64 bytes from 10.0.0.1: seq=2 ttl=64 time=0.771 ms
$ rmmod mscc_felix.ko
[ 645.544426] mscc_felix 0000:00:00.5: Link is Down
[ 645.838608] DSA: tree 0 torn down
$ rmmod tag_ocelot_8021q.ko
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-29 09:00:06 +08:00
|
|
|
/*
|
|
|
|
|
* Tagging protocol helpers called for the CPU ports and DSA links.
|
|
|
|
|
* @get_tag_protocol retrieves the initial tagging protocol and is
|
|
|
|
|
* mandatory. Switches which can operate using multiple tagging
|
|
|
|
|
* protocols should implement @change_tag_protocol and report in
|
|
|
|
|
* @get_tag_protocol the tagger in current use.
|
|
|
|
|
*/
|
2017-11-11 07:22:52 +08:00
|
|
|
enum dsa_tag_protocol (*get_tag_protocol)(struct dsa_switch *ds,
|
2020-01-08 13:06:05 +08:00
|
|
|
int port,
|
|
|
|
|
enum dsa_tag_protocol mprot);
|
net: dsa: allow changing the tag protocol via the "tagging" device attribute
Currently DSA exposes the following sysfs:
$ cat /sys/class/net/eno2/dsa/tagging
ocelot
which is a read-only device attribute, introduced in the kernel as
commit 98cdb4807123 ("net: dsa: Expose tagging protocol to user-space"),
and used by libpcap since its commit 993db3800d7d ("Add support for DSA
link-layer types").
It would be nice if we could extend this device attribute by making it
writable:
$ echo ocelot-8021q > /sys/class/net/eno2/dsa/tagging
This is useful with DSA switches that can make use of more than one
tagging protocol. It may be useful in dsa_loop in the future too, to
perform offline testing of various taggers, or for changing between dsa
and edsa on Marvell switches, if that is desirable.
In terms of implementation, drivers can support this feature by
implementing .change_tag_protocol, which should always leave the switch
in a consistent state: either with the new protocol if things went well,
or with the old one if something failed. Teardown of the old protocol,
if necessary, must be handled by the driver.
Some things remain as before:
- The .get_tag_protocol is currently only called at probe time, to load
the initial tagging protocol driver. Nonetheless, new drivers should
report the tagging protocol in current use now.
- The driver should manage by itself the initial setup of tagging
protocol, no later than the .setup() method, as well as destroying
resources used by the last tagger in use, no earlier than the
.teardown() method.
For multi-switch DSA trees, error handling is a bit more complicated,
since e.g. the 5th out of 7 switches may fail to change the tag
protocol. When that happens, a revert to the original tag protocol is
attempted, but that may fail too, leaving the tree in an inconsistent
state despite each individual switch implementing .change_tag_protocol
transactionally. Since the intersection between drivers that implement
.change_tag_protocol and drivers that support D in DSA is currently the
empty set, the possibility for this error to happen is ignored for now.
Testing:
$ insmod mscc_felix.ko
[ 79.549784] mscc_felix 0000:00:00.5: Adding to iommu group 14
[ 79.565712] mscc_felix 0000:00:00.5: Failed to register DSA switch: -517
$ insmod tag_ocelot.ko
$ rmmod mscc_felix.ko
$ insmod mscc_felix.ko
[ 97.261724] libphy: VSC9959 internal MDIO bus: probed
[ 97.267363] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 0
[ 97.274998] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 1
[ 97.282561] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 2
[ 97.289700] mscc_felix 0000:00:00.5: Found PCS at internal MDIO address 3
[ 97.599163] mscc_felix 0000:00:00.5 swp0 (uninitialized): PHY [0000:00:00.3:10] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 97.862034] mscc_felix 0000:00:00.5 swp1 (uninitialized): PHY [0000:00:00.3:11] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 97.950731] mscc_felix 0000:00:00.5 swp0: configuring for inband/qsgmii link mode
[ 97.964278] 8021q: adding VLAN 0 to HW filter on device swp0
[ 98.146161] mscc_felix 0000:00:00.5 swp2 (uninitialized): PHY [0000:00:00.3:12] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 98.238649] mscc_felix 0000:00:00.5 swp1: configuring for inband/qsgmii link mode
[ 98.251845] 8021q: adding VLAN 0 to HW filter on device swp1
[ 98.433916] mscc_felix 0000:00:00.5 swp3 (uninitialized): PHY [0000:00:00.3:13] driver [Microsemi GE VSC8514 SyncE] (irq=POLL)
[ 98.485542] mscc_felix 0000:00:00.5: configuring for fixed/internal link mode
[ 98.503584] mscc_felix 0000:00:00.5: Link is Up - 2.5Gbps/Full - flow control rx/tx
[ 98.527948] device eno2 entered promiscuous mode
[ 98.544755] DSA: tree 0 setup
$ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
64 bytes from 10.0.0.1: seq=0 ttl=64 time=2.337 ms
64 bytes from 10.0.0.1: seq=1 ttl=64 time=0.754 ms
^C
- 10.0.0.1 ping statistics -
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.754/1.545/2.337 ms
$ cat /sys/class/net/eno2/dsa/tagging
ocelot
$ cat ./test_ocelot_8021q.sh
#!/bin/bash
ip link set swp0 down
ip link set swp1 down
ip link set swp2 down
ip link set swp3 down
ip link set swp5 down
ip link set eno2 down
echo ocelot-8021q > /sys/class/net/eno2/dsa/tagging
ip link set eno2 up
ip link set swp0 up
ip link set swp1 up
ip link set swp2 up
ip link set swp3 up
ip link set swp5 up
$ ./test_ocelot_8021q.sh
./test_ocelot_8021q.sh: line 9: echo: write error: Protocol not available
$ rmmod tag_ocelot.ko
rmmod: can't unload module 'tag_ocelot': Resource temporarily unavailable
$ insmod tag_ocelot_8021q.ko
$ ./test_ocelot_8021q.sh
$ cat /sys/class/net/eno2/dsa/tagging
ocelot-8021q
$ rmmod tag_ocelot.ko
$ rmmod tag_ocelot_8021q.ko
rmmod: can't unload module 'tag_ocelot_8021q': Resource temporarily unavailable
$ ping 10.0.0.1
PING 10.0.0.1 (10.0.0.1): 56 data bytes
64 bytes from 10.0.0.1: seq=0 ttl=64 time=0.953 ms
64 bytes from 10.0.0.1: seq=1 ttl=64 time=0.787 ms
64 bytes from 10.0.0.1: seq=2 ttl=64 time=0.771 ms
$ rmmod mscc_felix.ko
[ 645.544426] mscc_felix 0000:00:00.5: Link is Down
[ 645.838608] DSA: tree 0 torn down
$ rmmod tag_ocelot_8021q.ko
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-29 09:00:06 +08:00
|
|
|
int (*change_tag_protocol)(struct dsa_switch *ds, int port,
|
|
|
|
|
enum dsa_tag_protocol proto);
|
2016-08-22 22:01:01 +08:00
|
|
|
|
2011-11-28 01:06:08 +08:00
|
|
|
int (*setup)(struct dsa_switch *ds);
|
2019-06-08 20:04:28 +08:00
|
|
|
void (*teardown)(struct dsa_switch *ds);
|
2014-09-20 04:07:54 +08:00
|
|
|
u32 (*get_phy_flags)(struct dsa_switch *ds, int port);
|
2011-11-28 01:06:08 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Access to the switch's PHY registers.
|
|
|
|
|
*/
|
|
|
|
|
int (*phy_read)(struct dsa_switch *ds, int port, int regnum);
|
|
|
|
|
int (*phy_write)(struct dsa_switch *ds, int port,
|
|
|
|
|
int regnum, u16 val);
|
|
|
|
|
|
2014-08-28 08:04:53 +08:00
|
|
|
/*
|
|
|
|
|
* Link state adjustment (called from libphy)
|
|
|
|
|
*/
|
|
|
|
|
void (*adjust_link)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct phy_device *phydev);
|
2014-08-28 08:04:54 +08:00
|
|
|
void (*fixed_link_update)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct fixed_phy_status *st);
|
2014-08-28 08:04:53 +08:00
|
|
|
|
2018-05-11 04:17:32 +08:00
|
|
|
/*
|
|
|
|
|
* PHYLINK integration
|
|
|
|
|
*/
|
|
|
|
|
void (*phylink_validate)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned long *supported,
|
|
|
|
|
struct phylink_link_state *state);
|
|
|
|
|
int (*phylink_mac_link_state)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct phylink_link_state *state);
|
|
|
|
|
void (*phylink_mac_config)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int mode,
|
|
|
|
|
const struct phylink_link_state *state);
|
|
|
|
|
void (*phylink_mac_an_restart)(struct dsa_switch *ds, int port);
|
|
|
|
|
void (*phylink_mac_link_down)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int mode,
|
|
|
|
|
phy_interface_t interface);
|
|
|
|
|
void (*phylink_mac_link_up)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int mode,
|
|
|
|
|
phy_interface_t interface,
|
2020-02-26 18:23:46 +08:00
|
|
|
struct phy_device *phydev,
|
|
|
|
|
int speed, int duplex,
|
|
|
|
|
bool tx_pause, bool rx_pause);
|
2018-05-11 04:17:32 +08:00
|
|
|
void (*phylink_fixed_state)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct phylink_link_state *state);
|
2011-11-28 01:06:08 +08:00
|
|
|
/*
|
2021-01-11 18:46:57 +08:00
|
|
|
* Port statistics counters.
|
2011-11-28 01:06:08 +08:00
|
|
|
*/
|
2018-04-26 03:12:50 +08:00
|
|
|
void (*get_strings)(struct dsa_switch *ds, int port,
|
|
|
|
|
u32 stringset, uint8_t *data);
|
2011-11-28 01:06:08 +08:00
|
|
|
void (*get_ethtool_stats)(struct dsa_switch *ds,
|
|
|
|
|
int port, uint64_t *data);
|
2018-04-26 03:12:50 +08:00
|
|
|
int (*get_sset_count)(struct dsa_switch *ds, int port, int sset);
|
2018-04-26 03:12:52 +08:00
|
|
|
void (*get_ethtool_phy_stats)(struct dsa_switch *ds,
|
|
|
|
|
int port, uint64_t *data);
|
2021-01-11 18:46:57 +08:00
|
|
|
void (*get_stats64)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct rtnl_link_stats64 *s);
|
2014-09-19 08:31:22 +08:00
|
|
|
|
2014-09-19 08:31:24 +08:00
|
|
|
/*
|
|
|
|
|
* ethtool Wake-on-LAN
|
|
|
|
|
*/
|
|
|
|
|
void (*get_wol)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_wolinfo *w);
|
|
|
|
|
int (*set_wol)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_wolinfo *w);
|
|
|
|
|
|
2018-02-14 08:07:48 +08:00
|
|
|
/*
|
|
|
|
|
* ethtool timestamp info
|
|
|
|
|
*/
|
|
|
|
|
int (*get_ts_info)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_ts_info *ts);
|
|
|
|
|
|
2014-09-19 08:31:22 +08:00
|
|
|
/*
|
|
|
|
|
* Suspend and resume
|
|
|
|
|
*/
|
|
|
|
|
int (*suspend)(struct dsa_switch *ds);
|
|
|
|
|
int (*resume)(struct dsa_switch *ds);
|
2014-09-25 08:05:18 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Port enable/disable
|
|
|
|
|
*/
|
|
|
|
|
int (*port_enable)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct phy_device *phy);
|
2019-02-25 03:44:43 +08:00
|
|
|
void (*port_disable)(struct dsa_switch *ds, int port);
|
2014-09-25 08:05:21 +08:00
|
|
|
|
|
|
|
|
/*
|
2017-08-02 04:32:41 +08:00
|
|
|
* Port's MAC EEE settings
|
2014-09-25 08:05:21 +08:00
|
|
|
*/
|
2017-08-02 04:32:41 +08:00
|
|
|
int (*set_mac_eee)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_eee *e);
|
|
|
|
|
int (*get_mac_eee)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_eee *e);
|
2014-10-30 01:44:58 +08:00
|
|
|
|
2014-10-30 01:45:01 +08:00
|
|
|
/* EEPROM access */
|
|
|
|
|
int (*get_eeprom_len)(struct dsa_switch *ds);
|
|
|
|
|
int (*get_eeprom)(struct dsa_switch *ds,
|
|
|
|
|
struct ethtool_eeprom *eeprom, u8 *data);
|
|
|
|
|
int (*set_eeprom)(struct dsa_switch *ds,
|
|
|
|
|
struct ethtool_eeprom *eeprom, u8 *data);
|
2014-10-30 01:45:04 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Register access.
|
|
|
|
|
*/
|
|
|
|
|
int (*get_regs_len)(struct dsa_switch *ds, int port);
|
|
|
|
|
void (*get_regs)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_regs *regs, void *p);
|
2015-02-25 05:15:33 +08:00
|
|
|
|
2020-11-03 15:10:55 +08:00
|
|
|
/*
|
|
|
|
|
* Upper device tracking.
|
|
|
|
|
*/
|
|
|
|
|
int (*port_prechangeupper)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct netdev_notifier_changeupper_info *info);
|
|
|
|
|
|
2015-02-25 05:15:33 +08:00
|
|
|
/*
|
|
|
|
|
* Bridge integration
|
|
|
|
|
*/
|
2016-07-19 08:45:38 +08:00
|
|
|
int (*set_ageing_time)(struct dsa_switch *ds, unsigned int msecs);
|
2016-03-14 04:21:32 +08:00
|
|
|
int (*port_bridge_join)(struct dsa_switch *ds, int port,
|
2016-02-13 01:09:39 +08:00
|
|
|
struct net_device *bridge);
|
2017-01-28 04:29:41 +08:00
|
|
|
void (*port_bridge_leave)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct net_device *bridge);
|
2016-04-06 23:55:03 +08:00
|
|
|
void (*port_stp_state_set)(struct dsa_switch *ds, int port,
|
|
|
|
|
u8 state);
|
2016-09-23 04:49:22 +08:00
|
|
|
void (*port_fast_age)(struct dsa_switch *ds, int port);
|
2019-02-21 07:35:04 +08:00
|
|
|
int (*port_egress_floods)(struct dsa_switch *ds, int port,
|
|
|
|
|
bool unicast, bool multicast);
|
2015-08-10 21:09:49 +08:00
|
|
|
|
2015-08-14 00:52:17 +08:00
|
|
|
/*
|
|
|
|
|
* VLAN support
|
|
|
|
|
*/
|
2016-02-27 02:16:00 +08:00
|
|
|
int (*port_vlan_filtering)(struct dsa_switch *ds, int port,
|
net: switchdev: remove the transaction structure from port attributes
Since the introduction of the switchdev API, port attributes were
transmitted to drivers for offloading using a two-step transactional
model, with a prepare phase that was supposed to catch all errors, and a
commit phase that was supposed to never fail.
Some classes of failures can never be avoided, like hardware access, or
memory allocation. In the latter case, merely attempting to move the
memory allocation to the preparation phase makes it impossible to avoid
memory leaks, since commit 91cf8eceffc1 ("switchdev: Remove unused
transaction item queue") which has removed the unused mechanism of
passing on the allocated memory between one phase and another.
It is time we admit that separating the preparation from the commit
phase is something that is best left for the driver to decide, and not
something that should be baked into the API, especially since there are
no switchdev callers that depend on this.
This patch removes the struct switchdev_trans member from switchdev port
attribute notifier structures, and converts drivers to not look at this
member.
In part, this patch contains a revert of my previous commit 2e554a7a5d8a
("net: dsa: propagate switchdev vlan_filtering prepare phase to
drivers").
For the most part, the conversion was trivial except for:
- Rocker's world implementation based on Broadcom OF-DPA had an odd
implementation of ofdpa_port_attr_bridge_flags_set. The conversion was
done mechanically, by pasting the implementation twice, then only
keeping the code that would get executed during prepare phase on top,
then only keeping the code that gets executed during the commit phase
on bottom, then simplifying the resulting code until this was obtained.
- DSA's offloading of STP state, bridge flags, VLAN filtering and
multicast router could be converted right away. But the ageing time
could not, so a shim was introduced and this was left for a further
commit.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> # hellcreek
Reviewed-by: Linus Walleij <linus.walleij@linaro.org> # RTL8366RB
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-09 08:01:50 +08:00
|
|
|
bool vlan_filtering);
|
2021-01-09 08:01:53 +08:00
|
|
|
int (*port_vlan_add)(struct dsa_switch *ds, int port,
|
2017-12-01 00:23:57 +08:00
|
|
|
const struct switchdev_obj_port_vlan *vlan);
|
2015-11-02 01:33:55 +08:00
|
|
|
int (*port_vlan_del)(struct dsa_switch *ds, int port,
|
|
|
|
|
const struct switchdev_obj_port_vlan *vlan);
|
2015-08-10 21:09:49 +08:00
|
|
|
/*
|
|
|
|
|
* Forwarding database
|
|
|
|
|
*/
|
2017-08-06 21:15:40 +08:00
|
|
|
int (*port_fdb_add)(struct dsa_switch *ds, int port,
|
2017-08-06 21:15:39 +08:00
|
|
|
const unsigned char *addr, u16 vid);
|
2015-08-10 21:09:49 +08:00
|
|
|
int (*port_fdb_del)(struct dsa_switch *ds, int port,
|
2017-08-06 21:15:39 +08:00
|
|
|
const unsigned char *addr, u16 vid);
|
2015-10-22 21:34:38 +08:00
|
|
|
int (*port_fdb_dump)(struct dsa_switch *ds, int port,
|
2017-08-06 21:15:49 +08:00
|
|
|
dsa_fdb_dump_cb_t *cb, void *data);
|
2016-08-31 23:50:03 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Multicast database
|
|
|
|
|
*/
|
2021-01-09 08:01:52 +08:00
|
|
|
int (*port_mdb_add)(struct dsa_switch *ds, int port,
|
2017-12-01 00:23:58 +08:00
|
|
|
const struct switchdev_obj_port_mdb *mdb);
|
2016-08-31 23:50:03 +08:00
|
|
|
int (*port_mdb_del)(struct dsa_switch *ds, int port,
|
|
|
|
|
const struct switchdev_obj_port_mdb *mdb);
|
2017-01-31 01:48:40 +08:00
|
|
|
/*
|
|
|
|
|
* RXNFC
|
|
|
|
|
*/
|
|
|
|
|
int (*get_rxnfc)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_rxnfc *nfc, u32 *rule_locs);
|
|
|
|
|
int (*set_rxnfc)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ethtool_rxnfc *nfc);
|
2017-01-31 04:41:40 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* TC integration
|
|
|
|
|
*/
|
2020-02-29 22:31:13 +08:00
|
|
|
int (*cls_flower_add)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct flow_cls_offload *cls, bool ingress);
|
|
|
|
|
int (*cls_flower_del)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct flow_cls_offload *cls, bool ingress);
|
|
|
|
|
int (*cls_flower_stats)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct flow_cls_offload *cls, bool ingress);
|
2017-01-31 04:41:40 +08:00
|
|
|
int (*port_mirror_add)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct dsa_mall_mirror_tc_entry *mirror,
|
|
|
|
|
bool ingress);
|
|
|
|
|
void (*port_mirror_del)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct dsa_mall_mirror_tc_entry *mirror);
|
2020-03-29 19:51:59 +08:00
|
|
|
int (*port_policer_add)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct dsa_mall_policer_tc_entry *policer);
|
|
|
|
|
void (*port_policer_del)(struct dsa_switch *ds, int port);
|
2019-09-15 09:59:59 +08:00
|
|
|
int (*port_setup_tc)(struct dsa_switch *ds, int port,
|
|
|
|
|
enum tc_setup_type type, void *type_data);
|
2017-03-31 05:37:14 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Cross-chip operations
|
|
|
|
|
*/
|
net: dsa: permit cross-chip bridging between all trees in the system
One way of utilizing DSA is by cascading switches which do not all have
compatible taggers. Consider the following real-life topology:
+---------------------------------------------------------------+
| LS1028A |
| +------------------------------+ |
| | DSA master for Felix | |
| |(internal ENETC port 2: eno2))| |
| +------------+------------------------------+-------------+ |
| | Felix embedded L2 switch | |
| | | |
| | +--------------+ +--------------+ +--------------+ | |
| | |DSA master for| |DSA master for| |DSA master for| | |
| | | SJA1105 1 | | SJA1105 2 | | SJA1105 3 | | |
| | |(Felix port 1)| |(Felix port 2)| |(Felix port 3)| | |
+--+-+--------------+---+--------------+---+--------------+--+--+
+-----------------------+ +-----------------------+ +-----------------------+
| SJA1105 switch 1 | | SJA1105 switch 2 | | SJA1105 switch 3 |
+-----+-----+-----+-----+ +-----+-----+-----+-----+ +-----+-----+-----+-----+
|sw1p0|sw1p1|sw1p2|sw1p3| |sw2p0|sw2p1|sw2p2|sw2p3| |sw3p0|sw3p1|sw3p2|sw3p3|
+-----+-----+-----+-----+ +-----+-----+-----+-----+ +-----+-----+-----+-----+
The above can be described in the device tree as follows (obviously not
complete):
mscc_felix {
dsa,member = <0 0>;
ports {
port@4 {
ethernet = <&enetc_port2>;
};
};
};
sja1105_switch1 {
dsa,member = <1 1>;
ports {
port@4 {
ethernet = <&mscc_felix_port1>;
};
};
};
sja1105_switch2 {
dsa,member = <2 2>;
ports {
port@4 {
ethernet = <&mscc_felix_port2>;
};
};
};
sja1105_switch3 {
dsa,member = <3 3>;
ports {
port@4 {
ethernet = <&mscc_felix_port3>;
};
};
};
Basically we instantiate one DSA switch tree for every hardware switch
in the system, but we still give them globally unique switch IDs (will
come back to that later). Having 3 disjoint switch trees makes the
tagger drivers "just work", because net devices are registered for the
3 Felix DSA master ports, and they are also DSA slave ports to the ENETC
port. So packets received on the ENETC port are stripped of their
stacked DSA tags one by one.
Currently, hardware bridging between ports on the same sja1105 chip is
possible, but switching between sja1105 ports on different chips is
handled by the software bridge. This is fine, but we can do better.
In fact, the dsa_8021q tag used by sja1105 is compatible with cascading.
In other words, a sja1105 switch can correctly parse and route a packet
containing a dsa_8021q tag. So if we could enable hardware bridging on
the Felix DSA master ports, cross-chip bridging could be completely
offloaded.
Such as system would be used as follows:
ip link add dev br0 type bridge && ip link set dev br0 up
for port in sw0p0 sw0p1 sw0p2 sw0p3 \
sw1p0 sw1p1 sw1p2 sw1p3 \
sw2p0 sw2p1 sw2p2 sw2p3; do
ip link set dev $port master br0
done
The above makes switching between ports on the same row be performed in
hardware, and between ports on different rows in software. Now assume
the Felix switch ports are called swp0, swp1, swp2. By running the
following extra commands:
ip link add dev br1 type bridge && ip link set dev br1 up
for port in swp0 swp1 swp2; do
ip link set dev $port master br1
done
the CPU no longer sees packets which traverse sja1105 switch boundaries
and can be forwarded directly by Felix. The br1 bridge would not be used
for any sort of traffic termination.
For this to work, we need to give drivers an opportunity to listen for
bridging events on DSA trees other than their own, and pass that other
tree index as argument. I have made the assumption, for the moment, that
the other existing DSA notifiers don't need to be broadcast to other
trees. That assumption might turn out to be incorrect. But in the
meantime, introduce a dsa_broadcast function, similar in purpose to
dsa_port_notify, which is used only by the bridging notifiers.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-05-11 00:37:41 +08:00
|
|
|
int (*crosschip_bridge_join)(struct dsa_switch *ds, int tree_index,
|
|
|
|
|
int sw_index, int port,
|
|
|
|
|
struct net_device *br);
|
|
|
|
|
void (*crosschip_bridge_leave)(struct dsa_switch *ds, int tree_index,
|
|
|
|
|
int sw_index, int port,
|
|
|
|
|
struct net_device *br);
|
2021-01-13 16:42:53 +08:00
|
|
|
int (*crosschip_lag_change)(struct dsa_switch *ds, int sw_index,
|
|
|
|
|
int port);
|
|
|
|
|
int (*crosschip_lag_join)(struct dsa_switch *ds, int sw_index,
|
|
|
|
|
int port, struct net_device *lag,
|
|
|
|
|
struct netdev_lag_upper_info *info);
|
|
|
|
|
int (*crosschip_lag_leave)(struct dsa_switch *ds, int sw_index,
|
|
|
|
|
int port, struct net_device *lag);
|
2018-02-14 08:07:48 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* PTP functionality
|
|
|
|
|
*/
|
|
|
|
|
int (*port_hwtstamp_get)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ifreq *ifr);
|
|
|
|
|
int (*port_hwtstamp_set)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct ifreq *ifr);
|
2018-02-14 08:07:49 +08:00
|
|
|
bool (*port_txtstamp)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct sk_buff *clone, unsigned int type);
|
|
|
|
|
bool (*port_rxtstamp)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct sk_buff *skb, unsigned int type);
|
2019-05-05 18:19:25 +08:00
|
|
|
|
2020-09-19 03:11:08 +08:00
|
|
|
/* Devlink parameters, etc */
|
2019-10-25 07:03:51 +08:00
|
|
|
int (*devlink_param_get)(struct dsa_switch *ds, u32 id,
|
|
|
|
|
struct devlink_param_gset_ctx *ctx);
|
|
|
|
|
int (*devlink_param_set)(struct dsa_switch *ds, u32 id,
|
|
|
|
|
struct devlink_param_gset_ctx *ctx);
|
2020-09-19 03:11:08 +08:00
|
|
|
int (*devlink_info_get)(struct dsa_switch *ds,
|
|
|
|
|
struct devlink_info_req *req,
|
|
|
|
|
struct netlink_ext_ack *extack);
|
2021-01-15 10:11:13 +08:00
|
|
|
int (*devlink_sb_pool_get)(struct dsa_switch *ds,
|
|
|
|
|
unsigned int sb_index, u16 pool_index,
|
|
|
|
|
struct devlink_sb_pool_info *pool_info);
|
|
|
|
|
int (*devlink_sb_pool_set)(struct dsa_switch *ds, unsigned int sb_index,
|
|
|
|
|
u16 pool_index, u32 size,
|
|
|
|
|
enum devlink_sb_threshold_type threshold_type,
|
|
|
|
|
struct netlink_ext_ack *extack);
|
|
|
|
|
int (*devlink_sb_port_pool_get)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int sb_index, u16 pool_index,
|
|
|
|
|
u32 *p_threshold);
|
|
|
|
|
int (*devlink_sb_port_pool_set)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int sb_index, u16 pool_index,
|
|
|
|
|
u32 threshold,
|
|
|
|
|
struct netlink_ext_ack *extack);
|
|
|
|
|
int (*devlink_sb_tc_pool_bind_get)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int sb_index, u16 tc_index,
|
|
|
|
|
enum devlink_sb_pool_type pool_type,
|
|
|
|
|
u16 *p_pool_index, u32 *p_threshold);
|
|
|
|
|
int (*devlink_sb_tc_pool_bind_set)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int sb_index, u16 tc_index,
|
|
|
|
|
enum devlink_sb_pool_type pool_type,
|
|
|
|
|
u16 pool_index, u32 threshold,
|
|
|
|
|
struct netlink_ext_ack *extack);
|
|
|
|
|
int (*devlink_sb_occ_snapshot)(struct dsa_switch *ds,
|
|
|
|
|
unsigned int sb_index);
|
|
|
|
|
int (*devlink_sb_occ_max_clear)(struct dsa_switch *ds,
|
|
|
|
|
unsigned int sb_index);
|
|
|
|
|
int (*devlink_sb_occ_port_pool_get)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int sb_index, u16 pool_index,
|
|
|
|
|
u32 *p_cur, u32 *p_max);
|
|
|
|
|
int (*devlink_sb_occ_tc_port_bind_get)(struct dsa_switch *ds, int port,
|
|
|
|
|
unsigned int sb_index, u16 tc_index,
|
|
|
|
|
enum devlink_sb_pool_type pool_type,
|
|
|
|
|
u32 *p_cur, u32 *p_max);
|
net: dsa: configure the MTU for switch ports
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>
2020-03-28 03:55:42 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* MTU change functionality. Switches can also adjust their MRU through
|
|
|
|
|
* this method. By MTU, one understands the SDU (L2 payload) length.
|
|
|
|
|
* If the switch needs to account for the DSA tag on the CPU port, this
|
2020-07-16 00:42:43 +08:00
|
|
|
* method needs to do so privately.
|
net: dsa: configure the MTU for switch ports
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>
2020-03-28 03:55:42 +08:00
|
|
|
*/
|
|
|
|
|
int (*port_change_mtu)(struct dsa_switch *ds, int port,
|
|
|
|
|
int new_mtu);
|
|
|
|
|
int (*port_max_mtu)(struct dsa_switch *ds, int port);
|
2021-01-13 16:42:53 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* LAG integration
|
|
|
|
|
*/
|
|
|
|
|
int (*port_lag_change)(struct dsa_switch *ds, int port);
|
|
|
|
|
int (*port_lag_join)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct net_device *lag,
|
|
|
|
|
struct netdev_lag_upper_info *info);
|
|
|
|
|
int (*port_lag_leave)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct net_device *lag);
|
2021-02-10 09:02:12 +08:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* HSR integration
|
|
|
|
|
*/
|
|
|
|
|
int (*port_hsr_join)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct net_device *hsr);
|
|
|
|
|
int (*port_hsr_leave)(struct dsa_switch *ds, int port,
|
|
|
|
|
struct net_device *hsr);
|
2019-10-25 07:03:51 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
|
|
#define DSA_DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes) \
|
|
|
|
|
DEVLINK_PARAM_DRIVER(_id, _name, _type, _cmodes, \
|
|
|
|
|
dsa_devlink_param_get, dsa_devlink_param_set, NULL)
|
|
|
|
|
|
|
|
|
|
int dsa_devlink_param_get(struct devlink *dl, u32 id,
|
|
|
|
|
struct devlink_param_gset_ctx *ctx);
|
|
|
|
|
int dsa_devlink_param_set(struct devlink *dl, u32 id,
|
|
|
|
|
struct devlink_param_gset_ctx *ctx);
|
|
|
|
|
int dsa_devlink_params_register(struct dsa_switch *ds,
|
|
|
|
|
const struct devlink_param *params,
|
|
|
|
|
size_t params_count);
|
|
|
|
|
void dsa_devlink_params_unregister(struct dsa_switch *ds,
|
|
|
|
|
const struct devlink_param *params,
|
|
|
|
|
size_t params_count);
|
2019-11-05 08:12:57 +08:00
|
|
|
int dsa_devlink_resource_register(struct dsa_switch *ds,
|
|
|
|
|
const char *resource_name,
|
|
|
|
|
u64 resource_size,
|
|
|
|
|
u64 resource_id,
|
|
|
|
|
u64 parent_resource_id,
|
|
|
|
|
const struct devlink_resource_size_params *size_params);
|
|
|
|
|
|
|
|
|
|
void dsa_devlink_resources_unregister(struct dsa_switch *ds);
|
|
|
|
|
|
|
|
|
|
void dsa_devlink_resource_occ_get_register(struct dsa_switch *ds,
|
|
|
|
|
u64 resource_id,
|
|
|
|
|
devlink_resource_occ_get_t *occ_get,
|
|
|
|
|
void *occ_get_priv);
|
|
|
|
|
void dsa_devlink_resource_occ_get_unregister(struct dsa_switch *ds,
|
|
|
|
|
u64 resource_id);
|
2020-09-19 03:11:04 +08:00
|
|
|
struct devlink_region *
|
|
|
|
|
dsa_devlink_region_create(struct dsa_switch *ds,
|
|
|
|
|
const struct devlink_region_ops *ops,
|
|
|
|
|
u32 region_max_snapshots, u64 region_size);
|
2020-10-05 00:12:55 +08:00
|
|
|
struct devlink_region *
|
|
|
|
|
dsa_devlink_port_region_create(struct dsa_switch *ds,
|
|
|
|
|
int port,
|
|
|
|
|
const struct devlink_port_region_ops *ops,
|
|
|
|
|
u32 region_max_snapshots, u64 region_size);
|
2020-09-19 03:11:04 +08:00
|
|
|
void dsa_devlink_region_destroy(struct devlink_region *region);
|
|
|
|
|
|
net: dsa: introduce a dsa_port_from_netdev public helper
As its implementation shows, this is synonimous with calling
dsa_slave_dev_check followed by dsa_slave_to_port, so it is quite simple
already and provides functionality which is already there.
However there is now a need for these functions outside dsa_priv.h, for
example in drivers that perform mirroring and redirection through
tc-flower offloads (they are given raw access to the flow_cls_offload
structure), where they need to call this function on act->dev.
But simply exporting dsa_slave_to_port would make it non-inline and
would result in an extra function call in the hotpath, as can be seen
for example in sja1105:
Before:
000006dc <sja1105_xmit>:
{
6dc: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
6e0: e1a04000 mov r4, r0
6e4: e591958c ldr r9, [r1, #1420] ; 0x58c <- Inline dsa_slave_to_port
6e8: e1a05001 mov r5, r1
6ec: e24dd004 sub sp, sp, #4
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
6f0: e1c901d8 ldrd r0, [r9, #24]
6f4: ebfffffe bl 0 <dsa_8021q_tx_vid>
6f4: R_ARM_CALL dsa_8021q_tx_vid
u8 pcp = netdev_txq_to_tc(netdev, queue_mapping);
6f8: e1d416b0 ldrh r1, [r4, #96] ; 0x60
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
6fc: e1a08000 mov r8, r0
After:
000006e4 <sja1105_xmit>:
{
6e4: e92d4ff0 push {r4, r5, r6, r7, r8, r9, sl, fp, lr}
6e8: e1a04000 mov r4, r0
6ec: e24dd004 sub sp, sp, #4
struct dsa_port *dp = dsa_slave_to_port(netdev);
6f0: e1a00001 mov r0, r1
{
6f4: e1a05001 mov r5, r1
struct dsa_port *dp = dsa_slave_to_port(netdev);
6f8: ebfffffe bl 0 <dsa_slave_to_port>
6f8: R_ARM_CALL dsa_slave_to_port
6fc: e1a09000 mov r9, r0
u16 tx_vid = dsa_8021q_tx_vid(dp->ds, dp->index);
700: e1c001d8 ldrd r0, [r0, #24]
704: ebfffffe bl 0 <dsa_8021q_tx_vid>
704: R_ARM_CALL dsa_8021q_tx_vid
Because we want to avoid possible performance regressions, introduce
this new function which is designed to be public.
Suggested-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-05-06 03:20:52 +08:00
|
|
|
struct dsa_port *dsa_port_from_netdev(struct net_device *netdev);
|
2019-11-05 08:12:57 +08:00
|
|
|
|
2019-10-25 07:03:51 +08:00
|
|
|
struct dsa_devlink_priv {
|
|
|
|
|
struct dsa_switch *ds;
|
2011-11-28 01:06:08 +08:00
|
|
|
};
|
|
|
|
|
|
2020-09-19 03:11:03 +08:00
|
|
|
static inline struct dsa_switch *dsa_devlink_to_ds(struct devlink *dl)
|
|
|
|
|
{
|
|
|
|
|
struct dsa_devlink_priv *dl_priv = devlink_priv(dl);
|
|
|
|
|
|
|
|
|
|
return dl_priv->ds;
|
|
|
|
|
}
|
|
|
|
|
|
2020-10-05 00:12:56 +08:00
|
|
|
static inline
|
|
|
|
|
struct dsa_switch *dsa_devlink_port_to_ds(struct devlink_port *port)
|
|
|
|
|
{
|
|
|
|
|
struct devlink *dl = port->devlink;
|
|
|
|
|
struct dsa_devlink_priv *dl_priv = devlink_priv(dl);
|
|
|
|
|
|
|
|
|
|
return dl_priv->ds;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline int dsa_devlink_port_to_port(struct devlink_port *port)
|
|
|
|
|
{
|
|
|
|
|
return port->index;
|
|
|
|
|
}
|
|
|
|
|
|
2017-01-09 06:52:07 +08:00
|
|
|
struct dsa_switch_driver {
|
|
|
|
|
struct list_head list;
|
2017-01-09 06:52:08 +08:00
|
|
|
const struct dsa_switch_ops *ops;
|
2017-01-09 06:52:07 +08:00
|
|
|
};
|
|
|
|
|
|
2017-02-05 05:02:42 +08:00
|
|
|
struct net_device *dsa_dev_to_net_device(struct device *dev);
|
2011-11-28 01:06:08 +08:00
|
|
|
|
2017-06-02 04:07:11 +08:00
|
|
|
/* Keep inline for faster access in hot path */
|
2020-05-11 00:37:40 +08:00
|
|
|
static inline bool netdev_uses_dsa(const struct net_device *dev)
|
2017-03-29 05:45:06 +08:00
|
|
|
{
|
|
|
|
|
#if IS_ENABLED(CONFIG_NET_DSA)
|
2017-06-02 04:07:13 +08:00
|
|
|
return dev->dsa_ptr && dev->dsa_ptr->rcv;
|
2017-03-29 05:45:06 +08:00
|
|
|
#endif
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
net: dsa: Allow drivers to filter packets they can decode source port from
Frames get processed by DSA and redirected to switch port net devices
based on the ETH_P_XDSA multiplexed packet_type handler found by the
network stack when calling eth_type_trans().
The running assumption is that once the DSA .rcv function is called, DSA
is always able to decode the switch tag in order to change the skb->dev
from its master.
However there are tagging protocols (such as the new DSA_TAG_PROTO_SJA1105,
user of DSA_TAG_PROTO_8021Q) where this assumption is not completely
true, since switch tagging piggybacks on the absence of a vlan_filtering
bridge. Moreover, management traffic (BPDU, PTP) for this switch doesn't
rely on switch tagging, but on a different mechanism. So it would make
sense to at least be able to terminate that.
Having DSA receive traffic it can't decode would put it in an impossible
situation: the eth_type_trans() function would invoke the DSA .rcv(),
which could not change skb->dev, then eth_type_trans() would be invoked
again, which again would call the DSA .rcv, and the packet would never
be able to exit the DSA filter and would spiral in a loop until the
whole system dies.
This happens because eth_type_trans() doesn't actually look at the skb
(so as to identify a potential tag) when it deems it as being
ETH_P_XDSA. It just checks whether skb->dev has a DSA private pointer
installed (therefore it's a DSA master) and that there exists a .rcv
callback (everybody except DSA_TAG_PROTO_NONE has that). This is
understandable as there are many switch tags out there, and exhaustively
checking for all of them is far from ideal.
The solution lies in introducing a filtering function for each tagging
protocol. In the absence of a filtering function, all traffic is passed
to the .rcv DSA callback. The tagging protocol should see the filtering
function as a pre-validation that it can decode the incoming skb. The
traffic that doesn't match the filter will bypass the DSA .rcv callback
and be left on the master netdevice, which wasn't previously possible.
Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-05 18:19:23 +08:00
|
|
|
static inline bool dsa_can_decode(const struct sk_buff *skb,
|
|
|
|
|
struct net_device *dev)
|
|
|
|
|
{
|
|
|
|
|
#if IS_ENABLED(CONFIG_NET_DSA)
|
|
|
|
|
return !dev->dsa_ptr->filter || dev->dsa_ptr->filter(skb, dev);
|
|
|
|
|
#endif
|
|
|
|
|
return false;
|
|
|
|
|
}
|
|
|
|
|
|
2020-09-27 03:32:06 +08:00
|
|
|
/* All DSA tags that push the EtherType to the right (basically all except tail
|
|
|
|
|
* tags, which don't break dissection) can be treated the same from the
|
|
|
|
|
* perspective of the flow dissector.
|
|
|
|
|
*
|
|
|
|
|
* We need to return:
|
|
|
|
|
* - offset: the (B - A) difference between:
|
|
|
|
|
* A. the position of the real EtherType and
|
|
|
|
|
* B. the current skb->data (aka ETH_HLEN bytes into the frame, aka 2 bytes
|
|
|
|
|
* after the normal EtherType was supposed to be)
|
|
|
|
|
* The offset in bytes is exactly equal to the tagger overhead (and half of
|
|
|
|
|
* that, in __be16 shorts).
|
|
|
|
|
*
|
|
|
|
|
* - proto: the value of the real EtherType.
|
|
|
|
|
*/
|
|
|
|
|
static inline void dsa_tag_generic_flow_dissect(const struct sk_buff *skb,
|
|
|
|
|
__be16 *proto, int *offset)
|
|
|
|
|
{
|
|
|
|
|
#if IS_ENABLED(CONFIG_NET_DSA)
|
|
|
|
|
const struct dsa_device_ops *ops = skb->dev->dsa_ptr->tag_ops;
|
|
|
|
|
int tag_len = ops->overhead;
|
|
|
|
|
|
|
|
|
|
*offset = tag_len;
|
|
|
|
|
*proto = ((__be16 *)skb->data)[(tag_len / 2) - 1];
|
|
|
|
|
#endif
|
|
|
|
|
}
|
|
|
|
|
|
2020-07-20 11:49:52 +08:00
|
|
|
#if IS_ENABLED(CONFIG_NET_DSA)
|
|
|
|
|
static inline int __dsa_netdevice_ops_check(struct net_device *dev)
|
|
|
|
|
{
|
|
|
|
|
int err = -EOPNOTSUPP;
|
|
|
|
|
|
|
|
|
|
if (!dev->dsa_ptr)
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
if (!dev->dsa_ptr->netdev_ops)
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static inline int dsa_ndo_do_ioctl(struct net_device *dev, struct ifreq *ifr,
|
|
|
|
|
int cmd)
|
|
|
|
|
{
|
|
|
|
|
const struct dsa_netdevice_ops *ops;
|
|
|
|
|
int err;
|
|
|
|
|
|
|
|
|
|
err = __dsa_netdevice_ops_check(dev);
|
|
|
|
|
if (err)
|
|
|
|
|
return err;
|
|
|
|
|
|
|
|
|
|
ops = dev->dsa_ptr->netdev_ops;
|
|
|
|
|
|
|
|
|
|
return ops->ndo_do_ioctl(dev, ifr, cmd);
|
|
|
|
|
}
|
|
|
|
|
#else
|
|
|
|
|
static inline int dsa_ndo_do_ioctl(struct net_device *dev, struct ifreq *ifr,
|
|
|
|
|
int cmd)
|
|
|
|
|
{
|
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
}
|
|
|
|
|
#endif
|
|
|
|
|
|
2016-06-05 03:17:07 +08:00
|
|
|
void dsa_unregister_switch(struct dsa_switch *ds);
|
2017-05-27 06:12:51 +08:00
|
|
|
int dsa_register_switch(struct dsa_switch *ds);
|
2020-05-11 00:37:42 +08:00
|
|
|
struct dsa_switch *dsa_switch_find(int tree_index, int sw_index);
|
2016-08-19 06:30:12 +08:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
|
int dsa_switch_suspend(struct dsa_switch *ds);
|
|
|
|
|
int dsa_switch_resume(struct dsa_switch *ds);
|
|
|
|
|
#else
|
|
|
|
|
static inline int dsa_switch_suspend(struct dsa_switch *ds)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
static inline int dsa_switch_resume(struct dsa_switch *ds)
|
|
|
|
|
{
|
|
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return 0;
|
|
|
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}
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|
|
|
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#endif /* CONFIG_PM_SLEEP */
|
|
|
|
|
|
2017-10-12 01:57:48 +08:00
|
|
|
#if IS_ENABLED(CONFIG_NET_DSA)
|
2021-01-07 09:24:01 +08:00
|
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|
bool dsa_slave_dev_check(const struct net_device *dev);
|
2017-10-12 01:57:48 +08:00
|
|
|
#else
|
2021-01-07 09:24:01 +08:00
|
|
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static inline bool dsa_slave_dev_check(const struct net_device *dev)
|
|
|
|
|
{
|
|
|
|
|
return false;
|
|
|
|
|
}
|
2017-10-12 01:57:48 +08:00
|
|
|
#endif
|
|
|
|
|
|
2019-05-05 18:19:25 +08:00
|
|
|
netdev_tx_t dsa_enqueue_skb(struct sk_buff *skb, struct net_device *dev);
|
2018-04-26 03:12:52 +08:00
|
|
|
int dsa_port_get_phy_strings(struct dsa_port *dp, uint8_t *data);
|
|
|
|
|
int dsa_port_get_ethtool_phy_stats(struct dsa_port *dp, uint64_t *data);
|
|
|
|
|
int dsa_port_get_phy_sset_count(struct dsa_port *dp);
|
2018-05-11 04:17:32 +08:00
|
|
|
void dsa_port_phylink_mac_change(struct dsa_switch *ds, int port, bool up);
|
2018-04-26 03:12:52 +08:00
|
|
|
|
2019-04-29 01:37:15 +08:00
|
|
|
struct dsa_tag_driver {
|
|
|
|
|
const struct dsa_device_ops *ops;
|
|
|
|
|
struct list_head list;
|
|
|
|
|
struct module *owner;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
void dsa_tag_drivers_register(struct dsa_tag_driver *dsa_tag_driver_array[],
|
|
|
|
|
unsigned int count,
|
|
|
|
|
struct module *owner);
|
|
|
|
|
void dsa_tag_drivers_unregister(struct dsa_tag_driver *dsa_tag_driver_array[],
|
|
|
|
|
unsigned int count);
|
|
|
|
|
|
|
|
|
|
#define dsa_tag_driver_module_drivers(__dsa_tag_drivers_array, __count) \
|
|
|
|
|
static int __init dsa_tag_driver_module_init(void) \
|
|
|
|
|
{ \
|
|
|
|
|
dsa_tag_drivers_register(__dsa_tag_drivers_array, __count, \
|
|
|
|
|
THIS_MODULE); \
|
|
|
|
|
return 0; \
|
|
|
|
|
} \
|
|
|
|
|
module_init(dsa_tag_driver_module_init); \
|
|
|
|
|
\
|
|
|
|
|
static void __exit dsa_tag_driver_module_exit(void) \
|
|
|
|
|
{ \
|
|
|
|
|
dsa_tag_drivers_unregister(__dsa_tag_drivers_array, __count); \
|
|
|
|
|
} \
|
|
|
|
|
module_exit(dsa_tag_driver_module_exit)
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* module_dsa_tag_drivers() - Helper macro for registering DSA tag
|
|
|
|
|
* drivers
|
|
|
|
|
* @__ops_array: Array of tag driver strucutres
|
|
|
|
|
*
|
|
|
|
|
* Helper macro for DSA tag drivers which do not do anything special
|
|
|
|
|
* in module init/exit. Each module may only use this macro once, and
|
|
|
|
|
* calling it replaces module_init() and module_exit().
|
|
|
|
|
*/
|
|
|
|
|
#define module_dsa_tag_drivers(__ops_array) \
|
|
|
|
|
dsa_tag_driver_module_drivers(__ops_array, ARRAY_SIZE(__ops_array))
|
|
|
|
|
|
|
|
|
|
#define DSA_TAG_DRIVER_NAME(__ops) dsa_tag_driver ## _ ## __ops
|
|
|
|
|
|
|
|
|
|
/* Create a static structure we can build a linked list of dsa_tag
|
|
|
|
|
* drivers
|
|
|
|
|
*/
|
|
|
|
|
#define DSA_TAG_DRIVER(__ops) \
|
|
|
|
|
static struct dsa_tag_driver DSA_TAG_DRIVER_NAME(__ops) = { \
|
|
|
|
|
.ops = &__ops, \
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* module_dsa_tag_driver() - Helper macro for registering a single DSA tag
|
|
|
|
|
* driver
|
|
|
|
|
* @__ops: Single tag driver structures
|
|
|
|
|
*
|
|
|
|
|
* Helper macro for DSA tag drivers which do not do anything special
|
|
|
|
|
* in module init/exit. Each module may only use this macro once, and
|
|
|
|
|
* calling it replaces module_init() and module_exit().
|
|
|
|
|
*/
|
|
|
|
|
#define module_dsa_tag_driver(__ops) \
|
|
|
|
|
DSA_TAG_DRIVER(__ops); \
|
|
|
|
|
\
|
|
|
|
|
static struct dsa_tag_driver *dsa_tag_driver_array[] = { \
|
|
|
|
|
&DSA_TAG_DRIVER_NAME(__ops) \
|
|
|
|
|
}; \
|
|
|
|
|
module_dsa_tag_drivers(dsa_tag_driver_array)
|
net: Distributed Switch Architecture protocol support
Distributed Switch Architecture is a protocol for managing hardware
switch chips. It consists of a set of MII management registers and
commands to configure the switch, and an ethernet header format to
signal which of the ports of the switch a packet was received from
or is intended to be sent to.
The switches that this driver supports are typically embedded in
access points and routers, and a typical setup with a DSA switch
looks something like this:
+-----------+ +-----------+
| | RGMII | |
| +-------+ +------ 1000baseT MDI ("WAN")
| | | 6-port +------ 1000baseT MDI ("LAN1")
| CPU | | ethernet +------ 1000baseT MDI ("LAN2")
| |MIImgmt| switch +------ 1000baseT MDI ("LAN3")
| +-------+ w/5 PHYs +------ 1000baseT MDI ("LAN4")
| | | |
+-----------+ +-----------+
The switch driver presents each port on the switch as a separate
network interface to Linux, polls the switch to maintain software
link state of those ports, forwards MII management interface
accesses to those network interfaces (e.g. as done by ethtool) to
the switch, and exposes the switch's hardware statistics counters
via the appropriate Linux kernel interfaces.
This initial patch supports the MII management interface register
layout of the Marvell 88E6123, 88E6161 and 88E6165 switch chips, and
supports the "Ethertype DSA" packet tagging format.
(There is no officially registered ethertype for the Ethertype DSA
packet format, so we just grab a random one. The ethertype to use
is programmed into the switch, and the switch driver uses the value
of ETH_P_EDSA for this, so this define can be changed at any time in
the future if the one we chose is allocated to another protocol or
if Ethertype DSA gets its own officially registered ethertype, and
everything will continue to work.)
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Nicolas Pitre <nico@marvell.com>
Tested-by: Byron Bradley <byron.bbradley@gmail.com>
Tested-by: Tim Ellis <tim.ellis@mac.com>
Tested-by: Peter van Valderen <linux@ddcrew.com>
Tested-by: Dirk Teurlings <dirk@upexia.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-10-07 21:44:02 +08:00
|
|
|
#endif
|
2019-04-29 01:37:15 +08:00
|
|
|
|