The switchdev design implies that a software error should not happen in
the commit phase since it must have been previously reported in the
prepare phase. If an hardware error occurs during the commit phase,
there is nothing switchdev can do about it.

The DSA layer separates port_vlan_prepare and port_vlan_add for
simplicity and convenience. If an hardware error occurs during the
commit phase, there is no need to report it outside the driver itself.

Make the DSA port_vlan_add routine return void for explicitness.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The switchdev design implies that a software error should not happen in
the commit phase since it must have been previously reported in the
prepare phase. If an hardware error occurs during the commit phase,
there is nothing switchdev can do about it.

The DSA layer separates port_fdb_prepare and port_fdb_add for simplicity
and convenience. If an hardware error occurs during the commit phase,
there is no need to report it outside the DSA driver itself.

Make the DSA port_fdb_add routine return void for explicitness.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The DSA layer doesn't care about the return code of the port_stp_update
routine, so make it void in the layer and the DSA drivers.

Replace the useless dsa_slave_stp_update function with a
dsa_slave_stp_state function used to reply to the switchdev
SWITCHDEV_ATTR_ID_PORT_STP_STATE attribute.

In the meantime, rename port_stp_update to port_stp_state_set to
explicit the state change.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

By adding support for bridge operations, FDB operations, and optionally
VLAN operations (for 802.1Q and VLAN filtering aware systems), the
switch bridges ports correctly, the CPU is able to populate the hardware
address databases, and thus hardware bridging becomes functional within
the 88E6185 family of switches.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The 88E6185 switch also has a MapDA bit in its Port Control 2 register.
When this bit is cleared, all frames are sent out to the CPU port.

Set this bit to rely on address databases (ATU) hits and direct frames
out of the correct ports, and thus allow hardware bridging.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The 6185 family of devices has only 256 address databases. Their 8-bit
FID for ATU and VTU operations are split into ATU Control and ATU/VTU
Operation registers.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Marvell switch chips have different number of address databases.

The code currently only supports models with 4096 databases. Such switch
has dedicated FID registers for ATU and VTU operations. Models with
fewer databases have their FID split in several registers.

List them all but only support models with 4096 databases at the moment.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Only switch families with 4096 address databases have dedicated FID
registers for ATU and VTU operations.

Factorize the access to the GLOBAL_ATU_FID register and introduce a
mv88e6xxx_has_fid_reg() helper function to protect the access to
GLOBAL_ATU_FID and GLOBAL_VTU_FID.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Introduce a mv88e6xxx_has_stu() helper to protect the access to the
GLOBAL_VTU_SID register, instead of checking switch families.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Some of the vendor-specific bootloaders set up this part
of the initialization for us, so this was never added.
However, since upstream bootloaders don't initialize the
chip specifically, they leave the fiber MII's PDOWN flag
set, which means that the CPU port doesn't connect.

This patch checks whether this flag has been clear prior
by something else, and if not make us clear it.
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NPatrick Uiterwijk <patrick@puiterwijk.org>
Tested-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add versions of the phy_page_read and _write functions to
be used in a context where the SMI mutex is held.
Tested-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NPatrick Uiterwijk <patrick@puiterwijk.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

netdev_upper_dev_unlink() which notifies NETDEV_CHANGEUPPER, returns
void, as well as del_nbp(). So there's no advantage to catch an eventual
error from the port_bridge_leave routine at the DSA level.

Make this routine void for the DSA layer and its existing drivers.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Rename DSA port_join_bridge and port_leave_bridge routines to
respectively port_bridge_join and port_bridge_leave in order to respect
an implicit Port::Bridge namespace.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

All the drivers support multiple chips, but mv88e6123_61_65 is the
only one that reflects this in its naming. Change it to be consistent
with the other drivers.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

There is no need to change the 802.1Q port mode for the same value.
Thus avoid such message:

    [  401.954836] dsa dsa@0 lan0: 802.1Q Mode: Disabled (was Disabled)
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The port register 0x07 contains more options than just the default VID,
even though they are not used yet. So prefer a read then write operation
over a direct write.

This also allows to keep track of the change through dynamic debug.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Apply a few non-functional changes on the port state setter:

  * add a dynamic debug message with state names to track changes
  * explicit states checking instead of assuming their numeric values
  * lock mutex only once when changing several port states
  * use bitmap macros to declare and access port_state_update_mask
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Implement port_vlan_filtering in the driver to toggle the related port
802.1Q mode between DISABLED and SECURE, on user request.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Now that ports isolation is correctly configured when joining or leaving
a bridge, there is no need to rely on reserved VLANs to isolate
unbridged ports anymore. Thus remove them, and disable 802.1Q on setup.

This restores the expected behavior of hardware bridging for systems
without 802.1Q or VLAN filtering enabled.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The In Chip Port Based VLAN Table contains bits used to restrict which
output ports this input port can send frames to.

With the VLAN filtering enabled, these tables work in conjunction with
the VLAN Table Unit to allow egressing frames.

In order to remove the current dependency to BRIDGE_VLAN_FILTERING for
basic hardware bridging to work, it is necessary to restore a fine
control of each port's VLANTable, on setup and when a port joins or
leaves a bridge.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Give a new bridge a fresh FDB, assign it to its members, and restore a
fresh FDB to a port leaving a bridge.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Restore per-port FDB. Assign them on setup, allow adding and deleting
addresses into them, and dump them.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add a _mv88e6xxx_fid_new function which gives and flushes the lowest FID
available. Call it when preparing a new VTU entry.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Move out the code which dumps a single FDB to its own function.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Rename _mv88e6xxx_vlan_init in _mv88e6xxx_vtu_new, eventually called
from a new _mv88e6xxx_vtu_get function, which abstracts the VTU GetNext
VID-1 trick to retrieve a single entry.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Remove the port_pvid_get and vlan_getnext functions in favor of a
simpler mv88e6xxx_port_vlan_dump function.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The DSA drivers now have access to the VLAN prepare phase and the bridge
net_device. It is easier to check for overlapping bridges from within
the driver. Thus add such check in mv88e6xxx_port_vlan_prepare.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Some DSA drivers may or may not support multiple software bridges on top
of an hardware switch.

It is more convenient for them to access the bridge's net_device for
finer configuration.

Removing the need to craft and access a bitmask also simplifies the
code.

This patch changes the signature of bridge related functions, update DSA
drivers, and removes dsa_slave_br_port_mask.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add a per-port mv88e6xxx_priv_port structure to store per-port related
data, instead of adding several arrays of DSA_MAX_PORTS elements in the
mv88e6xxx_priv_state structure.

It currently only contains the port STP state.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The Marvell 88E6240 has been tested successfully without further
changes. Add entry to the table of supported devices.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

BRIDGE_VLAN_FILTERING automatically adds a newly bridged port to the
VLAN with the bridge's default_pvid.

The mv88e6xxx driver currently reserves VLANs 4000+ for unbridged ports
isolation. When a port joins a bridge, it leaves its reserved VLAN. When
a port leaves a bridge, it joins again its reserved VLAN.

But if the VLAN filtering is disabled, or if this hardware VLAN is
already in use, the bridged port ends up with no default VLAN, and the
communication with the CPU is thus broken.

To fix this, make a port join its reserved VLAN once on setup, never
leave it, and restore its PVID after another one was eventually used.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The current bridge code calls switchdev_port_obj_del on a VLAN port even
if the corresponding switchdev_port_obj_add call returned -EOPNOTSUPP.

If the DSA driver doesn't return -EOPNOTSUPP for a software port VLAN in
its port_vlan_del function, the VLAN is not deleted. Unbridging the port
also generates a stack trace for the same reason.

This can be quickly tested on a VLAN filtering enabled system with:

    # brctl addbr br0
    # brctl addif br0 lan0
    # brctl addbr br1
    # brctl addif br1 lan1
    # brctl delif br1 lan1

Both bridges have a default default_pvid set to 1. lan0 uses the
hardware VLAN 1 while lan1 falls back to the software VLAN 1.

Unbridging lan1 does not delete its software VLAN, and thus generates
the following stack trace:

    [ 2991.681705] device lan1 left promiscuous mode
    [ 2991.686237] br1: port 1(lan1) entered disabled state
    [ 2991.725094] ------------[ cut here ]------------
    [ 2991.729761] WARNING: CPU: 0 PID: 869 at net/bridge/br_vlan.c:314 __vlan_group_free+0x4c/0x50()
    [ 2991.738437] Modules linked in:
    [ 2991.741546] CPU: 0 PID: 869 Comm: ip Not tainted 4.4.0 #16
    [ 2991.747039] Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
    [ 2991.753511] Backtrace:
    [ 2991.756008] [<80014450>] (dump_backtrace) from [<8001469c>] (show_stack+0x20/0x24)
    [ 2991.763604]  r6:80512644 r5:00000009 r4:00000000 r3:00000000
    [ 2991.769343] [<8001467c>] (show_stack) from [<80268e44>] (dump_stack+0x24/0x28)
    [ 2991.776618] [<80268e20>] (dump_stack) from [<80025568>] (warn_slowpath_common+0x98/0xc4)
    [ 2991.784750] [<800254d0>] (warn_slowpath_common) from [<80025650>] (warn_slowpath_null+0x2c/0x34)
    [ 2991.793557]  r8:00000000 r7:9f786a8c r6:9f76c440 r5:9f786a00 r4:9f68ac00
    [ 2991.800366] [<80025624>] (warn_slowpath_null) from [<80512644>] (__vlan_group_free+0x4c/0x50)
    [ 2991.808946] [<805125f8>] (__vlan_group_free) from [<80514488>] (nbp_vlan_flush+0x44/0x68)
    [ 2991.817147]  r4:9f68ac00 r3:9ec70000
    [ 2991.820772] [<80514444>] (nbp_vlan_flush) from [<80506f08>] (del_nbp+0xac/0x130)
    [ 2991.828201]  r5:9f56f800 r4:9f786a00
    [ 2991.831841] [<80506e5c>] (del_nbp) from [<8050774c>] (br_del_if+0x40/0xbc)
    [ 2991.838724]  r7:80590f68 r6:00000000 r5:9ec71c38 r4:9f76c440
    [ 2991.844475] [<8050770c>] (br_del_if) from [<80503dc0>] (br_del_slave+0x1c/0x20)
    [ 2991.851802]  r5:9ec71c38 r4:9f56f800
    [ 2991.855428] [<80503da4>] (br_del_slave) from [<80484a34>] (do_setlink+0x324/0x7b8)
    [ 2991.863043] [<80484710>] (do_setlink) from [<80485e90>] (rtnl_newlink+0x508/0x6f4)
    [ 2991.870616]  r10:00000000 r9:9ec71ba8 r8:00000000 r7:00000000 r6:9f6b0400 r5:9f56f800
    [ 2991.878548]  r4:8076278c
    [ 2991.881110] [<80485988>] (rtnl_newlink) from [<80484048>] (rtnetlink_rcv_msg+0x18c/0x22c)
    [ 2991.889315]  r10:9f7d4e40 r9:00000000 r8:00000000 r7:00000000 r6:9f7d4e40 r5:9f6b0400
    [ 2991.897250]  r4:00000000
    [ 2991.899814] [<80483ebc>] (rtnetlink_rcv_msg) from [<80497c74>] (netlink_rcv_skb+0xb0/0xcc)
    [ 2991.908104]  r8:00000000 r7:9f7d4e40 r6:9f7d4e40 r5:80483ebc r4:9f6b0400
    [ 2991.914928] [<80497bc4>] (netlink_rcv_skb) from [<80483eb4>] (rtnetlink_rcv+0x34/0x3c)
    [ 2991.922874]  r6:9f5ea000 r5:00000028 r4:9f7d4e40 r3:80483e80
    [ 2991.928622] [<80483e80>] (rtnetlink_rcv) from [<80497604>] (netlink_unicast+0x180/0x200)
    [ 2991.936742]  r4:9f4edc00 r3:80483e80
    [ 2991.940362] [<80497484>] (netlink_unicast) from [<80497a88>] (netlink_sendmsg+0x33c/0x350)
    [ 2991.948648]  r8:00000000 r7:00000028 r6:00000000 r5:9f5ea000 r4:9ec71f4c
    [ 2991.955481] [<8049774c>] (netlink_sendmsg) from [<80457ff0>] (sock_sendmsg+0x24/0x34)
    [ 2991.963342]  r10:00000000 r9:9ec71e28 r8:00000000 r7:9f1e2140 r6:00000000 r5:00000000
    [ 2991.971276]  r4:9ec71f4c
    [ 2991.973849] [<80457fcc>] (sock_sendmsg) from [<80458af0>] (___sys_sendmsg+0x1fc/0x204)
    [ 2991.981809] [<804588f4>] (___sys_sendmsg) from [<804598d0>] (__sys_sendmsg+0x4c/0x7c)
    [ 2991.989640]  r10:00000000 r9:9ec70000 r8:80010824 r7:00000128 r6:7ee946c4 r5:00000000
    [ 2991.997572]  r4:9f1e2140
    [ 2992.000128] [<80459884>] (__sys_sendmsg) from [<80459918>] (SyS_sendmsg+0x18/0x1c)
    [ 2992.007725]  r6:00000000 r5:7ee9c7b8 r4:7ee946e0
    [ 2992.012430] [<80459900>] (SyS_sendmsg) from [<80010660>] (ret_fast_syscall+0x0/0x3c)
    [ 2992.020182] ---[ end trace 5d4bc29f4da04280 ]---

To fix this, return -EOPNOTSUPP in _mv88e6xxx_port_vlan_del instead of
-ENOENT if the hardware VLAN doesn't exist or the port is not a member.
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Tested-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Currently the port based VLAN maps should be configured to allow every
port to egress frames on all other ports, except themselves.

The debugfs interface shows that they are misconfigured. For instance, a
7-port switch has the following content in the related register 0x06:

       GLOBAL GLOBAL2 SERDES   0    1    2    3    4    5    6
    ...
    6:  1fa4    1f0f       4   7f   7e   7d   7c   7b   7a   79
    ...

This means that port 3 is allowed to talk to port 2-6, but cannot talk
to ports 0 and 1. With this fix, port 3 can correctly talk to all ports
except 3 itself:

       GLOBAL GLOBAL2 SERDES   0    1    2    3    4    5    6
    ...
    6:  1fa4    1f0f       4   7e   7d   7b   77   6f   5f   3f
    ...

Fixes: ede8098d ("net: dsa: mv88e6xxx: bridges do not need an FID")
Reported-by: NKevin Smith <kevin.smith@elecsyscorp.com>
Signed-off-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Tested-by: NKevin Smith <kevin.smith@elecsyscorp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Since commit 76e398a6 ("net: dsa: use switchdev obj for VLAN add/del
ops"), the Marvell 88E6xxx switch has been unable to pass traffic
between ports - any received traffic is discarded by the switch.
Taking a port out of bridge mode and configuring a vlan on it also the
port to start passing traffic.

With the debugfs files re-instated to allow debug of this issue by
comparing the register settings between the working and non-working
case, the reason becomes clear:

     GLOBAL GLOBAL2 SERDES   0    1    2    3    4    5    6
- 7:  1111    707f    2001     2    2    2    2    2    0    2
+ 7:  1111    707f    2001     1    1    1    1    1    0    1

Register 7 for the ports is the default vlan tag register, and in the
non-working setup, it has been set to 2, despite vlan 2 not being
configured.  This causes the switch to drop all packets coming in to
these ports.  The working setup has the default vlan tag register set
to 1, which is the default vlan when none is configured.

Inspection of the code reveals why.  The code prior to this commit
was:

-		for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
...
-			if (!err && vlan->flags & BRIDGE_VLAN_INFO_PVID)
-				err = ds->drv->port_pvid_set(ds, p->port, vid);

but the new code is:

+	for (vid = vlan->vid_begin; vid <= vlan->vid_end; ++vid) {
...
+	}
...
+	if (pvid)
+		err = _mv88e6xxx_port_pvid_set(ds, port, vid);

This causes the new code to always set the default vlan to one higher
than the old code.

Fix this.

Fixes: 76e398a6 ("net: dsa: use switchdev obj for VLAN add/del ops")
Cc: <stable@vger.kernel.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The 6320 family of switch chips has a second bank for statistics, but
is missing three statistics in the port registers. Generalise and
extend the code:

* adding a field to the statistics table indicating the bank/register
  set where each statistics is.
* add a function indicating if an individual statistics
  is available on this device
* calculate at run time the sset_count.
* return strings based on the available statistics of the device
* return statistics based on the available statistics of the device
* Add support for reading from the second bank.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The device tree binding now allows a gpio to be specified which is
attached to the switch chips reset line. If it is defined, perform
a hardware reset on the switch during setup.
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

To align with the mv88e6xxx code, use the register defines to
access all the register addresses and bit fields.
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

To align with the mv88e6xxx code, add a similar header file
with all the register defines.
The file is based on the mv88e6xxx header for coherency.
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Acked-by: NVivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

According to the mv88e6060 datasheet, the first mac byte must
be at position 9 instead of 8 since the bit 8 is used to select
if the mac address must differ for each port for Pause frames.
Use the correct shift and set the same mac address for all port.
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

According to the mv88e6060 datasheet, the MaxFrameSize bit position
is 10 instead of 11 which is reserved.
Use the bit correctly to setup max frame size to 1536.
Acked-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>