Convert read-modify-write sequences in at803x, Marvell and core phylib
to use phy_modify() to ensure safety.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add phy_modify() convenience accessor to complement the mdiobus
counterpart.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

For paged accesses to be truely safe, we need to hold the bus lock to
prevent anyone else gaining access to the registers while we modify
them.

The phydev->lock mutex does not do this: userspace via the MII ioctl
can still sneak in and read or write any register while we are on a
different page, and the suspend/resume methods can be called by a
thread different to the thread polling the phy status.

Races have been observed with mvneta on SolidRun Clearfog with phylink,
particularly between the phylib worker reading the PHYs status, and
the thread resuming mvneta, calling phy_start() which then calls
through to m88e1121_config_aneg_rgmii_delays(), which tries to
read-modify-write the MSCR register:

	CPU0			CPU1
	marvell_read_status_page()
	marvell_set_page(phydev, MII_MARVELL_FIBER_PAGE)
	...
				m88e1121_config_aneg_rgmii_delays()
				set_page(MII_MARVELL_MSCR_PAGE)
				phy_read(phydev, MII_88E1121_PHY_MSCR_REG)
	marvell_set_page(phydev, MII_MARVELL_COPPER_PAGE);
	...
				phy_write(phydev, MII_88E1121_PHY_MSCR_REG)

The result of this is we end up writing the copper page register 21,
which causes the copper PHY to be disabled, and the link partner sees
the link immediately go down.

Solve this by taking the bus lock instead of the PHY lock, thereby
preventing other accesses to the PHY while we are accessing other PHY
pages.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a set of paged phy register accessors which are inherently safe in
their design against other accesses interfering with the paged access.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add unlocked versions of the bus accessors, which allows access to the
bus with all the tracing. These accessors validate that the bus mutex
is held, which is a basic requirement for all mii bus accesses.

Also added is a read-modify-write unlocked accessor with the same
locking requirements.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use unlocked accessors for indirect MMD accesses to clause 22 PHYs.
This permits tracing of these accesses.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add unlocked versions of the bus accessors, which allows access to the
bus with all the tracing. These accessors validate that the bus mutex
is held, which is a basic requirement for all mii bus accesses.

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Collect TX rate limiting related information in UP CIM logs.

Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Russell King says:

====================
Convert mvneta to phylink

This series converts mvneta to use phylink, which is necessary to
support the SFP cages on SolidRun's Clearfog platform.  This series just
converts mvneta without adding the DT parts - having discussed with
Andrew, we believe we're too close to the merge window to submit that
patch.

I've split the "net: mvneta: convert to phylink" patch up to make it
easier to review, and in doing so, spotted some minor corner cases that
needed to be fixed along the way.

This series depends on the previously merged phylink patches in netdev,
along with the recently reviewed 7 patch series "Resolve races in phy
accessors" without which, the race described in patch 5 of that series
is very evident when triggering a dummy hibernate cycle.

This series also illustrates how to convert mvpp2 to phylink.

mvneta is the only user of the fixed_phy_update_state() API, and this
becomes redundant with the conversion.

It would be good to get this series not only reviewed, but also
independently tested to ensure that I haven't missed anything - I only
have the Clearfog platform to test on, and that doesn't support all the
different interface modes that mvneta supports.

A particularly interesting side effect of this series is that DSA
switches no longer need the "CPU" port and DSA facing MAC ethernet
instance to be marked as a fixed link anymore with mvneta - we can use
1000BaseX mode, and the DSA to CPU link will use the 802.3z negotiation
to determine the link properties without needing the link parameters to
be explicitly stated in DT - that is a subject of a future patch.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

mvneta is the only user of fixed_phy_update_state(), which has been
converted to use phylink instead.  Remove fixed_phy_update_state().

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for reading the SFF module's EEPROM via the ethtool API.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

The PSC sync change interrupt can fire multiple times while the link is
down, which is caused by noise on the serdes lines. As this isn't
information we make use of, it's pointless having the interrupt enabled.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for EEE to mvneta.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for flow control to mvneta.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for 1000BaseX link modes.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Move the port configuration and release of reset to mvneta_mac_config()
along side the rest of the port mode configuration.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Convert mvneta to use phylink, which models the MAC to PHY link in
a generic, reusable form.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

- remove unused sync status

Signed-off-by: David S. Miller <davem@davemloft.net>

Prepare to convert mvneta to phylink by splitting the adjust_link
function into its consituent parts.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

The netdev core always ensures that the rtnl lock is held while calling
the ndo_open() and ndo_stop() methods. However, the suspend/resume paths
do not hold the rtnl lock. phylink will expect the rtnl lock to be held
when the MAC driver calls it, so we end up with kernel warnings. Take
the lock to ensure that these functions are called in a consistent
manner.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Sergei Shtylyov says:

====================
Kill redundant checks in the Renesas Ethernet drivers

Here's a set of 2 patches against DaveM's 'net-next.git' repo removing
redundant checks in the driver probe() methods.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Browsing thru the driver disassembly, I noticed that gcc was  able to
figure  out  that the 'ndev' pointer is always non-NULL when calling
free_netdev()  on the probe() method's  error path and  thus skip that
redundant NULL check... gcc is smart, be like gcc! :-)

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

Browsing thru the driver disassembly, I noticed that gcc was  able to
figure  out  that the 'ndev' pointer is always non-NULL when calling
free_netdev()  on the probe() method's  error path and  thus skip that
redundant NULL check... gcc is smart, be like gcc! :-)

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use vzalloc for allocating zeroed memory and remove unnecessary
memset function.

Done using Coccinelle.
Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
0-day tested with no failures.

Suggested-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use dma_zalloc_coherent for allocating zeroed
memory and remove unnecessary memset function.

Done using Coccinelle.
Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
0-day tested with no failures.

Suggested-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use dma_zalloc_coherent and vzalloc for allocating zeroed
memory and remove unnecessary memset function.

Done using Coccinelle.
Generated-by: scripts/coccinelle/api/alloc/kzalloc-simple.cocci
0-day tested with no failures.

Suggested-by: Luis R. Rodriguez <mcgrof@kernel.org>
Signed-off-by: Himanshu Jha <himanshujha199640@gmail.com>
Acked-by: Tomer Tayar <Tomer.Tayar@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Florian Fainelli says:

====================
net: stmmac: Couple of debug prints improvements

While working on a particular problem, I had to turn on debug prints and found
them to be useful, but could deserve some improvements in order to help debug
situations.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

There is no reason not to allow printing the frame_len/COE value and put
that under a check for ETH_FRAME_LEN, drop it so we can see what the
descriptor reports.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Make the printing of the ring number consistent and properly aligned by
padding the ring number with up to 3 zeroes, which covers the maximum
ring size. This makes it a lot easier to see outliers in debug prints.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We need to make the dsa_legacy_register() stub return 0 in order for
dsa_init_module() to successfully register and continue registering the
ETH_P_XDSA packet handler.

Fixes: 2a93c1a3 ("net: dsa: Allow compiling out legacy support")
Reported-by: Egil Hjelmeland <privat@egil-hjelmeland.no>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Russell King says:

====================
further sfp/phylink updates

This series:
- cleans up printing of module information
- improves the transceiver capability decoding, getting rid of the
  guessing by connector type, improves direct-attach cable support
  and adds support for 1G Base-PX and Base-BX10 modules.
- cleans up phylink_sfp_module_insert()
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

'mode' is actually constant through phylink_sfp_module_insert(), so
remove it and replace it with the enumerated constant.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Improve the support for direct-attach copper so that we avoid kernel
warning messages, and report the appropriate PORT_DA type to userspace.
Direct Attach cables can use a number of protocols depending on their
range of speeds.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for decoding the transceiver information for 1000Base-PX and
1000Base-BX10.  These use 1000BASE-X protocol.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Don't try to guess the support mask from the connector type - this is
mostly irrelevant to the speeds that the transceiver supports.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Rather than memcpy()'ing the strings and null terminate them, printf
allows non-NULL terminated strings provided the precision is not more
than the size of the buffer.  Use this form to print the basic module
information rather than copying and terminating the strings.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

Russell King says:

====================
marvell10g updates

This series:
- adds MDI/MDIX reporting
- adds support for 10/100Mbps half-duplex link modes
- adds a comment describing the setup on VF610 ZII boards (where
  the phy interface mode doesn't change.)
- cleans up the phy interace mode switching
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Add support for half-duplex 100M and 10M copper connections by parsing
the advertisment results rather than trying to decode the negotiated
speed from one of the PHYs "vendor" registers.  This allows us to
decode the duplex as well, which means we can support half-duplex mode
for the slower speeds.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add a helper to convert the result of the autonegotiation advertisment
into the PHYs speed and duplex settings.  If the result is full duplex,
also extract the pause mode settings from the link partner advertisment.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Centralise the PHY interface mode switching, rather than having it in
two places.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add reporting of the MDI swap to the Marvell 10G PHY driver by providing
a generic implementation for the standard 10GBASE-T pair swap register
and polarity register.  We also support reading the MDI swap status for
1G and below from a PCS register.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>