linux-stable.git/drivers/net/phy, branch v6.5.3

net: phy: Fix deadlocking in phy_error() invocation

2023-08-19T18:26:50+00:00

Since commit 91a7cda1f4b8 ("net: phy: Fix race condition on link status
change") all the phy_error() method invocations have been causing the
nested-mutex-lock deadlock because it's normally done in the PHY-driver
threaded IRQ handlers which since that change have been called with the
phydev->lock mutex held. Here is the calls thread:

IRQ: phy_interrupt()
     +-> mutex_lock(&phydev->lock); <--------------------+
         drv->handle_interrupt()                         | Deadlock due
         +-> ERROR: phy_error()                          + to the nested
                    +-> phy_process_error()              | mutex lock
                        +-> mutex_lock(&phydev->lock); <-+
                            phydev->state = PHY_ERROR;
                            mutex_unlock(&phydev->lock);
         mutex_unlock(&phydev->lock);

The problem can be easily reproduced just by calling phy_error() from any
PHY-device threaded interrupt handler. Fix it by dropping the phydev->lock
mutex lock from the phy_process_error() method and printing a nasty error
message to the system log if the mutex isn't held in the caller execution
context.

Note for the fix to work correctly in the PHY-subsystem itself the
phydev->lock mutex locking must be added to the phy_error_precise()
function.

Link: https://lore.kernel.org/netdev/20230816180944.19262-1-fancer.lancer@gmail.com
Fixes: 91a7cda1f4b8 ("net: phy: Fix race condition on link status change")
Suggested-by: Andrew Lunn 
Signed-off-by: Serge Semin 
Reviewed-by: Andrew Lunn 
Signed-off-by: David S. Miller

net: sfp: handle 100G/25G active optical cables in sfp_parse_support

2023-08-19T18:22:14+00:00

Handle extended compliance code 0x1 (SFF8024_ECC_100G_25GAUI_C2M_AOC)
for active optical cables supporting 25G and 100G speeds.

Since the specification makes no statement about transmitter range, and
as the specific sfp module that had been tested features only 2m fiber -
short-range (SR) modes are selected.

The 100G speed is irrelevant because it would require multiple fibers /
multiple SFP28 modules combined under one netdev.
sfp-bus.c only handles a single module per netdev, so only 25Gbps modes
are selected.

sfp_parse_support already handles SFF8024_ECC_100GBASE_SR4_25GBASE_SR
with compatible properties, however that entry is a contradiction in
itself since with SFP(28) 100GBASE_SR4 is impossible - that would likely
be a mode for qsfp modules only.

Add a case for SFF8024_ECC_100G_25GAUI_C2M_AOC selecting 25gbase-r
interface mode and 25000baseSR link mode.
Also enforce SFP28 bitrate limits on the values read from sfp eeprom as
requested by Russell King.

Tested with fs.com S28-AO02 AOC SFP28 module.

Signed-off-by: Josua Mayer 
Reviewed-by: Russell King (Oracle) 
Signed-off-by: David S. Miller

net: phy: broadcom: stub c45 read/write for 54810

2023-08-16T01:53:43+00:00

The 54810 does not support c45. The mmd_phy_indirect accesses return
arbirtary values leading to odd behavior like saying it supports EEE
when it doesn't. We also see that reading/writing these non-existent
MMD registers leads to phy instability in some cases.

Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry")
Signed-off-by: Justin Chen 
Reviewed-by: Florian Fainelli 
Link: https://lore.kernel.org/r/1691901708-28650-1-git-send-email-justin.chen@broadcom.com
Signed-off-by: Jakub Kicinski

net: phy: fix IRQ-based wake-on-lan over hibernate / power off

2023-08-13T11:27:08+00:00

Uwe reports:
"Most PHYs signal WoL using an interrupt. So disabling interrupts [at
shutdown] breaks WoL at least on PHYs covered by the marvell driver."

Discussing with Ioana, the problem which was trying to be solved was:
"The board in question is a LS1021ATSN which has two AR8031 PHYs that
share an interrupt line. In case only one of the PHYs is probed and
there are pending interrupts on the PHY#2 an IRQ storm will happen
since there is no entity to clear the interrupt from PHY#2's registers.
PHY#1's driver will get stuck in .handle_interrupt() indefinitely."

Further confirmation that "the two AR8031 PHYs are on the same MDIO
bus."

With WoL using interrupts to wake the system, in such a case, the
system will begin booting with an asserted interrupt. Thus, we need to
cope with an interrupt asserted during boot.

Solve this instead by disabling interrupts during PHY probe. This will
ensure in Ioana's situation that both PHYs of the same type sharing an
interrupt line on a common MDIO bus will have their interrupt outputs
disabled when the driver probes the device, but before we hook in any
interrupt handlers - thus avoiding the interrupt storm.

A better fix would be for platform firmware to disable the interrupting
devices at source during boot, before control is handed to the kernel.

Fixes: e2f016cf7751 ("net: phy: add a shutdown procedure")
Link: 20230804071757.383971-1-u.kleine-koenig@pengutronix.de
Reported-by: Uwe Kleine-König 
Signed-off-by: Russell King (Oracle) 
Reviewed-by: Andrew Lunn 
Reviewed-by: Florian Fainelli 
Signed-off-by: David S. Miller

net: phy: at803x: remove set/get wol callbacks for AR8032

2023-08-04T09:00:17+00:00

Since the AR8032 part does not support wol, remove related callbacks
from it.

Fixes: 5800091a2061 ("net: phy: at803x: add support for AR8032 PHY")
Signed-off-by: Li Yang 
Cc: David Bauer 
Signed-off-by: David S. Miller

net: phy: at803x: fix the wol setting functions

2023-08-04T09:00:16+00:00

In commit 7beecaf7d507 ("net: phy: at803x: improve the WOL feature"), it
seems not correct to use a wol_en bit in a 1588 Control Register which is
only available on AR8031/AR8033(share the same phy_id) to determine if WoL
is enabled.  Change it back to use AT803X_INTR_ENABLE_WOL for determining
the WoL status which is applicable on all chips supporting wol. Also update
the at803x_set_wol() function to only update the 1588 register on chips
having it.  After this change, disabling wol at probe from commit
d7cd5e06c9dd ("net: phy: at803x: disable WOL at probe") is no longer
needed.  Change it to just disable the WoL bit in 1588 register for
AR8031/AR8033 to be aligned with AT803X_INTR_ENABLE_WOL in probe.

Fixes: 7beecaf7d507 ("net: phy: at803x: improve the WOL feature")
Signed-off-by: Li Yang 
Reviewed-by: Viorel Suman 
Reviewed-by: Wei Fang 
Reviewed-by: Russell King (Oracle) 
Signed-off-by: David S. Miller

net: phy: marvell10g: fix 88x3310 power up

2023-07-23T10:47:07+00:00

Clear MV_V2_PORT_CTRL_PWRDOWN bit to set power up for 88x3310 PHY,
it sometimes does not take effect immediately. And a read of this
register causes the bit not to clear. This will cause mv3310_reset()
to time out, which will fail the config initialization. So add a delay
before the next access.

Fixes: c9cc1c815d36 ("net: phy: marvell10g: place in powersave mode at probe")
Signed-off-by: Jiawen Wu 
Reviewed-by: Russell King (Oracle) 
Signed-off-by: David S. Miller

net: phy: prevent stale pointer dereference in phy_init()

2023-07-20T19:47:25+00:00

mdio_bus_init() and phy_driver_register() both have error paths, and if
those are ever hit, ethtool will have a stale pointer to the
phy_ethtool_phy_ops stub structure, which references memory from a
module that failed to load (phylib).

It is probably hard to force an error in this code path even manually,
but the error teardown path of phy_init() should be the same as
phy_exit(), which is now simply not the case.

Fixes: 55d8f053ce1b ("net: phy: Register ethtool PHY operations")
Link: https://lore.kernel.org/netdev/ZLaiJ4G6TaJYGJyU@shell.armlinux.org.uk/
Suggested-by: Russell King (Oracle) 
Signed-off-by: Vladimir Oltean 
Link: https://lore.kernel.org/r/20230720000231.1939689-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2023-06-27T16:45:22+00:00

Merge in late fixes to prepare for the 6.5 net-next PR.

Signed-off-by: Jakub Kicinski

net: phy: mscc: fix packet loss due to RGMII delays

2023-06-27T16:31:51+00:00

Two deadly typos break RX and TX traffic on the VSC8502 PHY using RGMII
if phy-mode = "rgmii-id" or "rgmii-txid", and no "tx-internal-delay-ps"
override exists. The negative error code from phy_get_internal_delay()
does not get overridden with the delay deduced from the phy-mode, and
later gets committed to hardware. Also, the rx_delay gets overridden by
what should have been the tx_delay.

Fixes: dbb050d2bfc8 ("phy: mscc: Add support for RGMII delay configuration")
Signed-off-by: Vladimir Oltean 
Reviewed-by: Harini Katakam 
Reviewed-by: Simon Horman 
Link: https://lore.kernel.org/r/20230627134235.3453358-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski