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49fd3b645d
Implement support for ethtool_ops::reset in order to reset transceiver modules. The module backing the netdev is reset when the 'ETH_RESET_PHY' flag is set. After a successful reset, the flag is cleared by the driver and other flags are ignored. This is in accordance with the interface documentation: "The reset() operation must clear the flags for the components which were actually reset. On successful return, the flags indicate the components which were not reset, either because they do not exist in the hardware or because they cannot be reset independently. The driver must never reset any components that were not requested." Reset is useful in order to allow a module to transition out of a fault state. From section 6.3.2.12 in CMIS 5.0: "Except for a power cycle, the only exit path from the ModuleFault state is to perform a module reset by taking an action that causes the ResetS transition signal to become TRUE (see Table 6-11)". An error is returned when the netdev is administratively up: # ip link set dev swp11 up # ethtool --reset swp11 phy ETHTOOL_RESET 0x40 Cannot issue ETHTOOL_RESET: Invalid argument # ip link set dev swp11 down # ethtool --reset swp11 phy ETHTOOL_RESET 0x40 Components reset: 0x40 An error is returned when the module is shared by multiple ports (split ports) and the "phy-shared" flag is not set: # devlink port split swp11 count 4 # ethtool --reset swp11s0 phy ETHTOOL_RESET 0x40 Cannot issue ETHTOOL_RESET: Invalid argument # ethtool --reset swp11s0 phy-shared ETHTOOL_RESET 0x400000 Components reset: 0x400000 # devlink port unsplit swp11s0 # ethtool --reset swp11 phy ETHTOOL_RESET 0x40 Components reset: 0x40 An error is also returned when one of the ports using the module is administratively up: # devlink port split swp11 count 4 # ip link set dev swp11s1 up # ethtool --reset swp11s0 phy-shared ETHTOOL_RESET 0x400000 Cannot issue ETHTOOL_RESET: Invalid argument # ip link set dev swp11s1 down # ethtool --reset swp11s0 phy-shared ETHTOOL_RESET 0x400000 Components reset: 0x400000 Reset is performed by writing to the "rst" bit of the PMAOS register, which instructs the firmware to assert the reset signal connected to the module for a fixed amount of time. Signed-off-by: Ido Schimmel <idosch@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.