Commits
Murali Karicheri committed ca6d920cd3e
prueth: support run time change of protocol at pru Ethernet device
The ICSS PRU is capable of running different firmware to support
various industrial Ethernet protocols. This requires a capability
to configure and run a specific protocol at PRU from user space.
The ethtool command already provide -K option to allow offload
features to hardware. Use this facility to allow offload of
HSR/PRP or any future protocol offload to firmware and there by
allow user to bring up Ethernet with a specific protocol running
at firmware. If user would like to run plain Ethernet using EMAC
firmware, user may switch off the offload using ethtool -K option
and bring up Ethernet interface using EMAC firmware.
Here is an example sequence to switch from EMAC to HSR assuming
eth2 and eth3 are in use.
ifconfig eth3 0.0.0.0 down
ethtool -K eth2 hsr-rx-offload on
ethtool -K eth3 hsr-rx-offload on
ifconfig eth2 hw ether <LRE MAC>
ifconfig eth3 hw ether <LRE MAC>
ip link add name hsr0 type hsr .....
Similarly to switch from HSR to PRP, user may do
ip link delete hsr0
ifconfig eth2 down
ifconfig eth3 down
ethtool -K eth2 hsr-rx-offload off
ethtool -K eth3 hsr-rx-offload off
ethtool -K eth2 prp-rx-offload on
ethtool -K eth3 prp-rx-offload on
ifconfig eth2 hw ether <LRE MAC>
ifconfig eth3 hw ether <LRE MAC>
ip link add name prp0 type prp ....
Similar way, user may switch from PRP to HSR or EMAC and so on.
To support this functionality, move some of the code related to
Host or Port configuration from probe() to ndo_open(). The Ethernet
device configuration or initialization consists of initializing the
Host specific part followed by port specific part. Since the
Host specific configuration/init is common across both ports,
it is required to protect this code through a mutex to make
sure concurrent ndo device open happens properly. i.e second net
device open wait for the common initialization to be complete before
proceeding to initialize its own port. The variable, emac_configured,
is used to skip the common code when second device is opened.
Additional implement ndo ops, emac_ndo_fix_features() and
emac_ndo_set_features() to support ethtool -K option and keep separate
variables for storing switch/emac irqs so that device can use it
based on eth_tye without having to parse the DTS everytime.
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>