On Tue, Nov 24, 2020 at 01:14:31AM +0100, Andrew Lunn wrote: > On Mon, Nov 23, 2020 at 10:06:16PM +0000, Russell King wrote: > > Add debugfs support to SFP so that the internal state of the SFP state > > machines and hardware signal state can be viewed from userspace, rather > > than having to compile a debug kernel to view state state transitions > > in the kernel log. The 'state' output looks like: > > > > Module state: empty > > Module probe attempts: 0 0 > > Device state: up > > Main state: down > > Fault recovery remaining retries: 5 > > PHY probe remaining retries: 12 > > moddef0: 0 > > rx_los: 1 > > tx_fault: 1 > > tx_disable: 1 > > > > Signed-off-by: Russell King <rmk+ker...@armlinux.org.uk> > > Hi Russell > > This looks useful. I always seem to end up recompiling the kernel, > which as you said, this should avoid.
FWIW, another option is to use drgn [1]. Especially when the state is queried from the kernel and not hardware. We are using that in mlxsw [2][3]. [1] https://github.com/osandov/drgn [2] https://github.com/Mellanox/mlxsw/blob/master/Debugging/hdroom_dump.txt [3] https://github.com/Mellanox/mlxsw/blob/master/Debugging/hdroom_dump.py
