i40evf: prevent VF close returning before state transitions to DOWN

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Currently i40evf_close() can return before state transitions to
__I40EVF_DOWN because of the latency involved in processing and
receiving response from PF driver and scheduling of VF watchdog_task.
Due to this inconsistency an immediate call to i40evf_open() fails
because state is still DOWN_PENDING.

When a VF interface is in up state and we try to add it as slave,
The bonding driver calls dev_close() and dev_open() in short duration
resulting in dev_open returning error. The ifenslave command needs
to be run again for dev_open to succeed.

This fix ensures that watchdog timer is scheduled immediately after
admin queue operations are scheduled in i40evf_down(). In addition a
wait condition is added at the end of i40evf_close so that function
wont return when state is still DOWN_PENDING. The timeout value is
chosen after some profiling and includes some buffer.

Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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This commit is contained in:

Sudheer Mogilappagari 2017-06-23 04:24:44 -04:00 • committed by Jeff Kirsher

parent 1e3a5fd5c0

commit fe2647ab0c

3 changed files with 24 additions and 1 deletions

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2

drivers/net/ethernet/intel/i40evf/i40evf.h

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19

drivers/net/ethernet/intel/i40evf/i40evf_main.c

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4

drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c

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