i40e: Add a SW workaround for lost interrupts
authorAnjali Singhai Jain <anjali.singhai@intel.com>
Fri, 15 Jan 2016 22:33:12 +0000 (14:33 -0800)
committerJeff Kirsher <jeffrey.t.kirsher@intel.com>
Thu, 18 Feb 2016 06:44:00 +0000 (22:44 -0800)
commitdd353109e41c1e92e0cea9954404a6f5a7d46218
tree1a7849253faa0c0580f230d96af6c99250692ca9
parentf734dfff2f2bc2d92c392fbcfe2039893a8cdd08
i40e: Add a SW workaround for lost interrupts

This patch adds a workaround for cases where we might have
interrupts that got lost but WB happened.
If that happens without this patch we will see a tx_timeout.
To work around it, this patch goes ahead and reschedules NAPI
in that situation, if NAPI is not already scheduled.
We also add a counter in ethtool to keep track of when
we detect a case of tx_lost_interrupt.

Note: napi_reschedule() can be safely called from process/service_task
context and is done in other drivers as well without an issue.

Change-ID: I00f98f1ce3774524d9421227652bef20fcbd0d20
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
drivers/net/ethernet/intel/i40e/i40e.h
drivers/net/ethernet/intel/i40e/i40e_ethtool.c
drivers/net/ethernet/intel/i40e/i40e_main.c
drivers/net/ethernet/intel/i40e/i40e_txrx.c
drivers/net/ethernet/intel/i40e/i40e_txrx.h
drivers/net/ethernet/intel/i40evf/i40e_txrx.c
drivers/net/ethernet/intel/i40evf/i40e_txrx.h