igb: Prevent dropped Tx timestamps via work items and interrupts.
In rare circumstances, it's possible a descriptor writeback will occur
before a timestamped Tx packet will go out on the wire, leading to the
driver believing the hardware failed to timestamp the packet. Schedule a
work item for 82576 and use the available time sync interrupt registers
on 82580 and above to account for this.
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Matthew Vick <matthew.vick@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/igb/e1000_regs.h b/drivers/net/ethernet/intel/igb/e1000_regs.h
index 28394be..faec840 100644
--- a/drivers/net/ethernet/intel/igb/e1000_regs.h
+++ b/drivers/net/ethernet/intel/igb/e1000_regs.h
@@ -91,6 +91,8 @@
#define E1000_TIMINCA 0x0B608 /* Increment attributes register - RW */
#define E1000_TSAUXC 0x0B640 /* Timesync Auxiliary Control register */
#define E1000_SYSTIMR 0x0B6F8 /* System time register Residue */
+#define E1000_TSICR 0x0B66C /* Interrupt Cause Register */
+#define E1000_TSIM 0x0B674 /* Interrupt Mask Register */
/* Filtering Registers */
#define E1000_SAQF(_n) (0x5980 + 4 * (_n))