igb: adjust PTP timestamps for Tx/Rx latency

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Table 7-62 on page 338 of the i210 datasheet lists TX and RX latencies
for the various speeds the chip supports.  To give better PTP timestamp
accuracy, adjust the timestamps by the amounts Intel gives based on
current link speed.

Signed-off-by: Nathan Sullivan <nathan.sullivan@ni.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

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Nathan Sullivan 2016-05-03 18:10:56 -05:00 • committed by Jeff Kirsher

parent ab507c9a54

commit 3f544d2a4d

2 changed files with 44 additions and 0 deletions

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8

drivers/net/ethernet/intel/igb/igb.h

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36

drivers/net/ethernet/intel/igb/igb_ptp.c

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