igb: use timecompare to implement hardware time stamping

Both TX and RX hardware time stamping are implemented.  Due to
hardware limitations it is not possible to verify reliably which
packet was time stamped when multiple were pending for sending; this
could be solved by only allowing one packet marked for hardware time
stamping into the queue (not implemented yet).

RX time stamping relies on the flag in the packet descriptor which
marks packets that were time stamped. In "all packet" mode this flag
is not set. TODO: also support that mode (even though it'll suffer
from race conditions).

Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index 797a9fe107ad..bb8c35cec1ab 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -35,6 +35,8 @@
 #include "e1000_82575.h"
 
 #include <linux/clocksource.h>
+#include <linux/timecompare.h>
+#include <linux/net_tstamp.h>
 
 struct igb_adapter;
 
@@ -255,6 +257,8 @@ struct igb_adapter {
         struct net_device_stats net_stats;
         struct cyclecounter cycles;
         struct timecounter clock;
+        struct timecompare compare;
+        struct hwtstamp_config hwtstamp_config;
 
         /* structs defined in e1000_hw.h */
         struct e1000_hw hw;