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[PATCH net-next 1/2] e1000e: factor out systim sanitization

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This is prepatory work for an expanding list of adapter families that have
occasional ~10 hour clock jumps when being used for PTP. Factor out the
sanitization function and convert to a switch statement, rather than using
an if.

CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: intel-wired-lan@lists.osuosl.org
CC: netdev@vger.kernel.org
Signed-off-by: Jarod Wilson <jarod@redhat.com>
---
 drivers/net/ethernet/intel/e1000e/netdev.c | 71 ++++++++++++++++++------------
 1 file changed, 44 insertions(+), 27 deletions(-)

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 41f32c0..955b294 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4303,6 +4303,42 @@ void e1000e_reinit_locked(struct e1000_adapter *adapter)
 }
 
 /**
+ * e1000e_sanitize_systim - sanitize raw cycle counter reads
+ * @hw: pointer to the HW structure
+ * @systim: cycle_t value read, sanitized and returned
+ *
+ * Errata for 82574/82583 possible bad bits read from SYSTIMH/L:
+ * check to see that the time is incrementing at a reasonable
+ * rate and is a multiple of incvalue.
+ **/
+static cycle_t e1000e_sanitize_systim(struct e1000_hw *hw, cycle_t systim)
+{
+	u64 time_delta, rem, temp;
+	cycle_t systim_next;
+	u32 incvalue;
+	int i;
+
+	incvalue = er32(TIMINCA) & E1000_TIMINCA_INCVALUE_MASK;
+	for (i = 0; i < E1000_MAX_82574_SYSTIM_REREADS; i++) {
+		/* latch SYSTIMH on read of SYSTIML */
+		systim_next = (cycle_t)er32(SYSTIML);
+		systim_next |= (cycle_t)er32(SYSTIMH) << 32;
+
+		time_delta = systim_next - systim;
+		temp = time_delta;
+		/* VMWare users have seen incvalue of zero, don't div / 0 */
+		rem = incvalue ? do_div(temp, incvalue) : (time_delta != 0);
+
+		systim = systim_next;
+
+		if ((time_delta < E1000_82574_SYSTIM_EPSILON) && (rem == 0))
+			break;
+	}
+
+	return systim;
+}
+
+/**
  * e1000e_cyclecounter_read - read raw cycle counter (used by time counter)
  * @cc: cyclecounter structure
  **/
@@ -4312,7 +4348,7 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc)
 						     cc);
 	struct e1000_hw *hw = &adapter->hw;
 	u32 systimel, systimeh;
-	cycle_t systim, systim_next;
+	cycle_t systim;
 	/* SYSTIMH latching upon SYSTIML read does not work well.
 	 * This means that if SYSTIML overflows after we read it but before
 	 * we read SYSTIMH, the value of SYSTIMH has been incremented and we
@@ -4335,32 +4371,13 @@ static cycle_t e1000e_cyclecounter_read(const struct cyclecounter *cc)
 	systim = (cycle_t)systimel;
 	systim |= (cycle_t)systimeh << 32;
 
-	if ((hw->mac.type == e1000_82574) || (hw->mac.type == e1000_82583)) {
-		u64 time_delta, rem, temp;
-		u32 incvalue;
-		int i;
-
-		/* errata for 82574/82583 possible bad bits read from SYSTIMH/L
-		 * check to see that the time is incrementing at a reasonable
-		 * rate and is a multiple of incvalue
-		 */
-		incvalue = er32(TIMINCA) & E1000_TIMINCA_INCVALUE_MASK;
-		for (i = 0; i < E1000_MAX_82574_SYSTIM_REREADS; i++) {
-			/* latch SYSTIMH on read of SYSTIML */
-			systim_next = (cycle_t)er32(SYSTIML);
-			systim_next |= (cycle_t)er32(SYSTIMH) << 32;
-
-			time_delta = systim_next - systim;
-			temp = time_delta;
-			/* VMWare users have seen incvalue of zero, don't div / 0 */
-			rem = incvalue ? do_div(temp, incvalue) : (time_delta != 0);
-
-			systim = systim_next;
-
-			if ((time_delta < E1000_82574_SYSTIM_EPSILON) &&
-			    (rem == 0))
-				break;
-		}
+	switch (hw->mac.type) {
+	case e1000_82574:
+	case e1000_82583:
+		systim = e1000e_sanitize_systim(hw, systim);
+		break;
+	default:
+		break;
 	}
 	return systim;
 }
-- 
1.8.3.1

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Thread

[PATCH net] e1000e: fix PTP on e1000_pch_lpt variants Jarod Wilson <jarod@redhat.com> - 2016-07-19 22:30 +0200
  Re: [Intel-wired-lan] [PATCH net] e1000e: fix PTP on e1000_pch_lpt  variants "Rustad, Mark D" <mark.d.rustad@intel.com> - 2016-07-19 22:50 +0200
    Re: [Intel-wired-lan] [PATCH net] e1000e: fix PTP on e1000_pch_lpt  variants Jarod Wilson <jarod@redhat.com> - 2016-07-20 19:10 +0200
  Re: [PATCH net] e1000e: fix PTP on e1000_pch_lpt variants Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2016-07-20 13:10 +0200
  [PATCH net-next 1/2] e1000e: factor out systim sanitization Jarod Wilson <jarod@redhat.com> - 2016-07-23 18:50 +0200
  [PATCH v2 net-next 0/2] e1000e: fix PTP on e1000_pch_variants Jarod Wilson <jarod@redhat.com> - 2016-07-23 18:50 +0200
    [PATCH net-next 2/2] e1000e: fix PTP on e1000_pch_lpt variants Jarod Wilson <jarod@redhat.com> - 2016-07-23 18:50 +0200
    Re: [Intel-wired-lan] [PATCH v2 net-next 0/2] e1000e: fix PTP on  e1000_pch_variants Jesse Brandeburg <jesse.brandeburg@intel.com> - 2016-07-25 20:00 +0200

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