e1000e: factor out systim sanitization

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 using a feature (bug) flag, per
suggestion from Jesse Brandeburg.

Littering functional code with device-specific checks is much messier than
simply checking a flag, and having device-specific init set flags as needed.
There are probably a number of other cases in the e1000e code that
could/should be converted similarly.

Suggested-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ethernet/intel/e1000e/82571.c b/drivers/net/ethernet/intel/e1000e/82571.c
index 7fd4d54..6b03c85 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/82571.c
+++ b/drivers/net/ethernet/intel/e1000e/82571.c
@@ -2032,7 +2032,8 @@ const struct e1000_info e1000_82574_info = {
                                  | FLAG2_DISABLE_ASPM_L0S
                                  | FLAG2_DISABLE_ASPM_L1
                                  | FLAG2_NO_DISABLE_RX
-                                 | FLAG2_DMA_BURST,
+                                 | FLAG2_DMA_BURST
+                                 | FLAG2_CHECK_SYSTIM_OVERFLOW,
        .pba                    = 32,
        .max_hw_frame_size      = DEFAULT_JUMBO,
        .get_variants           = e1000_get_variants_82571,
@@ -2053,7 +2054,8 @@ const struct e1000_info e1000_82583_info = {
                                  | FLAG_HAS_CTRLEXT_ON_LOAD,
        .flags2                 = FLAG2_DISABLE_ASPM_L0S
                                  | FLAG2_DISABLE_ASPM_L1
-                                 | FLAG2_NO_DISABLE_RX,
+                                 | FLAG2_NO_DISABLE_RX
+                                 | FLAG2_CHECK_SYSTIM_OVERFLOW,
        .pba                    = 32,
        .max_hw_frame_size      = DEFAULT_JUMBO,
        .get_variants           = e1000_get_variants_82571,

diff --git a/drivers/net/ethernet/intel/e1000e/e1000.h b/drivers/net/ethernet/intel/e1000e/e1000.h
index ef96cd1..879cca4 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/e1000.h
+++ b/drivers/net/ethernet/intel/e1000e/e1000.h
@@ -452,6 +452,7 @@ s32 e1000e_get_base_timinca(struct e1000_adapter *adapter, u32 *timinca);
 #define FLAG2_PCIM2PCI_ARBITER_WA         BIT(11)
 #define FLAG2_DFLT_CRC_STRIPPING          BIT(12)
 #define FLAG2_CHECK_RX_HWTSTAMP           BIT(13)
+#define FLAG2_CHECK_SYSTIM_OVERFLOW       BIT(14)
 
 #define E1000_RX_DESC_PS(R, i)     \
        (&(((union e1000_rx_desc_packet_split *)((R).desc))[i]))

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index 02f4439..7017281 100644 (file)
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -4302,6 +4302,42 @@ void e1000e_reinit_locked(struct e1000_adapter *adapter)
        clear_bit(__E1000_RESETTING, &adapter->state);
 }
 
+/**
+ * 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
@@ -4335,33 +4371,9 @@ 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 (adapter->flags2 & FLAG2_CHECK_SYSTIM_OVERFLOW)
+               systim = e1000e_sanitize_systim(hw, systim);
 
-                       if ((time_delta < E1000_82574_SYSTIM_EPSILON) &&
-                           (rem == 0))
-                               break;
-               }
-       }
        return systim;
 }