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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>
This commit is contained in:
Jarod Wilson 2016-07-26 14:25:34 -04:00 committed by Jeff Kirsher
parent 0066c8b6f4
commit 0be5b96cd8
3 changed files with 44 additions and 29 deletions
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6
drivers/net/ethernet/intel/e1000e/82571.c
View File

@ -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,

1
drivers/net/ethernet/intel/e1000e/e1000.h
View File

@ -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]))

66
drivers/net/ethernet/intel/e1000e/netdev.c
View File

@ -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;
if (adapter->flags2 & FLAG2_CHECK_SYSTIM_OVERFLOW)
systim = e1000e_sanitize_systim(hw, systim);
/* 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;
}
}
return systim;
}