From: Yuezhen Luan eggcar.luan@gmail.com
[ Upstream commit 6292d7436cf2f0a2ea8800a1d2cbb155d237818a ]
82580/i354/i350 features circle-counter-like timestamp registers that are different with newer i210. The EXTTS capture value in AUXTSMPx should be converted from raw circle counter value to timestamp value in resolution of 1 nanosec by the driver.
This issue can be reproduced on i350 nics, connecting an 1PPS signal to a SDP pin, and run 'ts2phc' command to read external 1PPS timestamp value. On i210 this works fine, but on i350 the extts is not correctly converted.
The i350/i354/82580's SYSTIM and other timestamp registers are 40bit counters, presenting time range of 2^40 ns, that means these registers overflows every about 1099s. This causes all these regs can't be used directly in contrast to the newer i210/i211s.
The igb driver needs to convert these raw register values to valid time stamp format by using kernel timecounter apis for i350s families. Here the igb_extts() just forgot to do the convert.
Fixes: 38970eac41db ("igb: support EXTTS on 82580/i354/i350") Signed-off-by: Yuezhen Luan eggcar.luan@gmail.com Reviewed-by: Jacob Keller jacob.e.keller@intel.com Tested-by: Pucha Himasekhar Reddy himasekharx.reddy.pucha@intel.com (A Contingent worker at Intel) Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Reviewed-by: Simon Horman simon.horman@corigine.com Link: https://lore.kernel.org/r/20230607164116.3768175-1-anthony.l.nguyen@intel.co... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/igb/igb_main.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 274c781b55473..f2f9f81c123b8 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6948,6 +6948,7 @@ static void igb_extts(struct igb_adapter *adapter, int tsintr_tt) struct e1000_hw *hw = &adapter->hw; struct ptp_clock_event event; struct timespec64 ts; + unsigned long flags;
if (pin < 0 || pin >= IGB_N_SDP) return; @@ -6955,9 +6956,12 @@ static void igb_extts(struct igb_adapter *adapter, int tsintr_tt) if (hw->mac.type == e1000_82580 || hw->mac.type == e1000_i354 || hw->mac.type == e1000_i350) { - s64 ns = rd32(auxstmpl); + u64 ns = rd32(auxstmpl);
- ns += ((s64)(rd32(auxstmph) & 0xFF)) << 32; + ns += ((u64)(rd32(auxstmph) & 0xFF)) << 32; + spin_lock_irqsave(&adapter->tmreg_lock, flags); + ns = timecounter_cyc2time(&adapter->tc, ns); + spin_unlock_irqrestore(&adapter->tmreg_lock, flags); ts = ns_to_timespec64(ns); } else { ts.tv_nsec = rd32(auxstmpl);