4.19-stable review patch. If anyone has any objections, please let me know.
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From: Daiwei Li daiweili@google.com
[ Upstream commit ba8cf80724dbc09825b52498e4efacb563935408 ]
82580 NICs have a hardware bug that makes it necessary to write into the TSICR (TimeSync Interrupt Cause) register to clear it: https://lore.kernel.org/all/CDCB8BE0.1EC2C%25matthew.vick@intel.com/
Add a conditional so only for 82580 we write into the TSICR register, so we don't risk losing events for other models.
Without this change, when running ptp4l with an Intel 82580 card, I get the following output:
timed out while polling for tx timestamp increasing tx_timestamp_timeout or increasing kworker priority may correct this issue, but a driver bug likely causes it
This goes away with this change.
This (partially) reverts commit ee14cc9ea19b ("igb: Fix missing time sync events").
Fixes: ee14cc9ea19b ("igb: Fix missing time sync events") Closes: https://lore.kernel.org/intel-wired-lan/CAN0jFd1kO0MMtOh8N2Ztxn6f7vvDKp2h507... Tested-by: Daiwei Li daiweili@google.com Suggested-by: Vinicius Costa Gomes vinicius.gomes@intel.com Signed-off-by: Daiwei Li daiweili@google.com Acked-by: Vinicius Costa Gomes vinicius.gomes@intel.com Reviewed-by: Kurt Kanzenbach kurt@linutronix.de 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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/igb/igb_main.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c index 5d8d5915bc27..01138fc93ea1 100644 --- a/drivers/net/ethernet/intel/igb/igb_main.c +++ b/drivers/net/ethernet/intel/igb/igb_main.c @@ -6554,10 +6554,20 @@ static void igb_extts(struct igb_adapter *adapter, int tsintr_tt)
static void igb_tsync_interrupt(struct igb_adapter *adapter) { + const u32 mask = (TSINTR_SYS_WRAP | E1000_TSICR_TXTS | + TSINTR_TT0 | TSINTR_TT1 | + TSINTR_AUTT0 | TSINTR_AUTT1); struct e1000_hw *hw = &adapter->hw; u32 tsicr = rd32(E1000_TSICR); struct ptp_clock_event event;
+ if (hw->mac.type == e1000_82580) { + /* 82580 has a hardware bug that requires an explicit + * write to clear the TimeSync interrupt cause. + */ + wr32(E1000_TSICR, tsicr & mask); + } + if (tsicr & TSINTR_SYS_WRAP) { event.type = PTP_CLOCK_PPS; if (adapter->ptp_caps.pps)