[Intel-wired-lan] [PATCH iwl-net v1] igb: Fix not clearing TimeSync interrupts for 82580
Paul Menzel
pmenzel at molgen.mpg.de
Sat Aug 10 04:21:17 UTC 2024
Dear Vinicius,
Thank you for the patch.
Am 10.08.24 um 02:23 schrieb Vinicius Costa Gomes:
> It was reported that 82580 NICs have a hardware bug that makes it
> necessary to write into the TSICR (TimeSync Interrupt Cause) register
> to clear it.
Were you able to verify that report by checking against some errata? Is
Intel aware of the problem?
> Add a conditional so only for 82580 we write into the TSICR register,
> so we don't risk losing events for other models.
>
> This (partially) reverts commit ee14cc9ea19b ("igb: Fix missing time sync events").
>
> Fixes: ee14cc9ea19b ("igb: Fix missing time sync events")
> Reported-by: Daiwei Li <daiweili at gmail.com>
> Closes: https://lore.kernel.org/intel-wired-lan/CAN0jFd1kO0MMtOh8N2Ztxn6f7vvDKp2h507sMryobkBKe=xk=w@mail.gmail.com/
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes at intel.com>
> ---
>
> @Daiwei Li, I don't have a 82580 handy, please confirm that the patch
> fixes the issue you are having.
Please also add a description of the test case, and maybe the PCI vendor
and device code of your network device.
> drivers/net/ethernet/intel/igb/igb_main.c | 27 ++++++++++++++++++-----
> 1 file changed, 22 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
> index 11be39f435f3..edb34f67ae03 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -6960,31 +6960,48 @@ static void igb_extts(struct igb_adapter *adapter, int tsintr_tt)
> static void igb_tsync_interrupt(struct igb_adapter *adapter)
> {
> struct e1000_hw *hw = &adapter->hw;
> - u32 tsicr = rd32(E1000_TSICR);
> + u32 ack = 0, tsicr = rd32(E1000_TSICR);
> struct ptp_clock_event event;
>
> if (tsicr & TSINTR_SYS_WRAP) {
> event.type = PTP_CLOCK_PPS;
> if (adapter->ptp_caps.pps)
> ptp_clock_event(adapter->ptp_clock, &event);
> + ack |= TSINTR_SYS_WRAP;
> }
>
> if (tsicr & E1000_TSICR_TXTS) {
> /* retrieve hardware timestamp */
> schedule_work(&adapter->ptp_tx_work);
> + ack |= E1000_TSICR_TXTS;
> }
>
> - if (tsicr & TSINTR_TT0)
> + if (tsicr & TSINTR_TT0) {
> igb_perout(adapter, 0);
> + ack |= TSINTR_TT0;
> + }
>
> - if (tsicr & TSINTR_TT1)
> + if (tsicr & TSINTR_TT1) {
> igb_perout(adapter, 1);
> + ack |= TSINTR_TT1;
> + }
>
> - if (tsicr & TSINTR_AUTT0)
> + if (tsicr & TSINTR_AUTT0) {
> igb_extts(adapter, 0);
> + ack |= TSINTR_AUTT0;
> + }
>
> - if (tsicr & TSINTR_AUTT1)
> + if (tsicr & TSINTR_AUTT1) {
> igb_extts(adapter, 1);
> + ack |= TSINTR_AUTT1;
> + }
> +
> + if (hw->mac.type == e1000_82580) {
> + /* 82580 has a hardware bug that requires a explicit
a*n*
> + * write to clear the TimeSync interrupt cause.
> + */
> + wr32(E1000_TSICR, ack);
> + }
Is there a nicer way to write this, so `ack` is only assigned in case
for the 82580?
> }
>
> static irqreturn_t igb_msix_other(int irq, void *data)
Kind regards,
Paul
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