From: Vinicius Costa Gomes vinicius.gomes@intel.com
[ Upstream commit 1e81dcc1ab7de7a789e60042ce82d5a612632599 ]
It was reported that when PCIe PTM is enabled, some lockups could be observed with some integrated i225-V models.
While the issue is investigated, we can disable crosstimestamp for those models and see no loss of functionality, because those models don't have any support for time synchronization.
Fixes: a90ec8483732 ("igc: Add support for PTP getcrosststamp()") Link: https://lore.kernel.org/all/924175a188159f4e03bd69908a91e606b574139b.camel@g... Reported-by: Stefan Dietrich roots@gmx.de Signed-off-by: Vinicius Costa Gomes vinicius.gomes@intel.com Tested-by: Nechama Kraus nechamax.kraus@linux.intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/intel/igc/igc_ptp.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_ptp.c b/drivers/net/ethernet/intel/igc/igc_ptp.c index 30568e3544cda..4f9245aa79a18 100644 --- a/drivers/net/ethernet/intel/igc/igc_ptp.c +++ b/drivers/net/ethernet/intel/igc/igc_ptp.c @@ -768,7 +768,20 @@ int igc_ptp_get_ts_config(struct net_device *netdev, struct ifreq *ifr) */ static bool igc_is_crosststamp_supported(struct igc_adapter *adapter) { - return IS_ENABLED(CONFIG_X86_TSC) ? pcie_ptm_enabled(adapter->pdev) : false; + if (!IS_ENABLED(CONFIG_X86_TSC)) + return false; + + /* FIXME: it was noticed that enabling support for PCIe PTM in + * some i225-V models could cause lockups when bringing the + * interface up/down. There should be no downsides to + * disabling crosstimestamping support for i225-V, as it + * doesn't have any PTP support. That way we gain some time + * while root causing the issue. + */ + if (adapter->pdev->device == IGC_DEV_ID_I225_V) + return false; + + return pcie_ptm_enabled(adapter->pdev); }
static struct system_counterval_t igc_device_tstamp_to_system(u64 tstamp)