This is a note to let you know that I've just added the patch titled
igc: Do not enable crosstimestamping for i225-V models
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
igc-do-not-enable-crosstimestamping-for-i225-v-model.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 20ec2803317bb1fe0fd98e87d3accdfb82d14a3e
Author: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Date: Mon Dec 13 16:39:49 2021 -0800
igc: Do not enable crosstimestamping for i225-V models
[ 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@xxxxxx/
Reported-by: Stefan Dietrich <roots@xxxxxx>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@xxxxxxxxx>
Tested-by: Nechama Kraus <nechamax.kraus@xxxxxxxxxxxxxxx>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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)
