This is a note to let you know that I've just added the patch titled
net: sparx5: Fix invalid timestamps
to the 6.6-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:
net-sparx5-fix-invalid-timestamps.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f5dc74221ecf1829d943f6935217aecc6f10707f
Author: Aakash Menon <aakash.r.menon@xxxxxxxxx>
Date: Mon Sep 16 22:18:29 2024 -0700
net: sparx5: Fix invalid timestamps
[ Upstream commit 151ac45348afc5b56baa584c7cd4876addf461ff ]
Bit 270-271 are occasionally unexpectedly set by the hardware. This issue
was observed with 10G SFPs causing huge time errors (> 30ms) in PTP. Only
30 bits are needed for the nanosecond part of the timestamp, clear 2 most
significant bits before extracting timestamp from the internal frame
header.
Fixes: 70dfe25cd866 ("net: sparx5: Update extraction/injection for timestamping")
Signed-off-by: Aakash Menon <aakash.menon@xxxxxxxxxxxxx>
Reviewed-by: Horatiu Vultur <horatiu.vultur@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
index ac7e1cffbcecf..dcf2e342fc14a 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
@@ -45,8 +45,12 @@ void sparx5_ifh_parse(u32 *ifh, struct frame_info *info)
fwd = (fwd >> 5);
info->src_port = FIELD_GET(GENMASK(7, 1), fwd);
+ /*
+ * Bit 270-271 are occasionally unexpectedly set by the hardware,
+ * clear bits before extracting timestamp
+ */
info->timestamp =
- ((u64)xtr_hdr[2] << 24) |
+ ((u64)(xtr_hdr[2] & GENMASK(5, 0)) << 24) |
((u64)xtr_hdr[3] << 16) |
((u64)xtr_hdr[4] << 8) |
((u64)xtr_hdr[5] << 0);
