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net: sparx5: Fix invalid timestamps

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[ Upstream commit 151ac45348 ]

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: 70dfe25cd8 ("net: sparx5: Update extraction/injection for timestamping")
Signed-off-by: Aakash Menon <aakash.menon@protempis.com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Aakash Menon 2024-09-16 22:18:29 -07:00 committed by Greg Kroah-Hartman
parent d6c4c08670
commit 70db858273
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/microchip/sparx5/sparx5_packet.c
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@ -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);