net: sparx5: Fix invalid timestamps

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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>

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Aakash Menon 2024-09-16 22:18:29 -07:00 • committed by David S. Miller

parent 9410645520

commit 151ac45348

1 changed files with 5 additions and 1 deletions

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drivers/net/ethernet/microchip/sparx5/sparx5_packet.c

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