net: renesas: rswitch: Improve TX timestamp accuracy

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In the previous code, TX timestamp accuracy was bad because the irq
handler got the timestamp from the timestamp register at that time.

This hardware has "Timestamp capture" feature which can store
each TX timestamp into the timestamp descriptors. To improve
TX timestamp accuracy, implement timestamp descriptors' handling.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Yoshihiro Shimoda 2023-02-09 17:17:41 +09:00 • committed by Jakub Kicinski

parent 48cf0a2570

commit 33f5d733b5

2 changed files with 179 additions and 22 deletions

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166

drivers/net/ethernet/renesas/rswitch.c

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35

drivers/net/ethernet/renesas/rswitch.h

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