net: phy: Introduce QUSGMII PHY mode

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The QUSGMII mode is a derivative of Cisco's USXGMII standard. This
standard is pretty similar to SGMII, but allows for faster speeds, and
has the build-in bits for Quad and Octa variants (like QSGMII).

The main difference with SGMII/QSGMII is that USXGMII/QUSGMII re-uses
the preamble to carry various information, named 'Extensions'.

As of today, the USXGMII standard only mentions the "PCH" extension,
which is used to convey timestamps, allowing in-band signaling of PTP
timestamps without having to modify the frame itself.

This commit adds support for that mode. When no extension is in use, it
behaves exactly like QSGMII, although it's not compatible with QSGMII.

Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Maxime Chevallier 2022-08-17 14:32:52 +02:00 • committed by David S. Miller

parent d04807b806

commit 5e61fe157a

3 changed files with 16 additions and 0 deletions

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9

Documentation/networking/phy.rst

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3

drivers/net/phy/phylink.c

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4

include/linux/phy.h

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