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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Aquantia PHY in OCSGMII mode? 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The point is that the MAC does not set > > SGMII for 100M. It still uses 2500base-x but with 10x paket repetition. > > No one uses symbol repetition when in 2500base-x mode. Nothing supports > it. Every device datasheet I've read states clearly that symbol > repetition is unsupported when operating at 2.5Gbps. > > Also think about what this means. If the link is operating at 2.5Gbps > with a 10x symbol repetition, that means the link would be passing > 250Mbps. That's not compatible with _anything_. FWIW, claim 5 of this active Cisco patent suggests dividing frames into 2 segments, replicating symbols from the first segment twice and symbols from the second segment three times. https://patents.google.com/patent/US7356047B1/en I'm completely unaware of any implementations of this either, though. To remain on topic, I don't see how the hardware engineer's claim can be true. The PCS symbol replication is done through the IF_MODE_SPEED field, which lynx_pcs_link_up_2500basex() sets to SGMII_SPEED_2500 (same as SGMII_SPEED_1000, i.e. no replication). You can confirm that the IF_MODE register has the expected value by putting a print.