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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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For both 1G and 100M operation, it enables pause rate adaptation. > However, our MAC only applies rate adaptation for 1G links. For 100M, it uses a > 10x symbol replication instead. > > We’re exploring a workaround where the MAC is configured to believe it’s > operating at 1G, so it continues using pause rate adaptation, since flow control Why at 1G and not at 2.5G? > is handled by the PHY. Given your deep expertise with Freescale MACs, I’d really > value your opinion on whether this approach makes sense or if you’ve seen > similar configurations before. > > Best regards > Alexander Wilhelm To be crystal clear, are you talking about the T1023 FMan mEMAC as being the one which at 100M uses 10x symbol replication? Because the AQR115 PHY also contains a MAC block inside - this is what provides the MACsec and rate adaptation functionality. And if so, I don't know _how_ can that be - in mainline there is no code that would reconfigure the SerDes lane from 2500base-x to SGMII. These use different baud rates, so the lane would need to be moved to a different PLL which provides the required clock net. Or are you using a different kernel code base where this logic exists? Also, I don't understand _why_ would the FMan mEMAC change its protocol from 2500base-x to SGMII. It certainly doesn't do that by itself. Rate adaptation is handled by phylink (phylink_link_up() sets rx_pause unconditionally to true when in RATE_MATCH_PAUSE mode), and the MAC should be kept in the same configuration for different media-side speeds. Could you print phy_modes(state->interface) in memac_mac_config(), as well as phy_modes(interface), speed, duplex, tx_pause, rx_pause in memac_link_up()? This is to confirm that the mEMAC configuration is identical when the PHY links at 1G and 100M.