On Mon, Feb 26, 2024 at 10:16:46PM +0800, Shengyu Qu wrote: > Hi Russell, > > > On Mon, Feb 26, 2024 at 09:23:46PM +0800, Shengyu Qu wrote: > > > ODI DFP-34X-2C2 is capable of 2500base-X, but incorrectly report its > > > capabilities in the EEPROM. > > > So use sfp_quirk_2500basex for this module to allow 2500Base-X mode. > > This was previously submitted by Sergio Palumbo, and comes in two > > different forms - an OEM version and non-OEM. There was extensive > > discussion about this, and the result is that I'm not accepting this > > quirk for this module. > > > > The reason is that the module _defaults_ to 1000base-X and requires > > manual reconfiguration by the user to operate at 2500base-X. > > Unfortunately, there is no way for the kernel to know whether that > > reconfiguration has occurred. > No, In the firmware of this stick, the speed rate is configured to auto > negotiation rather than fixed 1000base-X. How does this "auto negotiation" work? I mean *exactly* how does it work? How does it know whether the host is operating at 1000base-X or 2500base-X? There is *no* inband protocol to allow this to be negotiated. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!
