On Mon, Feb 26, 2024 at 10:16:46PM +0800, Shengyu Qu wrote:Well, that seems some kind weird trick implemented in that chip's SDK (maybe hardware?). It would automatically detect the speed rate that host uses and switch to that rate. The system log of the stick shows that.
Hi Russell,
On Mon, Feb 26, 2024 at 09:23:46PM +0800, Shengyu Qu wrote:No, In the firmware of this stick, the speed rate is configured to auto
ODI DFP-34X-2C2 is capable of 2500base-X, but incorrectly report itsThis was previously submitted by Sergio Palumbo, and comes in two
capabilities in the EEPROM.
So use sfp_quirk_2500basex for this module to allow 2500Base-X mode.
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.
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.
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