On Mon, Mar 18, 2024 at 7:56 AM Thomas Monjalon <tho...@monjalon.net> wrote: > > 12/03/2024 08:52, Dengdui Huang: > > Some speeds can be achieved with different number of lanes. For example, > > 100Gbps can be achieved using two lanes of 50Gbps or four lanes of 25Gbps. > > When use different lanes, the port cannot be up. > > I'm not sure what you are referring to. > I suppose it is not PCI lanes. > Please could you link to an explanation of how a port is split in lanes? > Which hardware does this? > > > This is a snapshot of 100Gb that the latest BCM576xx supports. 100Gb (NRZ: 25G per lane, 4 lanes) link speed 100Gb (PAM4-56: 50G per lane, 2 lanes) link speed 100Gb (PAM4-112: 100G per lane, 1 lane) link speed
Let the user feed in lanes=< integer value> and the NIC driver decides the matching combination speed x lanes that works. In future if a new speed is implemented with more than 8 lanes, there wouldn't be a need to touch this speed command. Using separate lane command would be a better alternative to support already shipped products and only new drivers would consider this lanes configuration, if applicable. -- This electronic communication and the information and any files transmitted with it, or attached to it, are confidential and are intended solely for the use of the individual or entity to whom it is addressed and may contain information that is confidential, legally privileged, protected by privacy laws, or otherwise restricted from disclosure to anyone else. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified that any use, copying, distributing, dissemination, forwarding, printing, or copying of this e-mail is strictly prohibited. If you received this e-mail in error, please return the e-mail to the sender, delete it from your computer, and destroy any printed copy of it.
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