[PATCH 0/3] support setting lanes

[Damodharam Ammepalli]

On Mon, Mar 18, 2024 at 7:56 AM Thomas Monjalon <thomas at 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.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 4233 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://mails.dpdk.org/archives/dev/attachments/20240318/bd3a5901/attachment.bin>