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From: Thomas Monjalon <thomas@monjalon.net>
To: Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Cc: dev@dpdk.org, Dengdui Huang <huangdengdui@huawei.com>,
	ferruh.yigit@amd.com, aman.deep.singh@intel.com,
	yuying.zhang@intel.com, andrew.rybchenko@oktetlabs.ru,
	liuyonglong@huawei.com, fengchengwen@huawei.com,
	haijie1@huawei.com, lihuisong@huawei.com,
	ajit.khaparde@broadcom.com
Subject: Re: [PATCH 0/3] support setting lanes
Date: Wed, 20 Mar 2024 12:41:13 +0100	[thread overview]
Message-ID: <3384256.usfYGdeWWP@thomas> (raw)
In-Reply-To: <CAKSYD4wWYLMiFYXV=ZcGju44UJ_0C_pWT4_rOteri4-t=Wb24A@mail.gmail.com>

18/03/2024 22:26, Damodharam Ammepalli:
> On Mon, Mar 18, 2024 at 7:56 AM Thomas Monjalon <thomas@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.

Sorry it does not provide enough explanations.
What is a lane? How does it work?
Is it only for Broadcom devices? Do you know other devices?



  parent reply	other threads:[~2024-03-20 11:41 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-12  7:52 Dengdui Huang
2024-03-12  7:52 ` [PATCH 1/3] ethdev: " Dengdui Huang
2024-03-19  3:02   ` Stephen Hemminger
2024-03-20  1:16     ` huangdengdui
2024-03-12  7:52 ` [PATCH 2/3] net/hns3: " Dengdui Huang
2024-03-12  7:52 ` [PATCH 3/3] app/testpmd: " Dengdui Huang
2024-03-15 21:47   ` Damodharam Ammepalli
2024-03-19  2:38     ` huangdengdui
2024-03-22  7:09   ` [PATCH v2 0/6] " Dengdui Huang
2024-03-22  7:09     ` [PATCH v2 1/6] ethdev: " Dengdui Huang
2024-03-22 13:58       ` Thomas Monjalon
2024-03-22 15:15         ` Ajit Khaparde
2024-03-22 17:32           ` Tyler Retzlaff
2024-03-22 22:30             ` Damodharam Ammepalli
2024-03-25  6:24         ` huangdengdui
2024-03-25  9:30           ` Thomas Monjalon
2024-03-25 21:14             ` Damodharam Ammepalli
2024-03-26  1:42             ` lihuisong (C)
2024-03-26  3:45               ` Ajit Khaparde
2024-03-26 10:30               ` Thomas Monjalon
2024-03-26 11:15                 ` lihuisong (C)
2024-03-26 13:47                   ` Ajit Khaparde
2024-03-26 18:11                     ` Ajit Khaparde
2024-03-26 18:21                       ` Damodharam Ammepalli
2024-03-30 11:38                         ` huangdengdui
2024-04-01 20:07                           ` Thomas Monjalon
2024-04-01 22:29                             ` Damodharam Ammepalli
2024-05-22 20:44                               ` Ferruh Yigit
2024-04-02  8:37                             ` huangdengdui
2024-04-02 15:28                               ` Stephen Hemminger
2024-04-04 13:45                               ` Ferruh Yigit
2024-03-29  3:25                     ` lihuisong (C)
2024-03-22  7:09     ` [PATCH v2 2/6] test: updated UT for " Dengdui Huang
2024-03-22  7:09     ` [PATCH v2 3/6] ethdev: add function to parse link mode info Dengdui Huang
2024-03-22  7:09     ` [PATCH v2 4/6] net/hns3: use parse link mode info function Dengdui Huang
2024-03-22  7:09     ` [PATCH v2 5/6] net/hns3: support setting lanes Dengdui Huang
2024-03-22  7:09     ` [PATCH v2 6/6] app/testpmd: " Dengdui Huang
2024-04-04 13:58     ` [PATCH v2 0/6] " Ferruh Yigit
2024-05-16 12:48       ` huangdengdui
2024-05-22 20:49         ` Ferruh Yigit
2024-03-18 14:56 ` [PATCH 0/3] " Thomas Monjalon
2024-03-18 21:26   ` Damodharam Ammepalli
2024-03-18 21:42     ` Stephen Hemminger
2024-03-18 22:55       ` Ajit Khaparde
2024-03-20 11:41     ` Thomas Monjalon [this message]
2024-03-20 12:31     ` Ferruh Yigit
2024-03-21  2:02       ` huangdengdui
2024-03-21  8:28         ` Thomas Monjalon
2024-03-22  2:28           ` huangdengdui
2024-03-22  4:38             ` Jerin Jacob
2024-03-22  5:25               ` Ajit Khaparde
2024-03-22  5:51                 ` Jerin Jacob
2024-03-22 13:51                   ` Thomas Monjalon
2024-03-25 14:04                     ` Jerin Jacob

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