From: "lihuisong (C)" <lihuisong@huawei.com>
To: Thomas Monjalon <thomas@monjalon.net>,
huangdengdui <huangdengdui@huawei.com>,
Damodharam Ammepalli <damodharam.ammepalli@broadcom.com>
Cc: <ajit.khaparde@broadcom.com>, <roretzla@linux.microsoft.com>,
<dev@dpdk.org>, <ferruh.yigit@amd.com>,
<aman.deep.singh@intel.com>, <yuying.zhang@intel.com>,
<andrew.rybchenko@oktetlabs.ru>, <stephen@networkplumber.org>,
<jerinjacobk@gmail.com>, <liuyonglong@huawei.com>,
<fengchengwen@huawei.com>, <haijie1@huawei.com>
Subject: Re: [PATCH v2 1/6] ethdev: support setting lanes
Date: Tue, 26 Mar 2024 19:15:05 +0800 [thread overview]
Message-ID: <baa88ae9-ee13-8a9b-839b-d4e50c52b1f8@huawei.com> (raw)
In-Reply-To: <3628913.0YcMNavOfZ@thomas>
在 2024/3/26 18:30, Thomas Monjalon 写道:
> 26/03/2024 02:42, lihuisong (C):
>> 在 2024/3/25 17:30, Thomas Monjalon 写道:
>>> 25/03/2024 07:24, huangdengdui:
>>>> On 2024/3/22 21:58, Thomas Monjalon wrote:
>>>>> 22/03/2024 08:09, Dengdui Huang:
>>>>>> -#define RTE_ETH_LINK_SPEED_10G RTE_BIT32(8) /**< 10 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_20G RTE_BIT32(9) /**< 20 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_25G RTE_BIT32(10) /**< 25 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_40G RTE_BIT32(11) /**< 40 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_50G RTE_BIT32(12) /**< 50 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_56G RTE_BIT32(13) /**< 56 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_100G RTE_BIT32(14) /**< 100 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_200G RTE_BIT32(15) /**< 200 Gbps */
>>>>>> -#define RTE_ETH_LINK_SPEED_400G RTE_BIT32(16) /**< 400 Gbps */
>>>>>> +#define RTE_ETH_LINK_SPEED_10G RTE_BIT32(8) /**< 10 Gbps */
>>>>>> +#define RTE_ETH_LINK_SPEED_20G RTE_BIT32(9) /**< 20 Gbps 2lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_25G RTE_BIT32(10) /**< 25 Gbps */
>>>>>> +#define RTE_ETH_LINK_SPEED_40G RTE_BIT32(11) /**< 40 Gbps 4lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_50G RTE_BIT32(12) /**< 50 Gbps */
>>>>>> +#define RTE_ETH_LINK_SPEED_56G RTE_BIT32(13) /**< 56 Gbps 4lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_100G RTE_BIT32(14) /**< 100 Gbps */
>>>>>> +#define RTE_ETH_LINK_SPEED_200G RTE_BIT32(15) /**< 200 Gbps 4lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_400G RTE_BIT32(16) /**< 400 Gbps 4lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_10G_4LANES RTE_BIT32(17) /**< 10 Gbps 4lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_50G_2LANES RTE_BIT32(18) /**< 50 Gbps 2 lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_100G_2LANES RTE_BIT32(19) /**< 100 Gbps 2 lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_100G_4LANES RTE_BIT32(20) /**< 100 Gbps 4lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_200G_2LANES RTE_BIT32(21) /**< 200 Gbps 2lanes */
>>>>>> +#define RTE_ETH_LINK_SPEED_400G_8LANES RTE_BIT32(22) /**< 400 Gbps 8lanes */
>>>>> I don't think it is a good idea to make this more complex.
>>>>> It brings nothing as far as I can see, compared to having speed and lanes separated.
>>>>> Can we have lanes information a separate value? no need for bitmask.
>>>>>
>>>> Hi,Thomas, Ajit, roretzla, damodharam
>>>>
>>>> I also considered the option at the beginning of the design.
>>>> But this option is not used due to the following reasons:
>>>> 1. For the user, ethtool couples speed and lanes.
>>>> The result of querying the NIC capability is as follows:
>>>> Supported link modes:
>>>> 100000baseSR4/Full
>>>> 100000baseSR2/Full
>>>> The NIC capability is configured as follows:
>>>> ethtool -s eth1 speed 100000 lanes 4 autoneg off
>>>> ethtool -s eth1 speed 100000 lanes 2 autoneg off
>>>>
>>>> Therefore, users are more accustomed to the coupling of speed and lanes.
>>>>
>>>> 2. For the PHY, When the physical layer capability is configured through the MDIO,
>>>> the speed and lanes are also coupled.
>>>> For example:
>>>> Table 45–7—PMA/PMD control 2 register bit definitions[1]
>>>> PMA/PMD type selection
>>>> 1 0 0 1 0 1 0 = 100GBASE-SR2 PMA/PMD
>>>> 0 1 0 1 1 1 1 = 100GBASE-SR4 PMA/PMD
>>>>
>>>> Therefore, coupling speeds and lanes is easier to understand.
>>>> And it is easier for the driver to report the support lanes.
>>>>
>>>> In addition, the code implementation is compatible with the old version.
>>>> When the driver does not support the lanes setting, the code does not need to be modified.
>>>>
>>>> So I think the speed and lanes coupling is better.
>>> I don't think so.
>>> You are mixing hardware implementation, user tool, and API.
>>> Having a separate and simple API is cleaner and not more difficult to handle
>>> in some get/set style functions.
>> Having a separate and simple API is cleaner. It's good.
>> But supported lane capabilities have a lot to do with the specified
>> speed. This is determined by releated specification.
>> If we add a separate API for speed lanes, it probably is hard to check
>> the validity of the configuration for speed and lanes.
>> And the setting lane API sepparated from speed is not good for
>> uniforming all PMD's behavior in ethdev layer.
> Please let's be more specific.
> There are 3 needs:
> - set PHY lane config
> - get PHY lane config
> - get PHY lane capabilities
IMO, this lane capabilities should be reported based on supported speed
capabilities.
>
> There is no problem providing a function to get the number of PHY lanes.
> It is possible to set PHY lanes number after defining a fixed speed.
yes it's ok.
>
>> The patch[1] is an example for this separate API.
>> I think it is not very good. It cannot tell user and PMD the follow points:
>> 1) user don't know what lanes should or can be set for a specified speed
>> on one NIC.
> This is about capabilities.
> Can we say a HW will support a maximum number of PHY lanes in general?
> We may need to associate the maximum speed per lane?
> Do we really need to associate PHY lane and PHY speed numbers for capabilities?
Personally, it should contain the below releationship at least.
speed 10G --> 1lane | 4lane
speed 100G --> 2lane | 4lane
> Example: if a HW supports 100G-4-lanes and 200G-2-lanes,
> may we assume it is also supporting 200G-4-lanes?
I think we cannot assume that NIC also support 200G-4-lanes.
Beause it has a lot to do with HW design.
>
>> 2) how should PMD do for a supported lanes in their HW?
> I don't understand this question. Please rephrase.
I mean that PMD don't know set how many lanes when the lanes from user
is not supported on a fixed speed by PMD.
So ethdev layer should limit the avaiable lane number based on a fixed
speed.
>
>> Anyway, if we add setting speed lanes feature, we must report and set
>> speed and lanes capabilities for user well.
>> otherwise, user will be more confused.
> Well is not necessarily exposing all raw combinations as ethtool does.
Agreed.
>
>> [1] https://patchwork.dpdk.org/project/dpdk/list/?series=31606
>
>
> .
next prev parent reply other threads:[~2024-03-26 11:15 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-12 7:52 [PATCH 0/3] " 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) [this message]
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
2024-04-02 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
2024-03-18 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
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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