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Mon, 25 Mar 2024 20:45:48 -0700 (PDT) MIME-Version: 1.0 References: <20240312075238.3319480-4-huangdengdui@huawei.com> <4413054.MSiuQNM8U4@thomas> <90a508af-7b6d-4026-b4e9-ec35c0df9b97@huawei.com> <3325989.AxlXzFCzgd@thomas> <68ee0a54-c0b4-293c-67ee-efed8964c33b@huawei.com> In-Reply-To: <68ee0a54-c0b4-293c-67ee-efed8964c33b@huawei.com> From: Ajit Khaparde Date: Mon, 25 Mar 2024 20:45:31 -0700 Message-ID: Subject: Re: [PATCH v2 1/6] ethdev: support setting lanes To: "lihuisong (C)" Cc: Thomas Monjalon , huangdengdui , Damodharam Ammepalli , 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 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000038c76d0614882093" X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org --00000000000038c76d0614882093 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Mar 25, 2024 at 6:42=E2=80=AFPM lihuisong (C) wrote: > > > =E5=9C=A8 2024/3/25 17:30, Thomas Monjalon =E5=86=99=E9=81=93: > > 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 Gbp= s */ > >>>> +#define RTE_ETH_LINK_SPEED_20G RTE_BIT32(9) /**< 20 Gbp= s 2lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_25G RTE_BIT32(10) /**< 25 Gbp= s */ > >>>> +#define RTE_ETH_LINK_SPEED_40G RTE_BIT32(11) /**< 40 Gbp= s 4lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_50G RTE_BIT32(12) /**< 50 Gbp= s */ > >>>> +#define RTE_ETH_LINK_SPEED_56G RTE_BIT32(13) /**< 56 Gbp= s 4lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_100G RTE_BIT32(14) /**< 100 Gb= ps */ > >>>> +#define RTE_ETH_LINK_SPEED_200G RTE_BIT32(15) /**< 200 Gb= ps 4lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_400G RTE_BIT32(16) /**< 400 Gb= ps 4lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_10G_4LANES RTE_BIT32(17) /**< 10 Gb= ps 4lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_50G_2LANES RTE_BIT32(18) /**< 50 Gbp= s 2 lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_100G_2LANES RTE_BIT32(19) /**< 100 Gb= ps 2 lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_100G_4LANES RTE_BIT32(20) /**< 100 Gb= ps 4lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_200G_2LANES RTE_BIT32(21) /**< 200 Gb= ps 2lanes */ > >>>> +#define RTE_ETH_LINK_SPEED_400G_8LANES RTE_BIT32(22) /**< 400 Gb= ps 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 l= anes 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 So if DPDK provides a get lanes API, it should be able to tell the number of lanes supported. After that, the user should be able to pick one of the supported lane count= s? > >> 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 lane= s. > >> > >> 2. For the PHY, When the physical layer capability is configured throu= gh the MDIO, > >> the speed and lanes are also coupled. > >> For example: > >> Table 45=E2=80=937=E2=80=94PMA/PMD control 2 register bit definitions[= 1] > >> PMA/PMD type selection > >> 1 0 0 1 0 1 0 =3D 100GBASE-SR2 PMA/PMD > >> 0 1 0 1 1 1 1 =3D 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 versio= n. > >> 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 h= andle > > 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. > > 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 point= s: > 1) user don't know what lanes should or can be set for a specified speed > on one NIC. > 2) how should PMD do for a supported lanes in their HW? > > 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. > > [1] https://patchwork.dpdk.org/project/dpdk/list/?series=3D31606 > > BR, > /Huisong > > > > > > > > . --00000000000038c76d0614882093 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQdgYJKoZIhvcNAQcCoIIQZzCCEGMCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3NMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE 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