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Mon, 25 Mar 2024 14:14:45 -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> In-Reply-To: <3325989.AxlXzFCzgd@thomas> From: Damodharam Ammepalli Date: Mon, 25 Mar 2024 14:14:32 -0700 Message-ID: Subject: Re: [PATCH v2 1/6] ethdev: support setting lanes To: Thomas Monjalon Cc: huangdengdui , 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, lihuisong@huawei.com Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000babe2a061482a910" 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 --000000000000babe2a061482a910 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Mar 25, 2024 at 2:30=E2=80=AFAM Thomas Monjalon wrote: > > 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 > > 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 throug= h 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 version= . > > When the driver does not support the lanes setting, the code does not n= eed 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 han= dle > in some get/set style functions. > > > Agree with Thomas. 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