From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 7FA7543CE8; Mon, 18 Mar 2024 23:56:16 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 236364067C; Mon, 18 Mar 2024 23:56:16 +0100 (CET) Received: from mail-pg1-f178.google.com (mail-pg1-f178.google.com [209.85.215.178]) by mails.dpdk.org (Postfix) with ESMTP id 1F85B40299 for ; Mon, 18 Mar 2024 23:56:14 +0100 (CET) Received: by mail-pg1-f178.google.com with SMTP id 41be03b00d2f7-53fa455cd94so3715054a12.2 for ; Mon, 18 Mar 2024 15:56:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; t=1710802573; x=1711407373; darn=dpdk.org; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=3wsYjAAi1vTzo5ySkZdu2RzKr0nzVPTEXCnAICz5E8Q=; b=EU05tprVKCLUF/vZbSsg5SRsSAIEfh9J1lB1ssj2RBnvRMMnDQrUJw/DpFJrg/3lIM Oo0SDzyVe8mt7SJgQMWKwOAaEtLtmQhtVrTsrn3EsE9+AdP7/WPIKwVrk/Yovm6pwE5i 2dWQli5CatWSGi0new3+6wt3AAAMx+BbLim0I= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710802573; x=1711407373; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=3wsYjAAi1vTzo5ySkZdu2RzKr0nzVPTEXCnAICz5E8Q=; b=GUm+N6w2ROpnHMZVM2Da2Z0uiBBTsCIf2xACmFZ+6ZyNfyjEOrgAn5QeYlIfIec8S4 RVU5iwNAKueDAMfnCrUL4k46L0XwT8nvFE1Sl1q4qpc0dQvWiThpPCIb3nQe6E/gBbrt jaW96Bi6ZB7rvO1CpneOU3Cju6rvqjlxi+2BPCCrurcz2ML/sCLFgk0W1NbmTDEWGSWr bCZ8KqxqqO9yGa51nrW9TyNGVF1noFNAntRb2OxUSvhRGIRRa2vQQcHsrGQb1N2Z/bbp 3RWi4xpC0sawvRevyT6wSepqp6eNr7IVNWhn6AoS/7ZAz9FaDPi8xSmdNbopCNTZJT+4 CGKg== X-Forwarded-Encrypted: i=1; AJvYcCUEMURQfzPj7vcmj3GNN5g7Z/pOOjh9CkT4wS5Pibausi38gonxeY+/XSeYdywzs4gGksXfleY3H0GRXfM= X-Gm-Message-State: AOJu0YwnTfQlGI8qhvZIQLkIYGsc/zhCM/CuJIkzUiCEPyfYY07xMx8E ec9Dfm70EoquqRd7BTqcig+GhT+B87vhqxmzpEN1pJkvXgPWRnpfu+wD8dOoPxpXNJDUTMwND2j S/UcfaYUBDmVI/cB7681fPW1kYjOetN89iafZ X-Google-Smtp-Source: AGHT+IE2O6cXkir7KReIJlgaUy5ky5mb4gAUEISa4qWK0EkofBDN2N+ODgr9P4IEO3y8Oi3cRBr2gAzeuqYl5o9Hm3Y= X-Received: by 2002:a17:90a:f28c:b0:29b:b478:b8fd with SMTP id fs12-20020a17090af28c00b0029bb478b8fdmr959030pjb.35.1710802573154; Mon, 18 Mar 2024 15:56:13 -0700 (PDT) MIME-Version: 1.0 References: <20240312075238.3319480-1-huangdengdui@huawei.com> <1759403.vCJZsxu672@thomas> <20240318144210.2b14bd5b@hermes.local> In-Reply-To: <20240318144210.2b14bd5b@hermes.local> From: Ajit Khaparde Date: Mon, 18 Mar 2024 15:55:54 -0700 Message-ID: Subject: Re: [PATCH 0/3] support setting lanes To: Stephen Hemminger Cc: Damodharam Ammepalli , Thomas Monjalon , Dengdui Huang , dev@dpdk.org, 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 Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000ad01c00613f743a9" 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 --000000000000ad01c00613f743a9 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Mar 18, 2024 at 2:42=E2=80=AFPM Stephen Hemminger wrote: > > On Mon, 18 Mar 2024 14:26:33 -0700 > Damodharam Ammepalli wrote: > > > On Mon, Mar 18, 2024 at 7:56=E2=80=AFAM Thomas Monjalon wrote: > > > > > > 12/03/2024 08:52, Dengdui Huang: > > > > Some speeds can be achieved with different number of lanes. For exa= mple, > > > > 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 lan= es? > > > 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=3D< integer value> and the NIC driver decide= s > > the matching combination speed x lanes that works. In future if a new s= peed > > 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 ne= w > > drivers would consider this lanes configuration, if applicable. > > > > The DPDK does not need more driver specific knobs. > Shouldn't the PMD be able to auto negotiate the speed? Yes. Its possible to auto negotiate. And that's the default. Even for the lane count, a default number can be arrived at. > What does Linux do? ethtool has been extended a while ago to allow configuring the number of lanes along with speed and other settings. But as usual, autoneg is possible. --000000000000ad01c00613f743a9 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 AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA vbCmXCcsbZ/a0fRIQMBxp4gJnnyeneFYpEtNydrZZ+GeKSMdHiDgXD1UnRSIudKo+moQ6YlCOu4t rVWO/EiXfYnK7zeop26ry1RpKtogB7/O115zultAz64ydQYLe+a1e/czkALg3sgTcOOcFZTXk38e aqsXsipoX1vsNurqPtnC27TWsA7pk4uKXscFjkeUE8JZu9BDKaswZygxBOPBQBwrA5+20Wxlk6k1 e6EKaaNaNZUy30q3ArEf30ZDpXyfCtiXnupjSK8WU2cK4qsEtj09JS4+mhi0CTCrCnXAzum3tgcH cHRg0prcSzzEUDQWoFxyuqwiwhHu3sPQNmFOMwIDAQABo4IB2jCCAdYwDgYDVR0PAQH/BAQDAgGG MGAGA1UdJQRZMFcGCCsGAQUFBwMCBggrBgEFBQcDBAYKKwYBBAGCNxQCAgYKKwYBBAGCNwoDBAYJ KwYBBAGCNxUGBgorBgEEAYI3CgMMBggrBgEFBQcDBwYIKwYBBQUHAxEwEgYDVR0TAQH/BAgwBgEB /wIBADAdBgNVHQ4EFgQUljPR5lgXWzR1ioFWZNW+SN6hj88wHwYDVR0jBBgwFoAUj/BLf6guRSSu TVD6Y5qL3uLdG7wwegYIKwYBBQUHAQEEbjBsMC0GCCsGAQUFBzABhiFodHRwOi8vb2NzcC5nbG9i YWxzaWduLmNvbS9yb290cjMwOwYIKwYBBQUHMAKGL2h0dHA6Ly9zZWN1cmUuZ2xvYmFsc2lnbi5j b20vY2FjZXJ0L3Jvb3QtcjMuY3J0MDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwuZ2xvYmFs c2lnbi5jb20vcm9vdC1yMy5jcmwwWgYDVR0gBFMwUTALBgkrBgEEAaAyASgwQgYKKwYBBAGgMgEo CjA0MDIGCCsGAQUFBwIBFiZodHRwczovL3d3dy5nbG9iYWxzaWduLmNvbS9yZXBvc2l0b3J5LzAN BgkqhkiG9w0BAQsFAAOCAQEAdAXk/XCnDeAOd9nNEUvWPxblOQ/5o/q6OIeTYvoEvUUi2qHUOtbf jBGdTptFsXXe4RgjVF9b6DuizgYfy+cILmvi5hfk3Iq8MAZsgtW+A/otQsJvK2wRatLE61RbzkX8 9/OXEZ1zT7t/q2RiJqzpvV8NChxIj+P7WTtepPm9AIj0Keue+gS2qvzAZAY34ZZeRHgA7g5O4TPJ /oTd+4rgiU++wLDlcZYd/slFkaT3xg4qWDepEMjT4T1qFOQIL+ijUArYS4owpPg9NISTKa1qqKWJ jFoyms0d0GwOniIIbBvhI2MJ7BSY9MYtWVT5jJO3tsVHwj4cp92CSFuGwunFMzCCA18wggJHoAMC AQICCwQAAAAAASFYUwiiMA0GCSqGSIb3DQEBCwUAMEwxIDAeBgNVBAsTF0dsb2JhbFNpZ24gUm9v dCBDQSAtIFIzMRMwEQYDVQQKEwpHbG9iYWxTaWduMRMwEQYDVQQDEwpHbG9iYWxTaWduMB4XDTA5 MDMxODEwMDAwMFoXDTI5MDMxODEwMDAwMFowTDEgMB4GA1UECxMXR2xvYmFsU2lnbiBSb290IENB IC0gUjMxEzARBgNVBAoTCkdsb2JhbFNpZ24xEzARBgNVBAMTCkdsb2JhbFNpZ24wggEiMA0GCSqG SIb3DQEBAQUAA4IBDwAwggEKAoIBAQDMJXaQeQZ4Ihb1wIO2hMoonv0FdhHFrYhy/EYCQ8eyip0E XyTLLkvhYIJG4VKrDIFHcGzdZNHr9SyjD4I9DCuul9e2FIYQebs7E4B3jAjhSdJqYi8fXvqWaN+J J5U4nwbXPsnLJlkNc96wyOkmDoMVxu9bi9IEYMpJpij2aTv2y8gokeWdimFXN6x0FNx04Druci8u nPvQu7/1PQDhBjPogiuuU6Y6FnOM3UEOIDrAtKeh6bJPkC4yYOlXy7kEkmho5TgmYHWyn3f/kRTv riBJ/K1AFUjRAjFhGV64l++td7dkmnq/X8ET75ti+w1s4FRpFqkD2m7pg5NxdsZphYIXAgMBAAGj QjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMBAf8EBTADAQH/MB0GA1UdDgQWBBSP8Et/qC5FJK5N UPpjmove4t0bvDANBgkqhkiG9w0BAQsFAAOCAQEAS0DbwFCq/sgM7/eWVEVJu5YACUGssxOGhigH M8pr5nS5ugAtrqQK0/Xx8Q+Kv3NnSoPHRHt44K9ubG8DKY4zOUXDjuS5V2yq/BKW7FPGLeQkbLmU Y/vcU2hnVj6DuM81IcPJaP7O2sJTqsyQiunwXUaMld16WCgaLx3ezQA3QY/tRG3XUyiXfvNnBB4V 14qWtNPeTCekTBtzc3b0F5nCH3oO4y0IrQocLP88q1UOD5F+NuvDV0m+4S4tfGCLw0FREyOdzvcy a5QBqJnnLDMfOjsl0oZAzjsshnjJYS8Uuu7bVW/fhO4FCU29KNhyztNiUGUe65KXgzHZs7XKR1g/ XzCCBVUwggQ9oAMCAQICDAzZWuPidkrRZaiw2zANBgkqhkiG9w0BAQsFADBbMQswCQYDVQQGEwJC RTEZMBcGA1UEChMQR2xvYmFsU2lnbiBudi1zYTExMC8GA1UEAxMoR2xvYmFsU2lnbiBHQ0MgUjMg UGVyc29uYWxTaWduIDIgQ0EgMjAyMDAeFw0yMjA5MTAwODE4NDVaFw0yNTA5MTAwODE4NDVaMIGW MQswCQYDVQQGEwJJTjESMBAGA1UECBMJS2FybmF0YWthMRIwEAYDVQQHEwlCYW5nYWxvcmUxFjAU BgNVBAoTDUJyb2FkY29tIEluYy4xHDAaBgNVBAMTE0FqaXQgS3VtYXIgS2hhcGFyZGUxKTAnBgkq hkiG9w0BCQEWGmFqaXQua2hhcGFyZGVAYnJvYWRjb20uY29tMIIBIjANBgkqhkiG9w0BAQEFAAOC AQ8AMIIBCgKCAQEArZ/Aqg34lMOo2BabvAa+dRThl9OeUUJMob125dz+jvS78k4NZn1mYrHu53Dn YycqjtuSMlJ6vJuwN2W6QpgTaA2SDt5xTB7CwA2urpcm7vWxxLOszkr5cxMB1QBbTd77bXFuyTqW jrer3VIWqOujJ1n+n+1SigMwEr7PKQR64YKq2aRYn74ukY3DlQdKUrm2yUkcA7aExLcAwHWUna/u pZEyqKnwS1lKCzjX7mV5W955rFsFxChdAKfw0HilwtqdY24mhy62+GeaEkD0gYIj1tCmw9gnQToc K+0s7xEunfR9pBrzmOwS3OQbcP0nJ8SmQ8R+reroH6LYuFpaqK1rgQIDAQABo4IB2zCCAdcwDgYD VR0PAQH/BAQDAgWgMIGjBggrBgEFBQcBAQSBljCBkzBOBggrBgEFBQcwAoZCaHR0cDovL3NlY3Vy ZS5nbG9iYWxzaWduLmNvbS9jYWNlcnQvZ3NnY2NyM3BlcnNvbmFsc2lnbjJjYTIwMjAuY3J0MEEG CCsGAQUFBzABhjVodHRwOi8vb2NzcC5nbG9iYWxzaWduLmNvbS9nc2djY3IzcGVyc29uYWxzaWdu MmNhMjAyMDBNBgNVHSAERjBEMEIGCisGAQQBoDIBKAowNDAyBggrBgEFBQcCARYmaHR0cHM6Ly93 d3cuZ2xvYmFsc2lnbi5jb20vcmVwb3NpdG9yeS8wCQYDVR0TBAIwADBJBgNVHR8EQjBAMD6gPKA6 hjhodHRwOi8vY3JsLmdsb2JhbHNpZ24uY29tL2dzZ2NjcjNwZXJzb25hbHNpZ24yY2EyMDIwLmNy bDAlBgNVHREEHjAcgRphaml0LmtoYXBhcmRlQGJyb2FkY29tLmNvbTATBgNVHSUEDDAKBggrBgEF BQcDBDAfBgNVHSMEGDAWgBSWM9HmWBdbNHWKgVZk1b5I3qGPzzAdBgNVHQ4EFgQUbrcTuh0mr2qP xYdtyDgFeRIiE/gwDQYJKoZIhvcNAQELBQADggEBALrc1TljKrDhXicOaZlzIQyqOEkKAZ324i8X OwzA0n2EcPGmMZvgARurvanSLD3mLeeuyq1feCcjfGM1CJFh4+EY7EkbFbpVPOIdstSBhbnAJnOl aC/q0wTndKoC/xXBhXOZB8YL/Zq4ZclQLMUO6xi/fFRyHviI5/IrosdrpniXFJ9ukJoOXtvdrEF+ KlMYg/Deg9xo3wddCqQIsztHSkR4XaANdn+dbLRQpctZ13BY1lim4uz5bYn3M0IxyZWkQ1JuPHCK aRJv0SfR88PoI4RB7NCEHqFwARTj1KvFPQi8pK/YISFydZYbZrxQdyWDidqm4wSuJfpE6i0cWvCd u50xggJtMIICaQIBATBrMFsxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNh MTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBSMyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwAgwM2Vrj 4nZK0WWosNswDQYJYIZIAWUDBAIBBQCggdQwLwYJKoZIhvcNAQkEMSIEIAd/59gYoYBozhtNgBSU enjWn8r3JcGghBKVtJ0yeOrDMBgGCSqGSIb3DQEJAzELBgkqhkiG9w0BBwEwHAYJKoZIhvcNAQkF MQ8XDTI0MDMxODIyNTYxM1owaQYJKoZIhvcNAQkPMVwwWjALBglghkgBZQMEASowCwYJYIZIAWUD BAEWMAsGCWCGSAFlAwQBAjAKBggqhkiG9w0DBzALBgkqhkiG9w0BAQowCwYJKoZIhvcNAQEHMAsG CWCGSAFlAwQCATANBgkqhkiG9w0BAQEFAASCAQBRyYBGS8PFUcsPa+Pr7cdM1t6oQSCCwHQD+Ej9 E12Ytin/noMRekmh1togbve21QlUhpyS6h8UUbUXn+Xv3AoUA4kUIiFaNs54CxcsCimmtgHAVIwx WGD/fkx5ugzcveSLZQM7o3ajYu/jk65GSrQ0M9r0Xh7TEoVOuJTBBezEvKApLbX8wglXHrCuGPV7 lIOs+3s6cLRqUQbxXjzin5BYiiQkNHIEH2g4sQeosdI81Nk+c1tk+aanjjzJArWEluaDCMrlE5xk A/DoT4e6AK7NcysMYiaN6p3/fFAdyi+zVJkdsh3TCnfaAdt3Mxrm2FoVPm/Rw94jx2ZqRtq6GolM --000000000000ad01c00613f743a9--