linux-kernel - Re: [RFC PATCH v8 08/10] ice: implement dpll interface to control cgu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 21 Jun 2023 14:29:59 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
Cc:     "kuba@...nel.org" <kuba@...nel.org>,
        "vadfed@...a.com" <vadfed@...a.com>,
        "jonathan.lemon@...il.com" <jonathan.lemon@...il.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "corbet@....net" <corbet@....net>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "vadfed@...com" <vadfed@...com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "M, Saeed" <saeedm@...dia.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        "sj@...nel.org" <sj@...nel.org>,
        "javierm@...hat.com" <javierm@...hat.com>,
        "ricardo.canuelo@...labora.com" <ricardo.canuelo@...labora.com>,
        "mst@...hat.com" <mst@...hat.com>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "Michalik, Michal" <michal.michalik@...el.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jacek.lawrynowicz@...ux.intel.com" 
        <jacek.lawrynowicz@...ux.intel.com>,
        "airlied@...hat.com" <airlied@...hat.com>,
        "ogabbay@...nel.org" <ogabbay@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "nipun.gupta@....com" <nipun.gupta@....com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "linux@...y.sk" <linux@...y.sk>,
        "masahiroy@...nel.org" <masahiroy@...nel.org>,
        "benjamin.tissoires@...hat.com" <benjamin.tissoires@...hat.com>,
        "geert+renesas@...der.be" <geert+renesas@...der.be>,
        "Olech, Milena" <milena.olech@...el.com>,
        "kuniyu@...zon.com" <kuniyu@...zon.com>,
        "liuhangbin@...il.com" <liuhangbin@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "andy.ren@...cruise.com" <andy.ren@...cruise.com>,
        "razor@...ckwall.org" <razor@...ckwall.org>,
        "idosch@...dia.com" <idosch@...dia.com>,
        "lucien.xin@...il.com" <lucien.xin@...il.com>,
        "nicolas.dichtel@...nd.com" <nicolas.dichtel@...nd.com>,
        "phil@....cc" <phil@....cc>,
        "claudiajkang@...il.com" <claudiajkang@...il.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, poros <poros@...hat.com>,
        mschmidt <mschmidt@...hat.com>,
        "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "vadim.fedorenko@...ux.dev" <vadim.fedorenko@...ux.dev>
Subject: Re: [RFC PATCH v8 08/10] ice: implement dpll interface to control cgu

Mon, Jun 19, 2023 at 10:34:12PM CEST, arkadiusz.kubalewski@...el.com wrote:
>>From: Jiri Pirko <jiri@...nulli.us>
>>Sent: Saturday, June 10, 2023 6:37 PM
>>
>>Fri, Jun 09, 2023 at 02:18:51PM CEST, arkadiusz.kubalewski@...el.com wrote:
>>
>>[...]
>>
>>
>>>+static int ice_dpll_mode_get(const struct dpll_device *dpll, void *priv,
>>>+			     enum dpll_mode *mode,
>>>+			     struct netlink_ext_ack *extack)
>>>+{
>>>+	*mode = DPLL_MODE_AUTOMATIC;
>>
>>I don't understand how the automatic mode could work with SyncE. The
>>There is one pin exposed for one netdev. The SyncE daemon should select
>>exacly one pin. How do you achieve that?
>>Is is by setting DPLL_PIN_STATE_SELECTABLE on the pin-netdev you want to
>>select and DPLL_PIN_STATE_DISCONNECTED on the rest?
>>
>>
>>[...]
>
>AUTOMATIC mode autoselects highest priority valid signal.
>As you have pointed out, for SyncE selection, the user must be able to manually
>select a pin state to enable recovery of signal from particular port.
>
>In "ice" case there are 2 pins for network PHY clock signal recovery, and both
>are parent pins (MUX-type). There are also 4 pins assigned to netdevs (one per
>port). Thus passing a signal from PHY to the pin is done through the MUX-pin,
>by selecting proper state on pin-parent pair (where parent pins is highest prio
>pin on dpll).

Could you show me some examples please?


>
>Thank you!
>Arkadiusz