linux-kernel - Re: [PATCH v2 net 0/7] qbv cycle time extension/truncation

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Date:   Wed, 8 Nov 2023 17:51:44 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>
Cc:     Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 net 0/7] qbv cycle time extension/truncation

Hi Faizal,

On Tue, Nov 07, 2023 at 06:20:16AM -0500, Faizal Rahim wrote:
> According to IEEE Std. 802.1Q-2018 section Q.5 CycleTimeExtension,
> the Cycle Time Extension variable allows this extension of the last old
> cycle to be done in a defined way. If the last complete old cycle would
> normally end less than OperCycleTimeExtension nanoseconds before the new
> base time, then the last complete cycle before AdminBaseTime is reached
> is extended so that it ends at AdminBaseTime.
> 
> Changes in v2:
> 
> - Added 's64 cycle_time_correction' in 'sched_gate_list struct'.
> - Removed sched_changed created in v1 since the new cycle_time_correction
>   field can also serve to indicate the need for a schedule change.
> - Added 'bool correction_active' in 'struct sched_entry' to represent
>   the correction state from the entry's perspective and return corrected
>   interval value when active.
> - Fix cycle time correction logics for the next entry in advance_sched()
> - Fix and implement proper cycle time correction logics for current
>   entry in taprio_start_sched()
> 
> v1 at:
> https://lore.kernel.org/lkml/20230530082541.495-1-muhammad.husaini.zulkifli@intel.com/

I like what came of this patch series. Thanks for following up and
taking over. I have some comments on individual patches.