netdev - Re: [net-next 10/11] net/mlx5e: kTLS, Add kTLS RX resync support

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Message-ID: <2293c868-30d3-7c06-0f4a-4e06e5c51f68@mellanox.com>
Date:   Thu, 4 Jun 2020 14:04:28 +0300
From:   Boris Pismenny <borisp@...lanox.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Tariq Toukan <tariqt@...lanox.com>
Subject: Re: [net-next 10/11] net/mlx5e: kTLS, Add kTLS RX resync support

On 02/06/2020 21:27, Jakub Kicinski wrote:
> On Tue, 2 Jun 2020 07:23:53 +0300 Boris Pismenny wrote:
>> On 02/06/2020 1:12, Jakub Kicinski wrote:
>>> On Sun, 31 May 2020 15:06:28 +0300 Boris Pismenny wrote:  
>>>> On 30/05/2020 0:50, Jakub Kicinski wrote:
>>>>  
>>>>> IIUC every ooo packet causes a resync request in your
>>>>> implementation - is that true?
>>>>>     
>>>> No, only header loss. We never required a resync per OOO packet. I'm
>>>> not sure why would you think that.  
>>> I mean until device is back in sync every frame kicks off
>>> resync_update_sn() and tries to queue the work, right?
>>>  
>> Nope, only the first frame triggers resync_update_sn, so as to keep
>> the process efficient and avoid spamming the system with resync
>> requests. Per-flow, the device will try again to trigger
>> resync_update_sn only if it gets out of sync due to out-of-sequence
>> record headers.
> It'd be good to clarify what the ooo counter counts in the
> documentation, it sounds like it counts first TLS header HW found 
> after seq discontinuity is detected?
>
> In fact calling this a ooo counter may be slightly misleading, I like
> the nfp counters much more: tx_tls_resync_req_ok and
> tx_tls_resync_req_ign.

I agree. We will add it to mlx5 and document.Thanks!