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Message-ID: <fc4f148d-d4d3-4994-8d36-c382c13ba52b@kernel.org>
Date: Mon, 26 Feb 2024 14:18:22 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Siddharth Vadapalli <s-vadapalli@...com>
Cc: Chintan Vankar <c-vankar@...com>, Dan Carpenter
<dan.carpenter@...aro.org>, Richard Cochran <richardcochran@...il.com>,
Paolo Abeni <pabeni@...hat.com>, Jakub Kicinski <kuba@...nel.org>,
Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
Pekka Varis <p-varis@...com>
Subject: Re: [PATCH net-next 2/2] net: ethernet: ti: am65-cpsw: Enable RX HW
timestamp only for PTP packets
On 24/02/2024 10:59, Siddharth Vadapalli wrote:
> On Mon, Feb 19, 2024 at 12:59:55PM +0200, Roger Quadros wrote:
>> Hi,
>>
>> On 15/02/2024 13:09, Chintan Vankar wrote:
>>> The CPSW peripherals on J7AHP, J7VCL, J7AEP, J7ES, AM64 SoCs have
>>> an errata i2401 "CPSW: Host Timestamps Cause CPSW Port to Lock up".
>>
> ...
>
>>>
>>> @@ -856,6 +852,9 @@ static int am65_cpsw_nuss_rx_packets(struct am65_cpsw_common *common,
>>> ndev_priv = netdev_priv(ndev);
>>> am65_cpsw_nuss_set_offload_fwd_mark(skb, ndev_priv->offload_fwd_mark);
>>> skb_put(skb, pkt_len);
>>> + skb_reset_mac_header(skb);
>>
>> Why do you need to add skb_reset_mac_header here?
>>
>>> + if (port->rx_ts_enabled)
>>> + am65_cpts_rx_timestamp(common->cpts, skb);
>>
>> The timestamp should be added before you do skb_put().
>
> Roger,
>
> Could you please clarify why the timestamp should be added before
> skb_put()?
My bad. hwtimestamps lies after skb->end so it doesn't matter.
--
cheers,
-roger
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