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Message-ID: <b1625848-4207-44a7-be1e-435afe483a4d@intel.com>
Date: Wed, 2 Sep 2026 14:25:59 +0300
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Subject: Re: [Intel-wired-lan] [PATCH net v2] igc: Fix RX HW timestamp
 reporting when NET_RX_BUSY_POLL is disabled
To: Ding Meng <meng.ding@siemens.com>, <anthony.l.nguyen@intel.com>,
 <przemyslaw.kitszel@intel.com>, <andrew+netdev@lunn.ch>,
 <davem@davemloft.net>, <edumazet@google.com>, <kuba@kernel.org>,
 <pabeni@redhat.com>, <jan.kiszka@siemens.com>, <florian.bezdeka@siemens.com>
CC: <intel-wired-lan@lists.osuosl.org>, <linux-kernel@vger.kernel.org>,
 <netdev@vger.kernel.org>, <wq.wang@siemens.com>, <pmenzel@molgen.mpg.de>,
 <stable@vger.kernel.org>, Aleksandr Loktionov
 <aleksandr.loktionov@intel.com>, Piotr Kwapulinski
 <piotr.kwapulinski@intel.com>
References: <20260630112056.885071-1-meng.ding@siemens.com>
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From: "Dahan, AvigailX" <avigailx.dahan@intel.com>
In-Reply-To: <20260630112056.885071-1-meng.ding@siemens.com>
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On 30/06/2026 14:15, Ding Meng via Intel-wired-lan wrote:
> When CONFIG_NET_RX_BUSY_POLL is deactivated, fetching RX HW timestamps
> from the NIC no longer works as expected, often resulting in incorrect
> or negative values such as "HW raw -121948.050407424".
>
> This occurs because disabling CONFIG_NET_RX_BUSY_POLL disables the
> SKB NAPI mapping in __skb_mark_napi_id(). Consequently, get_timestamp()
> fails to perform its driver lookup, and the igc driver's struct
> net_device_ops::ndo_get_tstamp is never invoked.
>
> Instead, get_timestamp() falls back to use shhwtstamps(skb)->hwtstamp,
> a field that the driver has not populated. This results in incorrect
> timestamps.
>
> Fix this by populating the hwtstamp field with the correct timestamp
> in the default timer when CONFIG_NET_RX_BUSY_POLL is disabled.
> The "igc_adapter" is passed to igc_construct_skb() to enable
> igc_ptp_rx_pktstamp() to access the necessary adapter details for
> adjusting the timestamp.
>
> Test case:
>   Disable CONFIG_NET_RX_BUSY_POLL.
>   Sender:
>   # tools/testing/selftests/net/timestamping en0 \
>          SOF_TIMESTAMPING_TX_HARDWARE PTPV2 IP_MULTICAST_LOOP
>   Receiver:
>   # tools/testing/selftests/net/timestamping en0 \
>          SOF_TIMESTAMPING_RX_HARDWARE SOF_TIMESTAMPING_RAW_HARDWARE PTPV2
>
> Before patch, receiver prints
>   HW raw -121948.050407424
> After patch, receiver prints
>   HW raw 1760648763.746974064
>
> Fixes: 069b142f5819 ("igc: Add support for PTP .getcyclesx64()")
> Cc:stable@vger.kernel.org
> Co-developed-by: Florian Bezdeka<florian.bezdeka@siemens.com>
> Signed-off-by: Florian Bezdeka<florian.bezdeka@siemens.com>
> Signed-off-by: Ding Meng<meng.ding@siemens.com>
> Reviewed-by: Aleksandr Loktionov<aleksandr.loktionov@intel.com>
> Reviewed-by: Piotr Kwapulinski<piotr.kwapulinski@intel.com>
> ---
> V2:
>    - update commit message(suggested by Paul Menzel):
>        add error log
>        explain why need to pass igc_adapter
>        add test case
>    - move variable declarations on top of the function
>    - Ccstable@vger.kernel.org
> V1:https://lore.kernel.org/intel-wired-lan/20260622041718.6106-1-meng.ding@siemens.com/
> ---
>   drivers/net/ethernet/intel/igc/igc_main.c | 41 ++++++++++++++++-------
>   1 file changed, 29 insertions(+), 12 deletions(-)
>
Tested-by: Avigail Dahan <avigailx.dahan@intel.com>

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    <p><br>
    </p>
    <div class="moz-cite-prefix">On 30/06/2026 14:15, Ding Meng via
      Intel-wired-lan wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:20260630112056.885071-1-meng.ding@siemens.com">
      <pre wrap="" class="moz-quote-pre">When CONFIG_NET_RX_BUSY_POLL is deactivated, fetching RX HW timestamps
from the NIC no longer works as expected, often resulting in incorrect
or negative values such as &quot;HW raw -121948.050407424&quot;.

This occurs because disabling CONFIG_NET_RX_BUSY_POLL disables the
SKB NAPI mapping in __skb_mark_napi_id(). Consequently, get_timestamp()
fails to perform its driver lookup, and the igc driver's struct
net_device_ops::ndo_get_tstamp is never invoked.

Instead, get_timestamp() falls back to use shhwtstamps(skb)-&gt;hwtstamp,
a field that the driver has not populated. This results in incorrect
timestamps.

Fix this by populating the hwtstamp field with the correct timestamp
in the default timer when CONFIG_NET_RX_BUSY_POLL is disabled.
The &quot;igc_adapter&quot; is passed to igc_construct_skb() to enable
igc_ptp_rx_pktstamp() to access the necessary adapter details for
adjusting the timestamp.

Test case:
 Disable CONFIG_NET_RX_BUSY_POLL.
 Sender:
 # tools/testing/selftests/net/timestamping en0 \
        SOF_TIMESTAMPING_TX_HARDWARE PTPV2 IP_MULTICAST_LOOP
 Receiver:
 # tools/testing/selftests/net/timestamping en0 \
        SOF_TIMESTAMPING_RX_HARDWARE SOF_TIMESTAMPING_RAW_HARDWARE PTPV2

Before patch, receiver prints
 HW raw -121948.050407424
After patch, receiver prints
 HW raw 1760648763.746974064

Fixes: 069b142f5819 (&quot;igc: Add support for PTP .getcyclesx64()&quot;)
Cc: <a class="moz-txt-link-abbreviated" href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>
Co-developed-by: Florian Bezdeka <a class="moz-txt-link-rfc2396E" href="mailto:florian.bezdeka@siemens.com">&lt;florian.bezdeka@siemens.com&gt;</a>
Signed-off-by: Florian Bezdeka <a class="moz-txt-link-rfc2396E" href="mailto:florian.bezdeka@siemens.com">&lt;florian.bezdeka@siemens.com&gt;</a>
Signed-off-by: Ding Meng <a class="moz-txt-link-rfc2396E" href="mailto:meng.ding@siemens.com">&lt;meng.ding@siemens.com&gt;</a>
Reviewed-by: Aleksandr Loktionov <a class="moz-txt-link-rfc2396E" href="mailto:aleksandr.loktionov@intel.com">&lt;aleksandr.loktionov@intel.com&gt;</a>
Reviewed-by: Piotr Kwapulinski <a class="moz-txt-link-rfc2396E" href="mailto:piotr.kwapulinski@intel.com">&lt;piotr.kwapulinski@intel.com&gt;</a>
---
V2:
  - update commit message(suggested by Paul Menzel):
      add error log
      explain why need to pass igc_adapter
      add test case
  - move variable declarations on top of the function
  - Cc <a class="moz-txt-link-abbreviated" href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>
V1: <a class="moz-txt-link-freetext" href="https://lore.kernel.org/intel-wired-lan/20260622041718.6106-1-meng.ding@siemens.com/">https://lore.kernel.org/intel-wired-lan/20260622041718.6106-1-meng.ding@siemens.com/</a>
---
 drivers/net/ethernet/intel/igc/igc_main.c | 41 ++++++++++++++++-------
 1 file changed, 29 insertions(+), 12 deletions(-)

</pre>
    </blockquote>
    <p><span style="white-space: pre-wrap">
</span></p>
    <p><span data-teams="true"><span style="font-size: inherit;">Tested-by:
          Avigail Dahan <a class="moz-txt-link-rfc2396E" href="mailto:avigailx.dahan@intel.com">&lt;avigailx.dahan@intel.com&gt;</a></span></span><span style="white-space: pre-wrap">
</span></p>
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