Re: [PATCH 6.1.y] net: enetc: VFs do not support HWTSTAMP_TX_ONESTEP_SYNC

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, Apr 13, 2026 at 11:23:22AM +0800, Charles Xu wrote:
> From: Wei Fang <wei.fang@nxp.com>
> 
> [ Upstream commit a562d0c4a893eae3ea51d512c4d90ab858a6b7ec ]
> 
> Actually ENETC VFs do not support HWTSTAMP_TX_ONESTEP_SYNC because only
> ENETC PF can access PMa_SINGLE_STEP registers. And there will be a crash
> if VFs are used to test one-step timestamp, the crash log as follows.
> 
> [  129.110909] Unable to handle kernel paging request at virtual address 00000000000080c0
> [  129.287769] Call trace:
> [  129.290219]  enetc_port_mac_wr+0x30/0xec (P)
> [  129.294504]  enetc_start_xmit+0xda4/0xe74
> [  129.298525]  enetc_xmit+0x70/0xec
> [  129.301848]  dev_hard_start_xmit+0x98/0x118
> 
> Fixes: 41514737ecaa ("enetc: add get_ts_info interface for ethtool")
> Cc: stable@vger.kernel.org
> Signed-off-by: Wei Fang <wei.fang@nxp.com>
> Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
> Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com>
> Link: https://patch.msgid.link/20250224111251.1061098-5-wei.fang@nxp.com
> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
> Signed-off-by: Charles Xu <charles_xu@189.cn>
> ---
>  drivers/net/ethernet/freescale/enetc/enetc.c         | 3 +++
>  drivers/net/ethernet/freescale/enetc/enetc_ethtool.c | 8 ++++++--
>  2 files changed, 9 insertions(+), 2 deletions(-)

This breaks the build, ALWAYS test-build your patches.

thanks,

greg k-h