Re: [PATCH net-next v3 08/14] net: ethernet: oa_tc6: Remove FCS size in RX frame

[Andrew Lunn]

On Tue, Jun 02, 2026 at 02:40:13AM +0000, Selvamani Rajagopal wrote:
> > 
> > On Fri, May 29, 2026 at 06:41:00PM +0000, Selvamani Rajagopal wrote:
> > > When MAC-PHY appends FCS to the incoming frame, FCS,
> > > it is removed from the frame before passing it to the stack.
> > 
> > What is missing from this commit message is an answer to the question
> > "Why?". Does the stack do something wrong if there is a FCS at the end
> > of the frame?
> 
> That was a little mystery to me as well when our SQA alerted me with the issue.
> When I tested, ping worked fine without any issue even with the frames with FCS appended. 
> But strangely ptp4l utility failed with invalid data size. Once we removed FCS, it worked fine.
> 
> Will add this reason in the commit message.

Please take a look at NETIF_F_RXFCS.

       Andrew