Normally, if you're doing "single fiber optics" it basically means you have
a single color/frequency in one direction, and another color/frequency,
which is slightly offset.  e.g. They say blue for send, and purple for
recieve, or something like that.  It's hard to screw it up, but I've
definitely tried :)

On Sun, Oct 15, 2023 at 4:21 PM Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Sun, 15 Oct 2023 10:30:48 +0330
> Alireza Sadeghpour <alireza0101sadeghpour@gmail.com> wrote:
>
> > Hi,
> >
> > I am trying to establish a uni-directional Ethernet link where a singular
> > fiber is used to transmit data to the receiver in the DPDK environment.
> The
> > Rx of the transmit side and the Tx of the receive side are not physically
> > connected, like in a Data diode scenario. The ethernet controller on both
> > sides is intel 82580.
> >
> > my problem is that when I detach the RX line from one side, both sides'
> > links go down.
> >
> > Could anyone please give me some advice to solve this problem and
> establish
> > a valid unidirectional ethernet link?
>
> This is not a DPDK problem. Trying to non-standard configuration like this
> requires detailed knowledge of the hardware registers, and likely driver
> specific
> changes to do that.
>
> It is possible to bring up device in normal full duplex mode and even setup
> the receive queues but ignore them. But that doesn't sound like what you
> want.
>


-- 
Regards,
Dave Seddon
+1 415 857 5102