On Tue, 11 Sep 2018 18:45:49 -0300 Dan Gora <d...@adax.com> wrote: > Hi All, > > So I implemented the "write to /sys/devices/virtual/net/*/carrier" > method to change the link status, but there is one more minor thing > that I wanted to point out about this approach. The problem is that > you cannot read or write the '/sys/devices/virtual/net/*/carrier' file > while the interface is marked 'down'. This means that link status > changes can only be performed by the DPDK application while the > interface is in the "up" state. With the ioctl method, you can change > the carrier state at pretty much any time. > > Is this a problem? It's not a huge one, I guess, but it is something > else to consider. > > Please let me know what you all think. > > thanks > dan
The carrier state has no meaning when device is down, at least for physical devices. Because often the PHY is powered off when the device is marked down.
