On Tue, Mar 28, 2017 at 11:49:50AM +1100, Benjamin Herrenschmidt wrote: > Hi ! > > I noticed that flow control isn't being enabled on a system I'm > working on by default. I've tracked it down to two things: > > - The realtec.c PHY driver doesn't have Pause or Asym_Pause in > its exposed capabilities. This is in part because PHY_GBIT_FEATURES > does not include SUPPORTED_Pause and SUPPORTED_Asym_Pause. Is there > a specific reason for that ?
Hi Ben It is worth reading Documentation/networking/phy.txt The MAC should set SUPPORTED_Pause and SUPPORTED_Asym_Pause if the MAC supports these features. The PHY will then negotiate them. Andrew