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Date: Fri, 21 Jan 2022 22:17:56 +0100 From: Andrew Lunn <andrew@...n.ch> To: Tim Harvey <tharvey@...eworks.com> Cc: netdev <netdev@...r.kernel.org> Subject: Re: best way to disable ANEG and force ethernet link? On Fri, Jan 21, 2022 at 09:20:45AM -0800, Tim Harvey wrote: > Greetings, > > I'm troubleshooting a network issue and am looking for the best way to > force link speed/duplex without using auto-negotiation. Hi Tim man ethtool ethtool -s devname [speed N] [lanes N] [duplex half|full] [port tp|aui|bnc|mii] [mdix auto|on|off] [autoneg on|off] [advertise N[/M] | advertise mode on|off ...] [phyad N] [xcvr internal|external] [wol N[/M] | wol p|u|m|b|a|g|s|f|d...] [sopass xx:yy:zz:aa:bb:cc] [master-slave preferred- master|preferred-slave|forced-master|forced-slave] [msglvl N[/M] | msglvl type on|off ...] so try ethtool -s eth42 autoneg off duplex full speed 10 > In case it matters I have two boards that I would like to do this on: > an IMX8MM with FEC MAC and a CN803X with an RGMII (thunderx) vnic MAC. > Both have a GPY111 (Intel Xway) PHY. It does require MAC and PHY support. So you will have to try it and see. fec_main just calls phy_ethtool_set_link_ksettings. So there is a good chance this works for the FEC. drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c does not implement .set_link_ksettings, so you might be out of luck there. gpy_config_aneg() looks like it does something sensible. But the devil is in the detail... Andrew
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