On Wed, Oct 28, 2015 at 10:48:54AM +0100, David Jander wrote: > > Hi all, > > I was unable to figure out who's maintaining > drivers/net/ethernet/freescale/fec_main.c, so I hope someone can help out on > this list... > > We have a board with a RMII phy connected to an i.MX6S. The hardware seems to > be ok, since I can receive and transmit ethernet frames without drops or > errors. However only simple things like ping and dhcp seemed to work. TCP/IP > connections could not be made. When looking at both ends with tcpdump, I > realized that all transmitted packages arrived at the other end with the TCP > and IP header checksums zeroed-out. > > After issuing the following command, TCP/IP started working correctly: > > $ ethtool --offload eth0 tx off > > This works around the issue. For some reason, when the FEC is in RMII mode, it > isn't filling in the checksums. > > On another board with an RGMII phy the same kernel works fine without the need > to disable offloading. What can possibly relate this functionality to the > choice of MAC interface?
You don't mention which kernel version you're using. There has been a bug here with older kernels... -- FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
