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Message-ID: <20151028104854.025430ce@archvile> Date: Wed, 28 Oct 2015 10:48:54 +0100 From: David Jander <david@...tonic.nl> To: netdev@...r.kernel.org Cc: linux-arm-kernel@...ts.infradead.org Subject: BUG: fsl FEC ethernet tx checksum offloading doesn't work with RMII interface 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? Best regards, -- David Jander Protonic Holland. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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