HI Brandon, You haven't given us much to go on here. Is this on x86 (Intel) architecture or something else? Is the system cache coherent? Is it set up of big or little end-in? If the DD bit is never getting set it could be a cache coherency problem of some kind. Have you done a PCI bus trace to see what's happening on bus? Did the 82574 fetch the receive descriptors? Is the device writing the packets into host memory and just never setting the DD bit?
Let us know. We may have other ideas if you tell us more? Also, does running Linux and the Linux driver on that same HW work? Cheers, John > -----Original Message----- > From: Brandon Falk [mailto:bf...@gamozolabs.com] > Sent: Saturday, December 27, 2014 7:40 PM > To: e1000-devel@lists.sourceforge.net > Subject: [E1000-devel] Porting 82574L driver to 82576 RX problems > > I hope this mailing list is not specifically just for UNIX dev. > > I have a custom OS (not based on any existing OS) that has a 82574L driver. > It's very minimal but it's capable of RX and TX at gigabit speeds with UDP. > > I got a new box with an 82576 NIC and booted up my OS on it. TX worked out > of the box but RX is having problems. Basically I poll for RX descriptor flags > until DD is set. Descriptor done simply is never getting set on the > 82576 machine. > > Anyone have an idea of what problem I may be having? Is there some > filtering that is done by default? I run with unicast promiscuous and > multicast > promiscuous as well as accept broadcast packets. I'm only doing a single > queue, and I reset the device fully in my OS. > > -B ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ E1000-devel mailing list E1000-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/e1000-devel To learn more about Intel® Ethernet, visit http://communities.intel.com/community/wired
