<html xmlns="http://www.w3.org/1999/xhtml"> <head> <title></title> </head> <body> <div name="messageBodySection"> <div dir="auto">This is mostly a heads up....<br /> <br /> We (WEKA) use various drivers with specific alignment requirements, which causes us to need to need to use multibuffer (scatter/gather) functionality in various drivers.<br /> <br /> Unfortunately, the GVNIC driver was ... very... buggy in this regard (in fact it doesn't work at all in this case!), especially for the DQO mode used on gen 3 (C3) instances. It turns out it was also buggy in that it was not properly resetting the device on teardown, creating a situation where DMA could be occurring to memory regions after process exit (and thus to invalid memory!)<br /> <br /> I've fixed this in our code (its still under review and testing internally) -- but I'd like to upstream these fixes too. (For benefit of anyone who may have concerns about my "credentials" -- I'm well known for my work in NIC drivers (and many others) in Solaris/illumos, and to a lesser extent (and longer ago) NetBSD.<br /> <br /> Anyway, I think I have the detailed instructions for submitting changes to DPDK, but as this is code that is associated with a vendor (Google), I thought I'd reach out first -- if there is a specific code owner here I'd be happy to work with them.<br /> <br /> My changes are based on a cherry pick of this driver's code from the upstream 24.07, but mostly we (WEKA) are using DPDK 24.03.<br /> <br /> Thanks in advance.<br /></div> </div> </body> </html>