On Tue, Mar 16, 2021 at 03:28:51PM +0000, Stefan Chulski wrote: > No XDP doesn't require this. One of the use cases of the port reservation > feature is the Marvell User Space SDK (MUSDK) which its latest code is > publicly available here: > https://github.com/MarvellEmbeddedProcessors/musdk-marvell > You can find example use case for this application here: > http://wiki.macchiatobin.net/tiki-index.php?page=MUSDK+Introduction
I really, really hope that someone has thought this through: Packet Processor I/O Interface (PPIO) The MUSDK PPIO driver provides low-level network interface API for User-Space network drivers/applications. The PPIO infrastrcuture maps Marvell's Packet Processor (PPv2) configuration space and I/O descriptors space directly to user-space memory. This allows user-space driver/application to directly process the packet processor I/O rings from user space, without any overhead of a copy operation. I realy, really hope that you are not exposing the I/O descriptors to userspace, allowing userspace to manipulate the physical addresses in those descriptors, and that userspace is not dealing with physical addresses. If userspace has access to the I/O descriptors with physical addresses, or userspace is dealing with physical addresses, then you can say good bye to any kind of security on the platform. Essentially, in such a scenario, the entire system memory becomes accessible to userspace, which includes the kernel. -- RMK's Patch system: https://www.armlinux.org.uk/developer/patches/ FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!
