On Wed, 23 Nov 2005, Jeff Garzik wrote: > Alan Cox wrote: > >>Additionally, current IOAT is memory->memory. I would love to be able > >>to convince Intel to add transforms and checksums, > > > > > > Not just transforms but also masks and maybe even merges and textures > > would be rather handy 8) > > > Ah yes: I totally forgot to mention XOR. > > Software RAID would love that.
A number of embedded processors already have HW that does these kinda of things. On Freescale PPC processors there have been general purpose DMA engines for mem<->mem and more recently and additional crypto engines that allow for hashing, XOR, and security. I'm actually searching for any examples of drivers that deal with the issues related to DMA'ng directly two and from user space memory. I have an ioctl based driver that does copies back and forth between user and kernel space and would like to remove that since the crypto engine has full scatter/gather capability. The only significant effort I've come across is Peter Chubb's work for user mode drivers which has some code for handling pinning of the user space memory and what looks like generation of a scatter list. - kumar - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
