On Mon, May 29, 2017 at 03:58:33PM +0000, Ilan Tayari wrote: > > From: Jason Gunthorpe [mailto:jguntho...@obsidianresearch.com] > > Subject: Re: [for-next 4/6] net/mlx5: FPGA, Add basic support for Innova > > > > On Sun, May 28, 2017 at 07:22:27AM +0000, Ilan Tayari wrote: > > > > > This is neither PCI-bar mapped, nor mailbox command. > > > The FPGA is indeed a bump-on-the-wire. > > > (It has I2C to the CX4 chip, but that is for debug purposes, and too > > slow > > > to perform real programming) > > > > Wait.. So if it truely has nothing to do with the existing mellanox > > driver, then nothing more than the fpga loader should be in the mlx5 > > directory? > > True, except in specific cases when the FPGA may mangle the packets in > a way that the netdevice configures, and the driver needs to adapt the > data path.
> Such is the case of IPSec and TLS offloads. > Those are tied to the mlx5 Ethernet driver (isolated with a kconfig). But there is nothing stopping this sort of FPGA mangling logic being downstream of any NIC, Mellanox is just the first to do this. I think you'd be better to add something to the net stack to model this post-nic mangling hardware, than trying to hide it in a driver. Jason
