Hi Everyone,
Hi Logan,
Here's v2 of our series to introduce P2P based copy offload to NVMe fabrics. This version has been rebased onto v4.16-rc3 which already includes Christoph's devpagemap work the previous version was based off as well as a couple of the cleanup patches that were in v1. Additionally, we've made the following changes based on feedback: * Renamed everything to 'p2pdma' per the suggestion from Bjorn as well as a bunch of cleanup and spelling fixes he pointed out in the last series. * To address Alex's ACS concerns, we change to a simpler method of just disabling ACS behind switches for any kernel that has CONFIG_PCI_P2PDMA. * We also reject using devices that employ 'dma_virt_ops' which should fairly simply handle Jason's concerns that this work might break with the HFI, QIB and rxe drivers that use the virtual ops to implement their own special DMA operations.
That's good, but what would happen for these devices? simply fail the mapping causing the ulp to fail its rdma operation? I would think that we need a capability flag for devices that support it.
