For P2P requests we must use the pci_p2pmem_[un]map_sg() functions instead of the dma_map_sg functions. With that, we can then indicate PCI_P2P support in the request queue. For this, we create an NVME_F_PCI_P2P flag which tells the core to set QUEUE_FLAG_PCI_P2P in the request queue.
This looks fine to me, Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx> Any plans adding the capability to nvme-rdma? Should be straight-forward... In theory, the use-case would be rdma backend fabric behind. Shouldn't be hard to test either...
