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(a)grimberg.me>
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...