On Thu, Sep 16, 2021 at 05:40:51PM -0600, Logan Gunthorpe wrote: > Introduce the helper function ib_dma_pci_p2p_dma_supported() to check > if a given ib_device can be used in P2PDMA transfers. This ensures > the ib_device is not using virt_dma and also that the underlying > dma_device supports P2PDMA. > > Use the new helper in nvme-rdma to replace the existing check for > ib_uses_virt_dma(). Adding the dma_pci_p2pdma_supported() check allows > switching away from pci_p2pdma_[un]map_sg(). > > Signed-off-by: Logan Gunthorpe <[email protected]> > --- > drivers/nvme/target/rdma.c | 2 +- > include/rdma/ib_verbs.h | 11 +++++++++++ > 2 files changed, 12 insertions(+), 1 deletion(-)
Reviewed-by: Jason Gunthorpe <[email protected]> > +/* > + * Check if a IB device's underlying DMA mapping supports P2PDMA transfers. > + */ > +static inline bool ib_dma_pci_p2p_dma_supported(struct ib_device *dev) > +{ > + if (ib_uses_virt_dma(dev)) > + return false; If someone wants to make rxe/hfi/qib use this stuff then they will have to teach the the driver to do all the p2p checks and add some struct ib_device flag Jason _______________________________________________ iommu mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/iommu
