virtqueue_add() only supports virtual addresses, dma is completed in virtqueue_add(). In some scenarios (such as the AF_XDP scenario), DMA is completed in advance, so it is necessary for us to support passing the DMA address to virtqueue_add(). Record this predma information in extra->flags, which can be skipped when executing dma unmap. v1: 1. All sgs requested at one time are required to be unified PREDMA, and several of them are not supported to be PREDMA 2. virtio_dma_map() is removed from this patch set and will be submitted together with the next time AF_XDP supports virtio dma 3. Added patch #2 #3 to remove the check for flags when performing unmap indirect desc Xuan Zhuo (6): virtio: rename vring_unmap_state_packed() to vring_unmap_extra_packed() virtio: remove flags check for unmap split indirect desc virtio: remove flags check for unmap packed indirect desc virtio: virtqueue_add() support predma virtio: split: virtqueue_add_split() support dma address virtio: packed: virtqueue_add_packed() support dma address drivers/virtio/virtio_ring.c | 199 ++++++++++++++++++++++------------- 1 file changed, 126 insertions(+), 73 deletions(-) -- 2.31.0 _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization