On Wed, 30 Mar 2022 06:51:03 -0400, "Michael S. Tsirkin" <[email protected]> wrote: > On Wed, Mar 30, 2022 at 05:03:32PM +0800, Xuan Zhuo wrote: > > On Wed, 30 Mar 2022 16:38:18 +0800, Jason Wang <[email protected]> wrote: > > > On Wed, Mar 30, 2022 at 2:59 PM Xuan Zhuo <[email protected]> > > > wrote: > > > > > > > > On Wed, 30 Mar 2022 14:56:17 +0800, Jason Wang <[email protected]> > > > > wrote: > > > > > On Wed, Mar 30, 2022 at 2:34 PM Michael S. Tsirkin <[email protected]> > > > > > wrote: > > > > > > > > > > > > On Thu, Feb 24, 2022 at 07:03:53PM +0800, Xuan Zhuo wrote: > > > > > > > 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(). > > > > > > > > > > > > I picked up a couple of patches. Others are waiting for some acks > > > > > > (Jason?) and improved commit logs for documentation. > > > > > > > > > > I will review them. > > > > > > > > hi, the core code of premapped, I will merge it into 'virtio pci support > > > > VIRTIO_F_RING_RESET' because this function will be used when reusing > > > > the buffer > > > > after resize. > > > > > > I still prefer not to do that. > > > > > > We can make rest work for resize first and add pre mapping on top. It > > > will simplify the review. > > > > Yes, I am also worried about the review problem, the number of my local > > resize > > patch has reached 44 (including reuse bufs). > > > > hi, Michael, can we implement resize on top of v8 first? (drop unused bufs > > directly) > > > > Then we implement premmapd and reuse the bufs after resize. > > > > We need to get the address (DMA address) and len from the reset ring and > > submit > > it to the new vq through virtqueue_add(). So let virtqueue_add() support > > premapped first. > > > > Thanks. > > Not sure I understand. > So the plan is > - remap > - resize on top > ?
#1 resize with drop unused bufs directly #2 premapped and resize support reuse the unused bufs This way "premaped" will have a user. Between #1 and #2, I may submit some code with optimized formatting, because jason doesn't like my introduction of struct vring_split and struct vring_packed in #1 for passing parameters between extracted functions. Thanks. > > > > > > > > > > > Thanks > > > > > > > > > > > Thanks. > > > > > > > > > > > > > > > > > > Thanks > > > > > > > > > > > > > > > > > Thanks! > > > > > > > > > > > > > v2: > > > > > > > 1. rename predma -> premapped > > > > > > > 2. virtio net xdp tx use virtio dma api > > > > > > > > > > > > > > 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 (9): > > > > > > > virtio_ring: rename vring_unmap_state_packed() to > > > > > > > vring_unmap_extra_packed() > > > > > > > virtio_ring: remove flags check for unmap split indirect desc > > > > > > > virtio_ring: remove flags check for unmap packed indirect desc > > > > > > > virtio_ring: virtqueue_add() support premapped > > > > > > > virtio_ring: split: virtqueue_add_split() support premapped > > > > > > > virtio_ring: packed: virtqueue_add_packed() support premapped > > > > > > > virtio_ring: add api virtio_dma_map() for advance dma > > > > > > > virtio_ring: introduce virtqueue_add_outbuf_premapped() > > > > > > > virtio_net: xdp xmit use virtio dma api > > > > > > > > > > > > > > drivers/net/virtio_net.c | 42 +++++- > > > > > > > drivers/virtio/virtio_ring.c | 280 > > > > > > > ++++++++++++++++++++++++++--------- > > > > > > > include/linux/virtio.h | 12 ++ > > > > > > > 3 files changed, 254 insertions(+), 80 deletions(-) > > > > > > > > > > > > > > -- > > > > > > > 2.31.0 > > > > > > > > > > > > > > > > > > > _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
