[PATCH vhost v5 00/11] virtio core prepares for AF_XDP

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XDP socket(AF_XDP) is an excellent bypass kernel network framework. The zero
copy feature of xsk (XDP socket) needs to be supported by the driver. The
performance of zero copy is very good.

ENV: Qemu with vhost.

                   vhost cpu | Guest APP CPU |Guest Softirq CPU | PPS
xmit by sockperf:     90%    |   100%        |                  |  318967
xmit by xsk:          100%   |   30%         |   33%            | 1192064
recv by sockperf:     100%   |   68%         |   100%           |  692288
recv by xsk:          100%   |   33%         |   43%            |  771670

Before achieving the function of Virtio-Net, we also have to let virtio core
support these features:

1. virtio core support premapped
2. virtio core support reset per-queue
3. introduce DMA APIs to virtio core

Please review.


 1. fix for error handler
 2. add flags to record internal dma mapping

 1. rename map_inter to dma_map_internal
 2. fix: Excess function parameter 'vq' description in 'virtqueue_dma_dev'

 1. add map_inter to struct desc state to reocrd whether virtio core do dma map

 1. based on sgs[0]->dma_address to judgment is premapped
 2. based on extra.addr to judgment to do unmap for no-indirect desc
 3. based on indir_desc to judgment to do unmap for indirect desc
 4. rename virtqueue_get_dma_dev to virtqueue_dma_dev

 1. expose dma device. NO introduce the api for dma and sync
 2. split some commit for review.

Xuan Zhuo (11):
  virtio_ring: split: separate dma codes
  virtio_ring: packed: separate dma codes
  virtio_ring: packed-indirect: separate dma codes
  virtio_ring: split: support premapped
  virtio_ring: packed: support premapped
  virtio_ring: packed-indirect: support premapped
  virtio_ring: update document for virtqueue_add_*
  virtio_ring: introduce virtqueue_dma_dev()
  virtio_ring: correct the expression of the description of
  virtio_ring: separate the logic of reset/enable from virtqueue_resize
  virtio_ring: introduce virtqueue_reset()

 drivers/virtio/virtio.c      |   6 +
 drivers/virtio/virtio_ring.c | 351 +++++++++++++++++++++++++----------
 include/linux/virtio.h       |   4 +
 3 files changed, 264 insertions(+), 97 deletions(-)


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