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.
Thanks.
v3:
1. add map_inter to struct desc state to reocrd whether virtio core do dma map
v2:
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
v1:
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
virtqueue_resize()
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 | 342 +++++++++++++++++++++++++----------
include/linux/virtio.h | 4 +
3 files changed, 255 insertions(+), 97 deletions(-)
--
2.32.0.3.g01195cf9f
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