Displaying 3 results from an estimated 3 matches for "virtqueue_get_buf_premap".
2023 Jun 02
12
[PATCH vhost v10 00/10] virtio core prepares for AF_XDP
## About DMA APIs
Now, virtio may can not work with DMA APIs when virtio features do not have
VIRTIO_F_ACCESS_PLATFORM.
1. I tried to let DMA APIs return phy address by virtio-device. But DMA APIs just
work with the "real" devices.
2. I tried to let xsk support callballs to get phy address from virtio-net
driver as the dma address. But the maintainers of xsk may want to use
2023 Jun 02
12
[PATCH vhost v10 00/10] virtio core prepares for AF_XDP
## About DMA APIs
Now, virtio may can not work with DMA APIs when virtio features do not have
VIRTIO_F_ACCESS_PLATFORM.
1. I tried to let DMA APIs return phy address by virtio-device. But DMA APIs just
work with the "real" devices.
2. I tried to let xsk support callballs to get phy address from virtio-net
driver as the dma address. But the maintainers of xsk may want to use
2023 Jun 22
1
[PATCH vhost v10 10/10] virtio_net: support dma premapped
...return buf;
> +}
> +
> +static void *virtnet_get_buf_ctx(struct virtqueue *vq, bool premapped, u32 *len, void **ctx)
> +{
> + struct virtqueue_detach_cursor cursor;
> + void *buf;
> +
> + if (!premapped)
> + return virtqueue_get_buf_ctx(vq, len, ctx);
> +
> + buf = virtqueue_get_buf_premapped(vq, len, ctx, &cursor);
> + if (buf)
> + virtnet_generic_unmap(vq, &cursor);
> +
> + return buf;
> +}
> +
> +#define virtnet_rq_get_buf(rq, plen, pctx) \
> +({ \
> + typeof(rq) _rq = (rq); \
> + virtnet_get_buf_ctx(_rq->vq, _rq->premapped, plen, pctx)...