Hi all, I have a question about the vring_avail: It only includes an idx (equivalent to the ring tail), which is used by the frontend (virtio_net) to fill bufs. The backend (e.g. vhost_net) maintains the ring head (last_avail_idx) by itself. The frontend checks if the ring is full or empty via a counter (vq->num_free). My question is why can't we include the ring head in the vring_avail struct, so that the vq->num_free is not needed, and the backend can directly use it without maintaining its own copy?
Thanks, Wei
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