Function vhost_log_cache_page

dpdk/lib/vhost/vhost.c:226–265

}

static __rte_always_inline void
vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
			uint64_t page)
{
	uint32_t bit_nr = page % (sizeof(unsigned long) << 3);
	uint32_t offset = page / (sizeof(unsigned long) << 3);
	int i;

	if (unlikely(!vq->log_cache)) {
		/* No logging cache allocated, write dirty log map directly */
		rte_atomic_thread_fence(rte_memory_order_release);
		vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);

		return;
	}

	for (i = 0; i < vq->log_cache_nb_elem; i++) {
		struct log_cache_entry *elem = vq->log_cache + i;

		if (elem->offset == offset) {
			elem->val |= (1UL << bit_nr);
			return;
		}
	}

	if (unlikely(i >= VHOST_LOG_CACHE_NR)) {
		/*
		 * No more room for a new log cache entry,
		 * so write the dirty log map directly.
		 */
		rte_atomic_thread_fence(rte_memory_order_release);
		vhost_log_page((uint8_t *)(uintptr_t)dev->log_base, page);

		return;
	}

	vq->log_cache[i].offset = offset;
	vq->log_cache[i].val = (1UL << bit_nr);
	vq->log_cache_nb_elem++;
}

void
__vhost_log_cache_write(struct virtio_net *dev, struct vhost_virtqueue *vq,