Re: [PATCH vhost 12/22] virtio_net: xsk: bind/unbind xsk

On Wed, Oct 11, 2023 at 05:27:18PM +0800, Xuan Zhuo wrote:

...

+static int virtnet_xsk_pool_disable(struct net_device *dev, u16 qid)
+{
+	struct virtnet_info *vi = netdev_priv(dev);
+	struct device *dma_dev;
+	struct virtnet_rq *rq;
+	struct virtnet_sq *sq;
+	int err1, err2;
+
+	if (qid >= vi->curr_queue_pairs)
+		return -EINVAL;
+
+	sq = &vi->sq[qid];
+	rq = &vi->rq[qid];
+
+	dma_dev = virtqueue_dma_dev(rq->vq);
+
+	dma_unmap_single(dma_dev, sq->xsk.hdr_dma_address, vi->hdr_len, DMA_TO_DEVICE);
+
+	xsk_pool_dma_unmap(sq->xsk.pool, 0);

nit: the line above makes Sparse a bit unhappy:

 .../xsk.c:168:35: warning: incorrect type in argument 1 (different address spaces)
 .../xsk.c:168:35:    expected struct xsk_buff_pool *pool
 .../xsk.c:168:35:    got struct xsk_buff_pool [noderef] __rcu *pool

+
+	/* Sync with the XSK wakeup and with NAPI. */
+	synchronize_net();
+
+	err1 = virtnet_sq_bind_xsk_pool(vi, sq, NULL);
+	err2 = virtnet_rq_bind_xsk_pool(vi, rq, NULL);
+
+	return err1 | err2;
+}

...