add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/net/virtio_net.c
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@@ -646,8 +646,13 @@
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 				       int page_off,
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 				       unsigned int *len)
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 {
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-	struct page *page = alloc_page(GFP_ATOMIC);
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+	int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
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+	struct page *page;
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+	if (page_off + *len + tailroom > PAGE_SIZE)
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+		return NULL;
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+
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+	page = alloc_page(GFP_ATOMIC);
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 	if (!page)
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 		return NULL;
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@@ -655,7 +660,6 @@
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 	page_off += *len;
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 	while (--*num_buf) {
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-		int tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
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 		unsigned int buflen;
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 		void *buf;
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 		int off;
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@@ -1525,12 +1529,12 @@
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 	received = virtnet_receive(rq, budget, &xdp_xmit);
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+	if (xdp_xmit & VIRTIO_XDP_REDIR)
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+		xdp_do_flush();
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+
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 	/* Out of packets? */
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 	if (received < budget)
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 		virtqueue_napi_complete(napi, rq->vq, received);
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-
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-	if (xdp_xmit & VIRTIO_XDP_REDIR)
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-		xdp_do_flush();
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 	if (xdp_xmit & VIRTIO_XDP_TX) {
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 		sq = virtnet_xdp_get_sq(vi);
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@@ -1928,8 +1932,8 @@
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 	cancel_delayed_work_sync(&vi->refill);
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 	for (i = 0; i < vi->max_queue_pairs; i++) {
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-		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
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 		napi_disable(&vi->rq[i].napi);
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+		xdp_rxq_info_unreg(&vi->rq[i].xdp_rxq);
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 		virtnet_napi_tx_disable(&vi->sq[i].napi);
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 	}
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..
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@@ -2746,6 +2750,27 @@
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 			put_page(vi->rq[i].alloc_frag.page);
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 }
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+static void virtnet_sq_free_unused_buf(struct virtqueue *vq, void *buf)
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+{
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+	if (!is_xdp_frame(buf))
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+		dev_kfree_skb(buf);
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+	else
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+		xdp_return_frame(ptr_to_xdp(buf));
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+}
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+
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+static void virtnet_rq_free_unused_buf(struct virtqueue *vq, void *buf)
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+{
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+	struct virtnet_info *vi = vq->vdev->priv;
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+	int i = vq2rxq(vq);
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+
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+	if (vi->mergeable_rx_bufs)
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+		put_page(virt_to_head_page(buf));
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+	else if (vi->big_packets)
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+		give_pages(&vi->rq[i], buf);
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+	else
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+		put_page(virt_to_head_page(buf));
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+}
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+
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 static void free_unused_bufs(struct virtnet_info *vi)
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 {
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 	void *buf;
..
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@@ -2753,26 +2778,16 @@
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 	for (i = 0; i < vi->max_queue_pairs; i++) {
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 		struct virtqueue *vq = vi->sq[i].vq;
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-		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
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-			if (!is_xdp_frame(buf))
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-				dev_kfree_skb(buf);
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-			else
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-				xdp_return_frame(ptr_to_xdp(buf));
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-		}
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+		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
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+			virtnet_sq_free_unused_buf(vq, buf);
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+		cond_resched();
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 	}
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 	for (i = 0; i < vi->max_queue_pairs; i++) {
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 		struct virtqueue *vq = vi->rq[i].vq;
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-
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-		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL) {
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-			if (vi->mergeable_rx_bufs) {
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-				put_page(virt_to_head_page(buf));
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-			} else if (vi->big_packets) {
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-				give_pages(&vi->rq[i], buf);
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-			} else {
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-				put_page(virt_to_head_page(buf));
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-			}
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-		}
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+		while ((buf = virtqueue_detach_unused_buf(vq)) != NULL)
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+			virtnet_rq_free_unused_buf(vq, buf);
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+		cond_resched();
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 	}
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 }
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..
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@@ -3220,6 +3235,8 @@
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 	virtio_device_ready(vdev);
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+	_virtnet_set_queues(vi, vi->curr_queue_pairs);
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+
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 	rtnl_unlock();
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 	err = virtnet_cpu_notif_add(vi);
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@@ -3227,8 +3244,6 @@
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 		pr_debug("virtio_net: registering cpu notifier failed\n");
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 		goto free_unregister_netdev;
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 	}
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-
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-	virtnet_set_queues(vi, vi->curr_queue_pairs);
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 	/* Assume link up if device can't report link status,
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 	   otherwise get link status from config. */