[PATCH v5 22/22] virtio_net: support set_ringparam

From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
To: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
	Jason Wang <jasowang@redhat.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	John Fastabend <john.fastabend@gmail.com>,
	bpf@vger.kernel.org
Subject: [PATCH v5 22/22] virtio_net: support set_ringparam
Date: Mon, 14 Feb 2022 16:14:16 +0800	[thread overview]
Message-ID: <20220214081416.117695-23-xuanzhuo@linux.alibaba.com> (raw)
In-Reply-To: <20220214081416.117695-1-xuanzhuo@linux.alibaba.com>

Support set_ringparam based on virtio queue reset.

The rx,tx_pending required to be passed must be power of 2.

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
---
 drivers/net/virtio_net.c | 50 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f9bb760c6dbd..bf460ea87354 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2308,6 +2308,55 @@ static void virtnet_get_ringparam(struct net_device *dev,
 	ring->tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
 }
 
+static int virtnet_set_ringparam(struct net_device *dev,
+				 struct ethtool_ringparam *ring,
+				 struct kernel_ethtool_ringparam *kernel_ring,
+				 struct netlink_ext_ack *extack)
+{
+	struct virtnet_info *vi = netdev_priv(dev);
+	u32 rx_pending, tx_pending;
+	int i, err;
+
+	if (ring->rx_mini_pending || ring->rx_jumbo_pending)
+		return -EINVAL;
+
+	rx_pending = virtqueue_get_vring_size(vi->rq[0].vq);
+	tx_pending = virtqueue_get_vring_size(vi->sq[0].vq);
+
+	if (ring->rx_pending == rx_pending &&
+	    ring->tx_pending == tx_pending)
+		return 0;
+
+	if (ring->rx_pending > virtqueue_get_vring_max_size(vi->rq[0].vq))
+		return -EINVAL;
+
+	if (ring->tx_pending > virtqueue_get_vring_max_size(vi->sq[0].vq))
+		return -EINVAL;
+
+	if (!is_power_of_2(ring->rx_pending))
+		return -EINVAL;
+
+	if (!is_power_of_2(ring->tx_pending))
+		return -EINVAL;
+
+	for (i = 0; i < vi->max_queue_pairs; i++) {
+		if (ring->tx_pending != tx_pending) {
+			virtio_set_max_ring_num(vi->vdev, ring->tx_pending);
+			err = virtnet_tx_vq_reset(vi, i);
+			if (err)
+				return err;
+		}
+
+		if (ring->rx_pending != rx_pending) {
+			virtio_set_max_ring_num(vi->vdev, ring->rx_pending);
+			err = virtnet_rx_vq_reset(vi, i);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
+}
 
 static void virtnet_get_drvinfo(struct net_device *dev,
 				struct ethtool_drvinfo *info)
@@ -2541,6 +2590,7 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
 	.get_drvinfo = virtnet_get_drvinfo,
 	.get_link = ethtool_op_get_link,
 	.get_ringparam = virtnet_get_ringparam,
+	.set_ringparam = virtnet_set_ringparam,
 	.get_strings = virtnet_get_strings,
 	.get_sset_count = virtnet_get_sset_count,
 	.get_ethtool_stats = virtnet_get_ethtool_stats,
-- 
2.31.0

