This patch enables the interrupt coalescing setting through ethtool.
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/net/virtio_net.c | 62 ++++++++++++++++++++++++++++++++++++++++
drivers/virtio/virtio_ring.c | 2 ++
include/uapi/linux/virtio_ring.h | 1 +
3 files changed, 65 insertions(+)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 744f0b1..4ad739f 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -140,6 +140,14 @@ struct virtnet_info {
/* CPU hot plug notifier */
struct notifier_block nb;
+
+ /* Budget for polling tx completion */
+ u32 tx_work_limit;
+
+ __u32 rx_coalesce_usecs;
+ __u32 rx_max_coalesced_frames;
+ __u32 tx_coalesce_usecs;
+ __u32 tx_max_coalesced_frames;
};
struct padded_vnet_hdr {
@@ -1384,6 +1392,58 @@ static void virtnet_get_channels(struct net_device *dev,
channels->other_count = 0;
}
+static int virtnet_set_coalesce(struct net_device *dev,
+ struct ethtool_coalesce *ec)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+ int i;
+
+ if (!vi->vdev->config->set_coalesce) {
+ dev_warn(&dev->dev, "Transport does not support coalescing.\n");
+ return -EINVAL;
+ }
+
+ if (vi->rx_coalesce_usecs != ec->rx_coalesce_usecs ||
+ vi->rx_max_coalesced_frames != ec->rx_max_coalesced_frames) {
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ vi->vdev->config->set_coalesce(vi->vdev, rxq2vq(i),
+ ec->rx_max_coalesced_frames,
+ ec->rx_coalesce_usecs);
+ }
+ vi->rx_coalesce_usecs = ec->rx_coalesce_usecs;
+ vi->rx_max_coalesced_frames = ec->rx_max_coalesced_frames;
+ }
+
+ if (vi->tx_coalesce_usecs != ec->tx_coalesce_usecs ||
+ vi->tx_max_coalesced_frames != ec->tx_max_coalesced_frames) {
+ for (i = 0; i < vi->max_queue_pairs; i++) {
+ vi->vdev->config->set_coalesce(vi->vdev, txq2vq(i),
+ ec->tx_max_coalesced_frames,
+ ec->tx_coalesce_usecs);
+ }
+ vi->tx_coalesce_usecs = ec->tx_coalesce_usecs;
+ vi->tx_max_coalesced_frames = ec->tx_max_coalesced_frames;
+ }
+
+ vi->tx_work_limit = ec->tx_max_coalesced_frames_irq;
+
+ return 0;
+}
+
+static int virtnet_get_coalesce(struct net_device *dev,
+ struct ethtool_coalesce *ec)
+{
+ struct virtnet_info *vi = netdev_priv(dev);
+
+ ec->rx_coalesce_usecs = vi->rx_coalesce_usecs;
+ ec->rx_max_coalesced_frames = vi->rx_max_coalesced_frames;
+ ec->tx_coalesce_usecs = vi->tx_coalesce_usecs;
+ ec->tx_max_coalesced_frames = vi->tx_max_coalesced_frames;
+ ec->tx_max_coalesced_frames_irq = vi->tx_work_limit;
+
+ return 0;
+}
+
static const struct ethtool_ops virtnet_ethtool_ops = {
.get_drvinfo = virtnet_get_drvinfo,
.get_link = ethtool_op_get_link,
@@ -1391,6 +1451,8 @@ static const struct ethtool_ops virtnet_ethtool_ops = {
.set_channels = virtnet_set_channels,
.get_channels = virtnet_get_channels,
.get_ts_info = ethtool_op_get_ts_info,
+ .set_coalesce = virtnet_set_coalesce,
+ .get_coalesce = virtnet_get_coalesce,
};
#define MIN_MTU 68
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index a83aebc..a2cdbe3 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -780,6 +780,8 @@ void vring_transport_features(struct virtio_device *vdev)
break;
case VIRTIO_RING_F_EVENT_IDX:
break;
+ case VIRTIO_RING_F_INTR_COALESCING:
+ break;
case VIRTIO_F_VERSION_1:
break;
default:
diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index 915980a..e9756d8 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -58,6 +58,7 @@
/* The Host publishes the avail index for which it expects a kick
* at the end of the used ring. Guest should ignore the used->flags field. */
#define VIRTIO_RING_F_EVENT_IDX 29
+#define VIRTIO_RING_F_INTR_COALESCING 31
/* Virtio ring descriptors: 16 bytes. These can chain together via "next". */
struct vring_desc {
--
1.8.3.1
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