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Date: Tue, 1 Aug 2023 16:22:34 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: "Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
netdev@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: [RFC PATCH 5/6] virtio-net: support tx netdim
Similar to rx netdim, this patch supports adaptive tx
coalescing moderation for the virtio-net driver.
Signed-off-by: Heng Qi <hengqi@...ux.alibaba.com>
---
drivers/net/virtio_net.c | 99 ++++++++++++++++++++++++++++++++++------
1 file changed, 85 insertions(+), 14 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 069e68a52598..d8e66460e37d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -145,8 +145,14 @@ struct send_queue {
struct virtnet_sq_stats stats;
+ /* The number of tx notifications */
+ u16 calls;
+
struct virtnet_interrupt_coalesce intr_coal;
+ /* Dynamic Iterrupt Moderation */
+ struct dim dim;
+
struct napi_struct napi;
/* Record whether sq is in reset state. */
@@ -299,6 +305,7 @@ struct virtnet_info {
/* Is dynamic interrupt moderation enabled? */
bool rx_dim_enabled;
+ bool tx_dim_enabled;
/* Interrupt coalescing settings */
struct virtnet_interrupt_coalesce intr_coal_tx;
@@ -435,19 +442,40 @@ static bool virtqueue_napi_complete(struct napi_struct *napi,
return false;
}
+static void virtnet_tx_dim_work(struct work_struct *work);
+
+static void virtnet_tx_dim_update(struct virtnet_info *vi, struct send_queue *sq)
+{
+ struct virtnet_sq_stats *stats = &sq->stats;
+ struct dim_sample cur_sample = {};
+
+ u64_stats_update_begin(&sq->stats.syncp);
+ dim_update_sample(sq->calls, stats->packets,
+ stats->bytes, &cur_sample);
+ u64_stats_update_end(&sq->stats.syncp);
+
+ net_dim(&sq->dim, cur_sample);
+}
+
static void skb_xmit_done(struct virtqueue *vq)
{
struct virtnet_info *vi = vq->vdev->priv;
- struct napi_struct *napi = &vi->sq[vq2txq(vq)].napi;
+ struct send_queue *sq = &vi->sq[vq2txq(vq)];
+ struct napi_struct *napi = &sq->napi;
+
+ sq->calls++;
/* Suppress further interrupts. */
virtqueue_disable_cb(vq);
- if (napi->weight)
+ if (napi->weight) {
virtqueue_napi_schedule(napi, vq);
- else
+ } else {
+ if (vi->tx_dim_enabled)
+ virtnet_tx_dim_update(vi, sq);
/* We were probably waiting for more output buffers. */
netif_wake_subqueue(vi->dev, vq2txq(vq));
+ }
}
#define MRG_CTX_HEADER_SHIFT 22
@@ -2027,6 +2055,7 @@ static void virtnet_disable_queue_pair(struct virtnet_info *vi, int qp_index)
napi_disable(&vi->rq[qp_index].napi);
xdp_rxq_info_unreg(&vi->rq[qp_index].xdp_rxq);
cancel_work_sync(&vi->rq[qp_index].dim.work);
+ cancel_work_sync(&vi->sq[qp_index].dim.work);
}
static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
@@ -2046,6 +2075,8 @@ static int virtnet_enable_queue_pair(struct virtnet_info *vi, int qp_index)
INIT_WORK(&vi->rq[qp_index].dim.work, virtnet_rx_dim_work);
vi->rq[qp_index].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
+ INIT_WORK(&vi->sq[qp_index].dim.work, virtnet_tx_dim_work);
+ vi->sq[qp_index].dim.mode = DIM_CQ_PERIOD_MODE_START_FROM_EQE;
virtnet_napi_enable(vi->rq[qp_index].vq, &vi->rq[qp_index].napi);
virtnet_napi_tx_enable(vi, vi->sq[qp_index].vq, &vi->sq[qp_index].napi);
@@ -2126,6 +2157,9 @@ static int virtnet_poll_tx(struct napi_struct *napi, int budget)
__netif_tx_unlock(txq);
__napi_schedule(napi);
}
+ } else {
+ if (vi->tx_dim_enabled)
+ virtnet_tx_dim_update(vi, sq);
}
}
@@ -3090,20 +3124,33 @@ static int virtnet_get_link_ksettings(struct net_device *dev,
static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
struct ethtool_coalesce *ec)
{
+ bool tx_ctrl_dim_on = !!ec->use_adaptive_tx_coalesce;
struct scatterlist sgs_tx;
- vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
- vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
- sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx));
-
- if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
- VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
- &sgs_tx))
+ if (tx_ctrl_dim_on && (ec->tx_coalesce_usecs != vi->intr_coal_tx.max_usecs ||
+ ec->tx_max_coalesced_frames != vi->intr_coal_tx.max_packets))
return -EINVAL;
- /* Save parameters */
- vi->intr_coal_tx.max_usecs = ec->tx_coalesce_usecs;
- vi->intr_coal_tx.max_packets = ec->tx_max_coalesced_frames;
+ if (tx_ctrl_dim_on) {
+ if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_VQ_NOTF_COAL))
+ vi->tx_dim_enabled = true;
+ else
+ return -EOPNOTSUPP;
+ } else if (!tx_ctrl_dim_on) {
+ vi->tx_dim_enabled = false;
+ vi->ctrl->coal_tx.tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
+ vi->ctrl->coal_tx.tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
+ sg_init_one(&sgs_tx, &vi->ctrl->coal_tx, sizeof(vi->ctrl->coal_tx));
+
+ if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
+ VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
+ &sgs_tx))
+ return -EINVAL;
+
+ /* Save parameters */
+ vi->intr_coal_tx.max_usecs = ec->tx_coalesce_usecs;
+ vi->intr_coal_tx.max_packets = ec->tx_max_coalesced_frames;
+ }
return 0;
}
@@ -3194,6 +3241,27 @@ static int virtnet_send_tx_notf_coal_vq_cmd(struct virtnet_info *vi,
return 0;
}
+static void virtnet_tx_dim_work(struct work_struct *work)
+{
+ struct dim *dim = container_of(work, struct dim, work);
+ struct send_queue *sq = container_of(dim,
+ struct send_queue, dim);
+ struct virtnet_info *vi = sq->vq->vdev->priv;
+ struct net_device *dev = vi->dev;
+ struct dim_cq_moder update_moder;
+ int qnum = sq - vi->sq, err;
+
+ update_moder = net_dim_get_tx_moderation(dim->mode, dim->profile_ix);
+ err = virtnet_send_tx_notf_coal_vq_cmd(vi, qnum,
+ update_moder.usec,
+ update_moder.pkts);
+ if (err)
+ pr_debug("%s: Failed to send dim parameters on txq%d\n",
+ dev->name, (int)(sq - vi->sq));
+
+ dim->state = DIM_START_MEASURE;
+}
+
static int virtnet_send_rx_notf_coal_vq_cmd(struct virtnet_info *vi,
u16 queue, u32 max_usecs,
u32 max_packets)
@@ -3230,6 +3298,9 @@ static int virtnet_send_notf_coal_vq_cmds(struct virtnet_info *vi,
}
if (ec->tx_coalesce_usecs || ec->tx_max_coalesced_frames) {
+ if (vi->tx_dim_enabled)
+ return -EBUSY;
+
err = virtnet_send_tx_notf_coal_vq_cmd(vi, queue,
ec->tx_coalesce_usecs,
ec->tx_max_coalesced_frames);
@@ -3524,7 +3595,7 @@ static int virtnet_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info)
static const struct ethtool_ops virtnet_ethtool_ops = {
.supported_coalesce_params = ETHTOOL_COALESCE_MAX_FRAMES |
- ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE_RX,
+ ETHTOOL_COALESCE_USECS | ETHTOOL_COALESCE_USE_ADAPTIVE,
.get_drvinfo = virtnet_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_ringparam = virtnet_get_ringparam,
--
2.19.1.6.gb485710b
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