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Message-ID: <1714530132.167469-2-hengqi@linux.alibaba.com>
Date: Wed, 1 May 2024 10:22:12 +0800
From: Heng Qi <hengqi@...ux.alibaba.com>
To: Daniel Jurgens <danielj@...dia.com>
Cc: <mst@...hat.com>,
<jasowang@...hat.com>,
<xuanzhuo@...ux.alibaba.com>,
<virtualization@...ts.linux.dev>,
<davem@...emloft.net>,
<edumazet@...gle.com>,
<kuba@...nel.org>,
<pabeni@...hat.com>,
<jiri@...dia.com>,
Daniel Jurgens <danielj@...dia.com>,
<netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v5 2/6] virtio_net: Remove command data from control_buf
On Tue, 23 Apr 2024 06:57:42 +0300, Daniel Jurgens <danielj@...dia.com> wrote:
> Allocate memory for the data when it's used. Ideally the could be on the
> stack, but we can't DMA stack memory. With this change only the header
> and status memory are shared between commands, which will allow using a
> tighter lock than RTNL.
>
> Signed-off-by: Daniel Jurgens <danielj@...dia.com>
> Reviewed-by: Jiri Pirko <jiri@...dia.com>
> ---
> drivers/net/virtio_net.c | 111 ++++++++++++++++++++++++++-------------
> 1 file changed, 75 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 7248dae54e1c..0ee192b45e1e 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -240,14 +240,6 @@ struct virtio_net_ctrl_rss {
> struct control_buf {
> struct virtio_net_ctrl_hdr hdr;
> virtio_net_ctrl_ack status;
> - struct virtio_net_ctrl_mq mq;
> - u8 promisc;
> - u8 allmulti;
> - __virtio16 vid;
> - __virtio64 offloads;
> - struct virtio_net_ctrl_coal_tx coal_tx;
> - struct virtio_net_ctrl_coal_rx coal_rx;
> - struct virtio_net_ctrl_coal_vq coal_vq;
Since Xuan's device-stats series was merged before, please remember
to rebase the net-next branch in the next version.
Thanks!
> };
>
> struct virtnet_info {
> @@ -2672,14 +2664,19 @@ static void virtnet_ack_link_announce(struct virtnet_info *vi)
>
> static int _virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
> {
> + struct virtio_net_ctrl_mq *mq __free(kfree) = NULL;
> struct scatterlist sg;
> struct net_device *dev = vi->dev;
>
> if (!vi->has_cvq || !virtio_has_feature(vi->vdev, VIRTIO_NET_F_MQ))
> return 0;
>
> - vi->ctrl->mq.virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
> - sg_init_one(&sg, &vi->ctrl->mq, sizeof(vi->ctrl->mq));
> + mq = kzalloc(sizeof(*mq), GFP_KERNEL);
> + if (!mq)
> + return -ENOMEM;
> +
> + mq->virtqueue_pairs = cpu_to_virtio16(vi->vdev, queue_pairs);
> + sg_init_one(&sg, mq, sizeof(*mq));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
> VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &sg)) {
> @@ -2708,6 +2705,7 @@ static int virtnet_set_queues(struct virtnet_info *vi, u16 queue_pairs)
>
> static int virtnet_close(struct net_device *dev)
> {
> + u8 *promisc_allmulti __free(kfree) = NULL;
> struct virtnet_info *vi = netdev_priv(dev);
> int i;
>
> @@ -2732,6 +2730,7 @@ static void virtnet_rx_mode_work(struct work_struct *work)
> struct scatterlist sg[2];
> struct virtio_net_ctrl_mac *mac_data;
> struct netdev_hw_addr *ha;
> + u8 *promisc_allmulti;
> int uc_count;
> int mc_count;
> void *buf;
> @@ -2743,22 +2742,27 @@ static void virtnet_rx_mode_work(struct work_struct *work)
>
> rtnl_lock();
>
> - vi->ctrl->promisc = ((dev->flags & IFF_PROMISC) != 0);
> - vi->ctrl->allmulti = ((dev->flags & IFF_ALLMULTI) != 0);
> + promisc_allmulti = kzalloc(sizeof(*promisc_allmulti), GFP_ATOMIC);
> + if (!promisc_allmulti) {
> + dev_warn(&dev->dev, "Failed to set RX mode, no memory.\n");
> + return;
> + }
>
> - sg_init_one(sg, &vi->ctrl->promisc, sizeof(vi->ctrl->promisc));
> + *promisc_allmulti = !!(dev->flags & IFF_PROMISC);
> + sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
> VIRTIO_NET_CTRL_RX_PROMISC, sg))
> dev_warn(&dev->dev, "Failed to %sable promisc mode.\n",
> - vi->ctrl->promisc ? "en" : "dis");
> + *promisc_allmulti ? "en" : "dis");
>
> - sg_init_one(sg, &vi->ctrl->allmulti, sizeof(vi->ctrl->allmulti));
> + *promisc_allmulti = !!(dev->flags & IFF_ALLMULTI);
> + sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX,
> VIRTIO_NET_CTRL_RX_ALLMULTI, sg))
> dev_warn(&dev->dev, "Failed to %sable allmulti mode.\n",
> - vi->ctrl->allmulti ? "en" : "dis");
> + *promisc_allmulti ? "en" : "dis");
>
> netif_addr_lock_bh(dev);
>
> @@ -2819,10 +2823,15 @@ static int virtnet_vlan_rx_add_vid(struct net_device *dev,
> __be16 proto, u16 vid)
> {
> struct virtnet_info *vi = netdev_priv(dev);
> + __virtio16 *_vid __free(kfree) = NULL;
> struct scatterlist sg;
>
> - vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
> - sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
> + _vid = kzalloc(sizeof(*_vid), GFP_KERNEL);
> + if (!_vid)
> + return -ENOMEM;
> +
> + *_vid = cpu_to_virtio16(vi->vdev, vid);
> + sg_init_one(&sg, _vid, sizeof(*_vid));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
> VIRTIO_NET_CTRL_VLAN_ADD, &sg))
> @@ -2834,10 +2843,15 @@ static int virtnet_vlan_rx_kill_vid(struct net_device *dev,
> __be16 proto, u16 vid)
> {
> struct virtnet_info *vi = netdev_priv(dev);
> + __virtio16 *_vid __free(kfree) = NULL;
> struct scatterlist sg;
>
> - vi->ctrl->vid = cpu_to_virtio16(vi->vdev, vid);
> - sg_init_one(&sg, &vi->ctrl->vid, sizeof(vi->ctrl->vid));
> + _vid = kzalloc(sizeof(*_vid), GFP_KERNEL);
> + if (!_vid)
> + return -ENOMEM;
> +
> + *_vid = cpu_to_virtio16(vi->vdev, vid);
> + sg_init_one(&sg, _vid, sizeof(*_vid));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN,
> VIRTIO_NET_CTRL_VLAN_DEL, &sg))
> @@ -2950,12 +2964,17 @@ static void virtnet_cpu_notif_remove(struct virtnet_info *vi)
> static int virtnet_send_ctrl_coal_vq_cmd(struct virtnet_info *vi,
> u16 vqn, u32 max_usecs, u32 max_packets)
> {
> + struct virtio_net_ctrl_coal_vq *coal_vq __free(kfree) = NULL;
> struct scatterlist sgs;
>
> - vi->ctrl->coal_vq.vqn = cpu_to_le16(vqn);
> - vi->ctrl->coal_vq.coal.max_usecs = cpu_to_le32(max_usecs);
> - vi->ctrl->coal_vq.coal.max_packets = cpu_to_le32(max_packets);
> - sg_init_one(&sgs, &vi->ctrl->coal_vq, sizeof(vi->ctrl->coal_vq));
> + coal_vq = kzalloc(sizeof(*coal_vq), GFP_KERNEL);
> + if (!coal_vq)
> + return -ENOMEM;
> +
> + coal_vq->vqn = cpu_to_le16(vqn);
> + coal_vq->coal.max_usecs = cpu_to_le32(max_usecs);
> + coal_vq->coal.max_packets = cpu_to_le32(max_packets);
> + sg_init_one(&sgs, coal_vq, sizeof(*coal_vq));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
> VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET,
> @@ -3101,11 +3120,15 @@ static bool virtnet_commit_rss_command(struct virtnet_info *vi)
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_MQ,
> vi->has_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG
> - : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs)) {
> - dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
> - return false;
> - }
> + : VIRTIO_NET_CTRL_MQ_HASH_CONFIG, sgs))
> + goto err;
> +
> return true;
> +
> +err:
> + dev_warn(&dev->dev, "VIRTIONET issue with committing RSS sgs\n");
> + return false;
> +
> }
>
> static void virtnet_init_default_rss(struct virtnet_info *vi)
> @@ -3410,12 +3433,17 @@ 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)
> {
> + struct virtio_net_ctrl_coal_tx *coal_tx __free(kfree) = NULL;
> struct scatterlist sgs_tx;
> int i;
>
> - 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));
> + coal_tx = kzalloc(sizeof(*coal_tx), GFP_KERNEL);
> + if (!coal_tx)
> + return -ENOMEM;
> +
> + coal_tx->tx_usecs = cpu_to_le32(ec->tx_coalesce_usecs);
> + coal_tx->tx_max_packets = cpu_to_le32(ec->tx_max_coalesced_frames);
> + sg_init_one(&sgs_tx, coal_tx, sizeof(*coal_tx));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
> VIRTIO_NET_CTRL_NOTF_COAL_TX_SET,
> @@ -3435,6 +3463,7 @@ static int virtnet_send_tx_notf_coal_cmds(struct virtnet_info *vi,
> static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi,
> struct ethtool_coalesce *ec)
> {
> + struct virtio_net_ctrl_coal_rx *coal_rx __free(kfree) = NULL;
> bool rx_ctrl_dim_on = !!ec->use_adaptive_rx_coalesce;
> struct scatterlist sgs_rx;
> int i;
> @@ -3453,6 +3482,10 @@ static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi,
> return 0;
> }
>
> + coal_rx = kzalloc(sizeof(*coal_rx), GFP_KERNEL);
> + if (!coal_rx)
> + return -ENOMEM;
> +
> if (!rx_ctrl_dim_on && vi->rx_dim_enabled) {
> vi->rx_dim_enabled = false;
> for (i = 0; i < vi->max_queue_pairs; i++)
> @@ -3463,9 +3496,9 @@ static int virtnet_send_rx_notf_coal_cmds(struct virtnet_info *vi,
> * we need apply the global new params even if they
> * are not updated.
> */
> - vi->ctrl->coal_rx.rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs);
> - vi->ctrl->coal_rx.rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames);
> - sg_init_one(&sgs_rx, &vi->ctrl->coal_rx, sizeof(vi->ctrl->coal_rx));
> + coal_rx->rx_usecs = cpu_to_le32(ec->rx_coalesce_usecs);
> + coal_rx->rx_max_packets = cpu_to_le32(ec->rx_max_coalesced_frames);
> + sg_init_one(&sgs_rx, coal_rx, sizeof(*coal_rx));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
> VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
> @@ -3951,10 +3984,16 @@ static int virtnet_restore_up(struct virtio_device *vdev)
>
> static int virtnet_set_guest_offloads(struct virtnet_info *vi, u64 offloads)
> {
> + __virtio64 *_offloads __free(kfree) = NULL;
> struct scatterlist sg;
> - vi->ctrl->offloads = cpu_to_virtio64(vi->vdev, offloads);
>
> - sg_init_one(&sg, &vi->ctrl->offloads, sizeof(vi->ctrl->offloads));
> + _offloads = kzalloc(sizeof(*_offloads), GFP_KERNEL);
> + if (!_offloads)
> + return -ENOMEM;
> +
> + *_offloads = cpu_to_virtio64(vi->vdev, offloads);
> +
> + sg_init_one(&sg, _offloads, sizeof(*_offloads));
>
> if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_GUEST_OFFLOADS,
> VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, &sg)) {
> --
> 2.34.1
>
>
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