lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
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
> 
> 

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ