[PATCH net] virtio_net: use control_buf for coalesce params

[PATCH net] virtio_net: use control_buf for coalesce params

[Brett Creeley]

Commit 699b045a8e43 ("net: virtio_net: notifications coalescing
support") added coalescing command support for virtio_net. However,
the coalesce commands are using buffers on the stack, which is causing
the device to see DMA errors. There should also be a complaint from
check_for_stack() in debug_dma_map_xyz(). Fix this by adding and using
coalesce params from the control_buf struct, which aligns with other
commands.

Fixes: 699b045a8e43 ("net: virtio_net: notifications coalescing support")
Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
Signed-off-by: Brett Creeley <brett.creeley@amd.com>
---
 drivers/net/virtio_net.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 56ca1d270304..486b5849033d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -205,6 +205,8 @@ struct control_buf {
 	__virtio16 vid;
 	__virtio64 offloads;
 	struct virtio_net_ctrl_rss rss;
+	struct virtio_net_ctrl_coal_tx coal_tx;
+	struct virtio_net_ctrl_coal_rx coal_rx;
 };
 
 struct virtnet_info {
@@ -2934,12 +2936,10 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
 				       struct ethtool_coalesce *ec)
 {
 	struct scatterlist sgs_tx, sgs_rx;
-	struct virtio_net_ctrl_coal_tx coal_tx;
-	struct virtio_net_ctrl_coal_rx coal_rx;
 
-	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));
+	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,
@@ -2950,9 +2950,9 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
 	vi->tx_usecs = ec->tx_coalesce_usecs;
 	vi->tx_max_packets = ec->tx_max_coalesced_frames;
 
-	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));
+	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));
 
 	if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
 				  VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
-- 
2.17.1

Re: [PATCH net] virtio_net: use control_buf for coalesce params

[Jason Wang]

On Tue, Jun 6, 2023 at 3:59 AM Brett Creeley <brett.creeley@amd.com> wrote:
>
> Commit 699b045a8e43 ("net: virtio_net: notifications coalescing
> support") added coalescing command support for virtio_net. However,
> the coalesce commands are using buffers on the stack, which is causing
> the device to see DMA errors. There should also be a complaint from
> check_for_stack() in debug_dma_map_xyz(). Fix this by adding and using
> coalesce params from the control_buf struct, which aligns with other
> commands.
>
> Fixes: 699b045a8e43 ("net: virtio_net: notifications coalescing support")
> Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
> Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
> Signed-off-by: Brett Creeley <brett.creeley@amd.com>
> ---
>  drivers/net/virtio_net.c | 16 ++++++++--------

The patch is needed for -stable I think.

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks

>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 56ca1d270304..486b5849033d 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -205,6 +205,8 @@ struct control_buf {
>         __virtio16 vid;
>         __virtio64 offloads;
>         struct virtio_net_ctrl_rss rss;
> +       struct virtio_net_ctrl_coal_tx coal_tx;
> +       struct virtio_net_ctrl_coal_rx coal_rx;
>  };
>
>  struct virtnet_info {
> @@ -2934,12 +2936,10 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
>                                        struct ethtool_coalesce *ec)
>  {
>         struct scatterlist sgs_tx, sgs_rx;
> -       struct virtio_net_ctrl_coal_tx coal_tx;
> -       struct virtio_net_ctrl_coal_rx coal_rx;
>
> -       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));
> +       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,
> @@ -2950,9 +2950,9 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
>         vi->tx_usecs = ec->tx_coalesce_usecs;
>         vi->tx_max_packets = ec->tx_max_coalesced_frames;
>
> -       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));
> +       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));
>
>         if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
>                                   VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
> --
> 2.17.1
>

Re: [PATCH net] virtio_net: use control_buf for coalesce params

[Xuan Zhuo]

On Mon, 5 Jun 2023 12:59:25 -0700, Brett Creeley <brett.creeley@amd.com> wrote:
> Commit 699b045a8e43 ("net: virtio_net: notifications coalescing
> support") added coalescing command support for virtio_net. However,
> the coalesce commands are using buffers on the stack, which is causing
> the device to see DMA errors. There should also be a complaint from
> check_for_stack() in debug_dma_map_xyz(). Fix this by adding and using
> coalesce params from the control_buf struct, which aligns with other
> commands.
>
> Fixes: 699b045a8e43 ("net: virtio_net: notifications coalescing support")
> Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
> Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
> Signed-off-by: Brett Creeley <brett.creeley@amd.com>

Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>

Thanks.

> ---
>  drivers/net/virtio_net.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 56ca1d270304..486b5849033d 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -205,6 +205,8 @@ struct control_buf {
>  	__virtio16 vid;
>  	__virtio64 offloads;
>  	struct virtio_net_ctrl_rss rss;
> +	struct virtio_net_ctrl_coal_tx coal_tx;
> +	struct virtio_net_ctrl_coal_rx coal_rx;
>  };
>
>  struct virtnet_info {
> @@ -2934,12 +2936,10 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
>  				       struct ethtool_coalesce *ec)
>  {
>  	struct scatterlist sgs_tx, sgs_rx;
> -	struct virtio_net_ctrl_coal_tx coal_tx;
> -	struct virtio_net_ctrl_coal_rx coal_rx;
>
> -	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));
> +	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,
> @@ -2950,9 +2950,9 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
>  	vi->tx_usecs = ec->tx_coalesce_usecs;
>  	vi->tx_max_packets = ec->tx_max_coalesced_frames;
>
> -	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));
> +	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));
>
>  	if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
>  				  VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
> --
> 2.17.1
>

Re: [PATCH net] virtio_net: use control_buf for coalesce params

[Michael S. Tsirkin]

On Mon, Jun 05, 2023 at 12:59:25PM -0700, Brett Creeley wrote:
> Commit 699b045a8e43 ("net: virtio_net: notifications coalescing
> support") added coalescing command support for virtio_net. However,
> the coalesce commands are using buffers on the stack, which is causing
> the device to see DMA errors. There should also be a complaint from
> check_for_stack() in debug_dma_map_xyz(). Fix this by adding and using
> coalesce params from the control_buf struct, which aligns with other
> commands.
> 
> Fixes: 699b045a8e43 ("net: virtio_net: notifications coalescing support")
> Reviewed-by: Shannon Nelson <shannon.nelson@amd.com>
> Signed-off-by: Allen Hubbe <allen.hubbe@amd.com>
> Signed-off-by: Brett Creeley <brett.creeley@amd.com>


Acked-by: Michael S. Tsirkin <mst@redhat.com>

stable material too.

> ---
>  drivers/net/virtio_net.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 56ca1d270304..486b5849033d 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -205,6 +205,8 @@ struct control_buf {
>  	__virtio16 vid;
>  	__virtio64 offloads;
>  	struct virtio_net_ctrl_rss rss;
> +	struct virtio_net_ctrl_coal_tx coal_tx;
> +	struct virtio_net_ctrl_coal_rx coal_rx;
>  };
>  
>  struct virtnet_info {
> @@ -2934,12 +2936,10 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
>  				       struct ethtool_coalesce *ec)
>  {
>  	struct scatterlist sgs_tx, sgs_rx;
> -	struct virtio_net_ctrl_coal_tx coal_tx;
> -	struct virtio_net_ctrl_coal_rx coal_rx;
>  
> -	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));
> +	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,
> @@ -2950,9 +2950,9 @@ static int virtnet_send_notf_coal_cmds(struct virtnet_info *vi,
>  	vi->tx_usecs = ec->tx_coalesce_usecs;
>  	vi->tx_max_packets = ec->tx_max_coalesced_frames;
>  
> -	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));
> +	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));
>  
>  	if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_NOTF_COAL,
>  				  VIRTIO_NET_CTRL_NOTF_COAL_RX_SET,
> -- 
> 2.17.1

Re: [PATCH net] virtio_net: use control_buf for coalesce params

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Mon, 5 Jun 2023 12:59:25 -0700 you wrote:
> Commit 699b045a8e43 ("net: virtio_net: notifications coalescing
> support") added coalescing command support for virtio_net. However,
> the coalesce commands are using buffers on the stack, which is causing
> the device to see DMA errors. There should also be a complaint from
> check_for_stack() in debug_dma_map_xyz(). Fix this by adding and using
> coalesce params from the control_buf struct, which aligns with other
> commands.
> 
> [...]

Here is the summary with links:
  - [net] virtio_net: use control_buf for coalesce params
    https://git.kernel.org/netdev/net/c/accc1bf23068

You are awesome, thank you!
-- 
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