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Message-ID: <c15d3682-05ee-437c-b51c-d6a824252d76@nvidia.com>
Date: Thu, 29 Aug 2024 23:07:58 +0200
From: Dragos Tatulea <dtatulea@...dia.com>
To: Carlos Bilbao <carlos.bilbao.osdev@...il.com>, mst@...hat.com,
jasowang@...hat.com
Cc: bilbao@...edu, xuanzhuo@...ux.alibaba.com, eperezma@...hat.com,
cratiu@...dia.com, lingshan.zhu@...el.com, virtualization@...ts.linux.dev,
linux-kernel@...r.kernel.org, Carlos Bilbao <cbilbao@...italocean.com>
Subject: Re: [PATCH 2/2] vdpa: Add support to update speed/duplex in
vDPA/mlx5_vnet
(resending as I accidentally replied only to Carlos)
On 29.08.24 18:16, Carlos Bilbao wrote:
> From: Carlos Bilbao <cbilbao@...italocean.com>
>
> Include support to update the vDPA configuration fields of speed and
> duplex (as needed by VHOST_VDPA_SET_CONFIG). This includes function
> mlx5_vdpa_set_config() as well as changes in vdpa.c to fill the initial
> values to UNKNOWN. Also add a warning message for when
> mlx5_vdpa_get_config() receives offset and length out of bounds.
>
> Signed-off-by: Carlos Bilbao <cbilbao@...italocean.com>
> ---
> drivers/vdpa/mlx5/net/mlx5_vnet.c | 34 ++++++++++++++++++++++++++++++-
> drivers/vdpa/vdpa.c | 27 ++++++++++++++++++++++++
> include/uapi/linux/vdpa.h | 2 ++
> 3 files changed, 62 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> index c47009a8b472..a44bb2072eec 100644
> --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c
> +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c
> @@ -3221,12 +3221,44 @@ static void mlx5_vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
>
> if (offset + len <= sizeof(struct virtio_net_config))
> memcpy(buf, (u8 *)&ndev->config + offset, len);
> + else
> + mlx5_vdpa_warn(mvdev, "Offset and length out of bounds\n");
> }
>
> static void mlx5_vdpa_set_config(struct vdpa_device *vdev, unsigned int offset, const void *buf,
> unsigned int len)
> {
> - /* not supported */
> + struct mlx5_vdpa_dev *mvdev = to_mvdev(vdev);
> + struct mlx5_vdpa_net *ndev = to_mlx5_vdpa_ndev(mvdev);
> +
> + if (offset + len > sizeof(struct virtio_net_config)) {
> + mlx5_vdpa_warn(mvdev, "Offset and length out of bounds\n");
> + return;
> + }
> +
> + /*
> + * Note that this will update the speed/duplex configuration fields
> + * but the hardware support to actually perform this change does
> + * not exist yet.
> + */
> + switch (offset) {
> + case offsetof(struct virtio_net_config, speed):
> + if (len == sizeof(((struct virtio_net_config *) 0)->speed))
> + memcpy(&ndev->config.speed, buf, len);
> + else
> + mlx5_vdpa_warn(mvdev, "Invalid length for speed.\n");
> + break;
> +
> + case offsetof(struct virtio_net_config, duplex):
> + if (len == sizeof(((struct virtio_net_config *)0)->duplex))
> + memcpy(&ndev->config.duplex, buf, len);
> + else
> + mlx5_vdpa_warn(mvdev, "Invalid length for duplex.\n");
> + break;
> +
> + default:
> + mlx5_vdpa_warn(mvdev, "Configuration field not supported.\n");
This will trigger noise in dmesg because there is a MAC configuration here.
> + }
I would prefer that the .set_config remains a stub TBH. Setting the fields here is
misleading: the user might deduce that the configuration worked when they read the
values and see that they were updated.
Thanks,
dragos
> }
>
> static u32 mlx5_vdpa_get_generation(struct vdpa_device *vdev)
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index 4dbd2e55a288..b920e4405f6d 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -15,6 +15,7 @@
> #include <net/genetlink.h>
> #include <linux/mod_devicetable.h>
> #include <linux/virtio_ids.h>
> +#include <uapi/linux/ethtool.h>
>
> static LIST_HEAD(mdev_head);
> /* A global mutex that protects vdpa management device and device level operations. */
> @@ -919,6 +920,22 @@ static int vdpa_dev_net_status_config_fill(struct sk_buff *msg, u64 features,
> return nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16);
> }
>
> +static int vdpa_dev_net_speed_config_fill(struct sk_buff *msg, u64 features,
> + struct virtio_net_config *config)
> +{
> + __le32 speed = cpu_to_le32(SPEED_UNKNOWN);
> +
> + return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_SPEED, sizeof(speed), &speed);
> +}
> +
> +static int vdpa_dev_net_duplex_config_fill(struct sk_buff *msg, u64 features,
> + struct virtio_net_config *config)
> +{
> + u8 duplex = DUPLEX_UNKNOWN;
> +
> + return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_DUPLEX, sizeof(duplex), &duplex);
> +}
> +
> static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *msg)
> {
> struct virtio_net_config config = {};
> @@ -940,6 +957,16 @@ static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff *ms
>
> if (vdpa_dev_net_status_config_fill(msg, features_device, &config))
> return -EMSGSIZE;
> + /*
> + * mlx5_vdpa vDPA devicess currently do not support the
> + * VIRTIO_NET_F_SPEED_DUPLEX feature, which reports speed and
> + * duplex; hence these are set to UNKNOWN for now.
> + */
> + if (vdpa_dev_net_speed_config_fill(msg, features_device, &config))
> + return -EMSGSIZE;
> +
> + if (vdpa_dev_net_duplex_config_fill(msg, features_device, &config))
> + return -EMSGSIZE;
>
> return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
> }
> diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
> index 842bf1201ac4..1c64ee0dd7b1 100644
> --- a/include/uapi/linux/vdpa.h
> +++ b/include/uapi/linux/vdpa.h
> @@ -43,6 +43,8 @@ enum vdpa_attr {
> VDPA_ATTR_DEV_NET_STATUS, /* u8 */
> VDPA_ATTR_DEV_NET_CFG_MAX_VQP, /* u16 */
> VDPA_ATTR_DEV_NET_CFG_MTU, /* u16 */
> + VDPA_ATTR_DEV_NET_CFG_SPEED, /* u32 */
> + VDPA_ATTR_DEV_NET_CFG_DUPLEX, /* u8 */
>
> VDPA_ATTR_DEV_NEGOTIATED_FEATURES, /* u64 */
> VDPA_ATTR_DEV_MGMTDEV_MAX_VQS, /* u32 */
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