On Fri, Sep 9, 2022 at 5:05 PM Zhu Lingshan <lingshan....@intel.com> wrote:
>
> The spec says:
> mtu only exists if VIRTIO_NET_F_MTU is set
> The mac address field always exists (though
> is only valid if VIRTIO_NET_F_MAC is set)
>
> So vdpa_dev_net_config_fill() should read MTU and MAC
> conditionally on the feature bits.
>
> Signed-off-by: Zhu Lingshan <lingshan....@intel.com>
Acked-by: Jason Wang <jasow...@redhat.com>
> ---
> drivers/vdpa/vdpa.c | 37 +++++++++++++++++++++++++++++--------
> 1 file changed, 29 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
> index f8ff61232421..b332388d3375 100644
> --- a/drivers/vdpa/vdpa.c
> +++ b/drivers/vdpa/vdpa.c
> @@ -815,6 +815,29 @@ static int vdpa_dev_net_mq_config_fill(struct sk_buff
> *msg, u64 features,
> return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MAX_VQP, val_u16);
> }
>
> +static int vdpa_dev_net_mtu_config_fill(struct sk_buff *msg, u64 features,
> + const struct virtio_net_config
> *config)
> +{
> + u16 val_u16;
> +
> + if ((features & BIT_ULL(VIRTIO_NET_F_MTU)) == 0)
> + return 0;
> +
> + val_u16 = __virtio16_to_cpu(true, config->mtu);
> +
> + return nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16);
> +}
> +
> +static int vdpa_dev_net_mac_config_fill(struct sk_buff *msg, u64 features,
> + const struct virtio_net_config
> *config)
> +{
> + if ((features & BIT_ULL(VIRTIO_NET_F_MAC)) == 0)
> + return 0;
> +
> + return nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR,
> + sizeof(config->mac), config->mac);
> +}
> +
> static int vdpa_dev_net_config_fill(struct vdpa_device *vdev, struct sk_buff
> *msg)
> {
> struct virtio_net_config config = {};
> @@ -824,18 +847,10 @@ static int vdpa_dev_net_config_fill(struct vdpa_device
> *vdev, struct sk_buff *ms
>
> vdev->config->get_config(vdev, 0, &config, sizeof(config));
>
> - if (nla_put(msg, VDPA_ATTR_DEV_NET_CFG_MACADDR, sizeof(config.mac),
> - config.mac))
> - return -EMSGSIZE;
> -
> val_u16 = __virtio16_to_cpu(true, config.status);
> if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_STATUS, val_u16))
> return -EMSGSIZE;
>
> - val_u16 = __virtio16_to_cpu(true, config.mtu);
> - if (nla_put_u16(msg, VDPA_ATTR_DEV_NET_CFG_MTU, val_u16))
> - return -EMSGSIZE;
> -
> /* only read driver features after the feature negotiation is done */
> status = vdev->config->get_status(vdev);
> if (status & VIRTIO_CONFIG_S_FEATURES_OK) {
> @@ -852,6 +867,12 @@ static int vdpa_dev_net_config_fill(struct vdpa_device
> *vdev, struct sk_buff *ms
> VDPA_ATTR_PAD))
> return -EMSGSIZE;
>
> + if (vdpa_dev_net_mtu_config_fill(msg, features_device, &config))
> + return -EMSGSIZE;
> +
> + if (vdpa_dev_net_mac_config_fill(msg, features_device, &config))
> + return -EMSGSIZE;
> +
> return vdpa_dev_net_mq_config_fill(msg, features_device, &config);
> }
>
> --
> 2.31.1
>
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