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    Subject[PATCH V2 1/3] vdpa: device feature provisioning
    Date
    This patch allows the device features to be provisioned through
    netlink. A new attribute is introduced to allow the userspace to pass
    a 64bit device features during device adding.

    This provides several advantages:

    - Allow to provision a subset of the features to ease the cross vendor
    live migration.
    - Better debug-ability for vDPA framework and parent.

    Reviewed-by: Eli Cohen <elic@nvidia.com>
    Signed-off-by: Jason Wang <jasowang@redhat.com>
    ---
    drivers/vdpa/vdpa.c | 5 +++++
    include/linux/vdpa.h | 1 +
    include/uapi/linux/vdpa.h | 2 ++
    3 files changed, 8 insertions(+)

    diff --git a/drivers/vdpa/vdpa.c b/drivers/vdpa/vdpa.c
    index c06c02704461..278e26bfa492 100644
    --- a/drivers/vdpa/vdpa.c
    +++ b/drivers/vdpa/vdpa.c
    @@ -600,6 +600,11 @@ static int vdpa_nl_cmd_dev_add_set_doit(struct sk_buff *skb, struct genl_info *i
    }
    config.mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
    }
    + if (nl_attrs[VDPA_ATTR_DEV_FEATURES]) {
    + config.device_features =
    + nla_get_u64(nl_attrs[VDPA_ATTR_DEV_FEATURES]);
    + config.mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);
    + }

    /* Skip checking capability if user didn't prefer to configure any
    * device networking attributes. It is likely that user might have used
    diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
    index d282f464d2f1..6d0f5e4e82c2 100644
    --- a/include/linux/vdpa.h
    +++ b/include/linux/vdpa.h
    @@ -104,6 +104,7 @@ struct vdpa_iova_range {
    };

    struct vdpa_dev_set_config {
    + u64 device_features;
    struct {
    u8 mac[ETH_ALEN];
    u16 mtu;
    diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
    index 25c55cab3d7c..9dc855f37c59 100644
    --- a/include/uapi/linux/vdpa.h
    +++ b/include/uapi/linux/vdpa.h
    @@ -52,6 +52,8 @@ enum vdpa_attr {
    VDPA_ATTR_DEV_VENDOR_ATTR_NAME, /* string */
    VDPA_ATTR_DEV_VENDOR_ATTR_VALUE, /* u64 */

    + VDPA_ATTR_DEV_FEATURES, /* u64 */
    +
    /* new attributes must be added above here */
    VDPA_ATTR_MAX,
    };
    --
    2.25.1
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