vdpa: Support reading device features

When showing the available management devices, check if
VDPA_ATTR_DEV_SUPPORTED_FEATURES feature is available and print the
supported features for a management device.

Examples:
$ vdpa mgmtdev show
auxiliary/mlx5_core.sf.1:
  supported_classes net
  max_supported_vqs 257
  dev_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ MQ \
               CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM

$ vdpa -jp mgmtdev show
{
    "mgmtdev": {
        "auxiliary/mlx5_core.sf.1": {
            "supported_classes": [ "net" ],
            "max_supported_vqs": 257,
            "dev_features": [
"CSUM","GUEST_CSUM","MTU","HOST_TSO4","HOST_TSO6","STATUS","CTRL_VQ","MQ",\
"CTRL_MAC_ADDR","VERSION_1","ACCESS_PLATFORM" ]
        }
    }
}

Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: David Ahern <dsahern@kernel.org>

diff --git a/vdpa/vdpa.c b/vdpa/vdpa.c
index 9985b6caa6371eb1cda6525e640195a68e4a6fe2..3ae1b78f4cac816a0ecb013f29491e39d7387c2e 100644 (file)
--- a/vdpa/vdpa.c
+++ b/vdpa/vdpa.c
@@ -84,6 +84,7 @@ static const enum mnl_attr_data_type vdpa_policy[VDPA_ATTR_MAX + 1] = {
        [VDPA_ATTR_DEV_MAX_VQ_SIZE] = MNL_TYPE_U16,
        [VDPA_ATTR_DEV_NEGOTIATED_FEATURES] = MNL_TYPE_U64,
        [VDPA_ATTR_DEV_MGMTDEV_MAX_VQS] = MNL_TYPE_U32,
+       [VDPA_ATTR_DEV_SUPPORTED_FEATURES] = MNL_TYPE_U64,
 };
 
 static int attr_cb(const struct nlattr *attr, void *data)
@@ -492,14 +493,14 @@ static void print_features(struct vdpa *vdpa, uint64_t features, bool mgmtdevf,
 static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
                                struct nlattr **tb)
 {
+       uint64_t classes = 0;
        const char *class;
        unsigned int i;
 
        pr_out_handle_start(vdpa, tb);
 
        if (tb[VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES]) {
-               uint64_t classes = mnl_attr_get_u64(tb[VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES]);
-
+               classes = mnl_attr_get_u64(tb[VDPA_ATTR_MGMTDEV_SUPPORTED_CLASSES]);
                pr_out_array_start(vdpa, "supported_classes");
 
                for (i = 1; i < 64; i++) {
@@ -520,6 +521,16 @@ static void pr_out_mgmtdev_show(struct vdpa *vdpa, const struct nlmsghdr *nlh,
                print_uint(PRINT_ANY, "max_supported_vqs", "  max_supported_vqs %d", num_vqs);
        }
 
+       if (tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]) {
+               uint64_t features;
+
+               features  = mnl_attr_get_u64(tb[VDPA_ATTR_DEV_SUPPORTED_FEATURES]);
+               if (classes & BIT(VIRTIO_ID_NET))
+                       print_features(vdpa, features, true, VIRTIO_ID_NET);
+               else
+                       print_features(vdpa, features, true, 0);
+       }
+
        pr_out_handle_end(vdpa);
 }