tap: Add check for USO features

Tap indicates support for USO features according to
capabilities of current kernel module.

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Signed-off-by: Andrew Melnychecnko <andrew@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/net/tap.c b/net/tap.c
index 14ea4ef..bcea8d0 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -57,6 +57,7 @@ typedef struct TAPState {
     bool write_poll;
     bool using_vnet_hdr;
     bool has_ufo;
+    bool has_uso;
     bool enabled;
     VHostNetState *vhost_net;
     unsigned host_vnet_hdr_len;
@@ -237,6 +238,15 @@ static bool tap_has_ufo(NetClientState *nc)
     return s->has_ufo;
 }
 
+static bool tap_has_uso(NetClientState *nc)
+{
+    TAPState *s = DO_UPCAST(TAPState, nc, nc);
+
+    assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
+
+    return s->has_uso;
+}
+
 static bool tap_has_vnet_hdr(NetClientState *nc)
 {
     TAPState *s = DO_UPCAST(TAPState, nc, nc);
@@ -384,6 +394,7 @@ static NetClientInfo net_tap_info = {
     .poll = tap_poll,
     .cleanup = tap_cleanup,
     .has_ufo = tap_has_ufo,
+    .has_uso = tap_has_uso,
     .has_vnet_hdr = tap_has_vnet_hdr,
     .has_vnet_hdr_len = tap_has_vnet_hdr_len,
     .get_using_vnet_hdr = tap_get_using_vnet_hdr,
@@ -413,6 +424,7 @@ static TAPState *net_tap_fd_init(NetClientState *peer,
     s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
     s->using_vnet_hdr = false;
     s->has_ufo = tap_probe_has_ufo(s->fd);
+    s->has_uso = tap_probe_has_uso(s->fd);
     s->enabled = true;
     tap_set_offload(&s->nc, 0, 0, 0, 0, 0, 0, 0);
     /*