netdevsim: use tc_cls_can_offload_and_chain0()

Make use of tc_cls_can_offload_and_chain0() to set extack msg in case
ethtool tc offload flag is not set or chain unsupported.
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netdevsim/bpf.c

@@ -135,7 +135,7 @@ int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 		return -EOPNOTSUPP;
 	}
 
-	if (!tc_can_offload_extack(ns->netdev, cls_bpf->common.extack))
+	if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
 		return -EOPNOTSUPP;
 
 	if (cls_bpf->common.protocol != htons(ETH_P_ALL)) {
@@ -144,9 +144,6 @@ int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 		return -EOPNOTSUPP;
 	}
 
-	if (cls_bpf->common.chain_index)
-		return -EOPNOTSUPP;
-
 	if (!ns->bpf_tc_accept) {
 		NSIM_EA(cls_bpf->common.extack,
 			"netdevsim configured to reject BPF TC offload");