[PATCH v2 net-next 1/2] netdevsim: tc: allow to test nf_tables offload control plane code

[Florian Westphal <fw@strlen.de>]

The actual 'offload' is phony, all commands are ignored: this is only
useful to test control plane code.

Tag the existing callback to permit error injection to test rollback/abort
code in nf_tables.  This is also for fuzzers - the fault injection
framework allows probabilistic error insertion.

Signed-off-by: Florian Westphal <fw@strlen.de>
---
 v2: move extack error to nsim_setup_tc_block_cb

 drivers/net/netdevsim/bpf.c |  6 ------
 drivers/net/netdevsim/tc.c  | 20 +++++++++++++++++++-
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/net/netdevsim/bpf.c b/drivers/net/netdevsim/bpf.c
index 8eebcc933ddb..16aa88278398 100644
--- a/drivers/net/netdevsim/bpf.c
+++ b/drivers/net/netdevsim/bpf.c
@@ -123,12 +123,6 @@ int nsim_bpf_setup_tc_block_cb(enum tc_setup_type type,
 	struct netdevsim *ns = cb_priv;
 	struct bpf_prog *oldprog;
 
-	if (type != TC_SETUP_CLSBPF) {
-		NSIM_EA(cls_bpf->common.extack,
-			"only offload of BPF classifiers supported");
-		return -EOPNOTSUPP;
-	}
-
 	if (!tc_cls_can_offload_and_chain0(ns->netdev, &cls_bpf->common))
 		return -EOPNOTSUPP;
 
diff --git a/drivers/net/netdevsim/tc.c b/drivers/net/netdevsim/tc.c
index 8f013a5895a2..a415e02a6df1 100644
--- a/drivers/net/netdevsim/tc.c
+++ b/drivers/net/netdevsim/tc.c
@@ -9,7 +9,22 @@
 static int
 nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv)
 {
-	return nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv);
+	struct flow_cls_common_offload *common = type_data;
+	int err = 0;
+
+	switch (type) {
+	case TC_SETUP_CLSBPF:
+		err = nsim_bpf_setup_tc_block_cb(type, type_data, cb_priv);
+		break;
+	case TC_SETUP_CLSFLOWER:
+		break;
+	default:
+		NSIM_EA(common->extack, "offload type not supported");
+		err = -EOPNOTSUPP;
+		break;
+	}
+
+	return err;
 }
 
 static void nsim_taprio_stats(struct tc_taprio_qopt_stats *stats)
@@ -73,7 +88,10 @@ nsim_setup_tc(struct net_device *dev, enum tc_setup_type type, void *type_data)
 						  &nsim_block_cb_list,
 						  nsim_setup_tc_block_cb,
 						  ns, ns, true);
+	case TC_SETUP_FT:
+		return 0;
 	default:
 		return -EOPNOTSUPP;
 	}
 }
+ALLOW_ERROR_INJECTION(nsim_setup_tc, ERRNO);
-- 
2.53.0