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authorDavid S. Miller <davem@davemloft.net>2021-10-01 14:19:01 +0100
committerDavid S. Miller <davem@davemloft.net>2021-10-01 14:19:01 +0100
commit4f42ad2011d2fcbd89f5cdf56121271a8cd5ee5d (patch)
tree2ac618958bf66597aa813896b3a2eff068d1e05e /net/mctp
parentea2dd331bfaaeba74ba31facf437c29044f7d4cb (diff)
parentbbde430319eecf8e580a547405cd0536bb35f482 (diff)
Merge branch 'mctp-kunit-tests'
Jeremy Kerr says: ==================== MCTP kunit tests This change adds some initial kunit tests for the MCTP core. We'll expand the coverage in a future series, and augment with a few selftests, but this establishes a baseline set of tests for now. Thanks to the kunit folks for the framework! ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mctp')
-rw-r--r--net/mctp/Kconfig5
-rw-r--r--net/mctp/Makefile3
-rw-r--r--net/mctp/route.c5
-rw-r--r--net/mctp/test/route-test.c532
-rw-r--r--net/mctp/test/utils.c67
-rw-r--r--net/mctp/test/utils.h20
6 files changed, 632 insertions, 0 deletions
diff --git a/net/mctp/Kconfig b/net/mctp/Kconfig
index 2cdf3d0a28c9..15267a5043d9 100644
--- a/net/mctp/Kconfig
+++ b/net/mctp/Kconfig
@@ -11,3 +11,8 @@ menuconfig MCTP
This option enables core MCTP support. For communicating with other
devices, you'll want to enable a driver for a specific hardware
channel.
+
+config MCTP_TEST
+ tristate "MCTP core tests" if !KUNIT_ALL_TESTS
+ depends on MCTP && KUNIT
+ default KUNIT_ALL_TESTS
diff --git a/net/mctp/Makefile b/net/mctp/Makefile
index 0171333384d7..6cd55233e685 100644
--- a/net/mctp/Makefile
+++ b/net/mctp/Makefile
@@ -1,3 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_MCTP) += mctp.o
mctp-objs := af_mctp.o device.o route.o neigh.o
+
+# tests
+obj-$(CONFIG_MCTP_TEST) += test/utils.o
diff --git a/net/mctp/route.c b/net/mctp/route.c
index e20f3096d067..04781459b2be 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -11,6 +11,7 @@
*/
#include <linux/idr.h>
+#include <linux/kconfig.h>
#include <linux/mctp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
@@ -1228,3 +1229,7 @@ void __exit mctp_routes_exit(void)
rtnl_unregister(PF_MCTP, RTM_GETROUTE);
dev_remove_pack(&mctp_packet_type);
}
+
+#if IS_ENABLED(CONFIG_MCTP_TEST)
+#include "test/route-test.c"
+#endif
diff --git a/net/mctp/test/route-test.c b/net/mctp/test/route-test.c
new file mode 100644
index 000000000000..2785a8ea554c
--- /dev/null
+++ b/net/mctp/test/route-test.c
@@ -0,0 +1,532 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <kunit/test.h>
+
+#include "utils.h"
+
+struct mctp_test_route {
+ struct mctp_route rt;
+ struct sk_buff_head pkts;
+};
+
+static int mctp_test_route_output(struct mctp_route *rt, struct sk_buff *skb)
+{
+ struct mctp_test_route *test_rt = container_of(rt, struct mctp_test_route, rt);
+
+ skb_queue_tail(&test_rt->pkts, skb);
+
+ return 0;
+}
+
+/* local version of mctp_route_alloc() */
+static struct mctp_test_route *mctp_route_test_alloc(void)
+{
+ struct mctp_test_route *rt;
+
+ rt = kzalloc(sizeof(*rt), GFP_KERNEL);
+ if (!rt)
+ return NULL;
+
+ INIT_LIST_HEAD(&rt->rt.list);
+ refcount_set(&rt->rt.refs, 1);
+ rt->rt.output = mctp_test_route_output;
+
+ skb_queue_head_init(&rt->pkts);
+
+ return rt;
+}
+
+static struct mctp_test_route *mctp_test_create_route(struct net *net,
+ struct mctp_dev *dev,
+ mctp_eid_t eid,
+ unsigned int mtu)
+{
+ struct mctp_test_route *rt;
+
+ rt = mctp_route_test_alloc();
+ if (!rt)
+ return NULL;
+
+ rt->rt.min = eid;
+ rt->rt.max = eid;
+ rt->rt.mtu = mtu;
+ rt->rt.type = RTN_UNSPEC;
+ if (dev)
+ mctp_dev_hold(dev);
+ rt->rt.dev = dev;
+
+ list_add_rcu(&rt->rt.list, &net->mctp.routes);
+
+ return rt;
+}
+
+static void mctp_test_route_destroy(struct mctp_test_route *rt)
+{
+ rtnl_lock();
+ list_del_rcu(&rt->rt.list);
+ rtnl_unlock();
+
+ skb_queue_purge(&rt->pkts);
+ if (rt->rt.dev)
+ mctp_dev_put(rt->rt.dev);
+
+ kfree_rcu(&rt->rt, rcu);
+}
+
+static struct sk_buff *mctp_test_create_skb(const struct mctp_hdr *hdr,
+ unsigned int data_len)
+{
+ size_t hdr_len = sizeof(*hdr);
+ struct sk_buff *skb;
+ unsigned int i;
+ u8 *buf;
+
+ skb = alloc_skb(hdr_len + data_len, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+
+ memcpy(skb_put(skb, hdr_len), hdr, hdr_len);
+
+ buf = skb_put(skb, data_len);
+ for (i = 0; i < data_len; i++)
+ buf[i] = i & 0xff;
+
+ return skb;
+}
+
+static struct sk_buff *__mctp_test_create_skb_data(const struct mctp_hdr *hdr,
+ const void *data,
+ size_t data_len)
+{
+ size_t hdr_len = sizeof(*hdr);
+ struct sk_buff *skb;
+
+ skb = alloc_skb(hdr_len + data_len, GFP_KERNEL);
+ if (!skb)
+ return NULL;
+
+ memcpy(skb_put(skb, hdr_len), hdr, hdr_len);
+ memcpy(skb_put(skb, data_len), data, data_len);
+
+ return skb;
+}
+
+#define mctp_test_create_skb_data(h, d) \
+ __mctp_test_create_skb_data(h, d, sizeof(*d))
+
+struct mctp_frag_test {
+ unsigned int mtu;
+ unsigned int msgsize;
+ unsigned int n_frags;
+};
+
+static void mctp_test_fragment(struct kunit *test)
+{
+ const struct mctp_frag_test *params;
+ int rc, i, n, mtu, msgsize;
+ struct mctp_test_route *rt;
+ struct sk_buff *skb;
+ struct mctp_hdr hdr;
+ u8 seq;
+
+ params = test->param_value;
+ mtu = params->mtu;
+ msgsize = params->msgsize;
+
+ hdr.ver = 1;
+ hdr.src = 8;
+ hdr.dest = 10;
+ hdr.flags_seq_tag = MCTP_HDR_FLAG_TO;
+
+ skb = mctp_test_create_skb(&hdr, msgsize);
+ KUNIT_ASSERT_TRUE(test, skb);
+
+ rt = mctp_test_create_route(&init_net, NULL, 10, mtu);
+ KUNIT_ASSERT_TRUE(test, rt);
+
+ rc = mctp_do_fragment_route(&rt->rt, skb, mtu, MCTP_TAG_OWNER);
+ KUNIT_EXPECT_FALSE(test, rc);
+
+ n = rt->pkts.qlen;
+
+ KUNIT_EXPECT_EQ(test, n, params->n_frags);
+
+ for (i = 0;; i++) {
+ struct mctp_hdr *hdr2;
+ struct sk_buff *skb2;
+ u8 tag_mask, seq2;
+ bool first, last;
+
+ first = i == 0;
+ last = i == (n - 1);
+
+ skb2 = skb_dequeue(&rt->pkts);
+
+ if (!skb2)
+ break;
+
+ hdr2 = mctp_hdr(skb2);
+
+ tag_mask = MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO;
+
+ KUNIT_EXPECT_EQ(test, hdr2->ver, hdr.ver);
+ KUNIT_EXPECT_EQ(test, hdr2->src, hdr.src);
+ KUNIT_EXPECT_EQ(test, hdr2->dest, hdr.dest);
+ KUNIT_EXPECT_EQ(test, hdr2->flags_seq_tag & tag_mask,
+ hdr.flags_seq_tag & tag_mask);
+
+ KUNIT_EXPECT_EQ(test,
+ !!(hdr2->flags_seq_tag & MCTP_HDR_FLAG_SOM), first);
+ KUNIT_EXPECT_EQ(test,
+ !!(hdr2->flags_seq_tag & MCTP_HDR_FLAG_EOM), last);
+
+ seq2 = (hdr2->flags_seq_tag >> MCTP_HDR_SEQ_SHIFT) &
+ MCTP_HDR_SEQ_MASK;
+
+ if (first) {
+ seq = seq2;
+ } else {
+ seq++;
+ KUNIT_EXPECT_EQ(test, seq2, seq & MCTP_HDR_SEQ_MASK);
+ }
+
+ if (!last)
+ KUNIT_EXPECT_EQ(test, skb2->len, mtu);
+ else
+ KUNIT_EXPECT_LE(test, skb2->len, mtu);
+
+ kfree_skb(skb2);
+ }
+
+ mctp_test_route_destroy(rt);
+}
+
+static const struct mctp_frag_test mctp_frag_tests[] = {
+ {.mtu = 68, .msgsize = 63, .n_frags = 1},
+ {.mtu = 68, .msgsize = 64, .n_frags = 1},
+ {.mtu = 68, .msgsize = 65, .n_frags = 2},
+ {.mtu = 68, .msgsize = 66, .n_frags = 2},
+ {.mtu = 68, .msgsize = 127, .n_frags = 2},
+ {.mtu = 68, .msgsize = 128, .n_frags = 2},
+ {.mtu = 68, .msgsize = 129, .n_frags = 3},
+ {.mtu = 68, .msgsize = 130, .n_frags = 3},
+};
+
+static void mctp_frag_test_to_desc(const struct mctp_frag_test *t, char *desc)
+{
+ sprintf(desc, "mtu %d len %d -> %d frags",
+ t->msgsize, t->mtu, t->n_frags);
+}
+
+KUNIT_ARRAY_PARAM(mctp_frag, mctp_frag_tests, mctp_frag_test_to_desc);
+
+struct mctp_rx_input_test {
+ struct mctp_hdr hdr;
+ bool input;
+};
+
+static void mctp_test_rx_input(struct kunit *test)
+{
+ const struct mctp_rx_input_test *params;
+ struct mctp_test_route *rt;
+ struct mctp_test_dev *dev;
+ struct sk_buff *skb;
+
+ params = test->param_value;
+
+ dev = mctp_test_create_dev();
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+
+ rt = mctp_test_create_route(&init_net, dev->mdev, 8, 68);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rt);
+
+ skb = mctp_test_create_skb(&params->hdr, 1);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, skb);
+
+ __mctp_cb(skb);
+
+ mctp_pkttype_receive(skb, dev->ndev, &mctp_packet_type, NULL);
+
+ KUNIT_EXPECT_EQ(test, !!rt->pkts.qlen, params->input);
+
+ mctp_test_route_destroy(rt);
+ mctp_test_destroy_dev(dev);
+}
+
+#define RX_HDR(_ver, _src, _dest, _fst) \
+ { .ver = _ver, .src = _src, .dest = _dest, .flags_seq_tag = _fst }
+
+/* we have a route for EID 8 only */
+static const struct mctp_rx_input_test mctp_rx_input_tests[] = {
+ { .hdr = RX_HDR(1, 10, 8, 0), .input = true },
+ { .hdr = RX_HDR(1, 10, 9, 0), .input = false }, /* no input route */
+ { .hdr = RX_HDR(2, 10, 8, 0), .input = false }, /* invalid version */
+};
+
+static void mctp_rx_input_test_to_desc(const struct mctp_rx_input_test *t,
+ char *desc)
+{
+ sprintf(desc, "{%x,%x,%x,%x}", t->hdr.ver, t->hdr.src, t->hdr.dest,
+ t->hdr.flags_seq_tag);
+}
+
+KUNIT_ARRAY_PARAM(mctp_rx_input, mctp_rx_input_tests,
+ mctp_rx_input_test_to_desc);
+
+/* set up a local dev, route on EID 8, and a socket listening on type 0 */
+static void __mctp_route_test_init(struct kunit *test,
+ struct mctp_test_dev **devp,
+ struct mctp_test_route **rtp,
+ struct socket **sockp)
+{
+ struct sockaddr_mctp addr;
+ struct mctp_test_route *rt;
+ struct mctp_test_dev *dev;
+ struct socket *sock;
+ int rc;
+
+ dev = mctp_test_create_dev();
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev);
+
+ rt = mctp_test_create_route(&init_net, dev->mdev, 8, 68);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, rt);
+
+ rc = sock_create_kern(&init_net, AF_MCTP, SOCK_DGRAM, 0, &sock);
+ KUNIT_ASSERT_EQ(test, rc, 0);
+
+ addr.smctp_family = AF_MCTP;
+ addr.smctp_network = MCTP_NET_ANY;
+ addr.smctp_addr.s_addr = 8;
+ addr.smctp_type = 0;
+ rc = kernel_bind(sock, (struct sockaddr *)&addr, sizeof(addr));
+ KUNIT_ASSERT_EQ(test, rc, 0);
+
+ *rtp = rt;
+ *devp = dev;
+ *sockp = sock;
+}
+
+static void __mctp_route_test_fini(struct mctp_test_dev *dev,
+ struct mctp_test_route *rt,
+ struct socket *sock)
+{
+ sock_release(sock);
+ mctp_test_route_destroy(rt);
+ mctp_test_destroy_dev(dev);
+}
+
+struct mctp_route_input_sk_test {
+ struct mctp_hdr hdr;
+ u8 type;
+ bool deliver;
+};
+
+static void mctp_test_route_input_sk(struct kunit *test)
+{
+ const struct mctp_route_input_sk_test *params;
+ struct sk_buff *skb, *skb2;
+ struct mctp_test_route *rt;
+ struct mctp_test_dev *dev;
+ struct socket *sock;
+ int rc;
+
+ params = test->param_value;
+
+ __mctp_route_test_init(test, &dev, &rt, &sock);
+
+ skb = mctp_test_create_skb_data(&params->hdr, &params->type);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, skb);
+
+ skb->dev = dev->ndev;
+ __mctp_cb(skb);
+
+ rc = mctp_route_input(&rt->rt, skb);
+
+ if (params->deliver) {
+ KUNIT_EXPECT_EQ(test, rc, 0);
+
+ skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
+ KUNIT_EXPECT_NOT_ERR_OR_NULL(test, skb2);
+ KUNIT_EXPECT_EQ(test, skb->len, 1);
+
+ skb_free_datagram(sock->sk, skb2);
+
+ } else {
+ KUNIT_EXPECT_NE(test, rc, 0);
+ skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
+ KUNIT_EXPECT_PTR_EQ(test, skb2, NULL);
+ }
+
+ __mctp_route_test_fini(dev, rt, sock);
+}
+
+#define FL_S (MCTP_HDR_FLAG_SOM)
+#define FL_E (MCTP_HDR_FLAG_EOM)
+#define FL_T (MCTP_HDR_FLAG_TO)
+
+static const struct mctp_route_input_sk_test mctp_route_input_sk_tests[] = {
+ { .hdr = RX_HDR(1, 10, 8, FL_S | FL_E | FL_T), .type = 0, .deliver = true },
+ { .hdr = RX_HDR(1, 10, 8, FL_S | FL_E | FL_T), .type = 1, .deliver = false },
+ { .hdr = RX_HDR(1, 10, 8, FL_S | FL_E), .type = 0, .deliver = false },
+ { .hdr = RX_HDR(1, 10, 8, FL_E | FL_T), .type = 0, .deliver = false },
+ { .hdr = RX_HDR(1, 10, 8, FL_T), .type = 0, .deliver = false },
+ { .hdr = RX_HDR(1, 10, 8, 0), .type = 0, .deliver = false },
+};
+
+static void mctp_route_input_sk_to_desc(const struct mctp_route_input_sk_test *t,
+ char *desc)
+{
+ sprintf(desc, "{%x,%x,%x,%x} type %d", t->hdr.ver, t->hdr.src,
+ t->hdr.dest, t->hdr.flags_seq_tag, t->type);
+}
+
+KUNIT_ARRAY_PARAM(mctp_route_input_sk, mctp_route_input_sk_tests,
+ mctp_route_input_sk_to_desc);
+
+struct mctp_route_input_sk_reasm_test {
+ const char *name;
+ struct mctp_hdr hdrs[4];
+ int n_hdrs;
+ int rx_len;
+};
+
+static void mctp_test_route_input_sk_reasm(struct kunit *test)
+{
+ const struct mctp_route_input_sk_reasm_test *params;
+ struct sk_buff *skb, *skb2;
+ struct mctp_test_route *rt;
+ struct mctp_test_dev *dev;
+ struct socket *sock;
+ int i, rc;
+ u8 c;
+
+ params = test->param_value;
+
+ __mctp_route_test_init(test, &dev, &rt, &sock);
+
+ for (i = 0; i < params->n_hdrs; i++) {
+ c = i;
+ skb = mctp_test_create_skb_data(&params->hdrs[i], &c);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, skb);
+
+ skb->dev = dev->ndev;
+ __mctp_cb(skb);
+
+ rc = mctp_route_input(&rt->rt, skb);
+ }
+
+ skb2 = skb_recv_datagram(sock->sk, 0, 1, &rc);
+
+ if (params->rx_len) {
+ KUNIT_EXPECT_NOT_ERR_OR_NULL(test, skb2);
+ KUNIT_EXPECT_EQ(test, skb2->len, params->rx_len);
+ skb_free_datagram(sock->sk, skb2);
+
+ } else {
+ KUNIT_EXPECT_PTR_EQ(test, skb2, NULL);
+ }
+
+ __mctp_route_test_fini(dev, rt, sock);
+}
+
+#define RX_FRAG(f, s) RX_HDR(1, 10, 8, FL_T | (f) | ((s) << MCTP_HDR_SEQ_SHIFT))
+
+static const struct mctp_route_input_sk_reasm_test mctp_route_input_sk_reasm_tests[] = {
+ {
+ .name = "single packet",
+ .hdrs = {
+ RX_FRAG(FL_S | FL_E, 0),
+ },
+ .n_hdrs = 1,
+ .rx_len = 1,
+ },
+ {
+ .name = "single packet, offset seq",
+ .hdrs = {
+ RX_FRAG(FL_S | FL_E, 1),
+ },
+ .n_hdrs = 1,
+ .rx_len = 1,
+ },
+ {
+ .name = "start & end packets",
+ .hdrs = {
+ RX_FRAG(FL_S, 0),
+ RX_FRAG(FL_E, 1),
+ },
+ .n_hdrs = 2,
+ .rx_len = 2,
+ },
+ {
+ .name = "start & end packets, offset seq",
+ .hdrs = {
+ RX_FRAG(FL_S, 1),
+ RX_FRAG(FL_E, 2),
+ },
+ .n_hdrs = 2,
+ .rx_len = 2,
+ },
+ {
+ .name = "start & end packets, out of order",
+ .hdrs = {
+ RX_FRAG(FL_E, 1),
+ RX_FRAG(FL_S, 0),
+ },
+ .n_hdrs = 2,
+ .rx_len = 0,
+ },
+ {
+ .name = "start, middle & end packets",
+ .hdrs = {
+ RX_FRAG(FL_S, 0),
+ RX_FRAG(0, 1),
+ RX_FRAG(FL_E, 2),
+ },
+ .n_hdrs = 3,
+ .rx_len = 3,
+ },
+ {
+ .name = "missing seq",
+ .hdrs = {
+ RX_FRAG(FL_S, 0),
+ RX_FRAG(FL_E, 2),
+ },
+ .n_hdrs = 2,
+ .rx_len = 0,
+ },
+ {
+ .name = "seq wrap",
+ .hdrs = {
+ RX_FRAG(FL_S, 3),
+ RX_FRAG(FL_E, 0),
+ },
+ .n_hdrs = 2,
+ .rx_len = 2,
+ },
+};
+
+static void mctp_route_input_sk_reasm_to_desc(
+ const struct mctp_route_input_sk_reasm_test *t,
+ char *desc)
+{
+ sprintf(desc, "%s", t->name);
+}
+
+KUNIT_ARRAY_PARAM(mctp_route_input_sk_reasm, mctp_route_input_sk_reasm_tests,
+ mctp_route_input_sk_reasm_to_desc);
+
+static struct kunit_case mctp_test_cases[] = {
+ KUNIT_CASE_PARAM(mctp_test_fragment, mctp_frag_gen_params),
+ KUNIT_CASE_PARAM(mctp_test_rx_input, mctp_rx_input_gen_params),
+ KUNIT_CASE_PARAM(mctp_test_route_input_sk, mctp_route_input_sk_gen_params),
+ KUNIT_CASE_PARAM(mctp_test_route_input_sk_reasm,
+ mctp_route_input_sk_reasm_gen_params),
+ {}
+};
+
+static struct kunit_suite mctp_test_suite = {
+ .name = "mctp",
+ .test_cases = mctp_test_cases,
+};
+
+kunit_test_suite(mctp_test_suite);
diff --git a/net/mctp/test/utils.c b/net/mctp/test/utils.c
new file mode 100644
index 000000000000..e2ab1f3da357
--- /dev/null
+++ b/net/mctp/test/utils.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/netdevice.h>
+#include <linux/mctp.h>
+#include <linux/if_arp.h>
+
+#include <net/mctpdevice.h>
+#include <net/pkt_sched.h>
+
+#include "utils.h"
+
+static netdev_tx_t mctp_test_dev_tx(struct sk_buff *skb,
+ struct net_device *ndev)
+{
+ kfree(skb);
+ return NETDEV_TX_OK;
+}
+
+static const struct net_device_ops mctp_test_netdev_ops = {
+ .ndo_start_xmit = mctp_test_dev_tx,
+};
+
+static void mctp_test_dev_setup(struct net_device *ndev)
+{
+ ndev->type = ARPHRD_MCTP;
+ ndev->mtu = MCTP_DEV_TEST_MTU;
+ ndev->hard_header_len = 0;
+ ndev->addr_len = 0;
+ ndev->tx_queue_len = DEFAULT_TX_QUEUE_LEN;
+ ndev->flags = IFF_NOARP;
+ ndev->netdev_ops = &mctp_test_netdev_ops;
+ ndev->needs_free_netdev = true;
+}
+
+struct mctp_test_dev *mctp_test_create_dev(void)
+{
+ struct mctp_test_dev *dev;
+ struct net_device *ndev;
+ int rc;
+
+ ndev = alloc_netdev(sizeof(*dev), "mctptest%d", NET_NAME_ENUM,
+ mctp_test_dev_setup);
+ if (!ndev)
+ return NULL;
+
+ dev = netdev_priv(ndev);
+ dev->ndev = ndev;
+
+ rcu_read_lock();
+ dev->mdev = __mctp_dev_get(ndev);
+ mctp_dev_hold(dev->mdev);
+ rcu_read_unlock();
+
+ rc = register_netdev(ndev);
+ if (rc) {
+ free_netdev(ndev);
+ return NULL;
+ }
+
+ return dev;
+}
+
+void mctp_test_destroy_dev(struct mctp_test_dev *dev)
+{
+ mctp_dev_put(dev->mdev);
+ unregister_netdev(dev->ndev);
+}
diff --git a/net/mctp/test/utils.h b/net/mctp/test/utils.h
new file mode 100644
index 000000000000..df6aa1c03440
--- /dev/null
+++ b/net/mctp/test/utils.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __NET_MCTP_TEST_UTILS_H
+#define __NET_MCTP_TEST_UTILS_H
+
+#include <kunit/test.h>
+
+#define MCTP_DEV_TEST_MTU 68
+
+struct mctp_test_dev {
+ struct net_device *ndev;
+ struct mctp_dev *mdev;
+};
+
+struct mctp_test_dev;
+
+struct mctp_test_dev *mctp_test_create_dev(void);
+void mctp_test_destroy_dev(struct mctp_test_dev *dev);
+
+#endif /* __NET_MCTP_TEST_UTILS_H */