This change adds the first kunit test for the mctp subsystem, and an
initial test for the fragmentation path.
We're adding tests under a new net/mctp/test/ directory.
Incorporates a fix for module configs:
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Jeremy Kerr <jk@xxxxxxxxxxxxxxxxxxxx>
---
v2:
- only enable tests when MCTP=y
- strict route ref checking
---
net/mctp/Kconfig | 5 +
net/mctp/route.c | 5 +
net/mctp/test/route-test.c | 217 +++++++++++++++++++++++++++++++++++++
3 files changed, 227 insertions(+)
create mode 100644 net/mctp/test/route-test.c
diff --git a/net/mctp/Kconfig b/net/mctp/Kconfig
index 2cdf3d0a28c9..868c92272cbd 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
+ bool "MCTP core tests" if !KUNIT_ALL_TESTS
+ depends on MCTP=y && KUNIT=y
+ default KUNIT_ALL_TESTS
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..5e029592f556
--- /dev/null
+++ b/net/mctp/test/route-test.c
@@ -0,0 +1,217 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <kunit/test.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,
+ 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;
+ rt->rt.dev = NULL; /* somewhat illegal, but fine for current tests */
+
+ list_add_rcu(&rt->rt.list, &net->mctp.routes);
+
+ return rt;
+}
+
+static void mctp_test_route_destroy(struct kunit *test,
+ struct mctp_test_route *rt)
+{
+ unsigned int refs;
+
+ rtnl_lock();
+ list_del_rcu(&rt->rt.list);
+ rtnl_unlock();
+
+ skb_queue_purge(&rt->pkts);
+
+ refs = refcount_read(&rt->rt.refs);
+ KUNIT_ASSERT_EQ_MSG(test, refs, 1, "route ref imbalance");
+
+ kfree_rcu(&rt->rt, rcu);
+}
+
+static struct sk_buff *mctp_test_create_skb(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;
+}
+
+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, 10, mtu);
+ KUNIT_ASSERT_TRUE(test, rt);
+
+ /* The refcount would usually be incremented as part of a route lookup,
+ * but we're setting the route directly here.
+ */
+ refcount_inc(&rt->rt.refs);
+
+ 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(test, 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);
+
+static struct kunit_case mctp_test_cases[] = {
+ KUNIT_CASE_PARAM(mctp_test_fragment, mctp_frag_gen_params),
+ {}
+};
+
+static struct kunit_suite mctp_test_suite = {
+ .name = "mctp",
+ .test_cases = mctp_test_cases,
+};
+
+kunit_test_suite(mctp_test_suite);
--
2.33.0
