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// 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);
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