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Message-ID: <20231008201244.3700784-3-willemdebruijn.kernel@gmail.com>
Date: Sun, 8 Oct 2023 16:12:33 -0400
From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
kuba@...nel.org,
edumazet@...gle.com,
pabeni@...hat.com,
alexander.duyck@...il.com,
fw@...len.de,
Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net-next v2 2/3] net: parametrize skb_segment unit test to expand coverage
From: Willem de Bruijn <willemb@...gle.com>
Expand the test with variants
- GSO_TEST_NO_GSO: payload size less than or equal to gso_size
- GSO_TEST_FRAGS: payload in both linear and page frags
- GSO_TEST_FRAGS_PURE: payload exclusively in page frags
- GSO_TEST_GSO_PARTIAL: produce one gso segment of multiple of gso_size,
plus optionally one non-gso trailer segment
Define a test struct that encodes the input gso skb and output segs.
Input in terms of linear and fragment lengths. Output as length of
each segment.
Signed-off-by: Willem de Bruijn <willemb@...gle.com>
---
net/core/gso_test.c | 129 ++++++++++++++++++++++++++++++++++++++------
1 file changed, 112 insertions(+), 17 deletions(-)
diff --git a/net/core/gso_test.c b/net/core/gso_test.c
index eaa85939ed208..c4e0b0832dbac 100644
--- a/net/core/gso_test.c
+++ b/net/core/gso_test.c
@@ -4,10 +4,7 @@
#include <linux/skbuff.h>
static const char hdr[] = "abcdefgh";
-static const int gso_size = 1000, last_seg_size = 1;
-
-/* default: create 3 segment gso packet */
-static const int payload_len = (2 * gso_size) + last_seg_size;
+static const int gso_size = 1000;
static void __init_skb(struct sk_buff *skb)
{
@@ -24,21 +21,121 @@ static void __init_skb(struct sk_buff *skb)
skb_shinfo(skb)->gso_size = gso_size;
}
+enum gso_test_nr {
+ GSO_TEST_LINEAR,
+ GSO_TEST_NO_GSO,
+ GSO_TEST_FRAGS,
+ GSO_TEST_FRAGS_PURE,
+ GSO_TEST_GSO_PARTIAL,
+};
+
+struct gso_test_case {
+ enum gso_test_nr id;
+ const char *name;
+
+ /* input */
+ unsigned int linear_len;
+ unsigned int nr_frags;
+ const unsigned int *frags;
+
+ /* output as expected */
+ unsigned int nr_segs;
+ const unsigned int *segs;
+};
+
+static struct gso_test_case cases[] = {
+ {
+ .id = GSO_TEST_NO_GSO,
+ .name = "no_gso",
+ .linear_len = gso_size,
+ .nr_segs = 1,
+ .segs = (const unsigned int[]) { gso_size },
+ },
+ {
+ .id = GSO_TEST_LINEAR,
+ .name = "linear",
+ .linear_len = gso_size + gso_size + 1,
+ .nr_segs = 3,
+ .segs = (const unsigned int[]) { gso_size, gso_size, 1 },
+ },
+ {
+ .id = GSO_TEST_FRAGS,
+ .name = "frags",
+ .linear_len = gso_size,
+ .nr_frags = 2,
+ .frags = (const unsigned int[]) { gso_size, 1 },
+ .nr_segs = 3,
+ .segs = (const unsigned int[]) { gso_size, gso_size, 1 },
+ },
+ {
+ .id = GSO_TEST_FRAGS_PURE,
+ .name = "frags_pure",
+ .nr_frags = 3,
+ .frags = (const unsigned int[]) { gso_size, gso_size, 2 },
+ .nr_segs = 3,
+ .segs = (const unsigned int[]) { gso_size, gso_size, 2 },
+ },
+ {
+ .id = GSO_TEST_GSO_PARTIAL,
+ .name = "gso_partial",
+ .linear_len = gso_size,
+ .nr_frags = 2,
+ .frags = (const unsigned int[]) { gso_size, 3 },
+ .nr_segs = 2,
+ .segs = (const unsigned int[]) { 2 * gso_size, 3 },
+ },
+};
+
+static void gso_test_case_to_desc(struct gso_test_case *t, char *desc)
+{
+ sprintf(desc, "%s", t->name);
+}
+
+KUNIT_ARRAY_PARAM(gso_test, cases, gso_test_case_to_desc);
+
static void gso_test_func(struct kunit *test)
{
const int shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+ const struct gso_test_case *tcase;
struct sk_buff *skb, *segs, *cur;
+ netdev_features_t features;
struct page *page;
+ int i;
+
+ tcase = test->param_value;
page = alloc_page(GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, page);
- skb = build_skb(page_address(page), sizeof(hdr) + payload_len + shinfo_size);
+ skb = build_skb(page_address(page), sizeof(hdr) + tcase->linear_len + shinfo_size);
KUNIT_ASSERT_NOT_NULL(test, skb);
- __skb_put(skb, sizeof(hdr) + payload_len);
+ __skb_put(skb, sizeof(hdr) + tcase->linear_len);
__init_skb(skb);
- segs = skb_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
+ if (tcase->nr_frags) {
+ unsigned int pg_off = 0;
+
+ page = alloc_page(GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, page);
+ page_ref_add(page, tcase->nr_frags - 1);
+
+ for (i = 0; i < tcase->nr_frags; i++) {
+ skb_fill_page_desc(skb, i, page, pg_off, tcase->frags[i]);
+ pg_off += tcase->frags[i];
+ }
+
+ KUNIT_ASSERT_LE(test, pg_off, PAGE_SIZE);
+
+ skb->data_len = pg_off;
+ skb->len += skb->data_len;
+ skb->truesize += skb->data_len;
+ }
+
+ features = NETIF_F_SG | NETIF_F_HW_CSUM;
+ if (tcase->id == GSO_TEST_GSO_PARTIAL)
+ features |= NETIF_F_GSO_PARTIAL;
+
+ segs = skb_segment(skb, features);
if (IS_ERR(segs)) {
KUNIT_FAIL(test, "segs error %lld", PTR_ERR(segs));
goto free_gso_skb;
@@ -47,7 +144,9 @@ static void gso_test_func(struct kunit *test)
goto free_gso_skb;
}
- for (cur = segs; cur; cur = cur->next) {
+ for (cur = segs, i = 0; cur; cur = cur->next, i++) {
+ KUNIT_ASSERT_EQ(test, cur->len, sizeof(hdr) + tcase->segs[i]);
+
/* segs have skb->data pointing to the mac header */
KUNIT_ASSERT_PTR_EQ(test, skb_mac_header(cur), cur->data);
KUNIT_ASSERT_PTR_EQ(test, skb_network_header(cur), cur->data + sizeof(hdr));
@@ -55,24 +154,20 @@ static void gso_test_func(struct kunit *test)
/* header was copied to all segs */
KUNIT_ASSERT_EQ(test, memcmp(skb_mac_header(cur), hdr, sizeof(hdr)), 0);
- /* all segs are gso_size, except for last */
- if (cur->next) {
- KUNIT_ASSERT_EQ(test, cur->len, sizeof(hdr) + gso_size);
- } else {
- KUNIT_ASSERT_EQ(test, cur->len, sizeof(hdr) + last_seg_size);
-
- /* last seg can be found through segs->prev pointer */
+ /* last seg can be found through segs->prev pointer */
+ if (!cur->next)
KUNIT_ASSERT_PTR_EQ(test, cur, segs->prev);
- }
}
+ KUNIT_ASSERT_EQ(test, i, tcase->nr_segs);
+
consume_skb(segs);
free_gso_skb:
consume_skb(skb);
}
static struct kunit_case gso_test_cases[] = {
- KUNIT_CASE(gso_test_func),
+ KUNIT_CASE_PARAM(gso_test_func, gso_test_gen_params),
{}
};
--
2.42.0.609.gbb76f46606-goog
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