diff options
| -rw-r--r-- | net/Kconfig | 9 | ||||
| -rw-r--r-- | net/core/Makefile | 1 | ||||
| -rw-r--r-- | net/core/gso_test.c | 87 |
3 files changed, 97 insertions, 0 deletions
diff --git a/net/Kconfig b/net/Kconfig index e248236c29a7..3ec6bc98fa05 100644 --- a/net/Kconfig +++ b/net/Kconfig @@ -508,4 +508,13 @@ config NETDEV_ADDR_LIST_TEST default KUNIT_ALL_TESTS depends on KUNIT +config NET_TEST + tristate "KUnit tests for networking" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + KUnit tests covering core networking infra, such as sk_buff. + + If unsure, say N. + endif # if NET diff --git a/net/core/Makefile b/net/core/Makefile index 731db2eaa610..0cb734cbc24b 100644 --- a/net/core/Makefile +++ b/net/core/Makefile @@ -40,3 +40,4 @@ obj-$(CONFIG_NET_SOCK_MSG) += skmsg.o obj-$(CONFIG_BPF_SYSCALL) += sock_map.o obj-$(CONFIG_BPF_SYSCALL) += bpf_sk_storage.o obj-$(CONFIG_OF) += of_net.o +obj-$(CONFIG_NET_TEST) += gso_test.o diff --git a/net/core/gso_test.c b/net/core/gso_test.c new file mode 100644 index 000000000000..454874c11b90 --- /dev/null +++ b/net/core/gso_test.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-or-later + +#include <kunit/test.h> +#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 int payload_len = (2 * gso_size) + last_seg_size; + +static void __init_skb(struct sk_buff *skb) +{ + skb_reset_mac_header(skb); + memcpy(skb_mac_header(skb), hdr, sizeof(hdr)); + + /* skb_segment expects skb->data at start of payload */ + skb_pull(skb, sizeof(hdr)); + skb_reset_network_header(skb); + skb_reset_transport_header(skb); + + /* proto is arbitrary, as long as not ETH_P_TEB or vlan */ + skb->protocol = htons(ETH_P_ATALK); + skb_shinfo(skb)->gso_size = gso_size; +} + +static void gso_test_func(struct kunit *test) +{ + const int shinfo_size = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); + struct sk_buff *skb, *segs, *cur; + struct page *page; + + page = alloc_page(GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, page); + skb = build_skb(page_address(page), sizeof(hdr) + payload_len + shinfo_size); + KUNIT_ASSERT_NOT_NULL(test, skb); + __skb_put(skb, sizeof(hdr) + payload_len); + + __init_skb(skb); + + segs = skb_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); + if (IS_ERR(segs)) { + KUNIT_FAIL(test, "segs error %lld", PTR_ERR(segs)); + goto free_gso_skb; + } else if (!segs) { + KUNIT_FAIL(test, "no segments"); + goto free_gso_skb; + } + + for (cur = segs; cur; cur = cur->next) { + /* 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)); + + /* 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 */ + KUNIT_ASSERT_PTR_EQ(test, cur, segs->prev); + } + } + + consume_skb(segs); +free_gso_skb: + consume_skb(skb); +} + +static struct kunit_case gso_test_cases[] = { + KUNIT_CASE(gso_test_func), + {} +}; + +static struct kunit_suite gso_test_suite = { + .name = "net_core_gso", + .test_cases = gso_test_cases, +}; + +kunit_test_suite(gso_test_suite); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("KUnit tests for segmentation offload"); |