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Message-ID: <e1ce1c1088ef29c0bab70d4906a7e24cd6b41626.1763345426.git.xudu@redhat.com>
Date: Mon, 17 Nov 2025 14:25:04 +0800
From: xu du <xudu@...hat.com>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next 8/8] selftest: tun: Add test data for success and failure paths
To improve the robustness and coverage of the TUN selftests, this
patch expands the set of test data.
Signed-off-by: xu du <xudu@...hat.com>
---
tools/testing/selftests/net/tun.c | 115 +++++++++++++++++++++++++++++-
1 file changed, 113 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/net/tun.c b/tools/testing/selftests/net/tun.c
index 19524748db44..7a2062f87c6a 100644
--- a/tools/testing/selftests/net/tun.c
+++ b/tools/testing/selftests/net/tun.c
@@ -57,6 +57,10 @@ static struct in6_addr param_ipaddr6_inner_src = {
{ { 0x20, 0x02, 0x0d, 0xb8, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 } },
};
+#ifndef BIT
+#define BIT(nr) (1UL << (nr))
+#endif
+
#define VN_ID 1
#define VN_PORT 4789
#define UDP_SRC_PORT 22
@@ -70,6 +74,8 @@ static struct in6_addr param_ipaddr6_inner_src = {
#define UDP_TUNNEL_VXLAN_4IN6 0x04
#define UDP_TUNNEL_VXLAN_6IN6 0x08
+#define UDP_TUNNEL_MAX_SEGMENTS BIT(7)
+
#define UDP_TUNNEL_OUTER_IPV4 (UDP_TUNNEL_VXLAN_4IN4 | UDP_TUNNEL_VXLAN_6IN4)
#define UDP_TUNNEL_INNER_IPV4 (UDP_TUNNEL_VXLAN_4IN4 | UDP_TUNNEL_VXLAN_4IN6)
@@ -527,6 +533,39 @@ FIXTURE_VARIANT(tun_vnet_udptnl)
/* clang-format off */
#define TUN_VNET_UDPTNL_VARIANT_ADD(type, desc) \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_nogsosz_1byte) { \
+ /* no GSO: send a single byte */ \
+ .tunnel_type = type, \
+ .data_size = 1, \
+ .r_num_mss = 1, \
+ .is_tap = true, \
+ .no_gso = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_nogsosz_1mss) { \
+ /* no GSO: send a single MSS, fall back to no GSO */ \
+ .tunnel_type = type, \
+ .data_size = UDP_TUNNEL_MSS(type), \
+ .r_num_mss = 1, \
+ .is_tap = true, \
+ .no_gso = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_nogsosz_gtmss) { \
+ /* no GSO: send a single MSS + 1B: fail */ \
+ .tunnel_type = type, \
+ .data_size = UDP_TUNNEL_MSS(type) + 1, \
+ .r_num_mss = 1, \
+ .is_tap = true, \
+ .no_gso = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_1byte) { \
+ /* GSO: send 1 byte, gso 1 byte, fall back to no GSO */ \
+ .tunnel_type = type, \
+ .gso_size = 1, \
+ .data_size = 1, \
+ .r_num_mss = 1, \
+ .is_tap = true, \
+ .no_gso = true, \
+ }; \
FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_1mss) { \
/* send a single MSS: fall back to no GSO */ \
.tunnel_type = type, \
@@ -535,8 +574,65 @@ FIXTURE_VARIANT(tun_vnet_udptnl)
.r_num_mss = 1, \
.is_tap = true, \
.no_gso = true, \
- };
-/* clang-format on */
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_ltgso) { \
+ /* data <= MSS < gso: will fall back to no GSO */ \
+ .tunnel_type = type, \
+ .gso_size = UDP_TUNNEL_MSS(type) + 1, \
+ .data_size = UDP_TUNNEL_MSS(type), \
+ .r_num_mss = 1, \
+ .is_tap = true, \
+ .no_gso = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_gtgso) { \
+ /* GSO: a single MSS + 1B */ \
+ .tunnel_type = type, \
+ .gso_size = UDP_TUNNEL_MSS(type), \
+ .data_size = UDP_TUNNEL_MSS(type) + 1, \
+ .r_num_mss = 2, \
+ .is_tap = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_2mss) { \
+ /* no GSO: send exactly 2 MSS */ \
+ .tunnel_type = type, \
+ .gso_size = UDP_TUNNEL_MSS(type), \
+ .data_size = UDP_TUNNEL_MSS(type) * 2, \
+ .r_num_mss = 2, \
+ .is_tap = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_maxbytes) { \
+ /* GSO: send max bytes */ \
+ .tunnel_type = type, \
+ .gso_size = UDP_TUNNEL_MSS(type), \
+ .data_size = UDP_TUNNEL_MAX(type, true), \
+ .r_num_mss = UDP_TUNNEL_MAX(type, true) / \
+ UDP_TUNNEL_MSS(type) + 1, \
+ .is_tap = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_over_maxbytes) { \
+ /* GSO: send oversize max bytes: fail */ \
+ .tunnel_type = type, \
+ .gso_size = UDP_TUNNEL_MSS(type), \
+ .data_size = ETH_MAX_MTU, \
+ .r_num_mss = ETH_MAX_MTU / UDP_TUNNEL_MSS(type) + 1, \
+ .is_tap = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_maxsegs) { \
+ /* GSO: send max number of min sized segments */ \
+ .tunnel_type = type, \
+ .gso_size = 1, \
+ .data_size = UDP_TUNNEL_MAX_SEGMENTS, \
+ .r_num_mss = UDP_TUNNEL_MAX_SEGMENTS, \
+ .is_tap = true, \
+ }; \
+ FIXTURE_VARIANT_ADD(tun_vnet_udptnl, desc##_5byte) { \
+ /* GSO: send 5 bytes, gso 2 bytes */ \
+ .tunnel_type = type, \
+ .gso_size = 2, \
+ .data_size = 5, \
+ .r_num_mss = 3, \
+ .is_tap = true, \
+ } /* clang-format on */
TUN_VNET_UDPTNL_VARIANT_ADD(UDP_TUNNEL_VXLAN_4IN4, 4in4);
TUN_VNET_UDPTNL_VARIANT_ADD(UDP_TUNNEL_VXLAN_6IN4, 6in4);
@@ -860,4 +956,19 @@ TEST_F(tun_vnet_udptnl, recv_gso_packet)
}
}
+XFAIL_ADD(tun_vnet_udptnl, 4in4_nogsosz_gtmss, recv_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 6in4_nogsosz_gtmss, recv_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 4in6_nogsosz_gtmss, recv_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 6in6_nogsosz_gtmss, recv_gso_packet);
+
+XFAIL_ADD(tun_vnet_udptnl, 4in4_over_maxbytes, send_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 6in4_over_maxbytes, send_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 4in6_over_maxbytes, send_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 6in6_over_maxbytes, send_gso_packet);
+
+XFAIL_ADD(tun_vnet_udptnl, 4in4_over_maxbytes, recv_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 6in4_over_maxbytes, recv_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 4in6_over_maxbytes, recv_gso_packet);
+XFAIL_ADD(tun_vnet_udptnl, 6in6_over_maxbytes, recv_gso_packet);
+
TEST_HARNESS_MAIN
--
2.49.0
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