[PATCH net-next v2 7/8] selftests: drv-net: gro: test ip6ip6

Jakub Kicinski
2026-04-02T21:00:14Z

We explicitly test ipip encap. Let's add ip6ip6, too. Having
just ipip seems like favoring IPv4 which we should not do :)
Testing all combinations is left for future work, not sure
it's actually worth it.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
tools/testing/selftests/net/lib/gro.c | 23 +++++++++++++++++-----
tools/testing/selftests/drivers/net/gro.py | 2 +-
2 files changed, 19 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/net/lib/gro.c b/tools/testing/selftests/net/lib/gro.c
index dc8638d5d74d..b99c0f00b8fe 100644
--- a/tools/testing/selftests/net/lib/gro.c
+++ b/tools/testing/selftests/net/lib/gro.c
@@ -96,7 +96,8 @@
#define ETH_P_NONE 0
#define ASSUMED_MTU 4096
#define MAX_MSS (ASSUMED_MTU - sizeof(struct iphdr) - sizeof(struct tcphdr))
-#define MAX_HDR_LEN (ETH_HLEN + sizeof(struct ipv6hdr) + sizeof(struct tcphdr))
+#define MAX_HDR_LEN \
+ (ETH_HLEN + sizeof(struct ipv6hdr) * 2 + sizeof(struct tcphdr))
#define MAX_LARGE_PKT_CNT ((IP_MAXPACKET - (MAX_HDR_LEN - ETH_HLEN)) / \
(ASSUMED_MTU - (MAX_HDR_LEN - ETH_HLEN)))
#define MIN_EXTHDR_SIZE 8
@@ -131,6 +132,7 @@ static int tcp_offset = -1;
static int total_hdr_len = -1;
static int ethhdr_proto = -1;
static bool ipip;
+static bool ip6ip6;
static uint64_t txtime_ns;
static int num_flows = 4;
static bool order_check;
@@ -1125,7 +1127,8 @@ static void check_recv_pkts(int fd, int *correct_payload,

if (iph->version == 4)
ip_ext_len = (iph->ihl - 5) * 4;
- else if (ip6h->version == 6 && ip6h->nexthdr != IPPROTO_TCP)
+ else if (ip6h->version == 6 && !ip6ip6 &&
+ ip6h->nexthdr != IPPROTO_TCP)
ip_ext_len = MIN_EXTHDR_SIZE;

tcph = (struct tcphdr *)(buffer + tcp_offset + ip_ext_len);
@@ -1187,7 +1190,8 @@ static void check_capacity_pkts(int fd)

if (iph->version == 4)
ip_ext_len = (iph->ihl - 5) * 4;
- else if (ip6h->version == 6 && ip6h->nexthdr != IPPROTO_TCP)
+ else if (ip6h->version == 6 && !ip6ip6 &&
+ ip6h->nexthdr != IPPROTO_TCP)
ip_ext_len = MIN_EXTHDR_SIZE;

tcph = (struct tcphdr *)(buffer + tcp_offset + ip_ext_len);
@@ -1700,6 +1704,7 @@ static void parse_args(int argc, char **argv)
{ "ipv4", no_argument, NULL, '4' },
{ "ipv6", no_argument, NULL, '6' },
{ "ipip", no_argument, NULL, 'e' },
+ { "ip6ip6", no_argument, NULL, 'E' },
{ "num-flows", required_argument, NULL, 'n' },
{ "rx", no_argument, NULL, 'r' },
{ "saddr", required_argument, NULL, 's' },
@@ -1711,7 +1716,7 @@ static void parse_args(int argc, char **argv)
};
int c;

- while ((c = getopt_long(argc, argv, "46d:D:ei:n:rs:S:t:ov", opts, NULL)) != -1) {
+ while ((c = getopt_long(argc, argv, "46d:D:eEi:n:rs:S:t:ov", opts, NULL)) != -1) {
switch (c) {
case '4':
proto = PF_INET;
@@ -1726,6 +1731,11 @@ static void parse_args(int argc, char **argv)
proto = PF_INET;
ethhdr_proto = htons(ETH_P_IP);
break;
+ case 'E':
+ ip6ip6 = true;
+ proto = PF_INET6;
+ ethhdr_proto = htons(ETH_P_IPV6);
+ break;
case 'd':
addr4_dst = addr6_dst = optarg;
break;
@@ -1770,12 +1780,15 @@ int main(int argc, char **argv)
if (ipip) {
tcp_offset = ETH_HLEN + sizeof(struct iphdr) * 2;
total_hdr_len = tcp_offset + sizeof(struct tcphdr);
+ } else if (ip6ip6) {
+ tcp_offset = ETH_HLEN + sizeof(struct ipv6hdr) * 2;
+ total_hdr_len = tcp_offset + sizeof(struct tcphdr);
} else if (proto == PF_INET) {
tcp_offset = ETH_HLEN + sizeof(struct iphdr);
total_hdr_len = tcp_offset + sizeof(struct tcphdr);
} else if (proto == PF_INET6) {
tcp_offset = ETH_HLEN + sizeof(struct ipv6hdr);
- total_hdr_len = MAX_HDR_LEN;
+ total_hdr_len = tcp_offset + sizeof(struct tcphdr);
} else {
error(1, 0, "Protocol family is not ipv4 or ipv6");
}
diff --git a/tools/testing/selftests/drivers/net/gro.py b/tools/testing/selftests/drivers/net/gro.py
index 73436d16b40d..ee95144b73ac 100755
--- a/tools/testing/selftests/drivers/net/gro.py
+++ b/tools/testing/selftests/drivers/net/gro.py
@@ -313,7 +313,7 @@ def _run_gro_bin(cfg, test_name, protocol=None, num_flows=None,
]

for mode in ["sw", "hw", "lro"]:
- for protocol in ["ipv4", "ipv6", "ipip"]:
+ for protocol in ["ipv4", "ipv6", "ipip", "ip6ip6"]:
for test_name in common_tests:
yield mode, protocol, test_name

--
2.53.0