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selftests/net: Add test coverage for UDP GSO software fallback

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Extend the existing test to exercise UDP GSO egress through devices with
various offload capabilities, including lack of checksum offload, which is
the default case for TUN/TAP devices.

Test against a dummy device because it is simpler to set up then TUN/TAP.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20240626-linux-udpgso-v2-2-422dfcbd6b48@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Sitnicki 2024-06-26 19:51:27 +02:00 committed by Jakub Kicinski
parent 10154dbded
commit 3e400219c0
2 changed files with 55 additions and 3 deletions
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15
tools/testing/selftests/net/udpgso.c
View File

@ -53,6 +53,7 @@ static bool cfg_do_ipv6;
static bool cfg_do_connected;
static bool cfg_do_connectionless;
static bool cfg_do_msgmore;
static bool cfg_do_recv = true;
static bool cfg_do_setsockopt;
static int cfg_specific_test_id = -1;
@ -414,6 +415,9 @@ static void run_one(struct testcase *test, int fdt, int fdr,
if (!sent)
return;
if (!cfg_do_recv)
return;
if (test->gso_len)
mss = test->gso_len;
else
@ -464,8 +468,10 @@ static void run_test(struct sockaddr *addr, socklen_t alen)
if (fdr == -1)
error(1, errno, "socket r");
if (bind(fdr, addr, alen))
error(1, errno, "bind");
if (cfg_do_recv) {
if (bind(fdr, addr, alen))
error(1, errno, "bind");
}
/* Have tests fail quickly instead of hang */
if (setsockopt(fdr, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)))
@ -524,7 +530,7 @@ static void parse_opts(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "46cCmst:")) != -1) {
while ((c = getopt(argc, argv, "46cCmRst:")) != -1) {
switch (c) {
case '4':
cfg_do_ipv4 = true;
@ -541,6 +547,9 @@ static void parse_opts(int argc, char **argv)
case 'm':
cfg_do_msgmore = true;
break;
case 'R':
cfg_do_recv = false;
break;
case 's':
cfg_do_setsockopt = true;
break;

43
tools/testing/selftests/net/udpgso.sh
View File

@ -27,6 +27,31 @@ test_route_mtu() {
ip route add local fd00::1/128 table local dev lo mtu 1500
}
setup_dummy_sink() {
ip link add name sink mtu 1500 type dummy
ip addr add dev sink 10.0.0.0/24
ip addr add dev sink fd00::2/64 nodad
ip link set dev sink up
}
test_hw_gso_hw_csum() {
setup_dummy_sink
ethtool -K sink tx-checksum-ip-generic on >/dev/null
ethtool -K sink tx-udp-segmentation on >/dev/null
}
test_sw_gso_hw_csum() {
setup_dummy_sink
ethtool -K sink tx-checksum-ip-generic on >/dev/null
ethtool -K sink tx-udp-segmentation off >/dev/null
}
test_sw_gso_sw_csum() {
setup_dummy_sink
ethtool -K sink tx-checksum-ip-generic off >/dev/null
ethtool -K sink tx-udp-segmentation off >/dev/null
}
if [ "$#" -gt 0 ]; then
"$1"
shift 2 # pop "test_*" arg and "--" delimiter
@ -56,3 +81,21 @@ echo "ipv4 msg_more"
echo "ipv6 msg_more"
./in_netns.sh "$0" test_dev_mtu -- ./udpgso -6 -C -m
echo "ipv4 hw-gso hw-csum"
./in_netns.sh "$0" test_hw_gso_hw_csum -- ./udpgso -4 -C -R
echo "ipv6 hw-gso hw-csum"
./in_netns.sh "$0" test_hw_gso_hw_csum -- ./udpgso -6 -C -R
echo "ipv4 sw-gso hw-csum"
./in_netns.sh "$0" test_sw_gso_hw_csum -- ./udpgso -4 -C -R
echo "ipv6 sw-gso hw-csum"
./in_netns.sh "$0" test_sw_gso_hw_csum -- ./udpgso -6 -C -R
echo "ipv4 sw-gso sw-csum"
./in_netns.sh "$0" test_sw_gso_sw_csum -- ./udpgso -4 -C -R
echo "ipv6 sw-gso sw-csum"
./in_netns.sh "$0" test_sw_gso_sw_csum -- ./udpgso -6 -C -R