github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 18:13:41 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

selftests: net: add test for dst hint mechanism with directed broadcast addresses

Browse Source 
Add a test for ensuring that the dst hint mechanism is used for
directed broadcast addresses.

This test relies on mausezahn for sending directed broadcast packets.
Additionally, a high GRO flush timeout is set to ensure that packets
will be received as lists.

The test determines if the hint mechanism was used by checking
the in_brd statistic using lnstat.

Signed-off-by: Oscar Maes <oscmaes92@gmail.com>
Link: https://patch.msgid.link/20250819174642.5148-3-oscmaes92@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Oscar Maes 2025-08-19 19:46:42 +02:00 committed by Jakub Kicinski
parent 1b8c5fa0cb
commit bd0d9e751b
2 changed files with 80 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/testing/selftests/net/Makefile
View File

@ -117,6 +117,7 @@ TEST_GEN_FILES += tfo
TEST_PROGS += tfo_passive.sh
TEST_PROGS += broadcast_pmtu.sh
TEST_PROGS += ipv6_force_forwarding.sh
TEST_PROGS += route_hint.sh
# YNL files, must be before "include ..lib.mk"
YNL_GEN_FILES := busy_poller netlink-dumps

79
tools/testing/selftests/net/route_hint.sh Executable file
View File

@ -0,0 +1,79 @@
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# This test ensures directed broadcast routes use dst hint mechanism
source lib.sh
CLIENT_IP4="192.168.0.1"
SERVER_IP4="192.168.0.2"
BROADCAST_ADDRESS="192.168.0.255"
setup() {
setup_ns CLIENT_NS SERVER_NS
ip -net "${SERVER_NS}" link add link1 type veth peer name link0 netns "${CLIENT_NS}"
ip -net "${CLIENT_NS}" link set link0 up
ip -net "${CLIENT_NS}" addr add "${CLIENT_IP4}/24" dev link0
ip -net "${SERVER_NS}" link set link1 up
ip -net "${SERVER_NS}" addr add "${SERVER_IP4}/24" dev link1
ip netns exec "${CLIENT_NS}" ethtool -K link0 tcp-segmentation-offload off
ip netns exec "${SERVER_NS}" sh -c "echo 500000000 > /sys/class/net/link1/gro_flush_timeout"
ip netns exec "${SERVER_NS}" sh -c "echo 1 > /sys/class/net/link1/napi_defer_hard_irqs"
ip netns exec "${SERVER_NS}" ethtool -K link1 generic-receive-offload on
}
cleanup() {
ip -net "${SERVER_NS}" link del link1
cleanup_ns "${CLIENT_NS}" "${SERVER_NS}"
}
directed_bcast_hint_test()
{
local rc=0
echo "Testing for directed broadcast route hint"
orig_in_brd=$(ip netns exec "${SERVER_NS}" lnstat -j -i1 -c1 | jq '.in_brd')
ip netns exec "${CLIENT_NS}" mausezahn link0 -a own -b bcast -A "${CLIENT_IP4}" \
-B "${BROADCAST_ADDRESS}" -c1 -t tcp "sp=1-100,dp=1234,s=1,a=0" -p 5 -q
sleep 1
new_in_brd=$(ip netns exec "${SERVER_NS}" lnstat -j -i1 -c1 | jq '.in_brd')
res=$(echo "${new_in_brd} - ${orig_in_brd}" | bc)
if [ "${res}" -lt 100 ]; then
echo "[ OK ]"
rc="${ksft_pass}"
else
echo "[FAIL] expected in_brd to be under 100, got ${res}"
rc="${ksft_fail}"
fi
return "${rc}"
}
if [ ! -x "$(command -v mausezahn)" ]; then
echo "SKIP: Could not run test without mausezahn tool"
exit "${ksft_skip}"
fi
if [ ! -x "$(command -v jq)" ]; then
echo "SKIP: Could not run test without jq tool"
exit "${ksft_skip}"
fi
if [ ! -x "$(command -v bc)" ]; then
echo "SKIP: Could not run test without bc tool"
exit "${ksft_skip}"
fi
trap cleanup EXIT
setup
directed_bcast_hint_test
exit $?