From f2b50f17268390567bc0e95642170d88f336c8f4 Mon Sep 17 00:00:00 2001

From: Kal Conley <kal.conley@dectris.com>

Date: Wed, 5 Apr 2023 10:29:04 +0200

Subject: [PATCH] selftests: xsk: Disable IPv6 on VETH1

Git-commit: f2b50f17268390567bc0e95642170d88f336c8f4

Patch-mainline: v6.4-rc1

References: git-fixes

This change fixes flakiness in the BIDIRECTIONAL test:

    # [is_pkt_valid] expected length [60], got length [90]

    not ok 1 FAIL: SKB BUSY-POLL BIDIRECTIONAL

When IPv6 is enabled, the interface will periodically send MLDv1 and

MLDv2 packets. These packets can cause the BIDIRECTIONAL test to fail

since it uses VETH0 for RX.

For other tests, this was not a problem since they only receive on VETH1

and IPv6 was already disabled on VETH0.

Fixes: a89052572ebb ("selftests/bpf: Xsk selftests framework")

Signed-off-by: Kal Conley <kal.conley@dectris.com>

Link: https://lore.kernel.org/r/20230405082905.6303-1-kal.conley@dectris.com

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>

Acked-by: Takashi Iwai <tiwai@suse.de>

---

 tools/testing/selftests/bpf/test_xsk.sh |    1 +

 1 file changed, 1 insertion(+)

--- a/tools/testing/selftests/bpf/test_xsk.sh

+++ b/tools/testing/selftests/bpf/test_xsk.sh

@@ -110,6 +110,7 @@ setup_vethPairs() {

 	ip link add ${VETH0} numtxqueues 4 numrxqueues 4 type veth peer name ${VETH1} numtxqueues 4 numrxqueues 4

 	if [ -f /proc/net/if_inet6 ]; then

 		echo 1 > /proc/sys/net/ipv6/conf/${VETH0}/disable_ipv6

+		echo 1 > /proc/sys/net/ipv6/conf/${VETH1}/disable_ipv6

 	fi

 	if [[ $verbose -eq 1 ]]; then

 	        echo "setting up ${VETH1}: namespace: ${NS1}"