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test: Explicitly wait for DAD to complete on SLAAC addresses

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Getting a SLAAC address takes a little while because the kernel must
complete Duplicate Address Detection (DAD) before marking the address as
ready.  In several places we have an explicit 'sleep 2' to wait for that
to complete.

Fixed length delays are never a great idea, although this one is pretty
solid.  Still, it would be better to explicitly wait for DAD to complete
in case of long delays (which might happen on slow emulated hosts, or with
heavy load), and to speed the tests up if DAD completes quicker.

Replace the fixed sleeps with a loop waiting for DAD to complete.  We do
this by looping waiting for all tentative addresses to disappear.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-10-18 12:35:51 +11:00 committed by Stefano Brivio
parent f9d677bff6
commit 75b9c0feb0
3 changed files with 7 additions and 3 deletions
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4
test/passt/ndp
View file

@ -16,7 +16,9 @@ htools ip jq sipcalc grep cut
test Interface name
gout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
guest ip link set dev __IFNAME__ up && sleep 2
guest ip link set dev __IFNAME__ up
# Wait for DAD to complete
guest while ip -j -6 addr show tentative | jq -e '.[].addr_info'; do sleep 0.1; done
hout HOST_IFNAME6 ip -j -6 route show|jq -rM '[.[] | select(.dst == "default").dev] | .[0]'
check [ -n "__IFNAME__" ]

3
test/pasta/ndp
View file

@ -18,7 +18,8 @@ test Interface name
nsout IFNAME ip -j link show | jq -rM '.[] | select(.link_type == "ether").ifname'
check [ -n "__IFNAME__" ]
ns ip link set dev __IFNAME__ up
sleep 2
# Wait for DAD to complete
ns while ip -j -6 addr show tentative | jq -e '.[].addr_info'; do sleep 0.1; done
test SLAAC: prefix
nsout ADDR6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__IFNAME__").addr_info[] | select(.scope == "global" and .prefixlen == 64).local] | .[0]'

3
test/two_guests/basic
View file

@ -36,7 +36,8 @@ check [ "__ADDR2__" = "__HOST_ADDR__" ]
test DHCPv6: addresses
# Link is up now, wait for DAD to complete
sleep 2
guest1 while ip -j -6 addr show tentative | jq -e '.[].addr_info'; do sleep 0.1; done
guest2 while ip -j -6 addr show tentative | jq -e '.[].addr_info'; do sleep 0.1; done
guest1 /sbin/dhclient -6 __IFNAME1__
guest2 /sbin/dhclient -6 __IFNAME2__
g1out ADDR1_6 ip -j -6 addr show|jq -rM '[.[] | select(.ifname == "__IFNAME1__").addr_info[] | select(.prefixlen == 128).local] | .[0]'