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38e058cc7d
When deleting the netns and recreating a new one while re-adding the
veth interface, there is a small window of time during which the old
veth interface has not yet been removed. This can cause the new addition
to fail. To resolve this issue, we can either wait for a short while to
ensure that the old veth interface is deleted, or we can specifically
remove the veth interface.
Before this patch:
# ./rps_default_mask.sh
empty rps_default_mask [ ok ]
changing rps_default_mask dont affect existing devices [ ok ]
changing rps_default_mask dont affect existing netns [ ok ]
changing rps_default_mask affect newly created devices [ ok ]
changing rps_default_mask don't affect newly child netns[II][ ok ]
rps_default_mask is 0 by default in child netns [ ok ]
RTNETLINK answers: File exists
changing rps_default_mask in child ns don't affect the main one[ ok ]
cat: /sys/class/net/vethC11an1/queues/rx-0/rps_cpus: No such file or directory
changing rps_default_mask in child ns affects new childns devices./rps_default_mask.sh: line 36: [: -eq: unary operator expected
[fail] expected 1 found
changing rps_default_mask in child ns don't affect existing devices[ ok ]
After this patch:
# ./rps_default_mask.sh
empty rps_default_mask [ ok ]
changing rps_default_mask dont affect existing devices [ ok ]
changing rps_default_mask dont affect existing netns [ ok ]
changing rps_default_mask affect newly created devices [ ok ]
changing rps_default_mask don't affect newly child netns[II][ ok ]
rps_default_mask is 0 by default in child netns [ ok ]
changing rps_default_mask in child ns don't affect the main one[ ok ]
changing rps_default_mask in child ns affects new childns devices[ ok ]
changing rps_default_mask in child ns don't affect existing devices[ ok ]
Fixes: 3a7d84eae0 ("self-tests: more rps self tests")
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/20230404072411.879476-1-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
76 lines
2.1 KiB
Bash
Executable File
76 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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readonly ksft_skip=4
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readonly cpus=$(nproc)
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ret=0
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[ $cpus -gt 2 ] || exit $ksft_skip
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readonly INITIAL_RPS_DEFAULT_MASK=$(cat /proc/sys/net/core/rps_default_mask)
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readonly TAG="$(mktemp -u XXXXXX)"
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readonly VETH="veth${TAG}"
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readonly NETNS="ns-${TAG}"
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setup() {
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ip netns add "${NETNS}"
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ip -netns "${NETNS}" link set lo up
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}
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cleanup() {
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echo $INITIAL_RPS_DEFAULT_MASK > /proc/sys/net/core/rps_default_mask
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ip netns del $NETNS
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}
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chk_rps() {
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local rps_mask expected_rps_mask=$4
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local dev_name=$3
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local netns=$2
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local cmd="cat"
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local msg=$1
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[ -n "$netns" ] && cmd="ip netns exec $netns $cmd"
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rps_mask=$($cmd /sys/class/net/$dev_name/queues/rx-0/rps_cpus)
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printf "%-60s" "$msg"
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if [ $rps_mask -eq $expected_rps_mask ]; then
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echo "[ ok ]"
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else
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echo "[fail] expected $expected_rps_mask found $rps_mask"
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ret=1
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fi
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}
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trap cleanup EXIT
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echo 0 > /proc/sys/net/core/rps_default_mask
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setup
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chk_rps "empty rps_default_mask" $NETNS lo 0
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cleanup
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echo 1 > /proc/sys/net/core/rps_default_mask
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setup
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chk_rps "changing rps_default_mask dont affect existing devices" "" lo $INITIAL_RPS_DEFAULT_MASK
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echo 3 > /proc/sys/net/core/rps_default_mask
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chk_rps "changing rps_default_mask dont affect existing netns" $NETNS lo 0
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ip link add name $VETH type veth peer netns $NETNS name $VETH
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ip link set dev $VETH up
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ip -n $NETNS link set dev $VETH up
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chk_rps "changing rps_default_mask affect newly created devices" "" $VETH 3
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chk_rps "changing rps_default_mask don't affect newly child netns[II]" $NETNS $VETH 0
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ip link del dev $VETH
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ip netns del $NETNS
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setup
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chk_rps "rps_default_mask is 0 by default in child netns" "$NETNS" lo 0
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ip netns exec $NETNS sysctl -qw net.core.rps_default_mask=1
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ip link add name $VETH type veth peer netns $NETNS name $VETH
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chk_rps "changing rps_default_mask in child ns don't affect the main one" "" lo $INITIAL_RPS_DEFAULT_MASK
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chk_rps "changing rps_default_mask in child ns affects new childns devices" $NETNS $VETH 1
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chk_rps "changing rps_default_mask in child ns don't affect existing devices" $NETNS lo 0
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exit $ret
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