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selftests: netdevsim: add carrier state consistency test

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This commit adds a test case for netdevsim carrier state consistency.
Specifically, the added test verifies the carrier state during the
following operations:

1. Unlink two netdevsims
2. ifdown one netdevsim, then ifup again
3. Link the netdevsims again
4. ifdown one netdevsim, then ifup again

These steps verifies that the carrier is UP iff two netdevsims are
linked and ifuped.

Signed-off-by: Yohei Kojima <yk@y-koj.net>
Link: https://patch.msgid.link/481e2729e53b6074ebfc0ad85764d8feb244de8c.1767624906.git.yk@y-koj.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Yohei Kojima
2026-01-06 00:17:33 +09:00
committed by Jakub Kicinski
parent d83dddffe1
commit 75df712cdd
1 changed files with 59 additions and 0 deletions
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59
tools/testing/selftests/drivers/net/netdevsim/peer.sh
View File

@@ -52,6 +52,39 @@ cleanup_ns()
ip netns del nssv
}
is_carrier_up()
{
local netns="$1"
local nsim_dev="$2"
test "$(ip netns exec "$netns" \
cat /sys/class/net/"$nsim_dev"/carrier 2>/dev/null)" -eq 1
}
assert_carrier_up()
{
local netns="$1"
local nsim_dev="$2"
if ! is_carrier_up "$netns" "$nsim_dev"; then
echo "$nsim_dev's carrier should be UP, but it isn't"
cleanup_ns
exit 1
fi
}
assert_carrier_down()
{
local netns="$1"
local nsim_dev="$2"
if is_carrier_up "$netns" "$nsim_dev"; then
echo "$nsim_dev's carrier should be DOWN, but it isn't"
cleanup_ns
exit 1
fi
}
###
### Code start
###
@@ -113,6 +146,32 @@ if [ $? -eq 0 ]; then
exit 1
fi
# netdevsim carrier state consistency checking
assert_carrier_up nssv "$NSIM_DEV_1_NAME"
assert_carrier_up nscl "$NSIM_DEV_2_NAME"
echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX" > "$NSIM_DEV_SYS_UNLINK"
assert_carrier_down nssv "$NSIM_DEV_1_NAME"
assert_carrier_down nscl "$NSIM_DEV_2_NAME"
ip netns exec nssv ip link set dev "$NSIM_DEV_1_NAME" down
ip netns exec nssv ip link set dev "$NSIM_DEV_1_NAME" up
assert_carrier_down nssv "$NSIM_DEV_1_NAME"
assert_carrier_down nscl "$NSIM_DEV_2_NAME"
echo "$NSIM_DEV_1_FD:$NSIM_DEV_1_IFIDX $NSIM_DEV_2_FD:$NSIM_DEV_2_IFIDX" > $NSIM_DEV_SYS_LINK
assert_carrier_up nssv "$NSIM_DEV_1_NAME"
assert_carrier_up nscl "$NSIM_DEV_2_NAME"
ip netns exec nssv ip link set dev "$NSIM_DEV_1_NAME" down
ip netns exec nssv ip link set dev "$NSIM_DEV_1_NAME" up
assert_carrier_up nssv "$NSIM_DEV_1_NAME"
assert_carrier_up nscl "$NSIM_DEV_2_NAME"
# send/recv packets
tmp_file=$(mktemp)