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#!/bin/sh
# vyos_vf_name - pick a non-colliding VF interface name.
# Called by udev rules for VF devices that still have plain ethN names.
#
# Written as a POSIX shell script so it works in both initramfs (no Python3)
# and the normal rootfs udev context.
#
# Usage: vyos_vf_name <current_ifname>
# Prints the target vf_ethN name to stdout.
set -e
if [ -z "$1" ]; then
exit 1
fi
IFNAME="$1"
LOCK_DIR="/run/udev"
LOCK_PATH="${LOCK_DIR}/vyos_vf_name.lock"
# Already normalized - return as-is.
case "$IFNAME" in
vf_*)
echo "$IFNAME"
exit 0
;;
esac
mkdir -p "$LOCK_DIR"
# Acquire a lock to avoid race conditions when multiple VF devices are being
# renamed concurrently.
LOCK_ACQUIRED=0
I=0
while [ "$I" -lt 200 ]; do
if mkdir "$LOCK_PATH" 2>/dev/null; then
LOCK_ACQUIRED=1
break
fi
I=$((I + 1))
sleep 0.01
done
[ "$LOCK_ACQUIRED" -eq 1 ] || exit 1
cleanup() {
rmdir "$LOCK_PATH" 2>/dev/null || true
}
trap cleanup EXIT INT TERM
# Preferred: preserve the original ethN index when vf_ethN is not yet taken.
case "$IFNAME" in
eth*)
PREFERRED="${IFNAME#eth}"
# Validate it is a pure integer.
case "$PREFERRED" in
*[!0-9]*)
;;
*)
if ! [ -d "/sys/class/net/vf_eth${PREFERRED}" ]; then
echo "vf_eth${PREFERRED}"
exit 0
fi
;;
esac
;;
esac
# Fallback: allocate just above the highest ethN synthetic index present to
# avoid collisions.
MAX=-1
for D in /sys/class/net/eth*; do
[ -d "$D" ] || continue
N="${D##*/eth}"
# Skip if not a pure integer (e.g. no match expands to literal path).
case "$N" in *[!0-9]*) continue;; esac
[ "$N" -gt "$MAX" ] && MAX="$N"
done
IDX=$((MAX + 1))
[ "$IDX" -lt 0 ] && IDX=0
# Skip any indices already occupied by existing vf_ethN interfaces.
while [ -d "/sys/class/net/vf_eth${IDX}" ]; do
IDX=$((IDX + 1))
done
echo "vf_eth${IDX}"
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