ratelimit: generate shorter IFB names for phy-based interfaces

Interfaces like phy6g-ap0 can produce overly long IFB device names
(e.g., i-phy6g-ap0), which may exceed kernel name-length limits,
specifically in case of VLANs.
This patch normalizes such interface names by replacing the phy
prefix with p and shortening ap → a, producing more compact
IFB device names (e.g., i-p2g-a0).

Other interfaces continue using their original names.

Signed-off-by: Venkat Chimata <venkat@nearhop.com>

Author: Venkat Chimata

feeds/ucentral/ratelimit/files/usr/bin/ratelimit

@@ -37,7 +37,18 @@ function qdisc_del(iface) {
 }
 
 function ifb_dev(iface) {
-	return "i-" + iface;
+	let ifbname;
+	if (index(iface, 'phy') != -1) {
+		// For interfaces like phy6g-ap0, phy5g-ap0, phy2g-ap0
+		// we replace 'phy' with "p" to confine the ifb name length
+		// and replace 'ap' with 'a' to further shorten it.
+		ifbname = replace(iface, 'phy', 'p');
+		ifbname = replace(ifbname, 'ap', 'a');
+	} else {
+		ifbname = iface;
+	}
+	ifbname = "i-" + ifbname;
+	return ifbname;
 }
 
 function ifb_add(iface, ifbdev) {