- sfc_warn(sa, "Failed to %s %s mode",
- ((enabled) ? "enable" : "disable"), desc);
+ sfc_warn(sa, "Failed to %s %s mode, rc = %d",
+ ((enabled) ? "enable" : "disable"), desc, rc);
+
+ /*
+ * For promiscuous and all-multicast filters a
+ * permission failure should be reported as an
+ * unsupported filter.
+ */
+ if (rc == EPERM)
+ rc = ENOTSUP;