SKB_DROP_REASON_SUBSYS_MASK
subsys = u32_get_bits(cb->reason, SKB_DROP_REASON_SUBSYS_MASK);
subsys_reason = cb->reason & ~SKB_DROP_REASON_SUBSYS_MASK;
SKB_DROP_REASON_SUBSYS_MASK) >=
(((__force u32)(result) & SKB_DROP_REASON_SUBSYS_MASK) == ___RX_DROP_UNUSABLE)
#define S(x) [(x) & ~SKB_DROP_REASON_SUBSYS_MASK] = (#x),
if ((reason & SKB_DROP_REASON_SUBSYS_MASK) == __QDISC_DROP_REASON) {