+/**
+ * RTE_TABLE_ACTION_TTL
+ */
+static int
+ttl_cfg_check(struct rte_table_action_ttl_config *ttl)
+{
+ if (ttl->drop == 0)
+ return -ENOTSUP;
+
+ return 0;
+}
+
+struct ttl_data {
+ uint32_t n_packets;
+} __attribute__((__packed__));
+
+#define TTL_INIT(data, decrement) \
+ ((data)->n_packets = (decrement) ? 1 : 0)
+
+#define TTL_DEC_GET(data) \
+ ((uint8_t)((data)->n_packets & 1))
+
+#define TTL_STATS_RESET(data) \
+ ((data)->n_packets = ((data)->n_packets & 1))
+
+#define TTL_STATS_READ(data) \
+ ((data)->n_packets >> 1)
+
+#define TTL_STATS_ADD(data, value) \
+ ((data)->n_packets = \
+ (((((data)->n_packets >> 1) + (value)) << 1) | \
+ ((data)->n_packets & 1)))
+
+static int
+ttl_apply(void *data,
+ struct rte_table_action_ttl_params *p)
+{
+ struct ttl_data *d = data;
+
+ TTL_INIT(d, p->decrement);
+
+ return 0;
+}
+
+static __rte_always_inline uint64_t
+pkt_ipv4_work_ttl(struct ipv4_hdr *ip,
+ struct ttl_data *data)
+{
+ uint32_t drop;
+ uint16_t cksum = ip->hdr_checksum;
+ uint8_t ttl = ip->time_to_live;
+ uint8_t ttl_diff = TTL_DEC_GET(data);
+
+ cksum += ttl_diff;
+ ttl -= ttl_diff;
+
+ ip->hdr_checksum = cksum;
+ ip->time_to_live = ttl;
+
+ drop = (ttl == 0) ? 1 : 0;
+ TTL_STATS_ADD(data, drop);
+
+ return drop;
+}
+
+static __rte_always_inline uint64_t
+pkt_ipv6_work_ttl(struct ipv6_hdr *ip,
+ struct ttl_data *data)
+{
+ uint32_t drop;
+ uint8_t ttl = ip->hop_limits;
+ uint8_t ttl_diff = TTL_DEC_GET(data);
+
+ ttl -= ttl_diff;
+
+ ip->hop_limits = ttl;
+
+ drop = (ttl == 0) ? 1 : 0;
+ TTL_STATS_ADD(data, drop);
+
+ return drop;
+}
+