[dpdk-dev] [PATCH 1/3] rte_sched: keep track of RED drops

[Stephen Hemminger <stephen@networkplumber.org>]

Add new statistic to keep track of drops due to RED.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/librte_sched/rte_sched.c | 20 ++++++++++++++++----
 lib/librte_sched/rte_sched.h |  8 ++++++++
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c
index d47cfc2..16acd6b 100644
--- a/lib/librte_sched/rte_sched.c
+++ b/lib/librte_sched/rte_sched.c
@@ -1071,7 +1071,9 @@ rte_sched_port_update_subport_stats(struct rte_sched_port *port, uint32_t qindex
 }
 
 static inline void
-rte_sched_port_update_subport_stats_on_drop(struct rte_sched_port *port, uint32_t qindex, struct rte_mbuf *pkt)
+rte_sched_port_update_subport_stats_on_drop(struct rte_sched_port *port,
+					    uint32_t qindex,
+					    struct rte_mbuf *pkt, uint32_t red)
 {
 	struct rte_sched_subport *s = port->subport + (qindex / rte_sched_port_queues_per_subport(port));
 	uint32_t tc_index = (qindex >> 2) & 0x3;
@@ -1079,6 +1081,9 @@ rte_sched_port_update_subport_stats_on_drop(struct rte_sched_port *port, uint32_
 
 	s->stats.n_pkts_tc_dropped[tc_index] += 1;
 	s->stats.n_bytes_tc_dropped[tc_index] += pkt_len;
+#ifdef RTE_SCHED_RED
+	s->stats.n_pkts_red_dropped[tc_index] += red;
+#endif
 }
 
 static inline void
@@ -1092,13 +1097,18 @@ rte_sched_port_update_queue_stats(struct rte_sched_port *port, uint32_t qindex,
 }
 
 static inline void
-rte_sched_port_update_queue_stats_on_drop(struct rte_sched_port *port, uint32_t qindex, struct rte_mbuf *pkt)
+rte_sched_port_update_queue_stats_on_drop(struct rte_sched_port *port,
+					  uint32_t qindex,
+					  struct rte_mbuf *pkt, uint32_t red)
 {
 	struct rte_sched_queue_extra *qe = port->queue_extra + qindex;
 	uint32_t pkt_len = pkt->pkt_len;
 
 	qe->stats.n_pkts_dropped += 1;
 	qe->stats.n_bytes_dropped += pkt_len;
+#ifdef RTE_SCHED_RED
+	qe->stats.n_pkts_red_dropped += red;
+#endif
 }
 
 #endif /* RTE_SCHED_COLLECT_STATS */
@@ -1229,8 +1239,10 @@ rte_sched_port_enqueue_qwa(struct rte_sched_port *port, uint32_t qindex,
 		     (qlen >= qsize))) {
 		rte_pktmbuf_free(pkt);
 #ifdef RTE_SCHED_COLLECT_STATS
-		rte_sched_port_update_subport_stats_on_drop(port, qindex, pkt);
-		rte_sched_port_update_queue_stats_on_drop(port, qindex, pkt);
+		rte_sched_port_update_subport_stats_on_drop(port, qindex, pkt,
+							    qlen < qsize);
+		rte_sched_port_update_queue_stats_on_drop(port, qindex, pkt,
+							  qlen < qsize);
 #endif
 		return 0;
 	}
diff --git a/lib/librte_sched/rte_sched.h b/lib/librte_sched/rte_sched.h
index c0f4ad3..e9c2817 100644
--- a/lib/librte_sched/rte_sched.h
+++ b/lib/librte_sched/rte_sched.h
@@ -162,6 +162,11 @@ struct rte_sched_subport_stats {
 	/**< Number of bytes successfully written for each traffic class */
 	uint32_t n_bytes_tc_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
 	/**< Number of bytes dropped for each traffic class */
+
+#ifdef RTE_SCHED_RED
+	uint32_t n_pkts_red_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
+	/**< Number of packets dropped by red */
+#endif
 };
 
 /*
@@ -196,6 +201,9 @@ struct rte_sched_queue_stats {
 	/* Packets */
 	uint32_t n_pkts;                 /**< Packets successfully written */
 	uint32_t n_pkts_dropped;         /**< Packets dropped */
+#ifdef RTE_SCHED_RED
+	uint32_t n_pkts_red_dropped;	 /**< Packets dropped by RED */
+#endif
 
 	/* Bytes */
 	uint32_t n_bytes;                /**< Bytes successfully written */
-- 
2.1.4