[dpdk-dev] [PATCH 3/5] net/netvsc: exhausting transmit descriptors is not an error

[Stephen Hemminger <stephen@networkplumber.org>]

From: Stephen Hemminger <sthemmin@microsoft.com>

If application sends faster than vswitch can keep up, then the
transmit descriptor pool will be exhausted. This is not a failure
so change the name statistic and don't include it in oerrors.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
---
 drivers/net/netvsc/hn_ethdev.c | 7 +++----
 drivers/net/netvsc/hn_rxtx.c   | 4 ++--
 drivers/net/netvsc/hn_var.h    | 3 +--
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/net/netvsc/hn_ethdev.c b/drivers/net/netvsc/hn_ethdev.c
index 97e4b0da4410..8643e0b3c057 100644
--- a/drivers/net/netvsc/hn_ethdev.c
+++ b/drivers/net/netvsc/hn_ethdev.c
@@ -57,7 +57,7 @@ static const struct hn_xstats_name_off hn_stat_strings[] = {
 	{ "good_packets",           offsetof(struct hn_stats, packets) },
 	{ "good_bytes",             offsetof(struct hn_stats, bytes) },
 	{ "errors",                 offsetof(struct hn_stats, errors) },
-	{ "allocation_failed",      offsetof(struct hn_stats, nomemory) },
+	{ "ring full",              offsetof(struct hn_stats, ring_full) },
 	{ "multicast_packets",      offsetof(struct hn_stats, multicast) },
 	{ "broadcast_packets",      offsetof(struct hn_stats, broadcast) },
 	{ "undersize_packets",      offsetof(struct hn_stats, size_bins[0]) },
@@ -407,7 +407,7 @@ static int hn_dev_stats_get(struct rte_eth_dev *dev,
 
 		stats->opackets += txq->stats.packets;
 		stats->obytes += txq->stats.bytes;
-		stats->oerrors += txq->stats.errors + txq->stats.nomemory;
+		stats->oerrors += txq->stats.errors;
 
 		if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 			stats->q_opackets[i] = txq->stats.packets;
@@ -424,7 +424,7 @@ static int hn_dev_stats_get(struct rte_eth_dev *dev,
 		stats->ipackets += rxq->stats.packets;
 		stats->ibytes += rxq->stats.bytes;
 		stats->ierrors += rxq->stats.errors;
-		stats->imissed += rxq->ring_full;
+		stats->imissed += rxq->stats.ring_full;
 
 		if (i < RTE_ETHDEV_QUEUE_STAT_CNTRS) {
 			stats->q_ipackets[i] = rxq->stats.packets;
@@ -458,7 +458,6 @@ hn_dev_stats_reset(struct rte_eth_dev *dev)
 			continue;
 
 		memset(&rxq->stats, 0, sizeof(struct hn_stats));
-		rxq->ring_full = 0;
 	}
 }
 
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index cb5bc6029ce7..92de5d09e442 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -534,7 +534,7 @@ static void hn_rxpkt(struct hn_rx_queue *rxq, struct hn_rx_bufinfo *rxb,
 	hn_update_packet_stats(&rxq->stats, m);
 
 	if (unlikely(rte_ring_sp_enqueue(rxq->rx_ring, m) != 0)) {
-		++rxq->ring_full;
+		++rxq->stats.ring_full;
 		rte_pktmbuf_free(m);
 	}
 }
@@ -1007,7 +1007,7 @@ static struct hn_txdesc *hn_new_txd(struct hn_data *hv,
 	struct hn_txdesc *txd;
 
 	if (rte_mempool_get(hv->tx_pool, (void **)&txd)) {
-		++txq->stats.nomemory;
+		++txq->stats.ring_full;
 		PMD_TX_LOG(DEBUG, "tx pool exhausted!");
 		return NULL;
 	}
diff --git a/drivers/net/netvsc/hn_var.h b/drivers/net/netvsc/hn_var.h
index f188f6360f79..ff722560d9d9 100644
--- a/drivers/net/netvsc/hn_var.h
+++ b/drivers/net/netvsc/hn_var.h
@@ -39,7 +39,7 @@ struct hn_stats {
 	uint64_t	packets;
 	uint64_t	bytes;
 	uint64_t	errors;
-	uint64_t	nomemory;
+	uint64_t	ring_full;
 	uint64_t	multicast;
 	uint64_t	broadcast;
 	/* Size bins in array as RFC 2819, undersized [0], 64 [1], etc */
@@ -78,7 +78,6 @@ struct hn_rx_queue {
 	uint16_t port_id;
 	uint16_t queue_id;
 	struct hn_stats stats;
-	uint64_t ring_full;
 
 	void *event_buf;
 };
-- 
2.18.0