[PATCH 2/3] net/af_xdp: Fix mbuf alloc failed statistic

[Ciara Loftus <ciara.loftus@intel.com>]

Failures to allocate mbufs in the receive path were not being
accounted for in the ethdev statistics. Fix this.

Bugzilla ID: 1429
Fixes: f1debd77efaf ("net/af_xdp: introduce AF_XDP PMD")
cc: stable@dpdk.og

Reported-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Ciara Loftus <ciara.loftus@intel.com>
---
 drivers/net/af_xdp/rte_eth_af_xdp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/af_xdp/rte_eth_af_xdp.c b/drivers/net/af_xdp/rte_eth_af_xdp.c
index fee0d5d5f3..968bbf6d45 100644
--- a/drivers/net/af_xdp/rte_eth_af_xdp.c
+++ b/drivers/net/af_xdp/rte_eth_af_xdp.c
@@ -124,6 +124,7 @@ struct rx_stats {
 	uint64_t rx_pkts;
 	uint64_t rx_bytes;
 	uint64_t rx_dropped;
+	uint64_t alloc_failed;
 };
 
 struct pkt_rx_queue {
@@ -339,6 +340,8 @@ af_xdp_rx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		 * xsk_ring_cons__peek
 		 */
 		rx->cached_cons -= nb_pkts;
+		rxq->stats.alloc_failed += nb_pkts;
+
 		return 0;
 	}
 
@@ -408,6 +411,7 @@ af_xdp_rx_cp(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
 		 * xsk_ring_cons__peek
 		 */
 		rx->cached_cons -= nb_pkts;
+		rxq->stats.alloc_failed += nb_pkts;
 		return 0;
 	}
 
@@ -872,6 +876,7 @@ eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 		stats->ibytes += stats->q_ibytes[i];
 		stats->imissed += rxq->stats.rx_dropped;
 		stats->oerrors += txq->stats.tx_dropped;
+		dev->data->rx_mbuf_alloc_failed += rxq->stats.alloc_failed;
 		fd = process_private->rxq_xsk_fds[i];
 		ret = fd >= 0 ? getsockopt(fd, SOL_XDP, XDP_STATISTICS,
 					   &xdp_stats, &optlen) : -1;
-- 
2.34.1