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

[Ciara Loftus]

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: sta...@dpdk.og

Reported-by: Stephen Hemminger <step...@networkplumber.org>
Signed-off-by: Ciara Loftus <ciara.lof...@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