Add support for dev_ops of stats_get and stats_reset.

Queue stats update will be moved into xstat [1], but the basic stats
items may still be required. So we just keep the remaining ones and
will implement the queue stats via xstats in the coming release.

[1]
https://elixir.bootlin.com/dpdk/v22.07/ \
        source/doc/guides/rel_notes/deprecation.rst#L118

Signed-off-by: Xiaoyun Li <xiaoyun...@intel.com>
Signed-off-by: Junfeng Guo <junfeng....@intel.com>
---
 doc/guides/nics/features/gve.ini |  1 +
 drivers/net/gve/gve_ethdev.c     | 60 ++++++++++++++++++++++++++++++++
 drivers/net/gve/gve_ethdev.h     | 11 ++++++
 drivers/net/gve/gve_rx.c         | 15 ++++++--
 drivers/net/gve/gve_tx.c         | 13 +++++++
 5 files changed, 98 insertions(+), 2 deletions(-)

diff --git a/doc/guides/nics/features/gve.ini b/doc/guides/nics/features/gve.ini
index cdc46b08a3..838edd456a 100644
--- a/doc/guides/nics/features/gve.ini
+++ b/doc/guides/nics/features/gve.ini
@@ -10,6 +10,7 @@ MTU update           = Y
 TSO                  = Y
 RSS hash             = Y
 L4 checksum offload  = Y
+Basic stats          = Y
 Linux                = Y
 x86-32               = Y
 x86-64               = Y
diff --git a/drivers/net/gve/gve_ethdev.c b/drivers/net/gve/gve_ethdev.c
index 97781f0ed3..06d1b796c8 100644
--- a/drivers/net/gve/gve_ethdev.c
+++ b/drivers/net/gve/gve_ethdev.c
@@ -319,6 +319,64 @@ gve_dev_info_get(struct rte_eth_dev *dev, struct 
rte_eth_dev_info *dev_info)
        return 0;
 }
 
+static int
+gve_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
+{
+       uint16_t i;
+
+       for (i = 0; i < dev->data->nb_tx_queues; i++) {
+               struct gve_tx_queue *txq = dev->data->tx_queues[i];
+               if (txq == NULL)
+                       continue;
+
+               stats->opackets += txq->packets;
+               stats->obytes += txq->bytes;
+               stats->oerrors += txq->errors;
+       }
+
+       for (i = 0; i < dev->data->nb_rx_queues; i++) {
+               struct gve_rx_queue *rxq = dev->data->rx_queues[i];
+               if (rxq == NULL)
+                       continue;
+
+               stats->ipackets += rxq->packets;
+               stats->ibytes += rxq->bytes;
+               stats->ierrors += rxq->errors;
+               stats->rx_nombuf += rxq->no_mbufs;
+       }
+
+       return 0;
+}
+
+static int
+gve_dev_stats_reset(struct rte_eth_dev *dev)
+{
+       uint16_t i;
+
+       for (i = 0; i < dev->data->nb_tx_queues; i++) {
+               struct gve_tx_queue *txq = dev->data->tx_queues[i];
+               if (txq == NULL)
+                       continue;
+
+               txq->packets  = 0;
+               txq->bytes = 0;
+               txq->errors = 0;
+       }
+
+       for (i = 0; i < dev->data->nb_rx_queues; i++) {
+               struct gve_rx_queue *rxq = dev->data->rx_queues[i];
+               if (rxq == NULL)
+                       continue;
+
+               rxq->packets  = 0;
+               rxq->bytes = 0;
+               rxq->errors = 0;
+               rxq->no_mbufs = 0;
+       }
+
+       return 0;
+}
+
 static int
 gve_dev_mtu_set(struct rte_eth_dev *dev, uint16_t mtu)
 {
@@ -357,6 +415,8 @@ static const struct eth_dev_ops gve_eth_dev_ops = {
        .rx_queue_release     = gve_rx_queue_release,
        .tx_queue_release     = gve_tx_queue_release,
        .link_update          = gve_link_update,
+       .stats_get            = gve_dev_stats_get,
+       .stats_reset          = gve_dev_stats_reset,
        .mtu_set              = gve_dev_mtu_set,
 };
 
diff --git a/drivers/net/gve/gve_ethdev.h b/drivers/net/gve/gve_ethdev.h
index 235e55899e..64e571bcae 100644
--- a/drivers/net/gve/gve_ethdev.h
+++ b/drivers/net/gve/gve_ethdev.h
@@ -92,6 +92,11 @@ struct gve_tx_queue {
        struct gve_queue_page_list *qpl;
        struct gve_tx_iovec *iov_ring;
 
+       /* stats items */
+       uint64_t packets;
+       uint64_t bytes;
+       uint64_t errors;
+
        uint16_t port_id;
        uint16_t queue_id;
 
@@ -130,6 +135,12 @@ struct gve_rx_queue {
        /* only valid for GQI_QPL queue format */
        struct gve_queue_page_list *qpl;
 
+       /* stats items */
+       uint64_t packets;
+       uint64_t bytes;
+       uint64_t errors;
+       uint64_t no_mbufs;
+
        struct gve_priv *hw;
        const struct rte_memzone *qres_mz;
        struct gve_queue_resources *qres;
diff --git a/drivers/net/gve/gve_rx.c b/drivers/net/gve/gve_rx.c
index 518c9d109c..66fbcf3930 100644
--- a/drivers/net/gve/gve_rx.c
+++ b/drivers/net/gve/gve_rx.c
@@ -26,8 +26,10 @@ gve_rx_refill(struct gve_rx_queue *rxq)
                                        break;
                                rxq->sw_ring[idx + i] = nmb;
                        }
-                       if (i != nb_alloc)
+                       if (i != nb_alloc) {
+                               rxq->no_mbufs += nb_alloc - i;
                                nb_alloc = i;
+                       }
                }
                rxq->nb_avail -= nb_alloc;
                next_avail += nb_alloc;
@@ -88,6 +90,7 @@ gve_rx_burst(void *rx_queue, struct rte_mbuf **rx_pkts, 
uint16_t nb_pkts)
        uint16_t rx_id = rxq->rx_tail;
        struct rte_mbuf *rxe;
        uint16_t nb_rx, len;
+       uint64_t bytes = 0;
        uint64_t addr;
        uint16_t i;
 
@@ -99,8 +102,10 @@ gve_rx_burst(void *rx_queue, struct rte_mbuf **rx_pkts, 
uint16_t nb_pkts)
                if (GVE_SEQNO(rxd->flags_seq) != rxq->expected_seqno)
                        break;
 
-               if (rxd->flags_seq & GVE_RXF_ERR)
+               if (rxd->flags_seq & GVE_RXF_ERR) {
+                       rxq->errors++;
                        continue;
+               }
 
                len = rte_be_to_cpu_16(rxd->len) - GVE_RX_PAD;
                rxe = rxq->sw_ring[rx_id];
@@ -135,6 +140,7 @@ gve_rx_burst(void *rx_queue, struct rte_mbuf **rx_pkts, 
uint16_t nb_pkts)
                        rx_id = 0;
 
                rx_pkts[nb_rx] = rxe;
+               bytes += len;
                nb_rx++;
        }
 
@@ -144,6 +150,11 @@ gve_rx_burst(void *rx_queue, struct rte_mbuf **rx_pkts, 
uint16_t nb_pkts)
        if (rxq->nb_avail > rxq->free_thresh)
                gve_rx_refill(rxq);
 
+       if (nb_rx) {
+               rxq->packets += nb_rx;
+               rxq->bytes += bytes;
+       }
+
        return nb_rx;
 }
 
diff --git a/drivers/net/gve/gve_tx.c b/drivers/net/gve/gve_tx.c
index bf4e8fea2c..9b41c59358 100644
--- a/drivers/net/gve/gve_tx.c
+++ b/drivers/net/gve/gve_tx.c
@@ -260,6 +260,7 @@ gve_tx_burst_qpl(void *tx_queue, struct rte_mbuf **tx_pkts, 
uint16_t nb_pkts)
        struct rte_mbuf *tx_pkt, *first;
        uint16_t sw_id = txq->sw_tail;
        uint16_t nb_used, i;
+       uint64_t bytes = 0;
        uint16_t nb_tx = 0;
        uint32_t hlen;
 
@@ -355,6 +356,8 @@ gve_tx_burst_qpl(void *tx_queue, struct rte_mbuf **tx_pkts, 
uint16_t nb_pkts)
                txq->nb_free -= nb_used;
                txq->sw_nb_free -= first->nb_segs;
                tx_tail += nb_used;
+
+               bytes += first->pkt_len;
        }
 
 end_of_tx:
@@ -362,6 +365,10 @@ gve_tx_burst_qpl(void *tx_queue, struct rte_mbuf 
**tx_pkts, uint16_t nb_pkts)
                rte_write32(rte_cpu_to_be_32(tx_tail), txq->qtx_tail);
                txq->tx_tail = tx_tail;
                txq->sw_tail = sw_id;
+
+               txq->packets += nb_tx;
+               txq->bytes += bytes;
+               txq->errors += nb_pkts - nb_tx;
        }
 
        return nb_tx;
@@ -380,6 +387,7 @@ gve_tx_burst_ra(void *tx_queue, struct rte_mbuf **tx_pkts, 
uint16_t nb_pkts)
        struct rte_mbuf *tx_pkt, *first;
        uint16_t nb_used, hlen, i;
        uint64_t ol_flags, addr;
+       uint64_t bytes = 0;
        uint16_t nb_tx = 0;
 
        txr = txq->tx_desc_ring;
@@ -438,12 +446,17 @@ gve_tx_burst_ra(void *tx_queue, struct rte_mbuf 
**tx_pkts, uint16_t nb_pkts)
 
                txq->nb_free -= nb_used;
                tx_tail += nb_used;
+
+               bytes += first->pkt_len;
        }
 
 end_of_tx:
        if (nb_tx) {
                rte_write32(rte_cpu_to_be_32(tx_tail), txq->qtx_tail);
                txq->tx_tail = tx_tail;
+
+               txq->packets += nb_tx;
+               txq->bytes += bytes;
        }
 
        return nb_tx;
-- 
2.34.1

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