[PATCH net-next v8 09/10] bng_en: implement netdev_stat_ops

[Vikas Gupta <vikas.gupta@broadcom.com>]

From: Bhargava Marreddy <bhargava.marreddy@broadcom.com>

Implement netdev_stat_ops to provide standardized per-queue
statistics via the Netlink API.

Below is the description of the hardware drop counters:

rx-hw-drop-overruns: Packets dropped by HW due to resource limitations
(e.g., no BDs available in the host ring).
rx-hw-drops: Total packets dropped by HW (sum of overruns and error
drops).
tx-hw-drop-errors: Packets dropped by HW because they were invalid or
malformed.
tx-hw-drops: Total packets dropped by HW (sum of resource limitations
and error drops).

The implementation was verified using the ynl tool:

./tools/net/ynl/pyynl/cli.py --spec \
Documentation/netlink/specs/netdev.yaml --dump qstats-get --json \
'{"ifindex":14, "scope":"queue"}'

[{'ifindex': 14, 'queue-id': 0, 'queue-type': 'rx', 'rx-bytes': 758,
'rx-hw-drop-overruns': 0, 'rx-hw-drops': 0, 'rx-packets': 11},
 {'ifindex': 14, 'queue-id': 1, 'queue-type': 'rx', 'rx-bytes': 0,
'rx-hw-drop-overruns': 0, 'rx-hw-drops': 0, 'rx-packets': 0},
{'ifindex': 14, 'queue-id': 0, 'queue-type': 'tx', 'tx-bytes': 0,
'tx-hw-drop-errors': 0, 'tx-hw-drops': 0, 'tx-packets': 0},
 {'ifindex': 14, 'queue-id': 1, 'queue-type': 'tx', 'tx-bytes': 0,
'tx-hw-drop-errors': 0, 'tx-hw-drops': 0, 'tx-packets': 0},
 {'ifindex': 14, 'queue-id': 2, 'queue-type': 'tx', 'tx-bytes': 810,
'tx-hw-drop-errors': 0, 'tx-hw-drops': 0, 'tx-packets': 10},]

Signed-off-by: Bhargava Marreddy <bhargava.marreddy@broadcom.com>
Reviewed-by: Vikas Gupta <vikas.gupta@broadcom.com>
---
 .../net/ethernet/broadcom/bnge/bnge_netdev.c  | 76 +++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_netdev.c b/drivers/net/ethernet/broadcom/bnge/bnge_netdev.c
index 2513b0907693..fa732b99358e 100644
--- a/drivers/net/ethernet/broadcom/bnge/bnge_netdev.c
+++ b/drivers/net/ethernet/broadcom/bnge/bnge_netdev.c
@@ -3031,6 +3031,81 @@ static int bnge_close(struct net_device *dev)
 	return 0;
 }
 
+static void bnge_get_queue_stats_rx(struct net_device *dev, int i,
+				    struct netdev_queue_stats_rx *stats)
+{
+	struct bnge_net *bn = netdev_priv(dev);
+	struct bnge_nq_ring_info *nqr;
+	u64 *sw;
+
+	if (!bn->bnapi)
+		return;
+
+	nqr = &bn->bnapi[i]->nq_ring;
+	sw = nqr->stats.sw_stats;
+
+	stats->packets = 0;
+	stats->packets += BNGE_GET_RING_STATS64(sw, rx_ucast_pkts);
+	stats->packets += BNGE_GET_RING_STATS64(sw, rx_mcast_pkts);
+	stats->packets += BNGE_GET_RING_STATS64(sw, rx_bcast_pkts);
+
+	stats->bytes = 0;
+	stats->bytes += BNGE_GET_RING_STATS64(sw, rx_ucast_bytes);
+	stats->bytes += BNGE_GET_RING_STATS64(sw, rx_mcast_bytes);
+	stats->bytes += BNGE_GET_RING_STATS64(sw, rx_bcast_bytes);
+
+	stats->hw_drop_overruns = BNGE_GET_RING_STATS64(sw, rx_discard_pkts);
+	stats->hw_drops = BNGE_GET_RING_STATS64(sw, rx_error_pkts) +
+				stats->hw_drop_overruns;
+}
+
+static void bnge_get_queue_stats_tx(struct net_device *dev, int i,
+				    struct netdev_queue_stats_tx *stats)
+{
+	struct bnge_net *bn = netdev_priv(dev);
+	struct bnge_napi *bnapi;
+	u64 *sw;
+
+	if (!bn->tx_ring)
+		return;
+
+	bnapi = bn->tx_ring[bn->tx_ring_map[i]].bnapi;
+	sw = bnapi->nq_ring.stats.sw_stats;
+
+	stats->packets = 0;
+	stats->packets += BNGE_GET_RING_STATS64(sw, tx_ucast_pkts);
+	stats->packets += BNGE_GET_RING_STATS64(sw, tx_mcast_pkts);
+	stats->packets += BNGE_GET_RING_STATS64(sw, tx_bcast_pkts);
+
+	stats->bytes = 0;
+	stats->bytes += BNGE_GET_RING_STATS64(sw, tx_ucast_bytes);
+	stats->bytes += BNGE_GET_RING_STATS64(sw, tx_mcast_bytes);
+	stats->bytes += BNGE_GET_RING_STATS64(sw, tx_bcast_bytes);
+
+	stats->hw_drop_errors = BNGE_GET_RING_STATS64(sw, tx_error_pkts);
+	stats->hw_drops = BNGE_GET_RING_STATS64(sw, tx_discard_pkts) +
+				stats->hw_drop_errors;
+}
+
+static void bnge_get_base_stats(struct net_device *dev,
+				struct netdev_queue_stats_rx *rx,
+				struct netdev_queue_stats_tx *tx)
+{
+	struct bnge_net *bn = netdev_priv(dev);
+
+	rx->packets = bn->net_stats_prev.rx_packets;
+	rx->bytes = bn->net_stats_prev.rx_bytes;
+
+	tx->packets = bn->net_stats_prev.tx_packets;
+	tx->bytes = bn->net_stats_prev.tx_bytes;
+}
+
+static const struct netdev_stat_ops bnge_stat_ops = {
+	.get_queue_stats_rx	= bnge_get_queue_stats_rx,
+	.get_queue_stats_tx	= bnge_get_queue_stats_tx,
+	.get_base_stats		= bnge_get_base_stats,
+};
+
 static const struct net_device_ops bnge_netdev_ops = {
 	.ndo_open		= bnge_open,
 	.ndo_stop		= bnge_close,
@@ -3194,6 +3269,7 @@ int bnge_netdev_alloc(struct bnge_dev *bd, int max_irqs)
 	bd->netdev = netdev;
 
 	netdev->netdev_ops = &bnge_netdev_ops;
+	netdev->stat_ops = &bnge_stat_ops;
 
 	bnge_set_ethtool_ops(netdev);
 
-- 
2.47.1