[dpdk-dev] [PATCH 1/2] net/i40e: fix clear xstats bug in vf port

[Wei Zhao <wei.zhao1@intel.com>]

There is a bug in vf clear xstats command, it do not
record the statics data in offset struct member.So, vf
need to keep record of xstats data from pf and update
the statics according to offset.

Fixes: da61cd0849766 ("i40evf: add extended stats")

Signed-off-by: Wei Zhao <wei.zhao1@intel.com>
---
 app/test-pmd/config.c             |  6 ++--
 drivers/net/i40e/i40e_ethdev_vf.c | 67 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/app/test-pmd/config.c b/app/test-pmd/config.c
index 3ae3e1c..14131d6 100644
--- a/app/test-pmd/config.c
+++ b/app/test-pmd/config.c
@@ -203,8 +203,10 @@ nic_stats_display(portid_t port_id)
 	if (diff_cycles > 0)
 		diff_cycles = prev_cycles[port_id] - diff_cycles;
 
-	diff_pkts_rx = stats.ipackets - prev_pkts_rx[port_id];
-	diff_pkts_tx = stats.opackets - prev_pkts_tx[port_id];
+	diff_pkts_rx = (stats.ipackets > prev_pkts_rx[port_id]) ?
+		(stats.ipackets - prev_pkts_rx[port_id]) : 0;
+	diff_pkts_tx = (stats.opackets > prev_pkts_tx[port_id]) ?
+		(stats.opackets - prev_pkts_tx[port_id]) : 0;
 	prev_pkts_rx[port_id] = stats.ipackets;
 	prev_pkts_tx[port_id] = stats.opackets;
 	mpps_rx = diff_cycles > 0 ?
diff --git a/drivers/net/i40e/i40e_ethdev_vf.c b/drivers/net/i40e/i40e_ethdev_vf.c
index f6d8293..cded04a 100644
--- a/drivers/net/i40e/i40e_ethdev_vf.c
+++ b/drivers/net/i40e/i40e_ethdev_vf.c
@@ -993,16 +993,77 @@ i40evf_update_stats(struct rte_eth_dev *dev, struct i40e_eth_stats **pstats)
 	return 0;
 }
 
+static void
+i40evf_stat_update_48(uint64_t *offset,
+		   uint64_t *stat)
+{
+
+	if (*stat >= *offset)
+		*stat = *stat - *offset;
+	else
+		*stat = (uint64_t)((*stat +
+			((uint64_t)1 << I40E_48_BIT_WIDTH)) - *offset);
+
+	*stat &= I40E_48_BIT_MASK;
+}
+
+static void
+i40evf_stat_update_32(uint64_t *offset,
+		   uint64_t *stat)
+{
+
+	if (*stat >= *offset)
+		*stat = (uint64_t)(*stat - *offset);
+	else
+		*stat = (uint64_t)((*stat +
+			((uint64_t)1 << I40E_32_BIT_WIDTH)) - *offset);
+}
+
+static void
+i40evf_update_vsi_stats(struct i40e_vsi *vsi,
+					struct i40e_eth_stats *nes)
+{
+	struct i40e_eth_stats *oes = &vsi->eth_stats_offset;
+
+	i40evf_stat_update_48(&oes->rx_bytes,
+			    &nes->rx_bytes);
+	i40evf_stat_update_48(&oes->rx_unicast,
+			    &nes->rx_unicast);
+	i40evf_stat_update_48(&oes->rx_multicast,
+			    &nes->rx_multicast);
+	i40evf_stat_update_48(&oes->rx_broadcast,
+			    &nes->rx_broadcast);
+	i40evf_stat_update_32(&oes->rx_discards,
+				&nes->rx_discards);
+	i40evf_stat_update_32(&oes->rx_unknown_protocol,
+			    &nes->rx_unknown_protocol);
+	i40evf_stat_update_48(&oes->tx_bytes,
+			    &nes->tx_bytes);
+	i40evf_stat_update_48(&oes->tx_unicast,
+			    &nes->tx_unicast);
+	i40evf_stat_update_48(&oes->tx_multicast,
+			    &nes->tx_multicast);
+	i40evf_stat_update_48(&oes->tx_broadcast,
+			    &nes->tx_broadcast);
+	i40evf_stat_update_32(&oes->tx_errors, &nes->tx_errors);
+	i40evf_stat_update_32(&oes->tx_discards, &nes->tx_discards);
+
+}
+
 static int
 i40evf_get_statistics(struct rte_eth_dev *dev, struct rte_eth_stats *stats)
 {
 	int ret;
 	struct i40e_eth_stats *pstats = NULL;
+	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+	struct i40e_vsi *vsi = &vf->vsi;
 
 	ret = i40evf_update_stats(dev, &pstats);
 	if (ret != 0)
 		return 0;
 
+	i40evf_update_vsi_stats(vsi, pstats);
+
 	stats->ipackets = pstats->rx_unicast + pstats->rx_multicast +
 						pstats->rx_broadcast;
 	stats->opackets = pstats->tx_broadcast + pstats->tx_multicast +
@@ -1025,7 +1086,7 @@ i40evf_dev_xstats_reset(struct rte_eth_dev *dev)
 	i40evf_update_stats(dev, &pstats);
 
 	/* set stats offset base on current values */
-	vf->vsi.eth_stats_offset = vf->vsi.eth_stats;
+	vf->vsi.eth_stats_offset = *pstats;
 }
 
 static int i40evf_dev_xstats_get_names(__rte_unused struct rte_eth_dev *dev,
@@ -1049,6 +1110,8 @@ static int i40evf_dev_xstats_get(struct rte_eth_dev *dev,
 	int ret;
 	unsigned i;
 	struct i40e_eth_stats *pstats = NULL;
+	struct i40e_vf *vf = I40EVF_DEV_PRIVATE_TO_VF(dev->data->dev_private);
+	struct i40e_vsi *vsi = &vf->vsi;
 
 	if (n < I40EVF_NB_XSTATS)
 		return I40EVF_NB_XSTATS;
@@ -1060,6 +1123,8 @@ static int i40evf_dev_xstats_get(struct rte_eth_dev *dev,
 	if (!xstats)
 		return 0;
 
+	i40evf_update_vsi_stats(vsi, pstats);
+
 	/* loop over xstats array and values from pstats */
 	for (i = 0; i < I40EVF_NB_XSTATS; i++) {
 		xstats[i].id = i;
-- 
2.9.3