[dpdk-dev] [PATCH v3] net/ice: fix incorrect Rx/Tx bytes statistics

[Junyu Jiang <junyux.jiang@intel.com>]

This patch fixed the issue that rx/tx bytes overflowed
on 40 bit limitation by enlarging the limitation.

Fixes: a37bde56314d ("net/ice: support statistics")
Cc: stable@dpdk.org

Signed-off-by: Junyu Jiang <junyux.jiang@intel.com>
---
 drivers/net/ice/ice_ethdev.c | 28 ++++++++++++++++++++++++++++
 drivers/net/ice/ice_ethdev.h |  7 +++++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c
index 3534d18ca..950c27094 100644
--- a/drivers/net/ice/ice_ethdev.c
+++ b/drivers/net/ice/ice_ethdev.c
@@ -4156,6 +4156,13 @@ ice_update_vsi_stats(struct ice_vsi *vsi)
 	ice_stat_update_40(hw, GLV_BPRCH(idx), GLV_BPRCL(idx),
 			   vsi->offset_loaded, &oes->rx_broadcast,
 			   &nes->rx_broadcast);
+	/* enlarge the limitation when rx_bytes overflowed */
+	if (vsi->offset_loaded) {
+		if (ICE_RXTX_BYTES_LOW(vsi->old_rx_bytes) > nes->rx_bytes)
+			nes->rx_bytes += (uint64_t)1 << ICE_40_BIT_WIDTH;
+		nes->rx_bytes += ICE_RXTX_BYTES_HIGH(vsi->old_rx_bytes);
+	}
+	vsi->old_rx_bytes = nes->rx_bytes;
 	/* exclude CRC bytes */
 	nes->rx_bytes -= (nes->rx_unicast + nes->rx_multicast +
 			  nes->rx_broadcast) * RTE_ETHER_CRC_LEN;
@@ -4182,6 +4189,13 @@ ice_update_vsi_stats(struct ice_vsi *vsi)
 	/* GLV_TDPC not supported */
 	ice_stat_update_32(hw, GLV_TEPC(idx), vsi->offset_loaded,
 			   &oes->tx_errors, &nes->tx_errors);
+	/* enlarge the limitation when tx_bytes overflowed */
+	if (vsi->offset_loaded) {
+		if (ICE_RXTX_BYTES_LOW(vsi->old_tx_bytes) > nes->tx_bytes)
+			nes->tx_bytes += (uint64_t)1 << ICE_40_BIT_WIDTH;
+		nes->tx_bytes += ICE_RXTX_BYTES_HIGH(vsi->old_tx_bytes);
+	}
+	vsi->old_tx_bytes = nes->tx_bytes;
 	vsi->offset_loaded = true;
 
 	PMD_DRV_LOG(DEBUG, "************** VSI[%u] stats start **************",
@@ -4229,6 +4243,13 @@ ice_read_stats_registers(struct ice_pf *pf, struct ice_hw *hw)
 	ice_stat_update_32(hw, PRTRPB_RDPC,
 			   pf->offset_loaded, &os->eth.rx_discards,
 			   &ns->eth.rx_discards);
+	/* enlarge the limitation when rx_bytes overflowed */
+	if (pf->offset_loaded) {
+		if (ICE_RXTX_BYTES_LOW(pf->old_rx_bytes) > ns->eth.rx_bytes)
+			ns->eth.rx_bytes += (uint64_t)1 << ICE_40_BIT_WIDTH;
+		ns->eth.rx_bytes += ICE_RXTX_BYTES_HIGH(pf->old_rx_bytes);
+	}
+	pf->old_rx_bytes = ns->eth.rx_bytes;
 
 	/* Workaround: CRC size should not be included in byte statistics,
 	 * so subtract RTE_ETHER_CRC_LEN from the byte counter for each rx
@@ -4259,6 +4280,13 @@ ice_read_stats_registers(struct ice_pf *pf, struct ice_hw *hw)
 			   GLPRT_BPTCL(hw->port_info->lport),
 			   pf->offset_loaded, &os->eth.tx_broadcast,
 			   &ns->eth.tx_broadcast);
+	/* enlarge the limitation when tx_bytes overflowed */
+	if (pf->offset_loaded) {
+		if (ICE_RXTX_BYTES_LOW(pf->old_tx_bytes) > ns->eth.tx_bytes)
+			ns->eth.tx_bytes += (uint64_t)1 << ICE_40_BIT_WIDTH;
+		ns->eth.tx_bytes += ICE_RXTX_BYTES_HIGH(pf->old_tx_bytes);
+	}
+	pf->old_tx_bytes = ns->eth.tx_bytes;
 	ns->eth.tx_bytes -= (ns->eth.tx_unicast + ns->eth.tx_multicast +
 			     ns->eth.tx_broadcast) * RTE_ETHER_CRC_LEN;
 
diff --git a/drivers/net/ice/ice_ethdev.h b/drivers/net/ice/ice_ethdev.h
index 2bff735ca..87984ef9e 100644
--- a/drivers/net/ice/ice_ethdev.h
+++ b/drivers/net/ice/ice_ethdev.h
@@ -133,6 +133,9 @@
 #define ICE_ETH_OVERHEAD \
 	(RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + ICE_VLAN_TAG_SIZE * 2)
 
+#define ICE_RXTX_BYTES_HIGH(bytes) ((bytes) & ~ICE_40_BIT_MASK)
+#define ICE_RXTX_BYTES_LOW(bytes) ((bytes) & ICE_40_BIT_MASK)
+
 /* DDP package type */
 enum ice_pkg_type {
 	ICE_PKG_TYPE_UNKNOWN,
@@ -248,6 +251,8 @@ struct ice_vsi {
 	struct ice_eth_stats eth_stats_offset;
 	struct ice_eth_stats eth_stats;
 	bool offset_loaded;
+	uint64_t old_rx_bytes;
+	uint64_t old_tx_bytes;
 };
 
 enum proto_xtr_type {
@@ -391,6 +396,8 @@ struct ice_pf {
 	struct ice_parser_list perm_parser_list;
 	struct ice_parser_list dist_parser_list;
 	bool init_link_up;
+	uint64_t old_rx_bytes;
+	uint64_t old_tx_bytes;
 };
 
 #define ICE_MAX_QUEUE_NUM  2048
-- 
2.17.1