[v4] net/i40e: fix incorrect byte counters
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Message ID 20200922073713.28938-1-junyux.jiang@intel.com
State Superseded, archived
Delegated to: Qi Zhang
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  • [v4] net/i40e: fix incorrect byte counters
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Commit Message

Junyu Jiang Sept. 22, 2020, 7:37 a.m. UTC
This patch fixed the issue that rx/tx bytes statistics counters
overflowed on 48 bit limitation by enlarging the limitation.

Fixes: 4861cde46116 ("i40e: new poll mode driver")
Cc: stable@dpdk.org

Signed-off-by: Junyu Jiang <junyux.jiang@intel.com>
---
v4: put reading stats and extending in same function.
v3: create a function to hide the extension inside it.
v2: modify the error code
---
---
 doc/guides/nics/i40e.rst       |  7 ++++
 drivers/net/i40e/i40e_ethdev.c | 66 +++++++++++++++++++++-------------
 drivers/net/i40e/i40e_ethdev.h |  9 +++++
 3 files changed, 57 insertions(+), 25 deletions(-)

Comments

Ferruh Yigit Sept. 22, 2020, 9:06 a.m. UTC | #1
On 9/22/2020 8:37 AM, Junyu Jiang wrote:
> This patch fixed the issue that rx/tx bytes statistics counters
> overflowed on 48 bit limitation by enlarging the limitation.
> 
> Fixes: 4861cde46116 ("i40e: new poll mode driver")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Junyu Jiang <junyux.jiang@intel.com>
> ---
> v4: put reading stats and extending in same function.
> v3: create a function to hide the extension inside it.
> v2: modify the error code
> ---
> ---
>   doc/guides/nics/i40e.rst       |  7 ++++
>   drivers/net/i40e/i40e_ethdev.c | 66 +++++++++++++++++++++-------------
>   drivers/net/i40e/i40e_ethdev.h |  9 +++++
>   3 files changed, 57 insertions(+), 25 deletions(-)
> 
> diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
> index b7430f6c4..4baa58be6 100644
> --- a/doc/guides/nics/i40e.rst
> +++ b/doc/guides/nics/i40e.rst
> @@ -830,3 +830,10 @@ Tx bytes affected by the link status change
>   
>   For firmware versions prior to 6.01 for X710 series and 3.33 for X722 series, the tx_bytes statistics data is affected by
>   the link down event. Each time the link status changes to down, the tx_bytes decreases 110 bytes.
> +
> +RX/TX statistics may be incorrect when register overflowed
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +The rx_bytes/tx_bytes statistics register is 48 bit length. Although this limitation is enlarged to 64 bit length
> +on the software side, but there is no way to detect if the overflow occurred more than once. So rx_bytes/tx_bytes
> +statistics data is correct when statistics are updated at least once between two overflows.

It can be better to move this block next to other know issue related to 
the stats (Incorrect Rx statistics when packet is oversize), apart from 
that:

Reviewed-by: Ferruh Yigit <ferruh.yigit@intel.com>

Patch
diff mbox series

diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index b7430f6c4..4baa58be6 100644
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -830,3 +830,10 @@  Tx bytes affected by the link status change
 
 For firmware versions prior to 6.01 for X710 series and 3.33 for X722 series, the tx_bytes statistics data is affected by
 the link down event. Each time the link status changes to down, the tx_bytes decreases 110 bytes.
+
+RX/TX statistics may be incorrect when register overflowed
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The rx_bytes/tx_bytes statistics register is 48 bit length. Although this limitation is enlarged to 64 bit length
+on the software side, but there is no way to detect if the overflow occurred more than once. So rx_bytes/tx_bytes
+statistics data is correct when statistics are updated at least once between two overflows.
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 563f21d9d..6439baf2f 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -3052,6 +3052,21 @@  i40e_dev_link_update(struct rte_eth_dev *dev,
 	return ret;
 }
 
+static void
+i40e_stat_update_48_in_64(struct i40e_hw *hw, uint32_t hireg,
+			  uint32_t loreg, bool offset_loaded, uint64_t *offset,
+			  uint64_t *stat, uint64_t *prev_stat)
+{
+	i40e_stat_update_48(hw, hireg, loreg, offset_loaded, offset, stat);
+	/* enlarge the limitation when statistics counters overflowed */
+	if (offset_loaded) {
+		if (I40E_RXTX_BYTES_L_48_BIT(*prev_stat) > *stat)
+			*stat += (uint64_t)1 << I40E_48_BIT_WIDTH;
+		*stat += I40E_RXTX_BYTES_H_16_BIT(*prev_stat);
+	}
+	*prev_stat = *stat;
+}
+
 /* Get all the statistics of a VSI */
 void
 i40e_update_vsi_stats(struct i40e_vsi *vsi)
@@ -3061,9 +3076,9 @@  i40e_update_vsi_stats(struct i40e_vsi *vsi)
 	struct i40e_hw *hw = I40E_VSI_TO_HW(vsi);
 	int idx = rte_le_to_cpu_16(vsi->info.stat_counter_idx);
 
-	i40e_stat_update_48(hw, I40E_GLV_GORCH(idx), I40E_GLV_GORCL(idx),
-			    vsi->offset_loaded, &oes->rx_bytes,
-			    &nes->rx_bytes);
+	i40e_stat_update_48_in_64(hw, I40E_GLV_GORCH(idx), I40E_GLV_GORCL(idx),
+				  vsi->offset_loaded, &oes->rx_bytes,
+				  &nes->rx_bytes, &vsi->prev_rx_bytes);
 	i40e_stat_update_48(hw, I40E_GLV_UPRCH(idx), I40E_GLV_UPRCL(idx),
 			    vsi->offset_loaded, &oes->rx_unicast,
 			    &nes->rx_unicast);
@@ -3084,9 +3099,9 @@  i40e_update_vsi_stats(struct i40e_vsi *vsi)
 	i40e_stat_update_32(hw, I40E_GLV_RUPP(idx), vsi->offset_loaded,
 			    &oes->rx_unknown_protocol,
 			    &nes->rx_unknown_protocol);
-	i40e_stat_update_48(hw, I40E_GLV_GOTCH(idx), I40E_GLV_GOTCL(idx),
-			    vsi->offset_loaded, &oes->tx_bytes,
-			    &nes->tx_bytes);
+	i40e_stat_update_48_in_64(hw, I40E_GLV_GOTCH(idx), I40E_GLV_GOTCL(idx),
+				  vsi->offset_loaded, &oes->tx_bytes,
+				  &nes->tx_bytes, &vsi->prev_tx_bytes);
 	i40e_stat_update_48(hw, I40E_GLV_UPTCH(idx), I40E_GLV_UPTCL(idx),
 			    vsi->offset_loaded, &oes->tx_unicast,
 			    &nes->tx_unicast);
@@ -3128,17 +3143,18 @@  i40e_read_stats_registers(struct i40e_pf *pf, struct i40e_hw *hw)
 	struct i40e_hw_port_stats *os = &pf->stats_offset; /* old stats */
 
 	/* Get rx/tx bytes of internal transfer packets */
-	i40e_stat_update_48(hw, I40E_GLV_GORCH(hw->port),
-			I40E_GLV_GORCL(hw->port),
-			pf->offset_loaded,
-			&pf->internal_stats_offset.rx_bytes,
-			&pf->internal_stats.rx_bytes);
-
-	i40e_stat_update_48(hw, I40E_GLV_GOTCH(hw->port),
-			I40E_GLV_GOTCL(hw->port),
-			pf->offset_loaded,
-			&pf->internal_stats_offset.tx_bytes,
-			&pf->internal_stats.tx_bytes);
+	i40e_stat_update_48_in_64(hw, I40E_GLV_GORCH(hw->port),
+				  I40E_GLV_GORCL(hw->port),
+				  pf->offset_loaded,
+				  &pf->internal_stats_offset.rx_bytes,
+				  &pf->internal_stats.rx_bytes,
+				  &pf->internal_prev_rx_bytes);
+	i40e_stat_update_48_in_64(hw, I40E_GLV_GOTCH(hw->port),
+				  I40E_GLV_GOTCL(hw->port),
+				  pf->offset_loaded,
+				  &pf->internal_stats_offset.tx_bytes,
+				  &pf->internal_stats.tx_bytes,
+				  &pf->internal_prev_tx_bytes);
 	/* Get total internal rx packet count */
 	i40e_stat_update_48(hw, I40E_GLV_UPRCH(hw->port),
 			    I40E_GLV_UPRCL(hw->port),
@@ -3178,10 +3194,10 @@  i40e_read_stats_registers(struct i40e_pf *pf, struct i40e_hw *hw)
 		pf->internal_stats.rx_broadcast) * RTE_ETHER_CRC_LEN;
 
 	/* Get statistics of struct i40e_eth_stats */
-	i40e_stat_update_48(hw, I40E_GLPRT_GORCH(hw->port),
-			    I40E_GLPRT_GORCL(hw->port),
-			    pf->offset_loaded, &os->eth.rx_bytes,
-			    &ns->eth.rx_bytes);
+	i40e_stat_update_48_in_64(hw, I40E_GLPRT_GORCH(hw->port),
+				  I40E_GLPRT_GORCL(hw->port),
+				  pf->offset_loaded, &os->eth.rx_bytes,
+				  &ns->eth.rx_bytes, &pf->prev_rx_bytes);
 	i40e_stat_update_48(hw, I40E_GLPRT_UPRCH(hw->port),
 			    I40E_GLPRT_UPRCL(hw->port),
 			    pf->offset_loaded, &os->eth.rx_unicast,
@@ -3236,10 +3252,10 @@  i40e_read_stats_registers(struct i40e_pf *pf, struct i40e_hw *hw)
 			    pf->offset_loaded,
 			    &os->eth.rx_unknown_protocol,
 			    &ns->eth.rx_unknown_protocol);
-	i40e_stat_update_48(hw, I40E_GLPRT_GOTCH(hw->port),
-			    I40E_GLPRT_GOTCL(hw->port),
-			    pf->offset_loaded, &os->eth.tx_bytes,
-			    &ns->eth.tx_bytes);
+	i40e_stat_update_48_in_64(hw, I40E_GLPRT_GOTCH(hw->port),
+				  I40E_GLPRT_GOTCL(hw->port),
+				  pf->offset_loaded, &os->eth.tx_bytes,
+				  &ns->eth.tx_bytes, &pf->prev_tx_bytes);
 	i40e_stat_update_48(hw, I40E_GLPRT_UPTCH(hw->port),
 			    I40E_GLPRT_UPTCL(hw->port),
 			    pf->offset_loaded, &os->eth.tx_unicast,
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 19f821829..1466998aa 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -282,6 +282,9 @@  struct rte_flow {
 #define I40E_ETH_OVERHEAD \
 	(RTE_ETHER_HDR_LEN + RTE_ETHER_CRC_LEN + I40E_VLAN_TAG_SIZE * 2)
 
+#define I40E_RXTX_BYTES_H_16_BIT(bytes) ((bytes) & ~I40E_48_BIT_MASK)
+#define I40E_RXTX_BYTES_L_48_BIT(bytes) ((bytes) & I40E_48_BIT_MASK)
+
 struct i40e_adapter;
 struct rte_pci_driver;
 
@@ -399,6 +402,8 @@  struct i40e_vsi {
 	uint8_t vlan_anti_spoof_on; /* The VLAN anti-spoofing enabled */
 	uint8_t vlan_filter_on; /* The VLAN filter enabled */
 	struct i40e_bw_info bw_info; /* VSI bandwidth information */
+	uint64_t prev_rx_bytes;
+	uint64_t prev_tx_bytes;
 };
 
 struct pool_entry {
@@ -1156,6 +1161,10 @@  struct i40e_pf {
 	uint16_t switch_domain_id;
 
 	struct i40e_vf_msg_cfg vf_msg_cfg;
+	uint64_t prev_rx_bytes;
+	uint64_t prev_tx_bytes;
+	uint64_t internal_prev_rx_bytes;
+	uint64_t internal_prev_tx_bytes;
 };
 
 enum pending_msg {