[PATCH] net/i40e: fix incorrect PF Rx bytes
From: Qi Zhang <hidden>
Date: 2017-07-05 03:11:57
Internal Rx packet bytes is over counted, CRC size is be excluded,
that cause incorrect Rx bytes or even negative value.
Fixes: 0bcdc44510ef ("net/i40e: exclude internal packet's byte count")
Cc: stable@dpdk.org
Signed-off-by: Qi Zhang <redacted>
---
drivers/net/i40e/i40e_ethdev.c | 56 ++++++++++++++++++++++++++++++++++--------
drivers/net/i40e/i40e_ethdev.h | 8 +++---
2 files changed, 49 insertions(+), 15 deletions(-)
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 80f8bc5..01eabf0 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c@@ -2391,14 +2391,35 @@ i40e_read_stats_registers(struct i40e_pf *pf, struct i40e_hw *hw) i40e_stat_update_48(hw, I40E_GLV_GORCH(hw->port), I40E_GLV_GORCL(hw->port), pf->offset_loaded, - &pf->internal_rx_bytes_offset, - &pf->internal_rx_bytes); + &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_tx_bytes_offset, - &pf->internal_tx_bytes); + &pf->internal_stats_offset.tx_bytes, + &pf->internal_stats.tx_bytes); + /* Get total internal rx packet count */ + i40e_stat_update_48(hw, I40E_GLV_UPRCH(hw->port), + I40E_GLV_UPRCL(hw->port), + pf->offset_loaded, + &pf->internal_stats_offset.rx_unicast, + &pf->internal_stats.rx_unicast); + i40e_stat_update_48(hw, I40E_GLV_MPRCH(hw->port), + I40E_GLV_MPRCL(hw->port), + pf->offset_loaded, + &pf->internal_stats_offset.rx_multicast, + &pf->internal_stats.rx_multicast); + i40e_stat_update_48(hw, I40E_GLV_BPRCH(hw->port), + I40E_GLV_BPRCL(hw->port), + pf->offset_loaded, + &pf->internal_stats_offset.rx_broadcast, + &pf->internal_stats.rx_broadcast); + + /* exclude CRC size */ + pf->internal_stats.rx_bytes -= (pf->internal_stats.rx_unicast + + pf->internal_stats.rx_multicast + + pf->internal_stats.rx_broadcast) * ETHER_CRC_LEN; /* Get statistics of struct i40e_eth_stats */ i40e_stat_update_48(hw, I40E_GLPRT_GORCH(hw->port),
@@ -2421,7 +2442,17 @@ i40e_read_stats_registers(struct i40e_pf *pf, struct i40e_hw *hw) * so subtract ETHER_CRC_LEN from the byte counter for each rx packet. */ ns->eth.rx_bytes -= (ns->eth.rx_unicast + ns->eth.rx_multicast + - ns->eth.rx_broadcast) * ETHER_CRC_LEN + pf->internal_rx_bytes; + ns->eth.rx_broadcast) * ETHER_CRC_LEN; + + /* Workaround: it is possible I40E_GLV_UPRC[H/L] is updated before + * I40E_GLPRT_GORCH[H/L], so there is a small window that cause negtive + * value. + */ + if (ns->eth.rx_bytes < pf->internal_stats.rx_bytes) + ns->eth.rx_bytes = 0; + /* exlude internal rx bytes */ + else + ns->eth.rx_bytes -= pf->internal_stats.rx_bytes; i40e_stat_update_32(hw, I40E_GLPRT_RDPC(hw->port), pf->offset_loaded, &os->eth.rx_discards,
@@ -2449,7 +2480,14 @@ i40e_read_stats_registers(struct i40e_pf *pf, struct i40e_hw *hw) pf->offset_loaded, &os->eth.tx_broadcast, &ns->eth.tx_broadcast); ns->eth.tx_bytes -= (ns->eth.tx_unicast + ns->eth.tx_multicast + - ns->eth.tx_broadcast) * ETHER_CRC_LEN + pf->internal_tx_bytes; + ns->eth.tx_broadcast) * ETHER_CRC_LEN; + + /* exclude internal tx bytes */ + if (ns->eth.tx_bytes < pf->internal_stats.tx_bytes) + ns->eth.tx_bytes = 0; + else + ns->eth.tx_bytes -= pf->internal_stats.tx_bytes; + /* GLPRT_TEPC not supported */ /* additional port specific stats */
@@ -5241,10 +5279,8 @@ i40e_pf_setup(struct i40e_pf *pf) pf->offset_loaded = FALSE; memset(&pf->stats, 0, sizeof(struct i40e_hw_port_stats)); memset(&pf->stats_offset, 0, sizeof(struct i40e_hw_port_stats)); - pf->internal_rx_bytes = 0; - pf->internal_tx_bytes = 0; - pf->internal_rx_bytes_offset = 0; - pf->internal_tx_bytes_offset = 0; + memset(&pf->internal_stats, 0, sizeof(struct i40e_eth_stats)); + memset(&pf->internal_stats_offset, 0, sizeof(struct i40e_eth_stats)); ret = i40e_pf_get_switch_config(pf); if (ret != I40E_SUCCESS) {
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 07677da..4ff8f49 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h@@ -665,11 +665,9 @@ struct i40e_pf { struct i40e_hw_port_stats stats_offset; struct i40e_hw_port_stats stats; - /* internal packet byte count, it should be excluded from the total */ - uint64_t internal_rx_bytes; - uint64_t internal_tx_bytes; - uint64_t internal_rx_bytes_offset; - uint64_t internal_tx_bytes_offset; + /* internal packet statistics, it should be excluded from the total */ + struct i40e_eth_stats internal_stats_offset; + struct i40e_eth_stats internal_stats; bool offset_loaded; struct rte_eth_dev_data *dev_data; /* Pointer to the device data */
--
2.7.4