[dpdk-dev] [dpdk-stable] [PATCH v2] net/i40e: fix incorrect byte counters
Ferruh Yigit
ferruh.yigit at intel.com
Wed Sep 16 14:30:31 CEST 2020
On 9/16/2020 2:51 AM, Junyu Jiang wrote:
> This patch fixed the issue that rx/tx bytes overflowed
"Rx/Tx statistics counters overflowed"?
> on 48 bit limitation by enlarging the limitation.
>
> Fixes: 4861cde46116 ("i40e: new poll mode driver")
> Cc: stable at dpdk.org
>
> Signed-off-by: Junyu Jiang <junyux.jiang at intel.com>
> ---
> drivers/net/i40e/i40e_ethdev.c | 47 ++++++++++++++++++++++++++++++++++
> drivers/net/i40e/i40e_ethdev.h | 9 +++++++
> 2 files changed, 56 insertions(+)
>
> diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
> index 563f21d9d..4d4ea9861 100644
> --- a/drivers/net/i40e/i40e_ethdev.c
> +++ b/drivers/net/i40e/i40e_ethdev.c
> @@ -3073,6 +3073,13 @@ i40e_update_vsi_stats(struct i40e_vsi *vsi)
> i40e_stat_update_48(hw, I40E_GLV_BPRCH(idx), I40E_GLV_BPRCL(idx),
> vsi->offset_loaded, &oes->rx_broadcast,
> &nes->rx_broadcast);
> + /* enlarge the limitation when rx_bytes overflowed */
> + if (vsi->offset_loaded) {
> + if (I40E_RXTX_BYTES_LOW(vsi->old_rx_bytes) > nes->rx_bytes)
> + nes->rx_bytes += (uint64_t)1 << I40E_48_BIT_WIDTH;
> + nes->rx_bytes += I40E_RXTX_BYTES_HIGH(vsi->old_rx_bytes);
> + }
> + vsi->old_rx_bytes = nes->rx_bytes;
Can you please describe this logic? (indeed better to describe it in the
commit log)
'nes->rx_bytes' is diff in the stats register since last read.
'old_rx_bytes' is the previous stats diff.
Why/how "I40E_RXTX_BYTES_LOW(vsi->old_rx_bytes) > nes->rx_bytes" has a
meaning? Isn't this very depends on the read frequency?
I guess I am missing something but please help me understand.
Also can you please confirm the initial value of the
"vsi->offset_loaded" is correct.
<....>
> @@ -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_HIGH(bytes) ((bytes) & ~I40E_48_BIT_MASK)
> +#define I40E_RXTX_BYTES_LOW(bytes) ((bytes) & I40E_48_BIT_MASK)
> +
HIGH/LOW is a little misleading, for 64Bits it sounds like it is getting
low 32 bits and high 32 bits, can you please clarify macro masks out
48/16 bits.
> 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 old_rx_bytes;
> + uint64_t old_tx_bytes;
'prev' seems better naming than 'old', what do you think renaming
'old_rx_bytes' -> 'prev_rx_bytes' (for all variables)?
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