Re: [dpdk-dev] [PATCH 08/32] net/ngbe: support basic statistics

[Ferruh Yigit <ferruh.yigit@intel.com>]

On 10/14/2021 3:51 AM, Jiawen Wu wrote:
> On September 16, 2021 12:51 AM, Ferruh Yigit wrote:
>> On 9/8/2021 9:37 AM, Jiawen Wu wrote:
>>> Support to read and clear basic statistics, and configure per-queue
>>> stats counter mapping.
>>>
>>> Signed-off-by: Jiawen Wu <jiawenwu@trustnetic.com>
>>> ---
>>>   doc/guides/nics/features/ngbe.ini  |   2 +
>>>   doc/guides/nics/ngbe.rst           |   1 +
>>>   drivers/net/ngbe/base/ngbe_dummy.h |   5 +
>>>   drivers/net/ngbe/base/ngbe_hw.c    | 101 ++++++++++
>>>   drivers/net/ngbe/base/ngbe_hw.h    |   1 +
>>>   drivers/net/ngbe/base/ngbe_type.h  | 134 +++++++++++++
>>>   drivers/net/ngbe/ngbe_ethdev.c     | 300
>> +++++++++++++++++++++++++++++
>>>   drivers/net/ngbe/ngbe_ethdev.h     |  19 ++
>>>   8 files changed, 563 insertions(+)
>>>
>>
>> <...>
>>
>>> +static int
>>> +ngbe_dev_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats
>>> +*stats) {
>>> +	struct ngbe_hw *hw = ngbe_dev_hw(dev);
>>> +	struct ngbe_hw_stats *hw_stats = NGBE_DEV_STATS(dev);
>>> +	struct ngbe_stat_mappings *stat_mappings =
>>> +			NGBE_DEV_STAT_MAPPINGS(dev);
>>> +	uint32_t i, j;
>>> +
>>> +	ngbe_read_stats_registers(hw, hw_stats);
>>> +
>>> +	if (stats == NULL)
>>> +		return -EINVAL;
>>> +
>>> +	/* Fill out the rte_eth_stats statistics structure */
>>> +	stats->ipackets = hw_stats->rx_packets;
>>> +	stats->ibytes = hw_stats->rx_bytes;
>>> +	stats->opackets = hw_stats->tx_packets;
>>> +	stats->obytes = hw_stats->tx_bytes;
>>> +
>>> +	memset(&stats->q_ipackets, 0, sizeof(stats->q_ipackets));
>>> +	memset(&stats->q_opackets, 0, sizeof(stats->q_opackets));
>>> +	memset(&stats->q_ibytes, 0, sizeof(stats->q_ibytes));
>>> +	memset(&stats->q_obytes, 0, sizeof(stats->q_obytes));
>>> +	memset(&stats->q_errors, 0, sizeof(stats->q_errors));
>>> +	for (i = 0; i < NGBE_MAX_QP; i++) {
>>> +		uint32_t n = i / NB_QMAP_FIELDS_PER_QSM_REG;
>>> +		uint32_t offset = (i % NB_QMAP_FIELDS_PER_QSM_REG) * 8;
>>> +		uint32_t q_map;
>>> +
>>> +		q_map = (stat_mappings->rqsm[n] >> offset)
>>> +				& QMAP_FIELD_RESERVED_BITS_MASK;
>>> +		j = (q_map < RTE_ETHDEV_QUEUE_STAT_CNTRS
>>> +		     ? q_map : q_map % RTE_ETHDEV_QUEUE_STAT_CNTRS);
>>> +		stats->q_ipackets[j] += hw_stats->qp[i].rx_qp_packets;
>>> +		stats->q_ibytes[j] += hw_stats->qp[i].rx_qp_bytes;
>>> +
>>> +		q_map = (stat_mappings->tqsm[n] >> offset)
>>> +				& QMAP_FIELD_RESERVED_BITS_MASK;
>>> +		j = (q_map < RTE_ETHDEV_QUEUE_STAT_CNTRS
>>> +		     ? q_map : q_map % RTE_ETHDEV_QUEUE_STAT_CNTRS);
>>> +		stats->q_opackets[j] += hw_stats->qp[i].tx_qp_packets;
>>> +		stats->q_obytes[j] += hw_stats->qp[i].tx_qp_bytes;
>>> +	}
>>> +
>>> +	/* Rx Errors */
>>> +	stats->imissed  = hw_stats->rx_total_missed_packets +
>>> +			  hw_stats->rx_dma_drop;
>>> +	stats->ierrors  = hw_stats->rx_crc_errors +
>>> +			  hw_stats->rx_mac_short_packet_dropped +
>>> +			  hw_stats->rx_length_errors +
>>> +			  hw_stats->rx_undersize_errors +
>>> +			  hw_stats->rx_oversize_errors +
>>> +			  hw_stats->rx_illegal_byte_errors +
>>> +			  hw_stats->rx_error_bytes +
>>> +			  hw_stats->rx_fragment_errors;
>>> +
>>> +	/* Tx Errors */
>>> +	stats->oerrors  = 0;
>>> +	return 0;
>>
>> You can consider keeping 'stats->rx_nombuf' stats too, this needs to be
>> calculated by driver.
>>
> 
> I see ' stats->rx_nombuf = dev->data->rx_mbuf_alloc_failed' in the function rte_eth_stats_get, before calling stats_get ops.
> Should I write it again here?
> 

You are right, I missed it. Just updating 'rx_mbuf_alloc_failed' is
sufficient.