[v3] add drop statistic for af_packet

  From: Vadim <podovinnikov@protei.ru>

add drop statistic for af_packet

Signed-off-by: Vadim Podovinnikov <podovinnikov@protei.ru>
---
 drivers/net/af_packet/rte_eth_af_packet.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
  

On 11/26/2019 3:47 PM, Vadim Podovinnikov wrote:
> From: Vadim <podovinnikov@protei.ru>
> 
> add drop statistic for af_packet
> 
> Signed-off-by: Vadim Podovinnikov <podovinnikov@protei.ru>
> ---
>  drivers/net/af_packet/rte_eth_af_packet.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c
> index f5806bf42..eee0fbce2 100644
> --- a/drivers/net/af_packet/rte_eth_af_packet.c
> +++ b/drivers/net/af_packet/rte_eth_af_packet.c
> @@ -327,8 +327,10 @@ eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
>  {
>  	unsigned i, imax;
>  	unsigned long rx_total = 0, tx_total = 0, tx_err_total = 0;
> -	unsigned long rx_bytes_total = 0, tx_bytes_total = 0;
> +	unsigned long rx_bytes_total = 0, tx_bytes_total = 0, rx_drop = 0;
>  	const struct pmd_internals *internal = dev->data->dev_private;
> +	socklen_t sock_len = sizeof(struct tpacket_stats);
> +	struct tpacket_stats st;
>  
>  	imax = (internal->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
>  	        internal->nb_queues : RTE_ETHDEV_QUEUE_STAT_CNTRS);
> @@ -337,6 +339,12 @@ eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
>  		igb_stats->q_ibytes[i] = internal->rx_queue[i].rx_bytes;
>  		rx_total += igb_stats->q_ipackets[i];
>  		rx_bytes_total += igb_stats->q_ibytes[i];
> +
> +		memset(&st, 0, sock_len);
> +		int rc = getsockopt(internal->rx_queue[i].sockfd, SOL_PACKET,
> +					PACKET_STATISTICS, &st, &sock_len);
> +		if (rc == 0)
> +			rx_drop += st.tp_drops;

stats values should be preserved until it is reset, in this implementation
'imissed' values are values between two stats calls (since PACKET_STATISTICS
resets the stats after retrieved).

Can you add a field to "struct pkt_rx_queue" to save the dropped packet values
and send the accumulated values in each call?

Also need to add resetting this value in 'eth_stats_reset()'

>  	}
>  
>  	imax = (internal->nb_queues < RTE_ETHDEV_QUEUE_STAT_CNTRS ?
> @@ -349,6 +357,7 @@ eth_stats_get(struct rte_eth_dev *dev, struct rte_eth_stats *igb_stats)
>  		tx_bytes_total += igb_stats->q_obytes[i];
>  	}
>  
> +	igb_stats->imissed = rx_drop;
>  	igb_stats->ipackets = rx_total;
>  	igb_stats->ibytes = rx_bytes_total;
>  	igb_stats->opackets = tx_total;
>