[dpdk-dev] i40e: problem with rx packet drops not accounted in statistics

Zhang, Helin helin.zhang at intel.com
Thu Sep 10 03:09:43 CEST 2015


Hi Martin

Yes, the statistics issue has been reported several times recently.
We will check the issue and try to fix it or get a workaround soon. Thank you very much!

Regards,
Helin

> -----Original Message-----
> From: Martin Weiser [mailto:martin.weiser at allegro-packets.com]
> Sent: Wednesday, September 9, 2015 7:58 PM
> To: Zhang, Helin
> Cc: dev at dpdk.org
> Subject: i40e: problem with rx packet drops not accounted in statistics
> 
> Hi Helin,
> 
> in one of our test setups involving i40e adapters we are experiencing packet
> drops which are not reflected in the interfaces statistics.
> The call to rte_eth_stats_get suggests that all packets were properly received
> but the total number of packets received through rte_eth_rx_burst is less than
> the ipackets counter.
> When for example running the l2fwd application (l2fwd -c 0xfe -n 4 -- -p
> 0x3) and having driver debug messages enabled the following output is
> generated for the interface in question:
> 
> ...
> PMD: i40e_update_vsi_stats(): ***************** VSI[6] stats start
> *******************
> PMD: i40e_update_vsi_stats(): rx_bytes:            242624340000
> PMD: i40e_update_vsi_stats(): rx_unicast:          167790000
> PMD: i40e_update_vsi_stats(): rx_multicast:        0
> PMD: i40e_update_vsi_stats(): rx_broadcast:        0
> PMD: i40e_update_vsi_stats(): rx_discards:         1192557
> PMD: i40e_update_vsi_stats(): rx_unknown_protocol: 0
> PMD: i40e_update_vsi_stats(): tx_bytes:            0
> PMD: i40e_update_vsi_stats(): tx_unicast:          0
> PMD: i40e_update_vsi_stats(): tx_multicast:        0
> PMD: i40e_update_vsi_stats(): tx_broadcast:        0
> PMD: i40e_update_vsi_stats(): tx_discards:         0
> PMD: i40e_update_vsi_stats(): tx_errors:           0
> PMD: i40e_update_vsi_stats(): ***************** VSI[6] stats end
> *******************
> PMD: i40e_dev_stats_get(): ***************** PF stats start
> *******************
> PMD: i40e_dev_stats_get(): rx_bytes:            242624340000
> PMD: i40e_dev_stats_get(): rx_unicast:          167790000
> PMD: i40e_dev_stats_get(): rx_multicast:        0
> PMD: i40e_dev_stats_get(): rx_broadcast:        0
> PMD: i40e_dev_stats_get(): rx_discards:         0
> PMD: i40e_dev_stats_get(): rx_unknown_protocol: 167790000
> PMD: i40e_dev_stats_get(): tx_bytes:            0
> PMD: i40e_dev_stats_get(): tx_unicast:          0
> PMD: i40e_dev_stats_get(): tx_multicast:        0
> PMD: i40e_dev_stats_get(): tx_broadcast:        0
> PMD: i40e_dev_stats_get(): tx_discards:         0
> PMD: i40e_dev_stats_get(): tx_errors:           0
> PMD: i40e_dev_stats_get(): tx_dropped_link_down:     0
> PMD: i40e_dev_stats_get(): crc_errors:               0
> PMD: i40e_dev_stats_get(): illegal_bytes:            0
> PMD: i40e_dev_stats_get(): error_bytes:              0
> PMD: i40e_dev_stats_get(): mac_local_faults:         1
> PMD: i40e_dev_stats_get(): mac_remote_faults:        1
> PMD: i40e_dev_stats_get(): rx_length_errors:         0
> PMD: i40e_dev_stats_get(): link_xon_rx:              0
> PMD: i40e_dev_stats_get(): link_xoff_rx:             0
> PMD: i40e_dev_stats_get(): priority_xon_rx[0]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[0]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[1]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[1]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[2]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[2]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[3]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[3]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[4]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[4]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[5]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[5]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[6]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[6]:     0
> PMD: i40e_dev_stats_get(): priority_xon_rx[7]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_rx[7]:     0
> PMD: i40e_dev_stats_get(): link_xon_tx:              0
> PMD: i40e_dev_stats_get(): link_xoff_tx:             0
> PMD: i40e_dev_stats_get(): priority_xon_tx[0]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[0]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[0]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[1]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[1]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[1]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[2]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[2]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[2]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[3]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[3]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[3]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[4]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[4]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[4]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[5]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[5]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[5]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[6]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[6]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[6]:  0
> PMD: i40e_dev_stats_get(): priority_xon_tx[7]:      0
> PMD: i40e_dev_stats_get(): priority_xoff_tx[7]:     0
> PMD: i40e_dev_stats_get(): priority_xon_2_xoff[7]:  0
> PMD: i40e_dev_stats_get(): rx_size_64:               0
> PMD: i40e_dev_stats_get(): rx_size_127:              0
> PMD: i40e_dev_stats_get(): rx_size_255:              0
> PMD: i40e_dev_stats_get(): rx_size_511:              0
> PMD: i40e_dev_stats_get(): rx_size_1023:             0
> PMD: i40e_dev_stats_get(): rx_size_1522:             167790000
> PMD: i40e_dev_stats_get(): rx_size_big:              0
> PMD: i40e_dev_stats_get(): rx_undersize:             0
> PMD: i40e_dev_stats_get(): rx_fragments:             0
> PMD: i40e_dev_stats_get(): rx_oversize:              0
> PMD: i40e_dev_stats_get(): rx_jabber:                0
> PMD: i40e_dev_stats_get(): tx_size_64:               0
> PMD: i40e_dev_stats_get(): tx_size_127:              0
> PMD: i40e_dev_stats_get(): tx_size_255:              0
> PMD: i40e_dev_stats_get(): tx_size_511:              0
> PMD: i40e_dev_stats_get(): tx_size_1023:             0
> PMD: i40e_dev_stats_get(): tx_size_1522:             0
> PMD: i40e_dev_stats_get(): tx_size_big:              0
> PMD: i40e_dev_stats_get(): mac_short_packet_dropped: 0
> PMD: i40e_dev_stats_get(): checksum_error:           0
> PMD: i40e_dev_stats_get(): fdir_match:               0
> PMD: i40e_dev_stats_get(): ***************** PF stats end
> ********************
> ...
> 
> The count for rx_unicast is exactly the number of packets we would have
> expected and the count for rx_discards in the VSI stats is exactly the number of
> packets we are missing.
> The question is why this number shows up only in the VSI stats and not in the PF
> stats and of course why the packets which were obviously discarded are still
> counted in the rx_unicast stats.
> This test was performed using DPDK 2.1 and the firmware of the XL710 is the
> latest one (FW 4.40 API 1.4 NVM 04.05.03).
> Do you have an idea what might be going on?
> 
> Best regards,
> Martin
> 
> 



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