[dpdk-dev] i40e: cannot change mtu to enable jumbo frame

[Zhu, Heqing]

Helin is still in Chinese New Year Vacation. Will the below command option help ? 

4.5.9. port config - max-pkt-len
Set the maximum packet length:

testpmd> port config all max-pkt-len (value)
This is equivalent to the --max-pkt-len command-line option.


-----Original Message-----
From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Julien Meunier
Sent: Tuesday, February 9, 2016 9:36 AM
To: Zhang, Helin <helin.zhang at intel.com>; dev at dpdk.org
Subject: [dpdk-dev] i40e: cannot change mtu to enable jumbo frame

Hello Helin,

I tried to send jumbo frames to a i40e card. However, I observed that all frames are dropped. Moreover, set_mtu function is not implemented on i40e PMD.

 > testpmd --log-level 8 --huge-dir=/mnt/huge -n 4 -l 2,18 --socket-mem
1024,1024 -w 0000:02:00.0 -w 0000:02:00.2 -- -i --nb-cores=1
--nb-ports=2 --total-num-mbufs=65536

=============
Configuration
=============

+-----------+          +-------------+
|           |          |             |
| tgen      |          |             |
|           +----------+ port 0      |
|           |          |             |
|           |          |             |
|           |          |             |
|           |          |             |
|           +----------+ port 1      |
|           |          |             |
+-----------+          +-------------+

DPDK: DPDK-v2.2

==========
MTU = 1500
==========
Packet sent from a tgen
 > p = Ether / IP / UDP / Raw(MTU + HDR(Ethernet)- HDR(IP) - HDR(UDP))  > len(p) = 1514

testpmd> start
PMD: i40e_rxd_to_vlan_tci(): Mbuf vlan_tci: 0, vlan_tci_outer: 0
testpmd> stop
Telling cores to stop...
Waiting for lcores to finish...
PMD: i40e_update_vsi_stats(): *** VSI[13] stats start ***
PMD: i40e_update_vsi_stats(): rx_bytes:            1518
PMD: i40e_update_vsi_stats(): rx_unicast:          1
PMD: i40e_update_vsi_stats(): *** VSI[13] stats end ***
PMD: i40e_dev_stats_get(): *** PF stats start ***
PMD: i40e_dev_stats_get(): rx_bytes:            1514
PMD: i40e_dev_stats_get(): rx_unicast:          1
PMD: i40e_dev_stats_get(): rx_unknown_protocol: 1
PMD: i40e_dev_stats_get(): rx_size_1522:             1
PMD: i40e_dev_stats_get(): *** PF stats end ***

   -------------- Forward statistics for port 0  --------------
   RX-packets: 1              RX-dropped: 0             RX-total: 1
   TX-packets: 0              TX-dropped: 0             TX-total: 0
 
----------------------------------------------------------------------------
PMD: i40e_update_vsi_stats(): *** VSI[14] stats start ***
PMD: i40e_update_vsi_stats(): tx_bytes:            1514
PMD: i40e_update_vsi_stats(): tx_unicast:          1
PMD: i40e_update_vsi_stats(): *** VSI[14] stats end ***
PMD: i40e_dev_stats_get(): *** PF stats start ***
PMD: i40e_dev_stats_get(): tx_bytes:            1514
PMD: i40e_dev_stats_get(): tx_unicast:          1
PMD: i40e_dev_stats_get(): tx_size_1522:             1
PMD: i40e_dev_stats_get(): *** PF stats end ***

   -------------- Forward statistics for port 1 --------------
   RX-packets: 0              RX-dropped: 0             RX-total: 0
   TX-packets: 1              TX-dropped: 0             TX-total: 1
 
----------------------------------------------------------------------------

   +++++ Accumulated forward statistics for all ports+++++
   RX-packets: 1              RX-dropped: 0             RX-total: 1
   TX-packets: 1              TX-dropped: 0             TX-total: 1
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

=> OK

==========
MTU = 1600
==========
Packet sent
 > p = Ether / IP / UDP / Raw(MTU + HDR(Ethernet)- HDR(IP) - HDR(UDP))  > len(p) = 1614

testpmd> port config mtu 0 1600
rte_eth_dev_set_mtu: Function not supported Set MTU failed. diag=-95
testpmd> port config mtu 1 1600
rte_eth_dev_set_mtu: Function not supported Set MTU failed. diag=-95
testpmd> start
testpmd> stop
Telling cores to stop...
Waiting for lcores to finish...
PMD: i40e_update_vsi_stats(): *** VSI[13] stats start ***
PMD: i40e_update_vsi_stats(): rx_bytes:            1618
PMD: i40e_update_vsi_stats(): rx_unicast:          1
PMD: i40e_update_vsi_stats(): *** VSI[13] stats end ***
PMD: i40e_dev_stats_get(): *** PF stats start ***
PMD: i40e_dev_stats_get(): rx_bytes:            1614
PMD: i40e_dev_stats_get(): rx_unicast:          1
PMD: i40e_dev_stats_get(): rx_unknown_protocol: 1
PMD: i40e_dev_stats_get(): rx_size_big:              1
PMD: i40e_dev_stats_get(): *** PF stats end ***

   -------------- Forward statistics for port 0  --------------
   RX-packets: 1              RX-dropped: 0             RX-total: 1
   TX-packets: 0              TX-dropped: 0             TX-total: 0
 
----------------------------------------------------------------------------
PMD: i40e_update_vsi_stats(): *** VSI[14] stats start ***
PMD: i40e_update_vsi_stats(): tx_bytes:            0
PMD: i40e_update_vsi_stats(): tx_unicast:          0
PMD: i40e_update_vsi_stats(): *** VSI[14] stats end ***
PMD: i40e_dev_stats_get(): *** PF stats start ***
PMD: i40e_dev_stats_get(): tx_bytes:            0
PMD: i40e_dev_stats_get(): tx_unicast:          0
PMD: i40e_dev_stats_get(): tx_size_big:              0
PMD: i40e_dev_stats_get(): *** PF stats end ***

   -------------- Forward statistics for port 1  --------------
   RX-packets: 0              RX-dropped: 0             RX-total: 0
   TX-packets: 0              TX-dropped: 0             TX-total: 0
 
----------------------------------------------------------------------------

   +++++ Accumulated forward statistics for all ports+++++
   RX-packets: 1              RX-dropped: 0             RX-total: 1
   TX-packets: 0              TX-dropped: 0             TX-total: 0
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Done.

=> Frame correctly received on port 0, but never forwarded or xmit on port 1.

Does a mtu_set function will be developed soon in order to support jumbo frame ?

Regards,

--
Julien MEUNIER
6WIND