[dpdk-dev] [PATCH v5 0/4] Support NIC reset and keep same port id

[Wei Dai]

Sometimes a port have to be reset. For example PF is reset, all its
VF should also be reset. After reset, if the port goes
through PCI remove() and then PCI probe() for restoration, its
port id may be changed and this is not expected by some customer
DPDK application.
Normally, PCI probe() includes two parts: one is in rte_ethdev layer
and the other is calling PMD dev_init(). PCI remove( ) release all
resource allocated from rte_ethdev layer in PCI probe( ) and calls
PMD dev_unit( ).
To keep same port id and reset the port, only dev_uninit() and
dev_init( ) in PMD can be called and keep all resources allocated
from rte_ethdev layer poart in PCI probe( ).

New rte_eth_dev_reset( ) calls rte_eth_dev_stop( ), PMD dev_uninit( )
and then PMD dev_init( ) to reset a port and keep same port id.
And then application can go through rte_eth_dev_configure( ),
rte_eth_rx_queue_setup( ), rte_eth_tx_queue_setup( ) and
rte_eth_dev_start( ) again to restore its previous settings or
to reconfigure itself with different settings.

To test this new feature, a testpmd command "port reset port_id" is added.
The mapping between port number and its PCI address can be monitored to
confirm its port number is kept.
And following test case can also be used to confirm the port can work
again after reset.

A typical test steps are listed as follows:
For example, run "ifconfig PF-name down" will trigger a reset to VF.
1.  run testpmd with 2 ixgbe VF ports belonging to same PF
2.  testpmd > set verbose 1 //to observe VF working
3.  testpmd > show port info all //show port number and MAC addr
4.  testpmd > start
5.  let all ports forwarding work for a while
6.  testpmd > show port stats all
7.  ifconfig name-of-PF down
8.  A message is shown in testmd to indicate PF reset
9.  ifconfig name-of-PF up
10. testpmd > stop // stop forwarding to avoid crash during reset
11. testpmd > port reset all
12. testpmd > port stop all
13. testpmd > port start all //recofnig all ports
14. testpmd > show port info all
    //get mapping of port id and MAC addr for forwarding
15. testpmd > start // restore forwarding
14. let all ports forwarding work for a while
15. testpmd > show port stats all //confirm all port can work again
16. repeat above step 7 - 15

chagnes:
v5:
  remove PCI address output to align with other modification which
    will output it in other way
  disable PF reset when its VF is ative to avoid unexpected VF behavior
v4:
  add PCI address to confirm its port number keep same
  correct test method in cover letter
v3:
  update testpmd command
v2:
  only reset PMD layer resource and keep same port id, but
  not restore settings

Signed-off-by: Wei Dai <wei.dai at intel.com>
Tested-by: Yuan Peng <yuan.peng at intel.com>

Wei Dai (4):
  ethdev: add support of NIC reset
  net/ixgbe: add support of reset
  net/i40e: add support of reset
  app/testpmd: enhance command to test NIC reset

 app/test-pmd/cmdline.c                 | 10 +++++---
 app/test-pmd/testpmd.c                 | 44 +++++++++++++++++++++++++++++++---
 app/test-pmd/testpmd.h                 |  1 +
 drivers/net/i40e/i40e_ethdev.c         | 20 ++++++++++++++++
 drivers/net/i40e/i40e_ethdev_vf.c      | 16 +++++++++++++
 drivers/net/ixgbe/ixgbe_ethdev.c       | 42 ++++++++++++++++++++++++++++++++
 lib/librte_ether/rte_ethdev.c          | 16 +++++++++++++
 lib/librte_ether/rte_ethdev.h          | 12 ++++++++++
 lib/librte_ether/rte_ether_version.map |  2 +-
 9 files changed, 156 insertions(+), 7 deletions(-)

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2.7.4