[dpdk-dev] [PATCH 0/7] NIC port restoration

[Wei Dai]

    Sometimes configuration and run time environment in PMD layer of a
running port is changed and the port has to stop all bi-directional
traffic and initialize the port device and restore its configurations
and traffic again. Such this procedure can be regarded as restoration. 
    Some customers found that in some VFN scenario a running port with
i40e VF DPDK PMD has to be restored when the host PF with kernel driver
need to reset the whole PF due to some reasons. For example, i40e HW
may need a reset after reconfiguring a few key registers. Then PF host
needs to Inform all VFs generated by that PF with the event of 'PF
reset'. After VF driver see this event, VF driver needs to restore
the VF port.

    In order to make restoration as a common functionality of all PMD,
based on current implementation of rte_ethdev, most of restoration work
can be done in rte_ethdev layer with the settings stored in data 
structures in rte_ethdev layer. If some settings is not stored in
rte_ethdev after they are configured before, they should be stored for
restoration by adding data structure in rte_ethdev layer. Ethdev should
also add a API like dev_restore( ) for PMD possible specific work in
restoration process.
   The outline of restoration procedure is as follows.
1. rte_eth_dev_stop(port_id);	
2. (*dev->dev_ops->dev_uninit)(dev);
3. (*dev->dev_ops->dev_init)(dev);
4. rte_eth_dev_configure(...);
5. rte_eth_dev_rx_queue_config(...) invoked for all Rx queues.
6. rte_eth_dev_tx_queue_config(...) invoked for all Tx queues;
7. rte_eth_start(port) 
7.1  rte_eth_dev_config_restore(port); // need to be enhanced
8.  (*dev->dev_ops->dev_restore)(dev); // doing PMD specific restoration


Wei Dai (7):
  ethdev: add support of NIC restoration
  ethdev: add support of restoration of queue state
  ethdev: add support of restoration of port status
  ethdev: add support of MTU restoration
  ethdev: add support of restoration of multicast addr
  net/ixgbe: add support of restoration
  net/i40e: add support of restoration

 drivers/net/i40e/i40e_ethdev.c         |   2 +
 drivers/net/i40e/i40e_ethdev_vf.c      |   5 +
 drivers/net/ixgbe/ixgbe_ethdev.c       |   4 +
 lib/librte_ether/rte_ethdev.c          | 280 +++++++++++++++++++++++++++++++--
 lib/librte_ether/rte_ethdev.h          |  45 +++++-
 lib/librte_ether/rte_ether_version.map |   6 +
 6 files changed, 326 insertions(+), 16 deletions(-)

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2.7.4