[RFC,0/4] ethdev: claim device reset as async
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Message ID 20180808070545.13510-1-qi.z.zhang@intel.com
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  • ethdev: claim device reset as async
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Qi Zhang Aug. 8, 2018, 7:05 a.m. UTC
Device reset may have the dependency, for example, a VF reset expects
PF ready, or a NIC function as a part of a SOC need to wait for other
parts of the system be ready, these are time-consuming tasks and will
block current thread.

So we claimed rte_eth_dev_reset as an async API, that makes things
easy for an application that what to reset the device from the interrupt
thread since typically a RTE_ETH_EVENT_INTR_RESET handler is invoked
in interrupt thread.

PMD is responsrible to implement ops->dev_reset in an async way, it
can offload the whole task into a separate thread, or maybe just pending
on hardware interrupt as reset dependency ready or start a timely alarm
to poll register status as a background daemon. PMD is also
responsible to raise the RTE_ETH_EVENT_RESET_COMPLETE event to notify the
application when reset is complete.

Application should not assume device reset is finished after
rte_eth_dev_reset return, it should always wait for a
RTE_ETH_EVENT_RESET_COMPLETE event and check the reset result.

Qi Zhang (4):
  ethdev: claim device reset as async
  net/i40e: enable async device reset
  net/ixgbe: enable async device reset
  testpmd: enable async device reset

 app/test-pmd/testpmd.c           | 55 +++++++++++++++++++++++++++++++++++++++-
 drivers/net/i40e/i40e_ethdev.c   | 28 ++++++++++++++++----
 drivers/net/ixgbe/ixgbe_ethdev.c | 26 ++++++++++++++-----
 lib/librte_ethdev/rte_ethdev.h   | 33 ++++++++++++------------
 4 files changed, 114 insertions(+), 28 deletions(-)