[dpdk-dev] [PATCH v6 0/4] support reset of VF link

[Luca Boccassi]

On Mon, 2016-06-20 at 14:24 +0800, Wenzhuo Lu wrote:
> If the PF link is down and up, VF link will not work accordingly.
> This patch set addes the support of VF link reset. So, when VF
> receices the messges of physical link down/up. APP can reset the
> VF link and let it recover.
> 
> PS: This patch set is splitted from a previous patch set,
> *automatic link recovery on ixgbe/igb VF*, and it's base on the
> patch set *support mailbox interruption on ixgbe/igb VF*.
> 
> Wenzhuo Lu (3):
>   lib/librte_ether: support device reset
>   ixgbe: implement device reset on VF
>   igb: implement device reset on VF
> 
> Zhe Tao (1):
>   i40e: implement device reset on VF
> 
> v1:
> - Added the implementation for the VF reset functionality.
> v2:
> - Changed the i40e related operations during VF reset.
> v3:
> - Resent the patches because of the mail sent issue.
> v4:
> - Removed some VF reset emulation code.
> v5:
> - Removed all the code related with lock.
> v6:
> - Updated the NIC feature overview matrix.
> - Added more explanation in the doxygen comment of reset API.
> 
>  doc/guides/nics/overview.rst           |  1 +
>  doc/guides/rel_notes/release_16_07.rst | 13 ++++++
>  drivers/net/e1000/igb_ethdev.c         | 59 ++++++++++++++++++++++++
>  drivers/net/i40e/i40e_ethdev.h         |  4 ++
>  drivers/net/i40e/i40e_ethdev_vf.c      | 83 ++++++++++++++++++++++++++++++++++
>  drivers/net/i40e/i40e_rxtx.c           | 10 ++++
>  drivers/net/i40e/i40e_rxtx.h           |  4 ++
>  drivers/net/ixgbe/ixgbe_ethdev.c       | 64 +++++++++++++++++++++++++-
>  drivers/net/ixgbe/ixgbe_ethdev.h       |  2 +-
>  drivers/net/ixgbe/ixgbe_rxtx.c         | 12 +++--
>  lib/librte_ether/rte_ethdev.c          | 17 +++++++
>  lib/librte_ether/rte_ethdev.h          | 24 ++++++++++
>  lib/librte_ether/rte_ether_version.map |  7 +++
>  13 files changed, 295 insertions(+), 5 deletions(-)

Hello Wenzhuo,

I'm testing this patchset, but I am sporadically running into an issue
where the VFs reset fails after the PF flaps.

I have a VM running on a KVM box with a X540-AT2, passing 2 VFs in.

I am using calling rte_eth_dev_reset in response to a
RTE_ETH_EVENT_INTR_RESET callback, and the following errors appear in
the log:

PMD: ixgbevf_dev_reset(): Ixgbe VF reset: Failed to update link.
PMD: ixgbe_alloc_rx_queue_mbufs(): RX mbuf alloc failed queue_id=0
PMD: ixgbevf_dev_start(): Unable to initialize RX hardware (-12)
PMD: ixgbevf_dev_reset(): Ixgbe VF reset: Failed to start device.

Jumping in with GDB, it seems that the rte_rxmbuf_alloc call in
ixgbe_alloc_rx_queue_mbufs returns NULL at iteration 64 out of 2048.
The application has ~500 2MB hugepages, and there's 2GB of free memory
available on top of that.

Have you seen this before? Any pointer or suggestion for debugging?

Thanks!

-- 
Kind regards,
Luca Boccassi