I built a Xenial test kernel with all the patches from the following
bugs:
bug 1670518
PCI: hv: Allocate physically contiguous hypercall params buffer
PCI: hv: Make unnecessarily global IRQ masking functions static
PCI: hv: Delete the device earlier from hbus->children for hot-remove
PCI: hv: Fix hv_pci_remove() for hot-remove
bug 1672785
net/mlx4_core: Avoid delays during VF driver device shutdown
bug 1667531
tools: hv: Enable network manager for bonding scripts on RH
[net-next] tools: hv: Add clean up function for Ubuntu config
bcc5a76 tools: hv: Add a script to help bonding synthetic and VF NICs
bug 1667527
4a9b0933bdfc PCI: hv: Use device serial number as PCI domain
bug 1667007
d3de209 net/mlx4_core: Use cq quota in SRIOV when creating completion
EQs
bug 1650058
14c84da90b0d net/mlx4_en: Fix bad WQE issue
c46100f413ca net/mlx4_core: Fix racy CQ (Completion Queue) free
f4f73e2e6308 net/mlx4_core: Fix when to save some qp context flags for
dynamic VST to VGT transitions
3c05ac20fe6e net/mlx4_core: Avoid command timeouts during VF driver
device shutdown
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/HyperVCombined/
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https://bugs.launchpad.net/bugs/1672785
Title:
[Hyper-V][Mellanox] net/mlx4_core: Avoid delays during VF driver
device shutdown
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Xenial:
In Progress
Status in linux source package in Zesty:
In Progress
Bug description:
Mellanox has submitted the following patch upstream that's important
for SR-IOV in Azure.
Please integrate it into the Mellanox mlx4 drivers for lts-xenial,
HWE, Zesty, and Azure custom.
https://patchwork.ozlabs.org/patch/738305/
From: Jack Morgenstein <ja...@dev.mellanox.co.il>
Some Hypervisors detach VFs from VMs by instantly causing an FLR event
to be generated for a VF.
In the mlx4 case, this will cause that VF's comm channel to be disabled
before the VM has an opportunity to invoke the VF device's "shutdown"
method.
For such Hypervisors, there is a race condition between the VF's
shutdown method and its internal-error detection/reset thread.
The internal-error detection/reset thread (which runs every 5 seconds) also
detects a disabled comm channel. If the internal-error detection/reset
flow wins the race, we still get delays (while that flow tries repeatedly
to detect comm-channel recovery).
The cited commit fixed the command timeout problem when the
internal-error detection/reset flow loses the race.
This commit avoids the unneeded delays when the internal-error
detection/reset flow wins.
Fixes: d585df1c5ccf ("net/mlx4_core: Avoid command timeouts during VF driver
device shutdown")
Signed-off-by: Jack Morgenstein <ja...@dev.mellanox.co.il>
Reported-by: Simon Xiao <six...@microsoft.com>
Signed-off-by: Tariq Toukan <tar...@mellanox.com>
---
drivers/net/ethernet/mellanox/mlx4/cmd.c | 11 +++++++++++
drivers/net/ethernet/mellanox/mlx4/main.c | 11 +++++++++++
include/linux/mlx4/device.h | 1 +
3 files changed, 23 insertions(+)
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