Public bug reported: 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(+) ** Affects: linux (Ubuntu) Importance: Undecided Status: Confirmed ** Changed in: linux (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1672785 Title: [Hyper-V][Mellanox] net/mlx4_core: Avoid delays during VF driver device shutdown To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1672785/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
