Public bug reported: The QAT is a PCIe device which supports SR-IOV. It is used to accelerate the crypto and compression operations by hardware.
There is additional info for this hardware on the Intel website: https://www.intel.com/content/www/us/en/products/docs/network-io/ethernet/10-25-40-gigabit-adapters/quickassist-adapter-for-servers.html https://01.org/intel-quick-assist-technology On Ubuntu, when the QAT device is enabled with SR-IOV, one device will have 16 VFs. When we assign the VDEV to Linux VM, sometimes, it will fail but sometimes it will not. This issue was debugged and is resolved by applying three patches and removing some buggy code that was added as SAUCE. The following three patches are needed: f73f8a504e27 PCI: hv: Use bytes 4 and 5 from instance ID as the PCI domain numbers be700103efd1 PCI: hv: Detect and fix Hyper-V PCI domain number collision 6ae91579061c PCI: hv: Add __aligned(8) to struct retarget_msi_interrupt Also, revert the patch Revert "PCI: hv: Make sure the bus domain is really unique", i.e. the line "if (list_empty(&hbus->children)) hbus->sysdata.domain = desc->ser" in new_pcichild_device() should be completely removed. The patch “UBUNTU: SAUCE: pci-hyperv: Use only 16 bit integer for PCI domai” is also pointless now. ** Affects: linux-azure (Ubuntu) Importance: Undecided Status: New ** Summary changed: - Assignment of VDEV Sometimes Fails + Assignment of VDEV Somtimes Fails using Intel QAT -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1867220 Title: Assignment of VDEV Somtimes Fails using Intel QAT To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1867220/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
