** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Also affects: linux (Ubuntu Cosmic)
Importance: Medium
Status: Triaged
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Triaged
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
** Tags added: bionic cosmic kernel-da-key
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1794110
Title:
MPS (Max Payload Size) is not correctly programmed upon Hot Insertion
NVMe PCIe SSD
Status in The Dell-poweredge project:
New
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Bionic:
Triaged
Status in linux source package in Cosmic:
Triaged
Bug description:
Max Payload Size for the NVMe device is not getting programmed correctly.
The OS is trying to set the device MPS to match Root Port which is greater
than Capability of Device, instead of looking for lowest common denominator.
This is fixed in upstream kernel version 4.19. Below are the commits that fix
the issue.
Please help include them in Ubuntu releases.
PCI: Skip MPS logic for Virtual Functions (VFs)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/pci/probe.c?h=v4.19-rc2&id=3dbe97efe8bf450b183d6dee2305cbc032e6b8a4
PCI: Match Root Port's MPS to endpoint's MPSS as necessary
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/pci/probe.c?h=v4.19-rc2&id=9f0e89359775ee21fe1ea732e34edb52aef5addf
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