lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Tue,  1 Dec 2020 18:53:12 -0600
From:   Tyrel Datwyler <>
Cc:,,,,, Tyrel Datwyler <>
Subject: [PATCH v2 00/17] ibmvfc: initial MQ development

Recent updates in pHyp Firmware and VIOS releases provide new infrastructure
towards enabling Subordinate Command Response Queues (Sub-CRQs) such that each
Sub-CRQ is a channel backed by an actual hardware queue in the FC stack on the
partner VIOS. Sub-CRQs are registered with the firmware via hypercalls and then
negotiated with the VIOS via new Management Datagrams (MADs) for channel setup.

This initial implementation adds the necessary Sub-CRQ framework and implements
the new MADs for negotiating and assigning a set of Sub-CRQs to associated VIOS
HW backed channels. The event pool and locking still leverages the legacy single
queue implementation, and as such lock contention is problematic when increasing
the number of queues. However, this initial work demonstrates a 1.2x factor
increase in IOPs when configured with two HW queues despite lock contention.

changes in v2:
* Patch 4: NULL'd scsi_scrq reference after deallocation [brking]
* Patch 6: Added switch case to handle XPORT event [brking]
* Patch 9: fixed ibmvfc_event leak and double free [brking]
* added support for cancel command with MQ
* added parameter toggles for MQ settings

Tyrel Datwyler (17):
  ibmvfc: add vhost fields and defaults for MQ enablement
  ibmvfc: define hcall wrapper for registering a Sub-CRQ
  ibmvfc: add Subordinate CRQ definitions
  ibmvfc: add alloc/dealloc routines for SCSI Sub-CRQ Channels
  ibmvfc: add Sub-CRQ IRQ enable/disable routine
  ibmvfc: add handlers to drain and complete Sub-CRQ responses
  ibmvfc: define Sub-CRQ interrupt handler routine
  ibmvfc: map/request irq and register Sub-CRQ interrupt handler
  ibmvfc: implement channel enquiry and setup commands
  ibmvfc: advertise client support for using hardware channels
  ibmvfc: set and track hw queue in ibmvfc_event struct
  ibmvfc: send commands down HW Sub-CRQ when channelized
  ibmvfc: register Sub-CRQ handles with VIOS during channel setup
  ibmvfc: add cancel mad initialization helper
  ibmvfc: send Cancel MAD down each hw scsi channel
  ibmvfc: enable MQ and set reasonable defaults
  ibmvfc: provide modules parameters for MQ settings

 drivers/scsi/ibmvscsi/ibmvfc.c | 706 +++++++++++++++++++++++++++++----
 drivers/scsi/ibmvscsi/ibmvfc.h |  41 +-
 2 files changed, 675 insertions(+), 72 deletions(-)


Powered by blists - more mailing lists