RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1455017 - LnkCap speed='(null)' in the nodedev-dumpxml of wireless NIC
Summary: LnkCap speed='(null)' in the nodedev-dumpxml of wireless NIC
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.4
Hardware: All
OS: Linux
unspecified
urgent
Target Milestone: rc
: 7.4
Assignee: Laine Stump
QA Contact: Jingjing Shao
URL:
Whiteboard:
Depends On:
Blocks: 1442831
TreeView+ depends on / blocked
 
Reported: 2017-05-24 03:44 UTC by Jingjing Shao
Modified: 2017-08-02 01:34 UTC (History)
8 users (show)

Fixed In Version: libvirt-3.2.0-7.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-02 01:34:35 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1442831 1 None None None 2021-01-20 06:05:38 UTC
Red Hat Product Errata RHEA-2017:1846 0 normal SHIPPED_LIVE libvirt bug fix and enhancement update 2017-08-01 18:02:50 UTC

Internal Links: 1442831

Description Jingjing Shao 2017-05-24 03:44:36 UTC 
Description of problem:
LnkCap speed='(null)'  in the nodedev-dumpxml of wireless NIC 

Version-Release number of selected component (if applicable):
libvirt-3.2.0-5.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. # virsh nodedev-list --tree
computer
  +- pci_0000_00_1c_1
  |   |
  |   +- pci_0000_04_00_0
  |       |
  |       +- net_wlp4s0_5a_86_10_8c_c7_2c

2.# lspci 

04:00.0 Network controller: Intel Corporation Wireless 7265 (rev 99)
......

Capabilities: [40] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 unlimited
                        ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr+ NoSnoop+ FLReset-
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L1, Exit Latency L0s <4us, L1 <32us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range B, TimeoutDis+, LTR+, OBFF Via WAKE#
                DevCtl2: Completion Timeout: 16ms to 55ms, TimeoutDis-, LTR+, OBFF Disabled
                LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
                         EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
.....

3.# virsh nodedev-dumpxml pci_0000_04_00_0                                                                                        
 <device>
  <name>pci_0000_04_00_0</name>
   <path>/sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0</path>
    <parent>pci_0000_00_1c_1</parent>
    <driver>
    <name>iwlwifi</name>
    </driver>
    <capability type='pci'>
     <domain>0</domain>
     <bus>4</bus>
     <slot>0</slot>
     <function>0</function>
     <product id='0x095b'>Wireless 7265</product>
     <vendor id='0x8086'>Intel Corporation</vendor>
     <pci-express>
     <link validity='cap' port='0' speed='(null)' width='1'/>  
     <link validity='sta' speed='2.5' width='1'/>
     </pci-express>
  </capability>
</device>

4.  # virsh nodedev-detach pci_0000_04_00_0
error: Failed to detach device pci_0000_04_00_0
error: malformed 'speed' attribute: (null)


Actual results:
speed='(null)' and make the detachment failed

Expected results:
speed='2.5' and device can be detached successfully

Additional info:
Try on the 7.3 version libvirt-2.0.0-10, it is all right . the speed='2.5' and device can be detached successfully
Comment 3 Laine Stump 2017-05-24 16:52:00 UTC 
I expected something like this would happen when I saw the patch below pushed upstream:

commit 1128769f9ee50bb250333a5a5d276afbe74711ea
Author: Marek Marczykowski-Górecki <marmarek>
Date:   Tue May 16 15:19:19 2017 +0200

    pci: fix link maximum speed detection
    
    Commit 8e09663 "pci: recognize/report GEN4 (PCIe 4.0) card 16GT/s Link
    speed" introduced another speed into enum, but mistakenly also altered
    field width, so one bit of link width was included there.
    

So it's fixed upstream already. I'll backport that to the RHEL build momentarily.
Comment 6 Jingjing Shao 2017-06-01 06:11:03 UTC 
Verify this bug as below.

# rpm -q libvirt
libvirt-3.2.0-7.el7.x86_64

1. # virsh nodedev-list --tree
computer
  +- pci_0000_00_1c_1
  |   |
  |   +- pci_0000_04_00_0
  |       |
  |       +- net_wlp4s0_5a_86_10_8c_c7_2c

2. # virsh nodedev-dumpxml pci_0000_04_00_0
<device>
  <name>pci_0000_04_00_0</name>
  <path>/sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0</path>
  <parent>pci_0000_00_1c_1</parent>
  <driver>
    <name>iwlwifi</name>
  </driver>
  <capability type='pci'>
    <domain>0</domain>
    <bus>4</bus>
    <slot>0</slot>
    <function>0</function>
    <product id='0x095b'>Wireless 7265</product>
    <vendor id='0x8086'>Intel Corporation</vendor>
    <iommuGroup number='11'>
      <address domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </iommuGroup>
    <pci-express>
      <link validity='cap' port='0' speed='2.5' width='1'/>
      <link validity='sta' speed='2.5' width='1'/>
    </pci-express>
  </capability>
</device>

3. # virsh nodedev-detach pci_0000_04_00_0
 Device pci_0000_04_00_0 detached

4. # virsh nodedev-reattach pci_0000_04_00_0
Device pci_0000_04_00_0 re-attached
Comment 7 errata-xmlrpc 2017-08-02 01:34:35 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1846
Note You need to log in before you can comment on or make changes to this bug.