[CentOS] CentOS7 sometimes don't detect NIC after reboot

On Tue, Sep 17, 2019 at 9:55 AM Miroslav Geisselreiter <mg at intar.cz> wrote:
>
> Dne 17.9.2019 v 15:25 Mauricio Tavares napsal(a):
> > On Tue, Sep 17, 2019 at 9:11 AM Miroslav Geisselreiter <mg at intar.cz> wrote:
> >> Dne 17.9.2019 v 14:02 Mauricio Tavares napsal(a):
> >>> On Tue, Sep 17, 2019 at 7:06 AM Miroslav Geisselreiter <mg at intar.cz> wrote:
> >>>> I have brand new PC with this components:
> >>>> CPU Intel® Pentium G5400, LGA1151
> >>>> motherboard ASUS PRIME B360M-C
> >>>> 16 GB RAM
> >>>> HDD 2x ADATA SSD 256GB XPG GAMMIX S11, PCIe Gen3x4 M.2 2280 (RAID1)
> >>>> NIC Intel X550-T1 Ethernet Converged Network Adapter
> >>>>
> >>>> I installed CentOS 7 and two NICs were detected:
> >>>> eno1 (on motherboard)
> >>>> enp1s0 (Intel X550-T1)
> >>>>
> >>>> When I restart the machine sometimes enp1s0 is missing. It is not
> >>>> detected during boot. It looks like NIC card is not installed / not
> >>>> present. After next reboot everything is fine and I do not see any
> >>>> problems with NIC card.
> >>>>
> >>>> How can I avoid this problem with missing NIC? Can you help me, please?
> >>>>
> >>>         Nothing exciting on dmesg? Did you check the pci chain to see if
> >>> it is being reported as there?
> >>>
> >> I do not know what you mean "check the pci chain". My knowledge of
> >> kernel level is weak, sorry. What else can I do?
> >>
> >        The "checking the pci chain" argument is that sometimes the card
> > is there but is cheerfully ignored. From
> >
> >> [    1.720556] ixgbe 0000:01:00.0: irq 138 for MSI/MSI-X
> > You know that it is in bus 1 slot 0, so try something like
> >
> > lspci -s 01:00.0 -v
> >
> > to see if it reports something there. Just in the odd case the pci
> > side of your computer knows there is a card there but the kernel can't
> > be bothered (flaky driver?). I am probably not using the right
> > terminology, and clearly expect someone to set me right, I've had
> > network cards that would show in the pci chain but not in dmesg. Other
> > thing you want to think about is that I've had cards that only worked
> > if were inserted in a specific slot for no reason whatsoever.
> >
> Thank you Mauricio and Mark for fast response.
> lspci -s 01:00.0 -v
> 01:00.0 Ethernet controller: Intel Corporation Ethernet Controller 10G
> X550T (rev 01)
>          Subsystem: Intel Corporation Ethernet Converged Network Adapter
> X550-T1
>          Flags: bus master, fast devsel, latency 0, IRQ 16
>          Memory at a0000000 (64-bit, prefetchable) [size=2M]
>          Memory at a0200000 (64-bit, prefetchable) [size=16K]
>          Expansion ROM at a2300000 [disabled] [size=512K]
>          Capabilities: [40] Power Management version 3
>          Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
>          Capabilities: [70] MSI-X: Enable+ Count=64 Masked-
>          Capabilities: [a0] Express Endpoint, MSI 00
>          Capabilities: [100] Advanced Error Reporting
>          Capabilities: [140] Device Serial Number 9f-f8-46-ff-ff-28-00-00
>          Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
>          Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
>          Capabilities: [1a0] Transaction Processing Hints
>          Capabilities: [1b0] Access Control Services
>          Capabilities: [1c0] Latency Tolerance Reporting
>          Capabilities: [1d0] #19
>          Kernel driver in use: ixgbe
>          Kernel modules: ixgbe
>
> I will check again after reboot and as Mark recommend I will reseat the
> card. I will check BIOS too. As this is production machine I cannot do
> that now. I am going to buy another cheaper 1 Gb Intel card for testing
> purposes. I will report my results later.
>
      If lspci *always* show card, check the kernel module.

> Miroslav
>