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Feature #11690

closed

Add an option to rescan PCI buses to allow NIC hotplug

Added by Louis Sautier about 3 years ago. Updated about 3 years ago.

Status:
Rejected
Priority:
Normal
Assignee:
-
Category:
Operating System
Target version:
-
Start date:
03/17/2021
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
Release Notes:
Default

Description

Hi,
Would it be possible to add an option to rescan PCI buses? Maybe just a playback command would be enough.

I am surprised that there are no open issues that mention this. The only thing I was able to find is a forum post from 2012 in which jimp explained that it was not possible at the time.

I was able to hotplug an EM1000 NIC from ESXi after finding out which PCI bus the existing NICs were using with devinfo:

        pcib2
          pci2
            em0
            em1

It looks like pciconf -l em0 can also help us identify the bus number of the current NICs:

em0@pci0:2:0:0:    class=0x020000 card=0x075015ad chip=0x100f8086 rev=0x01 hdr=0x00@

I then ran devctl rescan pci2 which made the new interface appear as shown by dmesg's output:

em2: <Intel(R) PRO/1000 Legacy Network Connection 1.1.0> at device 3.0 on pci2
em2: Ethernet address: xx:xx:xx:xx:xx:xx
em2: netmap queues/slots: TX 1/256, RX 1/256
em2: link state changed to UP

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