From what I can tell, dpdk calles the function  vfio_disable_msix  in the
stop and start function. The reason it does not happen in start up is that
I don't call stop before.
Calling stop and then start calls the function twice. Which maybe shouldn't
happen... Is it a bug?

On Thu, Apr 20, 2023 at 12:33 PM Igor de Paula <igordptx@gmail.com> wrote:

> Hi,
> I am having trouble with restarting a HW port allocated to DPDK.
> I am running the DPDK version: 21.08.0 and Ubuntu 20.04.3 LTS.
> The driver is : net_e100igb
> After I start the port with no issues I try to call rte_eth_dev_stop to
> stop it.
> When I am ready I call rte_eth_dev_start to start it again an I get the
> following message:
> EAL: Error disabling MSI-X interrupts for fd 46.
> I am not sure what this error is coming from and what it causes.
> I found little information online. If someone could explain, I would
> really appreciate it.
> This is a copy print on setup with no issues:
> 2023-04-20 11:09:51.703542:     Driver: net_e1000_igb
> 2023-04-20 11:09:51.703546:     Bus Id: 0000:01:00.0
> 2023-04-20 11:09:51.703551:     rx offload cap: 280e (92e0f)
> 2023-04-20 11:09:51.703555:     tx offload cap: 8002 (803f)
> 2023-04-20 11:09:51.703559:     NUMA Socket: 0
> 2023-04-20 11:09:51.703563:     MAC Address: b4:96:91:63:62:40
> 2023-04-20 11:09:51.703568:     Max Rx Queue: 8
> 2023-04-20 11:09:51.703572:     Max Tx Queue: 8
> 2023-04-20 11:09:51.703577:     Max Rx Descriptors: 4096
> 2023-04-20 11:09:51.703581:     Max Tx Descriptors: 4096
> 2023-04-20 11:09:51.703585:     Max Rx Packet Length: 16383
> 2023-04-20 11:09:51.703589:     Available Link Speeds: 10Mb/s 100Mb/s 1Gb/s
> 2023-04-20 11:09:51.703608:     Fixed Link Speed: Auto
> 2023-04-20 11:09:51.703616:     Fixed Duplex: Auto
> 2023-04-20 11:09:51.703623:     MTU Set to: 16383
> 2023-04-20 11:09:51.703632:     Actual Rx Descriptors: 4096
> 2023-04-20 11:09:51.703636:     Actual Tx Descriptors: 4096
> 2023-04-20 11:09:51.703695:     Set up 1 send queues
> 2023-04-20 11:09:51.703700:     Actual MTU: 16383
> 2023-04-20 11:09:51.703704:     Actual Linkspeed: 0
> 2023-04-20 11:09:51.703708:     Actual duplex: 0
> 2023-04-20 11:09:51.703713:     Successfully set port interrupt event
> 2023-04-20 11:09:51.818085:     Flow control turned off for Port 0
> 2023-04-20 11:09:51.844179:     Port 0 up and running
> 2023-04-20 11:09:51.844303: Event type: LSC interrupt
> 2023-04-20 11:09:51.844382:     Port 0 Link Down
>
> And after I stop and start:
> 2023-04-20 11:11:00.492428:     Driver: net_e1000_igb
> 2023-04-20 11:11:00.492476:     Bus Id: 0000:01:00.0
> 2023-04-20 11:11:00.492526:     rx offload cap: 280e (92e0f)
> 2023-04-20 11:11:00.492576:     tx offload cap: 8002 (803f)
> 2023-04-20 11:11:00.492624:     NUMA Socket: 0
> 2023-04-20 11:11:00.492672:     MAC Address: b4:96:91:63:62:40
> 2023-04-20 11:11:00.492721:     Max Rx Queue: 8
> 2023-04-20 11:11:00.492770:     Max Tx Queue: 8
> 2023-04-20 11:11:00.492813:     Max Rx Descriptors: 4096
> 2023-04-20 11:11:00.492851:     Max Tx Descriptors: 4096
> 2023-04-20 11:11:00.492889:     Max Rx Packet Length: 16383
> 2023-04-20 11:11:00.492958:     Available Link Speeds: 10Mb/s 100Mb/s 1Gb/s
> 2023-04-20 11:11:00.493207:     Fixed Link Speed: Auto
> 2023-04-20 11:11:00.493301:     Fixed Duplex: Full
> 2023-04-20 11:11:00.493822:     MTU Set to: 16383
> 2023-04-20 11:11:00.493889:     Actual Rx Descriptors: 4096
> 2023-04-20 11:11:00.493936:     Actual Tx Descriptors: 4096
> 2023-04-20 11:11:00.494190:     Actual MTU: 16383
> 2023-04-20 11:11:00.494229:     Actual Linkspeed: 0
> 2023-04-20 11:11:00.494266:     Actual duplex: 1
> 2023-04-20 11:11:00.494305:     Successfully set port interrupt event
> *EAL: Error disabling MSI-X interrupts for fd 46*
> 2023-04-20 11:11:00.603181:     Flow control turned off for Port 0
> 2023-04-20 11:11:00.629151:     Port 0 up and running
> 2023-04-20 11:11:00.629222: Event type: LSC interrupt
> 2023-04-20 11:11:00.629273:     Port 0 Link Down
>
>
> Thanks,
> Igor
>
>
>