Does the mlx5 NIC support reloading

[Matan Azrad]

You can see the failsafe driver.
https://git.dpdk.org/dpdk/tree/drivers/net/failsafe?h=v19.11

Generally, it gets 2 devices.
Once the primary device gets the RMV event it closes it and switch the control to a secondary device.
Meanwhile the drive periodically checks if the primary device is back in the bus and if so, it probe the device again and reconfigure it to be able to switch the control back to the primary device.

Thanks,
Matan


From: jinag <15720603159 at 163.com>
Sent: Monday, 14 August 2023 13:06
To: Matan Azrad <matan at nvidia.com>
Cc: users at dpdk.org; Shahaf Shuler <shahafs at nvidia.com>; Slava Ovsiienko <viacheslavo at nvidia.com>
Subject: Re:RE: Does the mlx5 NIC support reloading

External email: Use caution opening links or attachments

Hi Matan:
Could you please provide me a example?
Thanks a lot


At 2023-08-14 14:41:22, "Matan Azrad" <matan at nvidia.com<mailto:matan at nvidia.com>> wrote:
Hi Jinag

After plugging out the device from the bus, you need to get the event RTE_ETH_EVENT_INTR_RMV.
You need to listen to this event and close the port when you see it.

After plugging in the device, you need to scan the bus again and attach the mlx5 device, so it will be probed again and a new ethdev port will be created.

Then, you need to reconfigure the port, as regular, and reuse the device.

Thanks,
Matan

From: jinag <15720603159 at 163.com<mailto:15720603159 at 163.com>>
Sent: Monday, 14 August 2023 6:07
To: users at dpdk.org<mailto:users at dpdk.org>; Matan Azrad <matan at nvidia.com<mailto:matan at nvidia.com>>; Shahaf Shuler <shahafs at nvidia.com<mailto:shahafs at nvidia.com>>; Slava Ovsiienko <viacheslavo at nvidia.com<mailto:viacheslavo at nvidia.com>>
Subject: Does the mlx5 NIC support reloading

External email: Use caution opening links or attachments

Hi
I am verifying the reload function of the mlx5 nic based on dpdk 19.11:
echo 1 > /sys/bus/pci/devices/$pci_address/remove
echo 1 > /sys/bus/pci/rescan
rte_bus_probe();
rte_eth_dev_stop();
rte_eth_dev_start();
    net_mlx5: port 0 TX queue 0 CQ creation failure
    net_mlx5: port 0 TX queue allocation failed: cannot allocate memory
The nic cannot be reinitialized.

I am not sure if the above operation is correct. Could you please tell me if the mlx5 nic supports reloading(for example, the network card is down during normal  operation) and which dpdk functions need to be called.

Thanks!



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