NIC is unavailable in DPDK application

[Дмитрий Степанов]

Hey!
Realtek NICs are not supported by DPDK.
You can check the list of supported HW here -
https://core.dpdk.org/supported/
As a workaround you can setup virtual machine (e.g. using KVM) with virtual
NIC which is supported by DPDK (e.g. vmxnet3)

BTW: here is an article where someone tried to write his own PMD for
Realtek NIC -
https://medium.com/powerof2/writing-a-pmd-for-dpdk-56e6388467a8



вт, 29 мар. 2022 г. в 11:21, Danil Onishchenko <
danil.onishchenko.info at gmail.com>:

> Hello,
>
> I'm studying DPDK and trying to create a simple application, however it
> can't see a NIC bound to DPDK.
>
> 1. Here is a list of network devices I have on my machine
>
> $ dpdk-devbind.py --status-dev net
>
> Network devices using kernel driver
> ===================================
> 0000:01:00.0 'RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
> 8168' if=enp1s0 drv=r8169 unused=vfio-pci *Active*
> 0000:02:00.0 'RTL8822BE 802.11a/b/g/n/ac WiFi adapter b822' if=wlp2s0
> drv=rtw_8822be unused=rtw88_8822be,vfio-pci *Active*
>
> 2. I disable my ethernet NIC (it can't be bound to DPDK while it is
> active) and bind it to vfio-pci driver successfully
>
> $ ip link set enp1s0 down
> $ dpdk-devbind.py -b vfio-pci enp1s0
>
> 3. Now dpdk-devbind.py shows that the NIC is using DPDK-compatible driver
>
> $ dpdk-devbind.py --status-dev net
>
> Network devices using DPDK-compatible driver
> ============================================
> 0000:01:00.0 'RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
> 8168' drv=vfio-pci unused=r8169
>
> Network devices using kernel driver
> ===================================
> 0000:02:00.0 'RTL8822BE 802.11a/b/g/n/ac WiFi adapter b822' if=wlp2s0
> drv=rtw_8822be unused=rtw88_8822be,vfio-pci *Active*
>
> 4. However when I run any example DPDK application it says that there
> are no available NIC ports. For instance I wrote a simple application
>
> int main(int argc, char *argv[])
> {
>      int ret;
>      int total_ports, avail_ports;
>
>      ret = rte_eal_init(argc, argv);
>      if( ret < 0 )
>          rte_exit(EXIT_FAILURE, "EAL initialization failed\n");
>
>      total_ports = rte_eth_dev_count_total();
>      avail_ports = rte_eth_dev_count_avail();
>      printf("ETH PORTS %d %d\n", total_ports, avail_ports);
>
>      rte_eal_cleanup();
>
>      return 0;
> }
>
> and both rte_eth_dev_count_total() and rte_eth_dev_count_avail() return 0.
>
> What am I doing wrong?
>
>
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