Configuring RU Emulator with srsRAN gNB

[cueltschey]

I'm trying to set up an RU emulator that will run with a gNB in test mode. I have both the RU emulator and srsRAN running at the same time but they can't transmit packets to one another, due most likely to a misconfiguration of one or both.

Here are the commands I am running:
to start the RU -> sudo ./ru_emulator -c ~/ru_em.yaml
to start the gNB -> sudo ./gnb -c ~/gnb.yml amf --no_core true test_mode test_ue --rnti 0x1 --ri 2

I have an SFP+ ethernet NIC card that I have bound. I am using 0000:17:00.0 for the gNB and 0000:17:00.1 for the RU.

When I run them both there are no packets exchanged

~/gnb.yml

ru_ofh: 
  gps_alpha: 0 
  gps_beta: 0 
  ru_bandwidth_MHz: 20  
  t1a_max_cp_dl: 500   
  t1a_min_cp_dl: 258  
  t1a_max_cp_ul: 500 
  t1a_min_cp_ul: 258
  t1a_max_up: 300  
  t1a_min_up: 85  
  ta4_max: 300   
  ta4_min: 85   
  is_prach_cp_enabled: true   
  is_dl_broadcast_enabled: false
  ignore_ecpri_seq_id: false  
  ignore_ecpri_payload_size: false
  warn_unreceived_ru_frames: true
  compr_method_ul: bfp        
  compr_bitwidth_ul: 9       
  compr_method_dl: bfp      
  compr_bitwidth_dl: 9     
  compr_method_prach: bfp 
  compr_bitwidth_prach: 9
  enable_ul_static_compr_hdr: true   
  enable_dl_static_compr_hdr: true  
  iq_scaling: 0.35                 
  cells:
    - network_interface: 0000:17:00.0
      ru_mac_addr: 80:61:5f:0d:df:ab
      du_mac_addr: 64:b3:79:10:00:37
      vlan_tag_cp: 2               
      vlan_tag_up: 2              
      prach_port_id: [4,5]       
      dl_port_id: [0,1]         
      ul_port_id: [0,1]          

cell_cfg:
  dl_arfcn: 637212                                               
  band: 78                                                       
  channel_bandwidth_MHz: 20                                     
  common_scs: 30                                                 
  plmn: "00101"                                                  
  tac: 7                                                         
  pci: 1                                                         
  nof_antennas_dl: 2                                             
  nof_antennas_ul: 2                                             
  prach:
    prach_config_index: 7                                        
    prach_root_sequence_index: 1                                 
    zero_correlation_zone: 0                                     
    prach_frequency_start: 0                                     
  tdd_ul_dl_cfg:
    dl_ul_tx_period: 10                                          
    nof_dl_slots: 7                                              
    nof_dl_symbols: 6                                            
    nof_ul_slots: 2                                              
    nof_ul_symbols: 4

hal:
  eal_args: "--lcores (0-1)@(0-15) -a 0000:17:00.0"

~/ru_em.yaml

log:
  filename: /tmp/ru_em.log
  level: warning

dpdk:
  eal_args: "--lcores (0-1)@(0-15) -a 0000:17:00.1 --file-prefix ru"

ru_emu:
  cells:
  - bandwidth: 100
    network_interface: 0000:17:00.1
    ru_mac_addr: 80:61:5f:09:b6:c7
    du_mac_addr: 80:61:5f:09:b6:c6
    vlan_tag: 2
    ul_port_id: [0]
    compr_method_ul: "bfp"
    compr_bitwidth_ul: 9

/tmp/gnb.log

2024-07-09T19:48:59.386528 [OFH     ] [W] Missed incoming User-Plane PRACH messages for slot '505.18' and sector#0
2024-07-09T19:48:59.396527 [OFH     ] [W] Missed incoming User-Plane PRACH messages for slot '506.18' and sector#0
2024-07-09T19:48:59.401539 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '0' and sector#0
2024-07-09T19:48:59.401540 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '1' and sector#0
2024-07-09T19:48:59.401540 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '2' and sector#0
2024-07-09T19:48:59.401541 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '3' and sector#0
2024-07-09T19:48:59.401541 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '4' and sector#0
2024-07-09T19:48:59.401541 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '5' and sector#0
2024-07-09T19:48:59.401542 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '6' and sector#0
2024-07-09T19:48:59.401542 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '7' and sector#0
2024-07-09T19:48:59.401542 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '8' and sector#0
2024-07-09T19:48:59.401543 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '9' and sector#0
2024-07-09T19:48:59.401544 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '10' and sector#0
2024-07-09T19:48:59.401544 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '11' and sector#0
2024-07-09T19:48:59.401544 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '12' and sector#0
2024-07-09T19:48:59.401545 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.8', symbol '13' and sector#0
2024-07-09T19:48:59.402023 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '0' and sector#0
2024-07-09T19:48:59.402024 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '1' and sector#0
2024-07-09T19:48:59.402024 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '2' and sector#0
2024-07-09T19:48:59.402024 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '3' and sector#0
2024-07-09T19:48:59.402025 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '4' and sector#0
2024-07-09T19:48:59.402025 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '5' and sector#0
2024-07-09T19:48:59.402025 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '6' and sector#0
2024-07-09T19:48:59.402025 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '7' and sector#0
2024-07-09T19:48:59.402026 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '8' and sector#0
2024-07-09T19:48:59.402026 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '9' and sector#0
2024-07-09T19:48:59.402027 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '10' and sector#0
2024-07-09T19:48:59.402027 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '11' and sector#0
2024-07-09T19:48:59.402027 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '12' and sector#0
2024-07-09T19:48:59.402028 [OFH     ] [W] Missed incoming User-Plane uplink messages for slot '506.9', symbol '13' and sector#0

Any help on how I could configure them would be helpful. I am not quite sure how to set the VLANs, MAC addresses etc.

Thanks, chase

[herlesupreeth]

Rather than using network_interface: 0000:17:00.1 and network_interface: 0000:17:00.0 I would use the lo interface

in ru_emu.yml

    network_interface: lo
    ru_mac_addr: 00:00:00:00:00:00
    du_mac_addr: 00:00:00:00:00:00

and in gnb.yml

  - network_interface: lo
    ru_mac_addr: 00:00:00:00:00:00
    du_mac_addr: 00:00:00:00:00:00

[Higgigamer19]

This was solved by using a dual port NIC, assigning the gnb to one port (ie 0000:17:00.0) and the ru_emulator to the other (ie 0000:17:00.1).