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Correct the MTU for 7.2 config files

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Even though the jumbo frame has 9600 bytes by the spec, the max MTU is limited to the MTU of a switch, if any used.
However, the value can be < max MTU of a switch.

This is very important for fragmentation purposes. If not properly set, the PDSCH packets will be missing.
This commit is contained in:
Teodora
2026-01-29 10:59:15 +01:00
parent f65b8f564f
commit 88c74dc07f
14 changed files with 29 additions and 29 deletions
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doc/ORAN_FHI7.2_Tutorial.md
+13 -13
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@@ -526,7 +526,7 @@ Contact the RU vendor and get the configuration manual to understand the below c
The OAI configuration file [`gnb-du.sa.band77.273prb.fhi72.4x4-benetel650.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-du.sa.band77.273prb.fhi72.4x4-benetel650.conf) corresponds to:
- TDD pattern `DDDSU`, 2.5ms
- Bandwidth 100MHz
- MTU 9600
- MTU 9216
- 4TX4R
##### RU configuration
@@ -552,7 +552,7 @@ dl_ul_tuning_special_slot=0xfd00000
The OAI configuration file [`gnb.sa.band78.273prb.fhi72.4x4-benetel550.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-benetel550.conf) corresponds to:
- TDD pattern `DDDDDDDSUU`, 5ms
- Bandwidth 100MHz
- MTU 9600
- MTU 9216
- 4TX4R
##### RU configuration
@@ -579,7 +579,7 @@ The OAI configuration file [`gnb.sa.band78.273prb.fhi72.4x4-liteon.conf`](../tar
- TDD pattern `DDDSU`, 2.5ms
- Bandwidth 100MHz
- MTU 1500
- MTU 9600: v02.00.10
- MTU 9216: v02.00.10
##### RU configuration
@@ -618,7 +618,7 @@ jumboframe 1 # enable jumbo frame
The OAI configuration file [`gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf) corresponds to:
- TDD pattern `DDDSU`, 2.5ms
- Bandwidth 100MHz
- MTU 9600
- MTU 9216
##### RU configuration
@@ -692,7 +692,7 @@ At this stage, RU must be rebooted so the changes apply.
The OAI configuration file [`gnb.sa.band78.273prb.fhi72.4X4-foxconn.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4X4-foxconn.conf) corresponds to:
- TDD pattern `DDDSU`, 2.5ms
- Bandwidth 100MHz
- MTU 9600
- MTU 9216
##### RU configuration
@@ -895,7 +895,7 @@ We recommand to put the above four steps into one script file to quickly repeat
set -x
IF_NAME=eno12409
MAX_RING_BUFFER_SIZE=4096
MTU=9600
MTU=9216
DU_U_PLANE_MAC_ADD=00:11:22:33:44:66
DU_C_PLANE_MAC_ADD=00:11:22:33:44:67
VLAN=3
@@ -931,7 +931,7 @@ Sample configuration files for OAI gNB, specific to the manufacturer of the radi
2. VVDN RU:
[`gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf)
[`gnb.sa.band77.106prb.fhi72.4x4-vvdn.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.106prb.fhi72.4x4-vvdn.conf)
[`gnb.sa.band77.273prb.fhi72.2x2-vvdn.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.2x2-vvdn.conf)
[`gnb.sa.band77.273prb.fhi72.2x2-vvdn-16b.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.2x2-vvdn-16b.conf)
3. Benetel 650 RU:
[`gnb-du.sa.band77.273prb.fhi72.4x4-benetel650.conf`](../targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-du.sa.band77.273prb.fhi72.4x4-benetel650.conf)
4. Benetel 550 RU:
@@ -970,7 +970,7 @@ Edit the sample OAI gNB configuration file and check following parameters:
* `io_core`: absolute CPU core ID for XRAN library, it should be an isolated core, in our environment we are using CPU 4
* `worker_cores`: array of absolute CPU core IDs for XRAN library, they should be isolated cores, in our environment we are using CPU 2
* `ru_addr`: RU U- and C-plane MAC-addresses (format `UU:VV:WW:XX:YY:ZZ`, hexadecimal numbers)
* `mtu`: Maximum Transmission Unit for the RU, specified by RU vendor; either 1500 or 9600 B (Jumbo Frames); if not set, 1500 is used
* `mtu`: Maximum Transmission Unit for the RU, specified by RU vendor; either 1500 or 9600 B (Jumbo Frames); if not set, 1500 is used; if the testbed contains a switch, and its max supported MTU < 9600, then please set the same value in the config file as well
* `file_prefix` : used to specify a unique prefix for shared memory and files created by multiple DPDK processes; if not set, default value of `wls_0` is used
* `dpdk_mem_size`: the huge page size that should be pre-allocated by DPDK
_for NUMA node 0_; by default, this is 8192 MiB (corresponding to 8 huge
@@ -1171,7 +1171,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("8c:1f:64:d1:10:46","8c:1f:64:d1:10:46","8c:1f:64:d1:10:43","8c:1f:64:d1:10:43")
mtu = 9600;
mtu = 9216;
fh_config = (
# RAN650 #1
{
@@ -1587,11 +1587,11 @@ sequenceDiagram
[HW] [MPLANE] Watchdog timer answer:
<next-update-at xmlns="urn:o-ran:supervision:1.0">2025-03-30T08:52:31+02:00</next-update-at>
[HW] [MPLANE] Interface MTU 1500 unreliable/not correctly reported by Benetel O-RU, hardcoding to 9600.
[HW] [MPLANE] Interface MTU 1500 unreliable/not correctly reported by Benetel O-RU, hardcoding to 9216.
[HW] [MPLANE] IQ bitwidth 16 unreliable/not correctly reported by Benetel O-RU, hardcoding to 9.
[HW] [MPLANE] Storing the following information to forward to xran:
RU MAC address 8c:1f:64:d1:11:c0
MTU 9600
MTU 9216
IQ bitwidth 9
PRACH offset 4
DU port bitmask 61440
@@ -2238,11 +2238,11 @@ sequenceDiagram
[HW] [MPLANE] Watchdog timer answer:
<next-update-at xmlns="urn:o-ran:supervision:1.0">2025-08-29T06:49:32+02:00</next-update-at>
[HW] [MPLANE] Interface MTU 1500 unreliable/not correctly reported by Benetel O-RU, hardcoding to 9600.
[HW] [MPLANE] Interface MTU 1500 unreliable/not correctly reported by Benetel O-RU, hardcoding to 9216.
[HW] [MPLANE] IQ bitwidth 16 unreliable/not correctly reported by Benetel O-RU, hardcoding to 9.
[HW] [MPLANE] Storing the following information to forward to xran:
RU MAC address 70:b3:d5:e1:5b:81
MTU 9600
MTU 9216
IQ bitwidth 9
PRACH offset 4
DU port bitmask 61440