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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
Download Patch File Download Diff File Expand all files Collapse all files
ci-scripts/conf_files/gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf
+1 -1
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@@ -251,7 +251,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("98:ae:71:04:83:e3", "98:ae:71:04:83:e3");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (285, 470);
T1a_cp_ul = (285, 429);
ci-scripts/conf_files/gnb.sa.band78.273prb.fhi72.4x4-benetel550.conf
+1 -1
View File
@@ -258,7 +258,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("70:b3:d5:e1:5b:81", "70:b3:d5:e1:5b:81");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (419, 470);
T1a_cp_ul = (285, 336);
doc/ORAN_FHI7.2_Tutorial.md
+13 -13
View File
@@ -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
radio/fhi_72/oran-config.c
+4 -4
View File
@@ -687,8 +687,8 @@ static bool set_fh_init(void *mplane_api, struct xran_fh_init *fh_init, enum xra
if (!set_fh_eaxcid_conf_mplane(&fh_init->eAxCId_conf, xran_cat, ru_session_list))
return false;
/* maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be
communicated in a single xRAN network layer transaction. Supported 1500 bytes and 9600 bytes (Jumbo Frame);
xran only checks if (MTU <= 1500), therefore setting any value > 1500, xran assumes 9600 value is used */
communicated in a single xRAN network layer transaction. Based on the MTU size, xran calculates the number
of DL fragments (nPrbElm) needed for transmission of one symbol. */
fh_init->mtu = ru_session_list->ru_session[0].xran_mplane.mtu; // we suppose that each RU supports the same MTU size
int num_ru_addr = (fh_init->io_cfg.one_vf_cu_plane) ? num_rus : 2*num_rus;
@@ -711,8 +711,8 @@ static bool set_fh_init(void *mplane_api, struct xran_fh_init *fh_init, enum xra
if (!set_fh_eaxcid_conf(&fh_init->eAxCId_conf, xran_cat))
return false;
/* maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be
communicated in a single xRAN network layer transaction. Supported 1500 bytes and 9600 bytes (Jumbo Frame);
xran only checks if (MTU <= 1500), therefore setting any value > 1500, xran assumes 9600 value is used */
communicated in a single xRAN network layer transaction. Based on the MTU size, xran calculates the number
of DL fragments (nPrbElm) needed for transmission of one symbol. */
fh_init->mtu = *gpd(fhip, nump, ORAN_CONFIG_MTU)->uptr;
int num_ru_addr = gpd(fhip, nump, ORAN_CONFIG_RU_ADDR)->numelt;
fh_init->p_o_ru_addr = calloc(num_ru_addr, sizeof(struct rte_ether_addr));
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-du.sa.band77.273prb.fhi72.4x4-benetel650.conf
+1 -1
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@@ -237,7 +237,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("8c:1f:64:d1:10:46","8c:1f:64:d1:10:46");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (419, 470);
T1a_cp_ul = (285, 336);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-du.sa.band77.273prb.fhi72.4x4-das-benetel650_650.conf
+1 -1
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@@ -241,7 +241,7 @@ 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"); # if two VFs, set two RU MAC addresses (one per RU)
mtu = 9600;
mtu = 9216;
fh_config = (
# RAN650 #1
{
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb-du.sa.band77.273prb.fhi72.8x8-benetel650_650.conf
+1 -1
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@@ -237,7 +237,7 @@ 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"); # if two VFs, set two RU MAC addresses (one per RU)
mtu = 9600;
mtu = 9216;
fh_config = (
# RAN650 #1
{
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.106prb.fhi72.4x4-vvdn.conf
+1 -1
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@@ -256,7 +256,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("98:ae:71:04:83:e3", "98:ae:71:04:83:e3");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (285, 470);
T1a_cp_ul = (285, 429);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.2x2-vvdn.conf → targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.2x2-vvdn-16b.conf
+1 -1
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@@ -253,7 +253,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("98:ae:71:04:83:e3", "98:ae:71:04:83:e3");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (285, 470);
T1a_cp_ul = (285, 429);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band77.273prb.fhi72.4x4-vvdn.conf
+1 -1
View File
@@ -255,7 +255,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("98:ae:71:04:83:e3", "98:ae:71:04:83:e3");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (285, 470);
T1a_cp_ul = (285, 429);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x2-benetel550.conf
+1 -1
View File
@@ -255,7 +255,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("70:b3:d5:e1:5b:81", "70:b3:d5:e1:5b:81");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (419, 470);
T1a_cp_ul = (285, 336);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-benetel550.conf
+1 -1
View File
@@ -257,7 +257,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("70:b3:d5:e1:5b:81", "70:b3:d5:e1:5b:81");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (419, 470);
T1a_cp_ul = (285, 336);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-foxconn.conf
+1 -1
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@@ -254,7 +254,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("6c:ad:ad:00:04:dc", "6c:ad:ad:00:04:dc");
mtu = 9600;
mtu = 9216;
fh_config = ({
T1a_cp_dl = (285, 470);
T1a_cp_ul = (285, 429);
targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.273prb.fhi72.4x4-liteon.conf
+1 -1
View File
@@ -254,7 +254,7 @@ fhi_72 = {
io_core = 1;
worker_cores = (2);
ru_addr = ("e8:c7:4f:25:81:b3", "e8:c7:4f:25:81:b3");
mtu = 9600; # note: 1500 works as well, with both E and F releases
mtu = 9216; # note: 1500 works as well, with both E and F releases
fh_config = ({
T1a_cp_dl = (285, 429);
T1a_cp_ul = (285, 429);