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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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radio/fhi_72/oran-config.c
+4 -4
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@@ -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));