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SDAP: Use GTP direct API instead of ITTI

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Using ITTI calls for user plane implies (1) a memory allocation, (2)
mutexes, and (3) queueing messages for each user plane packet, which is
heavy. Use a direct API call instead to reduce overhead.
This commit is contained in:
Robert Schmidt
2024-12-11 10:31:52 +01:00
parent 70fa713712
commit 3c5e999f6d
1 changed files with 6 additions and 16 deletions
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openair2/SDAP/nr_sdap/nr_sdap_entity.c
+6 -16
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@@ -240,24 +240,14 @@ static void nr_sdap_rx_entity(nr_sdap_entity_t *entity,
}
}
uint8_t *gtp_buf = (uint8_t *)(buf + offset);
size_t gtp_len = size - offset;
// Pushing SDAP SDU to GTP-U Layer
MessageDef *message_p = itti_alloc_new_message_sized(TASK_PDCP_ENB,
0,
GTPV1U_TUNNEL_DATA_REQ,
sizeof(gtpv1u_tunnel_data_req_t)
+ size + GTPU_HEADER_OVERHEAD_MAX - offset);
AssertFatal(message_p != NULL, "OUT OF MEMORY");
gtpv1u_tunnel_data_req_t *req = &GTPV1U_TUNNEL_DATA_REQ(message_p);
uint8_t *gtpu_buffer_p = (uint8_t *) (req + 1);
memcpy(gtpu_buffer_p + GTPU_HEADER_OVERHEAD_MAX, buf + offset, size - offset);
req->buffer = gtpu_buffer_p;
req->length = size - offset;
req->offset = GTPU_HEADER_OVERHEAD_MAX;
req->ue_id = ue_id;
req->bearer_id = pdusession_id;
LOG_D(SDAP, "%s() sending message to gtp size %d\n", __func__, size-offset);
LOG_D(SDAP, "sending message to gtp size %ld\n", gtp_len);
// very very dirty hack gloabl var N3GTPUInst
itti_send_msg_to_task(TASK_GTPV1_U, *N3GTPUInst, message_p);
instance_t inst = *N3GTPUInst;
gtpv1uSendDirect(inst, ue_id, pdusession_id, gtp_buf, gtp_len, false, false);
} else { //nrUE
/*
* TS 37.324 5.2 Data transfer