Cedric Roux
c866677a8f
How to use:
1 - compilation of softmodem:
./build_oai --eNB -t ETHERNET
2 - compilation of mobipass driver:
cd cmake_targets/lte_build_oai/build
make oai_mobipass
ln -sf liboai_mobipass.so liboai_transpro.so
3 - configuration:
edit the configuration file, set "node_timing" to
"synch_to_mobipass_standalone"
that is, have the line:
node_timing = "synch_to_mobipass_standalone";
4 - run:
run as usual: sudo ./lte-softmodem -C <configuration file>
190 lines
6.6 KiB
C
190 lines
6.6 KiB
C
#include <arpa/inet.h>
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#include <linux/if_packet.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/ether.h>
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#include <unistd.h>
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#include <errno.h>
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#include <linux/sysctl.h>
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#include <sys/sysctl.h>
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#include "common_lib.h"
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#include "ethernet_lib.h"
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#include "mobipass.h"
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#include "queues.h"
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struct mobipass_header {
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uint16_t flags;
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uint16_t fifo_status;
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unsigned char seqno;
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unsigned char ack;
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uint32_t word0;
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uint32_t timestamp;
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} __attribute__((__packed__));
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int mobipass_start(openair0_device *device) { init_mobipass(device->priv); return 0; }
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int mobipass_request(openair0_device *device, void *msg, ssize_t msg_len) { abort(); return 0; }
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int mobipass_reply(openair0_device *device, void *msg, ssize_t msg_len) { abort(); return 0; }
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int mobipass_get_stats(openair0_device* device) { return 0; }
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int mobipass_reset_stats(openair0_device* device) { return 0; }
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void mobipass_end(openair0_device *device) {}
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int mobipass_stop(openair0_device *device) { return 0; }
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int mobipass_set_freq(openair0_device* device, openair0_config_t *openair0_cfg,int exmimo_dump_config) { return 0; }
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int mobipass_set_gains(openair0_device* device, openair0_config_t *openair0_cfg) { return 0; }
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int mobipass_write(openair0_device *device, openair0_timestamp timestamp, void **buff, int nsamps, int cc, int flags) {
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mobipass_state_t *mobi = device->priv;
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struct mobipass_header *mh = (struct mobipass_header *)(((char *)buff[0]) + 14);
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mobi->mobipass_write_last_timestamp += 640;
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mobi->mobipass_write_last_timestamp %= mobi->samples_per_1024_frames;
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mh->timestamp = htonl(ntohl(mh->timestamp) % mobi->samples_per_1024_frames);
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if (mobi->mobipass_write_last_timestamp != ntohl(mh->timestamp))
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{ printf("mobipass: ERROR: bad timestamp wanted %d got %d\n", mobi->mobipass_write_last_timestamp, ntohl(mh->timestamp)); exit(1); }
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//printf("__write nsamps %d timestamps %ld seqno %d (packet timestamp %d)\n", nsamps, timestamp, mh->seqno, ntohl(mh->timestamp));
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if (nsamps != 640) abort();
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enqueue_to_mobipass(mobi->qstate, buff[0]);
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return nsamps;
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}
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int mobipass_read(openair0_device *device, openair0_timestamp *timestamp, void **buff, int nsamps, int cc) {
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mobipass_state_t *mobi = device->priv;
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//printf("__read nsamps %d return timestamp %d\n", nsamps, ts);
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*timestamp = htonl(mobi->mobipass_read_ts);
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mobi->mobipass_read_ts += nsamps;
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mobi->mobipass_read_ts %= mobi->samples_per_1024_frames;
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if (nsamps != 640) { printf("mobipass: ERROR: bad nsamps %d, should be 640\n", nsamps); fflush(stdout); abort(); }
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dequeue_from_mobipass(mobi->qstate, ntohl(*timestamp), buff[0]);
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#if 1
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struct mobipass_header *mh = (struct mobipass_header *)(((char *)buff[0]) + 14);
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mh->flags = 0;
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mh->fifo_status = 0;
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mh->seqno = mobi->mobipass_read_seqno++;
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mh->ack = 0;
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mh->word0 = 0;
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mh->timestamp = htonl(mobi->mobipass_read_ts);
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#endif
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return nsamps;
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}
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/* this is the only function in the library that is visible from outside
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* because in CMakeLists.txt we use -fvisibility=hidden
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*/
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__attribute__((__visibility__("default")))
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int transport_init(openair0_device *device, openair0_config_t *openair0_cfg,
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eth_params_t * eth_params )
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{
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//init_mobipass();
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mobipass_state_t *mobi = (mobipass_state_t*)malloc(sizeof(mobipass_state_t));
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memset(mobi, 0, sizeof(mobipass_state_t));
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if (eth_params->transp_preference != 4) goto err;
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if (eth_params->if_compress != 0) goto err;
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/* only 50 PRBs handled for the moment */
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if (openair0_cfg[0].sample_rate != 15360000) {
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printf("mobipass: ERROR: only 50 PRBs supported\n");
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exit(1);
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}
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mobi->eth.flags = ETH_RAW_IF5_MOBIPASS;
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mobi->eth.compression = NO_COMPRESS;
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device->Mod_id = 0;//num_devices_eth++;
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device->transp_type = ETHERNET_TP;
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device->trx_start_func = mobipass_start;
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device->trx_request_func = mobipass_request;
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device->trx_reply_func = mobipass_reply;
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device->trx_get_stats_func = mobipass_get_stats;
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device->trx_reset_stats_func = mobipass_reset_stats;
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device->trx_end_func = mobipass_end;
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device->trx_stop_func = mobipass_stop;
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device->trx_set_freq_func = mobipass_set_freq;
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device->trx_set_gains_func = mobipass_set_gains;
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device->trx_write_func = mobipass_write;
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device->trx_read_func = mobipass_read;
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device->priv = mobi;
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mobi->eth.if_name = strdup(eth_params->local_if_name);
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if (mobi->eth.if_name == NULL) abort();
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if (sscanf(eth_params->my_addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
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&mobi->eth_local[0],
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&mobi->eth_local[1],
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&mobi->eth_local[2],
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&mobi->eth_local[3],
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&mobi->eth_local[4],
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&mobi->eth_local[5]) != 6) {
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printf("mobipass: ERROR: bad local ethernet address '%s', check configuration file\n",
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eth_params->my_addr);
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exit(1);
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}
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if (sscanf(eth_params->remote_addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
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&mobi->eth_remote[0],
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&mobi->eth_remote[1],
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&mobi->eth_remote[2],
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&mobi->eth_remote[3],
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&mobi->eth_remote[4],
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&mobi->eth_remote[5]) != 6) {
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printf("mobipass: ERROR: bad remote ethernet address '%s', check configuration file\n",
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eth_params->remote_addr);
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exit(1);
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}
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/* note: this only works for 50 PRBs */
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mobi->samples_per_1024_frames = 7680*2*10*1024;
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/* TX starts at subframe 4, let's pretend we are at the right position */
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/* note: this only works for 50 PRBs */
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mobi->mobipass_write_last_timestamp = 4*7680*2-640;
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/* device specific */
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openair0_cfg[0].iq_rxrescale = 15;//rescale iqs
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openair0_cfg[0].iq_txshift = eth_params->iq_txshift;// shift
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openair0_cfg[0].tx_sample_advance = eth_params->tx_sample_advance;
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/* this is useless, I think */
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if (device->host_type == BBU_HOST) {
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/*Note scheduling advance values valid only for case 7680000 */
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switch ((int)openair0_cfg[0].sample_rate) {
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case 30720000:
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openair0_cfg[0].samples_per_packet = 3840;
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break;
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case 23040000:
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openair0_cfg[0].samples_per_packet = 2880;
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break;
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case 15360000:
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openair0_cfg[0].samples_per_packet = 1920;
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break;
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case 7680000:
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openair0_cfg[0].samples_per_packet = 960;
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break;
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case 1920000:
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openair0_cfg[0].samples_per_packet = 240;
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break;
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default:
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printf("mobipass: ERROR: unknown sampling rate %f\n",openair0_cfg[0].sample_rate);
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exit(-1);
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break;
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}
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}
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device->openair0_cfg=&openair0_cfg[0];
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return 0;
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err:
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printf("mobipass: ERROR: bad configuration file?\n");
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exit(1);
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}
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