diff options
author | Harald Welte <laforge@gnumonks.org> | 2011-06-27 11:25:35 +0200 |
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committer | Harald Welte <laforge@gnumonks.org> | 2011-06-27 11:25:35 +0200 |
commit | c6b4c87e5d57b91b29894835e7ac8e42f6e67f32 (patch) | |
tree | 2dfca5a61c881e88e6f29d03c29bb26e1c643332 /src/osmo-bts-sysmo/l1_fwd_main.c | |
parent | 8e47fb89bfd0e2b54b714393ac2a80ca76df56a9 (diff) |
re-work original osmo-bts with support for sysmocom femtobts
This code re-works osmo-bts to add support for the upcoming sysmocom BTS.
It also tries to add some level of abstraction between the generic
part of a BTS (A-bis, RSL, OML, data structures, paging scheduling,
BCCH/AGCH scheduling, etc.) and the actual hardware-specific bits.
The hardware-specific bits are currently only implemented for the sysmocom
femtobts, but should be (re-)added for osmocom-bb, as well as a virtual
BTS for simulation purpose later.
The sysmocom bts specific parts require hardware-specific header files
which are (at least currently) not publicly distributed.
Diffstat (limited to 'src/osmo-bts-sysmo/l1_fwd_main.c')
-rw-r--r-- | src/osmo-bts-sysmo/l1_fwd_main.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/osmo-bts-sysmo/l1_fwd_main.c b/src/osmo-bts-sysmo/l1_fwd_main.c new file mode 100644 index 00000000..c7bdcdf5 --- /dev/null +++ b/src/osmo-bts-sysmo/l1_fwd_main.c @@ -0,0 +1,205 @@ +/* Sysmocom femtobts L1 proxy */ + +/* (C) 2011 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + */ + +#include <stdint.h> +#include <unistd.h> +#include <errno.h> +#include <fcntl.h> + +#include <sys/types.h> +#include <sys/socket.h> +#include <sys/stat.h> + +#include <arpa/inet.h> +#include <netinet/in.h> + +#include <osmocom/core/talloc.h> +#include <osmocom/core/utils.h> +#include <osmocom/core/select.h> +#include <osmocom/core/write_queue.h> +#include <osmocom/core/logging.h> +#include <osmocom/core/socket.h> +#include <osmocom/gsm/gsm_utils.h> + +#include <osmo-bts/logging.h> +#include <osmo-bts/gsm_data.h> + +#include <sysmocom/femtobts/femtobts.h> +#include <sysmocom/femtobts/gsml1prim.h> +#include <sysmocom/femtobts/gsml1const.h> +#include <sysmocom/femtobts/gsml1types.h> + +#include "femtobts.h" +#include "l1_if.h" +#include "l1_fwd.h" + +static const uint16_t fwd_udp_ports[_NUM_MQ_WRITE] = { + [MQ_SYS_READ] = L1FWD_SYS_PORT, + [MQ_L1_READ] = L1FWD_L1_PORT, +}; + +struct l1fwd_hdl { + struct sockaddr_storage remote_sa; + socklen_t remote_sa_len; + + struct osmo_wqueue udp_wq[_NUM_MQ_WRITE]; + + struct femtol1_hdl *fl1h; +}; + + +/* callback when there's a new L1 primitive coming in from the HW */ +int l1if_handle_l1prim(struct femtol1_hdl *fl1h, struct msgb *msg) +{ + struct l1fwd_hdl *l1fh = fl1h->priv; + + /* Enqueue message to UDP socket */ + return osmo_wqueue_enqueue(&l1fh->udp_wq[MQ_L1_WRITE], msg); +} + +/* callback when there's a new SYS primitive coming in from the HW */ +int l1if_handle_sysprim(struct femtol1_hdl *fl1h, struct msgb *msg) +{ + struct l1fwd_hdl *l1fh = fl1h->priv; + + /* Enqueue message to UDP socket */ + return osmo_wqueue_enqueue(&l1fh->udp_wq[MQ_SYS_WRITE], msg); +} + + +/* data has arrived on the udp socket */ +static int udp_read_cb(struct osmo_fd *ofd) +{ + struct msgb *msg = msgb_alloc_headroom(2048, 128, "udp_rx"); + struct l1fwd_hdl *l1fh = ofd->data; + struct femtol1_hdl *fl1h = l1fh->fl1h; + int rc; + + if (!msg) + return -ENOMEM; + + msg->l1h = msg->data; + + l1fh->remote_sa_len = sizeof(l1fh->remote_sa); + rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0, + (struct sockaddr *) &l1fh->remote_sa, &l1fh->remote_sa_len); + if (rc < 0) { + perror("read from udp"); + msgb_free(msg); + return rc; + } else if (rc == 0) { + perror("len=0 read from udp"); + msgb_free(msg); + return rc; + } + msgb_put(msg, rc); + + DEBUGP(DL1C, "UDP: Received %u bytes for %s queue\n", rc, + ofd->priv_nr == MQ_SYS_WRITE ? "SYS" : "L1"); + + /* put the message into the right queue */ + if (ofd->priv_nr == MQ_SYS_WRITE) + rc = osmo_wqueue_enqueue(&fl1h->write_q[MQ_SYS_WRITE], msg); + else + rc = osmo_wqueue_enqueue(&fl1h->write_q[MQ_L1_WRITE], msg); + + return rc; +} + +/* callback when we can write to the UDP socket */ +static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg) +{ + int rc; + struct l1fwd_hdl *l1fh = ofd->data; + + DEBUGP(DL1C, "UDP: Writing %u bytes for %s queue\n", msgb_l1len(msg), + ofd->priv_nr == MQ_SYS_WRITE ? "SYS" : "L1"); + + rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0, + (const struct sockaddr *)&l1fh->remote_sa, l1fh->remote_sa_len); + if (rc < 0) { + LOGP(DL1C, LOGL_ERROR, "error writing to L1 msg_queue: %s\n", + strerror(errno)); + return rc; + } else if (rc < msgb_l1len(msg)) { + LOGP(DL1C, LOGL_ERROR, "short write to L1 msg_queue: " + "%u < %u\n", rc, msgb_l1len(msg)); + return -EIO; + } + + return 0; +} + +int main(int argc, char **argv) +{ + struct l1fwd_hdl *l1fh; + struct femtol1_hdl *fl1h; + int rc, i; + + printf("sizeof(GsmL1_Prim_t) = %lu\n", sizeof(GsmL1_Prim_t)); + printf("sizeof(FemtoBts_Prim_t) = %lu\n", sizeof(FemtoBts_Prim_t)); + + bts_log_init(NULL); + + /* allocate new femtol1_handle */ + fl1h = talloc_zero(NULL, struct femtol1_hdl); + INIT_LLIST_HEAD(&fl1h->wlc_list); + + /* open the actual hardware transport */ + rc = l1if_transport_open(fl1h); + if (rc < 0) + exit(1); + + /* create our fwd handle */ + l1fh = talloc_zero(NULL, struct l1fwd_hdl); + + l1fh->fl1h = fl1h; + fl1h->priv = l1fh; + + /* Open UDP */ + for (i = 0; i < 2; i++) { + struct osmo_wqueue *wq = &l1fh->udp_wq[i]; + + osmo_wqueue_init(wq, 10); + wq->write_cb = udp_write_cb; + wq->read_cb = udp_read_cb; + + wq->bfd.when |= BSC_FD_READ; + wq->bfd.data = l1fh; + wq->bfd.priv_nr = i; + rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM, + IPPROTO_UDP, NULL, fwd_udp_ports[i], + OSMO_SOCK_F_BIND); + if (rc < 0) { + perror("sock_init"); + exit(1); + } + } + + while (1) { + rc = osmo_select_main(0); + if (rc < 0) { + perror("select"); + exit(1); + } + } + exit(0); +} |