| /* OpenBSC Abis input driver for DAHDI */ |
| |
| /* (C) 2008-2011 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2010 by Digium and Matthew Fredrickson <creslin@digium.com> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include "config.h" |
| |
| #ifdef HAVE_DAHDI_USER_H |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| #include <string.h> |
| #include <time.h> |
| #include <sys/fcntl.h> |
| #include <sys/socket.h> |
| #include <sys/ioctl.h> |
| #include <arpa/inet.h> |
| #include <dahdi/user.h> |
| |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/signal.h> |
| #include <osmocom/core/rate_ctr.h> |
| |
| #include <osmocom/vty/vty.h> |
| |
| #include <osmocom/abis/subchan_demux.h> |
| #include <osmocom/abis/e1_input.h> |
| |
| #include <osmocom/abis/lapd.h> |
| |
| #define TS1_ALLOC_SIZE 300 |
| |
| struct span_cfg { |
| struct llist_head list; |
| |
| unsigned int span_nr; |
| unsigned int chan_base; |
| unsigned int chan_num; |
| }; |
| |
| static struct span_cfg *span_cfgs[DAHDI_MAX_SPANS]; |
| |
| static int reread_span_cfgs(void) |
| { |
| struct dahdi_spaninfo si; |
| unsigned int basechan = 1; |
| int span_nr; |
| int fd; |
| |
| if ((fd = open("/dev/dahdi/ctl", O_RDWR)) < 0) { |
| LOGP(DLMI, LOGL_ERROR, "Unable to open DAHDI ctl: %s\n", |
| strerror(errno)); |
| return -EIO; |
| } |
| |
| for (span_nr = 1; span_nr < DAHDI_MAX_SPANS; span_nr++) { |
| struct span_cfg *scfg; |
| /* our array index starts at 0, but DAHDI span at 1 */ |
| int i = span_nr - 1; |
| |
| /* clear any old cached information */ |
| if (span_cfgs[i]) { |
| talloc_free(span_cfgs[i]); |
| span_cfgs[i] = NULL; |
| } |
| |
| memset(&si, 0, sizeof(si)); |
| si.spanno = span_nr; |
| if (ioctl(fd, DAHDI_SPANSTAT, &si)) |
| continue; |
| |
| /* create and link new span_cfg */ |
| scfg = talloc_zero(NULL, struct span_cfg); |
| if (!scfg) { |
| close(fd); |
| return -ENOMEM; |
| } |
| scfg->span_nr = span_nr; |
| scfg->chan_num = si.totalchans; |
| scfg->chan_base = basechan; |
| span_cfgs[i] = scfg; |
| |
| basechan += si.totalchans; |
| } |
| |
| close(fd); |
| |
| return 0; |
| } |
| |
| /* Corresponds to dahdi/user.h, only PRI related events */ |
| static const struct value_string dahdi_evt_names[] = { |
| { DAHDI_EVENT_NONE, "NONE" }, |
| { DAHDI_EVENT_ALARM, "ALARM" }, |
| { DAHDI_EVENT_NOALARM, "NOALARM" }, |
| { DAHDI_EVENT_ABORT, "HDLC ABORT" }, |
| { DAHDI_EVENT_OVERRUN, "HDLC OVERRUN" }, |
| { DAHDI_EVENT_BADFCS, "HDLC BAD FCS" }, |
| { DAHDI_EVENT_REMOVED, "REMOVED" }, |
| { 0, NULL } |
| }; |
| |
| static void handle_dahdi_exception(struct e1inp_ts *ts) |
| { |
| int rc, evt; |
| struct e1inp_line *line = ts->line; |
| struct input_signal_data isd; |
| |
| rc = ioctl(ts->driver.dahdi.fd.fd, DAHDI_GETEVENT, &evt); |
| if (rc < 0) |
| return; |
| |
| LOGP(DLMI, LOGL_NOTICE, "Line %u(%s) / TS %u DAHDI EVENT %s\n", |
| ts->line->num, ts->line->name, ts->num, |
| get_value_string(dahdi_evt_names, evt)); |
| |
| isd.line = ts->line; |
| |
| switch (evt) { |
| case DAHDI_EVENT_ALARM: |
| /* we should notify the code that the line is gone */ |
| osmo_signal_dispatch(SS_L_INPUT, S_L_INP_LINE_ALARM, &isd); |
| rate_ctr_inc(&line->rate_ctr->ctr[E1I_CTR_ALARM]); |
| break; |
| case DAHDI_EVENT_NOALARM: |
| /* alarm has gone, we should re-start the SABM requests */ |
| osmo_signal_dispatch(SS_L_INPUT, S_L_INP_LINE_NOALARM, &isd); |
| break; |
| case DAHDI_EVENT_ABORT: |
| rate_ctr_inc(&line->rate_ctr->ctr[E1I_CTR_HDLC_ABORT]); |
| break; |
| case DAHDI_EVENT_OVERRUN: |
| rate_ctr_inc(&line->rate_ctr->ctr[E1I_CTR_HDLC_OVERR]); |
| break; |
| case DAHDI_EVENT_BADFCS: |
| rate_ctr_inc(&line->rate_ctr->ctr[E1I_CTR_HDLC_BADFCS]); |
| break; |
| case DAHDI_EVENT_REMOVED: |
| rate_ctr_inc(&line->rate_ctr->ctr[E1I_CTR_REMOVED]); |
| break; |
| } |
| } |
| |
| static int handle_ts1_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "DAHDI TS1"); |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = read(bfd->fd, msg->data, TS1_ALLOC_SIZE - 16); |
| if (ret == -1) |
| handle_dahdi_exception(e1i_ts); |
| else if (ret < 0) { |
| perror("read "); |
| } |
| msgb_put(msg, ret - 2); |
| if (ret <= 3) { |
| perror("read "); |
| } |
| |
| return e1inp_rx_ts_lapd(e1i_ts, msg); |
| } |
| |
| static int ts_want_write(struct e1inp_ts *e1i_ts) |
| { |
| /* We never include the DAHDI B-Channel FD into the |
| * writeset, since it doesn't support poll() based |
| * write flow control */ |
| if (e1i_ts->type == E1INP_TS_TYPE_TRAU) { |
| LOGP(DLINP, LOGL_DEBUG, "Trying to write TRAU ts\n"); |
| return 0; |
| } |
| |
| e1i_ts->driver.dahdi.fd.when |= BSC_FD_WRITE; |
| |
| return 0; |
| } |
| |
| static void timeout_ts1_write(void *data) |
| { |
| struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data; |
| |
| /* trigger write of ts1, due to tx delay timer */ |
| ts_want_write(e1i_ts); |
| } |
| |
| static void dahdi_write_msg(struct msgb *msg, void *cbdata) |
| { |
| struct osmo_fd *bfd = cbdata; |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| int ret; |
| |
| ret = write(bfd->fd, msg->data, msg->len + 2); |
| msgb_free(msg); |
| if (ret == -1) |
| handle_dahdi_exception(e1i_ts); |
| else if (ret < 0) |
| LOGP(DLMI, LOGL_NOTICE, "%s write failed %d\n", __func__, ret); |
| } |
| |
| static int handle_ts1_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct e1inp_sign_link *sign_link; |
| struct msgb *msg; |
| |
| bfd->when &= ~BSC_FD_WRITE; |
| |
| /* get the next msg for this timeslot */ |
| msg = e1inp_tx_ts(e1i_ts, &sign_link); |
| if (!msg) { |
| /* no message after tx delay timer */ |
| return 0; |
| } |
| |
| DEBUGP(DLMI, "TX: %s\n", osmo_hexdump(msg->data, msg->len)); |
| lapd_transmit(e1i_ts->lapd, sign_link->tei, |
| sign_link->sapi, msg); |
| |
| /* set tx delay timer for next event */ |
| e1i_ts->sign.tx_timer.cb = timeout_ts1_write; |
| e1i_ts->sign.tx_timer.data = e1i_ts; |
| osmo_timer_schedule(&e1i_ts->sign.tx_timer, 0, 50000); |
| |
| return 0; |
| } |
| |
| |
| static int invertbits = 1; |
| |
| static uint8_t flip_table[256]; |
| |
| static void init_flip_bits(void) |
| { |
| int i,k; |
| |
| for (i = 0 ; i < 256 ; i++) { |
| uint8_t sample = 0 ; |
| for (k = 0; k<8; k++) { |
| if ( i & 1 << k ) sample |= 0x80 >> k; |
| } |
| flip_table[i] = sample; |
| } |
| } |
| |
| static uint8_t * flip_buf_bits ( uint8_t * buf , int len) |
| { |
| int i; |
| uint8_t * start = buf; |
| |
| for (i = 0 ; i < len; i++) { |
| buf[i] = flip_table[(uint8_t)buf[i]]; |
| } |
| |
| return start; |
| } |
| |
| #define D_BCHAN_TX_GRAN 160 |
| /* write to a B channel TS */ |
| static int handle_tsX_write(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| uint8_t tx_buf[D_BCHAN_TX_GRAN]; |
| struct subch_mux *mx = &e1i_ts->trau.mux; |
| int ret; |
| |
| ret = subchan_mux_out(mx, tx_buf, D_BCHAN_TX_GRAN); |
| |
| if (ret != D_BCHAN_TX_GRAN) { |
| LOGP(DLINP, LOGL_DEBUG, "Huh, got ret of %d\n", ret); |
| if (ret < 0) |
| return ret; |
| } |
| |
| DEBUGP(DLMIB, "BCHAN TX: %s\n", |
| osmo_hexdump(tx_buf, D_BCHAN_TX_GRAN)); |
| |
| if (invertbits) { |
| flip_buf_bits(tx_buf, ret); |
| } |
| |
| ret = write(bfd->fd, tx_buf, ret); |
| if (ret < D_BCHAN_TX_GRAN) |
| LOGP(DLINP, LOGL_DEBUG, "send returns %d instead of %d\n", |
| ret, D_BCHAN_TX_GRAN); |
| |
| return ret; |
| } |
| |
| #define D_TSX_ALLOC_SIZE (D_BCHAN_TX_GRAN) |
| /* FIXME: read from a B channel TS */ |
| static int handle_tsX_read(struct osmo_fd *bfd) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1]; |
| struct msgb *msg = msgb_alloc(D_TSX_ALLOC_SIZE, "DAHDI TSx"); |
| int ret; |
| |
| if (!msg) |
| return -ENOMEM; |
| |
| ret = read(bfd->fd, msg->data, D_TSX_ALLOC_SIZE); |
| if (ret < 0 || ret != D_TSX_ALLOC_SIZE) { |
| LOGP(DLINP, LOGL_DEBUG, "read error %d %s\n", |
| ret, strerror(errno)); |
| return ret; |
| } |
| |
| if (invertbits) { |
| flip_buf_bits(msg->data, ret); |
| } |
| |
| msgb_put(msg, ret); |
| |
| msg->l2h = msg->data; |
| DEBUGP(DLMIB, "BCHAN RX: %s\n", |
| osmo_hexdump(msgb_l2(msg), ret)); |
| ret = e1inp_rx_ts(e1i_ts, msg, 0, 0); |
| /* physical layer indicates that data has been sent, |
| * we thus can send some more data */ |
| ret = handle_tsX_write(bfd); |
| |
| return ret; |
| } |
| |
| /* callback from select.c in case one of the fd's can be read/written */ |
| static int dahdi_fd_cb(struct osmo_fd *bfd, unsigned int what) |
| { |
| struct e1inp_line *line = bfd->data; |
| unsigned int ts_nr = bfd->priv_nr; |
| unsigned int idx = ts_nr-1; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| int rc = 0; |
| |
| switch (e1i_ts->type) { |
| case E1INP_TS_TYPE_SIGN: |
| if (what & BSC_FD_EXCEPT) |
| handle_dahdi_exception(e1i_ts); |
| if (what & BSC_FD_READ) |
| rc = handle_ts1_read(bfd); |
| if (what & BSC_FD_WRITE) |
| rc = handle_ts1_write(bfd); |
| break; |
| case E1INP_TS_TYPE_TRAU: |
| if (what & BSC_FD_EXCEPT) |
| handle_dahdi_exception(e1i_ts); |
| if (what & BSC_FD_READ) |
| rc = handle_tsX_read(bfd); |
| if (what & BSC_FD_WRITE) |
| rc = handle_tsX_write(bfd); |
| /* We never include the DAHDI B-Channel FD into the |
| * writeset, since it doesn't support poll() based |
| * write flow control */ |
| break; |
| default: |
| LOGP(DLINP, LOGL_NOTICE, |
| "unknown E1 TS type %u\n", e1i_ts->type); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| static void dahdi_vty_show(struct vty *vty, struct e1inp_line *line) |
| { |
| struct span_cfg *scfg; |
| |
| if (line->port_nr >= ARRAY_SIZE(span_cfgs)) |
| return; |
| |
| scfg = span_cfgs[line->port_nr]; |
| if (!scfg) { |
| vty_out(vty, "DAHDI Span %u non-existant%s", |
| line->port_nr+1, VTY_NEWLINE); |
| return; |
| } |
| |
| vty_out(vty, "DAHDI Span #%u, Base Nr %u, Timeslots: %u%s", |
| line->port_nr+1, scfg->chan_base, scfg->chan_num, |
| VTY_NEWLINE); |
| } |
| |
| static int dahdi_e1_line_update(struct e1inp_line *line); |
| |
| struct e1inp_driver dahdi_driver = { |
| .name = "dahdi", |
| .want_write = ts_want_write, |
| .line_update = &dahdi_e1_line_update, |
| .vty_show = &dahdi_vty_show, |
| }; |
| |
| int dahdi_set_bufinfo(int fd, int as_sigchan) |
| { |
| struct dahdi_bufferinfo bi; |
| int x = 0; |
| |
| if (ioctl(fd, DAHDI_GET_BUFINFO, &bi)) { |
| LOGP(DLINP, LOGL_ERROR, "Error getting bufinfo\n"); |
| return -EIO; |
| } |
| |
| if (as_sigchan) { |
| bi.numbufs = 4; |
| bi.bufsize = 512; |
| } else { |
| bi.numbufs = 8; |
| bi.bufsize = D_BCHAN_TX_GRAN; |
| bi.txbufpolicy = DAHDI_POLICY_WHEN_FULL; |
| } |
| |
| if (ioctl(fd, DAHDI_SET_BUFINFO, &bi)) { |
| LOGP(DLINP, LOGL_ERROR, "Error setting bufinfo\n"); |
| return -EIO; |
| } |
| |
| if (!as_sigchan) { |
| if (ioctl(fd, DAHDI_AUDIOMODE, &x)) { |
| LOGP(DLINP, LOGL_ERROR, "Error setting bufinfo\n"); |
| return -EIO; |
| } |
| } else { |
| int one = 1; |
| ioctl(fd, DAHDI_HDLCFCSMODE, &one); |
| /* we cannot reliably check for the ioctl return value here |
| * as this command will fail if the slot _already_ was a |
| * signalling slot before :( */ |
| } |
| return 0; |
| } |
| |
| static int dahdi_e1_setup(struct e1inp_line *line) |
| { |
| struct span_cfg *scfg; |
| int ts, ret; |
| |
| reread_span_cfgs(); |
| |
| scfg = span_cfgs[line->port_nr]; |
| if (!scfg) { |
| LOGP(DLMI, LOGL_ERROR, "Line %u(%s): DAHDI Port %u (Span %u) " |
| "doesn't exist\n", line->num, line->name, line->port_nr, |
| line->port_nr+1); |
| return -EIO; |
| } |
| |
| line->num_ts = scfg->chan_num; |
| |
| /* TS0 is CRC4, don't need any fd for it */ |
| for (ts = 1; ts <= scfg->chan_num; ts++) { |
| unsigned int idx = ts-1; |
| char openstr[128]; |
| struct e1inp_ts *e1i_ts = &line->ts[idx]; |
| struct osmo_fd *bfd = &e1i_ts->driver.dahdi.fd; |
| int dev_nr; |
| |
| /* unregister FD if it was already registered */ |
| if (bfd->list.next && bfd->list.next != LLIST_POISON1) |
| osmo_fd_unregister(bfd); |
| |
| /* DAHDI device names/numbers just keep incrementing |
| * even over multiple boards. So TS1 of the second |
| * board will be 32 */ |
| dev_nr = scfg->chan_base + idx; |
| |
| bfd->data = line; |
| bfd->priv_nr = ts; |
| bfd->cb = dahdi_fd_cb; |
| snprintf(openstr, sizeof(openstr), "/dev/dahdi/%d", dev_nr); |
| |
| switch (e1i_ts->type) { |
| case E1INP_TS_TYPE_NONE: |
| /* close/release LAPD instance, if any */ |
| if (e1i_ts->lapd) { |
| lapd_instance_free(e1i_ts->lapd); |
| e1i_ts->lapd = NULL; |
| } |
| if (bfd->fd) { |
| close(bfd->fd); |
| bfd->fd = 0; |
| } |
| continue; |
| break; |
| case E1INP_TS_TYPE_SIGN: |
| if (!bfd->fd) |
| bfd->fd = open(openstr, O_RDWR | O_NONBLOCK); |
| if (bfd->fd == -1) { |
| LOGP(DLINP, LOGL_ERROR, |
| "%s could not open %s %s\n", |
| __func__, openstr, strerror(errno)); |
| return -EIO; |
| } |
| bfd->when = BSC_FD_READ | BSC_FD_EXCEPT; |
| ret = dahdi_set_bufinfo(bfd->fd, 1); |
| if (ret < 0) |
| return ret; |
| |
| if (!e1i_ts->lapd) |
| e1i_ts->lapd = lapd_instance_alloc(1, |
| dahdi_write_msg, bfd, e1inp_dlsap_up, |
| e1i_ts, &lapd_profile_abis); |
| break; |
| case E1INP_TS_TYPE_TRAU: |
| /* close/release LAPD instance, if any */ |
| if (e1i_ts->lapd) { |
| lapd_instance_free(e1i_ts->lapd); |
| e1i_ts->lapd = NULL; |
| } |
| if (!bfd->fd) |
| bfd->fd = open(openstr, O_RDWR | O_NONBLOCK); |
| if (bfd->fd == -1) { |
| LOGP(DLINP, LOGL_ERROR, |
| "%s could not open %s %s\n", |
| __func__, openstr, strerror(errno)); |
| return -EIO; |
| } |
| ret = dahdi_set_bufinfo(bfd->fd, 0); |
| if (ret < 0) |
| return -EIO; |
| /* We never include the DAHDI B-Channel FD into the |
| * writeset, since it doesn't support poll() based |
| * write flow control */ |
| bfd->when = BSC_FD_READ | BSC_FD_EXCEPT;// | BSC_FD_WRITE; |
| break; |
| } |
| |
| if (bfd->fd < 0) { |
| LOGP(DLINP, LOGL_ERROR, |
| "%s could not open %s %s\n", |
| __func__, openstr, strerror(errno)); |
| return bfd->fd; |
| } |
| |
| ret = osmo_fd_register(bfd); |
| if (ret < 0) { |
| LOGP(DLINP, LOGL_ERROR, |
| "could not register FD: %s\n", |
| strerror(ret)); |
| return ret; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int dahdi_e1_line_update(struct e1inp_line *line) |
| { |
| if (line->driver != &dahdi_driver) |
| return -EINVAL; |
| |
| return dahdi_e1_setup(line); |
| } |
| |
| int e1inp_dahdi_init(void) |
| { |
| init_flip_bits(); |
| |
| /* register the driver with the core */ |
| return e1inp_driver_register(&dahdi_driver); |
| } |
| |
| #endif /* HAVE_DAHDI_USER_H */ |