In order to support multiple TRX, multiple RSL connections can be establised. e1inp_ipa_bts_rsl_connect() requires an additional parameter to set the TRX number.

The ts[] array (member of struct e1inp_line) refers to OML and RSL. ts[0] refers to OML link, ts[1] to RSL link of first TRX, ts[2] to RSL link of second TRX (if exists) and so on.

The code was successfully tested with osmobts-trx and UmTRX with two transceivers.

The user of e1inp_ipa_bts_rsl_connect() (which is osmo-bts) must be upgraded after applying the patch.

src/common/oml.c - rc = e1inp_ipa_bts_rsl_connect(oml_link->ts->line, inet_ntoa(in), port); + rc = e1inp_ipa_bts_rsl_connect(oml_link->ts->line, inet_ntoa(in), port, + trx->nr); --- include/osmocom/abis/e1_input.h | 3 ++- src/input/ipaccess.c | 30 +++++++++++++++++++++++------- tests/e1inp_ipa_bts_test.c | 2 +- 3 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/include/osmocom/abis/e1_input.h b/include/osmocom/abis/e1_input.h index 9b77893..7fbffe9 100644 --- a/include/osmocom/abis/e1_input.h +++ b/include/osmocom/abis/e1_input.h @@ -265,7 +265,8 @@ struct subch_mux *e1inp_get_mux(uint8_t e1_nr, uint8_t ts_nr); /* on an IPA BTS, the BTS needs to establish the RSL connection much * later than the OML connection. */ int e1inp_ipa_bts_rsl_connect(struct e1inp_line *line, - const char *rem_addr, uint16_t rem_port); + const char *rem_addr, uint16_t rem_port, + uint8_t trx_id);

void e1inp_sign_link_destroy(struct e1inp_sign_link *link); int e1inp_line_update(struct e1inp_line *line); diff --git a/src/input/ipaccess.c b/src/input/ipaccess.c index 07b47b2..4091d09 100644 --- a/src/input/ipaccess.c +++ b/src/input/ipaccess.c @@ -774,7 +774,7 @@ err_line: #define IPA_STRING_MAX 64

static struct msgb * -ipa_bts_id_resp(struct ipaccess_unit *dev, uint8_t *data, int len) +ipa_bts_id_resp(struct ipaccess_unit *dev, uint8_t *data, int len, int trx_nr) { struct msgb *nmsg; char str[IPA_STRING_MAX]; @@ -795,7 +795,7 @@ ipa_bts_id_resp(struct ipaccess_unit *dev, uint8_t *data, int len) switch (data[1]) { case IPAC_IDTAG_UNIT: snprintf(str, sizeof(str), "%u/%u/%u", - dev->site_id, dev->bts_id, dev->trx_id); + dev->site_id, dev->bts_id, trx_nr); break; case IPAC_IDTAG_MACADDR: snprintf(str, sizeof(str), @@ -895,6 +895,7 @@ static int ipaccess_bts_read_cb(struct ipa_client_conn *link, struct msgb *msg) struct e1inp_sign_link *sign_link; uint8_t *data = msgb_l2(msg); int len = msgb_l2len(msg); + int trx_nr = 0;

LOGP(DLINP, LOGL_NOTICE, "received ID get\n"); if (!link->line->ops->sign_link_up) { @@ -904,8 +905,10 @@ static int ipaccess_bts_read_cb(struct ipa_client_conn *link, struct msgb *msg) ret = -EINVAL; goto err; } + if (link->ofd->priv_nr >= E1INP_SIGN_RSL) + trx_nr = link->ofd->priv_nr - E1INP_SIGN_RSL; rmsg = ipa_bts_id_resp(link->line->ops->cfg.ipa.dev, - data + 1, len - 1); + data + 1, len - 1, trx_nr); ret = ipaccess_send(link->ofd->fd, rmsg->data, rmsg->len); if (ret != rmsg->len) { @@ -942,7 +945,7 @@ static int ipaccess_bts_read_cb(struct ipa_client_conn *link, struct msgb *msg) } else if (link->port == IPA_TCP_PORT_OML) e1i_ts = &link->line->ts[0]; else if (link->port == IPA_TCP_PORT_RSL) - e1i_ts = &link->line->ts[1]; + e1i_ts = &link->line->ts[link->ofd->priv_nr-1];

OSMO_ASSERT(e1i_ts != NULL);

@@ -1073,13 +1076,26 @@ static int ipaccess_line_update(struct e1inp_line *line) }

int e1inp_ipa_bts_rsl_connect(struct e1inp_line *line, - const char *rem_addr, uint16_t rem_port) + const char *rem_addr, uint16_t rem_port, + uint8_t trx_nr) { struct ipa_client_conn *rsl_link;

+ if (E1INP_SIGN_RSL+trx_nr-1 >= NUM_E1_TS) { + LOGP(DLINP, LOGL_ERROR, "cannot create RSL BTS link: " + "trx_nr (%d) out of range\n", trx_nr); + return -EINVAL; + } + if (line->ts[E1INP_SIGN_RSL+trx_nr-1].type != E1INP_TS_TYPE_SIGN) { + LOGP(DLINP, LOGL_ERROR, "cannot create RSL BTS link: " + "trx_nr (%d) does not refer to a signalling link\n", + trx_nr); + return -EINVAL; + } + rsl_link = ipa_client_conn_create(tall_ipa_ctx, - &line->ts[E1INP_SIGN_RSL-1], - E1INP_SIGN_RSL, + &line->ts[E1INP_SIGN_RSL+trx_nr-1], + E1INP_SIGN_RSL+trx_nr, rem_addr, rem_port, ipaccess_bts_updown_cb, ipaccess_bts_read_cb, diff --git a/tests/e1inp_ipa_bts_test.c b/tests/e1inp_ipa_bts_test.c index 02a4cb3..a43dba3 100644 --- a/tests/e1inp_ipa_bts_test.c +++ b/tests/e1inp_ipa_bts_test.c @@ -70,7 +70,7 @@ sign_link_up(void *unit, struct e1inp_line *line, enum e1inp_sign_type type) /* Now we can send OML messages to the BSC. */ bts_state = BTS_TEST_OML_SIGN_LINK_UP; } - e1inp_ipa_bts_rsl_connect(line, "127.0.0.1", IPA_TCP_PORT_RSL); + e1inp_ipa_bts_rsl_connect(line, "127.0.0.1", IPA_TCP_PORT_RSL, 0); break; case E1INP_SIGN_RSL: LOGP(DBTSTEST, LOGL_NOTICE, "RSL link up request received.\n");