From 2a711887b7e91893555891e5c033189d6705eec3 Mon Sep 17 00:00:00 2001 From: Yves Godin Date: Thu, 12 Nov 2015 08:32:07 -0500 Subject: LC15: Add initial support for the NuRAN Wireless Litecell 1.5 This commit adds basic support for the Litecell 1.5. Multi-TRX is not supported yet. Instead, multiple instances of the BTS can be launched using command line parameter -n to specify if TRX 1 or 2 must be used by the bts. Note that only TRX 1 opens a connection to the PCU. Full support for GPRS on both TRX will come at the same time than the multi-TRX support. The BTS manager has been adapted to match the new hardware but otherwise it has not been improved or changed compared to the one used on the SuperFemto/Litecell (sysmobts). --- src/osmo-bts-litecell15/l1_transp_hw.c | 320 +++++++++++++++++++++++++++++++++ 1 file changed, 320 insertions(+) create mode 100644 src/osmo-bts-litecell15/l1_transp_hw.c (limited to 'src/osmo-bts-litecell15/l1_transp_hw.c') diff --git a/src/osmo-bts-litecell15/l1_transp_hw.c b/src/osmo-bts-litecell15/l1_transp_hw.c new file mode 100644 index 00000000..00f1e0a3 --- /dev/null +++ b/src/osmo-bts-litecell15/l1_transp_hw.c @@ -0,0 +1,320 @@ +/* Interface handler for Nuran Wireless Litecell 1.5 L1 (real hardware) */ + +/* Copyright (C) 2015 by Yves Godin + * + * Based on sysmoBTS: + * (C) 2011 by Harald Welte + * + * 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 . + * + */ + +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include +#include + +#include "lc15bts.h" +#include "l1_if.h" +#include "l1_transp.h" + + +#define DEV_SYS_DSP2ARM_NAME "/dev/msgq/litecell15_dsp2arm_trx" +#define DEV_SYS_ARM2DSP_NAME "/dev/msgq/litecell15_arm2dsp_trx" +#define DEV_L1_DSP2ARM_NAME "/dev/msgq/gsml1_sig_dsp2arm_trx" +#define DEV_L1_ARM2DSP_NAME "/dev/msgq/gsml1_sig_arm2dsp_trx" + +#define DEV_TCH_DSP2ARM_NAME "/dev/msgq/gsml1_tch_dsp2arm_trx" +#define DEV_TCH_ARM2DSP_NAME "/dev/msgq/gsml1_tch_arm2dsp_trx" +#define DEV_PDTCH_DSP2ARM_NAME "/dev/msgq/gsml1_pdtch_dsp2arm_trx" +#define DEV_PDTCH_ARM2DSP_NAME "/dev/msgq/gsml1_pdtch_arm2dsp_trx" + +static const char *rd_devnames[] = { + [MQ_SYS_READ] = DEV_SYS_DSP2ARM_NAME, + [MQ_L1_READ] = DEV_L1_DSP2ARM_NAME, + [MQ_TCH_READ] = DEV_TCH_DSP2ARM_NAME, + [MQ_PDTCH_READ] = DEV_PDTCH_DSP2ARM_NAME, +}; + +static const char *wr_devnames[] = { + [MQ_SYS_WRITE] = DEV_SYS_ARM2DSP_NAME, + [MQ_L1_WRITE] = DEV_L1_ARM2DSP_NAME, + [MQ_TCH_WRITE] = DEV_TCH_ARM2DSP_NAME, + [MQ_PDTCH_WRITE]= DEV_PDTCH_ARM2DSP_NAME, +}; + +/* + * Make sure that all structs we read fit into the LC15BTS_PRIM_SIZE + */ +osmo_static_assert(sizeof(GsmL1_Prim_t) + 128 <= LC15BTS_PRIM_SIZE, l1_prim) +osmo_static_assert(sizeof(Litecell15_Prim_t) + 128 <= LC15BTS_PRIM_SIZE, super_prim) + +static int wqueue_vector_cb(struct osmo_fd *fd, unsigned int what) +{ + struct osmo_wqueue *queue; + + queue = container_of(fd, struct osmo_wqueue, bfd); + + if (what & BSC_FD_READ) + queue->read_cb(fd); + + if (what & BSC_FD_EXCEPT) + queue->except_cb(fd); + + if (what & BSC_FD_WRITE) { + struct iovec iov[5]; + struct msgb *msg, *tmp; + int written, count = 0; + + fd->when &= ~BSC_FD_WRITE; + + llist_for_each_entry(msg, &queue->msg_queue, list) { + /* more writes than we have */ + if (count >= ARRAY_SIZE(iov)) + break; + + iov[count].iov_base = msg->l1h; + iov[count].iov_len = msgb_l1len(msg); + count += 1; + } + + /* TODO: check if all lengths are the same. */ + + + /* Nothing scheduled? This should not happen. */ + if (count == 0) { + if (!llist_empty(&queue->msg_queue)) + fd->when |= BSC_FD_WRITE; + return 0; + } + + written = writev(fd->fd, iov, count); + if (written < 0) { + /* nothing written?! */ + if (!llist_empty(&queue->msg_queue)) + fd->when |= BSC_FD_WRITE; + return 0; + } + + /* now delete the written entries */ + written = written / iov[0].iov_len; + count = 0; + llist_for_each_entry_safe(msg, tmp, &queue->msg_queue, list) { + queue->current_length -= 1; + + llist_del(&msg->list); + msgb_free(msg); + + count += 1; + if (count >= written) + break; + } + + if (!llist_empty(&queue->msg_queue)) + fd->when |= BSC_FD_WRITE; + } + + return 0; +} + +static int prim_size_for_queue(int queue) +{ + switch (queue) { + case MQ_SYS_WRITE: + return sizeof(Litecell15_Prim_t); + case MQ_L1_WRITE: + case MQ_TCH_WRITE: + case MQ_PDTCH_WRITE: + return sizeof(GsmL1_Prim_t); + default: + /* The compiler can't know that priv_nr is an enum. Assist. */ + LOGP(DL1C, LOGL_FATAL, "writing on a wrong queue: %d\n", + queue); + assert(false); + break; + } +} + +/* callback when there's something to read from the l1 msg_queue */ +static int read_dispatch_one(struct lc15l1_hdl *fl1h, struct msgb *msg, int queue) +{ + switch (queue) { + case MQ_SYS_WRITE: + return l1if_handle_sysprim(fl1h, msg); + case MQ_L1_WRITE: + case MQ_TCH_WRITE: + case MQ_PDTCH_WRITE: + return l1if_handle_l1prim(queue, fl1h, msg); + default: + /* The compiler can't know that priv_nr is an enum. Assist. */ + LOGP(DL1C, LOGL_FATAL, "writing on a wrong queue: %d\n", + queue); + assert(false); + break; + } +}; + +static int l1if_fd_cb(struct osmo_fd *ofd, unsigned int what) +{ + int i, rc; + + const uint32_t prim_size = prim_size_for_queue(ofd->priv_nr); + uint32_t count; + + struct iovec iov[3]; + struct msgb *msg[ARRAY_SIZE(iov)]; + + for (i = 0; i < ARRAY_SIZE(iov); ++i) { + msg[i] = msgb_alloc_headroom(prim_size + 128, 128, "1l_fd"); + msg[i]->l1h = msg[i]->data; + + iov[i].iov_base = msg[i]->l1h; + iov[i].iov_len = msgb_tailroom(msg[i]); + } + + + rc = readv(ofd->fd, iov, ARRAY_SIZE(iov)); + count = rc / prim_size; + + for (i = 0; i < count; ++i) { + msgb_put(msg[i], prim_size); + read_dispatch_one(ofd->data, msg[i], ofd->priv_nr); + } + + for (i = count; i < ARRAY_SIZE(iov); ++i) + msgb_free(msg[i]); + + return 1; +} + +/* callback when we can write to one of the l1 msg_queue devices */ +static int l1fd_write_cb(struct osmo_fd *ofd, struct msgb *msg) +{ + int rc; + + rc = write(ofd->fd, msg->l1h, msgb_l1len(msg)); + if (rc < 0) { + LOGP(DL1C, LOGL_ERROR, "error writing to L1 msg_queue: %s\n", + strerror(errno)); + return rc; + } else if (rc < msg->len) { + LOGP(DL1C, LOGL_ERROR, "short write to L1 msg_queue: " + "%u < %u\n", rc, msg->len); + return -EIO; + } + + return 0; +} + +int l1if_transport_open(int q, struct lc15l1_hdl *hdl) +{ + int rc; + char buf[PATH_MAX]; + + /* Step 1: Open all msg_queue file descriptors */ + struct osmo_fd *read_ofd = &hdl->read_ofd[q]; + struct osmo_wqueue *wq = &hdl->write_q[q]; + struct osmo_fd *write_ofd = &hdl->write_q[q].bfd; + + snprintf(buf, sizeof(buf)-1, "%s%d", rd_devnames[q], hdl->hw_info.trx_nr); + buf[sizeof(buf)-1] = '\0'; + + rc = open(buf, O_RDONLY); + if (rc < 0) { + LOGP(DL1C, LOGL_FATAL, "unable to open msg_queue %s: %s\n", + rd_devnames[q], + strerror(errno)); + return rc; + } + read_ofd->fd = rc; + read_ofd->priv_nr = q; + read_ofd->data = hdl; + read_ofd->cb = l1if_fd_cb; + read_ofd->when = BSC_FD_READ; + rc = osmo_fd_register(read_ofd); + if (rc < 0) { + close(read_ofd->fd); + read_ofd->fd = -1; + return rc; + } + + snprintf(buf, sizeof(buf)-1, "%s%d", wr_devnames[q], hdl->hw_info.trx_nr); + buf[sizeof(buf)-1] = '\0'; + + rc = open(buf, O_WRONLY); + if (rc < 0) { + LOGP(DL1C, LOGL_FATAL, "unable to open msg_queue %s: %s\n", + wr_devnames[q], + strerror(errno)); + goto out_read; + } + osmo_wqueue_init(wq, 10); + wq->write_cb = l1fd_write_cb; + write_ofd->cb = wqueue_vector_cb; + write_ofd->fd = rc; + write_ofd->priv_nr = q; + write_ofd->data = hdl; + write_ofd->when = BSC_FD_WRITE; + rc = osmo_fd_register(write_ofd); + if (rc < 0) { + close(write_ofd->fd); + write_ofd->fd = -1; + goto out_read; + } + + return 0; + +out_read: + close(hdl->read_ofd[q].fd); + osmo_fd_unregister(&hdl->read_ofd[q]); + + return rc; +} + +int l1if_transport_close(int q, struct lc15l1_hdl *hdl) +{ + struct osmo_fd *read_ofd = &hdl->read_ofd[q]; + struct osmo_fd *write_ofd = &hdl->write_q[q].bfd; + + osmo_fd_unregister(read_ofd); + close(read_ofd->fd); + read_ofd->fd = -1; + + osmo_fd_unregister(write_ofd); + close(write_ofd->fd); + write_ofd->fd = -1; + + return 0; +} -- cgit v1.2.3