3 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.


proxy: implement burst forwarding (proxying) logic

Implement osmo_trx_ep_rx_burst_req(): forward a Tx burst request
immediately (no per-endpoint queueing yet) to every other powered-on
endpoint/channel whose Rx frequency matches the source channel's Tx
frequency.  Hard bits are converted to soft bits via osmo_ubit2sbit();
toa256/rssi are left at placeholder nominal values until the upcoming
path simulation logic computes them for real.

Change-Id: I1df0389ef523a59402081deb8f74b84e136ea7dd
Related: OS#6672
---
M proxy/src/Makefile.am
A proxy/src/burst_fwd.c
2 files changed, 100 insertions(+), 0 deletions(-)

diff --git a/proxy/src/Makefile.am b/proxy/src/Makefile.am
index 4be255f..5c8b931 100644
--- a/proxy/src/Makefile.am
+++ b/proxy/src/Makefile.am
@@ -20,6 +20,7 @@
 	trx.c \
 	clck_gen.c \
 	ctrl_cmd.c \
+	burst_fwd.c \
 	logging.c \
 	$(NULL)
 
diff --git a/proxy/src/burst_fwd.c b/proxy/src/burst_fwd.c
new file mode 100644
index 0000000..2a9f22d
--- /dev/null
+++ b/proxy/src/burst_fwd.c
@@ -0,0 +1,99 @@
+/*! \file src/burst_fwd.c
+ * osmo-trx-proxy: forward Tx bursts by Rx/Tx frequency match. */
+
+/*
+ * (C) 2026 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * Author: Vadim Yanitskiy <vyanitskiy@sysmocom.de>
+ *
+ * All Rights Reserved
+ *
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ *
+ * 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 Affero 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 <string.h>
+
+#include <osmocom/core/bits.h>
+#include <osmocom/core/linuxlist.h>
+
+#include <osmocom/trx/ep.h>
+
+#include <osmocom/proxy/proxy.h>
+#include <osmocom/proxy/trx.h>
+#include <osmocom/proxy/logging.h>
+
+/* Placeholder measurement values, until path_sim.c computes them for real
+ * (matches fake_trx.py's FakeTRX nominal defaults: no timing offset, and
+ * -60 dBm = 50 dBm nominal Tx power - 0 dB Tx attenuation - 110 dB path loss). */
+#define BURST_FWD_TOA256_DEFAULT	0
+#define BURST_FWD_RSSI_DEFAULT		-60
+
+#define OSMO_TRXD_F_COMMON_MASK	( \
+	OSMO_TRXD_F_NOPE_REQ	| \
+	OSMO_TRXD_F_MOD_TYPE	| \
+	OSMO_TRXD_F_TS_INFO	| \
+	OSMO_TRXD_F_TRX_NUM	  \
+	)
+
+static void burst_fwd_to_chan(struct proxy_trx *dst, unsigned int dst_chan,
+			      const struct osmo_trxd_burst_req *br)
+{
+	struct osmo_trxd_burst_ind bi = {
+		.flags = br->flags & OSMO_TRXD_F_COMMON_MASK,
+		.fn = br->fn,
+		.tn = br->tn,
+		.toa256 = BURST_FWD_TOA256_DEFAULT,
+		.rssi = BURST_FWD_RSSI_DEFAULT,
+		.burst_len = br->burst_len,
+		.mod = br->mod,
+		.tsc_set = br->tsc_set,
+		.tsc = br->tsc,
+		.trx_num = br->trx_num,
+	};
+
+	osmo_ubit2sbit(bi.burst, br->burst, br->burst_len);
+
+	osmo_trx_ep_send_burst_ind(dst->ep, dst_chan, &bi);
+}
+
+/*! Forward a Tx burst request to every powered-on endpoint/channel
+ * whose Rx frequency matches the source channel's Tx frequency.
+ * TODO: (no frequency hopping support yet, see SETFH in fake_trx.py). */
+void osmo_trx_ep_rx_burst_req(struct osmo_trx_ep *ep, unsigned int chan,
+			      const struct osmo_trxd_burst_req *br)
+{
+	const struct proxy_trx *src = osmo_trx_ep_get_priv(ep);
+	const uint32_t tx_freq = src->chans[chan].tx_freq;
+	struct proxy_trx *dst;
+
+	if (!src->powered) {
+		LOGP_TRXCH(src, chan, DTRXD, LOGL_NOTICE,
+			   "Rx BURST.req while not powered on, dropping\n");
+		return;
+	}
+
+	llist_for_each_entry(dst, &g_proxy_ctx->trx_list, list) {
+		unsigned int dst_chan;
+
+		if (dst == src || !dst->powered)
+			continue;
+
+		for (dst_chan = 0; dst_chan < dst->num_chans; dst_chan++) {
+			if (dst->chans[dst_chan].rx_freq != tx_freq)
+				continue;
+			burst_fwd_to_chan(dst, dst_chan, br);
+		}
+	}
+}

