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bts-trx: define TRXD_MSG_BUF_SIZE as a more realistic lower value

Change-Id: Ic725e26637f8c116cfd5e64ff54d60a1d1bf9b87
---
M src/osmo-bts-trx/trx_if.h
1 file changed, 7 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/60/41660/1

diff --git a/src/osmo-bts-trx/trx_if.h b/src/osmo-bts-trx/trx_if.h
index 13c537d..5f96ea2 100644
--- a/src/osmo-bts-trx/trx_if.h
+++ b/src/osmo-bts-trx/trx_if.h
@@ -1,9 +1,14 @@
 #pragma once
 
+#include <osmocom/core/utils.h>
+
 /* TRXC read/send buffer size */
 #define TRXC_MSG_BUF_SIZE	1500
-/* TRXD read/send buffer size (max. IPv4 MTU) */
-#define TRXD_MSG_BUF_SIZE	65535U
+/* TRXD read/send buffer size: (2*GSM_BURST_LEN = VAMOS)
+ * NOTE: a legacy transceiver may append two garbage bytes.
+ * This ends up being (444+2)*8 = 3568 bytes */
+#define TRXD_BURST_SIZE_MAX	OSMO_MAX(2 * (GSM_BURST_LEN + 2), (EGPRS_BURST_LEN + 2))
+#define TRXD_MSG_BUF_SIZE	(TRXD_BURST_SIZE_MAX * TRX_NR_TS)
 
 struct trx_dl_burst_req;
 struct trx_l1h;

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