From 2960e559515348dce83bfdbdd6ef39e551235045 Mon Sep 17 00:00:00 2001
From: Sugandha Gupta <sugandha.gupta@ettus.com>
Date: Fri, 25 Jan 2019 17:36:26 -0800
Subject: device3: Constraint send/recv_frame_size based on down/upstream MTU

We need to properly contraint the send/recv_frame_size based on the
minimum MTU of all the down/upstream blocks. This fixes the issue with
E310 tx/rx streaming as it has smaller MTU sizes than the other usrps.
---
 host/lib/usrp/e300/e300_impl.cpp | 5 +++++
 host/lib/usrp/e300/e300_impl.hpp | 3 +++
 2 files changed, 8 insertions(+)

(limited to 'host/lib/usrp/e300')

diff --git a/host/lib/usrp/e300/e300_impl.cpp b/host/lib/usrp/e300/e300_impl.cpp
index 59a8cec88..5a6376039 100644
--- a/host/lib/usrp/e300/e300_impl.cpp
+++ b/host/lib/usrp/e300/e300_impl.cpp
@@ -731,6 +731,11 @@ uhd::both_xports_t e300_impl::make_transport(
     return xports;
 }
 
+size_t e300_impl::get_mtu(const size_t /*mb_index*/, const uhd::direction_t dir) {
+    return (dir == RX_DIRECTION) ? _data_xport_params.recv_frame_size :
+            _data_xport_params.send_frame_size;
+}
+
 void e300_impl::_update_clock_source(const std::string &source)
 {
     if (source != "internal") {
diff --git a/host/lib/usrp/e300/e300_impl.hpp b/host/lib/usrp/e300/e300_impl.hpp
index 2e919cf9b..0a6f153eb 100644
--- a/host/lib/usrp/e300/e300_impl.hpp
+++ b/host/lib/usrp/e300/e300_impl.hpp
@@ -166,6 +166,9 @@ private: // methods
         return uhd::ENDIANNESS_LITTLE;
     };
 
+    //! get mtu
+    size_t get_mtu(const size_t, const uhd::direction_t);
+
     /************************************************************************
      * Helpers
      ***********************************************************************/
-- 
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