From 20006003431d7260b04964eb684b1746ffb0a85f Mon Sep 17 00:00:00 2001
From: Eric Blossom <eb@comsec.com>
Date: Fri, 4 Sep 2009 03:48:15 -0700
Subject: [PATCH] stop sending short ethernet command packets.

---
 usrp2/host/lib/usrp2_impl.cc | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/usrp2/host/lib/usrp2_impl.cc b/usrp2/host/lib/usrp2_impl.cc
index d1e85805..3d030432 100644
--- a/usrp2/host/lib/usrp2_impl.cc
+++ b/usrp2/host/lib/usrp2_impl.cc
@@ -300,8 +300,19 @@ namespace usrp2 {
 
 
   bool
-  usrp2::impl::transmit_cmd(void *cmd, size_t len)
+  usrp2::impl::transmit_cmd(void *cmd_, size_t len_)
   {
+    const void *cmd = cmd_;
+    int len = len_;
+    unsigned char tmp[64];
+
+    if (len_ < 64){		// pad to minimum ethernet frame size
+      memset(tmp, 0, sizeof(tmp));
+      memcpy(tmp, cmd_, len_);
+      cmd = tmp;
+      len = sizeof(tmp);
+    }
+
     return d_eth_buf->tx_frame(cmd, len) == eth_buffer::EB_OK;
   }
 
-- 
2.30.2