samples: hssi: add loopback control of Hardware Exerciser

Add a parameter to enable/disable loopback in the Hardware
Exerciser as opposed to serial loopback in the phy.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>

samples/hssi/hssi_10g_cmd.h

@@ -56,6 +56,7 @@ class hssi_10g_cmd : public hssi_cmd
   hssi_10g_cmd()
     : port_(0)
     , eth_loopback_("on")
+    , he_loopback_("off")
     , num_packets_(1)
     , random_length_("fixed")
     , random_payload_("incremental")
@@ -88,6 +89,10 @@ class hssi_10g_cmd : public hssi_cmd
                     "whether to enable loopback on the eth interface");
     opt->check(CLI::IsMember({"on", "off"}))->default_val(eth_loopback_);
 
+    opt = app->add_option("--he-loopback", he_loopback_,
+                    "whether to enable loopback in the Hardware Exerciser (HE)");
+    opt->check(CLI::IsMember({"on", "off"}))->default_val(he_loopback_);
+
     opt = app->add_option("--num-packets", num_packets_,
                           "number of packets");
     opt->default_val(num_packets_);
@@ -154,6 +159,7 @@ class hssi_10g_cmd : public hssi_cmd
     std::cout << "10G loopback test" << std::endl
               << "  port: " << port_ << std::endl
               << "  eth_loopback: " << eth_loopback_ << std::endl
+              << "  he_loopback: " << he_loopback_ << std::endl
               << "  num_packets: " << num_packets_ << std::endl
               << "  packet_length: " << packet_length_ << std::endl
               << "  src_address: " << src_addr_ << std::endl
@@ -170,11 +176,17 @@ class hssi_10g_cmd : public hssi_cmd
 
     if (eth_loopback_ == "on")
       enable_eth_loopback(eth_ifc, true);
+    else
+      enable_eth_loopback(eth_ifc, false);
 
     hafu->mbox_write(CSR_STOP, 0);
 
     hafu->write64(TRAFFIC_CTRL_PORT_SEL, port_);
-    hafu->mbox_write(CSR_MAC_LOOP, 0);
+
+    if (he_loopback_ == "on")
+      hafu->mbox_write(CSR_MAC_LOOP, 1);
+    else 
+      hafu->mbox_write(CSR_MAC_LOOP, 0);
 
     hafu->mbox_write(CSR_NUM_PACKETS, num_packets_);
 
@@ -290,6 +302,7 @@ class hssi_10g_cmd : public hssi_cmd
 protected:
   uint32_t port_;
   std::string eth_loopback_;
+  std::string he_loopback_;
   uint32_t num_packets_;
   std::string random_length_;
   std::string random_payload_;