dev: Add a version of EtherTap which uses the tap driver.

The object is called EtherTap (as opposed to EtherTapStub, what the former
EtherTap was renamed to), and its existance is gated on the linux/if_tun.h
header file existing. That's probably overly strict, but it will hopefully
be minimally likely to break the build for other systems.

Change-Id: Ie03507fadf0d843a4d4d52f283c44a416c6f2a74
Reviewed-on: https://gem5-review.googlesource.com/3646
Reviewed-by: Nathan Binkert <nate@binkert.org>
Maintainer: Nathan Binkert <nate@binkert.org>

SConstruct

diff --git a/SConstruct b/SConstruct
index 65179f1..ef7af0f 100755
--- a/SConstruct
+++ b/SConstruct
@@ -1101,6 +1101,11 @@
     print "Info: Compatible header file <linux/kvm.h> not found, " \
         "disabling KVM support."
 
+# Check if the TUN/TAP driver is available.
+have_tuntap = conf.CheckHeader('linux/if_tun.h', '<>')
+if not have_tuntap:
+    print "Info: Compatible header file <linux/if_tun.h> not found."
+
 # x86 needs support for xsave. We test for the structure here since we
 # won't be able to run new tests by the time we know which ISA we're
 # targeting.
@@ -1233,6 +1238,9 @@
     BoolVariable('USE_FENV', 'Use <fenv.h> IEEE mode control', have_fenv),
     BoolVariable('CP_ANNOTATE', 'Enable critical path annotation capability', False),
     BoolVariable('USE_KVM', 'Enable hardware virtualized (KVM) CPU models', have_kvm),
+    BoolVariable('USE_TUNTAP',
+                 'Enable using a tap device to bridge to the host network',
+                 have_tuntap),
     BoolVariable('BUILD_GPU', 'Build the compute-GPU model', False),
     EnumVariable('PROTOCOL', 'Coherence protocol for Ruby', 'None',
                   all_protocols),
@@ -1477,6 +1485,11 @@
                 "target ISA combination"
             env['USE_KVM'] = False
 
+    if env['USE_TUNTAP']:
+        if not have_tuntap:
+            print "Warning: Can't connect EtherTap with a tap device."
+            env['USE_TUNTAP'] = False
+
     if env['BUILD_GPU']:
         env.Append(CPPDEFINES=['BUILD_GPU'])