Date:   Thu, 25 Aug 2016 12:08:34 +0200
From:   Simon Horman <simon.horman@...ronome.com>
To:     Joe Stringer <joe@....org>
Cc:     pravin shelar <pshelar@....org>, ovs dev <dev@...nvswitch.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        Jiri Benc <jbenc@...hat.com>
Subject: Re: [ovs-dev] [PATCH net-next v11 5/6] openvswitch: add layer 3
 flow/port support

On Tue, Aug 23, 2016 at 10:51:47AM +0200, Simon Horman wrote:
> On Mon, Aug 22, 2016 at 02:47:42PM -0700, Joe Stringer wrote:
> > On 22 August 2016 at 04:04, Simon Horman <simon.horman@...ronome.com> wrote:
> > > On Wed, Aug 10, 2016 at 10:17:30AM -0700, Joe Stringer wrote:
> > >> On 10 August 2016 at 03:20, Simon Horman <simon.horman@...ronome.com> wrote:
> > >> > On Tue, Aug 09, 2016 at 08:47:40AM -0700, pravin shelar wrote:
> > >> >> On Mon, Aug 8, 2016 at 8:17 AM, Simon Horman <simon.horman@...ronome.com> wrote:
> > >> >> > Light testing seems to indicate that it works for GSO skbs
> > >> >> > received over both L3 and L2 GRE tunnels by OvS with both
> > >> >> > IP-in-MPLS and IP (without MPLS) payloads.
> > >> >> >
> > >> >>
> > >> >> Thanks for testing it. Can you also add those tests to OVS kmod test suite?
> > >> >> ..
> > >> >
> > >> > Sure, I will look into doing that.
> > >> > Am I correct in thinking Joe Stringer is the best person to contact if
> > >> > I run into trouble there?
> > >>
> > >> Sure. The basics of running the tests is documented here:
> > >> https://github.com/openvswitch/ovs/blob/master/INSTALL.md#datapath-testing
> > >>
> > >> You should be able to get a good feel for how to add tests by perusing
> > >> the commits to tests/system-{traffic,kmod-macros}.at in the OVS source
> > >> tree.
> > >
> > > Thanks Joe,
> > >
> > > it took me a while but I think that I have something working
> > > against the head branch of the OVS tree. I'd value opinions
> > > on the direction I have taken.
> > >
> > > Subject: [PATCH] system-traffic: Exercise GSO
> > >
> > > Exercise GSO for: unencapsulated; MPLS; GRE; and MPLS in GRE.
> > >
> > > There is scope to extend this testing to other encapsulation formats
> > > if desired.
> > >
> > > This is motivated by a desire to test GRE and MPLS encapsulation in
> > > the context of L3/VPN (MPLS over non-TEB GRE work). That is not
> > > tested here but tests for those cases would ideally be based on those in
> > > this patch.
> > 
> > This makes sense to me. There's a few corners that could be improved,
> > primarily for reproducing sane results on a variety of systems, then a
> > couple of style comments. Please do run the tests via both "make
> > check-kernel" and "make check-system-userspace" before submitting,
> > ideally with at least two varieties of kernel: One where you would
> > expect the test to pass, and one where you would expect the tests to
> > be skipped.

Both make check-kernel and make check-system-userspace are now working.
I have tested against net-next and the 3.16 kernel that ships with
Debian stable.

> Thanks. I'm glad I ran this by you before expanding the number of tests.
> 
> > * CHECK_MPLS is defined in system-kmod-macros.at, so a corresponding
> > version should be provided in system-userspace-macros.at. If the
> > criteria for running the test(s) with both userspace and kernel
> > datapaths is the same, then this could instead be moved into
> > system-common-macros.at.
> 
> Understood.
>
> > * "datapath - ping over gre tunnel" adds a command to execute in
> > at_ns1, but that namespace doesn't exist.
> 
> Oops.

I have removed the chunk in question, it seems to be an artifact
of my development of the tests.

> > * "datapath - http over gre tunnel" is missing MPLS_CHECK.
> 
> Thanks, I'll fix that.

On further inspection it seems tome that this check does not use MPLS,
rather it is testing GSO for GRE (without MPLS).

> > * Is there a way to clear the netstat statistics before running the
> > tests which rely on it? I'm getting a failure on one of my systems
> > (ubuntu trusty with a 4.7 kernel), but I'm not sure if the counter was
> > already high before I ran the test.
> 
> I'll look into that. If not they could be recorded to allow a check
> for a non-zero delta.
> 
> Possibly an entirely different mechanism is needed to check for GSO
> functioning. But I'm not sure what it would be at this point.
>
> > * "datapath - http over mpls between two ports"  (maybe others too?)
> > should shift all openflow rules into a single section using AT_DATA,
> > similar to the other tests. This makes it easier to reason about the
> > flow table and understand what's going on before reading through the
> > rest of the test.
> 
> Sure, will do.
> 
> > * If there is a common set of configuration you do for local stack
> > within a namespace to route MPLS traffic, you could consider adding
> > another macro into system-common-macros.at.
> 
> Ok, possibly there is if some of the configuration is parametrised:
> e.g. over the namespace/netdev to send/receive MPLS using native Linux MPLS
> routing.
> 
> > I also see this error on "http over mpls over gre tunnel":
> > +sh: 1: cannot create /proc/sys/net/mpls/conf/ns_gre0/input: Directory
> > nonexistent
> > 
> > Maybe MPLS + GRE needs a separate check?
> 
> Yes, that is probably the case.
> 
> I believe some versions of the kernel support MPLS routing for
> some interfaces but not GRE interfaces.

Please find my working patch below.

From: Simon Horman <horms@...ge.net.au>
Subject: [PATCH] system-traffic: Exercise GSO

Exercise GSO for: unencapsulated; MPLS; GRE; and MPLS in GRE.

There is scope to extend this testing to other encapsulation formats
if desired.

This is motivated by a desire to test GRE and MPLS encapsulation in
the context of L3/VPN (MPLS over non-TEB GRE work). That is not
tested here but tests for those cases would idealy be based on those in
this patch.

Signed-off-by: Simon Horman <horms@...ge.net.au>
---
v2
* As suggested by Joe Stringer
  -  Do not add spurious ns1 / http commands to "datapath - ping over gre tunnel"
  - Add OVS_CHECK_MPLS_GRE
  - Use AT_SKIP_IF
  - Use AT_DATA
  - Check for zero delta of retransmits rather than absoloute zero
  - Consolidate MPLS configuration into NS_ADD_MPLS_ROUTE macro
  - Move macros from system-kmod-macros.at to system-common-marcos.at
    to allow tests to work for make check-system-userspace to work
    as well as make check-kernel
---
 tests/system-common-macros.at |  94 +++++++++++++++++++--
 tests/system-traffic.at       | 191 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 276 insertions(+), 9 deletions(-)

diff --git a/tests/system-common-macros.at b/tests/system-common-macros.at
index 4ffc382..41040a8 100644
--- a/tests/system-common-macros.at
+++ b/tests/system-common-macros.at
@@ -56,7 +56,7 @@ m4_define([ADD_INT],
     ]
 )
 
-# ADD_VETH([port], [namespace], [ovs-br], [ip_addr] [mac_addr [gateway]])
+# ADD_VETH([port], [namespace], [ovs-br], [ip_addr] [mac_addr [gateway [ofport]]])
 #
 # Add a pair of veth ports. 'port' will be added to name space 'namespace',
 # and "ovs-'port'" will be added to ovs bridge 'ovs-br'.
@@ -64,8 +64,8 @@ m4_define([ADD_INT],
 # The 'port' in 'namespace' will be brought up with static IP address
 # with 'ip_addr' in CIDR notation.
 #
-# Optionally, one can specify the 'mac_addr' for 'port' and the default
-# 'gateway'.
+# Optionally, one can specify the 'mac_addr' for 'port', the default
+# 'gateway' and the 'ofport' number.
 #
 # The existing 'port' or 'ovs-port' will be removed before new ones are added.
 #
@@ -74,8 +74,14 @@ m4_define([ADD_VETH],
       CONFIGURE_VETH_OFFLOADS([$1])
       AT_CHECK([ip link set $1 netns $2])
       AT_CHECK([ip link set dev ovs-$1 up])
-      AT_CHECK([ovs-vsctl add-port $3 ovs-$1 -- \
-                set interface ovs-$1 external-ids:iface-id="$1"])
+      if test -n "$7"; then
+        AT_CHECK([ovs-vsctl add-port $3 ovs-$1 -- \
+                  set interface ovs-$1 external-ids:iface-id="$1" \
+                  ofport_request=$7])
+      else
+        AT_CHECK([ovs-vsctl add-port $3 ovs-$1 -- \
+                  set interface ovs-$1 external-ids:iface-id="$1"])
+      fi
       NS_CHECK_EXEC([$2], [ip addr add $4 dev $1])
       NS_CHECK_EXEC([$2], [ip link set dev $1 up])
       if test -n "$5"; then
@@ -99,7 +105,7 @@ m4_define([ADD_VLAN],
     ]
 )
 
-# ADD_OVS_TUNNEL([type], [bridge], [port], [remote-addr], [overlay-addr])
+# ADD_OVS_TUNNEL([type], [bridge], [port], [remote-addr], [overlay-addr [ofport]])
 #
 # Add an ovs-based tunnel device in the root namespace, with name 'port' and
 # type 'type'. The tunnel device will be configured as point-to-point with the
@@ -107,9 +113,17 @@ m4_define([ADD_VLAN],
 #
 # 'port will be configured with the address 'overlay-addr'.
 #
+# Optionally one can specify the 'ofport' number
+#
 m4_define([ADD_OVS_TUNNEL],
-   [AT_CHECK([ovs-vsctl add-port $2 $3 -- \
-              set int $3 type=$1 options:remote_ip=$4])
+   [if test -n "$6"; then
+      AT_CHECK([ovs-vsctl add-port $2 $3 -- \
+                set int $3 type=$1 options:remote_ip=$4 \
+		ofport_request=$6])
+    else
+      AT_CHECK([ovs-vsctl add-port $2 $3 -- \
+                set int $3 type=$1 options:remote_ip=$4])
+    fi
     AT_CHECK([ip addr add dev $2 $5])
     AT_CHECK([ip link set dev $2 up])
     AT_CHECK([ip link set dev $2 mtu 1450])
@@ -143,6 +157,12 @@ m4_define([ADD_NATIVE_TUNNEL],
 #
 m4_define([FORMAT_PING], [grep "transmitted" | sed 's/time.*ms$/time 0ms/'])
 
+# FORMAT_DD([])
+#
+# Strip variant pieces from dd output so the output can be reliably compared.
+#
+m4_define([FORMAT_DD], [sed 's/copied,.*$/copied, .../'])
+
 # FORMAT_CT([ip-addr])
 #
 # Strip content from the piped input which would differ from test to test
@@ -168,10 +188,68 @@ m4_define([NETNS_DAEMONIZE],
 m4_define([OVS_CHECK_VXLAN],
     [AT_SKIP_IF([! ip link add foo type vxlan help 2>&1 | grep dstport >/dev/null])])
 
+# OVS_CHECK_MPLS()
+#
+# Perform requirements checks for running MPLS tests.
+#
+m4_define([OVS_CHECK_MPLS],
+    [m4_foreach([mod], [[mpls_router]],
+                [modprobe mod || echo "Module mod not loaded."
+                 on_exit 'modprobe -r mod'
+                ])
+     dnl Requires Linux v4.7+ and ip route v4.7+
+     dnl  Prepare
+     AT_SKIP_IF([! echo 101 > /proc/sys/net/mpls/platform_labels])
+     [ip -f mpls route del 100]
+     dnl  Test
+     AT_SKIP_IF([! ip -f mpls route add 100 dev lo])
+     dnl  Cleanup
+     AT_SKIP_IF([! ip -f mpls route del 100])
+     AT_SKIP_IF([! echo 0 > /proc/sys/net/mpls/platform_labels])
+    ]
+)
+
 # OVS_CHECK_GRE()
 m4_define([OVS_CHECK_GRE],
     [AT_SKIP_IF([! ip link add foo type gretap help 2>&1 | grep gre >/dev/null])])
 
+# OVS_CHECK_MPLS_GRE()
+#
+# Perform requirements checks for running MPLS over GRE tests.
+#
+m4_define([OVS_CHECK_MPLS_GRE],
+    [OVS_CHECK_MPLS()
+     OVS_CHECK_GRE()
+     m4_foreach([mod], [[ip_gre]],
+                [modprobe mod || echo "Module mod not loaded."
+                 on_exit 'modprobe -r mod'
+                ])
+     dnl Requires Linux v4.8
+     AT_SKIP_IF([! test -e /proc/sys/net/mpls/conf/gretap0/input])
+    ]
+)
+
 # OVS_CHECK_GENEVE()
 m4_define([OVS_CHECK_GENEVE],
     [AT_SKIP_IF([! ip link add foo type geneve help 2>&1 | grep geneve >/dev/null])])
+
+# NS_ADD_MPLS_ROUTE([ns], [port], [prefix], [gateway])
+#
+# Route IP packets to prefix via gateway on port using MPLS label 100 and
+# recieve MPLS packets with label 101 on port locally as IP packets
+m4_define([NS_ADD_MPLS_ROUTE],
+    [dnl Allow MPLS forwarding of packets received on $1
+     NS_CHECK_EXEC([$1], [echo 1 > /proc/sys/net/mpls/conf/$2/input])
+
+     dnl Larger than MPLS label to be routed (101)
+     NS_CHECK_EXEC([$1], [echo 102 > /proc/sys/net/mpls/platform_labels])
+
+     dnl Set up route to encapsulate packets to $2 in MPLS
+     NS_CHECK_EXEC([$1], [ip route add $3 encap mpls 100 via inet $4 dev $2])
+
+     dnl Set up route to decapsulate MPLS label 101 and deliver locally
+     NS_CHECK_EXEC([$1], [ip -f mpls route add 101 dev lo])
+
+     dnl Set loopback interface up for local delivery
+     NS_CHECK_EXEC([$1], [ip link set up dev lo])
+    ])
diff --git a/tests/system-traffic.at b/tests/system-traffic.at
index 2f42efa..3f9db51 100644
--- a/tests/system-traffic.at
+++ b/tests/system-traffic.at
@@ -33,12 +33,27 @@ ADD_NAMESPACES(at_ns0, at_ns1)
 ADD_VETH(p0, at_ns0, br0, "10.1.1.1/24")
 ADD_VETH(p1, at_ns1, br0, "10.1.1.2/24")
 
+dnl Disable TSO as to exercise software segmentation
+dnl when outputting GSO skbs over GRE from OvS
+AT_CHECK([ethtool -K ovs-p0 tso off])
+
 NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.1.2 | FORMAT_PING], [0], [dnl
 3 packets transmitted, 3 received, 0% packet loss, time 0ms
 ])
 
+AT_CHECK([yes | dd bs=1k count=32 of=32k.txt], [0], [], stderr)
+AT_CHECK([cat stderr | FORMAT_DD], [0], [dnl
+32+0 records in
+32+0 records out
+32768 bytes (33 kB) copied, ...
+])
 NETNS_DAEMONIZE([at_ns1], [[$PYTHON $srcdir/test-l7.py]], [http0.pid])
-NS_CHECK_EXEC([at_ns0], [wget 10.1.1.2 -t 3 -T 1 --retry-connrefused -v -o wget0.log])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_before])
+NS_CHECK_EXEC([at_ns0], [wget 10.1.1.2/32k.txt -t 3 -T 1 --retry-connrefused -v -o wget0.log])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_after])
+
+dnl Use the absence of retransmitted segments as a proxy for functioning TSO
+AT_CHECK([diff -u retransmit_before retransmit_after], [0])
 
 OVS_TRAFFIC_VSWITCHD_STOP
 AT_CLEANUP
@@ -69,6 +84,58 @@ NS_CHECK_EXEC([at_ns0], [ping -s 3200 -q -c 3 -i 0.3 -w 2 10.2.2.2 | FORMAT_PING
 OVS_TRAFFIC_VSWITCHD_STOP
 AT_CLEANUP
 
+AT_SETUP([datapath - http over mpls between two ports])
+OVS_CHECK_MPLS()
+OVS_TRAFFIC_VSWITCHD_START()
+
+ADD_NAMESPACES(at_ns0, at_ns1)
+
+dnl Set up underlay
+ADD_VETH(p0, at_ns0, br0, "172.31.1.1/24", [], [], 2)
+ADD_VETH(p1, at_ns1, br0, "172.31.1.2/24", [], [], 3)
+
+dnl Set up MPLS overlay
+dnl IP is encapsulated in MPLS when sent from and recieved from ns0
+dnl OvS, sitting between ns0 and ns1 pushes MPLS onto IP recieved from ns1
+dnl befor sending to ns0, and pops MPLS recieved from ns0 and sends the
+dnl resulting IP packets to ns1
+NS_CHECK_EXEC([at_ns1], [ip addr add 10.1.1.2/24 dev p1])
+
+AT_DATA([flows.txt], [dnl
+in_port=3,ip,nw_src=10.1.1.2,actions=push_mpls:0x8847,set_field:101->mpls_label,output:2
+in_port=2,dl_type=0x8847,mpls_label=100,actions=pop_mpls:0x0800,output:3
+actions=normal
+])
+AT_CHECK([ovs-ofctl add-flows br0 flows.txt])
+
+NS_ADD_MPLS_ROUTE([at_ns0], [p0], [10.1.1.0/24], [172.31.1.2])
+
+dnl Allow for overhead of MPLS LSE
+NS_CHECK_EXEC([at_ns1], [ip link set mtu 1496 dev p1])
+
+dnl Test ping
+NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.1.2 | FORMAT_PING], [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+dnl Test http
+AT_CHECK([yes | dd bs=1k count=32 of=32k.txt], [0], [], stderr)
+AT_CHECK([cat stderr | FORMAT_DD], [0], [dnl
+32+0 records in
+32+0 records out
+32768 bytes (33 kB) copied, ...
+])
+NETNS_DAEMONIZE([at_ns1], [[$PYTHON $srcdir/test-l7.py]], [http0.pid])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_before])
+NS_CHECK_EXEC([at_ns0], [wget 10.1.1.2/32k.txt -t 3 -T 1 --retry-connrefused -v -o wget0.log])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_after])
+
+dnl Use the absence of retransmitted segments as a proxy for functioning GSO
+AT_CHECK([diff -u retransmit_before retransmit_after], [0])
+
+OVS_TRAFFIC_VSWITCHD_STOP
+AT_CLEANUP
+
 AT_SETUP([datapath - ping6 between two ports])
 OVS_TRAFFIC_VSWITCHD_START()
 
@@ -209,6 +276,128 @@ NS_CHECK_EXEC([at_ns0], [ping -s 3200 -q -c 3 -i 0.3 -w 2 10.1.1.100 | FORMAT_PI
 OVS_TRAFFIC_VSWITCHD_STOP
 AT_CLEANUP
 
+AT_SETUP([datapath - http over gre tunnel])
+OVS_CHECK_GRE()
+
+OVS_TRAFFIC_VSWITCHD_START()
+ADD_BR([br-underlay])
+
+AT_CHECK([ovs-ofctl add-flow br0 "actions=normal"])
+AT_CHECK([ovs-ofctl add-flow br-underlay "actions=normal"])
+
+ADD_NAMESPACES(at_ns0, at_ns1)
+
+dnl Set up underlay link from host into the at_ns0 namespace using veth pair.
+ADD_VETH(p0, at_ns0, br-underlay, "172.31.1.1/24")
+AT_CHECK([ip addr add dev br-underlay "172.31.1.100/24"])
+AT_CHECK([ip link set dev br-underlay up])
+
+dnl Set up tunnel endpoints on OVS outside the at_ns0 namespace and
+dnl with a native linux device inside the namespace.
+ADD_OVS_TUNNEL([gre], [br0], [at_gre0], [172.31.1.1], [10.1.1.100/24])
+ADD_NATIVE_TUNNEL([gretap], [ns_gre0], [at_ns0], [172.31.1.100], [10.1.1.1/24])
+
+dnl Add veth pair connected to to br0 and at_ns1 namespace
+ADD_VETH(p1, at_ns1, br0, "10.1.1.2/24")
+
+dnl Disable TSO as to exercise software segmentation
+dnl when outputting GSO skbs over GRE from OvS
+AT_CHECK([ethtool -K ovs-p0 tso off])
+
+dnl First check the underlay
+NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 172.31.1.100 | FORMAT_PING], [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+dnl Next check the overlay
+NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.1.2  | FORMAT_PING], [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+dnl Now check HTTP transfer
+AT_CHECK([yes | dd bs=1k count=32 of=32k.txt], [0], [], stderr)
+AT_CHECK([cat stderr | FORMAT_DD], [0], [dnl
+32+0 records in
+32+0 records out
+32768 bytes (33 kB) copied, ...
+])
+NETNS_DAEMONIZE([at_ns1], [[$PYTHON $srcdir/test-l7.py]], [http0.pid])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_before])
+NS_CHECK_EXEC([at_ns0], [wget 10.1.1.2/32k.txt -t 3 -T 1 --retry-connrefused -v -o wget0.log])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_after])
+
+dnl Use the absence of retransmitted segments as a proxy for functioning TSO
+AT_CHECK([diff -u retransmit_before retransmit_after], [0])
+
+OVS_TRAFFIC_VSWITCHD_STOP
+AT_CLEANUP
+
+AT_SETUP([datapath - http over mpls over gre tunnel])
+OVS_CHECK_MPLS_GRE()
+
+OVS_TRAFFIC_VSWITCHD_START()
+ADD_BR([br-underlay])
+
+ADD_NAMESPACES(at_ns0, at_ns1)
+
+dnl Set up underlay link from host into the at_ns0 namespace using veth pair.
+ADD_VETH(p0, at_ns0, br-underlay, "172.31.1.1/24")
+AT_CHECK([ip addr add dev br-underlay "172.31.1.100/24"])
+AT_CHECK([ip link set dev br-underlay up])
+
+dnl Set up tunnel endpoints on OVS outside the at_ns0 namespace and
+dnl with a native linux device inside the namespace.
+ADD_OVS_TUNNEL([gre], [br0], [at_gre0], [172.31.1.1], [10.1.1.100/24], 2)
+ADD_NATIVE_TUNNEL([gretap], [ns_gre0], [at_ns0], [172.31.1.100], [10.1.1.1/24])
+
+dnl Add veth pair connected to to br0 and at_ns1 namespace
+ADD_VETH(p1, at_ns1, br0, "10.1.1.2/24", [], [], 3)
+
+dnl Set up MPLS overlay
+dnl IP is encapsulated in MPLS when sent from and recieved from ns0
+dnl OvS, sitting between ns0 and ns1 pushes MPLS onto IP recieved from ns1
+dnl befor sending to ns0, and pops MPLS recieved from ns0 and sends the
+dnl resulting IP packets to ns1
+NS_CHECK_EXEC([at_ns1], [ip addr add 10.1.2.2/24 dev p1])
+
+AT_DATA([flows.txt], [dnl
+in_port=3,ip,nw_src=10.1.2.2,actions=push_mpls:0x8847,set_field:101->mpls_label,output:2
+in_port=2,dl_type=0x8847,mpls_label=100,actions=pop_mpls:0x0800,output:3
+actions=normal
+])
+AT_CHECK([ovs-ofctl add-flows br0 flows.txt])
+AT_CHECK([ovs-ofctl add-flow br-underlay "actions=normal"])
+
+NS_ADD_MPLS_ROUTE([at_ns0], [ns_gre0], [10.1.2.0/24], [10.1.1.2])
+
+dnl First check the underlay
+NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 172.31.1.100 | FORMAT_PING], [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+dnl Next check the overlay
+NS_CHECK_EXEC([at_ns0], [ping -q -c 3 -i 0.3 -w 2 10.1.2.2  | FORMAT_PING], [0], [dnl
+3 packets transmitted, 3 received, 0% packet loss, time 0ms
+])
+
+dnl Now check HTTP transfer
+AT_CHECK([yes | dd bs=1k count=32 of=32k.txt], [0], [], stderr)
+AT_CHECK([cat stderr | FORMAT_DD], [0], [dnl
+32+0 records in
+32+0 records out
+32768 bytes (33 kB) copied, ...
+])
+NETNS_DAEMONIZE([at_ns1], [[$PYTHON $srcdir/test-l7.py]], [http0.pid])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_before])
+NS_CHECK_EXEC([at_ns0], [wget 10.1.2.2/32k.txt -t 3 -T 1 --retry-connrefused -v -o wget0.log])
+NS_CHECK_EXEC([at_ns1], [netstat -s | grep retransmited > retransmit_after])
+
+dnl Use the absence of retransmitted segments as a proxy for functioning GSO
+AT_CHECK([diff -u retransmit_before retransmit_after], [0])
+
+OVS_TRAFFIC_VSWITCHD_STOP
+AT_CLEANUP
+
 AT_SETUP([datapath - ping over geneve tunnel])
 OVS_CHECK_GENEVE()
 
-- 
2.1.4

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