No vector allocation during buffer copy

Change-Id: I7e8556af833ca0e00fadc96dcd2077ff1104541b
Signed-off-by: Neale Ranns <nranns@cisco.com>

src/vlib/buffer_funcs.h

@@ -476,7 +476,6 @@ vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
 {
   vlib_buffer_t *s, *d, *fd;
   uword n_alloc, n_buffers = 1;
-  u32 *new_buffers = 0;
   u32 flag_mask = VLIB_BUFFER_NEXT_PRESENT | VLIB_BUFFER_TOTAL_LENGTH_VALID;
   int i;
 
@@ -486,8 +485,8 @@ vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
       n_buffers++;
       s = vlib_get_buffer (vm, s->next_buffer);
     }
+  u32 new_buffers[n_buffers];
 
-  vec_validate (new_buffers, n_buffers - 1);
   n_alloc = vlib_buffer_alloc (vm, new_buffers, n_buffers);
 
   /* No guarantee that we'll get all the buffers we asked for */
@@ -495,7 +494,6 @@ vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
     {
       if (n_alloc > 0)
 	vlib_buffer_free (vm, new_buffers, n_alloc);
-      vec_free (new_buffers);
       return 0;
     }
 
@@ -526,7 +524,6 @@ vlib_buffer_copy (vlib_main_t * vm, vlib_buffer_t * b)
       d->flags = s->flags & flag_mask;
     }
 
-  vec_free (new_buffers);
   return fd;
 }
 

src/vnet/fib/mpls_fib.h

@@ -28,9 +28,7 @@
 static inline mpls_fib_t*
 mpls_fib_get (fib_node_index_t index)
 {
-    if (!pool_is_free_index(mpls_main.fibs, index))
-	return (&(pool_elt_at_index(mpls_main.fibs, index)->mpls));
-    return (NULL);
+    return (&(pool_elt_at_index(mpls_main.fibs, index)->mpls));
 }
 
 extern u32 mpls_fib_table_find_or_create_and_lock(u32 table_id);

test/test_ip_mcast.py

@@ -8,7 +8,7 @@ from vpp_ip_route import VppIpMRoute, VppMRoutePath, VppMFibSignal
 
 from scapy.packet import Raw
 from scapy.layers.l2 import Ether
-from scapy.layers.inet import IP, UDP, getmacbyip
+from scapy.layers.inet import IP, UDP, getmacbyip, ICMP
 from scapy.layers.inet6 import IPv6, getmacbyip6
 from util import ppp
 
@@ -70,16 +70,17 @@ class TestIPMcast(VppTestCase):
             i.resolve_arp()
             i.resolve_ndp()
 
-    def create_stream_ip4(self, src_if, src_ip, dst_ip):
+    def create_stream_ip4(self, src_if, src_ip, dst_ip, payload_size=0):
         pkts = []
+        # default to small packet sizes
+        p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
+             IP(src=src_ip, dst=dst_ip) /
+             UDP(sport=1234, dport=1234))
+        if not payload_size:
+            payload_size = 64 - len(p)
+            p = p / Raw('\xa5' * payload_size)
+
         for i in range(0, N_PKTS_IN_STREAM):
-            info = self.create_packet_info(src_if, src_if)
-            payload = self.info_to_payload(info)
-            p = (Ether(dst=src_if.local_mac, src=src_if.remote_mac) /
-                 IP(src=src_ip, dst=dst_ip) /
-                 UDP(sport=1234, dport=1234) /
-                 Raw(payload))
-            info.data = p.copy()
             pkts.append(p)
         return pkts
 
@@ -237,6 +238,7 @@ class TestIPMcast(VppTestCase):
 
         #
         # a stream that matches the route for (1.1.1.1,232.1.1.1)
+        #  small packets
         #
         self.vapi.cli("clear trace")
         tx = self.create_stream_ip4(self.pg0, "1.1.1.1", "232.1.1.1")
@@ -254,6 +256,33 @@ class TestIPMcast(VppTestCase):
         self.verify_capture_ip4(self.pg6, tx)
         self.verify_capture_ip4(self.pg7, tx)
 
+        # no replications on Pg0
+        self.pg0.assert_nothing_captured(
+            remark="IP multicast packets forwarded on PG0")
+        self.pg3.assert_nothing_captured(
+            remark="IP multicast packets forwarded on PG3")
+
+        #
+        # a stream that matches the route for (1.1.1.1,232.1.1.1)
+        #  large packets
+        #
+        self.vapi.cli("clear trace")
+        tx = self.create_stream_ip4(self.pg0, "1.1.1.1", "232.1.1.1",
+                                    payload_size=1024)
+        self.pg0.add_stream(tx)
+
+        self.pg_enable_capture(self.pg_interfaces)
+        self.pg_start()
+
+        # We expect replications on Pg1->7
+        self.verify_capture_ip4(self.pg1, tx)
+        self.verify_capture_ip4(self.pg2, tx)
+        self.verify_capture_ip4(self.pg3, tx)
+        self.verify_capture_ip4(self.pg4, tx)
+        self.verify_capture_ip4(self.pg5, tx)
+        self.verify_capture_ip4(self.pg6, tx)
+        self.verify_capture_ip4(self.pg7, tx)
+
         # no replications on Pg0
         self.pg0.assert_nothing_captured(
             remark="IP multicast packets forwarded on PG0")