bond: performance harvesting [VPP-1298]

- hash is great. But it is a bit too slow for the DP. Use direct array indexing
to quickly retrieve the slave interface.
- the algorithm used by flow hash is great. But it is a bit too slow for the DP.
Use l2_hash_hash() extracted from lb_hash.h which ECMP is using. It makes use
of intrinsic crc32 instruction set.
- shortcut modulo arithmetic when the operand is 2**x (where x up to 4) to
avoid division instruction.
- special case for link count == 1 in bond_tx_fn()
- use clib_mem_unaligned to access data for the packet to avoid alignment error
- Fix some typos for packet tracing.

Change-Id: I8eae3ad497061c5473aa675ba894ee0211120d25
Signed-off-by: Steven <sluong@cisco.com>
(cherry picked from commit 0d88301a576191a0e330e539cf1dcb3837ee1bf6)

1 files changed, 3 insertions, 11 deletions

diff --git a/test/test_bond.py b/test/test_bond.py
index b54a1f1deb5..e354601ca91 100644
--- a/test/test_bond.py
+++ b/test/test_bond.py
@@ -136,19 +136,11 @@ class TestBondInterface(VppTestCase):
                 found = 1
         self.assertEqual(found, 1)
 
-        # pg0 tx bytes = 142
-        intfs = self.vapi.cli("show interface pg0").split("\n")
-        found = 0
-        for intf in intfs:
-            if "tx bytes" in intf and "142" in intf:
-                found = 1
-        self.assertEqual(found, 1)
-
-        # pg0 tx bytes = 142
-        intfs = self.vapi.cli("show interface pg1").split("\n")
+        # BondEthernet0 tx bytes = 284
+        intfs = self.vapi.cli("show interface BondEthernet0").split("\n")
         found = 0
         for intf in intfs:
-            if "tx bytes" in intf and "142" in intf:
+            if "tx bytes" in intf and "284" in intf:
                 found = 1
         self.assertEqual(found, 1)