vppinfra: new vectorized ip checksum functions incl. csum_and_copy

Type: improvement
Change-Id: Id5810b7f4a6d6e4ce16b73c235b50db5d475ebf7
Signed-off-by: Damjan Marion <damarion@cisco.com>

1 files changed, 120 insertions, 0 deletions

diff --git a/src/vppinfra/vector/test/ip_csum.c b/src/vppinfra/vector/test/ip_csum.c
new file mode 100644
index 00000000000..135d5ae63b2
--- /dev/null
+++ b/src/vppinfra/vector/test/ip_csum.c
@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: Apache-2.0
+ * Copyright(c) 2021 Cisco Systems, Inc.
+ */
+
+#include <vppinfra/format.h>
+#include <vppinfra/vector/test/test.h>
+#include <vppinfra/vector/ip_csum.h>
+
+typedef struct
+{
+  struct
+  {
+    u8 *src;
+    u32 count;
+  } chunk[5];
+  u16 result;
+} ip_csum_test_t;
+
+static u8 test1[] = { 0x45, 0x00, 0x00, 0x73, 0x00, 0x00, 0x40,
+		      0x00, 0x40, 0x11, 0x00, 0x00, 0xc0, 0xa8,
+		      0x00, 0x01, 0xc0, 0xa8, 0x00, 0xc7, 0x00 };
+#define TEST_LEN(x) (ARRAY_LEN (x) - 1)
+
+static ip_csum_test_t tests[] = { {
+				    .chunk[0].src = test1,
+				    .chunk[0].count = TEST_LEN (test1),
+				    .result = 0x61b8,
+				  },
+				  {
+				    .chunk[0].src = test1,
+				    .chunk[0].count = 1,
+				    .chunk[1].src = test1 + 1,
+				    .chunk[1].count = 2,
+				    .chunk[2].src = test1 + 3,
+				    .chunk[2].count = 3,
+				    .chunk[3].src = test1 + 6,
+				    .chunk[3].count = 4,
+				    .chunk[4].src = test1 + 10,
+				    .chunk[4].count = TEST_LEN (test1) - 10,
+				    .result = 0x61b8,
+				  },
+				  {
+				    .chunk[0].count = 1,
+				    .result = 0xff0f,
+				  },
+				  {
+				    .chunk[0].count = 2,
+				    .result = 0x080f,
+				  },
+				  {
+				    .chunk[0].count = 3,
+				    .result = 0x0711,
+				  },
+				  {
+				    .chunk[0].count = 4,
+				    .result = 0x1210,
+				  },
+				  {
+				    .chunk[0].count = 63,
+				    .result = 0xda01,
+				  },
+				  {
+				    .chunk[0].count = 64,
+				    .result = 0xe100,
+				  },
+				  {
+				    .chunk[0].count = 65,
+				    .result = 0xe010,
+				  },
+				  {
+				    .chunk[0].count = 65535,
+				    .result = 0xfc84,
+				  },
+				  {
+				    .chunk[0].count = 65536,
+				    .result = 0xffff,
+				  } };
+
+static clib_error_t *
+test_clib_ip_csum (clib_error_t *err)
+{
+  u8 *buf;
+  buf = clib_mem_alloc_aligned (65536, CLIB_CACHE_LINE_BYTES);
+  for (int i = 0; i < 65536; i++)
+    buf[i] = 0xf0 + ((i * 7) & 0xf);
+
+  for (int i = 0; i < ARRAY_LEN (tests); i++)
+    {
+      clib_ip_csum_t c = {};
+      ip_csum_test_t *t = tests + i;
+      u16 rv;
+
+      for (int j = 0; j < ARRAY_LEN (((ip_csum_test_t *) 0)->chunk); j++)
+	if (t->chunk[j].count > 0)
+	  {
+	    if (t->chunk[j].src == 0)
+	      clib_ip_csum_chunk (&c, buf, t->chunk[j].count);
+	    else
+	      clib_ip_csum_chunk (&c, t->chunk[j].src, t->chunk[j].count);
+	  }
+      rv = clib_ip_csum_fold (&c);
+
+      if (rv != tests[i].result)
+	{
+	  err = clib_error_return (err,
+				   "bad checksum in test case %u (expected "
+				   "0x%04x, calculated 0x%04x)",
+				   i, tests[i].result, rv);
+	  goto done;
+	}
+    }
+done:
+  clib_mem_free (buf);
+  return err;
+}
+
+REGISTER_TEST (clib_ip_csum) = {
+  .name = "clib_ip_csum",
+  .fn = test_clib_ip_csum,
+};