[src/trunk]: src/tests/net/in_cksum add code to dump the mbuf contents

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/5fee9e6ac2ce
branches:  trunk
changeset: 341114:5fee9e6ac2ce
user:      christos <christos%NetBSD.org@localhost>
date:      Sun Oct 18 18:26:55 2015 +0000

description:
add code to dump the mbuf contents

diffstat:

 tests/net/in_cksum/in_cksum.c |  53 +++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 51 insertions(+), 2 deletions(-)

diffs (81 lines):

diff -r 83f665073530 -r 5fee9e6ac2ce tests/net/in_cksum/in_cksum.c
--- a/tests/net/in_cksum/in_cksum.c     Sun Oct 18 17:13:32 2015 +0000
+++ b/tests/net/in_cksum/in_cksum.c     Sun Oct 18 18:26:55 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: in_cksum.c,v 1.3 2015/01/06 21:36:38 joerg Exp $       */
+/*     $NetBSD: in_cksum.c,v 1.4 2015/10/18 18:26:55 christos Exp $    */
 /*-
  * Copyright (c) 2008 Joerg Sonnenberger <joerg%NetBSD.org@localhost>.
  * All rights reserved.
@@ -29,7 +29,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: in_cksum.c,v 1.3 2015/01/06 21:36:38 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: in_cksum.c,v 1.4 2015/10/18 18:26:55 christos Exp $");
 
 #include <sys/param.h>
 #include <sys/mbuf.h>
@@ -99,6 +99,49 @@
        return m;
 }
 
+#ifdef MBUFDUMP
+static void
+dump_mbuf(const struct mbuf *m, int len, int off)
+{
+       int x = 0;
+       if (len <= 0)
+               return;
+
+       printf("Starting len=%d off=%d:\n", len, off);
+       if (off > 0) {
+               for (; m; m = m->m_next)
+                       if (off > m->m_len)
+                               off -= m->m_len;
+                       else
+                               break;
+               if (m == NULL || off > m->m_len)
+                       errx(1, "out of data");
+       }
+
+       unsigned char *ptr = mtod(m, unsigned char *) + off;
+       unsigned char *eptr = ptr + m->m_len;
+       printf("[");
+       for (;;) {
+               if (ptr == eptr) {
+                       m = m->m_next;
+                       if (m == NULL)
+                               errx(1, "out of data");
+                       ptr = mtod(m, unsigned char *);
+                       eptr = ptr + m->m_len;
+                       printf("]\n[");
+                       x = 0;
+               }
+               printf("%.2x ", *ptr++);
+               if (++x % 16 == 0)
+                       printf("\n");
+               if (--len == 0)
+                       break;
+       }
+       printf("]\n");
+       fflush(stdout);
+}
+#endif
+
 static void
 randomise_mbuf_chain(struct mbuf *m)
 {
@@ -181,6 +224,12 @@
                len -= off;
                old_sum = portable_cpu_in_cksum(m, len, off, init_sum);
 #ifdef HAVE_CPU_IN_CKSUM
+               if (len == 10041)
+                       m = m->m_next;
+#ifdef MBUFDUMP
+               printf("m->m_len=%d len=%d off=%d\n", m->m_len, len, off);
+               dump_mbuf(m, len, off);
+#endif
                new_sum = cpu_in_cksum(m, len, off, init_sum);
                if (old_sum != new_sum)
                        errx(1, "comparison failed: %x %x", old_sum, new_sum);