Author: rrs
Date: Tue Jun 12 13:31:32 2012
New Revision: 236957
URL: http://svn.freebsd.org/changeset/base/236957

Log:
  Fix comment to better reflect how we are
  cheating and using the csum_data. Also fix
  style issues with the comments.

Modified:
  head/sys/net/if_gif.c

Modified: head/sys/net/if_gif.c
==============================================================================
--- head/sys/net/if_gif.c       Tue Jun 12 13:15:27 2012        (r236956)
+++ head/sys/net/if_gif.c       Tue Jun 12 13:31:32 2012        (r236957)
@@ -385,8 +385,9 @@ keep_going:
                    m->m_pkthdr.len -= GIF_HDR_LEN6;
 #endif
 #endif
-               /* Now pull back the af in packet that
-                * was saved in the address location.
+               /* 
+                * Now pull back the af that we
+                * stashed in the csum_data.
                 */
                af = m->m_pkthdr.csum_data;
                
@@ -504,9 +505,12 @@ gif_output(ifp, m, dst, ro)
                dst->sa_family = af;
        }
        af = dst->sa_family;
-       /* Now save the af in the inbound pkt csum
-        * data, this is a cheat since really
-        * gif tunnels don't do offload.
+       /* 
+        * Now save the af in the inbound pkt csum
+        * data, this is a cheat since we are using
+        * the inbound csum_data field to carry the
+        * af over to the gif_start() routine, avoiding
+        * using yet another mtag. 
         */
        m->m_pkthdr.csum_data = af;
        if (!(ifp->if_flags & IFF_UP) ||
@@ -516,7 +520,8 @@ gif_output(ifp, m, dst, ro)
                goto end;
        }
 #ifdef ALTQ
-       /* Make altq aware of the bytes we will add 
+       /*
+        * Make altq aware of the bytes we will add 
         * when we actually send it.
         */
 #ifdef INET
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