mbuf.9 patch

Index: mbuf.9
===================================================================
--- mbuf.9	(revision 260701)
+++ mbuf.9	(working copy)
@@ -72,8 +72,10 @@
 .Ft struct mbuf *
 .Fn m_get "int how" "int type"
 .Ft struct mbuf *
-.Fn m_getm "struct mbuf *orig" "int len" "int how" "int type"
+.Fn m_getm "struct mbuf *orig" "int len" "int how" "short type"
 .Ft struct mbuf *
+.Fn m_getm2 "struct mbuf *m" "int len" "int how" "short type" "int flags"
+.Ft struct mbuf *
 .Fn m_getcl "int how" "short type" "int flags"
 .Ft struct mbuf *
 .Fn m_getclr "int how" "int type"
@@ -136,6 +138,8 @@
 .Ft struct mbuf *
 .Fn m_defrag "struct mbuf *m0" "int how"
 .Ft struct mbuf *
+.Fn m_collapse "struct mbuf *m0" "int how" "int maxfrags"
+.Ft struct mbuf *
 .Fn m_unshare "struct mbuf *m0" "int how"
 .\"
 .Sh DESCRIPTION
@@ -574,6 +578,14 @@
 and
 .Vt mbuf cluster
 allocation.
+.It Fn m_getm2 m len how type flags
+A version of
+.Fn m_getm
+that allows specific
+.Fa flags
+to be set, e.g. when
+.Vt M_PKTHDR
+is not desired.
 .It Fn m_gethdr how type
 A function version of
 .Fn MGETHDR
@@ -973,8 +985,19 @@
 depending on the caller's preference.
 .Pp
 This function is especially useful in network drivers, where
-certain long mbuf chains must be shortened before being added
-to TX descriptor lists.
+certain long
+.Vt mbuf chains
+must be shortened before being added to TX descriptor lists.
+.It Fn m_collapse m0 how maxfrags
+Collapse an mbuf chain, returning at most
+.Fa maxfrags
+separate
+.Vt mbufs+clusters .
+If this is not possible
+.Dv NULL
+is returned and the original
+.Vt mbuf chain
+is left in its present (potentially modified) state.
 .It Fn m_unshare m0 how
 Create a version of the specified mbuf chain whose
 contents can be safely modified without affecting other users.