Module Name: src
Committed By: maxv
Date: Sun Apr 15 17:26:39 UTC 2018
Modified Files:
src/sys/sys: mbuf.h
Log Message:
clarify
To generate a diff of this commit:
cvs rdiff -u -r1.186 -r1.187 src/sys/sys/mbuf.h
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/sys/mbuf.h
diff -u src/sys/sys/mbuf.h:1.186 src/sys/sys/mbuf.h:1.187
--- src/sys/sys/mbuf.h:1.186 Sun Apr 15 07:35:49 2018
+++ src/sys/sys/mbuf.h Sun Apr 15 17:26:39 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: mbuf.h,v 1.186 2018/04/15 07:35:49 maxv Exp $ */
+/* $NetBSD: mbuf.h,v 1.187 2018/04/15 17:26:39 maxv Exp $ */
/*
* Copyright (c) 1996, 1997, 1999, 2001, 2007 The NetBSD Foundation, Inc.
@@ -254,7 +254,9 @@ struct pkthdr {
#define M_EXT_MAXPAGES ((65536 / MIN_PAGE_SIZE) + 1)
#endif
-/* description of external storage mapped into mbuf, valid if M_EXT set */
+/*
+ * Description of external storage mapped into mbuf, valid if M_EXT set.
+ */
struct _m_ext_storage {
unsigned int ext_refcnt;
int ext_flags;
@@ -263,19 +265,18 @@ struct _m_ext_storage {
(struct mbuf *, void *, size_t, void *);
void *ext_arg; /* argument for ext_free */
size_t ext_size; /* size of buffer, for ext_free */
+
union {
- paddr_t extun_paddr; /* physical address (M_EXT_CLUSTER) */
- /* pages (M_EXT_PAGES) */
- /*
- * XXX This is gross, but it doesn't really matter; this is
- * XXX overlaid on top of the mbuf data area.
- */
+ /* M_EXT_CLUSTER: physical address */
+ paddr_t extun_paddr;
#ifdef M_EXT_MAXPAGES
+ /* M_EXT_PAGES: pages */
struct vm_page *extun_pgs[M_EXT_MAXPAGES];
#endif
} ext_un;
#define ext_paddr ext_un.extun_paddr
#define ext_pgs ext_un.extun_pgs
+
#ifdef DEBUG
const char *ext_ofile;
const char *ext_nfile;
@@ -297,12 +298,12 @@ struct _m_ext {
*/
#define MBUF_DEFINE(name, mhlen, mlen) \
struct name { \
- struct m_hdr m_hdr; \
+ struct m_hdr m_hdr; \
union { \
struct { \
- struct pkthdr MH_pkthdr; \
+ struct pkthdr MH_pkthdr; \
union { \
- struct _m_ext MH_ext; \
+ struct _m_ext MH_ext; \
char MH_databuf[(mhlen)]; \
} MH_dat; \
} MH; \
