Module Name: src
Committed By: maxv
Date: Thu Dec 27 14:24:11 UTC 2018
Modified Files:
src/sys/sys: mbuf.h
Log Message:
Style, use __nothing, and remove _M_ (unused, appears to be a typo). No
functional change.
To generate a diff of this commit:
cvs rdiff -u -r1.217 -r1.218 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:1.217 src/sys/sys/mbuf.h:1.218
--- src/sys/sys/mbuf.h:1.217 Thu Dec 27 14:03:55 2018
+++ src/sys/sys/mbuf.h Thu Dec 27 14:24:11 2018
@@ -1,4 +1,4 @@
-/* $NetBSD: mbuf.h,v 1.217 2018/12/27 14:03:55 maxv Exp $ */
+/* $NetBSD: mbuf.h,v 1.218 2018/12/27 14:24:11 maxv Exp $ */
/*
* Copyright (c) 1996, 1997, 1999, 2001, 2007 The NetBSD Foundation, Inc.
@@ -144,13 +144,13 @@ struct mowner_user {
* Macros for type conversion
* mtod(m,t) - convert mbuf pointer to data pointer of correct type
*/
-#define mtod(m, t) ((t)((m)->m_data))
+#define mtod(m, t) ((t)((m)->m_data))
/* header at beginning of each mbuf */
struct m_hdr {
struct mbuf *mh_next; /* next buffer in chain */
struct mbuf *mh_nextpkt; /* next chain in queue/record */
- char *mh_data; /* location of data */
+ char *mh_data; /* location of data */
struct mowner *mh_owner; /* mbuf owner */
int mh_len; /* amount of data in this mbuf */
int mh_flags; /* flags; see below */
@@ -205,19 +205,19 @@ struct pkthdr {
};
/* Checksumming flags (csum_flags). */
-#define M_CSUM_TCPv4 0x00000001 /* TCP header/payload */
-#define M_CSUM_UDPv4 0x00000002 /* UDP header/payload */
-#define M_CSUM_TCP_UDP_BAD 0x00000004 /* TCP/UDP checksum bad */
-#define M_CSUM_DATA 0x00000008 /* consult csum_data */
-#define M_CSUM_TCPv6 0x00000010 /* IPv6 TCP header/payload */
-#define M_CSUM_UDPv6 0x00000020 /* IPv6 UDP header/payload */
-#define M_CSUM_IPv4 0x00000040 /* IPv4 header */
-#define M_CSUM_IPv4_BAD 0x00000080 /* IPv4 header checksum bad */
-#define M_CSUM_TSOv4 0x00000100 /* TCPv4 segmentation offload */
-#define M_CSUM_TSOv6 0x00000200 /* TCPv6 segmentation offload */
+#define M_CSUM_TCPv4 0x00000001 /* TCP header/payload */
+#define M_CSUM_UDPv4 0x00000002 /* UDP header/payload */
+#define M_CSUM_TCP_UDP_BAD 0x00000004 /* TCP/UDP checksum bad */
+#define M_CSUM_DATA 0x00000008 /* consult csum_data */
+#define M_CSUM_TCPv6 0x00000010 /* IPv6 TCP header/payload */
+#define M_CSUM_UDPv6 0x00000020 /* IPv6 UDP header/payload */
+#define M_CSUM_IPv4 0x00000040 /* IPv4 header */
+#define M_CSUM_IPv4_BAD 0x00000080 /* IPv4 header checksum bad */
+#define M_CSUM_TSOv4 0x00000100 /* TCPv4 segmentation offload */
+#define M_CSUM_TSOv6 0x00000200 /* TCPv6 segmentation offload */
/* Checksum-assist quirks: keep separate from jump-table bits. */
-#define M_CSUM_NO_PSEUDOHDR 0x80000000 /* Rx csum_data does not include
+#define M_CSUM_NO_PSEUDOHDR 0x80000000 /* Rx csum_data does not include
* the UDP/TCP pseudo-hdr, and
* is not yet 1s-complemented.
*/
@@ -234,18 +234,18 @@ struct pkthdr {
* words the offset of the UDP/TCP header in the packet.
* _OFFSET: Offset of the checksum field in the UDP/TCP header.
*/
-#define M_CSUM_DATA_IPv4_IPHL(x) ((x) >> 16)
-#define M_CSUM_DATA_IPv4_OFFSET(x) ((x) & 0xffff)
-#define M_CSUM_DATA_IPv6_IPHL(x) ((x) >> 16)
-#define M_CSUM_DATA_IPv6_OFFSET(x) ((x) & 0xffff)
-#define M_CSUM_DATA_IPv6_SET(x, v) (x) = ((x) & 0xffff) | ((v) << 16)
+#define M_CSUM_DATA_IPv4_IPHL(x) ((x) >> 16)
+#define M_CSUM_DATA_IPv4_OFFSET(x) ((x) & 0xffff)
+#define M_CSUM_DATA_IPv6_IPHL(x) ((x) >> 16)
+#define M_CSUM_DATA_IPv6_OFFSET(x) ((x) & 0xffff)
+#define M_CSUM_DATA_IPv6_SET(x, v) (x) = ((x) & 0xffff) | ((v) << 16)
/*
* Max # of pages we can attach to m_ext. This is carefully chosen
* to be able to handle SOSEND_LOAN_CHUNK with our minimum sized page.
*/
#ifdef MIN_PAGE_SIZE
-#define M_EXT_MAXPAGES ((65536 / MIN_PAGE_SIZE) + 1)
+#define M_EXT_MAXPAGES ((65536 / MIN_PAGE_SIZE) + 1)
#endif
/*
@@ -267,8 +267,8 @@ struct _m_ext_storage {
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
+#define ext_paddr ext_un.extun_paddr
+#define ext_pgs ext_un.extun_pgs
};
struct _m_ext {
@@ -276,13 +276,13 @@ struct _m_ext {
struct _m_ext_storage ext_storage;
};
-#define M_PADDR_INVALID POOL_PADDR_INVALID
+#define M_PADDR_INVALID POOL_PADDR_INVALID
/*
* Definition of "struct mbuf".
* Don't change this without understanding how MHLEN/MLEN are defined.
*/
-#define MBUF_DEFINE(name, mhlen, mlen) \
+#define MBUF_DEFINE(name, mhlen, mlen) \
struct name { \
struct m_hdr m_hdr; \
union { \
@@ -296,20 +296,20 @@ struct _m_ext {
char M_databuf[(mlen)]; \
} M_dat; \
}
-#define m_next m_hdr.mh_next
-#define m_len m_hdr.mh_len
-#define m_data m_hdr.mh_data
-#define m_owner m_hdr.mh_owner
-#define m_type m_hdr.mh_type
-#define m_flags m_hdr.mh_flags
-#define m_nextpkt m_hdr.mh_nextpkt
-#define m_paddr m_hdr.mh_paddr
-#define m_pkthdr M_dat.MH.MH_pkthdr
-#define m_ext_storage M_dat.MH.MH_dat.MH_ext.ext_storage
-#define m_ext_ref M_dat.MH.MH_dat.MH_ext.ext_ref
-#define m_ext m_ext_ref->m_ext_storage
-#define m_pktdat M_dat.MH.MH_dat.MH_databuf
-#define m_dat M_dat.M_databuf
+#define m_next m_hdr.mh_next
+#define m_len m_hdr.mh_len
+#define m_data m_hdr.mh_data
+#define m_owner m_hdr.mh_owner
+#define m_type m_hdr.mh_type
+#define m_flags m_hdr.mh_flags
+#define m_nextpkt m_hdr.mh_nextpkt
+#define m_paddr m_hdr.mh_paddr
+#define m_pkthdr M_dat.MH.MH_pkthdr
+#define m_ext_storage M_dat.MH.MH_dat.MH_ext.ext_storage
+#define m_ext_ref M_dat.MH.MH_dat.MH_ext.ext_ref
+#define m_ext m_ext_ref->m_ext_storage
+#define m_pktdat M_dat.MH.MH_dat.MH_databuf
+#define m_dat M_dat.M_databuf
/*
* Dummy mbuf structure to calculate the right values for MLEN/MHLEN, taking
@@ -318,11 +318,11 @@ struct _m_ext {
MBUF_DEFINE(_mbuf_dummy, 1, 1);
/* normal data len */
-#define MLEN (MSIZE - offsetof(struct _mbuf_dummy, m_dat))
+#define MLEN (MSIZE - offsetof(struct _mbuf_dummy, m_dat))
/* data len w/pkthdr */
-#define MHLEN (MSIZE - offsetof(struct _mbuf_dummy, m_pktdat))
+#define MHLEN (MSIZE - offsetof(struct _mbuf_dummy, m_pktdat))
-#define MINCLSIZE (MHLEN+MLEN+1) /* smallest amount to put in cluster */
+#define MINCLSIZE (MHLEN+MLEN+1) /* smallest amount to put in cluster */
/*
* The *real* struct mbuf
@@ -330,40 +330,40 @@ MBUF_DEFINE(_mbuf_dummy, 1, 1);
MBUF_DEFINE(mbuf, MHLEN, MLEN);
/* mbuf flags */
-#define M_EXT 0x00000001 /* has associated external storage */
-#define M_PKTHDR 0x00000002 /* start of record */
-#define M_EOR 0x00000004 /* end of record */
-#define M_PROTO1 0x00000008 /* protocol-specific */
+#define M_EXT 0x00000001 /* has associated external storage */
+#define M_PKTHDR 0x00000002 /* start of record */
+#define M_EOR 0x00000004 /* end of record */
+#define M_PROTO1 0x00000008 /* protocol-specific */
/* mbuf pkthdr flags, also in m_flags */
-#define M_AUTHIPHDR 0x00000010 /* authenticated (IPsec) */
-#define M_DECRYPTED 0x00000020 /* decrypted (IPsec) */
-#define M_LOOP 0x00000040 /* received on loopback */
-#define M_BCAST 0x00000100 /* send/received as L2 broadcast */
-#define M_MCAST 0x00000200 /* send/received as L2 multicast */
-#define M_CANFASTFWD 0x00000400 /* packet can be fast-forwarded */
-#define M_ANYCAST6 0x00000800 /* received as IPv6 anycast */
-
-#define M_LINK0 0x00001000 /* link layer specific flag */
-#define M_LINK1 0x00002000 /* link layer specific flag */
-#define M_LINK2 0x00004000 /* link layer specific flag */
-#define M_LINK3 0x00008000 /* link layer specific flag */
-#define M_LINK4 0x00010000 /* link layer specific flag */
-#define M_LINK5 0x00020000 /* link layer specific flag */
-#define M_LINK6 0x00040000 /* link layer specific flag */
-#define M_LINK7 0x00080000 /* link layer specific flag */
+#define M_AUTHIPHDR 0x00000010 /* authenticated (IPsec) */
+#define M_DECRYPTED 0x00000020 /* decrypted (IPsec) */
+#define M_LOOP 0x00000040 /* received on loopback */
+#define M_BCAST 0x00000100 /* send/received as L2 broadcast */
+#define M_MCAST 0x00000200 /* send/received as L2 multicast */
+#define M_CANFASTFWD 0x00000400 /* packet can be fast-forwarded */
+#define M_ANYCAST6 0x00000800 /* received as IPv6 anycast */
+
+#define M_LINK0 0x00001000 /* link layer specific flag */
+#define M_LINK1 0x00002000 /* link layer specific flag */
+#define M_LINK2 0x00004000 /* link layer specific flag */
+#define M_LINK3 0x00008000 /* link layer specific flag */
+#define M_LINK4 0x00010000 /* link layer specific flag */
+#define M_LINK5 0x00020000 /* link layer specific flag */
+#define M_LINK6 0x00040000 /* link layer specific flag */
+#define M_LINK7 0x00080000 /* link layer specific flag */
-#define M_VLANTAG 0x00100000 /* ether_vtag is valid */
+#define M_VLANTAG 0x00100000 /* ether_vtag is valid */
/* additional flags for M_EXT mbufs */
-#define M_EXT_FLAGS 0xff000000
-#define M_EXT_CLUSTER 0x01000000 /* ext is a cluster */
-#define M_EXT_PAGES 0x02000000 /* ext_pgs is valid */
-#define M_EXT_ROMAP 0x04000000 /* ext mapping is r-o at MMU */
-#define M_EXT_RW 0x08000000 /* ext storage is writable */
+#define M_EXT_FLAGS 0xff000000
+#define M_EXT_CLUSTER 0x01000000 /* ext is a cluster */
+#define M_EXT_PAGES 0x02000000 /* ext_pgs is valid */
+#define M_EXT_ROMAP 0x04000000 /* ext mapping is r-o at MMU */
+#define M_EXT_RW 0x08000000 /* ext storage is writable */
/* for source-level compatibility */
-#define M_NOTIFICATION M_PROTO1
+#define M_NOTIFICATION M_PROTO1
#define M_FLAGS_BITS \
"\20\1EXT\2PKTHDR\3EOR\4PROTO1\5AUTHIPHDR\6DECRYPTED\7LOOP\10NONE" \
@@ -373,20 +373,20 @@ MBUF_DEFINE(mbuf, MHLEN, MLEN);
"\31EXT_CLUSTER\32EXT_PAGES\33EXT_ROMAP\34EXT_RW"
/* flags copied when copying m_pkthdr */
-#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_BCAST|M_MCAST|M_CANFASTFWD| \
+#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_BCAST|M_MCAST|M_CANFASTFWD| \
M_ANYCAST6|M_LINK0|M_LINK1|M_LINK2|M_AUTHIPHDR|M_DECRYPTED|M_LOOP| \
M_VLANTAG)
/* flag copied when shallow-copying external storage */
-#define M_EXTCOPYFLAGS (M_EXT|M_EXT_FLAGS)
+#define M_EXTCOPYFLAGS (M_EXT|M_EXT_FLAGS)
/* mbuf types */
-#define MT_FREE 0 /* should be on free list */
-#define MT_DATA 1 /* dynamic (data) allocation */
-#define MT_HEADER 2 /* packet header */
-#define MT_SONAME 3 /* socket name */
-#define MT_SOOPTS 4 /* socket options */
-#define MT_FTABLE 5 /* fragment reassembly header */
+#define MT_FREE 0 /* should be on free list */
+#define MT_DATA 1 /* dynamic (data) allocation */
+#define MT_HEADER 2 /* packet header */
+#define MT_SONAME 3 /* socket name */
+#define MT_SOOPTS 4 /* socket options */
+#define MT_FTABLE 5 /* fragment reassembly header */
#define MT_CONTROL 6 /* extra-data protocol message */
#define MT_OOBDATA 7 /* expedited data */
@@ -406,13 +406,11 @@ extern const char * const mbuftypes[];
#endif
/* flags to m_get/MGET */
-#define M_DONTWAIT M_NOWAIT
-#define M_WAIT M_WAITOK
+#define M_DONTWAIT M_NOWAIT
+#define M_WAIT M_WAITOK
#ifdef MBUFTRACE
-/*
- * mbuf allocation tracing
- */
+/* Mbuf allocation tracing. */
void mowner_init(struct mbuf *, int);
void mowner_ref(struct mbuf *, int);
void m_claim(struct mbuf *, struct mowner *);
@@ -421,18 +419,18 @@ void mowner_attach(struct mowner *);
void mowner_detach(struct mowner *);
void m_claimm(struct mbuf *, struct mowner *);
#else
-#define mowner_init(m, type) do { } while (/* CONSTCOND */ 0)
-#define mowner_ref(m, flags) do { } while (/* CONSTCOND */ 0)
-#define mowner_revoke(m, all, flags) do { } while (/* CONSTCOND */ 0)
-#define m_claim(m, mowner) do { } while (/* CONSTCOND */ 0)
-#define mowner_attach(mo) do { } while (/* CONSTCOND */ 0)
-#define mowner_detach(mo) do { } while (/* CONSTCOND */ 0)
-#define m_claimm(m, mo) do { } while (/* CONSTCOND */ 0)
+#define mowner_init(m, type) __nothing
+#define mowner_ref(m, flags) __nothing
+#define mowner_revoke(m, all, flags) __nothing
+#define m_claim(m, mowner) __nothing
+#define mowner_attach(mo) __nothing
+#define mowner_detach(mo) __nothing
+#define m_claimm(m, mo) __nothing
#endif
-#define MCLAIM(m, mo) m_claim((m), (mo))
-#define MOWNER_ATTACH(mo) mowner_attach(mo)
-#define MOWNER_DETACH(mo) mowner_detach(mo)
+#define MCLAIM(m, mo) m_claim((m), (mo))
+#define MOWNER_ATTACH(mo) mowner_attach(mo)
+#define MOWNER_DETACH(mo) mowner_detach(mo)
/*
* mbuf allocation/deallocation macros:
@@ -447,13 +445,12 @@ void m_claimm(struct mbuf *, struct mown
* If 'how' is M_WAIT, these macros (and the corresponding functions)
* are guaranteed to return successfully.
*/
-#define MGET(m, how, type) m = m_get((how), (type))
-#define MGETHDR(m, how, type) m = m_gethdr((how), (type))
+#define MGET(m, how, type) m = m_get((how), (type))
+#define MGETHDR(m, how, type) m = m_gethdr((how), (type))
#if defined(_KERNEL)
-#define _M_
-#define MCLINITREFERENCE(m) \
+#define MCLINITREFERENCE(m) \
do { \
KASSERT(((m)->m_flags & M_EXT) == 0); \
(m)->m_ext_ref = (m); \
@@ -473,9 +470,9 @@ do { \
* a normal mbuf; the flag M_EXT is set upon success.
*/
-#define MCLGET(m, how) m_clget((m), (how))
+#define MCLGET(m, how) m_clget((m), (how))
-#define MEXTMALLOC(m, size, how) \
+#define MEXTMALLOC(m, size, how) \
do { \
(m)->m_ext_storage.ext_buf = malloc((size), 0, (how)); \
if ((m)->m_ext_storage.ext_buf != NULL) { \
@@ -490,7 +487,7 @@ do { \
} \
} while (/* CONSTCOND */ 0)
-#define MEXTADD(m, buf, size, type, free, arg) \
+#define MEXTADD(m, buf, size, type, free, arg) \
do { \
MCLINITREFERENCE(m); \
(m)->m_data = (m)->m_ext.ext_buf = (char *)(buf); \
@@ -504,7 +501,7 @@ do { \
/*
* Reset the data pointer on an mbuf.
*/
-#define MRESETDATA(m) \
+#define MRESETDATA(m) \
do { \
if ((m)->m_flags & M_EXT) \
(m)->m_data = (m)->m_ext.ext_buf; \
@@ -519,54 +516,55 @@ do { \
* if external storage is read-only mapped, or not marked as R/W,
* or referenced by more than one mbuf.
*/
-#define M_READONLY(m) \
+#define M_READONLY(m) \
(((m)->m_flags & M_EXT) != 0 && \
(((m)->m_flags & (M_EXT_ROMAP|M_EXT_RW)) != M_EXT_RW || \
(m)->m_ext.ext_refcnt > 1))
-#define M_UNWRITABLE(__m, __len) \
+#define M_UNWRITABLE(__m, __len) \
((__m)->m_len < (__len) || M_READONLY((__m)))
+
/*
* Determine if an mbuf's data area is read-only at the MMU.
*/
-#define M_ROMAP(m) \
+#define M_ROMAP(m) \
(((m)->m_flags & (M_EXT|M_EXT_ROMAP)) == (M_EXT|M_EXT_ROMAP))
/*
* Compute the amount of space available
* before the current start of data in an mbuf.
*/
-#define _M_LEADINGSPACE(m) \
+#define _M_LEADINGSPACE(m) \
((m)->m_flags & M_EXT ? (m)->m_data - (m)->m_ext.ext_buf : \
(m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
(m)->m_data - (m)->m_dat)
-#define M_LEADINGSPACE(m) \
+#define M_LEADINGSPACE(m) \
(M_READONLY((m)) ? 0 : _M_LEADINGSPACE((m)))
/*
* Compute the amount of space available
* after the end of data in an mbuf.
*/
-#define _M_TRAILINGSPACE(m) \
+#define _M_TRAILINGSPACE(m) \
((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size - \
((m)->m_data + (m)->m_len) : \
&(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
-#define M_TRAILINGSPACE(m) \
+#define M_TRAILINGSPACE(m) \
(M_READONLY((m)) ? 0 : _M_TRAILINGSPACE((m)))
/*
* Compute the address of an mbuf's data area.
*/
-#define M_BUFADDR(m) \
+#define M_BUFADDR(m) \
(((m)->m_flags & M_PKTHDR) ? (m)->m_pktdat : (m)->m_dat)
/*
* Compute the offset of the beginning of the data buffer of a non-ext
* mbuf.
*/
-#define M_BUFOFFSET(m) \
+#define M_BUFOFFSET(m) \
(((m)->m_flags & M_PKTHDR) ? \
offsetof(struct mbuf, m_pktdat) : offsetof(struct mbuf, m_dat))
@@ -576,7 +574,7 @@ do { \
* If how is M_DONTWAIT and allocation fails, the original mbuf chain
* is freed and m is set to NULL.
*/
-#define M_PREPEND(m, plen, how) \
+#define M_PREPEND(m, plen, how) \
do { \
if (M_LEADINGSPACE(m) >= (plen)) { \
(m)->m_data -= (plen); \
@@ -599,18 +597,18 @@ do { \
#ifdef DIAGNOSTIC
#define M_VERIFY_PACKET(m) m_verify_packet(m)
#else
-#define M_VERIFY_PACKET(m) /* nothing */
+#define M_VERIFY_PACKET(m) __nothing
#endif
/* The "copy all" special length. */
-#define M_COPYALL -1
+#define M_COPYALL -1
/*
* Allow drivers and/or protocols to store private context information.
*/
-#define M_GETCTX(m, t) ((t)(m)->m_pkthdr._rcvif.ctx)
-#define M_SETCTX(m, c) ((void)((m)->m_pkthdr._rcvif.ctx = (void *)(c)))
-#define M_CLEARCTX(m) M_SETCTX((m), NULL)
+#define M_GETCTX(m, t) ((t)(m)->m_pkthdr._rcvif.ctx)
+#define M_SETCTX(m, c) ((void)((m)->m_pkthdr._rcvif.ctx = (void *)(c)))
+#define M_CLEARCTX(m) M_SETCTX((m), NULL)
/*
* M_REGION_GET ensures that the "len"-sized region of type "typ" starting
@@ -671,7 +669,7 @@ struct name { \
} while (/*CONSTCOND*/0)
#define MBUFQ_DEQUEUE(q, m) do { \
- if (((m) = (q)->mq_first) != NULL) { \
+ if (((m) = (q)->mq_first) != NULL) { \
if (((q)->mq_first = (m)->m_nextpkt) == NULL) \
(q)->mq_last = &(q)->mq_first; \
else \
@@ -715,15 +713,15 @@ struct mbstat_cpu {
/*
* Mbuf sysctl variables.
*/
-#define MBUF_MSIZE 1 /* int: mbuf base size */
-#define MBUF_MCLBYTES 2 /* int: mbuf cluster size */
-#define MBUF_NMBCLUSTERS 3 /* int: limit on the # of clusters */
-#define MBUF_MBLOWAT 4 /* int: mbuf low water mark */
-#define MBUF_MCLLOWAT 5 /* int: mbuf cluster low water mark */
-#define MBUF_STATS 6 /* struct: mbstat */
-#define MBUF_MOWNERS 7 /* struct: m_owner[] */
+#define MBUF_MSIZE 1 /* int: mbuf base size */
+#define MBUF_MCLBYTES 2 /* int: mbuf cluster size */
+#define MBUF_NMBCLUSTERS 3 /* int: limit on the # of clusters */
+#define MBUF_MBLOWAT 4 /* int: mbuf low water mark */
+#define MBUF_MCLLOWAT 5 /* int: mbuf cluster low water mark */
+#define MBUF_STATS 6 /* struct: mbstat */
+#define MBUF_MOWNERS 7 /* struct: m_owner[] */
-#ifdef _KERNEL
+#ifdef _KERNEL
extern struct mbstat mbstat;
extern int nmbclusters; /* limit on the # of clusters */
extern int mblowat; /* mbuf low water mark */
