mbuf.h

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									\
	if (mmbfree == NULL)						\
		(void)m_mballoc(1, _mhow);				\
	_mm = mmbfree;							\
	if (_mm != NULL) {						\
		mmbfree = _mm->m_next;					\
		mbtypes[MT_FREE]--;					\
		_mm->m_type = _mtype;					\
		mbtypes[_mtype]++;					\
		_mm->m_next = NULL;					\
		_mm->m_nextpkt = NULL;					\
		_mm->m_data = _mm->m_dat;				\
		_mm->m_flags = 0;					\
		(m) = _mm;						\
		splx(_ms);						\
	} else {							\
		splx(_ms);						\
		_mm = m_retry(_mhow, _mtype);				\
		if (_mm == NULL && _mhow == M_WAIT)			\
			(m) = m_mballoc_wait(MGET_C, _mtype);		\
		else							\
			(m) = _mm;					\
	}								\
} while (0)

#define	MGETHDR(m, how, type) do {					\
	struct mbuf *_mm;						\
	int _mhow = (how);						\
	int _mtype = (type);						\
	int _ms = splimp();						\
									\
	if (mmbfree == NULL)						\
		(void)m_mballoc(1, _mhow);				\
	_mm = mmbfree;							\
	if (_mm != NULL) {						\
		mmbfree = _mm->m_next;					\
		mbtypes[MT_FREE]--;					\
		_mm->m_type = _mtype;					\
		mbtypes[_mtype]++;					\
		_mm->m_next = NULL;					\
		_mm->m_nextpkt = NULL;					\
		_mm->m_data = _mm->m_pktdat;				\
		_mm->m_flags = M_PKTHDR;				\
		bzero(&(_mm)->m_pkthdr, sizeof((_mm)->m_pkthdr));	\
		(m) = _mm;						\
		splx(_ms);						\
	} else {							\
		splx(_ms);						\
		_mm = m_retryhdr(_mhow, _mtype);			\
		if (_mm == NULL && _mhow == M_WAIT)			\
			(m) = m_mballoc_wait(MGETHDR_C, _mtype);	\
		else							\
			(m) = _mm;					\
	}								\
} while (0)

/*
 * Mbuf cluster macros.
 * MCLALLOC(caddr_t p, int how) allocates an mbuf cluster.
 * MCLGET adds such clusters to a normal mbuf;
 * the flag M_EXT is set upon success.
 * MCLFREE releases a reference to a cluster allocated by MCLALLOC,
 * freeing the cluster if the reference count has reached 0.
 */
#define	MCLALLOC(p, how) do {						\
	caddr_t _mp;							\
	int _mhow = (how);						\
	int _ms = splimp();						\
									\
	if (mclfree == NULL)						\
		(void)m_clalloc(1, _mhow);				\
	_mp = (caddr_t)mclfree;						\
	if (_mp != NULL) {						\
		mclrefcnt[mtocl(_mp)]++;				\
		mbstat.m_clfree--;					\
		mclfree = ((union mcluster *)_mp)->mcl_next;		\
		(p) = _mp;						\
		splx(_ms);						\
	} else {							\
		splx(_ms);						\
		if (_mhow == M_WAIT)					\
			(p) = m_clalloc_wait();				\
		else							\
			(p) = NULL;					\
	}								\
} while (0)	

#define	MCLGET(m, how) do {						\
	struct mbuf *_mm = (m);						\
									\
	MCLALLOC(_mm->m_ext.ext_buf, (how));				\
	if (_mm->m_ext.ext_buf != NULL) {				\
		_mm->m_data = _mm->m_ext.ext_buf;			\
		_mm->m_flags |= M_EXT;					\
		_mm->m_ext.ext_free = NULL;				\
		_mm->m_ext.ext_ref = NULL;				\
		_mm->m_ext.ext_size = MCLBYTES;				\
	}								\
} while (0)

#define	MCLFREE1(p) do {						\
	union mcluster *_mp = (union mcluster *)(p);			\
									\
	/* KASSERT(mclrefcnt[mtocl(_mp)] > 0, ("freeing free cluster")); */	\
	if (--mclrefcnt[mtocl(_mp)] == 0) {				\
		_mp->mcl_next = mclfree;				\
		mclfree = _mp;						\
		mbstat.m_clfree++;					\
		MCLWAKEUP();						\
	}								\
} while (0)

#define	MCLFREE(p) MBUFLOCK(						\
	MCLFREE1(p);							\
)

#define	MEXTFREE1(m) do {						\
		struct mbuf *_mm = (m);					\
									\
		if (_mm->m_ext.ext_free != NULL)			\
			(*_mm->m_ext.ext_free)(_mm->m_ext.ext_buf,	\
		    	    _mm->m_ext.ext_size);			\
		else							\
			MCLFREE1(_mm->m_ext.ext_buf);			\
} while (0)

#define	MEXTFREE(m) MBUFLOCK(						\
	MEXTFREE1(m);							\
)

/*
 * MFREE(struct mbuf *m, struct mbuf *n)
 * Free a single mbuf and associated external storage.
 * Place the successor, if any, in n.
 *
 * we do need to check non-first mbuf for m_aux, since some of existing
 * code does not call M_PREPEND properly.
 * (example: call to bpf_mtap from drivers)
 */
#define	MFREE(m, n) MBUFLOCK(						\
	struct mbuf *_mm = (m);						\
									\
	/* KASSERT(_mm->m_type != MT_FREE, ("freeing free mbuf")); */		\
	mbtypes[_mm->m_type]--;						\
	if ((_mm->m_flags & M_PKTHDR) != 0 && _mm->m_pkthdr.aux) {	\
		m_freem(_mm->m_pkthdr.aux);				\
		_mm->m_pkthdr.aux = NULL;				\
	}								\
	if (_mm->m_flags & M_EXT)					\
		MEXTFREE1(m);						\
	(n) = _mm->m_next;						\
	_mm->m_type = MT_FREE;						\
	mbtypes[MT_FREE]++;						\
	_mm->m_next = mmbfree;						\
	mmbfree = _mm;							\
	MMBWAKEUP();							\
)

/*
 * Copy mbuf pkthdr from "from" to "to".
 * from must have M_PKTHDR set, and to must be empty.
 * aux pointer will be moved to `to'.
 */
#define	M_COPY_PKTHDR(to, from) do {					\
	struct mbuf *_mfrom = (from);					\
	struct mbuf *_mto = (to);					\
									\
	_mto->m_data = _mto->m_pktdat;					\
	_mto->m_flags = _mfrom->m_flags & M_COPYFLAGS;			\
	_mto->m_pkthdr = _mfrom->m_pkthdr;				\
	_mfrom->m_pkthdr.aux = (struct mbuf *)NULL;			\
} while (0)

/*
 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
 * an object of the specified size at the end of the mbuf, longword aligned.
 */
#define	M_ALIGN(m, len) do {						\
	(m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1);		\
} while (0)

/*
 * As above, for mbufs allocated with m_gethdr/MGETHDR
 * or initialized by M_COPY_PKTHDR.
 */
#define	MH_ALIGN(m, len) do {						\
	(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1);		\
} while (0)

/*
 * Check if we can write to an mbuf.
 */
#define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || \
    ((m)->m_ext.ext_free == NULL && mclrefcnt[mtocl((m)->m_ext.ext_buf)] == 1))

/*
 * Compute the amount of space available
 * before the current start of data in an mbuf.
 */
#define	M_LEADINGSPACE(m)						\
	((m)->m_flags & M_EXT ?						\
	    /* (m)->m_data - (m)->m_ext.ext_buf */ 0 :			\
	    (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :	\
	    (m)->m_data - (m)->m_dat)

/*
 * Compute the amount of space available
 * after the end of data in an mbuf.
 */
#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))

/*
 * Arrange to prepend space of size plen to mbuf m.
 * If a new mbuf must be allocated, how specifies whether to wait.
 * 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) do {					\
	struct mbuf **_mmp = &(m);					\
	struct mbuf *_mm = *_mmp;					\
	int _mplen = (plen);						\
	int __mhow = (how);						\
									\
	if (M_LEADINGSPACE(_mm) >= _mplen) {				\
		_mm->m_data -= _mplen;					\
		_mm->m_len += _mplen;					\
	} else								\
		_mm = m_prepend(_mm, _mplen, __mhow);			\
	if (_mm != NULL && _mm->m_flags & M_PKTHDR)			\
		_mm->m_pkthdr.len += _mplen;				\
	*_mmp = _mm;							\
} while (0)

/* change mbuf to new type */
#define	MCHTYPE(m, t) do {						\
	struct mbuf *_mm = (m);						\
	int _mt = (t);							\
	int _ms = splimp();						\
									\
	mbtypes[_mm->m_type]--;						\
	mbtypes[_mt]++;							\
	splx(_ms);							\
	_mm->m_type = (_mt);						\
} while (0)

/* length to m_copy to copy all */
#define	M_COPYALL	1000000000

/* compatibility with 4.3 */
#define	m_copy(m, o, l)	m_copym((m), (o), (l), M_DONTWAIT)

/*
 * pkthdr.aux type tags.
 */
struct mauxtag {
	int	af;
	int	type;
	void*	p;
};

#ifdef _KERNEL
extern	u_int		 m_clalloc_wid;	/* mbuf cluster wait count */
extern	u_int		 m_mballoc_wid;	/* mbuf wait count */
extern	int		 max_linkhdr;	/* largest link-level header */
extern	int		 max_protohdr;	/* largest protocol header */
extern	int		 max_hdr;	/* largest link+protocol header */
extern	int		 max_datalen;	/* MHLEN - max_hdr */
extern	struct mbstat	 mbstat;
extern	u_long		 mbtypes[MT_NTYPES]; /* per-type mbuf allocations */
extern	int		 mbuf_wait;	/* mbuf sleep time */
extern	struct mbuf	*mbutl;		/* virtual address of mclusters */
extern	char		*mclrefcnt;	/* cluster reference counts */
extern	union mcluster	*mclfree;
extern	struct mbuf	*mmbfree;
extern	int		 nmbclusters;
extern	int		 nmbufs;
extern	int		 nsfbufs;

void	m_adj __P((struct mbuf *, int));
void	m_cat __P((struct mbuf *,struct mbuf *));
int	m_clalloc __P((int, int));
caddr_t	m_clalloc_wait __P((void));
void	m_copyback __P((struct mbuf *, int, int, caddr_t));
void	m_copydata __P((struct mbuf *,int,int,caddr_t));
struct	mbuf *m_copym __P((struct mbuf *, int, int, int));
struct	mbuf *m_copypacket __P((struct mbuf *, int));
struct	mbuf *m_devget __P((char *, int, int, struct ifnet *,
    void (*copy)(char *, caddr_t, u_int)));
struct	mbuf *m_dup __P((struct mbuf *, int));
struct	mbuf *m_free __P((struct mbuf *));
void	m_freem __P((struct mbuf *));
struct	mbuf *m_get __P((int, int));
struct	mbuf *m_getclr __P((int, int));
struct	mbuf *m_gethdr __P((int, int));
struct	mbuf *m_getm __P((struct mbuf *, int, int, int));
int	m_mballoc __P((int, int));
struct	mbuf *m_mballoc_wait __P((int, int));
struct	mbuf *m_prepend __P((struct mbuf *,int,int));
struct	mbuf *m_pulldown __P((struct mbuf *, int, int, int *));
void	m_print __P((const struct mbuf *m));
struct	mbuf *m_pullup __P((struct mbuf *, int));
struct	mbuf *m_retry __P((int, int));
struct	mbuf *m_retryhdr __P((int, int));
struct	mbuf *m_split __P((struct mbuf *,int,int));
struct	mbuf *m_aux_add2 __P((struct mbuf *, int, int, void *));
struct	mbuf *m_aux_find2 __P((struct mbuf *, int, int, void *));
struct	mbuf *m_aux_add __P((struct mbuf *, int, int));
struct	mbuf *m_aux_find __P((struct mbuf *, int, int));
void	m_aux_delete __P((struct mbuf *, struct mbuf *));
extern void *cyg_net_mbuf_alloc(void);
extern void *cyg_net_cluster_alloc(void );
#ifdef CYGDBG_NET_SHOW_MBUFS                
extern void cyg_net_show_mbufs(void);
#endif
#endif /* _KERNEL */

#endif /* !_SYS_MBUF_H_ */