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freebsd-nq/sys/netatm/port.h
Sam Leffler 9967cafc49 Correct mbuf packet header propagation. Previously, packet headers 
were sometimes propagated using M_COPY_PKTHDR which actually did
something between a "move" and a  "copy" operation.  This is replaced
by M_MOVE_PKTHDR (which copies the pkthdr contents and "removes" it
from the source mbuf) and m_dup_pkthdr which copies the packet
header contents including any m_tag chain.  This corrects numerous
problems whereby mbuf tags could be lost during packet manipulations.

These changes also introduce arguments to m_tag_copy and m_tag_copy_chain
to specify if the tag copy work should potentially block.  This
introduces an incompatibility with openbsd which we may want to revisit.

Note that move/dup of packet headers does not handle target mbufs
that have a cluster bound to them.  We may want to support this;
for now we watch for it with an assert.

Finally, M_COPYFLAGS was updated to include M_FIRSTFRAG|M_LASTFRAG.

Supported by:	Vernier Networks
Reviewed by:	Robert Watson <rwatson@FreeBSD.org>
2002-12-30 20:22:40 +00:00

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/*
*
* ===================================
* HARP | Host ATM Research Platform
* ===================================
*
*
* This Host ATM Research Platform ("HARP") file (the "Software") is
* made available by Network Computing Services, Inc. ("NetworkCS")
* "AS IS". NetworkCS does not provide maintenance, improvements or
* support of any kind.
*
* NETWORKCS MAKES NO WARRANTIES OR REPRESENTATIONS, EXPRESS OR IMPLIED,
* INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE, AS TO ANY ELEMENT OF THE
* SOFTWARE OR ANY SUPPORT PROVIDED IN CONNECTION WITH THIS SOFTWARE.
* In no event shall NetworkCS be responsible for any damages, including
* but not limited to consequential damages, arising from or relating to
* any use of the Software or related support.
*
* Copyright 1994-1998 Network Computing Services, Inc.
*
* Copies of this Software may be made, however, the above copyright
* notice must be reproduced on all copies.
*
* @(#) $FreeBSD$
*
*/
/*
* System Configuration
* --------------------
*
* Porting aides
*
*/
#ifndef _NETATM_PORT_H
#define _NETATM_PORT_H
#ifdef _KERNEL
/*
* Kernel buffers
*
* KBuffer Typedef for a kernel buffer.
*
* KB_NEXT(bfr) Access next buffer in chain (r/w).
* KB_LEN(bfr) Access length of data in this buffer (r/w).
* KB_QNEXT(bfr) Access next buffer in queue (r/w).
*
* KB_ALLOC(bfr, size, flags, type)
* Allocates a new kernel buffer of at least size bytes.
* KB_ALLOCPKT(bfr, size, flags, type)
* Allocates a new kernel packet header buffer of at
* least size bytes.
* KB_ALLOCEXT(bfr, size, flags, type)
* Allocates a new kernel buffer with external storage
* of at least size bytes.
* KB_FREEONE(bfr, nxt) Free buffer bfr and set next buffer in chain in nxt.
* KB_FREEALL(bfr) Free bfr's entire buffer chain.
* KB_COPY(bfr, off, len, new, flags)
* Copy len bytes of user data from buffer bfr starting at
* byte offset off and return new buffer chain in new.
* If len is KB_COPYALL, copy until end of chain.
* KB_COPYDATA(bfr, off, len, datap)
* Copy data from buffer bfr starting at byte offset off
* for len bytes into the data area pointed to by datap.
* Returns the number of bytes not copied to datap.
* KB_PULLUP(bfr, n, new)
* Get at least the first n bytes of data in the buffer
* chain headed by bfr contiguous in the first buffer.
* Returns the (potentially new) head of the chain in new.
* On failure the chain is freed and NULL is returned.
* KB_LINKHEAD(new, head)
* Link the kernel buffer new at the head of the buffer
* chain headed by head. If both new and head are
* packet header buffers, new will become the packet
* header for the chain.
* KB_LINK(new, prev)
* Link the kernel buffer new into the buffer chain
* after the buffer prev.
* KB_UNLINKHEAD(head, next)
* Unlink the kernel buffer from the head of the buffer
* chain headed by head. The buffer head will be freed
* and the new chain head will be placed in next.
* KB_UNLINK(old, prev, next)
* Unlink the kernel buffer old with previous buffer prev
* from its buffer chain. The following buffer in the
* chain will be placed in next and the buffer old will
* be freed.
* KB_ISPKT(bfr) Tests whether bfr is a packet header buffer.
* KB_ISEXT(bfr) Tests whether bfr has external storage.
* KB_BFRSTART(bfr, x, t)
* Sets x (cast to type t) to point to the start of the
* buffer space in bfr.
* KB_BFREND(bfr, x, t)
* Sets x (cast to type t) to point one byte past the end
* of the buffer space in bfr.
* KB_BFRLEN(bfr) Returns length of buffer space in bfr.
* KB_DATASTART(bfr, x, t)
* Sets x (cast to type t) to point to the start of the
* buffer data contained in bfr.
* KB_DATAEND(bfr, x, t)
* Sets x (cast to type t) to point one byte past the end
* of the buffer data contained in bfr.
* KB_HEADSET(bfr, n) Sets the start address for buffer data in buffer bfr to
* n bytes from the beginning of the buffer space.
* KB_HEADMOVE(bfr, n) Adjust buffer data controls to move data down (n > 0)
* or up (n < 0) n bytes in the buffer bfr.
* KB_HEADADJ(bfr, n) Adjust buffer data controls to add (n > 0) or subtract
* (n < 0) n bytes of data to/from the beginning of bfr.
* KB_TAILADJ(bfr, n) Adjust buffer data controls to add (n > 0) or subtract
* (n < 0) n bytes of data to/from the end of bfr.
* KB_TAILALIGN(bfr, n) Set buffer data controls to place an object of size n
* at the end of bfr, longword aligned.
* KB_HEADROOM(bfr, n) Set n to the amount of buffer space available before
* the start of data in bfr.
* KB_TAILROOM(bfr, n) Set n to the amount of buffer space available after
* the end of data in bfr.
* KB_PLENGET(bfr, n) Set n to bfr's packet length.
* KB_PLENSET(bfr, n) Set bfr's packet length to n.
* KB_PLENADJ(bfr, n) Adjust total packet length by n bytes.
*
*/
#include <sys/mbuf.h>
typedef struct mbuf KBuffer;
#define KB_F_WAIT M_TRYWAIT
#define KB_F_NOWAIT M_DONTWAIT
#define KB_T_HEADER MT_HEADER
#define KB_T_DATA MT_DATA
#define KB_COPYALL M_COPYALL
#define KB_NEXT(bfr) (bfr)->m_next
#define KB_LEN(bfr) (bfr)->m_len
#define KB_QNEXT(bfr) (bfr)->m_nextpkt
#define KB_ALLOC(bfr, size, flags, type) { \
if ((size) <= MLEN) { \
MGET((bfr), (flags), (type)); \
} else \
(bfr) = NULL; \
}
#define KB_ALLOCPKT(bfr, size, flags, type) { \
if ((size) <= MHLEN) { \
MGETHDR((bfr), (flags), (type)); \
} else \
(bfr) = NULL; \
}
#define KB_ALLOCEXT(bfr, size, flags, type) { \
if ((size) <= MCLBYTES) { \
MGET((bfr), (flags), (type)); \
if ((bfr) != NULL) { \
MCLGET((bfr), (flags)); \
if (((bfr)->m_flags & M_EXT) == 0) { \
m_freem((bfr)); \
(bfr) = NULL; \
} \
} \
} else \
(bfr) = NULL; \
}
#define KB_FREEONE(bfr, nxt) { \
(nxt) = m_free(bfr); \
}
#define KB_FREEALL(bfr) { \
m_freem(bfr); \
}
#define KB_COPY(bfr, off, len, new, flags) { \
(new) = m_copym((bfr), (off), (len), (flags)); \
}
#define KB_COPYDATA(bfr, off, len, datap) \
(m_copydata((bfr), (off), (len), (datap)), 0)
#define KB_PULLUP(bfr, n, new) { \
(new) = m_pullup((bfr), (n)); \
}
#define KB_LINKHEAD(new, head) { \
if ((head) && KB_ISPKT(new) && KB_ISPKT(head)) {\
M_MOVE_PKTHDR((new), (head)); \
} \
(new)->m_next = (head); \
}
#define KB_LINK(new, prev) { \
(new)->m_next = (prev)->m_next; \
(prev)->m_next = (new); \
}
#define KB_UNLINKHEAD(head, next) { \
(next) = m_free((head)); \
(head) = NULL; \
}
#define KB_UNLINK(old, prev, next) { \
(next) = m_free((old)); \
(old) = NULL; \
(prev)->m_next = (next); \
}
#define KB_ISPKT(bfr) (((bfr)->m_flags & M_PKTHDR) != 0)
#define KB_ISEXT(bfr) (((bfr)->m_flags & M_EXT) != 0)
#define KB_BFRSTART(bfr, x, t) { \
if ((bfr)->m_flags & M_EXT) \
(x) = (t)((bfr)->m_ext.ext_buf); \
else if ((bfr)->m_flags & M_PKTHDR) \
(x) = (t)(&(bfr)->m_pktdat); \
else \
(x) = (t)((bfr)->m_dat); \
}
#define KB_BFREND(bfr, x, t) { \
if ((bfr)->m_flags & M_EXT) \
(x) = (t)((bfr)->m_ext.ext_buf + (bfr)->m_ext.ext_size);\
else if ((bfr)->m_flags & M_PKTHDR) \
(x) = (t)(&(bfr)->m_pktdat + MHLEN); \
else \
(x) = (t)((bfr)->m_dat + MLEN); \
}
#define KB_BFRLEN(bfr) \
(((bfr)->m_flags & M_EXT) ? (bfr)->m_ext.ext_size : \
(((bfr)->m_flags & M_PKTHDR) ? MHLEN : MLEN))
#define KB_DATASTART(bfr, x, t) { \
(x) = mtod((bfr), t); \
}
#define KB_DATAEND(bfr, x, t) { \
(x) = (t)(mtod((bfr), caddr_t) + (bfr)->m_len); \
}
#define KB_HEADSET(bfr, n) { \
if ((bfr)->m_flags & M_EXT) \
(bfr)->m_data = (bfr)->m_ext.ext_buf + (n); \
else if ((bfr)->m_flags & M_PKTHDR) \
(bfr)->m_data = (bfr)->m_pktdat + (n); \
else \
(bfr)->m_data = (bfr)->m_dat + (n); \
}
#define KB_HEADMOVE(bfr, n) { \
(bfr)->m_data += (n); \
}
#define KB_HEADADJ(bfr, n) { \
(bfr)->m_len += (n); \
(bfr)->m_data -= (n); \
}
#define KB_TAILADJ(bfr, n) { \
(bfr)->m_len += (n); \
}
#define KB_TAILALIGN(bfr, n) { \
(bfr)->m_len = (n); \
if ((bfr)->m_flags & M_EXT) \
(bfr)->m_data = (caddr_t)(((uintptr_t)(bfr)->m_ext.ext_buf \
+ (bfr)->m_ext.ext_size - (n)) & ~(sizeof(long) - 1));\
else \
(bfr)->m_data = (caddr_t)(((uintptr_t)(bfr)->m_dat + MLEN - (n)) \
& ~(sizeof(long) - 1)); \
}
#define KB_HEADROOM(bfr, n) { \
/* N = m_leadingspace(BFR) XXX */ \
(n) = ((bfr)->m_flags & M_EXT ? (bfr)->m_data - (bfr)->m_ext.ext_buf : \
(bfr)->m_flags & M_PKTHDR ? (bfr)->m_data - (bfr)->m_pktdat : \
(bfr)->m_data - (bfr)->m_dat); \
}
#define KB_TAILROOM(bfr, n) { \
(n) = M_TRAILINGSPACE(bfr); \
}
#define KB_PLENGET(bfr, n) { \
(n) = (bfr)->m_pkthdr.len; \
}
#define KB_PLENSET(bfr, n) { \
(bfr)->m_pkthdr.len = (n); \
}
#define KB_PLENADJ(bfr, n) { \
(bfr)->m_pkthdr.len += (n); \
}
/*
* Kernel time
*
* KTimeout_ret Typedef for timeout() function return
*
* KT_TIME(t) Sets t to the current time.
*
*/
typedef void KTimeout_ret;
#define KT_TIME(t) microtime(&t)
#endif /* _KERNEL */
#ifndef NTOHL
#if BYTE_ORDER == BIG_ENDIAN
#define NTOHL(x) (x)
#define NTOHS(x) (x)
#define HTONL(x) (x)
#define HTONS(x) (x)
#else
#define NTOHL(x) (x) = ntohl((u_long)(x))
#define NTOHS(x) (x) = ntohs((u_short)(x))
#define HTONL(x) (x) = htonl((u_long)(x))
#define HTONS(x) (x) = htons((u_short)(x))
#endif
#endif /* NTOHL */
#ifndef MAX
#define MAX(a,b) max((a),(b))
#endif
#ifndef MIN
#define MIN(a,b) min((a),(b))
#endif
#endif /* _NETATM_PORT_H */
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