freebsd compat. layer: a couple more definitions, minimal, mostly adding a new glue method to re-enable device interrupts since if_rl (rtl 8139) will require it.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21092 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/network/ipro1000/dev/em/glue.c

@@ -2,7 +2,8 @@
 
 HAIKU_FBSD_DRIVER_GLUE(e1000, em, pci)
 
-NO_HAIKU_CHECK_DISABLE_INTERRUPTS()
+NO_HAIKU_CHECK_DISABLE_INTERRUPTS();
+NO_HAIKU_REENABLE_INTERRUPTS();
 
 #ifdef EM_FAST_INTR
 	HAIKU_DRIVER_REQUIREMENTS(FBSD_TASKQUEUES | FBSD_FAST_TASKQUEUE);

src/add-ons/kernel/drivers/network/pcnet/dev/le/am79900.c

@@ -451,11 +451,11 @@ am79900_intr(void *arg)
 	isr = (*sc->sc_rdcsr)(sc, LE_CSR0);
 #endif
 	{
-		cpu_status status;
+		HAIKU_INTR_REGISTER_STATE;
-		HAIKU_INTR_REGISTER_ENTER(status);
+		HAIKU_INTR_REGISTER_ENTER();
 		isr = sc->sc_lastisr;
 		sc->sc_lastisr = 0;
-		HAIKU_INTR_REGISTER_LEAVE(status);
+		HAIKU_INTR_REGISTER_LEAVE();
 	}
 
 #if defined(LEDEBUG) && LEDEBUG > 1

src/add-ons/kernel/drivers/network/pcnet/dev/le/glue.c

@@ -32,10 +32,10 @@ struct le_pci_softc {
 
 int HAIKU_CHECK_DISABLE_INTERRUPTS(device_t dev) {
 	struct le_pci_softc *lesc = (struct le_pci_softc *)device_get_softc(dev);
-	cpu_status status;
+	HAIKU_INTR_REGISTER_STATE;
 	uint16_t value;
 
-	HAIKU_INTR_REGISTER_ENTER(status);
+	HAIKU_INTR_REGISTER_ENTER();
 
 	/* get current flags */
 	bus_space_write_2(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RAP, LE_CSR0);
@@ -54,7 +54,9 @@ int HAIKU_CHECK_DISABLE_INTERRUPTS(device_t dev) {
 		lesc->sc_am79900.lsc.sc_lastisr |= value;
 	}
 
-	HAIKU_INTR_REGISTER_LEAVE(status);
+	HAIKU_INTR_REGISTER_LEAVE();
 
 	return value & LE_C0_INTR;
 }
+
+NO_HAIKU_REENABLE_INTERRUPTS();

src/add-ons/kernel/drivers/network/pcnet/dev/le/if_le_pci.c

@@ -195,33 +195,33 @@ static void
 le_pci_wrcsr(struct lance_softc *sc, uint16_t port, uint16_t val)
 {
 	struct le_pci_softc *lesc = (struct le_pci_softc *)sc;
-	cpu_status status = 0;
+	HAIKU_INTR_REGISTER_STATE;
 
 	if (port == LE_CSR0)
-		HAIKU_INTR_REGISTER_ENTER(status);
+		HAIKU_INTR_REGISTER_ENTER();
 	bus_space_write_2(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RAP, port);
 	bus_space_barrier(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RAP, 2,
 	    BUS_SPACE_BARRIER_WRITE);
 	bus_space_write_2(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RDP, val);
 	if (port == LE_CSR0)
-		HAIKU_INTR_REGISTER_LEAVE(status);
+		HAIKU_INTR_REGISTER_LEAVE();
 }
 
 static uint16_t
 le_pci_rdcsr(struct lance_softc *sc, uint16_t port)
 {
 	struct le_pci_softc *lesc = (struct le_pci_softc *)sc;
-	cpu_status status = 0;
+	HAIKU_INTR_REGISTER_STATE;
 	uint16_t value;
 
 	if (port == LE_CSR0)
-		HAIKU_INTR_REGISTER_ENTER(status);
+		HAIKU_INTR_REGISTER_ENTER();
 	bus_space_write_2(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RAP, port);
 	bus_space_barrier(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RAP, 2,
 	    BUS_SPACE_BARRIER_WRITE);
 	value = bus_space_read_2(lesc->sc_regt, lesc->sc_regh, PCNET_PCI_RDP);
 	if (port == LE_CSR0)
-		HAIKU_INTR_REGISTER_LEAVE(status);
+		HAIKU_INTR_REGISTER_LEAVE();
 
 	return value;
 }

src/libs/compat/freebsd_network/bus.c

@@ -212,6 +212,7 @@ intr_handler(void *data)
 		device_printf(intr->dev, "in soft interrupt handler.\n");
 
 		intr->handler(intr->arg);
+		HAIKU_REENABLE_INTERRUPTS(intr->dev);
 	}
 
 	return 0;

src/libs/compat/freebsd_network/compat.c

@@ -314,6 +314,9 @@ _kernel_contigmalloc(const char *file, int line, size_t size, int flags,
 	if (area < 0)
 		return NULL;
 
+	if (flags & M_ZERO)
+		memset(addr, 0, size);
+
 	driver_printf("(%s) addr = %p, area = %ld, size = %lu\n",
 		name, addr, area, size);
 

src/libs/compat/freebsd_network/compat/dev/mii/mii.h

@@ -0,0 +1,206 @@
+/*	$NetBSD: mii.h,v 1.9 2001/05/31 03:07:14 thorpej Exp $	*/
+ 
+/*-
+ * Copyright (c) 1997 Manuel Bouyer.  All rights reserved.
+ *
+ * Modification to match BSD/OS 3.0 MII interface by Jason R. Thorpe,
+ * Numerical Aerospace Simulation Facility, NASA Ames Research Center.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Manuel Bouyer.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD: src/sys/dev/mii/mii.h,v 1.5 2005/01/06 01:42:56 imp Exp $
+ */
+
+#ifndef _DEV_MII_MII_H_
+#define	_DEV_MII_MII_H_
+
+/*
+ * Registers common to all PHYs.
+ */
+
+#define	MII_NPHY	32	/* max # of PHYs per MII */
+
+/*
+ * MII commands, used if a device must drive the MII lines
+ * manually.
+ */
+#define	MII_COMMAND_START	0x01
+#define	MII_COMMAND_READ	0x02
+#define	MII_COMMAND_WRITE	0x01
+#define	MII_COMMAND_ACK		0x02
+
+#define	MII_BMCR	0x00 	/* Basic mode control register (rw) */
+#define	BMCR_RESET	0x8000	/* reset */
+#define	BMCR_LOOP	0x4000	/* loopback */
+#define	BMCR_SPEED0	0x2000	/* speed selection (LSB) */
+#define	BMCR_AUTOEN	0x1000	/* autonegotiation enable */
+#define	BMCR_PDOWN	0x0800	/* power down */
+#define	BMCR_ISO	0x0400	/* isolate */
+#define	BMCR_STARTNEG	0x0200	/* restart autonegotiation */
+#define	BMCR_FDX	0x0100	/* Set duplex mode */
+#define	BMCR_CTEST	0x0080	/* collision test */
+#define	BMCR_SPEED1	0x0040	/* speed selection (MSB) */
+
+#define	BMCR_S10	0x0000		/* 10 Mb/s */
+#define	BMCR_S100	BMCR_SPEED0	/* 100 Mb/s */
+#define	BMCR_S1000	BMCR_SPEED1	/* 1000 Mb/s */
+
+#define	BMCR_SPEED(x)	((x) & (BMCR_SPEED0|BMCR_SPEED1))
+
+#define	MII_BMSR	0x01	/* Basic mode status register (ro) */
+#define	BMSR_100T4	0x8000	/* 100 base T4 capable */
+#define	BMSR_100TXFDX	0x4000	/* 100 base Tx full duplex capable */
+#define	BMSR_100TXHDX	0x2000	/* 100 base Tx half duplex capable */
+#define	BMSR_10TFDX	0x1000	/* 10 base T full duplex capable */
+#define	BMSR_10THDX	0x0800	/* 10 base T half duplex capable */
+#define	BMSR_100T2FDX	0x0400	/* 100 base T2 full duplex capable */
+#define	BMSR_100T2HDX	0x0200	/* 100 base T2 half duplex capable */
+#define	BMSR_EXTSTAT	0x0100	/* Extended status in register 15 */
+#define	BMSR_MFPS	0x0040	/* MII Frame Preamble Suppression */
+#define	BMSR_ACOMP	0x0020	/* Autonegotiation complete */
+#define	BMSR_RFAULT	0x0010	/* Link partner fault */
+#define	BMSR_ANEG	0x0008	/* Autonegotiation capable */
+#define	BMSR_LINK	0x0004	/* Link status */
+#define	BMSR_JABBER	0x0002	/* Jabber detected */
+#define	BMSR_EXTCAP	0x0001	/* Extended capability */
+
+/*
+ * Note that the EXTSTAT bit indicates that there is extended status
+ * info available in register 15, but 802.3 section 22.2.4.3 also
+ * states that that all 1000 Mb/s capable PHYs will set this bit to 1.
+ */
+#if 0
+#define	BMSR_MEDIAMASK	(BMSR_100T4|BMSR_100TXFDX|BMSR_100TXHDX|BMSR_10TFDX| \
+			 BMSR_10THDX|BMSR_ANEG)
+
+#else
+/* NetBSD uses: */
+#define	BMSR_MEDIAMASK	(BMSR_100T4|BMSR_100TXFDX|BMSR_100TXHDX| \
+			 BMSR_10TFDX|BMSR_10THDX|BMSR_100T2FDX|BMSR_100T2HDX)
+#endif
+
+/*
+ * Convert BMSR media capabilities to ANAR bits for autonegotiation.
+ * Note the shift chopps off the BMSR_ANEG bit.
+ */
+#define	BMSR_MEDIA_TO_ANAR(x)	(((x) & BMSR_MEDIAMASK) >> 6)
+
+#define	MII_PHYIDR1	0x02	/* ID register 1 (ro) */
+
+#define	MII_PHYIDR2	0x03	/* ID register 2 (ro) */
+#define	IDR2_OUILSB	0xfc00	/* OUI LSB */
+#define	IDR2_MODEL	0x03f0	/* vendor model */
+#define	IDR2_REV	0x000f	/* vendor revision */
+
+#define	MII_OUI(id1, id2)	(((id1) << 6) | ((id2) >> 10))
+#define	MII_MODEL(id2)		(((id2) & IDR2_MODEL) >> 4)
+#define	MII_REV(id2)		((id2) & IDR2_REV)
+
+#define	MII_ANAR	0x04	/* Autonegotiation advertisement (rw) */
+		/* section 28.2.4.1 and 37.2.6.1 */
+#define ANAR_NP		0x8000	/* Next page (ro) */
+#define	ANAR_ACK	0x4000	/* link partner abilities acknowledged (ro) */
+#define ANAR_RF		0x2000	/* remote fault (ro) */
+#define	ANAR_FC		0x0400	/* local device supports PAUSE */
+#define ANAR_T4		0x0200	/* local device supports 100bT4 */
+#define ANAR_TX_FD	0x0100	/* local device supports 100bTx FD */
+#define ANAR_TX		0x0080	/* local device supports 100bTx */
+#define ANAR_10_FD	0x0040	/* local device supports 10bT FD */
+#define ANAR_10		0x0020	/* local device supports 10bT */
+#define	ANAR_CSMA	0x0001	/* protocol selector CSMA/CD */
+
+#define	ANAR_X_FD	0x0020	/* local device supports 1000BASE-X FD */
+#define	ANAR_X_HD	0x0040	/* local device supports 1000BASE-X HD */
+#define	ANAR_X_PAUSE_NONE	(0 << 7)
+#define	ANAR_X_PAUSE_SYM	(1 << 7)
+#define	ANAR_X_PAUSE_ASYM	(2 << 7)
+#define	ANAR_X_PAUSE_TOWARDS	(3 << 7)
+
+#define	MII_ANLPAR	0x05	/* Autonegotiation lnk partner abilities (rw) */
+		/* section 28.2.4.1 and 37.2.6.1 */
+#define ANLPAR_NP	0x8000	/* Next page (ro) */
+#define	ANLPAR_ACK	0x4000	/* link partner accepted ACK (ro) */
+#define ANLPAR_RF	0x2000	/* remote fault (ro) */
+#define	ANLPAR_FC	0x0400	/* link partner supports PAUSE */
+#define ANLPAR_T4	0x0200	/* link partner supports 100bT4 */
+#define ANLPAR_TX_FD	0x0100	/* link partner supports 100bTx FD */
+#define ANLPAR_TX	0x0080	/* link partner supports 100bTx */
+#define ANLPAR_10_FD	0x0040	/* link partner supports 10bT FD */
+#define ANLPAR_10	0x0020	/* link partner supports 10bT */
+#define	ANLPAR_CSMA	0x0001	/* protocol selector CSMA/CD */
+
+#define	ANLPAR_X_FD	0x0020	/* local device supports 1000BASE-X FD */
+#define	ANLPAR_X_HD	0x0040	/* local device supports 1000BASE-X HD */
+#define	ANLPAR_X_PAUSE_MASK	(3 << 7)
+#define	ANLPAR_X_PAUSE_NONE	(0 << 7)
+#define	ANLPAR_X_PAUSE_SYM	(1 << 7)
+#define	ANLPAR_X_PAUSE_ASYM	(2 << 7)
+#define	ANLPAR_X_PAUSE_TOWARDS	(3 << 7)
+
+#define	MII_ANER	0x06	/* Autonegotiation expansion (ro) */
+		/* section 28.2.4.1 and 37.2.6.1 */
+#define ANER_MLF	0x0010	/* multiple link detection fault */
+#define ANER_LPNP	0x0008	/* link parter next page-able */
+#define ANER_NP		0x0004	/* next page-able */
+#define ANER_PAGE_RX	0x0002	/* Page received */
+#define ANER_LPAN	0x0001	/* link parter autoneg-able */
+
+#define	MII_ANNP	0x07	/* Autonegotiation next page */
+		/* section 28.2.4.1 and 37.2.6.1 */
+
+#define	MII_ANLPRNP	0x08	/* Autonegotiation link partner rx next page */
+		/* section 32.5.1 and 37.2.6.1 */
+
+			/* This is also the 1000baseT control register */
+#define	MII_100T2CR	0x09	/* 100base-T2 control register */
+#define	GTCR_TEST_MASK	0xe000	/* see 802.3ab ss. 40.6.1.1.2 */
+#define	GTCR_MAN_MS	0x1000	/* enable manual master/slave control */
+#define	GTCR_ADV_MS	0x0800	/* 1 = adv. master, 0 = adv. slave */
+#define	GTCR_PORT_TYPE	0x0400	/* 1 = DCE, 0 = DTE (NIC) */
+#define	GTCR_ADV_1000TFDX 0x0200 /* adv. 1000baseT FDX */
+#define	GTCR_ADV_1000THDX 0x0100 /* adv. 1000baseT HDX */
+
+			/* This is also the 1000baseT status register */
+#define	MII_100T2SR	0x0a	/* 100base-T2 status register */
+#define	GTSR_MAN_MS_FLT	0x8000	/* master/slave config fault */
+#define	GTSR_MS_RES	0x4000	/* result: 1 = master, 0 = slave */
+#define	GTSR_LRS	0x2000	/* local rx status, 1 = ok */
+#define	GTSR_RRS	0x1000	/* remove rx status, 1 = ok */
+#define	GTSR_LP_1000TFDX 0x0800	/* link partner 1000baseT FDX capable */
+#define	GTSR_LP_1000THDX 0x0400	/* link partner 1000baseT HDX capable */
+#define	GTSR_LP_ASM_DIR	0x0200	/* link partner asym. pause dir. capable */
+#define	GTSR_IDLE_ERR	0x00ff	/* IDLE error count */
+
+#define	MII_EXTSR	0x0f	/* Extended status register */
+#define	EXTSR_1000XFDX	0x8000	/* 1000X full-duplex capable */
+#define	EXTSR_1000XHDX	0x4000	/* 1000X half-duplex capable */
+#define	EXTSR_1000TFDX	0x2000	/* 1000T full-duplex capable */
+#define	EXTSR_1000THDX	0x1000	/* 1000T half-duplex capable */
+
+#define	EXTSR_MEDIAMASK	(EXTSR_1000XFDX|EXTSR_1000XHDX| \
+			 EXTSR_1000TFDX|EXTSR_1000THDX)
+
+#endif /* _DEV_MII_MII_H_ */

src/libs/compat/freebsd_network/compat/sys/bus.h

@@ -37,6 +37,9 @@ uint32_t bus_space_read_4(bus_space_tag_t tag, bus_space_handle_t handle,
 void bus_space_write_4(bus_space_tag_t tag, bus_space_handle_t handle,
 	bus_size_t offset, uint32_t value);
 
+#define bus_space_write_stream_4(t, h, o, v) \
+	bus_space_write_4((t), (h), (o), (v))
+
 
 #define BUS_SPACE_BARRIER_READ		1
 #define BUS_SPACE_BARRIER_WRITE		2

src/libs/compat/freebsd_network/compat/sys/haiku-module.h

@@ -81,8 +81,10 @@ extern const char gDriverName[];
 
 extern spinlock __haiku_intr_spinlock;
 extern int __haiku_disable_interrupts(device_t dev);
+extern void __haiku_reenable_interrupts(device_t dev);
 
 #define HAIKU_CHECK_DISABLE_INTERRUPTS		__haiku_disable_interrupts
+#define HAIKU_REENABLE_INTERRUPTS			__haiku_reenable_interrupts
 
 #define NO_HAIKU_CHECK_DISABLE_INTERRUPTS() \
 	int HAIKU_CHECK_DISABLE_INTERRUPTS(device_t dev) { \
@@ -90,6 +92,9 @@ extern int __haiku_disable_interrupts(device_t dev);
 		return -1; \
 	}
 
+#define NO_HAIKU_REENABLE_INTERRUPTS() \
+	void HAIKU_REENABLE_INTERRUPTS(device_t dev) {}
+
 extern int __haiku_driver_requirements;
 
 enum {
@@ -103,14 +108,24 @@ enum {
 
 #define HAIKU_DRIVER_REQUIRES(flag) (__haiku_driver_requirements & (flag))
 
-#define HAIKU_INTR_REGISTER_ENTER(status) do { \
+#define HAIKU_INTR_REGISTER_STATE \
-	status = disable_interrupts(); \
+	cpu_status __haiku_cpu_state = 0
-	acquire_spinlock(&__haiku_intr_spinlock); \
+
+#define HAIKU_INTR_REGISTER_ENTER() do {		\
+	__haiku_cpu_state = disable_interrupts();	\
+	acquire_spinlock(&__haiku_intr_spinlock);	\
 } while (0)
 
-#define HAIKU_INTR_REGISTER_LEAVE(status) do { \
+#define HAIKU_INTR_REGISTER_LEAVE() do {		\
-	release_spinlock(&__haiku_intr_spinlock); \
+	release_spinlock(&__haiku_intr_spinlock);	\
-	restore_interrupts(status); \
+	restore_interrupts(__haiku_cpu_state);		\
+} while (0)
+
+#define HAIKU_PROTECT_INTR_REGISTER(x) do {		\
+	HAIKU_INTR_REGISTER_STATE;					\
+	HAIKU_INTR_REGISTER_ENTER();				\
+	x;											\
+	HAIKU_INTR_REGISTER_LEAVE();				\
 } while (0)
 
 #define DEFINE_CLASS_0(name, driver, methods, size) \

src/libs/compat/freebsd_network/compat/sys/mbuf.h

@@ -103,6 +103,11 @@ u_int m_fixhdr(struct mbuf *m);
 void m_cat(struct mbuf *m, struct mbuf *n);
 void m_copydata(const struct mbuf *m, int off, int len, caddr_t cp);
 
+struct ifnet;
+struct mbuf *m_devget(char *, int, int, struct ifnet *,
+	void (*)(char *, caddr_t, u_int));
+void m_copyback(struct mbuf *, int, int, caddr_t);
+
 struct mbuf *m_get(int how, short type);
 struct mbuf *m_gethdr(int how, short type);
 void m_clget(struct mbuf *m, int how);
@@ -120,6 +125,7 @@ void m_clget(struct mbuf *m, int how);
 #define MBUF_CHECKSLEEP(how) do { } while (0)
 #define MBTOM(how) (how)
 
+extern int max_linkhdr;
 extern int max_protohdr;
 
 #include <sys/mbuf-fbsd.h>

src/libs/compat/freebsd_network/fbsd_mbuf.c

@@ -404,3 +404,119 @@ m_move_pkthdr(struct mbuf *to, struct mbuf *from)
 #endif
 	from->m_flags &= ~M_PKTHDR;
 }
+
+/*
+ * Routine to copy from device local memory into mbufs.
+ * Note that `off' argument is offset into first mbuf of target chain from
+ * which to begin copying the data to.
+ */
+struct mbuf *
+m_devget(char *buf, int totlen, int off, struct ifnet *ifp,
+	 void (*copy)(char *from, caddr_t to, u_int len))
+{
+	struct mbuf *m;
+	struct mbuf *top = NULL, **mp = ⊤
+	int len;
+
+	if (off < 0 || off > MHLEN)
+		return (NULL);
+
+	while (totlen > 0) {
+		if (top == NULL) {	/* First one, must be PKTHDR */
+			if (totlen + off >= MINCLSIZE) {
+				m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+				len = MCLBYTES;
+			} else {
+				m = m_gethdr(M_DONTWAIT, MT_DATA);
+				len = MHLEN;
+
+				/* Place initial small packet/header at end of mbuf */
+				if (m && totlen + off + max_linkhdr <= MLEN) {
+					m->m_data += max_linkhdr;
+					len -= max_linkhdr;
+				}
+			}
+			if (m == NULL)
+				return NULL;
+			m->m_pkthdr.rcvif = ifp;
+			m->m_pkthdr.len = totlen;
+		} else {
+			if (totlen + off >= MINCLSIZE) {
+				m = m_getcl(M_DONTWAIT, MT_DATA, 0);
+				len = MCLBYTES;
+			} else {
+				m = m_get(M_DONTWAIT, MT_DATA);
+				len = MLEN;
+			}
+			if (m == NULL) {
+				m_freem(top);
+				return NULL;
+			}
+		}
+		if (off) {
+			m->m_data += off;
+			len -= off;
+			off = 0;
+		}
+		m->m_len = len = min(totlen, len);
+		if (copy)
+			copy(buf, mtod(m, caddr_t), (u_int)len);
+		else
+			bcopy(buf, mtod(m, caddr_t), (u_int)len);
+		buf += len;
+		*mp = m;
+		mp = &m->m_next;
+		totlen -= len;
+	}
+	return (top);
+}
+
+/*
+ * Copy data from a buffer back into the indicated mbuf chain,
+ * starting "off" bytes from the beginning, extending the mbuf
+ * chain if necessary.
+ */
+void
+m_copyback(struct mbuf *m0, int off, int len, caddr_t cp)
+{
+	int mlen;
+	struct mbuf *m = m0, *n;
+	int totlen = 0;
+
+	if (m0 == NULL)
+		return;
+	while (off > (mlen = m->m_len)) {
+		off -= mlen;
+		totlen += mlen;
+		if (m->m_next == NULL) {
+			n = m_get(M_DONTWAIT, m->m_type);
+			if (n == NULL)
+				goto out;
+			bzero(mtod(n, caddr_t), MLEN);
+			n->m_len = min(MLEN, len + off);
+			m->m_next = n;
+		}
+		m = m->m_next;
+	}
+	while (len > 0) {
+		mlen = min (m->m_len - off, len);
+		bcopy(cp, off + mtod(m, caddr_t), (u_int)mlen);
+		cp += mlen;
+		len -= mlen;
+		mlen += off;
+		off = 0;
+		totlen += mlen;
+		if (len == 0)
+			break;
+		if (m->m_next == NULL) {
+			n = m_get(M_DONTWAIT, m->m_type);
+			if (n == NULL)
+				break;
+			n->m_len = min(MLEN, len);
+			m->m_next = n;
+		}
+		m = m->m_next;
+	}
+out:	if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
+		m->m_pkthdr.len = totlen;
+}

src/libs/compat/freebsd_network/mbuf.c

@@ -22,6 +22,7 @@
 static object_cache *sMBufCache;
 static object_cache *sChunkCache;
 
+int max_linkhdr = 16;
 int max_protohdr = 40 + 20; /* ip6 + tcp */