Add driver support for PCIe adapters based on JMicron JMC250

gigabit ethernet and JMC260 fast ethernet controllers. ATM jme(4)
supports all hardware features except RSS and multiple Tx/Rx queue.

In these days most ethernet controller vendors take a ply of
concealing hardware detailes from open source developers. As
contrasted with these vendors JMicron provided all necessary
information needed to write a stable driver during driver writing
and answered many questions I had. They even helped fixing driver
bugs with protocol analyzer. Many thanks to JMicron for their
support of FreeBSD.

H/W donated by:	JMicron

1 files changed, 3083 insertions, 0 deletions

diff --git a/sys/dev/jme/if_jme.c b/sys/dev/jme/if_jme.c
new file mode 100644
index 0000000..bbe0c6f
--- /dev/null
+++ b/sys/dev/jme/if_jme.c
@@ -0,0 +1,3083 @@
+/*-
+ * Copyright (c) 2008, Pyun YongHyeon <yongari@FreeBSD.org>
+ * All rights reserved.
+ *
+ * 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 unmodified, 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/endian.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/rman.h>
+#include <sys/module.h>
+#include <sys/proc.h>
+#include <sys/queue.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/sysctl.h>
+#include <sys/taskqueue.h>
+
+#include <net/bpf.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_types.h>
+#include <net/if_vlan_var.h>
+
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+
+#include <dev/mii/mii.h>
+#include <dev/mii/miivar.h>
+
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+
+#include <machine/atomic.h>
+#include <machine/bus.h>
+#include <machine/in_cksum.h>
+
+#include <dev/jme/if_jmereg.h>
+#include <dev/jme/if_jmevar.h>
+
+/* "device miibus" required.  See GENERIC if you get errors here. */
+#include "miibus_if.h"
+
+/* Define the following to disable printing Rx errors. */
+#undef	JME_SHOW_ERRORS
+
+#define	JME_CSUM_FEATURES	(CSUM_IP | CSUM_TCP | CSUM_UDP)
+
+MODULE_DEPEND(jme, pci, 1, 1, 1);
+MODULE_DEPEND(jme, ether, 1, 1, 1);
+MODULE_DEPEND(jme, miibus, 1, 1, 1);
+
+/* Tunables. */
+static int msi_disable = 0;
+static int msix_disable = 0;
+TUNABLE_INT("hw.jme.msi_disable", &msi_disable);
+TUNABLE_INT("hw.jme.msix_disable", &msix_disable);
+
+/*
+ * Devices supported by this driver.
+ */
+static struct jme_dev {
+	uint16_t	jme_vendorid;
+	uint16_t	jme_deviceid;
+	const char	*jme_name;
+} jme_devs[] = {
+	{ VENDORID_JMICRON, DEVICEID_JMC250,
+	    "JMicron Inc, JMC250 Gigabit Ethernet" },
+	{ VENDORID_JMICRON, DEVICEID_JMC260,
+	    "JMicron Inc, JMC260 Fast Ethernet" },
+};
+
+static int jme_miibus_readreg(device_t, int, int);
+static int jme_miibus_writereg(device_t, int, int, int);
+static void jme_miibus_statchg(device_t);
+static void jme_mediastatus(struct ifnet *, struct ifmediareq *);
+static int jme_mediachange(struct ifnet *);
+static int jme_probe(device_t);
+static int jme_eeprom_read_byte(struct jme_softc *, uint8_t, uint8_t *);
+static int jme_eeprom_macaddr(struct jme_softc *);
+static void jme_reg_macaddr(struct jme_softc *);
+static void jme_map_intr_vector(struct jme_softc *);
+static int jme_attach(device_t);
+static int jme_detach(device_t);
+static void jme_sysctl_node(struct jme_softc *);
+static void jme_dmamap_cb(void *, bus_dma_segment_t *, int, int);
+static int jme_dma_alloc(struct jme_softc *);
+static void jme_dma_free(struct jme_softc *);
+static int jme_shutdown(device_t);
+static void jme_setlinkspeed(struct jme_softc *);
+static void jme_setwol(struct jme_softc *);
+static int jme_suspend(device_t);
+static int jme_resume(device_t);
+static int jme_encap(struct jme_softc *, struct mbuf **);
+static void jme_tx_task(void *, int);
+static void jme_start(struct ifnet *);
+static void jme_watchdog(struct jme_softc *);
+static int jme_ioctl(struct ifnet *, u_long, caddr_t);
+static void jme_mac_config(struct jme_softc *);
+static void jme_link_task(void *, int);
+static int jme_intr(void *);
+static void jme_int_task(void *, int);
+static void jme_txeof(struct jme_softc *);
+static __inline void jme_discard_rxbuf(struct jme_softc *, int);
+static void jme_rxeof(struct jme_softc *);
+static int jme_rxintr(struct jme_softc *, int);
+static void jme_tick(void *);
+static void jme_reset(struct jme_softc *);
+static void jme_init(void *);
+static void jme_init_locked(struct jme_softc *);
+static void jme_stop(struct jme_softc *);
+static void jme_stop_tx(struct jme_softc *);
+static void jme_stop_rx(struct jme_softc *);
+static int jme_init_rx_ring(struct jme_softc *);
+static void jme_init_tx_ring(struct jme_softc *);
+static void jme_init_ssb(struct jme_softc *);
+static int jme_newbuf(struct jme_softc *, struct jme_rxdesc *);
+static void jme_set_vlan(struct jme_softc *);
+static void jme_set_filter(struct jme_softc *);
+static int sysctl_int_range(SYSCTL_HANDLER_ARGS, int, int);
+static int sysctl_hw_jme_tx_coal_to(SYSCTL_HANDLER_ARGS);
+static int sysctl_hw_jme_tx_coal_pkt(SYSCTL_HANDLER_ARGS);
+static int sysctl_hw_jme_rx_coal_to(SYSCTL_HANDLER_ARGS);
+static int sysctl_hw_jme_rx_coal_pkt(SYSCTL_HANDLER_ARGS);
+static int sysctl_hw_jme_proc_limit(SYSCTL_HANDLER_ARGS);
+
+
+static device_method_t jme_methods[] = {
+	/* Device interface. */
+	DEVMETHOD(device_probe,		jme_probe),
+	DEVMETHOD(device_attach,	jme_attach),
+	DEVMETHOD(device_detach,	jme_detach),
+	DEVMETHOD(device_shutdown,	jme_shutdown),
+	DEVMETHOD(device_suspend,	jme_suspend),
+	DEVMETHOD(device_resume,	jme_resume),
+
+	/* MII interface. */
+	DEVMETHOD(miibus_readreg,	jme_miibus_readreg),
+	DEVMETHOD(miibus_writereg,	jme_miibus_writereg),
+	DEVMETHOD(miibus_statchg,	jme_miibus_statchg),
+
+	{ NULL, NULL }
+};
+
+static driver_t jme_driver = {
+	"jme",
+	jme_methods,
+	sizeof(struct jme_softc)
+};
+
+static devclass_t jme_devclass;
+
+DRIVER_MODULE(jme, pci, jme_driver, jme_devclass, 0, 0);
+DRIVER_MODULE(miibus, jme, miibus_driver, miibus_devclass, 0, 0);
+
+static struct resource_spec jme_res_spec_mem[] = {
+	{ SYS_RES_MEMORY,	PCIR_BAR(0),	RF_ACTIVE },
+	{ -1,			0,		0 }
+};
+
+static struct resource_spec jme_irq_spec_legacy[] = {
+	{ SYS_RES_IRQ,		0,		RF_ACTIVE | RF_SHAREABLE },
+	{ -1,			0,		0 }
+};
+
+static struct resource_spec jme_irq_spec_msi[] = {
+	{ SYS_RES_IRQ,		1,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		2,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		3,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		4,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		5,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		6,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		7,		RF_ACTIVE },
+	{ SYS_RES_IRQ,		8,		RF_ACTIVE },
+	{ -1,			0,		0 }
+};
+
+/*
+ *	Read a PHY register on the MII of the JMC250.
+ */
+static int
+jme_miibus_readreg(device_t dev, int phy, int reg)
+{
+	struct jme_softc *sc;
+	uint32_t val;
+	int i;
+
+	sc = device_get_softc(dev);
+
+	/* For FPGA version, PHY address 0 should be ignored. */
+	if ((sc->jme_flags & JME_FLAG_FPGA) != 0) {
+		if (phy == 0)
+			return (0);
+	} else {
+		if (sc->jme_phyaddr != phy)
+			return (0);
+	}
+
+	CSR_WRITE_4(sc, JME_SMI, SMI_OP_READ | SMI_OP_EXECUTE |
+	    SMI_PHY_ADDR(phy) | SMI_REG_ADDR(reg));
+	for (i = JME_PHY_TIMEOUT; i > 0; i--) {
+		DELAY(1);
+		if (((val = CSR_READ_4(sc, JME_SMI)) & SMI_OP_EXECUTE) == 0)
+			break;
+	}
+
+	if (i == 0) {
+		device_printf(sc->jme_dev, "phy read timeout : %d\n", reg);
+		return (0);
+	}
+
+	return ((val & SMI_DATA_MASK) >> SMI_DATA_SHIFT);
+}
+
+/*
+ *	Write a PHY register on the MII of the JMC250.
+ */
+static int
+jme_miibus_writereg(device_t dev, int phy, int reg, int val)
+{
+	struct jme_softc *sc;
+	int i;
+
+	sc = device_get_softc(dev);
+
+	/* For FPGA version, PHY address 0 should be ignored. */
+	if ((sc->jme_flags & JME_FLAG_FPGA) != 0) {
+		if (phy == 0)
+			return (0);
+	} else {
+		if (sc->jme_phyaddr != phy)
+			return (0);
+	}
+
+	CSR_WRITE_4(sc, JME_SMI, SMI_OP_WRITE | SMI_OP_EXECUTE |
+	    ((val << SMI_DATA_SHIFT) & SMI_DATA_MASK) |
+	    SMI_PHY_ADDR(phy) | SMI_REG_ADDR(reg));
+	for (i = JME_PHY_TIMEOUT; i > 0; i--) {
+		DELAY(1);
+		if (((val = CSR_READ_4(sc, JME_SMI)) & SMI_OP_EXECUTE) == 0)
+			break;
+	}
+
+	if (i == 0)
+		device_printf(sc->jme_dev, "phy write timeout : %d\n", reg);
+
+	return (0);
+}
+
+/*
+ *	Callback from MII layer when media changes.
+ */
+static void
+jme_miibus_statchg(device_t dev)
+{
+	struct jme_softc *sc;
+
+	sc = device_get_softc(dev);
+	taskqueue_enqueue(taskqueue_swi, &sc->jme_link_task);
+}
+
+/*
+ *	Get the current interface media status.
+ */
+static void
+jme_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr)
+{
+	struct jme_softc *sc;
+	struct mii_data *mii;
+
+	sc = ifp->if_softc;
+	JME_LOCK(sc);
+	mii = device_get_softc(sc->jme_miibus);
+
+	mii_pollstat(mii);
+	ifmr->ifm_status = mii->mii_media_status;
+	ifmr->ifm_active = mii->mii_media_active;
+	JME_UNLOCK(sc);
+}
+
+/*
+ *	Set hardware to newly-selected media.
+ */
+static int
+jme_mediachange(struct ifnet *ifp)
+{
+	struct jme_softc *sc;
+	struct mii_data *mii;
+	struct mii_softc *miisc;
+	int error;
+
+	sc = ifp->if_softc;
+	JME_LOCK(sc);
+	mii = device_get_softc(sc->jme_miibus);
+	if (mii->mii_instance != 0) {
+		LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
+			mii_phy_reset(miisc);
+	}
+	error = mii_mediachg(mii);
+	JME_UNLOCK(sc);
+
+	return (error);
+}
+
+static int
+jme_probe(device_t dev)
+{
+	struct jme_dev *sp;
+	int i;
+	uint16_t vendor, devid;
+
+	vendor = pci_get_vendor(dev);
+	devid = pci_get_device(dev);
+	sp = jme_devs;
+	for (i = 0; i < sizeof(jme_devs) / sizeof(jme_devs[0]);
+	    i++, sp++) {
+		if (vendor == sp->jme_vendorid &&
+		    devid == sp->jme_deviceid) {
+			device_set_desc(dev, sp->jme_name);
+			return (BUS_PROBE_DEFAULT);
+		}
+	}
+
+	return (ENXIO);
+}
+
+static int
+jme_eeprom_read_byte(struct jme_softc *sc, uint8_t addr, uint8_t *val)
+{
+	uint32_t reg;
+	int i;
+
+	*val = 0;
+	for (i = JME_TIMEOUT; i > 0; i--) {
+		reg = CSR_READ_4(sc, JME_SMBCSR);
+		if ((reg & SMBCSR_HW_BUSY_MASK) == SMBCSR_HW_IDLE)
+			break;
+		DELAY(1);
+	}
+
+	if (i == 0) {
+		device_printf(sc->jme_dev, "EEPROM idle timeout!\n");
+		return (ETIMEDOUT);
+	}
+
+	reg = ((uint32_t)addr << SMBINTF_ADDR_SHIFT) & SMBINTF_ADDR_MASK;
+	CSR_WRITE_4(sc, JME_SMBINTF, reg | SMBINTF_RD | SMBINTF_CMD_TRIGGER);
+	for (i = JME_TIMEOUT; i > 0; i--) {
+		DELAY(1);
+		reg = CSR_READ_4(sc, JME_SMBINTF);
+		if ((reg & SMBINTF_CMD_TRIGGER) == 0)
+			break;
+	}
+
+	if (i == 0) {
+		device_printf(sc->jme_dev, "EEPROM read timeout!\n");
+		return (ETIMEDOUT);
+	}
+
+	reg = CSR_READ_4(sc, JME_SMBINTF);
+	*val = (reg & SMBINTF_RD_DATA_MASK) >> SMBINTF_RD_DATA_SHIFT;
+
+	return (0);
+}
+
+static int
+jme_eeprom_macaddr(struct jme_softc *sc)
+{
+	uint8_t eaddr[ETHER_ADDR_LEN];
+	uint8_t fup, reg, val;
+	uint32_t offset;
+	int match;
+
+	offset = 0;
+	if (jme_eeprom_read_byte(sc, offset++, &fup) != 0 ||
+	    fup != JME_EEPROM_SIG0)
+		return (ENOENT);
+	if (jme_eeprom_read_byte(sc, offset++, &fup) != 0 ||
+	    fup != JME_EEPROM_SIG1)
+		return (ENOENT);
+	match = 0;
+	do {
+		if (jme_eeprom_read_byte(sc, offset, &fup) != 0)
+			break;
+		/* Check for the end of EEPROM descriptor. */
+		if ((fup & JME_EEPROM_DESC_END) == JME_EEPROM_DESC_END)
+			break;
+		if ((uint8_t)JME_EEPROM_MKDESC(JME_EEPROM_FUNC0,
+		    JME_EEPROM_PAGE_BAR1) == fup) {
+			if (jme_eeprom_read_byte(sc, offset + 1, &reg) != 0)
+				break;
+			if (reg >= JME_PAR0 &&
+			    reg < JME_PAR0 + ETHER_ADDR_LEN) {
+				if (jme_eeprom_read_byte(sc, offset + 2,
+				    &val) != 0)
+					break;
+				eaddr[reg - JME_PAR0] = val;
+				match++;
+			}
+		}
+		/* Try next eeprom descriptor. */
+		offset += JME_EEPROM_DESC_BYTES;
+	} while (match != ETHER_ADDR_LEN && offset < JME_EEPROM_END);
+
+	if (match == ETHER_ADDR_LEN) {
+		bcopy(eaddr, sc->jme_eaddr, ETHER_ADDR_LEN);
+		return (0);
+	}
+
+	return (ENOENT);
+}
+
+static void
+jme_reg_macaddr(struct jme_softc *sc)
+{
+	uint32_t par0, par1;
+
+	/* Read station address. */
+	par0 = CSR_READ_4(sc, JME_PAR0);
+	par1 = CSR_READ_4(sc, JME_PAR1);
+	par1 &= 0xFFFF;
+	if ((par0 == 0 && par1 == 0) ||
+	    (par0 == 0xFFFFFFFF && par1 == 0xFFFF)) {
+		device_printf(sc->jme_dev,
+		    "generating fake ethernet address.\n");
+		par0 = arc4random();
+		/* Set OUI to JMicron. */
+		sc->jme_eaddr[0] = 0x00;
+		sc->jme_eaddr[1] = 0x1B;
+		sc->jme_eaddr[2] = 0x8C;
+		sc->jme_eaddr[3] = (par0 >> 16) & 0xff;
+		sc->jme_eaddr[4] = (par0 >> 8) & 0xff;
+		sc->jme_eaddr[5] = par0 & 0xff;
+	} else {
+		sc->jme_eaddr[0] = (par0 >> 0) & 0xFF;
+		sc->jme_eaddr[1] = (par0 >> 8) & 0xFF;
+		sc->jme_eaddr[2] = (par0 >> 16) & 0xFF;
+		sc->jme_eaddr[3] = (par0 >> 24) & 0xFF;
+		sc->jme_eaddr[4] = (par1 >> 0) & 0xFF;
+		sc->jme_eaddr[5] = (par1 >> 8) & 0xFF;
+	}
+}
+
+static void
+jme_map_intr_vector(struct jme_softc *sc)
+{
+	uint32_t map[MSINUM_NUM_INTR_SOURCE / JME_MSI_MESSAGES];
+
+	bzero(map, sizeof(map));
+
+	/* Map Tx interrupts source to MSI/MSIX vector 2. */
+	map[MSINUM_REG_INDEX(N_INTR_TXQ0_COMP)] =
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ0_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ1_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ1_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ2_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ2_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ3_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ3_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ4_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ4_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ4_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ5_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ6_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ6_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ7_COMP)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ7_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ_COAL)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ_COAL);
+	map[MSINUM_REG_INDEX(N_INTR_TXQ_COAL_TO)] |=
+	    MSINUM_INTR_SOURCE(2, N_INTR_TXQ_COAL_TO);
+
+	/* Map Rx interrupts source to MSI/MSIX vector 1. */
+	map[MSINUM_REG_INDEX(N_INTR_RXQ0_COMP)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ0_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ1_COMP)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ1_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ2_COMP)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ2_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ3_COMP)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ3_COMP);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ0_DESC_EMPTY)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ0_DESC_EMPTY);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ1_DESC_EMPTY)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ1_DESC_EMPTY);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ2_DESC_EMPTY)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ2_DESC_EMPTY);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ3_DESC_EMPTY)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ3_DESC_EMPTY);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ0_COAL)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ0_COAL);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ1_COAL)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ1_COAL);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ2_COAL)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ2_COAL);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ3_COAL)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ3_COAL);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ0_COAL_TO)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ0_COAL_TO);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ1_COAL_TO)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ1_COAL_TO);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ2_COAL_TO)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ2_COAL_TO);
+	map[MSINUM_REG_INDEX(N_INTR_RXQ3_COAL_TO)] =
+	    MSINUM_INTR_SOURCE(1, N_INTR_RXQ3_COAL_TO);
+
+	/* Map all other interrupts source to MSI/MSIX vector 0. */
+	CSR_WRITE_4(sc, JME_MSINUM_BASE + sizeof(uint32_t) * 0, map[0]);
+	CSR_WRITE_4(sc, JME_MSINUM_BASE + sizeof(uint32_t) * 1, map[1]);
+	CSR_WRITE_4(sc, JME_MSINUM_BASE + sizeof(uint32_t) * 2, map[2]);
+	CSR_WRITE_4(sc, JME_MSINUM_BASE + sizeof(uint32_t) * 3, map[3]);
+}
+
+static int
+jme_attach(device_t dev)
+{
+	struct jme_softc *sc;
+	struct ifnet *ifp;
+	struct mii_softc *miisc;
+	struct mii_data *mii;
+	uint32_t reg;
+	uint16_t burst;
+	int error, i, msic, msixc, pmc;
+
+	error = 0;
+	sc = device_get_softc(dev);
+	sc->jme_dev = dev;
+
+	mtx_init(&sc->jme_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
+	    MTX_DEF);
+	callout_init_mtx(&sc->jme_tick_ch, &sc->jme_mtx, 0);
+	TASK_INIT(&sc->jme_int_task, 0, jme_int_task, sc);
+	TASK_INIT(&sc->jme_link_task, 0, jme_link_task, sc);
+
+	/*
+	 * Map the device. JMC250 supports both memory mapped and I/O
+	 * register space access. Because I/O register access should
+	 * use different BARs to access registers it's waste of time
+	 * to use I/O register spce access. JMC250 uses 16K to map
+	 * entire memory space.
+	 */
+	pci_enable_busmaster(dev);
+	sc->jme_res_spec = jme_res_spec_mem;
+	sc->jme_irq_spec = jme_irq_spec_legacy;
+	error = bus_alloc_resources(dev, sc->jme_res_spec, sc->jme_res);
+	if (error != 0) {
+		device_printf(dev, "cannot allocate memory resources.\n");
+		goto fail;
+	}
+
+	/* Allocate IRQ resources. */
+	msixc = pci_msix_count(dev);
+	msic = pci_msi_count(dev);
+	if (bootverbose) {
+		device_printf(dev, "MSIX count : %d\n", msixc);
+		device_printf(dev, "MSI count : %d\n", msic);
+	}
+
+	/* Prefer MSIX over MSI. */
+	if (msix_disable == 0 || msi_disable == 0) {
+		if (msix_disable == 0 && msixc == JME_MSIX_MESSAGES &&
+		    pci_alloc_msix(dev, &msixc) == 0) {
+			if (msic == JME_MSIX_MESSAGES) {
+				device_printf(dev, "Using %d MSIX messages.\n",
+				    msixc);
+				sc->jme_flags |= JME_FLAG_MSIX;
+				sc->jme_irq_spec = jme_irq_spec_msi;
+			} else
+				pci_release_msi(dev);
+		}
+		if (msi_disable == 0 && (sc->jme_flags & JME_FLAG_MSIX) == 0 &&
+		    msic == JME_MSI_MESSAGES &&
+		    pci_alloc_msi(dev, &msic) == 0) {
+			if (msic == JME_MSI_MESSAGES) {
+				device_printf(dev, "Using %d MSI messages.\n",
+				    msic);
+				sc->jme_flags |= JME_FLAG_MSI;
+				sc->jme_irq_spec = jme_irq_spec_msi;
+			} else
+				pci_release_msi(dev);
+		}
+		/* Map interrupt vector 0, 1 and 2. */
+		if ((sc->jme_flags & JME_FLAG_MSI) != 0 ||
+		    (sc->jme_flags & JME_FLAG_MSIX) != 0)
+			jme_map_intr_vector(sc);
+	}
+
+	error = bus_alloc_resources(dev, sc->jme_irq_spec, sc->jme_irq);
+	if (error != 0) {
+		device_printf(dev, "cannot allocate IRQ resources.\n");
+		goto fail;
+	}
+
+	sc->jme_rev = pci_get_revid(dev);
+	if (sc->jme_rev == DEVICEREVID_JMC260) {
+		sc->jme_flags |= JME_FLAG_FASTETH;
+		sc->jme_flags |= JME_FLAG_NOJUMBO;
+	}
+	reg = CSR_READ_4(sc, JME_CHIPMODE);
+	sc->jme_chip_rev = (reg & CHIPMODE_REV_MASK) >> CHIPMODE_REV_SHIFT;
+	if (((reg & CHIPMODE_FPGA_REV_MASK) >> CHIPMODE_FPGA_REV_SHIFT) !=
+	    CHIPMODE_NOT_FPGA)
+		sc->jme_flags |= JME_FLAG_FPGA;
+	if (bootverbose) {
+		device_printf(dev, "PCI device revision : 0x%04x\n",
+		    sc->jme_rev);
+		device_printf(dev, "Chip revision : 0x%02x\n",
+		    sc->jme_chip_rev);
+		if ((sc->jme_flags & JME_FLAG_FPGA) != 0)
+			device_printf(dev, "FPGA revision : 0x%04x\n",
+			    (reg & CHIPMODE_FPGA_REV_MASK) >>
+			    CHIPMODE_FPGA_REV_SHIFT);
+	}
+	if (sc->jme_chip_rev == 0xFF) {
+		device_printf(dev, "Unknown chip revision : 0x%02x\n",
+		    sc->jme_rev);
+		error = ENXIO;
+		goto fail;
+	}
+
+	/* Reset the ethernet controller. */
+	jme_reset(sc);
+
+	/* Get station address. */
+	reg = CSR_READ_4(sc, JME_SMBCSR);
+	if ((reg & SMBCSR_EEPROM_PRESENT) != 0)
+		error = jme_eeprom_macaddr(sc);
+	if (error != 0 || (reg & SMBCSR_EEPROM_PRESENT) == 0) {
+		if (error != 0 && (bootverbose))
+			device_printf(sc->jme_dev,
+			    "ethernet hardware address not found in EEPROM.\n");
+		jme_reg_macaddr(sc);
+	}
+
+	/*
+	 * Save PHY address.
+	 * Integrated JR0211 has fixed PHY address whereas FPGA version
+	 * requires PHY probing to get correct PHY address.
+	 */
+	if ((sc->jme_flags & JME_FLAG_FPGA) == 0) {
+		sc->jme_phyaddr = CSR_READ_4(sc, JME_GPREG0) &
+		    GPREG0_PHY_ADDR_MASK;
+		if (bootverbose)
+			device_printf(dev, "PHY is at address %d.\n",
+			    sc->jme_phyaddr);
+	} else
+		sc->jme_phyaddr = 0;
+
+	/* Set max allowable DMA size. */
+	if (pci_find_extcap(dev, PCIY_EXPRESS, &i) == 0) {
+		sc->jme_flags |= JME_FLAG_PCIE;
+		burst = pci_read_config(dev, i + 0x08, 2);
+		if (bootverbose) {
+			device_printf(dev, "Read request size : %d bytes.\n",
+			    128 << ((burst >> 12) & 0x07));
+			device_printf(dev, "TLP payload size : %d bytes.\n",
+			    128 << ((burst >> 5) & 0x07));
+		}
+		switch ((burst >> 12) & 0x07) {
+		case 0:
+			sc->jme_tx_dma_size = TXCSR_DMA_SIZE_128;
+			break;
+		case 1:
+			sc->jme_tx_dma_size = TXCSR_DMA_SIZE_256;
+			break;
+		default:
+			sc->jme_tx_dma_size = TXCSR_DMA_SIZE_512;
+			break;
+		}
+		sc->jme_rx_dma_size = RXCSR_DMA_SIZE_128;
+	} else {
+		sc->jme_tx_dma_size = TXCSR_DMA_SIZE_512;
+		sc->jme_rx_dma_size = RXCSR_DMA_SIZE_128;
+	}
+	/* Create coalescing sysctl node. */
+	jme_sysctl_node(sc);
+	if ((error = jme_dma_alloc(sc) != 0))
+		goto fail;
+
+	ifp = sc->jme_ifp = if_alloc(IFT_ETHER);
+	if (ifp == NULL) {
+		device_printf(dev, "cannot allocate ifnet structure.\n");
+		error = ENXIO;
+		goto fail;
+	}
+
+	ifp->if_softc = sc;
+	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = jme_ioctl;
+	ifp->if_start = jme_start;
+	ifp->if_init = jme_init;
+	ifp->if_snd.ifq_drv_maxlen = JME_TX_RING_CNT - 1;
+	IFQ_SET_MAXLEN(&ifp->if_snd, ifp->if_snd.ifq_drv_maxlen);
+	IFQ_SET_READY(&ifp->if_snd);
+	/* JMC250 supports Tx/Rx checksum offload as well as TSO. */
+	ifp->if_capabilities = IFCAP_HWCSUM | IFCAP_TSO4;
+	ifp->if_hwassist = JME_CSUM_FEATURES | CSUM_TSO;
+	if (pci_find_extcap(dev, PCIY_PMG, &pmc) == 0) {
+		sc->jme_flags |= JME_FLAG_PMCAP;
+		ifp->if_capabilities |= IFCAP_WOL_MAGIC;
+	}
+	ifp->if_capenable = ifp->if_capabilities;
+
+	/* Set up MII bus. */
+	if ((error = mii_phy_probe(dev, &sc->jme_miibus, jme_mediachange,
+	    jme_mediastatus)) != 0) {
+		device_printf(dev, "no PHY found!\n");
+		goto fail;
+	}
+
+	/*
+	 * Force PHY to FPGA mode.
+	 */
+	if ((sc->jme_flags & JME_FLAG_FPGA) != 0) {
+		mii = device_get_softc(sc->jme_miibus);
+		if (mii->mii_instance != 0) {
+			LIST_FOREACH(miisc, &mii->mii_phys, mii_list) {
+				if (miisc->mii_phy != 0) {
+					sc->jme_phyaddr = miisc->mii_phy;
+					break;
+				}
+			}
+			if (sc->jme_phyaddr != 0) {
+				device_printf(sc->jme_dev,
+				    "FPGA PHY is at %d\n", sc->jme_phyaddr);
+				/* vendor magic. */
+				jme_miibus_writereg(dev, sc->jme_phyaddr, 27,
+				    0x0004);
+			}
+		}
+	}
+
+	ether_ifattach(ifp, sc->jme_eaddr);
+
+	/* VLAN capability setup */
+	ifp->if_capabilities |= IFCAP_VLAN_MTU | IFCAP_VLAN_HWTAGGING |
+	    IFCAP_VLAN_HWCSUM;
+	ifp->if_capenable = ifp->if_capabilities;
+
+	/* Tell the upper layer(s) we support long frames. */
+	ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
+
+	/* Create local taskq. */
+	TASK_INIT(&sc->jme_tx_task, 1, jme_tx_task, ifp);
+	sc->jme_tq = taskqueue_create_fast("jme_taskq", M_WAITOK,
+	    taskqueue_thread_enqueue, &sc->jme_tq);
+	if (sc->jme_tq == NULL) {
+		device_printf(dev, "could not create taskqueue.\n");
+		ether_ifdetach(ifp);
+		error = ENXIO;
+		goto fail;
+	}
+	taskqueue_start_threads(&sc->jme_tq, 1, PI_NET, "%s taskq",
+	    device_get_nameunit(sc->jme_dev));
+
+	if ((sc->jme_flags & JME_FLAG_MSIX) != 0)
+		msic = JME_MSIX_MESSAGES;
+	else if ((sc->jme_flags & JME_FLAG_MSI) != 0)
+		msic = JME_MSI_MESSAGES;
+	else
+		msic = 1;
+	for (i = 0; i < msic; i++) {
+		error = bus_setup_intr(dev, sc->jme_irq[i],
+		    INTR_TYPE_NET | INTR_MPSAFE, jme_intr, NULL, sc,
+		    &sc->jme_intrhand[i]);
+		if (error != 0)
+			break;
+	}
+
+	if (error != 0) {
+		device_printf(dev, "could not set up interrupt handler.\n");
+		taskqueue_free(sc->jme_tq);
+		sc->jme_tq = NULL;
+		ether_ifdetach(ifp);
+		goto fail;
+	}
+
+fail:
+	if (error != 0)
+		jme_detach(dev);
+
+	return (error);
+}
+
+static int
+jme_detach(device_t dev)
+{
+	struct jme_softc *sc;
+	struct ifnet *ifp;
+	int i, msic;
+
+	sc = device_get_softc(dev);
+
+	ifp = sc->jme_ifp;
+	if (device_is_attached(dev)) {
+		JME_LOCK(sc);
+		sc->jme_flags |= JME_FLAG_DETACH;
+		jme_stop(sc);
+		JME_UNLOCK(sc);
+		callout_drain(&sc->jme_tick_ch);
+		taskqueue_drain(sc->jme_tq, &sc->jme_int_task);
+		taskqueue_drain(sc->jme_tq, &sc->jme_tx_task);
+		taskqueue_drain(taskqueue_swi, &sc->jme_link_task);
+		ether_ifdetach(ifp);
+	}
+
+	if (sc->jme_tq != NULL) {
+		taskqueue_drain(sc->jme_tq, &sc->jme_int_task);
+		taskqueue_free(sc->jme_tq);
+		sc->jme_tq = NULL;
+	}
+
+	if (sc->jme_miibus != NULL) {
+		device_delete_child(dev, sc->jme_miibus);
+		sc->jme_miibus = NULL;
+	}
+	bus_generic_detach(dev);
+	jme_dma_free(sc);
+
+	if (ifp != NULL) {
+		if_free(ifp);
+		sc->jme_ifp = NULL;
+	}
+
+	msic = 1;
+	if ((sc->jme_flags & JME_FLAG_MSIX) != 0)
+		msic = JME_MSIX_MESSAGES;
+	else if ((sc->jme_flags & JME_FLAG_MSI) != 0)
+		msic = JME_MSI_MESSAGES;
+	else
+		msic = 1;
+	for (i = 0; i < msic; i++) {
+		if (sc->jme_intrhand[i] != NULL) {
+			bus_teardown_intr(dev, sc->jme_irq[i],
+			    sc->jme_intrhand[i]);
+			sc->jme_intrhand[i] = NULL;
+		}
+	}
+
+	bus_release_resources(dev, sc->jme_irq_spec, sc->jme_irq);
+	if ((sc->jme_flags & (JME_FLAG_MSIX | JME_FLAG_MSI)) != 0)
+		pci_release_msi(dev);
+	bus_release_resources(dev, sc->jme_res_spec, sc->jme_res);
+	mtx_destroy(&sc->jme_mtx);
+
+	return (0);
+}
+
+static void
+jme_sysctl_node(struct jme_softc *sc)
+{
+	int error;
+
+	SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->jme_dev),
+	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->jme_dev)), OID_AUTO,
+	    "tx_coal_to", CTLTYPE_INT | CTLFLAG_RW, &sc->jme_tx_coal_to,
+	    0, sysctl_hw_jme_tx_coal_to, "I", "jme tx coalescing timeout");
+
+	SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->jme_dev),
+	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->jme_dev)), OID_AUTO,
+	    "tx_coal_pkt", CTLTYPE_INT | CTLFLAG_RW, &sc->jme_tx_coal_pkt,
+	    0, sysctl_hw_jme_tx_coal_pkt, "I", "jme tx coalescing packet");
+
+	SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->jme_dev),
+	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->jme_dev)), OID_AUTO,
+	    "rx_coal_to", CTLTYPE_INT | CTLFLAG_RW, &sc->jme_rx_coal_to,
+	    0, sysctl_hw_jme_rx_coal_to, "I", "jme rx coalescing timeout");
+
+	SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->jme_dev),
+	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->jme_dev)), OID_AUTO,
+	    "rx_coal_pkt", CTLTYPE_INT | CTLFLAG_RW, &sc->jme_rx_coal_pkt,
+	    0, sysctl_hw_jme_rx_coal_pkt, "I", "jme rx coalescing packet");
+
+	SYSCTL_ADD_PROC(device_get_sysctl_ctx(sc->jme_dev),
+	    SYSCTL_CHILDREN(device_get_sysctl_tree(sc->jme_dev)), OID_AUTO,
+	    "process_limit", CTLTYPE_INT | CTLFLAG_RW, &sc->jme_process_limit,
+	    0, sysctl_hw_jme_proc_limit, "I",
+	    "max number of Rx events to process");
+
+	/* Pull in device tunables. */
+	sc->jme_process_limit = JME_PROC_DEFAULT;
+	error = resource_int_value(device_get_name(sc->jme_dev),
+	    device_get_unit(sc->jme_dev), "process_limit",
+	    &sc->jme_process_limit);
+	if (error == 0) {
+		if (sc->jme_process_limit < JME_PROC_MIN ||
+		    sc->jme_process_limit > JME_PROC_MAX) {
+			device_printf(sc->jme_dev,
+			    "process_limit value out of range; "
+			    "using default: %d\n", JME_PROC_DEFAULT);
+			sc->jme_process_limit = JME_PROC_DEFAULT;
+		}
+	}
+
+	sc->jme_tx_coal_to = PCCTX_COAL_TO_DEFAULT;
+	error = resource_int_value(device_get_name(sc->jme_dev),
+	    device_get_unit(sc->jme_dev), "tx_coal_to", &sc->jme_tx_coal_to);
+	if (error == 0) {
+		if (sc->jme_tx_coal_to < PCCTX_COAL_TO_MIN ||
+		    sc->jme_tx_coal_to > PCCTX_COAL_TO_MAX) {
+			device_printf(sc->jme_dev,
+			    "tx_coal_to value out of range; "
+			    "using default: %d\n", PCCTX_COAL_TO_DEFAULT);
+			sc->jme_tx_coal_to = PCCTX_COAL_TO_DEFAULT;
+		}
+	}
+
+	sc->jme_tx_coal_pkt = PCCTX_COAL_PKT_DEFAULT;
+	error = resource_int_value(device_get_name(sc->jme_dev),
+	    device_get_unit(sc->jme_dev), "tx_coal_pkt", &sc->jme_tx_coal_to);
+	if (error == 0) {
+		if (sc->jme_tx_coal_pkt < PCCTX_COAL_PKT_MIN ||
+		    sc->jme_tx_coal_pkt > PCCTX_COAL_PKT_MAX) {
+			device_printf(sc->jme_dev,
+			    "tx_coal_pkt value out of range; "
+			    "using default: %d\n", PCCTX_COAL_PKT_DEFAULT);
+			sc->jme_tx_coal_pkt = PCCTX_COAL_PKT_DEFAULT;
+		}
+	}
+
+	sc->jme_rx_coal_to = PCCRX_COAL_TO_DEFAULT;
+	error = resource_int_value(device_get_name(sc->jme_dev),
+	    device_get_unit(sc->jme_dev), "rx_coal_to", &sc->jme_rx_coal_to);
+	if (error == 0) {
+		if (sc->jme_rx_coal_to < PCCRX_COAL_TO_MIN ||
+		    sc->jme_rx_coal_to > PCCRX_COAL_TO_MAX) {
+			device_printf(sc->jme_dev,
+			    "rx_coal_to value out of range; "
+			    "using default: %d\n", PCCRX_COAL_TO_DEFAULT);
+			sc->jme_rx_coal_to = PCCRX_COAL_TO_DEFAULT;
+		}
+	}
+
+	sc->jme_rx_coal_pkt = PCCRX_COAL_PKT_DEFAULT;
+	error = resource_int_value(device_get_name(sc->jme_dev),
+	    device_get_unit(sc->jme_dev), "rx_coal_pkt", &sc->jme_rx_coal_to);
+	if (error == 0) {
+		if (sc->jme_rx_coal_pkt < PCCRX_COAL_PKT_MIN ||
+		    sc->jme_rx_coal_pkt > PCCRX_COAL_PKT_MAX) {
+			device_printf(sc->jme_dev,
+			    "tx_coal_pkt value out of range; "
+			    "using default: %d\n", PCCRX_COAL_PKT_DEFAULT);
+			sc->jme_rx_coal_pkt = PCCRX_COAL_PKT_DEFAULT;
+		}
+	}
+}
+
+struct jme_dmamap_arg {
+	bus_addr_t	jme_busaddr;
+};
+
+static void
+jme_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
+{
+	struct jme_dmamap_arg *ctx;
+
+	if (error != 0)
+		return;
+
+	KASSERT(nsegs == 1, ("%s: %d segments returned!", __func__, nsegs));
+
+	ctx = (struct jme_dmamap_arg *)arg;
+	ctx->jme_busaddr = segs[0].ds_addr;
+}
+
+static int
+jme_dma_alloc(struct jme_softc *sc)
+{
+	struct jme_dmamap_arg ctx;
+	struct jme_txdesc *txd;
+	struct jme_rxdesc *rxd;
+	bus_addr_t lowaddr, rx_ring_end, tx_ring_end;
+	int error, i;
+
+	lowaddr = BUS_SPACE_MAXADDR;
+
+again:
+	/* Create parent ring tag. */
+	error = bus_dma_tag_create(bus_get_dma_tag(sc->jme_dev),/* parent */
+	    1, 0,			/* algnmnt, boundary */
+	    lowaddr,			/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    BUS_SPACE_MAXSIZE_32BIT,	/* maxsize */
+	    0,				/* nsegments */
+	    BUS_SPACE_MAXSIZE_32BIT,	/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_ring_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not create parent ring DMA tag.\n");
+		goto fail;
+	}
+	/* Create tag for Tx ring. */
+	error = bus_dma_tag_create(sc->jme_cdata.jme_ring_tag,/* parent */
+	    JME_TX_RING_ALIGN, 0,	/* algnmnt, boundary */
+	    BUS_SPACE_MAXADDR,		/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    JME_TX_RING_SIZE,		/* maxsize */
+	    1,				/* nsegments */
+	    JME_TX_RING_SIZE,		/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_tx_ring_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not allocate Tx ring DMA tag.\n");
+		goto fail;
+	}
+
+	/* Create tag for Rx ring. */
+	error = bus_dma_tag_create(sc->jme_cdata.jme_ring_tag,/* parent */
+	    JME_RX_RING_ALIGN, 0,	/* algnmnt, boundary */
+	    lowaddr,			/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    JME_RX_RING_SIZE,		/* maxsize */
+	    1,				/* nsegments */
+	    JME_RX_RING_SIZE,		/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_rx_ring_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not allocate Rx ring DMA tag.\n");
+		goto fail;
+	}
+
+	/* Allocate DMA'able memory and load the DMA map for Tx ring. */
+	error = bus_dmamem_alloc(sc->jme_cdata.jme_tx_ring_tag,
+	    (void **)&sc->jme_rdata.jme_tx_ring,
+	    BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_COHERENT,
+	    &sc->jme_cdata.jme_tx_ring_map);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not allocate DMA'able memory for Tx ring.\n");
+		goto fail;
+	}
+
+	ctx.jme_busaddr = 0;
+	error = bus_dmamap_load(sc->jme_cdata.jme_tx_ring_tag,
+	    sc->jme_cdata.jme_tx_ring_map, sc->jme_rdata.jme_tx_ring,
+	    JME_TX_RING_SIZE, jme_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
+	if (error != 0 || ctx.jme_busaddr == 0) {
+		device_printf(sc->jme_dev,
+		    "could not load DMA'able memory for Tx ring.\n");
+		goto fail;
+	}
+	sc->jme_rdata.jme_tx_ring_paddr = ctx.jme_busaddr;
+
+	/* Allocate DMA'able memory and load the DMA map for Rx ring. */
+	error = bus_dmamem_alloc(sc->jme_cdata.jme_rx_ring_tag,
+	    (void **)&sc->jme_rdata.jme_rx_ring,
+	    BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_COHERENT,
+	    &sc->jme_cdata.jme_rx_ring_map);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not allocate DMA'able memory for Rx ring.\n");
+		goto fail;
+	}
+
+	ctx.jme_busaddr = 0;
+	error = bus_dmamap_load(sc->jme_cdata.jme_rx_ring_tag,
+	    sc->jme_cdata.jme_rx_ring_map, sc->jme_rdata.jme_rx_ring,
+	    JME_RX_RING_SIZE, jme_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
+	if (error != 0 || ctx.jme_busaddr == 0) {
+		device_printf(sc->jme_dev,
+		    "could not load DMA'able memory for Rx ring.\n");
+		goto fail;
+	}
+	sc->jme_rdata.jme_rx_ring_paddr = ctx.jme_busaddr;
+
+	/* Tx/Rx descriptor queue should reside within 4GB boundary. */
+	tx_ring_end = sc->jme_rdata.jme_tx_ring_paddr + JME_TX_RING_SIZE;
+	rx_ring_end = sc->jme_rdata.jme_rx_ring_paddr + JME_RX_RING_SIZE;
+	if ((JME_ADDR_HI(tx_ring_end) !=
+	    JME_ADDR_HI(sc->jme_rdata.jme_tx_ring_paddr)) ||
+	    (JME_ADDR_HI(rx_ring_end) !=
+	    JME_ADDR_HI(sc->jme_rdata.jme_rx_ring_paddr))) {
+		device_printf(sc->jme_dev, "4GB boundary crossed, "
+		    "switching to 32bit DMA address mode.\n");
+		jme_dma_free(sc);
+		/* Limit DMA address space to 32bit and try again. */
+		lowaddr = BUS_SPACE_MAXADDR_32BIT;
+		goto again;
+	}
+
+	/* Create parent buffer tag. */
+	error = bus_dma_tag_create(bus_get_dma_tag(sc->jme_dev),/* parent */
+	    1, 0,			/* algnmnt, boundary */
+	    BUS_SPACE_MAXADDR,		/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    BUS_SPACE_MAXSIZE_32BIT,	/* maxsize */
+	    0,				/* nsegments */
+	    BUS_SPACE_MAXSIZE_32BIT,	/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_buffer_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not create parent buffer DMA tag.\n");
+		goto fail;
+	}
+
+	/* Create shadow status block tag. */
+	error = bus_dma_tag_create(sc->jme_cdata.jme_buffer_tag,/* parent */
+	    JME_SSB_ALIGN, 0,		/* algnmnt, boundary */
+	    BUS_SPACE_MAXADDR,		/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    JME_SSB_SIZE,		/* maxsize */
+	    1,				/* nsegments */
+	    JME_SSB_SIZE,		/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_ssb_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev,
+		    "could not create shared status block DMA tag.\n");
+		goto fail;
+	}
+
+	/* Create tag for Tx buffers. */
+	error = bus_dma_tag_create(sc->jme_cdata.jme_buffer_tag,/* parent */
+	    1, 0,			/* algnmnt, boundary */
+	    BUS_SPACE_MAXADDR,		/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    JME_TSO_MAXSIZE,		/* maxsize */
+	    JME_MAXTXSEGS,		/* nsegments */
+	    JME_TSO_MAXSEGSIZE,		/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_tx_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev, "could not create Tx DMA tag.\n");
+		goto fail;
+	}
+
+	/* Create tag for Rx buffers. */
+	error = bus_dma_tag_create(sc->jme_cdata.jme_buffer_tag,/* parent */
+	    JME_RX_BUF_ALIGN, 0,	/* algnmnt, boundary */
+	    BUS_SPACE_MAXADDR,		/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    MCLBYTES,			/* maxsize */
+	    1,				/* nsegments */
+	    MCLBYTES,			/* maxsegsize */
+	    0,				/* flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->jme_cdata.jme_rx_tag);
+	if (error != 0) {
+		device_printf(sc->jme_dev, "could not create Rx DMA tag.\n");
+		goto fail;
+	}
+
+	/*
+	 * Allocate DMA'able memory and load the DMA map for shared
+	 * status block.
+	 */
+	error = bus_dmamem_alloc(sc->jme_cdata.jme_ssb_tag,
+	    (void **)&sc->jme_rdata.jme_ssb_block,
+	    BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_COHERENT,
+	    &sc->jme_cdata.jme_ssb_map);
+	if (error != 0) {
+		device_printf(sc->jme_dev, "could not allocate DMA'able "
+		    "memory for shared status block.\n");
+		goto fail;
+	}
+
+	ctx.jme_busaddr = 0;
+	error = bus_dmamap_load(sc->jme_cdata.jme_ssb_tag,
+	    sc->jme_cdata.jme_ssb_map, sc->jme_rdata.jme_ssb_block,
+	    JME_SSB_SIZE, jme_dmamap_cb, &ctx, BUS_DMA_NOWAIT);
+	if (error != 0 || ctx.jme_busaddr == 0) {
+		device_printf(sc->jme_dev, "could not load DMA'able memory "
+		    "for shared status block.\n");
+		goto fail;
+	}
+	sc->jme_rdata.jme_ssb_block_paddr = ctx.jme_busaddr;
+
+	/* Create DMA maps for Tx buffers. */
+	for (i = 0; i < JME_TX_RING_CNT; i++) {
+		txd = &sc->jme_cdata.jme_txdesc[i];
+		txd->tx_m = NULL;
+		txd->tx_dmamap = NULL;
+		error = bus_dmamap_create(sc->jme_cdata.jme_tx_tag, 0,
+		    &txd->tx_dmamap);
+		if (error != 0) {
+			device_printf(sc->jme_dev,
+			    "could not create Tx dmamap.\n");
+			goto fail;
+		}
+	}
+	/* Create DMA maps for Rx buffers. */
+	if ((error = bus_dmamap_create(sc->jme_cdata.jme_rx_tag, 0,
+	    &sc->jme_cdata.jme_rx_sparemap)) != 0) {
+		device_printf(sc->jme_dev,
+		    "could not create spare Rx dmamap.\n");
+		goto fail;
+	}
+	for (i = 0; i < JME_RX_RING_CNT; i++) {
+		rxd = &sc->jme_cdata.jme_rxdesc[i];
+		rxd->rx_m = NULL;
+		rxd->rx_dmamap = NULL;
+		error = bus_dmamap_create(sc->jme_cdata.jme_rx_tag, 0,
+		    &rxd->rx_dmamap);
+		if (error != 0) {
+			device_printf(sc->jme_dev,
+			    "could not create Rx dmamap.\n");
+			goto fail;
+		}
+	}
+
+fail:
+	return (error);
+}
+
+static void
+jme_dma_free(struct jme_softc *sc)
+{
+	struct jme_txdesc *txd;
+	struct jme_rxdesc *rxd;
+	int i;
+
+	/* Tx ring */
+	if (sc->jme_cdata.jme_tx_ring_tag != NULL) {
+		if (sc->jme_cdata.jme_tx_ring_map)
+			bus_dmamap_unload(sc->jme_cdata.jme_tx_ring_tag,
+			    sc->jme_cdata.jme_tx_ring_map);
+		if (sc->jme_cdata.jme_tx_ring_map &&
+		    sc->jme_rdata.jme_tx_ring)
+			bus_dmamem_free(sc->jme_cdata.jme_tx_ring_tag,
+			    sc->jme_rdata.jme_tx_ring,
+			    sc->jme_cdata.jme_tx_ring_map);
+		sc->jme_rdata.jme_tx_ring = NULL;
+		sc->jme_cdata.jme_tx_ring_map = NULL;
+		bus_dma_tag_destroy(sc->jme_cdata.jme_tx_ring_tag);
+		sc->jme_cdata.jme_tx_ring_tag = NULL;
+	}
+	/* Rx ring */
+	if (sc->jme_cdata.jme_rx_ring_tag != NULL) {
+		if (sc->jme_cdata.jme_rx_ring_map)
+			bus_dmamap_unload(sc->jme_cdata.jme_rx_ring_tag,
+			    sc->jme_cdata.jme_rx_ring_map);
+		if (sc->jme_cdata.jme_rx_ring_map &&
+		    sc->jme_rdata.jme_rx_ring)
+			bus_dmamem_free(sc->jme_cdata.jme_rx_ring_tag,
+			    sc->jme_rdata.jme_rx_ring,
+			    sc->jme_cdata.jme_rx_ring_map);
+		sc->jme_rdata.jme_rx_ring = NULL;
+		sc->jme_cdata.jme_rx_ring_map = NULL;
+		bus_dma_tag_destroy(sc->jme_cdata.jme_rx_ring_tag);
+		sc->jme_cdata.jme_rx_ring_tag = NULL;
+	}
+	/* Tx buffers */
+	if (sc->jme_cdata.jme_tx_tag != NULL) {
+		for (i = 0; i < JME_TX_RING_CNT; i++) {
+			txd = &sc->jme_cdata.jme_txdesc[i];
+			if (txd->tx_dmamap != NULL) {
+				bus_dmamap_destroy(sc->jme_cdata.jme_tx_tag,
+				    txd->tx_dmamap);
+				txd->tx_dmamap = NULL;
+			}
+		}
+		bus_dma_tag_destroy(sc->jme_cdata.jme_tx_tag);
+		sc->jme_cdata.jme_tx_tag = NULL;
+	}
+	/* Rx buffers */
+	if (sc->jme_cdata.jme_rx_tag != NULL) {
+		for (i = 0; i < JME_RX_RING_CNT; i++) {
+			rxd = &sc->jme_cdata.jme_rxdesc[i];
+			if (rxd->rx_dmamap != NULL) {
+				bus_dmamap_destroy(sc->jme_cdata.jme_rx_tag,
+				    rxd->rx_dmamap);
+				rxd->rx_dmamap = NULL;
+			}
+		}
+		if (sc->jme_cdata.jme_rx_sparemap != NULL) {
+			bus_dmamap_destroy(sc->jme_cdata.jme_rx_tag,
+			    sc->jme_cdata.jme_rx_sparemap);
+			sc->jme_cdata.jme_rx_sparemap = NULL;
+		}
+		bus_dma_tag_destroy(sc->jme_cdata.jme_rx_tag);
+		sc->jme_cdata.jme_rx_tag = NULL;
+	}
+
+	/* Shared status block. */
+	if (sc->jme_cdata.jme_ssb_tag != NULL) {
+		if (sc->jme_cdata.jme_ssb_map)
+			bus_dmamap_unload(sc->jme_cdata.jme_ssb_tag,
+			    sc->jme_cdata.jme_ssb_map);
+		if (sc->jme_cdata.jme_ssb_map && sc->jme_rdata.jme_ssb_block)
+			bus_dmamem_free(sc->jme_cdata.jme_ssb_tag,
+			    sc->jme_rdata.jme_ssb_block,
+			    sc->jme_cdata.jme_ssb_map);
+		sc->jme_rdata.jme_ssb_block = NULL;
+		sc->jme_cdata.jme_ssb_map = NULL;
+		bus_dma_tag_destroy(sc->jme_cdata.jme_ssb_tag);
+		sc->jme_cdata.jme_ssb_tag = NULL;
+	}
+
+	if (sc->jme_cdata.jme_buffer_tag != NULL) {
+		bus_dma_tag_destroy(sc->jme_cdata.jme_buffer_tag);
+		sc->jme_cdata.jme_buffer_tag = NULL;
+	}
+	if (sc->jme_cdata.jme_ring_tag != NULL) {
+		bus_dma_tag_destroy(sc->jme_cdata.jme_ring_tag);
+		sc->jme_cdata.jme_ring_tag = NULL;
+	}
+}
+
+/*
+ *	Make sure the interface is stopped at reboot time.
+ */
+static int
+jme_shutdown(device_t dev)
+{
+
+	return (jme_suspend(dev));
+}
+
+/*
+ * Unlike other ethernet controllers, JMC250 requires
+ * explicit resetting link speed to 10/100Mbps as gigabit
+ * link will cunsume more power than 375mA.
+ * Note, we reset the link speed to 10/100Mbps with
+ * auto-negotiation but we don't know whether that operation
+ * would succeed or not as we have no control after powering
+ * off. If the renegotiation fail WOL may not work. Running
+ * at 1Gbps draws more power than 375mA at 3.3V which is
+ * specified in PCI specification and that would result in
+ * complete shutdowning power to ethernet controller.
+ *
+ * TODO
+ *  Save current negotiated media speed/duplex/flow-control
+ *  to softc and restore the same link again after resuming.
+ *  PHY handling such as power down/resetting to 100Mbps
+ *  may be better handled in suspend method in phy driver.
+ */
+static void
+jme_setlinkspeed(struct jme_softc *sc)
+{
+	struct mii_data *mii;
+	int aneg, i;
+
+	JME_LOCK_ASSERT(sc);
+
+	mii = device_get_softc(sc->jme_miibus);
+	mii_pollstat(mii);
+	aneg = 0;
+	if ((mii->mii_media_status & IFM_AVALID) != 0) {
+		switch IFM_SUBTYPE(mii->mii_media_active) {
+		case IFM_10_T:
+		case IFM_100_TX:
+			return;
+		case IFM_1000_T:
+			aneg++;
+		default:
+			break;
+		}
+	}
+	jme_miibus_writereg(sc->jme_dev, sc->jme_phyaddr, MII_100T2CR, 0);
+	jme_miibus_writereg(sc->jme_dev, sc->jme_phyaddr, MII_ANAR,
+	    ANAR_TX_FD | ANAR_TX | ANAR_10_FD | ANAR_10 | ANAR_CSMA);
+	jme_miibus_writereg(sc->jme_dev, sc->jme_phyaddr, MII_BMCR,
+	    BMCR_AUTOEN | BMCR_STARTNEG);
+	DELAY(1000);
+	if (aneg != 0) {
+		/* Poll link state until jme(4) get a 10/100 link. */
+		for (i = 0; i < MII_ANEGTICKS_GIGE; i++) {
+			mii_pollstat(mii);
+			if ((mii->mii_media_status & IFM_AVALID) != 0) {
+				switch (IFM_SUBTYPE(mii->mii_media_active)) {
+				case IFM_10_T:
+				case IFM_100_TX:
+					jme_mac_config(sc);
+					return;
+				default:
+					break;
+				}
+			}
+			JME_UNLOCK(sc);
+			pause("jmelnk", hz);
+			JME_LOCK(sc);
+		}
+		if (i == MII_ANEGTICKS_GIGE)
+			device_printf(sc->jme_dev, "establishing link failed, "
+			    "WOL may not work!");
+	}
+	/*
+	 * No link, force MAC to have 100Mbps, full-duplex link.
+	 * This is the last resort and may/may not work.
+	 */
+	mii->mii_media_status = IFM_AVALID | IFM_ACTIVE;
+	mii->mii_media_active = IFM_ETHER | IFM_100_TX | IFM_FDX;
+	jme_mac_config(sc);
+}
+
+static void
+jme_setwol(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	uint32_t gpr, pmcs;
+	uint16_t pmstat;
+	int pmc;
+
+	JME_LOCK_ASSERT(sc);
+
+	if (pci_find_extcap(sc->jme_dev, PCIY_PMG, &pmc) != 0) {
+		/* No PME capability, PHY power down. */
+		jme_miibus_writereg(sc->jme_dev, sc->jme_phyaddr,
+		    MII_BMCR, BMCR_PDOWN);
+		return;
+	}
+
+	ifp = sc->jme_ifp;
+	gpr = CSR_READ_4(sc, JME_GPREG0) & ~GPREG0_PME_ENB;
+	pmcs = CSR_READ_4(sc, JME_PMCS);
+	pmcs &= ~PMCS_WOL_ENB_MASK;
+	if ((ifp->if_capenable & IFCAP_WOL_MAGIC) != 0) {
+		pmcs |= PMCS_MAGIC_FRAME | PMCS_MAGIC_FRAME_ENB;
+		/* Enable PME message. */
+		gpr |= GPREG0_PME_ENB;
+		/* For gigabit controllers, reset link speed to 10/100. */
+		if ((sc->jme_flags & JME_FLAG_FASTETH) == 0)
+			jme_setlinkspeed(sc);
+	}
+
+	CSR_WRITE_4(sc, JME_PMCS, pmcs);
+	CSR_WRITE_4(sc, JME_GPREG0, gpr);
+
+	/* Request PME. */
+	pmstat = pci_read_config(sc->jme_dev, pmc + PCIR_POWER_STATUS, 2);
+	pmstat &= ~(PCIM_PSTAT_PME | PCIM_PSTAT_PMEENABLE);
+	if ((ifp->if_capenable & IFCAP_WOL) != 0)
+		pmstat |= PCIM_PSTAT_PME | PCIM_PSTAT_PMEENABLE;
+	pci_write_config(sc->jme_dev, pmc + PCIR_POWER_STATUS, pmstat, 2);
+	if ((ifp->if_capenable & IFCAP_WOL) == 0) {
+		/* No WOL, PHY power down. */
+		jme_miibus_writereg(sc->jme_dev, sc->jme_phyaddr,
+		    MII_BMCR, BMCR_PDOWN);
+	}
+}
+
+static int
+jme_suspend(device_t dev)
+{
+	struct jme_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	JME_LOCK(sc);
+	jme_stop(sc);
+	jme_setwol(sc);
+	JME_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+jme_resume(device_t dev)
+{
+	struct jme_softc *sc;
+	struct ifnet *ifp;
+	uint16_t pmstat;
+	int pmc;
+
+	sc = device_get_softc(dev);
+
+	JME_LOCK(sc);
+	if (pci_find_extcap(sc->jme_dev, PCIY_PMG, &pmc) != 0) {
+		pmstat = pci_read_config(sc->jme_dev,
+		    pmc + PCIR_POWER_STATUS, 2);
+		/* Disable PME clear PME status. */
+		pmstat &= ~PCIM_PSTAT_PMEENABLE;
+		pci_write_config(sc->jme_dev,
+		    pmc + PCIR_POWER_STATUS, pmstat, 2);
+	}
+	ifp = sc->jme_ifp;
+	if ((ifp->if_flags & IFF_UP) != 0)
+		jme_init_locked(sc);
+
+	JME_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+jme_encap(struct jme_softc *sc, struct mbuf **m_head)
+{
+	struct jme_txdesc *txd;
+	struct jme_desc *desc;
+	struct mbuf *m;
+	bus_dma_segment_t txsegs[JME_MAXTXSEGS];
+	int error, i, nsegs, prod;
+	uint32_t cflags, tso_segsz;
+
+	JME_LOCK_ASSERT(sc);
+
+	M_ASSERTPKTHDR((*m_head));
+
+	if (((*m_head)->m_pkthdr.csum_flags & CSUM_TSO) != 0) {
+		/*
+		 * Due to the adherence to NDIS specification JMC250
+		 * assumes upper stack computed TCP pseudo checksum
+		 * without including payload length. This breaks
+		 * checksum offload for TSO case so recompute TCP
+		 * pseudo checksum for JMC250. Hopefully this wouldn't
+		 * be much burden on modern CPUs.
+		 */
+		struct ether_header *eh;
+		struct ip *ip;
+		struct tcphdr *tcp;
+		uint32_t ip_off, poff;
+
+		if (M_WRITABLE(*m_head) == 0) {
+			/* Get a writable copy. */
+			m = m_dup(*m_head, M_DONTWAIT);
+			m_freem(*m_head);
+			if (m == NULL) {
+				*m_head = NULL;
+				return (ENOBUFS);
+			}
+			*m_head = m;
+		}
+		ip_off = sizeof(struct ether_header);
+		m = m_pullup(*m_head, ip_off);
+		if (m == NULL) {
+			*m_head = NULL;
+			return (ENOBUFS);
+		}
+		eh = mtod(m, struct ether_header *);
+		/* Check the existence of VLAN tag. */
+		if (eh->ether_type == htons(ETHERTYPE_VLAN)) {
+			ip_off = sizeof(struct ether_vlan_header);
+			m = m_pullup(m, ip_off);
+			if (m == NULL) {
+				*m_head = NULL;
+				return (ENOBUFS);
+			}
+		}
+		m = m_pullup(m, ip_off + sizeof(struct ip));
+		if (m == NULL) {
+			*m_head = NULL;
+			return (ENOBUFS);
+		}
+		ip = (struct ip *)(mtod(m, char *) + ip_off);
+		poff = ip_off + (ip->ip_hl << 2);
+		m = m_pullup(m, poff + sizeof(struct tcphdr));
+		if (m == NULL) {
+			*m_head = NULL;
+			return (ENOBUFS);
+		}
+		tcp = (struct tcphdr *)(mtod(m, char *) + poff);
+		/*
+		 * Reset IP checksum and recompute TCP pseudo
+		 * checksum that NDIS specification requires.
+		 */
+		ip->ip_sum = 0;
+		if (poff + (tcp->th_off << 2) == m->m_pkthdr.len) {
+			tcp->th_sum = in_pseudo(ip->ip_src.s_addr,
+			    ip->ip_dst.s_addr,
+			    htons((tcp->th_off << 2) + IPPROTO_TCP));
+			/* No need to TSO, force IP checksum offload. */
+			(*m_head)->m_pkthdr.csum_flags &= ~CSUM_TSO;
+			(*m_head)->m_pkthdr.csum_flags |= CSUM_IP;
+		} else
+			tcp->th_sum = in_pseudo(ip->ip_src.s_addr,
+			    ip->ip_dst.s_addr, htons(IPPROTO_TCP));
+		*m_head = m;
+	}
+
+	prod = sc->jme_cdata.jme_tx_prod;
+	txd = &sc->jme_cdata.jme_txdesc[prod];
+
+	error = bus_dmamap_load_mbuf_sg(sc->jme_cdata.jme_tx_tag,
+	    txd->tx_dmamap, *m_head, txsegs, &nsegs, 0);
+	if (error == EFBIG) {
+		m = m_collapse(*m_head, M_DONTWAIT, JME_MAXTXSEGS);
+		if (m == NULL) {
+			m_freem(*m_head);
+			*m_head = NULL;
+			return (ENOMEM);
+		}
+		*m_head = m;
+		error = bus_dmamap_load_mbuf_sg(sc->jme_cdata.jme_tx_tag,
+		    txd->tx_dmamap, *m_head, txsegs, &nsegs, 0);
+		if (error != 0) {
+			m_freem(*m_head);
+			*m_head = NULL;
+			return (error);
+		}
+	} else if (error != 0)
+		return (error);
+	if (nsegs == 0) {
+		m_freem(*m_head);
+		*m_head = NULL;
+		return (EIO);
+	}
+
+	/*
+	 * Check descriptor overrun. Leave one free descriptor.
+	 * Since we always use 64bit address mode for transmitting,
+	 * each Tx request requires one more dummy descriptor.
+	 */
+	if (sc->jme_cdata.jme_tx_cnt + nsegs + 1 > JME_TX_RING_CNT - 1) {
+		bus_dmamap_unload(sc->jme_cdata.jme_tx_tag, txd->tx_dmamap);
+		return (ENOBUFS);
+	}
+
+	m = *m_head;
+	cflags = 0;
+	tso_segsz = 0;
+	/* Configure checksum offload and TSO. */
+	if ((m->m_pkthdr.csum_flags & CSUM_TSO) != 0) {
+		tso_segsz = (uint32_t)m->m_pkthdr.tso_segsz <<
+		    JME_TD_MSS_SHIFT;
+		cflags |= JME_TD_TSO;
+	} else {
+		if ((m->m_pkthdr.csum_flags & CSUM_IP) != 0)
+			cflags |= JME_TD_IPCSUM;
+		if ((m->m_pkthdr.csum_flags & CSUM_TCP) != 0)
+			cflags |= JME_TD_TCPCSUM;
+		if ((m->m_pkthdr.csum_flags & CSUM_UDP) != 0)
+			cflags |= JME_TD_UDPCSUM;
+	}
+	/* Configure VLAN. */
+	if ((m->m_flags & M_VLANTAG) != 0) {
+		cflags |= (m->m_pkthdr.ether_vtag & JME_TD_VLAN_MASK);
+		cflags |= JME_TD_VLAN_TAG;
+	}
+
+	desc = &sc->jme_rdata.jme_tx_ring[prod];
+	desc->flags = htole32(cflags);
+	desc->buflen = htole32(tso_segsz);
+	desc->addr_hi = htole32(m->m_pkthdr.len);
+	desc->addr_lo = 0;
+	sc->jme_cdata.jme_tx_cnt++;
+	JME_DESC_INC(prod, JME_TX_RING_CNT);
+	for (i = 0; i < nsegs; i++) {
+		desc = &sc->jme_rdata.jme_tx_ring[prod];
+		desc->flags = htole32(JME_TD_OWN | JME_TD_64BIT);
+		desc->buflen = htole32(txsegs[i].ds_len);
+		desc->addr_hi = htole32(JME_ADDR_HI(txsegs[i].ds_addr));
+		desc->addr_lo = htole32(JME_ADDR_LO(txsegs[i].ds_addr));
+		sc->jme_cdata.jme_tx_cnt++;
+		JME_DESC_INC(prod, JME_TX_RING_CNT);
+	}
+
+	/* Update producer index. */
+	sc->jme_cdata.jme_tx_prod = prod;
+	/*
+	 * Finally request interrupt and give the first descriptor
+	 * owenership to hardware.
+	 */
+	desc = txd->tx_desc;
+	desc->flags |= htole32(JME_TD_OWN | JME_TD_INTR);
+
+	txd->tx_m = m;
+	txd->tx_ndesc = nsegs + 1;
+
+	/* Sync descriptors. */
+	bus_dmamap_sync(sc->jme_cdata.jme_tx_tag, txd->tx_dmamap,
+	    BUS_DMASYNC_PREWRITE);
+	bus_dmamap_sync(sc->jme_cdata.jme_tx_ring_tag,
+	    sc->jme_cdata.jme_tx_ring_map,
+	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+
+	return (0);
+}
+
+static void
+jme_tx_task(void *arg, int pending)
+{
+	struct ifnet *ifp;
+
+	ifp = (struct ifnet *)arg;
+	jme_start(ifp);
+}
+
+static void
+jme_start(struct ifnet *ifp)
+{
+        struct jme_softc *sc;
+        struct mbuf *m_head;
+	int enq;
+
+	sc = ifp->if_softc;
+
+	JME_LOCK(sc);
+
+	if (sc->jme_cdata.jme_tx_cnt >= JME_TX_DESC_HIWAT)
+		jme_txeof(sc);
+
+	if ((ifp->if_drv_flags & (IFF_DRV_RUNNING | IFF_DRV_OACTIVE)) !=
+	    IFF_DRV_RUNNING || (sc->jme_flags & JME_FLAG_LINK) == 0) {
+		JME_UNLOCK(sc);
+		return;
+	}
+
+	for (enq = 0; !IFQ_DRV_IS_EMPTY(&ifp->if_snd); ) {
+		IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
+		if (m_head == NULL)
+			break;
+		/*
+		 * Pack the data into the transmit ring. If we
+		 * don't have room, set the OACTIVE flag and wait
+		 * for the NIC to drain the ring.
+		 */
+		if (jme_encap(sc, &m_head)) {
+			if (m_head == NULL)
+				break;
+			IFQ_DRV_PREPEND(&ifp->if_snd, m_head);
+			ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+			break;
+		}
+
+		enq++;
+		/*
+		 * If there's a BPF listener, bounce a copy of this frame
+		 * to him.
+		 */
+		ETHER_BPF_MTAP(ifp, m_head);
+	}
+
+	if (enq > 0) {
+		/*
+		 * Reading TXCSR takes very long time under heavy load
+		 * so cache TXCSR value and writes the ORed value with
+		 * the kick command to the TXCSR. This saves one register
+		 * access cycle.
+		 */
+		CSR_WRITE_4(sc, JME_TXCSR, sc->jme_txcsr | TXCSR_TX_ENB |
+		    TXCSR_TXQ_N_START(TXCSR_TXQ0));
+		/* Set a timeout in case the chip goes out to lunch. */
+		sc->jme_watchdog_timer = JME_TX_TIMEOUT;
+	}
+
+	JME_UNLOCK(sc);
+}
+
+static void
+jme_watchdog(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+
+	JME_LOCK_ASSERT(sc);
+
+	if (sc->jme_watchdog_timer == 0 || --sc->jme_watchdog_timer)
+		return;
+
+	ifp = sc->jme_ifp;
+	if ((sc->jme_flags & JME_FLAG_LINK) == 0) {
+		if_printf(sc->jme_ifp, "watchdog timeout (missed link)\n");
+		ifp->if_oerrors++;
+		jme_init_locked(sc);
+		return;
+	}
+	jme_txeof(sc);
+	if (sc->jme_cdata.jme_tx_cnt == 0) {
+		if_printf(sc->jme_ifp,
+		    "watchdog timeout (missed Tx interrupts) -- recovering\n");
+		if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+			taskqueue_enqueue(sc->jme_tq, &sc->jme_tx_task);
+		return;
+	}
+
+	if_printf(sc->jme_ifp, "watchdog timeout\n");
+	ifp->if_oerrors++;
+	jme_init_locked(sc);
+	if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+		taskqueue_enqueue(sc->jme_tq, &sc->jme_tx_task);
+}
+
+static int
+jme_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	struct jme_softc *sc;
+	struct ifreq *ifr;
+	struct mii_data *mii;
+	uint32_t reg;
+	int error, mask;
+
+	sc = ifp->if_softc;
+	ifr = (struct ifreq *)data;
+	error = 0;
+	switch (cmd) {
+	case SIOCSIFMTU:
+		if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > JME_JUMBO_MTU ||
+		    ((sc->jme_flags & JME_FLAG_NOJUMBO) != 0 &&
+		    ifr->ifr_mtu > JME_MAX_MTU)) {
+			error = EINVAL;
+			break;
+		}
+
+		if (ifp->if_mtu != ifr->ifr_mtu) {
+			/*
+			 * No special configuration is required when interface
+			 * MTU is changed but availability of TSO/Tx checksum
+			 * offload should be chcked against new MTU size as
+			 * FIFO size is just 2K.
+			 */
+			JME_LOCK(sc);
+			if (ifr->ifr_mtu >= JME_TX_FIFO_SIZE) {
+				ifp->if_capenable &=
+				    ~(IFCAP_TXCSUM | IFCAP_TSO4);
+				ifp->if_hwassist &=
+				    ~(JME_CSUM_FEATURES | CSUM_TSO);
+				VLAN_CAPABILITIES(ifp);
+			}
+			ifp->if_mtu = ifr->ifr_mtu;
+			if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
+				jme_init_locked(sc);
+			JME_UNLOCK(sc);
+		}
+		break;
+	case SIOCSIFFLAGS:
+		JME_LOCK(sc);
+		if ((ifp->if_flags & IFF_UP) != 0) {
+			if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0) {
+				if (((ifp->if_flags ^ sc->jme_if_flags)
+				    & (IFF_PROMISC | IFF_ALLMULTI)) != 0)
+					jme_set_filter(sc);
+			} else {
+				if ((sc->jme_flags & JME_FLAG_DETACH) == 0)
+					jme_init_locked(sc);
+			}
+		} else {
+			if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
+				jme_stop(sc);
+		}
+		sc->jme_if_flags = ifp->if_flags;
+		JME_UNLOCK(sc);
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		JME_LOCK(sc);
+		if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0)
+			jme_set_filter(sc);
+		JME_UNLOCK(sc);
+		break;
+	case SIOCSIFMEDIA:
+	case SIOCGIFMEDIA:
+		mii = device_get_softc(sc->jme_miibus);
+		error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, cmd);
+		break;
+	case SIOCSIFCAP:
+		JME_LOCK(sc);
+		mask = ifr->ifr_reqcap ^ ifp->if_capenable;
+		if ((mask & IFCAP_TXCSUM) != 0 &&
+		    ifp->if_mtu < JME_TX_FIFO_SIZE) {
+			if ((IFCAP_TXCSUM & ifp->if_capabilities) != 0) {
+				ifp->if_capenable ^= IFCAP_TXCSUM;
+				if ((IFCAP_TXCSUM & ifp->if_capenable) != 0)
+					ifp->if_hwassist |= JME_CSUM_FEATURES;
+				else
+					ifp->if_hwassist &= ~JME_CSUM_FEATURES;
+			}
+		}
+		if ((mask & IFCAP_RXCSUM) != 0 &&
+		    (IFCAP_RXCSUM & ifp->if_capabilities) != 0) {
+			ifp->if_capenable ^= IFCAP_RXCSUM;
+			reg = CSR_READ_4(sc, JME_RXMAC);
+			reg &= ~RXMAC_CSUM_ENB;
+			if ((ifp->if_capenable & IFCAP_RXCSUM) != 0)
+				reg |= RXMAC_CSUM_ENB;
+			CSR_WRITE_4(sc, JME_RXMAC, reg);
+		}
+		if ((mask & IFCAP_TSO4) != 0 &&
+		    ifp->if_mtu < JME_TX_FIFO_SIZE) {
+			if ((IFCAP_TSO4 & ifp->if_capabilities) != 0) {
+				ifp->if_capenable ^= IFCAP_TSO4;
+				if ((IFCAP_TSO4 & ifp->if_capenable) != 0)
+					ifp->if_hwassist |= CSUM_TSO;
+				else
+					ifp->if_hwassist &= ~CSUM_TSO;
+			}
+		}
+		if ((mask & IFCAP_WOL_MAGIC) != 0 &&
+		    (IFCAP_WOL_MAGIC & ifp->if_capabilities) != 0)
+			ifp->if_capenable ^= IFCAP_WOL_MAGIC;
+		if ((mask & IFCAP_VLAN_HWCSUM) != 0 &&
+		    (ifp->if_capabilities & IFCAP_VLAN_HWCSUM) != 0)
+			ifp->if_capenable ^= IFCAP_VLAN_HWCSUM;
+		if ((mask & IFCAP_VLAN_HWTAGGING) != 0 &&
+		    (IFCAP_VLAN_HWTAGGING & ifp->if_capabilities) != 0) {
+			ifp->if_capenable ^= IFCAP_VLAN_HWTAGGING;
+			jme_set_vlan(sc);
+		}
+		JME_UNLOCK(sc);
+		VLAN_CAPABILITIES(ifp);
+		break;
+	default:
+		error = ether_ioctl(ifp, cmd, data);
+		break;
+	}
+
+	return (error);
+}
+
+static void
+jme_mac_config(struct jme_softc *sc)
+{
+	struct mii_data *mii;
+	uint32_t ghc, rxmac, txmac, txpause;
+
+	JME_LOCK_ASSERT(sc);
+
+	mii = device_get_softc(sc->jme_miibus);
+
+	CSR_WRITE_4(sc, JME_GHC, GHC_RESET);
+	DELAY(10);
+	CSR_WRITE_4(sc, JME_GHC, 0);
+	ghc = 0;
+	rxmac = CSR_READ_4(sc, JME_RXMAC);
+	rxmac &= ~RXMAC_FC_ENB;
+	txmac = CSR_READ_4(sc, JME_TXMAC);
+	txmac &= ~(TXMAC_CARRIER_EXT | TXMAC_FRAME_BURST);
+	txpause = CSR_READ_4(sc, JME_TXPFC);
+	txpause &= ~TXPFC_PAUSE_ENB;
+	if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) != 0) {
+		ghc |= GHC_FULL_DUPLEX;
+		rxmac &= ~RXMAC_COLL_DET_ENB;
+		txmac &= ~(TXMAC_COLL_ENB | TXMAC_CARRIER_SENSE |
+		    TXMAC_BACKOFF | TXMAC_CARRIER_EXT |
+		    TXMAC_FRAME_BURST);
+#ifdef notyet
+		if ((IFM_OPTIONS(mii->mii_media_active) & IFM_ETH_TXPAUSE) != 0)
+			txpause |= TXPFC_PAUSE_ENB;
+		if ((IFM_OPTIONS(mii->mii_media_active) & IFM_ETH_RXPAUSE) != 0)
+			rxmac |= RXMAC_FC_ENB;
+#endif
+		/* Disable retry transmit timer/retry limit. */
+		CSR_WRITE_4(sc, JME_TXTRHD, CSR_READ_4(sc, JME_TXTRHD) &
+		    ~(TXTRHD_RT_PERIOD_ENB | TXTRHD_RT_LIMIT_ENB));
+	} else {
+		rxmac |= RXMAC_COLL_DET_ENB;
+		txmac |= TXMAC_COLL_ENB | TXMAC_CARRIER_SENSE | TXMAC_BACKOFF;
+		/* Enable retry transmit timer/retry limit. */
+		CSR_WRITE_4(sc, JME_TXTRHD, CSR_READ_4(sc, JME_TXTRHD) |
+		    TXTRHD_RT_PERIOD_ENB | TXTRHD_RT_LIMIT_ENB);
+	}
+		/* Reprogram Tx/Rx MACs with resolved speed/duplex. */
+	switch (IFM_SUBTYPE(mii->mii_media_active)) {
+	case IFM_10_T:
+		ghc |= GHC_SPEED_10;
+		break;
+	case IFM_100_TX:
+		ghc |= GHC_SPEED_100;
+		break;
+	case IFM_1000_T:
+		if ((sc->jme_flags & JME_FLAG_FASTETH) != 0)
+			break;
+		ghc |= GHC_SPEED_1000;
+		if ((IFM_OPTIONS(mii->mii_media_active) & IFM_FDX) == 0)
+			txmac |= TXMAC_CARRIER_EXT | TXMAC_FRAME_BURST;
+		break;
+	default:
+		break;
+	}
+	CSR_WRITE_4(sc, JME_GHC, ghc);
+	CSR_WRITE_4(sc, JME_RXMAC, rxmac);
+	CSR_WRITE_4(sc, JME_TXMAC, txmac);
+	CSR_WRITE_4(sc, JME_TXPFC, txpause);
+}
+
+static void
+jme_link_task(void *arg, int pending)
+{
+	struct jme_softc *sc;
+	struct mii_data *mii;
+	struct ifnet *ifp;
+	struct jme_txdesc *txd;
+	bus_addr_t paddr;
+	int i;
+
+	sc = (struct jme_softc *)arg;
+
+	JME_LOCK(sc);
+	mii = device_get_softc(sc->jme_miibus);
+	ifp = sc->jme_ifp;
+	if (mii == NULL || ifp == NULL ||
+	    (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
+		JME_UNLOCK(sc);
+		return;
+	}
+
+	sc->jme_flags &= ~JME_FLAG_LINK;
+	if ((mii->mii_media_status & IFM_AVALID) != 0) {
+		switch (IFM_SUBTYPE(mii->mii_media_active)) {
+		case IFM_10_T:
+		case IFM_100_TX:
+			sc->jme_flags |= JME_FLAG_LINK;
+			break;
+		case IFM_1000_T:
+			if ((sc->jme_flags & JME_FLAG_FASTETH) == 0)
+				break;
+			sc->jme_flags |= JME_FLAG_LINK;
+			break;
+		default:
+			break;
+		}
+	}
+
+	/*
+	 * Disabling Rx/Tx MACs have a side-effect of resetting
+	 * JME_TXNDA/JME_RXNDA register to the first address of
+	 * Tx/Rx descriptor address. So driver should reset its
+	 * internal procucer/consumer pointer and reclaim any
+	 * allocated resources. Note, just saving the value of
+	 * JME_TXNDA and JME_RXNDA registers before stopping MAC
+	 * and restoring JME_TXNDA/JME_RXNDA register is not
+	 * sufficient to make sure correct MAC state because
+	 * stopping MAC operation can take a while and hardware
+	 * might have updated JME_TXNDA/JME_RXNDA registers
+	 * during the stop operation.
+	 */
+	/* Block execution of task. */
+	taskqueue_block(sc->jme_tq);
+	/* Disable interrupts and stop driver. */
+	CSR_WRITE_4(sc, JME_INTR_MASK_CLR, JME_INTRS);
+	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
+	callout_stop(&sc->jme_tick_ch);
+	sc->jme_watchdog_timer = 0;
+
+	/* Stop receiver/transmitter. */
+	jme_stop_rx(sc);
+	jme_stop_tx(sc);
+
+	/* XXX Drain all queued tasks. */
+	JME_UNLOCK(sc);
+	taskqueue_drain(sc->jme_tq, &sc->jme_int_task);
+	taskqueue_drain(sc->jme_tq, &sc->jme_tx_task);
+	JME_LOCK(sc);
+
+	jme_rxintr(sc, JME_RX_RING_CNT);
+	if (sc->jme_cdata.jme_rxhead != NULL)
+		m_freem(sc->jme_cdata.jme_rxhead);
+	JME_RXCHAIN_RESET(sc);
+	jme_txeof(sc);
+	if (sc->jme_cdata.jme_tx_cnt != 0) {
+		/* Remove queued packets for transmit. */
+		for (i = 0; i < JME_TX_RING_CNT; i++) {
+			txd = &sc->jme_cdata.jme_txdesc[i];
+			if (txd->tx_m != NULL) {
+				bus_dmamap_sync(
+				    sc->jme_cdata.jme_tx_tag,
+				    txd->tx_dmamap,
+				    BUS_DMASYNC_POSTWRITE);
+				bus_dmamap_unload(
+				    sc->jme_cdata.jme_tx_tag,
+				    txd->tx_dmamap);
+				m_freem(txd->tx_m);
+				txd->tx_m = NULL;
+				txd->tx_ndesc = 0;
+				ifp->if_oerrors++;
+			}
+		}
+	}
+
+	/*
+	 * Reuse configured Rx descriptors and reset
+	 * procuder/consumer index.
+	 */
+	sc->jme_cdata.jme_rx_cons = 0;
+	atomic_set_int(&sc->jme_morework, 0);
+	jme_init_tx_ring(sc);
+	/* Initialize shadow status block. */
+	jme_init_ssb(sc);
+
+	/* Program MAC with resolved speed/duplex/flow-control. */
+	if ((sc->jme_flags & JME_FLAG_LINK) != 0) {
+		jme_mac_config(sc);
+
+		CSR_WRITE_4(sc, JME_RXCSR, sc->jme_rxcsr);
+		CSR_WRITE_4(sc, JME_TXCSR, sc->jme_txcsr);
+
+		/* Set Tx ring address to the hardware. */
+		paddr = JME_TX_RING_ADDR(sc, 0);
+		CSR_WRITE_4(sc, JME_TXDBA_HI, JME_ADDR_HI(paddr));
+		CSR_WRITE_4(sc, JME_TXDBA_LO, JME_ADDR_LO(paddr));
+
+		/* Set Rx ring address to the hardware. */
+		paddr = JME_RX_RING_ADDR(sc, 0);
+		CSR_WRITE_4(sc, JME_RXDBA_HI, JME_ADDR_HI(paddr));
+		CSR_WRITE_4(sc, JME_RXDBA_LO, JME_ADDR_LO(paddr));
+
+		/* Restart receiver/transmitter. */
+		CSR_WRITE_4(sc, JME_RXCSR, sc->jme_rxcsr | RXCSR_RX_ENB |
+		    RXCSR_RXQ_START);
+		CSR_WRITE_4(sc, JME_TXCSR, sc->jme_txcsr | TXCSR_TX_ENB);
+	}
+
+	ifp->if_drv_flags |= IFF_DRV_RUNNING;
+	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+	callout_reset(&sc->jme_tick_ch, hz, jme_tick, sc);
+	/* Unblock execution of task. */
+	taskqueue_unblock(sc->jme_tq);
+	/* Reenable interrupts. */
+	CSR_WRITE_4(sc, JME_INTR_MASK_SET, JME_INTRS);
+
+	JME_UNLOCK(sc);
+}
+
+static int
+jme_intr(void *arg)
+{
+	struct jme_softc *sc;
+	uint32_t status;
+
+	sc = (struct jme_softc *)arg;
+
+	status = CSR_READ_4(sc, JME_INTR_REQ_STATUS);
+	if (status == 0 || status == 0xFFFFFFFF)
+		return (FILTER_STRAY);
+	/* Disable interrupts. */
+	CSR_WRITE_4(sc, JME_INTR_MASK_CLR, JME_INTRS);
+	taskqueue_enqueue(sc->jme_tq, &sc->jme_int_task);
+
+	return (FILTER_HANDLED);
+}
+
+static void
+jme_int_task(void *arg, int pending)
+{
+	struct jme_softc *sc;
+	struct ifnet *ifp;
+	uint32_t status;
+	int more;
+
+	sc = (struct jme_softc *)arg;
+	ifp = sc->jme_ifp;
+
+	status = CSR_READ_4(sc, JME_INTR_STATUS);
+	more = atomic_readandclear_int(&sc->jme_morework);
+	if (more != 0) {
+		status |= INTR_RXQ_COAL | INTR_RXQ_COAL_TO;
+		more = 0;
+	}
+	if ((status & JME_INTRS) == 0 || status == 0xFFFFFFFF)
+		goto done;
+	/* Reset PCC counter/timer and Ack interrupts. */
+	status &= ~(INTR_TXQ_COMP | INTR_RXQ_COMP);
+	if ((status & (INTR_TXQ_COAL | INTR_TXQ_COAL_TO)) != 0)
+		status |= INTR_TXQ_COAL | INTR_TXQ_COAL_TO | INTR_TXQ_COMP;
+	if ((status & (INTR_RXQ_COAL | INTR_RXQ_COAL_TO)) != 0)
+		status |= INTR_RXQ_COAL | INTR_RXQ_COAL_TO | INTR_RXQ_COMP;
+	CSR_WRITE_4(sc, JME_INTR_STATUS, status);
+	more = 0;
+	if ((ifp->if_drv_flags & IFF_DRV_RUNNING) != 0) {
+		if ((status & (INTR_RXQ_COAL | INTR_RXQ_COAL_TO)) != 0) {
+			more = jme_rxintr(sc, sc->jme_process_limit);
+			if (more != 0)
+				atomic_set_int(&sc->jme_morework, 1);
+		}
+		if ((status & INTR_RXQ_DESC_EMPTY) != 0) {
+			/*
+			 * Notify hardware availability of new Rx
+			 * buffers.
+			 * Reading RXCSR takes very long time under
+			 * heavy load so cache RXCSR value and writes
+			 * the ORed value with the kick command to
+			 * the RXCSR. This saves one register access
+			 * cycle.
+			 */
+			CSR_WRITE_4(sc, JME_RXCSR, sc->jme_rxcsr |
+			    RXCSR_RX_ENB | RXCSR_RXQ_START);
+		}
+		/*
+		 * Reclaiming Tx buffers are deferred to make jme(4) run
+		 * without locks held.
+		 */
+		if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+			taskqueue_enqueue(sc->jme_tq, &sc->jme_tx_task);
+	}
+
+	if (more != 0 || (CSR_READ_4(sc, JME_INTR_STATUS) & JME_INTRS) != 0) {
+		taskqueue_enqueue(sc->jme_tq, &sc->jme_int_task);
+		return;
+	}
+done:
+	/* Reenable interrupts. */
+	CSR_WRITE_4(sc, JME_INTR_MASK_SET, JME_INTRS);
+}
+
+static void
+jme_txeof(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	struct jme_txdesc *txd;
+	uint32_t status;
+	int cons, nsegs;
+
+	JME_LOCK_ASSERT(sc);
+
+	ifp = sc->jme_ifp;
+
+	cons = sc->jme_cdata.jme_tx_cons;
+	if (cons == sc->jme_cdata.jme_tx_prod)
+		return;
+
+	bus_dmamap_sync(sc->jme_cdata.jme_tx_ring_tag,
+	    sc->jme_cdata.jme_tx_ring_map,
+	    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+
+	/*
+	 * Go through our Tx list and free mbufs for those
+	 * frames which have been transmitted.
+	 */
+	for (; cons != sc->jme_cdata.jme_tx_prod;) {
+		txd = &sc->jme_cdata.jme_txdesc[cons];
+		status = le32toh(txd->tx_desc->flags);
+		if ((status & JME_TD_OWN) == JME_TD_OWN)
+			break;
+
+		if ((status & (JME_TD_TMOUT | JME_TD_RETRY_EXP)) != 0)
+			ifp->if_oerrors++;
+		else {
+			ifp->if_opackets++;
+			if ((status & JME_TD_COLLISION) != 0)
+				ifp->if_collisions +=
+				    le32toh(txd->tx_desc->buflen) &
+				    JME_TD_BUF_LEN_MASK;
+		}
+		/*
+		 * Only the first descriptor of multi-descriptor
+		 * transmission is updated so driver have to skip entire
+		 * chained buffers for the transmiited frame. In other
+		 * words, JME_TD_OWN bit is valid only at the first
+		 * descriptor of a multi-descriptor transmission.
+		 */
+		for (nsegs = 0; nsegs < txd->tx_ndesc; nsegs++) {
+			sc->jme_rdata.jme_tx_ring[cons].flags = 0;
+			JME_DESC_INC(cons, JME_TX_RING_CNT);
+		}
+
+		/* Reclaim transferred mbufs. */
+		bus_dmamap_sync(sc->jme_cdata.jme_tx_tag, txd->tx_dmamap,
+		    BUS_DMASYNC_POSTWRITE);
+		bus_dmamap_unload(sc->jme_cdata.jme_tx_tag, txd->tx_dmamap);
+
+		KASSERT(txd->tx_m != NULL,
+		    ("%s: freeing NULL mbuf!\n", __func__));
+		m_freem(txd->tx_m);
+		txd->tx_m = NULL;
+		sc->jme_cdata.jme_tx_cnt -= txd->tx_ndesc;
+		KASSERT(sc->jme_cdata.jme_tx_cnt >= 0,
+		    ("%s: Active Tx desc counter was garbled\n", __func__));
+		txd->tx_ndesc = 0;
+		ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+	}
+	sc->jme_cdata.jme_tx_cons = cons;
+	/* Unarm watchog timer when there is no pending descriptors in queue. */
+	if (sc->jme_cdata.jme_tx_cnt == 0)
+		sc->jme_watchdog_timer = 0;
+
+	bus_dmamap_sync(sc->jme_cdata.jme_tx_ring_tag,
+	    sc->jme_cdata.jme_tx_ring_map,
+	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+}
+
+static __inline void
+jme_discard_rxbuf(struct jme_softc *sc, int cons)
+{
+	struct jme_desc *desc;
+
+	desc = &sc->jme_rdata.jme_rx_ring[cons];
+	desc->flags = htole32(JME_RD_OWN | JME_RD_INTR | JME_RD_64BIT);
+	desc->buflen = htole32(MCLBYTES);
+}
+
+/* Receive a frame. */
+static void
+jme_rxeof(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	struct jme_desc *desc;
+	struct jme_rxdesc *rxd;
+	struct mbuf *mp, *m;
+	uint32_t flags, status;
+	int cons, count, nsegs;
+
+	ifp = sc->jme_ifp;
+
+	cons = sc->jme_cdata.jme_rx_cons;
+	desc = &sc->jme_rdata.jme_rx_ring[cons];
+	flags = le32toh(desc->flags);
+	status = le32toh(desc->buflen);
+	nsegs = JME_RX_NSEGS(status);
+	sc->jme_cdata.jme_rxlen = JME_RX_BYTES(status) - JME_RX_PAD_BYTES;
+	if ((status & JME_RX_ERR_STAT) != 0) {
+		ifp->if_ierrors++;
+		jme_discard_rxbuf(sc, sc->jme_cdata.jme_rx_cons);
+#ifdef JME_SHOW_ERRORS
+		device_printf(sc->jme_dev, "%s : receive error = 0x%b\n",
+		    __func__, JME_RX_ERR(status), JME_RX_ERR_BITS);
+#endif
+		sc->jme_cdata.jme_rx_cons += nsegs;
+		sc->jme_cdata.jme_rx_cons %= JME_RX_RING_CNT;
+		return;
+	}
+
+	for (count = 0; count < nsegs; count++,
+	    JME_DESC_INC(cons, JME_RX_RING_CNT)) {
+		rxd = &sc->jme_cdata.jme_rxdesc[cons];
+		mp = rxd->rx_m;
+		/* Add a new receive buffer to the ring. */
+		if (jme_newbuf(sc, rxd) != 0) {
+			ifp->if_iqdrops++;
+			/* Reuse buffer. */
+			jme_discard_rxbuf(sc, sc->jme_cdata.jme_rx_cons);
+			if (sc->jme_cdata.jme_rxhead != NULL) {
+				m_freem(sc->jme_cdata.jme_rxhead);
+				JME_RXCHAIN_RESET(sc);
+			}
+			break;
+		}
+
+		/*
+		 * Assume we've received a full sized frame.
+		 * Actual size is fixed when we encounter the end of
+		 * multi-segmented frame.
+		 */
+		mp->m_len = MCLBYTES;
+
+		/* Chain received mbufs. */
+		if (sc->jme_cdata.jme_rxhead == NULL) {
+			sc->jme_cdata.jme_rxhead = mp;
+			sc->jme_cdata.jme_rxtail = mp;
+		} else {
+			/*
+			 * Receive processor can receive a maximum frame
+			 * size of 65535 bytes.
+			 */
+			mp->m_flags &= ~M_PKTHDR;
+			sc->jme_cdata.jme_rxtail->m_next = mp;
+			sc->jme_cdata.jme_rxtail = mp;
+		}
+
+		if (count == nsegs - 1) {
+			/* Last desc. for this frame. */
+			m = sc->jme_cdata.jme_rxhead;
+			m->m_flags |= M_PKTHDR;
+			m->m_pkthdr.len = sc->jme_cdata.jme_rxlen;
+			if (nsegs > 1) {
+				/* Set first mbuf size. */
+				m->m_len = MCLBYTES - JME_RX_PAD_BYTES;
+				/* Set last mbuf size. */
+				mp->m_len = sc->jme_cdata.jme_rxlen -
+				    ((MCLBYTES - JME_RX_PAD_BYTES) +
+				    (MCLBYTES * (nsegs - 2)));
+			} else
+				m->m_len = sc->jme_cdata.jme_rxlen;
+			m->m_pkthdr.rcvif = ifp;
+
+			/*
+			 * Account for 10bytes auto padding which is used
+			 * to align IP header on 32bit boundary. Also note,
+			 * CRC bytes is automatically removed by the
+			 * hardware.
+			 */
+			m->m_data += JME_RX_PAD_BYTES;
+
+			/* Set checksum information. */
+			if ((ifp->if_capenable & IFCAP_RXCSUM) != 0 &&
+			    (flags & JME_RD_IPV4) != 0) {
+				m->m_pkthdr.csum_flags |= CSUM_IP_CHECKED;
+				if ((flags & JME_RD_IPCSUM) != 0)
+					m->m_pkthdr.csum_flags |= CSUM_IP_VALID;
+				if (((flags & JME_RD_MORE_FRAG) == 0) &&
+				    ((flags & (JME_RD_TCP | JME_RD_TCPCSUM)) ==
+				    (JME_RD_TCP | JME_RD_TCPCSUM) ||
+				    (flags & (JME_RD_UDP | JME_RD_UDPCSUM)) ==
+				    (JME_RD_UDP | JME_RD_UDPCSUM))) {
+					m->m_pkthdr.csum_flags |=
+					    CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+					m->m_pkthdr.csum_data = 0xffff;
+				}
+			}
+
+			/* Check for VLAN tagged packets. */
+			if ((ifp->if_capenable & IFCAP_VLAN_HWTAGGING) != 0 &&
+			    (flags & JME_RD_VLAN_TAG) != 0) {
+				m->m_pkthdr.ether_vtag =
+				    flags & JME_RD_VLAN_MASK;
+				m->m_flags |= M_VLANTAG;
+			}
+
+			ifp->if_ipackets++;
+			/* Pass it on. */
+			(*ifp->if_input)(ifp, m);
+
+			/* Reset mbuf chains. */
+			JME_RXCHAIN_RESET(sc);
+		}
+	}
+
+	sc->jme_cdata.jme_rx_cons += nsegs;
+	sc->jme_cdata.jme_rx_cons %= JME_RX_RING_CNT;
+}
+
+static int
+jme_rxintr(struct jme_softc *sc, int count)
+{
+	struct jme_desc *desc;
+	int nsegs, prog, pktlen;
+
+	bus_dmamap_sync(sc->jme_cdata.jme_rx_ring_tag,
+	    sc->jme_cdata.jme_rx_ring_map,
+	    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
+
+	for (prog = 0; count > 0; prog++) {
+		desc = &sc->jme_rdata.jme_rx_ring[sc->jme_cdata.jme_rx_cons];
+		if ((le32toh(desc->flags) & JME_RD_OWN) == JME_RD_OWN)
+			break;
+		if ((le32toh(desc->buflen) & JME_RD_VALID) == 0)
+			break;
+		nsegs = JME_RX_NSEGS(le32toh(desc->buflen));
+		/*
+		 * Check number of segments against received bytes.
+		 * Non-matching value would indicate that hardware
+		 * is still trying to update Rx descriptors. I'm not
+		 * sure whether this check is needed.
+		 */
+		pktlen = JME_RX_BYTES(le32toh(desc->buflen));
+		if (nsegs != ((pktlen + (MCLBYTES - 1)) / MCLBYTES))
+			break;
+		prog++;
+		/* Received a frame. */
+		jme_rxeof(sc);
+		count -= nsegs;
+	}
+
+	if (prog > 0)
+		bus_dmamap_sync(sc->jme_cdata.jme_rx_ring_tag,
+		    sc->jme_cdata.jme_rx_ring_map,
+		    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+
+	return (count > 0 ? 0 : EAGAIN);
+}
+
+static void
+jme_tick(void *arg)
+{
+	struct jme_softc *sc;
+	struct mii_data *mii;
+
+	sc = (struct jme_softc *)arg;
+
+	JME_LOCK_ASSERT(sc);
+
+	mii = device_get_softc(sc->jme_miibus);
+	mii_tick(mii);
+	/*
+	 * Reclaim Tx buffers that have been completed. It's not
+	 * needed here but it would release allocated mbuf chains
+	 * faster and limit the maximum delay to a hz.
+	 */
+	jme_txeof(sc);
+	jme_watchdog(sc);
+	callout_reset(&sc->jme_tick_ch, hz, jme_tick, sc);
+}
+
+static void
+jme_reset(struct jme_softc *sc)
+{
+
+	/* Stop receiver, transmitter. */
+	jme_stop_rx(sc);
+	jme_stop_tx(sc);
+	CSR_WRITE_4(sc, JME_GHC, GHC_RESET);
+	DELAY(10);
+	CSR_WRITE_4(sc, JME_GHC, 0);
+}
+
+static void
+jme_init(void *xsc)
+{
+	struct jme_softc *sc;
+
+	sc = (struct jme_softc *)xsc;
+	JME_LOCK(sc);
+	jme_init_locked(sc);
+	JME_UNLOCK(sc);
+}
+
+static void
+jme_init_locked(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	struct mii_data *mii;
+	uint8_t eaddr[ETHER_ADDR_LEN];
+	bus_addr_t paddr;
+	uint32_t reg;
+	int error;
+
+	JME_LOCK_ASSERT(sc);
+
+	ifp = sc->jme_ifp;
+	mii = device_get_softc(sc->jme_miibus);
+
+	/*
+	 * Cancel any pending I/O.
+	 */
+	jme_stop(sc);
+
+	/*
+	 * Reset the chip to a known state.
+	 */
+	jme_reset(sc);
+
+	/* Init descriptors. */
+	error = jme_init_rx_ring(sc);
+        if (error != 0) {
+                device_printf(sc->jme_dev,
+                    "%s: initialization failed: no memory for Rx buffers.\n",
+		    __func__);
+                jme_stop(sc);
+		return;
+        }
+	jme_init_tx_ring(sc);
+	/* Initialize shadow status block. */
+	jme_init_ssb(sc);
+
+	/* Reprogram the station address. */
+	bcopy(IF_LLADDR(ifp), eaddr, ETHER_ADDR_LEN);
+	CSR_WRITE_4(sc, JME_PAR0,
+	    eaddr[3] << 24 | eaddr[2] << 16 | eaddr[1] << 8 | eaddr[0]);
+	CSR_WRITE_4(sc, JME_PAR1, eaddr[5] << 8 | eaddr[4]);
+
+	/*
+	 * Configure Tx queue.
+	 *  Tx priority queue weight value : 0
+	 *  Tx FIFO threshold for processing next packet : 16QW
+	 *  Maximum Tx DMA length : 512
+	 *  Allow Tx DMA burst.
+	 */
+	sc->jme_txcsr = TXCSR_TXQ_N_SEL(TXCSR_TXQ0);
+	sc->jme_txcsr |= TXCSR_TXQ_WEIGHT(TXCSR_TXQ_WEIGHT_MIN);
+	sc->jme_txcsr |= TXCSR_FIFO_THRESH_16QW;
+	sc->jme_txcsr |= sc->jme_tx_dma_size;
+	sc->jme_txcsr |= TXCSR_DMA_BURST;
+	CSR_WRITE_4(sc, JME_TXCSR, sc->jme_txcsr);
+
+	/* Set Tx descriptor counter. */
+	CSR_WRITE_4(sc, JME_TXQDC, JME_TX_RING_CNT);
+
+	/* Set Tx ring address to the hardware. */
+	paddr = JME_TX_RING_ADDR(sc, 0);
+	CSR_WRITE_4(sc, JME_TXDBA_HI, JME_ADDR_HI(paddr));
+	CSR_WRITE_4(sc, JME_TXDBA_LO, JME_ADDR_LO(paddr));
+
+	/* Configure TxMAC parameters. */
+	reg = TXMAC_IFG1_DEFAULT | TXMAC_IFG2_DEFAULT | TXMAC_IFG_ENB;
+	reg |= TXMAC_THRESH_1_PKT;
+	reg |= TXMAC_CRC_ENB | TXMAC_PAD_ENB;
+	CSR_WRITE_4(sc, JME_TXMAC, reg);
+
+	/*
+	 * Configure Rx queue.
+	 *  FIFO full threshold for transmitting Tx pause packet : 128T
+	 *  FIFO threshold for processing next packet : 128QW
+	 *  Rx queue 0 select
+	 *  Max Rx DMA length : 128
+	 *  Rx descriptor retry : 32
+	 *  Rx descriptor retry time gap : 256ns
+	 *  Don't receive runt/bad frame.
+	 */
+	sc->jme_rxcsr = RXCSR_FIFO_FTHRESH_128T;
+	/*
+	 * Since Rx FIFO size is 4K bytes, receiving frames larger
+	 * than 4K bytes will suffer from Rx FIFO overruns. So
+	 * decrease FIFO threshold to reduce the FIFO overruns for
+	 * frames larger than 4000 bytes.
+	 * For best performance of standard MTU sized frames use
+	 * maximum allowable FIFO threshold, 128QW.
+	 */
+	if ((ifp->if_mtu + ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN +
+	    ETHER_CRC_LEN) > JME_RX_FIFO_SIZE)
+		sc->jme_rxcsr |= RXCSR_FIFO_THRESH_16QW;
+	else
+		sc->jme_rxcsr |= RXCSR_FIFO_THRESH_128QW;
+	sc->jme_rxcsr |= sc->jme_rx_dma_size | RXCSR_RXQ_N_SEL(RXCSR_RXQ0);
+	sc->jme_rxcsr |= RXCSR_DESC_RT_CNT(RXCSR_DESC_RT_CNT_DEFAULT);
+	sc->jme_rxcsr |= RXCSR_DESC_RT_GAP_256 & RXCSR_DESC_RT_GAP_MASK;
+	CSR_WRITE_4(sc, JME_RXCSR, sc->jme_rxcsr);
+
+	/* Set Rx descriptor counter. */
+	CSR_WRITE_4(sc, JME_RXQDC, JME_RX_RING_CNT);
+
+	/* Set Rx ring address to the hardware. */
+	paddr = JME_RX_RING_ADDR(sc, 0);
+	CSR_WRITE_4(sc, JME_RXDBA_HI, JME_ADDR_HI(paddr));
+	CSR_WRITE_4(sc, JME_RXDBA_LO, JME_ADDR_LO(paddr));
+
+	/* Clear receive filter. */
+	CSR_WRITE_4(sc, JME_RXMAC, 0);
+	/* Set up the receive filter. */
+	jme_set_filter(sc);
+	jme_set_vlan(sc);
+
+	/*
+	 * Disable all WOL bits as WOL can interfere normal Rx
+	 * operation. Also clear WOL detection status bits.
+	 */
+	reg = CSR_READ_4(sc, JME_PMCS);
+	reg &= ~PMCS_WOL_ENB_MASK;
+	CSR_WRITE_4(sc, JME_PMCS, reg);
+
+	reg = CSR_READ_4(sc, JME_RXMAC);
+	/*
+	 * Pad 10bytes right before received frame. This will greatly
+	 * help Rx performance on strict-alignment architectures as
+	 * it does not need to copy the frame to align the payload.
+	 */
+	reg |= RXMAC_PAD_10BYTES;
+	if ((ifp->if_capenable & IFCAP_RXCSUM) != 0)
+		reg |= RXMAC_CSUM_ENB;
+	CSR_WRITE_4(sc, JME_RXMAC, reg);
+
+	/* Configure general purpose reg0 */
+	reg = CSR_READ_4(sc, JME_GPREG0);
+	reg &= ~GPREG0_PCC_UNIT_MASK;
+	/* Set PCC timer resolution to micro-seconds unit. */
+	reg |= GPREG0_PCC_UNIT_US;
+	/*
+	 * Disable all shadow register posting as we have to read
+	 * JME_INTR_STATUS register in jme_int_task. Also it seems
+	 * that it's hard to synchronize interrupt status between
+	 * hardware and software with shadow posting due to
+	 * requirements of bus_dmamap_sync(9).
+	 */
+	reg |= GPREG0_SH_POST_DW7_DIS | GPREG0_SH_POST_DW6_DIS |
+	    GPREG0_SH_POST_DW5_DIS | GPREG0_SH_POST_DW4_DIS |
+	    GPREG0_SH_POST_DW3_DIS | GPREG0_SH_POST_DW2_DIS |
+	    GPREG0_SH_POST_DW1_DIS | GPREG0_SH_POST_DW0_DIS;
+	/* Disable posting of DW0. */
+	reg &= ~GPREG0_POST_DW0_ENB;
+	/* Clear PME message. */
+	reg &= ~GPREG0_PME_ENB;
+	/* Set PHY address. */
+	reg &= ~GPREG0_PHY_ADDR_MASK;
+	reg |= sc->jme_phyaddr;
+	CSR_WRITE_4(sc, JME_GPREG0, reg);
+
+	/* Configure Tx queue 0 packet completion coalescing. */
+	reg = (sc->jme_tx_coal_to << PCCTX_COAL_TO_SHIFT) &
+	    PCCTX_COAL_TO_MASK;
+	reg |= (sc->jme_tx_coal_pkt << PCCTX_COAL_PKT_SHIFT) &
+	    PCCTX_COAL_PKT_MASK;
+	reg |= PCCTX_COAL_TXQ0;
+	CSR_WRITE_4(sc, JME_PCCTX, reg);
+
+	/* Configure Rx queue 0 packet completion coalescing. */
+	reg = (sc->jme_rx_coal_to << PCCRX_COAL_TO_SHIFT) &
+	    PCCRX_COAL_TO_MASK;
+	reg |= (sc->jme_rx_coal_pkt << PCCRX_COAL_PKT_SHIFT) &
+	    PCCRX_COAL_PKT_MASK;
+	CSR_WRITE_4(sc, JME_PCCRX0, reg);
+
+	/* Configure shadow status block but don't enable posting. */
+	paddr = sc->jme_rdata.jme_ssb_block_paddr;
+	CSR_WRITE_4(sc, JME_SHBASE_ADDR_HI, JME_ADDR_HI(paddr));
+	CSR_WRITE_4(sc, JME_SHBASE_ADDR_LO, JME_ADDR_LO(paddr));
+
+	/* Disable Timer 1 and Timer 2. */
+	CSR_WRITE_4(sc, JME_TIMER1, 0);
+	CSR_WRITE_4(sc, JME_TIMER2, 0);
+
+	/* Configure retry transmit period, retry limit value. */
+	CSR_WRITE_4(sc, JME_TXTRHD,
+	    ((TXTRHD_RT_PERIOD_DEFAULT << TXTRHD_RT_PERIOD_SHIFT) &
+	    TXTRHD_RT_PERIOD_MASK) |
+	    ((TXTRHD_RT_LIMIT_DEFAULT << TXTRHD_RT_LIMIT_SHIFT) &
+	    TXTRHD_RT_LIMIT_SHIFT));
+
+	/* Disable RSS. */
+	CSR_WRITE_4(sc, JME_RSSC, RSSC_DIS_RSS);
+
+	/* Initialize the interrupt mask. */
+	CSR_WRITE_4(sc, JME_INTR_MASK_SET, JME_INTRS);
+	CSR_WRITE_4(sc, JME_INTR_STATUS, 0xFFFFFFFF);
+
+	/*
+	 * Enabling Tx/Rx DMA engines and Rx queue processing is
+	 * done after detection of valid link in jme_link_task.
+	 */
+
+	sc->jme_flags &= ~JME_FLAG_LINK;
+	/* Set the current media. */
+	mii_mediachg(mii);
+
+	callout_reset(&sc->jme_tick_ch, hz, jme_tick, sc);
+
+	ifp->if_drv_flags |= IFF_DRV_RUNNING;
+	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+}
+
+static void
+jme_stop(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	struct jme_txdesc *txd;
+	struct jme_rxdesc *rxd;
+	int i;
+
+	JME_LOCK_ASSERT(sc);
+	/*
+	 * Mark the interface down and cancel the watchdog timer.
+	 */
+	ifp = sc->jme_ifp;
+	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING | IFF_DRV_OACTIVE);
+	sc->jme_flags &= ~JME_FLAG_LINK;
+	callout_stop(&sc->jme_tick_ch);
+	sc->jme_watchdog_timer = 0;
+
+	/*
+	 * Disable interrupts.
+	 */
+	CSR_WRITE_4(sc, JME_INTR_MASK_CLR, JME_INTRS);
+	CSR_WRITE_4(sc, JME_INTR_STATUS, 0xFFFFFFFF);
+
+	/* Disable updating shadow status block. */
+	CSR_WRITE_4(sc, JME_SHBASE_ADDR_LO,
+	    CSR_READ_4(sc, JME_SHBASE_ADDR_LO) & ~SHBASE_POST_ENB);
+
+	/* Stop receiver, transmitter. */
+	jme_stop_rx(sc);
+	jme_stop_tx(sc);
+
+	 /* Reclaim Rx/Tx buffers that have been completed. */
+	jme_rxintr(sc, JME_RX_RING_CNT);
+	if (sc->jme_cdata.jme_rxhead != NULL)
+		m_freem(sc->jme_cdata.jme_rxhead);
+	JME_RXCHAIN_RESET(sc);
+	jme_txeof(sc);
+	/*
+	 * Free RX and TX mbufs still in the queues.
+	 */
+	for (i = 0; i < JME_RX_RING_CNT; i++) {
+		rxd = &sc->jme_cdata.jme_rxdesc[i];
+		if (rxd->rx_m != NULL) {
+			bus_dmamap_sync(sc->jme_cdata.jme_rx_tag,
+			    rxd->rx_dmamap, BUS_DMASYNC_POSTREAD);
+			bus_dmamap_unload(sc->jme_cdata.jme_rx_tag,
+			    rxd->rx_dmamap);
+			m_freem(rxd->rx_m);
+			rxd->rx_m = NULL;
+		}
+        }
+	for (i = 0; i < JME_TX_RING_CNT; i++) {
+		txd = &sc->jme_cdata.jme_txdesc[i];
+		if (txd->tx_m != NULL) {
+			bus_dmamap_sync(sc->jme_cdata.jme_tx_tag,
+			    txd->tx_dmamap, BUS_DMASYNC_POSTWRITE);
+			bus_dmamap_unload(sc->jme_cdata.jme_tx_tag,
+			    txd->tx_dmamap);
+			m_freem(txd->tx_m);
+			txd->tx_m = NULL;
+			txd->tx_ndesc = 0;
+		}
+        }
+}
+
+static void
+jme_stop_tx(struct jme_softc *sc)
+{
+	uint32_t reg;
+	int i;
+
+	reg = CSR_READ_4(sc, JME_TXCSR);
+	if ((reg & TXCSR_TX_ENB) == 0)
+		return;
+	reg &= ~TXCSR_TX_ENB;
+	CSR_WRITE_4(sc, JME_TXCSR, reg);
+	for (i = JME_TIMEOUT; i > 0; i--) {
+		DELAY(1);
+		if ((CSR_READ_4(sc, JME_TXCSR) & TXCSR_TX_ENB) == 0)
+			break;
+	}
+	if (i == 0)
+		device_printf(sc->jme_dev, "stopping transmitter timeout!\n");
+}
+
+static void
+jme_stop_rx(struct jme_softc *sc)
+{
+	uint32_t reg;
+	int i;
+
+	reg = CSR_READ_4(sc, JME_RXCSR);
+	if ((reg & RXCSR_RX_ENB) == 0)
+		return;
+	reg &= ~RXCSR_RX_ENB;
+	CSR_WRITE_4(sc, JME_RXCSR, reg);
+	for (i = JME_TIMEOUT; i > 0; i--) {
+		DELAY(1);
+		if ((CSR_READ_4(sc, JME_RXCSR) & RXCSR_RX_ENB) == 0)
+			break;
+	}
+	if (i == 0)
+		device_printf(sc->jme_dev, "stopping recevier timeout!\n");
+}
+
+static void
+jme_init_tx_ring(struct jme_softc *sc)
+{
+	struct jme_ring_data *rd;
+	struct jme_txdesc *txd;
+	int i;
+
+	sc->jme_cdata.jme_tx_prod = 0;
+	sc->jme_cdata.jme_tx_cons = 0;
+	sc->jme_cdata.jme_tx_cnt = 0;
+
+	rd = &sc->jme_rdata;
+	bzero(rd->jme_tx_ring, JME_TX_RING_SIZE);
+	for (i = 0; i < JME_TX_RING_CNT; i++) {
+		txd = &sc->jme_cdata.jme_txdesc[i];
+		txd->tx_m = NULL;
+		txd->tx_desc = &rd->jme_tx_ring[i];
+		txd->tx_ndesc = 0;
+	}
+
+	bus_dmamap_sync(sc->jme_cdata.jme_tx_ring_tag,
+	    sc->jme_cdata.jme_tx_ring_map,
+	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+}
+
+static void
+jme_init_ssb(struct jme_softc *sc)
+{
+	struct jme_ring_data *rd;
+
+	rd = &sc->jme_rdata;
+	bzero(rd->jme_ssb_block, JME_SSB_SIZE);
+	bus_dmamap_sync(sc->jme_cdata.jme_ssb_tag, sc->jme_cdata.jme_ssb_map,
+	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+}
+
+static int
+jme_init_rx_ring(struct jme_softc *sc)
+{
+	struct jme_ring_data *rd;
+	struct jme_rxdesc *rxd;
+	int i;
+
+	sc->jme_cdata.jme_rx_cons = 0;
+	JME_RXCHAIN_RESET(sc);
+	atomic_set_int(&sc->jme_morework, 0);
+
+	rd = &sc->jme_rdata;
+	bzero(rd->jme_rx_ring, JME_RX_RING_SIZE);
+	for (i = 0; i < JME_RX_RING_CNT; i++) {
+		rxd = &sc->jme_cdata.jme_rxdesc[i];
+		rxd->rx_m = NULL;
+		rxd->rx_desc = &rd->jme_rx_ring[i];
+		if (jme_newbuf(sc, rxd) != 0)
+			return (ENOBUFS);
+	}
+
+	bus_dmamap_sync(sc->jme_cdata.jme_rx_ring_tag,
+	    sc->jme_cdata.jme_rx_ring_map,
+	    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
+
+	return (0);
+}
+
+static int
+jme_newbuf(struct jme_softc *sc, struct jme_rxdesc *rxd)
+{
+	struct jme_desc *desc;
+	struct mbuf *m;
+	bus_dma_segment_t segs[1];
+	bus_dmamap_t map;
+	int nsegs;
+
+	m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
+	if (m == NULL)
+		return (ENOBUFS);
+	/*
+	 * JMC250 has 64bit boundary alignment limitation so jme(4)
+	 * takes advantage of 10 bytes padding feature of hardware
+	 * in order not to copy entire frame to align IP header on
+	 * 32bit boundary.
+	 */
+	m->m_len = m->m_pkthdr.len = MCLBYTES;
+
+	if (bus_dmamap_load_mbuf_sg(sc->jme_cdata.jme_rx_tag,
+	    sc->jme_cdata.jme_rx_sparemap, m, segs, &nsegs, 0) != 0) {
+		m_freem(m);
+		return (ENOBUFS);
+	}
+	KASSERT(nsegs == 1, ("%s: %d segments returned!", __func__, nsegs));
+
+	if (rxd->rx_m != NULL) {
+		bus_dmamap_sync(sc->jme_cdata.jme_rx_tag, rxd->rx_dmamap,
+		    BUS_DMASYNC_POSTREAD);
+		bus_dmamap_unload(sc->jme_cdata.jme_rx_tag, rxd->rx_dmamap);
+	}
+	map = rxd->rx_dmamap;
+	rxd->rx_dmamap = sc->jme_cdata.jme_rx_sparemap;
+	sc->jme_cdata.jme_rx_sparemap = map;
+	bus_dmamap_sync(sc->jme_cdata.jme_rx_tag, rxd->rx_dmamap,
+	    BUS_DMASYNC_PREREAD);
+	rxd->rx_m = m;
+
+	desc = rxd->rx_desc;
+	desc->buflen = htole32(segs[0].ds_len);
+	desc->addr_lo = htole32(JME_ADDR_LO(segs[0].ds_addr));
+	desc->addr_hi = htole32(JME_ADDR_HI(segs[0].ds_addr));
+	desc->flags = htole32(JME_RD_OWN | JME_RD_INTR | JME_RD_64BIT);
+
+	return (0);
+}
+
+static void
+jme_set_vlan(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	uint32_t reg;
+
+	JME_LOCK_ASSERT(sc);
+
+	ifp = sc->jme_ifp;
+	reg = CSR_READ_4(sc, JME_RXMAC);
+	reg &= ~RXMAC_VLAN_ENB;
+	if ((ifp->if_capenable & IFCAP_VLAN_HWTAGGING) != 0)
+		reg |= RXMAC_VLAN_ENB;
+	CSR_WRITE_4(sc, JME_RXMAC, reg);
+}
+
+static void
+jme_set_filter(struct jme_softc *sc)
+{
+	struct ifnet *ifp;
+	struct ifmultiaddr *ifma;
+	uint32_t crc;
+	uint32_t mchash[2];
+	uint32_t rxcfg;
+
+	JME_LOCK_ASSERT(sc);
+
+	ifp = sc->jme_ifp;
+
+	rxcfg = CSR_READ_4(sc, JME_RXMAC);
+	rxcfg &= ~ (RXMAC_BROADCAST | RXMAC_PROMISC | RXMAC_MULTICAST |
+	    RXMAC_ALLMULTI);
+	/* Always accept frames destined to our station address. */
+	rxcfg |= RXMAC_UNICAST;
+	if ((ifp->if_flags & IFF_BROADCAST) != 0)
+		rxcfg |= RXMAC_BROADCAST;
+	if ((ifp->if_flags & (IFF_PROMISC | IFF_ALLMULTI)) != 0) {
+		if ((ifp->if_flags & IFF_PROMISC) != 0)
+			rxcfg |= RXMAC_PROMISC;
+		if ((ifp->if_flags & IFF_ALLMULTI) != 0)
+			rxcfg |= RXMAC_ALLMULTI;
+		CSR_WRITE_4(sc, JME_MAR0, 0xFFFFFFFF);
+		CSR_WRITE_4(sc, JME_MAR1, 0xFFFFFFFF);
+		CSR_WRITE_4(sc, JME_RXMAC, rxcfg);
+		return;
+	}
+
+	/*
+	 * Set up the multicast address filter by passing all multicast
+	 * addresses through a CRC generator, and then using the low-order
+	 * 6 bits as an index into the 64 bit multicast hash table.  The
+	 * high order bits select the register, while the rest of the bits
+	 * select the bit within the register.
+	 */
+	rxcfg |= RXMAC_MULTICAST;
+	bzero(mchash, sizeof(mchash));
+
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifma, &sc->jme_ifp->if_multiaddrs, ifma_link) {
+		if (ifma->ifma_addr->sa_family != AF_LINK)
+			continue;
+		crc = ether_crc32_be(LLADDR((struct sockaddr_dl *)
+		    ifma->ifma_addr), ETHER_ADDR_LEN);
+
+		/* Just want the 6 least significant bits. */
+		crc &= 0x3f;
+
+		/* Set the corresponding bit in the hash table. */
+		mchash[crc >> 5] |= 1 << (crc & 0x1f);
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	CSR_WRITE_4(sc, JME_MAR0, mchash[0]);
+	CSR_WRITE_4(sc, JME_MAR1, mchash[1]);
+	CSR_WRITE_4(sc, JME_RXMAC, rxcfg);
+}
+
+static int
+sysctl_int_range(SYSCTL_HANDLER_ARGS, int low, int high)
+{
+	int error, value;
+
+	if (arg1 == NULL)
+		return (EINVAL);
+	value = *(int *)arg1;
+	error = sysctl_handle_int(oidp, &value, 0, req);
+	if (error || req->newptr == NULL)
+		return (error);
+	if (value < low || value > high)
+		return (EINVAL);
+        *(int *)arg1 = value;
+
+        return (0);
+}
+
+static int
+sysctl_hw_jme_tx_coal_to(SYSCTL_HANDLER_ARGS)
+{
+	return (sysctl_int_range(oidp, arg1, arg2, req,
+	    PCCTX_COAL_TO_MIN, PCCTX_COAL_TO_MAX));
+}
+
+static int
+sysctl_hw_jme_tx_coal_pkt(SYSCTL_HANDLER_ARGS)
+{
+	return (sysctl_int_range(oidp, arg1, arg2, req,
+	    PCCTX_COAL_PKT_MIN, PCCTX_COAL_PKT_MAX));
+}
+
+static int
+sysctl_hw_jme_rx_coal_to(SYSCTL_HANDLER_ARGS)
+{
+	return (sysctl_int_range(oidp, arg1, arg2, req,
+	    PCCRX_COAL_TO_MIN, PCCRX_COAL_TO_MAX));
+}
+
+static int
+sysctl_hw_jme_rx_coal_pkt(SYSCTL_HANDLER_ARGS)
+{
+	return (sysctl_int_range(oidp, arg1, arg2, req,
+	    PCCRX_COAL_PKT_MIN, PCCRX_COAL_PKT_MAX));
+}
+
+static int
+sysctl_hw_jme_proc_limit(SYSCTL_HANDLER_ARGS)
+{
+	return (sysctl_int_range(oidp, arg1, arg2, req,
+	    JME_PROC_MIN, JME_PROC_MAX));
+}