hw: move target-independent files to subdirectories

This patch tackles all files that are compiled once, moving
them to subdirectories of hw/.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1404 insertions, 0 deletions

diff --git a/hw/net/e1000.c b/hw/net/e1000.c
new file mode 100644
index 0000000000..3f18041b47
--- /dev/null
+++ b/hw/net/e1000.c
@@ -0,0 +1,1404 @@
+/*
+ * QEMU e1000 emulation
+ *
+ * Software developer's manual:
+ * http://download.intel.com/design/network/manuals/8254x_GBe_SDM.pdf
+ *
+ * Nir Peleg, Tutis Systems Ltd. for Qumranet Inc.
+ * Copyright (c) 2008 Qumranet
+ * Based on work done by:
+ * Copyright (c) 2007 Dan Aloni
+ * Copyright (c) 2004 Antony T Curtis
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "hw/hw.h"
+#include "hw/pci/pci.h"
+#include "net/net.h"
+#include "net/checksum.h"
+#include "hw/loader.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/dma.h"
+
+#include "hw/e1000_hw.h"
+
+#define E1000_DEBUG
+
+#ifdef E1000_DEBUG
+enum {
+    DEBUG_GENERAL,	DEBUG_IO,	DEBUG_MMIO,	DEBUG_INTERRUPT,
+    DEBUG_RX,		DEBUG_TX,	DEBUG_MDIC,	DEBUG_EEPROM,
+    DEBUG_UNKNOWN,	DEBUG_TXSUM,	DEBUG_TXERR,	DEBUG_RXERR,
+    DEBUG_RXFILTER,     DEBUG_PHY,      DEBUG_NOTYET,
+};
+#define DBGBIT(x)	(1<<DEBUG_##x)
+static int debugflags = DBGBIT(TXERR) | DBGBIT(GENERAL);
+
+#define	DBGOUT(what, fmt, ...) do { \
+    if (debugflags & DBGBIT(what)) \
+        fprintf(stderr, "e1000: " fmt, ## __VA_ARGS__); \
+    } while (0)
+#else
+#define	DBGOUT(what, fmt, ...) do {} while (0)
+#endif
+
+#define IOPORT_SIZE       0x40
+#define PNPMMIO_SIZE      0x20000
+#define MIN_BUF_SIZE      60 /* Min. octets in an ethernet frame sans FCS */
+
+/* this is the size past which hardware will drop packets when setting LPE=0 */
+#define MAXIMUM_ETHERNET_VLAN_SIZE 1522
+/* this is the size past which hardware will drop packets when setting LPE=1 */
+#define MAXIMUM_ETHERNET_LPE_SIZE 16384
+
+/*
+ * HW models:
+ *  E1000_DEV_ID_82540EM works with Windows and Linux
+ *  E1000_DEV_ID_82573L OK with windoze and Linux 2.6.22,
+ *	appears to perform better than 82540EM, but breaks with Linux 2.6.18
+ *  E1000_DEV_ID_82544GC_COPPER appears to work; not well tested
+ *  Others never tested
+ */
+enum { E1000_DEVID = E1000_DEV_ID_82540EM };
+
+/*
+ * May need to specify additional MAC-to-PHY entries --
+ * Intel's Windows driver refuses to initialize unless they match
+ */
+enum {
+    PHY_ID2_INIT = E1000_DEVID == E1000_DEV_ID_82573L ?		0xcc2 :
+                   E1000_DEVID == E1000_DEV_ID_82544GC_COPPER ?	0xc30 :
+                   /* default to E1000_DEV_ID_82540EM */	0xc20
+};
+
+typedef struct E1000State_st {
+    PCIDevice dev;
+    NICState *nic;
+    NICConf conf;
+    MemoryRegion mmio;
+    MemoryRegion io;
+
+    uint32_t mac_reg[0x8000];
+    uint16_t phy_reg[0x20];
+    uint16_t eeprom_data[64];
+
+    uint32_t rxbuf_size;
+    uint32_t rxbuf_min_shift;
+    struct e1000_tx {
+        unsigned char header[256];
+        unsigned char vlan_header[4];
+        /* Fields vlan and data must not be reordered or separated. */
+        unsigned char vlan[4];
+        unsigned char data[0x10000];
+        uint16_t size;
+        unsigned char sum_needed;
+        unsigned char vlan_needed;
+        uint8_t ipcss;
+        uint8_t ipcso;
+        uint16_t ipcse;
+        uint8_t tucss;
+        uint8_t tucso;
+        uint16_t tucse;
+        uint8_t hdr_len;
+        uint16_t mss;
+        uint32_t paylen;
+        uint16_t tso_frames;
+        char tse;
+        int8_t ip;
+        int8_t tcp;
+        char cptse;     // current packet tse bit
+    } tx;
+
+    struct {
+        uint32_t val_in;	// shifted in from guest driver
+        uint16_t bitnum_in;
+        uint16_t bitnum_out;
+        uint16_t reading;
+        uint32_t old_eecd;
+    } eecd_state;
+
+    QEMUTimer *autoneg_timer;
+
+/* Compatibility flags for migration to/from qemu 1.3.0 and older */
+#define E1000_FLAG_AUTONEG_BIT 0
+#define E1000_FLAG_AUTONEG (1 << E1000_FLAG_AUTONEG_BIT)
+    uint32_t compat_flags;
+} E1000State;
+
+#define	defreg(x)	x = (E1000_##x>>2)
+enum {
+    defreg(CTRL),	defreg(EECD),	defreg(EERD),	defreg(GPRC),
+    defreg(GPTC),	defreg(ICR),	defreg(ICS),	defreg(IMC),
+    defreg(IMS),	defreg(LEDCTL),	defreg(MANC),	defreg(MDIC),
+    defreg(MPC),	defreg(PBA),	defreg(RCTL),	defreg(RDBAH),
+    defreg(RDBAL),	defreg(RDH),	defreg(RDLEN),	defreg(RDT),
+    defreg(STATUS),	defreg(SWSM),	defreg(TCTL),	defreg(TDBAH),
+    defreg(TDBAL),	defreg(TDH),	defreg(TDLEN),	defreg(TDT),
+    defreg(TORH),	defreg(TORL),	defreg(TOTH),	defreg(TOTL),
+    defreg(TPR),	defreg(TPT),	defreg(TXDCTL),	defreg(WUFC),
+    defreg(RA),		defreg(MTA),	defreg(CRCERRS),defreg(VFTA),
+    defreg(VET),
+};
+
+static void
+e1000_link_down(E1000State *s)
+{
+    s->mac_reg[STATUS] &= ~E1000_STATUS_LU;
+    s->phy_reg[PHY_STATUS] &= ~MII_SR_LINK_STATUS;
+}
+
+static void
+e1000_link_up(E1000State *s)
+{
+    s->mac_reg[STATUS] |= E1000_STATUS_LU;
+    s->phy_reg[PHY_STATUS] |= MII_SR_LINK_STATUS;
+}
+
+static void
+set_phy_ctrl(E1000State *s, int index, uint16_t val)
+{
+    /*
+     * QEMU 1.3 does not support link auto-negotiation emulation, so if we
+     * migrate during auto negotiation, after migration the link will be
+     * down.
+     */
+    if (!(s->compat_flags & E1000_FLAG_AUTONEG)) {
+        return;
+    }
+    if ((val & MII_CR_AUTO_NEG_EN) && (val & MII_CR_RESTART_AUTO_NEG)) {
+        e1000_link_down(s);
+        s->phy_reg[PHY_STATUS] &= ~MII_SR_AUTONEG_COMPLETE;
+        DBGOUT(PHY, "Start link auto negotiation\n");
+        qemu_mod_timer(s->autoneg_timer, qemu_get_clock_ms(vm_clock) + 500);
+    }
+}
+
+static void
+e1000_autoneg_timer(void *opaque)
+{
+    E1000State *s = opaque;
+    if (!qemu_get_queue(s->nic)->link_down) {
+        e1000_link_up(s);
+    }
+    s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
+    DBGOUT(PHY, "Auto negotiation is completed\n");
+}
+
+static void (*phyreg_writeops[])(E1000State *, int, uint16_t) = {
+    [PHY_CTRL] = set_phy_ctrl,
+};
+
+enum { NPHYWRITEOPS = ARRAY_SIZE(phyreg_writeops) };
+
+enum { PHY_R = 1, PHY_W = 2, PHY_RW = PHY_R | PHY_W };
+static const char phy_regcap[0x20] = {
+    [PHY_STATUS] = PHY_R,	[M88E1000_EXT_PHY_SPEC_CTRL] = PHY_RW,
+    [PHY_ID1] = PHY_R,		[M88E1000_PHY_SPEC_CTRL] = PHY_RW,
+    [PHY_CTRL] = PHY_RW,	[PHY_1000T_CTRL] = PHY_RW,
+    [PHY_LP_ABILITY] = PHY_R,	[PHY_1000T_STATUS] = PHY_R,
+    [PHY_AUTONEG_ADV] = PHY_RW,	[M88E1000_RX_ERR_CNTR] = PHY_R,
+    [PHY_ID2] = PHY_R,		[M88E1000_PHY_SPEC_STATUS] = PHY_R
+};
+
+static const uint16_t phy_reg_init[] = {
+    [PHY_CTRL] = 0x1140,
+    [PHY_STATUS] = 0x794d, /* link initially up with not completed autoneg */
+    [PHY_ID1] = 0x141,				[PHY_ID2] = PHY_ID2_INIT,
+    [PHY_1000T_CTRL] = 0x0e00,			[M88E1000_PHY_SPEC_CTRL] = 0x360,
+    [M88E1000_EXT_PHY_SPEC_CTRL] = 0x0d60,	[PHY_AUTONEG_ADV] = 0xde1,
+    [PHY_LP_ABILITY] = 0x1e0,			[PHY_1000T_STATUS] = 0x3c00,
+    [M88E1000_PHY_SPEC_STATUS] = 0xac00,
+};
+
+static const uint32_t mac_reg_init[] = {
+    [PBA] =     0x00100030,
+    [LEDCTL] =  0x602,
+    [CTRL] =    E1000_CTRL_SWDPIN2 | E1000_CTRL_SWDPIN0 |
+                E1000_CTRL_SPD_1000 | E1000_CTRL_SLU,
+    [STATUS] =  0x80000000 | E1000_STATUS_GIO_MASTER_ENABLE |
+                E1000_STATUS_ASDV | E1000_STATUS_MTXCKOK |
+                E1000_STATUS_SPEED_1000 | E1000_STATUS_FD |
+                E1000_STATUS_LU,
+    [MANC] =    E1000_MANC_EN_MNG2HOST | E1000_MANC_RCV_TCO_EN |
+                E1000_MANC_ARP_EN | E1000_MANC_0298_EN |
+                E1000_MANC_RMCP_EN,
+};
+
+static void
+set_interrupt_cause(E1000State *s, int index, uint32_t val)
+{
+    if (val && (E1000_DEVID >= E1000_DEV_ID_82547EI_MOBILE)) {
+        /* Only for 8257x */
+        val |= E1000_ICR_INT_ASSERTED;
+    }
+    s->mac_reg[ICR] = val;
+
+    /*
+     * Make sure ICR and ICS registers have the same value.
+     * The spec says that the ICS register is write-only.  However in practice,
+     * on real hardware ICS is readable, and for reads it has the same value as
+     * ICR (except that ICS does not have the clear on read behaviour of ICR).
+     *
+     * The VxWorks PRO/1000 driver uses this behaviour.
+     */
+    s->mac_reg[ICS] = val;
+
+    qemu_set_irq(s->dev.irq[0], (s->mac_reg[IMS] & s->mac_reg[ICR]) != 0);
+}
+
+static void
+set_ics(E1000State *s, int index, uint32_t val)
+{
+    DBGOUT(INTERRUPT, "set_ics %x, ICR %x, IMR %x\n", val, s->mac_reg[ICR],
+        s->mac_reg[IMS]);
+    set_interrupt_cause(s, 0, val | s->mac_reg[ICR]);
+}
+
+static int
+rxbufsize(uint32_t v)
+{
+    v &= E1000_RCTL_BSEX | E1000_RCTL_SZ_16384 | E1000_RCTL_SZ_8192 |
+         E1000_RCTL_SZ_4096 | E1000_RCTL_SZ_2048 | E1000_RCTL_SZ_1024 |
+         E1000_RCTL_SZ_512 | E1000_RCTL_SZ_256;
+    switch (v) {
+    case E1000_RCTL_BSEX | E1000_RCTL_SZ_16384:
+        return 16384;
+    case E1000_RCTL_BSEX | E1000_RCTL_SZ_8192:
+        return 8192;
+    case E1000_RCTL_BSEX | E1000_RCTL_SZ_4096:
+        return 4096;
+    case E1000_RCTL_SZ_1024:
+        return 1024;
+    case E1000_RCTL_SZ_512:
+        return 512;
+    case E1000_RCTL_SZ_256:
+        return 256;
+    }
+    return 2048;
+}
+
+static void e1000_reset(void *opaque)
+{
+    E1000State *d = opaque;
+    uint8_t *macaddr = d->conf.macaddr.a;
+    int i;
+
+    qemu_del_timer(d->autoneg_timer);
+    memset(d->phy_reg, 0, sizeof d->phy_reg);
+    memmove(d->phy_reg, phy_reg_init, sizeof phy_reg_init);
+    memset(d->mac_reg, 0, sizeof d->mac_reg);
+    memmove(d->mac_reg, mac_reg_init, sizeof mac_reg_init);
+    d->rxbuf_min_shift = 1;
+    memset(&d->tx, 0, sizeof d->tx);
+
+    if (qemu_get_queue(d->nic)->link_down) {
+        e1000_link_down(d);
+    }
+
+    /* Some guests expect pre-initialized RAH/RAL (AddrValid flag + MACaddr) */
+    d->mac_reg[RA] = 0;
+    d->mac_reg[RA + 1] = E1000_RAH_AV;
+    for (i = 0; i < 4; i++) {
+        d->mac_reg[RA] |= macaddr[i] << (8 * i);
+        d->mac_reg[RA + 1] |= (i < 2) ? macaddr[i + 4] << (8 * i) : 0;
+    }
+}
+
+static void
+set_ctrl(E1000State *s, int index, uint32_t val)
+{
+    /* RST is self clearing */
+    s->mac_reg[CTRL] = val & ~E1000_CTRL_RST;
+}
+
+static void
+set_rx_control(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[RCTL] = val;
+    s->rxbuf_size = rxbufsize(val);
+    s->rxbuf_min_shift = ((val / E1000_RCTL_RDMTS_QUAT) & 3) + 1;
+    DBGOUT(RX, "RCTL: %d, mac_reg[RCTL] = 0x%x\n", s->mac_reg[RDT],
+           s->mac_reg[RCTL]);
+    qemu_flush_queued_packets(qemu_get_queue(s->nic));
+}
+
+static void
+set_mdic(E1000State *s, int index, uint32_t val)
+{
+    uint32_t data = val & E1000_MDIC_DATA_MASK;
+    uint32_t addr = ((val & E1000_MDIC_REG_MASK) >> E1000_MDIC_REG_SHIFT);
+
+    if ((val & E1000_MDIC_PHY_MASK) >> E1000_MDIC_PHY_SHIFT != 1) // phy #
+        val = s->mac_reg[MDIC] | E1000_MDIC_ERROR;
+    else if (val & E1000_MDIC_OP_READ) {
+        DBGOUT(MDIC, "MDIC read reg 0x%x\n", addr);
+        if (!(phy_regcap[addr] & PHY_R)) {
+            DBGOUT(MDIC, "MDIC read reg %x unhandled\n", addr);
+            val |= E1000_MDIC_ERROR;
+        } else
+            val = (val ^ data) | s->phy_reg[addr];
+    } else if (val & E1000_MDIC_OP_WRITE) {
+        DBGOUT(MDIC, "MDIC write reg 0x%x, value 0x%x\n", addr, data);
+        if (!(phy_regcap[addr] & PHY_W)) {
+            DBGOUT(MDIC, "MDIC write reg %x unhandled\n", addr);
+            val |= E1000_MDIC_ERROR;
+        } else {
+            if (addr < NPHYWRITEOPS && phyreg_writeops[addr]) {
+                phyreg_writeops[addr](s, index, data);
+            }
+            s->phy_reg[addr] = data;
+        }
+    }
+    s->mac_reg[MDIC] = val | E1000_MDIC_READY;
+
+    if (val & E1000_MDIC_INT_EN) {
+        set_ics(s, 0, E1000_ICR_MDAC);
+    }
+}
+
+static uint32_t
+get_eecd(E1000State *s, int index)
+{
+    uint32_t ret = E1000_EECD_PRES|E1000_EECD_GNT | s->eecd_state.old_eecd;
+
+    DBGOUT(EEPROM, "reading eeprom bit %d (reading %d)\n",
+           s->eecd_state.bitnum_out, s->eecd_state.reading);
+    if (!s->eecd_state.reading ||
+        ((s->eeprom_data[(s->eecd_state.bitnum_out >> 4) & 0x3f] >>
+          ((s->eecd_state.bitnum_out & 0xf) ^ 0xf))) & 1)
+        ret |= E1000_EECD_DO;
+    return ret;
+}
+
+static void
+set_eecd(E1000State *s, int index, uint32_t val)
+{
+    uint32_t oldval = s->eecd_state.old_eecd;
+
+    s->eecd_state.old_eecd = val & (E1000_EECD_SK | E1000_EECD_CS |
+            E1000_EECD_DI|E1000_EECD_FWE_MASK|E1000_EECD_REQ);
+    if (!(E1000_EECD_CS & val))			// CS inactive; nothing to do
+	return;
+    if (E1000_EECD_CS & (val ^ oldval)) {	// CS rise edge; reset state
+	s->eecd_state.val_in = 0;
+	s->eecd_state.bitnum_in = 0;
+	s->eecd_state.bitnum_out = 0;
+	s->eecd_state.reading = 0;
+    }
+    if (!(E1000_EECD_SK & (val ^ oldval)))	// no clock edge
+        return;
+    if (!(E1000_EECD_SK & val)) {		// falling edge
+        s->eecd_state.bitnum_out++;
+        return;
+    }
+    s->eecd_state.val_in <<= 1;
+    if (val & E1000_EECD_DI)
+        s->eecd_state.val_in |= 1;
+    if (++s->eecd_state.bitnum_in == 9 && !s->eecd_state.reading) {
+        s->eecd_state.bitnum_out = ((s->eecd_state.val_in & 0x3f)<<4)-1;
+        s->eecd_state.reading = (((s->eecd_state.val_in >> 6) & 7) ==
+            EEPROM_READ_OPCODE_MICROWIRE);
+    }
+    DBGOUT(EEPROM, "eeprom bitnum in %d out %d, reading %d\n",
+           s->eecd_state.bitnum_in, s->eecd_state.bitnum_out,
+           s->eecd_state.reading);
+}
+
+static uint32_t
+flash_eerd_read(E1000State *s, int x)
+{
+    unsigned int index, r = s->mac_reg[EERD] & ~E1000_EEPROM_RW_REG_START;
+
+    if ((s->mac_reg[EERD] & E1000_EEPROM_RW_REG_START) == 0)
+        return (s->mac_reg[EERD]);
+
+    if ((index = r >> E1000_EEPROM_RW_ADDR_SHIFT) > EEPROM_CHECKSUM_REG)
+        return (E1000_EEPROM_RW_REG_DONE | r);
+
+    return ((s->eeprom_data[index] << E1000_EEPROM_RW_REG_DATA) |
+           E1000_EEPROM_RW_REG_DONE | r);
+}
+
+static void
+putsum(uint8_t *data, uint32_t n, uint32_t sloc, uint32_t css, uint32_t cse)
+{
+    uint32_t sum;
+
+    if (cse && cse < n)
+        n = cse + 1;
+    if (sloc < n-1) {
+        sum = net_checksum_add(n-css, data+css);
+        cpu_to_be16wu((uint16_t *)(data + sloc),
+                      net_checksum_finish(sum));
+    }
+}
+
+static inline int
+vlan_enabled(E1000State *s)
+{
+    return ((s->mac_reg[CTRL] & E1000_CTRL_VME) != 0);
+}
+
+static inline int
+vlan_rx_filter_enabled(E1000State *s)
+{
+    return ((s->mac_reg[RCTL] & E1000_RCTL_VFE) != 0);
+}
+
+static inline int
+is_vlan_packet(E1000State *s, const uint8_t *buf)
+{
+    return (be16_to_cpup((uint16_t *)(buf + 12)) ==
+                le16_to_cpup((uint16_t *)(s->mac_reg + VET)));
+}
+
+static inline int
+is_vlan_txd(uint32_t txd_lower)
+{
+    return ((txd_lower & E1000_TXD_CMD_VLE) != 0);
+}
+
+/* FCS aka Ethernet CRC-32. We don't get it from backends and can't
+ * fill it in, just pad descriptor length by 4 bytes unless guest
+ * told us to strip it off the packet. */
+static inline int
+fcs_len(E1000State *s)
+{
+    return (s->mac_reg[RCTL] & E1000_RCTL_SECRC) ? 0 : 4;
+}
+
+static void
+e1000_send_packet(E1000State *s, const uint8_t *buf, int size)
+{
+    NetClientState *nc = qemu_get_queue(s->nic);
+    if (s->phy_reg[PHY_CTRL] & MII_CR_LOOPBACK) {
+        nc->info->receive(nc, buf, size);
+    } else {
+        qemu_send_packet(nc, buf, size);
+    }
+}
+
+static void
+xmit_seg(E1000State *s)
+{
+    uint16_t len, *sp;
+    unsigned int frames = s->tx.tso_frames, css, sofar, n;
+    struct e1000_tx *tp = &s->tx;
+
+    if (tp->tse && tp->cptse) {
+        css = tp->ipcss;
+        DBGOUT(TXSUM, "frames %d size %d ipcss %d\n",
+               frames, tp->size, css);
+        if (tp->ip) {		// IPv4
+            cpu_to_be16wu((uint16_t *)(tp->data+css+2),
+                          tp->size - css);
+            cpu_to_be16wu((uint16_t *)(tp->data+css+4),
+                          be16_to_cpup((uint16_t *)(tp->data+css+4))+frames);
+        } else			// IPv6
+            cpu_to_be16wu((uint16_t *)(tp->data+css+4),
+                          tp->size - css);
+        css = tp->tucss;
+        len = tp->size - css;
+        DBGOUT(TXSUM, "tcp %d tucss %d len %d\n", tp->tcp, css, len);
+        if (tp->tcp) {
+            sofar = frames * tp->mss;
+            cpu_to_be32wu((uint32_t *)(tp->data+css+4),	// seq
+                be32_to_cpupu((uint32_t *)(tp->data+css+4))+sofar);
+            if (tp->paylen - sofar > tp->mss)
+                tp->data[css + 13] &= ~9;		// PSH, FIN
+        } else	// UDP
+            cpu_to_be16wu((uint16_t *)(tp->data+css+4), len);
+        if (tp->sum_needed & E1000_TXD_POPTS_TXSM) {
+            unsigned int phsum;
+            // add pseudo-header length before checksum calculation
+            sp = (uint16_t *)(tp->data + tp->tucso);
+            phsum = be16_to_cpup(sp) + len;
+            phsum = (phsum >> 16) + (phsum & 0xffff);
+            cpu_to_be16wu(sp, phsum);
+        }
+        tp->tso_frames++;
+    }
+
+    if (tp->sum_needed & E1000_TXD_POPTS_TXSM)
+        putsum(tp->data, tp->size, tp->tucso, tp->tucss, tp->tucse);
+    if (tp->sum_needed & E1000_TXD_POPTS_IXSM)
+        putsum(tp->data, tp->size, tp->ipcso, tp->ipcss, tp->ipcse);
+    if (tp->vlan_needed) {
+        memmove(tp->vlan, tp->data, 4);
+        memmove(tp->data, tp->data + 4, 8);
+        memcpy(tp->data + 8, tp->vlan_header, 4);
+        e1000_send_packet(s, tp->vlan, tp->size + 4);
+    } else
+        e1000_send_packet(s, tp->data, tp->size);
+    s->mac_reg[TPT]++;
+    s->mac_reg[GPTC]++;
+    n = s->mac_reg[TOTL];
+    if ((s->mac_reg[TOTL] += s->tx.size) < n)
+        s->mac_reg[TOTH]++;
+}
+
+static void
+process_tx_desc(E1000State *s, struct e1000_tx_desc *dp)
+{
+    uint32_t txd_lower = le32_to_cpu(dp->lower.data);
+    uint32_t dtype = txd_lower & (E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D);
+    unsigned int split_size = txd_lower & 0xffff, bytes, sz, op;
+    unsigned int msh = 0xfffff, hdr = 0;
+    uint64_t addr;
+    struct e1000_context_desc *xp = (struct e1000_context_desc *)dp;
+    struct e1000_tx *tp = &s->tx;
+
+    if (dtype == E1000_TXD_CMD_DEXT) {	// context descriptor
+        op = le32_to_cpu(xp->cmd_and_length);
+        tp->ipcss = xp->lower_setup.ip_fields.ipcss;
+        tp->ipcso = xp->lower_setup.ip_fields.ipcso;
+        tp->ipcse = le16_to_cpu(xp->lower_setup.ip_fields.ipcse);
+        tp->tucss = xp->upper_setup.tcp_fields.tucss;
+        tp->tucso = xp->upper_setup.tcp_fields.tucso;
+        tp->tucse = le16_to_cpu(xp->upper_setup.tcp_fields.tucse);
+        tp->paylen = op & 0xfffff;
+        tp->hdr_len = xp->tcp_seg_setup.fields.hdr_len;
+        tp->mss = le16_to_cpu(xp->tcp_seg_setup.fields.mss);
+        tp->ip = (op & E1000_TXD_CMD_IP) ? 1 : 0;
+        tp->tcp = (op & E1000_TXD_CMD_TCP) ? 1 : 0;
+        tp->tse = (op & E1000_TXD_CMD_TSE) ? 1 : 0;
+        tp->tso_frames = 0;
+        if (tp->tucso == 0) {	// this is probably wrong
+            DBGOUT(TXSUM, "TCP/UDP: cso 0!\n");
+            tp->tucso = tp->tucss + (tp->tcp ? 16 : 6);
+        }
+        return;
+    } else if (dtype == (E1000_TXD_CMD_DEXT | E1000_TXD_DTYP_D)) {
+        // data descriptor
+        if (tp->size == 0) {
+            tp->sum_needed = le32_to_cpu(dp->upper.data) >> 8;
+        }
+        tp->cptse = ( txd_lower & E1000_TXD_CMD_TSE ) ? 1 : 0;
+    } else {
+        // legacy descriptor
+        tp->cptse = 0;
+    }
+
+    if (vlan_enabled(s) && is_vlan_txd(txd_lower) &&
+        (tp->cptse || txd_lower & E1000_TXD_CMD_EOP)) {
+        tp->vlan_needed = 1;
+        cpu_to_be16wu((uint16_t *)(tp->vlan_header),
+                      le16_to_cpup((uint16_t *)(s->mac_reg + VET)));
+        cpu_to_be16wu((uint16_t *)(tp->vlan_header + 2),
+                      le16_to_cpu(dp->upper.fields.special));
+    }
+        
+    addr = le64_to_cpu(dp->buffer_addr);
+    if (tp->tse && tp->cptse) {
+        hdr = tp->hdr_len;
+        msh = hdr + tp->mss;
+        do {
+            bytes = split_size;
+            if (tp->size + bytes > msh)
+                bytes = msh - tp->size;
+
+            bytes = MIN(sizeof(tp->data) - tp->size, bytes);
+            pci_dma_read(&s->dev, addr, tp->data + tp->size, bytes);
+            if ((sz = tp->size + bytes) >= hdr && tp->size < hdr)
+                memmove(tp->header, tp->data, hdr);
+            tp->size = sz;
+            addr += bytes;
+            if (sz == msh) {
+                xmit_seg(s);
+                memmove(tp->data, tp->header, hdr);
+                tp->size = hdr;
+            }
+        } while (split_size -= bytes);
+    } else if (!tp->tse && tp->cptse) {
+        // context descriptor TSE is not set, while data descriptor TSE is set
+        DBGOUT(TXERR, "TCP segmentation error\n");
+    } else {
+        split_size = MIN(sizeof(tp->data) - tp->size, split_size);
+        pci_dma_read(&s->dev, addr, tp->data + tp->size, split_size);
+        tp->size += split_size;
+    }
+
+    if (!(txd_lower & E1000_TXD_CMD_EOP))
+        return;
+    if (!(tp->tse && tp->cptse && tp->size < hdr))
+        xmit_seg(s);
+    tp->tso_frames = 0;
+    tp->sum_needed = 0;
+    tp->vlan_needed = 0;
+    tp->size = 0;
+    tp->cptse = 0;
+}
+
+static uint32_t
+txdesc_writeback(E1000State *s, dma_addr_t base, struct e1000_tx_desc *dp)
+{
+    uint32_t txd_upper, txd_lower = le32_to_cpu(dp->lower.data);
+
+    if (!(txd_lower & (E1000_TXD_CMD_RS|E1000_TXD_CMD_RPS)))
+        return 0;
+    txd_upper = (le32_to_cpu(dp->upper.data) | E1000_TXD_STAT_DD) &
+                ~(E1000_TXD_STAT_EC | E1000_TXD_STAT_LC | E1000_TXD_STAT_TU);
+    dp->upper.data = cpu_to_le32(txd_upper);
+    pci_dma_write(&s->dev, base + ((char *)&dp->upper - (char *)dp),
+                  &dp->upper, sizeof(dp->upper));
+    return E1000_ICR_TXDW;
+}
+
+static uint64_t tx_desc_base(E1000State *s)
+{
+    uint64_t bah = s->mac_reg[TDBAH];
+    uint64_t bal = s->mac_reg[TDBAL] & ~0xf;
+
+    return (bah << 32) + bal;
+}
+
+static void
+start_xmit(E1000State *s)
+{
+    dma_addr_t base;
+    struct e1000_tx_desc desc;
+    uint32_t tdh_start = s->mac_reg[TDH], cause = E1000_ICS_TXQE;
+
+    if (!(s->mac_reg[TCTL] & E1000_TCTL_EN)) {
+        DBGOUT(TX, "tx disabled\n");
+        return;
+    }
+
+    while (s->mac_reg[TDH] != s->mac_reg[TDT]) {
+        base = tx_desc_base(s) +
+               sizeof(struct e1000_tx_desc) * s->mac_reg[TDH];
+        pci_dma_read(&s->dev, base, &desc, sizeof(desc));
+
+        DBGOUT(TX, "index %d: %p : %x %x\n", s->mac_reg[TDH],
+               (void *)(intptr_t)desc.buffer_addr, desc.lower.data,
+               desc.upper.data);
+
+        process_tx_desc(s, &desc);
+        cause |= txdesc_writeback(s, base, &desc);
+
+        if (++s->mac_reg[TDH] * sizeof(desc) >= s->mac_reg[TDLEN])
+            s->mac_reg[TDH] = 0;
+        /*
+         * the following could happen only if guest sw assigns
+         * bogus values to TDT/TDLEN.
+         * there's nothing too intelligent we could do about this.
+         */
+        if (s->mac_reg[TDH] == tdh_start) {
+            DBGOUT(TXERR, "TDH wraparound @%x, TDT %x, TDLEN %x\n",
+                   tdh_start, s->mac_reg[TDT], s->mac_reg[TDLEN]);
+            break;
+        }
+    }
+    set_ics(s, 0, cause);
+}
+
+static int
+receive_filter(E1000State *s, const uint8_t *buf, int size)
+{
+    static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+    static const int mta_shift[] = {4, 3, 2, 0};
+    uint32_t f, rctl = s->mac_reg[RCTL], ra[2], *rp;
+
+    if (is_vlan_packet(s, buf) && vlan_rx_filter_enabled(s)) {
+        uint16_t vid = be16_to_cpup((uint16_t *)(buf + 14));
+        uint32_t vfta = le32_to_cpup((uint32_t *)(s->mac_reg + VFTA) +
+                                     ((vid >> 5) & 0x7f));
+        if ((vfta & (1 << (vid & 0x1f))) == 0)
+            return 0;
+    }
+
+    if (rctl & E1000_RCTL_UPE)			// promiscuous
+        return 1;
+
+    if ((buf[0] & 1) && (rctl & E1000_RCTL_MPE))	// promiscuous mcast
+        return 1;
+
+    if ((rctl & E1000_RCTL_BAM) && !memcmp(buf, bcast, sizeof bcast))
+        return 1;
+
+    for (rp = s->mac_reg + RA; rp < s->mac_reg + RA + 32; rp += 2) {
+        if (!(rp[1] & E1000_RAH_AV))
+            continue;
+        ra[0] = cpu_to_le32(rp[0]);
+        ra[1] = cpu_to_le32(rp[1]);
+        if (!memcmp(buf, (uint8_t *)ra, 6)) {
+            DBGOUT(RXFILTER,
+                   "unicast match[%d]: %02x:%02x:%02x:%02x:%02x:%02x\n",
+                   (int)(rp - s->mac_reg - RA)/2,
+                   buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+            return 1;
+        }
+    }
+    DBGOUT(RXFILTER, "unicast mismatch: %02x:%02x:%02x:%02x:%02x:%02x\n",
+           buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+
+    f = mta_shift[(rctl >> E1000_RCTL_MO_SHIFT) & 3];
+    f = (((buf[5] << 8) | buf[4]) >> f) & 0xfff;
+    if (s->mac_reg[MTA + (f >> 5)] & (1 << (f & 0x1f)))
+        return 1;
+    DBGOUT(RXFILTER,
+           "dropping, inexact filter mismatch: %02x:%02x:%02x:%02x:%02x:%02x MO %d MTA[%d] %x\n",
+           buf[0], buf[1], buf[2], buf[3], buf[4], buf[5],
+           (rctl >> E1000_RCTL_MO_SHIFT) & 3, f >> 5,
+           s->mac_reg[MTA + (f >> 5)]);
+
+    return 0;
+}
+
+static void
+e1000_set_link_status(NetClientState *nc)
+{
+    E1000State *s = qemu_get_nic_opaque(nc);
+    uint32_t old_status = s->mac_reg[STATUS];
+
+    if (nc->link_down) {
+        e1000_link_down(s);
+    } else {
+        e1000_link_up(s);
+    }
+
+    if (s->mac_reg[STATUS] != old_status)
+        set_ics(s, 0, E1000_ICR_LSC);
+}
+
+static bool e1000_has_rxbufs(E1000State *s, size_t total_size)
+{
+    int bufs;
+    /* Fast-path short packets */
+    if (total_size <= s->rxbuf_size) {
+        return s->mac_reg[RDH] != s->mac_reg[RDT];
+    }
+    if (s->mac_reg[RDH] < s->mac_reg[RDT]) {
+        bufs = s->mac_reg[RDT] - s->mac_reg[RDH];
+    } else if (s->mac_reg[RDH] > s->mac_reg[RDT]) {
+        bufs = s->mac_reg[RDLEN] /  sizeof(struct e1000_rx_desc) +
+            s->mac_reg[RDT] - s->mac_reg[RDH];
+    } else {
+        return false;
+    }
+    return total_size <= bufs * s->rxbuf_size;
+}
+
+static int
+e1000_can_receive(NetClientState *nc)
+{
+    E1000State *s = qemu_get_nic_opaque(nc);
+
+    return (s->mac_reg[STATUS] & E1000_STATUS_LU) &&
+        (s->mac_reg[RCTL] & E1000_RCTL_EN) && e1000_has_rxbufs(s, 1);
+}
+
+static uint64_t rx_desc_base(E1000State *s)
+{
+    uint64_t bah = s->mac_reg[RDBAH];
+    uint64_t bal = s->mac_reg[RDBAL] & ~0xf;
+
+    return (bah << 32) + bal;
+}
+
+static ssize_t
+e1000_receive(NetClientState *nc, const uint8_t *buf, size_t size)
+{
+    E1000State *s = qemu_get_nic_opaque(nc);
+    struct e1000_rx_desc desc;
+    dma_addr_t base;
+    unsigned int n, rdt;
+    uint32_t rdh_start;
+    uint16_t vlan_special = 0;
+    uint8_t vlan_status = 0, vlan_offset = 0;
+    uint8_t min_buf[MIN_BUF_SIZE];
+    size_t desc_offset;
+    size_t desc_size;
+    size_t total_size;
+
+    if (!(s->mac_reg[STATUS] & E1000_STATUS_LU)) {
+        return -1;
+    }
+
+    if (!(s->mac_reg[RCTL] & E1000_RCTL_EN)) {
+        return -1;
+    }
+
+    /* Pad to minimum Ethernet frame length */
+    if (size < sizeof(min_buf)) {
+        memcpy(min_buf, buf, size);
+        memset(&min_buf[size], 0, sizeof(min_buf) - size);
+        buf = min_buf;
+        size = sizeof(min_buf);
+    }
+
+    /* Discard oversized packets if !LPE and !SBP. */
+    if ((size > MAXIMUM_ETHERNET_LPE_SIZE ||
+        (size > MAXIMUM_ETHERNET_VLAN_SIZE
+        && !(s->mac_reg[RCTL] & E1000_RCTL_LPE)))
+        && !(s->mac_reg[RCTL] & E1000_RCTL_SBP)) {
+        return size;
+    }
+
+    if (!receive_filter(s, buf, size))
+        return size;
+
+    if (vlan_enabled(s) && is_vlan_packet(s, buf)) {
+        vlan_special = cpu_to_le16(be16_to_cpup((uint16_t *)(buf + 14)));
+        memmove((uint8_t *)buf + 4, buf, 12);
+        vlan_status = E1000_RXD_STAT_VP;
+        vlan_offset = 4;
+        size -= 4;
+    }
+
+    rdh_start = s->mac_reg[RDH];
+    desc_offset = 0;
+    total_size = size + fcs_len(s);
+    if (!e1000_has_rxbufs(s, total_size)) {
+            set_ics(s, 0, E1000_ICS_RXO);
+            return -1;
+    }
+    do {
+        desc_size = total_size - desc_offset;
+        if (desc_size > s->rxbuf_size) {
+            desc_size = s->rxbuf_size;
+        }
+        base = rx_desc_base(s) + sizeof(desc) * s->mac_reg[RDH];
+        pci_dma_read(&s->dev, base, &desc, sizeof(desc));
+        desc.special = vlan_special;
+        desc.status |= (vlan_status | E1000_RXD_STAT_DD);
+        if (desc.buffer_addr) {
+            if (desc_offset < size) {
+                size_t copy_size = size - desc_offset;
+                if (copy_size > s->rxbuf_size) {
+                    copy_size = s->rxbuf_size;
+                }
+                pci_dma_write(&s->dev, le64_to_cpu(desc.buffer_addr),
+                              buf + desc_offset + vlan_offset, copy_size);
+            }
+            desc_offset += desc_size;
+            desc.length = cpu_to_le16(desc_size);
+            if (desc_offset >= total_size) {
+                desc.status |= E1000_RXD_STAT_EOP | E1000_RXD_STAT_IXSM;
+            } else {
+                /* Guest zeroing out status is not a hardware requirement.
+                   Clear EOP in case guest didn't do it. */
+                desc.status &= ~E1000_RXD_STAT_EOP;
+            }
+        } else { // as per intel docs; skip descriptors with null buf addr
+            DBGOUT(RX, "Null RX descriptor!!\n");
+        }
+        pci_dma_write(&s->dev, base, &desc, sizeof(desc));
+
+        if (++s->mac_reg[RDH] * sizeof(desc) >= s->mac_reg[RDLEN])
+            s->mac_reg[RDH] = 0;
+        /* see comment in start_xmit; same here */
+        if (s->mac_reg[RDH] == rdh_start) {
+            DBGOUT(RXERR, "RDH wraparound @%x, RDT %x, RDLEN %x\n",
+                   rdh_start, s->mac_reg[RDT], s->mac_reg[RDLEN]);
+            set_ics(s, 0, E1000_ICS_RXO);
+            return -1;
+        }
+    } while (desc_offset < total_size);
+
+    s->mac_reg[GPRC]++;
+    s->mac_reg[TPR]++;
+    /* TOR - Total Octets Received:
+     * This register includes bytes received in a packet from the <Destination
+     * Address> field through the <CRC> field, inclusively.
+     */
+    n = s->mac_reg[TORL] + size + /* Always include FCS length. */ 4;
+    if (n < s->mac_reg[TORL])
+        s->mac_reg[TORH]++;
+    s->mac_reg[TORL] = n;
+
+    n = E1000_ICS_RXT0;
+    if ((rdt = s->mac_reg[RDT]) < s->mac_reg[RDH])
+        rdt += s->mac_reg[RDLEN] / sizeof(desc);
+    if (((rdt - s->mac_reg[RDH]) * sizeof(desc)) <= s->mac_reg[RDLEN] >>
+        s->rxbuf_min_shift)
+        n |= E1000_ICS_RXDMT0;
+
+    set_ics(s, 0, n);
+
+    return size;
+}
+
+static uint32_t
+mac_readreg(E1000State *s, int index)
+{
+    return s->mac_reg[index];
+}
+
+static uint32_t
+mac_icr_read(E1000State *s, int index)
+{
+    uint32_t ret = s->mac_reg[ICR];
+
+    DBGOUT(INTERRUPT, "ICR read: %x\n", ret);
+    set_interrupt_cause(s, 0, 0);
+    return ret;
+}
+
+static uint32_t
+mac_read_clr4(E1000State *s, int index)
+{
+    uint32_t ret = s->mac_reg[index];
+
+    s->mac_reg[index] = 0;
+    return ret;
+}
+
+static uint32_t
+mac_read_clr8(E1000State *s, int index)
+{
+    uint32_t ret = s->mac_reg[index];
+
+    s->mac_reg[index] = 0;
+    s->mac_reg[index-1] = 0;
+    return ret;
+}
+
+static void
+mac_writereg(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[index] = val;
+}
+
+static void
+set_rdt(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[index] = val & 0xffff;
+    if (e1000_has_rxbufs(s, 1)) {
+        qemu_flush_queued_packets(qemu_get_queue(s->nic));
+    }
+}
+
+static void
+set_16bit(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[index] = val & 0xffff;
+}
+
+static void
+set_dlen(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[index] = val & 0xfff80;
+}
+
+static void
+set_tctl(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[index] = val;
+    s->mac_reg[TDT] &= 0xffff;
+    start_xmit(s);
+}
+
+static void
+set_icr(E1000State *s, int index, uint32_t val)
+{
+    DBGOUT(INTERRUPT, "set_icr %x\n", val);
+    set_interrupt_cause(s, 0, s->mac_reg[ICR] & ~val);
+}
+
+static void
+set_imc(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[IMS] &= ~val;
+    set_ics(s, 0, 0);
+}
+
+static void
+set_ims(E1000State *s, int index, uint32_t val)
+{
+    s->mac_reg[IMS] |= val;
+    set_ics(s, 0, 0);
+}
+
+#define getreg(x)	[x] = mac_readreg
+static uint32_t (*macreg_readops[])(E1000State *, int) = {
+    getreg(PBA),	getreg(RCTL),	getreg(TDH),	getreg(TXDCTL),
+    getreg(WUFC),	getreg(TDT),	getreg(CTRL),	getreg(LEDCTL),
+    getreg(MANC),	getreg(MDIC),	getreg(SWSM),	getreg(STATUS),
+    getreg(TORL),	getreg(TOTL),	getreg(IMS),	getreg(TCTL),
+    getreg(RDH),	getreg(RDT),	getreg(VET),	getreg(ICS),
+    getreg(TDBAL),	getreg(TDBAH),	getreg(RDBAH),	getreg(RDBAL),
+    getreg(TDLEN),	getreg(RDLEN),
+
+    [TOTH] = mac_read_clr8,	[TORH] = mac_read_clr8,	[GPRC] = mac_read_clr4,
+    [GPTC] = mac_read_clr4,	[TPR] = mac_read_clr4,	[TPT] = mac_read_clr4,
+    [ICR] = mac_icr_read,	[EECD] = get_eecd,	[EERD] = flash_eerd_read,
+    [CRCERRS ... MPC] = &mac_readreg,
+    [RA ... RA+31] = &mac_readreg,
+    [MTA ... MTA+127] = &mac_readreg,
+    [VFTA ... VFTA+127] = &mac_readreg,
+};
+enum { NREADOPS = ARRAY_SIZE(macreg_readops) };
+
+#define putreg(x)	[x] = mac_writereg
+static void (*macreg_writeops[])(E1000State *, int, uint32_t) = {
+    putreg(PBA),	putreg(EERD),	putreg(SWSM),	putreg(WUFC),
+    putreg(TDBAL),	putreg(TDBAH),	putreg(TXDCTL),	putreg(RDBAH),
+    putreg(RDBAL),	putreg(LEDCTL), putreg(VET),
+    [TDLEN] = set_dlen,	[RDLEN] = set_dlen,	[TCTL] = set_tctl,
+    [TDT] = set_tctl,	[MDIC] = set_mdic,	[ICS] = set_ics,
+    [TDH] = set_16bit,	[RDH] = set_16bit,	[RDT] = set_rdt,
+    [IMC] = set_imc,	[IMS] = set_ims,	[ICR] = set_icr,
+    [EECD] = set_eecd,	[RCTL] = set_rx_control, [CTRL] = set_ctrl,
+    [RA ... RA+31] = &mac_writereg,
+    [MTA ... MTA+127] = &mac_writereg,
+    [VFTA ... VFTA+127] = &mac_writereg,
+};
+
+enum { NWRITEOPS = ARRAY_SIZE(macreg_writeops) };
+
+static void
+e1000_mmio_write(void *opaque, hwaddr addr, uint64_t val,
+                 unsigned size)
+{
+    E1000State *s = opaque;
+    unsigned int index = (addr & 0x1ffff) >> 2;
+
+    if (index < NWRITEOPS && macreg_writeops[index]) {
+        macreg_writeops[index](s, index, val);
+    } else if (index < NREADOPS && macreg_readops[index]) {
+        DBGOUT(MMIO, "e1000_mmio_writel RO %x: 0x%04"PRIx64"\n", index<<2, val);
+    } else {
+        DBGOUT(UNKNOWN, "MMIO unknown write addr=0x%08x,val=0x%08"PRIx64"\n",
+               index<<2, val);
+    }
+}
+
+static uint64_t
+e1000_mmio_read(void *opaque, hwaddr addr, unsigned size)
+{
+    E1000State *s = opaque;
+    unsigned int index = (addr & 0x1ffff) >> 2;
+
+    if (index < NREADOPS && macreg_readops[index])
+    {
+        return macreg_readops[index](s, index);
+    }
+    DBGOUT(UNKNOWN, "MMIO unknown read addr=0x%08x\n", index<<2);
+    return 0;
+}
+
+static const MemoryRegionOps e1000_mmio_ops = {
+    .read = e1000_mmio_read,
+    .write = e1000_mmio_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .impl = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static uint64_t e1000_io_read(void *opaque, hwaddr addr,
+                              unsigned size)
+{
+    E1000State *s = opaque;
+
+    (void)s;
+    return 0;
+}
+
+static void e1000_io_write(void *opaque, hwaddr addr,
+                           uint64_t val, unsigned size)
+{
+    E1000State *s = opaque;
+
+    (void)s;
+}
+
+static const MemoryRegionOps e1000_io_ops = {
+    .read = e1000_io_read,
+    .write = e1000_io_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+};
+
+static bool is_version_1(void *opaque, int version_id)
+{
+    return version_id == 1;
+}
+
+static void e1000_pre_save(void *opaque)
+{
+    E1000State *s = opaque;
+    NetClientState *nc = qemu_get_queue(s->nic);
+
+    if (!(s->compat_flags & E1000_FLAG_AUTONEG)) {
+        return;
+    }
+
+    /*
+     * If link is down and auto-negotiation is ongoing, complete
+     * auto-negotiation immediately.  This allows is to look at
+     * MII_SR_AUTONEG_COMPLETE to infer link status on load.
+     */
+    if (nc->link_down &&
+        s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN &&
+        s->phy_reg[PHY_CTRL] & MII_CR_RESTART_AUTO_NEG) {
+         s->phy_reg[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
+    }
+}
+
+static int e1000_post_load(void *opaque, int version_id)
+{
+    E1000State *s = opaque;
+    NetClientState *nc = qemu_get_queue(s->nic);
+
+    /* nc.link_down can't be migrated, so infer link_down according
+     * to link status bit in mac_reg[STATUS].
+     * Alternatively, restart link negotiation if it was in progress. */
+    nc->link_down = (s->mac_reg[STATUS] & E1000_STATUS_LU) == 0;
+
+    if (!(s->compat_flags & E1000_FLAG_AUTONEG)) {
+        return 0;
+    }
+
+    if (s->phy_reg[PHY_CTRL] & MII_CR_AUTO_NEG_EN &&
+        s->phy_reg[PHY_CTRL] & MII_CR_RESTART_AUTO_NEG &&
+        !(s->phy_reg[PHY_STATUS] & MII_SR_AUTONEG_COMPLETE)) {
+        nc->link_down = false;
+        qemu_mod_timer(s->autoneg_timer, qemu_get_clock_ms(vm_clock) + 500);
+    }
+
+    return 0;
+}
+
+static const VMStateDescription vmstate_e1000 = {
+    .name = "e1000",
+    .version_id = 2,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .pre_save = e1000_pre_save,
+    .post_load = e1000_post_load,
+    .fields      = (VMStateField []) {
+        VMSTATE_PCI_DEVICE(dev, E1000State),
+        VMSTATE_UNUSED_TEST(is_version_1, 4), /* was instance id */
+        VMSTATE_UNUSED(4), /* Was mmio_base.  */
+        VMSTATE_UINT32(rxbuf_size, E1000State),
+        VMSTATE_UINT32(rxbuf_min_shift, E1000State),
+        VMSTATE_UINT32(eecd_state.val_in, E1000State),
+        VMSTATE_UINT16(eecd_state.bitnum_in, E1000State),
+        VMSTATE_UINT16(eecd_state.bitnum_out, E1000State),
+        VMSTATE_UINT16(eecd_state.reading, E1000State),
+        VMSTATE_UINT32(eecd_state.old_eecd, E1000State),
+        VMSTATE_UINT8(tx.ipcss, E1000State),
+        VMSTATE_UINT8(tx.ipcso, E1000State),
+        VMSTATE_UINT16(tx.ipcse, E1000State),
+        VMSTATE_UINT8(tx.tucss, E1000State),
+        VMSTATE_UINT8(tx.tucso, E1000State),
+        VMSTATE_UINT16(tx.tucse, E1000State),
+        VMSTATE_UINT32(tx.paylen, E1000State),
+        VMSTATE_UINT8(tx.hdr_len, E1000State),
+        VMSTATE_UINT16(tx.mss, E1000State),
+        VMSTATE_UINT16(tx.size, E1000State),
+        VMSTATE_UINT16(tx.tso_frames, E1000State),
+        VMSTATE_UINT8(tx.sum_needed, E1000State),
+        VMSTATE_INT8(tx.ip, E1000State),
+        VMSTATE_INT8(tx.tcp, E1000State),
+        VMSTATE_BUFFER(tx.header, E1000State),
+        VMSTATE_BUFFER(tx.data, E1000State),
+        VMSTATE_UINT16_ARRAY(eeprom_data, E1000State, 64),
+        VMSTATE_UINT16_ARRAY(phy_reg, E1000State, 0x20),
+        VMSTATE_UINT32(mac_reg[CTRL], E1000State),
+        VMSTATE_UINT32(mac_reg[EECD], E1000State),
+        VMSTATE_UINT32(mac_reg[EERD], E1000State),
+        VMSTATE_UINT32(mac_reg[GPRC], E1000State),
+        VMSTATE_UINT32(mac_reg[GPTC], E1000State),
+        VMSTATE_UINT32(mac_reg[ICR], E1000State),
+        VMSTATE_UINT32(mac_reg[ICS], E1000State),
+        VMSTATE_UINT32(mac_reg[IMC], E1000State),
+        VMSTATE_UINT32(mac_reg[IMS], E1000State),
+        VMSTATE_UINT32(mac_reg[LEDCTL], E1000State),
+        VMSTATE_UINT32(mac_reg[MANC], E1000State),
+        VMSTATE_UINT32(mac_reg[MDIC], E1000State),
+        VMSTATE_UINT32(mac_reg[MPC], E1000State),
+        VMSTATE_UINT32(mac_reg[PBA], E1000State),
+        VMSTATE_UINT32(mac_reg[RCTL], E1000State),
+        VMSTATE_UINT32(mac_reg[RDBAH], E1000State),
+        VMSTATE_UINT32(mac_reg[RDBAL], E1000State),
+        VMSTATE_UINT32(mac_reg[RDH], E1000State),
+        VMSTATE_UINT32(mac_reg[RDLEN], E1000State),
+        VMSTATE_UINT32(mac_reg[RDT], E1000State),
+        VMSTATE_UINT32(mac_reg[STATUS], E1000State),
+        VMSTATE_UINT32(mac_reg[SWSM], E1000State),
+        VMSTATE_UINT32(mac_reg[TCTL], E1000State),
+        VMSTATE_UINT32(mac_reg[TDBAH], E1000State),
+        VMSTATE_UINT32(mac_reg[TDBAL], E1000State),
+        VMSTATE_UINT32(mac_reg[TDH], E1000State),
+        VMSTATE_UINT32(mac_reg[TDLEN], E1000State),
+        VMSTATE_UINT32(mac_reg[TDT], E1000State),
+        VMSTATE_UINT32(mac_reg[TORH], E1000State),
+        VMSTATE_UINT32(mac_reg[TORL], E1000State),
+        VMSTATE_UINT32(mac_reg[TOTH], E1000State),
+        VMSTATE_UINT32(mac_reg[TOTL], E1000State),
+        VMSTATE_UINT32(mac_reg[TPR], E1000State),
+        VMSTATE_UINT32(mac_reg[TPT], E1000State),
+        VMSTATE_UINT32(mac_reg[TXDCTL], E1000State),
+        VMSTATE_UINT32(mac_reg[WUFC], E1000State),
+        VMSTATE_UINT32(mac_reg[VET], E1000State),
+        VMSTATE_UINT32_SUB_ARRAY(mac_reg, E1000State, RA, 32),
+        VMSTATE_UINT32_SUB_ARRAY(mac_reg, E1000State, MTA, 128),
+        VMSTATE_UINT32_SUB_ARRAY(mac_reg, E1000State, VFTA, 128),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static const uint16_t e1000_eeprom_template[64] = {
+    0x0000, 0x0000, 0x0000, 0x0000,      0xffff, 0x0000,      0x0000, 0x0000,
+    0x3000, 0x1000, 0x6403, E1000_DEVID, 0x8086, E1000_DEVID, 0x8086, 0x3040,
+    0x0008, 0x2000, 0x7e14, 0x0048,      0x1000, 0x00d8,      0x0000, 0x2700,
+    0x6cc9, 0x3150, 0x0722, 0x040b,      0x0984, 0x0000,      0xc000, 0x0706,
+    0x1008, 0x0000, 0x0f04, 0x7fff,      0x4d01, 0xffff,      0xffff, 0xffff,
+    0xffff, 0xffff, 0xffff, 0xffff,      0xffff, 0xffff,      0xffff, 0xffff,
+    0x0100, 0x4000, 0x121c, 0xffff,      0xffff, 0xffff,      0xffff, 0xffff,
+    0xffff, 0xffff, 0xffff, 0xffff,      0xffff, 0xffff,      0xffff, 0x0000,
+};
+
+/* PCI interface */
+
+static void
+e1000_mmio_setup(E1000State *d)
+{
+    int i;
+    const uint32_t excluded_regs[] = {
+        E1000_MDIC, E1000_ICR, E1000_ICS, E1000_IMS,
+        E1000_IMC, E1000_TCTL, E1000_TDT, PNPMMIO_SIZE
+    };
+
+    memory_region_init_io(&d->mmio, &e1000_mmio_ops, d, "e1000-mmio",
+                          PNPMMIO_SIZE);
+    memory_region_add_coalescing(&d->mmio, 0, excluded_regs[0]);
+    for (i = 0; excluded_regs[i] != PNPMMIO_SIZE; i++)
+        memory_region_add_coalescing(&d->mmio, excluded_regs[i] + 4,
+                                     excluded_regs[i+1] - excluded_regs[i] - 4);
+    memory_region_init_io(&d->io, &e1000_io_ops, d, "e1000-io", IOPORT_SIZE);
+}
+
+static void
+e1000_cleanup(NetClientState *nc)
+{
+    E1000State *s = qemu_get_nic_opaque(nc);
+
+    s->nic = NULL;
+}
+
+static void
+pci_e1000_uninit(PCIDevice *dev)
+{
+    E1000State *d = DO_UPCAST(E1000State, dev, dev);
+
+    qemu_del_timer(d->autoneg_timer);
+    qemu_free_timer(d->autoneg_timer);
+    memory_region_destroy(&d->mmio);
+    memory_region_destroy(&d->io);
+    qemu_del_nic(d->nic);
+}
+
+static NetClientInfo net_e1000_info = {
+    .type = NET_CLIENT_OPTIONS_KIND_NIC,
+    .size = sizeof(NICState),
+    .can_receive = e1000_can_receive,
+    .receive = e1000_receive,
+    .cleanup = e1000_cleanup,
+    .link_status_changed = e1000_set_link_status,
+};
+
+static int pci_e1000_init(PCIDevice *pci_dev)
+{
+    E1000State *d = DO_UPCAST(E1000State, dev, pci_dev);
+    uint8_t *pci_conf;
+    uint16_t checksum = 0;
+    int i;
+    uint8_t *macaddr;
+
+    pci_conf = d->dev.config;
+
+    /* TODO: RST# value should be 0, PCI spec 6.2.4 */
+    pci_conf[PCI_CACHE_LINE_SIZE] = 0x10;
+
+    pci_conf[PCI_INTERRUPT_PIN] = 1; /* interrupt pin A */
+
+    e1000_mmio_setup(d);
+
+    pci_register_bar(&d->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio);
+
+    pci_register_bar(&d->dev, 1, PCI_BASE_ADDRESS_SPACE_IO, &d->io);
+
+    memmove(d->eeprom_data, e1000_eeprom_template,
+        sizeof e1000_eeprom_template);
+    qemu_macaddr_default_if_unset(&d->conf.macaddr);
+    macaddr = d->conf.macaddr.a;
+    for (i = 0; i < 3; i++)
+        d->eeprom_data[i] = (macaddr[2*i+1]<<8) | macaddr[2*i];
+    for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
+        checksum += d->eeprom_data[i];
+    checksum = (uint16_t) EEPROM_SUM - checksum;
+    d->eeprom_data[EEPROM_CHECKSUM_REG] = checksum;
+
+    d->nic = qemu_new_nic(&net_e1000_info, &d->conf,
+                          object_get_typename(OBJECT(d)), d->dev.qdev.id, d);
+
+    qemu_format_nic_info_str(qemu_get_queue(d->nic), macaddr);
+
+    add_boot_device_path(d->conf.bootindex, &pci_dev->qdev, "/ethernet-phy@0");
+
+    d->autoneg_timer = qemu_new_timer_ms(vm_clock, e1000_autoneg_timer, d);
+
+    return 0;
+}
+
+static void qdev_e1000_reset(DeviceState *dev)
+{
+    E1000State *d = DO_UPCAST(E1000State, dev.qdev, dev);
+    e1000_reset(d);
+}
+
+static Property e1000_properties[] = {
+    DEFINE_NIC_PROPERTIES(E1000State, conf),
+    DEFINE_PROP_BIT("autonegotiation", E1000State,
+                    compat_flags, E1000_FLAG_AUTONEG_BIT, true),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void e1000_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->init = pci_e1000_init;
+    k->exit = pci_e1000_uninit;
+    k->romfile = "efi-e1000.rom";
+    k->vendor_id = PCI_VENDOR_ID_INTEL;
+    k->device_id = E1000_DEVID;
+    k->revision = 0x03;
+    k->class_id = PCI_CLASS_NETWORK_ETHERNET;
+    dc->desc = "Intel Gigabit Ethernet";
+    dc->reset = qdev_e1000_reset;
+    dc->vmsd = &vmstate_e1000;
+    dc->props = e1000_properties;
+}
+
+static const TypeInfo e1000_info = {
+    .name          = "e1000",
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(E1000State),
+    .class_init    = e1000_class_init,
+};
+
+static void e1000_register_types(void)
+{
+    type_register_static(&e1000_info);
+}
+
+type_init(e1000_register_types)