E1000 NIC emulation (Nir Peleg, patch from Dor Laor).

Applied %s/^\([^I ]*\)^I/\1    /g on e1000.c and added e1000 to help message.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3949 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 999 insertions, 0 deletions

diff --git a/hw/e1000.c b/hw/e1000.c
new file mode 100644
index 0000000000..d573f7033b
--- /dev/null
+++ b/hw/e1000.c
@@ -0,0 +1,999 @@
+/*
+ * QEMU e1000 emulation
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+
+#include "hw.h"
+#include "pci.h"
+#include "net.h"
+
+#define __iomem
+typedef int boolean_t;
+#include "e1000_hw.h"
+
+#define DEBUG
+
+#ifdef 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_NOTYET,
+};
+#define DBGBIT(x)	(1<<DEBUG_##x)
+static int debugflags = DBGBIT(TXERR) | DBGBIT(GENERAL);
+
+#define	DBGOUT(what, fmt, params...) do { \
+    if (debugflags & DBGBIT(what)) \
+        fprintf(stderr, "e1000: " fmt, ##params); \
+    } while (0)
+#else
+#define	DBGOUT(what, fmt, params...) do {} while (0)
+#endif
+
+#define IOPORT_SIZE       0x40
+#define PNPMMIO_SIZE      0x60000
+
+/*
+ * 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;
+    VLANClientState *vc;
+    NICInfo *nd;
+    uint32_t instance;
+    uint32_t mmio_base;
+    int mmio_index;
+
+    uint32_t mac_reg[0x8000];
+    uint16_t phy_reg[0x20];
+    uint16_t eeprom_data[64];
+
+    uint32_t rxbuf_size;
+    uint32_t rxbuf_min_shift;
+    int check_rxov;
+    struct e1000_tx {
+        unsigned char header[256];
+        unsigned char data[0x10000];
+        uint16_t size;
+        unsigned char sum_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;
+        char ip;
+        char tcp;
+    } 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;
+} 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),
+};
+
+enum { PHY_R = 1, PHY_W = 2, PHY_RW = PHY_R | PHY_W };
+static 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,
+};
+
+static void
+ioport_map(PCIDevice *pci_dev, int region_num, uint32_t addr,
+           uint32_t size, int type)
+{
+    DBGOUT(IO, "e1000_ioport_map addr=0x%04x size=0x%08x\n", addr, size);
+}
+
+static void
+set_interrupt_cause(E1000State *s, int index, uint32_t val)
+{
+    if (val)
+        val |= E1000_ICR_INT_ASSERTED;
+    s->mac_reg[ICR] = 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
+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]);
+}
+
+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
+            s->phy_reg[addr] = data;
+    }
+    s->mac_reg[MDIC] = val | E1000_MDIC_READY;
+    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_SK & (val ^ oldval)))	// no clock edge
+        return;
+    if (!(E1000_EECD_SK & val)) {		// falling edge
+        s->eecd_state.bitnum_out++;
+        return;
+    }
+    if (!(val & E1000_EECD_CS)) {		// rising, no CS (EEPROM reset)
+        memset(&s->eecd_state, 0, sizeof s->eecd_state);
+        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 ((index = r >> E1000_EEPROM_RW_ADDR_SHIFT) > EEPROM_CHECKSUM_REG)
+        return 0;
+    return (s->eeprom_data[index] << E1000_EEPROM_RW_REG_DATA) |
+           E1000_EEPROM_RW_REG_DONE | r;
+}
+
+static unsigned int
+do_cksum(uint8_t *dp, uint8_t *de)
+{
+    unsigned int bsum[2] = {0, 0}, i, sum;
+
+    for (i = 1; dp < de; bsum[i^=1] += *dp++)
+        ;
+    sum = (bsum[0] << 8) + bsum[1];
+    sum = (sum >> 16) + (sum & 0xffff);
+    return ~(sum + (sum >> 16));
+}
+
+static void
+putsum(uint8_t *data, uint32_t n, uint32_t sloc, uint32_t css, uint32_t cse)
+{
+    if (cse && cse < n)
+        n = cse + 1;
+    if (sloc < n-1)
+        cpu_to_be16wu((uint16_t *)(data + sloc),
+                      do_cksum(data + css, data + n));
+}
+
+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) {
+        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_cpup((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) {
+            // add pseudo-header length before checksum calculation
+            sp = (uint16_t *)(tp->data + tp->tucso);
+            cpu_to_be16wu(sp, be16_to_cpup(sp) + len);
+        }
+        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);
+    qemu_send_packet(s->vc, 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))
+        tp->sum_needed = le32_to_cpu(dp->upper.data) >> 8;
+
+    addr = le64_to_cpu(dp->buffer_addr);
+    if (tp->tse) {
+        hdr = tp->hdr_len;
+        msh = hdr + tp->mss;
+    }
+    do {
+        bytes = split_size;
+        if (tp->size + bytes > msh)
+            bytes = msh - tp->size;
+        cpu_physical_memory_read(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);
+
+    if (!(txd_lower & E1000_TXD_CMD_EOP))
+        return;
+    if (tp->size > hdr)
+        xmit_seg(s);
+    tp->tso_frames = 0;
+    tp->sum_needed = 0;
+    tp->size = 0;
+}
+
+static uint32_t
+txdesc_writeback(target_phys_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);
+    cpu_physical_memory_write(base + ((char *)&dp->upper - (char *)dp),
+                              (void *)&dp->upper, sizeof(dp->upper));
+    return E1000_ICR_TXDW;
+}
+
+static void
+start_xmit(E1000State *s)
+{
+    target_phys_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 = ((uint64_t)s->mac_reg[TDBAH] << 32) + s->mac_reg[TDBAL] +
+               sizeof(struct e1000_tx_desc) * s->mac_reg[TDH];
+        cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
+
+        DBGOUT(TX, "index %d: %p : %x %x\n", s->mac_reg[TDH],
+               (void *)desc.buffer_addr, desc.lower.data,
+               desc.upper.data);
+
+        process_tx_desc(s, &desc);
+        cause |= txdesc_writeback(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 uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
+    static int mta_shift[] = {4, 3, 2, 0};
+    uint32_t f, rctl = s->mac_reg[RCTL], ra[2], *rp;
+
+    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 int
+e1000_can_receive(void *opaque)
+{
+    E1000State *s = opaque;
+
+    return (!(s->mac_reg[RCTL] & E1000_RCTL_EN) ||
+            s->mac_reg[RDH] != s->mac_reg[RDT]);
+}
+
+static void
+e1000_receive(void *opaque, const uint8_t *buf, int size)
+{
+    E1000State *s = opaque;
+    struct e1000_rx_desc desc;
+    target_phys_addr_t base;
+    unsigned int n, rdt;
+    uint32_t rdh_start;
+
+    if (!(s->mac_reg[RCTL] & E1000_RCTL_EN))
+        return;
+
+    if (size > s->rxbuf_size) {
+        DBGOUT(RX, "packet too large for buffers (%d > %d)\n", size,
+               s->rxbuf_size);
+        return;
+    }
+
+    if (!receive_filter(s, buf, size))
+        return;
+
+    rdh_start = s->mac_reg[RDH];
+    size += 4; // for the header
+    do {
+        if (s->mac_reg[RDH] == s->mac_reg[RDT] && s->check_rxov) {
+            set_ics(s, 0, E1000_ICS_RXO);
+            return;
+        }
+        base = ((uint64_t)s->mac_reg[RDBAH] << 32) + s->mac_reg[RDBAL] +
+               sizeof(desc) * s->mac_reg[RDH];
+        cpu_physical_memory_read(base, (void *)&desc, sizeof(desc));
+        desc.status |= E1000_RXD_STAT_DD;
+        if (desc.buffer_addr) {
+            cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr),
+                                      (void *)buf, size);
+            desc.length = cpu_to_le16(size);
+            desc.status |= E1000_RXD_STAT_EOP|E1000_RXD_STAT_IXSM;
+        } else // as per intel docs; skip descriptors with null buf addr
+            DBGOUT(RX, "Null RX descriptor!!\n");
+        cpu_physical_memory_write(base, (void *)&desc, sizeof(desc));
+
+        if (++s->mac_reg[RDH] * sizeof(desc) >= s->mac_reg[RDLEN])
+            s->mac_reg[RDH] = 0;
+        s->check_rxov = 1;
+        /* 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;
+        }
+    } while (desc.buffer_addr == 0);
+
+    s->mac_reg[GPRC]++;
+    s->mac_reg[TPR]++;
+    n = s->mac_reg[TORL];
+    if ((s->mac_reg[TORL] += size) < n)
+        s->mac_reg[TORH]++;
+
+    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->rxbuf_min_shift >=
+        s->mac_reg[RDLEN])
+        n |= E1000_ICS_RXDMT0;
+
+    set_ics(s, 0, n);
+}
+
+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->check_rxov = 0;
+    s->mac_reg[index] = val & 0xffff;
+}
+
+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),
+
+    [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,
+};
+enum { NREADOPS = sizeof(macreg_readops) / sizeof(*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),
+    [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,
+    [RA ... RA+31] = &mac_writereg,
+    [MTA ... MTA+127] = &mac_writereg,
+};
+enum { NWRITEOPS = sizeof(macreg_writeops) / sizeof(*macreg_writeops) };
+
+static void
+e1000_mmio_writel(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    E1000State *s = opaque;
+    unsigned int index = ((addr - s->mmio_base) & 0x1ffff) >> 2;
+
+    if (index < NWRITEOPS && macreg_writeops[index])
+        macreg_writeops[index](s, index, le32_to_cpu(val));
+    else if (index < NREADOPS && macreg_readops[index])
+        DBGOUT(MMIO, "e1000_mmio_writel RO %x: 0x%04x\n", index<<2, val);
+    else
+        DBGOUT(UNKNOWN, "MMIO unknown write addr=0x%08x,val=0x%08x\n",
+               index<<2, val);
+}
+
+static void
+e1000_mmio_writew(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    // emulate hw without byte enables: no RMW
+    e1000_mmio_writel(opaque, addr & ~3,
+                      cpu_to_le32(le16_to_cpu(val & 0xffff) << (8*(addr & 3))));
+}
+
+static void
+e1000_mmio_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
+{
+    // emulate hw without byte enables: no RMW
+    e1000_mmio_writel(opaque, addr & ~3,
+                      cpu_to_le32((val & 0xff)  << (8*(addr & 3))));
+}
+
+static uint32_t
+e1000_mmio_readl(void *opaque, target_phys_addr_t addr)
+{
+    E1000State *s = opaque;
+    unsigned int index = ((addr - s->mmio_base) & 0x1ffff) >> 2;
+
+    if (index < NREADOPS && macreg_readops[index])
+        return cpu_to_le32(macreg_readops[index](s, index));
+    DBGOUT(UNKNOWN, "MMIO unknown read addr=0x%08x\n", index<<2);
+    return 0;
+}
+
+static uint32_t
+e1000_mmio_readb(void *opaque, target_phys_addr_t addr)
+{
+    return (le32_to_cpu(e1000_mmio_readl(opaque, addr & ~3)) >>
+            (8 * (addr & 3))) & 0xff;
+}
+
+static uint32_t
+e1000_mmio_readw(void *opaque, target_phys_addr_t addr)
+{
+    return cpu_to_le16((le32_to_cpu(e1000_mmio_readl(opaque, addr & ~3)) >>
+                        (8 * (addr & 3))) & 0xffff);
+}
+
+int mac_regtosave[] = {
+    CTRL,	EECD,	EERD,	GPRC,	GPTC,	ICR,	ICS,	IMC,	IMS,
+    LEDCTL,	MANC,	MDIC,	MPC,	PBA,	RCTL,	RDBAH,	RDBAL,	RDH,
+    RDLEN,	RDT,	STATUS,	SWSM,	TCTL,	TDBAH,	TDBAL,	TDH,	TDLEN,
+    TDT,	TORH,	TORL,	TOTH,	TOTL,	TPR,	TPT,	TXDCTL,	WUFC,
+};
+enum { MAC_NSAVE = sizeof mac_regtosave/sizeof *mac_regtosave };
+
+struct {
+    int size;
+    int array0;
+} mac_regarraystosave[] = { {32, RA}, {128, MTA} };
+enum { MAC_NARRAYS = sizeof mac_regarraystosave/sizeof *mac_regarraystosave };
+
+static void
+nic_save(QEMUFile *f, void *opaque)
+{
+    E1000State *s = (E1000State *)opaque;
+    int i, j;
+
+    pci_device_save(&s->dev, f);
+    qemu_put_be32s(f, &s->instance);
+    qemu_put_be32s(f, &s->mmio_base);
+    qemu_put_be32s(f, &s->rxbuf_size);
+    qemu_put_be32s(f, &s->rxbuf_min_shift);
+    qemu_put_be32s(f, &s->eecd_state.val_in);
+    qemu_put_be16s(f, &s->eecd_state.bitnum_in);
+    qemu_put_be16s(f, &s->eecd_state.bitnum_out);
+    qemu_put_be16s(f, &s->eecd_state.reading);
+    qemu_put_be32s(f, &s->eecd_state.old_eecd);
+    qemu_put_8s(f, &s->tx.ipcss);
+    qemu_put_8s(f, &s->tx.ipcso);
+    qemu_put_be16s(f, &s->tx.ipcse);
+    qemu_put_8s(f, &s->tx.tucss);
+    qemu_put_8s(f, &s->tx.tucso);
+    qemu_put_be16s(f, &s->tx.tucse);
+    qemu_put_be32s(f, &s->tx.paylen);
+    qemu_put_8s(f, &s->tx.hdr_len);
+    qemu_put_be16s(f, &s->tx.mss);
+    qemu_put_be16s(f, &s->tx.size);
+    qemu_put_be16s(f, &s->tx.tso_frames);
+    qemu_put_8s(f, &s->tx.sum_needed);
+    qemu_put_8s(f, &s->tx.ip);
+    qemu_put_8s(f, &s->tx.tcp);
+    qemu_put_buffer(f, s->tx.header, sizeof s->tx.header);
+    qemu_put_buffer(f, s->tx.data, sizeof s->tx.data);
+    for (i = 0; i < 64; i++)
+        qemu_put_be16s(f, s->eeprom_data + i);
+    for (i = 0; i < 0x20; i++)
+        qemu_put_be16s(f, s->phy_reg + i);
+    for (i = 0; i < MAC_NSAVE; i++)
+        qemu_put_be32s(f, s->mac_reg + mac_regtosave[i]);
+    for (i = 0; i < MAC_NARRAYS; i++)
+        for (j = 0; j < mac_regarraystosave[i].size; j++)
+            qemu_put_be32s(f,
+                           s->mac_reg + mac_regarraystosave[i].array0 + j);
+}
+
+static int
+nic_load(QEMUFile *f, void *opaque, int version_id)
+{
+    E1000State *s = (E1000State *)opaque;
+    int i, j, ret;
+
+    if ((ret = pci_device_load(&s->dev, f)) < 0)
+        return ret;
+    qemu_get_be32s(f, &s->instance);
+    qemu_get_be32s(f, &s->mmio_base);
+    qemu_get_be32s(f, &s->rxbuf_size);
+    qemu_get_be32s(f, &s->rxbuf_min_shift);
+    qemu_get_be32s(f, &s->eecd_state.val_in);
+    qemu_get_be16s(f, &s->eecd_state.bitnum_in);
+    qemu_get_be16s(f, &s->eecd_state.bitnum_out);
+    qemu_get_be16s(f, &s->eecd_state.reading);
+    qemu_get_be32s(f, &s->eecd_state.old_eecd);
+    qemu_get_8s(f, &s->tx.ipcss);
+    qemu_get_8s(f, &s->tx.ipcso);
+    qemu_get_be16s(f, &s->tx.ipcse);
+    qemu_get_8s(f, &s->tx.tucss);
+    qemu_get_8s(f, &s->tx.tucso);
+    qemu_get_be16s(f, &s->tx.tucse);
+    qemu_get_be32s(f, &s->tx.paylen);
+    qemu_get_8s(f, &s->tx.hdr_len);
+    qemu_get_be16s(f, &s->tx.mss);
+    qemu_get_be16s(f, &s->tx.size);
+    qemu_get_be16s(f, &s->tx.tso_frames);
+    qemu_get_8s(f, &s->tx.sum_needed);
+    qemu_get_8s(f, &s->tx.ip);
+    qemu_get_8s(f, &s->tx.tcp);
+    qemu_get_buffer(f, s->tx.header, sizeof s->tx.header);
+    qemu_get_buffer(f, s->tx.data, sizeof s->tx.data);
+    for (i = 0; i < 64; i++)
+        qemu_get_be16s(f, s->eeprom_data + i);
+    for (i = 0; i < 0x20; i++)
+        qemu_get_be16s(f, s->phy_reg + i);
+    for (i = 0; i < MAC_NSAVE; i++)
+        qemu_get_be32s(f, s->mac_reg + mac_regtosave[i]);
+    for (i = 0; i < MAC_NARRAYS; i++)
+        for (j = 0; j < mac_regarraystosave[i].size; j++)
+            qemu_get_be32s(f,
+                           s->mac_reg + mac_regarraystosave[i].array0 + j);
+    return 0;
+}
+
+static 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,
+};
+
+static uint16_t phy_reg_init[] = {
+    [PHY_CTRL] = 0x1140,			[PHY_STATUS] = 0x796d, // link initially up
+    [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,
+};
+
+static 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,
+};
+
+/* PCI interface */
+
+static CPUWriteMemoryFunc *e1000_mmio_write[] = {
+    e1000_mmio_writeb,	e1000_mmio_writew,	e1000_mmio_writel
+};
+
+static CPUReadMemoryFunc *e1000_mmio_read[] = {
+    e1000_mmio_readb,	e1000_mmio_readw,	e1000_mmio_readl
+};
+
+static void
+e1000_mmio_map(PCIDevice *pci_dev, int region_num,
+                uint32_t addr, uint32_t size, int type)
+{
+    E1000State *d = (E1000State *)pci_dev;
+
+    DBGOUT(MMIO, "e1000_mmio_map addr=0x%08x 0x%08x\n", addr, size);
+
+    d->mmio_base = addr;
+    cpu_register_physical_memory(addr, PNPMMIO_SIZE, d->mmio_index);
+}
+
+void
+pci_e1000_init(PCIBus *bus, NICInfo *nd, int devfn)
+{
+    E1000State *d;
+    uint8_t *pci_conf;
+    static int instance;
+    uint16_t checksum = 0;
+    char *info_str = "e1000";
+    int i;
+
+    d = (E1000State *)pci_register_device(bus, "e1000",
+                sizeof(E1000State), devfn, NULL, NULL);
+
+    pci_conf = d->dev.config;
+    memset(pci_conf, 0, 256);
+
+    *(uint16_t *)(pci_conf+0x00) = cpu_to_le16(0x8086);
+    *(uint16_t *)(pci_conf+0x02) = cpu_to_le16(E1000_DEVID);
+    *(uint16_t *)(pci_conf+0x04) = cpu_to_le16(0x0407);
+    *(uint16_t *)(pci_conf+0x06) = cpu_to_le16(0x0010);
+    pci_conf[0x08] = 0x03;
+    pci_conf[0x0a] = 0x00; // ethernet network controller
+    pci_conf[0x0b] = 0x02;
+    pci_conf[0x0c] = 0x10;
+
+    pci_conf[0x3d] = 1; // interrupt pin 0
+
+    d->mmio_index = cpu_register_io_memory(0, e1000_mmio_read,
+            e1000_mmio_write, d);
+
+    pci_register_io_region((PCIDevice *)d, 0, PNPMMIO_SIZE,
+                           PCI_ADDRESS_SPACE_MEM, e1000_mmio_map);
+
+    pci_register_io_region((PCIDevice *)d, 1, IOPORT_SIZE,
+                           PCI_ADDRESS_SPACE_IO, ioport_map);
+
+    d->instance = instance++;
+
+    d->nd = nd;
+    memmove(d->eeprom_data, e1000_eeprom_template,
+        sizeof e1000_eeprom_template);
+    for (i = 0; i < 3; i++)
+        d->eeprom_data[i] = (nd->macaddr[2*i+1]<<8) | nd->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;
+
+    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);
+
+    d->vc = qemu_new_vlan_client(nd->vlan, e1000_receive,
+                                 e1000_can_receive, d);
+
+    snprintf(d->vc->info_str, sizeof(d->vc->info_str),
+             "%s macaddr=%02x:%02x:%02x:%02x:%02x:%02x", info_str,
+             d->nd->macaddr[0], d->nd->macaddr[1], d->nd->macaddr[2],
+             d->nd->macaddr[3], d->nd->macaddr[4], d->nd->macaddr[5]);
+
+    register_savevm(info_str, d->instance, 1, nic_save, nic_load, d);
+}