net: add Sun HME (Happy Meal Ethernet) on-board NIC

Enable it by default for the sparc64-softmmu configuration.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Acked-by: Artyom Tarasenko <atar4qemu@gmail.com>

3 files changed, 1008 insertions, 0 deletions

diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
index 7e87d0176b..4171af0b5d 100644
--- a/hw/net/Makefile.objs
+++ b/hw/net/Makefile.objs
@@ -26,6 +26,7 @@ common-obj-$(CONFIG_IMX_FEC) += imx_fec.o
 common-obj-$(CONFIG_CADENCE) += cadence_gem.o
 common-obj-$(CONFIG_STELLARIS_ENET) += stellaris_enet.o
 common-obj-$(CONFIG_LANCE) += lance.o
+common-obj-$(CONFIG_SUNHME) += sunhme.o
 common-obj-$(CONFIG_FTGMAC100) += ftgmac100.o
 common-obj-$(CONFIG_SUNGEM) += sungem.o
 
diff --git a/hw/net/sunhme.c b/hw/net/sunhme.c
new file mode 100644
index 0000000000..60277adcf1
--- /dev/null
+++ b/hw/net/sunhme.c
@@ -0,0 +1,978 @@
+/*
+ * QEMU Sun Happy Meal Ethernet emulation
+ *
+ * Copyright (c) 2017 Mark Cave-Ayland
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "hw/hw.h"
+#include "hw/pci/pci.h"
+#include "hw/net/mii.h"
+#include "net/net.h"
+#include "net/checksum.h"
+#include "net/eth.h"
+#include "sysemu/sysemu.h"
+#include "trace.h"
+
+#define HME_REG_SIZE                   0x8000
+
+#define HME_SEB_REG_SIZE               0x2000
+
+#define HME_SEBI_RESET                 0x0
+#define HME_SEB_RESET_ETX              0x1
+#define HME_SEB_RESET_ERX              0x2
+
+#define HME_SEBI_STAT                  0x100
+#define HME_SEBI_STAT_LINUXBUG         0x108
+#define HME_SEB_STAT_RXTOHOST          0x10000
+#define HME_SEB_STAT_MIFIRQ            0x800000
+#define HME_SEB_STAT_HOSTTOTX          0x1000000
+#define HME_SEB_STAT_TXALL             0x2000000
+
+#define HME_SEBI_IMASK                 0x104
+#define HME_SEBI_IMASK_LINUXBUG        0x10c
+
+#define HME_ETX_REG_SIZE               0x2000
+
+#define HME_ETXI_PENDING               0x0
+
+#define HME_ETXI_RING                  0x8
+#define HME_ETXI_RING_ADDR             0xffffff00
+#define HME_ETXI_RING_OFFSET           0xff
+
+#define HME_ETXI_RSIZE                 0x2c
+
+#define HME_ERX_REG_SIZE               0x2000
+
+#define HME_ERXI_CFG                   0x0
+#define HME_ERX_CFG_RINGSIZE           0x600
+#define HME_ERX_CFG_RINGSIZE_SHIFT     9
+#define HME_ERX_CFG_BYTEOFFSET         0x38
+#define HME_ERX_CFG_BYTEOFFSET_SHIFT   3
+#define HME_ERX_CFG_CSUMSTART          0x7f0000
+#define HME_ERX_CFG_CSUMSHIFT          16
+
+#define HME_ERXI_RING                  0x4
+#define HME_ERXI_RING_ADDR             0xffffff00
+#define HME_ERXI_RING_OFFSET           0xff
+
+#define HME_MAC_REG_SIZE               0x1000
+
+#define HME_MACI_TXCFG                 0x20c
+#define HME_MAC_TXCFG_ENABLE           0x1
+
+#define HME_MACI_RXCFG                 0x30c
+#define HME_MAC_RXCFG_ENABLE           0x1
+#define HME_MAC_RXCFG_PMISC            0x40
+#define HME_MAC_RXCFG_HENABLE          0x800
+
+#define HME_MACI_MACADDR2              0x318
+#define HME_MACI_MACADDR1              0x31c
+#define HME_MACI_MACADDR0              0x320
+
+#define HME_MACI_HASHTAB3              0x340
+#define HME_MACI_HASHTAB2              0x344
+#define HME_MACI_HASHTAB1              0x348
+#define HME_MACI_HASHTAB0              0x34c
+
+#define HME_MIF_REG_SIZE               0x20
+
+#define HME_MIFI_FO                    0xc
+#define HME_MIF_FO_ST                  0xc0000000
+#define HME_MIF_FO_ST_SHIFT            30
+#define HME_MIF_FO_OPC                 0x30000000
+#define HME_MIF_FO_OPC_SHIFT           28
+#define HME_MIF_FO_PHYAD               0x0f800000
+#define HME_MIF_FO_PHYAD_SHIFT         23
+#define HME_MIF_FO_REGAD               0x007c0000
+#define HME_MIF_FO_REGAD_SHIFT         18
+#define HME_MIF_FO_TAMSB               0x20000
+#define HME_MIF_FO_TALSB               0x10000
+#define HME_MIF_FO_DATA                0xffff
+
+#define HME_MIFI_CFG                   0x10
+#define HME_MIF_CFG_MDI0               0x100
+#define HME_MIF_CFG_MDI1               0x200
+
+#define HME_MIFI_IMASK                 0x14
+
+#define HME_MIFI_STAT                  0x18
+
+
+/* Wired HME PHY addresses */
+#define HME_PHYAD_INTERNAL     1
+#define HME_PHYAD_EXTERNAL     0
+
+#define MII_COMMAND_START      0x1
+#define MII_COMMAND_READ       0x2
+#define MII_COMMAND_WRITE      0x1
+
+#define TYPE_SUNHME "sunhme"
+#define SUNHME(obj) OBJECT_CHECK(SunHMEState, (obj), TYPE_SUNHME)
+
+/* Maximum size of buffer */
+#define HME_FIFO_SIZE          0x800
+
+/* Size of TX/RX descriptor */
+#define HME_DESC_SIZE          0x8
+
+#define HME_XD_OWN             0x80000000
+#define HME_XD_OFL             0x40000000
+#define HME_XD_SOP             0x40000000
+#define HME_XD_EOP             0x20000000
+#define HME_XD_RXLENMSK        0x3fff0000
+#define HME_XD_RXLENSHIFT      16
+#define HME_XD_RXCKSUM         0xffff
+#define HME_XD_TXLENMSK        0x00001fff
+#define HME_XD_TXCKSUM         0x10000000
+#define HME_XD_TXCSSTUFF       0xff00000
+#define HME_XD_TXCSSTUFFSHIFT  20
+#define HME_XD_TXCSSTART       0xfc000
+#define HME_XD_TXCSSTARTSHIFT  14
+
+#define HME_MII_REGS_SIZE      0x20
+
+typedef struct SunHMEState {
+    /*< private >*/
+    PCIDevice parent_obj;
+
+    NICState *nic;
+    NICConf conf;
+
+    MemoryRegion hme;
+    MemoryRegion sebreg;
+    MemoryRegion etxreg;
+    MemoryRegion erxreg;
+    MemoryRegion macreg;
+    MemoryRegion mifreg;
+
+    uint32_t sebregs[HME_SEB_REG_SIZE >> 2];
+    uint32_t etxregs[HME_ETX_REG_SIZE >> 2];
+    uint32_t erxregs[HME_ERX_REG_SIZE >> 2];
+    uint32_t macregs[HME_MAC_REG_SIZE >> 2];
+    uint32_t mifregs[HME_MIF_REG_SIZE >> 2];
+
+    uint16_t miiregs[HME_MII_REGS_SIZE];
+} SunHMEState;
+
+static Property sunhme_properties[] = {
+    DEFINE_NIC_PROPERTIES(SunHMEState, conf),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void sunhme_reset_tx(SunHMEState *s)
+{
+    /* Indicate TX reset complete */
+    s->sebregs[HME_SEBI_RESET] &= ~HME_SEB_RESET_ETX;
+}
+
+static void sunhme_reset_rx(SunHMEState *s)
+{
+    /* Indicate RX reset complete */
+    s->sebregs[HME_SEBI_RESET] &= ~HME_SEB_RESET_ERX;
+}
+
+static void sunhme_update_irq(SunHMEState *s)
+{
+    PCIDevice *d = PCI_DEVICE(s);
+    int level;
+
+    /* MIF interrupt mask (16-bit) */
+    uint32_t mifmask = ~(s->mifregs[HME_MIFI_IMASK >> 2]) & 0xffff;
+    uint32_t mif = s->mifregs[HME_MIFI_STAT >> 2] & mifmask;
+
+    /* Main SEB interrupt mask (include MIF status from above) */
+    uint32_t sebmask = ~(s->sebregs[HME_SEBI_IMASK >> 2]) &
+                       ~HME_SEB_STAT_MIFIRQ;
+    uint32_t seb = s->sebregs[HME_SEBI_STAT >> 2] & sebmask;
+    if (mif) {
+        seb |= HME_SEB_STAT_MIFIRQ;
+    }
+
+    level = (seb ? 1 : 0);
+    pci_set_irq(d, level);
+}
+
+static void sunhme_seb_write(void *opaque, hwaddr addr,
+                          uint64_t val, unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+
+    trace_sunhme_seb_write(addr, val);
+
+    /* Handly buggy Linux drivers before 4.13 which have
+       the wrong offsets for HME_SEBI_STAT and HME_SEBI_IMASK */
+    switch (addr) {
+    case HME_SEBI_STAT_LINUXBUG:
+        addr = HME_SEBI_STAT;
+        break;
+    case HME_SEBI_IMASK_LINUXBUG:
+        addr = HME_SEBI_IMASK;
+        break;
+    default:
+        break;
+    }
+
+    switch (addr) {
+    case HME_SEBI_RESET:
+        if (val & HME_SEB_RESET_ETX) {
+            sunhme_reset_tx(s);
+        }
+        if (val & HME_SEB_RESET_ERX) {
+            sunhme_reset_rx(s);
+        }
+        val = s->sebregs[HME_SEBI_RESET >> 2];
+        break;
+    }
+
+    s->sebregs[addr >> 2] = val;
+}
+
+static uint64_t sunhme_seb_read(void *opaque, hwaddr addr,
+                             unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+    uint64_t val;
+
+    /* Handly buggy Linux drivers before 4.13 which have
+       the wrong offsets for HME_SEBI_STAT and HME_SEBI_IMASK */
+    switch (addr) {
+    case HME_SEBI_STAT_LINUXBUG:
+        addr = HME_SEBI_STAT;
+        break;
+    case HME_SEBI_IMASK_LINUXBUG:
+        addr = HME_SEBI_IMASK;
+        break;
+    default:
+        break;
+    }
+
+    val = s->sebregs[addr >> 2];
+
+    switch (addr) {
+    case HME_SEBI_STAT:
+        /* Autoclear status (except MIF) */
+        s->sebregs[HME_SEBI_STAT >> 2] &= HME_SEB_STAT_MIFIRQ;
+        sunhme_update_irq(s);
+        break;
+    }
+
+    trace_sunhme_seb_read(addr, val);
+
+    return val;
+}
+
+static const MemoryRegionOps sunhme_seb_ops = {
+    .read = sunhme_seb_read,
+    .write = sunhme_seb_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static void sunhme_transmit(SunHMEState *s);
+
+static void sunhme_etx_write(void *opaque, hwaddr addr,
+                          uint64_t val, unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+
+    trace_sunhme_etx_write(addr, val);
+
+    switch (addr) {
+    case HME_ETXI_PENDING:
+        if (val) {
+            sunhme_transmit(s);
+        }
+        break;
+    }
+
+    s->etxregs[addr >> 2] = val;
+}
+
+static uint64_t sunhme_etx_read(void *opaque, hwaddr addr,
+                             unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+    uint64_t val;
+
+    val = s->etxregs[addr >> 2];
+
+    trace_sunhme_etx_read(addr, val);
+
+    return val;
+}
+
+static const MemoryRegionOps sunhme_etx_ops = {
+    .read = sunhme_etx_read,
+    .write = sunhme_etx_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static void sunhme_erx_write(void *opaque, hwaddr addr,
+                          uint64_t val, unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+
+    trace_sunhme_erx_write(addr, val);
+
+    s->erxregs[addr >> 2] = val;
+}
+
+static uint64_t sunhme_erx_read(void *opaque, hwaddr addr,
+                             unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+    uint64_t val;
+
+    val = s->erxregs[addr >> 2];
+
+    trace_sunhme_erx_read(addr, val);
+
+    return val;
+}
+
+static const MemoryRegionOps sunhme_erx_ops = {
+    .read = sunhme_erx_read,
+    .write = sunhme_erx_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static void sunhme_mac_write(void *opaque, hwaddr addr,
+                          uint64_t val, unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+
+    trace_sunhme_mac_write(addr, val);
+
+    s->macregs[addr >> 2] = val;
+}
+
+static uint64_t sunhme_mac_read(void *opaque, hwaddr addr,
+                             unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+    uint64_t val;
+
+    val = s->macregs[addr >> 2];
+
+    trace_sunhme_mac_read(addr, val);
+
+    return val;
+}
+
+static const MemoryRegionOps sunhme_mac_ops = {
+    .read = sunhme_mac_read,
+    .write = sunhme_mac_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static void sunhme_mii_write(SunHMEState *s, uint8_t reg, uint16_t data)
+{
+    trace_sunhme_mii_write(reg, data);
+
+    switch (reg) {
+    case MII_BMCR:
+        if (data & MII_BMCR_RESET) {
+            /* Autoclear reset bit, enable auto negotiation */
+            data &= ~MII_BMCR_RESET;
+            data |= MII_BMCR_AUTOEN;
+        }
+        if (data & MII_BMCR_ANRESTART) {
+            /* Autoclear auto negotiation restart */
+            data &= ~MII_BMCR_ANRESTART;
+
+            /* Indicate negotiation complete */
+            s->miiregs[MII_BMSR] |= MII_BMSR_AN_COMP;
+
+            if (!qemu_get_queue(s->nic)->link_down) {
+                s->miiregs[MII_ANLPAR] |= MII_ANLPAR_TXFD;
+                s->miiregs[MII_BMSR] |= MII_BMSR_LINK_ST;
+            }
+        }
+        break;
+    }
+
+    s->miiregs[reg] = data;
+}
+
+static uint16_t sunhme_mii_read(SunHMEState *s, uint8_t reg)
+{
+    uint16_t data = s->miiregs[reg];
+
+    trace_sunhme_mii_read(reg, data);
+
+    return data;
+}
+
+static void sunhme_mif_write(void *opaque, hwaddr addr,
+                          uint64_t val, unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+    uint8_t cmd, reg;
+    uint16_t data;
+
+    trace_sunhme_mif_write(addr, val);
+
+    switch (addr) {
+    case HME_MIFI_CFG:
+        /* Mask the read-only bits */
+        val &= ~(HME_MIF_CFG_MDI0 | HME_MIF_CFG_MDI1);
+        val |= s->mifregs[HME_MIFI_CFG >> 2] &
+               (HME_MIF_CFG_MDI0 | HME_MIF_CFG_MDI1);
+        break;
+    case HME_MIFI_FO:
+        /* Detect start of MII command */
+        if ((val & HME_MIF_FO_ST) >> HME_MIF_FO_ST_SHIFT
+                != MII_COMMAND_START) {
+            val |= HME_MIF_FO_TALSB;
+            break;
+        }
+
+        /* Internal phy only */
+        if ((val & HME_MIF_FO_PHYAD) >> HME_MIF_FO_PHYAD_SHIFT
+                != HME_PHYAD_INTERNAL) {
+            val |= HME_MIF_FO_TALSB;
+            break;
+        }
+
+        cmd = (val & HME_MIF_FO_OPC) >> HME_MIF_FO_OPC_SHIFT;
+        reg = (val & HME_MIF_FO_REGAD) >> HME_MIF_FO_REGAD_SHIFT;
+        data = (val & HME_MIF_FO_DATA);
+
+        switch (cmd) {
+        case MII_COMMAND_WRITE:
+            sunhme_mii_write(s, reg, data);
+            break;
+
+        case MII_COMMAND_READ:
+            val &= ~HME_MIF_FO_DATA;
+            val |= sunhme_mii_read(s, reg);
+            break;
+        }
+
+        val |= HME_MIF_FO_TALSB;
+        break;
+    }
+
+    s->mifregs[addr >> 2] = val;
+}
+
+static uint64_t sunhme_mif_read(void *opaque, hwaddr addr,
+                             unsigned size)
+{
+    SunHMEState *s = SUNHME(opaque);
+    uint64_t val;
+
+    val = s->mifregs[addr >> 2];
+
+    switch (addr) {
+    case HME_MIFI_STAT:
+        /* Autoclear MIF interrupt status */
+        s->mifregs[HME_MIFI_STAT >> 2] = 0;
+        sunhme_update_irq(s);
+        break;
+    }
+
+    trace_sunhme_mif_read(addr, val);
+
+    return val;
+}
+
+static const MemoryRegionOps sunhme_mif_ops = {
+    .read = sunhme_mif_read,
+    .write = sunhme_mif_write,
+    .endianness = DEVICE_LITTLE_ENDIAN,
+    .valid = {
+        .min_access_size = 4,
+        .max_access_size = 4,
+    },
+};
+
+static void sunhme_transmit_frame(SunHMEState *s, uint8_t *buf, int size)
+{
+    qemu_send_packet(qemu_get_queue(s->nic), buf, size);
+}
+
+static inline int sunhme_get_tx_ring_count(SunHMEState *s)
+{
+    return (s->etxregs[HME_ETXI_RSIZE >> 2] + 1) << 4;
+}
+
+static inline int sunhme_get_tx_ring_nr(SunHMEState *s)
+{
+    return s->etxregs[HME_ETXI_RING >> 2] & HME_ETXI_RING_OFFSET;
+}
+
+static inline void sunhme_set_tx_ring_nr(SunHMEState *s, int i)
+{
+    uint32_t ring = s->etxregs[HME_ETXI_RING >> 2] & ~HME_ETXI_RING_OFFSET;
+    ring |= i & HME_ETXI_RING_OFFSET;
+
+    s->etxregs[HME_ETXI_RING >> 2] = ring;
+}
+
+static void sunhme_transmit(SunHMEState *s)
+{
+    PCIDevice *d = PCI_DEVICE(s);
+    dma_addr_t tb, addr;
+    uint32_t intstatus, status, buffer, sum = 0;
+    int cr, nr, len, xmit_pos, csum_offset = 0, csum_stuff_offset = 0;
+    uint16_t csum = 0;
+    uint8_t xmit_buffer[HME_FIFO_SIZE];
+
+    tb = s->etxregs[HME_ETXI_RING >> 2] & HME_ETXI_RING_ADDR;
+    nr = sunhme_get_tx_ring_count(s);
+    cr = sunhme_get_tx_ring_nr(s);
+
+    pci_dma_read(d, tb + cr * HME_DESC_SIZE, &status, 4);
+    pci_dma_read(d, tb + cr * HME_DESC_SIZE + 4, &buffer, 4);
+
+    xmit_pos = 0;
+    while (status & HME_XD_OWN) {
+        trace_sunhme_tx_desc(buffer, status, cr, nr);
+
+        /* Copy data into transmit buffer */
+        addr = buffer;
+        len = status & HME_XD_TXLENMSK;
+
+        if (xmit_pos + len > HME_FIFO_SIZE) {
+            len = HME_FIFO_SIZE - xmit_pos;
+        }
+
+        pci_dma_read(d, addr, &xmit_buffer[xmit_pos], len);
+        xmit_pos += len;
+
+        /* Detect start of packet for TX checksum */
+        if (status & HME_XD_SOP) {
+            sum = 0;
+            csum_offset = (status & HME_XD_TXCSSTART) >> HME_XD_TXCSSTARTSHIFT;
+            csum_stuff_offset = (status & HME_XD_TXCSSTUFF) >>
+                                HME_XD_TXCSSTUFFSHIFT;
+        }
+
+        if (status & HME_XD_TXCKSUM) {
+            /* Only start calculation from csum_offset */
+            if (xmit_pos - len <= csum_offset && xmit_pos > csum_offset) {
+                sum += net_checksum_add(xmit_pos - csum_offset,
+                                        xmit_buffer + csum_offset);
+                trace_sunhme_tx_xsum_add(csum_offset, xmit_pos - csum_offset);
+            } else {
+                sum += net_checksum_add(len, xmit_buffer + xmit_pos - len);
+                trace_sunhme_tx_xsum_add(xmit_pos - len, len);
+            }
+        }
+
+        /* Detect end of packet for TX checksum */
+        if (status & HME_XD_EOP) {
+            /* Stuff the checksum if required */
+            if (status & HME_XD_TXCKSUM) {
+                csum = net_checksum_finish(sum);
+                stw_be_p(xmit_buffer + csum_stuff_offset, csum);
+                trace_sunhme_tx_xsum_stuff(csum, csum_stuff_offset);
+            }
+
+            if (s->macregs[HME_MACI_TXCFG >> 2] & HME_MAC_TXCFG_ENABLE) {
+                sunhme_transmit_frame(s, xmit_buffer, xmit_pos);
+                trace_sunhme_tx_done(xmit_pos);
+            }
+        }
+
+        /* Update status */
+        status &= ~HME_XD_OWN;
+        pci_dma_write(d, tb + cr * HME_DESC_SIZE, &status, 4);
+
+        /* Move onto next descriptor */
+        cr++;
+        if (cr >= nr) {
+            cr = 0;
+        }
+        sunhme_set_tx_ring_nr(s, cr);
+
+        pci_dma_read(d, tb + cr * HME_DESC_SIZE, &status, 4);
+        pci_dma_read(d, tb + cr * HME_DESC_SIZE + 4, &buffer, 4);
+
+        /* Indicate TX complete */
+        intstatus = s->sebregs[HME_SEBI_STAT >> 2];
+        intstatus |= HME_SEB_STAT_HOSTTOTX;
+        s->sebregs[HME_SEBI_STAT >> 2] = intstatus;
+
+        /* Autoclear TX pending */
+        s->etxregs[HME_ETXI_PENDING >> 2] = 0;
+
+        sunhme_update_irq(s);
+    }
+
+    /* TX FIFO now clear */
+    intstatus = s->sebregs[HME_SEBI_STAT >> 2];
+    intstatus |= HME_SEB_STAT_TXALL;
+    s->sebregs[HME_SEBI_STAT >> 2] = intstatus;
+    sunhme_update_irq(s);
+}
+
+static int sunhme_can_receive(NetClientState *nc)
+{
+    SunHMEState *s = qemu_get_nic_opaque(nc);
+
+    return s->macregs[HME_MAC_RXCFG_ENABLE >> 2] & HME_MAC_RXCFG_ENABLE;
+}
+
+static void sunhme_link_status_changed(NetClientState *nc)
+{
+    SunHMEState *s = qemu_get_nic_opaque(nc);
+
+    if (nc->link_down) {
+        s->miiregs[MII_ANLPAR] &= ~MII_ANLPAR_TXFD;
+        s->miiregs[MII_BMSR] &= ~MII_BMSR_LINK_ST;
+    } else {
+        s->miiregs[MII_ANLPAR] |= MII_ANLPAR_TXFD;
+        s->miiregs[MII_BMSR] |= MII_BMSR_LINK_ST;
+    }
+
+    /* Exact bits unknown */
+    s->mifregs[HME_MIFI_STAT >> 2] = 0xffff;
+    sunhme_update_irq(s);
+}
+
+static inline int sunhme_get_rx_ring_count(SunHMEState *s)
+{
+    uint32_t rings = (s->erxregs[HME_ERXI_CFG >> 2] & HME_ERX_CFG_RINGSIZE)
+                      >> HME_ERX_CFG_RINGSIZE_SHIFT;
+
+    switch (rings) {
+    case 0:
+        return 32;
+    case 1:
+        return 64;
+    case 2:
+        return 128;
+    case 3:
+        return 256;
+    }
+
+    return 0;
+}
+
+static inline int sunhme_get_rx_ring_nr(SunHMEState *s)
+{
+    return s->erxregs[HME_ERXI_RING >> 2] & HME_ERXI_RING_OFFSET;
+}
+
+static inline void sunhme_set_rx_ring_nr(SunHMEState *s, int i)
+{
+    uint32_t ring = s->erxregs[HME_ERXI_RING >> 2] & ~HME_ERXI_RING_OFFSET;
+    ring |= i & HME_ERXI_RING_OFFSET;
+
+    s->erxregs[HME_ERXI_RING >> 2] = ring;
+}
+
+#define POLYNOMIAL_LE 0xedb88320
+static uint32_t sunhme_crc32_le(const uint8_t *p, int len)
+{
+    uint32_t crc;
+    int carry, i, j;
+    uint8_t b;
+
+    crc = 0xffffffff;
+    for (i = 0; i < len; i++) {
+        b = *p++;
+        for (j = 0; j < 8; j++) {
+            carry = (crc & 0x1) ^ (b & 0x01);
+            crc >>= 1;
+            b >>= 1;
+            if (carry) {
+                crc = crc ^ POLYNOMIAL_LE;
+            }
+        }
+    }
+
+    return crc;
+}
+
+#define MIN_BUF_SIZE 60
+
+static ssize_t sunhme_receive(NetClientState *nc, const uint8_t *buf,
+                              size_t size)
+{
+    SunHMEState *s = qemu_get_nic_opaque(nc);
+    PCIDevice *d = PCI_DEVICE(s);
+    dma_addr_t rb, addr;
+    uint32_t intstatus, status, buffer, buffersize, sum;
+    uint16_t csum;
+    uint8_t buf1[60];
+    int nr, cr, len, rxoffset, csum_offset;
+
+    trace_sunhme_rx_incoming(size);
+
+    /* Do nothing if MAC RX disabled */
+    if (!(s->macregs[HME_MACI_RXCFG >> 2] & HME_MAC_RXCFG_ENABLE)) {
+        return -1;
+    }
+
+    trace_sunhme_rx_filter_destmac(buf[0], buf[1], buf[2],
+                                   buf[3], buf[4], buf[5]);
+
+    /* Check destination MAC address */
+    if (!(s->macregs[HME_MACI_RXCFG >> 2] & HME_MAC_RXCFG_PMISC)) {
+        /* Try and match local MAC address */
+        if (((s->macregs[HME_MACI_MACADDR0 >> 2] & 0xff00) >> 8) == buf[0] &&
+             (s->macregs[HME_MACI_MACADDR0 >> 2] & 0xff) == buf[1] &&
+            ((s->macregs[HME_MACI_MACADDR1 >> 2] & 0xff00) >> 8) == buf[2] &&
+             (s->macregs[HME_MACI_MACADDR1 >> 2] & 0xff) == buf[3] &&
+            ((s->macregs[HME_MACI_MACADDR2 >> 2] & 0xff00) >> 8) == buf[4] &&
+             (s->macregs[HME_MACI_MACADDR2 >> 2] & 0xff) == buf[5]) {
+            /* Matched local MAC address */
+            trace_sunhme_rx_filter_local_match();
+        } else if (buf[0] == 0xff && buf[1] == 0xff && buf[2] == 0xff &&
+                   buf[3] == 0xff && buf[4] == 0xff && buf[5] == 0xff) {
+            /* Matched broadcast address */
+            trace_sunhme_rx_filter_bcast_match();
+        } else if (s->macregs[HME_MACI_RXCFG >> 2] & HME_MAC_RXCFG_HENABLE) {
+            /* Didn't match local address, check hash filter */
+            int mcast_idx = sunhme_crc32_le(buf, 6) >> 26;
+            if (!(s->macregs[(HME_MACI_HASHTAB0 >> 2) - (mcast_idx >> 4)] &
+                    (1 << (mcast_idx & 0xf)))) {
+                /* Didn't match hash filter */
+                trace_sunhme_rx_filter_hash_nomatch();
+                trace_sunhme_rx_filter_reject();
+                return 0;
+            } else {
+                trace_sunhme_rx_filter_hash_match();
+            }
+        } else {
+            /* Not for us */
+            trace_sunhme_rx_filter_reject();
+            return 0;
+        }
+    } else {
+        trace_sunhme_rx_filter_promisc_match();
+    }
+
+    trace_sunhme_rx_filter_accept();
+
+    /* If too small buffer, then expand it */
+    if (size < MIN_BUF_SIZE) {
+        memcpy(buf1, buf, size);
+        memset(buf1 + size, 0, MIN_BUF_SIZE - size);
+        buf = buf1;
+        size = MIN_BUF_SIZE;
+    }
+
+    rb = s->erxregs[HME_ERXI_RING >> 2] & HME_ERXI_RING_ADDR;
+    nr = sunhme_get_rx_ring_count(s);
+    cr = sunhme_get_rx_ring_nr(s);
+
+    pci_dma_read(d, rb + cr * HME_DESC_SIZE, &status, 4);
+    pci_dma_read(d, rb + cr * HME_DESC_SIZE + 4, &buffer, 4);
+
+    rxoffset = (s->erxregs[HME_ERXI_CFG >> 2] & HME_ERX_CFG_BYTEOFFSET) >>
+                HME_ERX_CFG_BYTEOFFSET_SHIFT;
+
+    addr = buffer + rxoffset;
+    buffersize = (status & HME_XD_RXLENMSK) >> HME_XD_RXLENSHIFT;
+
+    /* Detect receive overflow */
+    len = size;
+    if (size > buffersize) {
+        status |= HME_XD_OFL;
+        len = buffersize;
+    }
+
+    pci_dma_write(d, addr, buf, len);
+
+    trace_sunhme_rx_desc(buffer, rxoffset, status, len, cr, nr);
+
+    /* Calculate the receive checksum */
+    csum_offset = (s->erxregs[HME_ERXI_CFG >> 2] & HME_ERX_CFG_CSUMSTART) >>
+                  HME_ERX_CFG_CSUMSHIFT << 1;
+    sum = 0;
+    sum += net_checksum_add(len - csum_offset, (uint8_t *)buf + csum_offset);
+    csum = net_checksum_finish(sum);
+
+    trace_sunhme_rx_xsum_calc(csum);
+
+    /* Update status */
+    status &= ~HME_XD_OWN;
+    status &= ~HME_XD_RXLENMSK;
+    status |= len << HME_XD_RXLENSHIFT;
+    status &= ~HME_XD_RXCKSUM;
+    status |= csum;
+
+    pci_dma_write(d, rb + cr * HME_DESC_SIZE, &status, 4);
+
+    cr++;
+    if (cr >= nr) {
+        cr = 0;
+    }
+
+    sunhme_set_rx_ring_nr(s, cr);
+
+    /* Indicate RX complete */
+    intstatus = s->sebregs[HME_SEBI_STAT >> 2];
+    intstatus |= HME_SEB_STAT_RXTOHOST;
+    s->sebregs[HME_SEBI_STAT >> 2] = intstatus;
+
+    sunhme_update_irq(s);
+
+    return len;
+}
+
+static NetClientInfo net_sunhme_info = {
+    .type = NET_CLIENT_DRIVER_NIC,
+    .size = sizeof(NICState),
+    .can_receive = sunhme_can_receive,
+    .receive = sunhme_receive,
+    .link_status_changed = sunhme_link_status_changed,
+};
+
+static void sunhme_realize(PCIDevice *pci_dev, Error **errp)
+{
+    SunHMEState *s = SUNHME(pci_dev);
+    DeviceState *d = DEVICE(pci_dev);
+    uint8_t *pci_conf;
+
+    pci_conf = pci_dev->config;
+    pci_conf[PCI_INTERRUPT_PIN] = 1;    /* interrupt pin A */
+
+    memory_region_init(&s->hme, OBJECT(pci_dev), "sunhme", HME_REG_SIZE);
+    pci_register_bar(pci_dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, &s->hme);
+
+    memory_region_init_io(&s->sebreg, OBJECT(pci_dev), &sunhme_seb_ops, s,
+                          "sunhme.seb", HME_SEB_REG_SIZE);
+    memory_region_add_subregion(&s->hme, 0, &s->sebreg);
+
+    memory_region_init_io(&s->etxreg, OBJECT(pci_dev), &sunhme_etx_ops, s,
+                          "sunhme.etx", HME_ETX_REG_SIZE);
+    memory_region_add_subregion(&s->hme, 0x2000, &s->etxreg);
+
+    memory_region_init_io(&s->erxreg, OBJECT(pci_dev), &sunhme_erx_ops, s,
+                          "sunhme.erx", HME_ERX_REG_SIZE);
+    memory_region_add_subregion(&s->hme, 0x4000, &s->erxreg);
+
+    memory_region_init_io(&s->macreg, OBJECT(pci_dev), &sunhme_mac_ops, s,
+                          "sunhme.mac", HME_MAC_REG_SIZE);
+    memory_region_add_subregion(&s->hme, 0x6000, &s->macreg);
+
+    memory_region_init_io(&s->mifreg, OBJECT(pci_dev), &sunhme_mif_ops, s,
+                          "sunhme.mif", HME_MIF_REG_SIZE);
+    memory_region_add_subregion(&s->hme, 0x7000, &s->mifreg);
+
+    qemu_macaddr_default_if_unset(&s->conf.macaddr);
+    s->nic = qemu_new_nic(&net_sunhme_info, &s->conf,
+                          object_get_typename(OBJECT(d)), d->id, s);
+    qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
+}
+
+static void sunhme_instance_init(Object *obj)
+{
+    SunHMEState *s = SUNHME(obj);
+
+    device_add_bootindex_property(obj, &s->conf.bootindex,
+                                  "bootindex", "/ethernet-phy@0",
+                                  DEVICE(obj), NULL);
+}
+
+static void sunhme_reset(DeviceState *ds)
+{
+    SunHMEState *s = SUNHME(ds);
+
+    /* Configure internal transceiver */
+    s->mifregs[HME_MIFI_CFG >> 2] |= HME_MIF_CFG_MDI0;
+
+    /* Advetise auto, 100Mbps FD */
+    s->miiregs[MII_ANAR] = MII_ANAR_TXFD;
+    s->miiregs[MII_BMSR] = MII_BMSR_AUTONEG | MII_BMSR_100TX_FD |
+                           MII_BMSR_AN_COMP;
+
+    if (!qemu_get_queue(s->nic)->link_down) {
+        s->miiregs[MII_ANLPAR] |= MII_ANLPAR_TXFD;
+        s->miiregs[MII_BMSR] |= MII_BMSR_LINK_ST;
+    }
+
+    /* Set manufacturer */
+    s->miiregs[MII_PHYID1] = DP83840_PHYID1;
+    s->miiregs[MII_PHYID2] = DP83840_PHYID2;
+
+    /* Configure default interrupt mask */
+    s->mifregs[HME_MIFI_IMASK >> 2] = 0xffff;
+    s->sebregs[HME_SEBI_IMASK >> 2] = 0xff7fffff;
+}
+
+static const VMStateDescription vmstate_hme = {
+    .name = "sunhme",
+    .version_id = 0,
+    .minimum_version_id = 0,
+    .fields = (VMStateField[]) {
+        VMSTATE_PCI_DEVICE(parent_obj, SunHMEState),
+        VMSTATE_MACADDR(conf.macaddr, SunHMEState),
+        VMSTATE_UINT32_ARRAY(sebregs, SunHMEState, (HME_SEB_REG_SIZE >> 2)),
+        VMSTATE_UINT32_ARRAY(etxregs, SunHMEState, (HME_ETX_REG_SIZE >> 2)),
+        VMSTATE_UINT32_ARRAY(erxregs, SunHMEState, (HME_ERX_REG_SIZE >> 2)),
+        VMSTATE_UINT32_ARRAY(macregs, SunHMEState, (HME_MAC_REG_SIZE >> 2)),
+        VMSTATE_UINT32_ARRAY(mifregs, SunHMEState, (HME_MIF_REG_SIZE >> 2)),
+        VMSTATE_UINT16_ARRAY(miiregs, SunHMEState, HME_MII_REGS_SIZE),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void sunhme_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->realize = sunhme_realize;
+    k->vendor_id = PCI_VENDOR_ID_SUN;
+    k->device_id = PCI_DEVICE_ID_SUN_HME;
+    k->class_id = PCI_CLASS_NETWORK_ETHERNET;
+    dc->vmsd = &vmstate_hme;
+    dc->reset = sunhme_reset;
+    dc->props = sunhme_properties;
+    set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
+}
+
+static const TypeInfo sunhme_info = {
+    .name          = TYPE_SUNHME,
+    .parent        = TYPE_PCI_DEVICE,
+    .class_init    = sunhme_class_init,
+    .instance_size = sizeof(SunHMEState),
+    .instance_init = sunhme_instance_init,
+};
+
+static void sunhme_register_types(void)
+{
+    type_register_static(&sunhme_info);
+}
+
+type_init(sunhme_register_types)
diff --git a/hw/net/trace-events b/hw/net/trace-events
index 5f816ef58e..45c4e9fba0 100644
--- a/hw/net/trace-events
+++ b/hw/net/trace-events
@@ -322,3 +322,32 @@ sungem_mmio_mif_write(uint64_t addr, uint64_t val) "MMIO mif write to 0x%"PRIx64
 sungem_mmio_mif_read(uint64_t addr, uint64_t val) "MMIO mif read from 0x%"PRIx64" val=0x%"PRIx64
 sungem_mmio_pcs_write(uint64_t addr, uint64_t val) "MMIO pcs write to 0x%"PRIx64" val=0x%"PRIx64
 sungem_mmio_pcs_read(uint64_t addr, uint64_t val) "MMIO pcs read from 0x%"PRIx64" val=0x%"PRIx64
+
+# hw/net/sunhme.c
+sunhme_seb_write(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_seb_read(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_etx_write(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_etx_read(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_erx_write(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_erx_read(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_mac_write(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_mac_read(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_mii_write(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_mii_read(uint8_t addr, uint16_t value) "addr 0x%x value 0x%x"
+sunhme_mif_write(uint8_t addr, uint16_t value) "addr 0x%x value 0x%x"
+sunhme_mif_read(uint64_t addr, uint64_t value) "addr 0x%"PRIx64" value 0x%"PRIx64
+sunhme_tx_desc(uint64_t buffer, uint32_t status, int cr, int nr) "addr 0x%"PRIx64" status 0x%"PRIx32 " (ring %d/%d)"
+sunhme_tx_xsum_add(int offset, int len) "adding xsum at offset %d, len %d"
+sunhme_tx_xsum_stuff(uint16_t xsum, int offset) "stuffing xsum 0x%x at offset %d"
+sunhme_tx_done(int len) "successfully transmitted frame with len %d"
+sunhme_rx_incoming(size_t len) "received incoming frame with len %zu"
+sunhme_rx_filter_destmac(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5) "received frame for MAC: %02x:%02x:%02x:%02x:%02x:%02x"
+sunhme_rx_filter_local_match(void) "incoming frame matches local MAC address"
+sunhme_rx_filter_bcast_match(void) "incoming frame matches broadcast MAC address"
+sunhme_rx_filter_hash_nomatch(void) "incoming MAC address not in hash table"
+sunhme_rx_filter_hash_match(void) "incoming MAC address found in hash table"
+sunhme_rx_filter_promisc_match(void) "incoming frame accepted due to promiscuous mode"
+sunhme_rx_filter_reject(void) "rejecting incoming frame"
+sunhme_rx_filter_accept(void) "accepting incoming frame"
+sunhme_rx_desc(uint32_t addr, int offset, uint32_t status, int len, int cr, int nr) "addr 0x%"PRIx32"(+0x%x) status 0x%"PRIx32 " len %d (ring %d/%d)"
+sunhme_rx_xsum_calc(uint16_t xsum) "calculated incoming xsum as 0x%x"