*
* This code is licensed under the GPL.
*/
+
+#include "qemu/osdep.h"
+#include "hw/irq.h"
#include "hw/sysbus.h"
#include "net/net.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
#include <zlib.h>
//#define DEBUG_STELLARIS_ENET 1
#define SE_TCTL_CRC 0x04
#define SE_TCTL_DUPLEX 0x08
+#define TYPE_STELLARIS_ENET "stellaris_enet"
+#define STELLARIS_ENET(obj) \
+ OBJECT_CHECK(stellaris_enet_state, (obj), TYPE_STELLARIS_ENET)
+
+typedef struct {
+ uint8_t data[2048];
+ uint32_t len;
+} StellarisEnetRxFrame;
+
typedef struct {
- SysBusDevice busdev;
+ SysBusDevice parent_obj;
+
uint32_t ris;
uint32_t im;
uint32_t rctl;
uint32_t mtxd;
uint32_t mrxd;
uint32_t np;
- int tx_frame_len;
- int tx_fifo_len;
+ uint32_t tx_fifo_len;
uint8_t tx_fifo[2048];
/* Real hardware has a 2k fifo, which works out to be at most 31 packets.
We implement a full 31 packet fifo. */
- struct {
- uint8_t data[2048];
- int len;
- } rx[31];
- uint8_t *rx_fifo;
- int rx_fifo_len;
- int next_packet;
+ StellarisEnetRxFrame rx[31];
+ uint32_t rx_fifo_offset;
+ uint32_t next_packet;
NICState *nic;
NICConf conf;
qemu_irq irq;
MemoryRegion mmio;
} stellaris_enet_state;
+static const VMStateDescription vmstate_rx_frame = {
+ .name = "stellaris_enet/rx_frame",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8_ARRAY(data, StellarisEnetRxFrame, 2048),
+ VMSTATE_UINT32(len, StellarisEnetRxFrame),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static int stellaris_enet_post_load(void *opaque, int version_id)
+{
+ stellaris_enet_state *s = opaque;
+ int i;
+
+ /* Sanitize inbound state. Note that next_packet is an index but
+ * np is a size; hence their valid upper bounds differ.
+ */
+ if (s->next_packet >= ARRAY_SIZE(s->rx)) {
+ return -1;
+ }
+
+ if (s->np > ARRAY_SIZE(s->rx)) {
+ return -1;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(s->rx); i++) {
+ if (s->rx[i].len > ARRAY_SIZE(s->rx[i].data)) {
+ return -1;
+ }
+ }
+
+ if (s->rx_fifo_offset > ARRAY_SIZE(s->rx[0].data) - 4) {
+ return -1;
+ }
+
+ if (s->tx_fifo_len > ARRAY_SIZE(s->tx_fifo)) {
+ return -1;
+ }
+
+ return 0;
+}
+
+static const VMStateDescription vmstate_stellaris_enet = {
+ .name = "stellaris_enet",
+ .version_id = 2,
+ .minimum_version_id = 2,
+ .post_load = stellaris_enet_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(ris, stellaris_enet_state),
+ VMSTATE_UINT32(im, stellaris_enet_state),
+ VMSTATE_UINT32(rctl, stellaris_enet_state),
+ VMSTATE_UINT32(tctl, stellaris_enet_state),
+ VMSTATE_UINT32(thr, stellaris_enet_state),
+ VMSTATE_UINT32(mctl, stellaris_enet_state),
+ VMSTATE_UINT32(mdv, stellaris_enet_state),
+ VMSTATE_UINT32(mtxd, stellaris_enet_state),
+ VMSTATE_UINT32(mrxd, stellaris_enet_state),
+ VMSTATE_UINT32(np, stellaris_enet_state),
+ VMSTATE_UINT32(tx_fifo_len, stellaris_enet_state),
+ VMSTATE_UINT8_ARRAY(tx_fifo, stellaris_enet_state, 2048),
+ VMSTATE_STRUCT_ARRAY(rx, stellaris_enet_state, 31, 1,
+ vmstate_rx_frame, StellarisEnetRxFrame),
+ VMSTATE_UINT32(rx_fifo_offset, stellaris_enet_state),
+ VMSTATE_UINT32(next_packet, stellaris_enet_state),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static void stellaris_enet_update(stellaris_enet_state *s)
{
qemu_set_irq(s->irq, (s->ris & s->im) != 0);
}
+/* Return the data length of the packet currently being assembled
+ * in the TX fifo.
+ */
+static inline int stellaris_txpacket_datalen(stellaris_enet_state *s)
+{
+ return s->tx_fifo[0] | (s->tx_fifo[1] << 8);
+}
+
+/* Return true if the packet currently in the TX FIFO is complete,
+* ie the FIFO holds enough bytes for the data length, ethernet header,
+* payload and optionally CRC.
+*/
+static inline bool stellaris_txpacket_complete(stellaris_enet_state *s)
+{
+ int framelen = stellaris_txpacket_datalen(s);
+ framelen += 16;
+ if (!(s->tctl & SE_TCTL_CRC)) {
+ framelen += 4;
+ }
+ /* Cover the corner case of a 2032 byte payload with auto-CRC disabled:
+ * this requires more bytes than will fit in the FIFO. It's not totally
+ * clear how the h/w handles this, but if using threshold-based TX
+ * it will definitely try to transmit something.
+ */
+ framelen = MIN(framelen, ARRAY_SIZE(s->tx_fifo));
+ return s->tx_fifo_len >= framelen;
+}
+
+/* Return true if the TX FIFO threshold is enabled and the FIFO
+ * has filled enough to reach it.
+ */
+static inline bool stellaris_tx_thr_reached(stellaris_enet_state *s)
+{
+ return (s->thr < 0x3f &&
+ (s->tx_fifo_len >= 4 * (s->thr * 8 + 1)));
+}
+
+/* Send the packet currently in the TX FIFO */
+static void stellaris_enet_send(stellaris_enet_state *s)
+{
+ int framelen = stellaris_txpacket_datalen(s);
+
+ /* Ethernet header is in the FIFO but not in the datacount.
+ * We don't implement explicit CRC, so just ignore any
+ * CRC value in the FIFO.
+ */
+ framelen += 14;
+ if ((s->tctl & SE_TCTL_PADEN) && framelen < 60) {
+ memset(&s->tx_fifo[framelen + 2], 0, 60 - framelen);
+ framelen = 60;
+ }
+ /* This MIN will have no effect unless the FIFO data is corrupt
+ * (eg bad data from an incoming migration); otherwise the check
+ * on the datalen at the start of writing the data into the FIFO
+ * will have caught this. Silently write a corrupt half-packet,
+ * which is what the hardware does in FIFO underrun situations.
+ */
+ framelen = MIN(framelen, ARRAY_SIZE(s->tx_fifo) - 2);
+ qemu_send_packet(qemu_get_queue(s->nic), s->tx_fifo + 2, framelen);
+ s->tx_fifo_len = 0;
+ s->ris |= SE_INT_TXEMP;
+ stellaris_enet_update(s);
+ DPRINTF("Done TX\n");
+}
+
/* TODO: Implement MAC address filtering. */
static ssize_t stellaris_enet_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
if ((s->rctl & SE_RCTL_RXEN) == 0)
return -1;
if (s->np >= 31) {
- DPRINTF("Packet dropped\n");
- return -1;
+ return 0;
}
- DPRINTF("Received packet len=%d\n", size);
+ DPRINTF("Received packet len=%zu\n", size);
n = s->next_packet + s->np;
if (n >= 31)
n -= 31;
- s->np++;
+ if (size >= sizeof(s->rx[n].data) - 6) {
+ /* If the packet won't fit into the
+ * emulated 2K RAM, this is reported
+ * as a FIFO overrun error.
+ */
+ s->ris |= SE_INT_FOV;
+ stellaris_enet_update(s);
+ return -1;
+ }
+
+ s->np++;
s->rx[n].len = size + 6;
p = s->rx[n].data;
*(p++) = (size + 6);
return size;
}
-static int stellaris_enet_can_receive(NetClientState *nc)
+static int stellaris_enet_can_receive(stellaris_enet_state *s)
{
- stellaris_enet_state *s = qemu_get_nic_opaque(nc);
-
- if ((s->rctl & SE_RCTL_RXEN) == 0)
- return 1;
-
return (s->np < 31);
}
case 0x0c: /* TCTL */
return s->tctl;
case 0x10: /* DATA */
- if (s->rx_fifo_len == 0) {
- if (s->np == 0) {
- BADF("RX underflow\n");
- return 0;
- }
- s->rx_fifo_len = s->rx[s->next_packet].len;
- s->rx_fifo = s->rx[s->next_packet].data;
- DPRINTF("RX FIFO start packet len=%d\n", s->rx_fifo_len);
+ {
+ uint8_t *rx_fifo;
+
+ if (s->np == 0) {
+ BADF("RX underflow\n");
+ return 0;
}
- val = s->rx_fifo[0] | (s->rx_fifo[1] << 8) | (s->rx_fifo[2] << 16)
- | (s->rx_fifo[3] << 24);
- s->rx_fifo += 4;
- s->rx_fifo_len -= 4;
- if (s->rx_fifo_len <= 0) {
- s->rx_fifo_len = 0;
+
+ rx_fifo = s->rx[s->next_packet].data + s->rx_fifo_offset;
+
+ val = rx_fifo[0] | (rx_fifo[1] << 8) | (rx_fifo[2] << 16)
+ | (rx_fifo[3] << 24);
+ s->rx_fifo_offset += 4;
+ if (s->rx_fifo_offset >= s->rx[s->next_packet].len) {
+ s->rx_fifo_offset = 0;
s->next_packet++;
if (s->next_packet >= 31)
s->next_packet = 0;
s->np--;
DPRINTF("RX done np=%d\n", s->np);
+ if (!s->np && stellaris_enet_can_receive(s)) {
+ qemu_flush_queued_packets(qemu_get_queue(s->nic));
+ }
}
return val;
+ }
case 0x14: /* IA0 */
return s->conf.macaddr.a[0] | (s->conf.macaddr.a[1] << 8)
- | (s->conf.macaddr.a[2] << 16) | (s->conf.macaddr.a[3] << 24);
+ | (s->conf.macaddr.a[2] << 16)
+ | ((uint32_t)s->conf.macaddr.a[3] << 24);
case 0x18: /* IA1 */
return s->conf.macaddr.a[4] | (s->conf.macaddr.a[5] << 8);
case 0x1c: /* THR */
return s->np;
case 0x38: /* TR */
return 0;
- case 0x3c: /* Undocuented: Timestamp? */
+ case 0x3c: /* Undocumented: Timestamp? */
return 0;
default:
- hw_error("stellaris_enet_read: Bad offset %x\n", (int)offset);
+ qemu_log_mask(LOG_GUEST_ERROR, "stellaris_enet_rd%d: Illegal register"
+ " 0x02%" HWADDR_PRIx "\n",
+ size * 8, offset);
return 0;
}
}
switch (offset) {
case 0x00: /* IACK */
s->ris &= ~value;
- DPRINTF("IRQ ack %02x/%02x\n", value, s->ris);
+ DPRINTF("IRQ ack %02" PRIx64 "/%02x\n", value, s->ris);
stellaris_enet_update(s);
/* Clearing TXER also resets the TX fifo. */
- if (value & SE_INT_TXER)
- s->tx_frame_len = -1;
+ if (value & SE_INT_TXER) {
+ s->tx_fifo_len = 0;
+ }
break;
case 0x04: /* IM */
- DPRINTF("IRQ mask %02x/%02x\n", value, s->ris);
+ DPRINTF("IRQ mask %02" PRIx64 "/%02x\n", value, s->ris);
s->im = value;
stellaris_enet_update(s);
break;
case 0x08: /* RCTL */
s->rctl = value;
if (value & SE_RCTL_RSTFIFO) {
- s->rx_fifo_len = 0;
s->np = 0;
+ s->rx_fifo_offset = 0;
stellaris_enet_update(s);
}
break;
s->tctl = value;
break;
case 0x10: /* DATA */
- if (s->tx_frame_len == -1) {
- s->tx_frame_len = value & 0xffff;
- if (s->tx_frame_len > 2032) {
- DPRINTF("TX frame too long (%d)\n", s->tx_frame_len);
- s->tx_frame_len = 0;
+ if (s->tx_fifo_len == 0) {
+ /* The first word is special, it contains the data length */
+ int framelen = value & 0xffff;
+ if (framelen > 2032) {
+ DPRINTF("TX frame too long (%d)\n", framelen);
s->ris |= SE_INT_TXER;
stellaris_enet_update(s);
- } else {
- DPRINTF("Start TX frame len=%d\n", s->tx_frame_len);
- /* The value written does not include the ethernet header. */
- s->tx_frame_len += 14;
- if ((s->tctl & SE_TCTL_CRC) == 0)
- s->tx_frame_len += 4;
- s->tx_fifo_len = 0;
- s->tx_fifo[s->tx_fifo_len++] = value >> 16;
- s->tx_fifo[s->tx_fifo_len++] = value >> 24;
+ break;
}
- } else {
+ }
+
+ if (s->tx_fifo_len + 4 <= ARRAY_SIZE(s->tx_fifo)) {
s->tx_fifo[s->tx_fifo_len++] = value;
s->tx_fifo[s->tx_fifo_len++] = value >> 8;
s->tx_fifo[s->tx_fifo_len++] = value >> 16;
s->tx_fifo[s->tx_fifo_len++] = value >> 24;
- if (s->tx_fifo_len >= s->tx_frame_len) {
- /* We don't implement explicit CRC, so just chop it off. */
- if ((s->tctl & SE_TCTL_CRC) == 0)
- s->tx_frame_len -= 4;
- if ((s->tctl & SE_TCTL_PADEN) && s->tx_frame_len < 60) {
- memset(&s->tx_fifo[s->tx_frame_len], 0, 60 - s->tx_frame_len);
- s->tx_fifo_len = 60;
- }
- qemu_send_packet(qemu_get_queue(s->nic), s->tx_fifo,
- s->tx_frame_len);
- s->tx_frame_len = -1;
- s->ris |= SE_INT_TXEMP;
- stellaris_enet_update(s);
- DPRINTF("Done TX\n");
- }
+ }
+
+ if (stellaris_tx_thr_reached(s) && stellaris_txpacket_complete(s)) {
+ stellaris_enet_send(s);
}
break;
case 0x14: /* IA0 */
s->thr = value;
break;
case 0x20: /* MCTL */
- s->mctl = value;
+ /* TODO: MII registers aren't modelled.
+ * Clear START, indicating that the operation completes immediately.
+ */
+ s->mctl = value & ~1;
break;
case 0x24: /* MDV */
s->mdv = value;
case 0x2c: /* MTXD */
s->mtxd = value & 0xff;
break;
+ case 0x38: /* TR */
+ if (value & 1) {
+ stellaris_enet_send(s);
+ }
+ break;
case 0x30: /* MRXD */
case 0x34: /* NP */
- case 0x38: /* TR */
/* Ignored. */
case 0x3c: /* Undocuented: Timestamp? */
/* Ignored. */
break;
default:
- hw_error("stellaris_enet_write: Bad offset %x\n", (int)offset);
+ qemu_log_mask(LOG_GUEST_ERROR, "stellaris_enet_wr%d: Illegal register "
+ "0x02%" HWADDR_PRIx " = 0x%" PRIx64 "\n",
+ size * 8, offset, value);
}
}
.endianness = DEVICE_NATIVE_ENDIAN,
};
-static void stellaris_enet_reset(stellaris_enet_state *s)
+static void stellaris_enet_reset(DeviceState *dev)
{
+ stellaris_enet_state *s = STELLARIS_ENET(dev);
+
s->mdv = 0x80;
s->rctl = SE_RCTL_BADCRC;
s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP
| SE_INT_TXER | SE_INT_RX;
s->thr = 0x3f;
- s->tx_frame_len = -1;
-}
-
-static void stellaris_enet_save(QEMUFile *f, void *opaque)
-{
- stellaris_enet_state *s = (stellaris_enet_state *)opaque;
- int i;
-
- qemu_put_be32(f, s->ris);
- qemu_put_be32(f, s->im);
- qemu_put_be32(f, s->rctl);
- qemu_put_be32(f, s->tctl);
- qemu_put_be32(f, s->thr);
- qemu_put_be32(f, s->mctl);
- qemu_put_be32(f, s->mdv);
- qemu_put_be32(f, s->mtxd);
- qemu_put_be32(f, s->mrxd);
- qemu_put_be32(f, s->np);
- qemu_put_be32(f, s->tx_frame_len);
- qemu_put_be32(f, s->tx_fifo_len);
- qemu_put_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
- for (i = 0; i < 31; i++) {
- qemu_put_be32(f, s->rx[i].len);
- qemu_put_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));
-
- }
- qemu_put_be32(f, s->next_packet);
- qemu_put_be32(f, s->rx_fifo - s->rx[s->next_packet].data);
- qemu_put_be32(f, s->rx_fifo_len);
-}
-
-static int stellaris_enet_load(QEMUFile *f, void *opaque, int version_id)
-{
- stellaris_enet_state *s = (stellaris_enet_state *)opaque;
- int i;
-
- if (version_id != 1)
- return -EINVAL;
-
- s->ris = qemu_get_be32(f);
- s->im = qemu_get_be32(f);
- s->rctl = qemu_get_be32(f);
- s->tctl = qemu_get_be32(f);
- s->thr = qemu_get_be32(f);
- s->mctl = qemu_get_be32(f);
- s->mdv = qemu_get_be32(f);
- s->mtxd = qemu_get_be32(f);
- s->mrxd = qemu_get_be32(f);
- s->np = qemu_get_be32(f);
- s->tx_frame_len = qemu_get_be32(f);
- s->tx_fifo_len = qemu_get_be32(f);
- qemu_get_buffer(f, s->tx_fifo, sizeof(s->tx_fifo));
- for (i = 0; i < 31; i++) {
- s->rx[i].len = qemu_get_be32(f);
- qemu_get_buffer(f, s->rx[i].data, sizeof(s->rx[i].data));
-
- }
- s->next_packet = qemu_get_be32(f);
- s->rx_fifo = s->rx[s->next_packet].data + qemu_get_be32(f);
- s->rx_fifo_len = qemu_get_be32(f);
-
- return 0;
-}
-
-static void stellaris_enet_cleanup(NetClientState *nc)
-{
- stellaris_enet_state *s = qemu_get_nic_opaque(nc);
-
- unregister_savevm(&s->busdev.qdev, "stellaris_enet", s);
-
- memory_region_destroy(&s->mmio);
-
- g_free(s);
+ s->tx_fifo_len = 0;
}
static NetClientInfo net_stellaris_enet_info = {
- .type = NET_CLIENT_OPTIONS_KIND_NIC,
+ .type = NET_CLIENT_DRIVER_NIC,
.size = sizeof(NICState),
- .can_receive = stellaris_enet_can_receive,
.receive = stellaris_enet_receive,
- .cleanup = stellaris_enet_cleanup,
};
-static int stellaris_enet_init(SysBusDevice *dev)
+static void stellaris_enet_realize(DeviceState *dev, Error **errp)
{
- stellaris_enet_state *s = FROM_SYSBUS(stellaris_enet_state, dev);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+ stellaris_enet_state *s = STELLARIS_ENET(dev);
memory_region_init_io(&s->mmio, OBJECT(s), &stellaris_enet_ops, s,
"stellaris_enet", 0x1000);
- sysbus_init_mmio(dev, &s->mmio);
- sysbus_init_irq(dev, &s->irq);
+ sysbus_init_mmio(sbd, &s->mmio);
+ sysbus_init_irq(sbd, &s->irq);
qemu_macaddr_default_if_unset(&s->conf.macaddr);
s->nic = qemu_new_nic(&net_stellaris_enet_info, &s->conf,
- object_get_typename(OBJECT(dev)), dev->qdev.id, s);
+ object_get_typename(OBJECT(dev)), dev->id, s);
qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
-
- stellaris_enet_reset(s);
- register_savevm(&s->busdev.qdev, "stellaris_enet", -1, 1,
- stellaris_enet_save, stellaris_enet_load, s);
- return 0;
}
static Property stellaris_enet_properties[] = {
static void stellaris_enet_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
- SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
- k->init = stellaris_enet_init;
+ dc->realize = stellaris_enet_realize;
+ dc->reset = stellaris_enet_reset;
dc->props = stellaris_enet_properties;
+ dc->vmsd = &vmstate_stellaris_enet;
}
static const TypeInfo stellaris_enet_info = {
- .name = "stellaris_enet",
+ .name = TYPE_STELLARIS_ENET,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(stellaris_enet_state),
.class_init = stellaris_enet_class_init,
projects / qemu.git / blobdiff