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qemu-e2k/hw/net/fsl_etsec/etsec.c
Fam Zheng 575bafd1f3 etsec: Flush queue when rx buffer is consumed 
The BH will be scheduled when etsec->rx_buffer_len is becoming 0, which
is the condition of queuing.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1436955553-22791-7-git-send-email-famz@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2015-07-27 14:12:18 +01:00

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/*
* QEMU Freescale eTSEC Emulator
*
* Copyright (c) 2011-2013 AdaCore
*
* 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.
*/
/*
* This implementation doesn't include ring priority, TCP/IP Off-Load, QoS.
*/
#include "sysemu/sysemu.h"
#include "hw/sysbus.h"
#include "trace.h"
#include "hw/ptimer.h"
#include "etsec.h"
#include "registers.h"
/* #define HEX_DUMP */
/* #define DEBUG_REGISTER */
#ifdef DEBUG_REGISTER
static const int debug_etsec = 1;
#else
static const int debug_etsec;
#endif
#define DPRINTF(fmt, ...) do { \
if (debug_etsec) { \
qemu_log(fmt , ## __VA_ARGS__); \
} \
} while (0)
static uint64_t etsec_read(void *opaque, hwaddr addr, unsigned size)
{
eTSEC *etsec = opaque;
uint32_t reg_index = addr / 4;
eTSEC_Register *reg = NULL;
uint32_t ret = 0x0;
assert(reg_index < ETSEC_REG_NUMBER);
reg = &etsec->regs[reg_index];
switch (reg->access) {
case ACC_WO:
ret = 0x00000000;
break;
case ACC_RW:
case ACC_W1C:
case ACC_RO:
default:
ret = reg->value;
break;
}
DPRINTF("Read 0x%08x @ 0x" TARGET_FMT_plx
" : %s (%s)\n",
ret, addr, reg->name, reg->desc);
return ret;
}
static void write_tstat(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
int i = 0;
for (i = 0; i < 8; i++) {
/* Check THLTi flag in TSTAT */
if (value & (1 << (31 - i))) {
etsec_walk_tx_ring(etsec, i);
}
}
/* Write 1 to clear */
reg->value &= ~value;
}
static void write_rstat(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
int i = 0;
for (i = 0; i < 8; i++) {
/* Check QHLTi flag in RSTAT */
if (value & (1 << (23 - i)) && !(reg->value & (1 << (23 - i)))) {
etsec_walk_rx_ring(etsec, i);
}
}
/* Write 1 to clear */
reg->value &= ~value;
}
static void write_tbasex(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
reg->value = value & ~0x7;
/* Copy this value in the ring's TxBD pointer */
etsec->regs[TBPTR0 + (reg_index - TBASE0)].value = value & ~0x7;
}
static void write_rbasex(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
reg->value = value & ~0x7;
/* Copy this value in the ring's RxBD pointer */
etsec->regs[RBPTR0 + (reg_index - RBASE0)].value = value & ~0x7;
}
static void write_ievent(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
/* Write 1 to clear */
reg->value &= ~value;
if (!(reg->value & (IEVENT_TXF | IEVENT_TXF))) {
qemu_irq_lower(etsec->tx_irq);
}
if (!(reg->value & (IEVENT_RXF | IEVENT_RXF))) {
qemu_irq_lower(etsec->rx_irq);
}
if (!(reg->value & (IEVENT_MAG | IEVENT_GTSC | IEVENT_GRSC | IEVENT_TXC |
IEVENT_RXC | IEVENT_BABR | IEVENT_BABT | IEVENT_LC |
IEVENT_CRL | IEVENT_FGPI | IEVENT_FIR | IEVENT_FIQ |
IEVENT_DPE | IEVENT_PERR | IEVENT_EBERR | IEVENT_TXE |
IEVENT_XFUN | IEVENT_BSY | IEVENT_MSRO | IEVENT_MMRD |
IEVENT_MMRW))) {
qemu_irq_lower(etsec->err_irq);
}
}
static void write_dmactrl(eTSEC *etsec,
eTSEC_Register *reg,
uint32_t reg_index,
uint32_t value)
{
reg->value = value;
if (value & DMACTRL_GRS) {
if (etsec->rx_buffer_len != 0) {
/* Graceful receive stop delayed until end of frame */
} else {
/* Graceful receive stop now */
etsec->regs[IEVENT].value |= IEVENT_GRSC;
if (etsec->regs[IMASK].value & IMASK_GRSCEN) {
qemu_irq_raise(etsec->err_irq);
}
}
}
if (value & DMACTRL_GTS) {
if (etsec->tx_buffer_len != 0) {
/* Graceful transmit stop delayed until end of frame */
} else {
/* Graceful transmit stop now */
etsec->regs[IEVENT].value |= IEVENT_GTSC;
if (etsec->regs[IMASK].value & IMASK_GTSCEN) {
qemu_irq_raise(etsec->err_irq);
}
}
}
if (!(value & DMACTRL_WOP)) {
/* Start polling */
ptimer_stop(etsec->ptimer);
ptimer_set_count(etsec->ptimer, 1);
ptimer_run(etsec->ptimer, 1);
}
}
static void etsec_write(void *opaque,
hwaddr addr,
uint64_t value,
unsigned size)
{
eTSEC *etsec = opaque;
uint32_t reg_index = addr / 4;
eTSEC_Register *reg = NULL;
uint32_t before = 0x0;
assert(reg_index < ETSEC_REG_NUMBER);
reg = &etsec->regs[reg_index];
before = reg->value;
switch (reg_index) {
case IEVENT:
write_ievent(etsec, reg, reg_index, value);
break;
case DMACTRL:
write_dmactrl(etsec, reg, reg_index, value);
break;
case TSTAT:
write_tstat(etsec, reg, reg_index, value);
break;
case RSTAT:
write_rstat(etsec, reg, reg_index, value);
break;
case TBASE0 ... TBASE7:
write_tbasex(etsec, reg, reg_index, value);
break;
case RBASE0 ... RBASE7:
write_rbasex(etsec, reg, reg_index, value);
break;
case MIIMCFG ... MIIMIND:
etsec_write_miim(etsec, reg, reg_index, value);
break;
default:
/* Default handling */
switch (reg->access) {
case ACC_RW:
case ACC_WO:
reg->value = value;
break;
case ACC_W1C:
reg->value &= ~value;
break;
case ACC_RO:
default:
/* Read Only or Unknown register */
break;
}
}
DPRINTF("Write 0x%08x @ 0x" TARGET_FMT_plx
" val:0x%08x->0x%08x : %s (%s)\n",
(unsigned int)value, addr, before, reg->value,
reg->name, reg->desc);
}
static const MemoryRegionOps etsec_ops = {
.read = etsec_read,
.write = etsec_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.min_access_size = 4,
.max_access_size = 4,
},
};
static void etsec_timer_hit(void *opaque)
{
eTSEC *etsec = opaque;
ptimer_stop(etsec->ptimer);
if (!(etsec->regs[DMACTRL].value & DMACTRL_WOP)) {
if (!(etsec->regs[DMACTRL].value & DMACTRL_GTS)) {
etsec_walk_tx_ring(etsec, 0);
}
ptimer_set_count(etsec->ptimer, 1);
ptimer_run(etsec->ptimer, 1);
}
}
static void etsec_reset(DeviceState *d)
{
eTSEC *etsec = ETSEC_COMMON(d);
int i = 0;
int reg_index = 0;
/* Default value for all registers */
for (i = 0; i < ETSEC_REG_NUMBER; i++) {
etsec->regs[i].name = "Reserved";
etsec->regs[i].desc = "";
etsec->regs[i].access = ACC_UNKNOWN;
etsec->regs[i].value = 0x00000000;
}
/* Set-up known registers */
for (i = 0; eTSEC_registers_def[i].name != NULL; i++) {
reg_index = eTSEC_registers_def[i].offset / 4;
etsec->regs[reg_index].name = eTSEC_registers_def[i].name;
etsec->regs[reg_index].desc = eTSEC_registers_def[i].desc;
etsec->regs[reg_index].access = eTSEC_registers_def[i].access;
etsec->regs[reg_index].value = eTSEC_registers_def[i].reset;
}
etsec->tx_buffer = NULL;
etsec->tx_buffer_len = 0;
etsec->rx_buffer = NULL;
etsec->rx_buffer_len = 0;
etsec->phy_status =
MII_SR_EXTENDED_CAPS | MII_SR_LINK_STATUS | MII_SR_AUTONEG_CAPS |
MII_SR_AUTONEG_COMPLETE | MII_SR_PREAMBLE_SUPPRESS |
MII_SR_EXTENDED_STATUS | MII_SR_100T2_HD_CAPS | MII_SR_100T2_FD_CAPS |
MII_SR_10T_HD_CAPS | MII_SR_10T_FD_CAPS | MII_SR_100X_HD_CAPS |
MII_SR_100X_FD_CAPS | MII_SR_100T4_CAPS;
}
static ssize_t etsec_receive(NetClientState *nc,
const uint8_t *buf,
size_t size)
{
ssize_t ret;
eTSEC *etsec = qemu_get_nic_opaque(nc);
#if defined(HEX_DUMP)
fprintf(stderr, "%s receive size:%d\n", etsec->nic->nc.name, size);
qemu_hexdump(buf, stderr, "", size);
#endif
/* Flush is unnecessary as are already in receiving path */
etsec->need_flush = false;
ret = etsec_rx_ring_write(etsec, buf, size);
if (ret == 0) {
/* The packet will be queued, let's flush it when buffer is avilable
* again. */
etsec->need_flush = true;
}
return ret;
}
static void etsec_set_link_status(NetClientState *nc)
{
eTSEC *etsec = qemu_get_nic_opaque(nc);
etsec_miim_link_status(etsec, nc);
}
static NetClientInfo net_etsec_info = {
.type = NET_CLIENT_OPTIONS_KIND_NIC,
.size = sizeof(NICState),
.receive = etsec_receive,
.link_status_changed = etsec_set_link_status,
};
static void etsec_realize(DeviceState *dev, Error **errp)
{
eTSEC *etsec = ETSEC_COMMON(dev);
etsec->nic = qemu_new_nic(&net_etsec_info, &etsec->conf,
object_get_typename(OBJECT(dev)), dev->id, etsec);
qemu_format_nic_info_str(qemu_get_queue(etsec->nic), etsec->conf.macaddr.a);
etsec->bh = qemu_bh_new(etsec_timer_hit, etsec);
etsec->ptimer = ptimer_init(etsec->bh);
ptimer_set_freq(etsec->ptimer, 100);
}
static void etsec_instance_init(Object *obj)
{
eTSEC *etsec = ETSEC_COMMON(obj);
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
memory_region_init_io(&etsec->io_area, OBJECT(etsec), &etsec_ops, etsec,
"eTSEC", 0x1000);
sysbus_init_mmio(sbd, &etsec->io_area);
sysbus_init_irq(sbd, &etsec->tx_irq);
sysbus_init_irq(sbd, &etsec->rx_irq);
sysbus_init_irq(sbd, &etsec->err_irq);
}
static Property etsec_properties[] = {
DEFINE_NIC_PROPERTIES(eTSEC, conf),
DEFINE_PROP_END_OF_LIST(),
};
static void etsec_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = etsec_realize;
dc->reset = etsec_reset;
dc->props = etsec_properties;
}
static TypeInfo etsec_info = {
.name = "eTSEC",
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(eTSEC),
.class_init = etsec_class_init,
.instance_init = etsec_instance_init,
};
static void etsec_register_types(void)
{
type_register_static(&etsec_info);
}
type_init(etsec_register_types)
DeviceState *etsec_create(hwaddr base,
MemoryRegion * mr,
NICInfo * nd,
qemu_irq tx_irq,
qemu_irq rx_irq,
qemu_irq err_irq)
{
DeviceState *dev;
dev = qdev_create(NULL, "eTSEC");
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, tx_irq);
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1, rx_irq);
sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2, err_irq);
memory_region_add_subregion(mr, base,
SYS_BUS_DEVICE(dev)->mmio[0].memory);
return dev;
}
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