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qemu/hw/net/xgmac.c
Richard Henderson 1de81b426c hw/net: Constify VMState 
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20231221031652.119827-42-richard.henderson@linaro.org>
2023-12-30 07:38:06 +11:00

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/*
* QEMU model of XGMAC Ethernet.
*
* derived from the Xilinx AXI-Ethernet by Edgar E. Iglesias.
*
* Copyright (c) 2011 Calxeda, Inc.
*
* 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/irq.h"
#include "hw/qdev-properties.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "net/net.h"
#include "qom/object.h"
#ifdef DEBUG_XGMAC
#define DEBUGF_BRK(message, args...) do { \
fprintf(stderr, (message), ## args); \
} while (0)
#else
#define DEBUGF_BRK(message, args...) do { } while (0)
#endif
#define XGMAC_CONTROL 0x00000000 /* MAC Configuration */
#define XGMAC_FRAME_FILTER 0x00000001 /* MAC Frame Filter */
#define XGMAC_FLOW_CTRL 0x00000006 /* MAC Flow Control */
#define XGMAC_VLAN_TAG 0x00000007 /* VLAN Tags */
#define XGMAC_VERSION 0x00000008 /* Version */
/* VLAN tag for insertion or replacement into tx frames */
#define XGMAC_VLAN_INCL 0x00000009
#define XGMAC_LPI_CTRL 0x0000000a /* LPI Control and Status */
#define XGMAC_LPI_TIMER 0x0000000b /* LPI Timers Control */
#define XGMAC_TX_PACE 0x0000000c /* Transmit Pace and Stretch */
#define XGMAC_VLAN_HASH 0x0000000d /* VLAN Hash Table */
#define XGMAC_DEBUG 0x0000000e /* Debug */
#define XGMAC_INT_STATUS 0x0000000f /* Interrupt and Control */
/* HASH table registers */
#define XGMAC_HASH(n) ((0x00000300/4) + (n))
#define XGMAC_NUM_HASH 16
/* Operation Mode */
#define XGMAC_OPMODE (0x00000400/4)
/* Remote Wake-Up Frame Filter */
#define XGMAC_REMOTE_WAKE (0x00000700/4)
/* PMT Control and Status */
#define XGMAC_PMT (0x00000704/4)
#define XGMAC_ADDR_HIGH(reg) (0x00000010+((reg) * 2))
#define XGMAC_ADDR_LOW(reg) (0x00000011+((reg) * 2))
#define DMA_BUS_MODE 0x000003c0 /* Bus Mode */
#define DMA_XMT_POLL_DEMAND 0x000003c1 /* Transmit Poll Demand */
#define DMA_RCV_POLL_DEMAND 0x000003c2 /* Received Poll Demand */
#define DMA_RCV_BASE_ADDR 0x000003c3 /* Receive List Base */
#define DMA_TX_BASE_ADDR 0x000003c4 /* Transmit List Base */
#define DMA_STATUS 0x000003c5 /* Status Register */
#define DMA_CONTROL 0x000003c6 /* Ctrl (Operational Mode) */
#define DMA_INTR_ENA 0x000003c7 /* Interrupt Enable */
#define DMA_MISSED_FRAME_CTR 0x000003c8 /* Missed Frame Counter */
/* Receive Interrupt Watchdog Timer */
#define DMA_RI_WATCHDOG_TIMER 0x000003c9
#define DMA_AXI_BUS 0x000003ca /* AXI Bus Mode */
#define DMA_AXI_STATUS 0x000003cb /* AXI Status */
#define DMA_CUR_TX_DESC_ADDR 0x000003d2 /* Current Host Tx Descriptor */
#define DMA_CUR_RX_DESC_ADDR 0x000003d3 /* Current Host Rx Descriptor */
#define DMA_CUR_TX_BUF_ADDR 0x000003d4 /* Current Host Tx Buffer */
#define DMA_CUR_RX_BUF_ADDR 0x000003d5 /* Current Host Rx Buffer */
#define DMA_HW_FEATURE 0x000003d6 /* Enabled Hardware Features */
/* DMA Status register defines */
#define DMA_STATUS_GMI 0x08000000 /* MMC interrupt */
#define DMA_STATUS_GLI 0x04000000 /* GMAC Line interface int */
#define DMA_STATUS_EB_MASK 0x00380000 /* Error Bits Mask */
#define DMA_STATUS_EB_TX_ABORT 0x00080000 /* Error Bits - TX Abort */
#define DMA_STATUS_EB_RX_ABORT 0x00100000 /* Error Bits - RX Abort */
#define DMA_STATUS_TS_MASK 0x00700000 /* Transmit Process State */
#define DMA_STATUS_TS_SHIFT 20
#define DMA_STATUS_RS_MASK 0x000e0000 /* Receive Process State */
#define DMA_STATUS_RS_SHIFT 17
#define DMA_STATUS_NIS 0x00010000 /* Normal Interrupt Summary */
#define DMA_STATUS_AIS 0x00008000 /* Abnormal Interrupt Summary */
#define DMA_STATUS_ERI 0x00004000 /* Early Receive Interrupt */
#define DMA_STATUS_FBI 0x00002000 /* Fatal Bus Error Interrupt */
#define DMA_STATUS_ETI 0x00000400 /* Early Transmit Interrupt */
#define DMA_STATUS_RWT 0x00000200 /* Receive Watchdog Timeout */
#define DMA_STATUS_RPS 0x00000100 /* Receive Process Stopped */
#define DMA_STATUS_RU 0x00000080 /* Receive Buffer Unavailable */
#define DMA_STATUS_RI 0x00000040 /* Receive Interrupt */
#define DMA_STATUS_UNF 0x00000020 /* Transmit Underflow */
#define DMA_STATUS_OVF 0x00000010 /* Receive Overflow */
#define DMA_STATUS_TJT 0x00000008 /* Transmit Jabber Timeout */
#define DMA_STATUS_TU 0x00000004 /* Transmit Buffer Unavailable */
#define DMA_STATUS_TPS 0x00000002 /* Transmit Process Stopped */
#define DMA_STATUS_TI 0x00000001 /* Transmit Interrupt */
/* DMA Control register defines */
#define DMA_CONTROL_ST 0x00002000 /* Start/Stop Transmission */
#define DMA_CONTROL_SR 0x00000002 /* Start/Stop Receive */
#define DMA_CONTROL_DFF 0x01000000 /* Disable flush of rx frames */
struct desc {
uint32_t ctl_stat;
uint16_t buffer1_size;
uint16_t buffer2_size;
uint32_t buffer1_addr;
uint32_t buffer2_addr;
uint32_t ext_stat;
uint32_t res[3];
};
#define R_MAX 0x400
typedef struct RxTxStats {
uint64_t rx_bytes;
uint64_t tx_bytes;
uint64_t rx;
uint64_t rx_bcast;
uint64_t rx_mcast;
} RxTxStats;
#define TYPE_XGMAC "xgmac"
OBJECT_DECLARE_SIMPLE_TYPE(XgmacState, XGMAC)
struct XgmacState {
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq sbd_irq;
qemu_irq pmt_irq;
qemu_irq mci_irq;
NICState *nic;
NICConf conf;
struct RxTxStats stats;
uint32_t regs[R_MAX];
};
static const VMStateDescription vmstate_rxtx_stats = {
.name = "xgmac_stats",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_UINT64(rx_bytes, RxTxStats),
VMSTATE_UINT64(tx_bytes, RxTxStats),
VMSTATE_UINT64(rx, RxTxStats),
VMSTATE_UINT64(rx_bcast, RxTxStats),
VMSTATE_UINT64(rx_mcast, RxTxStats),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_xgmac = {
.name = "xgmac",
.version_id = 1,
.minimum_version_id = 1,
.fields = (const VMStateField[]) {
VMSTATE_STRUCT(stats, XgmacState, 0, vmstate_rxtx_stats, RxTxStats),
VMSTATE_UINT32_ARRAY(regs, XgmacState, R_MAX),
VMSTATE_END_OF_LIST()
}
};
static void xgmac_read_desc(XgmacState *s, struct desc *d, int rx)
{
uint32_t addr = rx ? s->regs[DMA_CUR_RX_DESC_ADDR] :
s->regs[DMA_CUR_TX_DESC_ADDR];
cpu_physical_memory_read(addr, d, sizeof(*d));
}
static void xgmac_write_desc(XgmacState *s, struct desc *d, int rx)
{
int reg = rx ? DMA_CUR_RX_DESC_ADDR : DMA_CUR_TX_DESC_ADDR;
uint32_t addr = s->regs[reg];
if (!rx && (d->ctl_stat & 0x00200000)) {
s->regs[reg] = s->regs[DMA_TX_BASE_ADDR];
} else if (rx && (d->buffer1_size & 0x8000)) {
s->regs[reg] = s->regs[DMA_RCV_BASE_ADDR];
} else {
s->regs[reg] += sizeof(*d);
}
cpu_physical_memory_write(addr, d, sizeof(*d));
}
static void xgmac_enet_send(XgmacState *s)
{
struct desc bd;
int frame_size;
int len;
uint8_t frame[8192];
uint8_t *ptr;
ptr = frame;
frame_size = 0;
while (1) {
xgmac_read_desc(s, &bd, 0);
if ((bd.ctl_stat & 0x80000000) == 0) {
/* Run out of descriptors to transmit. */
break;
}
len = (bd.buffer1_size & 0xfff) + (bd.buffer2_size & 0xfff);
/*
* FIXME: these cases of malformed tx descriptors (bad sizes)
* should probably be reported back to the guest somehow
* rather than simply silently stopping processing, but we
* don't know what the hardware does in this situation.
* This will only happen for buggy guests anyway.
*/
if ((bd.buffer1_size & 0xfff) > 2048) {
DEBUGF_BRK("qemu:%s:ERROR...ERROR...ERROR... -- "
"xgmac buffer 1 len on send > 2048 (0x%x)\n",
__func__, bd.buffer1_size & 0xfff);
break;
}
if ((bd.buffer2_size & 0xfff) != 0) {
DEBUGF_BRK("qemu:%s:ERROR...ERROR...ERROR... -- "
"xgmac buffer 2 len on send != 0 (0x%x)\n",
__func__, bd.buffer2_size & 0xfff);
break;
}
if (frame_size + len >= sizeof(frame)) {
DEBUGF_BRK("qemu:%s: buffer overflow %d read into %zu "
"buffer\n" , __func__, frame_size + len, sizeof(frame));
DEBUGF_BRK("qemu:%s: buffer1.size=%d; buffer2.size=%d\n",
__func__, bd.buffer1_size, bd.buffer2_size);
break;
}
cpu_physical_memory_read(bd.buffer1_addr, ptr, len);
ptr += len;
frame_size += len;
if (bd.ctl_stat & 0x20000000) {
/* Last buffer in frame. */
qemu_send_packet(qemu_get_queue(s->nic), frame, len);
ptr = frame;
frame_size = 0;
s->regs[DMA_STATUS] |= DMA_STATUS_TI | DMA_STATUS_NIS;
}
bd.ctl_stat &= ~0x80000000;
/* Write back the modified descriptor. */
xgmac_write_desc(s, &bd, 0);
}
}
static void enet_update_irq(XgmacState *s)
{
int stat = s->regs[DMA_STATUS] & s->regs[DMA_INTR_ENA];
qemu_set_irq(s->sbd_irq, !!stat);
}
static uint64_t enet_read(void *opaque, hwaddr addr, unsigned size)
{
XgmacState *s = opaque;
uint64_t r = 0;
addr >>= 2;
switch (addr) {
case XGMAC_VERSION:
r = 0x1012;
break;
default:
if (addr < ARRAY_SIZE(s->regs)) {
r = s->regs[addr];
}
break;
}
return r;
}
static void enet_write(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
XgmacState *s = opaque;
addr >>= 2;
switch (addr) {
case DMA_BUS_MODE:
s->regs[DMA_BUS_MODE] = value & ~0x1;
break;
case DMA_XMT_POLL_DEMAND:
xgmac_enet_send(s);
break;
case DMA_STATUS:
s->regs[DMA_STATUS] = s->regs[DMA_STATUS] & ~value;
break;
case DMA_RCV_BASE_ADDR:
s->regs[DMA_RCV_BASE_ADDR] = s->regs[DMA_CUR_RX_DESC_ADDR] = value;
break;
case DMA_TX_BASE_ADDR:
s->regs[DMA_TX_BASE_ADDR] = s->regs[DMA_CUR_TX_DESC_ADDR] = value;
break;
default:
if (addr < ARRAY_SIZE(s->regs)) {
s->regs[addr] = value;
}
break;
}
enet_update_irq(s);
}
static const MemoryRegionOps enet_mem_ops = {
.read = enet_read,
.write = enet_write,
.endianness = DEVICE_LITTLE_ENDIAN,
};
static int eth_can_rx(XgmacState *s)
{
/* RX enabled? */
return s->regs[DMA_CONTROL] & DMA_CONTROL_SR;
}
static ssize_t eth_rx(NetClientState *nc, const uint8_t *buf, size_t size)
{
XgmacState *s = qemu_get_nic_opaque(nc);
static const unsigned char sa_bcast[6] = {0xff, 0xff, 0xff,
0xff, 0xff, 0xff};
int unicast, broadcast, multicast;
struct desc bd;
ssize_t ret;
if (!eth_can_rx(s)) {
return -1;
}
unicast = ~buf[0] & 0x1;
broadcast = memcmp(buf, sa_bcast, 6) == 0;
multicast = !unicast && !broadcast;
if (size < 12) {
s->regs[DMA_STATUS] |= DMA_STATUS_RI | DMA_STATUS_NIS;
ret = -1;
goto out;
}
xgmac_read_desc(s, &bd, 1);
if ((bd.ctl_stat & 0x80000000) == 0) {
s->regs[DMA_STATUS] |= DMA_STATUS_RU | DMA_STATUS_AIS;
ret = size;
goto out;
}
cpu_physical_memory_write(bd.buffer1_addr, buf, size);
/* Add in the 4 bytes for crc (the real hw returns length incl crc) */
size += 4;
bd.ctl_stat = (size << 16) | 0x300;
xgmac_write_desc(s, &bd, 1);
s->stats.rx_bytes += size;
s->stats.rx++;
if (multicast) {
s->stats.rx_mcast++;
} else if (broadcast) {
s->stats.rx_bcast++;
}
s->regs[DMA_STATUS] |= DMA_STATUS_RI | DMA_STATUS_NIS;
ret = size;
out:
enet_update_irq(s);
return ret;
}
static NetClientInfo net_xgmac_enet_info = {
.type = NET_CLIENT_DRIVER_NIC,
.size = sizeof(NICState),
.receive = eth_rx,
};
static void xgmac_enet_realize(DeviceState *dev, Error **errp)
{
SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
XgmacState *s = XGMAC(dev);
memory_region_init_io(&s->iomem, OBJECT(s), &enet_mem_ops, s,
"xgmac", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->sbd_irq);
sysbus_init_irq(sbd, &s->pmt_irq);
sysbus_init_irq(sbd, &s->mci_irq);
qemu_macaddr_default_if_unset(&s->conf.macaddr);
s->nic = qemu_new_nic(&net_xgmac_enet_info, &s->conf,
object_get_typename(OBJECT(dev)), dev->id,
&dev->mem_reentrancy_guard, s);
qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
s->regs[XGMAC_ADDR_HIGH(0)] = (s->conf.macaddr.a[5] << 8) |
s->conf.macaddr.a[4];
s->regs[XGMAC_ADDR_LOW(0)] = (s->conf.macaddr.a[3] << 24) |
(s->conf.macaddr.a[2] << 16) |
(s->conf.macaddr.a[1] << 8) |
s->conf.macaddr.a[0];
}
static Property xgmac_properties[] = {
DEFINE_NIC_PROPERTIES(XgmacState, conf),
DEFINE_PROP_END_OF_LIST(),
};
static void xgmac_enet_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = xgmac_enet_realize;
dc->vmsd = &vmstate_xgmac;
device_class_set_props(dc, xgmac_properties);
}
static const TypeInfo xgmac_enet_info = {
.name = TYPE_XGMAC,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(XgmacState),
.class_init = xgmac_enet_class_init,
};
static void xgmac_enet_register_types(void)
{
type_register_static(&xgmac_enet_info);
}
type_init(xgmac_enet_register_types)
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