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qemu/hw/net/i82596.c
Peter Maydell 19f7034773 Avoid address_space_rw() with a constant is_write argument 
The address_space_rw() function allows either reads or writes
depending on the is_write argument passed to it; this is useful
when the direction of the access is determined programmatically
(as for instance when handling the KVM_EXIT_MMIO exit reason).
Under the hood it just calls either address_space_write() or
address_space_read_full().

We also use it a lot with a constant is_write argument, though,
which has two issues:
 * when reading "address_space_rw(..., 1)" this is less
   immediately clear to the reader as being a write than
   "address_space_write(...)"
 * calling address_space_rw() bypasses the optimization
   in address_space_read() that fast-paths reads of a
   fixed length

This commit was produced with the included Coccinelle script
scripts/coccinelle/exec_rw_const.cocci.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20200218112457.22712-1-peter.maydell@linaro.org>
[PMD: Update macvm_set_cr0() reported by Laurent Vivier]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2020-02-20 14:47:08 +01:00

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/*
* QEMU Intel i82596 (Apricot) emulation
*
* Copyright (c) 2019 Helge Deller <deller@gmx.de>
* This work is licensed under the GNU GPL license version 2 or later.
*
* This software was written to be compatible with the specification:
* https://www.intel.com/assets/pdf/general/82596ca.pdf
*/
#include "qemu/osdep.h"
#include "qemu/timer.h"
#include "net/net.h"
#include "net/eth.h"
#include "sysemu/sysemu.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "trace.h"
#include "i82596.h"
#include <zlib.h> /* For crc32 */
#if defined(ENABLE_DEBUG)
#define DBG(x) x
#else
#define DBG(x) do { } while (0)
#endif
#define USE_TIMER 0
#define BITS(n, m) (((0xffffffffU << (31 - n)) >> (31 - n + m)) << m)
#define PKT_BUF_SZ 1536
#define MAX_MC_CNT 64
#define ISCP_BUSY 0x0001
#define I596_NULL ((uint32_t)0xffffffff)
#define SCB_STATUS_CX 0x8000 /* CU finished command with I bit */
#define SCB_STATUS_FR 0x4000 /* RU finished receiving a frame */
#define SCB_STATUS_CNA 0x2000 /* CU left active state */
#define SCB_STATUS_RNR 0x1000 /* RU left active state */
#define CU_IDLE 0
#define CU_SUSPENDED 1
#define CU_ACTIVE 2
#define RX_IDLE 0
#define RX_SUSPENDED 1
#define RX_READY 4
#define CMD_EOL 0x8000 /* The last command of the list, stop. */
#define CMD_SUSP 0x4000 /* Suspend after doing cmd. */
#define CMD_INTR 0x2000 /* Interrupt after doing cmd. */
#define CMD_FLEX 0x0008 /* Enable flexible memory model */
enum commands {
CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
};
#define STAT_C 0x8000 /* Set to 0 after execution */
#define STAT_B 0x4000 /* Command being executed */
#define STAT_OK 0x2000 /* Command executed ok */
#define STAT_A 0x1000 /* Command aborted */
#define I596_EOF 0x8000
#define SIZE_MASK 0x3fff
#define ETHER_TYPE_LEN 2
#define VLAN_TCI_LEN 2
#define VLAN_HLEN (ETHER_TYPE_LEN + VLAN_TCI_LEN)
/* various flags in the chip config registers */
#define I596_PREFETCH (s->config[0] & 0x80)
#define I596_PROMISC (s->config[8] & 0x01)
#define I596_BC_DISABLE (s->config[8] & 0x02) /* broadcast disable */
#define I596_NOCRC_INS (s->config[8] & 0x08)
#define I596_CRCINM (s->config[11] & 0x04) /* CRC appended */
#define I596_MC_ALL (s->config[11] & 0x20)
#define I596_MULTIIA (s->config[13] & 0x40)
static uint8_t get_byte(uint32_t addr)
{
return ldub_phys(&address_space_memory, addr);
}
static void set_byte(uint32_t addr, uint8_t c)
{
return stb_phys(&address_space_memory, addr, c);
}
static uint16_t get_uint16(uint32_t addr)
{
return lduw_be_phys(&address_space_memory, addr);
}
static void set_uint16(uint32_t addr, uint16_t w)
{
return stw_be_phys(&address_space_memory, addr, w);
}
static uint32_t get_uint32(uint32_t addr)
{
uint32_t lo = lduw_be_phys(&address_space_memory, addr);
uint32_t hi = lduw_be_phys(&address_space_memory, addr + 2);
return (hi << 16) | lo;
}
static void set_uint32(uint32_t addr, uint32_t val)
{
set_uint16(addr, (uint16_t) val);
set_uint16(addr + 2, val >> 16);
}
struct qemu_ether_header {
uint8_t ether_dhost[6];
uint8_t ether_shost[6];
uint16_t ether_type;
};
#define PRINT_PKTHDR(txt, BUF) do { \
struct qemu_ether_header *hdr = (void *)(BUF); \
printf(txt ": packet dhost=" MAC_FMT ", shost=" MAC_FMT ", type=0x%04x\n",\
MAC_ARG(hdr->ether_dhost), MAC_ARG(hdr->ether_shost), \
be16_to_cpu(hdr->ether_type)); \
} while (0)
static void i82596_transmit(I82596State *s, uint32_t addr)
{
uint32_t tdb_p; /* Transmit Buffer Descriptor */
/* TODO: Check flexible mode */
tdb_p = get_uint32(addr + 8);
while (tdb_p != I596_NULL) {
uint16_t size, len;
uint32_t tba;
size = get_uint16(tdb_p);
len = size & SIZE_MASK;
tba = get_uint32(tdb_p + 8);
trace_i82596_transmit(len, tba);
if (s->nic && len) {
assert(len <= sizeof(s->tx_buffer));
address_space_read(&address_space_memory, tba,
MEMTXATTRS_UNSPECIFIED, s->tx_buffer, len);
DBG(PRINT_PKTHDR("Send", &s->tx_buffer));
DBG(printf("Sending %d bytes\n", len));
qemu_send_packet(qemu_get_queue(s->nic), s->tx_buffer, len);
}
/* was this the last package? */
if (size & I596_EOF) {
break;
}
/* get next buffer pointer */
tdb_p = get_uint32(tdb_p + 4);
}
}
static void set_individual_address(I82596State *s, uint32_t addr)
{
NetClientState *nc;
uint8_t *m;
nc = qemu_get_queue(s->nic);
m = s->conf.macaddr.a;
address_space_read(&address_space_memory, addr + 8,
MEMTXATTRS_UNSPECIFIED, m, ETH_ALEN);
qemu_format_nic_info_str(nc, m);
trace_i82596_new_mac(nc->info_str);
}
static void set_multicast_list(I82596State *s, uint32_t addr)
{
uint16_t mc_count, i;
memset(&s->mult[0], 0, sizeof(s->mult));
mc_count = get_uint16(addr + 8) / ETH_ALEN;
addr += 10;
if (mc_count > MAX_MC_CNT) {
mc_count = MAX_MC_CNT;
}
for (i = 0; i < mc_count; i++) {
uint8_t multicast_addr[ETH_ALEN];
address_space_read(&address_space_memory, addr + i * ETH_ALEN,
MEMTXATTRS_UNSPECIFIED, multicast_addr, ETH_ALEN);
DBG(printf("Add multicast entry " MAC_FMT "\n",
MAC_ARG(multicast_addr)));
unsigned mcast_idx = (net_crc32(multicast_addr, ETH_ALEN) &
BITS(7, 2)) >> 2;
assert(mcast_idx < 8 * sizeof(s->mult));
s->mult[mcast_idx >> 3] |= (1 << (mcast_idx & 7));
}
trace_i82596_set_multicast(mc_count);
}
void i82596_set_link_status(NetClientState *nc)
{
I82596State *d = qemu_get_nic_opaque(nc);
d->lnkst = nc->link_down ? 0 : 0x8000;
}
static void update_scb_status(I82596State *s)
{
s->scb_status = (s->scb_status & 0xf000)
| (s->cu_status << 8) | (s->rx_status << 4);
set_uint16(s->scb, s->scb_status);
}
static void i82596_s_reset(I82596State *s)
{
trace_i82596_s_reset(s);
s->scp = 0;
s->scb_status = 0;
s->cu_status = CU_IDLE;
s->rx_status = RX_SUSPENDED;
s->cmd_p = I596_NULL;
s->lnkst = 0x8000; /* initial link state: up */
s->ca = s->ca_active = 0;
s->send_irq = 0;
}
static void command_loop(I82596State *s)
{
uint16_t cmd;
uint16_t status;
uint8_t byte_cnt;
DBG(printf("STARTING COMMAND LOOP cmd_p=%08x\n", s->cmd_p));
while (s->cmd_p != I596_NULL) {
/* set status */
status = STAT_B;
set_uint16(s->cmd_p, status);
status = STAT_C | STAT_OK; /* update, but write later */
cmd = get_uint16(s->cmd_p + 2);
DBG(printf("Running command %04x at %08x\n", cmd, s->cmd_p));
switch (cmd & 0x07) {
case CmdNOp:
break;
case CmdSASetup:
set_individual_address(s, s->cmd_p);
break;
case CmdConfigure:
byte_cnt = get_byte(s->cmd_p + 8) & 0x0f;
byte_cnt = MAX(byte_cnt, 4);
byte_cnt = MIN(byte_cnt, sizeof(s->config));
/* copy byte_cnt max. */
address_space_read(&address_space_memory, s->cmd_p + 8,
MEMTXATTRS_UNSPECIFIED, s->config, byte_cnt);
/* config byte according to page 35ff */
s->config[2] &= 0x82; /* mask valid bits */
s->config[2] |= 0x40;
s->config[7] &= 0xf7; /* clear zero bit */
assert(I596_NOCRC_INS == 0); /* do CRC insertion */
s->config[10] = MAX(s->config[10], 5); /* min frame length */
s->config[12] &= 0x40; /* only full duplex field valid */
s->config[13] |= 0x3f; /* set ones in byte 13 */
break;
case CmdTDR:
/* get signal LINK */
set_uint32(s->cmd_p + 8, s->lnkst);
break;
case CmdTx:
i82596_transmit(s, s->cmd_p);
break;
case CmdMulticastList:
set_multicast_list(s, s->cmd_p);
break;
case CmdDump:
case CmdDiagnose:
printf("FIXME Command %d !!\n", cmd & 7);
assert(0);
}
/* update status */
set_uint16(s->cmd_p, status);
s->cmd_p = get_uint32(s->cmd_p + 4); /* get link address */
DBG(printf("NEXT addr would be %08x\n", s->cmd_p));
if (s->cmd_p == 0) {
s->cmd_p = I596_NULL;
}
/* Stop when last command of the list. */
if (cmd & CMD_EOL) {
s->cmd_p = I596_NULL;
}
/* Suspend after doing cmd? */
if (cmd & CMD_SUSP) {
s->cu_status = CU_SUSPENDED;
printf("FIXME SUSPEND !!\n");
}
/* Interrupt after doing cmd? */
if (cmd & CMD_INTR) {
s->scb_status |= SCB_STATUS_CX;
} else {
s->scb_status &= ~SCB_STATUS_CX;
}
update_scb_status(s);
/* Interrupt after doing cmd? */
if (cmd & CMD_INTR) {
s->send_irq = 1;
}
if (s->cu_status != CU_ACTIVE) {
break;
}
}
DBG(printf("FINISHED COMMAND LOOP\n"));
qemu_flush_queued_packets(qemu_get_queue(s->nic));
}
static void i82596_flush_queue_timer(void *opaque)
{
I82596State *s = opaque;
if (0) {
timer_del(s->flush_queue_timer);
qemu_flush_queued_packets(qemu_get_queue(s->nic));
timer_mod(s->flush_queue_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 1000);
}
}
static void examine_scb(I82596State *s)
{
uint16_t command, cuc, ruc;
/* get the scb command word */
command = get_uint16(s->scb + 2);
cuc = (command >> 8) & 0x7;
ruc = (command >> 4) & 0x7;
DBG(printf("MAIN COMMAND %04x cuc %02x ruc %02x\n", command, cuc, ruc));
/* and clear the scb command word */
set_uint16(s->scb + 2, 0);
if (command & BIT(31)) /* ACK-CX */
s->scb_status &= ~SCB_STATUS_CX;
if (command & BIT(30)) /*ACK-FR */
s->scb_status &= ~SCB_STATUS_FR;
if (command & BIT(29)) /*ACK-CNA */
s->scb_status &= ~SCB_STATUS_CNA;
if (command & BIT(28)) /*ACK-RNR */
s->scb_status &= ~SCB_STATUS_RNR;
switch (cuc) {
case 0: /* no change */
break;
case 1: /* CUC_START */
s->cu_status = CU_ACTIVE;
break;
case 4: /* CUC_ABORT */
s->cu_status = CU_SUSPENDED;
s->scb_status |= SCB_STATUS_CNA; /* CU left active state */
break;
default:
printf("WARNING: Unknown CUC %d!\n", cuc);
}
switch (ruc) {
case 0: /* no change */
break;
case 1: /* RX_START */
case 2: /* RX_RESUME */
s->rx_status = RX_IDLE;
if (USE_TIMER) {
timer_mod(s->flush_queue_timer, qemu_clock_get_ms(
QEMU_CLOCK_VIRTUAL) + 1000);
}
break;
case 3: /* RX_SUSPEND */
case 4: /* RX_ABORT */
s->rx_status = RX_SUSPENDED;
s->scb_status |= SCB_STATUS_RNR; /* RU left active state */
break;
default:
printf("WARNING: Unknown RUC %d!\n", ruc);
}
if (command & 0x80) { /* reset bit set? */
i82596_s_reset(s);
}
/* execute commands from SCBL */
if (s->cu_status != CU_SUSPENDED) {
if (s->cmd_p == I596_NULL) {
s->cmd_p = get_uint32(s->scb + 4);
}
}
/* update scb status */
update_scb_status(s);
command_loop(s);
}
static void signal_ca(I82596State *s)
{
uint32_t iscp = 0;
/* trace_i82596_channel_attention(s); */
if (s->scp) {
/* CA after reset -> do init with new scp. */
s->sysbus = get_byte(s->scp + 3); /* big endian */
DBG(printf("SYSBUS = %08x\n", s->sysbus));
if (((s->sysbus >> 1) & 0x03) != 2) {
printf("WARNING: NO LINEAR MODE !!\n");
}
if ((s->sysbus >> 7)) {
printf("WARNING: 32BIT LINMODE IN B-STEPPING NOT SUPPORTED !!\n");
}
iscp = get_uint32(s->scp + 8);
s->scb = get_uint32(iscp + 4);
set_byte(iscp + 1, 0); /* clear BUSY flag in iscp */
s->scp = 0;
}
s->ca++; /* count ca() */
if (!s->ca_active) {
s->ca_active = 1;
while (s->ca) {
examine_scb(s);
s->ca--;
}
s->ca_active = 0;
}
if (s->send_irq) {
s->send_irq = 0;
qemu_set_irq(s->irq, 1);
}
}
void i82596_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
{
I82596State *s = opaque;
/* printf("i82596_ioport_writew addr=0x%08x val=0x%04x\n", addr, val); */
switch (addr) {
case PORT_RESET: /* Reset */
i82596_s_reset(s);
break;
case PORT_ALTSCP:
s->scp = val;
break;
case PORT_CA:
signal_ca(s);
break;
}
}
uint32_t i82596_ioport_readw(void *opaque, uint32_t addr)
{
return -1;
}
void i82596_h_reset(void *opaque)
{
I82596State *s = opaque;
i82596_s_reset(s);
}
int i82596_can_receive(NetClientState *nc)
{
I82596State *s = qemu_get_nic_opaque(nc);
if (s->rx_status == RX_SUSPENDED) {
return 0;
}
if (!s->lnkst) {
return 0;
}
if (USE_TIMER && !timer_pending(s->flush_queue_timer)) {
return 1;
}
return 1;
}
#define MIN_BUF_SIZE 60
ssize_t i82596_receive(NetClientState *nc, const uint8_t *buf, size_t sz)
{
I82596State *s = qemu_get_nic_opaque(nc);
uint32_t rfd_p;
uint32_t rbd;
uint16_t is_broadcast = 0;
size_t len = sz;
uint32_t crc;
uint8_t *crc_ptr;
uint8_t buf1[MIN_BUF_SIZE + VLAN_HLEN];
static const uint8_t broadcast_macaddr[6] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
DBG(printf("i82596_receive() start\n"));
if (USE_TIMER && timer_pending(s->flush_queue_timer)) {
return 0;
}
/* first check if receiver is enabled */
if (s->rx_status == RX_SUSPENDED) {
trace_i82596_receive_analysis(">>> Receiving suspended");
return -1;
}
if (!s->lnkst) {
trace_i82596_receive_analysis(">>> Link down");
return -1;
}
/* Received frame smaller than configured "min frame len"? */
if (sz < s->config[10]) {
printf("Received frame too small, %zu vs. %u bytes\n",
sz, s->config[10]);
return -1;
}
DBG(printf("Received %lu bytes\n", sz));
if (I596_PROMISC) {
/* promiscuous: receive all */
trace_i82596_receive_analysis(
">>> packet received in promiscuous mode");
} else {
if (!memcmp(buf, broadcast_macaddr, 6)) {
/* broadcast address */
if (I596_BC_DISABLE) {
trace_i82596_receive_analysis(">>> broadcast packet rejected");
return len;
}
trace_i82596_receive_analysis(">>> broadcast packet received");
is_broadcast = 1;
} else if (buf[0] & 0x01) {
/* multicast */
if (!I596_MC_ALL) {
trace_i82596_receive_analysis(">>> multicast packet rejected");
return len;
}
int mcast_idx = (net_crc32(buf, ETH_ALEN) & BITS(7, 2)) >> 2;
assert(mcast_idx < 8 * sizeof(s->mult));
if (!(s->mult[mcast_idx >> 3] & (1 << (mcast_idx & 7)))) {
trace_i82596_receive_analysis(">>> multicast address mismatch");
return len;
}
trace_i82596_receive_analysis(">>> multicast packet received");
is_broadcast = 1;
} else if (!memcmp(s->conf.macaddr.a, buf, 6)) {
/* match */
trace_i82596_receive_analysis(
">>> physical address matching packet received");
} else {
trace_i82596_receive_analysis(">>> unknown packet");
return len;
}
}
/* if too small buffer, then expand it */
if (len < MIN_BUF_SIZE + VLAN_HLEN) {
memcpy(buf1, buf, len);
memset(buf1 + len, 0, MIN_BUF_SIZE + VLAN_HLEN - len);
buf = buf1;
if (len < MIN_BUF_SIZE) {
len = MIN_BUF_SIZE;
}
}
/* Calculate the ethernet checksum (4 bytes) */
len += 4;
crc = cpu_to_be32(crc32(~0, buf, sz));
crc_ptr = (uint8_t *) &crc;
rfd_p = get_uint32(s->scb + 8); /* get Receive Frame Descriptor */
assert(rfd_p && rfd_p != I596_NULL);
/* get first Receive Buffer Descriptor Address */
rbd = get_uint32(rfd_p + 8);
assert(rbd && rbd != I596_NULL);
trace_i82596_receive_packet(len);
/* PRINT_PKTHDR("Receive", buf); */
while (len) {
uint16_t command, status;
uint32_t next_rfd;
command = get_uint16(rfd_p + 2);
assert(command & CMD_FLEX); /* assert Flex Mode */
/* get first Receive Buffer Descriptor Address */
rbd = get_uint32(rfd_p + 8);
assert(get_uint16(rfd_p + 14) == 0);
/* printf("Receive: rfd is %08x\n", rfd_p); */
while (len) {
uint16_t buffer_size, num;
uint32_t rba;
/* printf("Receive: rbd is %08x\n", rbd); */
buffer_size = get_uint16(rbd + 12);
/* printf("buffer_size is 0x%x\n", buffer_size); */
assert(buffer_size != 0);
num = buffer_size & SIZE_MASK;
if (num > len) {
num = len;
}
rba = get_uint32(rbd + 8);
/* printf("rba is 0x%x\n", rba); */
address_space_write(&address_space_memory, rba,
MEMTXATTRS_UNSPECIFIED, buf, num);
rba += num;
buf += num;
len -= num;
if (len == 0) { /* copy crc */
address_space_write(&address_space_memory, rba - 4,
MEMTXATTRS_UNSPECIFIED, crc_ptr, 4);
}
num |= 0x4000; /* set F BIT */
if (len == 0) {
num |= I596_EOF; /* set EOF BIT */
}
set_uint16(rbd + 0, num); /* write actual count with flags */
/* get next rbd */
rbd = get_uint32(rbd + 4);
/* printf("Next Receive: rbd is %08x\n", rbd); */
if (buffer_size & I596_EOF) /* last entry */
break;
}
/* Housekeeping, see pg. 18 */
next_rfd = get_uint32(rfd_p + 4);
set_uint32(next_rfd + 8, rbd);
status = STAT_C | STAT_OK | is_broadcast;
set_uint16(rfd_p, status);
if (command & CMD_SUSP) { /* suspend after command? */
s->rx_status = RX_SUSPENDED;
s->scb_status |= SCB_STATUS_RNR; /* RU left active state */
break;
}
if (command & CMD_EOL) /* was it last Frame Descriptor? */
break;
assert(len == 0);
}
assert(len == 0);
s->scb_status |= SCB_STATUS_FR; /* set "RU finished receiving frame" bit. */
update_scb_status(s);
/* send IRQ that we received data */
qemu_set_irq(s->irq, 1);
/* s->send_irq = 1; */
if (0) {
DBG(printf("Checking:\n"));
rfd_p = get_uint32(s->scb + 8); /* get Receive Frame Descriptor */
DBG(printf("Next Receive: rfd is %08x\n", rfd_p));
rfd_p = get_uint32(rfd_p + 4); /* get Next Receive Frame Descriptor */
DBG(printf("Next Receive: rfd is %08x\n", rfd_p));
/* get first Receive Buffer Descriptor Address */
rbd = get_uint32(rfd_p + 8);
DBG(printf("Next Receive: rbd is %08x\n", rbd));
}
return sz;
}
const VMStateDescription vmstate_i82596 = {
.name = "i82596",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(lnkst, I82596State),
VMSTATE_TIMER_PTR(flush_queue_timer, I82596State),
VMSTATE_END_OF_LIST()
}
};
void i82596_common_init(DeviceState *dev, I82596State *s, NetClientInfo *info)
{
if (s->conf.macaddr.a[0] == 0) {
qemu_macaddr_default_if_unset(&s->conf.macaddr);
}
s->nic = qemu_new_nic(info, &s->conf, object_get_typename(OBJECT(dev)),
dev->id, s);
qemu_format_nic_info_str(qemu_get_queue(s->nic), s->conf.macaddr.a);
if (USE_TIMER) {
s->flush_queue_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
i82596_flush_queue_timer, s);
}
s->lnkst = 0x8000; /* initial link state: up */
}
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