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qemu/hw/spapr_llan.c

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/*
* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
*
* PAPR Inter-VM Logical Lan, aka ibmveth
*
* Copyright (c) 2010,2011 David Gibson, IBM Corporation.
*
* 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 "hw/hw.h"
#include "net/net.h"
#include "hw/qdev.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#include <libfdt.h>
#define ETH_ALEN 6
#define MAX_PACKET_SIZE 65536
/*#define DEBUG*/
#ifdef DEBUG
#define dprintf(fmt...) do { fprintf(stderr, fmt); } while (0)
#else
#define dprintf(fmt...)
#endif
/*
* Virtual LAN device
*/
typedef uint64_t vlan_bd_t;
#define VLAN_BD_VALID 0x8000000000000000ULL
#define VLAN_BD_TOGGLE 0x4000000000000000ULL
#define VLAN_BD_NO_CSUM 0x0200000000000000ULL
#define VLAN_BD_CSUM_GOOD 0x0100000000000000ULL
#define VLAN_BD_LEN_MASK 0x00ffffff00000000ULL
#define VLAN_BD_LEN(bd) (((bd) & VLAN_BD_LEN_MASK) >> 32)
#define VLAN_BD_ADDR_MASK 0x00000000ffffffffULL
#define VLAN_BD_ADDR(bd) ((bd) & VLAN_BD_ADDR_MASK)
#define VLAN_VALID_BD(addr, len) (VLAN_BD_VALID | \
(((len) << 32) & VLAN_BD_LEN_MASK) | \
(addr & VLAN_BD_ADDR_MASK))
#define VLAN_RXQC_TOGGLE 0x80
#define VLAN_RXQC_VALID 0x40
#define VLAN_RXQC_NO_CSUM 0x02
#define VLAN_RXQC_CSUM_GOOD 0x01
#define VLAN_RQ_ALIGNMENT 16
#define VLAN_RXQ_BD_OFF 0
#define VLAN_FILTER_BD_OFF 8
#define VLAN_RX_BDS_OFF 16
#define VLAN_MAX_BUFS ((SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF) / 8)
typedef struct VIOsPAPRVLANDevice {
VIOsPAPRDevice sdev;
NICConf nicconf;
NICState *nic;
int isopen;
target_ulong buf_list;
int add_buf_ptr, use_buf_ptr, rx_bufs;
target_ulong rxq_ptr;
} VIOsPAPRVLANDevice;
static int spapr_vlan_can_receive(NetClientState *nc)
{
VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
return (dev->isopen && dev->rx_bufs > 0);
}
static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
size_t size)
{
VIOsPAPRDevice *sdev = qemu_get_nic_opaque(nc);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
vlan_bd_t bd;
int buf_ptr = dev->use_buf_ptr;
uint64_t handle;
uint8_t control;
dprintf("spapr_vlan_receive() [%s] rx_bufs=%d\n", sdev->qdev.id,
dev->rx_bufs);
if (!dev->isopen) {
return -1;
}
if (!dev->rx_bufs) {
return -1;
}
do {
buf_ptr += 8;
if (buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(sdev, dev->buf_list + buf_ptr);
dprintf("use_buf_ptr=%d bd=0x%016llx\n",
buf_ptr, (unsigned long long)bd);
} while ((!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8)))
&& (buf_ptr != dev->use_buf_ptr));
if (!(bd & VLAN_BD_VALID) || (VLAN_BD_LEN(bd) < (size + 8))) {
/* Failed to find a suitable buffer */
return -1;
}
/* Remove the buffer from the pool */
dev->rx_bufs--;
dev->use_buf_ptr = buf_ptr;
vio_stq(sdev, dev->buf_list + dev->use_buf_ptr, 0);
dprintf("Found buffer: ptr=%d num=%d\n", dev->use_buf_ptr, dev->rx_bufs);
/* Transfer the packet data */
if (spapr_vio_dma_write(sdev, VLAN_BD_ADDR(bd) + 8, buf, size) < 0) {
return -1;
}
dprintf("spapr_vlan_receive: DMA write completed\n");
/* Update the receive queue */
control = VLAN_RXQC_TOGGLE | VLAN_RXQC_VALID;
if (rxq_bd & VLAN_BD_TOGGLE) {
control ^= VLAN_RXQC_TOGGLE;
}
handle = vio_ldq(sdev, VLAN_BD_ADDR(bd));
vio_stq(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
vio_stl(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
vio_sth(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
vio_stb(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr, control);
dprintf("wrote rxq entry (ptr=0x%llx): 0x%016llx 0x%016llx\n",
(unsigned long long)dev->rxq_ptr,
(unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
dev->rxq_ptr),
(unsigned long long)vio_ldq(sdev, VLAN_BD_ADDR(rxq_bd) +
dev->rxq_ptr + 8));
dev->rxq_ptr += 16;
if (dev->rxq_ptr >= VLAN_BD_LEN(rxq_bd)) {
dev->rxq_ptr = 0;
vio_stq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
}
if (sdev->signal_state & 1) {
qemu_irq_pulse(spapr_vio_qirq(sdev));
}
return size;
}
static void spapr_vlan_cleanup(NetClientState *nc)
{
VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
dev->nic = NULL;
}
static NetClientInfo net_spapr_vlan_info = {
.type = NET_CLIENT_OPTIONS_KIND_NIC,
.size = sizeof(NICState),
.can_receive = spapr_vlan_can_receive,
.receive = spapr_vlan_receive,
.cleanup = spapr_vlan_cleanup,
};
static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
{
VIOsPAPRVLANDevice *dev = DO_UPCAST(VIOsPAPRVLANDevice, sdev, sdev);
dev->buf_list = 0;
dev->rx_bufs = 0;
dev->isopen = 0;
}
static int spapr_vlan_init(VIOsPAPRDevice *sdev)
{
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
qemu_macaddr_default_if_unset(&dev->nicconf.macaddr);
dev->nic = qemu_new_nic(&net_spapr_vlan_info, &dev->nicconf,
object_get_typename(OBJECT(sdev)), sdev->qdev.id, dev);
qemu_format_nic_info_str(qemu_get_queue(dev->nic), dev->nicconf.macaddr.a);
return 0;
}
void spapr_vlan_create(VIOsPAPRBus *bus, NICInfo *nd)
{
DeviceState *dev;
dev = qdev_create(&bus->bus, "spapr-vlan");
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
}
static int spapr_vlan_devnode(VIOsPAPRDevice *dev, void *fdt, int node_off)
{
VIOsPAPRVLANDevice *vdev = (VIOsPAPRVLANDevice *)dev;
uint8_t padded_mac[8] = {0, 0};
int ret;
/* Some old phyp versions give the mac address in an 8-byte
* property. The kernel driver has an insane workaround for this;
* rather than doing the obvious thing and checking the property
* length, it checks whether the first byte has 0b10 in the low
* bits. If a correct 6-byte property has a different first byte
* the kernel will get the wrong mac address, overrunning its
* buffer in the process (read only, thank goodness).
*
* Here we workaround the kernel workaround by always supplying an
* 8-byte property, with the mac address in the last six bytes */
memcpy(&padded_mac[2], &vdev->nicconf.macaddr, ETH_ALEN);
ret = fdt_setprop(fdt, node_off, "local-mac-address",
padded_mac, sizeof(padded_mac));
if (ret < 0) {
return ret;
}
ret = fdt_setprop_cell(fdt, node_off, "ibm,mac-address-filters", 0);
if (ret < 0) {
return ret;
}
return 0;
}
static int check_bd(VIOsPAPRVLANDevice *dev, vlan_bd_t bd,
target_ulong alignment)
{
if ((VLAN_BD_ADDR(bd) % alignment)
|| (VLAN_BD_LEN(bd) % alignment)) {
return -1;
}
if (!spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
VLAN_BD_LEN(bd), DMA_DIRECTION_FROM_DEVICE)
|| !spapr_vio_dma_valid(&dev->sdev, VLAN_BD_ADDR(bd),
VLAN_BD_LEN(bd), DMA_DIRECTION_TO_DEVICE)) {
return -1;
}
return 0;
}
static target_ulong h_register_logical_lan(PowerPCCPU *cpu,
sPAPREnvironment *spapr,
target_ulong opcode,
target_ulong *args)
{
target_ulong reg = args[0];
target_ulong buf_list = args[1];
target_ulong rec_queue = args[2];
target_ulong filter_list = args[3];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t filter_list_bd;
if (!dev) {
return H_PARAMETER;
}
if (dev->isopen) {
hcall_dprintf("H_REGISTER_LOGICAL_LAN called twice without "
"H_FREE_LOGICAL_LAN\n");
return H_RESOURCE;
}
if (check_bd(dev, VLAN_VALID_BD(buf_list, SPAPR_TCE_PAGE_SIZE),
SPAPR_TCE_PAGE_SIZE) < 0) {
hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx "\n", buf_list);
return H_PARAMETER;
}
filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_TCE_PAGE_SIZE);
if (check_bd(dev, filter_list_bd, SPAPR_TCE_PAGE_SIZE) < 0) {
hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx "\n", filter_list);
return H_PARAMETER;
}
if (!(rec_queue & VLAN_BD_VALID)
|| (check_bd(dev, rec_queue, VLAN_RQ_ALIGNMENT) < 0)) {
hcall_dprintf("Bad receive queue\n");
return H_PARAMETER;
}
dev->buf_list = buf_list;
sdev->signal_state = 0;
rec_queue &= ~VLAN_BD_TOGGLE;
/* Initialize the buffer list */
vio_stq(sdev, buf_list, rec_queue);
vio_stq(sdev, buf_list + 8, filter_list_bd);
spapr_vio_dma_set(sdev, buf_list + VLAN_RX_BDS_OFF, 0,
SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF);
dev->add_buf_ptr = VLAN_RX_BDS_OFF - 8;
dev->use_buf_ptr = VLAN_RX_BDS_OFF - 8;
dev->rx_bufs = 0;
dev->rxq_ptr = 0;
/* Initialize the receive queue */
spapr_vio_dma_set(sdev, VLAN_BD_ADDR(rec_queue), 0, VLAN_BD_LEN(rec_queue));
dev->isopen = 1;
return H_SUCCESS;
}
static target_ulong h_free_logical_lan(PowerPCCPU *cpu, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
if (!dev) {
return H_PARAMETER;
}
if (!dev->isopen) {
hcall_dprintf("H_FREE_LOGICAL_LAN called without "
"H_REGISTER_LOGICAL_LAN\n");
return H_RESOURCE;
}
spapr_vlan_reset(sdev);
return H_SUCCESS;
}
static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
sPAPREnvironment *spapr,
target_ulong opcode,
target_ulong *args)
{
target_ulong reg = args[0];
target_ulong buf = args[1];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t bd;
dprintf("H_ADD_LOGICAL_LAN_BUFFER(0x" TARGET_FMT_lx
", 0x" TARGET_FMT_lx ")\n", reg, buf);
if (!sdev) {
hcall_dprintf("Bad device\n");
return H_PARAMETER;
}
if ((check_bd(dev, buf, 4) < 0)
|| (VLAN_BD_LEN(buf) < 16)) {
hcall_dprintf("Bad buffer enqueued\n");
return H_PARAMETER;
}
if (!dev->isopen || dev->rx_bufs >= VLAN_MAX_BUFS) {
return H_RESOURCE;
}
do {
dev->add_buf_ptr += 8;
if (dev->add_buf_ptr >= SPAPR_TCE_PAGE_SIZE) {
dev->add_buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(sdev, dev->buf_list + dev->add_buf_ptr);
} while (bd & VLAN_BD_VALID);
vio_stq(sdev, dev->buf_list + dev->add_buf_ptr, buf);
dev->rx_bufs++;
dprintf("h_add_logical_lan_buffer(): Added buf ptr=%d rx_bufs=%d"
" bd=0x%016llx\n", dev->add_buf_ptr, dev->rx_bufs,
(unsigned long long)buf);
return H_SUCCESS;
}
static target_ulong h_send_logical_lan(PowerPCCPU *cpu, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
target_ulong *bufs = args + 1;
target_ulong continue_token = args[7];
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
unsigned total_len;
uint8_t *lbuf, *p;
int i, nbufs;
int ret;
dprintf("H_SEND_LOGICAL_LAN(0x" TARGET_FMT_lx ", <bufs>, 0x"
TARGET_FMT_lx ")\n", reg, continue_token);
if (!sdev) {
return H_PARAMETER;
}
dprintf("rxbufs = %d\n", dev->rx_bufs);
if (!dev->isopen) {
return H_DROPPED;
}
if (continue_token) {
return H_HARDWARE; /* FIXME actually handle this */
}
total_len = 0;
for (i = 0; i < 6; i++) {
dprintf(" buf desc: 0x" TARGET_FMT_lx "\n", bufs[i]);
if (!(bufs[i] & VLAN_BD_VALID)) {
break;
}
total_len += VLAN_BD_LEN(bufs[i]);
}
nbufs = i;
dprintf("h_send_logical_lan() %d buffers, total length 0x%x\n",
nbufs, total_len);
if (total_len == 0) {
return H_SUCCESS;
}
if (total_len > MAX_PACKET_SIZE) {
/* Don't let the guest force too large an allocation */
return H_RESOURCE;
}
lbuf = alloca(total_len);
p = lbuf;
for (i = 0; i < nbufs; i++) {
ret = spapr_vio_dma_read(sdev, VLAN_BD_ADDR(bufs[i]),
p, VLAN_BD_LEN(bufs[i]));
if (ret < 0) {
return ret;
}
p += VLAN_BD_LEN(bufs[i]);
}
qemu_send_packet(qemu_get_queue(dev->nic), lbuf, total_len);
return H_SUCCESS;
}
static target_ulong h_multicast_ctrl(PowerPCCPU *cpu, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong reg = args[0];
VIOsPAPRDevice *dev = spapr_vio_find_by_reg(spapr->vio_bus, reg);
if (!dev) {
return H_PARAMETER;
}
return H_SUCCESS;
}
static Property spapr_vlan_properties[] = {
DEFINE_SPAPR_PROPERTIES(VIOsPAPRVLANDevice, sdev),
DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
DEFINE_PROP_END_OF_LIST(),
};
static void spapr_vlan_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
k->init = spapr_vlan_init;
k->reset = spapr_vlan_reset;
k->devnode = spapr_vlan_devnode;
k->dt_name = "l-lan";
k->dt_type = "network";
k->dt_compatible = "IBM,l-lan";
k->signal_mask = 0x1;
dc->props = spapr_vlan_properties;
k->rtce_window_size = 0x10000000;
}
static const TypeInfo spapr_vlan_info = {
.name = "spapr-vlan",
.parent = TYPE_VIO_SPAPR_DEVICE,
.instance_size = sizeof(VIOsPAPRVLANDevice),
.class_init = spapr_vlan_class_init,
};
static void spapr_vlan_register_types(void)
{
spapr_register_hypercall(H_REGISTER_LOGICAL_LAN, h_register_logical_lan);
spapr_register_hypercall(H_FREE_LOGICAL_LAN, h_free_logical_lan);
spapr_register_hypercall(H_SEND_LOGICAL_LAN, h_send_logical_lan);
spapr_register_hypercall(H_ADD_LOGICAL_LAN_BUFFER,
h_add_logical_lan_buffer);
spapr_register_hypercall(H_MULTICAST_CTRL, h_multicast_ctrl);
type_register_static(&spapr_vlan_info);
}
type_init(spapr_vlan_register_types)
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