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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.h"
#include "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_VIO_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(VLANClientState *nc)
{
VIOsPAPRVLANDevice *dev = DO_UPCAST(NICState, nc, nc)->opaque;
return (dev->isopen && dev->rx_bufs > 0);
}
static ssize_t spapr_vlan_receive(VLANClientState *nc, const uint8_t *buf,
size_t size)
{
VIOsPAPRDevice *sdev = DO_UPCAST(NICState, nc, nc)->opaque;
VIOsPAPRVLANDevice *dev = (VIOsPAPRVLANDevice *)sdev;
vlan_bd_t rxq_bd = ldq_tce(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_VIO_TCE_PAGE_SIZE) {
buf_ptr = VLAN_RX_BDS_OFF;
}
bd = ldq_tce(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;
stq_tce(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_tce_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 = ldq_tce(sdev, VLAN_BD_ADDR(bd));
stq_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 8, handle);
stw_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 4, size);
sth_tce(sdev, VLAN_BD_ADDR(rxq_bd) + dev->rxq_ptr + 2, 8);
stb_tce(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)ldq_tce(sdev, VLAN_BD_ADDR(rxq_bd) +
dev->rxq_ptr),
(unsigned long long)ldq_tce(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;
stq_tce(sdev, dev->buf_list + VLAN_RXQ_BD_OFF, rxq_bd ^ VLAN_BD_TOGGLE);
}
if (sdev->signal_state & 1) {
qemu_irq_pulse(sdev->qirq);
}
return size;
}
static NetClientInfo net_spapr_vlan_info = {
.type = NET_CLIENT_TYPE_NIC,
.size = sizeof(NICState),
.can_receive = spapr_vlan_can_receive,
.receive = spapr_vlan_receive,
};
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,
sdev->qdev.info->name, sdev->qdev.id, dev);
qemu_format_nic_info_str(&dev->nic->nc, dev->nicconf.macaddr.a);
return 0;
}
void spapr_vlan_create(VIOsPAPRBus *bus, uint32_t reg, NICInfo *nd,
qemu_irq qirq, uint32_t vio_irq_num)
{
DeviceState *dev;
VIOsPAPRDevice *sdev;
dev = qdev_create(&bus->bus, "spapr-vlan");
qdev_prop_set_uint32(dev, "reg", reg);
qdev_set_nic_properties(dev, nd);
qdev_init_nofail(dev);
sdev = (VIOsPAPRDevice *)dev;
sdev->qirq = qirq;
sdev->vio_irq_num = vio_irq_num;
}
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_check_tces(&dev->sdev, VLAN_BD_ADDR(bd),
VLAN_BD_LEN(bd), SPAPR_TCE_RW) != 0) {
return -1;
}
return 0;
}
static target_ulong h_register_logical_lan(CPUState *env,
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_VIO_TCE_PAGE_SIZE),
SPAPR_VIO_TCE_PAGE_SIZE) < 0) {
hcall_dprintf("Bad buf_list 0x" TARGET_FMT_lx " for "
"H_REGISTER_LOGICAL_LAN\n", buf_list);
return H_PARAMETER;
}
filter_list_bd = VLAN_VALID_BD(filter_list, SPAPR_VIO_TCE_PAGE_SIZE);
if (check_bd(dev, filter_list_bd, SPAPR_VIO_TCE_PAGE_SIZE) < 0) {
hcall_dprintf("Bad filter_list 0x" TARGET_FMT_lx " for "
"H_REGISTER_LOGICAL_LAN\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 for H_REGISTER_LOGICAL_LAN\n");
return H_PARAMETER;
}
dev->buf_list = buf_list;
sdev->signal_state = 0;
rec_queue &= ~VLAN_BD_TOGGLE;
/* Initialize the buffer list */
stq_tce(sdev, buf_list, rec_queue);
stq_tce(sdev, buf_list + 8, filter_list_bd);
spapr_tce_dma_zero(sdev, buf_list + VLAN_RX_BDS_OFF,
SPAPR_VIO_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_tce_dma_zero(sdev, VLAN_BD_ADDR(rec_queue), VLAN_BD_LEN(rec_queue));
dev->isopen = 1;
return H_SUCCESS;
}
static target_ulong h_free_logical_lan(CPUState *env, 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;
}
dev->buf_list = 0;
dev->rx_bufs = 0;
dev->isopen = 0;
return H_SUCCESS;
}
static target_ulong h_add_logical_lan_buffer(CPUState *env,
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("Wrong device in h_add_logical_lan_buffer\n");
return H_PARAMETER;
}
if ((check_bd(dev, buf, 4) < 0)
|| (VLAN_BD_LEN(buf) < 16)) {
hcall_dprintf("Bad buffer enqueued in h_add_logical_lan_buffer\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_VIO_TCE_PAGE_SIZE) {
dev->add_buf_ptr = VLAN_RX_BDS_OFF;
}
bd = ldq_tce(sdev, dev->buf_list + dev->add_buf_ptr);
} while (bd & VLAN_BD_VALID);
stq_tce(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(CPUState *env, 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_tce_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(&dev->nic->nc, lbuf, total_len);
return H_SUCCESS;
}
static target_ulong h_multicast_ctrl(CPUState *env, 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 void vlan_hcalls(VIOsPAPRBus *bus)
{
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);
}
static VIOsPAPRDeviceInfo spapr_vlan = {
.init = spapr_vlan_init,
.devnode = spapr_vlan_devnode,
.dt_name = "l-lan",
.dt_type = "network",
.dt_compatible = "IBM,l-lan",
.signal_mask = 0x1,
.hcalls = vlan_hcalls,
.qdev.name = "spapr-vlan",
.qdev.size = sizeof(VIOsPAPRVLANDevice),
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("reg", VIOsPAPRDevice, reg, 0x1000),
DEFINE_PROP_UINT32("dma-window", VIOsPAPRDevice, rtce_window_size,
0x10000000),
DEFINE_NIC_PROPERTIES(VIOsPAPRVLANDevice, nicconf),
DEFINE_PROP_END_OF_LIST(),
},
};
static void spapr_vlan_register(void)
{
spapr_vio_bus_register_withprop(&spapr_vlan);
}
device_init(spapr_vlan_register);
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