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xemu/hw/net/spapr_llan.c
Thomas Huth 5c29dd8c28 hw/net/spapr_llan: Provide counter with dropped rx frames to the guest 
The last 8 bytes of the receive buffer list page (that has been supplied
by the guest with the H_REGISTER_LOGICAL_LAN call) contain a counter
for frames that have been dropped because there was no suitable receive
buffer available. This patch introduces code to use this field to
provide the information about dropped rx packets to the guest.
There it can be queried with "ethtool -S eth0 | grep rx_no_buffer".

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2016-05-27 09:40:23 +10:00

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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 "qemu/osdep.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/hw.h"
#include "qemu/log.h"
#include "net/net.h"
#include "hw/qdev.h"
#include "hw/ppc/spapr.h"
#include "hw/ppc/spapr_vio.h"
#include "sysemu/sysemu.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
/* Compatibility flags for migration */
#define SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT 0
#define SPAPRVLAN_FLAG_RX_BUF_POOLS (1 << SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT)
/*
* 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
/*
* The final 8 bytes of the buffer list is a counter of frames dropped
* because there was not a buffer in the buffer list capable of holding
* the frame. We must avoid it, or the operating system will report garbage
* for this statistic.
*/
#define VLAN_RX_BDS_LEN (SPAPR_TCE_PAGE_SIZE - VLAN_RX_BDS_OFF - 8)
#define VLAN_MAX_BUFS (VLAN_RX_BDS_LEN / 8)
#define TYPE_VIO_SPAPR_VLAN_DEVICE "spapr-vlan"
#define VIO_SPAPR_VLAN_DEVICE(obj) \
OBJECT_CHECK(VIOsPAPRVLANDevice, (obj), TYPE_VIO_SPAPR_VLAN_DEVICE)
#define RX_POOL_MAX_BDS 4096
#define RX_MAX_POOLS 5
typedef struct {
int32_t bufsize;
int32_t count;
vlan_bd_t bds[RX_POOL_MAX_BDS];
} RxBufPool;
typedef struct VIOsPAPRVLANDevice {
VIOsPAPRDevice sdev;
NICConf nicconf;
NICState *nic;
bool isopen;
hwaddr buf_list;
uint32_t add_buf_ptr, use_buf_ptr, rx_bufs;
hwaddr rxq_ptr;
QEMUTimer *rxp_timer;
uint32_t compat_flags; /* Compatability flags for migration */
RxBufPool *rx_pool[RX_MAX_POOLS]; /* Receive buffer descriptor pools */
} VIOsPAPRVLANDevice;
static int spapr_vlan_can_receive(NetClientState *nc)
{
VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
return (dev->isopen && dev->rx_bufs > 0);
}
/**
* The last 8 bytes of the receive buffer list page (that has been
* supplied by the guest with the H_REGISTER_LOGICAL_LAN call) contain
* a counter for frames that have been dropped because there was no
* suitable receive buffer available. This function is used to increase
* this counter by one.
*/
static void spapr_vlan_record_dropped_rx_frame(VIOsPAPRVLANDevice *dev)
{
uint64_t cnt;
cnt = vio_ldq(&dev->sdev, dev->buf_list + 4096 - 8);
vio_stq(&dev->sdev, dev->buf_list + 4096 - 8, cnt + 1);
}
/**
* Get buffer descriptor from one of our receive buffer pools
*/
static vlan_bd_t spapr_vlan_get_rx_bd_from_pool(VIOsPAPRVLANDevice *dev,
size_t size)
{
vlan_bd_t bd;
int pool;
for (pool = 0; pool < RX_MAX_POOLS; pool++) {
if (dev->rx_pool[pool]->count > 0 &&
dev->rx_pool[pool]->bufsize >= size + 8) {
break;
}
}
if (pool == RX_MAX_POOLS) {
/* Failed to find a suitable buffer */
return 0;
}
DPRINTF("Found buffer: pool=%d count=%d rxbufs=%d\n", pool,
dev->rx_pool[pool]->count, dev->rx_bufs);
/* Remove the buffer from the pool */
dev->rx_pool[pool]->count--;
bd = dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count];
dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count] = 0;
return bd;
}
/**
* Get buffer descriptor from the receive buffer list page that has been
* supplied by the guest with the H_REGISTER_LOGICAL_LAN call
*/
static vlan_bd_t spapr_vlan_get_rx_bd_from_page(VIOsPAPRVLANDevice *dev,
size_t size)
{
int buf_ptr = dev->use_buf_ptr;
vlan_bd_t bd;
do {
buf_ptr += 8;
if (buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(&dev->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 0;
}
/* Remove the buffer from the pool */
dev->use_buf_ptr = buf_ptr;
vio_stq(&dev->sdev, dev->buf_list + dev->use_buf_ptr, 0);
DPRINTF("Found buffer: ptr=%d rxbufs=%d\n", dev->use_buf_ptr, dev->rx_bufs);
return bd;
}
static ssize_t spapr_vlan_receive(NetClientState *nc, const uint8_t *buf,
size_t size)
{
VIOsPAPRVLANDevice *dev = qemu_get_nic_opaque(nc);
VIOsPAPRDevice *sdev = VIO_SPAPR_DEVICE(dev);
vlan_bd_t rxq_bd = vio_ldq(sdev, dev->buf_list + VLAN_RXQ_BD_OFF);
vlan_bd_t bd;
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) {
spapr_vlan_record_dropped_rx_frame(dev);
return 0;
}
if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
bd = spapr_vlan_get_rx_bd_from_pool(dev, size);
} else {
bd = spapr_vlan_get_rx_bd_from_page(dev, size);
}
if (!bd) {
spapr_vlan_record_dropped_rx_frame(dev);
return 0;
}
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 NetClientInfo net_spapr_vlan_info = {
.type = NET_CLIENT_OPTIONS_KIND_NIC,
.size = sizeof(NICState),
.can_receive = spapr_vlan_can_receive,
.receive = spapr_vlan_receive,
};
static void spapr_vlan_flush_rx_queue(void *opaque)
{
VIOsPAPRVLANDevice *dev = opaque;
qemu_flush_queued_packets(qemu_get_queue(dev->nic));
}
static void spapr_vlan_reset_rx_pool(RxBufPool *rxp)
{
/*
* Use INT_MAX as bufsize so that unused buffers are moved to the end
* of the list during the qsort in spapr_vlan_add_rxbuf_to_pool() later.
*/
rxp->bufsize = INT_MAX;
rxp->count = 0;
memset(rxp->bds, 0, sizeof(rxp->bds));
}
static void spapr_vlan_reset(VIOsPAPRDevice *sdev)
{
VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(sdev);
int i;
dev->buf_list = 0;
dev->rx_bufs = 0;
dev->isopen = 0;
if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
for (i = 0; i < RX_MAX_POOLS; i++) {
spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
}
}
}
static void spapr_vlan_realize(VIOsPAPRDevice *sdev, Error **errp)
{
VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(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);
dev->rxp_timer = timer_new_us(QEMU_CLOCK_VIRTUAL, spapr_vlan_flush_rx_queue,
dev);
}
static void spapr_vlan_instance_init(Object *obj)
{
VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj);
int i;
device_add_bootindex_property(obj, &dev->nicconf.bootindex,
"bootindex", "",
DEVICE(dev), NULL);
if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
for (i = 0; i < RX_MAX_POOLS; i++) {
dev->rx_pool[i] = g_new(RxBufPool, 1);
spapr_vlan_reset_rx_pool(dev->rx_pool[i]);
}
}
}
static void spapr_vlan_instance_finalize(Object *obj)
{
VIOsPAPRVLANDevice *dev = VIO_SPAPR_VLAN_DEVICE(obj);
int i;
if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
for (i = 0; i < RX_MAX_POOLS; i++) {
g_free(dev->rx_pool[i]);
dev->rx_pool[i] = NULL;
}
}
if (dev->rxp_timer) {
timer_del(dev->rxp_timer);
timer_free(dev->rxp_timer);
}
}
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 = VIO_SPAPR_VLAN_DEVICE(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,
sPAPRMachineState *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 = VIO_SPAPR_VLAN_DEVICE(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;
qemu_flush_queued_packets(qemu_get_queue(dev->nic));
return H_SUCCESS;
}
static target_ulong h_free_logical_lan(PowerPCCPU *cpu,
sPAPRMachineState *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 = VIO_SPAPR_VLAN_DEVICE(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;
}
/**
* Used for qsort, this function compares two RxBufPools by size.
*/
static int rx_pool_size_compare(const void *p1, const void *p2)
{
const RxBufPool *pool1 = *(RxBufPool **)p1;
const RxBufPool *pool2 = *(RxBufPool **)p2;
if (pool1->bufsize < pool2->bufsize) {
return -1;
}
return pool1->bufsize > pool2->bufsize;
}
/**
* Search for a matching buffer pool with exact matching size,
* or return -1 if no matching pool has been found.
*/
static int spapr_vlan_get_rx_pool_id(VIOsPAPRVLANDevice *dev, int size)
{
int pool;
for (pool = 0; pool < RX_MAX_POOLS; pool++) {
if (dev->rx_pool[pool]->bufsize == size) {
return pool;
}
}
return -1;
}
/**
* Enqueuing receive buffer by adding it to one of our receive buffer pools
*/
static target_long spapr_vlan_add_rxbuf_to_pool(VIOsPAPRVLANDevice *dev,
target_ulong buf)
{
int size = VLAN_BD_LEN(buf);
int pool;
pool = spapr_vlan_get_rx_pool_id(dev, size);
if (pool < 0) {
/*
* No matching pool found? Try to use a new one. If the guest used all
* pools before, but changed the size of one pool inbetween, we might
* need to recycle that pool here (if it's empty already). Thus scan
* all buffer pools now, starting with the last (likely empty) one.
*/
for (pool = RX_MAX_POOLS - 1; pool >= 0 ; pool--) {
if (dev->rx_pool[pool]->count == 0) {
dev->rx_pool[pool]->bufsize = size;
/*
* Sort pools by size so that spapr_vlan_receive()
* can later find the smallest buffer pool easily.
*/
qsort(dev->rx_pool, RX_MAX_POOLS, sizeof(dev->rx_pool[0]),
rx_pool_size_compare);
pool = spapr_vlan_get_rx_pool_id(dev, size);
DPRINTF("created RX pool %d for size %lld\n", pool,
VLAN_BD_LEN(buf));
break;
}
}
}
/* Still no usable pool? Give up */
if (pool < 0 || dev->rx_pool[pool]->count >= RX_POOL_MAX_BDS) {
return H_RESOURCE;
}
DPRINTF("h_add_llan_buf(): Add buf using pool %i (size %lli, count=%i)\n",
pool, VLAN_BD_LEN(buf), dev->rx_pool[pool]->count);
dev->rx_pool[pool]->bds[dev->rx_pool[pool]->count++] = buf;
return 0;
}
/**
* This is the old way of enqueuing receive buffers: Add it to the rx queue
* page that has been supplied by the guest (which is quite limited in size).
*/
static target_long spapr_vlan_add_rxbuf_to_page(VIOsPAPRVLANDevice *dev,
target_ulong buf)
{
vlan_bd_t bd;
if (dev->rx_bufs >= VLAN_MAX_BUFS) {
return H_RESOURCE;
}
do {
dev->add_buf_ptr += 8;
if (dev->add_buf_ptr >= VLAN_RX_BDS_LEN + VLAN_RX_BDS_OFF) {
dev->add_buf_ptr = VLAN_RX_BDS_OFF;
}
bd = vio_ldq(&dev->sdev, dev->buf_list + dev->add_buf_ptr);
} while (bd & VLAN_BD_VALID);
vio_stq(&dev->sdev, dev->buf_list + dev->add_buf_ptr, buf);
DPRINTF("h_add_llan_buf(): Added buf ptr=%d rx_bufs=%d bd=0x%016llx\n",
dev->add_buf_ptr, dev->rx_bufs, (unsigned long long)buf);
return 0;
}
static target_ulong h_add_logical_lan_buffer(PowerPCCPU *cpu,
sPAPRMachineState *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 = VIO_SPAPR_VLAN_DEVICE(sdev);
target_long ret;
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) {
return H_RESOURCE;
}
if (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) {
ret = spapr_vlan_add_rxbuf_to_pool(dev, buf);
} else {
ret = spapr_vlan_add_rxbuf_to_page(dev, buf);
}
if (ret) {
return ret;
}
dev->rx_bufs++;
/*
* Give guest some more time to add additional RX buffers before we
* flush the receive queue, so that e.g. fragmented IP packets can
* be passed to the guest in one go later (instead of passing single
* fragments if there is only one receive buffer available).
*/
timer_mod(dev->rxp_timer, qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 500);
return H_SUCCESS;
}
static target_ulong h_send_logical_lan(PowerPCCPU *cpu,
sPAPRMachineState *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 = VIO_SPAPR_VLAN_DEVICE(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, sPAPRMachineState *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_BIT("use-rx-buffer-pools", VIOsPAPRVLANDevice,
compat_flags, SPAPRVLAN_FLAG_RX_BUF_POOLS_BIT, true),
DEFINE_PROP_END_OF_LIST(),
};
static bool spapr_vlan_rx_buffer_pools_needed(void *opaque)
{
VIOsPAPRVLANDevice *dev = opaque;
return (dev->compat_flags & SPAPRVLAN_FLAG_RX_BUF_POOLS) != 0;
}
static const VMStateDescription vmstate_rx_buffer_pool = {
.name = "spapr_llan/rx_buffer_pool",
.version_id = 1,
.minimum_version_id = 1,
.needed = spapr_vlan_rx_buffer_pools_needed,
.fields = (VMStateField[]) {
VMSTATE_INT32(bufsize, RxBufPool),
VMSTATE_INT32(count, RxBufPool),
VMSTATE_UINT64_ARRAY(bds, RxBufPool, RX_POOL_MAX_BDS),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_rx_pools = {
.name = "spapr_llan/rx_pools",
.version_id = 1,
.minimum_version_id = 1,
.needed = spapr_vlan_rx_buffer_pools_needed,
.fields = (VMStateField[]) {
VMSTATE_ARRAY_OF_POINTER_TO_STRUCT(rx_pool, VIOsPAPRVLANDevice,
RX_MAX_POOLS, 1,
vmstate_rx_buffer_pool, RxBufPool),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_spapr_llan = {
.name = "spapr_llan",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_SPAPR_VIO(sdev, VIOsPAPRVLANDevice),
/* LLAN state */
VMSTATE_BOOL(isopen, VIOsPAPRVLANDevice),
VMSTATE_UINT64(buf_list, VIOsPAPRVLANDevice),
VMSTATE_UINT32(add_buf_ptr, VIOsPAPRVLANDevice),
VMSTATE_UINT32(use_buf_ptr, VIOsPAPRVLANDevice),
VMSTATE_UINT32(rx_bufs, VIOsPAPRVLANDevice),
VMSTATE_UINT64(rxq_ptr, VIOsPAPRVLANDevice),
VMSTATE_END_OF_LIST()
},
.subsections = (const VMStateDescription * []) {
&vmstate_rx_pools,
NULL
}
};
static void spapr_vlan_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VIOsPAPRDeviceClass *k = VIO_SPAPR_DEVICE_CLASS(klass);
k->realize = spapr_vlan_realize;
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;
set_bit(DEVICE_CATEGORY_NETWORK, dc->categories);
dc->props = spapr_vlan_properties;
k->rtce_window_size = 0x10000000;
dc->vmsd = &vmstate_spapr_llan;
}
static const TypeInfo spapr_vlan_info = {
.name = TYPE_VIO_SPAPR_VLAN_DEVICE,
.parent = TYPE_VIO_SPAPR_DEVICE,
.instance_size = sizeof(VIOsPAPRVLANDevice),
.class_init = spapr_vlan_class_init,
.instance_init = spapr_vlan_instance_init,
.instance_finalize = spapr_vlan_instance_finalize,
};
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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