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/*
* Sample server to be tested with samples/client.c
*
* Copyright (c) 2020, Nutanix Inc. All rights reserved.
* Author: Thanos Makatos <thanos@nutanix.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Nutanix nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <err.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include <time.h>
#include <assert.h>
#include <openssl/md5.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/time.h>
#include "../lib/common.h"
#include "../lib/muser.h"
#include "../lib/tran_sock.h"
struct dma_regions {
uint64_t addr;
uint64_t len;
};
#define NR_DMA_REGIONS 96
struct server_data {
lm_ctx_t *lm_ctx;
time_t bar0;
uint8_t *bar1;
struct dma_regions regions[NR_DMA_REGIONS];
struct {
__u64 pending_bytes;
__u64 data_size;
void *migr_data;
size_t migr_data_len;
lm_migr_state_t state;
} migration;
};
static void
_log(UNUSED void *pvt, UNUSED lm_log_lvl_t lvl, char const *msg)
{
fprintf(stderr, "server: %s\n", msg);
}
static int
arm_timer(struct server_data *server_data, time_t t)
{
struct itimerval new = {.it_value.tv_sec = t - time(NULL) };
lm_log(server_data->lm_ctx, LM_DBG,
"arming timer to trigger in %ld seconds", new.it_value.tv_sec);
if (setitimer(ITIMER_REAL, &new, NULL) != 0) {
lm_log(server_data->lm_ctx, LM_ERR, "failed to arm timer: %m");
return -errno;
}
return 0;
}
ssize_t
bar0_access(void *pvt, char * const buf, size_t count, loff_t offset,
const bool is_write)
{
struct server_data *server_data = pvt;
if (count != sizeof(time_t) || offset != 0) {
lm_log(server_data->lm_ctx, LM_ERR, "bad BAR0 access %#lx-%#lx",
offset, offset + count - 1);
errno = EINVAL;
return -1;
}
if (is_write) {
if (server_data->migration.state == LM_MIGR_STATE_RUNNING) {
int ret = arm_timer(server_data, *(time_t*)buf);
if (ret < 0) {
return ret;
}
}
memcpy(&server_data->bar0, buf, count);
} else {
time_t delta = time(NULL) - server_data->bar0;
memcpy(buf, &delta, count);
}
return count;
}
ssize_t
bar1_access(UNUSED void *pvt, UNUSED char * const buf, UNUSED size_t count,
UNUSED loff_t offset, UNUSED const bool is_write)
{
assert(false);
return -ENOTSUP;
}
bool irq_triggered = false;
static void _sa_handler(int signum)
{
int _errno = errno;
if (signum == SIGALRM) {
irq_triggered = true;
}
errno = _errno;
}
static void map_dma(void *pvt, uint64_t iova, uint64_t len)
{
struct server_data *server_data = pvt;
int idx;
for (idx = 0; idx < NR_DMA_REGIONS; idx++) {
if (server_data->regions[idx].addr == 0 &&
server_data->regions[idx].len == 0)
break;
}
if (idx >= NR_DMA_REGIONS) {
errx(EXIT_FAILURE, "Failed to add dma region, slots full\n");
}
server_data->regions[idx].addr = iova;
server_data->regions[idx].len = len;
}
static int unmap_dma(void *pvt, uint64_t iova)
{
struct server_data *server_data = pvt;
int idx;
for (idx = 0; idx < NR_DMA_REGIONS; idx++) {
if (server_data->regions[idx].addr == iova) {
server_data->regions[idx].addr = 0;
server_data->regions[idx].len = 0;
return 0;
}
}
return -EINVAL;
}
void get_md5sum(unsigned char *buf, int len, unsigned char *md5sum)
{
MD5_CTX ctx;
MD5_Init(&ctx);
MD5_Update(&ctx, buf, len);
MD5_Final(md5sum, &ctx);
return;
}
/*
* FIXME this function does DMA write/read using messages. This should be done
* on a region that is not memory mappable or an area of a region that is not
* sparsely memory mappable. We should also have a test where the server does
* DMA directly on the client memory.
*/
static void do_dma_io(lm_ctx_t *lm_ctx, struct server_data *server_data)
{
int count = 4096;
unsigned char buf[count];
unsigned char md5sum1[MD5_DIGEST_LENGTH], md5sum2[MD5_DIGEST_LENGTH];
int i, ret;
dma_sg_t sg;
assert(lm_ctx != NULL);
ret = lm_addr_to_sg(lm_ctx, server_data->regions[0].addr, count, &sg,
1, PROT_WRITE);
if (ret < 0) {
errx(EXIT_FAILURE, "failed to map %#lx-%#lx: %s\n",
server_data->regions[0].addr,
server_data->regions[0].addr + count -1, strerror(-ret));
}
memset(buf, 'A', count);
get_md5sum(buf, count, md5sum1);
printf("%s: WRITE addr %#lx count %d\n", __func__,
server_data->regions[0].addr, count);
ret = lm_dma_write(lm_ctx, &sg, buf);
if (ret < 0) {
errx(EXIT_FAILURE, "lm_dma_write failed: %s\n", strerror(-ret));
}
memset(buf, 0, count);
printf("%s: READ addr %#lx count %d\n", __func__,
server_data->regions[0].addr, count);
ret = lm_dma_read(lm_ctx, &sg, buf);
if (ret < 0) {
errx(EXIT_FAILURE, "lm_dma_read failed: %s\n", strerror(-ret));
}
get_md5sum(buf, count, md5sum2);
for(i = 0; i < MD5_DIGEST_LENGTH; i++) {
if (md5sum2[i] != md5sum1[i]) {
errx(EXIT_FAILURE, "DMA write and DMA read mismatch\n");
}
}
}
unsigned long map_area(UNUSED void *pvt, UNUSED unsigned long off,
UNUSED unsigned long len)
{
assert(false);
return 0;
}
static int device_reset(UNUSED void *pvt)
{
printf("device reset callback\n");
return 0;
}
static int
migration_device_state_transition(void *pvt, lm_migr_state_t state)
{
int ret;
struct server_data *server_data = pvt;
printf("migration: transition to device state %d\n", state);
switch (state) {
case LM_MIGR_STATE_STOP_AND_COPY:
/* TODO must be less than size of data region in migration region */
server_data->migration.pending_bytes = sysconf(_SC_PAGESIZE);
break;
case LM_MIGR_STATE_STOP:
assert(server_data->migration.pending_bytes == 0);
break;
case LM_MIGR_STATE_RESUME:
break;
case LM_MIGR_STATE_RUNNING:
ret = arm_timer(server_data, server_data->bar0);
if (ret < 0) {
return ret;
}
break;
default:
assert(false); /* FIXME */
}
server_data->migration.state = state;
return 0;
}
static __u64
migration_get_pending_bytes(void *pvt)
{
struct server_data *server_data = pvt;
if (server_data->migration.data_size > 0) {
assert(server_data->migration.data_size <= server_data->migration.pending_bytes);
server_data->migration.pending_bytes -= server_data->migration.data_size;
}
return server_data->migration.pending_bytes;
}
static int
migration_prepare_data(void *pvt, __u64 *offset, __u64 *size)
{
struct server_data *server_data = pvt;
*offset = 0;
*size = server_data->migration.data_size = MIN(server_data->migration.pending_bytes, server_data->migration.migr_data_len / 4);
return 0;
}
static size_t
migration_read_data(void *pvt, void *buf, __u64 size, __u64 offset)
{
struct server_data *server_data = pvt;
if (server_data->migration.data_size < size) {
lm_log(server_data->lm_ctx, LM_ERR,
"invalid migration data read %#llx-%#llx",
offset, offset + size - 1);
return -EINVAL;
}
/* FIXME implement, client should be able to write any byte range */
assert((offset == 0 && size >= sizeof server_data->bar0)
|| offset >= sizeof server_data->bar0);
if (offset == 0 && size >= sizeof server_data->bar0) {
memcpy(buf, &server_data->bar0, sizeof server_data->bar0);
}
return size;
}
static size_t
migration_write_data(void *pvt, void *data, __u64 size, __u64 offset)
{
struct server_data *server_data = pvt;
assert(server_data != NULL);
assert(data != NULL);
if (offset + size > server_data->migration.migr_data_len) {
lm_log(server_data->lm_ctx, LM_ERR,
"invalid write %#llx-%#llx", offset, offset + size - 1);
}
memcpy(server_data->migration.migr_data + offset, data, size);
return 0;
}
static int
migration_data_written(void *pvt, __u64 count, __u64 offset)
{
int ret;
struct server_data *server_data = pvt;
assert(server_data != NULL);
if (offset + count > server_data->migration.migr_data_len) {
lm_log(server_data->lm_ctx, LM_ERR,
"bad migration data range %#llx-%#llx",
offset, offset + count - 1);
return -EINVAL;
}
if (offset == 0 && count >= sizeof server_data->bar0) {
/* apply device state */
/* FIXME must arm timer only after device is resumed!!! */
ret = bar0_access(pvt, server_data->migration.migr_data,
sizeof server_data->bar0, 0, true);
if (ret < 0) {
return ret;
}
}
return 0;
}
int main(int argc, char *argv[])
{
int ret;
bool verbose = false;
char opt;
struct sigaction act = {.sa_handler = _sa_handler};
struct server_data server_data = {
.migration = {
/* one page so that we can memory map it */
.migr_data_len = sysconf(_SC_PAGESIZE),
.state = LM_MIGR_STATE_RUNNING
}
};
int nr_sparse_areas = 2, size = 1024, i;
struct lm_sparse_mmap_areas *sparse_areas;
lm_ctx_t *lm_ctx;
while ((opt = getopt(argc, argv, "v")) != -1) {
switch (opt) {
case 'v':
verbose = true;
break;
default: /* '?' */
errx(EXIT_FAILURE, "Usage: %s [-v] <socketpath>\n", argv[0]);
}
}
if (optind >= argc) {
errx(EXIT_FAILURE, "missing MUSER socket path");
}
server_data.bar1 = malloc(sysconf(_SC_PAGESIZE));
if (server_data.bar1 == NULL) {
err(EXIT_FAILURE, "BAR1");
}
sparse_areas = calloc(1, sizeof(*sparse_areas) +
(nr_sparse_areas * sizeof(struct lm_mmap_area)));
if (sparse_areas == NULL) {
err(EXIT_FAILURE, "MMAP sparse areas ENOMEM");
}
sparse_areas->nr_mmap_areas = nr_sparse_areas;
for (i = 0; i < nr_sparse_areas; i++) {
sparse_areas->areas[i].start += size;
sparse_areas->areas[i].size = size;
}
lm_dev_info_t dev_info = {
.trans = LM_TRANS_SOCK,
.log = verbose ? _log : NULL,
.log_lvl = LM_DBG,
.pci_info = {
.id.raw = 0xdeadbeef,
.ss.raw = 0xcafebabe,
.cc = {.pi = 0xab, .scc = 0xcd, .bcc = 0xef},
.reg_info[LM_DEV_BAR0_REG_IDX] = {
.flags = LM_REG_FLAG_RW,
.size = sizeof(time_t),
.fn = &bar0_access
},
.reg_info[LM_DEV_BAR1_REG_IDX] = {
.flags = LM_REG_FLAG_RW,
.size = sysconf(_SC_PAGESIZE),
.fn = &bar1_access,
.mmap_areas = sparse_areas,
.map = map_area
},
.irq_count[LM_DEV_INTX_IRQ_IDX] = 1,
},
.uuid = argv[optind],
.reset = device_reset,
.map_dma = map_dma,
.unmap_dma = unmap_dma,
.pvt = &server_data,
.migration = {
.size = server_data.migration.migr_data_len,
.mmap_areas = sparse_areas,
.callbacks = {
.transition = &migration_device_state_transition,
.get_pending_bytes = &migration_get_pending_bytes,
.prepare_data = &migration_prepare_data,
.read_data = &migration_read_data,
.data_written = &migration_data_written,
.write_data = &migration_write_data
}
}
};
sigemptyset(&act.sa_mask);
if (sigaction(SIGALRM, &act, NULL) == -1) {
err(EXIT_FAILURE, "failed to register signal handler");
}
server_data.lm_ctx = lm_ctx = lm_ctx_create(&dev_info);
if (lm_ctx == NULL) {
err(EXIT_FAILURE, "failed to initialize device emulation\n");
}
server_data.migration.migr_data = aligned_alloc(server_data.migration.migr_data_len,
server_data.migration.migr_data_len);
if (server_data.migration.migr_data == NULL) {
errx(EXIT_FAILURE, "failed to allocate migration data");
}
do {
ret = lm_ctx_drive(lm_ctx);
if (ret == -EINTR) {
if (irq_triggered) {
irq_triggered = false;
lm_irq_trigger(lm_ctx, 0);
ret = lm_irq_message(lm_ctx, 0);
if (ret < 0) {
err(EXIT_FAILURE, "lm_irq_message() failed");
}
do_dma_io(lm_ctx, &server_data);
ret = 0;
}
}
} while (ret == 0);
if (ret != -ENOTCONN && ret != -EINTR && ret != -ESHUTDOWN) {
errx(EXIT_FAILURE, "failed to realize device emulation: %s\n",
strerror(-ret));
}
lm_ctx_destroy(lm_ctx);
free(server_data.bar1);
free(sparse_areas);
return EXIT_SUCCESS;
}
/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
|