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linux/Documentation/mic/mpssd/mpssd.c

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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2013 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC User Space Tools.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <fcntl.h>
#include <getopt.h>
#include <assert.h>
#include <unistd.h>
#include <stdbool.h>
#include <signal.h>
#include <poll.h>
#include <features.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <linux/virtio_ring.h>
#include <linux/virtio_net.h>
#include <linux/virtio_console.h>
#include <linux/virtio_blk.h>
#include <linux/version.h>
#include "mpssd.h"
#include <linux/mic_ioctl.h>
#include <linux/mic_common.h>
#include <tools/endian.h>
static void init_mic(struct mic_info *mic);
static FILE *logfp;
static struct mic_info mic_list;
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define min_t(type, x, y) ({ \
type __min1 = (x); \
type __min2 = (y); \
__min1 < __min2 ? __min1 : __min2; })
/* align addr on a size boundary - adjust address up/down if needed */
#define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1)))
#define _ALIGN_UP(addr, size) _ALIGN_DOWN(addr + size - 1, size)
/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr, size) _ALIGN_UP(addr, size)
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
#define GSO_ENABLED 1
#define MAX_GSO_SIZE (64 * 1024)
#define ETH_H_LEN 14
#define MAX_NET_PKT_SIZE (_ALIGN_UP(MAX_GSO_SIZE + ETH_H_LEN, 64))
#define MIC_DEVICE_PAGE_END 0x1000
#ifndef VIRTIO_NET_HDR_F_DATA_VALID
#define VIRTIO_NET_HDR_F_DATA_VALID 2 /* Csum is valid */
#endif
static struct {
struct mic_device_desc dd;
struct mic_vqconfig vqconfig[2];
__u32 host_features, guest_acknowledgements;
struct virtio_console_config cons_config;
} virtcons_dev_page = {
.dd = {
.type = VIRTIO_ID_CONSOLE,
.num_vq = ARRAY_SIZE(virtcons_dev_page.vqconfig),
.feature_len = sizeof(virtcons_dev_page.host_features),
.config_len = sizeof(virtcons_dev_page.cons_config),
},
.vqconfig[0] = {
.num = htole16(MIC_VRING_ENTRIES),
},
.vqconfig[1] = {
.num = htole16(MIC_VRING_ENTRIES),
},
};
static struct {
struct mic_device_desc dd;
struct mic_vqconfig vqconfig[2];
__u32 host_features, guest_acknowledgements;
struct virtio_net_config net_config;
} virtnet_dev_page = {
.dd = {
.type = VIRTIO_ID_NET,
.num_vq = ARRAY_SIZE(virtnet_dev_page.vqconfig),
.feature_len = sizeof(virtnet_dev_page.host_features),
.config_len = sizeof(virtnet_dev_page.net_config),
},
.vqconfig[0] = {
.num = htole16(MIC_VRING_ENTRIES),
},
.vqconfig[1] = {
.num = htole16(MIC_VRING_ENTRIES),
},
#if GSO_ENABLED
.host_features = htole32(
1 << VIRTIO_NET_F_CSUM |
1 << VIRTIO_NET_F_GSO |
1 << VIRTIO_NET_F_GUEST_TSO4 |
1 << VIRTIO_NET_F_GUEST_TSO6 |
1 << VIRTIO_NET_F_GUEST_ECN |
1 << VIRTIO_NET_F_GUEST_UFO),
#else
.host_features = 0,
#endif
};
static const char *mic_config_dir = "/etc/sysconfig/mic";
static const char *virtblk_backend = "VIRTBLK_BACKEND";
static struct {
struct mic_device_desc dd;
struct mic_vqconfig vqconfig[1];
__u32 host_features, guest_acknowledgements;
struct virtio_blk_config blk_config;
} virtblk_dev_page = {
.dd = {
.type = VIRTIO_ID_BLOCK,
.num_vq = ARRAY_SIZE(virtblk_dev_page.vqconfig),
.feature_len = sizeof(virtblk_dev_page.host_features),
.config_len = sizeof(virtblk_dev_page.blk_config),
},
.vqconfig[0] = {
.num = htole16(MIC_VRING_ENTRIES),
},
.host_features =
htole32(1<<VIRTIO_BLK_F_SEG_MAX),
.blk_config = {
.seg_max = htole32(MIC_VRING_ENTRIES - 2),
.capacity = htole64(0),
}
};
static char *myname;
static int
tap_configure(struct mic_info *mic, char *dev)
{
pid_t pid;
char *ifargv[7];
char ipaddr[IFNAMSIZ];
int ret = 0;
pid = fork();
if (pid == 0) {
ifargv[0] = "ip";
ifargv[1] = "link";
ifargv[2] = "set";
ifargv[3] = dev;
ifargv[4] = "up";
ifargv[5] = NULL;
mpsslog("Configuring %s\n", dev);
ret = execvp("ip", ifargv);
if (ret < 0) {
mpsslog("%s execvp failed errno %s\n",
mic->name, strerror(errno));
return ret;
}
}
if (pid < 0) {
mpsslog("%s fork failed errno %s\n",
mic->name, strerror(errno));
return ret;
}
ret = waitpid(pid, NULL, 0);
if (ret < 0) {
mpsslog("%s waitpid failed errno %s\n",
mic->name, strerror(errno));
return ret;
}
snprintf(ipaddr, IFNAMSIZ, "172.31.%d.254/24", mic->id);
pid = fork();
if (pid == 0) {
ifargv[0] = "ip";
ifargv[1] = "addr";
ifargv[2] = "add";
ifargv[3] = ipaddr;
ifargv[4] = "dev";
ifargv[5] = dev;
ifargv[6] = NULL;
mpsslog("Configuring %s ipaddr %s\n", dev, ipaddr);
ret = execvp("ip", ifargv);
if (ret < 0) {
mpsslog("%s execvp failed errno %s\n",
mic->name, strerror(errno));
return ret;
}
}
if (pid < 0) {
mpsslog("%s fork failed errno %s\n",
mic->name, strerror(errno));
return ret;
}
ret = waitpid(pid, NULL, 0);
if (ret < 0) {
mpsslog("%s waitpid failed errno %s\n",
mic->name, strerror(errno));
return ret;
}
mpsslog("MIC name %s %s %d DONE!\n",
mic->name, __func__, __LINE__);
return 0;
}
static int tun_alloc(struct mic_info *mic, char *dev)
{
struct ifreq ifr;
int fd, err;
#if GSO_ENABLED
unsigned offload;
#endif
fd = open("/dev/net/tun", O_RDWR);
if (fd < 0) {
mpsslog("Could not open /dev/net/tun %s\n", strerror(errno));
goto done;
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR;
if (*dev)
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
err = ioctl(fd, TUNSETIFF, (void *)&ifr);
if (err < 0) {
mpsslog("%s %s %d TUNSETIFF failed %s\n",
mic->name, __func__, __LINE__, strerror(errno));
close(fd);
return err;
}
#if GSO_ENABLED
offload = TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
TUN_F_TSO_ECN | TUN_F_UFO;
err = ioctl(fd, TUNSETOFFLOAD, offload);
if (err < 0) {
mpsslog("%s %s %d TUNSETOFFLOAD failed %s\n",
mic->name, __func__, __LINE__, strerror(errno));
close(fd);
return err;
}
#endif
strcpy(dev, ifr.ifr_name);
mpsslog("Created TAP %s\n", dev);
done:
return fd;
}
#define NET_FD_VIRTIO_NET 0
#define NET_FD_TUN 1
#define MAX_NET_FD 2
static void set_dp(struct mic_info *mic, int type, void *dp)
{
switch (type) {
case VIRTIO_ID_CONSOLE:
mic->mic_console.console_dp = dp;
return;
case VIRTIO_ID_NET:
mic->mic_net.net_dp = dp;
return;
case VIRTIO_ID_BLOCK:
mic->mic_virtblk.block_dp = dp;
return;
}
mpsslog("%s %s %d not found\n", mic->name, __func__, type);
assert(0);
}
static void *get_dp(struct mic_info *mic, int type)
{
switch (type) {
case VIRTIO_ID_CONSOLE:
return mic->mic_console.console_dp;
case VIRTIO_ID_NET:
return mic->mic_net.net_dp;
case VIRTIO_ID_BLOCK:
return mic->mic_virtblk.block_dp;
}
mpsslog("%s %s %d not found\n", mic->name, __func__, type);
assert(0);
return NULL;
}
static struct mic_device_desc *get_device_desc(struct mic_info *mic, int type)
{
struct mic_device_desc *d;
int i;
void *dp = get_dp(mic, type);
for (i = sizeof(struct mic_bootparam); i < PAGE_SIZE;
i += mic_total_desc_size(d)) {
d = dp + i;
/* End of list */
if (d->type == 0)
break;
if (d->type == -1)
continue;
mpsslog("%s %s d-> type %d d %p\n",
mic->name, __func__, d->type, d);
if (d->type == (__u8)type)
return d;
}
mpsslog("%s %s %d not found\n", mic->name, __func__, type);
assert(0);
return NULL;
}
/* See comments in vhost.c for explanation of next_desc() */
static unsigned next_desc(struct vring_desc *desc)
{
unsigned int next;
if (!(le16toh(desc->flags) & VRING_DESC_F_NEXT))
return -1U;
next = le16toh(desc->next);
return next;
}
/* Sum up all the IOVEC length */
static ssize_t
sum_iovec_len(struct mic_copy_desc *copy)
{
ssize_t sum = 0;
int i;
for (i = 0; i < copy->iovcnt; i++)
sum += copy->iov[i].iov_len;
return sum;
}
static inline void verify_out_len(struct mic_info *mic,
struct mic_copy_desc *copy)
{
if (copy->out_len != sum_iovec_len(copy)) {
mpsslog("%s %s %d BUG copy->out_len 0x%x len 0x%zx\n",
mic->name, __func__, __LINE__,
copy->out_len, sum_iovec_len(copy));
assert(copy->out_len == sum_iovec_len(copy));
}
}
/* Display an iovec */
static void
disp_iovec(struct mic_info *mic, struct mic_copy_desc *copy,
const char *s, int line)
{
int i;
for (i = 0; i < copy->iovcnt; i++)
mpsslog("%s %s %d copy->iov[%d] addr %p len 0x%zx\n",
mic->name, s, line, i,
copy->iov[i].iov_base, copy->iov[i].iov_len);
}
static inline __u16 read_avail_idx(struct mic_vring *vr)
{
return ACCESS_ONCE(vr->info->avail_idx);
}
static inline void txrx_prepare(int type, bool tx, struct mic_vring *vr,
struct mic_copy_desc *copy, ssize_t len)
{
copy->vr_idx = tx ? 0 : 1;
copy->update_used = true;
if (type == VIRTIO_ID_NET)
copy->iov[1].iov_len = len - sizeof(struct virtio_net_hdr);
else
copy->iov[0].iov_len = len;
}
/* Central API which triggers the copies */
static int
mic_virtio_copy(struct mic_info *mic, int fd,
struct mic_vring *vr, struct mic_copy_desc *copy)
{
int ret;
ret = ioctl(fd, MIC_VIRTIO_COPY_DESC, copy);
if (ret) {
mpsslog("%s %s %d errno %s ret %d\n",
mic->name, __func__, __LINE__,
strerror(errno), ret);
}
return ret;
}
/*
* This initialization routine requires at least one
* vring i.e. vr0. vr1 is optional.
*/
static void *
init_vr(struct mic_info *mic, int fd, int type,
struct mic_vring *vr0, struct mic_vring *vr1, int num_vq)
{
int vr_size;
char *va;
vr_size = PAGE_ALIGN(vring_size(MIC_VRING_ENTRIES,
MIC_VIRTIO_RING_ALIGN) + sizeof(struct _mic_vring_info));
va = mmap(NULL, MIC_DEVICE_PAGE_END + vr_size * num_vq,
PROT_READ, MAP_SHARED, fd, 0);
if (MAP_FAILED == va) {
mpsslog("%s %s %d mmap failed errno %s\n",
mic->name, __func__, __LINE__,
strerror(errno));
goto done;
}
set_dp(mic, type, va);
vr0->va = (struct mic_vring *)&va[MIC_DEVICE_PAGE_END];
vr0->info = vr0->va +
vring_size(MIC_VRING_ENTRIES, MIC_VIRTIO_RING_ALIGN);
vring_init(&vr0->vr,
MIC_VRING_ENTRIES, vr0->va, MIC_VIRTIO_RING_ALIGN);
mpsslog("%s %s vr0 %p vr0->info %p vr_size 0x%x vring 0x%x ",
__func__, mic->name, vr0->va, vr0->info, vr_size,
vring_size(MIC_VRING_ENTRIES, MIC_VIRTIO_RING_ALIGN));
mpsslog("magic 0x%x expected 0x%x\n",
le32toh(vr0->info->magic), MIC_MAGIC + type);
assert(le32toh(vr0->info->magic) == MIC_MAGIC + type);
if (vr1) {
vr1->va = (struct mic_vring *)
&va[MIC_DEVICE_PAGE_END + vr_size];
vr1->info = vr1->va + vring_size(MIC_VRING_ENTRIES,
MIC_VIRTIO_RING_ALIGN);
vring_init(&vr1->vr,
MIC_VRING_ENTRIES, vr1->va, MIC_VIRTIO_RING_ALIGN);
mpsslog("%s %s vr1 %p vr1->info %p vr_size 0x%x vring 0x%x ",
__func__, mic->name, vr1->va, vr1->info, vr_size,
vring_size(MIC_VRING_ENTRIES, MIC_VIRTIO_RING_ALIGN));
mpsslog("magic 0x%x expected 0x%x\n",
le32toh(vr1->info->magic), MIC_MAGIC + type + 1);
assert(le32toh(vr1->info->magic) == MIC_MAGIC + type + 1);
}
done:
return va;
}
static void
wait_for_card_driver(struct mic_info *mic, int fd, int type)
{
struct pollfd pollfd;
int err;
struct mic_device_desc *desc = get_device_desc(mic, type);
pollfd.fd = fd;
mpsslog("%s %s Waiting .... desc-> type %d status 0x%x\n",
mic->name, __func__, type, desc->status);
while (1) {
pollfd.events = POLLIN;
pollfd.revents = 0;
err = poll(&pollfd, 1, -1);
if (err < 0) {
mpsslog("%s %s poll failed %s\n",
mic->name, __func__, strerror(errno));
continue;
}
if (pollfd.revents) {
mpsslog("%s %s Waiting... desc-> type %d status 0x%x\n",
mic->name, __func__, type, desc->status);
if (desc->status & VIRTIO_CONFIG_S_DRIVER_OK) {
mpsslog("%s %s poll.revents %d\n",
mic->name, __func__, pollfd.revents);
mpsslog("%s %s desc-> type %d status 0x%x\n",
mic->name, __func__, type,
desc->status);
break;
}
}
}
}
/* Spin till we have some descriptors */
static void
spin_for_descriptors(struct mic_info *mic, struct mic_vring *vr)
{
__u16 avail_idx = read_avail_idx(vr);
while (avail_idx == le16toh(ACCESS_ONCE(vr->vr.avail->idx))) {
#ifdef DEBUG
mpsslog("%s %s waiting for desc avail %d info_avail %d\n",
mic->name, __func__,
le16toh(vr->vr.avail->idx), vr->info->avail_idx);
#endif
sched_yield();
}
}
static void *
virtio_net(void *arg)
{
static __u8 vnet_hdr[2][sizeof(struct virtio_net_hdr)];
static __u8 vnet_buf[2][MAX_NET_PKT_SIZE] __attribute__ ((aligned(64)));
struct iovec vnet_iov[2][2] = {
{ { .iov_base = vnet_hdr[0], .iov_len = sizeof(vnet_hdr[0]) },
{ .iov_base = vnet_buf[0], .iov_len = sizeof(vnet_buf[0]) } },
{ { .iov_base = vnet_hdr[1], .iov_len = sizeof(vnet_hdr[1]) },
{ .iov_base = vnet_buf[1], .iov_len = sizeof(vnet_buf[1]) } },
};
struct iovec *iov0 = vnet_iov[0], *iov1 = vnet_iov[1];
struct mic_info *mic = (struct mic_info *)arg;
char if_name[IFNAMSIZ];
struct pollfd net_poll[MAX_NET_FD];
struct mic_vring tx_vr, rx_vr;
struct mic_copy_desc copy;
struct mic_device_desc *desc;
int err;
snprintf(if_name, IFNAMSIZ, "mic%d", mic->id);
mic->mic_net.tap_fd = tun_alloc(mic, if_name);
if (mic->mic_net.tap_fd < 0)
goto done;
if (tap_configure(mic, if_name))
goto done;
mpsslog("MIC name %s id %d\n", mic->name, mic->id);
net_poll[NET_FD_VIRTIO_NET].fd = mic->mic_net.virtio_net_fd;
net_poll[NET_FD_VIRTIO_NET].events = POLLIN;
net_poll[NET_FD_TUN].fd = mic->mic_net.tap_fd;
net_poll[NET_FD_TUN].events = POLLIN;
if (MAP_FAILED == init_vr(mic, mic->mic_net.virtio_net_fd,
VIRTIO_ID_NET, &tx_vr, &rx_vr,
virtnet_dev_page.dd.num_vq)) {
mpsslog("%s init_vr failed %s\n",
mic->name, strerror(errno));
goto done;
}
copy.iovcnt = 2;
desc = get_device_desc(mic, VIRTIO_ID_NET);
while (1) {
ssize_t len;
net_poll[NET_FD_VIRTIO_NET].revents = 0;
net_poll[NET_FD_TUN].revents = 0;
/* Start polling for data from tap and virtio net */
err = poll(net_poll, 2, -1);
if (err < 0) {
mpsslog("%s poll failed %s\n",
__func__, strerror(errno));
continue;
}
if (!(desc->status & VIRTIO_CONFIG_S_DRIVER_OK))
wait_for_card_driver(mic, mic->mic_net.virtio_net_fd,
VIRTIO_ID_NET);
/*
* Check if there is data to be read from TUN and write to
* virtio net fd if there is.
*/
if (net_poll[NET_FD_TUN].revents & POLLIN) {
copy.iov = iov0;
len = readv(net_poll[NET_FD_TUN].fd,
copy.iov, copy.iovcnt);
if (len > 0) {
struct virtio_net_hdr *hdr
= (struct virtio_net_hdr *)vnet_hdr[0];
/* Disable checksums on the card since we are on
a reliable PCIe link */
hdr->flags |= VIRTIO_NET_HDR_F_DATA_VALID;
#ifdef DEBUG
mpsslog("%s %s %d hdr->flags 0x%x ", mic->name,
__func__, __LINE__, hdr->flags);
mpsslog("copy.out_len %d hdr->gso_type 0x%x\n",
copy.out_len, hdr->gso_type);
#endif
#ifdef DEBUG
disp_iovec(mic, copy, __func__, __LINE__);
mpsslog("%s %s %d read from tap 0x%lx\n",
mic->name, __func__, __LINE__,
len);
#endif
spin_for_descriptors(mic, &tx_vr);
txrx_prepare(VIRTIO_ID_NET, 1, &tx_vr, &copy,
len);
err = mic_virtio_copy(mic,
mic->mic_net.virtio_net_fd, &tx_vr,
&copy);
if (err < 0) {
mpsslog("%s %s %d mic_virtio_copy %s\n",
mic->name, __func__, __LINE__,
strerror(errno));
}
if (!err)
verify_out_len(mic, &copy);
#ifdef DEBUG
disp_iovec(mic, copy, __func__, __LINE__);
mpsslog("%s %s %d wrote to net 0x%lx\n",
mic->name, __func__, __LINE__,
sum_iovec_len(&copy));
#endif
/* Reinitialize IOV for next run */
iov0[1].iov_len = MAX_NET_PKT_SIZE;
} else if (len < 0) {
disp_iovec(mic, &copy, __func__, __LINE__);
mpsslog("%s %s %d read failed %s ", mic->name,
__func__, __LINE__, strerror(errno));
mpsslog("cnt %d sum %zd\n",
copy.iovcnt, sum_iovec_len(&copy));
}
}
/*
* Check if there is data to be read from virtio net and
* write to TUN if there is.
*/
if (net_poll[NET_FD_VIRTIO_NET].revents & POLLIN) {
while (rx_vr.info->avail_idx !=
le16toh(rx_vr.vr.avail->idx)) {
copy.iov = iov1;
txrx_prepare(VIRTIO_ID_NET, 0, &rx_vr, &copy,
MAX_NET_PKT_SIZE
+ sizeof(struct virtio_net_hdr));
err = mic_virtio_copy(mic,
mic->mic_net.virtio_net_fd, &rx_vr,
&copy);
if (!err) {
#ifdef DEBUG
struct virtio_net_hdr *hdr
= (struct virtio_net_hdr *)
vnet_hdr[1];
mpsslog("%s %s %d hdr->flags 0x%x, ",
mic->name, __func__, __LINE__,
hdr->flags);
mpsslog("out_len %d gso_type 0x%x\n",
copy.out_len,
hdr->gso_type);
#endif
/* Set the correct output iov_len */
iov1[1].iov_len = copy.out_len -
sizeof(struct virtio_net_hdr);
verify_out_len(mic, &copy);
#ifdef DEBUG
disp_iovec(mic, copy, __func__,
__LINE__);
mpsslog("%s %s %d ",
mic->name, __func__, __LINE__);
mpsslog("read from net 0x%lx\n",
sum_iovec_len(copy));
#endif
len = writev(net_poll[NET_FD_TUN].fd,
copy.iov, copy.iovcnt);
if (len != sum_iovec_len(&copy)) {
mpsslog("Tun write failed %s ",
strerror(errno));
mpsslog("len 0x%zx ", len);
mpsslog("read_len 0x%zx\n",
sum_iovec_len(&copy));
} else {
#ifdef DEBUG
disp_iovec(mic, &copy, __func__,
__LINE__);
mpsslog("%s %s %d ",
mic->name, __func__,
__LINE__);
mpsslog("wrote to tap 0x%lx\n",
len);
#endif
}
} else {
mpsslog("%s %s %d mic_virtio_copy %s\n",
mic->name, __func__, __LINE__,
strerror(errno));
break;
}
}
}
if (net_poll[NET_FD_VIRTIO_NET].revents & POLLERR)
mpsslog("%s: %s: POLLERR\n", __func__, mic->name);
}
done:
pthread_exit(NULL);
}
/* virtio_console */
#define VIRTIO_CONSOLE_FD 0
#define MONITOR_FD (VIRTIO_CONSOLE_FD + 1)
#define MAX_CONSOLE_FD (MONITOR_FD + 1) /* must be the last one + 1 */
#define MAX_BUFFER_SIZE PAGE_SIZE
static void *
virtio_console(void *arg)
{
static __u8 vcons_buf[2][PAGE_SIZE];
struct iovec vcons_iov[2] = {
{ .iov_base = vcons_buf[0], .iov_len = sizeof(vcons_buf[0]) },
{ .iov_base = vcons_buf[1], .iov_len = sizeof(vcons_buf[1]) },
};
struct iovec *iov0 = &vcons_iov[0], *iov1 = &vcons_iov[1];
struct mic_info *mic = (struct mic_info *)arg;
int err;
struct pollfd console_poll[MAX_CONSOLE_FD];
int pty_fd;
char *pts_name;
ssize_t len;
struct mic_vring tx_vr, rx_vr;
struct mic_copy_desc copy;
struct mic_device_desc *desc;
pty_fd = posix_openpt(O_RDWR);
if (pty_fd < 0) {
mpsslog("can't open a pseudoterminal master device: %s\n",
strerror(errno));
goto _return;
}
pts_name = ptsname(pty_fd);
if (pts_name == NULL) {
mpsslog("can't get pts name\n");
goto _close_pty;
}
printf("%s console message goes to %s\n", mic->name, pts_name);
mpsslog("%s console message goes to %s\n", mic->name, pts_name);
err = grantpt(pty_fd);
if (err < 0) {
mpsslog("can't grant access: %s %s\n",
pts_name, strerror(errno));
goto _close_pty;
}
err = unlockpt(pty_fd);
if (err < 0) {
mpsslog("can't unlock a pseudoterminal: %s %s\n",
pts_name, strerror(errno));
goto _close_pty;
}
console_poll[MONITOR_FD].fd = pty_fd;
console_poll[MONITOR_FD].events = POLLIN;
console_poll[VIRTIO_CONSOLE_FD].fd = mic->mic_console.virtio_console_fd;
console_poll[VIRTIO_CONSOLE_FD].events = POLLIN;
if (MAP_FAILED == init_vr(mic, mic->mic_console.virtio_console_fd,
VIRTIO_ID_CONSOLE, &tx_vr, &rx_vr,
virtcons_dev_page.dd.num_vq)) {
mpsslog("%s init_vr failed %s\n",
mic->name, strerror(errno));
goto _close_pty;
}
copy.iovcnt = 1;
desc = get_device_desc(mic, VIRTIO_ID_CONSOLE);
for (;;) {
console_poll[MONITOR_FD].revents = 0;
console_poll[VIRTIO_CONSOLE_FD].revents = 0;
err = poll(console_poll, MAX_CONSOLE_FD, -1);
if (err < 0) {
mpsslog("%s %d: poll failed: %s\n", __func__, __LINE__,
strerror(errno));
continue;
}
if (!(desc->status & VIRTIO_CONFIG_S_DRIVER_OK))
wait_for_card_driver(mic,
mic->mic_console.virtio_console_fd,
VIRTIO_ID_CONSOLE);
if (console_poll[MONITOR_FD].revents & POLLIN) {
copy.iov = iov0;
len = readv(pty_fd, copy.iov, copy.iovcnt);
if (len > 0) {
#ifdef DEBUG
disp_iovec(mic, copy, __func__, __LINE__);
mpsslog("%s %s %d read from tap 0x%lx\n",
mic->name, __func__, __LINE__,
len);
#endif
spin_for_descriptors(mic, &tx_vr);
txrx_prepare(VIRTIO_ID_CONSOLE, 1, &tx_vr,
&copy, len);
err = mic_virtio_copy(mic,
mic->mic_console.virtio_console_fd,
&tx_vr, &copy);
if (err < 0) {
mpsslog("%s %s %d mic_virtio_copy %s\n",
mic->name, __func__, __LINE__,
strerror(errno));
}
if (!err)
verify_out_len(mic, &copy);
#ifdef DEBUG
disp_iovec(mic, copy, __func__, __LINE__);
mpsslog("%s %s %d wrote to net 0x%lx\n",
mic->name, __func__, __LINE__,
sum_iovec_len(copy));
#endif
/* Reinitialize IOV for next run */
iov0->iov_len = PAGE_SIZE;
} else if (len < 0) {
disp_iovec(mic, &copy, __func__, __LINE__);
mpsslog("%s %s %d read failed %s ",
mic->name, __func__, __LINE__,
strerror(errno));
mpsslog("cnt %d sum %zd\n",
copy.iovcnt, sum_iovec_len(&copy));
}
}
if (console_poll[VIRTIO_CONSOLE_FD].revents & POLLIN) {
while (rx_vr.info->avail_idx !=
le16toh(rx_vr.vr.avail->idx)) {
copy.iov = iov1;
txrx_prepare(VIRTIO_ID_CONSOLE, 0, &rx_vr,
&copy, PAGE_SIZE);
err = mic_virtio_copy(mic,
mic->mic_console.virtio_console_fd,
&rx_vr, &copy);
if (!err) {
/* Set the correct output iov_len */
iov1->iov_len = copy.out_len;
verify_out_len(mic, &copy);
#ifdef DEBUG
disp_iovec(mic, copy, __func__,
__LINE__);
mpsslog("%s %s %d ",
mic->name, __func__, __LINE__);
mpsslog("read from net 0x%lx\n",
sum_iovec_len(copy));
#endif
len = writev(pty_fd,
copy.iov, copy.iovcnt);
if (len != sum_iovec_len(&copy)) {
mpsslog("Tun write failed %s ",
strerror(errno));
mpsslog("len 0x%zx ", len);
mpsslog("read_len 0x%zx\n",
sum_iovec_len(&copy));
} else {
#ifdef DEBUG
disp_iovec(mic, copy, __func__,
__LINE__);
mpsslog("%s %s %d ",
mic->name, __func__,
__LINE__);
mpsslog("wrote to tap 0x%lx\n",
len);
#endif
}
} else {
mpsslog("%s %s %d mic_virtio_copy %s\n",
mic->name, __func__, __LINE__,
strerror(errno));
break;
}
}
}
if (console_poll[NET_FD_VIRTIO_NET].revents & POLLERR)
mpsslog("%s: %s: POLLERR\n", __func__, mic->name);
}
_close_pty:
close(pty_fd);
_return:
pthread_exit(NULL);
}
static void
add_virtio_device(struct mic_info *mic, struct mic_device_desc *dd)
{
char path[PATH_MAX];
int fd, err;
snprintf(path, PATH_MAX, "/dev/mic%d", mic->id);
fd = open(path, O_RDWR);
if (fd < 0) {
mpsslog("Could not open %s %s\n", path, strerror(errno));
return;
}
err = ioctl(fd, MIC_VIRTIO_ADD_DEVICE, dd);
if (err < 0) {
mpsslog("Could not add %d %s\n", dd->type, strerror(errno));
close(fd);
return;
}
switch (dd->type) {
case VIRTIO_ID_NET:
mic->mic_net.virtio_net_fd = fd;
mpsslog("Added VIRTIO_ID_NET for %s\n", mic->name);
break;
case VIRTIO_ID_CONSOLE:
mic->mic_console.virtio_console_fd = fd;
mpsslog("Added VIRTIO_ID_CONSOLE for %s\n", mic->name);
break;
case VIRTIO_ID_BLOCK:
mic->mic_virtblk.virtio_block_fd = fd;
mpsslog("Added VIRTIO_ID_BLOCK for %s\n", mic->name);
break;
}
}
static bool
set_backend_file(struct mic_info *mic)
{
FILE *config;
char buff[PATH_MAX], *line, *evv, *p;
snprintf(buff, PATH_MAX, "%s/mpssd%03d.conf", mic_config_dir, mic->id);
config = fopen(buff, "r");
if (config == NULL)
return false;
do { /* look for "virtblk_backend=XXXX" */
line = fgets(buff, PATH_MAX, config);
if (line == NULL)
break;
if (*line == '#')
continue;
p = strchr(line, '\n');
if (p)
*p = '\0';
} while (strncmp(line, virtblk_backend, strlen(virtblk_backend)) != 0);
fclose(config);
if (line == NULL)
return false;
evv = strchr(line, '=');
if (evv == NULL)
return false;
mic->mic_virtblk.backend_file = malloc(strlen(evv) + 1);
if (mic->mic_virtblk.backend_file == NULL) {
mpsslog("%s %d can't allocate memory\n", mic->name, mic->id);
return false;
}
strcpy(mic->mic_virtblk.backend_file, evv + 1);
return true;
}
#define SECTOR_SIZE 512
static bool
set_backend_size(struct mic_info *mic)
{
mic->mic_virtblk.backend_size = lseek(mic->mic_virtblk.backend, 0,
SEEK_END);
if (mic->mic_virtblk.backend_size < 0) {
mpsslog("%s: can't seek: %s\n",
mic->name, mic->mic_virtblk.backend_file);
return false;
}
virtblk_dev_page.blk_config.capacity =
mic->mic_virtblk.backend_size / SECTOR_SIZE;
if ((mic->mic_virtblk.backend_size % SECTOR_SIZE) != 0)
virtblk_dev_page.blk_config.capacity++;
virtblk_dev_page.blk_config.capacity =
htole64(virtblk_dev_page.blk_config.capacity);
return true;
}
static bool
open_backend(struct mic_info *mic)
{
if (!set_backend_file(mic))
goto _error_exit;
mic->mic_virtblk.backend = open(mic->mic_virtblk.backend_file, O_RDWR);
if (mic->mic_virtblk.backend < 0) {
mpsslog("%s: can't open: %s\n", mic->name,
mic->mic_virtblk.backend_file);
goto _error_free;
}
if (!set_backend_size(mic))
goto _error_close;
mic->mic_virtblk.backend_addr = mmap(NULL,
mic->mic_virtblk.backend_size,
PROT_READ|PROT_WRITE, MAP_SHARED,
mic->mic_virtblk.backend, 0L);
if (mic->mic_virtblk.backend_addr == MAP_FAILED) {
mpsslog("%s: can't map: %s %s\n",
mic->name, mic->mic_virtblk.backend_file,
strerror(errno));
goto _error_close;
}
return true;
_error_close:
close(mic->mic_virtblk.backend);
_error_free:
free(mic->mic_virtblk.backend_file);
_error_exit:
return false;
}
static void
close_backend(struct mic_info *mic)
{
munmap(mic->mic_virtblk.backend_addr, mic->mic_virtblk.backend_size);
close(mic->mic_virtblk.backend);
free(mic->mic_virtblk.backend_file);
}
static bool
start_virtblk(struct mic_info *mic, struct mic_vring *vring)
{
if (((unsigned long)&virtblk_dev_page.blk_config % 8) != 0) {
mpsslog("%s: blk_config is not 8 byte aligned.\n",
mic->name);
return false;
}
add_virtio_device(mic, &virtblk_dev_page.dd);
if (MAP_FAILED == init_vr(mic, mic->mic_virtblk.virtio_block_fd,
VIRTIO_ID_BLOCK, vring, NULL,
virtblk_dev_page.dd.num_vq)) {
mpsslog("%s init_vr failed %s\n",
mic->name, strerror(errno));
return false;
}
return true;
}
static void
stop_virtblk(struct mic_info *mic)
{
int vr_size, ret;
vr_size = PAGE_ALIGN(vring_size(MIC_VRING_ENTRIES,
MIC_VIRTIO_RING_ALIGN) + sizeof(struct _mic_vring_info));
ret = munmap(mic->mic_virtblk.block_dp,
MIC_DEVICE_PAGE_END + vr_size * virtblk_dev_page.dd.num_vq);
if (ret < 0)
mpsslog("%s munmap errno %d\n", mic->name, errno);
close(mic->mic_virtblk.virtio_block_fd);
}
static __u8
header_error_check(struct vring_desc *desc)
{
if (le32toh(desc->len) != sizeof(struct virtio_blk_outhdr)) {
mpsslog("%s() %d: length is not sizeof(virtio_blk_outhd)\n",
__func__, __LINE__);
return -EIO;
}
if (!(le16toh(desc->flags) & VRING_DESC_F_NEXT)) {
mpsslog("%s() %d: alone\n",
__func__, __LINE__);
return -EIO;
}
if (le16toh(desc->flags) & VRING_DESC_F_WRITE) {
mpsslog("%s() %d: not read\n",
__func__, __LINE__);
return -EIO;
}
return 0;
}
static int
read_header(int fd, struct virtio_blk_outhdr *hdr, __u32 desc_idx)
{
struct iovec iovec;
struct mic_copy_desc copy;
iovec.iov_len = sizeof(*hdr);
iovec.iov_base = hdr;
copy.iov = &iovec;
copy.iovcnt = 1;
copy.vr_idx = 0; /* only one vring on virtio_block */
copy.update_used = false; /* do not update used index */
return ioctl(fd, MIC_VIRTIO_COPY_DESC, &copy);
}
static int
transfer_blocks(int fd, struct iovec *iovec, __u32 iovcnt)
{
struct mic_copy_desc copy;
copy.iov = iovec;
copy.iovcnt = iovcnt;
copy.vr_idx = 0; /* only one vring on virtio_block */
copy.update_used = false; /* do not update used index */
return ioctl(fd, MIC_VIRTIO_COPY_DESC, &copy);
}
static __u8
status_error_check(struct vring_desc *desc)
{
if (le32toh(desc->len) != sizeof(__u8)) {
mpsslog("%s() %d: length is not sizeof(status)\n",
__func__, __LINE__);
return -EIO;
}
return 0;
}
static int
write_status(int fd, __u8 *status)
{
struct iovec iovec;
struct mic_copy_desc copy;
iovec.iov_base = status;
iovec.iov_len = sizeof(*status);
copy.iov = &iovec;
copy.iovcnt = 1;
copy.vr_idx = 0; /* only one vring on virtio_block */
copy.update_used = true; /* Update used index */
return ioctl(fd, MIC_VIRTIO_COPY_DESC, &copy);
}
static void *
virtio_block(void *arg)
{
struct mic_info *mic = (struct mic_info *)arg;
int ret;
struct pollfd block_poll;
struct mic_vring vring;
__u16 avail_idx;
__u32 desc_idx;
struct vring_desc *desc;
struct iovec *iovec, *piov;
__u8 status;
__u32 buffer_desc_idx;
struct virtio_blk_outhdr hdr;
void *fos;
for (;;) { /* forever */
if (!open_backend(mic)) { /* No virtblk */
for (mic->mic_virtblk.signaled = 0;
!mic->mic_virtblk.signaled;)
sleep(1);
continue;
}
/* backend file is specified. */
if (!start_virtblk(mic, &vring))
goto _close_backend;
iovec = malloc(sizeof(*iovec) *
le32toh(virtblk_dev_page.blk_config.seg_max));
if (!iovec) {
mpsslog("%s: can't alloc iovec: %s\n",
mic->name, strerror(ENOMEM));
goto _stop_virtblk;
}
block_poll.fd = mic->mic_virtblk.virtio_block_fd;
block_poll.events = POLLIN;
for (mic->mic_virtblk.signaled = 0;
!mic->mic_virtblk.signaled;) {
block_poll.revents = 0;
/* timeout in 1 sec to see signaled */
ret = poll(&block_poll, 1, 1000);
if (ret < 0) {
mpsslog("%s %d: poll failed: %s\n",
__func__, __LINE__,
strerror(errno));
continue;
}
if (!(block_poll.revents & POLLIN)) {
#ifdef DEBUG
mpsslog("%s %d: block_poll.revents=0x%x\n",
__func__, __LINE__, block_poll.revents);
#endif
continue;
}
/* POLLIN */
while (vring.info->avail_idx !=
le16toh(vring.vr.avail->idx)) {
/* read header element */
avail_idx =
vring.info->avail_idx &
(vring.vr.num - 1);
desc_idx = le16toh(
vring.vr.avail->ring[avail_idx]);
desc = &vring.vr.desc[desc_idx];
#ifdef DEBUG
mpsslog("%s() %d: avail_idx=%d ",
__func__, __LINE__,
vring.info->avail_idx);
mpsslog("vring.vr.num=%d desc=%p\n",
vring.vr.num, desc);
#endif
status = header_error_check(desc);
ret = read_header(
mic->mic_virtblk.virtio_block_fd,
&hdr, desc_idx);
if (ret < 0) {
mpsslog("%s() %d %s: ret=%d %s\n",
__func__, __LINE__,
mic->name, ret,
strerror(errno));
break;
}
/* buffer element */
piov = iovec;
status = 0;
fos = mic->mic_virtblk.backend_addr +
(hdr.sector * SECTOR_SIZE);
buffer_desc_idx = next_desc(desc);
desc_idx = buffer_desc_idx;
for (desc = &vring.vr.desc[buffer_desc_idx];
desc->flags & VRING_DESC_F_NEXT;
desc_idx = next_desc(desc),
desc = &vring.vr.desc[desc_idx]) {
piov->iov_len = desc->len;
piov->iov_base = fos;
piov++;
fos += desc->len;
}
/* Returning NULLs for VIRTIO_BLK_T_GET_ID. */
if (hdr.type & ~(VIRTIO_BLK_T_OUT |
VIRTIO_BLK_T_GET_ID)) {
/*
VIRTIO_BLK_T_IN - does not do
anything. Probably for documenting.
VIRTIO_BLK_T_SCSI_CMD - for
virtio_scsi.
VIRTIO_BLK_T_FLUSH - turned off in
config space.
VIRTIO_BLK_T_BARRIER - defined but not
used in anywhere.
*/
mpsslog("%s() %d: type %x ",
__func__, __LINE__,
hdr.type);
mpsslog("is not supported\n");
status = -ENOTSUP;
} else {
ret = transfer_blocks(
mic->mic_virtblk.virtio_block_fd,
iovec,
piov - iovec);
if (ret < 0 &&
status != 0)
status = ret;
}
/* write status and update used pointer */
if (status != 0)
status = status_error_check(desc);
ret = write_status(
mic->mic_virtblk.virtio_block_fd,
&status);
#ifdef DEBUG
mpsslog("%s() %d: write status=%d on desc=%p\n",
__func__, __LINE__,
status, desc);
#endif
}
}
free(iovec);
_stop_virtblk:
stop_virtblk(mic);
_close_backend:
close_backend(mic);
} /* forever */
pthread_exit(NULL);
}
static void
reset(struct mic_info *mic)
{
#define RESET_TIMEOUT 120
int i = RESET_TIMEOUT;
setsysfs(mic->name, "state", "reset");
while (i) {
char *state;
state = readsysfs(mic->name, "state");
if (!state)
goto retry;
mpsslog("%s: %s %d state %s\n",
mic->name, __func__, __LINE__, state);
/*
* If the shutdown was initiated by OSPM, the state stays
* in "suspended" which is also a valid condition for reset.
*/
if ((!strcmp(state, "offline")) ||
(!strcmp(state, "suspended"))) {
free(state);
break;
}
free(state);
retry:
sleep(1);
i--;
}
}
static int
get_mic_shutdown_status(struct mic_info *mic, char *shutdown_status)
{
if (!strcmp(shutdown_status, "nop"))
return MIC_NOP;
if (!strcmp(shutdown_status, "crashed"))
return MIC_CRASHED;
if (!strcmp(shutdown_status, "halted"))
return MIC_HALTED;
if (!strcmp(shutdown_status, "poweroff"))
return MIC_POWER_OFF;
if (!strcmp(shutdown_status, "restart"))
return MIC_RESTART;
mpsslog("%s: BUG invalid status %s\n", mic->name, shutdown_status);
/* Invalid state */
assert(0);
};
static int get_mic_state(struct mic_info *mic, char *state)
{
if (!strcmp(state, "offline"))
return MIC_OFFLINE;
if (!strcmp(state, "online"))
return MIC_ONLINE;
if (!strcmp(state, "shutting_down"))
return MIC_SHUTTING_DOWN;
if (!strcmp(state, "reset_failed"))
return MIC_RESET_FAILED;
if (!strcmp(state, "suspending"))
return MIC_SUSPENDING;
if (!strcmp(state, "suspended"))
return MIC_SUSPENDED;
mpsslog("%s: BUG invalid state %s\n", mic->name, state);
/* Invalid state */
assert(0);
};
static void mic_handle_shutdown(struct mic_info *mic)
{
#define SHUTDOWN_TIMEOUT 60
int i = SHUTDOWN_TIMEOUT, ret, stat = 0;
char *shutdown_status;
while (i) {
shutdown_status = readsysfs(mic->name, "shutdown_status");
if (!shutdown_status)
continue;
mpsslog("%s: %s %d shutdown_status %s\n",
mic->name, __func__, __LINE__, shutdown_status);
switch (get_mic_shutdown_status(mic, shutdown_status)) {
case MIC_RESTART:
mic->restart = 1;
case MIC_HALTED:
case MIC_POWER_OFF:
case MIC_CRASHED:
free(shutdown_status);
goto reset;
default:
break;
}
free(shutdown_status);
sleep(1);
i--;
}
reset:
ret = kill(mic->pid, SIGTERM);
mpsslog("%s: %s %d kill pid %d ret %d\n",
mic->name, __func__, __LINE__,
mic->pid, ret);
if (!ret) {
ret = waitpid(mic->pid, &stat,
WIFSIGNALED(stat));
mpsslog("%s: %s %d waitpid ret %d pid %d\n",
mic->name, __func__, __LINE__,
ret, mic->pid);
}
if (ret == mic->pid)
reset(mic);
}
static void *
mic_config(void *arg)
{
struct mic_info *mic = (struct mic_info *)arg;
char *state = NULL;
char pathname[PATH_MAX];
int fd, ret;
struct pollfd ufds[1];
char value[4096];
snprintf(pathname, PATH_MAX - 1, "%s/%s/%s",
MICSYSFSDIR, mic->name, "state");
fd = open(pathname, O_RDONLY);
if (fd < 0) {
mpsslog("%s: opening file %s failed %s\n",
mic->name, pathname, strerror(errno));
goto error;
}
do {
ret = lseek(fd, 0, SEEK_SET);
if (ret < 0) {
mpsslog("%s: Failed to seek to file start '%s': %s\n",
mic->name, pathname, strerror(errno));
goto close_error1;
}
ret = read(fd, value, sizeof(value));
if (ret < 0) {
mpsslog("%s: Failed to read sysfs entry '%s': %s\n",
mic->name, pathname, strerror(errno));
goto close_error1;
}
retry:
state = readsysfs(mic->name, "state");
if (!state)
goto retry;
mpsslog("%s: %s %d state %s\n",
mic->name, __func__, __LINE__, state);
switch (get_mic_state(mic, state)) {
case MIC_SHUTTING_DOWN:
mic_handle_shutdown(mic);
goto close_error;
case MIC_SUSPENDING:
mic->boot_on_resume = 1;
setsysfs(mic->name, "state", "suspend");
mic_handle_shutdown(mic);
goto close_error;
case MIC_OFFLINE:
if (mic->boot_on_resume) {
setsysfs(mic->name, "state", "boot");
mic->boot_on_resume = 0;
}
break;
default:
break;
}
free(state);
ufds[0].fd = fd;
ufds[0].events = POLLERR | POLLPRI;
ret = poll(ufds, 1, -1);
if (ret < 0) {
mpsslog("%s: poll failed %s\n",
mic->name, strerror(errno));
goto close_error1;
}
} while (1);
close_error:
free(state);
close_error1:
close(fd);
error:
init_mic(mic);
pthread_exit(NULL);
}
static void
set_cmdline(struct mic_info *mic)
{
char buffer[PATH_MAX];
int len;
len = snprintf(buffer, PATH_MAX,
"clocksource=tsc highres=off nohz=off ");
len += snprintf(buffer + len, PATH_MAX - len,
"cpufreq_on;corec6_off;pc3_off;pc6_off ");
len += snprintf(buffer + len, PATH_MAX - len,
"ifcfg=static;address,172.31.%d.1;netmask,255.255.255.0",
mic->id);
setsysfs(mic->name, "cmdline", buffer);
mpsslog("%s: Command line: \"%s\"\n", mic->name, buffer);
snprintf(buffer, PATH_MAX, "172.31.%d.1", mic->id);
mpsslog("%s: IPADDR: \"%s\"\n", mic->name, buffer);
}
static void
set_log_buf_info(struct mic_info *mic)
{
int fd;
off_t len;
char system_map[] = "/lib/firmware/mic/System.map";
char *map, *temp, log_buf[17] = {'\0'};
fd = open(system_map, O_RDONLY);
if (fd < 0) {
mpsslog("%s: Opening System.map failed: %d\n",
mic->name, errno);
return;
}
len = lseek(fd, 0, SEEK_END);
if (len < 0) {
mpsslog("%s: Reading System.map size failed: %d\n",
mic->name, errno);
close(fd);
return;
}
map = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (map == MAP_FAILED) {
mpsslog("%s: mmap of System.map failed: %d\n",
mic->name, errno);
close(fd);
return;
}
temp = strstr(map, "__log_buf");
if (!temp) {
mpsslog("%s: __log_buf not found: %d\n", mic->name, errno);
munmap(map, len);
close(fd);
return;
}
strncpy(log_buf, temp - 19, 16);
setsysfs(mic->name, "log_buf_addr", log_buf);
mpsslog("%s: log_buf_addr: %s\n", mic->name, log_buf);
temp = strstr(map, "log_buf_len");
if (!temp) {
mpsslog("%s: log_buf_len not found: %d\n", mic->name, errno);
munmap(map, len);
close(fd);
return;
}
strncpy(log_buf, temp - 19, 16);
setsysfs(mic->name, "log_buf_len", log_buf);
mpsslog("%s: log_buf_len: %s\n", mic->name, log_buf);
munmap(map, len);
close(fd);
}
static void init_mic(struct mic_info *mic);
static void
change_virtblk_backend(int x, siginfo_t *siginfo, void *p)
{
struct mic_info *mic;
for (mic = mic_list.next; mic != NULL; mic = mic->next)
mic->mic_virtblk.signaled = 1/* true */;
}
static void
init_mic(struct mic_info *mic)
{
struct sigaction ignore = {
.sa_flags = 0,
.sa_handler = SIG_IGN
};
struct sigaction act = {
.sa_flags = SA_SIGINFO,
.sa_sigaction = change_virtblk_backend,
};
char buffer[PATH_MAX];
int err;
/*
* Currently, one virtio block device is supported for each MIC card
* at a time. Any user (or test) can send a SIGUSR1 to the MIC daemon.
* The signal informs the virtio block backend about a change in the
* configuration file which specifies the virtio backend file name on
* the host. Virtio block backend then re-reads the configuration file
* and switches to the new block device. This signalling mechanism may
* not be required once multiple virtio block devices are supported by
* the MIC daemon.
*/
sigaction(SIGUSR1, &ignore, NULL);
mic->pid = fork();
switch (mic->pid) {
case 0:
set_log_buf_info(mic);
set_cmdline(mic);
add_virtio_device(mic, &virtcons_dev_page.dd);
add_virtio_device(mic, &virtnet_dev_page.dd);
err = pthread_create(&mic->mic_console.console_thread, NULL,
virtio_console, mic);
if (err)
mpsslog("%s virtcons pthread_create failed %s\n",
mic->name, strerror(err));
err = pthread_create(&mic->mic_net.net_thread, NULL,
virtio_net, mic);
if (err)
mpsslog("%s virtnet pthread_create failed %s\n",
mic->name, strerror(err));
err = pthread_create(&mic->mic_virtblk.block_thread, NULL,
virtio_block, mic);
if (err)
mpsslog("%s virtblk pthread_create failed %s\n",
mic->name, strerror(err));
sigemptyset(&act.sa_mask);
err = sigaction(SIGUSR1, &act, NULL);
if (err)
mpsslog("%s sigaction SIGUSR1 failed %s\n",
mic->name, strerror(errno));
while (1)
sleep(60);
case -1:
mpsslog("fork failed MIC name %s id %d errno %d\n",
mic->name, mic->id, errno);
break;
default:
if (mic->restart) {
snprintf(buffer, PATH_MAX, "boot");
setsysfs(mic->name, "state", buffer);
mpsslog("%s restarting mic %d\n",
mic->name, mic->restart);
mic->restart = 0;
}
pthread_create(&mic->config_thread, NULL, mic_config, mic);
}
}
static void
start_daemon(void)
{
struct mic_info *mic;
for (mic = mic_list.next; mic != NULL; mic = mic->next)
init_mic(mic);
while (1)
sleep(60);
}
static int
init_mic_list(void)
{
struct mic_info *mic = &mic_list;
struct dirent *file;
DIR *dp;
int cnt = 0;
dp = opendir(MICSYSFSDIR);
if (!dp)
return 0;
while ((file = readdir(dp)) != NULL) {
if (!strncmp(file->d_name, "mic", 3)) {
mic->next = calloc(1, sizeof(struct mic_info));
if (mic->next) {
mic = mic->next;
mic->id = atoi(&file->d_name[3]);
mic->name = malloc(strlen(file->d_name) + 16);
if (mic->name)
strcpy(mic->name, file->d_name);
mpsslog("MIC name %s id %d\n", mic->name,
mic->id);
cnt++;
}
}
}
closedir(dp);
return cnt;
}
void
mpsslog(char *format, ...)
{
va_list args;
char buffer[4096];
char ts[52], *ts1;
time_t t;
if (logfp == NULL)
return;
va_start(args, format);
vsprintf(buffer, format, args);
va_end(args);
time(&t);
ts1 = ctime_r(&t, ts);
ts1[strlen(ts1) - 1] = '\0';
fprintf(logfp, "%s: %s", ts1, buffer);
fflush(logfp);
}
int
main(int argc, char *argv[])
{
int cnt;
pid_t pid;
myname = argv[0];
logfp = fopen(LOGFILE_NAME, "a+");
if (!logfp) {
fprintf(stderr, "cannot open logfile '%s'\n", LOGFILE_NAME);
exit(1);
}
pid = fork();
switch (pid) {
case 0:
break;
case -1:
exit(2);
default:
exit(0);
}
mpsslog("MIC Daemon start\n");
cnt = init_mic_list();
if (cnt == 0) {
mpsslog("MIC module not loaded\n");
exit(3);
}
mpsslog("MIC found %d devices\n", cnt);
start_daemon();
exit(0);
}
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