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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <limits.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <poll.h>
#include <rte_log.h>
#include "guest_channel.h"
#include "channel_commands.h"
#define RTE_LOGTYPE_GUEST_CHANNEL RTE_LOGTYPE_USER1
/* Timeout for incoming message in milliseconds. */
#define TIMEOUT 10
static int global_fds[RTE_MAX_LCORE] = { [0 ... RTE_MAX_LCORE-1] = -1 };
int
guest_channel_host_connect(const char *path, unsigned int lcore_id)
{
int flags, ret;
struct channel_packet pkt;
char fd_path[PATH_MAX];
int fd = -1;
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return -1;
}
/* check if path is already open */
if (global_fds[lcore_id] != -1) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is already open with fd %d\n",
lcore_id, global_fds[lcore_id]);
return -1;
}
snprintf(fd_path, PATH_MAX, "%s.%u", path, lcore_id);
RTE_LOG(INFO, GUEST_CHANNEL, "Opening channel '%s' for lcore %u\n",
fd_path, lcore_id);
fd = open(fd_path, O_RDWR);
if (fd < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Unable to to connect to '%s' with error "
"%s\n", fd_path, strerror(errno));
return -1;
}
flags = fcntl(fd, F_GETFL, 0);
if (flags < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Failed on fcntl get flags for file %s\n",
fd_path);
goto error;
}
flags |= O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Failed on setting non-blocking mode for "
"file %s", fd_path);
goto error;
}
/* QEMU needs a delay after connection */
sleep(1);
/* Send a test packet, this command is ignored by the host, but a successful
* send indicates that the host endpoint is monitoring.
*/
pkt.command = CPU_POWER_CONNECT;
global_fds[lcore_id] = fd;
ret = guest_channel_send_msg(&pkt, lcore_id);
if (ret != 0) {
RTE_LOG(ERR, GUEST_CHANNEL,
"Error on channel '%s' communications test: %s\n",
fd_path, ret > 0 ? strerror(ret) :
"channel not connected");
goto error;
}
RTE_LOG(INFO, GUEST_CHANNEL, "Channel '%s' is now connected\n", fd_path);
return 0;
error:
close(fd);
global_fds[lcore_id] = -1;
return -1;
}
int
guest_channel_send_msg(struct channel_packet *pkt, unsigned int lcore_id)
{
int ret, buffer_len = sizeof(*pkt);
void *buffer = pkt;
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return -1;
}
if (global_fds[lcore_id] < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel is not connected\n");
return -1;
}
while (buffer_len > 0) {
ret = write(global_fds[lcore_id], buffer, buffer_len);
if (ret == buffer_len)
return 0;
if (ret == -1) {
if (errno == EINTR)
continue;
return errno;
}
buffer = (char *)buffer + ret;
buffer_len -= ret;
}
return 0;
}
int rte_power_guest_channel_send_msg(struct channel_packet *pkt,
unsigned int lcore_id)
{
return guest_channel_send_msg(pkt, lcore_id);
}
int power_guest_channel_read_msg(void *pkt,
size_t pkt_len,
unsigned int lcore_id)
{
int ret;
struct pollfd fds;
if (pkt_len == 0 || pkt == NULL)
return -1;
fds.fd = global_fds[lcore_id];
fds.events = POLLIN;
ret = poll(&fds, 1, TIMEOUT);
if (ret == 0) {
RTE_LOG(DEBUG, GUEST_CHANNEL, "Timeout occurred during poll function.\n");
return -1;
} else if (ret < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Error occurred during poll function: %s\n",
strerror(errno));
return -1;
}
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return -1;
}
if (global_fds[lcore_id] < 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel is not connected\n");
return -1;
}
while (pkt_len > 0) {
ret = read(global_fds[lcore_id],
pkt, pkt_len);
if (ret < 0) {
if (errno == EINTR)
continue;
return -1;
}
if (ret == 0) {
RTE_LOG(ERR, GUEST_CHANNEL, "Expected more data, but connection has been closed.\n");
return -1;
}
pkt = (char *)pkt + ret;
pkt_len -= ret;
}
return 0;
}
int rte_power_guest_channel_receive_msg(void *pkt,
size_t pkt_len,
unsigned int lcore_id)
{
return power_guest_channel_read_msg(pkt, pkt_len, lcore_id);
}
void
guest_channel_host_disconnect(unsigned int lcore_id)
{
if (lcore_id >= RTE_MAX_LCORE) {
RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
lcore_id, RTE_MAX_LCORE-1);
return;
}
if (global_fds[lcore_id] < 0)
return;
close(global_fds[lcore_id]);
global_fds[lcore_id] = -1;
}
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