power: vm communication channels in guest
Allows for the opening of Virtio-Serial devices on a VM, where a DPDK application can send packets to the host based monitor. The packet formatted is specified in channel_commands.h Each device appears as a serial device in path /dev/virtio-ports/virtio.serial.port.<agent_type>.<lcore_num> where each lcore in a DPDK application has exclusive to a device/channel. Each channel is opened in non-blocking mode, after a successful open a test packet is send to the host to ensure the host side is monitoring. Signed-off-by: Alan Carew <alan.carew@intel.com> Signed-off-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>
This commit is contained in:
Alan Carew
Thomas Monjalon
parent
f5e5c3347a
commit
cd0d5547e8
162
lib/librte_power/guest_channel.c
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162
lib/librte_power/guest_channel.c
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/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <signal.h>
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#include <limits.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <rte_log.h>
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#include <rte_config.h>
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#include "guest_channel.h"
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#include "channel_commands.h"
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#define RTE_LOGTYPE_GUEST_CHANNEL RTE_LOGTYPE_USER1
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static int global_fds[RTE_MAX_LCORE];
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int
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guest_channel_host_connect(const char *path, unsigned lcore_id)
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{
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int flags, ret;
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struct channel_packet pkt;
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char fd_path[PATH_MAX];
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int fd = -1;
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if (lcore_id >= RTE_MAX_LCORE) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
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lcore_id, RTE_MAX_LCORE-1);
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return -1;
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}
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/* check if path is already open */
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if (global_fds[lcore_id] != 0) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is already open with fd %d\n",
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lcore_id, global_fds[lcore_id]);
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return -1;
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}
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snprintf(fd_path, PATH_MAX, "%s.%u", path, lcore_id);
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RTE_LOG(INFO, GUEST_CHANNEL, "Opening channel '%s' for lcore %u\n",
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fd_path, lcore_id);
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fd = open(fd_path, O_RDWR);
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if (fd < 0) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Unable to to connect to '%s' with error "
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"%s\n", fd_path, strerror(errno));
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return -1;
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}
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flags = fcntl(fd, F_GETFL, 0);
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if (flags < 0) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Failed on fcntl get flags for file %s\n",
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fd_path);
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goto error;
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}
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flags |= O_NONBLOCK;
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if (fcntl(fd, F_SETFL, flags) < 0) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Failed on setting non-blocking mode for "
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"file %s", fd_path);
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goto error;
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}
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/* QEMU needs a delay after connection */
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sleep(1);
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/* Send a test packet, this command is ignored by the host, but a successful
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* send indicates that the host endpoint is monitoring.
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*/
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pkt.command = CPU_POWER_CONNECT;
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global_fds[lcore_id] = fd;
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ret = guest_channel_send_msg(&pkt, lcore_id);
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if (ret != 0) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Error on channel '%s' communications "
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"test: %s\n", fd_path, strerror(ret));
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goto error;
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}
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RTE_LOG(INFO, GUEST_CHANNEL, "Channel '%s' is now connected\n", fd_path);
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return 0;
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error:
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close(fd);
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global_fds[lcore_id] = 0;
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return -1;
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}
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int
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guest_channel_send_msg(struct channel_packet *pkt, unsigned lcore_id)
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{
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int ret, buffer_len = sizeof(*pkt);
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void *buffer = pkt;
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if (lcore_id >= RTE_MAX_LCORE) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
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lcore_id, RTE_MAX_LCORE-1);
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return -1;
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}
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if (global_fds[lcore_id] == 0) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Channel is not connected\n");
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return -1;
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}
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while (buffer_len > 0) {
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ret = write(global_fds[lcore_id], buffer, buffer_len);
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if (ret == buffer_len)
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return 0;
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if (ret == -1) {
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if (errno == EINTR)
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continue;
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return errno;
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}
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buffer = (char *)buffer + ret;
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buffer_len -= ret;
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}
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return 0;
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}
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void
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guest_channel_host_disconnect(unsigned lcore_id)
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{
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if (lcore_id >= RTE_MAX_LCORE) {
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RTE_LOG(ERR, GUEST_CHANNEL, "Channel(%u) is out of range 0...%d\n",
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lcore_id, RTE_MAX_LCORE-1);
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return;
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}
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if (global_fds[lcore_id] == 0)
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return;
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close(global_fds[lcore_id]);
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global_fds[lcore_id] = 0;
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}
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89
lib/librte_power/guest_channel.h
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89
lib/librte_power/guest_channel.h
Normal file
@ -0,0 +1,89 @@
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/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _GUEST_CHANNEL_H
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#define _GUEST_CHANNEL_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <channel_commands.h>
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/**
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* Connect to the Virtio-Serial VM end-point located in path. It is
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* thread safe for unique lcore_ids. This function must be only called once from
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* each lcore.
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*
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* @param path
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* The path to the serial device on the filesystem
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* @param lcore_id
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* lcore_id.
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*
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* @return
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* - 0 on success.
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* - Negative on error.
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*/
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int guest_channel_host_connect(const char *path, unsigned lcore_id);
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/**
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* Disconnect from an already connected Virtio-Serial Endpoint.
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*
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*
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* @param lcore_id
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* lcore_id.
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*
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*/
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void guest_channel_host_disconnect(unsigned lcore_id);
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/**
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* Send a message contained in pkt over the Virtio-Serial to the host endpoint.
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*
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* @param pkt
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* Pointer to a populated struct guest_agent_pkt
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*
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* @param lcore_id
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* lcore_id.
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*
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* @return
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* - 0 on success.
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* - Negative on channel not connected.
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* - errno on write to channel error.
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*/
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int guest_channel_send_msg(struct channel_packet *pkt, unsigned lcore_id);
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#ifdef __cplusplus
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}
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#endif
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#endif
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