40e8552e32
Signed-off-by: Pavel Boldin <pboldin@mirantis.com> Acked-by: Huawei Xie <huawei.xie@intel.com>
105 lines
3.0 KiB
C
105 lines
3.0 KiB
C
/*-
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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 <unistd.h>
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#include <sys/eventfd.h>
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#include <sys/ioctl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <rte_log.h>
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#include "eventfd_link/eventfd_link.h"
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#include "eventfd_copy.h"
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#include "vhost-net.h"
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static const char eventfd_cdev[] = "/dev/eventfd-link";
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static int eventfd_link = -1;
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int
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eventfd_init(void)
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{
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if (eventfd_link >= 0)
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return 0;
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eventfd_link = open(eventfd_cdev, O_RDWR);
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if (eventfd_link < 0) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"eventfd_link module is not loaded\n");
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return -1;
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}
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return 0;
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}
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int
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eventfd_free(void)
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{
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if (eventfd_link >= 0)
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close(eventfd_link);
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return 0;
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}
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/*
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* This function uses the eventfd_link kernel module to copy an eventfd file
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* descriptor provided by QEMU in to our process space.
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*/
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int
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eventfd_copy(int target_fd, int target_pid)
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{
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int ret;
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struct eventfd_copy2 eventfd_copy2;
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/* Open the character device to the kernel module. */
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/* TODO: check this earlier rather than fail until VM boots! */
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if (eventfd_init() < 0)
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return -1;
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eventfd_copy2.fd = target_fd;
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eventfd_copy2.pid = target_pid;
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eventfd_copy2.flags = O_NONBLOCK | O_CLOEXEC;
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/* Call the IOCTL to copy the eventfd. */
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ret = ioctl(eventfd_link, EVENTFD_COPY2, &eventfd_copy2);
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if (ret < 0) {
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RTE_LOG(ERR, VHOST_CONFIG,
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"EVENTFD_COPY2 ioctl failed\n");
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return -1;
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}
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return ret;
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}
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