diff options
author | 2016-06-14 07:50:17 -0700 | |
---|---|---|
committer | 2016-06-14 12:17:54 -0700 | |
commit | 97f17497d162afdb82c8704bf097f0fee3724b2e (patch) | |
tree | 1c6269614c0c15ffef8451c58ae8f8b30a1bc804 /lib/librte_vhost/vhost_cuse/eventfd_copy.c | |
parent | e04be89c2409570e0055b2cda60bd11395bb93b0 (diff) |
Imported Upstream version 16.04
Change-Id: I77eadcd8538a9122e4773cbe55b24033dc451757
Signed-off-by: C.J. Collier <cjcollier@linuxfoundation.org>
Diffstat (limited to 'lib/librte_vhost/vhost_cuse/eventfd_copy.c')
-rw-r--r-- | lib/librte_vhost/vhost_cuse/eventfd_copy.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/lib/librte_vhost/vhost_cuse/eventfd_copy.c b/lib/librte_vhost/vhost_cuse/eventfd_copy.c new file mode 100644 index 00000000..154b32a4 --- /dev/null +++ b/lib/librte_vhost/vhost_cuse/eventfd_copy.c @@ -0,0 +1,104 @@ +/*- + * BSD LICENSE + * + * Copyright(c) 2010-2014 Intel Corporation. All rights reserved. + * All rights reserved. + * + * 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 Intel Corporation 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 THE COPYRIGHT + * OWNER OR CONTRIBUTORS 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. + */ + +#include <unistd.h> +#include <sys/eventfd.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> + +#include <rte_log.h> + +#include "eventfd_link/eventfd_link.h" +#include "eventfd_copy.h" +#include "vhost-net.h" + +static const char eventfd_cdev[] = "/dev/eventfd-link"; + +static int eventfd_link = -1; + +int +eventfd_init(void) +{ + if (eventfd_link >= 0) + return 0; + + eventfd_link = open(eventfd_cdev, O_RDWR); + if (eventfd_link < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "eventfd_link module is not loaded\n"); + return -1; + } + + return 0; +} + +int +eventfd_free(void) +{ + if (eventfd_link >= 0) + close(eventfd_link); + return 0; +} + +/* + * This function uses the eventfd_link kernel module to copy an eventfd file + * descriptor provided by QEMU in to our process space. + */ +int +eventfd_copy(int target_fd, int target_pid) +{ + int ret; + struct eventfd_copy2 eventfd_copy2; + + + /* Open the character device to the kernel module. */ + /* TODO: check this earlier rather than fail until VM boots! */ + if (eventfd_init() < 0) + return -1; + + eventfd_copy2.fd = target_fd; + eventfd_copy2.pid = target_pid; + eventfd_copy2.flags = O_NONBLOCK | O_CLOEXEC; + /* Call the IOCTL to copy the eventfd. */ + ret = ioctl(eventfd_link, EVENTFD_COPY2, &eventfd_copy2); + + if (ret < 0) { + RTE_LOG(ERR, VHOST_CONFIG, + "EVENTFD_COPY2 ioctl failed\n"); + return -1; + } + + return ret; +} |