[dpdk-dev] [PATCH] Unlink existing unused sockets at start up
Ilya Maximets
i.maximets at samsung.com
Thu Dec 17 12:47:49 CET 2015
On 17.12.2015 07:21, Zhihong Wang wrote:
> This patch unlinks existing unused sockets (which cause new bindings to fail, e.g. vHost PMD) to ensure smooth startup.
> In a lot of cases DPDK applications are terminated abnormally without proper resource release.
Original OVS related problem discussed previously here
( http://dpdk.org/ml/archives/dev/2015-December/030326.html )
fixed in OVS by
commit 9b5422a98f817b9f2a1f8224cab7e1a8d0bbba1f
Author: Ilya Maximets <i.maximets at samsung.com>
Date: Wed Dec 16 15:32:21 2015 +0300
ovs-lib: Try to call exit before killing.
While killing OVS may not free all allocated resources.
Example:
Socket for vhost-user port will stay in a system
after 'systemctl stop openvswitch' and opening
that port after restart will fail.
So, the crash of application is the last point of discussion.
> Therefore, DPDK libs should be able to deal with unclean boot environment.
Why are you think that recovery after crash of application
is a problem of underneath library?
Best regards, Ilya Maximets.
>
> Signed-off-by: Zhihong Wang <zhihong.wang at intel.com>
> ---
> lib/librte_vhost/vhost_user/vhost-net-user.c | 28 ++++++++++++++++++++++++----
> 1 file changed, 24 insertions(+), 4 deletions(-)
>
> diff --git a/lib/librte_vhost/vhost_user/vhost-net-user.c b/lib/librte_vhost/vhost_user/vhost-net-user.c
> index 8b7a448..eac0721 100644
> --- a/lib/librte_vhost/vhost_user/vhost-net-user.c
> +++ b/lib/librte_vhost/vhost_user/vhost-net-user.c
> @@ -120,18 +120,38 @@ uds_socket(const char *path)
> sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
> if (sockfd < 0)
> return -1;
> - RTE_LOG(INFO, VHOST_CONFIG, "socket created, fd:%d\n", sockfd);
> + RTE_LOG(INFO, VHOST_CONFIG, "socket created, fd: %d\n", sockfd);
>
> memset(&un, 0, sizeof(un));
> un.sun_family = AF_UNIX;
> snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
> ret = bind(sockfd, (struct sockaddr *)&un, sizeof(un));
> if (ret == -1) {
> - RTE_LOG(ERR, VHOST_CONFIG, "fail to bind fd:%d, remove file:%s and try again.\n",
> + RTE_LOG(ERR, VHOST_CONFIG,
> + "bind fd: %d to file: %s failed, checking socket...\n",
> sockfd, path);
> - goto err;
> + ret = connect(sockfd, (struct sockaddr *)&un, sizeof(un));
> + if (ret == -1) {
> + RTE_LOG(INFO, VHOST_CONFIG,
> + "socket: %s is inactive, rebinding after unlink...\n", path);
> + unlink(path);
> + ret = bind(sockfd, (struct sockaddr *)&un, sizeof(un));
> + if (ret == -1) {
> + RTE_LOG(ERR, VHOST_CONFIG,
> + "bind fd: %d to file: %s failed even after unlink\n",
> + sockfd, path);
> + goto err;
> + }
> + } else {
> + RTE_LOG(INFO, VHOST_CONFIG,
> + "socket: %s is alive, remove it and try again\n", path);
> + RTE_LOG(ERR, VHOST_CONFIG,
> + "bind fd: %d to file: %s failed\n", sockfd, path);
> + goto err;
> + }
> }
> - RTE_LOG(INFO, VHOST_CONFIG, "bind to %s\n", path);
> + RTE_LOG(INFO, VHOST_CONFIG,
> + "bind fd: %d to file: %s successful\n", sockfd, path);
>
> ret = listen(sockfd, MAX_VIRTIO_BACKLOG);
> if (ret == -1)
>
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