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authorSteven <sluong@cisco.com>2017-03-22 12:05:19 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2017-03-29 09:34:48 +0000
commit0d150bb132b81c20b38a0cefd82c8f718435515d (patch)
treeae4a056df2678fa44d13c458c071a2e677b1f295 /src/vnet/devices/virtio/vhost-user.c
parent4521afa9a643983c789b6b3a77b14c0a95d5e0b2 (diff)
vhost: vhost-user component may become unusable with too many open files (VPP-668)
When the number of open files is reached in the system, vhost may encounter a failure in socket call and return from vhost-user-process. The return terminates all attempts of incoming socket connections in the future, even if the condition is reconciled. The fix is to not return from vhost-user-process, record the error in the interface, spit out the error, and retry the connection every 3 seconds. Change-Id: I806baedf13e8c9b73e7c7820c094240f39949950 Signed-off-by: Steven <sluong@cisco.com>
Diffstat (limited to 'src/vnet/devices/virtio/vhost-user.c')
-rw-r--r--src/vnet/devices/virtio/vhost-user.c29
1 files changed, 20 insertions, 9 deletions
diff --git a/src/vnet/devices/virtio/vhost-user.c b/src/vnet/devices/virtio/vhost-user.c
index 5ad4cb62bee..00807dc0398 100644
--- a/src/vnet/devices/virtio/vhost-user.c
+++ b/src/vnet/devices/virtio/vhost-user.c
@@ -2440,14 +2440,11 @@ vhost_user_process (vlib_main_t * vm,
f64 timeout = 3153600000.0 /* 100 years */ ;
uword *event_data = 0;
- sockfd = socket (AF_UNIX, SOCK_STREAM, 0);
+ sockfd = -1;
sun.sun_family = AF_UNIX;
template.read_function = vhost_user_socket_read;
template.error_function = vhost_user_socket_error;
- if (sockfd < 0)
- return 0;
-
while (1)
{
vlib_process_wait_for_event_or_clock (vm, timeout);
@@ -2462,6 +2459,23 @@ vhost_user_process (vlib_main_t * vm,
if (vui->unix_server_index == ~0) { //Nothing to do for server sockets
if (vui->unix_file_index == ~0)
{
+ if ((sockfd < 0) &&
+ ((sockfd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0))
+ {
+ /*
+ * 1st time error or new error for this interface,
+ * spit out the message and record the error
+ */
+ if (!vui->sock_errno || (vui->sock_errno != errno))
+ {
+ clib_unix_warning
+ ("Error: Could not open unix socket for %s",
+ vui->sock_filename);
+ vui->sock_errno = errno;
+ }
+ continue;
+ }
+
/* try to connect */
strncpy (sun.sun_path, (char *) vui->sock_filename,
sizeof (sun.sun_path) - 1);
@@ -2483,11 +2497,8 @@ vhost_user_process (vlib_main_t * vm,
vui - vhost_user_main.vhost_user_interfaces;
vui->unix_file_index = unix_file_add (&unix_main, &template);
- //Re-open for next connect
- if ((sockfd = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) {
- clib_warning("Critical: Could not open unix socket");
- return 0;
- }
+ /* This sockfd is considered consumed */
+ sockfd = -1;
}
else
{