diff options
Diffstat (limited to 'sys/dev/hyperv/vmbus/hv_connection.c')
| -rw-r--r-- | sys/dev/hyperv/vmbus/hv_connection.c | 40 |
1 files changed, 22 insertions, 18 deletions
diff --git a/sys/dev/hyperv/vmbus/hv_connection.c b/sys/dev/hyperv/vmbus/hv_connection.c index aa1e59e..e170298 100644 --- a/sys/dev/hyperv/vmbus/hv_connection.c +++ b/sys/dev/hyperv/vmbus/hv_connection.c @@ -364,31 +364,35 @@ hv_vmbus_on_events(int cpu) /** * Send a msg on the vmbus's message connection */ -int hv_vmbus_post_message(void *buffer, size_t bufferLen) { - int ret = 0; +int hv_vmbus_post_message(void *buffer, size_t bufferLen) +{ hv_vmbus_connection_id connId; - unsigned retries = 0; + sbintime_t time = SBT_1MS; + int retries; + int ret; - /* NetScaler delays from previous code were consolidated here */ - static int delayAmount[] = {100, 100, 100, 500, 500, 5000, 5000, 5000}; + connId.as_uint32_t = 0; + connId.u.id = HV_VMBUS_MESSAGE_CONNECTION_ID; - /* for(each entry in delayAmount) try to post message, - * delay a little bit before retrying + /* + * We retry to cope with transient failures caused by host side's + * insufficient resources. 20 times should suffice in practice. */ - for (retries = 0; - retries < sizeof(delayAmount)/sizeof(delayAmount[0]); retries++) { - connId.as_uint32_t = 0; - connId.u.id = HV_VMBUS_MESSAGE_CONNECTION_ID; - ret = hv_vmbus_post_msg_via_msg_ipc(connId, 1, buffer, bufferLen); - if (ret != HV_STATUS_INSUFFICIENT_BUFFERS) - break; - /* TODO: KYS We should use a blocking wait call */ - DELAY(delayAmount[retries]); + for (retries = 0; retries < 20; retries++) { + ret = hv_vmbus_post_msg_via_msg_ipc(connId, 1, buffer, + bufferLen); + if (ret == HV_STATUS_SUCCESS) + return (0); + + pause_sbt("pstmsg", time, 0, C_HARDCLOCK); + if (time < SBT_1S * 2) + time *= 2; } - KASSERT(ret == 0, ("Error VMBUS: Message Post Failed\n")); + KASSERT(ret == HV_STATUS_SUCCESS, + ("Error VMBUS: Message Post Failed, ret=%d\n", ret)); - return (ret); + return (EAGAIN); } /** |
