ipc: handle unsupported IPC in async request

[dpdk.git] / lib / librte_eal / common / include / rte_eal.h

diff --git a/lib/librte_eal/common/include/rte_eal.h b/lib/librte_eal/common/include/rte_eal.h
index 3ee897c..cf701e1 100644 (file)
--- a/lib/librte_eal/common/include/rte_eal.h
+++ b/lib/librte_eal/common/include/rte_eal.h
@@ -41,7 +41,7 @@ enum rte_lcore_role_t {
 };
 
 /**
- * The type of process in a linuxapp, multi-process setup
+ * The type of process in a linux, multi-process setup
  */
 enum rte_proc_type_t {
        RTE_PROC_AUTO = -1,   /* allow auto-detection of primary/secondary */
@@ -174,9 +174,6 @@ int rte_eal_iopl_init(void);
 int rte_eal_init(int argc, char **argv);
 
 /**
- * @warning
- * @b EXPERIMENTAL: this API may change without prior notice
- *
  * Clean up the Environment Abstraction Layer (EAL)
  *
  * This function must be called to release any internal resources that EAL has
@@ -187,7 +184,7 @@ int rte_eal_init(int argc, char **argv);
  * @return 0 Successfully released all internal EAL resources
  * @return -EFAULT There was an error in releasing all resources.
  */
-int __rte_experimental rte_eal_cleanup(void);
+int rte_eal_cleanup(void);
 
 /**
  * Check if a primary process is currently alive
@@ -228,6 +225,13 @@ struct rte_mp_reply {
  *
  * As we create  socket channel for primary/secondary communication, use
  * this function typedef to register action for coming messages.
+ *
+ * @note When handling IPC request callbacks, the reply must be sent even in
+ *   cases of error handling. Simply returning success or failure will *not*
+ *   send a response to the requestor.
+ *   Implementation of error signalling mechanism is up to the application.
+ *
+ * @note No memory allocations should take place inside the callback.
  */
 typedef int (*rte_mp_t)(const struct rte_mp_msg *msg, const void *peer);
 
@@ -237,6 +241,13 @@ typedef int (*rte_mp_t)(const struct rte_mp_msg *msg, const void *peer);
  * As we create socket channel for primary/secondary communication, use
  * this function typedef to register action for coming responses to asynchronous
  * requests.
+ *
+ * @note When handling IPC request callbacks, the reply must be sent even in
+ *   cases of error handling. Simply returning success or failure will *not*
+ *   send a response to the requestor.
+ *   Implementation of error signalling mechanism is up to the application.
+ *
+ * @note No memory allocations should take place inside the callback.
  */
 typedef int (*rte_mp_async_reply_t)(const struct rte_mp_msg *request,
                const struct rte_mp_reply *reply);
@@ -251,6 +262,9 @@ typedef int (*rte_mp_async_reply_t)(const struct rte_mp_msg *request,
  * to response the messages from the corresponding component in its primary
  * process or secondary processes.
  *
+ * @note IPC may be unsupported in certain circumstances, so caller should check
+ *    for ENOTSUP error.
+ *
  * @param name
  *   The name argument plays as the nonredundant key to find the action.
  *
@@ -274,6 +288,9 @@ rte_mp_action_register(const char *name, rte_mp_t action);
  * not want to response the messages from the corresponding component in its
  * primary process or secondary processes.
  *
+ * @note IPC may be unsupported in certain circumstances, so caller should check
+ *    for ENOTSUP error.
+ *
  * @param name
  *   The name argument plays as the nonredundant key to find the action.
  *
@@ -287,7 +304,7 @@ rte_mp_action_unregister(const char *name);
  *
  * Send a message to the peer process.
  *
- * This function will send a message which will be responsed by the action
+ * This function will send a message which will be responded by the action
  * identified by name in the peer process.
  *
  * @param msg
@@ -311,12 +328,18 @@ rte_mp_sendmsg(struct rte_mp_msg *msg);
  *
  * @note The caller is responsible to free reply->replies.
  *
+ * @note This API must not be used inside memory-related or IPC callbacks, and
+ *   no memory allocations should take place inside such callback.
+ *
+ * @note IPC may be unsupported in certain circumstances, so caller should check
+ *    for ENOTSUP error.
+ *
  * @param req
  *   The req argument contains the customized request message.
  *
  * @param reply
  *   The reply argument will be for storing all the replied messages;
- *   the caller is responsible for free reply->replies.
+ *   the caller is responsible for free reply->msgs.
  *
  * @param ts
  *   The ts argument specifies how long we can wait for the peer(s) to reply.
@@ -338,6 +361,9 @@ rte_mp_request_sync(struct rte_mp_msg *req, struct rte_mp_reply *reply,
  * This function sends a request message to the peer process, and will not
  * block. Instead, reply will be received in a separate callback.
  *
+ * @note IPC may be unsupported in certain circumstances, so caller should check
+ *    for ENOTSUP error.
+ *
  * @param req
  *   The req argument contains the customized request message.
  *
@@ -364,6 +390,11 @@ rte_mp_request_async(struct rte_mp_msg *req, const struct timespec *ts,
  * This function will send a reply message in response to a request message
  * received previously.
  *
+ * @note When handling IPC request callbacks, the reply must be sent even in
+ *   cases of error handling. Simply returning success or failure will *not*
+ *   send a response to the requestor.
+ *   Implementation of error signalling mechanism is up to the application.
+ *
  * @param msg
  *   The msg argument contains the customized message.
  *
@@ -424,7 +455,7 @@ rte_set_application_usage_hook(rte_usage_hook_t usage_func);
 #define RTE_EAL_TAILQ_RWLOCK         (&rte_eal_get_configuration()->mem_config->qlock)
 
 /**
- * macro to get the multiple lock of mempool shared by mutiple-instance
+ * macro to get the multiple lock of mempool shared by multiple-instance
  */
 #define RTE_EAL_MEMPOOL_RWLOCK            (&rte_eal_get_configuration()->mem_config->mplock)
 
@@ -507,6 +538,15 @@ enum rte_iova_mode rte_eal_iova_mode(void);
 const char *
 rte_eal_mbuf_user_pool_ops(void);
 
+/**
+ * Get the runtime directory of DPDK
+ *
+ * @return
+ *  The runtime directory path of DPDK
+ */
+const char *
+rte_eal_get_runtime_dir(void);
+
 #ifdef __cplusplus
 }
 #endif