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authorOle Troan <ot@cisco.com>2020-05-20 15:47:06 +0200
committerNeale Ranns <nranns@cisco.com>2020-05-25 11:22:34 +0000
commitf5db3711b28db4e364ac01be8b124dd24d573782 (patch)
treeeee3c8aabae4287bf89c0e545e2400770fc223cb /src/vlibmemory
parentafc233aa93c3f23b30b756cb4ae2967f968bbbb1 (diff)
api: add new stream message convention
Instead of having to wrap dump/detail calls in control ping, send details messages in between a normal reply / request pair. As expressed in the below service statement. Example: service { rpc map_domains_gets returns map_domains_get_reply stream map_domain_details; }; define map_domains_get { u32 client_index; u32 context; u32 cursor; }; define map_domains_get_reply { u32 context; i32 retval; u32 cursor; }; To avoid blocking the main thread for too long, the replies are now sent in client message queue size chunks. The reply message returns VNET_API_ERROR_EAGAIN when there is more to read. The API handler must also include a "cursor" that is used to the next call to the get function. API handler example: REPLY_AND_DETAILS_MACRO (VL_API_MAP_DOMAINS_GET_REPLY, mm->domains, ({ send_domain_details (cursor, rp, mp->context); })); The macro starts from cursor and iterates through the pool until vl_api_process_may_suspend() returns true or the iteration reaches the end of the list. Client Example: cursor = 0 d = [] while True: rv, details = map_domains_get(cursor=cursor) d += details if rv.retval == 0 or rv.retval != -165: break cursor = rv.cursor or the convenience iterator: for x in vpp.details_iter(vpp.api.map_domains_get): pass or list(details_iter(map_domains_get)) Change-Id: Iad9f6b41b0ef886adb584c97708dd91cf552749e Type: feature Signed-off-by: Ole Troan <ot@cisco.com>
Diffstat (limited to 'src/vlibmemory')
-rw-r--r--src/vlibmemory/api.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/vlibmemory/api.h b/src/vlibmemory/api.h
index 6cd645bb1d5..662805373ba 100644
--- a/src/vlibmemory/api.h
+++ b/src/vlibmemory/api.h
@@ -53,6 +53,28 @@ vl_api_can_send_msg (vl_api_registration_t * rp)
return vl_mem_api_can_send (rp->vl_input_queue);
}
+/*
+ * Suggests to an API handler to relinguish control. Currently limits
+ * an handler to a maximum of 1ms or it earlier if the client queue is
+ * full.
+ *
+ * May be enhanced in the future based on other performance
+ * characteristics of the main thread.
+ */
+#define VL_API_MAX_TIME_IN_HANDLER 0.001 /* 1 ms */
+always_inline int
+vl_api_process_may_suspend (vlib_main_t * vm, vl_api_registration_t * rp,
+ f64 start)
+{
+ /* Is client queue full (leave space for reply message) */
+ if (rp->registration_type <= REGISTRATION_TYPE_SHMEM &&
+ rp->vl_input_queue->cursize + 1 >= rp->vl_input_queue->maxsize)
+ return true;
+ if (vlib_time_now (vm) > start + VL_API_MAX_TIME_IN_HANDLER)
+ return true;
+ return false;
+}
+
always_inline vl_api_registration_t *
vl_api_client_index_to_registration (u32 index)
{