UCP/WIREUP: Add flush+destroy of UCT EPs used by TMP EP lanes

src/ucp/wireup/wireup.c

@@ -271,9 +271,9 @@ ucp_wireup_match_p2p_lanes(ucp_ep_h ep,
 
 static ucs_status_t
 ucp_wireup_find_remote_p2p_addr(ucp_ep_h ep, ucp_lane_index_t remote_lane,
-                               const ucp_unpacked_address_t *remote_address,
-                               const uct_ep_addr_t **ep_addr_p,
-                               const uct_device_addr_t **dev_addr_p)
+                                const ucp_unpacked_address_t *remote_address,
+                                const uct_ep_addr_t **ep_addr_p,
+                                const uct_device_addr_t **dev_addr_p)
 {
     const ucp_address_entry_t *address;
     unsigned ep_addr_index;
@@ -292,6 +292,35 @@ ucp_wireup_find_remote_p2p_addr(ucp_ep_h ep, ucp_lane_index_t remote_lane,
     return UCS_ERR_UNREACHABLE;
 }
 
+static ucp_lane_index_t
+ucp_wireup_ep_lane_used_by_another_ep_config(ucp_ep_config_key_t *ep_config_key,
+                                             ucp_ep_config_key_t *another_ep_config_key,
+                                             ucp_lane_index_t lane)
+{
+    ucp_lane_index_t another_lane;
+
+    for (another_lane = 0; another_lane < another_ep_config_key->num_lanes;
+         ++another_lane) {
+        if (ucp_ep_config_lane_is_equal(ep_config_key,
+                                        another_ep_config_key,
+                                        lane, 0)) {
+            return another_lane;
+        }
+    }
+
+    return UCP_NULL_LANE;
+}
+
+ucp_lane_index_t ucp_wireup_ep_lane_used_by_another_ep(ucp_ep_h ep,
+                                                       ucp_ep_h another_ep,
+                                                       ucp_lane_index_t lane)
+{
+    return ucp_wireup_ep_lane_used_by_another_ep_config(
+                       &ucp_ep_config(ep)->key,
+                       &ucp_ep_config(another_ep)->key,
+                       lane);
+}
+
 ucs_status_t
 ucp_wireup_connect_local(ucp_ep_h ep,
                          const ucp_unpacked_address_t *remote_address,

src/ucp/wireup/wireup.h

@@ -145,6 +145,10 @@ void ucp_wireup_remote_connected(ucp_ep_h ep);
 unsigned ucp_ep_init_flags(const ucp_worker_h worker,
                            const ucp_ep_params_t *params);
 
+ucp_lane_index_t ucp_wireup_ep_lane_used_by_another_ep(ucp_ep_h ep,
+                                                       ucp_ep_h another_ep,
+                                                       ucp_lane_index_t lane);
+
 ucs_status_t
 ucp_wireup_connect_local(ucp_ep_h ep,
                          const ucp_unpacked_address_t *remote_address,

src/ucp/wireup/wireup_ep.c

@@ -43,17 +43,125 @@ ucp_wireup_ep_connect_to_ep(uct_ep_h uct_ep, const uct_device_addr_t *dev_addr,
     return uct_ep_connect_to_ep(wireup_ep->super.uct_ep, dev_addr, ep_addr);
 }
 
+static void
+ucp_wireup_tmp_ep_destroy_complete_cb(void *request, ucs_status_t status,
+                                      void *user_data)
+{
+    ucp_wireup_ep_t *wireup_ep = (ucp_wireup_ep_t*)user_data;
+
+    if (wireup_ep == NULL) {
+        /* check for NULL pointer to workaround Coverity warning (it wrongly
+         * assumes that this callback could be called upon GET/PUT operation) */
+        ucs_fatal("req=%p: user_data passed to the TMP EP destroy cb is NULL",
+                  (ucp_request_t*)req - 1);
+    }
+
+    wireup_ep->flags &= ~UCP_WIREUP_EP_FLAG_DESTROY_TMP_EP;
+    ucs_assert(wireup_ep->tmp_ep == NULL);
+    ucp_request_release(request);
+}
+
+static unsigned ucp_wireup_tmp_ep_disconnect_progress(void *arg)
+{
+    ucp_request_t *req         = (ucp_request_t*)arg;
+    ucp_ep_h tmp_ep            = req->send.ep;
+    ucp_worker_h worker        = tmp_ep->worker;
+    ucs_async_context_t *async = &worker->async;
+
+    UCS_ASYNC_BLOCK(async);
+    ucp_ep_disconnected(tmp_ep, 1);
+    --worker->flush_ops_count;
+    ucp_request_complete_send(req, req->status);
+    UCS_ASYNC_UNBLOCK(async);
+
+    return 1;
+}
+
+static void ucp_wireup_tmp_ep_flushed_cb(ucp_request_t *req)
+{
+    uct_worker_cb_id_t cb_id = UCS_CALLBACKQ_ID_NULL;
+    ucp_ep_h tmp_ep          = req->send.ep;
+
+    uct_worker_progress_register_safe(tmp_ep->worker->uct,
+                                      ucp_wireup_tmp_ep_disconnect_progress,
+                                      req, UCS_CALLBACKQ_FLAG_ONESHOT, &cb_id);
+}
+
+/* the following values could be returned from the function:
+ * - true:  destroying of the TMP EP was completed inplace, if the complete_cb
+ *          was specified, it wouldn't be called
+ * - false: destroying of the TMP EP is in progress now, if the complete_cb
+ *          was specified, it would be called upon completion the destroying
+ *          of the TMP EP */
+int ucp_wireup_tmp_ep_destroy(ucp_ep_h ep, ucp_wireup_ep_t *wireup_ep,
+                              unsigned ep_flush_flags,
+                              ucp_send_nbx_callback_t complete_cb)
+{
+    ucp_ep_h tmp_ep           = wireup_ep->tmp_ep;
+    ucp_worker_h worker       = tmp_ep->worker;
+    ucp_request_param_t param = ucp_request_null_param;
+    ucp_lane_index_t lane, found_lane;
+    uct_ep_h uct_ep;
+    void *req;
+
+    ucs_assert(tmp_ep != ep);
+
+    /* to prevent flush+destroy UCT EPs that are used by the main EP,
+     * they have to be remove from the TMP EP lanes and their WIREUP
+     * EPs have to be destroyed */
+    for (lane = 0; lane < ucp_ep_num_lanes(tmp_ep); ++lane) {
+        if (tmp_ep->uct_eps[lane] != NULL) {
+            found_lane = ucp_wireup_ep_lane_used_by_another_ep(tmp_ep, ep, lane);
+            if (found_lane != UCP_NULL_LANE) {
+                uct_ep = tmp_ep->uct_eps[lane];
+                ucs_assert(ucp_wireup_ep_test(uct_ep) &&
+                           !ucp_wireup_ep(uct_ep)->super.is_owner);
+
+                ucs_debug("ep %p: destroy uct_ep[%d]=%p", ep, lane, uct_ep);
+                uct_ep_destroy(uct_ep);
+                tmp_ep->uct_eps[lane] = NULL;
+            }
+        }
+    }
+
+    if (complete_cb != NULL) {
+        param.op_attr_mask |= UCP_OP_ATTR_FIELD_CALLBACK |
+                              UCP_OP_ATTR_FIELD_USER_DATA;
+        param.cb.send       = complete_cb;
+        param.user_data     = wireup_ep;
+    }
+
+    wireup_ep->tmp_ep = NULL;
+
+    req = ucp_ep_flush_internal(tmp_ep, ep_flush_flags, 0, &param, NULL,
+                                ucp_wireup_tmp_ep_flushed_cb,
+                                "tmp_ep_flushed_cb");
+    if (req != NULL) {
+        if (!UCS_PTR_IS_ERR(req)) {
+            ++worker->flush_ops_count;
+            return 0;
+        }
+
+        ucs_error("ucp_ep_flush_internal() completed with error: %s",
+                  ucs_status_string(UCS_PTR_STATUS(req)));
+    }
+
+    ucp_ep_disconnected(tmp_ep, 1);
+    return 1;
+}
+
 /*
  * We switch the endpoint in this function (instead in wireup code) since
  * this is guaranteed to run from the main thread.
  */
 static unsigned ucp_wireup_ep_progress(void *arg)
 {
     ucp_wireup_ep_t *wireup_ep = arg;
-    ucp_ep_h ucp_ep = wireup_ep->super.ucp_ep;
+    ucp_ep_h ucp_ep            = wireup_ep->super.ucp_ep;
     ucs_queue_head_t tmp_pending_queue;
     uct_pending_req_t *uct_req;
     ucp_request_t *req;
+    int ret;
 
     UCS_ASYNC_BLOCK(&ucp_ep->worker->async);
 
@@ -75,6 +183,18 @@ static unsigned ucp_wireup_ep_progress(void *arg)
         goto out_unblock;
     }
 
+    if (wireup_ep->tmp_ep != NULL) {
+        ret = ucp_wireup_tmp_ep_destroy(ucp_ep, wireup_ep, UCT_FLUSH_FLAG_LOCAL,
+                                        ucp_wireup_tmp_ep_destroy_complete_cb);
+        if (!ret) {
+            wireup_ep->flags |= UCP_WIREUP_EP_FLAG_DESTROY_TMP_EP;
+            goto out_unblock;
+        }
+    } else if (wireup_ep->flags & UCP_WIREUP_EP_FLAG_DESTROY_TMP_EP) {
+        /* destroying of TMP EP is in progress, return from the function */
+        goto out_unblock;
+    }
+
     ucs_trace("ep %p: switching wireup_ep %p to ready state", ucp_ep, wireup_ep);
 
     /* Move wireup pending queue to temporary queue and remove references to
@@ -386,12 +506,12 @@ static UCS_CLASS_CLEANUP_FUNC(ucp_wireup_ep_t)
         uct_ep_destroy(self->sockaddr_ep);
     }
 
+    UCS_ASYNC_BLOCK(&worker->async);
     if (self->tmp_ep != NULL) {
         ucs_assert(!(self->tmp_ep->flags & UCP_EP_FLAG_USED));
-        ucp_ep_disconnected(self->tmp_ep, 1);
+        ucp_wireup_tmp_ep_destroy(ucp_ep, self, UCT_FLUSH_FLAG_CANCEL, NULL);
     }
 
-    UCS_ASYNC_BLOCK(&worker->async);
     --worker->flush_ops_count;
     UCS_ASYNC_UNBLOCK(&worker->async);
 }

src/ucp/wireup/wireup_ep.h

@@ -21,6 +21,7 @@
 enum {
     UCP_WIREUP_EP_FLAG_READY           = UCS_BIT(0), /**< next_ep is fully connected */
     UCP_WIREUP_EP_FLAG_LOCAL_CONNECTED = UCS_BIT(1), /**< Debug: next_ep connected to remote */
+    UCP_WIREUP_EP_FLAG_DESTROY_TMP_EP  = UCS_BIT(2)  /**< wireup ep is in progress to destroy TMP EP */
 };