From 2b5fed8696ce2a9b67e63cf5b5dbf49505172c9a Mon Sep 17 00:00:00 2001 From: Florin Coras Date: Thu, 25 Jul 2019 14:51:09 -0700 Subject: session: fix vpp to app msg generation Type:fix Freeing mq messages in vpp (producer), if enqueueing fails, invalidates consumer assumption that messages can be freed without a lock. Change-Id: I748a33b8846597bdad865945d8e899346d482434 Signed-off-by: Florin Coras Signed-off-by: Tal Saiag --- src/vnet/session/application_worker.c | 85 +++++++++++------------------------ src/vnet/session/session_node.c | 9 ++-- 2 files changed, 28 insertions(+), 66 deletions(-) (limited to 'src/vnet/session') diff --git a/src/vnet/session/application_worker.c b/src/vnet/session/application_worker.c index cab96b5f391..0be1a2e85f7 100644 --- a/src/vnet/session/application_worker.c +++ b/src/vnet/session/application_worker.c @@ -535,34 +535,7 @@ app_worker_application_is_builtin (app_worker_t * app_wrk) } static inline int -app_enqueue_evt (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, u8 lock) -{ - if (PREDICT_FALSE (svm_msg_q_is_full (mq))) - { - clib_warning ("evt q full"); - svm_msg_q_free_msg (mq, msg); - if (lock) - svm_msg_q_unlock (mq); - return -1; - } - - if (lock) - { - svm_msg_q_add_and_unlock (mq, msg); - return 0; - } - - /* Even when not locking the ring, we must wait for queue mutex */ - if (svm_msg_q_add (mq, msg, SVM_Q_WAIT)) - { - clib_warning ("msg q add returned"); - return -1; - } - return 0; -} - -static inline int -app_send_io_evt_rx (app_worker_t * app_wrk, session_t * s, u8 lock) +app_send_io_evt_rx (app_worker_t * app_wrk, session_t * s) { session_event_t *evt; svm_msg_q_msg_t msg; @@ -579,33 +552,35 @@ app_send_io_evt_rx (app_worker_t * app_wrk, session_t * s, u8 lock) return 0; mq = app_wrk->event_queue; - if (lock) - svm_msg_q_lock (mq); + svm_msg_q_lock (mq); + + if (PREDICT_FALSE (svm_msg_q_is_full (mq))) + { + clib_warning ("evt q full"); + svm_msg_q_unlock (mq); + return -1; + } if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING))) { clib_warning ("evt q rings full"); - if (lock) - svm_msg_q_unlock (mq); + svm_msg_q_unlock (mq); return -1; } msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING); - ASSERT (!svm_msg_q_msg_is_invalid (&msg)); - evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg); evt->session_index = s->rx_fifo->client_session_index; evt->event_type = SESSION_IO_EVT_RX; (void) svm_fifo_set_event (s->rx_fifo); + svm_msg_q_add_and_unlock (mq, &msg); - if (app_enqueue_evt (mq, &msg, lock)) - return -1; return 0; } static inline int -app_send_io_evt_tx (app_worker_t * app_wrk, session_t * s, u8 lock) +app_send_io_evt_tx (app_worker_t * app_wrk, session_t * s) { svm_msg_q_t *mq; session_event_t *evt; @@ -615,50 +590,40 @@ app_send_io_evt_tx (app_worker_t * app_wrk, session_t * s, u8 lock) return app_worker_builtin_tx (app_wrk, s); mq = app_wrk->event_queue; - if (lock) - svm_msg_q_lock (mq); + svm_msg_q_lock (mq); + + if (PREDICT_FALSE (svm_msg_q_is_full (mq))) + { + clib_warning ("evt q full"); + svm_msg_q_unlock (mq); + return -1; + } if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING))) { clib_warning ("evt q rings full"); - if (lock) - svm_msg_q_unlock (mq); + svm_msg_q_unlock (mq); return -1; } msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING); - ASSERT (!svm_msg_q_msg_is_invalid (&msg)); - evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg); evt->event_type = SESSION_IO_EVT_TX; evt->session_index = s->tx_fifo->client_session_index; - return app_enqueue_evt (mq, &msg, lock); + svm_msg_q_add_and_unlock (mq, &msg); + return 0; } /* *INDENT-OFF* */ typedef int (app_send_evt_handler_fn) (app_worker_t *app, - session_t *s, - u8 lock); + session_t *s); static app_send_evt_handler_fn * const app_send_evt_handler_fns[2] = { app_send_io_evt_rx, app_send_io_evt_tx, }; /* *INDENT-ON* */ -/** - * Send event to application - * - * Logic from queue perspective is non-blocking. If there's - * not enough space to enqueue a message, we return. - */ -int -app_worker_send_event (app_worker_t * app, session_t * s, u8 evt_type) -{ - ASSERT (app && evt_type <= SESSION_IO_EVT_TX); - return app_send_evt_handler_fns[evt_type] (app, s, 0 /* lock */ ); -} - /** * Send event to application * @@ -669,7 +634,7 @@ int app_worker_lock_and_send_event (app_worker_t * app, session_t * s, u8 evt_type) { - return app_send_evt_handler_fns[evt_type] (app, s, 1 /* lock */ ); + return app_send_evt_handler_fns[evt_type] (app, s); } u8 * diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c index 35704b75a0a..bffae62ff79 100644 --- a/src/vnet/session/session_node.c +++ b/src/vnet/session/session_node.c @@ -175,7 +175,6 @@ session_mq_disconnected_handler (void *data) svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); - svm_msg_q_unlock (app_wrk->event_queue); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_DISCONNECTED_REPLY; @@ -183,7 +182,7 @@ session_mq_disconnected_handler (void *data) rmp->handle = mp->handle; rmp->context = mp->context; rmp->retval = rv; - svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT); + svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); } static void @@ -250,13 +249,12 @@ session_mq_worker_update_handler (void *data) svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); - svm_msg_q_unlock (app_wrk->event_queue); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_REQ_WORKER_UPDATE; wump = (session_req_worker_update_msg_t *) evt->data; wump->session_handle = mp->handle; - svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT); + svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); return; } @@ -268,7 +266,6 @@ session_mq_worker_update_handler (void *data) svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); - svm_msg_q_unlock (app_wrk->event_queue); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_WORKER_UPDATE_REPLY; @@ -277,7 +274,7 @@ session_mq_worker_update_handler (void *data) rmp->rx_fifo = pointer_to_uword (s->rx_fifo); rmp->tx_fifo = pointer_to_uword (s->tx_fifo); rmp->segment_handle = session_segment_handle (s); - svm_msg_q_add (app_wrk->event_queue, msg, SVM_Q_WAIT); + svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); /* * Retransmit messages that may have been lost -- cgit 1.2.3-korg