/* * Copyright (c) 2017-2019 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include #include #include #include static inline void session_wrk_send_evt_to_main (session_worker_t *wrk, session_evt_elt_t *elt) { session_evt_elt_t *he; uword thread_index; u8 is_empty; thread_index = wrk->vm->thread_index; he = clib_llist_elt (wrk->event_elts, wrk->evts_pending_main); is_empty = clib_llist_is_empty (wrk->event_elts, evt_list, he); clib_llist_add_tail (wrk->event_elts, evt_list, elt, he); if (is_empty) session_send_rpc_evt_to_thread (0, session_wrk_handle_evts_main_rpc, uword_to_pointer (thread_index, void *)); } #define app_check_thread_and_barrier(_wrk, _elt) \ if (!vlib_thread_is_main_w_barrier ()) \ { \ session_wrk_send_evt_to_main (wrk, elt); \ return; \ } static void session_wrk_timerfd_update (session_worker_t *wrk, u64 time_ns) { struct itimerspec its; its.it_value.tv_sec = 0; its.it_value.tv_nsec = time_ns; its.it_interval.tv_sec = 0; its.it_interval.tv_nsec = its.it_value.tv_nsec; if (timerfd_settime (wrk->timerfd, 0, &its, NULL) == -1) clib_warning ("timerfd_settime"); } always_inline u64 session_wrk_tfd_timeout (session_wrk_state_t state, u32 thread_index) { if (state == SESSION_WRK_INTERRUPT) return thread_index ? 1e6 : vlib_num_workers () ? 5e8 : 1e6; else if (state == SESSION_WRK_IDLE) return thread_index ? 1e8 : vlib_num_workers () ? 5e8 : 1e8; else return 0; } static inline void session_wrk_set_state (session_worker_t *wrk, session_wrk_state_t state) { u64 time_ns; wrk->state = state; if (wrk->timerfd == -1) return; time_ns = session_wrk_tfd_timeout (state, wrk->vm->thread_index); session_wrk_timerfd_update (wrk, time_ns); } static transport_endpt_ext_cfg_t * session_mq_get_ext_config (application_t *app, uword offset) { svm_fifo_chunk_t *c; fifo_segment_t *fs; fs = application_get_rx_mqs_segment (app); c = fs_chunk_ptr (fs->h, offset); return (transport_endpt_ext_cfg_t *) c->data; } static void session_mq_free_ext_config (application_t *app, uword offset) { svm_fifo_chunk_t *c; fifo_segment_t *fs; fs = application_get_rx_mqs_segment (app); c = fs_chunk_ptr (fs->h, offset); fifo_segment_collect_chunk (fs, 0 /* only one slice */, c); } static void session_mq_listen_handler (session_worker_t *wrk, session_evt_elt_t *elt) { vnet_listen_args_t _a, *a = &_a; session_listen_msg_t *mp; app_worker_t *app_wrk; application_t *app; int rv; app_check_thread_and_barrier (wrk, elt); mp = session_evt_ctrl_data (wrk, elt); app = application_lookup (mp->client_index); if (!app) return; clib_memset (a, 0, sizeof (*a)); a->sep.is_ip4 = mp->is_ip4; ip_copy (&a->sep.ip, &mp->ip, mp->is_ip4); a->sep.port = mp->port; a->sep.fib_index = mp->vrf; a->sep.sw_if_index = ENDPOINT_INVALID_INDEX; a->sep.transport_proto = mp->proto; a->app_index = app->app_index; a->wrk_map_index = mp->wrk_index; a->sep_ext.transport_flags = mp->flags; if (mp->ext_config) a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config); if ((rv = vnet_listen (a))) session_worker_stat_error_inc (wrk, rv, 1); app_wrk = application_get_worker (app, mp->wrk_index); app_worker_listened_notify (app_wrk, a->handle, mp->context, rv); if (mp->ext_config) session_mq_free_ext_config (app, mp->ext_config); /* Make sure events are flushed before releasing barrier, to avoid * potential race with accept. */ app_wrk_flush_wrk_events (app_wrk, 0); } static void session_mq_listen_uri_handler (session_worker_t *wrk, session_evt_elt_t *elt) { vnet_listen_args_t _a, *a = &_a; session_listen_uri_msg_t *mp; app_worker_t *app_wrk; application_t *app; int rv; app_check_thread_and_barrier (wrk, elt); mp = session_evt_ctrl_data (wrk, elt); app = application_lookup (mp->client_index); if (!app) return; clib_memset (a, 0, sizeof (*a)); a->uri = (char *) mp->uri; a->app_index = app->app_index; rv = vnet_bind_uri (a); app_wrk = application_get_worker (app, 0); app_worker_listened_notify (app_wrk, a->handle, mp->context, rv); app_wrk_flush_wrk_events (app_wrk, 0); } static void session_mq_connect_one (session_connect_msg_t *mp) { vnet_connect_args_t _a, *a = &_a; app_worker_t *app_wrk; session_worker_t *wrk; application_t *app; int rv; app = application_lookup (mp->client_index); if (!app) return; clib_memset (a, 0, sizeof (*a)); a->sep.is_ip4 = mp->is_ip4; clib_memcpy_fast (&a->sep.ip, &mp->ip, sizeof (mp->ip)); a->sep.port = mp->port; a->sep.transport_proto = mp->proto; a->sep.peer.fib_index = mp->vrf; a->sep.dscp = mp->dscp; clib_memcpy_fast (&a->sep.peer.ip, &mp->lcl_ip, sizeof (mp->lcl_ip)); if (mp->is_ip4) { ip46_address_mask_ip4 (&a->sep.ip); ip46_address_mask_ip4 (&a->sep.peer.ip); } a->sep.peer.port = mp->lcl_port; a->sep.peer.sw_if_index = ENDPOINT_INVALID_INDEX; a->sep_ext.parent_handle = mp->parent_handle; a->sep_ext.transport_flags = mp->flags; a->api_context = mp->context; a->app_index = app->app_index; a->wrk_map_index = mp->wrk_index; if (mp->ext_config) a->sep_ext.ext_cfg = session_mq_get_ext_config (app, mp->ext_config); if ((rv = vnet_connect (a))) { wrk = session_main_get_worker (vlib_get_thread_index ()); session_worker_stat_error_inc (wrk, rv, 1); app_wrk = application_get_worker (app, mp->wrk_index); app_worker_connect_notify (app_wrk, 0, rv, mp->context); } if (mp->ext_config) session_mq_free_ext_config (app, mp->ext_config); } static void session_mq_handle_connects_rpc (void *arg) { u32 max_connects = 32, n_connects = 0; session_evt_elt_t *he, *elt, *next; session_worker_t *fwrk; ASSERT (session_vlib_thread_is_cl_thread ()); /* Pending connects on linked list pertaining to first worker */ fwrk = session_main_get_worker (transport_cl_thread ()); if (!fwrk->n_pending_connects) return; he = clib_llist_elt (fwrk->event_elts, fwrk->pending_connects); elt = clib_llist_next (fwrk->event_elts, evt_list, he); /* Avoid holding the worker for too long */ while (n_connects < max_connects && elt != he) { next = clib_llist_next (fwrk->event_elts, evt_list, elt); clib_llist_remove (fwrk->event_elts, evt_list, elt); session_mq_connect_one (session_evt_ctrl_data (fwrk, elt)); session_evt_ctrl_data_free (fwrk, elt); clib_llist_put (fwrk->event_elts, elt); elt = next; n_connects += 1; } /* Decrement with worker barrier */ fwrk->n_pending_connects -= n_connects; if (fwrk->n_pending_connects > 0) { session_send_rpc_evt_to_thread_force (fwrk->vm->thread_index, session_mq_handle_connects_rpc, 0); } } static void session_mq_connect_handler (session_worker_t *wrk, session_evt_elt_t *elt) { u32 thread_index = wrk - session_main.wrk; session_evt_elt_t *he; if (PREDICT_FALSE (thread_index > transport_cl_thread ())) { clib_warning ("Connect on wrong thread. Dropping"); return; } /* If on worker, check if main has any pending messages. Avoids reordering * with other control messages that need to be handled by main */ if (thread_index) { he = clib_llist_elt (wrk->event_elts, wrk->evts_pending_main); /* Events pending on main, postpone to avoid reordering */ if (!clib_llist_is_empty (wrk->event_elts, evt_list, he)) { clib_llist_add_tail (wrk->event_elts, evt_list, elt, he); return; } } /* Add to pending list to be handled by first worker */ he = clib_llist_elt (wrk->event_elts, wrk->pending_connects); clib_llist_add_tail (wrk->event_elts, evt_list, elt, he); /* Decremented with worker barrier */ wrk->n_pending_connects += 1; if (wrk->n_pending_connects == 1) { session_send_rpc_evt_to_thread_force (thread_index, session_mq_handle_connects_rpc, 0); } } static void session_mq_connect_uri_handler (session_worker_t *wrk, session_evt_elt_t *elt) { vnet_connect_args_t _a, *a = &_a; session_connect_uri_msg_t *mp; app_worker_t *app_wrk; application_t *app; int rv; app_check_thread_and_barrier (wrk, elt); mp = session_evt_ctrl_data (wrk, elt); app = application_lookup (mp->client_index); if (!app) return; clib_memset (a, 0, sizeof (*a)); a->uri = (char *) mp->uri; a->api_context = mp->context; a->app_index = app->app_index; if ((rv = vnet_connect_uri (a))) { session_worker_stat_error_inc (wrk, rv, 1); app_wrk = application_get_worker (app, 0 /* default wrk only */ ); app_worker_connect_notify (app_wrk, 0, rv, mp->context); } } static void session_mq_shutdown_handler (void *data) { session_shutdown_msg_t *mp = (session_shutdown_msg_t *) data; vnet_shutdown_args_t _a, *a = &_a; application_t *app; app = application_lookup (mp->client_index); if (!app) return; a->app_index = app->app_index; a->handle = mp->handle; vnet_shutdown_session (a); } static void session_mq_disconnect_handler (void *data) { session_disconnect_msg_t *mp = (session_disconnect_msg_t *) data; vnet_disconnect_args_t _a, *a = &_a; application_t *app; app = application_lookup (mp->client_index); if (!app) return; a->app_index = app->app_index; a->handle = mp->handle; vnet_disconnect_session (a); } static void app_mq_detach_handler (session_worker_t *wrk, session_evt_elt_t *elt) { vnet_app_detach_args_t _a, *a = &_a; session_app_detach_msg_t *mp; application_t *app; app_check_thread_and_barrier (wrk, elt); mp = session_evt_ctrl_data (wrk, elt); app = application_lookup (mp->client_index); if (!app) return; a->app_index = app->app_index; a->api_client_index = mp->client_index; vnet_application_detach (a); } static void session_mq_unlisten_handler (session_worker_t *wrk, session_evt_elt_t *elt) { vnet_unlisten_args_t _a, *a = &_a; session_unlisten_msg_t *mp; app_worker_t *app_wrk; session_handle_t sh; application_t *app; int rv; app_check_thread_and_barrier (wrk, elt); mp = session_evt_ctrl_data (wrk, elt); sh = mp->handle; app = application_lookup (mp->client_index); if (!app) return; clib_memset (a, 0, sizeof (*a)); a->app_index = app->app_index; a->handle = sh; a->wrk_map_index = mp->wrk_index; if ((rv = vnet_unlisten (a))) session_worker_stat_error_inc (wrk, rv, 1); app_wrk = application_get_worker (app, a->wrk_map_index); if (!app_wrk) return; app_worker_unlisten_reply (app_wrk, sh, mp->context, rv); } static void session_mq_accepted_reply_handler (session_worker_t *wrk, session_evt_elt_t *elt) { vnet_disconnect_args_t _a = { 0 }, *a = &_a; session_accepted_reply_msg_t *mp; session_state_t old_state; app_worker_t *app_wrk; session_t *s; mp = session_evt_ctrl_data (wrk, elt); /* Mail this back from the main thread. We're not polling in main * thread so we're using other workers for notifications. */ if (session_thread_from_handle (mp->handle) == 0 && vlib_num_workers () && vlib_get_thread_index () != 0) { session_wrk_send_evt_to_main (wrk, elt); return; } s = session_get_from_handle_if_valid (mp->handle); if (!s) return; app_wrk = app_worker_get (s->app_wrk_index); if (app_wrk->app_index != mp->context) { clib_warning ("app doesn't own session"); return; } /* Server isn't interested, disconnect the session */ if (mp->retval) { a->app_index = mp->context; a->handle = mp->handle; vnet_disconnect_session (a); s->app_wrk_index = SESSION_INVALID_INDEX; return; } /* Special handling for cut-through sessions */ if (!session_has_transport (s)) { session_set_state (s, SESSION_STATE_READY); ct_session_connect_notify (s, SESSION_E_NONE); return; } old_state = s->session_state; session_set_state (s, SESSION_STATE_READY); if (!svm_fifo_is_empty_prod (s->rx_fifo)) app_worker_rx_notify (app_wrk, s); /* Closed while waiting for app to reply. Resend disconnect */ if (old_state >= SESSION_STATE_TRANSPORT_CLOSING) { app_worker_close_notify (app_wrk, s); session_set_state (s, old_state); return; } } static void session_mq_reset_reply_handler (void *data) { vnet_disconnect_args_t _a = { 0 }, *a = &_a; session_reset_reply_msg_t *mp; app_worker_t *app_wrk; session_t *s; application_t *app; mp = (session_reset_reply_msg_t *) data; app = application_lookup (mp->context); if (!app) return; s = session_get_from_handle_if_valid (mp->handle); /* No session or not the right session */ if (!s || s->session_state < SESSION_STATE_TRANSPORT_CLOSING) return; app_wrk = app_worker_get (s->app_wrk_index); if (!app_wrk || app_wrk->app_index != app->app_index) { clib_warning ("App %u does not own handle 0x%lx!", app->app_index, mp->handle); return; } /* Client objected to resetting the session, log and continue */ if (mp->retval) { clib_warning ("client retval %d", mp->retval); return; } /* This comes as a response to a reset, transport only waiting for * confirmation to remove connection state, no need to disconnect */ a->handle = mp->handle; a->app_index = app->app_index; vnet_disconnect_session (a); } static void session_mq_disconnected_handler (void *data) { session_disconnected_reply_msg_t *rmp; vnet_disconnect_args_t _a, *a = &_a; svm_msg_q_msg_t _msg, *msg = &_msg; session_disconnected_msg_t *mp; app_worker_t *app_wrk; session_event_t *evt; session_t *s; application_t *app; int rv = 0; mp = (session_disconnected_msg_t *) data; if (!(s = session_get_from_handle_if_valid (mp->handle))) { clib_warning ("could not disconnect handle %llu", mp->handle); return; } app_wrk = app_worker_get (s->app_wrk_index); app = application_lookup (mp->client_index); if (!(app_wrk && app && app->app_index == app_wrk->app_index)) { clib_warning ("could not disconnect session: %llu app: %u", mp->handle, mp->client_index); return; } a->handle = mp->handle; a->app_index = app_wrk->wrk_index; rv = vnet_disconnect_session (a); svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); 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; rmp = (session_disconnected_reply_msg_t *) evt->data; rmp->handle = mp->handle; rmp->context = mp->context; rmp->retval = rv; svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); } static void session_mq_disconnected_reply_handler (void *data) { session_disconnected_reply_msg_t *mp; vnet_disconnect_args_t _a, *a = &_a; application_t *app; mp = (session_disconnected_reply_msg_t *) data; /* Client objected to disconnecting the session, log and continue */ if (mp->retval) { clib_warning ("client retval %d", mp->retval); return; } /* Disconnect has been confirmed. Confirm close to transport */ app = application_lookup (mp->context); if (app) { a->handle = mp->handle; a->app_index = app->app_index; vnet_disconnect_session (a); } } static void session_mq_worker_update_handler (void *data) { session_worker_update_msg_t *mp = (session_worker_update_msg_t *) data; session_worker_update_reply_msg_t *rmp; svm_msg_q_msg_t _msg, *msg = &_msg; app_worker_t *app_wrk; u32 owner_app_wrk_map; session_event_t *evt; session_t *s; application_t *app; int rv; app = application_lookup (mp->client_index); if (!app) return; if (!(s = session_get_from_handle_if_valid (mp->handle))) { clib_warning ("invalid handle %llu", mp->handle); return; } app_wrk = app_worker_get (s->app_wrk_index); if (app_wrk->app_index != app->app_index) { clib_warning ("app %u does not own session %llu", app->app_index, mp->handle); return; } owner_app_wrk_map = app_wrk->wrk_map_index; app_wrk = application_get_worker (app, mp->wrk_index); /* This needs to come from the new owner */ if (mp->req_wrk_index == owner_app_wrk_map) { session_req_worker_update_msg_t *wump; svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); 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_and_unlock (app_wrk->event_queue, msg); return; } rv = app_worker_own_session (app_wrk, s); if (rv) session_stat_error_inc (rv, 1); /* * Send reply */ svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); 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; rmp = (session_worker_update_reply_msg_t *) evt->data; rmp->handle = mp->handle; if (s->rx_fifo) rmp->rx_fifo = fifo_segment_fifo_offset (s->rx_fifo); if (s->tx_fifo) rmp->tx_fifo = fifo_segment_fifo_offset (s->tx_fifo); rmp->segment_handle = session_segment_handle (s); svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); /* * Retransmit messages that may have been lost */ if (s->tx_fifo && !svm_fifo_is_empty (s->tx_fifo)) session_send_io_evt_to_thread (s->tx_fifo, SESSION_IO_EVT_TX); if (s->rx_fifo && !svm_fifo_is_empty (s->rx_fifo)) app_worker_rx_notify (app_wrk, s); if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSING) app_worker_close_notify (app_wrk, s); } static void session_mq_app_wrk_rpc_handler (void *data) { session_app_wrk_rpc_msg_t *mp = (session_app_wrk_rpc_msg_t *) data; svm_msg_q_msg_t _msg, *msg = &_msg; session_app_wrk_rpc_msg_t *rmp; app_worker_t *app_wrk; session_event_t *evt; application_t *app; app = application_lookup (mp->client_index); if (!app) return; app_wrk = application_get_worker (app, mp->wrk_index); svm_msg_q_lock_and_alloc_msg_w_ring (app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_APP_WRK_RPC; rmp = (session_app_wrk_rpc_msg_t *) evt->data; clib_memcpy (rmp->data, mp->data, sizeof (mp->data)); svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); } static void session_mq_transport_attr_handler (void *data) { session_transport_attr_msg_t *mp = (session_transport_attr_msg_t *) data; session_transport_attr_reply_msg_t *rmp; svm_msg_q_msg_t _msg, *msg = &_msg; app_worker_t *app_wrk; session_event_t *evt; application_t *app; session_t *s; int rv; app = application_lookup (mp->client_index); if (!app) return; if (!(s = session_get_from_handle_if_valid (mp->handle))) { clib_warning ("invalid handle %llu", mp->handle); return; } app_wrk = app_worker_get (s->app_wrk_index); if (app_wrk->app_index != app->app_index) { clib_warning ("app %u does not own session %llu", app->app_index, mp->handle); return; } rv = session_transport_attribute (s, mp->is_get, &mp->attr); svm_msg_q_lock_and_alloc_msg_w_ring ( app_wrk->event_queue, SESSION_MQ_CTRL_EVT_RING, SVM_Q_WAIT, msg); evt = svm_msg_q_msg_data (app_wrk->event_queue, msg); clib_memset (evt, 0, sizeof (*evt)); evt->event_type = SESSION_CTRL_EVT_TRANSPORT_ATTR_REPLY; rmp = (session_transport_attr_reply_msg_t *) evt->data; rmp->handle = mp->handle; rmp->retval = rv; rmp->is_get = mp->is_get; if (!rv && mp->is_get) rmp->attr = mp->attr; svm_msg_q_add_and_unlock (app_wrk->event_queue, msg); } void session_wrk_handle_evts_main_rpc (void *args) { vlib_main_t *vm = vlib_get_main (); clib_llist_index_t ei, next_ei; session_evt_elt_t *he, *elt; session_worker_t *fwrk; u32 thread_index; vlib_worker_thread_barrier_sync (vm); thread_index = pointer_to_uword (args); fwrk = session_main_get_worker (thread_index); he = clib_llist_elt (fwrk->event_elts, fwrk->evts_pending_main); ei = clib_llist_next_index (he, evt_list); while (ei != fwrk->evts_pending_main) { elt = clib_llist_elt (fwrk->event_elts, ei); next_ei = clib_llist_next_index (elt, evt_list); clib_llist_remove (fwrk->event_elts, evt_list, elt); switch (elt->evt.event_type) { case SESSION_CTRL_EVT_LISTEN: session_mq_listen_handler (fwrk, elt); break; case SESSION_CTRL_EVT_UNLISTEN: session_mq_unlisten_handler (fwrk, elt); break; case SESSION_CTRL_EVT_APP_DETACH: app_mq_detach_handler (fwrk, elt); break; case SESSION_CTRL_EVT_CONNECT_URI: session_mq_connect_uri_handler (fwrk, elt); break; case SESSION_CTRL_EVT_ACCEPTED_REPLY: session_mq_accepted_reply_handler (fwrk, elt); break; case SESSION_CTRL_EVT_CONNECT: session_mq_connect_handler (fwrk, elt); break; default: clib_warning ("unhandled %u", elt->evt.event_type); ALWAYS_ASSERT (0); break; } /* Regrab element in case pool moved */ elt = clib_llist_elt (fwrk->event_elts, ei); if (!clib_llist_elt_is_linked (elt, evt_list)) { session_evt_ctrl_data_free (fwrk, elt); clib_llist_put (fwrk->event_elts, elt); } ei = next_ei; } vlib_worker_thread_barrier_release (vm); } vlib_node_registration_t session_queue_node; typedef struct { u32 session_index; u32 server_thread_index; } session_queue_trace_t; /* packet trace format function */ static u8 * format_session_queue_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); session_queue_trace_t *t = va_arg (*args, session_queue_trace_t *); s = format (s, "session index %d thread index %d", t->session_index, t->server_thread_index); return s; } #define foreach_session_queue_error \ _ (TX, tx, INFO, "Packets transmitted") \ _ (TIMER, timer, INFO, "Timer events") \ _ (NO_BUFFER, no_buffer, ERROR, "Out of buffers") typedef enum { #define _(f, n, s, d) SESSION_QUEUE_ERROR_##f, foreach_session_queue_error #undef _ SESSION_QUEUE_N_ERROR, } session_queue_error_t; static vlib_error_desc_t session_error_counters[] = { #define _(f, n, s, d) { #n, d, VL_COUNTER_SEVERITY_##s }, foreach_session_queue_error #undef _ }; enum { SESSION_TX_NO_BUFFERS = -2, SESSION_TX_NO_DATA, SESSION_TX_OK }; static void session_tx_trace_frame (vlib_main_t *vm, vlib_node_runtime_t *node, u32 next_index, vlib_buffer_t **bufs, u16 n_segs, session_t *s, u32 n_trace) { vlib_buffer_t **b = bufs; while (n_trace && n_segs) { if (PREDICT_TRUE (vlib_trace_buffer (vm, node, next_index, b[0], 1 /* follow_chain */))) { session_queue_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); t->session_index = s->session_index; t->server_thread_index = s->thread_index; n_trace--; } b++; n_segs--; } vlib_set_trace_count (vm, node, n_trace); } always_inline int session_tx_fill_dma_transfers (session_worker_t *wrk, session_tx_context_t *ctx, vlib_buffer_t *b) { vlib_main_t *vm = wrk->vm; u32 len_to_deq; u8 *data0 = NULL; int n_bytes_read, len_write; svm_fifo_seg_t data_fs[2]; u32 n_segs = 2; u16 n_transfers = 0; /* * Start with the first buffer in chain */ b->error = 0; b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED; b->current_data = 0; data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf); n_bytes_read = svm_fifo_segments (ctx->s->tx_fifo, ctx->sp.tx_offset, data_fs, &n_segs, len_to_deq); len_write = n_bytes_read; ASSERT (n_bytes_read == len_to_deq); while (n_bytes_read) { wrk->batch_num++; vlib_dma_batch_add (vm, wrk->batch, data0, data_fs[n_transfers].data, data_fs[n_transfers].len); data0 += data_fs[n_transfers].len; n_bytes_read -= data_fs[n_transfers].len; n_transfers++; } return len_write; } always_inline int session_tx_fill_dma_transfers_tail (session_worker_t *wrk, session_tx_context_t *ctx, vlib_buffer_t *b, u32 len_to_deq, u8 *data) { vlib_main_t *vm = wrk->vm; int n_bytes_read, len_write; svm_fifo_seg_t data_fs[2]; u32 n_segs = 2; u16 n_transfers = 0; n_bytes_read = svm_fifo_segments (ctx->s->tx_fifo, ctx->sp.tx_offset, data_fs, &n_segs, len_to_deq); len_write = n_bytes_read; ASSERT (n_bytes_read == len_to_deq); while (n_bytes_read) { wrk->batch_num++; vlib_dma_batch_add (vm, wrk->batch, data, data_fs[n_transfers].data, data_fs[n_transfers].len); data += data_fs[n_transfers].len; n_bytes_read -= data_fs[n_transfers].len; n_transfers++; } return len_write; } always_inline int session_tx_copy_data (session_worker_t *wrk, session_tx_context_t *ctx, vlib_buffer_t *b, u32 len_to_deq, u8 *data0) { int n_bytes_read; if (PREDICT_TRUE (!wrk->dma_enabled)) n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset, len_to_deq, data0); else n_bytes_read = session_tx_fill_dma_transfers (wrk, ctx, b); return n_bytes_read; } always_inline int session_tx_copy_data_tail (session_worker_t *wrk, session_tx_context_t *ctx, vlib_buffer_t *b, u32 len_to_deq, u8 *data) { int n_bytes_read; if (PREDICT_TRUE (!wrk->dma_enabled)) n_bytes_read = svm_fifo_peek (ctx->s->tx_fifo, ctx->sp.tx_offset, len_to_deq, data); else n_bytes_read = session_tx_fill_dma_transfers_tail (wrk, ctx, b, len_to_deq, data); return n_bytes_read; } always_inline void session_tx_fifo_chain_tail (session_worker_t *wrk, session_tx_context_t *ctx, vlib_buffer_t *b, u16 *n_bufs, u8 peek_data) { vlib_main_t *vm = wrk->vm; vlib_buffer_t *chain_b, *prev_b; u32 chain_bi0, to_deq, left_from_seg; int len_to_deq, n_bytes_read; u8 *data, j; b->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID; b->total_length_not_including_first_buffer = 0; chain_b = b; left_from_seg = clib_min (ctx->sp.snd_mss - b->current_length, ctx->left_to_snd); to_deq = left_from_seg; for (j = 1; j < ctx->n_bufs_per_seg; j++) { prev_b = chain_b; len_to_deq = clib_min (to_deq, ctx->deq_per_buf); *n_bufs -= 1; chain_bi0 = ctx->tx_buffers[*n_bufs]; chain_b = vlib_get_buffer (vm, chain_bi0); chain_b->current_data = 0; data = vlib_buffer_get_current (chain_b); if (peek_data) { n_bytes_read = session_tx_copy_data_tail (wrk, ctx, b, len_to_deq, data); ctx->sp.tx_offset += n_bytes_read; } else { if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM) { svm_fifo_t *f = ctx->s->tx_fifo; session_dgram_hdr_t *hdr = &ctx->hdr; u16 deq_now; u32 offset; deq_now = clib_min (hdr->data_length - hdr->data_offset, len_to_deq); offset = hdr->data_offset + SESSION_CONN_HDR_LEN; n_bytes_read = svm_fifo_peek (f, offset, deq_now, data); ASSERT (n_bytes_read > 0); hdr->data_offset += n_bytes_read; if (hdr->data_offset == hdr->data_length) { offset = hdr->data_length + SESSION_CONN_HDR_LEN; svm_fifo_dequeue_drop (f, offset); if (ctx->left_to_snd > n_bytes_read) svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr), (u8 *) & ctx->hdr); } else if (ctx->left_to_snd == n_bytes_read) svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr, sizeof (session_dgram_pre_hdr_t)); } else n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo, len_to_deq, data); } ASSERT (n_bytes_read == len_to_deq); chain_b->current_length = n_bytes_read; b->total_length_not_including_first_buffer += chain_b->current_length; /* update previous buffer */ prev_b->next_buffer = chain_bi0; prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; /* update current buffer */ chain_b->next_buffer = 0; to_deq -= n_bytes_read; if (to_deq == 0) break; } ASSERT (to_deq == 0 && b->total_length_not_including_first_buffer == left_from_seg); ctx->left_to_snd -= left_from_seg; } always_inline void session_tx_fill_buffer (session_worker_t *wrk, session_tx_context_t *ctx, vlib_buffer_t *b, u16 *n_bufs, u8 peek_data) { u32 len_to_deq; u8 *data0; int n_bytes_read; /* * Start with the first buffer in chain */ b->error = 0; b->flags = VNET_BUFFER_F_LOCALLY_ORIGINATED; b->current_data = 0; data0 = vlib_buffer_make_headroom (b, TRANSPORT_MAX_HDRS_LEN); len_to_deq = clib_min (ctx->left_to_snd, ctx->deq_per_first_buf); if (peek_data) { n_bytes_read = session_tx_copy_data (wrk, ctx, b, len_to_deq, data0); ASSERT (n_bytes_read > 0); /* Keep track of progress locally, transport is also supposed to * increment it independently when pushing the header */ ctx->sp.tx_offset += n_bytes_read; } else { if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM) { session_dgram_hdr_t *hdr = &ctx->hdr; svm_fifo_t *f = ctx->s->tx_fifo; u16 deq_now; u32 offset; ASSERT (hdr->data_length > hdr->data_offset); deq_now = clib_min (hdr->data_length - hdr->data_offset, len_to_deq); offset = hdr->data_offset + SESSION_CONN_HDR_LEN; n_bytes_read = svm_fifo_peek (f, offset, deq_now, data0); ASSERT (n_bytes_read > 0); if (transport_connection_is_cless (ctx->tc)) { clib_memcpy_fast (data0 - sizeof (session_dgram_hdr_t), hdr, sizeof (*hdr)); } hdr->data_offset += n_bytes_read; if (hdr->data_offset == hdr->data_length) { offset = hdr->data_length + SESSION_CONN_HDR_LEN; svm_fifo_dequeue_drop (f, offset); if (ctx->left_to_snd > n_bytes_read) svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr), (u8 *) & ctx->hdr); } else if (ctx->left_to_snd == n_bytes_read) svm_fifo_overwrite_head (ctx->s->tx_fifo, (u8 *) & ctx->hdr, sizeof (session_dgram_pre_hdr_t)); } else { n_bytes_read = svm_fifo_dequeue (ctx->s->tx_fifo, len_to_deq, data0); ASSERT (n_bytes_read > 0); } } b->current_length = n_bytes_read; ctx->left_to_snd -= n_bytes_read; /* * Fill in the remaining buffers in the chain, if any */ if (PREDICT_FALSE (ctx->n_bufs_per_seg > 1 && ctx->left_to_snd)) session_tx_fifo_chain_tail (wrk, ctx, b, n_bufs, peek_data); } always_inline u8 session_tx_not_ready (session_t * s, u8 peek_data) { if (peek_data) { if (PREDICT_TRUE (s->session_state == SESSION_STATE_READY)) return 0; /* Can retransmit for closed sessions but can't send new data if * session is not ready or closed */ else if (s->session_state < SESSION_STATE_READY) { /* Allow accepting session to send custom packets. * For instance, tcp want to send acks in established, but * the app has not called accept() yet */ if (s->session_state == SESSION_STATE_ACCEPTING && (s->flags & SESSION_F_CUSTOM_TX)) return 0; return 1; } else if (s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) { /* Allow closed transports to still send custom packets. * For instance, tcp may want to send acks in time-wait. */ if (s->session_state != SESSION_STATE_TRANSPORT_DELETED && (s->flags & SESSION_F_CUSTOM_TX)) return 0; return 2; } } else { if (s->session_state == SESSION_STATE_TRANSPORT_DELETED) return 2; } return 0; } always_inline transport_connection_t * session_tx_get_transport (session_tx_context_t * ctx, u8 peek_data) { if (peek_data) { return ctx->transport_vft->get_connection (ctx->s->connection_index, ctx->s->thread_index); } else { if (ctx->s->session_state == SESSION_STATE_LISTENING) return ctx->transport_vft->get_listener (ctx->s->connection_index); else { return ctx->transport_vft->get_connection (ctx->s->connection_index, ctx->s->thread_index); } } } always_inline void session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx, u32 max_segs, u8 peek_data) { u32 n_bytes_per_buf, n_bytes_per_seg; n_bytes_per_buf = vlib_buffer_get_default_data_size (vm); ctx->max_dequeue = svm_fifo_max_dequeue_cons (ctx->s->tx_fifo); if (peek_data) { /* Offset in rx fifo from where to peek data */ if (PREDICT_FALSE (ctx->sp.tx_offset >= ctx->max_dequeue)) { ctx->max_len_to_snd = 0; return; } ctx->max_dequeue -= ctx->sp.tx_offset; } else { if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM) { u32 len, chain_limit; if (ctx->max_dequeue <= sizeof (ctx->hdr)) { ctx->max_len_to_snd = 0; return; } svm_fifo_peek (ctx->s->tx_fifo, 0, sizeof (ctx->hdr), (u8 *) & ctx->hdr); /* Zero length dgrams not supported */ if (PREDICT_FALSE (ctx->hdr.data_length == 0)) { svm_fifo_dequeue_drop (ctx->s->tx_fifo, sizeof (ctx->hdr)); ctx->max_len_to_snd = 0; return; } /* We cannot be sure apps have not enqueued incomplete dgrams */ if (PREDICT_FALSE (ctx->max_dequeue < ctx->hdr.data_length + sizeof (ctx->hdr))) { ctx->max_len_to_snd = 0; return; } ASSERT (ctx->hdr.data_length > ctx->hdr.data_offset); len = ctx->hdr.data_length - ctx->hdr.data_offset; if (ctx->hdr.gso_size) { ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, ctx->hdr.gso_size); } /* Process multiple dgrams if smaller than min (buf_space, mss). * This avoids handling multiple dgrams if they require buffer * chains */ chain_limit = clib_min (n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN, ctx->sp.snd_mss); if (ctx->hdr.data_length <= chain_limit) { u32 first_dgram_len, dgram_len, offset, max_offset; session_dgram_hdr_t hdr; ctx->sp.snd_mss = clib_min (ctx->sp.snd_mss, len); offset = ctx->hdr.data_length + sizeof (session_dgram_hdr_t); first_dgram_len = len; max_offset = clib_min (ctx->max_dequeue, 16 << 10); while (offset < max_offset) { svm_fifo_peek (ctx->s->tx_fifo, offset, sizeof (ctx->hdr), (u8 *) & hdr); dgram_len = hdr.data_length - hdr.data_offset; if (offset + sizeof (hdr) + hdr.data_length > ctx->max_dequeue || first_dgram_len != dgram_len) break; /* Assert here to allow test above with zero length dgrams */ ASSERT (hdr.data_length > hdr.data_offset); len += dgram_len; offset += sizeof (hdr) + hdr.data_length; } } ctx->max_dequeue = len; } } ASSERT (ctx->max_dequeue > 0); /* Ensure we're not writing more than transport window allows */ if (ctx->max_dequeue < ctx->sp.snd_space) { /* Constrained by tx queue. Try to send only fully formed segments */ ctx->max_len_to_snd = (ctx->max_dequeue > ctx->sp.snd_mss) ? (ctx->max_dequeue - (ctx->max_dequeue % ctx->sp.snd_mss)) : ctx->max_dequeue; /* TODO Nagle ? */ } else { /* Expectation is that snd_space0 is already a multiple of snd_mss */ ctx->max_len_to_snd = ctx->sp.snd_space; } /* Check if we're tx constrained by the node */ ctx->n_segs_per_evt = ceil ((f64) ctx->max_len_to_snd / ctx->sp.snd_mss); if (ctx->n_segs_per_evt > max_segs) { ctx->n_segs_per_evt = max_segs; ctx->max_len_to_snd = max_segs * ctx->sp.snd_mss; } ASSERT (n_bytes_per_buf > TRANSPORT_MAX_HDRS_LEN); if (ctx->n_segs_per_evt > 1) { u32 n_bytes_last_seg, n_bufs_last_seg; n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->sp.snd_mss; n_bytes_last_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd - ((ctx->n_segs_per_evt - 1) * ctx->sp.snd_mss); ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf); n_bufs_last_seg = ceil ((f64) n_bytes_last_seg / n_bytes_per_buf); ctx->n_bufs_needed = ((ctx->n_segs_per_evt - 1) * ctx->n_bufs_per_seg) + n_bufs_last_seg; } else { n_bytes_per_seg = TRANSPORT_MAX_HDRS_LEN + ctx->max_len_to_snd; ctx->n_bufs_per_seg = ceil ((f64) n_bytes_per_seg / n_bytes_per_buf); ctx->n_bufs_needed = ctx->n_bufs_per_seg; } ctx->deq_per_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf); ctx->deq_per_first_buf = clib_min (ctx->sp.snd_mss, n_bytes_per_buf - TRANSPORT_MAX_HDRS_LEN); } always_inline void session_tx_maybe_reschedule (session_worker_t * wrk, session_tx_context_t * ctx, session_evt_elt_t * elt) { session_t *s = ctx->s; svm_fifo_unset_event (s->tx_fifo); if (svm_fifo_max_dequeue_cons (s->tx_fifo) > ctx->sp.tx_offset) { if (svm_fifo_set_event (s->tx_fifo)) session_evt_add_head_old (wrk, elt); } else { transport_connection_deschedule (ctx->tc); } } always_inline void session_tx_add_pending_buffer (session_worker_t *wrk, u32 bi, u32 next_index) { if (PREDICT_TRUE (!wrk->dma_enabled)) { vec_add1 (wrk->pending_tx_buffers, bi); vec_add1 (wrk->pending_tx_nexts, next_index); } else { session_dma_transfer *dma_transfer = &wrk->dma_trans[wrk->trans_tail]; vec_add1 (dma_transfer->pending_tx_buffers, bi); vec_add1 (dma_transfer->pending_tx_nexts, next_index); } } always_inline int session_tx_fifo_read_and_snd_i (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * elt, int *n_tx_packets, u8 peek_data) { u32 n_trace, n_left, pbi, next_index, max_burst; session_tx_context_t *ctx = &wrk->ctx; session_main_t *smm = &session_main; session_event_t *e = &elt->evt; vlib_main_t *vm = wrk->vm; transport_proto_t tp; vlib_buffer_t *pb; u16 n_bufs, rv; if (PREDICT_FALSE ((rv = session_tx_not_ready (ctx->s, peek_data)))) { if (rv < 2) session_evt_add_old (wrk, elt); return SESSION_TX_NO_DATA; } next_index = smm->session_type_to_next[ctx->s->session_type]; max_burst = SESSION_NODE_FRAME_SIZE - *n_tx_packets; tp = session_get_transport_proto (ctx->s); ctx->transport_vft = transport_protocol_get_vft (tp); ctx->tc = session_tx_get_transport (ctx, peek_data); if (PREDICT_FALSE (e->event_type == SESSION_IO_EVT_TX_FLUSH)) { if (ctx->transport_vft->flush_data) ctx->transport_vft->flush_data (ctx->tc); e->event_type = SESSION_IO_EVT_TX; } if (ctx->s->flags & SESSION_F_CUSTOM_TX) { u32 n_custom_tx; ctx->s->flags &= ~SESSION_F_CUSTOM_TX; ctx->sp.max_burst_size = max_burst; n_custom_tx = ctx->transport_vft->custom_tx (ctx->tc, &ctx->sp); *n_tx_packets += n_custom_tx; if (PREDICT_FALSE (ctx->s->session_state >= SESSION_STATE_TRANSPORT_CLOSED)) { svm_fifo_unset_event (ctx->s->tx_fifo); return SESSION_TX_OK; } max_burst -= n_custom_tx; if (!max_burst || (ctx->s->flags & SESSION_F_CUSTOM_TX)) { session_evt_add_old (wrk, elt); return SESSION_TX_OK; } } /* Connection previously descheduled because it had no data to send. * Clear descheduled flag and reset pacer if in use */ if (transport_connection_is_descheduled (ctx->tc)) transport_connection_clear_descheduled (ctx->tc); transport_connection_snd_params (ctx->tc, &ctx->sp); if (!ctx->sp.snd_space) { /* If the deschedule flag was set, remove session from scheduler. * Transport is responsible for rescheduling this session. */ if (ctx->sp.flags & TRANSPORT_SND_F_DESCHED) transport_connection_deschedule (ctx->tc); /* Request to postpone the session, e.g., zero-wnd and transport * is not currently probing */ else if (ctx->sp.flags & TRANSPORT_SND_F_POSTPONE) session_evt_add_old (wrk, elt); /* This flow queue is "empty" so it should be re-evaluated before * the ones that have data to send. */ else session_evt_add_head_old (wrk, elt); return SESSION_TX_NO_DATA; } if (transport_connection_is_tx_paced (ctx->tc)) { u32 snd_space = transport_connection_tx_pacer_burst (ctx->tc); if (snd_space < TRANSPORT_PACER_MIN_BURST) { session_evt_add_head_old (wrk, elt); return SESSION_TX_NO_DATA; } snd_space = clib_min (ctx->sp.snd_space, snd_space); ctx->sp.snd_space = snd_space >= ctx->sp.snd_mss ? snd_space - snd_space % ctx->sp.snd_mss : snd_space; } /* Check how much we can pull. */ session_tx_set_dequeue_params (vm, ctx, max_burst, peek_data); if (PREDICT_FALSE (!ctx->max_len_to_snd)) { transport_connection_tx_pacer_reset_bucket (ctx->tc, 0); session_tx_maybe_reschedule (wrk, ctx, elt); return SESSION_TX_NO_DATA; } vec_validate_aligned (ctx->tx_buffers, ctx->n_bufs_needed - 1, CLIB_CACHE_LINE_BYTES); n_bufs = vlib_buffer_alloc (vm, ctx->tx_buffers, ctx->n_bufs_needed); if (PREDICT_FALSE (n_bufs < ctx->n_bufs_needed)) { if (n_bufs) vlib_buffer_free (vm, ctx->tx_buffers, n_bufs); session_evt_add_head_old (wrk, elt); vlib_node_increment_counter (wrk->vm, node->node_index, SESSION_QUEUE_ERROR_NO_BUFFER, 1); return SESSION_TX_NO_BUFFERS; } if (transport_connection_is_tx_paced (ctx->tc)) transport_connection_tx_pacer_update_bytes (ctx->tc, ctx->max_len_to_snd); ctx->left_to_snd = ctx->max_len_to_snd; n_left = ctx->n_segs_per_evt; vec_validate (ctx->transport_pending_bufs, n_left); while (n_left >= 4) { vlib_buffer_t *b0, *b1; u32 bi0, bi1; pbi = ctx->tx_buffers[n_bufs - 3]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); pbi = ctx->tx_buffers[n_bufs - 4]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); bi0 = ctx->tx_buffers[--n_bufs]; bi1 = ctx->tx_buffers[--n_bufs]; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); session_tx_fill_buffer (wrk, ctx, b0, &n_bufs, peek_data); session_tx_fill_buffer (wrk, ctx, b1, &n_bufs, peek_data); ctx->transport_pending_bufs[ctx->n_segs_per_evt - n_left] = b0; ctx->transport_pending_bufs[ctx->n_segs_per_evt - n_left + 1] = b1; n_left -= 2; session_tx_add_pending_buffer (wrk, bi0, next_index); session_tx_add_pending_buffer (wrk, bi1, next_index); } while (n_left) { vlib_buffer_t *b0; u32 bi0; if (n_left > 1) { pbi = ctx->tx_buffers[n_bufs - 2]; pb = vlib_get_buffer (vm, pbi); vlib_prefetch_buffer_header (pb, STORE); } bi0 = ctx->tx_buffers[--n_bufs]; b0 = vlib_get_buffer (vm, bi0); session_tx_fill_buffer (wrk, ctx, b0, &n_bufs, peek_data); ctx->transport_pending_bufs[ctx->n_segs_per_evt - n_left] = b0; n_left -= 1; session_tx_add_pending_buffer (wrk, bi0, next_index); } /* Ask transport to push headers */ ctx->transport_vft->push_header (ctx->tc, ctx->transport_pending_bufs, ctx->n_segs_per_evt); if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node)) > 0)) session_tx_trace_frame (vm, node, next_index, ctx->transport_pending_bufs, ctx->n_segs_per_evt, ctx->s, n_trace); if (PREDICT_FALSE (n_bufs)) vlib_buffer_free (vm, ctx->tx_buffers, n_bufs); *n_tx_packets += ctx->n_segs_per_evt; SESSION_EVT (SESSION_EVT_DEQ, ctx->s, ctx->max_len_to_snd, ctx->max_dequeue, ctx->s->tx_fifo->shr->has_event, wrk->last_vlib_time); ASSERT (ctx->left_to_snd == 0); /* If we couldn't dequeue all bytes reschedule as old flow. Otherwise, * check if application enqueued more data and reschedule accordingly */ if (ctx->max_len_to_snd < ctx->max_dequeue) session_evt_add_old (wrk, elt); else session_tx_maybe_reschedule (wrk, ctx, elt); if (!peek_data) { u32 n_dequeued = ctx->max_len_to_snd; if (ctx->transport_vft->transport_options.tx_type == TRANSPORT_TX_DGRAM) n_dequeued += ctx->n_segs_per_evt * SESSION_CONN_HDR_LEN; if (svm_fifo_needs_deq_ntf (ctx->s->tx_fifo, n_dequeued)) session_dequeue_notify (ctx->s); } return SESSION_TX_OK; } int session_tx_fifo_peek_and_snd (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * e, int *n_tx_packets) { return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 1); } int session_tx_fifo_dequeue_and_snd (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * e, int *n_tx_packets) { return session_tx_fifo_read_and_snd_i (wrk, node, e, n_tx_packets, 0); } int session_tx_fifo_dequeue_internal (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * elt, int *n_tx_packets) { transport_send_params_t *sp = &wrk->ctx.sp; session_t *s = wrk->ctx.s; clib_llist_index_t ei; u32 n_packets; if (PREDICT_FALSE ((s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) || (s->session_state == SESSION_STATE_CONNECTING && (s->flags & SESSION_F_HALF_OPEN)))) return 0; /* Clear custom-tx flag used to request reschedule for tx */ s->flags &= ~SESSION_F_CUSTOM_TX; sp->flags = 0; sp->bytes_dequeued = 0; sp->max_burst_size = clib_min (SESSION_NODE_FRAME_SIZE - *n_tx_packets, TRANSPORT_PACER_MAX_BURST_PKTS); /* Grab elt index since app transports can enqueue events on tx */ ei = clib_llist_entry_index (wrk->event_elts, elt); n_packets = transport_custom_tx (session_get_transport_proto (s), s, sp); *n_tx_packets += n_packets; elt = clib_llist_elt (wrk->event_elts, ei); if (s->flags & SESSION_F_CUSTOM_TX) { session_evt_add_old (wrk, elt); } else if (!(sp->flags & TRANSPORT_SND_F_DESCHED)) { svm_fifo_unset_event (s->tx_fifo); if (svm_fifo_max_dequeue_cons (s->tx_fifo)) if (svm_fifo_set_event (s->tx_fifo)) session_evt_add_head_old (wrk, elt); } if (sp->bytes_dequeued && svm_fifo_needs_deq_ntf (s->tx_fifo, sp->bytes_dequeued)) session_dequeue_notify (s); return n_packets; } always_inline session_t * session_event_get_session (session_worker_t * wrk, session_event_t * e) { if (PREDICT_FALSE (pool_is_free_index (wrk->sessions, e->session_index))) return 0; ASSERT (session_is_valid (e->session_index, wrk->vm->thread_index)); return pool_elt_at_index (wrk->sessions, e->session_index); } always_inline void session_event_dispatch_ctrl (session_worker_t * wrk, session_evt_elt_t * elt) { clib_llist_index_t ei; void (*fp) (void *); session_event_t *e; session_t *s; ei = clib_llist_entry_index (wrk->event_elts, elt); e = &elt->evt; switch (e->event_type) { case SESSION_CTRL_EVT_RPC: fp = e->rpc_args.fp; (*fp) (e->rpc_args.arg); break; case SESSION_CTRL_EVT_HALF_CLOSE: s = session_get_from_handle_if_valid (e->session_handle); if (PREDICT_FALSE (!s)) break; session_transport_half_close (s); break; case SESSION_CTRL_EVT_CLOSE: s = session_get_from_handle_if_valid (e->session_handle); if (PREDICT_FALSE (!s)) break; session_transport_close (s); break; case SESSION_CTRL_EVT_RESET: s = session_get_from_handle_if_valid (e->session_handle); if (PREDICT_FALSE (!s)) break; session_transport_reset (s); break; case SESSION_CTRL_EVT_LISTEN: session_mq_listen_handler (wrk, elt); break; case SESSION_CTRL_EVT_LISTEN_URI: session_mq_listen_uri_handler (wrk, elt); break; case SESSION_CTRL_EVT_UNLISTEN: session_mq_unlisten_handler (wrk, elt); break; case SESSION_CTRL_EVT_CONNECT: session_mq_connect_handler (wrk, elt); break; case SESSION_CTRL_EVT_CONNECT_URI: session_mq_connect_uri_handler (wrk, elt); break; case SESSION_CTRL_EVT_SHUTDOWN: session_mq_shutdown_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_DISCONNECT: session_mq_disconnect_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_DISCONNECTED: session_mq_disconnected_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_ACCEPTED_REPLY: session_mq_accepted_reply_handler (wrk, elt); break; case SESSION_CTRL_EVT_DISCONNECTED_REPLY: session_mq_disconnected_reply_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_RESET_REPLY: session_mq_reset_reply_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_WORKER_UPDATE: session_mq_worker_update_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_APP_DETACH: app_mq_detach_handler (wrk, elt); break; case SESSION_CTRL_EVT_APP_WRK_RPC: session_mq_app_wrk_rpc_handler (session_evt_ctrl_data (wrk, elt)); break; case SESSION_CTRL_EVT_TRANSPORT_ATTR: session_mq_transport_attr_handler (session_evt_ctrl_data (wrk, elt)); break; default: clib_warning ("unhandled event type %d", e->event_type); } /* Regrab elements in case pool moved */ elt = clib_llist_elt (wrk->event_elts, ei); if (!clib_llist_elt_is_linked (elt, evt_list)) { e = &elt->evt; if (e->event_type >= SESSION_CTRL_EVT_BOUND) session_evt_ctrl_data_free (wrk, elt); clib_llist_put (wrk->event_elts, elt); } SESSION_EVT (SESSION_EVT_COUNTS, CNT_CTRL_EVTS, 1, wrk); } always_inline void session_event_dispatch_io (session_worker_t * wrk, vlib_node_runtime_t * node, session_evt_elt_t * elt, int *n_tx_packets) { session_main_t *smm = &session_main; app_worker_t *app_wrk; clib_llist_index_t ei; session_event_t *e; session_t *s; ei = clib_llist_entry_index (wrk->event_elts, elt); e = &elt->evt; switch (e->event_type) { case SESSION_IO_EVT_TX_FLUSH: case SESSION_IO_EVT_TX: s = session_event_get_session (wrk, e); if (PREDICT_FALSE (!s)) break; CLIB_PREFETCH (s->tx_fifo, sizeof (*(s->tx_fifo)), LOAD); wrk->ctx.s = s; /* Spray packets in per session type frames, since they go to * different nodes */ (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets); break; case SESSION_IO_EVT_RX: s = session_event_get_session (wrk, e); if (!s || s->session_state >= SESSION_STATE_TRANSPORT_CLOSED) break; transport_app_rx_evt (session_get_transport_proto (s), s->connection_index, s->thread_index); break; case SESSION_IO_EVT_BUILTIN_RX: s = session_event_get_session (wrk, e); if (PREDICT_FALSE (!s || s->session_state >= SESSION_STATE_CLOSING)) break; svm_fifo_unset_event (s->rx_fifo); app_wrk = app_worker_get (s->app_wrk_index); app_worker_rx_notify (app_wrk, s); break; case SESSION_IO_EVT_TX_MAIN: s = session_get_if_valid (e->session_index, 0 /* main thread */); if (PREDICT_FALSE (!s)) break; wrk->ctx.s = s; if (PREDICT_TRUE (s != 0)) (smm->session_tx_fns[s->session_type]) (wrk, node, elt, n_tx_packets); break; default: clib_warning ("unhandled event type %d", e->event_type); } SESSION_EVT (SESSION_EVT_IO_EVT_COUNTS, e->event_type, 1, wrk); /* Regrab elements in case pool moved */ elt = clib_llist_elt (wrk->event_elts, ei); if (!clib_llist_elt_is_linked (elt, evt_list)) clib_llist_put (wrk->event_elts, elt); } static const u32 session_evt_msg_sizes[] = { #define _(symc, sym) \ [SESSION_CTRL_EVT_ ## symc] = sizeof (session_ ## sym ##_msg_t), foreach_session_ctrl_evt #undef _ }; always_inline void session_update_time_subscribers (session_main_t *smm, clib_time_type_t now, u32 thread_index) { session_update_time_fn *fn; vec_foreach (fn, smm->update_time_fns) (*fn) (now, thread_index); } always_inline void session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt) { session_evt_elt_t *elt; if (evt->event_type >= SESSION_CTRL_EVT_RPC) { elt = session_evt_alloc_ctrl (wrk); if (evt->event_type >= SESSION_CTRL_EVT_BOUND) { elt->evt.ctrl_data_index = session_evt_ctrl_data_alloc (wrk); elt->evt.event_type = evt->event_type; clib_memcpy_fast (session_evt_ctrl_data (wrk, elt), evt->data, session_evt_msg_sizes[evt->event_type]); } else { /* Internal control events fit into io events footprint */ clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt)); } } else { elt = session_evt_alloc_new (wrk); clib_memcpy_fast (&elt->evt, evt, sizeof (elt->evt)); } } static void session_flush_pending_tx_buffers (session_worker_t * wrk, vlib_node_runtime_t * node) { vlib_buffer_enqueue_to_next_vec (wrk->vm, node, &wrk->pending_tx_buffers, &wrk->pending_tx_nexts, vec_len (wrk->pending_tx_nexts)); vec_reset_length (wrk->pending_tx_buffers); vec_reset_length (wrk->pending_tx_nexts); } int session_wrk_handle_mq (session_worker_t *wrk, svm_msg_q_t *mq) { svm_msg_q_msg_t _msg, *msg = &_msg; u32 i, n_to_dequeue = 0; session_event_t *evt; n_to_dequeue = svm_msg_q_size (mq); for (i = 0; i < n_to_dequeue; i++) { svm_msg_q_sub_raw (mq, msg); evt = svm_msg_q_msg_data (mq, msg); session_evt_add_to_list (wrk, evt); svm_msg_q_free_msg (mq, msg); } return n_to_dequeue; } static void session_wrk_update_state (session_worker_t *wrk) { vlib_main_t *vm = wrk->vm; if (wrk->state == SESSION_WRK_POLLING) { if (clib_llist_elts (wrk->event_elts) == 5 && vlib_last_vectors_per_main_loop (vm) < 1) { session_wrk_set_state (wrk, SESSION_WRK_INTERRUPT); vlib_node_set_state (vm, session_queue_node.index, VLIB_NODE_STATE_INTERRUPT); } } else if (wrk->state == SESSION_WRK_INTERRUPT) { if (clib_llist_elts (wrk->event_elts) > 5 || vlib_last_vectors_per_main_loop (vm) > 1) { session_wrk_set_state (wrk, SESSION_WRK_POLLING); vlib_node_set_state (vm, session_queue_node.index, VLIB_NODE_STATE_POLLING); } else if (PREDICT_FALSE (!pool_elts (wrk->sessions))) { session_wrk_set_state (wrk, SESSION_WRK_IDLE); } } else { if (clib_llist_elts (wrk->event_elts)) { session_wrk_set_state (wrk, SESSION_WRK_INTERRUPT); } } } static uword session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 thread_index = vm->thread_index, __clib_unused n_evts; session_evt_elt_t *elt, *ctrl_he, *new_he, *old_he; session_main_t *smm = vnet_get_session_main (); session_worker_t *wrk = &smm->wrk[thread_index]; clib_llist_index_t ei, next_ei, old_ti; int n_tx_packets; SESSION_EVT (SESSION_EVT_DISPATCH_START, wrk); session_wrk_update_time (wrk, vlib_time_now (vm)); /* * Update transport time */ session_update_time_subscribers (smm, wrk->last_vlib_time, thread_index); n_tx_packets = vec_len (wrk->pending_tx_buffers); SESSION_EVT (SESSION_EVT_DSP_CNTRS, UPDATE_TIME, wrk); if (PREDICT_FALSE (wrk->dma_enabled)) { if (wrk->trans_head == ((wrk->trans_tail + 1) & (wrk->trans_size - 1))) return 0; wrk->batch = vlib_dma_batch_new (vm, wrk->config_index); if (!wrk->batch) return 0; } /* * Dequeue new internal mq events */ n_evts = session_wrk_handle_mq (wrk, wrk->vpp_event_queue); SESSION_EVT (SESSION_EVT_DSP_CNTRS, MQ_DEQ, wrk, n_evts); /* * Handle control events */ ei = wrk->ctrl_head; ctrl_he = clib_llist_elt (wrk->event_elts, ei); next_ei = clib_llist_next_index (ctrl_he, evt_list); old_ti = clib_llist_prev_index (ctrl_he, evt_list); while (ei != old_ti) { ei = next_ei; elt = clib_llist_elt (wrk->event_elts, next_ei); next_ei = clib_llist_next_index (elt, evt_list); clib_llist_remove (wrk->event_elts, evt_list, elt); session_event_dispatch_ctrl (wrk, elt); } SESSION_EVT (SESSION_EVT_DSP_CNTRS, CTRL_EVTS, wrk); /* * Handle the new io events. */ new_he = clib_llist_elt (wrk->event_elts, wrk->new_head); old_he = clib_llist_elt (wrk->event_elts, wrk->old_head); old_ti = clib_llist_prev_index (old_he, evt_list); ei = clib_llist_next_index (new_he, evt_list); while (ei != wrk->new_head && n_tx_packets < SESSION_NODE_FRAME_SIZE) { elt = clib_llist_elt (wrk->event_elts, ei); ei = clib_llist_next_index (elt, evt_list); clib_llist_remove (wrk->event_elts, evt_list, elt); session_event_dispatch_io (wrk, node, elt, &n_tx_packets); } SESSION_EVT (SESSION_EVT_DSP_CNTRS, NEW_IO_EVTS, wrk); /* * Handle the old io events, if we had any prior to processing the new ones */ if (old_ti != wrk->old_head) { old_he = clib_llist_elt (wrk->event_elts, wrk->old_head); ei = clib_llist_next_index (old_he, evt_list); while (n_tx_packets < SESSION_NODE_FRAME_SIZE) { elt = clib_llist_elt (wrk->event_elts, ei); next_ei = clib_llist_next_index (elt, evt_list); clib_llist_remove (wrk->event_elts, evt_list, elt); session_event_dispatch_io (wrk, node, elt, &n_tx_packets); if (ei == old_ti) break; ei = next_ei; }; } if (PREDICT_FALSE (wrk->dma_enabled)) { if (wrk->batch_num) { vlib_dma_batch_set_cookie (vm, wrk->batch, wrk->trans_tail); wrk->batch_num = 0; wrk->trans_tail++; if (wrk->trans_tail == wrk->trans_size) wrk->trans_tail = 0; } vlib_dma_batch_submit (vm, wrk->batch); } SESSION_EVT (SESSION_EVT_DSP_CNTRS, OLD_IO_EVTS, wrk); if (vec_len (wrk->pending_tx_buffers)) session_flush_pending_tx_buffers (wrk, node); vlib_node_increment_counter (vm, session_queue_node.index, SESSION_QUEUE_ERROR_TX, n_tx_packets); SESSION_EVT (SESSION_EVT_DISPATCH_END, wrk, n_tx_packets); if (wrk->flags & SESSION_WRK_F_ADAPTIVE) session_wrk_update_state (wrk); return n_tx_packets; } VLIB_REGISTER_NODE (session_queue_node) = { .function = session_queue_node_fn, .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED, .name = "session-queue", .format_trace = format_session_queue_trace, .type = VLIB_NODE_TYPE_INPUT, .n_errors = SESSION_QUEUE_N_ERROR, .error_counters = session_error_counters, .state = VLIB_NODE_STATE_DISABLED, }; static clib_error_t * session_wrk_tfd_read_ready (clib_file_t *cf) { session_worker_t *wrk = session_main_get_worker (cf->private_data); u64 buf; int rv; vlib_node_set_interrupt_pending (wrk->vm, session_queue_node.index); rv = read (wrk->timerfd, &buf, sizeof (buf)); if (rv < 0 && errno != EAGAIN) clib_unix_warning ("failed"); return 0; } static clib_error_t * session_wrk_tfd_write_ready (clib_file_t *cf) { return 0; } void session_wrk_enable_adaptive_mode (session_worker_t *wrk) { u32 thread_index = wrk->vm->thread_index; clib_file_t template = { 0 }; if ((wrk->timerfd = timerfd_create (CLOCK_MONOTONIC, TFD_NONBLOCK)) < 0) clib_warning ("timerfd_create"); template.read_function = session_wrk_tfd_read_ready; template.write_function = session_wrk_tfd_write_ready; template.file_descriptor = wrk->timerfd; template.private_data = thread_index; template.polling_thread_index = thread_index; template.description = format (0, "session-wrk-tfd-%u", thread_index); wrk->timerfd_file = clib_file_add (&file_main, &template); wrk->flags |= SESSION_WRK_F_ADAPTIVE; } static clib_error_t * session_queue_exit (vlib_main_t * vm) { if (vlib_get_n_threads () < 2) return 0; /* * Shut off (especially) worker-thread session nodes. * Otherwise, vpp can crash as the main thread unmaps the * API segment. */ vlib_worker_thread_barrier_sync (vm); session_node_enable_disable (0 /* is_enable */ ); vlib_worker_thread_barrier_release (vm); return 0; } VLIB_MAIN_LOOP_EXIT_FUNCTION (session_queue_exit); static uword session_queue_run_on_main (vlib_main_t * vm) { vlib_node_runtime_t *node; node = vlib_node_get_runtime (vm, session_queue_node.index); return session_queue_node_fn (vm, node, 0); } static uword session_queue_process (vlib_main_t * vm, vlib_node_runtime_t * rt, vlib_frame_t * f) { uword *event_data = 0; f64 timeout = 1.0; uword event_type; while (1) { vlib_process_wait_for_event_or_clock (vm, timeout); event_type = vlib_process_get_events (vm, (uword **) & event_data); switch (event_type) { case SESSION_Q_PROCESS_RUN_ON_MAIN: /* Run session queue node on main thread */ session_queue_run_on_main (vm); break; case SESSION_Q_PROCESS_STOP: vlib_node_set_state (vm, session_queue_process_node.index, VLIB_NODE_STATE_DISABLED); timeout = 100000.0; break; case ~0: /* Timed out. Run on main to ensure all events are handled */ session_queue_run_on_main (vm); break; } vec_reset_length (event_data); } return 0; } VLIB_REGISTER_NODE (session_queue_process_node) = { .function = session_queue_process, .type = VLIB_NODE_TYPE_PROCESS, .name = "session-queue-process", .state = VLIB_NODE_STATE_DISABLED, }; static_always_inline uword session_queue_pre_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { session_main_t *sm = &session_main; if (!sm->wrk[0].vpp_event_queue) return 0; node = vlib_node_get_runtime (vm, session_queue_node.index); return session_queue_node_fn (vm, node, frame); } VLIB_REGISTER_NODE (session_queue_pre_input_node) = { .function = session_queue_pre_input_inline, .type = VLIB_NODE_TYPE_PRE_INPUT, .name = "session-queue-main", .state = VLIB_NODE_STATE_DISABLED, }; /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */