/* * Copyright (c) 2020 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 <vnet/vnet.h> #include <vnet/devices/devices.h> #include <vnet/feature/feature.h> #include <vnet/ip/ip.h> #include <vnet/ethernet/ethernet.h> #include <vnet/interface/rx_queue_funcs.h> #include <vlib/unix/unix.h> VLIB_REGISTER_LOG_CLASS (if_rxq_log, static) = { .class_name = "interface", .subclass_name = "runtime", }; #define log_debug(fmt, ...) vlib_log_debug (if_rxq_log.class, fmt, __VA_ARGS__) #define log_err(fmt, ...) vlib_log_err (if_rxq_log.class, fmt, __VA_ARGS__) static char *node_state_str[] = { [VLIB_NODE_STATE_DISABLED] = "disabled", [VLIB_NODE_STATE_POLLING] = "polling", [VLIB_NODE_STATE_INTERRUPT] = "interrupt", }; static int poll_data_sort (void *a1, void *a2) { vnet_hw_if_rxq_poll_vector_t *pv1 = a1; vnet_hw_if_rxq_poll_vector_t *pv2 = a2; if (pv1->dev_instance > pv2->dev_instance) return 1; else if (pv1->dev_instance < pv2->dev_instance) return -1; else if (pv1->queue_id > pv2->queue_id) return 1; else if (pv1->queue_id < pv2->queue_id) return -1; else return 0; } void vnet_hw_if_update_runtime_data (vnet_main_t *vnm, u32 hw_if_index) { vlib_main_t *vm = vlib_get_main (); vnet_interface_main_t *im = &vnm->interface_main; vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index); u32 node_index = hi->input_node_index; vnet_hw_if_rx_queue_t *rxq; vnet_hw_if_rxq_poll_vector_t *pv, **d = 0; vlib_node_state_t *per_thread_node_state = 0; u32 n_threads = vec_len (vlib_mains); int something_changed = 0; clib_bitmap_t *pending_int = 0; int last_int = -1; log_debug ("update node '%U' triggered by interface %v", format_vlib_node_name, vm, node_index, hi->name); vec_validate (d, n_threads - 1); vec_validate_init_empty (per_thread_node_state, n_threads - 1, VLIB_NODE_STATE_DISABLED); /* find out desired node state on each thread */ pool_foreach (rxq, im->hw_if_rx_queues) { u32 ti = rxq->thread_index; ASSERT (rxq->mode != VNET_HW_IF_RX_MODE_UNKNOWN); ASSERT (rxq->mode != VNET_HW_IF_RX_MODE_DEFAULT); hi = vnet_get_hw_interface (vnm, rxq->hw_if_index); if (hi->input_node_index != node_index) continue; if (rxq->mode == VNET_HW_IF_RX_MODE_POLLING) per_thread_node_state[ti] = VLIB_NODE_STATE_POLLING; if (per_thread_node_state[ti] == VLIB_NODE_STATE_POLLING) continue; if (rxq->mode == VNET_HW_IF_RX_MODE_INTERRUPT || rxq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE) per_thread_node_state[ti] = VLIB_NODE_STATE_INTERRUPT; } /* construct per-thread polling vectors */ pool_foreach (rxq, im->hw_if_rx_queues) { u32 ti = rxq->thread_index; hi = vnet_get_hw_interface (vnm, rxq->hw_if_index); if (hi->input_node_index != node_index) continue; if (rxq->mode == VNET_HW_IF_RX_MODE_INTERRUPT || rxq->mode == VNET_HW_IF_RX_MODE_ADAPTIVE) last_int = clib_max (last_int, rxq - im->hw_if_rx_queues); if (per_thread_node_state[ti] != VLIB_NODE_STATE_POLLING) continue; vec_add2_aligned (d[ti], pv, 1, CLIB_CACHE_LINE_BYTES); pv->dev_instance = rxq->dev_instance; pv->queue_id = rxq->queue_id; } /* sort poll vectors and compare them with active ones to avoid * unnecesary barrier */ for (int i = 0; i < n_threads; i++) { vlib_node_state_t old_state; vec_sort_with_function (d[i], poll_data_sort); old_state = vlib_node_get_state (vlib_mains[i], node_index); if (per_thread_node_state[i] != old_state) { something_changed = 1; log_debug ("state changed for node %U on thread %u from %s to %s", format_vlib_node_name, vm, node_index, i, node_state_str[old_state], node_state_str[per_thread_node_state[i]]); } /* check if something changed */ if (something_changed == 0) { vnet_hw_if_rx_node_runtime_t *rt; rt = vlib_node_get_runtime_data (vlib_mains[i], node_index); if (vec_len (rt->rxq_poll_vector) != vec_len (d[i])) something_changed = 1; else if (memcmp (d[i], rt->rxq_poll_vector, vec_len (d[i]) * sizeof (*d))) something_changed = 1; if (clib_interrupt_get_n_int (rt->rxq_interrupts) != last_int + 1) something_changed = 1; } } if (something_changed) { int with_barrier; if (vlib_worker_thread_barrier_held ()) { with_barrier = 0; log_debug ("%s", "already running under the barrier"); } else with_barrier = 1; if (with_barrier) vlib_worker_thread_barrier_sync (vm); for (int i = 0; i < n_threads; i++) { vlib_main_t *vm = vlib_mains[i]; vnet_hw_if_rx_node_runtime_t *rt; rt = vlib_node_get_runtime_data (vm, node_index); pv = rt->rxq_poll_vector; rt->rxq_poll_vector = d[i]; d[i] = pv; if (rt->rxq_interrupts) { void *in = rt->rxq_interrupts; int int_num = -1; while ((int_num = clib_interrupt_get_next (in, int_num)) != -1) { clib_interrupt_clear (in, int_num); pending_int = clib_bitmap_set (pending_int, int_num, 1); last_int = clib_max (last_int, int_num); } } vlib_node_set_state (vm, node_index, per_thread_node_state[i]); if (last_int >= 0) clib_interrupt_resize (&rt->rxq_interrupts, last_int + 1); else clib_interrupt_free (&rt->rxq_interrupts); } if (with_barrier) vlib_worker_thread_barrier_release (vm); } else log_debug ("skipping update of node '%U', no changes detected", format_vlib_node_name, vm, node_index); if (pending_int) { int i; clib_bitmap_foreach (i, pending_int) { vnet_hw_if_rx_queue_set_int_pending (vnm, i); } clib_bitmap_free (pending_int); } for (int i = 0; i < n_threads; i++) vec_free (d[i]); vec_free (d); vec_free (per_thread_node_state); }