diff options
Diffstat (limited to 'src/vnet/interface/runtime.c')
| -rw-r--r-- | src/vnet/interface/runtime.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/vnet/interface/runtime.c b/src/vnet/interface/runtime.c new file mode 100644 index 00000000000..c1b096f3c86 --- /dev/null +++ b/src/vnet/interface/runtime.c @@ -0,0 +1,229 @@ +/* + * 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; + uword flags; + + hi = vnet_get_hw_interface (vnm, rxq->hw_if_index); + + if (hi->input_node_index != node_index) + continue; + + flags = vnet_sw_interface_get_flags (vnm, hi->sw_if_index); + if ((flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) == 0) + { + log_debug ("skip interface %v (admin down)", hi->name); + 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); + } + } + + 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); +} |