diff options
Diffstat (limited to 'src/plugins/nsim/node.c')
| -rw-r--r-- | src/plugins/nsim/node.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/plugins/nsim/node.c b/src/plugins/nsim/node.c new file mode 100644 index 00000000000..69dc9be919b --- /dev/null +++ b/src/plugins/nsim/node.c @@ -0,0 +1,187 @@ +/* + * node.c - skeleton vpp engine plug-in dual-loop node skeleton + * + * Copyright (c) <current-year> <your-organization> + * 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 <vlib/vlib.h> +#include <vnet/vnet.h> +#include <vnet/pg/pg.h> +#include <vppinfra/error.h> +#include <nsim/nsim.h> + +typedef struct +{ + f64 expires; + u32 tx_sw_if_index; + int is_drop; +} nsim_trace_t; + +#ifndef CLIB_MARCH_VARIANT + +/* packet trace format function */ +static u8 * +format_nsim_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 *); + nsim_trace_t *t = va_arg (*args, nsim_trace_t *); + + if (t->is_drop) + s = format (s, "NSIM: ring drop"); + else + s = format (s, "NSIM: tx time %.6f sw_if_index %d", + t->expires, t->tx_sw_if_index); + + return s; +} +#endif /* CLIB_MARCH_VARIANT */ + +vlib_node_registration_t nsim_node; + +#define foreach_nsim_error \ +_(BUFFERED, "Packets buffered") \ +_(DROPPED, "Packets dropped due to lack of space") + +typedef enum +{ +#define _(sym,str) NSIM_ERROR_##sym, + foreach_nsim_error +#undef _ + NSIM_N_ERROR, +} nsim_error_t; + +#ifndef CLIB_MARCH_VARIANT +static char *nsim_error_strings[] = { +#define _(sym,string) string, + foreach_nsim_error +#undef _ +}; +#endif /* CLIB_MARCH_VARIANT */ + +typedef enum +{ + NSIM_NEXT_DROP, + NSIM_N_NEXT, +} nsim_next_t; + +always_inline uword +nsim_inline (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame, int is_trace) +{ + nsim_main_t *nsm = &nsim_main; + u32 n_left_from, *from; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; + u16 nexts[VLIB_FRAME_SIZE], *next; + u32 my_thread_index = vm->thread_index; + nsim_wheel_t *wp = nsm->wheel_by_thread[my_thread_index]; + f64 now = vlib_time_now (vm); + f64 expires = now + nsm->delay; + int is_drop0; + u32 no_error = node->errors[NSIM_ERROR_BUFFERED]; + u32 no_buffer_error = node->errors[NSIM_ERROR_DROPPED]; + nsim_wheel_entry_t *ep = 0; + + ASSERT (wp); + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + + vlib_get_buffers (vm, from, bufs, n_left_from); + b = bufs; + next = nexts; + + /* There is no point in trying to do more than 1 pkt here */ + while (n_left_from > 0) + { + b[0]->error = no_error; + next[0] = NSIM_NEXT_DROP; + is_drop0 = 0; + if (PREDICT_TRUE (wp->cursize < wp->wheel_size)) + { + ep = wp->entries + wp->tail; + wp->tail++; + if (wp->tail == wp->wheel_size) + wp->tail = 0; + wp->cursize++; + + ep->tx_time = expires; + ep->tx_sw_if_index = + (vnet_buffer (b[0])->sw_if_index[VLIB_RX] == nsm->sw_if_index0) + ? nsm->sw_if_index1 : nsm->sw_if_index0; + ep->current_length = vlib_buffer_length_in_chain (vm, b[0]); + ASSERT (ep->current_length <= WHEEL_ENTRY_DATA_SIZE); + clib_memcpy (ep->data, vlib_buffer_get_current (b[0]), + ep->current_length); + } + else /* out of wheel space, drop pkt */ + b[0]->error = no_buffer_error; + + if (is_trace) + { + if (b[0]->flags & VLIB_BUFFER_IS_TRACED) + { + nsim_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); + t->expires = expires; + t->is_drop = is_drop0; + if (is_drop0 == 0) + t->tx_sw_if_index = ep->tx_sw_if_index; + } + } + + b += 1; + next += 1; + n_left_from -= 1; + } + vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); + return frame->n_vectors; +} + +VLIB_NODE_FN (nsim_node) (vlib_main_t * vm, vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + if (PREDICT_FALSE (node->flags & VLIB_NODE_FLAG_TRACE)) + return nsim_inline (vm, node, frame, 1 /* is_trace */ ); + else + return nsim_inline (vm, node, frame, 0 /* is_trace */ ); +} + +/* *INDENT-OFF* */ +#ifndef CLIB_MARCH_VARIANT +VLIB_REGISTER_NODE (nsim_node) = +{ + .name = "nsim", + .vector_size = sizeof (u32), + .format_trace = format_nsim_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(nsim_error_strings), + .error_strings = nsim_error_strings, + + .n_next_nodes = NSIM_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [NSIM_NEXT_DROP] = "error-drop", + }, +}; +#endif /* CLIB_MARCH_VARIANT */ +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |