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Diffstat (limited to 'src/vlib/drop.c')
| -rw-r--r-- | src/vlib/drop.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/src/vlib/drop.c b/src/vlib/drop.c new file mode 100644 index 00000000000..2b245b561e3 --- /dev/null +++ b/src/vlib/drop.c @@ -0,0 +1,283 @@ +/* + * drop.c - Punt and drop nodes + * + * Copyright (c) 2015 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 <vlib/vlib.h> + +typedef enum +{ + ERROR_DISPOSITION_DROP, + ERROR_DISPOSITION_PUNT, + ERROR_N_DISPOSITION, +} error_disposition_t; + +static u8 * +validate_error (vlib_main_t * vm, vlib_error_t * e, u32 index) +{ + uword node_index = vlib_error_get_node (e[0]); + uword code = vlib_error_get_code (e[0]); + vlib_node_t *n; + + if (node_index >= vec_len (vm->node_main.nodes)) + return format (0, "[%d], node index out of range 0x%x, error 0x%x", + index, node_index, e[0]); + + n = vlib_get_node (vm, node_index); + if (code >= n->n_errors) + return format (0, "[%d], code %d out of range for node %v", + index, code, n->name); + + return 0; +} + +static u8 * +validate_error_frame (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * f) +{ + u32 *buffers = vlib_frame_vector_args (f); + vlib_buffer_t *b; + u8 *msg = 0; + uword i; + + for (i = 0; i < f->n_vectors; i++) + { + b = vlib_get_buffer (vm, buffers[i]); + msg = validate_error (vm, &b->error, i); + if (msg) + return msg; + } + + return msg; +} + +always_inline u32 +counter_index (vlib_main_t * vm, vlib_error_t e) +{ + vlib_node_t *n; + u32 ci, ni; + + ni = vlib_error_get_node (e); + n = vlib_get_node (vm, ni); + + ci = vlib_error_get_code (e); + ASSERT (ci < n->n_errors); + + ci += n->error_heap_index; + + return ci; +} + +static u8 * +format_error_trace (u8 * s, va_list * va) +{ + vlib_main_t *vm = va_arg (*va, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); + vlib_error_t *e = va_arg (*va, vlib_error_t *); + vlib_node_t *error_node; + vlib_error_main_t *em = &vm->error_main; + u32 i; + + error_node = vlib_get_node (vm, vlib_error_get_node (e[0])); + i = counter_index (vm, e[0]); + s = format (s, "%v: %s", error_node->name, em->error_strings_heap[i]); + + return s; +} + +static void +trace_errors (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + u32 n_left, *buffers; + + buffers = vlib_frame_vector_args (frame); + n_left = frame->n_vectors; + + while (n_left >= 4) + { + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + vlib_error_t *t0, *t1; + + /* Prefetch next iteration. */ + vlib_prefetch_buffer_with_index (vm, buffers[2], LOAD); + vlib_prefetch_buffer_with_index (vm, buffers[3], LOAD); + + bi0 = buffers[0]; + bi1 = buffers[1]; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0])); + t0[0] = b0->error; + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) + { + t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0])); + t1[0] = b1->error; + } + buffers += 2; + n_left -= 2; + } + + while (n_left >= 1) + { + u32 bi0; + vlib_buffer_t *b0; + vlib_error_t *t0; + + bi0 = buffers[0]; + + b0 = vlib_get_buffer (vm, bi0); + + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0])); + t0[0] = b0->error; + } + buffers += 1; + n_left -= 1; + } +} + +static_always_inline uword +process_drop_punt (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame, error_disposition_t disposition) +{ + u32 errors[VLIB_FRAME_SIZE], *error, *from, n_left; + vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; + vlib_error_main_t *em = &vm->error_main; + + from = vlib_frame_vector_args (frame); + n_left = frame->n_vectors; + b = bufs; + error = errors; + + vlib_get_buffers (vm, from, bufs, n_left); + + if (node->flags & VLIB_NODE_FLAG_TRACE) + trace_errors (vm, node, frame); + + /* collect the array of error first ... */ + while (n_left >= 4) + { + if (n_left >= 12) + { + /* Prefetch 8 ahead - there's not much going on in each iteration */ + vlib_prefetch_buffer_header (b[4], LOAD); + vlib_prefetch_buffer_header (b[5], LOAD); + vlib_prefetch_buffer_header (b[6], LOAD); + vlib_prefetch_buffer_header (b[7], LOAD); + } + error[0] = b[0]->error; + error[1] = b[1]->error; + error[2] = b[2]->error; + error[3] = b[3]->error; + + error += 4; + n_left -= 4; + b += 4; + } + while (n_left) + { + error[0] = b[0]->error; + + error += 1; + n_left -= 1; + b += 1; + } + + /* ... then count against them in blocks */ + n_left = frame->n_vectors; + + while (n_left) + { + u16 off, count; + u32 c_index; + + off = frame->n_vectors - n_left; + + error = errors + off; + + count = clib_count_equal_u32 (error, n_left); + n_left -= count; + + c_index = counter_index (vm, error[0]); + em->counters[c_index] += count; + + vlib_error_elog_count (vm, c_index, count); + } + + if (disposition == ERROR_DISPOSITION_DROP || !vm->os_punt_frame) + { + vlib_buffer_free (vm, from, frame->n_vectors); + + /* If there is no punt function, free the frame as well. */ + if (disposition == ERROR_DISPOSITION_PUNT && !vm->os_punt_frame) + vlib_frame_free (vm, node, frame); + } + else + vm->os_punt_frame (vm, node, frame); + + return frame->n_vectors; +} + +VLIB_NODE_FN (error_drop_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return process_drop_punt (vm, node, frame, ERROR_DISPOSITION_DROP); +} + +VLIB_NODE_FN (error_punt_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + return process_drop_punt (vm, node, frame, ERROR_DISPOSITION_PUNT); +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (error_drop_node) = { + .name = "drop", + .flags = VLIB_NODE_FLAG_IS_DROP, + .vector_size = sizeof (u32), + .format_trace = format_error_trace, + .validate_frame = validate_error_frame, +}; +/* *INDENT-ON* */ + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (error_punt_node) = { + .name = "punt", + .flags = (VLIB_NODE_FLAG_FRAME_NO_FREE_AFTER_DISPATCH + | VLIB_NODE_FLAG_IS_PUNT), + .vector_size = sizeof (u32), + .format_trace = format_error_trace, + .validate_frame = validate_error_frame, +}; +/* *INDENT-ON* */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |