diff options
Diffstat (limited to 'src/vnet/l2/l2_patch.c')
| -rw-r--r-- | src/vnet/l2/l2_patch.c | 452 |
1 files changed, 452 insertions, 0 deletions
diff --git a/src/vnet/l2/l2_patch.c b/src/vnet/l2/l2_patch.c new file mode 100644 index 00000000000..5e4691f45c7 --- /dev/null +++ b/src/vnet/l2/l2_patch.c @@ -0,0 +1,452 @@ +/* + * 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> +#include <vnet/vnet.h> +#include <vnet/pg/pg.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/feature/feature.h> +#include <vppinfra/error.h> + +typedef struct +{ + /* vector of dispositions, indexed by rx_sw_if_index */ + u32 *tx_next_by_rx_sw_if_index; + u32 *tx_sw_if_index_by_rx_sw_if_index; + + /* convenience variables */ + vlib_main_t *vlib_main; + vnet_main_t *vnet_main; +} l2_patch_main_t; + +typedef struct +{ + u32 rx_sw_if_index; + u32 tx_sw_if_index; +} l2_patch_trace_t; + +/* packet trace format function */ +static u8 * +format_l2_patch_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 *); + l2_patch_trace_t *t = va_arg (*args, l2_patch_trace_t *); + + s = format (s, "L2_PATCH: rx %d tx %d", t->rx_sw_if_index, + t->tx_sw_if_index); + return s; +} + +l2_patch_main_t l2_patch_main; + +static vlib_node_registration_t l2_patch_node; + +#define foreach_l2_patch_error \ +_(PATCHED, "L2 patch packets") \ +_(DROPPED, "L2 patch misconfigured drops") + +typedef enum +{ +#define _(sym,str) L2_PATCH_ERROR_##sym, + foreach_l2_patch_error +#undef _ + L2_PATCH_N_ERROR, +} l2_patch_error_t; + +static char *l2_patch_error_strings[] = { +#define _(sym,string) string, + foreach_l2_patch_error +#undef _ +}; + +typedef enum +{ + L2_PATCH_NEXT_DROP, + L2_PATCH_N_NEXT, +} l2_patch_next_t; + +static uword +l2_patch_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + l2_patch_next_t next_index; + l2_patch_main_t *l2pm = &l2_patch_main; + vlib_node_t *n = vlib_get_node (vm, l2_patch_node.index); + u32 node_counter_base_index = n->error_heap_index; + vlib_error_main_t *em = &vm->error_main; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t *b0, *b1; + u32 next0, next1; + u32 sw_if_index0, sw_if_index1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t *p2, *p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + /* So stupid / simple, we don't need to prefetch data */ + } + + /* speculatively enqueue b0 and b1 to the current next frame */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + from += 2; + to_next += 2; + n_left_from -= 2; + n_left_to_next -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; + + ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0); + ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0); + ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index1] != ~0); + ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1] != ~0); + + next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0]; + next1 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index1]; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = + l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; + vnet_buffer (b1)->sw_if_index[VLIB_TX] = + l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1]; + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) + { + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + l2_patch_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->rx_sw_if_index = sw_if_index0; + t->tx_sw_if_index = + l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) + { + l2_patch_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->rx_sw_if_index = sw_if_index1; + t->tx_sw_if_index = + l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index1]; + } + } + + /* verify speculative enqueues, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0; + u32 sw_if_index0; + + /* speculatively enqueue b0 to the current next frame */ + bi0 = from[0]; + to_next[0] = bi0; + from += 1; + to_next += 1; + n_left_from -= 1; + n_left_to_next -= 1; + + b0 = vlib_get_buffer (vm, bi0); + + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; + + ASSERT (l2pm->tx_next_by_rx_sw_if_index[sw_if_index0] != ~0); + ASSERT (l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0] != ~0); + + next0 = l2pm->tx_next_by_rx_sw_if_index[sw_if_index0]; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = + l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) + { + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + l2_patch_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->rx_sw_if_index = sw_if_index0; + t->tx_sw_if_index = + l2pm->tx_sw_if_index_by_rx_sw_if_index[sw_if_index0]; + } + } + + /* verify speculative enqueue, maybe switch current next frame */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, + to_next, n_left_to_next, + bi0, next0); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + em->counters[node_counter_base_index + L2_PATCH_ERROR_PATCHED] += + frame->n_vectors; + + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (l2_patch_node, static) = { + .function = l2_patch_node_fn, + .name = "l2-patch", + .vector_size = sizeof (u32), + .format_trace = format_l2_patch_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2_patch_error_strings), + .error_strings = l2_patch_error_strings, + + .n_next_nodes = L2_PATCH_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2_PATCH_NEXT_DROP] = "error-drop", + }, +}; +/* *INDENT-ON* */ + +VLIB_NODE_FUNCTION_MULTIARCH (l2_patch_node, l2_patch_node_fn) + int vnet_l2_patch_add_del (u32 rx_sw_if_index, u32 tx_sw_if_index, + int is_add) +{ + l2_patch_main_t *l2pm = &l2_patch_main; + vnet_hw_interface_t *rxhi, *txhi; + u32 tx_next_index; + + /* + * We assume that the API msg handler has used 2x VALIDATE_SW_IF_INDEX + * macros... + */ + + rxhi = vnet_get_sup_hw_interface (l2pm->vnet_main, rx_sw_if_index); + + /* Make sure caller didn't pass a vlan subif, etc. */ + if (rxhi->sw_if_index != rx_sw_if_index) + return VNET_API_ERROR_INVALID_SW_IF_INDEX; + + txhi = vnet_get_sup_hw_interface (l2pm->vnet_main, tx_sw_if_index); + if (txhi->sw_if_index != tx_sw_if_index) + return VNET_API_ERROR_INVALID_SW_IF_INDEX_2; + + if (is_add) + { + tx_next_index = vlib_node_add_next (l2pm->vlib_main, + l2_patch_node.index, + txhi->output_node_index); + + vec_validate_init_empty (l2pm->tx_next_by_rx_sw_if_index, + rx_sw_if_index, ~0); + + l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = tx_next_index; + vec_validate_init_empty (l2pm->tx_sw_if_index_by_rx_sw_if_index, + rx_sw_if_index, ~0); + l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] + = txhi->sw_if_index; + + ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index, + ETHERNET_INTERFACE_FLAG_ACCEPT_ALL); + + vnet_feature_enable_disable ("device-input", "l2-patch", + rxhi->hw_if_index, 1, 0, 0); + } + else + { + ethernet_set_flags (l2pm->vnet_main, rxhi->hw_if_index, + 0 /* disable promiscuous mode */ ); + + vnet_feature_enable_disable ("device-input", "l2-patch", + rxhi->hw_if_index, 0, 0, 0); + if (vec_len (l2pm->tx_next_by_rx_sw_if_index) > rx_sw_if_index) + { + l2pm->tx_next_by_rx_sw_if_index[rx_sw_if_index] = ~0; + l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index] = ~0; + } + } + + return 0; +} + +static clib_error_t * +test_patch_command_fn (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + l2_patch_main_t *l2pm = &l2_patch_main; + unformat_input_t _line_input, *line_input = &_line_input; + u32 rx_sw_if_index, tx_sw_if_index; + int rv; + int rx_set = 0; + int tx_set = 0; + int is_add = 1; + + /* Get a line of input. */ + if (!unformat_user (input, unformat_line_input, line_input)) + return 0; + + while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT) + { + if (unformat (line_input, "rx %U", unformat_vnet_sw_interface, + l2pm->vnet_main, &rx_sw_if_index)) + rx_set = 1; + else if (unformat (line_input, "tx %U", unformat_vnet_sw_interface, + l2pm->vnet_main, &tx_sw_if_index)) + tx_set = 1; + else if (unformat (line_input, "del")) + is_add = 0; + else + break; + } + + if (rx_set == 0) + return clib_error_return (0, "rx interface not set"); + + if (tx_set == 0) + return clib_error_return (0, "tx interface not set"); + + rv = vnet_l2_patch_add_del (rx_sw_if_index, tx_sw_if_index, is_add); + + switch (rv) + { + case 0: + break; + + case VNET_API_ERROR_INVALID_SW_IF_INDEX: + return clib_error_return (0, "rx interface not a physical port"); + + case VNET_API_ERROR_INVALID_SW_IF_INDEX_2: + return clib_error_return (0, "tx interface not a physical port"); + + default: + return clib_error_return + (0, "WARNING: vnet_l2_patch_add_del returned %d", rv); + } + + return 0; +} + +/*? + * Create or delete a Layer 2 patch. + * + * @cliexpar + * @cliexstart{test l2patch rx <intfc> tx <intfc> [del]} + * @cliexend + * @todo This is incomplete. This needs a detailed description and a + * practical example. +?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (test_patch_command, static) = { + .path = "test l2patch", + .short_help = "test l2patch rx <intfc> tx <intfc> [del]", + .function = test_patch_command_fn, +}; +/* *INDENT-ON* */ + +/** Display the contents of the l2patch table. */ +static clib_error_t * +show_l2patch (vlib_main_t * vm, + unformat_input_t * input, vlib_cli_command_t * cmd) +{ + l2_patch_main_t *l2pm = &l2_patch_main; + u32 rx_sw_if_index; + u32 no_entries = 1; + + ASSERT (vec_len (l2pm->tx_next_by_rx_sw_if_index) == + vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index)); + + for (rx_sw_if_index = 0; + rx_sw_if_index < vec_len (l2pm->tx_sw_if_index_by_rx_sw_if_index); + rx_sw_if_index++) + { + u32 tx_sw_if_index = + l2pm->tx_sw_if_index_by_rx_sw_if_index[rx_sw_if_index]; + if (tx_sw_if_index != ~0) + { + no_entries = 0; + vlib_cli_output (vm, "%26U -> %U", + format_vnet_sw_if_index_name, + l2pm->vnet_main, rx_sw_if_index, + format_vnet_sw_if_index_name, + l2pm->vnet_main, tx_sw_if_index); + } + } + + if (no_entries) + vlib_cli_output (vm, "no l2patch entries"); + + return 0; +} + +/*? + * Show Layer 2 patch entries. + * + * @cliexpar + * @cliexstart{show l2patch} + * @cliexend + * @todo This is incomplete. This needs a detailed description and a + * practical example. +?*/ +/* *INDENT-OFF* */ +VLIB_CLI_COMMAND (show_l2patch_cli, static) = { + .path = "show l2patch", + .short_help = "Show l2 interface cross-connect entries", + .function = show_l2patch, +}; +/* *INDENT-ON* */ + +clib_error_t * +l2_patch_init (vlib_main_t * vm) +{ + l2_patch_main_t *mp = &l2_patch_main; + + mp->vlib_main = vm; + mp->vnet_main = vnet_get_main (); + + return 0; +} + +VLIB_INIT_FUNCTION (l2_patch_init); + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |