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-rw-r--r--src/vnet/l2/l2_patch.c452
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:
+ */