diff options
author | 2016-12-19 23:05:39 +0100 | |
---|---|---|
committer | 2016-12-28 12:25:14 +0100 | |
commit | 7cd468a3d7dee7d6c92f69a0bb7061ae208ec727 (patch) | |
tree | 5de62f8dbd3a752f5a676ca600e43d2652d1ff1a /src/vnet/l2/l2_output.c | |
parent | 696f1adec0df3b8f161862566dd9c86174302658 (diff) |
Reorganize source tree to use single autotools instance
Change-Id: I7b51f88292e057c6443b12224486f2d0c9f8ae23
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'src/vnet/l2/l2_output.c')
-rw-r--r-- | src/vnet/l2/l2_output.c | 708 |
1 files changed, 708 insertions, 0 deletions
diff --git a/src/vnet/l2/l2_output.c b/src/vnet/l2/l2_output.c new file mode 100644 index 00000000..953fcb02 --- /dev/null +++ b/src/vnet/l2/l2_output.c @@ -0,0 +1,708 @@ +/* + * l2_output.c : layer 2 output packet processing + * + * Copyright (c) 2013 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 <vlib/cli.h> + +#include <vppinfra/error.h> +#include <vppinfra/hash.h> +#include <vnet/l2/feat_bitmap.h> +#include <vnet/l2/l2_output.h> + + +/* Feature graph node names */ +static char *l2output_feat_names[] = { +#define _(sym,name) name, + foreach_l2output_feat +#undef _ +}; + +char ** +l2output_get_feat_names (void) +{ + return l2output_feat_names; +} + +l2output_main_t l2output_main; + +typedef struct +{ + /* per-pkt trace data */ + u8 src[6]; + u8 dst[6]; + u32 sw_if_index; +} l2output_trace_t; + +/* packet trace format function */ +static u8 * +format_l2output_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 *); + l2output_trace_t *t = va_arg (*args, l2output_trace_t *); + + s = format (s, "l2-output: sw_if_index %d dst %U src %U", + t->sw_if_index, + format_ethernet_address, t->dst, + format_ethernet_address, t->src); + return s; +} + + +static char *l2output_error_strings[] = { +#define _(sym,string) string, + foreach_l2output_error +#undef _ +}; + +/** + * Check for split horizon violations. + * Return 0 if split horizon check passes, otherwise return non-zero. + * Packets should not be transmitted out an interface with the same + * split-horizon group as the input interface, except if the @c shg is 0 + * in which case the check always passes. + */ +static_always_inline u32 +split_horizon_violation (u8 shg1, u8 shg2) +{ + if (PREDICT_TRUE (shg1 == 0)) + { + return 0; + } + else + { + return shg1 == shg2; + } +} + +static_always_inline void +l2output_vtr (vlib_node_runtime_t * node, l2_output_config_t * config, + u32 feature_bitmap, vlib_buffer_t * b, u32 * next) +{ + if (PREDICT_FALSE (config->out_vtr_flag)) + { + /* Perform pre-vtr EFP filter check if configured */ + if (config->output_vtr.push_and_pop_bytes) + { + /* + * Perform output vlan tag rewrite and the pre-vtr EFP filter check. + * The EFP Filter only needs to be run if there is an output VTR + * configured. The flag for the post-vtr EFP Filter node is used + * to trigger the pre-vtr check as well. + */ + u32 failed1 = (feature_bitmap & L2OUTPUT_FEAT_EFP_FILTER) + && (l2_efp_filter_process (b, &(config->input_vtr))); + u32 failed2 = l2_vtr_process (b, &(config->output_vtr)); + + if (PREDICT_FALSE (failed1 | failed2)) + { + *next = L2OUTPUT_NEXT_DROP; + if (failed2) + { + b->error = node->errors[L2OUTPUT_ERROR_VTR_DROP]; + } + if (failed1) + { + b->error = node->errors[L2OUTPUT_ERROR_EFP_DROP]; + } + } + } + // perform the PBB rewrite + else if (config->output_pbb_vtr.push_and_pop_bytes) + { + u32 failed = l2_pbb_process (b, &(config->output_pbb_vtr)); + if (PREDICT_FALSE (failed)) + { + *next = L2OUTPUT_NEXT_DROP; + b->error = node->errors[L2OUTPUT_ERROR_VTR_DROP]; + } + } + } +} + + +static vlib_node_registration_t l2output_node; + +static uword +l2output_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + l2output_next_t next_index; + l2output_main_t *msm = &l2output_main; + u32 cached_sw_if_index; + u32 cached_next_index; + + /* Invalidate cache */ + cached_sw_if_index = ~0; + cached_next_index = ~0; /* warning be gone */ + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; /* number of packets to process */ + next_index = node->cached_next_index; + + while (n_left_from > 0) + { + u32 n_left_to_next; + + /* get space to enqueue frame to graph node "next_index" */ + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (n_left_from >= 8 && n_left_to_next >= 4) + { + u32 bi0, bi1, bi2, bi3; + vlib_buffer_t *b0, *b1, *b2, *b3; + u32 next0, next1, next2, next3; + u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3; + ethernet_header_t *h0, *h1, *h2, *h3; + l2_output_config_t *config0, *config1, *config2, *config3; + u32 feature_bitmap0, feature_bitmap1; + u32 feature_bitmap2, feature_bitmap3; + + /* Prefetch next iteration. */ + { + vlib_buffer_t *p4, *p5, *p6, *p7; + + p4 = vlib_get_buffer (vm, from[4]); + p5 = vlib_get_buffer (vm, from[5]); + p6 = vlib_get_buffer (vm, from[6]); + p7 = vlib_get_buffer (vm, from[7]); + + /* Prefetch the buffer header for the N+2 loop iteration */ + vlib_prefetch_buffer_header (p4, LOAD); + vlib_prefetch_buffer_header (p5, LOAD); + vlib_prefetch_buffer_header (p6, LOAD); + vlib_prefetch_buffer_header (p7, LOAD); + } + + /* speculatively enqueue b0 and b1 to the current next frame */ + /* bi is "buffer index", b is pointer to the buffer */ + to_next[0] = bi0 = from[0]; + to_next[1] = bi1 = from[1]; + to_next[2] = bi2 = from[2]; + to_next[3] = bi3 = from[3]; + from += 4; + to_next += 4; + n_left_from -= 4; + n_left_to_next -= 4; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + b2 = vlib_get_buffer (vm, bi2); + b3 = vlib_get_buffer (vm, bi3); + + /* TX interface handles */ + sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; + sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX]; + sw_if_index2 = vnet_buffer (b2)->sw_if_index[VLIB_TX]; + sw_if_index3 = vnet_buffer (b3)->sw_if_index[VLIB_TX]; + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) + { + h0 = vlib_buffer_get_current (b0); + h1 = vlib_buffer_get_current (b1); + h2 = vlib_buffer_get_current (b2); + h3 = vlib_buffer_get_current (b3); + if (b0->flags & VLIB_BUFFER_IS_TRACED) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + clib_memcpy (t->src, h0->src_address, 6); + clib_memcpy (t->dst, h0->dst_address, 6); + } + if (b1->flags & VLIB_BUFFER_IS_TRACED) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b1, sizeof (*t)); + t->sw_if_index = sw_if_index1; + clib_memcpy (t->src, h1->src_address, 6); + clib_memcpy (t->dst, h1->dst_address, 6); + } + if (b2->flags & VLIB_BUFFER_IS_TRACED) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b2, sizeof (*t)); + t->sw_if_index = sw_if_index2; + clib_memcpy (t->src, h2->src_address, 6); + clib_memcpy (t->dst, h2->dst_address, 6); + } + if (b3->flags & VLIB_BUFFER_IS_TRACED) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b3, sizeof (*t)); + t->sw_if_index = sw_if_index3; + clib_memcpy (t->src, h3->src_address, 6); + clib_memcpy (t->dst, h3->dst_address, 6); + } + } + + vlib_node_increment_counter (vm, l2output_node.index, + L2OUTPUT_ERROR_L2OUTPUT, 4); + + /* Get config for the output interface */ + config0 = vec_elt_at_index (msm->configs, sw_if_index0); + config1 = vec_elt_at_index (msm->configs, sw_if_index1); + config2 = vec_elt_at_index (msm->configs, sw_if_index2); + config3 = vec_elt_at_index (msm->configs, sw_if_index3); + + /* + * Get features from the config + * TODO: mask out any non-applicable features + */ + feature_bitmap0 = config0->feature_bitmap; + feature_bitmap1 = config1->feature_bitmap; + feature_bitmap2 = config2->feature_bitmap; + feature_bitmap3 = config3->feature_bitmap; + + /* Determine next node */ + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b0, sw_if_index0, feature_bitmap0, &next0); + + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b1, sw_if_index1, feature_bitmap1, &next1); + + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b2, sw_if_index2, feature_bitmap2, &next2); + + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b3, sw_if_index3, feature_bitmap3, &next3); + + l2output_vtr (node, config0, feature_bitmap0, b0, &next0); + l2output_vtr (node, config1, feature_bitmap1, b1, &next1); + l2output_vtr (node, config2, feature_bitmap2, b2, &next2); + l2output_vtr (node, config3, feature_bitmap3, b3, &next3); + + /* + * Perform the split horizon check + * The check can only fail for non-zero shg's + */ + if (PREDICT_FALSE (config0->shg + config1->shg + + config2->shg + config3->shg)) + { + /* one of the checks might fail, check both */ + if (split_horizon_violation + (config0->shg, vnet_buffer (b0)->l2.shg)) + { + next0 = L2OUTPUT_NEXT_DROP; + b0->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + if (split_horizon_violation + (config1->shg, vnet_buffer (b1)->l2.shg)) + { + next1 = L2OUTPUT_NEXT_DROP; + b1->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + if (split_horizon_violation + (config2->shg, vnet_buffer (b2)->l2.shg)) + { + next2 = L2OUTPUT_NEXT_DROP; + b2->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + if (split_horizon_violation + (config3->shg, vnet_buffer (b3)->l2.shg)) + { + next3 = L2OUTPUT_NEXT_DROP; + b3->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + } + + /* verify speculative enqueues, maybe switch current next frame */ + /* if next0==next1==next_index then nothing special needs to be done */ + vlib_validate_buffer_enqueue_x4 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, bi2, bi3, + next0, next1, next2, next3); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + u32 next0; + u32 sw_if_index0; + ethernet_header_t *h0; + l2_output_config_t *config0; + u32 feature_bitmap0; + + /* 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_TX]; + + if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) + && (b0->flags & VLIB_BUFFER_IS_TRACED))) + { + l2output_trace_t *t = + vlib_add_trace (vm, node, b0, sizeof (*t)); + t->sw_if_index = sw_if_index0; + h0 = vlib_buffer_get_current (b0); + clib_memcpy (t->src, h0->src_address, 6); + clib_memcpy (t->dst, h0->dst_address, 6); + } + + vlib_node_increment_counter (vm, l2output_node.index, + L2OUTPUT_ERROR_L2OUTPUT, 1); + + /* Get config for the output interface */ + config0 = vec_elt_at_index (msm->configs, sw_if_index0); + + /* + * Get features from the config + * TODO: mask out any non-applicable features + */ + feature_bitmap0 = config0->feature_bitmap; + + /* Determine next node */ + l2_output_dispatch (msm->vlib_main, + msm->vnet_main, + node, + l2output_node.index, + &cached_sw_if_index, + &cached_next_index, + &msm->next_nodes, + b0, sw_if_index0, feature_bitmap0, &next0); + + l2output_vtr (node, config0, feature_bitmap0, b0, &next0); + + /* Perform the split horizon check */ + if (PREDICT_FALSE + (split_horizon_violation + (config0->shg, vnet_buffer (b0)->l2.shg))) + { + next0 = L2OUTPUT_NEXT_DROP; + b0->error = node->errors[L2OUTPUT_ERROR_SHG_DROP]; + } + + /* 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); + } + + return frame->n_vectors; +} + + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (l2output_node,static) = { + .function = l2output_node_fn, + .name = "l2-output", + .vector_size = sizeof (u32), + .format_trace = format_l2output_trace, + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2output_error_strings), + .error_strings = l2output_error_strings, + + .n_next_nodes = L2OUTPUT_N_NEXT, + + /* edit / add dispositions here */ + .next_nodes = { + [L2OUTPUT_NEXT_DROP] = "error-drop", + [L2OUTPUT_NEXT_BAD_INTF] = "l2-output-bad-intf", + }, +}; +/* *INDENT-ON* */ + + +#define foreach_l2output_bad_intf_error \ +_(DROP, "L2 output to interface not in L2 mode or deleted") + +static char *l2output_bad_intf_error_strings[] = { +#define _(sym,string) string, + foreach_l2output_bad_intf_error +#undef _ +}; + +typedef enum +{ +#define _(sym,str) L2OUTPUT_BAD_INTF_ERROR_##sym, + foreach_l2output_bad_intf_error +#undef _ + L2OUTPUT_BAD_INTF_N_ERROR, +} l2output_bad_intf_error_t; + + +/** + * Output node for interfaces/tunnels which was in L2 mode but were changed + * to L3 mode or possibly deleted thereafter. On changing forwarding mode + * of any tunnel/interface from L2 to L3, its entry in l2_output_main table + * next_nodes.output_node_index_vec[sw_if_index] MUST be set to the value of + * L2OUTPUT_NEXT_BAD_INTF. Thus, if there are stale entries in the L2FIB for + * this sw_if_index, l2-output will send packets for this sw_if_index to the + * l2-output-bad-intf node which just setup the proper drop reason before + * sending packets to the error-drop node to drop the packet. Then, stale L2FIB + * entries for delted tunnels won't cause possible packet or memory corrpution. + */ +static vlib_node_registration_t l2output_bad_intf_node; + +static uword +l2output_bad_intf_node_fn (vlib_main_t * vm, + vlib_node_runtime_t * node, vlib_frame_t * frame) +{ + u32 n_left_from, *from, *to_next; + l2output_next_t next_index = 0; + + from = vlib_frame_vector_args (frame); + n_left_from = frame->n_vectors; /* number of packets to process */ + + while (n_left_from > 0) + { + u32 n_left_to_next; + + /* get space to enqueue frame to graph node "next_index" */ + 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; + + 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); + b0->error = node->errors[L2OUTPUT_BAD_INTF_ERROR_DROP]; + b1->error = node->errors[L2OUTPUT_BAD_INTF_ERROR_DROP]; + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t *b0; + + 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); + b0->error = node->errors[L2OUTPUT_BAD_INTF_ERROR_DROP]; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + return frame->n_vectors; +} + +/* *INDENT-OFF* */ +VLIB_REGISTER_NODE (l2output_bad_intf_node,static) = { + .function = l2output_bad_intf_node_fn, + .name = "l2-output-bad-intf", + .vector_size = sizeof (u32), + .type = VLIB_NODE_TYPE_INTERNAL, + + .n_errors = ARRAY_LEN(l2output_bad_intf_error_strings), + .error_strings = l2output_bad_intf_error_strings, + + .n_next_nodes = 1, + + /* edit / add dispositions here */ + .next_nodes = { + [0] = "error-drop", + }, +}; +/* *INDENT-ON* */ + + +VLIB_NODE_FUNCTION_MULTIARCH (l2output_node, l2output_node_fn) + clib_error_t *l2output_init (vlib_main_t * vm) +{ + l2output_main_t *mp = &l2output_main; + + mp->vlib_main = vm; + mp->vnet_main = vnet_get_main (); + + /* Create the config vector */ + vec_validate (mp->configs, 100); + /* Until we hook up the CLI config, just create 100 sw interface entries and zero them */ + + /* Initialize the feature next-node indexes */ + feat_bitmap_init_next_nodes (vm, + l2output_node.index, + L2OUTPUT_N_FEAT, + l2output_get_feat_names (), + mp->next_nodes.feat_next_node_index); + + /* Initialize the output node mapping table */ + l2output_init_output_node_vec (&mp->next_nodes.output_node_index_vec); + + return 0; +} + +VLIB_INIT_FUNCTION (l2output_init); + +typedef struct +{ + u32 node_index; + u32 sw_if_index; +} output_node_mapping_rpc_args_t; + +static void output_node_rpc_callback (output_node_mapping_rpc_args_t * a); + +static void +output_node_mapping_send_rpc (u32 node_index, u32 sw_if_index) +{ + output_node_mapping_rpc_args_t args; + void vl_api_rpc_call_main_thread (void *fp, u8 * data, u32 data_length); + + args.node_index = node_index; + args.sw_if_index = sw_if_index; + + vl_api_rpc_call_main_thread (output_node_rpc_callback, + (u8 *) & args, sizeof (args)); +} + + +/** Create a mapping in the next node mapping table for the given sw_if_index. */ +u32 +l2output_create_output_node_mapping (vlib_main_t * vlib_main, vnet_main_t * vnet_main, u32 node_index, /* index of current node */ + u32 * output_node_index_vec, + u32 sw_if_index) +{ + + u32 next; /* index of next graph node */ + vnet_hw_interface_t *hw0; + u32 *node; + + hw0 = vnet_get_sup_hw_interface (vnet_main, sw_if_index); + + uword cpu_number; + + cpu_number = os_get_cpu_number (); + + if (cpu_number) + { + u32 oldflags; + + oldflags = __sync_fetch_and_or (&hw0->flags, + VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED); + + if ((oldflags & VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED)) + return L2OUTPUT_NEXT_DROP; + + output_node_mapping_send_rpc (node_index, sw_if_index); + return L2OUTPUT_NEXT_DROP; + } + + /* dynamically create graph node arc */ + next = vlib_node_add_next (vlib_main, node_index, hw0->output_node_index); + + /* Initialize vector with the mapping */ + + node = vec_elt_at_index (output_node_index_vec, sw_if_index); + *node = next; + + /* reset mapping bit, includes memory barrier */ + __sync_fetch_and_and (&hw0->flags, ~VNET_HW_INTERFACE_FLAG_L2OUTPUT_MAPPED); + + return next; +} + +void +output_node_rpc_callback (output_node_mapping_rpc_args_t * a) +{ + vlib_main_t *vm = vlib_get_main (); + vnet_main_t *vnm = vnet_get_main (); + l2output_main_t *mp = &l2output_main; + + (void) l2output_create_output_node_mapping + (vm, vnm, a->node_index, mp->next_nodes.output_node_index_vec, + a->sw_if_index); +} + +/* Get a pointer to the config for the given interface */ +l2_output_config_t * +l2output_intf_config (u32 sw_if_index) +{ + l2output_main_t *mp = &l2output_main; + + vec_validate (mp->configs, sw_if_index); + return vec_elt_at_index (mp->configs, sw_if_index); +} + +/** Enable (or disable) the feature in the bitmap for the given interface. */ +void +l2output_intf_bitmap_enable (u32 sw_if_index, u32 feature_bitmap, u32 enable) +{ + l2output_main_t *mp = &l2output_main; + l2_output_config_t *config; + + vec_validate (mp->configs, sw_if_index); + config = vec_elt_at_index (mp->configs, sw_if_index); + + if (enable) + { + config->feature_bitmap |= feature_bitmap; + } + else + { + config->feature_bitmap &= ~feature_bitmap; + } +} + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |