/* * Copyright (c) 2018 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. */ /** * @file * @brief NAT44 worker handoff */ #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vnet/handoff.h> #include <vnet/fib/ip4_fib.h> #include <vppinfra/error.h> #include <nat/nat.h> #include <nat/nat_inlines.h> typedef struct { u32 next_worker_index; u32 trace_index; u8 in2out; u8 output; } nat44_handoff_trace_t; #define foreach_nat44_handoff_error \ _ (CONGESTION_DROP, "congestion drop") \ _ (SAME_WORKER, "same worker") \ _ (DO_HANDOFF, "do handoff") typedef enum { #define _(sym, str) NAT44_HANDOFF_ERROR_##sym, foreach_nat44_handoff_error #undef _ NAT44_HANDOFF_N_ERROR, } nat44_handoff_error_t; static char *nat44_handoff_error_strings[] = { #define _(sym,string) string, foreach_nat44_handoff_error #undef _ }; static u8 * format_nat44_handoff_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 *); nat44_handoff_trace_t *t = va_arg (*args, nat44_handoff_trace_t *); char *tag, *output; tag = t->in2out ? "IN2OUT" : "OUT2IN"; output = t->output ? "OUTPUT-FEATURE" : ""; s = format (s, "NAT44_%s_WORKER_HANDOFF %s: next-worker %d trace index %d", tag, output, t->next_worker_index, t->trace_index); return s; } static inline uword nat44_worker_handoff_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, u8 is_output, u8 is_in2out) { u32 n_enq, n_left_from, *from, do_handoff = 0, same_worker = 0; u16 thread_indices[VLIB_FRAME_SIZE], *ti = thread_indices; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; snat_main_t *sm = &snat_main; u32 fq_index, thread_index = vm->thread_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; vlib_get_buffers (vm, from, b, n_left_from); if (is_in2out) { fq_index = is_output ? sm->fq_in2out_output_index : sm->fq_in2out_index; } else { fq_index = sm->fq_out2in_index; } while (n_left_from >= 4) { u32 arc_next0, arc_next1, arc_next2, arc_next3; u32 sw_if_index0, sw_if_index1, sw_if_index2, sw_if_index3; u32 rx_fib_index0, rx_fib_index1, rx_fib_index2, rx_fib_index3; u32 iph_offset0 = 0, iph_offset1 = 0, iph_offset2 = 0, iph_offset3 = 0; ip4_header_t *ip0, *ip1, *ip2, *ip3; if (PREDICT_TRUE (n_left_from >= 8)) { 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); CLIB_PREFETCH (&b[4]->data, CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (&b[5]->data, CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (&b[6]->data, CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (&b[7]->data, CLIB_CACHE_LINE_BYTES, LOAD); } if (is_output) { iph_offset0 = vnet_buffer (b[0])->ip.save_rewrite_length; iph_offset1 = vnet_buffer (b[1])->ip.save_rewrite_length; iph_offset2 = vnet_buffer (b[2])->ip.save_rewrite_length; iph_offset3 = vnet_buffer (b[3])->ip.save_rewrite_length; } ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b[0]) + iph_offset0); ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b[1]) + iph_offset1); ip2 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b[2]) + iph_offset2); ip3 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b[3]) + iph_offset3); vnet_feature_next (&arc_next0, b[0]); vnet_feature_next (&arc_next1, b[1]); vnet_feature_next (&arc_next2, b[2]); vnet_feature_next (&arc_next3, b[3]); vnet_buffer2 (b[0])->nat.arc_next = arc_next0; vnet_buffer2 (b[1])->nat.arc_next = arc_next1; vnet_buffer2 (b[2])->nat.arc_next = arc_next2; vnet_buffer2 (b[3])->nat.arc_next = arc_next3; sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX]; sw_if_index1 = vnet_buffer (b[1])->sw_if_index[VLIB_RX]; sw_if_index2 = vnet_buffer (b[2])->sw_if_index[VLIB_RX]; sw_if_index3 = vnet_buffer (b[3])->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); rx_fib_index1 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index1); rx_fib_index2 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index2); rx_fib_index3 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index3); if (is_in2out) { ti[0] = sm->worker_in2out_cb (ip0, rx_fib_index0, is_output); ti[1] = sm->worker_in2out_cb (ip1, rx_fib_index1, is_output); ti[2] = sm->worker_in2out_cb (ip2, rx_fib_index2, is_output); ti[3] = sm->worker_in2out_cb (ip3, rx_fib_index3, is_output); } else { ti[0] = sm->worker_out2in_cb (b[0], ip0, rx_fib_index0, is_output); ti[1] = sm->worker_out2in_cb (b[1], ip1, rx_fib_index1, is_output); ti[2] = sm->worker_out2in_cb (b[2], ip2, rx_fib_index2, is_output); ti[3] = sm->worker_out2in_cb (b[3], ip3, rx_fib_index3, is_output); } if (ti[0] == thread_index) same_worker++; else do_handoff++; if (ti[1] == thread_index) same_worker++; else do_handoff++; if (ti[2] == thread_index) same_worker++; else do_handoff++; if (ti[3] == thread_index) same_worker++; else do_handoff++; b += 4; ti += 4; n_left_from -= 4; } while (n_left_from > 0) { u32 arc_next0; u32 sw_if_index0; u32 rx_fib_index0; u32 iph_offset0 = 0; ip4_header_t *ip0; if (is_output) iph_offset0 = vnet_buffer (b[0])->ip.save_rewrite_length; ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b[0]) + iph_offset0); vnet_feature_next (&arc_next0, b[0]); vnet_buffer2 (b[0])->nat.arc_next = arc_next0; sw_if_index0 = vnet_buffer (b[0])->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); if (is_in2out) { ti[0] = sm->worker_in2out_cb (ip0, rx_fib_index0, is_output); } else { ti[0] = sm->worker_out2in_cb (b[0], ip0, rx_fib_index0, is_output); } if (ti[0] == thread_index) same_worker++; else do_handoff++; b += 1; ti += 1; n_left_from -= 1; } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE))) { u32 i; b = bufs; ti = thread_indices; for (i = 0; i < frame->n_vectors; i++) { if (b[0]->flags & VLIB_BUFFER_IS_TRACED) { nat44_handoff_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); t->next_worker_index = ti[0]; t->trace_index = vlib_buffer_get_trace_index (b[0]); t->in2out = is_in2out; t->output = is_output; b += 1; ti += 1; } else break; } } n_enq = vlib_buffer_enqueue_to_thread (vm, fq_index, from, thread_indices, frame->n_vectors, 1); if (n_enq < frame->n_vectors) { vlib_node_increment_counter (vm, node->node_index, NAT44_HANDOFF_ERROR_CONGESTION_DROP, frame->n_vectors - n_enq); } vlib_node_increment_counter (vm, node->node_index, NAT44_HANDOFF_ERROR_SAME_WORKER, same_worker); vlib_node_increment_counter (vm, node->node_index, NAT44_HANDOFF_ERROR_DO_HANDOFF, do_handoff); return frame->n_vectors; } VLIB_NODE_FN (snat_in2out_worker_handoff_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_worker_handoff_fn_inline (vm, node, frame, 0, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_worker_handoff_node) = { .name = "nat44-in2out-worker-handoff", .vector_size = sizeof (u32), .sibling_of = "nat-default", .format_trace = format_nat44_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_handoff_error_strings), .error_strings = nat44_handoff_error_strings, }; /* *INDENT-ON* */ VLIB_NODE_FN (snat_in2out_output_worker_handoff_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_worker_handoff_fn_inline (vm, node, frame, 1, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_output_worker_handoff_node) = { .name = "nat44-in2out-output-worker-handoff", .vector_size = sizeof (u32), .sibling_of = "nat-default", .format_trace = format_nat44_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_handoff_error_strings), .error_strings = nat44_handoff_error_strings, }; /* *INDENT-ON* */ VLIB_NODE_FN (snat_out2in_worker_handoff_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_worker_handoff_fn_inline (vm, node, frame, 0, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_out2in_worker_handoff_node) = { .name = "nat44-out2in-worker-handoff", .vector_size = sizeof (u32), .sibling_of = "nat-default", .format_trace = format_nat44_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_handoff_error_strings), .error_strings = nat44_handoff_error_strings, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */