/* * 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. */ /* * interface_output.c: interface output node * * Copyright (c) 2008 Eliot Dresselhaus * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <vnet/vnet.h> #include <vnet/ip/icmp46_packet.h> #include <vnet/ip/ip4.h> #include <vnet/ip/ip6.h> #include <vnet/udp/udp_packet.h> #include <vnet/feature/feature.h> typedef struct { u32 sw_if_index; u32 flags; u16 gso_size; u8 gso_l4_hdr_sz; u8 data[128 - 3 * sizeof (u32)]; } interface_output_trace_t; #ifndef CLIB_MARCH_VARIANT u8 * format_vnet_interface_output_trace (u8 * s, va_list * va) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); vlib_node_t *node = va_arg (*va, vlib_node_t *); interface_output_trace_t *t = va_arg (*va, interface_output_trace_t *); vnet_main_t *vnm = vnet_get_main (); vnet_sw_interface_t *si; u32 indent; if (t->sw_if_index != (u32) ~ 0) { indent = format_get_indent (s); if (pool_is_free_index (vnm->interface_main.sw_interfaces, t->sw_if_index)) { /* the interface may have been deleted by the time the trace is printed */ s = format (s, "sw_if_index: %d ", t->sw_if_index); } else { si = vnet_get_sw_interface (vnm, t->sw_if_index); s = format (s, "%U ", format_vnet_sw_interface_name, vnm, si, t->flags); } #define _(bit, name, v, x) \ if (v && (t->flags & VNET_BUFFER_F_##name)) \ s = format (s, "%s ", v); foreach_vnet_buffer_flag #undef _ if (t->flags & VNET_BUFFER_F_GSO) { s = format (s, "\n%Ugso_sz %d gso_l4_hdr_sz %d", format_white_space, indent + 2, t->gso_size, t->gso_l4_hdr_sz); } s = format (s, "\n%U%U", format_white_space, indent, node->format_buffer ? node->format_buffer : format_hex_bytes, t->data, sizeof (t->data)); } return s; } static void vnet_interface_output_trace (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, uword n_buffers) { u32 n_left, *from; n_left = n_buffers; from = vlib_frame_vector_args (frame); while (n_left >= 4) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; interface_output_trace_t *t0, *t1; /* Prefetch next iteration. */ vlib_prefetch_buffer_with_index (vm, from[2], LOAD); vlib_prefetch_buffer_with_index (vm, from[3], LOAD); bi0 = from[0]; bi1 = from[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->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; t0->flags = b0->flags; t0->gso_size = vnet_buffer2 (b0)->gso_size; t0->gso_l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz; clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), sizeof (t0->data)); } if (b1->flags & VLIB_BUFFER_IS_TRACED) { t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0])); t1->sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_TX]; t1->flags = b1->flags; t1->gso_size = vnet_buffer2 (b1)->gso_size; t1->gso_l4_hdr_sz = vnet_buffer2 (b1)->gso_l4_hdr_sz; clib_memcpy_fast (t1->data, vlib_buffer_get_current (b1), sizeof (t1->data)); } from += 2; n_left -= 2; } while (n_left >= 1) { u32 bi0; vlib_buffer_t *b0; interface_output_trace_t *t0; bi0 = from[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->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; t0->flags = b0->flags; t0->gso_size = vnet_buffer2 (b0)->gso_size; t0->gso_l4_hdr_sz = vnet_buffer2 (b0)->gso_l4_hdr_sz; clib_memcpy_fast (t0->data, vlib_buffer_get_current (b0), sizeof (t0->data)); } from += 1; n_left -= 1; } } static_always_inline void calc_checksums (vlib_main_t * vm, vlib_buffer_t * b) { tcp_header_t *th; udp_header_t *uh; int is_ip4 = (b->flags & VNET_BUFFER_F_IS_IP4) != 0; int is_ip6 = (b->flags & VNET_BUFFER_F_IS_IP6) != 0; ASSERT (!(is_ip4 && is_ip6)); th = (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset); uh = (udp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset); if (is_ip4) { ip4_header_t *ip4; ip4 = (ip4_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset); if (b->flags & VNET_BUFFER_F_OFFLOAD_IP_CKSUM) ip4->checksum = ip4_header_checksum (ip4); if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) { th->checksum = 0; th->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4); } else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) uh->checksum = ip4_tcp_udp_compute_checksum (vm, b, ip4); } else if (is_ip6) { int bogus; ip6_header_t *ip6; ip6 = (ip6_header_t *) (b->data + vnet_buffer (b)->l3_hdr_offset); if (b->flags & VNET_BUFFER_F_OFFLOAD_TCP_CKSUM) { th->checksum = 0; th->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); } else if (b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) { uh->checksum = 0; uh->checksum = ip6_tcp_udp_icmp_compute_checksum (vm, b, ip6, &bogus); } } b->flags &= ~VNET_BUFFER_F_OFFLOAD_TCP_CKSUM; b->flags &= ~VNET_BUFFER_F_OFFLOAD_UDP_CKSUM; b->flags &= ~VNET_BUFFER_F_OFFLOAD_IP_CKSUM; } static_always_inline u16 tso_alloc_tx_bufs (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd, vlib_buffer_t * b0, u16 l4_hdr_sz) { u32 n_bytes_b0 = vlib_buffer_length_in_chain (vm, b0); u16 gso_size = vnet_buffer2 (b0)->gso_size; u16 l234_sz = vnet_buffer (b0)->l4_hdr_offset + l4_hdr_sz; /* rounded-up division */ u16 n_bufs = (n_bytes_b0 - l234_sz + (gso_size - 1)) / gso_size; u16 n_alloc; ASSERT (n_bufs > 0); vec_validate (ptd->split_buffers, n_bufs - 1); n_alloc = vlib_buffer_alloc (vm, ptd->split_buffers, n_bufs); if (n_alloc < n_bufs) { vlib_buffer_free (vm, ptd->split_buffers, n_alloc); return 0; } return 1; } static_always_inline void tso_init_buf_from_template_base (vlib_buffer_t * nb0, vlib_buffer_t * b0, u32 flags, u16 length) { nb0->current_data = 0; nb0->total_length_not_including_first_buffer = 0; nb0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID | flags; clib_memcpy_fast (&nb0->opaque, &b0->opaque, sizeof (nb0->opaque)); clib_memcpy_fast (nb0->data, b0->data, length); nb0->current_length = length; } static_always_inline void tso_init_buf_from_template (vlib_main_t * vm, vlib_buffer_t * nb0, vlib_buffer_t * b0, u16 template_data_sz, u16 gso_size, u8 ** p_dst_ptr, u16 * p_dst_left, u32 next_tcp_seq, u32 flags) { tso_init_buf_from_template_base (nb0, b0, flags, template_data_sz); *p_dst_left = clib_min (gso_size, vlib_buffer_get_default_data_size (vm) - template_data_sz); *p_dst_ptr = nb0->data + template_data_sz; tcp_header_t *tcp = (tcp_header_t *) (nb0->data + vnet_buffer (nb0)->l4_hdr_offset); tcp->seq_number = clib_host_to_net_u32 (next_tcp_seq); } static_always_inline void tso_fixup_segmented_buf (vlib_buffer_t * b0, u8 tcp_flags, int is_ip6) { u16 l3_hdr_offset = vnet_buffer (b0)->l3_hdr_offset; u16 l4_hdr_offset = vnet_buffer (b0)->l4_hdr_offset; ip4_header_t *ip4 = (ip4_header_t *) (b0->data + l3_hdr_offset); ip6_header_t *ip6 = (ip6_header_t *) (b0->data + l3_hdr_offset); tcp_header_t *tcp = (tcp_header_t *) (b0->data + l4_hdr_offset); tcp->flags = tcp_flags; if (is_ip6) ip6->payload_length = clib_host_to_net_u16 (b0->current_length - vnet_buffer (b0)->l4_hdr_offset); else ip4->length = clib_host_to_net_u16 (b0->current_length - vnet_buffer (b0)->l3_hdr_offset); } /** * Allocate the necessary number of ptd->split_buffers, * and segment the possibly chained buffer(s) from b0 into * there. * * Return the cumulative number of bytes sent or zero * if allocation failed. */ static_always_inline u32 tso_segment_buffer (vlib_main_t * vm, vnet_interface_per_thread_data_t * ptd, int do_tx_offloads, u32 sbi0, vlib_buffer_t * sb0, u32 n_bytes_b0) { u32 n_tx_bytes = 0; int is_ip4 = sb0->flags & VNET_BUFFER_F_IS_IP4; int is_ip6 = sb0->flags & VNET_BUFFER_F_IS_IP6; ASSERT (is_ip4 || is_ip6); ASSERT (sb0->flags & VNET_BUFFER_F_L2_HDR_OFFSET_VALID); ASSERT (sb0->flags & VNET_BUFFER_F_L3_HDR_OFFSET_VALID); ASSERT (sb0->flags & VNET_BUFFER_F_L4_HDR_OFFSET_VALID); u16 gso_size = vnet_buffer2 (sb0)->gso_size; int l4_hdr_sz = vnet_buffer2 (sb0)->gso_l4_hdr_sz; u8 save_tcp_flags = 0; u8 tcp_flags_no_fin_psh = 0; u32 next_tcp_seq = 0; tcp_header_t *tcp = (tcp_header_t *) (sb0->data + vnet_buffer (sb0)->l4_hdr_offset); next_tcp_seq = clib_net_to_host_u32 (tcp->seq_number); /* store original flags for last packet and reset FIN and PSH */ save_tcp_flags = tcp->flags; tcp_flags_no_fin_psh = tcp->flags & ~(TCP_FLAG_FIN | TCP_FLAG_PSH); tcp->checksum = 0; u32 default_bflags = sb0->flags & ~(VNET_BUFFER_F_GSO | VLIB_BUFFER_NEXT_PRESENT); u16 l234_sz = vnet_buffer (sb0)->l4_hdr_offset + l4_hdr_sz; int first_data_size = clib_min (gso_size, sb0->current_length - l234_sz); next_tcp_seq += first_data_size; if (PREDICT_FALSE (!tso_alloc_tx_bufs (vm, ptd, sb0, l4_hdr_sz))) return 0; vlib_buffer_t *b0 = vlib_get_buffer (vm, ptd->split_buffers[0]); tso_init_buf_from_template_base (b0, sb0, default_bflags, l4_hdr_sz + first_data_size); u32 total_src_left = n_bytes_b0 - l234_sz - first_data_size; if (total_src_left) { /* Need to copy more segments */ u8 *src_ptr, *dst_ptr; u16 src_left, dst_left; /* current source buffer */ vlib_buffer_t *csb0 = sb0; u32 csbi0 = sbi0; /* current dest buffer */ vlib_buffer_t *cdb0; u16 dbi = 1; /* the buffer [0] is b0 */ src_ptr = sb0->data + l234_sz + first_data_size; src_left = sb0->current_length - l234_sz - first_data_size; b0->current_length = l234_sz + first_data_size; tso_fixup_segmented_buf (b0, tcp_flags_no_fin_psh, is_ip6); if (do_tx_offloads) calc_checksums (vm, b0); /* grab a second buffer and prepare the loop */ ASSERT (dbi < vec_len (ptd->split_buffers)); cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]); tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr, &dst_left, next_tcp_seq, default_bflags); /* an arbitrary large number to catch the runaway loops */ int nloops = 2000; while (total_src_left) { if (nloops-- <= 0) clib_panic ("infinite loop detected"); u16 bytes_to_copy = clib_min (src_left, dst_left); clib_memcpy_fast (dst_ptr, src_ptr, bytes_to_copy); src_left -= bytes_to_copy; src_ptr += bytes_to_copy; total_src_left -= bytes_to_copy; dst_left -= bytes_to_copy; dst_ptr += bytes_to_copy; next_tcp_seq += bytes_to_copy; cdb0->current_length += bytes_to_copy; if (0 == src_left) { int has_next = (csb0->flags & VLIB_BUFFER_NEXT_PRESENT); u32 next_bi = csb0->next_buffer; /* init src to the next buffer in chain */ if (has_next) { csbi0 = next_bi; csb0 = vlib_get_buffer (vm, csbi0); src_left = csb0->current_length; src_ptr = csb0->data; } else { ASSERT (total_src_left == 0); break; } } if (0 == dst_left && total_src_left) { if (do_tx_offloads) calc_checksums (vm, cdb0); n_tx_bytes += cdb0->current_length; ASSERT (dbi < vec_len (ptd->split_buffers)); cdb0 = vlib_get_buffer (vm, ptd->split_buffers[dbi++]); tso_init_buf_from_template (vm, cdb0, b0, l234_sz, gso_size, &dst_ptr, &dst_left, next_tcp_seq, default_bflags); } } tso_fixup_segmented_buf (cdb0, save_tcp_flags, is_ip6); if (do_tx_offloads) calc_checksums (vm, cdb0); n_tx_bytes += cdb0->current_length; } n_tx_bytes += b0->current_length; return n_tx_bytes; } static_always_inline void drop_one_buffer_and_count (vlib_main_t * vm, vnet_main_t * vnm, vlib_node_runtime_t * node, u32 * pbi0, u32 drop_error_code) { u32 thread_index = vm->thread_index; vnet_interface_output_runtime_t *rt = (void *) node->runtime_data; vlib_simple_counter_main_t *cm; cm = vec_elt_at_index (vnm->interface_main.sw_if_counters, VNET_INTERFACE_COUNTER_TX_ERROR); vlib_increment_simple_counter (cm, thread_index, rt->sw_if_index, 1); vlib_error_drop_buffers (vm, node, pbi0, /* buffer stride */ 1, /* n_buffers */ 1, VNET_INTERFACE_OUTPUT_NEXT_DROP, node->node_index, drop_error_code); } static_always_inline uword vnet_interface_output_node_inline_gso (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, vnet_main_t * vnm, vnet_hw_interface_t * hi, int do_tx_offloads, int do_segmentation) { vnet_interface_output_runtime_t *rt = (void *) node->runtime_data; vnet_sw_interface_t *si; u32 n_left_to_tx, *from, *from_end, *to_tx; u32 n_bytes, n_buffers, n_packets; u32 n_bytes_b0, n_bytes_b1, n_bytes_b2, n_bytes_b3; u32 thread_index = vm->thread_index; vnet_interface_main_t *im = &vnm->interface_main; u32 next_index = VNET_INTERFACE_OUTPUT_NEXT_TX; u32 current_config_index = ~0; u8 arc = im->output_feature_arc_index; vnet_interface_per_thread_data_t *ptd = vec_elt_at_index (im->per_thread_data, thread_index); n_buffers = frame->n_vectors; if (node->flags & VLIB_NODE_FLAG_TRACE) vnet_interface_output_trace (vm, node, frame, n_buffers); from = vlib_frame_vector_args (frame); if (rt->is_deleted) return vlib_error_drop_buffers (vm, node, from, /* buffer stride */ 1, n_buffers, VNET_INTERFACE_OUTPUT_NEXT_DROP, node->node_index, VNET_INTERFACE_OUTPUT_ERROR_INTERFACE_DELETED); si = vnet_get_sw_interface (vnm, rt->sw_if_index); hi = vnet_get_sup_hw_interface (vnm, rt->sw_if_index); if (!(si->flags & (VNET_SW_INTERFACE_FLAG_ADMIN_UP | VNET_SW_INTERFACE_FLAG_BOND_SLAVE)) || !(hi->flags & VNET_HW_INTERFACE_FLAG_LINK_UP)) { vlib_simple_counter_main_t *cm; cm = vec_elt_at_index (vnm->interface_main.sw_if_counters, VNET_INTERFACE_COUNTER_TX_ERROR); vlib_increment_simple_counter (cm, thread_index, rt->sw_if_index, n_buffers); return vlib_error_drop_buffers (vm, node, from, /* buffer stride */ 1, n_buffers, VNET_INTERFACE_OUTPUT_NEXT_DROP, node->node_index, VNET_INTERFACE_OUTPUT_ERROR_INTERFACE_DOWN); } from_end = from + n_buffers; /* Total byte count of all buffers. */ n_bytes = 0; n_packets = 0; /* interface-output feature arc handling */ if (PREDICT_FALSE (vnet_have_features (arc, rt->sw_if_index))) { vnet_feature_config_main_t *fcm; fcm = vnet_feature_get_config_main (arc); current_config_index = vnet_get_feature_config_index (arc, rt->sw_if_index); vnet_get_config_data (&fcm->config_main, ¤t_config_index, &next_index, 0); } while (from < from_end) { /* Get new next frame since previous incomplete frame may have less than VNET_FRAME_SIZE vectors in it. */ vlib_get_new_next_frame (vm, node, next_index, to_tx, n_left_to_tx); while (from + 8 <= from_end && n_left_to_tx >= 4) { u32 bi0, bi1, bi2, bi3; vlib_buffer_t *b0, *b1, *b2, *b3; u32 tx_swif0, tx_swif1, tx_swif2, tx_swif3; u32 or_flags; /* Prefetch next iteration. */ vlib_prefetch_buffer_with_index (vm, from[4], LOAD); vlib_prefetch_buffer_with_index (vm, from[5], LOAD); vlib_prefetch_buffer_with_index (vm, from[6], LOAD); vlib_prefetch_buffer_with_index (vm, from[7], LOAD); bi0 = from[0]; bi1 = from[1]; bi2 = from[2]; bi3 = from[3]; to_tx[0] = bi0; to_tx[1] = bi1; to_tx[2] = bi2; to_tx[3] = bi3; if (!do_segmentation) { from += 4; to_tx += 4; n_left_to_tx -= 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); if (do_segmentation) { or_flags = b0->flags | b1->flags | b2->flags | b3->flags; /* go to single loop if we need TSO segmentation */ if (PREDICT_FALSE (or_flags & VNET_BUFFER_F_GSO)) break; from += 4; to_tx += 4; n_left_to_tx -= 4; } /* Be grumpy about zero length buffers for benefit of driver tx function. */ ASSERT (b0->current_length > 0); ASSERT (b1->current_length > 0); ASSERT (b2->current_length > 0); ASSERT (b3->current_length > 0); n_bytes_b0 = vlib_buffer_length_in_chain (vm, b0); n_bytes_b1 = vlib_buffer_length_in_chain (vm, b1); n_bytes_b2 = vlib_buffer_length_in_chain (vm, b2); n_bytes_b3 = vlib_buffer_length_in_chain (vm, b3); tx_swif0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; tx_swif1 = vnet_buffer (b1)->sw_if_index[VLIB_TX]; tx_swif2 = vnet_buffer (b2)->sw_if_index[VLIB_TX]; tx_swif3 = vnet_buffer (b3)->sw_if_index[VLIB_TX]; n_bytes += n_bytes_b0 + n_bytes_b1; n_bytes += n_bytes_b2 + n_bytes_b3; n_packets += 4; if (PREDICT_FALSE (current_config_index != ~0)) { vnet_buffer (b0)->feature_arc_index = arc; vnet_buffer (b1)->feature_arc_index = arc; vnet_buffer (b2)->feature_arc_index = arc; vnet_buffer (b3)->feature_arc_index = arc; b0->current_config_index = current_config_index; b1->current_config_index = current_config_index; b2->current_config_index = current_config_index; b3->current_config_index = current_config_index; } /* update vlan subif tx counts, if required */ if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index)) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif0, 1, n_bytes_b0); } if (PREDICT_FALSE (tx_swif1 != rt->sw_if_index)) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif1, 1, n_bytes_b1); } if (PREDICT_FALSE (tx_swif2 != rt->sw_if_index)) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif2, 1, n_bytes_b2); } if (PREDICT_FALSE (tx_swif3 != rt->sw_if_index)) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif3, 1, n_bytes_b3); } if (!do_segmentation) or_flags = b0->flags | b1->flags | b2->flags | b3->flags; if (do_tx_offloads) { if (or_flags & (VNET_BUFFER_F_OFFLOAD_TCP_CKSUM | VNET_BUFFER_F_OFFLOAD_UDP_CKSUM | VNET_BUFFER_F_OFFLOAD_IP_CKSUM)) { calc_checksums (vm, b0); calc_checksums (vm, b1); calc_checksums (vm, b2); calc_checksums (vm, b3); } } } while (from + 1 <= from_end && n_left_to_tx >= 1) { u32 bi0; vlib_buffer_t *b0; u32 tx_swif0; bi0 = from[0]; to_tx[0] = bi0; from += 1; to_tx += 1; n_left_to_tx -= 1; b0 = vlib_get_buffer (vm, bi0); /* Be grumpy about zero length buffers for benefit of driver tx function. */ ASSERT (b0->current_length > 0); n_bytes_b0 = vlib_buffer_length_in_chain (vm, b0); tx_swif0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; n_bytes += n_bytes_b0; n_packets += 1; if (PREDICT_FALSE (current_config_index != ~0)) { vnet_buffer (b0)->feature_arc_index = arc; b0->current_config_index = current_config_index; } if (do_segmentation) { if (PREDICT_FALSE (b0->flags & VNET_BUFFER_F_GSO)) { /* * Undo the enqueue of the b0 - it is not going anywhere, * and will be freed either after it's segmented or * when dropped, if there is no buffers to segment into. */ to_tx -= 1; n_left_to_tx += 1; /* undo the counting. */ n_bytes -= n_bytes_b0; n_packets -= 1; u32 n_tx_bytes = 0; n_tx_bytes = tso_segment_buffer (vm, ptd, do_tx_offloads, bi0, b0, n_bytes_b0); if (PREDICT_FALSE (n_tx_bytes == 0)) { drop_one_buffer_and_count (vm, vnm, node, from - 1, VNET_INTERFACE_OUTPUT_ERROR_NO_BUFFERS_FOR_GSO); continue; } u16 n_tx_bufs = vec_len (ptd->split_buffers); u32 *from_tx_seg = ptd->split_buffers; while (n_tx_bufs > 0) { if (n_tx_bufs >= n_left_to_tx) { while (n_left_to_tx > 0) { to_tx[0] = from_tx_seg[0]; to_tx += 1; from_tx_seg += 1; n_left_to_tx -= 1; n_tx_bufs -= 1; n_packets += 1; } vlib_put_next_frame (vm, node, next_index, n_left_to_tx); vlib_get_new_next_frame (vm, node, next_index, to_tx, n_left_to_tx); } else { while (n_tx_bufs > 0) { to_tx[0] = from_tx_seg[0]; to_tx += 1; from_tx_seg += 1; n_left_to_tx -= 1; n_tx_bufs -= 1; n_packets += 1; } } } n_bytes += n_tx_bytes; if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index)) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif0, _vec_len (ptd->split_buffers), n_tx_bytes); } /* The buffers were enqueued. Reset the length */ _vec_len (ptd->split_buffers) = 0; /* Free the now segmented buffer */ vlib_buffer_free_one (vm, bi0); continue; } } if (PREDICT_FALSE (tx_swif0 != rt->sw_if_index)) { vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, tx_swif0, 1, n_bytes_b0); } if (do_tx_offloads) calc_checksums (vm, b0); } vlib_put_next_frame (vm, node, next_index, n_left_to_tx); } /* Update main interface stats. */ vlib_increment_combined_counter (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_TX, thread_index, rt->sw_if_index, n_packets, n_bytes); return n_buffers; } #endif /* CLIB_MARCH_VARIANT */ static_always_inline void vnet_interface_pcap_tx_trace (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int sw_if_index_from_buffer) { u32 n_left_from, *from; u32 sw_if_index; if (PREDICT_TRUE (vm->pcap[VLIB_TX].pcap_enable == 0)) return; if (sw_if_index_from_buffer == 0) { vnet_interface_output_runtime_t *rt = (void *) node->runtime_data; sw_if_index = rt->sw_if_index; } else sw_if_index = ~0; n_left_from = frame->n_vectors; from = vlib_frame_vector_args (frame); while (n_left_from > 0) { u32 bi0 = from[0]; vlib_buffer_t *b0 = vlib_get_buffer (vm, bi0); if (sw_if_index_from_buffer) sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; if (vm->pcap[VLIB_TX].pcap_sw_if_index == 0 || vm->pcap[VLIB_TX].pcap_sw_if_index == sw_if_index) pcap_add_buffer (&vm->pcap[VLIB_TX].pcap_main, vm, bi0, 512); from++; n_left_from--; } } #ifndef CLIB_MARCH_VARIANT static_always_inline uword vnet_interface_output_node_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, vnet_main_t * vnm, vnet_hw_interface_t * hi, int do_tx_offloads) { /* * The 3-headed "if" is here because we want to err on the side * of not impacting the non-GSO performance - so for the more * common case of no GSO interfaces we want to prevent the * segmentation codepath from being there altogether. */ if (PREDICT_TRUE (vnm->interface_main.gso_interface_count == 0)) return vnet_interface_output_node_inline_gso (vm, node, frame, vnm, hi, do_tx_offloads, /* do_segmentation */ 0); else if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_GSO) return vnet_interface_output_node_inline_gso (vm, node, frame, vnm, hi, do_tx_offloads, /* do_segmentation */ 0); else return vnet_interface_output_node_inline_gso (vm, node, frame, vnm, hi, do_tx_offloads, /* do_segmentation */ 1); } uword vnet_interface_output_node (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_main_t *vnm = vnet_get_main (); vnet_hw_interface_t *hi; vnet_interface_output_runtime_t *rt = (void *) node->runtime_data; hi = vnet_get_sup_hw_interface (vnm, rt->sw_if_index); vnet_interface_pcap_tx_trace (vm, node, frame, 0 /* sw_if_index_from_buffer */ ); if (hi->flags & VNET_HW_INTERFACE_FLAG_SUPPORTS_TX_L4_CKSUM_OFFLOAD) return vnet_interface_output_node_inline (vm, node, frame, vnm, hi, /* do_tx_offloads */ 0); else return vnet_interface_output_node_inline (vm, node, frame, vnm, hi, /* do_tx_offloads */ 1); } #endif /* CLIB_MARCH_VARIANT */ /* Use buffer's sw_if_index[VNET_TX] to choose output interface. */ VLIB_NODE_FN (vnet_per_buffer_interface_output_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_main_t *vnm = vnet_get_main (); u32 n_left_to_next, *from, *to_next; u32 n_left_from, next_index; vnet_interface_pcap_tx_trace (vm, node, frame, 1 /* sw_if_index_from_buffer */ ); n_left_from = frame->n_vectors; from = vlib_frame_vector_args (frame); next_index = node->cached_next_index; while (n_left_from > 0) { 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, next0, next1; vlib_buffer_t *b0, *b1; vnet_hw_interface_t *hi0, *hi1; /* Prefetch next iteration. */ vlib_prefetch_buffer_with_index (vm, from[2], LOAD); vlib_prefetch_buffer_with_index (vm, from[3], LOAD); bi0 = from[0]; bi1 = from[1]; to_next[0] = bi0; to_next[1] = bi1; from += 2; to_next += 2; n_left_to_next -= 2; n_left_from -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer (b0)->sw_if_index [VLIB_TX]); hi1 = vnet_get_sup_hw_interface (vnm, vnet_buffer (b1)->sw_if_index [VLIB_TX]); next0 = hi0->output_node_next_index; next1 = hi1->output_node_next_index; 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, next0; vlib_buffer_t *b0; vnet_hw_interface_t *hi0; bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_to_next -= 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); hi0 = vnet_get_sup_hw_interface (vnm, vnet_buffer (b0)->sw_if_index [VLIB_TX]); next0 = hi0->output_node_next_index; 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; } typedef struct vnet_error_trace_t_ { u32 sw_if_index; } vnet_error_trace_t; static u8 * format_vnet_error_trace (u8 * s, va_list * va) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *); vnet_error_trace_t *t = va_arg (*va, vnet_error_trace_t *); s = format (s, "rx:%U", format_vnet_sw_if_index_name, vnet_get_main (), t->sw_if_index); return s; } static void interface_trace_buffers (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; vnet_error_trace_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->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; } if (b1->flags & VLIB_BUFFER_IS_TRACED) { t1 = vlib_add_trace (vm, node, b1, sizeof (t1[0])); t1->sw_if_index = vnet_buffer (b1)->sw_if_index[VLIB_RX]; } buffers += 2; n_left -= 2; } while (n_left >= 1) { u32 bi0; vlib_buffer_t *b0; vnet_error_trace_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->sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_RX]; } buffers += 1; n_left -= 1; } } typedef enum { VNET_ERROR_DISPOSITION_DROP, VNET_ERROR_DISPOSITION_PUNT, VNET_ERROR_N_DISPOSITION, } vnet_error_disposition_t; static_always_inline uword interface_drop_punt (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, vnet_error_disposition_t disposition) { u32 *from, n_left, thread_index, *sw_if_index; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; u32 sw_if_indices[VLIB_FRAME_SIZE]; vlib_simple_counter_main_t *cm; u16 nexts[VLIB_FRAME_SIZE]; vnet_main_t *vnm; vnm = vnet_get_main (); thread_index = vm->thread_index; from = vlib_frame_vector_args (frame); n_left = frame->n_vectors; b = bufs; sw_if_index = sw_if_indices; vlib_get_buffers (vm, from, bufs, n_left); if (node->flags & VLIB_NODE_FLAG_TRACE) interface_trace_buffers (vm, node, frame); /* All going to drop regardless, this is just a counting exercise */ clib_memset (nexts, 0, sizeof (nexts)); cm = vec_elt_at_index (vnm->interface_main.sw_if_counters, (disposition == VNET_ERROR_DISPOSITION_PUNT ? VNET_INTERFACE_COUNTER_PUNT : VNET_INTERFACE_COUNTER_DROP)); /* collect the array of interfaces 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); } sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX]; sw_if_index[1] = vnet_buffer (b[1])->sw_if_index[VLIB_RX]; sw_if_index[2] = vnet_buffer (b[2])->sw_if_index[VLIB_RX]; sw_if_index[3] = vnet_buffer (b[3])->sw_if_index[VLIB_RX]; sw_if_index += 4; n_left -= 4; b += 4; } while (n_left) { sw_if_index[0] = vnet_buffer (b[0])->sw_if_index[VLIB_RX]; sw_if_index += 1; n_left -= 1; b += 1; } /* ... then count against them in blocks */ n_left = frame->n_vectors; while (n_left) { vnet_sw_interface_t *sw_if0; u16 off, count; off = frame->n_vectors - n_left; sw_if_index = sw_if_indices + off; count = clib_count_equal_u32 (sw_if_index, n_left); n_left -= count; vlib_increment_simple_counter (cm, thread_index, sw_if_index[0], count); /* Increment super-interface drop/punt counters for sub-interfaces. */ sw_if0 = vnet_get_sw_interface (vnm, sw_if_index[0]); if (sw_if0->sup_sw_if_index != sw_if_index[0]) vlib_increment_simple_counter (cm, thread_index, sw_if0->sup_sw_if_index, count); } vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors); return frame->n_vectors; } static inline void pcap_drop_trace (vlib_main_t * vm, vnet_interface_main_t * im, vlib_frame_t * f) { u32 *from; u32 n_left = f->n_vectors; vlib_buffer_t *b0, *p1; u32 bi0; i16 save_current_data; u16 save_current_length; from = vlib_frame_vector_args (f); while (n_left > 0) { if (PREDICT_TRUE (n_left > 1)) { p1 = vlib_get_buffer (vm, from[1]); vlib_prefetch_buffer_header (p1, LOAD); } bi0 = from[0]; b0 = vlib_get_buffer (vm, bi0); from++; n_left--; /* See if we're pointedly ignoring this specific error */ if (im->pcap_drop_filter_hash && hash_get (im->pcap_drop_filter_hash, b0->error)) continue; /* Trace all drops, or drops received on a specific interface */ if (im->pcap_sw_if_index == 0 || im->pcap_sw_if_index == vnet_buffer (b0)->sw_if_index[VLIB_RX]) { save_current_data = b0->current_data; save_current_length = b0->current_length; /* * Typically, we'll need to rewind the buffer */ if (b0->current_data > 0) vlib_buffer_advance (b0, (word) - b0->current_data); pcap_add_buffer (&im->pcap_main, vm, bi0, 512); b0->current_data = save_current_data; b0->current_length = save_current_length; } } } #ifndef CLIB_MARCH_VARIANT void vnet_pcap_drop_trace_filter_add_del (u32 error_index, int is_add) { vnet_interface_main_t *im = &vnet_get_main ()->interface_main; if (im->pcap_drop_filter_hash == 0) im->pcap_drop_filter_hash = hash_create (0, sizeof (uword)); if (is_add) hash_set (im->pcap_drop_filter_hash, error_index, 1); else hash_unset (im->pcap_drop_filter_hash, error_index); } #endif /* CLIB_MARCH_VARIANT */ VLIB_NODE_FN (interface_drop) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { vnet_interface_main_t *im = &vnet_get_main ()->interface_main; if (PREDICT_FALSE (im->drop_pcap_enable)) pcap_drop_trace (vm, im, frame); return interface_drop_punt (vm, node, frame, VNET_ERROR_DISPOSITION_DROP); } VLIB_NODE_FN (interface_punt) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return interface_drop_punt (vm, node, frame, VNET_ERROR_DISPOSITION_PUNT); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (interface_drop) = { .name = "error-drop", .vector_size = sizeof (u32), .format_trace = format_vnet_error_trace, .n_next_nodes = 1, .next_nodes = { [0] = "drop", }, }; /* *INDENT-ON* */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (interface_punt) = { .name = "error-punt", .vector_size = sizeof (u32), .format_trace = format_vnet_error_trace, .n_next_nodes = 1, .next_nodes = { [0] = "punt", }, }; /* *INDENT-ON* */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (vnet_per_buffer_interface_output_node) = { .name = "interface-output", .vector_size = sizeof (u32), }; /* *INDENT-ON* */ static uword interface_tx_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { vnet_main_t *vnm = vnet_get_main (); u32 last_sw_if_index = ~0; vlib_frame_t *to_frame = 0; vnet_hw_interface_t *hw = 0; u32 *from, *to_next = 0; u32 n_left_from; from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; while (n_left_from > 0) { u32 bi0; vlib_buffer_t *b0; u32 sw_if_index0; bi0 = from[0]; from++; n_left_from--; b0 = vlib_get_buffer (vm, bi0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; if (PREDICT_FALSE ((last_sw_if_index != sw_if_index0) || to_frame == 0)) { if (to_frame) { hw = vnet_get_sup_hw_interface (vnm, last_sw_if_index); vlib_put_frame_to_node (vm, hw->tx_node_index, to_frame); } last_sw_if_index = sw_if_index0; hw = vnet_get_sup_hw_interface (vnm, sw_if_index0); to_frame = vlib_get_frame_to_node (vm, hw->tx_node_index); to_next = vlib_frame_vector_args (to_frame); } to_next[0] = bi0; to_next++; to_frame->n_vectors++; } vlib_put_frame_to_node (vm, hw->tx_node_index, to_frame); return from_frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (interface_tx, static) = { .function = interface_tx_node_fn, .name = "interface-tx", .vector_size = sizeof (u32), .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VNET_FEATURE_ARC_INIT (interface_output, static) = { .arc_name = "interface-output", .start_nodes = VNET_FEATURES (0), .last_in_arc = "interface-tx", .arc_index_ptr = &vnet_main.interface_main.output_feature_arc_index, }; VNET_FEATURE_INIT (span_tx, static) = { .arc_name = "interface-output", .node_name = "span-output", .runs_before = VNET_FEATURES ("interface-tx"), }; VNET_FEATURE_INIT (ipsec_if_tx, static) = { .arc_name = "interface-output", .node_name = "ipsec-if-output", .runs_before = VNET_FEATURES ("interface-tx"), }; VNET_FEATURE_INIT (interface_tx, static) = { .arc_name = "interface-output", .node_name = "interface-tx", .runs_before = 0, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT clib_error_t * vnet_per_buffer_interface_output_hw_interface_add_del (vnet_main_t * vnm, u32 hw_if_index, u32 is_create) { vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index); u32 next_index; if (hi->output_node_index == 0) return 0; next_index = vlib_node_add_next (vnm->vlib_main, vnet_per_buffer_interface_output_node.index, hi->output_node_index); hi->output_node_next_index = next_index; return 0; } VNET_HW_INTERFACE_ADD_DEL_FUNCTION (vnet_per_buffer_interface_output_hw_interface_add_del); void vnet_set_interface_output_node (vnet_main_t * vnm, u32 hw_if_index, u32 node_index) { ASSERT (node_index); vnet_hw_interface_t *hi = vnet_get_hw_interface (vnm, hw_if_index); u32 next_index = vlib_node_add_next (vnm->vlib_main, vnet_per_buffer_interface_output_node.index, node_index); hi->output_node_next_index = next_index; hi->output_node_index = node_index; } #endif /* CLIB_MARCH_VARIANT */ static clib_error_t * pcap_drop_trace_command_fn (vlib_main_t * vm, unformat_input_t * input, vlib_cli_command_t * cmd) { vnet_main_t *vnm = vnet_get_main (); vnet_interface_main_t *im = &vnm->interface_main; u8 *filename; u32 max; int matched = 0; clib_error_t *error = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "on")) { if (im->drop_pcap_enable == 0) { if (im->pcap_filename == 0) im->pcap_filename = format (0, "/tmp/drop.pcap%c", 0); clib_memset (&im->pcap_main, 0, sizeof (im->pcap_main)); im->pcap_main.file_name = (char *) im->pcap_filename; im->pcap_main.n_packets_to_capture = 100; if (im->pcap_pkts_to_capture) im->pcap_main.n_packets_to_capture = im->pcap_pkts_to_capture; im->pcap_main.packet_type = PCAP_PACKET_TYPE_ethernet; im->drop_pcap_enable = 1; matched = 1; vlib_cli_output (vm, "pcap drop capture on..."); } else { vlib_cli_output (vm, "pcap drop capture already on..."); } matched = 1; } else if (unformat (input, "off")) { matched = 1; if (im->drop_pcap_enable) { vlib_cli_output (vm, "captured %d pkts...", im->pcap_main.n_packets_captured); if (im->pcap_main.n_packets_captured) { im->pcap_main.n_packets_to_capture = im->pcap_main.n_packets_captured; error = pcap_write (&im->pcap_main); if (error) clib_error_report (error); else vlib_cli_output (vm, "saved to %s...", im->pcap_filename); } } else { vlib_cli_output (vm, "pcap drop capture already off..."); } im->drop_pcap_enable = 0; } else if (unformat (input, "max %d", &max)) { im->pcap_pkts_to_capture = max; matched = 1; } else if (unformat (input, "intfc %U", unformat_vnet_sw_interface, vnm, &im->pcap_sw_if_index)) matched = 1; else if (unformat (input, "intfc any")) { im->pcap_sw_if_index = 0; matched = 1; } else if (unformat (input, "file %s", &filename)) { u8 *chroot_filename; /* Brain-police user path input */ if (strstr ((char *) filename, "..") || index ((char *) filename, '/')) { vlib_cli_output (vm, "illegal characters in filename '%s'", filename); continue; } chroot_filename = format (0, "/tmp/%s%c", filename, 0); vec_free (filename); if (im->pcap_filename) vec_free (im->pcap_filename); im->pcap_filename = chroot_filename; im->pcap_main.file_name = (char *) im->pcap_filename; matched = 1; } else if (unformat (input, "status")) { if (im->drop_pcap_enable == 0) { vlib_cli_output (vm, "pcap drop capture is off..."); continue; } vlib_cli_output (vm, "pcap drop capture: %d of %d pkts...", im->pcap_main.n_packets_captured, im->pcap_main.n_packets_to_capture); matched = 1; } else break; } if (matched == 0) return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); return 0; } /* *INDENT-OFF* */ VLIB_CLI_COMMAND (pcap_trace_command, static) = { .path = "pcap drop trace", .short_help = "pcap drop trace on off max <nn> intfc <intfc> file <name> status", .function = pcap_drop_trace_command_fn, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */