diff options
Diffstat (limited to 'hicn-plugin/src/data_fwd.h')
| -rwxr-xr-x | hicn-plugin/src/data_fwd.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/hicn-plugin/src/data_fwd.h b/hicn-plugin/src/data_fwd.h new file mode 100755 index 000000000..7390382ef --- /dev/null +++ b/hicn-plugin/src/data_fwd.h @@ -0,0 +1,209 @@ +/* + * Copyright (c) 2017-2019 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. + */ + +#ifndef __HICN_DATA_FWD_H__ +#define __HICN_DATA_FWD_H__ + +#include <vlib/buffer.h> + +#include "pcs.h" + +/* + * Node context data; we think this is per-thread/instance + */ +typedef struct hicn_data_fwd_runtime_s +{ + vlib_combined_counter_main_t repm_counters; + + /* per-cpu vector of cloned packets */ + u32 **clones; +} hicn_data_fwd_runtime_t; + +/* Trace context struct */ +typedef struct +{ + u32 next_index; + u32 sw_if_index; + u8 pkt_type; + u8 packet_data[64]; +} hicn_data_fwd_trace_t; + +typedef enum +{ + HICN_DATA_FWD_NEXT_V4_LOOKUP, + HICN_DATA_FWD_NEXT_V6_LOOKUP, + HICN_DATA_FWD_NEXT_ERROR_DROP, + HICN_DATA_FWD_N_NEXT, +} hicn_data_fwd_next_t; + +/** + *@brief Create a maximum of 256 clones of buffer and store them + * in the supplied array. Unlike the original function in the vlib + * library, we don't prevent cloning if n_buffer==1 and if + * s->current_length <= head_end_offset + CLIB_CACHE_LINE_BYTES * 2. + * + * @param vm - (vlib_main_t *) vlib main data structure pointer + * @param src_buffer - (u32) source buffer index + * @param buffers - (u32 * ) buffer index array + * @param n_buffers - (u16) number of buffer clones requested (<=256) + * @param head_end_offset - (u16) offset relative to current position + * where packet head ends + * @return - (u16) number of buffers actually cloned, may be + * less than the number requested or zero + */ +always_inline u16 +vlib_buffer_clone_256_2 (vlib_main_t * vm, u32 src_buffer, u32 * buffers, + u16 n_buffers, u16 head_end_offset) +{ + u16 i; + vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer); + + ASSERT (n_buffers); + ASSERT (n_buffers <= 256); + + if (s->current_length <= CLIB_CACHE_LINE_BYTES * 2) + { + for (i = 0; i < n_buffers; i++) + { + vlib_buffer_t *d; + d = vlib_buffer_copy (vm, s); + clib_memcpy (d->opaque2, s->opaque2, sizeof (s->opaque2)); + if (d == 0) + return i; + buffers[i] = vlib_get_buffer_index (vm, d); + } + s->current_data += head_end_offset; + s->current_length -= head_end_offset; + return n_buffers; + } + n_buffers = vlib_buffer_alloc_from_free_list (vm, buffers, n_buffers, + vlib_buffer_get_free_list_index + (s)); + + for (i = 0; i < n_buffers; i++) + { + vlib_buffer_t *d = vlib_get_buffer (vm, buffers[i]); + d->current_data = s->current_data; + d->current_length = head_end_offset; + d->trace_index = s->trace_index; + vlib_buffer_set_free_list_index (d, + vlib_buffer_get_free_list_index (s)); + + d->total_length_not_including_first_buffer = s->current_length - + head_end_offset; + if (PREDICT_FALSE (s->flags & VLIB_BUFFER_NEXT_PRESENT)) + { + d->total_length_not_including_first_buffer += + s->total_length_not_including_first_buffer; + } + d->flags = s->flags | VLIB_BUFFER_NEXT_PRESENT; + d->flags &= ~VLIB_BUFFER_EXT_HDR_VALID; + clib_memcpy (d->opaque, s->opaque, sizeof (s->opaque)); + clib_memcpy (d->opaque2, s->opaque2, sizeof (s->opaque2)); + clib_memcpy (vlib_buffer_get_current (d), vlib_buffer_get_current (s), + head_end_offset); + d->next_buffer = src_buffer; + } + vlib_buffer_advance (s, head_end_offset); + s->n_add_refs = n_buffers - 1; + while (s->flags & VLIB_BUFFER_NEXT_PRESENT) + { + s = vlib_get_buffer (vm, s->next_buffer); + s->n_add_refs = n_buffers - 1; + } + + return n_buffers; +} + +/** + * @brief Create multiple clones of buffer and store them + * in the supplied array. Unlike the function in the vlib library, + * we allow src_buffer to have n_add_refs != 0. + * + * @param vm - (vlib_main_t *) vlib main data structure pointer + * @param src_buffer - (u32) source buffer index + * @param buffers - (u32 * ) buffer index array + * @param n_buffers - (u16) number of buffer clones requested (<=256) + * @param head_end_offset - (u16) offset relative to current position + * where packet head ends + * @return - (u16) number of buffers actually cloned, may be + * less than the number requested or zero + */ +always_inline u16 +vlib_buffer_clone2 (vlib_main_t * vm, u32 src_buffer, u32 * buffers, + u16 n_buffers, u16 head_end_offset) +{ + ASSERT (head_end_offset >= VLIB_BUFFER_MIN_CHAIN_SEG_SIZE); + + vlib_buffer_t *s = vlib_get_buffer (vm, src_buffer); + + /* + * total_length_not_including_first_buffer is not initialized to 0 + * when a buffer is used. + */ + if (PREDICT_TRUE (s->next_buffer == 0)) + s->total_length_not_including_first_buffer = 0; + + u16 n_cloned = 0; + u8 n_clone_src = 255 - s->n_add_refs; + + /* + * We need to copy src for all the clones that cannot be chained in + * the src_buffer + */ + /* MAX(n_add_refs) = 256 */ + if (n_buffers > n_clone_src) + { + vlib_buffer_t *copy; + /* Ok to call the original vlib_buffer_copy. */ + copy = vlib_buffer_copy (vm, s); + n_cloned += vlib_buffer_clone (vm, + vlib_get_buffer_index (vm, copy), + buffers, + n_buffers - n_clone_src, + head_end_offset); + n_buffers -= n_cloned; + } + /* + * vlib_buffer_clone_256 check if n_add_refs is 0. We force it to be + * 0 before calling the function and we retore it to the right value + * after the function has been called + */ + u8 tmp_n_add_refs = s->n_add_refs; + + s->n_add_refs = 0; + /* + * The regular vlib_buffer_clone_256 does copy if we need to clone + * only one packet. While this is not a problem per se, it adds + * complexity to the code, especially because we need to add 1 to + * n_add_refs when the packet is cloned. + */ + n_cloned += vlib_buffer_clone_256_2 (vm, + src_buffer, + (buffers + n_cloned), + n_buffers, head_end_offset); + + s->n_add_refs += tmp_n_add_refs; + + return n_cloned; +} + +#endif /* //__HICN_DATA_FWD_H__ */ + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: eval: (c-set-style "gnu") End: + */ |