2 *------------------------------------------------------------------
3 * Copyright (c) 2016 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
21 #include <sys/ioctl.h>
24 #include <vlib/vlib.h>
25 #include <vlib/unix/unix.h>
26 #include <vnet/ethernet/ethernet.h>
27 #include <vnet/devices/devices.h>
28 #include <vnet/feature/feature.h>
30 #include <memif/memif.h>
32 #define foreach_memif_input_error
36 #define _(f,s) MEMIF_INPUT_ERROR_##f,
37 foreach_memif_input_error
40 } memif_input_error_t;
42 static char *memif_input_error_strings[] = {
44 foreach_memif_input_error
53 } memif_input_trace_t;
56 format_memif_input_trace (u8 * s, va_list * args)
58 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
59 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
60 memif_input_trace_t *t = va_arg (*args, memif_input_trace_t *);
61 uword indent = format_get_indent (s);
63 s = format (s, "memif: hw_if_index %d next-index %d",
64 t->hw_if_index, t->next_index);
65 s = format (s, "\n%Uslot: ring %u", format_white_space, indent + 2,
70 static_always_inline void
71 memif_prefetch (vlib_main_t * vm, u32 bi)
73 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
74 vlib_prefetch_buffer_header (b, STORE);
75 CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, STORE);
78 static_always_inline uword
79 memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
80 vlib_frame_t * frame, memif_if_t * mif,
81 memif_ring_type_t type)
83 vnet_main_t *vnm = vnet_get_main ();
84 u8 rid = 0; /* Ring id */
85 memif_ring_t *ring = memif_get_ring (mif, type, rid);
86 memif_ring_data_t *rd =
87 vec_elt_at_index (mif->ring_data, rid + type * mif->num_s2m_rings);
90 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
91 uword n_trace = vlib_get_trace_count (vm, node);
92 memif_main_t *nm = &memif_main;
97 u32 thread_index = vlib_get_thread_index ();
99 vlib_buffer_t *b0, *b1;
100 u16 ring_size = 1 << mif->log2_ring_size;
101 u16 mask = ring_size - 1;
105 if (mif->per_interface_next_index != ~0)
106 next_index = mif->per_interface_next_index;
108 n_free_bufs = vec_len (nm->rx_buffers[thread_index]);
109 if (PREDICT_FALSE (n_free_bufs < ring_size))
111 vec_validate (nm->rx_buffers[thread_index],
112 ring_size + n_free_bufs - 1);
114 vlib_buffer_alloc (vm, &nm->rx_buffers[thread_index][n_free_bufs],
116 _vec_len (nm->rx_buffers[thread_index]) = n_free_bufs;
120 if (head == rd->last_head)
123 if (head > rd->last_head)
124 num_slots = head - rd->last_head;
126 num_slots = ring_size - rd->last_head + head;
131 u32 next0 = next_index;
132 u32 next1 = next_index;
133 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
135 while (num_slots > 5 && n_left_to_next > 2)
137 if (PREDICT_TRUE (rd->last_head + 5 < ring_size))
139 CLIB_PREFETCH (memif_get_buffer (mif, ring, rd->last_head + 2),
140 CLIB_CACHE_LINE_BYTES, LOAD);
141 CLIB_PREFETCH (memif_get_buffer (mif, ring, rd->last_head + 3),
142 CLIB_CACHE_LINE_BYTES, LOAD);
143 CLIB_PREFETCH (&ring->desc[rd->last_head + 4],
144 CLIB_CACHE_LINE_BYTES, LOAD);
145 CLIB_PREFETCH (&ring->desc[rd->last_head + 5],
146 CLIB_CACHE_LINE_BYTES, LOAD);
150 CLIB_PREFETCH (memif_get_buffer
151 (mif, ring, (rd->last_head + 2) % mask),
152 CLIB_CACHE_LINE_BYTES, LOAD);
153 CLIB_PREFETCH (memif_get_buffer
154 (mif, ring, (rd->last_head + 3) % mask),
155 CLIB_CACHE_LINE_BYTES, LOAD);
156 CLIB_PREFETCH (&ring->desc[(rd->last_head + 4) % mask],
157 CLIB_CACHE_LINE_BYTES, LOAD);
158 CLIB_PREFETCH (&ring->desc[(rd->last_head + 5) % mask],
159 CLIB_CACHE_LINE_BYTES, LOAD);
161 /* get empty buffer */
162 u32 last_buf = vec_len (nm->rx_buffers[thread_index]) - 1;
163 bi0 = nm->rx_buffers[thread_index][last_buf];
164 bi1 = nm->rx_buffers[thread_index][last_buf - 1];
165 _vec_len (nm->rx_buffers[thread_index]) -= 2;
169 memif_prefetch (vm, nm->rx_buffers[thread_index][last_buf - 2]);
170 memif_prefetch (vm, nm->rx_buffers[thread_index][last_buf - 3]);
179 /* fill buffer metadata */
180 b0 = vlib_get_buffer (vm, bi0);
181 b1 = vlib_get_buffer (vm, bi1);
183 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
184 vnet_buffer (b1)->sw_if_index[VLIB_RX] = mif->sw_if_index;
186 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
187 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
190 mb0 = memif_get_buffer (mif, ring, rd->last_head);
191 clib_memcpy (vlib_buffer_get_current (b0), mb0,
192 CLIB_CACHE_LINE_BYTES);
193 b0->current_length = ring->desc[rd->last_head].length;
194 rd->last_head = (rd->last_head + 1) & mask;
196 mb1 = memif_get_buffer (mif, ring, rd->last_head);
197 clib_memcpy (vlib_buffer_get_current (b1), mb1,
198 CLIB_CACHE_LINE_BYTES);
199 b1->current_length = ring->desc[rd->last_head].length;
200 rd->last_head = (rd->last_head + 1) & mask;
202 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
203 clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
204 mb0 + CLIB_CACHE_LINE_BYTES,
205 b0->current_length - CLIB_CACHE_LINE_BYTES);
207 if (b1->current_length > CLIB_CACHE_LINE_BYTES)
208 clib_memcpy (vlib_buffer_get_current (b1) + CLIB_CACHE_LINE_BYTES,
209 mb1 + CLIB_CACHE_LINE_BYTES,
210 b1->current_length - CLIB_CACHE_LINE_BYTES);
213 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
214 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
216 if (PREDICT_FALSE (n_trace > 0))
219 memif_input_trace_t *tr;
220 vlib_trace_buffer (vm, node, next0, b0,
221 /* follow_chain */ 0);
222 vlib_set_trace_count (vm, node, --n_trace);
223 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
224 tr->next_index = next0;
225 tr->hw_if_index = mif->hw_if_index;
231 memif_input_trace_t *tr;
232 vlib_trace_buffer (vm, node, next1, b1,
233 /* follow_chain */ 0);
234 vlib_set_trace_count (vm, node, --n_trace);
235 tr = vlib_add_trace (vm, node, b1, sizeof (*tr));
236 tr->next_index = next1;
237 tr->hw_if_index = mif->hw_if_index;
242 /* redirect if feature path enabled */
243 vnet_feature_start_device_input_x2 (mif->sw_if_index,
244 &next0, &next1, b0, b1);
247 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
249 bi0, bi1, next0, next1);
254 n_rx_bytes += b0->current_length;
255 n_rx_bytes += b1->current_length;
257 while (num_slots && n_left_to_next)
259 /* get empty buffer */
260 u32 last_buf = vec_len (nm->rx_buffers[thread_index]) - 1;
261 bi0 = nm->rx_buffers[thread_index][last_buf];
262 _vec_len (nm->rx_buffers[thread_index]) = last_buf;
269 /* fill buffer metadata */
270 b0 = vlib_get_buffer (vm, bi0);
271 b0->current_length = ring->desc[rd->last_head].length;
272 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
273 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
276 mb0 = memif_get_buffer (mif, ring, rd->last_head);
277 clib_memcpy (vlib_buffer_get_current (b0), mb0,
278 CLIB_CACHE_LINE_BYTES);
279 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
280 clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
281 mb0 + CLIB_CACHE_LINE_BYTES,
282 b0->current_length - CLIB_CACHE_LINE_BYTES);
285 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
287 if (PREDICT_FALSE (n_trace > 0))
289 memif_input_trace_t *tr;
290 vlib_trace_buffer (vm, node, next0, b0,
291 /* follow_chain */ 0);
292 vlib_set_trace_count (vm, node, --n_trace);
293 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
294 tr->next_index = next0;
295 tr->hw_if_index = mif->hw_if_index;
300 /* redirect if feature path enabled */
301 vnet_feature_start_device_input_x1 (mif->sw_if_index, &next0, b0);
304 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
305 n_left_to_next, bi0, next0);
308 rd->last_head = (rd->last_head + 1) & mask;
311 n_rx_bytes += b0->current_length;
313 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
315 CLIB_MEMORY_STORE_BARRIER ();
318 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
319 + VNET_INTERFACE_COUNTER_RX, thread_index,
320 mif->hw_if_index, n_rx_packets,
327 memif_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
328 vlib_frame_t * frame)
330 u32 n_rx_packets = 0;
331 u32 thread_index = vlib_get_thread_index ();
332 memif_main_t *nm = &memif_main;
336 pool_foreach (mif, nm->interfaces,
338 if (mif->flags & MEMIF_IF_FLAG_ADMIN_UP &&
339 mif->flags & MEMIF_IF_FLAG_CONNECTED &&
340 (mif->if_index % nm->input_cpu_count) ==
341 (thread_index - nm->input_cpu_first_index))
343 if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
345 memif_device_input_inline (vm, node, frame, mif,
349 memif_device_input_inline (vm, node, frame, mif,
359 VLIB_REGISTER_NODE (memif_input_node) = {
360 .function = memif_input_fn,
361 .name = "memif-input",
362 .sibling_of = "device-input",
363 .format_trace = format_memif_input_trace,
364 .type = VLIB_NODE_TYPE_INPUT,
365 .state = VLIB_NODE_STATE_INTERRUPT,
366 .n_errors = MEMIF_INPUT_N_ERROR,
367 .error_strings = memif_input_error_strings,
370 VLIB_NODE_FUNCTION_MULTIARCH (memif_input_node, memif_input_fn)
375 * fd.io coding-style-patch-verification: ON
378 * eval: (c-set-style "gnu")