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>
31 #include <memif/private.h>
33 #define foreach_memif_input_error
37 #define _(f,s) MEMIF_INPUT_ERROR_##f,
38 foreach_memif_input_error
41 } memif_input_error_t;
43 static char *memif_input_error_strings[] = {
45 foreach_memif_input_error
54 } memif_input_trace_t;
57 format_memif_input_trace (u8 * s, va_list * args)
59 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
60 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
61 memif_input_trace_t *t = va_arg (*args, memif_input_trace_t *);
62 uword indent = format_get_indent (s);
64 s = format (s, "memif: hw_if_index %d next-index %d",
65 t->hw_if_index, t->next_index);
66 s = format (s, "\n%Uslot: ring %u", format_white_space, indent + 2,
71 static_always_inline void
72 memif_prefetch (vlib_main_t * vm, u32 bi)
74 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
75 vlib_prefetch_buffer_header (b, STORE);
76 CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, STORE);
79 static_always_inline uword
80 memif_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
81 vlib_frame_t * frame, memif_if_t * mif,
82 memif_ring_type_t type, u16 qid)
84 vnet_main_t *vnm = vnet_get_main ();
88 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
89 uword n_trace = vlib_get_trace_count (vm, node);
90 memif_main_t *nm = &memif_main;
95 u32 thread_index = vlib_get_thread_index ();
97 vlib_buffer_t *b0, *b1;
98 u16 ring_size, mask, num_slots;
101 mq = vec_elt_at_index (mif->rx_queues, qid);
103 ring_size = 1 << mq->log2_ring_size;
104 mask = ring_size - 1;
106 if (mif->per_interface_next_index != ~0)
107 next_index = mif->per_interface_next_index;
109 n_free_bufs = vec_len (nm->rx_buffers[thread_index]);
110 if (PREDICT_FALSE (n_free_bufs < ring_size))
112 vec_validate (nm->rx_buffers[thread_index],
113 ring_size + n_free_bufs - 1);
115 vlib_buffer_alloc (vm, &nm->rx_buffers[thread_index][n_free_bufs],
117 _vec_len (nm->rx_buffers[thread_index]) = n_free_bufs;
121 if (head == mq->last_head)
124 if (head > mq->last_head)
125 num_slots = head - mq->last_head;
127 num_slots = ring_size - mq->last_head + head;
132 u32 next0 = next_index;
133 u32 next1 = next_index;
134 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
136 while (num_slots > 5 && n_left_to_next > 2)
138 if (PREDICT_TRUE (mq->last_head + 5 < ring_size))
140 CLIB_PREFETCH (memif_get_buffer (mif, ring, mq->last_head + 2),
141 CLIB_CACHE_LINE_BYTES, LOAD);
142 CLIB_PREFETCH (memif_get_buffer (mif, ring, mq->last_head + 3),
143 CLIB_CACHE_LINE_BYTES, LOAD);
144 CLIB_PREFETCH (&ring->desc[mq->last_head + 4],
145 CLIB_CACHE_LINE_BYTES, LOAD);
146 CLIB_PREFETCH (&ring->desc[mq->last_head + 5],
147 CLIB_CACHE_LINE_BYTES, LOAD);
151 CLIB_PREFETCH (memif_get_buffer
152 (mif, ring, (mq->last_head + 2) % mask),
153 CLIB_CACHE_LINE_BYTES, LOAD);
154 CLIB_PREFETCH (memif_get_buffer
155 (mif, ring, (mq->last_head + 3) % mask),
156 CLIB_CACHE_LINE_BYTES, LOAD);
157 CLIB_PREFETCH (&ring->desc[(mq->last_head + 4) % mask],
158 CLIB_CACHE_LINE_BYTES, LOAD);
159 CLIB_PREFETCH (&ring->desc[(mq->last_head + 5) % mask],
160 CLIB_CACHE_LINE_BYTES, LOAD);
162 /* get empty buffer */
163 u32 last_buf = vec_len (nm->rx_buffers[thread_index]) - 1;
164 bi0 = nm->rx_buffers[thread_index][last_buf];
165 bi1 = nm->rx_buffers[thread_index][last_buf - 1];
166 _vec_len (nm->rx_buffers[thread_index]) -= 2;
170 memif_prefetch (vm, nm->rx_buffers[thread_index][last_buf - 2]);
171 memif_prefetch (vm, nm->rx_buffers[thread_index][last_buf - 3]);
180 /* fill buffer metadata */
181 b0 = vlib_get_buffer (vm, bi0);
182 b1 = vlib_get_buffer (vm, bi1);
184 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
185 vnet_buffer (b1)->sw_if_index[VLIB_RX] = mif->sw_if_index;
187 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
188 vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
191 mb0 = memif_get_buffer (mif, ring, mq->last_head);
192 clib_memcpy (vlib_buffer_get_current (b0), mb0,
193 CLIB_CACHE_LINE_BYTES);
194 b0->current_length = ring->desc[mq->last_head].length;
195 mq->last_head = (mq->last_head + 1) & mask;
197 mb1 = memif_get_buffer (mif, ring, mq->last_head);
198 clib_memcpy (vlib_buffer_get_current (b1), mb1,
199 CLIB_CACHE_LINE_BYTES);
200 b1->current_length = ring->desc[mq->last_head].length;
201 mq->last_head = (mq->last_head + 1) & mask;
203 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
204 clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
205 mb0 + CLIB_CACHE_LINE_BYTES,
206 b0->current_length - CLIB_CACHE_LINE_BYTES);
208 if (b1->current_length > CLIB_CACHE_LINE_BYTES)
209 clib_memcpy (vlib_buffer_get_current (b1) + CLIB_CACHE_LINE_BYTES,
210 mb1 + CLIB_CACHE_LINE_BYTES,
211 b1->current_length - CLIB_CACHE_LINE_BYTES);
214 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
215 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
217 if (PREDICT_FALSE (n_trace > 0))
220 memif_input_trace_t *tr;
221 vlib_trace_buffer (vm, node, next0, b0,
222 /* follow_chain */ 0);
223 vlib_set_trace_count (vm, node, --n_trace);
224 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
225 tr->next_index = next0;
226 tr->hw_if_index = mif->hw_if_index;
232 memif_input_trace_t *tr;
233 vlib_trace_buffer (vm, node, next1, b1,
234 /* follow_chain */ 0);
235 vlib_set_trace_count (vm, node, --n_trace);
236 tr = vlib_add_trace (vm, node, b1, sizeof (*tr));
237 tr->next_index = next1;
238 tr->hw_if_index = mif->hw_if_index;
243 /* redirect if feature path enabled */
244 vnet_feature_start_device_input_x2 (mif->sw_if_index,
245 &next0, &next1, b0, b1);
248 vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next,
250 bi0, bi1, next0, next1);
255 n_rx_bytes += b0->current_length;
256 n_rx_bytes += b1->current_length;
258 while (num_slots && n_left_to_next)
260 /* get empty buffer */
261 u32 last_buf = vec_len (nm->rx_buffers[thread_index]) - 1;
262 bi0 = nm->rx_buffers[thread_index][last_buf];
263 _vec_len (nm->rx_buffers[thread_index]) = last_buf;
270 /* fill buffer metadata */
271 b0 = vlib_get_buffer (vm, bi0);
272 b0->current_length = ring->desc[mq->last_head].length;
273 vnet_buffer (b0)->sw_if_index[VLIB_RX] = mif->sw_if_index;
274 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
277 mb0 = memif_get_buffer (mif, ring, mq->last_head);
278 clib_memcpy (vlib_buffer_get_current (b0), mb0,
279 CLIB_CACHE_LINE_BYTES);
280 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
281 clib_memcpy (vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
282 mb0 + CLIB_CACHE_LINE_BYTES,
283 b0->current_length - CLIB_CACHE_LINE_BYTES);
286 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
288 if (PREDICT_FALSE (n_trace > 0))
290 memif_input_trace_t *tr;
291 vlib_trace_buffer (vm, node, next0, b0,
292 /* follow_chain */ 0);
293 vlib_set_trace_count (vm, node, --n_trace);
294 tr = vlib_add_trace (vm, node, b0, sizeof (*tr));
295 tr->next_index = next0;
296 tr->hw_if_index = mif->hw_if_index;
301 /* redirect if feature path enabled */
302 vnet_feature_start_device_input_x1 (mif->sw_if_index, &next0, b0);
305 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
306 n_left_to_next, bi0, next0);
309 mq->last_head = (mq->last_head + 1) & mask;
312 n_rx_bytes += b0->current_length;
314 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
316 CLIB_MEMORY_STORE_BARRIER ();
319 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
320 + VNET_INTERFACE_COUNTER_RX, thread_index,
321 mif->hw_if_index, n_rx_packets,
328 memif_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
329 vlib_frame_t * frame)
332 memif_main_t *nm = &memif_main;
333 vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
334 vnet_device_and_queue_t *dq;
336 foreach_device_and_queue (dq, rt->devices_and_queues)
339 mif = vec_elt_at_index (nm->interfaces, dq->dev_instance);
340 if ((mif->flags & MEMIF_IF_FLAG_ADMIN_UP) &&
341 (mif->flags & MEMIF_IF_FLAG_CONNECTED))
343 if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
344 n_rx += memif_device_input_inline (vm, node, frame, mif,
345 MEMIF_RING_M2S, dq->queue_id);
347 n_rx += memif_device_input_inline (vm, node, frame, mif,
348 MEMIF_RING_S2M, dq->queue_id);
356 VLIB_REGISTER_NODE (memif_input_node) = {
357 .function = memif_input_fn,
358 .name = "memif-input",
359 .sibling_of = "device-input",
360 .format_trace = format_memif_input_trace,
361 .type = VLIB_NODE_TYPE_INPUT,
362 .state = VLIB_NODE_STATE_INTERRUPT,
363 .n_errors = MEMIF_INPUT_N_ERROR,
364 .error_strings = memif_input_error_strings,
367 VLIB_NODE_FUNCTION_MULTIARCH (memif_input_node, memif_input_fn)
372 * fd.io coding-style-patch-verification: ON
375 * eval: (c-set-style "gnu")