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>
28 #include <memif/memif.h>
29 #include <memif/private.h>
31 #define foreach_memif_tx_func_error \
32 _(NO_FREE_SLOTS, "no free tx slots") \
33 _(TRUNC_PACKET, "packet > buffer size -- truncated in tx ring") \
34 _(PENDING_MSGS, "pending msgs in tx ring") \
35 _(NO_TX_QUEUES, "no tx queues")
39 #define _(f,s) MEMIF_TX_ERROR_##f,
40 foreach_memif_tx_func_error
43 } memif_tx_func_error_t;
45 static __clib_unused char *memif_tx_func_error_strings[] = {
47 foreach_memif_tx_func_error
51 #ifndef CLIB_MULTIARCH_VARIANT
53 format_memif_device_name (u8 * s, va_list * args)
55 u32 dev_instance = va_arg (*args, u32);
56 memif_main_t *mm = &memif_main;
57 memif_if_t *mif = pool_elt_at_index (mm->interfaces, dev_instance);
59 s = format (s, "memif%lu/%lu", mif->socket_file_index, mif->id);
64 static __clib_unused u8 *
65 format_memif_device (u8 * s, va_list * args)
67 u32 dev_instance = va_arg (*args, u32);
68 int verbose = va_arg (*args, int);
69 u32 indent = format_get_indent (s);
71 s = format (s, "MEMIF interface");
74 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
80 static __clib_unused u8 *
81 format_memif_tx_trace (u8 * s, va_list * args)
83 s = format (s, "Unimplemented...");
87 static_always_inline void
88 memif_prefetch_buffer_and_data (vlib_main_t * vm, u32 bi)
90 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
91 vlib_prefetch_buffer_header (b, LOAD);
92 CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, LOAD);
96 * @brief Copy buffer to tx ring
100 * @param * mif (in) pointer to memif interface
101 * @param bi (in) vlib buffer index
102 * @param * ring (in) pointer to memif ring
103 * @param * head (in/out) ring head
104 * @param mask (in) ring size - 1
106 static_always_inline void
107 memif_copy_buffer_to_tx_ring (vlib_main_t * vm, vlib_node_runtime_t * node,
108 memif_if_t * mif, u32 bi, memif_ring_t * ring,
109 u16 * head, u16 mask)
114 u16 slot = (*head) & mask;
116 mb0 = memif_get_buffer (mif, ring, slot);
117 ring->desc[slot].flags = 0;
120 b0 = vlib_get_buffer (vm, bi);
121 len = b0->current_length;
122 if (PREDICT_FALSE (ring->desc[slot].buffer_length < (total + len)))
124 if (PREDICT_TRUE (total))
126 ring->desc[slot].length = total;
128 ring->desc[slot].flags |= MEMIF_DESC_FLAG_NEXT;
130 slot = (*head) & mask;
131 mb0 = memif_get_buffer (mif, ring, slot);
132 ring->desc[slot].flags = 0;
135 if (PREDICT_TRUE (ring->desc[slot].buffer_length >= (total + len)))
137 clib_memcpy (mb0 + total, vlib_buffer_get_current (b0),
138 CLIB_CACHE_LINE_BYTES);
139 if (len > CLIB_CACHE_LINE_BYTES)
140 clib_memcpy (mb0 + CLIB_CACHE_LINE_BYTES + total,
141 vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
142 len - CLIB_CACHE_LINE_BYTES);
147 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_TRUNC_PACKET,
152 while ((bi = (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
154 if (PREDICT_TRUE (total))
156 ring->desc[slot].length = total;
161 static_always_inline uword
162 memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
163 vlib_frame_t * frame, memif_if_t * mif,
164 memif_ring_type_t type)
168 u32 *buffers = vlib_frame_args (frame);
169 u32 n_left = frame->n_vectors;
173 u32 thread_index = vlib_get_thread_index ();
174 u8 tx_queues = vec_len (mif->tx_queues);
177 if (PREDICT_FALSE (tx_queues == 0))
179 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_TX_QUEUES,
184 if (tx_queues < vec_len (vlib_mains))
186 qid = thread_index % tx_queues;
187 clib_spinlock_lock_if_init (&mif->lockp);
193 mq = vec_elt_at_index (mif->tx_queues, qid);
195 ring_size = 1 << mq->log2_ring_size;
196 mask = ring_size - 1;
198 /* free consumed buffers */
203 free_slots = ring_size - head + tail;
205 while (n_left > 5 && free_slots > 1)
207 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 2) & mask),
208 CLIB_CACHE_LINE_BYTES, STORE);
209 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 3) & mask),
210 CLIB_CACHE_LINE_BYTES, STORE);
211 CLIB_PREFETCH (&ring->desc[(head + 4) & mask], CLIB_CACHE_LINE_BYTES,
213 CLIB_PREFETCH (&ring->desc[(head + 5) & mask], CLIB_CACHE_LINE_BYTES,
215 memif_prefetch_buffer_and_data (vm, buffers[2]);
216 memif_prefetch_buffer_and_data (vm, buffers[3]);
218 memif_copy_buffer_to_tx_ring (vm, node, mif, buffers[0], ring, &head,
220 memif_copy_buffer_to_tx_ring (vm, node, mif, buffers[1], ring, &head,
228 while (n_left && free_slots)
230 memif_copy_buffer_to_tx_ring (vm, node, mif, buffers[0], ring, &head,
237 CLIB_MEMORY_STORE_BARRIER ();
240 clib_spinlock_unlock_if_init (&mif->lockp);
244 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_FREE_SLOTS,
248 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0 && mq->int_fd > -1)
251 CLIB_UNUSED (int r) = write (mq->int_fd, &b, sizeof (b));
256 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
258 return frame->n_vectors;
262 CLIB_MULTIARCH_FN (memif_interface_tx) (vlib_main_t * vm,
263 vlib_node_runtime_t * node,
264 vlib_frame_t * frame)
266 memif_main_t *nm = &memif_main;
267 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
268 memif_if_t *mif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
270 if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
271 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_S2M);
273 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_M2S);
276 static __clib_unused void
277 memif_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
280 memif_main_t *apm = &memif_main;
281 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
282 memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
284 /* Shut off redirection */
285 if (node_index == ~0)
287 mif->per_interface_next_index = node_index;
291 mif->per_interface_next_index =
292 vlib_node_add_next (vlib_get_main (), memif_input_node.index, node_index);
295 static __clib_unused void
296 memif_clear_hw_interface_counters (u32 instance)
298 /* Nothing for now */
301 static __clib_unused clib_error_t *
302 memif_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
303 vnet_hw_interface_rx_mode mode)
305 memif_main_t *mm = &memif_main;
306 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
307 memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
308 memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, qid);
310 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
311 mq->ring->flags |= MEMIF_RING_FLAG_MASK_INT;
313 mq->ring->flags &= ~MEMIF_RING_FLAG_MASK_INT;
318 static __clib_unused clib_error_t *
319 memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
321 memif_main_t *mm = &memif_main;
322 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
323 memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
324 static clib_error_t *error = 0;
326 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
327 mif->flags |= MEMIF_IF_FLAG_ADMIN_UP;
329 mif->flags &= ~MEMIF_IF_FLAG_ADMIN_UP;
334 static __clib_unused clib_error_t *
335 memif_subif_add_del_function (vnet_main_t * vnm,
337 struct vnet_sw_interface_t *st, int is_add)
339 /* Nothing for now */
343 #ifndef CLIB_MULTIARCH_VARIANT
345 VNET_DEVICE_CLASS (memif_device_class) = {
347 .tx_function = memif_interface_tx,
348 .format_device_name = format_memif_device_name,
349 .format_device = format_memif_device,
350 .format_tx_trace = format_memif_tx_trace,
351 .tx_function_n_errors = MEMIF_TX_N_ERROR,
352 .tx_function_error_strings = memif_tx_func_error_strings,
353 .rx_redirect_to_node = memif_set_interface_next_node,
354 .clear_counters = memif_clear_hw_interface_counters,
355 .admin_up_down_function = memif_interface_admin_up_down,
356 .subif_add_del_function = memif_subif_add_del_function,
357 .rx_mode_change_function = memif_interface_rx_mode_change,
361 vlib_node_function_t __clib_weak memif_interface_tx_avx512;
362 vlib_node_function_t __clib_weak memif_interface_tx_avx2;
363 static void __clib_constructor
364 dpdk_interface_tx_multiarch_select (void)
366 if (memif_interface_tx_avx512 && clib_cpu_supports_avx512f ())
367 memif_device_class.tx_function = memif_interface_tx_avx512;
368 else if (memif_interface_tx_avx2 && clib_cpu_supports_avx2 ())
369 memif_device_class.tx_function = memif_interface_tx_avx2;
377 * fd.io coding-style-patch-verification: ON
380 * eval: (c-set-style "gnu")