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 char *memif_tx_func_error_strings[] = {
47 foreach_memif_tx_func_error
52 format_memif_device_name (u8 * s, va_list * args)
54 u32 dev_instance = va_arg (*args, u32);
55 memif_main_t *mm = &memif_main;
56 memif_if_t *mif = pool_elt_at_index (mm->interfaces, dev_instance);
58 s = format (s, "memif%lu/%lu", mif->socket_file_index, mif->id);
63 format_memif_device (u8 * s, va_list * args)
65 u32 dev_instance = va_arg (*args, u32);
66 int verbose = va_arg (*args, int);
67 u32 indent = format_get_indent (s);
69 s = format (s, "MEMIF interface");
72 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
79 format_memif_tx_trace (u8 * s, va_list * args)
81 s = format (s, "Unimplemented...");
85 static_always_inline void
86 memif_prefetch_buffer_and_data (vlib_main_t * vm, u32 bi)
88 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
89 vlib_prefetch_buffer_header (b, LOAD);
90 CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, LOAD);
94 * @brief Copy buffer to tx ring
98 * @param * mif (in) pointer to memif interface
99 * @param bi (in) vlib buffer index
100 * @param * ring (in) pointer to memif ring
101 * @param * head (in/out) ring head
102 * @param mask (in) ring size - 1
104 static_always_inline void
105 memif_copy_buffer_to_tx_ring (vlib_main_t * vm, vlib_node_runtime_t * node,
106 memif_if_t * mif, u32 bi, memif_ring_t * ring,
107 u16 * head, u16 mask)
112 u16 slot = (*head) & mask;
114 mb0 = memif_get_buffer (mif, ring, slot);
115 ring->desc[slot].flags = 0;
118 b0 = vlib_get_buffer (vm, bi);
119 len = b0->current_length;
120 if (PREDICT_FALSE (ring->desc[slot].buffer_length < (total + len)))
122 if (PREDICT_TRUE (total))
124 ring->desc[slot].length = total;
126 ring->desc[slot].flags |= MEMIF_DESC_FLAG_NEXT;
128 slot = (*head) & mask;
129 mb0 = memif_get_buffer (mif, ring, slot);
130 ring->desc[slot].flags = 0;
133 if (PREDICT_TRUE (ring->desc[slot].buffer_length >= (total + len)))
135 clib_memcpy (mb0 + total, vlib_buffer_get_current (b0),
136 CLIB_CACHE_LINE_BYTES);
137 if (len > CLIB_CACHE_LINE_BYTES)
138 clib_memcpy (mb0 + CLIB_CACHE_LINE_BYTES + total,
139 vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
140 len - CLIB_CACHE_LINE_BYTES);
145 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_TRUNC_PACKET,
150 while ((bi = (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
152 if (PREDICT_TRUE (total))
154 ring->desc[slot].length = total;
159 static_always_inline uword
160 memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
161 vlib_frame_t * frame, memif_if_t * mif,
162 memif_ring_type_t type)
166 u32 *buffers = vlib_frame_args (frame);
167 u32 n_left = frame->n_vectors;
171 u32 thread_index = vlib_get_thread_index ();
172 u8 tx_queues = vec_len (mif->tx_queues);
175 if (PREDICT_FALSE (tx_queues == 0))
177 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_TX_QUEUES,
182 if (tx_queues < vec_len (vlib_mains))
184 qid = thread_index % tx_queues;
185 clib_spinlock_lock_if_init (&mif->lockp);
191 mq = vec_elt_at_index (mif->tx_queues, qid);
193 ring_size = 1 << mq->log2_ring_size;
194 mask = ring_size - 1;
196 /* free consumed buffers */
201 free_slots = ring_size - head + tail;
203 while (n_left > 5 && free_slots > 1)
205 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 2) & mask),
206 CLIB_CACHE_LINE_BYTES, STORE);
207 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 3) & mask),
208 CLIB_CACHE_LINE_BYTES, STORE);
209 CLIB_PREFETCH (&ring->desc[(head + 4) & mask], CLIB_CACHE_LINE_BYTES,
211 CLIB_PREFETCH (&ring->desc[(head + 5) & mask], CLIB_CACHE_LINE_BYTES,
213 memif_prefetch_buffer_and_data (vm, buffers[2]);
214 memif_prefetch_buffer_and_data (vm, buffers[3]);
216 memif_copy_buffer_to_tx_ring (vm, node, mif, buffers[0], ring, &head,
218 memif_copy_buffer_to_tx_ring (vm, node, mif, buffers[1], ring, &head,
226 while (n_left && free_slots)
228 memif_copy_buffer_to_tx_ring (vm, node, mif, buffers[0], ring, &head,
235 CLIB_MEMORY_STORE_BARRIER ();
238 clib_spinlock_unlock_if_init (&mif->lockp);
242 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_FREE_SLOTS,
246 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0 && mq->int_fd > -1)
249 CLIB_UNUSED (int r) = write (mq->int_fd, &b, sizeof (b));
254 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
256 return frame->n_vectors;
260 memif_interface_tx (vlib_main_t * vm,
261 vlib_node_runtime_t * node, vlib_frame_t * frame)
263 memif_main_t *nm = &memif_main;
264 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
265 memif_if_t *mif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
267 if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
268 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_S2M);
270 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_M2S);
274 memif_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
277 memif_main_t *apm = &memif_main;
278 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
279 memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
281 /* Shut off redirection */
282 if (node_index == ~0)
284 mif->per_interface_next_index = node_index;
288 mif->per_interface_next_index =
289 vlib_node_add_next (vlib_get_main (), memif_input_node.index, node_index);
293 memif_clear_hw_interface_counters (u32 instance)
295 /* Nothing for now */
298 static clib_error_t *
299 memif_interface_rx_mode_change (vnet_main_t * vnm, u32 hw_if_index, u32 qid,
300 vnet_hw_interface_rx_mode mode)
302 memif_main_t *mm = &memif_main;
303 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
304 memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
305 memif_queue_t *mq = vec_elt_at_index (mif->rx_queues, qid);
307 if (mode == VNET_HW_INTERFACE_RX_MODE_POLLING)
308 mq->ring->flags |= MEMIF_RING_FLAG_MASK_INT;
310 mq->ring->flags &= ~MEMIF_RING_FLAG_MASK_INT;
315 static clib_error_t *
316 memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
318 memif_main_t *mm = &memif_main;
319 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
320 memif_if_t *mif = pool_elt_at_index (mm->interfaces, hw->dev_instance);
321 static clib_error_t *error = 0;
323 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
324 mif->flags |= MEMIF_IF_FLAG_ADMIN_UP;
326 mif->flags &= ~MEMIF_IF_FLAG_ADMIN_UP;
331 static clib_error_t *
332 memif_subif_add_del_function (vnet_main_t * vnm,
334 struct vnet_sw_interface_t *st, int is_add)
336 /* Nothing for now */
341 VNET_DEVICE_CLASS (memif_device_class) = {
343 .tx_function = memif_interface_tx,
344 .format_device_name = format_memif_device_name,
345 .format_device = format_memif_device,
346 .format_tx_trace = format_memif_tx_trace,
347 .tx_function_n_errors = MEMIF_TX_N_ERROR,
348 .tx_function_error_strings = memif_tx_func_error_strings,
349 .rx_redirect_to_node = memif_set_interface_next_node,
350 .clear_counters = memif_clear_hw_interface_counters,
351 .admin_up_down_function = memif_interface_admin_up_down,
352 .subif_add_del_function = memif_subif_add_del_function,
353 .rx_mode_change_function = memif_interface_rx_mode_change,
356 VLIB_DEVICE_TX_FUNCTION_MULTIARCH(memif_device_class,
361 * fd.io coding-style-patch-verification: ON
364 * eval: (c-set-style "gnu")