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>
30 #define foreach_memif_tx_func_error \
31 _(NO_FREE_SLOTS, "no free tx slots") \
32 _(PENDING_MSGS, "pending msgs in tx ring")
36 #define _(f,s) MEMIF_TX_ERROR_##f,
37 foreach_memif_tx_func_error
40 } memif_tx_func_error_t;
42 static char *memif_tx_func_error_strings[] = {
44 foreach_memif_tx_func_error
50 format_memif_device_name (u8 * s, va_list * args)
52 u32 i = va_arg (*args, u32);
54 s = format (s, "memif%u", i);
59 format_memif_device (u8 * s, va_list * args)
61 u32 dev_instance = va_arg (*args, u32);
62 int verbose = va_arg (*args, int);
63 uword indent = format_get_indent (s);
65 s = format (s, "MEMIF interface");
68 s = format (s, "\n%U instance %u", format_white_space, indent + 2,
75 format_memif_tx_trace (u8 * s, va_list * args)
77 s = format (s, "Unimplemented...");
81 static_always_inline void
82 memif_prefetch_buffer_and_data (vlib_main_t * vm, u32 bi)
84 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
85 vlib_prefetch_buffer_header (b, LOAD);
86 CLIB_PREFETCH (b->data, CLIB_CACHE_LINE_BYTES, LOAD);
89 static_always_inline uword
90 memif_interface_tx_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
91 vlib_frame_t * frame, memif_if_t * mif,
92 memif_ring_type_t type)
95 memif_ring_t *ring = memif_get_ring (mif, type, rid);
96 u32 *buffers = vlib_frame_args (frame);
97 u32 n_left = frame->n_vectors;
98 u16 ring_size = 1 << mif->log2_ring_size;
99 u16 mask = ring_size - 1;
103 clib_spinlock_lock_if_init (&mif->lockp);
105 /* free consumed buffers */
111 free_slots = tail - head;
113 free_slots = ring_size - head + tail;
115 while (n_left > 5 && free_slots > 1)
117 if (PREDICT_TRUE (head + 5 < ring_size))
119 CLIB_PREFETCH (memif_get_buffer (mif, ring, head + 2),
120 CLIB_CACHE_LINE_BYTES, STORE);
121 CLIB_PREFETCH (memif_get_buffer (mif, ring, head + 3),
122 CLIB_CACHE_LINE_BYTES, STORE);
123 CLIB_PREFETCH (&ring->desc[head + 4], CLIB_CACHE_LINE_BYTES, STORE);
124 CLIB_PREFETCH (&ring->desc[head + 5], CLIB_CACHE_LINE_BYTES, STORE);
128 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 2) % mask),
129 CLIB_CACHE_LINE_BYTES, STORE);
130 CLIB_PREFETCH (memif_get_buffer (mif, ring, (head + 3) % mask),
131 CLIB_CACHE_LINE_BYTES, STORE);
132 CLIB_PREFETCH (&ring->desc[(head + 4) % mask],
133 CLIB_CACHE_LINE_BYTES, STORE);
134 CLIB_PREFETCH (&ring->desc[(head + 5) % mask],
135 CLIB_CACHE_LINE_BYTES, STORE);
138 memif_prefetch_buffer_and_data (vm, buffers[2]);
139 memif_prefetch_buffer_and_data (vm, buffers[3]);
141 vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[0]);
142 vlib_buffer_t *b1 = vlib_get_buffer (vm, buffers[1]);
144 void *mb0 = memif_get_buffer (mif, ring, head);
145 clib_memcpy (mb0, vlib_buffer_get_current (b0), CLIB_CACHE_LINE_BYTES);
146 ring->desc[head].length = b0->current_length;
147 head = (head + 1) & mask;
149 void *mb1 = memif_get_buffer (mif, ring, head);
150 clib_memcpy (mb1, vlib_buffer_get_current (b1), CLIB_CACHE_LINE_BYTES);
151 ring->desc[head].length = b1->current_length;
152 head = (head + 1) & mask;
154 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
156 clib_memcpy (mb0 + CLIB_CACHE_LINE_BYTES,
157 vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
158 b0->current_length - CLIB_CACHE_LINE_BYTES);
160 if (b1->current_length > CLIB_CACHE_LINE_BYTES)
162 clib_memcpy (mb1 + CLIB_CACHE_LINE_BYTES,
163 vlib_buffer_get_current (b1) + CLIB_CACHE_LINE_BYTES,
164 b1->current_length - CLIB_CACHE_LINE_BYTES);
173 while (n_left && free_slots)
175 vlib_buffer_t *b0 = vlib_get_buffer (vm, buffers[0]);
176 void *mb0 = memif_get_buffer (mif, ring, head);
177 clib_memcpy (mb0, vlib_buffer_get_current (b0), CLIB_CACHE_LINE_BYTES);
179 if (b0->current_length > CLIB_CACHE_LINE_BYTES)
181 clib_memcpy (mb0 + CLIB_CACHE_LINE_BYTES,
182 vlib_buffer_get_current (b0) + CLIB_CACHE_LINE_BYTES,
183 b0->current_length - CLIB_CACHE_LINE_BYTES);
185 ring->desc[head].length = b0->current_length;
186 head = (head + 1) & mask;
193 CLIB_MEMORY_STORE_BARRIER ();
196 clib_spinlock_unlock (&mif->lockp);
200 vlib_error_count (vm, node->node_index, MEMIF_TX_ERROR_NO_FREE_SLOTS,
202 vlib_buffer_free (vm, buffers, n_left);
205 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
206 if (mif->interrupt_line.fd > 0)
209 CLIB_UNUSED (int r) = write (mif->interrupt_line.fd, &b, sizeof (b));
212 return frame->n_vectors;
216 memif_interface_tx (vlib_main_t * vm,
217 vlib_node_runtime_t * node, vlib_frame_t * frame)
219 memif_main_t *nm = &memif_main;
220 vnet_interface_output_runtime_t *rund = (void *) node->runtime_data;
221 memif_if_t *mif = pool_elt_at_index (nm->interfaces, rund->dev_instance);
223 if (mif->flags & MEMIF_IF_FLAG_IS_SLAVE)
224 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_S2M);
226 return memif_interface_tx_inline (vm, node, frame, mif, MEMIF_RING_M2S);
230 memif_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
233 memif_main_t *apm = &memif_main;
234 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
235 memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
237 /* Shut off redirection */
238 if (node_index == ~0)
240 mif->per_interface_next_index = node_index;
244 mif->per_interface_next_index =
245 vlib_node_add_next (vlib_get_main (), memif_input_node.index, node_index);
249 memif_clear_hw_interface_counters (u32 instance)
251 /* Nothing for now */
254 static clib_error_t *
255 memif_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
257 memif_main_t *apm = &memif_main;
259 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
260 memif_if_t *mif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
262 if (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP)
263 mif->flags |= MEMIF_IF_FLAG_ADMIN_UP;
266 mif->flags &= ~MEMIF_IF_FLAG_ADMIN_UP;
267 if (!(mif->flags & MEMIF_IF_FLAG_DELETING)
268 && mif->connection.index != ~0)
270 msg.version = MEMIF_VERSION;
271 msg.type = MEMIF_MSG_TYPE_DISCONNECT;
272 send (mif->connection.fd, &msg, sizeof (msg), 0);
279 static clib_error_t *
280 memif_subif_add_del_function (vnet_main_t * vnm,
282 struct vnet_sw_interface_t *st, int is_add)
284 /* Nothing for now */
289 VNET_DEVICE_CLASS (memif_device_class) = {
291 .tx_function = memif_interface_tx,
292 .format_device_name = format_memif_device_name,
293 .format_device = format_memif_device,
294 .format_tx_trace = format_memif_tx_trace,
295 .tx_function_n_errors = MEMIF_TX_N_ERROR,
296 .tx_function_error_strings = memif_tx_func_error_strings,
297 .rx_redirect_to_node = memif_set_interface_next_node,
298 .clear_counters = memif_clear_hw_interface_counters,
299 .admin_up_down_function = memif_interface_admin_up_down,
300 .subif_add_del_function = memif_subif_add_del_function,
303 VLIB_DEVICE_TX_FUNCTION_MULTIARCH(memif_device_class,
308 * fd.io coding-style-patch-verification: ON
311 * eval: (c-set-style "gnu")