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 *------------------------------------------------------------------
20 #include <sys/ioctl.h>
22 #include <vlib/vlib.h>
23 #include <vlib/unix/unix.h>
24 #include <vnet/ethernet/ethernet.h>
25 #include <vnet/devices/devices.h>
26 #include <vnet/feature/feature.h>
28 #include <vnet/devices/netmap/net_netmap.h>
29 #include <vnet/devices/netmap/netmap.h>
31 #define foreach_netmap_input_error
35 #define _(f,s) NETMAP_INPUT_ERROR_##f,
36 foreach_netmap_input_error
39 } netmap_input_error_t;
41 static char *netmap_input_error_strings[] = {
43 foreach_netmap_input_error
51 struct netmap_slot slot;
52 } netmap_input_trace_t;
55 format_netmap_input_trace (u8 * s, va_list * args)
57 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
58 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
59 netmap_input_trace_t *t = va_arg (*args, netmap_input_trace_t *);
60 u32 indent = format_get_indent (s);
62 s = format (s, "netmap: hw_if_index %d next-index %d",
63 t->hw_if_index, t->next_index);
64 s = format (s, "\n%Uslot: flags 0x%x len %u buf_idx %u",
65 format_white_space, indent + 2,
66 t->slot.flags, t->slot.len, t->slot.buf_idx);
71 buffer_add_to_chain (vlib_main_t * vm, u32 bi, u32 first_bi, u32 prev_bi)
73 vlib_buffer_t *b = vlib_get_buffer (vm, bi);
74 vlib_buffer_t *first_b = vlib_get_buffer (vm, first_bi);
75 vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_bi);
77 /* update first buffer */
78 first_b->total_length_not_including_first_buffer += b->current_length;
80 /* update previous buffer */
81 prev_b->next_buffer = bi;
82 prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT;
84 /* update current buffer */
89 netmap_device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
90 vlib_frame_t * frame, netmap_if_t * nif)
92 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
93 uword n_trace = vlib_get_trace_count (vm, node);
94 netmap_main_t *nm = &netmap_main;
99 struct netmap_ring *ring;
101 u32 thread_index = vm->thread_index;
102 u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm);
104 if (nif->per_interface_next_index != ~0)
105 next_index = nif->per_interface_next_index;
107 n_free_bufs = vec_len (nm->rx_buffers[thread_index]);
108 if (PREDICT_FALSE (n_free_bufs < VLIB_FRAME_SIZE))
110 vec_validate (nm->rx_buffers[thread_index],
111 VLIB_FRAME_SIZE + n_free_bufs - 1);
113 vlib_buffer_alloc (vm, &nm->rx_buffers[thread_index][n_free_bufs],
115 _vec_len (nm->rx_buffers[thread_index]) = n_free_bufs;
118 cur_ring = nif->first_rx_ring;
119 while (cur_ring <= nif->last_rx_ring && n_free_bufs)
123 ring = NETMAP_RXRING (nif->nifp, cur_ring);
124 r = nm_ring_space (ring);
135 cur_slot_index = ring->cur;
139 u32 next0 = next_index;
140 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
142 while (r && n_left_to_next)
144 vlib_buffer_t *first_b0 = 0;
146 u32 bi0 = 0, first_bi0 = 0, prev_bi0;
147 u32 next_slot_index = (cur_slot_index + 1) % ring->num_slots;
148 u32 next2_slot_index = (cur_slot_index + 2) % ring->num_slots;
149 struct netmap_slot *slot = &ring->slot[cur_slot_index];
150 u32 data_len = slot->len;
152 /* prefetch 2 slots in advance */
153 CLIB_PREFETCH (&ring->slot[next2_slot_index],
154 CLIB_CACHE_LINE_BYTES, LOAD);
155 /* prefetch start of next packet */
156 CLIB_PREFETCH (NETMAP_BUF
157 (ring, ring->slot[next_slot_index].buf_idx),
158 CLIB_CACHE_LINE_BYTES, LOAD);
160 while (data_len && n_free_bufs)
163 /* grab free buffer */
164 u32 last_empty_buffer =
165 vec_len (nm->rx_buffers[thread_index]) - 1;
167 bi0 = nm->rx_buffers[thread_index][last_empty_buffer];
168 b0 = vlib_get_buffer (vm, bi0);
169 _vec_len (nm->rx_buffers[thread_index]) = last_empty_buffer;
174 data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
175 b0->current_data = 0;
176 clib_memcpy_fast (vlib_buffer_get_current (b0),
177 (u8 *) NETMAP_BUF (ring, slot->buf_idx) +
178 offset, bytes_to_copy);
180 /* fill buffer header */
181 b0->current_length = bytes_to_copy;
185 b0->total_length_not_including_first_buffer = 0;
186 b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID;
187 vnet_buffer (b0)->sw_if_index[VLIB_RX] =
189 vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
191 first_b0 = vlib_get_buffer (vm, first_bi0);
194 buffer_add_to_chain (vm, bi0, first_bi0, prev_bi0);
196 offset += bytes_to_copy;
197 data_len -= bytes_to_copy;
201 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b0);
202 if (PREDICT_FALSE (n_trace > 0))
204 if (PREDICT_TRUE (first_b0 != 0))
206 netmap_input_trace_t *tr;
207 vlib_trace_buffer (vm, node, next0, first_b0,
208 /* follow_chain */ 0);
209 vlib_set_trace_count (vm, node, --n_trace);
210 tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr));
211 tr->next_index = next0;
212 tr->hw_if_index = nif->hw_if_index;
213 memcpy (&tr->slot, slot, sizeof (struct netmap_slot));
217 /* redirect if feature path enabled */
218 vnet_feature_start_device_input_x1 (nif->sw_if_index, &next0,
221 /* enque and take next packet */
222 vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next,
223 n_left_to_next, first_bi0,
228 n_rx_bytes += slot->len;
229 to_next[0] = first_bi0;
232 cur_slot_index = next_slot_index;
236 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
238 ring->head = ring->cur = cur_slot_index;
243 ioctl (nif->fd, NIOCRXSYNC, NULL);
245 vlib_increment_combined_counter
246 (vnet_get_main ()->interface_main.combined_sw_if_counters
247 + VNET_INTERFACE_COUNTER_RX,
248 vlib_get_thread_index (), nif->hw_if_index, n_rx_packets, n_rx_bytes);
250 vnet_device_increment_rx_packets (thread_index, n_rx_packets);
255 VLIB_NODE_FN (netmap_input_node) (vlib_main_t * vm,
256 vlib_node_runtime_t * node,
257 vlib_frame_t * frame)
260 u32 n_rx_packets = 0;
261 u32 thread_index = vm->thread_index;
262 netmap_main_t *nm = &netmap_main;
265 for (i = 0; i < vec_len (nm->interfaces); i++)
267 nmi = vec_elt_at_index (nm->interfaces, i);
268 if (nmi->is_admin_up &&
269 (i % nm->input_cpu_count) ==
270 (thread_index - nm->input_cpu_first_index))
271 n_rx_packets += netmap_device_input_fn (vm, node, frame, nmi);
278 VLIB_REGISTER_NODE (netmap_input_node) = {
279 .name = "netmap-input",
280 .sibling_of = "device-input",
281 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
282 .format_trace = format_netmap_input_trace,
283 .type = VLIB_NODE_TYPE_INPUT,
284 /* default state is INTERRUPT mode, switch to POLLING if worker threads are enabled */
285 .state = VLIB_NODE_STATE_INTERRUPT,
286 .n_errors = NETMAP_INPUT_N_ERROR,
287 .error_strings = netmap_input_error_strings,
293 * fd.io coding-style-patch-verification: ON
296 * eval: (c-set-style "gnu")