2 *------------------------------------------------------------------
3 * Copyright (c) 2018 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 *------------------------------------------------------------------
18 #include <vlib/vlib.h>
19 #include <vlib/unix/unix.h>
20 #include <vlib/pci/pci.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/devices/devices.h>
23 #include <vnet/interface/rx_queue_funcs.h>
26 #define foreach_af_xdp_input_error \
27 _ (SYSCALL_REQUIRED, "syscall required") \
28 _ (SYSCALL_FAILURES, "syscall failures")
32 #define _(f,s) AF_XDP_INPUT_ERROR_##f,
33 foreach_af_xdp_input_error
36 } af_xdp_input_error_t;
38 static __clib_unused char *af_xdp_input_error_strings[] = {
40 foreach_af_xdp_input_error
44 static_always_inline void
45 af_xdp_device_input_trace (vlib_main_t * vm, vlib_node_runtime_t * node,
46 u32 n_left, const u32 * bi, u32 next_index,
49 u32 n_trace = vlib_get_trace_count (vm, node);
51 if (PREDICT_TRUE (0 == n_trace))
54 while (n_trace && n_left)
56 vlib_buffer_t *b = vlib_get_buffer (vm, bi[0]);
58 (vlib_trace_buffer (vm, node, next_index, b, /* follow_chain */ 0)))
60 af_xdp_input_trace_t *tr =
61 vlib_add_trace (vm, node, b, sizeof (*tr));
62 tr->next_index = next_index;
63 tr->hw_if_index = hw_if_index;
70 vlib_set_trace_count (vm, node, n_trace);
73 static_always_inline void
74 af_xdp_device_input_refill_db (vlib_main_t * vm,
75 const vlib_node_runtime_t * node,
76 af_xdp_device_t * ad, af_xdp_rxq_t * rxq,
79 xsk_ring_prod__submit (&rxq->fq, n_alloc);
81 if (AF_XDP_RXQ_MODE_INTERRUPT == rxq->mode ||
82 !xsk_ring_prod__needs_wakeup (&rxq->fq))
86 vlib_error_count (vm, node->node_index,
87 AF_XDP_INPUT_ERROR_SYSCALL_REQUIRED, 1);
89 if (clib_spinlock_trylock_if_init (&rxq->syscall_lock))
91 int ret = recvmsg (rxq->xsk_fd, 0, MSG_DONTWAIT);
92 clib_spinlock_unlock_if_init (&rxq->syscall_lock);
93 if (PREDICT_FALSE (ret < 0))
95 /* something bad is happening */
97 vlib_error_count (vm, node->node_index,
98 AF_XDP_INPUT_ERROR_SYSCALL_FAILURES, 1);
99 af_xdp_device_error (ad, "rx poll() failed");
104 static_always_inline void
105 af_xdp_device_input_refill_inline (vlib_main_t *vm,
106 const vlib_node_runtime_t *node,
107 af_xdp_device_t *ad, af_xdp_rxq_t *rxq)
110 const u32 size = rxq->fq.size;
111 const u32 mask = size - 1;
112 u32 bis[VLIB_FRAME_SIZE], *bi = bis;
113 u32 n_alloc, n, n_wrap;
116 ASSERT (mask == rxq->fq.mask);
118 /* do not enqueue more packet than ring space */
119 n_alloc = xsk_prod_nb_free (&rxq->fq, 16);
120 /* do not bother to allocate if too small */
124 n_alloc = clib_min (n_alloc, ARRAY_LEN (bis));
125 n_alloc = vlib_buffer_alloc_from_pool (vm, bis, n_alloc, ad->pool);
126 n = xsk_ring_prod__reserve (&rxq->fq, n_alloc, &idx);
127 ASSERT (n == n_alloc);
129 fill = xsk_ring_prod__fill_addr (&rxq->fq, idx);
130 n = clib_min (n_alloc, size - (idx & mask));
131 n_wrap = n_alloc - n;
133 #define bi2addr(bi) ((bi) << CLIB_LOG2_CACHE_LINE_BYTES)
139 #ifdef CLIB_HAVE_VEC256
140 u64x4 b0 = u64x4_from_u32x4 (*(u32x4u *) (bi + 0));
141 u64x4 b1 = u64x4_from_u32x4 (*(u32x4u *) (bi + 4));
142 *(u64x4u *) (fill + 0) = bi2addr (b0);
143 *(u64x4u *) (fill + 4) = bi2addr (b1);
145 fill[0] = bi2addr (bi[0]);
146 fill[1] = bi2addr (bi[1]);
147 fill[2] = bi2addr (bi[2]);
148 fill[3] = bi2addr (bi[3]);
149 fill[4] = bi2addr (bi[4]);
150 fill[5] = bi2addr (bi[5]);
151 fill[6] = bi2addr (bi[6]);
152 fill[7] = bi2addr (bi[7]);
161 fill[0] = bi2addr (bi[0]);
169 fill = xsk_ring_prod__fill_addr (&rxq->fq, 0);
175 af_xdp_device_input_refill_db (vm, node, ad, rxq, n_alloc);
178 static_always_inline void
179 af_xdp_device_input_ethernet (vlib_main_t * vm, vlib_node_runtime_t * node,
180 const u32 next_index, const u32 sw_if_index,
181 const u32 hw_if_index)
183 vlib_next_frame_t *nf;
185 ethernet_input_frame_t *ef;
187 if (PREDICT_FALSE (VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT != next_index))
191 vlib_node_runtime_get_next_frame (vm, node,
192 VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT);
193 f = vlib_get_frame (vm, nf->frame);
194 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
196 ef = vlib_frame_scalar_args (f);
197 ef->sw_if_index = sw_if_index;
198 ef->hw_if_index = hw_if_index;
199 vlib_frame_no_append (f);
202 static_always_inline u32
203 af_xdp_device_input_bufs (vlib_main_t *vm, const af_xdp_device_t *ad,
204 af_xdp_rxq_t *rxq, u32 *bis, const u32 n_rx,
205 vlib_buffer_t *bt, u32 idx)
207 vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs;
208 u16 offs[VLIB_FRAME_SIZE], *off = offs;
209 u16 lens[VLIB_FRAME_SIZE], *len = lens;
210 const u32 mask = rxq->rx.mask;
211 u32 n = n_rx, *bi = bis, bytes = 0;
213 #define addr2bi(addr) ((addr) >> CLIB_LOG2_CACHE_LINE_BYTES)
217 const struct xdp_desc *desc = xsk_ring_cons__rx_desc (&rxq->rx, idx);
218 const u64 addr = desc->addr;
219 bi[0] = addr2bi (xsk_umem__extract_addr (addr));
220 ASSERT (vlib_buffer_is_known (vm, bi[0]) ==
221 VLIB_BUFFER_KNOWN_ALLOCATED);
222 off[0] = xsk_umem__extract_offset (addr) - sizeof (vlib_buffer_t);
224 idx = (idx + 1) & mask;
231 vlib_get_buffers (vm, bis, bufs, n_rx);
239 vlib_prefetch_buffer_header (b[4], LOAD);
240 vlib_buffer_copy_template (b[0], bt);
241 b[0]->current_data = off[0];
242 bytes += b[0]->current_length = len[0];
244 vlib_prefetch_buffer_header (b[5], LOAD);
245 vlib_buffer_copy_template (b[1], bt);
246 b[1]->current_data = off[1];
247 bytes += b[1]->current_length = len[1];
249 vlib_prefetch_buffer_header (b[6], LOAD);
250 vlib_buffer_copy_template (b[2], bt);
251 b[2]->current_data = off[2];
252 bytes += b[2]->current_length = len[2];
254 vlib_prefetch_buffer_header (b[7], LOAD);
255 vlib_buffer_copy_template (b[3], bt);
256 b[3]->current_data = off[3];
257 bytes += b[3]->current_length = len[3];
267 vlib_buffer_copy_template (b[0], bt);
268 b[0]->current_data = off[0];
269 bytes += b[0]->current_length = len[0];
276 xsk_ring_cons__release (&rxq->rx, n_rx);
280 static_always_inline uword
281 af_xdp_device_input_inline (vlib_main_t *vm, vlib_node_runtime_t *node,
282 vlib_frame_t *frame, af_xdp_device_t *ad, u16 qid)
284 vnet_main_t *vnm = vnet_get_main ();
285 af_xdp_rxq_t *rxq = vec_elt_at_index (ad->rxqs, qid);
287 u32 next_index, *to_next, n_left_to_next;
288 u32 n_rx_packets, n_rx_bytes;
291 n_rx_packets = xsk_ring_cons__peek (&rxq->rx, VLIB_FRAME_SIZE, &idx);
293 if (PREDICT_FALSE (0 == n_rx_packets))
296 vlib_buffer_copy_template (&bt, ad->buffer_template);
297 next_index = ad->per_interface_next_index;
298 if (PREDICT_FALSE (vnet_device_input_have_features (ad->sw_if_index)))
299 vnet_feature_start_device_input (ad->sw_if_index, &next_index, &bt);
301 vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
304 af_xdp_device_input_bufs (vm, ad, rxq, to_next, n_rx_packets, &bt, idx);
305 af_xdp_device_input_ethernet (vm, node, next_index, ad->sw_if_index,
308 vlib_put_next_frame (vm, node, next_index, n_left_to_next - n_rx_packets);
310 af_xdp_device_input_trace (vm, node, n_rx_packets, to_next, next_index,
313 vlib_increment_combined_counter
314 (vnm->interface_main.combined_sw_if_counters +
315 VNET_INTERFACE_COUNTER_RX, vm->thread_index,
316 ad->hw_if_index, n_rx_packets, n_rx_bytes);
319 af_xdp_device_input_refill_inline (vm, node, ad, rxq);
324 VLIB_NODE_FN (af_xdp_input_node) (vlib_main_t * vm,
325 vlib_node_runtime_t * node,
326 vlib_frame_t * frame)
329 af_xdp_main_t *am = &af_xdp_main;
330 vnet_hw_if_rxq_poll_vector_t *p,
331 *pv = vnet_hw_if_get_rxq_poll_vector (vm, node);
335 af_xdp_device_t *ad = vec_elt_at_index (am->devices, p->dev_instance);
336 if ((ad->flags & AF_XDP_DEVICE_F_ADMIN_UP) == 0)
338 n_rx += af_xdp_device_input_inline (vm, node, frame, ad, p->queue_id);
344 #ifndef CLIB_MARCH_VARIANT
346 af_xdp_device_input_refill (af_xdp_device_t *ad)
348 vlib_main_t *vm = vlib_get_main ();
350 vec_foreach (rxq, ad->rxqs)
351 af_xdp_device_input_refill_inline (vm, 0, ad, rxq);
353 #endif /* CLIB_MARCH_VARIANT */
356 VLIB_REGISTER_NODE (af_xdp_input_node) = {
357 .name = "af_xdp-input",
358 .sibling_of = "device-input",
359 .format_trace = format_af_xdp_input_trace,
360 .type = VLIB_NODE_TYPE_INPUT,
361 .state = VLIB_NODE_STATE_DISABLED,
362 .n_errors = AF_XDP_INPUT_N_ERROR,
363 .error_strings = af_xdp_input_error_strings,
364 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
369 * fd.io coding-style-patch-verification: ON
372 * eval: (c-set-style "gnu")