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>
26 #define foreach_avf_input_error \
27 _(BUFFER_ALLOC, "buffer alloc error")
31 #define _(f,s) AVF_INPUT_ERROR_##f,
32 foreach_avf_input_error
37 static __clib_unused char *avf_input_error_strings[] = {
39 foreach_avf_input_error
43 #define AVF_INPUT_REFILL_TRESHOLD 32
45 static_always_inline void
46 avf_rx_desc_write (avf_rx_desc_t * d, u64 addr)
48 #ifdef CLIB_HAVE_VEC256
49 u64x4 v = { addr, 0, 0, 0 };
50 u64x4_store_unaligned (v, (void *) d);
57 static_always_inline void
58 avf_rxq_refill (vlib_main_t * vm, vlib_node_runtime_t * node, avf_rxq_t * rxq,
61 u16 n_refill, mask, n_alloc, slot, size;
63 avf_rx_desc_t *d, *first_d;
68 n_refill = mask - rxq->n_enqueued;
69 if (PREDICT_TRUE (n_refill <= AVF_INPUT_REFILL_TRESHOLD))
72 slot = (rxq->next - n_refill - 1) & mask;
74 n_refill &= ~7; /* round to 8 */
76 vlib_buffer_alloc_to_ring_from_pool (vm, rxq->bufs, slot, size, n_refill,
77 rxq->buffer_pool_index);
79 if (PREDICT_FALSE (n_alloc != n_refill))
81 vlib_error_count (vm, node->node_index,
82 AVF_INPUT_ERROR_BUFFER_ALLOC, 1);
84 vlib_buffer_free_from_ring (vm, rxq->bufs, slot, size, n_alloc);
88 rxq->n_enqueued += n_alloc;
91 ASSERT (slot % 8 == 0);
99 vlib_get_buffers_with_offset (vm, rxq->bufs + slot, p, 8,
100 sizeof (vlib_buffer_t));
101 avf_rx_desc_write (d + 0, pointer_to_uword (p[0]));
102 avf_rx_desc_write (d + 1, pointer_to_uword (p[1]));
103 avf_rx_desc_write (d + 2, pointer_to_uword (p[2]));
104 avf_rx_desc_write (d + 3, pointer_to_uword (p[3]));
105 avf_rx_desc_write (d + 4, pointer_to_uword (p[4]));
106 avf_rx_desc_write (d + 5, pointer_to_uword (p[5]));
107 avf_rx_desc_write (d + 6, pointer_to_uword (p[6]));
108 avf_rx_desc_write (d + 7, pointer_to_uword (p[7]));
112 vlib_get_buffers (vm, rxq->bufs + slot, b, 8);
113 avf_rx_desc_write (d + 0, vlib_buffer_get_pa (vm, b[0]));
114 avf_rx_desc_write (d + 1, vlib_buffer_get_pa (vm, b[1]));
115 avf_rx_desc_write (d + 2, vlib_buffer_get_pa (vm, b[2]));
116 avf_rx_desc_write (d + 3, vlib_buffer_get_pa (vm, b[3]));
117 avf_rx_desc_write (d + 4, vlib_buffer_get_pa (vm, b[4]));
118 avf_rx_desc_write (d + 5, vlib_buffer_get_pa (vm, b[5]));
119 avf_rx_desc_write (d + 6, vlib_buffer_get_pa (vm, b[6]));
120 avf_rx_desc_write (d + 7, vlib_buffer_get_pa (vm, b[7]));
124 slot = (slot + 8) & mask;
128 CLIB_MEMORY_STORE_BARRIER ();
129 *(rxq->qrx_tail) = slot;
133 static_always_inline uword
134 avf_rx_attach_tail (vlib_main_t * vm, vlib_buffer_t * bt, vlib_buffer_t * b,
135 u64 qw1, avf_rx_tail_t * t)
137 vlib_buffer_t *hb = b;
138 u32 tlnifb = 0, i = 0;
140 if (qw1 & AVF_RXD_STATUS_EOP)
143 while ((qw1 & AVF_RXD_STATUS_EOP) == 0)
145 ASSERT (i < AVF_RX_MAX_DESC_IN_CHAIN - 1);
146 ASSERT (qw1 & AVF_RXD_STATUS_DD);
148 b->next_buffer = t->buffers[i];
149 b->flags |= VLIB_BUFFER_NEXT_PRESENT;
150 b = vlib_get_buffer (vm, b->next_buffer);
151 vlib_buffer_copy_template (b, bt);
152 tlnifb += b->current_length = qw1 >> AVF_RXD_LEN_SHIFT;
156 hb->total_length_not_including_first_buffer = tlnifb;
157 hb->flags |= VLIB_BUFFER_TOTAL_LENGTH_VALID;
161 static_always_inline uword
162 avf_process_rx_burst (vlib_main_t * vm, vlib_node_runtime_t * node,
163 avf_per_thread_data_t * ptd, u32 n_left,
167 vlib_buffer_t **b = ptd->bufs;
168 u64 *qw1 = ptd->qw1s;
169 avf_rx_tail_t *tail = ptd->tails;
170 uword n_rx_bytes = 0;
172 /* copy template into local variable - will save per packet load */
173 vlib_buffer_copy_template (&bt, &ptd->buffer_template);
179 vlib_prefetch_buffer_header (b[8], LOAD);
180 vlib_prefetch_buffer_header (b[9], LOAD);
181 vlib_prefetch_buffer_header (b[10], LOAD);
182 vlib_prefetch_buffer_header (b[11], LOAD);
185 vlib_buffer_copy_template (b[0], &bt);
186 vlib_buffer_copy_template (b[1], &bt);
187 vlib_buffer_copy_template (b[2], &bt);
188 vlib_buffer_copy_template (b[3], &bt);
190 n_rx_bytes += b[0]->current_length = qw1[0] >> AVF_RXD_LEN_SHIFT;
191 n_rx_bytes += b[1]->current_length = qw1[1] >> AVF_RXD_LEN_SHIFT;
192 n_rx_bytes += b[2]->current_length = qw1[2] >> AVF_RXD_LEN_SHIFT;
193 n_rx_bytes += b[3]->current_length = qw1[3] >> AVF_RXD_LEN_SHIFT;
197 n_rx_bytes += avf_rx_attach_tail (vm, &bt, b[0], qw1[0], tail + 0);
198 n_rx_bytes += avf_rx_attach_tail (vm, &bt, b[1], qw1[1], tail + 1);
199 n_rx_bytes += avf_rx_attach_tail (vm, &bt, b[2], qw1[2], tail + 2);
200 n_rx_bytes += avf_rx_attach_tail (vm, &bt, b[3], qw1[3], tail + 3);
203 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
204 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[1]);
205 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[2]);
206 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[3]);
216 vlib_buffer_copy_template (b[0], &bt);
218 n_rx_bytes += b[0]->current_length = qw1[0] >> AVF_RXD_LEN_SHIFT;
221 n_rx_bytes += avf_rx_attach_tail (vm, &bt, b[0], qw1[0], tail + 0);
223 VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b[0]);
234 static_always_inline uword
235 avf_device_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
236 vlib_frame_t * frame, avf_device_t * ad, u16 qid)
238 avf_main_t *am = &avf_main;
239 vnet_main_t *vnm = vnet_get_main ();
240 u32 thr_idx = vlib_get_thread_index ();
241 avf_per_thread_data_t *ptd =
242 vec_elt_at_index (am->per_thread_data, thr_idx);
243 avf_rxq_t *rxq = vec_elt_at_index (ad->rxqs, qid);
244 u32 n_trace, n_rx_packets = 0, n_rx_bytes = 0;
247 u32 *bi, *to_next, n_left_to_next;
248 vlib_buffer_t *bt = &ptd->buffer_template;
249 u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
250 u16 next = rxq->next;
251 u16 size = rxq->size;
253 avf_rx_desc_t *d, *fd = rxq->descs;
254 #ifdef CLIB_HAVE_VEC256
255 u64x4 q1x4, or_q1x4 = { 0 };
256 u64x4 dd_eop_mask4 = u64x4_splat (AVF_RXD_STATUS_DD | AVF_RXD_STATUS_EOP);
259 /* is there anything on the ring */
261 if ((d->qword[1] & AVF_RXD_STATUS_DD) == 0)
264 if (PREDICT_FALSE (ad->per_interface_next_index != ~0))
265 next_index = ad->per_interface_next_index;
267 if (PREDICT_FALSE (vnet_device_input_have_features (ad->sw_if_index)))
268 vnet_feature_start_device_input_x1 (ad->sw_if_index, &next_index, bt);
270 vlib_get_new_next_frame (vm, node, next_index, to_next, n_left_to_next);
272 /* fetch up to AVF_RX_VECTOR_SZ from the rx ring, unflatten them and
273 copy needed data from descriptor to rx vector */
276 while (n_rx_packets < AVF_RX_VECTOR_SZ)
278 if (next + 11 < size)
281 CLIB_PREFETCH ((void *) (fd + (next + stride)),
282 CLIB_CACHE_LINE_BYTES, LOAD);
283 CLIB_PREFETCH ((void *) (fd + (next + stride + 1)),
284 CLIB_CACHE_LINE_BYTES, LOAD);
285 CLIB_PREFETCH ((void *) (fd + (next + stride + 2)),
286 CLIB_CACHE_LINE_BYTES, LOAD);
287 CLIB_PREFETCH ((void *) (fd + (next + stride + 3)),
288 CLIB_CACHE_LINE_BYTES, LOAD);
291 #ifdef CLIB_HAVE_VEC256
292 if (n_rx_packets >= AVF_RX_VECTOR_SZ - 4 || next >= size - 4)
295 q1x4 = u64x4_gather ((void *) &d[0].qword[1], (void *) &d[1].qword[1],
296 (void *) &d[2].qword[1], (void *) &d[3].qword[1]);
298 /* not all packets are ready or at least one of them is chained */
299 if (!u64x4_is_equal (q1x4 & dd_eop_mask4, dd_eop_mask4))
303 u64x4_store_unaligned (q1x4, ptd->qw1s + n_rx_packets);
304 vlib_buffer_copy_indices (bi, rxq->bufs + next, 4);
307 next = (next + 4) & mask;
314 CLIB_PREFETCH ((void *) (fd + ((next + 8) & mask)),
315 CLIB_CACHE_LINE_BYTES, LOAD);
317 if (avf_rxd_is_not_dd (d))
320 bi[0] = rxq->bufs[next];
322 /* deal with chained buffers */
323 if (PREDICT_FALSE (avf_rxd_is_not_eop (d)))
326 u16 tail_next = next;
327 avf_rx_tail_t *tail = ptd->tails + n_rx_packets;
331 tail_next = (tail_next + 1) & mask;
334 /* bail out in case of incomplete transaction */
335 if (avf_rxd_is_not_dd (td))
338 or_qw1 |= tail->qw1s[tail_desc] = td[0].qword[1];
339 tail->buffers[tail_desc] = rxq->bufs[tail_next];
342 while (avf_rxd_is_not_eop (td));
344 n_tail_desc += tail_desc;
347 or_qw1 |= ptd->qw1s[n_rx_packets] = d[0].qword[1];
350 next = (next + 1) & mask;
357 if (n_rx_packets == 0)
361 rxq->n_enqueued -= n_rx_packets + n_tail_desc;
363 #ifdef CLIB_HAVE_VEC256
364 or_qw1 |= or_q1x4[0] | or_q1x4[1] | or_q1x4[2] | or_q1x4[3];
368 if (ad->flags & AVF_DEVICE_F_VA_DMA)
369 avf_rxq_refill (vm, node, rxq, 1 /* use_va_dma */ );
371 avf_rxq_refill (vm, node, rxq, 0 /* use_va_dma */ );
373 vlib_get_buffers (vm, to_next, ptd->bufs, n_rx_packets);
375 vnet_buffer (bt)->sw_if_index[VLIB_RX] = ad->sw_if_index;
376 vnet_buffer (bt)->sw_if_index[VLIB_TX] = ~0;
377 bt->buffer_pool_index = rxq->buffer_pool_index;
381 n_rx_bytes = avf_process_rx_burst (vm, node, ptd, n_rx_packets, 1);
383 n_rx_bytes = avf_process_rx_burst (vm, node, ptd, n_rx_packets, 0);
385 /* packet trace if enabled */
386 if (PREDICT_FALSE ((n_trace = vlib_get_trace_count (vm, node))))
388 u32 n_left = n_rx_packets, i = 0, j;
391 while (n_trace && n_left)
394 avf_input_trace_t *tr;
395 b = vlib_get_buffer (vm, bi[0]);
396 vlib_trace_buffer (vm, node, next_index, b, /* follow_chain */ 0);
397 tr = vlib_add_trace (vm, node, b, sizeof (*tr));
398 tr->next_index = next_index;
400 tr->hw_if_index = ad->hw_if_index;
401 tr->qw1s[0] = ptd->qw1s[i];
402 for (j = 1; j < AVF_RX_MAX_DESC_IN_CHAIN; j++)
403 tr->qw1s[j] = ptd->tails[i].qw1s[j - 1];
411 vlib_set_trace_count (vm, node, n_trace);
414 if (PREDICT_TRUE (next_index == VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT))
416 vlib_next_frame_t *nf;
418 ethernet_input_frame_t *ef;
419 nf = vlib_node_runtime_get_next_frame (vm, node, next_index);
420 f = vlib_get_frame (vm, nf->frame);
421 f->flags = ETH_INPUT_FRAME_F_SINGLE_SW_IF_IDX;
423 ef = vlib_frame_scalar_args (f);
424 ef->sw_if_index = ad->sw_if_index;
425 ef->hw_if_index = ad->hw_if_index;
427 if ((or_qw1 & AVF_RXD_ERROR_IPE) == 0)
428 f->flags |= ETH_INPUT_FRAME_F_IP4_CKSUM_OK;
429 vlib_frame_no_append (f);
432 n_left_to_next -= n_rx_packets;
433 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
435 vlib_increment_combined_counter (vnm->interface_main.combined_sw_if_counters
436 + VNET_INTERFACE_COUNTER_RX, thr_idx,
437 ad->hw_if_index, n_rx_packets, n_rx_bytes);
443 VLIB_NODE_FN (avf_input_node) (vlib_main_t * vm, vlib_node_runtime_t * node,
444 vlib_frame_t * frame)
447 avf_main_t *am = &avf_main;
448 vnet_device_input_runtime_t *rt = (void *) node->runtime_data;
449 vnet_device_and_queue_t *dq;
451 foreach_device_and_queue (dq, rt->devices_and_queues)
454 ad = vec_elt_at_index (am->devices, dq->dev_instance);
455 if ((ad->flags & AVF_DEVICE_F_ADMIN_UP) == 0)
457 n_rx += avf_device_input_inline (vm, node, frame, ad, dq->queue_id);
463 VLIB_REGISTER_NODE (avf_input_node) = {
465 .sibling_of = "device-input",
466 .format_trace = format_avf_input_trace,
467 .type = VLIB_NODE_TYPE_INPUT,
468 .state = VLIB_NODE_STATE_DISABLED,
469 .n_errors = AVF_INPUT_N_ERROR,
470 .error_strings = avf_input_error_strings,
471 .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED,
478 * fd.io coding-style-patch-verification: ON
481 * eval: (c-set-style "gnu")