2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
15 #include <vnet/vnet.h>
16 #include <vppinfra/vec.h>
17 #include <vppinfra/error.h>
18 #include <vppinfra/format.h>
19 #include <vppinfra/xxhash.h>
21 #include <vnet/ethernet/ethernet.h>
22 #include <vnet/devices/dpdk/dpdk.h>
23 #include <vnet/classify/vnet_classify.h>
24 #include <vnet/mpls-gre/packet.h>
26 #include "dpdk_priv.h"
29 #define MAX(a,b) ((a) < (b) ? (b) : (a))
33 #define MIN(a,b) ((a) < (b) ? (a) : (b))
37 * At least in certain versions of ESXi, vmware e1000's don't honor the
38 * "strip rx CRC" bit. Set this flag to work around that bug FOR UNIT TEST ONLY.
40 * If wireshark complains like so:
42 * "Frame check sequence: 0x00000000 [incorrect, should be <hex-num>]"
43 * and you're using ESXi emulated e1000's, set this flag FOR UNIT TEST ONLY.
45 * Note: do NOT check in this file with this workaround enabled! You'll lose
46 * actual data from e.g. 10xGE interfaces. The extra 4 bytes annoy
47 * wireshark, but they're harmless...
49 #define VMWARE_LENGTH_BUG_WORKAROUND 0
52 u32 cached_next_index;
54 /* convenience variables */
55 vlib_main_t * vlib_main;
56 vnet_main_t * vnet_main;
57 } handoff_dispatch_main_t;
63 } handoff_dispatch_trace_t;
65 /* packet trace format function */
66 static u8 * format_handoff_dispatch_trace (u8 * s, va_list * args)
68 CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
69 CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
70 handoff_dispatch_trace_t * t = va_arg (*args, handoff_dispatch_trace_t *);
72 s = format (s, "HANDOFF_DISPATCH: sw_if_index %d next_index %d buffer 0x%x",
79 handoff_dispatch_main_t handoff_dispatch_main;
81 vlib_node_registration_t handoff_dispatch_node;
83 #define foreach_handoff_dispatch_error \
84 _(EXAMPLE, "example packets")
87 #define _(sym,str) HANDOFF_DISPATCH_ERROR_##sym,
88 foreach_handoff_dispatch_error
90 HANDOFF_DISPATCH_N_ERROR,
91 } handoff_dispatch_error_t;
93 static char * handoff_dispatch_error_strings[] = {
94 #define _(sym,string) string,
95 foreach_handoff_dispatch_error
100 void vlib_put_handoff_queue_elt (vlib_frame_queue_elt_t * hf)
102 CLIB_MEMORY_BARRIER();
107 handoff_dispatch_node_fn (vlib_main_t * vm,
108 vlib_node_runtime_t * node,
109 vlib_frame_t * frame)
111 u32 n_left_from, * from, * to_next;
112 dpdk_rx_next_t next_index;
114 from = vlib_frame_vector_args (frame);
115 n_left_from = frame->n_vectors;
116 next_index = node->cached_next_index;
118 while (n_left_from > 0)
122 vlib_get_next_frame (vm, node, next_index,
123 to_next, n_left_to_next);
125 while (n_left_from >= 4 && n_left_to_next >= 2)
128 vlib_buffer_t * b0, * b1;
130 u32 sw_if_index0, sw_if_index1;
132 /* Prefetch next iteration. */
134 vlib_buffer_t * p2, * p3;
136 p2 = vlib_get_buffer (vm, from[2]);
137 p3 = vlib_get_buffer (vm, from[3]);
139 vlib_prefetch_buffer_header (p2, LOAD);
140 vlib_prefetch_buffer_header (p3, LOAD);
143 /* speculatively enqueue b0 and b1 to the current next frame */
144 to_next[0] = bi0 = from[0];
145 to_next[1] = bi1 = from[1];
151 b0 = vlib_get_buffer (vm, bi0);
152 b1 = vlib_get_buffer (vm, bi1);
154 next0 = vnet_buffer(b0)->io_handoff.next_index;
155 next1 = vnet_buffer(b1)->io_handoff.next_index;
157 if (PREDICT_FALSE(vm->trace_main.trace_active_hint))
159 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
161 vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0);
162 handoff_dispatch_trace_t *t =
163 vlib_add_trace (vm, node, b0, sizeof (*t));
164 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
165 t->sw_if_index = sw_if_index0;
166 t->next_index = next0;
167 t->buffer_index = bi0;
169 if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
171 vlib_trace_buffer (vm, node, next1, b1, /* follow_chain */ 0);
172 handoff_dispatch_trace_t *t =
173 vlib_add_trace (vm, node, b1, sizeof (*t));
174 sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
175 t->sw_if_index = sw_if_index1;
176 t->next_index = next1;
177 t->buffer_index = bi1;
181 /* verify speculative enqueues, maybe switch current next frame */
182 vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
183 to_next, n_left_to_next,
184 bi0, bi1, next0, next1);
187 while (n_left_from > 0 && n_left_to_next > 0)
194 /* speculatively enqueue b0 to the current next frame */
202 b0 = vlib_get_buffer (vm, bi0);
204 next0 = vnet_buffer(b0)->io_handoff.next_index;
206 if (PREDICT_FALSE(vm->trace_main.trace_active_hint))
208 if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
210 vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0);
211 handoff_dispatch_trace_t *t =
212 vlib_add_trace (vm, node, b0, sizeof (*t));
213 sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
214 t->sw_if_index = sw_if_index0;
215 t->next_index = next0;
216 t->buffer_index = bi0;
220 /* verify speculative enqueue, maybe switch current next frame */
221 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
222 to_next, n_left_to_next,
226 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
229 return frame->n_vectors;
232 VLIB_REGISTER_NODE (handoff_dispatch_node) = {
233 .function = handoff_dispatch_node_fn,
234 .name = "handoff-dispatch",
235 .vector_size = sizeof (u32),
236 .format_trace = format_handoff_dispatch_trace,
237 .type = VLIB_NODE_TYPE_INTERNAL,
238 .flags = VLIB_NODE_FLAG_IS_HANDOFF,
240 .n_errors = ARRAY_LEN(handoff_dispatch_error_strings),
241 .error_strings = handoff_dispatch_error_strings,
243 .n_next_nodes = DPDK_RX_N_NEXT,
246 [DPDK_RX_NEXT_DROP] = "error-drop",
247 [DPDK_RX_NEXT_ETHERNET_INPUT] = "ethernet-input",
248 [DPDK_RX_NEXT_IP4_INPUT] = "ip4-input",
249 [DPDK_RX_NEXT_IP6_INPUT] = "ip6-input",
250 [DPDK_RX_NEXT_MPLS_INPUT] = "mpls-gre-input",
254 VLIB_NODE_FUNCTION_MULTIARCH (handoff_dispatch_node, handoff_dispatch_node_fn)
256 clib_error_t *handoff_dispatch_init (vlib_main_t *vm)
258 handoff_dispatch_main_t * mp = &handoff_dispatch_main;
261 mp->vnet_main = &vnet_main;
266 VLIB_INIT_FUNCTION (handoff_dispatch_init);
268 u32 dpdk_get_handoff_node_index (void)
270 return handoff_dispatch_node.index;
273 static char * dpdk_error_strings[] = {
280 dpdk_rx_next_and_error_from_mb_flags_x1 (dpdk_device_t *xd, struct rte_mbuf *mb,
282 u8 * next0, u8 * error0)
284 u8 is0_ip4, is0_ip6, is0_mpls, n0;
285 uint16_t mb_flags = mb->ol_flags;
287 if (PREDICT_FALSE(mb_flags & (
288 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
289 PKT_EXT_RX_PKT_ERROR | PKT_EXT_RX_BAD_FCS |
290 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
291 PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD
294 /* some error was flagged. determine the drop reason */
295 n0 = DPDK_RX_NEXT_DROP;
297 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
298 (mb_flags & PKT_EXT_RX_PKT_ERROR) ? DPDK_ERROR_RX_PACKET_ERROR :
299 (mb_flags & PKT_EXT_RX_BAD_FCS) ? DPDK_ERROR_RX_BAD_FCS :
300 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
301 (mb_flags & PKT_RX_IP_CKSUM_BAD) ? DPDK_ERROR_IP_CHECKSUM_ERROR :
302 (mb_flags & PKT_RX_L4_CKSUM_BAD) ? DPDK_ERROR_L4_CHECKSUM_ERROR :
307 *error0 = DPDK_ERROR_NONE;
308 if (xd->per_interface_next_index != ~0)
309 n0 = xd->per_interface_next_index;
310 else if (mb_flags & PKT_RX_VLAN_PKT)
311 n0 = DPDK_RX_NEXT_ETHERNET_INPUT;
314 n0 = DPDK_RX_NEXT_ETHERNET_INPUT;
315 #if RTE_VERSION >= RTE_VERSION_NUM(2, 1, 0, 0)
316 is0_ip4 = RTE_ETH_IS_IPV4_HDR(mb->packet_type) != 0;
318 is0_ip4 = (mb_flags & (PKT_RX_IPV4_HDR | PKT_RX_IPV4_HDR_EXT)) != 0;
321 if (PREDICT_TRUE(is0_ip4))
322 n0 = DPDK_RX_NEXT_IP4_INPUT;
325 #if RTE_VERSION >= RTE_VERSION_NUM(2, 1, 0, 0)
326 is0_ip6 = RTE_ETH_IS_IPV6_HDR(mb->packet_type) != 0;
329 (mb_flags & (PKT_RX_IPV6_HDR | PKT_RX_IPV6_HDR_EXT)) != 0;
331 if (PREDICT_TRUE(is0_ip6))
332 n0 = DPDK_RX_NEXT_IP6_INPUT;
335 ethernet_header_t *h0 = (ethernet_header_t *) b0->data;
336 is0_mpls = (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_MPLS_UNICAST));
337 n0 = is0_mpls ? DPDK_RX_NEXT_MPLS_INPUT : n0;
345 void dpdk_rx_trace (dpdk_main_t * dm,
346 vlib_node_runtime_t * node,
352 vlib_main_t * vm = vlib_get_main();
363 dpdk_rx_dma_trace_t * t0;
370 b0 = vlib_get_buffer (vm, bi0);
371 mb = rte_mbuf_from_vlib_buffer(b0);
372 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
374 vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0);
375 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
376 t0->queue_index = queue_id;
377 t0->device_index = xd->device_index;
378 t0->buffer_index = bi0;
380 clib_memcpy (&t0->mb, mb, sizeof (t0->mb));
381 clib_memcpy (&t0->buffer, b0, sizeof (b0[0]) - sizeof (b0->pre_data));
382 clib_memcpy (t0->buffer.pre_data, b0->data, sizeof (t0->buffer.pre_data));
384 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
386 * Clear overloaded TX offload flags when a DPDK driver
387 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
389 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
390 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
397 * dpdk_efd_update_counters()
398 * Update EFD (early-fast-discard) counters
400 void dpdk_efd_update_counters (dpdk_device_t *xd,
404 if (enabled & DPDK_EFD_MONITOR_ENABLED)
406 u64 now = clib_cpu_time_now();
407 if (xd->efd_agent.last_poll_time > 0)
409 u64 elapsed_time = (now - xd->efd_agent.last_poll_time);
410 if (elapsed_time > xd->efd_agent.max_poll_delay)
411 xd->efd_agent.max_poll_delay = elapsed_time;
413 xd->efd_agent.last_poll_time = now;
416 xd->efd_agent.total_packet_cnt += n_buffers;
417 xd->efd_agent.last_burst_sz = n_buffers;
419 if (n_buffers > xd->efd_agent.max_burst_sz)
420 xd->efd_agent.max_burst_sz = n_buffers;
422 if (PREDICT_FALSE(n_buffers == VLIB_FRAME_SIZE))
424 xd->efd_agent.full_frames_cnt++;
425 xd->efd_agent.consec_full_frames_cnt++;
429 xd->efd_agent.consec_full_frames_cnt = 0;
433 /* is_efd_discardable()
434 * returns non zero DPDK error if packet meets early-fast-discard criteria,
437 u32 is_efd_discardable (vlib_thread_main_t *tm,
441 ethernet_header_t *eh = (ethernet_header_t *) b0->data;
443 if (eh->type == clib_host_to_net_u16(ETHERNET_TYPE_IP4))
446 (ip4_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
447 u8 pkt_prec = (ipv4->tos >> 5);
449 return (tm->efd.ip_prec_bitmap & (1 << pkt_prec) ?
450 DPDK_ERROR_IPV4_EFD_DROP_PKTS : DPDK_ERROR_NONE);
452 else if (eh->type == clib_net_to_host_u16(ETHERNET_TYPE_IP6))
455 (ip6_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
457 ((ipv6->ip_version_traffic_class_and_flow_label >> 20) & 0xff);
459 return (tm->efd.ip_prec_bitmap & (1 << pkt_tclass) ?
460 DPDK_ERROR_IPV6_EFD_DROP_PKTS : DPDK_ERROR_NONE);
462 else if (eh->type == clib_net_to_host_u16(ETHERNET_TYPE_MPLS_UNICAST))
464 mpls_unicast_header_t *mpls =
465 (mpls_unicast_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
466 u8 pkt_exp = ((mpls->label_exp_s_ttl >> 9) & 0x07);
468 return (tm->efd.mpls_exp_bitmap & (1 << pkt_exp) ?
469 DPDK_ERROR_MPLS_EFD_DROP_PKTS : DPDK_ERROR_NONE);
471 else if ((eh->type == clib_net_to_host_u16(ETHERNET_TYPE_VLAN)) ||
472 (eh->type == clib_net_to_host_u16(ETHERNET_TYPE_DOT1AD)))
474 ethernet_vlan_header_t *vlan =
475 (ethernet_vlan_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
476 u8 pkt_cos = ((vlan->priority_cfi_and_id >> 13) & 0x07);
478 return (tm->efd.vlan_cos_bitmap & (1 << pkt_cos) ?
479 DPDK_ERROR_VLAN_EFD_DROP_PKTS : DPDK_ERROR_NONE);
482 return DPDK_ERROR_NONE;
486 * This function is used when there are no worker threads.
487 * The main thread performs IO and forwards the packets.
489 static inline u32 dpdk_device_input ( dpdk_main_t * dm,
491 vlib_node_runtime_t * node,
497 u32 next_index = DPDK_RX_NEXT_ETHERNET_INPUT;
498 u32 n_left_to_next, * to_next;
500 vlib_main_t * vm = vlib_get_main();
501 uword n_rx_bytes = 0;
502 u32 n_trace, trace_cnt __attribute__((unused));
503 vlib_buffer_free_list_t * fl;
504 u8 efd_discard_burst = 0;
505 u16 ip_align_offset = 0;
506 u32 buffer_flags_template;
508 if (xd->admin_up == 0)
511 n_buffers = dpdk_rx_burst(dm, xd, queue_id);
515 /* check if EFD (dpdk) is enabled */
516 if (PREDICT_FALSE(use_efd && dm->efd.enabled))
518 /* reset a few stats */
519 xd->efd_agent.last_poll_time = 0;
520 xd->efd_agent.last_burst_sz = 0;
525 if (xd->pmd == VNET_DPDK_PMD_THUNDERX)
528 buffer_flags_template = dm->buffer_flags_template;
530 vec_reset_length (xd->d_trace_buffers);
531 trace_cnt = n_trace = vlib_get_trace_count (vm, node);
533 fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
536 * DAW-FIXME: VMXNET3 device stop/start doesn't work,
537 * therefore fake the stop in the dpdk driver by
538 * silently dropping all of the incoming pkts instead of
539 * stopping the driver / hardware.
541 if (PREDICT_FALSE(xd->admin_up != 1))
543 for (mb_index = 0; mb_index < n_buffers; mb_index++)
544 rte_pktmbuf_free (xd->rx_vectors[queue_id][mb_index]);
549 /* Check for congestion if EFD (Early-Fast-Discard) is enabled
550 * in any mode (e.g. dpdk, monitor, or drop_all)
552 if (PREDICT_FALSE(use_efd && dm->efd.enabled))
554 /* update EFD counters */
555 dpdk_efd_update_counters(xd, n_buffers, dm->efd.enabled);
557 if (PREDICT_FALSE(dm->efd.enabled & DPDK_EFD_DROPALL_ENABLED))
559 /* discard all received packets */
560 for (mb_index = 0; mb_index < n_buffers; mb_index++)
561 rte_pktmbuf_free(xd->rx_vectors[queue_id][mb_index]);
563 xd->efd_agent.discard_cnt += n_buffers;
564 increment_efd_drop_counter(vm,
565 DPDK_ERROR_VLAN_EFD_DROP_PKTS,
571 if (PREDICT_FALSE(xd->efd_agent.consec_full_frames_cnt >=
572 dm->efd.consec_full_frames_hi_thresh))
574 u32 device_queue_sz = rte_eth_rx_queue_count(xd->device_index,
576 if (device_queue_sz >= dm->efd.queue_hi_thresh)
578 /* dpdk device queue has reached the critical threshold */
579 xd->efd_agent.congestion_cnt++;
581 /* apply EFD to packets from the burst */
582 efd_discard_burst = 1;
589 while (n_buffers > 0)
594 vlib_buffer_t * b0, * b_seg, * b_chain = 0;
597 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
599 while (n_buffers > 0 && n_left_to_next > 0)
602 struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index];
603 struct rte_mbuf *mb_seg = mb->next;
605 if (PREDICT_TRUE(n_buffers > 2))
607 struct rte_mbuf *pfmb = xd->rx_vectors[queue_id][mb_index+2];
608 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
609 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, STORE);
610 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
615 b0 = vlib_buffer_from_rte_mbuf(mb);
617 /* check whether EFD is looking for packets to discard */
618 if (PREDICT_FALSE(efd_discard_burst))
620 vlib_thread_main_t * tm = vlib_get_thread_main();
622 if (PREDICT_TRUE(cntr_type = is_efd_discardable(tm, b0, mb)))
624 rte_pktmbuf_free(mb);
625 xd->efd_agent.discard_cnt++;
626 increment_efd_drop_counter(vm,
635 /* Prefetch one next segment if it exists. */
636 if (PREDICT_FALSE(mb->nb_segs > 1))
638 struct rte_mbuf *pfmb = mb->next;
639 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
640 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
641 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
645 vlib_buffer_init_for_free_list (b0, fl);
648 bi0 = vlib_get_buffer_index (vm, b0);
654 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
656 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
658 * Clear overloaded TX offload flags when a DPDK driver
659 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
662 if (PREDICT_TRUE(trace_cnt == 0))
663 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
666 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
668 b0->error = node->errors[error0];
670 l3_offset0 = ((next0 == DPDK_RX_NEXT_IP4_INPUT ||
671 next0 == DPDK_RX_NEXT_IP6_INPUT ||
672 next0 == DPDK_RX_NEXT_MPLS_INPUT) ?
673 sizeof (ethernet_header_t) : 0);
675 b0->current_data = l3_offset0;
676 b0->current_length = mb->data_len - l3_offset0;
678 if (PREDICT_FALSE (ip_align_offset != 0))
680 if (next0 == DPDK_RX_NEXT_IP4_INPUT ||
681 next0 == DPDK_RX_NEXT_IP6_INPUT)
682 b0->current_data += ip_align_offset;
685 b0->flags = buffer_flags_template;
687 if (VMWARE_LENGTH_BUG_WORKAROUND)
688 b0->current_length -= 4;
690 vnet_buffer(b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
691 vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
692 n_rx_bytes += mb->pkt_len;
694 /* Process subsequent segments of multi-segment packets */
695 while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
699 b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
700 vlib_buffer_init_for_free_list (b_seg, fl);
701 b_seg->clone_count = 0;
703 ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
704 ASSERT(b_seg->current_data == 0);
707 * The driver (e.g. virtio) may not put the packet data at the start
708 * of the segment, so don't assume b_seg->current_data == 0 is correct.
710 b_seg->current_data = (mb_seg->buf_addr + mb_seg->data_off) - (void *)b_seg->data;
712 b_seg->current_length = mb_seg->data_len;
713 b0->total_length_not_including_first_buffer +=
716 b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
717 b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
720 mb_seg = mb_seg->next;
725 * Turn this on if you run into
726 * "bad monkey" contexts, and you want to know exactly
727 * which nodes they've visited... See main.c...
729 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
731 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
732 to_next, n_left_to_next,
734 if (PREDICT_FALSE (n_trace > mb_index))
735 vec_add1 (xd->d_trace_buffers, bi0);
739 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
742 if (PREDICT_FALSE (vec_len (xd->d_trace_buffers) > 0))
744 dpdk_rx_trace (dm, node, xd, queue_id, xd->d_trace_buffers,
745 vec_len (xd->d_trace_buffers));
746 vlib_set_trace_count (vm, node, n_trace - vec_len (xd->d_trace_buffers));
749 vlib_increment_combined_counter
750 (vnet_get_main()->interface_main.combined_sw_if_counters
751 + VNET_INTERFACE_COUNTER_RX,
753 xd->vlib_sw_if_index,
754 mb_index, n_rx_bytes);
756 dpdk_worker_t * dw = vec_elt_at_index(dm->workers, cpu_index);
757 dw->aggregate_rx_packets += mb_index;
763 #define VIRL_SPEED_LIMIT() \
764 /* Limit the input rate to 1000 vectors / sec */ \
766 struct timespec ts, tsrem; \
769 ts.tv_nsec = 1000*1000; /* 1ms */ \
771 while (nanosleep(&ts, &tsrem) < 0) \
777 #define VIRL_SPEED_LIMIT()
782 dpdk_input (vlib_main_t * vm,
783 vlib_node_runtime_t * node,
786 dpdk_main_t * dm = &dpdk_main;
788 uword n_rx_packets = 0;
789 dpdk_device_and_queue_t * dq;
790 u32 cpu_index = os_get_cpu_number();
793 * Poll all devices on this cpu for input/interrupts.
795 vec_foreach (dq, dm->devices_by_cpu[cpu_index])
797 xd = vec_elt_at_index(dm->devices, dq->device);
798 ASSERT(dq->queue_id == 0);
799 n_rx_packets += dpdk_device_input (dm, xd, node, cpu_index, 0, 0);
808 dpdk_input_rss (vlib_main_t * vm,
809 vlib_node_runtime_t * node,
812 dpdk_main_t * dm = &dpdk_main;
814 uword n_rx_packets = 0;
815 dpdk_device_and_queue_t * dq;
816 u32 cpu_index = os_get_cpu_number();
819 * Poll all devices on this cpu for input/interrupts.
821 vec_foreach (dq, dm->devices_by_cpu[cpu_index])
823 xd = vec_elt_at_index(dm->devices, dq->device);
824 n_rx_packets += dpdk_device_input (dm, xd, node, cpu_index, dq->queue_id, 0);
833 dpdk_input_efd (vlib_main_t * vm,
834 vlib_node_runtime_t * node,
837 dpdk_main_t * dm = &dpdk_main;
839 uword n_rx_packets = 0;
840 dpdk_device_and_queue_t * dq;
841 u32 cpu_index = os_get_cpu_number();
844 * Poll all devices on this cpu for input/interrupts.
846 vec_foreach (dq, dm->devices_by_cpu[cpu_index])
848 xd = vec_elt_at_index(dm->devices, dq->device);
849 n_rx_packets += dpdk_device_input (dm, xd, node, cpu_index, dq->queue_id, 1);
858 VLIB_REGISTER_NODE (dpdk_input_node) = {
859 .function = dpdk_input,
860 .type = VLIB_NODE_TYPE_INPUT,
861 .name = "dpdk-input",
863 /* Will be enabled if/when hardware is detected. */
864 .state = VLIB_NODE_STATE_DISABLED,
866 .format_buffer = format_ethernet_header_with_length,
867 .format_trace = format_dpdk_rx_dma_trace,
869 .n_errors = DPDK_N_ERROR,
870 .error_strings = dpdk_error_strings,
872 .n_next_nodes = DPDK_RX_N_NEXT,
874 [DPDK_RX_NEXT_DROP] = "error-drop",
875 [DPDK_RX_NEXT_ETHERNET_INPUT] = "ethernet-input",
876 [DPDK_RX_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
877 [DPDK_RX_NEXT_IP6_INPUT] = "ip6-input",
878 [DPDK_RX_NEXT_MPLS_INPUT] = "mpls-gre-input",
883 /* handle dpdk_input_rss alternative function */
884 VLIB_NODE_FUNCTION_MULTIARCH_CLONE(dpdk_input)
885 VLIB_NODE_FUNCTION_MULTIARCH_CLONE(dpdk_input_rss)
886 VLIB_NODE_FUNCTION_MULTIARCH_CLONE(dpdk_input_efd)
888 /* this macro defines dpdk_input_rss_multiarch_select() */
889 CLIB_MULTIARCH_SELECT_FN(dpdk_input);
890 CLIB_MULTIARCH_SELECT_FN(dpdk_input_rss);
891 CLIB_MULTIARCH_SELECT_FN(dpdk_input_efd);
894 * Override the next nodes for the dpdk input nodes.
895 * Must be invoked prior to VLIB_INIT_FUNCTION calls.
897 void dpdk_set_next_node (dpdk_rx_next_t next, char *name)
899 vlib_node_registration_t *r = &dpdk_input_node;
900 vlib_node_registration_t *r_io = &dpdk_io_input_node;
901 vlib_node_registration_t *r_handoff = &handoff_dispatch_node;
905 case DPDK_RX_NEXT_IP4_INPUT:
906 case DPDK_RX_NEXT_IP6_INPUT:
907 case DPDK_RX_NEXT_MPLS_INPUT:
908 case DPDK_RX_NEXT_ETHERNET_INPUT:
909 r->next_nodes[next] = name;
910 r_io->next_nodes[next] = name;
911 r_handoff->next_nodes[next] = name;
915 clib_warning ("%s: illegal next %d\n", __FUNCTION__, next);
920 inline vlib_frame_queue_elt_t *
921 vlib_get_handoff_queue_elt (u32 vlib_worker_index)
923 vlib_frame_queue_t *fq;
924 vlib_frame_queue_elt_t *elt;
927 fq = vlib_frame_queues[vlib_worker_index];
930 new_tail = __sync_add_and_fetch (&fq->tail, 1);
932 /* Wait until a ring slot is available */
933 while (new_tail >= fq->head_hint + fq->nelts)
934 vlib_worker_thread_barrier_check ();
936 elt = fq->elts + (new_tail & (fq->nelts-1));
938 /* this would be very bad... */
942 elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
943 elt->last_n_vectors = elt->n_vectors = 0;
948 static inline vlib_frame_queue_elt_t *
949 dpdk_get_handoff_queue_elt (
950 u32 vlib_worker_index,
951 vlib_frame_queue_elt_t ** handoff_queue_elt_by_worker_index)
953 vlib_frame_queue_elt_t *elt;
955 if (handoff_queue_elt_by_worker_index [vlib_worker_index])
956 return handoff_queue_elt_by_worker_index [vlib_worker_index];
958 elt = vlib_get_handoff_queue_elt (vlib_worker_index);
960 handoff_queue_elt_by_worker_index [vlib_worker_index] = elt;
965 static inline vlib_frame_queue_t *
966 is_vlib_handoff_queue_congested (
967 u32 vlib_worker_index,
969 vlib_frame_queue_t ** handoff_queue_by_worker_index)
971 vlib_frame_queue_t *fq;
973 fq = handoff_queue_by_worker_index [vlib_worker_index];
974 if (fq != (vlib_frame_queue_t *)(~0))
977 fq = vlib_frame_queues[vlib_worker_index];
980 if (PREDICT_FALSE(fq->tail >= (fq->head_hint + queue_hi_thresh))) {
981 /* a valid entry in the array will indicate the queue has reached
982 * the specified threshold and is congested
984 handoff_queue_by_worker_index [vlib_worker_index] = fq;
985 fq->enqueue_full_events++;
992 static inline u64 ipv4_get_key (ip4_header_t *ip)
996 hash_key = *((u64*)(&ip->address_pair)) ^ ip->protocol;
1001 static inline u64 ipv6_get_key (ip6_header_t *ip)
1005 hash_key = ip->src_address.as_u64[0] ^
1006 rotate_left(ip->src_address.as_u64[1],13) ^
1007 rotate_left(ip->dst_address.as_u64[0],26) ^
1008 rotate_left(ip->dst_address.as_u64[1],39) ^
1015 #define MPLS_BOTTOM_OF_STACK_BIT_MASK 0x00000100U
1016 #define MPLS_LABEL_MASK 0xFFFFF000U
1018 static inline u64 mpls_get_key (mpls_unicast_header_t *m)
1024 /* find the bottom of the MPLS label stack. */
1025 if (PREDICT_TRUE(m->label_exp_s_ttl &
1026 clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK))) {
1027 goto bottom_lbl_found;
1031 if (PREDICT_TRUE(m->label_exp_s_ttl &
1032 clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK))) {
1033 goto bottom_lbl_found;
1037 if (m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK)) {
1038 goto bottom_lbl_found;
1042 if (m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK)) {
1043 goto bottom_lbl_found;
1047 if (m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK)) {
1048 goto bottom_lbl_found;
1051 /* the bottom label was not found - use the last label */
1052 hash_key = m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_LABEL_MASK);
1059 ip_ver = (*((u8 *)m) >> 4);
1061 /* find out if it is IPV4 or IPV6 header */
1062 if (PREDICT_TRUE(ip_ver == 4)) {
1063 hash_key = ipv4_get_key((ip4_header_t *)m);
1064 } else if (PREDICT_TRUE(ip_ver == 6)) {
1065 hash_key = ipv6_get_key((ip6_header_t *)m);
1067 /* use the bottom label */
1068 hash_key = (m-1)->label_exp_s_ttl & clib_net_to_host_u32(MPLS_LABEL_MASK);
1075 static inline u64 eth_get_key (ethernet_header_t *h0)
1080 if (PREDICT_TRUE(h0->type) == clib_host_to_net_u16(ETHERNET_TYPE_IP4)) {
1081 hash_key = ipv4_get_key((ip4_header_t *)(h0+1));
1082 } else if (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_IP6)) {
1083 hash_key = ipv6_get_key((ip6_header_t *)(h0+1));
1084 } else if (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_MPLS_UNICAST)) {
1085 hash_key = mpls_get_key((mpls_unicast_header_t *)(h0+1));
1086 } else if ((h0->type == clib_host_to_net_u16(ETHERNET_TYPE_VLAN)) ||
1087 (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_DOT1AD))) {
1088 ethernet_vlan_header_t * outer = (ethernet_vlan_header_t *)(h0 + 1);
1090 outer = (outer->type == clib_host_to_net_u16(ETHERNET_TYPE_VLAN)) ?
1092 if (PREDICT_TRUE(outer->type) == clib_host_to_net_u16(ETHERNET_TYPE_IP4)) {
1093 hash_key = ipv4_get_key((ip4_header_t *)(outer+1));
1094 } else if (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6)) {
1095 hash_key = ipv6_get_key((ip6_header_t *)(outer+1));
1096 } else if (outer->type == clib_host_to_net_u16(ETHERNET_TYPE_MPLS_UNICAST)) {
1097 hash_key = mpls_get_key((mpls_unicast_header_t *)(outer+1));
1099 hash_key = outer->type;
1109 * This function is used when dedicated IO threads feed the worker threads.
1111 * Devices are allocated to this thread based on instances and instance_id.
1112 * If instances==0 then the function automatically determines the number
1113 * of instances of this thread, and allocates devices between them.
1114 * If instances != 0, then instance_id must be in the range 0..instances-1.
1115 * The function allocates devices among the specified number of instances,
1116 * with this thread having the given instance id. This option is used for
1117 * splitting devices among differently named "io"-type threads.
1119 void dpdk_io_thread (vlib_worker_thread_t * w,
1123 dpdk_io_thread_callback_t callback)
1125 vlib_main_t * vm = vlib_get_main();
1126 vlib_thread_main_t * tm = vlib_get_thread_main();
1127 vlib_thread_registration_t * tr;
1128 dpdk_main_t * dm = &dpdk_main;
1129 char *io_name = w->registration->name;
1131 dpdk_device_t ** my_devices = 0;
1132 vlib_frame_queue_elt_t ** handoff_queue_elt_by_worker_index = 0;
1133 vlib_frame_queue_t ** congested_handoff_queue_by_worker_index = 0;
1134 vlib_frame_queue_elt_t * hf = 0;
1136 u32 n_left_to_next_worker = 0, * to_next_worker = 0;
1137 u32 next_worker_index = 0;
1138 u32 current_worker_index = ~0;
1139 u32 cpu_index = os_get_cpu_number();
1140 u32 num_workers = 0;
1141 u32 num_devices = 0;
1144 vlib_node_runtime_t * node_trace = 0;
1145 u32 first_worker_index = 0;
1146 u32 buffer_flags_template;
1148 /* Wait until the dpdk init sequence is complete */
1149 while (dm->io_thread_release == 0)
1150 vlib_worker_thread_barrier_check();
1152 clib_time_init (&vm->clib_time);
1154 p = hash_get_mem (tm->thread_registrations_by_name, worker_name);
1156 tr = (vlib_thread_registration_t *) p[0];
1159 num_workers = tr->count;
1160 first_worker_index = tr->first_index;
1163 /* Allocate devices to this thread */
1167 instance_id = w->instance_id;
1169 p = hash_get_mem (tm->thread_registrations_by_name, io_name);
1170 tr = (vlib_thread_registration_t *) p[0];
1171 /* Otherwise, how did we get here */
1172 ASSERT (tr && tr->count);
1173 instances = tr->count;
1177 /* manually assign */
1178 ASSERT (instance_id < instances);
1181 vec_validate (handoff_queue_elt_by_worker_index,
1182 first_worker_index + num_workers - 1);
1184 vec_validate_init_empty (congested_handoff_queue_by_worker_index,
1185 first_worker_index + num_workers - 1,
1186 (vlib_frame_queue_t *)(~0));
1188 buffer_flags_template = dm->buffer_flags_template;
1190 /* And handle them... */
1195 uword n_rx_bytes = 0;
1196 u32 n_trace, trace_cnt __attribute__((unused));
1197 vlib_buffer_free_list_t * fl;
1200 u8 efd_discard_burst;
1202 vlib_worker_thread_barrier_check ();
1204 /* Invoke callback if supplied */
1205 if (PREDICT_FALSE(callback != NULL))
1208 if (PREDICT_FALSE(vec_len(dm->devices) != num_devices))
1210 vec_reset_length(my_devices);
1211 vec_foreach (xd, dm->devices)
1213 if (((xd - dm->devices) % tr->count) == instance_id)
1215 fprintf(stderr, "i/o thread %d (cpu %d) takes port %d\n",
1216 instance_id, (int) os_get_cpu_number(), (int) (xd - dm->devices));
1217 vec_add1 (my_devices, xd);
1220 num_devices = vec_len(dm->devices);
1223 for (i = 0; i < vec_len (my_devices); i++)
1230 n_buffers = dpdk_rx_burst(dm, xd, 0 /* queue_id */);
1234 /* check if EFD (dpdk) is enabled */
1235 if (PREDICT_FALSE(dm->efd.enabled))
1237 /* reset a few stats */
1238 xd->efd_agent.last_poll_time = 0;
1239 xd->efd_agent.last_burst_sz = 0;
1244 trace_cnt = n_trace = 0;
1245 if (PREDICT_FALSE(vm->trace_main.trace_active_hint))
1248 * packet tracing is triggered on the dpdk-input node for
1249 * ease-of-use. Re-fetch the node_runtime for dpdk-input
1250 * in case it has changed.
1252 node_trace = vlib_node_get_runtime (vm, dpdk_input_node.index);
1254 vec_reset_length (xd->d_trace_buffers);
1255 trace_cnt = n_trace = vlib_get_trace_count (vm, node_trace);
1259 * DAW-FIXME: VMXNET3 device stop/start doesn't work,
1260 * therefore fake the stop in the dpdk driver by
1261 * silently dropping all of the incoming pkts instead of
1262 * stopping the driver / hardware.
1264 if (PREDICT_FALSE(xd->admin_up != 1))
1266 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1267 rte_pktmbuf_free (xd->rx_vectors[queue_id][mb_index]);
1271 /* reset EFD action for the burst */
1272 efd_discard_burst = 0;
1274 /* Check for congestion if EFD (Early-Fast-Discard) is enabled
1275 * in any mode (e.g. dpdk, monitor, or drop_all)
1277 if (PREDICT_FALSE(dm->efd.enabled))
1279 /* update EFD counters */
1280 dpdk_efd_update_counters(xd, n_buffers, dm->efd.enabled);
1282 if (PREDICT_FALSE(dm->efd.enabled & DPDK_EFD_DROPALL_ENABLED))
1284 /* drop all received packets */
1285 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1286 rte_pktmbuf_free(xd->rx_vectors[queue_id][mb_index]);
1288 xd->efd_agent.discard_cnt += n_buffers;
1289 increment_efd_drop_counter(vm,
1290 DPDK_ERROR_VLAN_EFD_DROP_PKTS,
1296 if (PREDICT_FALSE(xd->efd_agent.consec_full_frames_cnt >=
1297 dm->efd.consec_full_frames_hi_thresh))
1299 u32 device_queue_sz = rte_eth_rx_queue_count(xd->device_index,
1301 if (device_queue_sz >= dm->efd.queue_hi_thresh)
1303 /* dpdk device queue has reached the critical threshold */
1304 xd->efd_agent.congestion_cnt++;
1306 /* apply EFD to packets from the burst */
1307 efd_discard_burst = 1;
1312 fl = vlib_buffer_get_free_list
1313 (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
1317 while (n_buffers > 0)
1322 vlib_buffer_t * b0, * b_seg, * b_chain = 0;
1323 ethernet_header_t * h0;
1325 struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index];
1326 struct rte_mbuf *mb_seg = mb->next;
1328 if (PREDICT_TRUE(n_buffers > 1))
1330 struct rte_mbuf *pfmb = xd->rx_vectors[queue_id][mb_index+2];
1331 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1332 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1333 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1334 CLIB_PREFETCH (bp->data, CLIB_CACHE_LINE_BYTES, LOAD);
1337 b0 = vlib_buffer_from_rte_mbuf(mb);
1339 /* check whether EFD is looking for packets to discard */
1340 if (PREDICT_FALSE(efd_discard_burst))
1343 if (PREDICT_TRUE(cntr_type = is_efd_discardable(tm, b0, mb)))
1345 rte_pktmbuf_free(mb);
1346 xd->efd_agent.discard_cnt++;
1347 increment_efd_drop_counter(vm,
1357 /* Prefetch one next segment if it exists */
1358 if (PREDICT_FALSE(mb->nb_segs > 1))
1360 struct rte_mbuf *pfmb = mb->next;
1361 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1362 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1363 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1367 bi0 = vlib_get_buffer_index (vm, b0);
1368 vlib_buffer_init_for_free_list (b0, fl);
1369 b0->clone_count = 0;
1371 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
1373 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
1375 * Clear overloaded TX offload flags when a DPDK driver
1376 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
1378 if (PREDICT_TRUE(trace_cnt == 0))
1379 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
1382 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
1385 clib_warning ("bi %d error %d", bi0, error0);
1389 l3_offset0 = ((next0 == DPDK_RX_NEXT_IP4_INPUT ||
1390 next0 == DPDK_RX_NEXT_IP6_INPUT ||
1391 next0 == DPDK_RX_NEXT_MPLS_INPUT) ?
1392 sizeof (ethernet_header_t) : 0);
1394 b0->current_data = l3_offset0;
1395 b0->current_length = mb->data_len - l3_offset0;
1397 b0->flags = buffer_flags_template;
1399 if (VMWARE_LENGTH_BUG_WORKAROUND)
1400 b0->current_length -= 4;
1402 vnet_buffer(b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
1403 vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
1404 vnet_buffer(b0)->io_handoff.next_index = next0;
1405 n_rx_bytes += mb->pkt_len;
1407 /* Process subsequent segments of multi-segment packets */
1408 while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
1410 ASSERT(mb_seg != 0);
1412 b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
1413 vlib_buffer_init_for_free_list (b_seg, fl);
1414 b_seg->clone_count = 0;
1416 ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1417 ASSERT(b_seg->current_data == 0);
1420 * The driver (e.g. virtio) may not put the packet data at the start
1421 * of the segment, so don't assume b_seg->current_data == 0 is correct.
1423 b_seg->current_data = (mb_seg->buf_addr + mb_seg->data_off) - (void *)b_seg->data;
1425 b_seg->current_length = mb_seg->data_len;
1426 b0->total_length_not_including_first_buffer +=
1429 b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
1430 b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
1433 mb_seg = mb_seg->next;
1438 * Turn this on if you run into
1439 * "bad monkey" contexts, and you want to know exactly
1440 * which nodes they've visited... See main.c...
1442 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
1444 if (PREDICT_FALSE (n_trace > mb_index))
1445 vec_add1 (xd->d_trace_buffers, bi0);
1447 next_worker_index = first_worker_index;
1450 * Force unknown traffic onto worker 0,
1451 * and into ethernet-input. $$$$ add more hashes.
1453 h0 = (ethernet_header_t *) b0->data;
1455 /* Compute ingress LB hash */
1456 hash_key = eth_get_key(h0);
1457 hash = (u32)clib_xxhash(hash_key);
1459 if (PREDICT_TRUE (is_pow2(num_workers)))
1460 next_worker_index += hash & (num_workers - 1);
1462 next_worker_index += hash % num_workers;
1464 /* if EFD is enabled and not already discarding from dpdk,
1465 * check the worker ring/queue for congestion
1467 if (PREDICT_FALSE(tm->efd.enabled && !efd_discard_burst))
1469 vlib_frame_queue_t *fq;
1471 /* fq will be valid if the ring is congested */
1472 fq = is_vlib_handoff_queue_congested(
1473 next_worker_index, tm->efd.queue_hi_thresh,
1474 congested_handoff_queue_by_worker_index);
1476 if (PREDICT_FALSE(fq != NULL))
1479 if (PREDICT_TRUE(cntr_type =
1480 is_efd_discardable(tm, b0, mb)))
1482 /* discard the packet */
1483 fq->enqueue_efd_discards++;
1484 increment_efd_drop_counter(vm, cntr_type, 1);
1485 rte_pktmbuf_free(mb);
1493 if (next_worker_index != current_worker_index)
1496 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1498 hf = dpdk_get_handoff_queue_elt(
1500 handoff_queue_elt_by_worker_index);
1502 n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
1503 to_next_worker = &hf->buffer_index[hf->n_vectors];
1504 current_worker_index = next_worker_index;
1507 /* enqueue to correct worker thread */
1508 to_next_worker[0] = bi0;
1510 n_left_to_next_worker--;
1512 if (n_left_to_next_worker == 0)
1514 hf->n_vectors = VLIB_FRAME_SIZE;
1515 vlib_put_handoff_queue_elt(hf);
1516 current_worker_index = ~0;
1517 handoff_queue_elt_by_worker_index[next_worker_index] = 0;
1525 if (PREDICT_FALSE (vec_len (xd->d_trace_buffers) > 0))
1527 /* credit the trace to the trace node */
1528 dpdk_rx_trace (dm, node_trace, xd, queue_id, xd->d_trace_buffers,
1529 vec_len (xd->d_trace_buffers));
1530 vlib_set_trace_count (vm, node_trace, n_trace - vec_len (xd->d_trace_buffers));
1533 vlib_increment_combined_counter
1534 (vnet_get_main()->interface_main.combined_sw_if_counters
1535 + VNET_INTERFACE_COUNTER_RX,
1537 xd->vlib_sw_if_index,
1538 mb_index, n_rx_bytes);
1540 dpdk_worker_t * dw = vec_elt_at_index(dm->workers, cpu_index);
1541 dw->aggregate_rx_packets += mb_index;
1545 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1547 /* Ship frames to the worker nodes */
1548 for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
1550 if (handoff_queue_elt_by_worker_index[i])
1552 hf = handoff_queue_elt_by_worker_index[i];
1554 * It works better to let the handoff node
1555 * rate-adapt, always ship the handoff queue element.
1557 if (1 || hf->n_vectors == hf->last_n_vectors)
1559 vlib_put_handoff_queue_elt(hf);
1560 handoff_queue_elt_by_worker_index[i] = 0;
1563 hf->last_n_vectors = hf->n_vectors;
1565 congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *)(~0);
1568 current_worker_index = ~0;
1570 vlib_increment_main_loop_counter (vm);
1575 * This function is used when the main thread performs IO and feeds the
1579 dpdk_io_input (vlib_main_t * vm,
1580 vlib_node_runtime_t * node,
1583 dpdk_main_t * dm = &dpdk_main;
1585 vlib_thread_main_t * tm = vlib_get_thread_main();
1586 uword n_rx_packets = 0;
1587 static vlib_frame_queue_elt_t ** handoff_queue_elt_by_worker_index;
1588 static vlib_frame_queue_t ** congested_handoff_queue_by_worker_index = 0;
1589 vlib_frame_queue_elt_t * hf = 0;
1591 u32 n_left_to_next_worker = 0, * to_next_worker = 0;
1592 u32 next_worker_index = 0;
1593 u32 current_worker_index = ~0;
1594 u32 cpu_index = os_get_cpu_number();
1595 static int num_workers_set;
1596 static u32 num_workers;
1598 vlib_node_runtime_t * node_trace;
1599 static u32 first_worker_index;
1600 u32 buffer_flags_template;
1602 if (PREDICT_FALSE(num_workers_set == 0))
1605 vlib_thread_registration_t * tr;
1606 /* Only the standard vnet worker threads are supported */
1607 p = hash_get_mem (tm->thread_registrations_by_name, "workers");
1608 tr = (vlib_thread_registration_t *) p[0];
1611 num_workers = tr->count;
1612 first_worker_index = tr->first_index;
1614 num_workers_set = 1;
1617 if (PREDICT_FALSE(handoff_queue_elt_by_worker_index == 0))
1619 vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1);
1621 vec_validate_init_empty (congested_handoff_queue_by_worker_index,
1622 first_worker_index + num_workers - 1,
1623 (vlib_frame_queue_t *)(~0));
1626 /* packet tracing is triggered on the dpdk-input node for ease-of-use */
1627 node_trace = vlib_node_get_runtime (vm, dpdk_input_node.index);
1629 buffer_flags_template = dm->buffer_flags_template;
1631 vec_foreach (xd, dm->devices)
1635 uword n_rx_bytes = 0;
1636 u32 n_trace, trace_cnt __attribute__((unused));
1637 vlib_buffer_free_list_t * fl;
1640 u8 efd_discard_burst = 0;
1645 n_buffers = dpdk_rx_burst(dm, xd, queue_id );
1649 /* check if EFD (dpdk) is enabled */
1650 if (PREDICT_FALSE(dm->efd.enabled))
1652 /* reset a few stats */
1653 xd->efd_agent.last_poll_time = 0;
1654 xd->efd_agent.last_burst_sz = 0;
1659 vec_reset_length (xd->d_trace_buffers);
1660 trace_cnt = n_trace = vlib_get_trace_count (vm, node_trace);
1663 * DAW-FIXME: VMXNET3 device stop/start doesn't work,
1664 * therefore fake the stop in the dpdk driver by
1665 * silently dropping all of the incoming pkts instead of
1666 * stopping the driver / hardware.
1668 if (PREDICT_FALSE(xd->admin_up != 1))
1670 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1671 rte_pktmbuf_free (xd->rx_vectors[queue_id][mb_index]);
1675 /* Check for congestion if EFD (Early-Fast-Discard) is enabled
1676 * in any mode (e.g. dpdk, monitor, or drop_all)
1678 if (PREDICT_FALSE(dm->efd.enabled))
1680 /* update EFD counters */
1681 dpdk_efd_update_counters(xd, n_buffers, dm->efd.enabled);
1683 if (PREDICT_FALSE(dm->efd.enabled & DPDK_EFD_DROPALL_ENABLED))
1685 /* discard all received packets */
1686 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1687 rte_pktmbuf_free(xd->rx_vectors[queue_id][mb_index]);
1689 xd->efd_agent.discard_cnt += n_buffers;
1690 increment_efd_drop_counter(vm,
1691 DPDK_ERROR_VLAN_EFD_DROP_PKTS,
1697 if (PREDICT_FALSE(xd->efd_agent.consec_full_frames_cnt >=
1698 dm->efd.consec_full_frames_hi_thresh))
1700 u32 device_queue_sz = rte_eth_rx_queue_count(xd->device_index,
1702 if (device_queue_sz >= dm->efd.queue_hi_thresh)
1704 /* dpdk device queue has reached the critical threshold */
1705 xd->efd_agent.congestion_cnt++;
1707 /* apply EFD to packets from the burst */
1708 efd_discard_burst = 1;
1713 fl = vlib_buffer_get_free_list
1714 (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
1718 while (n_buffers > 0)
1723 vlib_buffer_t * b0, * b_seg, * b_chain = 0;
1724 ethernet_header_t * h0;
1726 struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index];
1727 struct rte_mbuf *mb_seg = mb->next;
1729 if (PREDICT_TRUE(n_buffers > 1))
1731 struct rte_mbuf *pfmb = xd->rx_vectors[queue_id][mb_index+2];
1732 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1733 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1734 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1735 CLIB_PREFETCH (bp->data, CLIB_CACHE_LINE_BYTES, LOAD);
1738 b0 = vlib_buffer_from_rte_mbuf(mb);
1740 /* check whether EFD is looking for packets to discard */
1741 if (PREDICT_FALSE(efd_discard_burst))
1744 if (PREDICT_TRUE(cntr_type = is_efd_discardable(tm, b0, mb)))
1746 rte_pktmbuf_free(mb);
1747 xd->efd_agent.discard_cnt++;
1748 increment_efd_drop_counter(vm,
1758 /* Prefetch one next segment if it exists */
1759 if (PREDICT_FALSE(mb->nb_segs > 1))
1761 struct rte_mbuf *pfmb = mb->next;
1762 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1763 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1764 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1768 bi0 = vlib_get_buffer_index (vm, b0);
1769 vlib_buffer_init_for_free_list (b0, fl);
1770 b0->clone_count = 0;
1772 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
1774 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
1776 * Clear overloaded TX offload flags when a DPDK driver
1777 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
1779 if (PREDICT_TRUE(trace_cnt == 0))
1780 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
1783 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
1786 clib_warning ("bi %d error %d", bi0, error0);
1790 l3_offset0 = ((next0 == DPDK_RX_NEXT_IP4_INPUT ||
1791 next0 == DPDK_RX_NEXT_IP6_INPUT ||
1792 next0 == DPDK_RX_NEXT_MPLS_INPUT) ?
1793 sizeof (ethernet_header_t) : 0);
1795 b0->current_data = l3_offset0;
1796 b0->current_length = mb->data_len - l3_offset0;
1798 b0->flags = buffer_flags_template;
1800 if (VMWARE_LENGTH_BUG_WORKAROUND)
1801 b0->current_length -= 4;
1803 vnet_buffer(b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
1804 vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
1805 vnet_buffer(b0)->io_handoff.next_index = next0;
1806 n_rx_bytes += mb->pkt_len;
1808 /* Process subsequent segments of multi-segment packets */
1809 while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
1811 ASSERT(mb_seg != 0);
1813 b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
1814 vlib_buffer_init_for_free_list (b_seg, fl);
1815 b_seg->clone_count = 0;
1817 ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1818 ASSERT(b_seg->current_data == 0);
1821 * The driver (e.g. virtio) may not put the packet data at the start
1822 * of the segment, so don't assume b_seg->current_data == 0 is correct.
1824 b_seg->current_data = (mb_seg->buf_addr + mb_seg->data_off) - (void *)b_seg->data;
1826 b_seg->current_length = mb_seg->data_len;
1827 b0->total_length_not_including_first_buffer +=
1830 b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
1831 b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
1834 mb_seg = mb_seg->next;
1839 * Turn this on if you run into
1840 * "bad monkey" contexts, and you want to know exactly
1841 * which nodes they've visited... See main.c...
1843 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
1845 if (PREDICT_FALSE (n_trace > mb_index))
1846 vec_add1 (xd->d_trace_buffers, bi0);
1848 next_worker_index = first_worker_index;
1851 * Force unknown traffic onto worker 0,
1852 * and into ethernet-input. $$$$ add more hashes.
1854 h0 = (ethernet_header_t *) b0->data;
1856 /* Compute ingress LB hash */
1857 hash_key = eth_get_key(h0);
1858 hash = (u32)clib_xxhash(hash_key);
1860 if (PREDICT_TRUE (is_pow2(num_workers)))
1861 next_worker_index += hash & (num_workers - 1);
1863 next_worker_index += hash % num_workers;
1865 /* if EFD is enabled and not already discarding from dpdk,
1866 * check the worker ring/queue for congestion
1868 if (PREDICT_FALSE(tm->efd.enabled && !efd_discard_burst))
1870 vlib_frame_queue_t *fq;
1872 /* fq will be valid if the ring is congested */
1873 fq = is_vlib_handoff_queue_congested(
1874 next_worker_index, tm->efd.queue_hi_thresh,
1875 congested_handoff_queue_by_worker_index);
1877 if (PREDICT_FALSE(fq != NULL))
1880 if (PREDICT_TRUE(cntr_type =
1881 is_efd_discardable(tm, b0, mb)))
1883 /* discard the packet */
1884 fq->enqueue_efd_discards++;
1885 increment_efd_drop_counter(vm, cntr_type, 1);
1886 rte_pktmbuf_free(mb);
1894 if (next_worker_index != current_worker_index)
1897 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1899 hf = dpdk_get_handoff_queue_elt(
1901 handoff_queue_elt_by_worker_index);
1903 n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
1904 to_next_worker = &hf->buffer_index[hf->n_vectors];
1905 current_worker_index = next_worker_index;
1908 /* enqueue to correct worker thread */
1909 to_next_worker[0] = bi0;
1911 n_left_to_next_worker--;
1913 if (n_left_to_next_worker == 0)
1915 hf->n_vectors = VLIB_FRAME_SIZE;
1916 vlib_put_handoff_queue_elt(hf);
1917 current_worker_index = ~0;
1918 handoff_queue_elt_by_worker_index[next_worker_index] = 0;
1926 if (PREDICT_FALSE (vec_len (xd->d_trace_buffers) > 0))
1928 /* credit the trace to the trace node */
1929 dpdk_rx_trace (dm, node_trace, xd, queue_id, xd->d_trace_buffers,
1930 vec_len (xd->d_trace_buffers));
1931 vlib_set_trace_count (vm, node_trace, n_trace - vec_len (xd->d_trace_buffers));
1934 vlib_increment_combined_counter
1935 (vnet_get_main()->interface_main.combined_sw_if_counters
1936 + VNET_INTERFACE_COUNTER_RX,
1938 xd->vlib_sw_if_index,
1939 mb_index, n_rx_bytes);
1941 dpdk_worker_t * dw = vec_elt_at_index(dm->workers, cpu_index);
1942 dw->aggregate_rx_packets += mb_index;
1943 n_rx_packets += mb_index;
1947 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1949 /* Ship frames to the worker nodes */
1950 for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
1952 if (handoff_queue_elt_by_worker_index[i])
1954 hf = handoff_queue_elt_by_worker_index[i];
1956 * It works better to let the handoff node
1957 * rate-adapt, always ship the handoff queue element.
1959 if (1 || hf->n_vectors == hf->last_n_vectors)
1961 vlib_put_handoff_queue_elt(hf);
1962 handoff_queue_elt_by_worker_index[i] = 0;
1965 hf->last_n_vectors = hf->n_vectors;
1967 congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *)(~0);
1970 current_worker_index = ~0;
1971 return n_rx_packets;
1974 VLIB_REGISTER_NODE (dpdk_io_input_node) = {
1975 .function = dpdk_io_input,
1976 .type = VLIB_NODE_TYPE_INPUT,
1977 .name = "dpdk-io-input",
1979 /* Will be enabled if/when hardware is detected. */
1980 .state = VLIB_NODE_STATE_DISABLED,
1982 .format_buffer = format_ethernet_header_with_length,
1983 .format_trace = format_dpdk_rx_dma_trace,
1985 .n_errors = DPDK_N_ERROR,
1986 .error_strings = dpdk_error_strings,
1988 .n_next_nodes = DPDK_RX_N_NEXT,
1990 [DPDK_RX_NEXT_DROP] = "error-drop",
1991 [DPDK_RX_NEXT_ETHERNET_INPUT] = "ethernet-input",
1992 [DPDK_RX_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
1993 [DPDK_RX_NEXT_IP6_INPUT] = "ip6-input",
1994 [DPDK_RX_NEXT_MPLS_INPUT] = "mpls-gre-input",
2000 * Based on the operation type, set lower/upper bits for the given index value
2003 set_efd_bitmap (u8 *bitmap, u32 value, u32 op)
2008 for (ix = 0; ix < 8; ix++) {
2009 if (((op == EFD_OPERATION_LESS_THAN) && (ix < value)) ||
2010 ((op == EFD_OPERATION_GREATER_OR_EQUAL) && (ix >= value))){
2011 (*bitmap) |= (1 << ix);
2017 efd_config (u32 enabled,
2018 u32 ip_prec, u32 ip_op,
2019 u32 mpls_exp, u32 mpls_op,
2020 u32 vlan_cos, u32 vlan_op)
2022 vlib_thread_main_t * tm = vlib_get_thread_main();
2023 dpdk_main_t * dm = &dpdk_main;
2026 tm->efd.enabled |= VLIB_EFD_DISCARD_ENABLED;
2027 dm->efd.enabled |= DPDK_EFD_DISCARD_ENABLED;
2029 tm->efd.enabled &= ~VLIB_EFD_DISCARD_ENABLED;
2030 dm->efd.enabled &= ~DPDK_EFD_DISCARD_ENABLED;
2033 set_efd_bitmap(&tm->efd.ip_prec_bitmap, ip_prec, ip_op);
2034 set_efd_bitmap(&tm->efd.mpls_exp_bitmap, mpls_exp, mpls_op);
2035 set_efd_bitmap(&tm->efd.vlan_cos_bitmap, vlan_cos, vlan_op);