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 clib_error_t *handoff_dispatch_init (vlib_main_t *vm)
256 handoff_dispatch_main_t * mp = &handoff_dispatch_main;
259 mp->vnet_main = &vnet_main;
264 VLIB_INIT_FUNCTION (handoff_dispatch_init);
266 u32 dpdk_get_handoff_node_index (void)
268 return handoff_dispatch_node.index;
271 static char * dpdk_error_strings[] = {
278 dpdk_rx_next_and_error_from_mb_flags_x1 (dpdk_device_t *xd, struct rte_mbuf *mb,
280 u8 * next0, u8 * error0)
282 u8 is0_ip4, is0_ip6, is0_mpls, n0;
283 uint16_t mb_flags = mb->ol_flags;
285 if (PREDICT_FALSE(mb_flags & (
286 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
287 PKT_EXT_RX_PKT_ERROR | PKT_EXT_RX_BAD_FCS |
288 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
289 PKT_RX_IP_CKSUM_BAD | PKT_RX_L4_CKSUM_BAD
292 /* some error was flagged. determine the drop reason */
293 n0 = DPDK_RX_NEXT_DROP;
295 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
296 (mb_flags & PKT_EXT_RX_PKT_ERROR) ? DPDK_ERROR_RX_PACKET_ERROR :
297 (mb_flags & PKT_EXT_RX_BAD_FCS) ? DPDK_ERROR_RX_BAD_FCS :
298 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
299 (mb_flags & PKT_RX_IP_CKSUM_BAD) ? DPDK_ERROR_IP_CHECKSUM_ERROR :
300 (mb_flags & PKT_RX_L4_CKSUM_BAD) ? DPDK_ERROR_L4_CHECKSUM_ERROR :
305 *error0 = DPDK_ERROR_NONE;
306 if (xd->per_interface_next_index != ~0)
307 n0 = xd->per_interface_next_index;
308 else if (mb_flags & PKT_RX_VLAN_PKT)
309 n0 = DPDK_RX_NEXT_ETHERNET_INPUT;
312 n0 = DPDK_RX_NEXT_ETHERNET_INPUT;
313 #if RTE_VERSION >= RTE_VERSION_NUM(2, 1, 0, 0)
314 is0_ip4 = RTE_ETH_IS_IPV4_HDR(mb->packet_type) != 0;
316 is0_ip4 = (mb_flags & (PKT_RX_IPV4_HDR | PKT_RX_IPV4_HDR_EXT)) != 0;
319 if (PREDICT_TRUE(is0_ip4))
320 n0 = DPDK_RX_NEXT_IP4_INPUT;
323 #if RTE_VERSION >= RTE_VERSION_NUM(2, 1, 0, 0)
324 is0_ip6 = RTE_ETH_IS_IPV6_HDR(mb->packet_type) != 0;
327 (mb_flags & (PKT_RX_IPV6_HDR | PKT_RX_IPV6_HDR_EXT)) != 0;
329 if (PREDICT_TRUE(is0_ip6))
330 n0 = DPDK_RX_NEXT_IP6_INPUT;
333 ethernet_header_t *h0 = (ethernet_header_t *) b0->data;
334 is0_mpls = (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_MPLS_UNICAST));
335 n0 = is0_mpls ? DPDK_RX_NEXT_MPLS_INPUT : n0;
343 void dpdk_rx_trace (dpdk_main_t * dm,
344 vlib_node_runtime_t * node,
350 vlib_main_t * vm = vlib_get_main();
361 dpdk_rx_dma_trace_t * t0;
368 b0 = vlib_get_buffer (vm, bi0);
369 mb = rte_mbuf_from_vlib_buffer(b0);
370 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
372 vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0);
373 t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
374 t0->queue_index = queue_id;
375 t0->device_index = xd->device_index;
376 t0->buffer_index = bi0;
378 memcpy (&t0->mb, mb, sizeof (t0->mb));
379 memcpy (&t0->buffer, b0, sizeof (b0[0]) - sizeof (b0->pre_data));
380 memcpy (t0->buffer.pre_data, b0->data, sizeof (t0->buffer.pre_data));
382 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
384 * Clear overloaded TX offload flags when a DPDK driver
385 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
387 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
388 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
395 * dpdk_efd_update_counters()
396 * Update EFD (early-fast-discard) counters
398 void dpdk_efd_update_counters (dpdk_device_t *xd,
402 if (enabled & DPDK_EFD_MONITOR_ENABLED)
404 u64 now = clib_cpu_time_now();
405 if (xd->efd_agent.last_poll_time > 0)
407 u64 elapsed_time = (now - xd->efd_agent.last_poll_time);
408 if (elapsed_time > xd->efd_agent.max_poll_delay)
409 xd->efd_agent.max_poll_delay = elapsed_time;
411 xd->efd_agent.last_poll_time = now;
414 xd->efd_agent.total_packet_cnt += n_buffers;
415 xd->efd_agent.last_burst_sz = n_buffers;
417 if (n_buffers > xd->efd_agent.max_burst_sz)
418 xd->efd_agent.max_burst_sz = n_buffers;
420 if (PREDICT_FALSE(n_buffers == VLIB_FRAME_SIZE))
422 xd->efd_agent.full_frames_cnt++;
423 xd->efd_agent.consec_full_frames_cnt++;
427 xd->efd_agent.consec_full_frames_cnt = 0;
431 /* is_efd_discardable()
432 * returns non zero DPDK error if packet meets early-fast-discard criteria,
435 u32 is_efd_discardable (vlib_thread_main_t *tm,
439 ethernet_header_t *eh = (ethernet_header_t *) b0->data;
441 if (eh->type == clib_host_to_net_u16(ETHERNET_TYPE_IP4))
444 (ip4_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
445 u8 pkt_prec = (ipv4->tos >> 5);
447 return (tm->efd.ip_prec_bitmap & (1 << pkt_prec) ?
448 DPDK_ERROR_IPV4_EFD_DROP_PKTS : DPDK_ERROR_NONE);
450 else if (eh->type == clib_net_to_host_u16(ETHERNET_TYPE_IP6))
453 (ip6_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
455 ((ipv6->ip_version_traffic_class_and_flow_label >> 20) & 0xff);
457 return (tm->efd.ip_prec_bitmap & (1 << pkt_tclass) ?
458 DPDK_ERROR_IPV6_EFD_DROP_PKTS : DPDK_ERROR_NONE);
460 else if (eh->type == clib_net_to_host_u16(ETHERNET_TYPE_MPLS_UNICAST))
462 mpls_unicast_header_t *mpls =
463 (mpls_unicast_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
464 u8 pkt_exp = ((mpls->label_exp_s_ttl >> 9) & 0x07);
466 return (tm->efd.mpls_exp_bitmap & (1 << pkt_exp) ?
467 DPDK_ERROR_MPLS_EFD_DROP_PKTS : DPDK_ERROR_NONE);
469 else if ((eh->type == clib_net_to_host_u16(ETHERNET_TYPE_VLAN)) ||
470 (eh->type == clib_net_to_host_u16(ETHERNET_TYPE_DOT1AD)))
472 ethernet_vlan_header_t *vlan =
473 (ethernet_vlan_header_t *)&(b0->data[sizeof(ethernet_header_t)]);
474 u8 pkt_cos = ((vlan->priority_cfi_and_id >> 13) & 0x07);
476 return (tm->efd.vlan_cos_bitmap & (1 << pkt_cos) ?
477 DPDK_ERROR_VLAN_EFD_DROP_PKTS : DPDK_ERROR_NONE);
480 return DPDK_ERROR_NONE;
484 * This function is used when there are no worker threads.
485 * The main thread performs IO and forwards the packets.
487 static inline u32 dpdk_device_input ( dpdk_main_t * dm,
489 vlib_node_runtime_t * node,
494 u32 next_index = DPDK_RX_NEXT_ETHERNET_INPUT;
495 u32 n_left_to_next, * to_next;
497 vlib_main_t * vm = vlib_get_main();
498 uword n_rx_bytes = 0;
499 u32 n_trace, trace_cnt __attribute__((unused));
500 vlib_buffer_free_list_t * fl;
501 u8 efd_discard_burst = 0;
502 u16 ip_align_offset = 0;
503 u32 buffer_flags_template;
505 if (xd->admin_up == 0)
508 n_buffers = dpdk_rx_burst(dm, xd, queue_id);
512 /* check if EFD (dpdk) is enabled */
513 if (PREDICT_FALSE(dm->efd.enabled))
515 /* reset a few stats */
516 xd->efd_agent.last_poll_time = 0;
517 xd->efd_agent.last_burst_sz = 0;
522 if (xd->pmd == VNET_DPDK_PMD_THUNDERX)
525 buffer_flags_template = dm->buffer_flags_template;
527 vec_reset_length (xd->d_trace_buffers);
528 trace_cnt = n_trace = vlib_get_trace_count (vm, node);
530 fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
533 * DAW-FIXME: VMXNET3 device stop/start doesn't work,
534 * therefore fake the stop in the dpdk driver by
535 * silently dropping all of the incoming pkts instead of
536 * stopping the driver / hardware.
538 if (PREDICT_FALSE(xd->admin_up != 1))
540 for (mb_index = 0; mb_index < n_buffers; mb_index++)
541 rte_pktmbuf_free (xd->rx_vectors[queue_id][mb_index]);
546 /* Check for congestion if EFD (Early-Fast-Discard) is enabled
547 * in any mode (e.g. dpdk, monitor, or drop_all)
549 if (PREDICT_FALSE(dm->efd.enabled))
551 /* update EFD counters */
552 dpdk_efd_update_counters(xd, n_buffers, dm->efd.enabled);
554 if (PREDICT_FALSE(dm->efd.enabled & DPDK_EFD_DROPALL_ENABLED))
556 /* discard all received packets */
557 for (mb_index = 0; mb_index < n_buffers; mb_index++)
558 rte_pktmbuf_free(xd->rx_vectors[queue_id][mb_index]);
560 xd->efd_agent.discard_cnt += n_buffers;
561 increment_efd_drop_counter(vm,
562 DPDK_ERROR_VLAN_EFD_DROP_PKTS,
568 if (PREDICT_FALSE(xd->efd_agent.consec_full_frames_cnt >=
569 dm->efd.consec_full_frames_hi_thresh))
571 u32 device_queue_sz = rte_eth_rx_queue_count(xd->device_index,
573 if (device_queue_sz >= dm->efd.queue_hi_thresh)
575 /* dpdk device queue has reached the critical threshold */
576 xd->efd_agent.congestion_cnt++;
578 /* apply EFD to packets from the burst */
579 efd_discard_burst = 1;
586 while (n_buffers > 0)
591 vlib_buffer_t * b0, * b_seg, * b_chain = 0;
594 vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
596 while (n_buffers > 0 && n_left_to_next > 0)
599 struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index];
600 struct rte_mbuf *mb_seg = mb->next;
602 if (PREDICT_TRUE(n_buffers > 2))
604 struct rte_mbuf *pfmb = xd->rx_vectors[queue_id][mb_index+2];
605 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
606 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, STORE);
607 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
612 b0 = vlib_buffer_from_rte_mbuf(mb);
614 /* check whether EFD is looking for packets to discard */
615 if (PREDICT_FALSE(efd_discard_burst))
617 vlib_thread_main_t * tm = vlib_get_thread_main();
619 if (PREDICT_TRUE(cntr_type = is_efd_discardable(tm, b0, mb)))
621 rte_pktmbuf_free(mb);
622 xd->efd_agent.discard_cnt++;
623 increment_efd_drop_counter(vm,
632 /* Prefetch one next segment if it exists. */
633 if (PREDICT_FALSE(mb->nb_segs > 1))
635 struct rte_mbuf *pfmb = mb->next;
636 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
637 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
638 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
642 vlib_buffer_init_for_free_list (b0, fl);
645 bi0 = vlib_get_buffer_index (vm, b0);
651 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
653 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
655 * Clear overloaded TX offload flags when a DPDK driver
656 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
659 if (PREDICT_TRUE(trace_cnt == 0))
660 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
663 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
665 b0->error = node->errors[error0];
667 l3_offset0 = ((next0 == DPDK_RX_NEXT_IP4_INPUT ||
668 next0 == DPDK_RX_NEXT_IP6_INPUT ||
669 next0 == DPDK_RX_NEXT_MPLS_INPUT) ?
670 sizeof (ethernet_header_t) : 0);
672 b0->current_data = l3_offset0;
673 b0->current_length = mb->data_len - l3_offset0;
675 if (PREDICT_FALSE (ip_align_offset != 0))
677 if (next0 == DPDK_RX_NEXT_IP4_INPUT ||
678 next0 == DPDK_RX_NEXT_IP6_INPUT)
679 b0->current_data += ip_align_offset;
682 b0->flags = buffer_flags_template;
684 if (VMWARE_LENGTH_BUG_WORKAROUND)
685 b0->current_length -= 4;
687 vnet_buffer(b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
688 vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
689 n_rx_bytes += mb->pkt_len;
691 /* Process subsequent segments of multi-segment packets */
692 while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
696 b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
697 vlib_buffer_init_for_free_list (b_seg, fl);
698 b_seg->clone_count = 0;
700 ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
701 ASSERT(b_seg->current_data == 0);
704 * The driver (e.g. virtio) may not put the packet data at the start
705 * of the segment, so don't assume b_seg->current_data == 0 is correct.
707 b_seg->current_data = (mb_seg->buf_addr + mb_seg->data_off) - (void *)b_seg->data;
709 b_seg->current_length = mb_seg->data_len;
710 b0->total_length_not_including_first_buffer +=
713 b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
714 b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
717 mb_seg = mb_seg->next;
722 * Turn this on if you run into
723 * "bad monkey" contexts, and you want to know exactly
724 * which nodes they've visited... See main.c...
726 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
728 vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
729 to_next, n_left_to_next,
731 if (PREDICT_FALSE (n_trace > mb_index))
732 vec_add1 (xd->d_trace_buffers, bi0);
736 vlib_put_next_frame (vm, node, next_index, n_left_to_next);
739 if (PREDICT_FALSE (vec_len (xd->d_trace_buffers) > 0))
741 dpdk_rx_trace (dm, node, xd, queue_id, xd->d_trace_buffers,
742 vec_len (xd->d_trace_buffers));
743 vlib_set_trace_count (vm, node, n_trace - vec_len (xd->d_trace_buffers));
746 vlib_increment_combined_counter
747 (vnet_get_main()->interface_main.combined_sw_if_counters
748 + VNET_INTERFACE_COUNTER_RX,
750 xd->vlib_sw_if_index,
751 mb_index, n_rx_bytes);
753 dpdk_worker_t * dw = vec_elt_at_index(dm->workers, cpu_index);
754 dw->aggregate_rx_packets += mb_index;
760 #define VIRL_SPEED_LIMIT() \
761 /* Limit the input rate to 1000 vectors / sec */ \
763 struct timespec ts, tsrem; \
766 ts.tv_nsec = 1000*1000; /* 1ms */ \
768 while (nanosleep(&ts, &tsrem) < 0) \
774 #define VIRL_SPEED_LIMIT()
779 dpdk_input (vlib_main_t * vm,
780 vlib_node_runtime_t * node,
783 dpdk_main_t * dm = &dpdk_main;
785 uword n_rx_packets = 0;
786 dpdk_device_and_queue_t * dq;
787 u32 cpu_index = os_get_cpu_number();
790 * Poll all devices on this cpu for input/interrupts.
792 vec_foreach (dq, dm->devices_by_cpu[cpu_index])
794 xd = vec_elt_at_index(dm->devices, dq->device);
795 ASSERT(dq->queue_id == 0);
796 n_rx_packets += dpdk_device_input (dm, xd, node, cpu_index, 0);
805 dpdk_input_rss (vlib_main_t * vm,
806 vlib_node_runtime_t * node,
809 dpdk_main_t * dm = &dpdk_main;
811 uword n_rx_packets = 0;
812 dpdk_device_and_queue_t * dq;
813 u32 cpu_index = os_get_cpu_number();
816 * Poll all devices on this cpu for input/interrupts.
818 vec_foreach (dq, dm->devices_by_cpu[cpu_index])
820 xd = vec_elt_at_index(dm->devices, dq->device);
821 n_rx_packets += dpdk_device_input (dm, xd, node, cpu_index, dq->queue_id);
829 VLIB_REGISTER_NODE (dpdk_input_node) = {
830 .function = dpdk_input,
831 .type = VLIB_NODE_TYPE_INPUT,
832 .name = "dpdk-input",
834 /* Will be enabled if/when hardware is detected. */
835 .state = VLIB_NODE_STATE_DISABLED,
837 .format_buffer = format_ethernet_header_with_length,
838 .format_trace = format_dpdk_rx_dma_trace,
840 .n_errors = DPDK_N_ERROR,
841 .error_strings = dpdk_error_strings,
843 .n_next_nodes = DPDK_RX_N_NEXT,
845 [DPDK_RX_NEXT_DROP] = "error-drop",
846 [DPDK_RX_NEXT_ETHERNET_INPUT] = "ethernet-input",
847 [DPDK_RX_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
848 [DPDK_RX_NEXT_IP6_INPUT] = "ip6-input",
849 [DPDK_RX_NEXT_MPLS_INPUT] = "mpls-gre-input",
854 * Override the next nodes for the dpdk input nodes.
855 * Must be invoked prior to VLIB_INIT_FUNCTION calls.
857 void dpdk_set_next_node (dpdk_rx_next_t next, char *name)
859 vlib_node_registration_t *r = &dpdk_input_node;
860 vlib_node_registration_t *r_io = &dpdk_io_input_node;
861 vlib_node_registration_t *r_handoff = &handoff_dispatch_node;
865 case DPDK_RX_NEXT_IP4_INPUT:
866 case DPDK_RX_NEXT_IP6_INPUT:
867 case DPDK_RX_NEXT_MPLS_INPUT:
868 case DPDK_RX_NEXT_ETHERNET_INPUT:
869 r->next_nodes[next] = name;
870 r_io->next_nodes[next] = name;
871 r_handoff->next_nodes[next] = name;
875 clib_warning ("%s: illegal next %d\n", __FUNCTION__, next);
880 inline vlib_frame_queue_elt_t *
881 vlib_get_handoff_queue_elt (u32 vlib_worker_index)
883 vlib_frame_queue_t *fq;
884 vlib_frame_queue_elt_t *elt;
887 fq = vlib_frame_queues[vlib_worker_index];
890 new_tail = __sync_add_and_fetch (&fq->tail, 1);
892 /* Wait until a ring slot is available */
893 while (new_tail >= fq->head_hint + fq->nelts)
894 vlib_worker_thread_barrier_check ();
896 elt = fq->elts + (new_tail & (fq->nelts-1));
898 /* this would be very bad... */
902 elt->msg_type = VLIB_FRAME_QUEUE_ELT_DISPATCH_FRAME;
903 elt->last_n_vectors = elt->n_vectors = 0;
908 static inline vlib_frame_queue_elt_t *
909 dpdk_get_handoff_queue_elt (
910 u32 vlib_worker_index,
911 vlib_frame_queue_elt_t ** handoff_queue_elt_by_worker_index)
913 vlib_frame_queue_elt_t *elt;
915 if (handoff_queue_elt_by_worker_index [vlib_worker_index])
916 return handoff_queue_elt_by_worker_index [vlib_worker_index];
918 elt = vlib_get_handoff_queue_elt (vlib_worker_index);
920 handoff_queue_elt_by_worker_index [vlib_worker_index] = elt;
925 static inline vlib_frame_queue_t *
926 is_vlib_handoff_queue_congested (
927 u32 vlib_worker_index,
929 vlib_frame_queue_t ** handoff_queue_by_worker_index)
931 vlib_frame_queue_t *fq;
933 fq = handoff_queue_by_worker_index [vlib_worker_index];
934 if (fq != (vlib_frame_queue_t *)(~0))
937 fq = vlib_frame_queues[vlib_worker_index];
940 if (PREDICT_FALSE(fq->tail >= (fq->head_hint + queue_hi_thresh))) {
941 /* a valid entry in the array will indicate the queue has reached
942 * the specified threshold and is congested
944 handoff_queue_by_worker_index [vlib_worker_index] = fq;
945 fq->enqueue_full_events++;
952 static inline u64 ipv4_get_key (ip4_header_t *ip)
956 hash_key = *((u64*)(&ip->address_pair)) ^ ip->protocol;
961 static inline u64 ipv6_get_key (ip6_header_t *ip)
965 hash_key = ip->src_address.as_u64[0] ^
966 rotate_left(ip->src_address.as_u64[1],13) ^
967 rotate_left(ip->dst_address.as_u64[0],26) ^
968 rotate_left(ip->dst_address.as_u64[1],39) ^
975 #define MPLS_BOTTOM_OF_STACK_BIT_MASK 0x00000100U
976 #define MPLS_LABEL_MASK 0xFFFFF000U
978 static inline u64 mpls_get_key (mpls_unicast_header_t *m)
984 /* find the bottom of the MPLS label stack. */
985 if (PREDICT_TRUE(m->label_exp_s_ttl &
986 clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK))) {
987 goto bottom_lbl_found;
991 if (PREDICT_TRUE(m->label_exp_s_ttl &
992 clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK))) {
993 goto bottom_lbl_found;
997 if (m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK)) {
998 goto bottom_lbl_found;
1002 if (m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK)) {
1003 goto bottom_lbl_found;
1007 if (m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_BOTTOM_OF_STACK_BIT_MASK)) {
1008 goto bottom_lbl_found;
1011 /* the bottom label was not found - use the last label */
1012 hash_key = m->label_exp_s_ttl & clib_net_to_host_u32(MPLS_LABEL_MASK);
1019 ip_ver = (*((u8 *)m) >> 4);
1021 /* find out if it is IPV4 or IPV6 header */
1022 if (PREDICT_TRUE(ip_ver == 4)) {
1023 hash_key = ipv4_get_key((ip4_header_t *)m);
1024 } else if (PREDICT_TRUE(ip_ver == 6)) {
1025 hash_key = ipv6_get_key((ip6_header_t *)m);
1027 /* use the bottom label */
1028 hash_key = (m-1)->label_exp_s_ttl & clib_net_to_host_u32(MPLS_LABEL_MASK);
1035 static inline u64 eth_get_key (ethernet_header_t *h0)
1040 if (PREDICT_TRUE(h0->type) == clib_host_to_net_u16(ETHERNET_TYPE_IP4)) {
1041 hash_key = ipv4_get_key((ip4_header_t *)(h0+1));
1042 } else if (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_IP6)) {
1043 hash_key = ipv6_get_key((ip6_header_t *)(h0+1));
1044 } else if (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_MPLS_UNICAST)) {
1045 hash_key = mpls_get_key((mpls_unicast_header_t *)(h0+1));
1046 } else if ((h0->type == clib_host_to_net_u16(ETHERNET_TYPE_VLAN)) ||
1047 (h0->type == clib_host_to_net_u16(ETHERNET_TYPE_DOT1AD))) {
1048 ethernet_vlan_header_t * outer = (ethernet_vlan_header_t *)(h0 + 1);
1050 outer = (outer->type == clib_host_to_net_u16(ETHERNET_TYPE_VLAN)) ?
1052 if (PREDICT_TRUE(outer->type) == clib_host_to_net_u16(ETHERNET_TYPE_IP4)) {
1053 hash_key = ipv4_get_key((ip4_header_t *)(outer+1));
1054 } else if (outer->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6)) {
1055 hash_key = ipv6_get_key((ip6_header_t *)(outer+1));
1056 } else if (outer->type == clib_host_to_net_u16(ETHERNET_TYPE_MPLS_UNICAST)) {
1057 hash_key = mpls_get_key((mpls_unicast_header_t *)(outer+1));
1059 hash_key = outer->type;
1069 * This function is used when dedicated IO threads feed the worker threads.
1071 * Devices are allocated to this thread based on instances and instance_id.
1072 * If instances==0 then the function automatically determines the number
1073 * of instances of this thread, and allocates devices between them.
1074 * If instances != 0, then instance_id must be in the range 0..instances-1.
1075 * The function allocates devices among the specified number of instances,
1076 * with this thread having the given instance id. This option is used for
1077 * splitting devices among differently named "io"-type threads.
1079 void dpdk_io_thread (vlib_worker_thread_t * w,
1083 dpdk_io_thread_callback_t callback)
1085 vlib_main_t * vm = vlib_get_main();
1086 vlib_thread_main_t * tm = vlib_get_thread_main();
1087 vlib_thread_registration_t * tr;
1088 dpdk_main_t * dm = &dpdk_main;
1089 char *io_name = w->registration->name;
1091 dpdk_device_t ** my_devices = 0;
1092 vlib_frame_queue_elt_t ** handoff_queue_elt_by_worker_index = 0;
1093 vlib_frame_queue_t ** congested_handoff_queue_by_worker_index = 0;
1094 vlib_frame_queue_elt_t * hf = 0;
1096 u32 n_left_to_next_worker = 0, * to_next_worker = 0;
1097 u32 next_worker_index = 0;
1098 u32 current_worker_index = ~0;
1099 u32 cpu_index = os_get_cpu_number();
1100 u32 num_workers = 0;
1101 u32 num_devices = 0;
1104 vlib_node_runtime_t * node_trace;
1105 u32 first_worker_index = 0;
1106 u32 buffer_flags_template;
1108 /* Wait until the dpdk init sequence is complete */
1109 while (dm->io_thread_release == 0)
1110 vlib_worker_thread_barrier_check();
1112 clib_time_init (&vm->clib_time);
1114 p = hash_get_mem (tm->thread_registrations_by_name, worker_name);
1116 tr = (vlib_thread_registration_t *) p[0];
1119 num_workers = tr->count;
1120 first_worker_index = tr->first_index;
1123 /* Allocate devices to this thread */
1127 instance_id = w->instance_id;
1129 p = hash_get_mem (tm->thread_registrations_by_name, io_name);
1130 tr = (vlib_thread_registration_t *) p[0];
1131 /* Otherwise, how did we get here */
1132 ASSERT (tr && tr->count);
1133 instances = tr->count;
1137 /* manually assign */
1138 ASSERT (instance_id < instances);
1141 vec_validate (handoff_queue_elt_by_worker_index,
1142 first_worker_index + num_workers - 1);
1144 vec_validate_init_empty (congested_handoff_queue_by_worker_index,
1145 first_worker_index + num_workers - 1,
1146 (vlib_frame_queue_t *)(~0));
1148 /* packet tracing is triggered on the dpdk-input node for ease-of-use */
1149 node_trace = vlib_node_get_runtime (vm, dpdk_input_node.index);
1151 buffer_flags_template = dm->buffer_flags_template;
1153 /* And handle them... */
1158 uword n_rx_bytes = 0;
1159 u32 n_trace, trace_cnt __attribute__((unused));
1160 vlib_buffer_free_list_t * fl;
1163 u8 efd_discard_burst;
1165 vlib_worker_thread_barrier_check ();
1167 /* Invoke callback if supplied */
1168 if (PREDICT_FALSE(callback != NULL))
1171 if (PREDICT_FALSE(vec_len(dm->devices) != num_devices))
1173 vec_reset_length(my_devices);
1174 vec_foreach (xd, dm->devices)
1176 if (((xd - dm->devices) % tr->count) == instance_id)
1178 fprintf(stderr, "i/o thread %d (cpu %d) takes port %d\n",
1179 instance_id, (int) os_get_cpu_number(), (int) (xd - dm->devices));
1180 vec_add1 (my_devices, xd);
1183 num_devices = vec_len(dm->devices);
1186 for (i = 0; i < vec_len (my_devices); i++)
1193 n_buffers = dpdk_rx_burst(dm, xd, 0 /* queue_id */);
1197 /* check if EFD (dpdk) is enabled */
1198 if (PREDICT_FALSE(dm->efd.enabled))
1200 /* reset a few stats */
1201 xd->efd_agent.last_poll_time = 0;
1202 xd->efd_agent.last_burst_sz = 0;
1207 vec_reset_length (xd->d_trace_buffers);
1208 trace_cnt = n_trace = vlib_get_trace_count (vm, node_trace);
1211 * DAW-FIXME: VMXNET3 device stop/start doesn't work,
1212 * therefore fake the stop in the dpdk driver by
1213 * silently dropping all of the incoming pkts instead of
1214 * stopping the driver / hardware.
1216 if (PREDICT_FALSE(xd->admin_up != 1))
1218 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1219 rte_pktmbuf_free (xd->rx_vectors[queue_id][mb_index]);
1223 /* reset EFD action for the burst */
1224 efd_discard_burst = 0;
1226 /* Check for congestion if EFD (Early-Fast-Discard) is enabled
1227 * in any mode (e.g. dpdk, monitor, or drop_all)
1229 if (PREDICT_FALSE(dm->efd.enabled))
1231 /* update EFD counters */
1232 dpdk_efd_update_counters(xd, n_buffers, dm->efd.enabled);
1234 if (PREDICT_FALSE(dm->efd.enabled & DPDK_EFD_DROPALL_ENABLED))
1236 /* drop all received packets */
1237 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1238 rte_pktmbuf_free(xd->rx_vectors[queue_id][mb_index]);
1240 xd->efd_agent.discard_cnt += n_buffers;
1241 increment_efd_drop_counter(vm,
1242 DPDK_ERROR_VLAN_EFD_DROP_PKTS,
1248 if (PREDICT_FALSE(xd->efd_agent.consec_full_frames_cnt >=
1249 dm->efd.consec_full_frames_hi_thresh))
1251 u32 device_queue_sz = rte_eth_rx_queue_count(xd->device_index,
1253 if (device_queue_sz >= dm->efd.queue_hi_thresh)
1255 /* dpdk device queue has reached the critical threshold */
1256 xd->efd_agent.congestion_cnt++;
1258 /* apply EFD to packets from the burst */
1259 efd_discard_burst = 1;
1264 fl = vlib_buffer_get_free_list
1265 (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
1269 while (n_buffers > 0)
1274 vlib_buffer_t * b0, * b_seg, * b_chain = 0;
1275 ethernet_header_t * h0;
1277 struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index];
1278 struct rte_mbuf *mb_seg = mb->next;
1280 if (PREDICT_TRUE(n_buffers > 1))
1282 struct rte_mbuf *pfmb = xd->rx_vectors[queue_id][mb_index+2];
1283 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1284 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1285 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1286 CLIB_PREFETCH (bp->data, CLIB_CACHE_LINE_BYTES, LOAD);
1289 b0 = vlib_buffer_from_rte_mbuf(mb);
1291 /* check whether EFD is looking for packets to discard */
1292 if (PREDICT_FALSE(efd_discard_burst))
1295 if (PREDICT_TRUE(cntr_type = is_efd_discardable(tm, b0, mb)))
1297 rte_pktmbuf_free(mb);
1298 xd->efd_agent.discard_cnt++;
1299 increment_efd_drop_counter(vm,
1309 /* Prefetch one next segment if it exists */
1310 if (PREDICT_FALSE(mb->nb_segs > 1))
1312 struct rte_mbuf *pfmb = mb->next;
1313 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1314 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1315 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1319 bi0 = vlib_get_buffer_index (vm, b0);
1320 vlib_buffer_init_for_free_list (b0, fl);
1321 b0->clone_count = 0;
1323 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
1325 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
1327 * Clear overloaded TX offload flags when a DPDK driver
1328 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
1330 if (PREDICT_TRUE(trace_cnt == 0))
1331 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
1334 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
1337 clib_warning ("bi %d error %d", bi0, error0);
1341 l3_offset0 = ((next0 == DPDK_RX_NEXT_IP4_INPUT ||
1342 next0 == DPDK_RX_NEXT_IP6_INPUT ||
1343 next0 == DPDK_RX_NEXT_MPLS_INPUT) ?
1344 sizeof (ethernet_header_t) : 0);
1346 b0->current_data = l3_offset0;
1347 b0->current_length = mb->data_len - l3_offset0;
1349 b0->flags = buffer_flags_template;
1351 if (VMWARE_LENGTH_BUG_WORKAROUND)
1352 b0->current_length -= 4;
1354 vnet_buffer(b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
1355 vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
1356 vnet_buffer(b0)->io_handoff.next_index = next0;
1357 n_rx_bytes += mb->pkt_len;
1359 /* Process subsequent segments of multi-segment packets */
1360 while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
1362 ASSERT(mb_seg != 0);
1364 b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
1365 vlib_buffer_init_for_free_list (b_seg, fl);
1366 b_seg->clone_count = 0;
1368 ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1369 ASSERT(b_seg->current_data == 0);
1372 * The driver (e.g. virtio) may not put the packet data at the start
1373 * of the segment, so don't assume b_seg->current_data == 0 is correct.
1375 b_seg->current_data = (mb_seg->buf_addr + mb_seg->data_off) - (void *)b_seg->data;
1377 b_seg->current_length = mb_seg->data_len;
1378 b0->total_length_not_including_first_buffer +=
1381 b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
1382 b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
1385 mb_seg = mb_seg->next;
1390 * Turn this on if you run into
1391 * "bad monkey" contexts, and you want to know exactly
1392 * which nodes they've visited... See main.c...
1394 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
1396 if (PREDICT_FALSE (n_trace > mb_index))
1397 vec_add1 (xd->d_trace_buffers, bi0);
1399 next_worker_index = first_worker_index;
1402 * Force unknown traffic onto worker 0,
1403 * and into ethernet-input. $$$$ add more hashes.
1405 h0 = (ethernet_header_t *) b0->data;
1407 /* Compute ingress LB hash */
1408 hash_key = eth_get_key(h0);
1409 hash = (u32)clib_xxhash(hash_key);
1411 if (PREDICT_TRUE (is_pow2(num_workers)))
1412 next_worker_index += hash & (num_workers - 1);
1414 next_worker_index += hash % num_workers;
1416 /* if EFD is enabled and not already discarding from dpdk,
1417 * check the worker ring/queue for congestion
1419 if (PREDICT_FALSE(tm->efd.enabled && !efd_discard_burst))
1421 vlib_frame_queue_t *fq;
1423 /* fq will be valid if the ring is congested */
1424 fq = is_vlib_handoff_queue_congested(
1425 next_worker_index, tm->efd.queue_hi_thresh,
1426 congested_handoff_queue_by_worker_index);
1428 if (PREDICT_FALSE(fq != NULL))
1431 if (PREDICT_TRUE(cntr_type =
1432 is_efd_discardable(tm, b0, mb)))
1434 /* discard the packet */
1435 fq->enqueue_efd_discards++;
1436 increment_efd_drop_counter(vm, cntr_type, 1);
1437 rte_pktmbuf_free(mb);
1445 if (next_worker_index != current_worker_index)
1448 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1450 hf = dpdk_get_handoff_queue_elt(
1452 handoff_queue_elt_by_worker_index);
1454 n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
1455 to_next_worker = &hf->buffer_index[hf->n_vectors];
1456 current_worker_index = next_worker_index;
1459 /* enqueue to correct worker thread */
1460 to_next_worker[0] = bi0;
1462 n_left_to_next_worker--;
1464 if (n_left_to_next_worker == 0)
1466 hf->n_vectors = VLIB_FRAME_SIZE;
1467 vlib_put_handoff_queue_elt(hf);
1468 current_worker_index = ~0;
1469 handoff_queue_elt_by_worker_index[next_worker_index] = 0;
1477 if (PREDICT_FALSE (vec_len (xd->d_trace_buffers) > 0))
1479 /* credit the trace to the trace node */
1480 dpdk_rx_trace (dm, node_trace, xd, queue_id, xd->d_trace_buffers,
1481 vec_len (xd->d_trace_buffers));
1482 vlib_set_trace_count (vm, node_trace, n_trace - vec_len (xd->d_trace_buffers));
1485 vlib_increment_combined_counter
1486 (vnet_get_main()->interface_main.combined_sw_if_counters
1487 + VNET_INTERFACE_COUNTER_RX,
1489 xd->vlib_sw_if_index,
1490 mb_index, n_rx_bytes);
1492 dpdk_worker_t * dw = vec_elt_at_index(dm->workers, cpu_index);
1493 dw->aggregate_rx_packets += mb_index;
1497 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1499 /* Ship frames to the worker nodes */
1500 for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
1502 if (handoff_queue_elt_by_worker_index[i])
1504 hf = handoff_queue_elt_by_worker_index[i];
1506 * It works better to let the handoff node
1507 * rate-adapt, always ship the handoff queue element.
1509 if (1 || hf->n_vectors == hf->last_n_vectors)
1511 vlib_put_handoff_queue_elt(hf);
1512 handoff_queue_elt_by_worker_index[i] = 0;
1515 hf->last_n_vectors = hf->n_vectors;
1517 congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *)(~0);
1520 current_worker_index = ~0;
1522 vlib_increment_main_loop_counter (vm);
1527 * This function is used when the main thread performs IO and feeds the
1531 dpdk_io_input (vlib_main_t * vm,
1532 vlib_node_runtime_t * node,
1535 dpdk_main_t * dm = &dpdk_main;
1537 vlib_thread_main_t * tm = vlib_get_thread_main();
1538 uword n_rx_packets = 0;
1539 static vlib_frame_queue_elt_t ** handoff_queue_elt_by_worker_index;
1540 static vlib_frame_queue_t ** congested_handoff_queue_by_worker_index = 0;
1541 vlib_frame_queue_elt_t * hf = 0;
1543 u32 n_left_to_next_worker = 0, * to_next_worker = 0;
1544 u32 next_worker_index = 0;
1545 u32 current_worker_index = ~0;
1546 u32 cpu_index = os_get_cpu_number();
1547 static int num_workers_set;
1548 static u32 num_workers;
1550 vlib_node_runtime_t * node_trace;
1551 static u32 first_worker_index;
1552 u32 buffer_flags_template;
1554 if (PREDICT_FALSE(num_workers_set == 0))
1557 vlib_thread_registration_t * tr;
1558 /* Only the standard vnet worker threads are supported */
1559 p = hash_get_mem (tm->thread_registrations_by_name, "workers");
1560 tr = (vlib_thread_registration_t *) p[0];
1563 num_workers = tr->count;
1564 first_worker_index = tr->first_index;
1566 num_workers_set = 1;
1569 if (PREDICT_FALSE(handoff_queue_elt_by_worker_index == 0))
1571 vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1);
1573 vec_validate_init_empty (congested_handoff_queue_by_worker_index,
1574 first_worker_index + num_workers - 1,
1575 (vlib_frame_queue_t *)(~0));
1578 /* packet tracing is triggered on the dpdk-input node for ease-of-use */
1579 node_trace = vlib_node_get_runtime (vm, dpdk_input_node.index);
1581 buffer_flags_template = dm->buffer_flags_template;
1583 vec_foreach (xd, dm->devices)
1587 uword n_rx_bytes = 0;
1588 u32 n_trace, trace_cnt __attribute__((unused));
1589 vlib_buffer_free_list_t * fl;
1592 u8 efd_discard_burst = 0;
1597 n_buffers = dpdk_rx_burst(dm, xd, queue_id );
1601 /* check if EFD (dpdk) is enabled */
1602 if (PREDICT_FALSE(dm->efd.enabled))
1604 /* reset a few stats */
1605 xd->efd_agent.last_poll_time = 0;
1606 xd->efd_agent.last_burst_sz = 0;
1611 vec_reset_length (xd->d_trace_buffers);
1612 trace_cnt = n_trace = vlib_get_trace_count (vm, node_trace);
1615 * DAW-FIXME: VMXNET3 device stop/start doesn't work,
1616 * therefore fake the stop in the dpdk driver by
1617 * silently dropping all of the incoming pkts instead of
1618 * stopping the driver / hardware.
1620 if (PREDICT_FALSE(xd->admin_up != 1))
1622 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1623 rte_pktmbuf_free (xd->rx_vectors[queue_id][mb_index]);
1627 /* Check for congestion if EFD (Early-Fast-Discard) is enabled
1628 * in any mode (e.g. dpdk, monitor, or drop_all)
1630 if (PREDICT_FALSE(dm->efd.enabled))
1632 /* update EFD counters */
1633 dpdk_efd_update_counters(xd, n_buffers, dm->efd.enabled);
1635 if (PREDICT_FALSE(dm->efd.enabled & DPDK_EFD_DROPALL_ENABLED))
1637 /* discard all received packets */
1638 for (mb_index = 0; mb_index < n_buffers; mb_index++)
1639 rte_pktmbuf_free(xd->rx_vectors[queue_id][mb_index]);
1641 xd->efd_agent.discard_cnt += n_buffers;
1642 increment_efd_drop_counter(vm,
1643 DPDK_ERROR_VLAN_EFD_DROP_PKTS,
1649 if (PREDICT_FALSE(xd->efd_agent.consec_full_frames_cnt >=
1650 dm->efd.consec_full_frames_hi_thresh))
1652 u32 device_queue_sz = rte_eth_rx_queue_count(xd->device_index,
1654 if (device_queue_sz >= dm->efd.queue_hi_thresh)
1656 /* dpdk device queue has reached the critical threshold */
1657 xd->efd_agent.congestion_cnt++;
1659 /* apply EFD to packets from the burst */
1660 efd_discard_burst = 1;
1665 fl = vlib_buffer_get_free_list
1666 (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
1670 while (n_buffers > 0)
1675 vlib_buffer_t * b0, * b_seg, * b_chain = 0;
1676 ethernet_header_t * h0;
1678 struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index];
1679 struct rte_mbuf *mb_seg = mb->next;
1681 if (PREDICT_TRUE(n_buffers > 1))
1683 struct rte_mbuf *pfmb = xd->rx_vectors[queue_id][mb_index+2];
1684 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1685 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1686 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1687 CLIB_PREFETCH (bp->data, CLIB_CACHE_LINE_BYTES, LOAD);
1690 b0 = vlib_buffer_from_rte_mbuf(mb);
1692 /* check whether EFD is looking for packets to discard */
1693 if (PREDICT_FALSE(efd_discard_burst))
1696 if (PREDICT_TRUE(cntr_type = is_efd_discardable(tm, b0, mb)))
1698 rte_pktmbuf_free(mb);
1699 xd->efd_agent.discard_cnt++;
1700 increment_efd_drop_counter(vm,
1710 /* Prefetch one next segment if it exists */
1711 if (PREDICT_FALSE(mb->nb_segs > 1))
1713 struct rte_mbuf *pfmb = mb->next;
1714 vlib_buffer_t *bp = vlib_buffer_from_rte_mbuf(pfmb);
1715 CLIB_PREFETCH (pfmb, CLIB_CACHE_LINE_BYTES, LOAD);
1716 CLIB_PREFETCH (bp, CLIB_CACHE_LINE_BYTES, STORE);
1720 bi0 = vlib_get_buffer_index (vm, b0);
1721 vlib_buffer_init_for_free_list (b0, fl);
1722 b0->clone_count = 0;
1724 dpdk_rx_next_and_error_from_mb_flags_x1 (xd, mb, b0,
1726 #ifdef RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS
1728 * Clear overloaded TX offload flags when a DPDK driver
1729 * is using them for RX flags (e.g. Cisco VIC Ethernet driver)
1731 if (PREDICT_TRUE(trace_cnt == 0))
1732 mb->ol_flags &= PKT_EXT_RX_CLR_TX_FLAGS_MASK;
1735 #endif /* RTE_LIBRTE_MBUF_EXT_RX_OLFLAGS */
1738 clib_warning ("bi %d error %d", bi0, error0);
1742 l3_offset0 = ((next0 == DPDK_RX_NEXT_IP4_INPUT ||
1743 next0 == DPDK_RX_NEXT_IP6_INPUT ||
1744 next0 == DPDK_RX_NEXT_MPLS_INPUT) ?
1745 sizeof (ethernet_header_t) : 0);
1747 b0->current_data = l3_offset0;
1748 b0->current_length = mb->data_len - l3_offset0;
1750 b0->flags = buffer_flags_template;
1752 if (VMWARE_LENGTH_BUG_WORKAROUND)
1753 b0->current_length -= 4;
1755 vnet_buffer(b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
1756 vnet_buffer(b0)->sw_if_index[VLIB_TX] = (u32)~0;
1757 vnet_buffer(b0)->io_handoff.next_index = next0;
1758 n_rx_bytes += mb->pkt_len;
1760 /* Process subsequent segments of multi-segment packets */
1761 while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
1763 ASSERT(mb_seg != 0);
1765 b_seg = vlib_buffer_from_rte_mbuf(mb_seg);
1766 vlib_buffer_init_for_free_list (b_seg, fl);
1767 b_seg->clone_count = 0;
1769 ASSERT((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
1770 ASSERT(b_seg->current_data == 0);
1773 * The driver (e.g. virtio) may not put the packet data at the start
1774 * of the segment, so don't assume b_seg->current_data == 0 is correct.
1776 b_seg->current_data = (mb_seg->buf_addr + mb_seg->data_off) - (void *)b_seg->data;
1778 b_seg->current_length = mb_seg->data_len;
1779 b0->total_length_not_including_first_buffer +=
1782 b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
1783 b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
1786 mb_seg = mb_seg->next;
1791 * Turn this on if you run into
1792 * "bad monkey" contexts, and you want to know exactly
1793 * which nodes they've visited... See main.c...
1795 VLIB_BUFFER_TRACE_TRAJECTORY_INIT(b0);
1797 if (PREDICT_FALSE (n_trace > mb_index))
1798 vec_add1 (xd->d_trace_buffers, bi0);
1800 next_worker_index = first_worker_index;
1803 * Force unknown traffic onto worker 0,
1804 * and into ethernet-input. $$$$ add more hashes.
1806 h0 = (ethernet_header_t *) b0->data;
1808 /* Compute ingress LB hash */
1809 hash_key = eth_get_key(h0);
1810 hash = (u32)clib_xxhash(hash_key);
1812 if (PREDICT_TRUE (is_pow2(num_workers)))
1813 next_worker_index += hash & (num_workers - 1);
1815 next_worker_index += hash % num_workers;
1817 /* if EFD is enabled and not already discarding from dpdk,
1818 * check the worker ring/queue for congestion
1820 if (PREDICT_FALSE(tm->efd.enabled && !efd_discard_burst))
1822 vlib_frame_queue_t *fq;
1824 /* fq will be valid if the ring is congested */
1825 fq = is_vlib_handoff_queue_congested(
1826 next_worker_index, tm->efd.queue_hi_thresh,
1827 congested_handoff_queue_by_worker_index);
1829 if (PREDICT_FALSE(fq != NULL))
1832 if (PREDICT_TRUE(cntr_type =
1833 is_efd_discardable(tm, b0, mb)))
1835 /* discard the packet */
1836 fq->enqueue_efd_discards++;
1837 increment_efd_drop_counter(vm, cntr_type, 1);
1838 rte_pktmbuf_free(mb);
1846 if (next_worker_index != current_worker_index)
1849 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1851 hf = dpdk_get_handoff_queue_elt(
1853 handoff_queue_elt_by_worker_index);
1855 n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
1856 to_next_worker = &hf->buffer_index[hf->n_vectors];
1857 current_worker_index = next_worker_index;
1860 /* enqueue to correct worker thread */
1861 to_next_worker[0] = bi0;
1863 n_left_to_next_worker--;
1865 if (n_left_to_next_worker == 0)
1867 hf->n_vectors = VLIB_FRAME_SIZE;
1868 vlib_put_handoff_queue_elt(hf);
1869 current_worker_index = ~0;
1870 handoff_queue_elt_by_worker_index[next_worker_index] = 0;
1878 if (PREDICT_FALSE (vec_len (xd->d_trace_buffers) > 0))
1880 /* credit the trace to the trace node */
1881 dpdk_rx_trace (dm, node_trace, xd, queue_id, xd->d_trace_buffers,
1882 vec_len (xd->d_trace_buffers));
1883 vlib_set_trace_count (vm, node_trace, n_trace - vec_len (xd->d_trace_buffers));
1886 vlib_increment_combined_counter
1887 (vnet_get_main()->interface_main.combined_sw_if_counters
1888 + VNET_INTERFACE_COUNTER_RX,
1890 xd->vlib_sw_if_index,
1891 mb_index, n_rx_bytes);
1893 dpdk_worker_t * dw = vec_elt_at_index(dm->workers, cpu_index);
1894 dw->aggregate_rx_packets += mb_index;
1895 n_rx_packets += mb_index;
1899 hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
1901 /* Ship frames to the worker nodes */
1902 for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
1904 if (handoff_queue_elt_by_worker_index[i])
1906 hf = handoff_queue_elt_by_worker_index[i];
1908 * It works better to let the handoff node
1909 * rate-adapt, always ship the handoff queue element.
1911 if (1 || hf->n_vectors == hf->last_n_vectors)
1913 vlib_put_handoff_queue_elt(hf);
1914 handoff_queue_elt_by_worker_index[i] = 0;
1917 hf->last_n_vectors = hf->n_vectors;
1919 congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *)(~0);
1922 current_worker_index = ~0;
1923 return n_rx_packets;
1926 VLIB_REGISTER_NODE (dpdk_io_input_node) = {
1927 .function = dpdk_io_input,
1928 .type = VLIB_NODE_TYPE_INPUT,
1929 .name = "dpdk-io-input",
1931 /* Will be enabled if/when hardware is detected. */
1932 .state = VLIB_NODE_STATE_DISABLED,
1934 .format_buffer = format_ethernet_header_with_length,
1935 .format_trace = format_dpdk_rx_dma_trace,
1937 .n_errors = DPDK_N_ERROR,
1938 .error_strings = dpdk_error_strings,
1940 .n_next_nodes = DPDK_RX_N_NEXT,
1942 [DPDK_RX_NEXT_DROP] = "error-drop",
1943 [DPDK_RX_NEXT_ETHERNET_INPUT] = "ethernet-input",
1944 [DPDK_RX_NEXT_IP4_INPUT] = "ip4-input-no-checksum",
1945 [DPDK_RX_NEXT_IP6_INPUT] = "ip6-input",
1946 [DPDK_RX_NEXT_MPLS_INPUT] = "mpls-gre-input",
1952 * Based on the operation type, set lower/upper bits for the given index value
1955 set_efd_bitmap (u8 *bitmap, u32 value, u32 op)
1960 for (ix = 0; ix < 8; ix++) {
1961 if (((op == EFD_OPERATION_LESS_THAN) && (ix < value)) ||
1962 ((op == EFD_OPERATION_GREATER_OR_EQUAL) && (ix >= value))){
1963 (*bitmap) |= (1 << ix);
1969 efd_config (u32 enabled,
1970 u32 ip_prec, u32 ip_op,
1971 u32 mpls_exp, u32 mpls_op,
1972 u32 vlan_cos, u32 vlan_op)
1974 vlib_thread_main_t * tm = vlib_get_thread_main();
1975 dpdk_main_t * dm = &dpdk_main;
1978 tm->efd.enabled |= VLIB_EFD_DISCARD_ENABLED;
1979 dm->efd.enabled |= DPDK_EFD_DISCARD_ENABLED;
1981 tm->efd.enabled &= ~VLIB_EFD_DISCARD_ENABLED;
1982 dm->efd.enabled &= ~DPDK_EFD_DISCARD_ENABLED;
1985 set_efd_bitmap(&tm->efd.ip_prec_bitmap, ip_prec, ip_op);
1986 set_efd_bitmap(&tm->efd.mpls_exp_bitmap, mpls_exp, mpls_op);
1987 set_efd_bitmap(&tm->efd.vlan_cos_bitmap, vlan_cos, vlan_op);