--- /dev/null
+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <vnet/vnet.h>
+#include <vppinfra/vec.h>
+#include <vppinfra/error.h>
+#include <vppinfra/format.h>
+#include <vppinfra/xxhash.h>
+
+#include <vnet/ethernet/ethernet.h>
+#include <vnet/devices/dpdk/dpdk.h>
+#include <vnet/classify/vnet_classify.h>
+#include <vnet/mpls/packet.h>
+#include <vnet/handoff.h>
+#include <vnet/devices/devices.h>
+#include <vnet/feature/feature.h>
+
+#include "dpdk_priv.h"
+
+static char *dpdk_error_strings[] = {
+#define _(n,s) s,
+ foreach_dpdk_error
+#undef _
+};
+
+always_inline int
+vlib_buffer_is_ip4 (vlib_buffer_t * b)
+{
+ ethernet_header_t *h = (ethernet_header_t *) b->data;
+ return (h->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP4));
+}
+
+always_inline int
+vlib_buffer_is_ip6 (vlib_buffer_t * b)
+{
+ ethernet_header_t *h = (ethernet_header_t *) b->data;
+ return (h->type == clib_host_to_net_u16 (ETHERNET_TYPE_IP6));
+}
+
+always_inline int
+vlib_buffer_is_mpls (vlib_buffer_t * b)
+{
+ ethernet_header_t *h = (ethernet_header_t *) b->data;
+ return (h->type == clib_host_to_net_u16 (ETHERNET_TYPE_MPLS_UNICAST));
+}
+
+#if RTE_VERSION < RTE_VERSION_NUM(16, 11, 0, 0)
+/* New ol_flags bits added in DPDK-16.11 */
+#define PKT_RX_IP_CKSUM_GOOD (1ULL << 7)
+#endif
+
+always_inline u32
+dpdk_rx_next_from_etype (struct rte_mbuf * mb, vlib_buffer_t * b0)
+{
+ if (PREDICT_TRUE (vlib_buffer_is_ip4 (b0)))
+ if (PREDICT_TRUE ((mb->ol_flags & PKT_RX_IP_CKSUM_GOOD) != 0))
+ return VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
+ else
+ return VNET_DEVICE_INPUT_NEXT_IP4_INPUT;
+ else if (PREDICT_TRUE (vlib_buffer_is_ip6 (b0)))
+ return VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
+ else if (PREDICT_TRUE (vlib_buffer_is_mpls (b0)))
+ return VNET_DEVICE_INPUT_NEXT_MPLS_INPUT;
+ else
+ return VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+}
+
+always_inline int
+dpdk_mbuf_is_vlan (struct rte_mbuf *mb)
+{
+#if RTE_VERSION >= RTE_VERSION_NUM(16, 11, 0, 0)
+ return (mb->packet_type & RTE_PTYPE_L2_ETHER_VLAN) ==
+ RTE_PTYPE_L2_ETHER_VLAN;
+#else
+ return
+ (mb->ol_flags &
+ (PKT_RX_VLAN_PKT | PKT_RX_VLAN_STRIPPED | PKT_RX_QINQ_STRIPPED)) ==
+ PKT_RX_VLAN_PKT;
+#endif
+}
+
+always_inline int
+dpdk_mbuf_is_ip4 (struct rte_mbuf *mb)
+{
+ return RTE_ETH_IS_IPV4_HDR (mb->packet_type) != 0;
+}
+
+always_inline int
+dpdk_mbuf_is_ip6 (struct rte_mbuf *mb)
+{
+ return RTE_ETH_IS_IPV6_HDR (mb->packet_type) != 0;
+}
+
+always_inline u32
+dpdk_rx_next_from_mb (struct rte_mbuf * mb, vlib_buffer_t * b0)
+{
+ if (PREDICT_FALSE (dpdk_mbuf_is_vlan (mb)))
+ return VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ else if (PREDICT_TRUE (dpdk_mbuf_is_ip4 (mb)))
+ return VNET_DEVICE_INPUT_NEXT_IP4_NCS_INPUT;
+ else if (PREDICT_TRUE (dpdk_mbuf_is_ip6 (mb)))
+ return VNET_DEVICE_INPUT_NEXT_IP6_INPUT;
+ else if (PREDICT_TRUE (vlib_buffer_is_mpls (b0)))
+ return VNET_DEVICE_INPUT_NEXT_MPLS_INPUT;
+ else
+ return dpdk_rx_next_from_etype (mb, b0);
+}
+
+always_inline void
+dpdk_rx_error_from_mb (struct rte_mbuf *mb, u32 * next, u8 * error)
+{
+ if (mb->ol_flags & PKT_RX_IP_CKSUM_BAD)
+ {
+ *error = DPDK_ERROR_IP_CHECKSUM_ERROR;
+ *next = VNET_DEVICE_INPUT_NEXT_DROP;
+ }
+ else
+ *error = DPDK_ERROR_NONE;
+}
+
+void
+dpdk_rx_trace (dpdk_main_t * dm,
+ vlib_node_runtime_t * node,
+ dpdk_device_t * xd,
+ u16 queue_id, u32 * buffers, uword n_buffers)
+{
+ vlib_main_t *vm = vlib_get_main ();
+ u32 *b, n_left;
+ u32 next0;
+
+ n_left = n_buffers;
+ b = buffers;
+
+ while (n_left >= 1)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ dpdk_rx_dma_trace_t *t0;
+ struct rte_mbuf *mb;
+ u8 error0;
+
+ bi0 = b[0];
+ n_left -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ mb = rte_mbuf_from_vlib_buffer (b0);
+
+ if (PREDICT_FALSE (xd->per_interface_next_index != ~0))
+ next0 = xd->per_interface_next_index;
+ else if (PREDICT_TRUE
+ ((xd->flags & DPDK_DEVICE_FLAG_PMD_SUPPORTS_PTYPE) != 0))
+ next0 = dpdk_rx_next_from_mb (mb, b0);
+ else
+ next0 = dpdk_rx_next_from_etype (mb, b0);
+
+ dpdk_rx_error_from_mb (mb, &next0, &error0);
+
+ vlib_trace_buffer (vm, node, next0, b0, /* follow_chain */ 0);
+ t0 = vlib_add_trace (vm, node, b0, sizeof (t0[0]));
+ t0->queue_index = queue_id;
+ t0->device_index = xd->device_index;
+ t0->buffer_index = bi0;
+
+ clib_memcpy (&t0->mb, mb, sizeof (t0->mb));
+ clib_memcpy (&t0->buffer, b0, sizeof (b0[0]) - sizeof (b0->pre_data));
+ clib_memcpy (t0->buffer.pre_data, b0->data,
+ sizeof (t0->buffer.pre_data));
+ clib_memcpy (&t0->data, mb->buf_addr + mb->data_off, sizeof (t0->data));
+
+ b += 1;
+ }
+}
+
+static inline u32
+dpdk_rx_burst (dpdk_main_t * dm, dpdk_device_t * xd, u16 queue_id)
+{
+ u32 n_buffers;
+ u32 n_left;
+ u32 n_this_chunk;
+
+ n_left = VLIB_FRAME_SIZE;
+ n_buffers = 0;
+
+ if (PREDICT_TRUE (xd->flags & DPDK_DEVICE_FLAG_PMD))
+ {
+ while (n_left)
+ {
+ n_this_chunk = rte_eth_rx_burst (xd->device_index, queue_id,
+ xd->rx_vectors[queue_id] +
+ n_buffers, n_left);
+ n_buffers += n_this_chunk;
+ n_left -= n_this_chunk;
+
+ /* Empirically, DPDK r1.8 produces vectors w/ 32 or fewer elts */
+ if (n_this_chunk < 32)
+ break;
+ }
+ }
+ else
+ {
+ ASSERT (0);
+ }
+
+ return n_buffers;
+}
+
+
+static_always_inline void
+dpdk_process_subseq_segs (vlib_main_t * vm, vlib_buffer_t * b,
+ struct rte_mbuf *mb, vlib_buffer_free_list_t * fl)
+{
+ u8 nb_seg = 1;
+ struct rte_mbuf *mb_seg = 0;
+ vlib_buffer_t *b_seg, *b_chain = 0;
+ mb_seg = mb->next;
+ b_chain = b;
+
+ while ((mb->nb_segs > 1) && (nb_seg < mb->nb_segs))
+ {
+ ASSERT (mb_seg != 0);
+
+ b_seg = vlib_buffer_from_rte_mbuf (mb_seg);
+ vlib_buffer_init_for_free_list (b_seg, fl);
+
+ ASSERT ((b_seg->flags & VLIB_BUFFER_NEXT_PRESENT) == 0);
+ ASSERT (b_seg->current_data == 0);
+
+ /*
+ * The driver (e.g. virtio) may not put the packet data at the start
+ * of the segment, so don't assume b_seg->current_data == 0 is correct.
+ */
+ b_seg->current_data =
+ (mb_seg->buf_addr + mb_seg->data_off) - (void *) b_seg->data;
+
+ b_seg->current_length = mb_seg->data_len;
+ b->total_length_not_including_first_buffer += mb_seg->data_len;
+
+ b_chain->flags |= VLIB_BUFFER_NEXT_PRESENT;
+ b_chain->next_buffer = vlib_get_buffer_index (vm, b_seg);
+
+ b_chain = b_seg;
+ mb_seg = mb_seg->next;
+ nb_seg++;
+ }
+}
+
+static_always_inline void
+dpdk_prefetch_buffer (struct rte_mbuf *mb)
+{
+ vlib_buffer_t *b = vlib_buffer_from_rte_mbuf (mb);
+ CLIB_PREFETCH (mb, CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (b, CLIB_CACHE_LINE_BYTES, STORE);
+}
+
+/*
+ * This function is used when there are no worker threads.
+ * The main thread performs IO and forwards the packets.
+ */
+static_always_inline u32
+dpdk_device_input (dpdk_main_t * dm, dpdk_device_t * xd,
+ vlib_node_runtime_t * node, u32 cpu_index, u16 queue_id)
+{
+ u32 n_buffers;
+ u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ u32 n_left_to_next, *to_next;
+ u32 mb_index;
+ vlib_main_t *vm = vlib_get_main ();
+ uword n_rx_bytes = 0;
+ u32 n_trace, trace_cnt __attribute__ ((unused));
+ vlib_buffer_free_list_t *fl;
+ u32 buffer_flags_template;
+
+ if ((xd->flags & DPDK_DEVICE_FLAG_ADMIN_UP) == 0)
+ return 0;
+
+ n_buffers = dpdk_rx_burst (dm, xd, queue_id);
+
+ if (n_buffers == 0)
+ {
+ return 0;
+ }
+
+ buffer_flags_template = dm->buffer_flags_template;
+
+ vec_reset_length (xd->d_trace_buffers[cpu_index]);
+ trace_cnt = n_trace = vlib_get_trace_count (vm, node);
+
+ if (n_trace > 0)
+ {
+ u32 n = clib_min (n_trace, n_buffers);
+ mb_index = 0;
+
+ while (n--)
+ {
+ struct rte_mbuf *mb = xd->rx_vectors[queue_id][mb_index++];
+ vlib_buffer_t *b = vlib_buffer_from_rte_mbuf (mb);
+ vec_add1 (xd->d_trace_buffers[cpu_index],
+ vlib_get_buffer_index (vm, b));
+ }
+ }
+
+ fl = vlib_buffer_get_free_list (vm, VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+
+ mb_index = 0;
+
+ while (n_buffers > 0)
+ {
+ vlib_buffer_t *b0, *b1, *b2, *b3;
+ u32 bi0, next0, l3_offset0;
+ u32 bi1, next1, l3_offset1;
+ u32 bi2, next2, l3_offset2;
+ u32 bi3, next3, l3_offset3;
+ u8 error0, error1, error2, error3;
+ u64 or_ol_flags;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_buffers > 8 && n_left_to_next > 4)
+ {
+ struct rte_mbuf *mb0 = xd->rx_vectors[queue_id][mb_index];
+ struct rte_mbuf *mb1 = xd->rx_vectors[queue_id][mb_index + 1];
+ struct rte_mbuf *mb2 = xd->rx_vectors[queue_id][mb_index + 2];
+ struct rte_mbuf *mb3 = xd->rx_vectors[queue_id][mb_index + 3];
+
+ dpdk_prefetch_buffer (xd->rx_vectors[queue_id][mb_index + 4]);
+ dpdk_prefetch_buffer (xd->rx_vectors[queue_id][mb_index + 5]);
+ dpdk_prefetch_buffer (xd->rx_vectors[queue_id][mb_index + 6]);
+ dpdk_prefetch_buffer (xd->rx_vectors[queue_id][mb_index + 7]);
+
+ if (xd->flags & DPDK_DEVICE_FLAG_MAYBE_MULTISEG)
+ {
+ if (PREDICT_FALSE (mb0->nb_segs > 1))
+ dpdk_prefetch_buffer (mb0->next);
+ if (PREDICT_FALSE (mb1->nb_segs > 1))
+ dpdk_prefetch_buffer (mb1->next);
+ if (PREDICT_FALSE (mb2->nb_segs > 1))
+ dpdk_prefetch_buffer (mb2->next);
+ if (PREDICT_FALSE (mb3->nb_segs > 1))
+ dpdk_prefetch_buffer (mb3->next);
+ }
+
+ ASSERT (mb0);
+ ASSERT (mb1);
+ ASSERT (mb2);
+ ASSERT (mb3);
+
+ or_ol_flags = (mb0->ol_flags | mb1->ol_flags |
+ mb2->ol_flags | mb3->ol_flags);
+ b0 = vlib_buffer_from_rte_mbuf (mb0);
+ b1 = vlib_buffer_from_rte_mbuf (mb1);
+ b2 = vlib_buffer_from_rte_mbuf (mb2);
+ b3 = vlib_buffer_from_rte_mbuf (mb3);
+
+ vlib_buffer_init_for_free_list (b0, fl);
+ vlib_buffer_init_for_free_list (b1, fl);
+ vlib_buffer_init_for_free_list (b2, fl);
+ vlib_buffer_init_for_free_list (b3, fl);
+
+ bi0 = vlib_get_buffer_index (vm, b0);
+ bi1 = vlib_get_buffer_index (vm, b1);
+ bi2 = vlib_get_buffer_index (vm, b2);
+ bi3 = vlib_get_buffer_index (vm, b3);
+
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ to_next[2] = bi2;
+ to_next[3] = bi3;
+ to_next += 4;
+ n_left_to_next -= 4;
+
+ if (PREDICT_FALSE (xd->per_interface_next_index != ~0))
+ {
+ next0 = next1 = next2 = next3 = xd->per_interface_next_index;
+ }
+ else if (PREDICT_TRUE
+ ((xd->flags & DPDK_DEVICE_FLAG_PMD_SUPPORTS_PTYPE) != 0))
+ {
+ next0 = dpdk_rx_next_from_mb (mb0, b0);
+ next1 = dpdk_rx_next_from_mb (mb1, b1);
+ next2 = dpdk_rx_next_from_mb (mb2, b2);
+ next3 = dpdk_rx_next_from_mb (mb3, b3);
+ }
+ else
+ {
+ next0 = dpdk_rx_next_from_etype (mb0, b0);
+ next1 = dpdk_rx_next_from_etype (mb1, b1);
+ next2 = dpdk_rx_next_from_etype (mb2, b2);
+ next3 = dpdk_rx_next_from_etype (mb3, b3);
+ }
+
+ if (PREDICT_FALSE (or_ol_flags & PKT_RX_IP_CKSUM_BAD))
+ {
+ dpdk_rx_error_from_mb (mb0, &next0, &error0);
+ dpdk_rx_error_from_mb (mb1, &next1, &error1);
+ dpdk_rx_error_from_mb (mb2, &next2, &error2);
+ dpdk_rx_error_from_mb (mb3, &next3, &error3);
+ b0->error = node->errors[error0];
+ b1->error = node->errors[error1];
+ b2->error = node->errors[error2];
+ b3->error = node->errors[error3];
+ }
+ else
+ {
+ b0->error = b1->error = node->errors[DPDK_ERROR_NONE];
+ b2->error = b3->error = node->errors[DPDK_ERROR_NONE];
+ }
+
+ l3_offset0 = device_input_next_node_advance[next0];
+ l3_offset1 = device_input_next_node_advance[next1];
+ l3_offset2 = device_input_next_node_advance[next2];
+ l3_offset3 = device_input_next_node_advance[next3];
+
+ b0->current_data = l3_offset0 + mb0->data_off;
+ b1->current_data = l3_offset1 + mb1->data_off;
+ b2->current_data = l3_offset2 + mb2->data_off;
+ b3->current_data = l3_offset3 + mb3->data_off;
+
+ b0->current_data -= RTE_PKTMBUF_HEADROOM;
+ b1->current_data -= RTE_PKTMBUF_HEADROOM;
+ b2->current_data -= RTE_PKTMBUF_HEADROOM;
+ b3->current_data -= RTE_PKTMBUF_HEADROOM;
+
+ b0->current_length = mb0->data_len - l3_offset0;
+ b1->current_length = mb1->data_len - l3_offset1;
+ b2->current_length = mb2->data_len - l3_offset2;
+ b3->current_length = mb3->data_len - l3_offset3;
+
+ b0->flags = buffer_flags_template;
+ b1->flags = buffer_flags_template;
+ b2->flags = buffer_flags_template;
+ b3->flags = buffer_flags_template;
+
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
+ vnet_buffer (b1)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
+ vnet_buffer (b2)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
+ vnet_buffer (b3)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ vnet_buffer (b2)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ vnet_buffer (b3)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+
+ n_rx_bytes += mb0->pkt_len;
+ n_rx_bytes += mb1->pkt_len;
+ n_rx_bytes += mb2->pkt_len;
+ n_rx_bytes += mb3->pkt_len;
+
+ /* Process subsequent segments of multi-segment packets */
+ if (xd->flags & DPDK_DEVICE_FLAG_MAYBE_MULTISEG)
+ {
+ dpdk_process_subseq_segs (vm, b0, mb0, fl);
+ dpdk_process_subseq_segs (vm, b1, mb1, fl);
+ dpdk_process_subseq_segs (vm, b2, mb2, fl);
+ dpdk_process_subseq_segs (vm, b3, mb3, fl);
+ }
+
+ /*
+ * Turn this on if you run into
+ * "bad monkey" contexts, and you want to know exactly
+ * which nodes they've visited... See main.c...
+ */
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b1);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b2);
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b3);
+
+ /* Do we have any driver RX features configured on the interface? */
+ vnet_feature_start_device_input_x4 (xd->vlib_sw_if_index,
+ &next0, &next1, &next2, &next3,
+ b0, b1, b2, b3,
+ l3_offset0, l3_offset1,
+ l3_offset2, l3_offset3);
+
+ vlib_validate_buffer_enqueue_x4 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, bi2, bi3,
+ next0, next1, next2, next3);
+ n_buffers -= 4;
+ mb_index += 4;
+ }
+ while (n_buffers > 0 && n_left_to_next > 0)
+ {
+ struct rte_mbuf *mb0 = xd->rx_vectors[queue_id][mb_index];
+
+ ASSERT (mb0);
+
+ b0 = vlib_buffer_from_rte_mbuf (mb0);
+
+ /* Prefetch one next segment if it exists. */
+ if (PREDICT_FALSE (mb0->nb_segs > 1))
+ dpdk_prefetch_buffer (mb0->next);
+
+ vlib_buffer_init_for_free_list (b0, fl);
+
+ bi0 = vlib_get_buffer_index (vm, b0);
+
+ to_next[0] = bi0;
+ to_next++;
+ n_left_to_next--;
+
+ if (PREDICT_FALSE (xd->per_interface_next_index != ~0))
+ next0 = xd->per_interface_next_index;
+ else if (PREDICT_TRUE
+ ((xd->flags & DPDK_DEVICE_FLAG_PMD_SUPPORTS_PTYPE) != 0))
+ next0 = dpdk_rx_next_from_mb (mb0, b0);
+ else
+ next0 = dpdk_rx_next_from_etype (mb0, b0);
+
+ dpdk_rx_error_from_mb (mb0, &next0, &error0);
+ b0->error = node->errors[error0];
+
+ l3_offset0 = device_input_next_node_advance[next0];
+
+ b0->current_data = l3_offset0;
+ b0->current_data += mb0->data_off - RTE_PKTMBUF_HEADROOM;
+ b0->current_length = mb0->data_len - l3_offset0;
+
+ b0->flags = buffer_flags_template;
+
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = xd->vlib_sw_if_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0;
+ n_rx_bytes += mb0->pkt_len;
+
+ /* Process subsequent segments of multi-segment packets */
+ dpdk_process_subseq_segs (vm, b0, mb0, fl);
+
+ /*
+ * Turn this on if you run into
+ * "bad monkey" contexts, and you want to know exactly
+ * which nodes they've visited... See main.c...
+ */
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (b0);
+
+ /* Do we have any driver RX features configured on the interface? */
+ vnet_feature_start_device_input_x1 (xd->vlib_sw_if_index, &next0,
+ b0, l3_offset0);
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ n_buffers--;
+ mb_index++;
+ }
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ if (PREDICT_FALSE (vec_len (xd->d_trace_buffers[cpu_index]) > 0))
+ {
+ dpdk_rx_trace (dm, node, xd, queue_id, xd->d_trace_buffers[cpu_index],
+ vec_len (xd->d_trace_buffers[cpu_index]));
+ vlib_set_trace_count (vm, node, n_trace -
+ vec_len (xd->d_trace_buffers[cpu_index]));
+ }
+
+ vlib_increment_combined_counter
+ (vnet_get_main ()->interface_main.combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX,
+ cpu_index, xd->vlib_sw_if_index, mb_index, n_rx_bytes);
+
+ dpdk_worker_t *dw = vec_elt_at_index (dm->workers, cpu_index);
+ dw->aggregate_rx_packets += mb_index;
+
+ return mb_index;
+}
+
+static inline void
+poll_rate_limit (dpdk_main_t * dm)
+{
+ /* Limit the poll rate by sleeping for N msec between polls */
+ if (PREDICT_FALSE (dm->poll_sleep != 0))
+ {
+ struct timespec ts, tsrem;
+
+ ts.tv_sec = 0;
+ ts.tv_nsec = 1000 * 1000 * dm->poll_sleep; /* 1ms */
+
+ while (nanosleep (&ts, &tsrem) < 0)
+ {
+ ts = tsrem;
+ }
+ }
+}
+
+/** \brief Main DPDK input node
+ @node dpdk-input
+
+ This is the main DPDK input node: across each assigned interface,
+ call rte_eth_rx_burst(...) or similar to obtain a vector of
+ packets to process. Handle early packet discard. Derive @c
+ vlib_buffer_t metadata from <code>struct rte_mbuf</code> metadata,
+ Depending on the resulting metadata: adjust <code>b->current_data,
+ b->current_length </code> and dispatch directly to
+ ip4-input-no-checksum, or ip6-input. Trace the packet if required.
+
+ @param vm vlib_main_t corresponding to the current thread
+ @param node vlib_node_runtime_t
+ @param f vlib_frame_t input-node, not used.
+
+ @par Graph mechanics: buffer metadata, next index usage
+
+ @em Uses:
+ - <code>struct rte_mbuf mb->ol_flags</code>
+ - PKT_RX_IP_CKSUM_BAD
+ - <code> RTE_ETH_IS_xxx_HDR(mb->packet_type) </code>
+ - packet classification result
+
+ @em Sets:
+ - <code>b->error</code> if the packet is to be dropped immediately
+ - <code>b->current_data, b->current_length</code>
+ - adjusted as needed to skip the L2 header in direct-dispatch cases
+ - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
+ - rx interface sw_if_index
+ - <code>vnet_buffer(b)->sw_if_index[VLIB_TX] = ~0</code>
+ - required by ipX-lookup
+ - <code>b->flags</code>
+ - to indicate multi-segment pkts (VLIB_BUFFER_NEXT_PRESENT), etc.
+
+ <em>Next Nodes:</em>
+ - Static arcs to: error-drop, ethernet-input,
+ ip4-input-no-checksum, ip6-input, mpls-input
+ - per-interface redirection, controlled by
+ <code>xd->per_interface_next_index</code>
+*/
+
+static uword
+dpdk_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * f)
+{
+ dpdk_main_t *dm = &dpdk_main;
+ dpdk_device_t *xd;
+ uword n_rx_packets = 0;
+ dpdk_device_and_queue_t *dq;
+ u32 cpu_index = os_get_cpu_number ();
+
+ /*
+ * Poll all devices on this cpu for input/interrupts.
+ */
+ /* *INDENT-OFF* */
+ vec_foreach (dq, dm->devices_by_cpu[cpu_index])
+ {
+ xd = vec_elt_at_index(dm->devices, dq->device);
+ n_rx_packets += dpdk_device_input (dm, xd, node, cpu_index, dq->queue_id);
+ }
+ /* *INDENT-ON* */
+
+ poll_rate_limit (dm);
+
+ return n_rx_packets;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (dpdk_input_node) = {
+ .function = dpdk_input,
+ .type = VLIB_NODE_TYPE_INPUT,
+ .name = "dpdk-input",
+ .sibling_of = "device-input",
+
+ /* Will be enabled if/when hardware is detected. */
+ .state = VLIB_NODE_STATE_DISABLED,
+
+ .format_buffer = format_ethernet_header_with_length,
+ .format_trace = format_dpdk_rx_dma_trace,
+
+ .n_errors = DPDK_N_ERROR,
+ .error_strings = dpdk_error_strings,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (dpdk_input_node, dpdk_input);
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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