diff options
Diffstat (limited to 'src/plugins/af_packet/node.c')
| -rw-r--r-- | src/plugins/af_packet/node.c | 845 |
1 files changed, 845 insertions, 0 deletions
diff --git a/src/plugins/af_packet/node.c b/src/plugins/af_packet/node.c new file mode 100644 index 00000000000..0ea4b3dfea7 --- /dev/null +++ b/src/plugins/af_packet/node.c @@ -0,0 +1,845 @@ +/* + *------------------------------------------------------------------ + * af_packet.c - linux kernel packet interface + * + * Copyright (c) 2016 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 <linux/if_packet.h> + +#include <vlib/vlib.h> +#include <vlib/unix/unix.h> +#include <vnet/ip/ip.h> +#include <vnet/ethernet/ethernet.h> +#include <vnet/interface/rx_queue_funcs.h> +#include <vnet/feature/feature.h> +#include <vnet/ethernet/packet.h> + +#include <af_packet/af_packet.h> +#include <vnet/devices/virtio/virtio_std.h> + +#define foreach_af_packet_input_error \ + _ (PARTIAL_PKT, "partial packet") \ + _ (TIMEDOUT_BLK, "timed out block") \ + _ (TOTAL_RECV_BLK, "total received block") +typedef enum +{ +#define _(f,s) AF_PACKET_INPUT_ERROR_##f, + foreach_af_packet_input_error +#undef _ + AF_PACKET_INPUT_N_ERROR, +} af_packet_input_error_t; + +static char *af_packet_input_error_strings[] = { +#define _(n,s) s, + foreach_af_packet_input_error +#undef _ +}; + +typedef struct +{ + u32 next_index; + u32 hw_if_index; + u16 queue_id; + int block; + u32 pkt_num; + void *block_start; + block_desc_t bd; + union + { + tpacket3_hdr_t tph3; + tpacket2_hdr_t tph2; + }; + vnet_virtio_net_hdr_t vnet_hdr; + u8 is_v3; +} af_packet_input_trace_t; + +static u8 * +format_af_packet_input_trace (u8 * s, va_list * args) +{ + CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); + CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); + af_packet_input_trace_t *t = va_arg (*args, af_packet_input_trace_t *); + u32 indent = format_get_indent (s); + + s = format (s, "af_packet: hw_if_index %d rx-queue %u next-index %d", + t->hw_if_index, t->queue_id, t->next_index); + + if (t->is_v3) + { + s = format ( + s, "\n%Ublock %u:\n%Uaddress %p version %u seq_num %lu pkt_num %u", + format_white_space, indent + 2, t->block, format_white_space, + indent + 4, t->block_start, t->bd.version, t->bd.hdr.bh1.seq_num, + t->pkt_num); + s = format ( + s, + "\n%Utpacket3_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u" + "\n%Usec 0x%x nsec 0x%x vlan %U" +#ifdef TP_STATUS_VLAN_TPID_VALID + " vlan_tpid %u" +#endif + , + format_white_space, indent + 2, format_white_space, indent + 4, + t->tph3.tp_status, t->tph3.tp_len, t->tph3.tp_snaplen, t->tph3.tp_mac, + t->tph3.tp_net, format_white_space, indent + 4, t->tph3.tp_sec, + t->tph3.tp_nsec, format_ethernet_vlan_tci, t->tph3.hv1.tp_vlan_tci +#ifdef TP_STATUS_VLAN_TPID_VALID + , + t->tph3.hv1.tp_vlan_tpid +#endif + ); + } + else + { + s = format ( + s, + "\n%Utpacket2_hdr:\n%Ustatus 0x%x len %u snaplen %u mac %u net %u" + "\n%Usec 0x%x nsec 0x%x vlan %U" +#ifdef TP_STATUS_VLAN_TPID_VALID + " vlan_tpid %u" +#endif + , + format_white_space, indent + 2, format_white_space, indent + 4, + t->tph2.tp_status, t->tph2.tp_len, t->tph2.tp_snaplen, t->tph2.tp_mac, + t->tph2.tp_net, format_white_space, indent + 4, t->tph2.tp_sec, + t->tph2.tp_nsec, format_ethernet_vlan_tci, t->tph2.tp_vlan_tci +#ifdef TP_STATUS_VLAN_TPID_VALID + , + t->tph2.tp_vlan_tpid +#endif + ); + } + + s = format (s, + "\n%Uvnet-hdr:\n%Uflags 0x%02x gso_type 0x%02x hdr_len %u" + "\n%Ugso_size %u csum_start %u csum_offset %u", + format_white_space, indent + 2, format_white_space, indent + 4, + t->vnet_hdr.flags, t->vnet_hdr.gso_type, t->vnet_hdr.hdr_len, + format_white_space, indent + 4, t->vnet_hdr.gso_size, + t->vnet_hdr.csum_start, t->vnet_hdr.csum_offset); + return s; +} + +always_inline void +buffer_add_to_chain (vlib_buffer_t *b, vlib_buffer_t *first_b, + vlib_buffer_t *prev_b, u32 bi) +{ + /* update first buffer */ + first_b->total_length_not_including_first_buffer += b->current_length; + + /* update previous buffer */ + prev_b->next_buffer = bi; + prev_b->flags |= VLIB_BUFFER_NEXT_PRESENT; + + /* update current buffer */ + b->next_buffer = ~0; +} + +static_always_inline void +fill_gso_offload (vlib_buffer_t *b, u32 gso_size, u8 l4_hdr_sz) +{ + b->flags |= VNET_BUFFER_F_GSO; + vnet_buffer2 (b)->gso_size = gso_size; + vnet_buffer2 (b)->gso_l4_hdr_sz = l4_hdr_sz; +} + +static_always_inline void +fill_cksum_offload (vlib_buffer_t *b, u8 *l4_hdr_sz, u8 is_ip) +{ + vnet_buffer_oflags_t oflags = 0; + u16 l2hdr_sz = 0; + u16 ethertype = 0; + u8 l4_proto = 0; + + if (is_ip) + { + switch (b->data[0] & 0xf0) + { + case 0x40: + ethertype = ETHERNET_TYPE_IP4; + break; + case 0x60: + ethertype = ETHERNET_TYPE_IP6; + break; + } + } + else + { + ethernet_header_t *eth = (ethernet_header_t *) b->data; + ethertype = clib_net_to_host_u16 (eth->type); + l2hdr_sz = sizeof (ethernet_header_t); + if (ethernet_frame_is_tagged (ethertype)) + { + ethernet_vlan_header_t *vlan = (ethernet_vlan_header_t *) (eth + 1); + + ethertype = clib_net_to_host_u16 (vlan->type); + l2hdr_sz += sizeof (*vlan); + if (ethertype == ETHERNET_TYPE_VLAN) + { + vlan++; + ethertype = clib_net_to_host_u16 (vlan->type); + l2hdr_sz += sizeof (*vlan); + } + } + } + + vnet_buffer (b)->l2_hdr_offset = 0; + vnet_buffer (b)->l3_hdr_offset = l2hdr_sz; + + if (ethertype == ETHERNET_TYPE_IP4) + { + ip4_header_t *ip4 = (ip4_header_t *) (b->data + l2hdr_sz); + vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip4_header_bytes (ip4); + b->flags |= (VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID | + VNET_BUFFER_F_L3_HDR_OFFSET_VALID | + VNET_BUFFER_F_L4_HDR_OFFSET_VALID); + + l4_proto = ip4->protocol; + } + else if (ethertype == ETHERNET_TYPE_IP6) + { + ip6_header_t *ip6 = (ip6_header_t *) (b->data + l2hdr_sz); + b->flags |= (VNET_BUFFER_F_IS_IP6 | VNET_BUFFER_F_L2_HDR_OFFSET_VALID | + VNET_BUFFER_F_L3_HDR_OFFSET_VALID | + VNET_BUFFER_F_L4_HDR_OFFSET_VALID); + u16 ip6_hdr_len = sizeof (ip6_header_t); + + if (ip6_ext_hdr (ip6->protocol)) + { + ip6_ext_header_t *p = (void *) (ip6 + 1); + ip6_hdr_len += ip6_ext_header_len (p); + while (ip6_ext_hdr (p->next_hdr)) + { + ip6_hdr_len += ip6_ext_header_len (p); + p = ip6_ext_next_header (p); + } + l4_proto = p->next_hdr; + } + else + l4_proto = ip6->protocol; + vnet_buffer (b)->l4_hdr_offset = l2hdr_sz + ip6_hdr_len; + } + + if (l4_proto == IP_PROTOCOL_TCP) + { + oflags |= VNET_BUFFER_OFFLOAD_F_TCP_CKSUM; + tcp_header_t *tcp = + (tcp_header_t *) (b->data + vnet_buffer (b)->l4_hdr_offset); + *l4_hdr_sz = tcp_header_bytes (tcp); + } + else if (l4_proto == IP_PROTOCOL_UDP) + { + oflags |= VNET_BUFFER_OFFLOAD_F_UDP_CKSUM; + *l4_hdr_sz = sizeof (udp_header_t); + } + + if (oflags) + vnet_buffer_offload_flags_set (b, oflags); +} + +always_inline uword +af_packet_v3_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_frame_t *frame, af_packet_if_t *apif, + u16 queue_id, u8 is_cksum_gso_enabled) +{ + af_packet_main_t *apm = &af_packet_main; + af_packet_queue_t *rx_queue = vec_elt_at_index (apif->rx_queues, queue_id); + tpacket3_hdr_t *tph; + u32 next_index; + u32 n_free_bufs; + u32 n_rx_packets = 0; + u32 n_rx_bytes = 0; + u32 timedout_blk = 0; + u32 total = 0; + u32 *to_next = 0; + u32 block = rx_queue->next_rx_block; + u32 block_nr = rx_queue->rx_req->req3.tp_block_nr; + u8 *block_start = 0; + uword n_trace = vlib_get_trace_count (vm, node); + u32 thread_index = vm->thread_index; + u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm); + u32 min_bufs = rx_queue->rx_req->req3.tp_frame_size / n_buffer_bytes; + u32 num_pkts = 0; + u32 rx_frame_offset = 0; + block_desc_t *bd = 0; + vlib_buffer_t bt = {}; + u8 is_ip = (apif->mode == AF_PACKET_IF_MODE_IP); + + if (is_ip) + next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT; + else + { + next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + if (PREDICT_FALSE (apif->per_interface_next_index != ~0)) + next_index = apif->per_interface_next_index; + + /* redirect if feature path enabled */ + vnet_feature_start_device_input_x1 (apif->sw_if_index, &next_index, &bt); + } + + if ((((block_desc_t *) (block_start = rx_queue->rx_ring[block])) + ->hdr.bh1.block_status & + TP_STATUS_USER) != 0) + { + u32 n_required = 0; + bd = (block_desc_t *) block_start; + + if (PREDICT_FALSE (rx_queue->is_rx_pending)) + { + num_pkts = rx_queue->num_rx_pkts; + rx_frame_offset = rx_queue->rx_frame_offset; + rx_queue->is_rx_pending = 0; + } + else + { + num_pkts = bd->hdr.bh1.num_pkts; + rx_frame_offset = sizeof (block_desc_t); + total++; + + if (TP_STATUS_BLK_TMO & bd->hdr.bh1.block_status) + timedout_blk++; + } + + n_required = clib_max (num_pkts, VLIB_FRAME_SIZE); + n_free_bufs = vec_len (apm->rx_buffers[thread_index]); + if (PREDICT_FALSE (n_free_bufs < n_required)) + { + vec_validate (apm->rx_buffers[thread_index], + n_required + n_free_bufs - 1); + n_free_bufs += vlib_buffer_alloc ( + vm, &apm->rx_buffers[thread_index][n_free_bufs], n_required); + vec_set_len (apm->rx_buffers[thread_index], n_free_bufs); + } + + while (num_pkts && (n_free_bufs >= min_bufs)) + { + u32 next0 = next_index; + u32 n_left_to_next; + + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + + while (num_pkts && n_left_to_next && (n_free_bufs >= min_bufs)) + { + tph = (tpacket3_hdr_t *) (block_start + rx_frame_offset); + + if (num_pkts > 1) + CLIB_PREFETCH (block_start + rx_frame_offset + + tph->tp_next_offset, + 2 * CLIB_CACHE_LINE_BYTES, LOAD); + + vlib_buffer_t *b0 = 0, *first_b0 = 0, *prev_b0 = 0; + vnet_virtio_net_hdr_t *vnet_hdr = 0; + u32 data_len = tph->tp_snaplen; + u32 offset = 0; + u32 bi0 = ~0, first_bi0 = ~0; + u8 l4_hdr_sz = 0; + + if (is_cksum_gso_enabled) + vnet_hdr = + (vnet_virtio_net_hdr_t *) ((u8 *) tph + tph->tp_mac - + sizeof (vnet_virtio_net_hdr_t)); + + // save current state and return + if (PREDICT_FALSE (((data_len / n_buffer_bytes) + 1) > + vec_len (apm->rx_buffers[thread_index]))) + { + rx_queue->rx_frame_offset = rx_frame_offset; + rx_queue->num_rx_pkts = num_pkts; + rx_queue->is_rx_pending = 1; + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + goto done; + } + + while (data_len) + { + /* grab free buffer */ + u32 last_empty_buffer = + vec_len (apm->rx_buffers[thread_index]) - 1; + bi0 = apm->rx_buffers[thread_index][last_empty_buffer]; + vec_set_len (apm->rx_buffers[thread_index], + last_empty_buffer); + n_free_bufs--; + + /* copy data */ + u32 bytes_to_copy = + data_len > n_buffer_bytes ? n_buffer_bytes : data_len; + u32 vlan_len = 0; + u32 bytes_copied = 0; + + b0 = vlib_get_buffer (vm, bi0); + b0->current_data = 0; + + /* Kernel removes VLAN headers, so reconstruct VLAN */ + if (PREDICT_FALSE (tph->tp_status & TP_STATUS_VLAN_VALID)) + { + if (PREDICT_TRUE (offset == 0)) + { + clib_memcpy_fast (vlib_buffer_get_current (b0), + (u8 *) tph + tph->tp_mac, + sizeof (ethernet_header_t)); + ethernet_header_t *eth = + vlib_buffer_get_current (b0); + ethernet_vlan_header_t *vlan = + (ethernet_vlan_header_t *) (eth + 1); + vlan->priority_cfi_and_id = + clib_host_to_net_u16 (tph->hv1.tp_vlan_tci); + vlan->type = eth->type; + eth->type = + clib_host_to_net_u16 (ETHERNET_TYPE_VLAN); + vlan_len = sizeof (ethernet_vlan_header_t); + bytes_copied = sizeof (ethernet_header_t); + } + } + clib_memcpy_fast (((u8 *) vlib_buffer_get_current (b0)) + + bytes_copied + vlan_len, + (u8 *) tph + tph->tp_mac + offset + + bytes_copied, + (bytes_to_copy - bytes_copied)); + + /* fill buffer header */ + b0->current_length = bytes_to_copy + vlan_len; + + if (offset == 0) + { + b0->total_length_not_including_first_buffer = 0; + b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID; + vnet_buffer (b0)->sw_if_index[VLIB_RX] = + apif->sw_if_index; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~0; + first_b0 = b0; + first_bi0 = bi0; + if (is_cksum_gso_enabled) + { + if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) + fill_cksum_offload (first_b0, &l4_hdr_sz, is_ip); + if (vnet_hdr->gso_type & (VIRTIO_NET_HDR_GSO_TCPV4 | + VIRTIO_NET_HDR_GSO_TCPV6)) + fill_gso_offload (first_b0, vnet_hdr->gso_size, + l4_hdr_sz); + } + } + else + buffer_add_to_chain (b0, first_b0, prev_b0, bi0); + + prev_b0 = b0; + offset += bytes_to_copy; + data_len -= bytes_to_copy; + } + n_rx_packets++; + n_rx_bytes += tph->tp_snaplen; + to_next[0] = first_bi0; + to_next += 1; + n_left_to_next--; + + /* drop partial packets */ + if (PREDICT_FALSE (tph->tp_len != tph->tp_snaplen)) + { + next0 = VNET_DEVICE_INPUT_NEXT_DROP; + first_b0->error = + node->errors[AF_PACKET_INPUT_ERROR_PARTIAL_PKT]; + } + else + { + if (PREDICT_FALSE (apif->mode == AF_PACKET_IF_MODE_IP)) + { + switch (first_b0->data[0] & 0xf0) + { + case 0x40: + next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT; + break; + case 0x60: + next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT; + break; + default: + next0 = VNET_DEVICE_INPUT_NEXT_DROP; + break; + } + if (PREDICT_FALSE (apif->per_interface_next_index != ~0)) + next0 = apif->per_interface_next_index; + } + else + { + /* copy feature arc data from template */ + first_b0->current_config_index = bt.current_config_index; + vnet_buffer (first_b0)->feature_arc_index = + vnet_buffer (&bt)->feature_arc_index; + } + } + + /* trace */ + if (PREDICT_FALSE (n_trace > 0 && + vlib_trace_buffer (vm, node, next0, first_b0, + /* follow_chain */ 0))) + { + af_packet_input_trace_t *tr; + vlib_set_trace_count (vm, node, --n_trace); + tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr)); + tr->is_v3 = 1; + tr->next_index = next0; + tr->hw_if_index = apif->hw_if_index; + tr->queue_id = queue_id; + tr->block = block; + tr->block_start = bd; + tr->pkt_num = bd->hdr.bh1.num_pkts - num_pkts; + clib_memcpy_fast (&tr->bd, bd, sizeof (block_desc_t)); + clib_memcpy_fast (&tr->tph3, tph, sizeof (tpacket3_hdr_t)); + if (is_cksum_gso_enabled) + clib_memcpy_fast (&tr->vnet_hdr, vnet_hdr, + sizeof (vnet_virtio_net_hdr_t)); + else + clib_memset_u8 (&tr->vnet_hdr, 0, + sizeof (vnet_virtio_net_hdr_t)); + } + + /* enque and take next packet */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, first_bi0, + next0); + + /* next packet */ + num_pkts--; + rx_frame_offset += tph->tp_next_offset; + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + if (PREDICT_TRUE (num_pkts == 0)) + { + bd->hdr.bh1.block_status = TP_STATUS_KERNEL; + block = (block + 1) % block_nr; + } + else + { + rx_queue->rx_frame_offset = rx_frame_offset; + rx_queue->num_rx_pkts = num_pkts; + rx_queue->is_rx_pending = 1; + } + } + + rx_queue->next_rx_block = block; + +done: + + if (apm->polling_count == 0) + { + if ((((block_desc_t *) (block_start = rx_queue->rx_ring[block])) + ->hdr.bh1.block_status & + TP_STATUS_USER) != 0) + vlib_node_set_state (vm, node->node_index, VLIB_NODE_STATE_POLLING); + else + vlib_node_set_state (vm, node->node_index, VLIB_NODE_STATE_INTERRUPT); + } + + vlib_error_count (vm, node->node_index, AF_PACKET_INPUT_ERROR_TOTAL_RECV_BLK, + total); + vlib_error_count (vm, node->node_index, AF_PACKET_INPUT_ERROR_TIMEDOUT_BLK, + timedout_blk); + + vlib_increment_combined_counter + (vnet_get_main ()->interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + vlib_get_thread_index (), apif->hw_if_index, n_rx_packets, n_rx_bytes); + + vnet_device_increment_rx_packets (thread_index, n_rx_packets); + return n_rx_packets; +} + +always_inline uword +af_packet_v2_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_frame_t *frame, af_packet_if_t *apif, + u16 queue_id, u8 is_cksum_gso_enabled) +{ + af_packet_main_t *apm = &af_packet_main; + af_packet_queue_t *rx_queue = vec_elt_at_index (apif->rx_queues, queue_id); + tpacket2_hdr_t *tph; + u32 next_index; + u32 block = 0; + u32 rx_frame; + u32 n_free_bufs; + u32 n_rx_packets = 0; + u32 n_rx_bytes = 0; + u32 *to_next = 0; + u32 frame_size = rx_queue->rx_req->req.tp_frame_size; + u32 frame_num = rx_queue->rx_req->req.tp_frame_nr; + u8 *block_start = rx_queue->rx_ring[block]; + uword n_trace = vlib_get_trace_count (vm, node); + u32 thread_index = vm->thread_index; + u32 n_buffer_bytes = vlib_buffer_get_default_data_size (vm); + u32 min_bufs = rx_queue->rx_req->req.tp_frame_size / n_buffer_bytes; + u8 is_ip = (apif->mode == AF_PACKET_IF_MODE_IP); + vlib_buffer_t bt = {}; + + if (is_ip) + { + next_index = VNET_DEVICE_INPUT_NEXT_IP4_INPUT; + } + else + { + next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT; + if (PREDICT_FALSE (apif->per_interface_next_index != ~0)) + next_index = apif->per_interface_next_index; + + /* redirect if feature path enabled */ + vnet_feature_start_device_input_x1 (apif->sw_if_index, &next_index, &bt); + } + + n_free_bufs = vec_len (apm->rx_buffers[thread_index]); + if (PREDICT_FALSE (n_free_bufs < VLIB_FRAME_SIZE)) + { + vec_validate (apm->rx_buffers[thread_index], + VLIB_FRAME_SIZE + n_free_bufs - 1); + n_free_bufs += vlib_buffer_alloc ( + vm, &apm->rx_buffers[thread_index][n_free_bufs], VLIB_FRAME_SIZE); + vec_set_len (apm->rx_buffers[thread_index], n_free_bufs); + } + + rx_frame = rx_queue->next_rx_frame; + tph = (tpacket2_hdr_t *) (block_start + rx_frame * frame_size); + while ((tph->tp_status & TP_STATUS_USER) && (n_free_bufs > min_bufs)) + { + vlib_buffer_t *b0 = 0, *first_b0 = 0, *prev_b0 = 0; + u32 next0 = next_index; + + u32 n_left_to_next; + vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); + while ((tph->tp_status & TP_STATUS_USER) && (n_free_bufs > min_bufs) && + n_left_to_next) + { + vnet_virtio_net_hdr_t *vnet_hdr = 0; + u32 data_len = tph->tp_snaplen; + u32 offset = 0; + u32 bi0 = 0, first_bi0 = 0; + u8 l4_hdr_sz = 0; + + if (is_cksum_gso_enabled) + vnet_hdr = + (vnet_virtio_net_hdr_t *) ((u8 *) tph + tph->tp_mac - + sizeof (vnet_virtio_net_hdr_t)); + while (data_len) + { + /* grab free buffer */ + u32 last_empty_buffer = + vec_len (apm->rx_buffers[thread_index]) - 1; + bi0 = apm->rx_buffers[thread_index][last_empty_buffer]; + b0 = vlib_get_buffer (vm, bi0); + vec_set_len (apm->rx_buffers[thread_index], last_empty_buffer); + n_free_bufs--; + + /* copy data */ + u32 bytes_to_copy = + data_len > n_buffer_bytes ? n_buffer_bytes : data_len; + u32 vlan_len = 0; + u32 bytes_copied = 0; + b0->current_data = 0; + /* Kernel removes VLAN headers, so reconstruct VLAN */ + if (PREDICT_FALSE (tph->tp_status & TP_STATUS_VLAN_VALID)) + { + if (PREDICT_TRUE (offset == 0)) + { + clib_memcpy_fast (vlib_buffer_get_current (b0), + (u8 *) tph + tph->tp_mac, + sizeof (ethernet_header_t)); + ethernet_header_t *eth = vlib_buffer_get_current (b0); + ethernet_vlan_header_t *vlan = + (ethernet_vlan_header_t *) (eth + 1); + vlan->priority_cfi_and_id = + clib_host_to_net_u16 (tph->tp_vlan_tci); + vlan->type = eth->type; + eth->type = clib_host_to_net_u16 (ETHERNET_TYPE_VLAN); + vlan_len = sizeof (ethernet_vlan_header_t); + bytes_copied = sizeof (ethernet_header_t); + } + } + clib_memcpy_fast (((u8 *) vlib_buffer_get_current (b0)) + + bytes_copied + vlan_len, + (u8 *) tph + tph->tp_mac + offset + + bytes_copied, + (bytes_to_copy - bytes_copied)); + + /* fill buffer header */ + b0->current_length = bytes_to_copy + vlan_len; + + if (offset == 0) + { + b0->total_length_not_including_first_buffer = 0; + b0->flags = VLIB_BUFFER_TOTAL_LENGTH_VALID; + vnet_buffer (b0)->sw_if_index[VLIB_RX] = apif->sw_if_index; + vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~0; + first_bi0 = bi0; + first_b0 = vlib_get_buffer (vm, first_bi0); + + if (is_cksum_gso_enabled) + { + if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) + fill_cksum_offload (first_b0, &l4_hdr_sz, is_ip); + if (vnet_hdr->gso_type & (VIRTIO_NET_HDR_GSO_TCPV4 | + VIRTIO_NET_HDR_GSO_TCPV6)) + fill_gso_offload (first_b0, vnet_hdr->gso_size, + l4_hdr_sz); + } + } + else + buffer_add_to_chain (b0, first_b0, prev_b0, bi0); + + prev_b0 = b0; + offset += bytes_to_copy; + data_len -= bytes_to_copy; + } + n_rx_packets++; + n_rx_bytes += tph->tp_snaplen; + to_next[0] = first_bi0; + to_next += 1; + n_left_to_next--; + + /* drop partial packets */ + if (PREDICT_FALSE (tph->tp_len != tph->tp_snaplen)) + { + next0 = VNET_DEVICE_INPUT_NEXT_DROP; + first_b0->error = + node->errors[AF_PACKET_INPUT_ERROR_PARTIAL_PKT]; + } + else + { + if (PREDICT_FALSE (is_ip)) + { + switch (first_b0->data[0] & 0xf0) + { + case 0x40: + next0 = VNET_DEVICE_INPUT_NEXT_IP4_INPUT; + break; + case 0x60: + next0 = VNET_DEVICE_INPUT_NEXT_IP6_INPUT; + break; + default: + next0 = VNET_DEVICE_INPUT_NEXT_DROP; + break; + } + if (PREDICT_FALSE (apif->per_interface_next_index != ~0)) + next0 = apif->per_interface_next_index; + } + else + { + /* copy feature arc data from template */ + first_b0->current_config_index = bt.current_config_index; + vnet_buffer (first_b0)->feature_arc_index = + vnet_buffer (&bt)->feature_arc_index; + } + } + + /* trace */ + if (PREDICT_FALSE (n_trace > 0 && + vlib_trace_buffer (vm, node, next0, first_b0, + /* follow_chain */ 0))) + { + af_packet_input_trace_t *tr; + vlib_set_trace_count (vm, node, --n_trace); + tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr)); + tr->is_v3 = 0; + tr->next_index = next0; + tr->hw_if_index = apif->hw_if_index; + tr->queue_id = queue_id; + clib_memcpy_fast (&tr->tph2, tph, sizeof (struct tpacket2_hdr)); + if (is_cksum_gso_enabled) + clib_memcpy_fast (&tr->vnet_hdr, vnet_hdr, + sizeof (vnet_virtio_net_hdr_t)); + else + clib_memset_u8 (&tr->vnet_hdr, 0, + sizeof (vnet_virtio_net_hdr_t)); + } + + /* enque and take next packet */ + vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, + n_left_to_next, first_bi0, next0); + + /* next packet */ + tph->tp_status = TP_STATUS_KERNEL; + rx_frame = (rx_frame + 1) % frame_num; + tph = (struct tpacket2_hdr *) (block_start + rx_frame * frame_size); + } + + vlib_put_next_frame (vm, node, next_index, n_left_to_next); + } + + rx_queue->next_rx_frame = rx_frame; + + vlib_increment_combined_counter ( + vnet_get_main ()->interface_main.combined_sw_if_counters + + VNET_INTERFACE_COUNTER_RX, + vlib_get_thread_index (), apif->hw_if_index, n_rx_packets, n_rx_bytes); + + vnet_device_increment_rx_packets (thread_index, n_rx_packets); + return n_rx_packets; +} + +always_inline uword +af_packet_device_input_fn (vlib_main_t *vm, vlib_node_runtime_t *node, + vlib_frame_t *frame, af_packet_if_t *apif, + u16 queue_id, u8 is_cksum_gso_enabled) + +{ + if (apif->version == TPACKET_V3) + return af_packet_v3_device_input_fn (vm, node, frame, apif, queue_id, + is_cksum_gso_enabled); + else + return af_packet_v2_device_input_fn (vm, node, frame, apif, queue_id, + is_cksum_gso_enabled); +} + +VLIB_NODE_FN (af_packet_input_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * frame) +{ + u32 n_rx_packets = 0; + af_packet_main_t *apm = &af_packet_main; + vnet_hw_if_rxq_poll_vector_t *pv; + pv = vnet_hw_if_get_rxq_poll_vector (vm, node); + for (int i = 0; i < vec_len (pv); i++) + { + af_packet_if_t *apif; + apif = vec_elt_at_index (apm->interfaces, pv[i].dev_instance); + if (apif->is_admin_up) + { + if (apif->is_cksum_gso_enabled) + n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif, + pv[i].queue_id, 1); + else + n_rx_packets += af_packet_device_input_fn (vm, node, frame, apif, + pv[i].queue_id, 0); + } + } + return n_rx_packets; +} + +VLIB_REGISTER_NODE (af_packet_input_node) = { + .name = "af-packet-input", + .flags = VLIB_NODE_FLAG_TRACE_SUPPORTED, + .sibling_of = "device-input", + .format_trace = format_af_packet_input_trace, + .type = VLIB_NODE_TYPE_INPUT, + .state = VLIB_NODE_STATE_INTERRUPT, + .n_errors = AF_PACKET_INPUT_N_ERROR, + .error_strings = af_packet_input_error_strings, +}; + + +/* + * fd.io coding-style-patch-verification: ON + * + * Local Variables: + * eval: (c-set-style "gnu") + * End: + */ |