+++ /dev/null
-/*
- *------------------------------------------------------------------
- * 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 <vnet/devices/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:
- */
Code Review / vpp.git / blobdiff