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authorMohsin Kazmi <sykazmi@cisco.com>2022-12-14 13:10:29 +0000
committerDave Wallace <dwallacelf@gmail.com>2022-12-21 18:33:51 +0000
commitbca76580b17bbb6227f48b9ea4a5858802656962 (patch)
treeba8df625df7a4de1ea5fd970493d7cda74deedb7 /src/plugins/af_packet/node.c
parentbb98aac4223f506ec18109f9836daa6ef0d61180 (diff)
af_packet: move to plugin
Type: improvement Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com> Change-Id: I3ec857adb3a9e8a778072a202a4d23f4101e83b2
Diffstat (limited to 'src/plugins/af_packet/node.c')
-rw-r--r--src/plugins/af_packet/node.c845
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:
+ */