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-rw-r--r--src/vnet/devices/af_packet/node.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/src/vnet/devices/af_packet/node.c b/src/vnet/devices/af_packet/node.c
new file mode 100644
index 00000000000..72004320c67
--- /dev/null
+++ b/src/vnet/devices/af_packet/node.c
@@ -0,0 +1,288 @@
+/*
+ *------------------------------------------------------------------
+ * 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/devices/devices.h>
+#include <vnet/feature/feature.h>
+
+#include <vnet/devices/af_packet/af_packet.h>
+
+#define foreach_af_packet_input_error
+
+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;
+ int block;
+ struct tpacket2_hdr tph;
+} 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 *);
+ uword indent = format_get_indent (s);
+
+ s = format (s, "af_packet: hw_if_index %d next-index %d",
+ t->hw_if_index, t->next_index);
+
+ 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->tph.tp_status,
+ t->tph.tp_len,
+ t->tph.tp_snaplen,
+ t->tph.tp_mac,
+ t->tph.tp_net,
+ format_white_space, indent + 4,
+ t->tph.tp_sec,
+ t->tph.tp_nsec, format_ethernet_vlan_tci, t->tph.tp_vlan_tci
+#ifdef TP_STATUS_VLAN_TPID_VALID
+ , t->tph.tp_vlan_tpid
+#endif
+ );
+ return s;
+}
+
+always_inline void
+buffer_add_to_chain (vlib_main_t * vm, u32 bi, u32 first_bi, u32 prev_bi)
+{
+ vlib_buffer_t *b = vlib_get_buffer (vm, bi);
+ vlib_buffer_t *first_b = vlib_get_buffer (vm, first_bi);
+ vlib_buffer_t *prev_b = vlib_get_buffer (vm, prev_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;
+}
+
+always_inline uword
+af_packet_device_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame, u32 device_idx)
+{
+ af_packet_main_t *apm = &af_packet_main;
+ af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, device_idx);
+ struct tpacket2_hdr *tph;
+ u32 next_index = VNET_DEVICE_INPUT_NEXT_ETHERNET_INPUT;
+ 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 block_size = apif->rx_req->tp_block_size;
+ u32 frame_size = apif->rx_req->tp_frame_size;
+ u32 frame_num = apif->rx_req->tp_frame_nr;
+ u8 *block_start = apif->rx_ring + block * block_size;
+ uword n_trace = vlib_get_trace_count (vm, node);
+ u32 n_buffer_bytes = vlib_buffer_free_list_buffer_size (vm,
+ VLIB_BUFFER_DEFAULT_FREE_LIST_INDEX);
+ u32 min_bufs = apif->rx_req->tp_frame_size / n_buffer_bytes;
+ int cpu_index = node->cpu_index;
+
+ if (apif->per_interface_next_index != ~0)
+ next_index = apif->per_interface_next_index;
+
+ n_free_bufs = vec_len (apm->rx_buffers[cpu_index]);
+ if (PREDICT_FALSE (n_free_bufs < VLIB_FRAME_SIZE))
+ {
+ vec_validate (apm->rx_buffers[cpu_index],
+ VLIB_FRAME_SIZE + n_free_bufs - 1);
+ n_free_bufs +=
+ vlib_buffer_alloc (vm, &apm->rx_buffers[cpu_index][n_free_bufs],
+ VLIB_FRAME_SIZE);
+ _vec_len (apm->rx_buffers[cpu_index]) = n_free_bufs;
+ }
+
+ rx_frame = apif->next_rx_frame;
+ tph = (struct tpacket2_hdr *) (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;
+ 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)
+ {
+ u32 data_len = tph->tp_snaplen;
+ u32 offset = 0;
+ u32 bi0 = 0, first_bi0 = 0, prev_bi0;
+
+ while (data_len)
+ {
+ /* grab free buffer */
+ u32 last_empty_buffer =
+ vec_len (apm->rx_buffers[cpu_index]) - 1;
+ prev_bi0 = bi0;
+ bi0 = apm->rx_buffers[cpu_index][last_empty_buffer];
+ b0 = vlib_get_buffer (vm, bi0);
+ _vec_len (apm->rx_buffers[cpu_index]) = last_empty_buffer;
+ n_free_bufs--;
+
+ /* copy data */
+ u32 bytes_to_copy =
+ data_len > n_buffer_bytes ? n_buffer_bytes : data_len;
+ b0->current_data = 0;
+ clib_memcpy (vlib_buffer_get_current (b0),
+ (u8 *) tph + tph->tp_mac + offset, bytes_to_copy);
+
+ /* fill buffer header */
+ b0->current_length = bytes_to_copy;
+
+ 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);
+ }
+ else
+ buffer_add_to_chain (vm, bi0, first_bi0, prev_bi0);
+
+ 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--;
+
+ /* trace */
+ VLIB_BUFFER_TRACE_TRAJECTORY_INIT (first_b0);
+ if (PREDICT_FALSE (n_trace > 0))
+ {
+ af_packet_input_trace_t *tr;
+ vlib_trace_buffer (vm, node, next0, first_b0, /* follow_chain */
+ 0);
+ vlib_set_trace_count (vm, node, --n_trace);
+ tr = vlib_add_trace (vm, node, first_b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->hw_if_index = apif->hw_if_index;
+ clib_memcpy (&tr->tph, tph, sizeof (struct tpacket2_hdr));
+ }
+
+ /* redirect if feature path enabled */
+ vnet_feature_start_device_input_x1 (apif->sw_if_index, &next0, b0,
+ 0);
+
+ /* 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);
+ }
+
+ apif->next_rx_frame = rx_frame;
+
+ vlib_increment_combined_counter
+ (vnet_get_main ()->interface_main.combined_sw_if_counters
+ + VNET_INTERFACE_COUNTER_RX,
+ os_get_cpu_number (), apif->hw_if_index, n_rx_packets, n_rx_bytes);
+
+ return n_rx_packets;
+}
+
+static uword
+af_packet_input_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ int i;
+ u32 n_rx_packets = 0;
+
+ af_packet_main_t *apm = &af_packet_main;
+
+ /* *INDENT-OFF* */
+ clib_bitmap_foreach (i, apm->pending_input_bitmap,
+ ({
+ clib_bitmap_set (apm->pending_input_bitmap, i, 0);
+ n_rx_packets += af_packet_device_input_fn(vm, node, frame, i);
+ }));
+ /* *INDENT-ON* */
+
+ return n_rx_packets;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (af_packet_input_node) = {
+ .function = af_packet_input_fn,
+ .name = "af-packet-input",
+ .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,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (af_packet_input_node, af_packet_input_fn)
+/* *INDENT-ON* */
+
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */