2 *------------------------------------------------------------------
3 * af_packet.c - linux kernel packet interface
5 * Copyright (c) 2016 Cisco and/or its affiliates.
6 * Licensed under the Apache License, Version 2.0 (the "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at:
10 * http://www.apache.org/licenses/LICENSE-2.0
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 *------------------------------------------------------------------
20 #include <linux/if_packet.h>
22 #include <vlib/vlib.h>
23 #include <vlib/unix/unix.h>
24 #include <vnet/ip/ip.h>
25 #include <vnet/ethernet/ethernet.h>
27 #include <vnet/devices/af_packet/af_packet.h>
29 #define foreach_af_packet_tx_func_error \
30 _(FRAME_NOT_READY, "tx frame not ready") \
31 _(TXRING_EAGAIN, "tx sendto temporary failure") \
32 _(TXRING_FATAL, "tx sendto fatal failure") \
33 _(TXRING_OVERRUN, "tx ring overrun")
37 #define _(f,s) AF_PACKET_TX_ERROR_##f,
38 foreach_af_packet_tx_func_error
41 } af_packet_tx_func_error_t;
43 static char *af_packet_tx_func_error_strings[] = {
45 foreach_af_packet_tx_func_error
51 format_af_packet_device_name (u8 * s, va_list * args)
53 u32 i = va_arg (*args, u32);
54 af_packet_main_t *apm = &af_packet_main;
55 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, i);
57 s = format (s, "host-%s", apif->host_if_name);
62 format_af_packet_device (u8 * s, va_list * args)
64 s = format (s, "Linux PACKET socket interface");
69 format_af_packet_tx_trace (u8 * s, va_list * args)
71 s = format (s, "Unimplemented...");
76 af_packet_interface_tx (vlib_main_t * vm,
77 vlib_node_runtime_t * node, vlib_frame_t * frame)
79 af_packet_main_t *apm = &af_packet_main;
80 u32 *buffers = vlib_frame_args (frame);
81 u32 n_left = frame->n_vectors;
83 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
84 af_packet_if_t *apif =
85 pool_elt_at_index (apm->interfaces, rd->dev_instance);
87 u32 block_size = apif->tx_req->tp_block_size;
88 u32 frame_size = apif->tx_req->tp_frame_size;
89 u32 frame_num = apif->tx_req->tp_frame_nr;
90 u8 *block_start = apif->tx_ring + block * block_size;
91 u32 tx_frame = apif->next_tx_frame;
92 struct tpacket2_hdr *tph;
93 u32 frame_not_ready = 0;
95 clib_spinlock_lock_if_init (&apif->lockp);
106 tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size);
109 (tph->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING)))
117 b0 = vlib_get_buffer (vm, bi);
118 len = b0->current_length;
119 clib_memcpy ((u8 *) tph +
120 TPACKET_ALIGN (sizeof (struct tpacket2_hdr)) + offset,
121 vlib_buffer_get_current (b0), len);
125 (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
127 tph->tp_len = tph->tp_snaplen = offset;
128 tph->tp_status = TP_STATUS_SEND_REQUEST;
131 /* check if we've exhausted the ring */
132 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
135 tx_frame = (tx_frame + 1) % frame_num;
138 CLIB_MEMORY_BARRIER ();
140 if (PREDICT_TRUE (n_sent))
142 apif->next_tx_frame = tx_frame;
144 if (PREDICT_FALSE (sendto (apif->fd, NULL, 0,
145 MSG_DONTWAIT, NULL, 0) == -1))
147 /* Uh-oh, drop & move on, but count whether it was fatal or not.
148 * Note that we have no reliable way to properly determine the
149 * disposition of the packets we just enqueued for delivery.
151 vlib_error_count (vm, node->node_index,
152 unix_error_is_fatal (errno) ?
153 AF_PACKET_TX_ERROR_TXRING_FATAL :
154 AF_PACKET_TX_ERROR_TXRING_EAGAIN, n_sent);
158 clib_spinlock_unlock_if_init (&apif->lockp);
160 if (PREDICT_FALSE (frame_not_ready))
161 vlib_error_count (vm, node->node_index,
162 AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready);
164 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
165 vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN,
168 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
169 return frame->n_vectors;
173 af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
176 af_packet_main_t *apm = &af_packet_main;
177 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
178 af_packet_if_t *apif =
179 pool_elt_at_index (apm->interfaces, hw->dev_instance);
181 /* Shut off redirection */
182 if (node_index == ~0)
184 apif->per_interface_next_index = node_index;
188 apif->per_interface_next_index =
189 vlib_node_add_next (vlib_get_main (), af_packet_input_node.index,
194 af_packet_clear_hw_interface_counters (u32 instance)
196 /* Nothing for now */
199 static clib_error_t *
200 af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
203 af_packet_main_t *apm = &af_packet_main;
204 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
205 af_packet_if_t *apif =
206 pool_elt_at_index (apm->interfaces, hw->dev_instance);
209 apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
211 if (apif->is_admin_up)
212 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP;
216 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
221 static clib_error_t *
222 af_packet_subif_add_del_function (vnet_main_t * vnm,
224 struct vnet_sw_interface_t *st, int is_add)
226 /* Nothing for now */
231 VNET_DEVICE_CLASS (af_packet_device_class) = {
233 .tx_function = af_packet_interface_tx,
234 .format_device_name = format_af_packet_device_name,
235 .format_device = format_af_packet_device,
236 .format_tx_trace = format_af_packet_tx_trace,
237 .tx_function_n_errors = AF_PACKET_TX_N_ERROR,
238 .tx_function_error_strings = af_packet_tx_func_error_strings,
239 .rx_redirect_to_node = af_packet_set_interface_next_node,
240 .clear_counters = af_packet_clear_hw_interface_counters,
241 .admin_up_down_function = af_packet_interface_admin_up_down,
242 .subif_add_del_function = af_packet_subif_add_del_function,
245 VLIB_DEVICE_TX_FUNCTION_MULTIARCH (af_packet_device_class,
246 af_packet_interface_tx)
250 * fd.io coding-style-patch-verification: ON
253 * eval: (c-set-style "gnu")