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>
21 #include <sys/ioctl.h>
24 #include <vlib/vlib.h>
25 #include <vlib/unix/unix.h>
26 #include <vnet/ip/ip.h>
27 #include <vnet/ethernet/ethernet.h>
29 #include <vnet/devices/af_packet/af_packet.h>
31 #define foreach_af_packet_tx_func_error \
32 _(FRAME_NOT_READY, "tx frame not ready") \
33 _(TXRING_EAGAIN, "tx sendto temporary failure") \
34 _(TXRING_FATAL, "tx sendto fatal failure") \
35 _(TXRING_OVERRUN, "tx ring overrun")
39 #define _(f,s) AF_PACKET_TX_ERROR_##f,
40 foreach_af_packet_tx_func_error
43 } af_packet_tx_func_error_t;
45 static char *af_packet_tx_func_error_strings[] = {
47 foreach_af_packet_tx_func_error
53 format_af_packet_device_name (u8 * s, va_list * args)
55 u32 i = va_arg (*args, u32);
56 af_packet_main_t *apm = &af_packet_main;
57 af_packet_if_t *apif = pool_elt_at_index (apm->interfaces, i);
59 s = format (s, "host-%s", apif->host_if_name);
64 format_af_packet_device (u8 * s, va_list * args)
66 s = format (s, "Linux PACKET socket interface");
71 format_af_packet_tx_trace (u8 * s, va_list * args)
73 s = format (s, "Unimplemented...");
78 af_packet_interface_tx (vlib_main_t * vm,
79 vlib_node_runtime_t * node, vlib_frame_t * frame)
81 af_packet_main_t *apm = &af_packet_main;
82 u32 *buffers = vlib_frame_args (frame);
83 u32 n_left = frame->n_vectors;
85 vnet_interface_output_runtime_t *rd = (void *) node->runtime_data;
86 af_packet_if_t *apif =
87 pool_elt_at_index (apm->interfaces, rd->dev_instance);
89 u32 block_size = apif->tx_req->tp_block_size;
90 u32 frame_size = apif->tx_req->tp_frame_size;
91 u32 frame_num = apif->tx_req->tp_frame_nr;
92 u8 *block_start = apif->tx_ring + block * block_size;
93 u32 tx_frame = apif->next_tx_frame;
94 struct tpacket2_hdr *tph;
95 u32 frame_not_ready = 0;
97 clib_spinlock_lock_if_init (&apif->lockp);
108 tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size);
111 (tph->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING)))
119 b0 = vlib_get_buffer (vm, bi);
120 len = b0->current_length;
121 clib_memcpy ((u8 *) tph +
122 TPACKET_ALIGN (sizeof (struct tpacket2_hdr)) + offset,
123 vlib_buffer_get_current (b0), len);
127 (b0->flags & VLIB_BUFFER_NEXT_PRESENT) ? b0->next_buffer : 0));
129 tph->tp_len = tph->tp_snaplen = offset;
130 tph->tp_status = TP_STATUS_SEND_REQUEST;
133 /* check if we've exhausted the ring */
134 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
137 tx_frame = (tx_frame + 1) % frame_num;
140 CLIB_MEMORY_BARRIER ();
142 if (PREDICT_TRUE (n_sent))
144 apif->next_tx_frame = tx_frame;
146 if (PREDICT_FALSE (sendto (apif->fd, NULL, 0,
147 MSG_DONTWAIT, NULL, 0) == -1))
149 /* Uh-oh, drop & move on, but count whether it was fatal or not.
150 * Note that we have no reliable way to properly determine the
151 * disposition of the packets we just enqueued for delivery.
153 vlib_error_count (vm, node->node_index,
154 unix_error_is_fatal (errno) ?
155 AF_PACKET_TX_ERROR_TXRING_FATAL :
156 AF_PACKET_TX_ERROR_TXRING_EAGAIN, n_sent);
160 clib_spinlock_unlock_if_init (&apif->lockp);
162 if (PREDICT_FALSE (frame_not_ready))
163 vlib_error_count (vm, node->node_index,
164 AF_PACKET_TX_ERROR_FRAME_NOT_READY, frame_not_ready);
166 if (PREDICT_FALSE (frame_not_ready + n_sent == frame_num))
167 vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_TXRING_OVERRUN,
170 vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
171 return frame->n_vectors;
175 af_packet_set_interface_next_node (vnet_main_t * vnm, u32 hw_if_index,
178 af_packet_main_t *apm = &af_packet_main;
179 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
180 af_packet_if_t *apif =
181 pool_elt_at_index (apm->interfaces, hw->dev_instance);
183 /* Shut off redirection */
184 if (node_index == ~0)
186 apif->per_interface_next_index = node_index;
190 apif->per_interface_next_index =
191 vlib_node_add_next (vlib_get_main (), af_packet_input_node.index,
196 af_packet_clear_hw_interface_counters (u32 instance)
198 /* Nothing for now */
201 static clib_error_t *
202 af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index,
205 af_packet_main_t *apm = &af_packet_main;
206 vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
207 af_packet_if_t *apif =
208 pool_elt_at_index (apm->interfaces, hw->dev_instance);
210 int rv, fd = socket (AF_UNIX, SOCK_DGRAM, 0);
213 /* if interface is a bridge ignore */
214 if (apif->host_if_index < 0)
215 return 0; /* no error */
217 /* use host_if_index in case host name has changed */
218 ifr.ifr_ifindex = apif->host_if_index;
219 if ((rv = ioctl (fd, SIOCGIFNAME, &ifr)) < 0)
221 clib_unix_warning ("af_packet_%s ioctl could not retrieve eth name",
225 apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
227 if ((rv = ioctl (fd, SIOCGIFFLAGS, &ifr)) < 0)
229 clib_unix_warning ("af_packet_%s error: %d",
230 apif->is_admin_up ? "up" : "down", rv);
233 if (apif->is_admin_up)
235 hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP;
236 ifr.ifr_flags |= IFF_UP;
241 ifr.ifr_flags &= ~IFF_UP;
244 if ((rv = ioctl (fd, SIOCSIFFLAGS, &ifr)) < 0)
246 clib_unix_warning ("af_packet_%s error: %d",
247 apif->is_admin_up ? "up" : "down", rv);
250 vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
254 return 0; /* no error */
257 static clib_error_t *
258 af_packet_subif_add_del_function (vnet_main_t * vnm,
260 struct vnet_sw_interface_t *st, int is_add)
262 /* Nothing for now */
267 VNET_DEVICE_CLASS (af_packet_device_class) = {
269 .tx_function = af_packet_interface_tx,
270 .format_device_name = format_af_packet_device_name,
271 .format_device = format_af_packet_device,
272 .format_tx_trace = format_af_packet_tx_trace,
273 .tx_function_n_errors = AF_PACKET_TX_N_ERROR,
274 .tx_function_error_strings = af_packet_tx_func_error_strings,
275 .rx_redirect_to_node = af_packet_set_interface_next_node,
276 .clear_counters = af_packet_clear_hw_interface_counters,
277 .admin_up_down_function = af_packet_interface_admin_up_down,
278 .subif_add_del_function = af_packet_subif_add_del_function,
281 VLIB_DEVICE_TX_FUNCTION_MULTIARCH (af_packet_device_class,
282 af_packet_interface_tx)
286 * fd.io coding-style-patch-verification: ON
289 * eval: (c-set-style "gnu")