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/*
*------------------------------------------------------------------
* 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.
*------------------------------------------------------------------
*/
#define _GNU_SOURCE
#include <stdint.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/uio.h> /* for iovec */
#include <netinet/in.h>
#include <vlib/vlib.h>
#include <vnet/ip/ip.h>
#include <vlib/unix/unix.h>
#include <vnet/ethernet/ethernet.h>
#if DPDK == 1
#include <vnet/devices/dpdk/dpdk.h>
#endif
#include "turbotap.h"
vnet_device_class_t turbotap_dev_class;
static u8 * format_turbotap_interface_name (u8 * s, va_list * args)
{
u32 i = va_arg (*args, u32);
u32 show_dev_instance = ~0;
turbotap_main_t * tr = &turbotap_main;
if (i < vec_len (tr->show_dev_instance_by_real_dev_instance))
show_dev_instance = tr->show_dev_instance_by_real_dev_instance[i];
if (show_dev_instance != ~0)
i = show_dev_instance;
s = format (s, "turbotap-%d", i);
return s;
}
static void turbotap_set_interface_next_node (vnet_main_t *vnm,
u32 hw_if_index,
u32 node_index)
{
turbotap_main_t *tr = &turbotap_main;
turbotap_interface_t *ti;
vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
ti = vec_elt_at_index (tr->turbotap_interfaces, hw->dev_instance);
/* Shut off redirection */
if (node_index == ~0)
{
ti->per_interface_next_index = node_index;
return;
}
ti->per_interface_next_index =
vlib_node_add_next (tr->vlib_main, turbotap_rx_node.index, node_index);
}
static_always_inline uword
turbotap_tx_iface(vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame,
turbotap_interface_t * ti)
{
u32 * buffers = vlib_frame_args (frame);
uword n_packets = frame->n_vectors;
vlib_buffer_t * b;
int i = 0;
vnet_sw_interface_t *si = vnet_get_sw_interface (vnet_get_main(), ti->sw_if_index);
if (PREDICT_FALSE(!(si->flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP))) {
//Drop if interface is down
vlib_buffer_free(vm, vlib_frame_vector_args(frame), frame->n_vectors);
return 0;
}
u32 n_tx = (n_packets > MAX_SEND)?MAX_SEND:n_packets;
u32 total_bytes = 0;
for (i = 0; i < n_tx; i++) {
struct iovec * iov;
b = vlib_get_buffer(vm, buffers[i]);
if (ti->tx_msg[i].msg_hdr.msg_iov)
_vec_len(ti->tx_msg[i].msg_hdr.msg_iov) = 0; //Reset vector
/* VLIB buffer chain -> Unix iovec(s). */
vec_add2 (ti->tx_msg[i].msg_hdr.msg_iov, iov, 1);
iov->iov_base = b->data + b->current_data;
iov->iov_len = b->current_length;
ti->tx_msg[i].msg_len = b->current_length;
if (PREDICT_FALSE (b->flags & VLIB_BUFFER_NEXT_PRESENT)) {
do {
b = vlib_get_buffer (vm, b->next_buffer);
vec_add2 (ti->tx_msg[i].msg_hdr.msg_iov, iov, 1);
iov->iov_base = b->data + b->current_data;
iov->iov_len = b->current_length;
ti->tx_msg[i].msg_len += b->current_length;
} while (b->flags & VLIB_BUFFER_NEXT_PRESENT);
}
ti->tx_msg[i].msg_hdr.msg_name = NULL;
ti->tx_msg[i].msg_hdr.msg_namelen = 0;
ti->tx_msg[i].msg_hdr.msg_iovlen = _vec_len(ti->tx_msg[i].msg_hdr.msg_iov);
ti->tx_msg[i].msg_hdr.msg_control = NULL;
ti->tx_msg[i].msg_hdr.msg_controllen = 0;
ti->tx_msg[i].msg_hdr.msg_flags = MSG_DONTWAIT;
total_bytes += ti->tx_msg[i].msg_len;
}
if (n_tx) {
int tx;
if ((tx = sendmmsg(ti->sock_fd, ti->tx_msg, n_tx, MSG_DONTWAIT)) < 1) {
vlib_increment_simple_counter
(vnet_main.interface_main.sw_if_counters
+ VNET_INTERFACE_COUNTER_TX_ERROR, os_get_cpu_number(),
ti->sw_if_index, n_tx);
} else {
vlib_increment_combined_counter(
vnet_main.interface_main.combined_sw_if_counters
+ VNET_INTERFACE_COUNTER_TX,
os_get_cpu_number(), ti->sw_if_index,
tx, total_bytes);
}
}
vlib_buffer_free(vm, vlib_frame_vector_args(frame), frame->n_vectors);
return n_packets;
}
/*
* turbotap_tx
* Output node, writes the buffers comprising the incoming frame
* to the tun/tap device, aka hands them to the Linux kernel stack.
*
*/
static uword
turbotap_tx (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
u32 * buffers = vlib_frame_args (frame);
turbotap_main_t * tr = &turbotap_main;
turbotap_interface_t * ti;
if (!frame->n_vectors)
return 0;
vlib_buffer_t *b = vlib_get_buffer(vm, buffers[0]);
u32 tx_sw_if_index = vnet_buffer(b)->sw_if_index[VLIB_TX];
if (tx_sw_if_index == (u32)~0)
tx_sw_if_index = vnet_buffer(b)->sw_if_index[VLIB_RX];
ASSERT(tx_sw_if_index != (u32)~0);
/* Use the sup intfc to finesse vlan subifs */
vnet_hw_interface_t *hw = vnet_get_sup_hw_interface (tr->vnet_main, tx_sw_if_index);
tx_sw_if_index = hw->sw_if_index;
uword * p = hash_get (tr->turbotap_interface_index_by_sw_if_index,
tx_sw_if_index);
if (p == 0) {
clib_warning ("sw_if_index %d unknown", tx_sw_if_index);
return 0;
} else {
ti = vec_elt_at_index (tr->turbotap_interfaces, p[0]);
}
return turbotap_tx_iface(vm, node, frame, ti);
}
VLIB_REGISTER_NODE (turbotap_tx_node,static) = {
.function = turbotap_tx,
.name = "turbotap-tx",
.type = VLIB_NODE_TYPE_INTERNAL,
.vector_size = 4,
};
/*
* Mainly exists to set link_state == admin_state
* otherwise, e.g. ip6 neighbor discovery breaks
*/
static clib_error_t *
turbotap_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
uword is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
u32 hw_flags;
u32 speed_duplex = VNET_HW_INTERFACE_FLAG_FULL_DUPLEX
| VNET_HW_INTERFACE_FLAG_SPEED_40G;
if (is_admin_up)
hw_flags = VNET_HW_INTERFACE_FLAG_LINK_UP | speed_duplex;
else
hw_flags = speed_duplex;
vnet_hw_interface_set_flags (vnm, hw_if_index, hw_flags);
return 0;
}
VNET_DEVICE_CLASS (turbotap_dev_class) = {
.name = "turbotap",
.tx_function = turbotap_tx,
.format_device_name = format_turbotap_interface_name,
.rx_redirect_to_node = turbotap_set_interface_next_node,
.admin_up_down_function = turbotap_interface_admin_up_down,
.no_flatten_output_chains = 1,
};
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