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Add vpp native linux kernel AF_PACKET interface support

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This is 1st drop of VPP native driver for linux AF_PACKET.

New CLI:

  create host-interface name <host-if-name>  [hw-addr <mac-address>]

References:
 - Documentation/networking/packet_mmap.txt in the Linux kernel tree
 - man 7 packet

Known issues:
 - attaching to linux bridge doesn't work
 - it is not expected to work in multicore setup

Change-Id: I1cb1c3d305f349759e90e76e25696718b73bd73d
Signed-off-by: Damjan Marion <damarion@cisco.com>
This commit is contained in:
Damjan Marion
2016-02-29 13:09:30 +01:00
parent b8abf877ba
commit 83243a0ff5
9 changed files with 920 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
vlib/vlib/unix/input.c
View File

@ -72,6 +72,8 @@ linux_epoll_file_update (unix_file_t * f,
e.events = EPOLLIN;
if (f->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE)
e.events |= EPOLLOUT;
if (f->flags & UNIX_FILE_EVENT_EDGE_TRIGGERED)
e.events |= EPOLLET;
e.data.u32 = f - um->file_pool;
if (epoll_ctl (em->epoll_fd,

1
vlib/vlib/unix/unix.h
View File

@ -51,6 +51,7 @@ typedef struct unix_file {
u32 flags;
#define UNIX_FILE_DATA_AVAILABLE_TO_WRITE (1 << 0)
#define UNIX_FILE_EVENT_EDGE_TRIGGERED (1 << 1)
/* Data available for function's use. */
uword private_data;

13
vnet/Makefile.am
View File

@ -606,6 +606,19 @@ libvnet_la_SOURCES += \
nobase_include_HEADERS += \
vnet/devices/ssvm/ssvm_eth.h
########################################
# Linux packet interface
########################################
libvnet_la_SOURCES += \
vnet/devices/af_packet/af_packet.c \
vnet/devices/af_packet/device.c \
vnet/devices/af_packet/node.c \
vnet/devices/af_packet/cli.c
nobase_include_HEADERS += \
vnet/devices/af_packet/af_packet.h
########################################
# Unix kernel related
########################################

3
vnet/vnet/api_errno.h
View File

@ -68,7 +68,8 @@ _(UNEXPECTED_INTF_STATE, -74, "Unexpected interface state") \
_(TUNNEL_EXIST, -75, "Tunnel already exists") \
_(INVALID_DECAP_NEXT, -76, "Invalid decap-next") \
_(RESPONSE_NOT_READY, -77, "Response not ready") \
_(NOT_CONNECTED, -78, "Not connected to the data plane")
_(NOT_CONNECTED, -78, "Not connected to the data plane") \
_(IF_ALREADY_EXISTS, -79, "Interface already exists")
typedef enum {
#define _(a,b,c) VNET_API_ERROR_##a = (b),

279
vnet/vnet/devices/af_packet/af_packet.c Normal file
View File

@ -0,0 +1,279 @@
/*
*------------------------------------------------------------------
* 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_ether.h>
#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/af_packet/af_packet.h>
#define AF_PACKET_DEBUG_SOCKET 0
#define AF_PACKET_TX_FRAMES_PER_BLOCK 1024
#define AF_PACKET_TX_FRAME_SIZE (2048 * 5)
#define AF_PACKET_TX_BLOCK_NR 1
#define AF_PACKET_TX_FRAME_NR (AF_PACKET_TX_BLOCK_NR * \
AF_PACKET_TX_FRAMES_PER_BLOCK)
#define AF_PACKET_TX_BLOCK_SIZE (AF_PACKET_TX_FRAME_SIZE * \
AF_PACKET_TX_FRAMES_PER_BLOCK)
#define AF_PACKET_RX_FRAMES_PER_BLOCK 1024
#define AF_PACKET_RX_FRAME_SIZE (2048 * 5)
#define AF_PACKET_RX_BLOCK_NR 1
#define AF_PACKET_RX_FRAME_NR (AF_PACKET_RX_BLOCK_NR * \
AF_PACKET_RX_FRAMES_PER_BLOCK)
#define AF_PACKET_RX_BLOCK_SIZE (AF_PACKET_RX_FRAME_SIZE * \
AF_PACKET_RX_FRAMES_PER_BLOCK)
#if AF_PACKET_DEBUG_SOCKET == 1
#define DBG_SOCK(args...) clib_warning(args);
#else
#define DBG_SOCK(args...)
#endif
/*defined in net/if.h but clashes with dpdk headers */
unsigned int if_nametoindex(const char *ifname);
typedef struct tpacket_req tpacket_req_t;
static u32
af_packet_eth_flag_change (vnet_main_t * vnm, vnet_hw_interface_t * hi, u32 flags)
{
/* nothing for now */
return 0;
}
static clib_error_t * af_packet_fd_read_ready (unix_file_t * uf)
{
vlib_main_t * vm = vlib_get_main();
af_packet_main_t * apm = &af_packet_main;
u32 idx = uf->private_data;
apm->pending_input_bitmap = clib_bitmap_set (apm->pending_input_bitmap, idx, 1);
/* Schedule the rx node */
vlib_node_set_interrupt_pending (vm, af_packet_input_node.index);
return 0;
}
static int
create_packet_v2_sock(u8 * name, tpacket_req_t * rx_req, tpacket_req_t * tx_req,
int *fd, u8 ** ring)
{
int ret, err;
struct sockaddr_ll sll;
uint host_if_index;
int ver = TPACKET_V2;
socklen_t req_sz = sizeof(struct tpacket_req);
u32 ring_sz = rx_req->tp_block_size * rx_req->tp_block_nr +
tx_req->tp_block_size * tx_req->tp_block_nr;
host_if_index = if_nametoindex((const char *) name);
if (!host_if_index)
{
DBG_SOCK("Wrong host interface name");
ret = VNET_API_ERROR_INVALID_INTERFACE;
goto error;
}
if ((*fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL))) < 0)
{
DBG_SOCK("Failed to create socket");
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
if ((err = setsockopt(*fd, SOL_PACKET, PACKET_VERSION, &ver, sizeof(ver))) < 0)
{
DBG_SOCK("Failed to set rx packet interface version");
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
int opt = 1;
if ((err = setsockopt(*fd, SOL_PACKET, PACKET_LOSS, &opt, sizeof(opt))) < 0)
{
DBG_SOCK("Failed to set rx packet interface version");
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
if ((err = setsockopt(*fd, SOL_PACKET, PACKET_RX_RING, rx_req, req_sz)) < 0)
{
DBG_SOCK("Failed to set packet rx ring options");
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
if ((err = setsockopt(*fd, SOL_PACKET, PACKET_TX_RING, tx_req, req_sz)) < 0)
{
DBG_SOCK("Failed to set packet rx ring options");
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
*ring = mmap(NULL, ring_sz, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_LOCKED, *fd, 0);
if (*ring == MAP_FAILED)
{
DBG_SOCK("mmap failure");
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
memset(&sll, 0, sizeof(sll));
sll.sll_family = PF_PACKET;
sll.sll_protocol = htons(ETH_P_ALL);
sll.sll_ifindex = host_if_index;
if ((err = bind(*fd, (struct sockaddr *) &sll, sizeof(sll))) < 0)
{
DBG_SOCK("Failed to bind rx packet socket (error %d)", err);
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
return 0;
error:
close(*fd);
return ret;
}
int
af_packet_create_if(vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set)
{
af_packet_main_t * apm = &af_packet_main;
int ret, fd = -1;
struct tpacket_req * rx_req = 0;
struct tpacket_req * tx_req = 0;
u8 * ring = 0;
af_packet_if_t * apif = 0;
u8 hw_addr[6];
clib_error_t * error;
vnet_sw_interface_t * sw;
vnet_main_t *vnm = vnet_get_main();
uword * p;
uword if_index;
p = mhash_get (&apm->if_index_by_host_if_name, host_if_name);
if (p)
{
return VNET_API_ERROR_SUBIF_ALREADY_EXISTS;
}
vec_validate(rx_req, 0);
rx_req->tp_block_size = AF_PACKET_RX_BLOCK_SIZE;
rx_req->tp_frame_size = AF_PACKET_RX_FRAME_SIZE;
rx_req->tp_block_nr = AF_PACKET_RX_BLOCK_NR;
rx_req->tp_frame_nr = AF_PACKET_RX_FRAME_NR;
vec_validate(tx_req, 0);
tx_req->tp_block_size = AF_PACKET_TX_BLOCK_SIZE;
tx_req->tp_frame_size = AF_PACKET_TX_FRAME_SIZE;
tx_req->tp_block_nr = AF_PACKET_TX_BLOCK_NR;
tx_req->tp_frame_nr = AF_PACKET_TX_FRAME_NR;
ret = create_packet_v2_sock(host_if_name, rx_req, tx_req, &fd, &ring);
if (ret != 0)
goto error;
/* So far everything looks good, let's create interface */
vec_add2 (apm->interfaces, apif, 1);
if_index = apif - apm->interfaces;
apif->fd = fd;
apif->rx_ring = ring;
apif->tx_ring = ring + rx_req->tp_block_size * rx_req->tp_block_nr;
apif->rx_req = rx_req;
apif->tx_req = tx_req;
apif->host_if_name = host_if_name;
{
unix_file_t template = {0};
template.read_function = af_packet_fd_read_ready;
template.file_descriptor = fd;
template.private_data = if_index;
template.flags = UNIX_FILE_EVENT_EDGE_TRIGGERED;
apif->unix_file_index = unix_file_add (&unix_main, &template);
}
/*use configured or generate random MAC address */
if (hw_addr_set)
memcpy(hw_addr, hw_addr_set, 6);
else
{
f64 now = vlib_time_now(vm);
u32 rnd;
rnd = (u32) (now * 1e6);
rnd = random_u32 (&rnd);
memcpy (hw_addr+2, &rnd, sizeof(rnd));
hw_addr[0] = 2;
hw_addr[1] = 0xfe;
}
error = ethernet_register_interface(vnm, af_packet_device_class.index,
if_index, hw_addr, &apif->hw_if_index,
af_packet_eth_flag_change);
if (error)
{
memset(apif, 0, sizeof(*apif));
_vec_len(apm->interfaces) -= 1;
clib_error_report (error);
ret = VNET_API_ERROR_SYSCALL_ERROR_1;
goto error;
}
sw = vnet_get_hw_sw_interface (vnm, apif->hw_if_index);
apif->sw_if_index = sw->sw_if_index;
vnet_hw_interface_set_flags (vnm, apif->hw_if_index,
VNET_HW_INTERFACE_FLAG_LINK_UP);
mhash_set_mem (&apm->if_index_by_host_if_name, host_if_name, &if_index, 0);
return 0;
error:
vec_free(host_if_name);
vec_free(rx_req);
vec_free(tx_req);
return ret;
}
static clib_error_t *
af_packet_init (vlib_main_t * vm)
{
af_packet_main_t * apm = &af_packet_main;
memset (apm, 0, sizeof (af_packet_main_t));
mhash_init_vec_string (&apm->if_index_by_host_if_name, sizeof (uword));
return 0;
}
VLIB_INIT_FUNCTION (af_packet_init);

57
vnet/vnet/devices/af_packet/af_packet.h Normal file
View File

@ -0,0 +1,57 @@
/*
*------------------------------------------------------------------
* af_packet.h - linux kernel packet interface header file
*
* 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.
*------------------------------------------------------------------
*/
typedef struct {
CLIB_CACHE_LINE_ALIGN_MARK(cacheline0);
u8 * host_if_name;
int fd;
struct tpacket_req * rx_req;
struct tpacket_req * tx_req;
u8 * rx_ring;
u8 * tx_ring;
u32 hw_if_index;
u32 sw_if_index;
u32 unix_file_index;
u32 next_rx_frame;
u32 next_tx_frame;
u32 per_interface_next_index;
u8 is_admin_up;
} af_packet_if_t;
typedef struct {
CLIB_CACHE_LINE_ALIGN_MARK(cacheline0);
af_packet_if_t * interfaces;
/* bitmap of pending rx interfaces */
uword * pending_input_bitmap;
/* rx buffer cache */
u32 * rx_buffers;
/* hash of host interface names */
mhash_t if_index_by_host_if_name;
} af_packet_main_t;
af_packet_main_t af_packet_main;
extern vnet_device_class_t af_packet_device_class;
extern vlib_node_registration_t af_packet_input_node;
int af_packet_create_if(vlib_main_t * vm, u8 * host_if_name, u8 * hw_addr_set);

89
vnet/vnet/devices/af_packet/cli.c Normal file
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@ -0,0 +1,89 @@
/*
*------------------------------------------------------------------
* 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 <fcntl.h> /* for open */
#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 <vlib/unix/unix.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/devices/af_packet/af_packet.h>
static clib_error_t *
af_packet_create_command_fn (vlib_main_t * vm, unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, * line_input = &_line_input;
u8 * host_if_name = NULL;
u8 hwaddr [6];
u8 * hw_addr_ptr = 0;
int r;
/* Get a line of input. */
if (! unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "name %s", &host_if_name))
;
else if (unformat (line_input, "hw-addr %U", unformat_ethernet_address, hwaddr))
hw_addr_ptr = hwaddr;
else
return clib_error_return (0, "unknown input `%U'", format_unformat_error, input);
}
unformat_free (line_input);
if (host_if_name == NULL)
return clib_error_return (0, "missing host interface name");
r = af_packet_create_if(vm, host_if_name, hw_addr_ptr);
if (r == VNET_API_ERROR_SYSCALL_ERROR_1)
return clib_error_return(0, "%s (errno %d)", strerror (errno), errno);
if (r == VNET_API_ERROR_INVALID_INTERFACE)
return clib_error_return(0, "Invalid interface name");
if (r == VNET_API_ERROR_SUBIF_ALREADY_EXISTS)
return clib_error_return(0, "Interface elready exists");
return 0;
}
VLIB_CLI_COMMAND (af_packet_create_command, static) = {
.path = "create host-interface",
.short_help = "create host-interface name <interface name> [hw-addr <mac>]",
.function = af_packet_create_command_fn,
};
clib_error_t *
af_packet_cli_init (vlib_main_t * vm)
{
return 0;
}
VLIB_INIT_FUNCTION (af_packet_cli_init);

198
vnet/vnet/devices/af_packet/device.c Normal file
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@ -0,0 +1,198 @@
/*
*------------------------------------------------------------------
* 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/af_packet/af_packet.h>
#define foreach_af_packet_tx_func_error \
_(FRAME_NOT_READY, "tx frame not ready")
typedef enum {
#define _(f,s) AF_PACKET_TX_ERROR_##f,
foreach_af_packet_tx_func_error
#undef _
AF_PACKET_TX_N_ERROR,
} af_packet_tx_func_error_t;
static char * af_packet_tx_func_error_strings[] = {
#define _(n,s) s,
foreach_af_packet_tx_func_error
#undef _
};
static u8 * format_af_packet_device_name (u8 * s, va_list * args)
{
u32 i = va_arg (*args, u32);
af_packet_main_t * apm = &af_packet_main;
af_packet_if_t * apif = vec_elt_at_index (apm->interfaces, i);
s = format (s, "host-%s", apif->host_if_name);
return s;
}
static u8 * format_af_packet_device (u8 * s, va_list * args)
{
s = format (s, "Linux PACKET socket interface");
return s;
}
static u8 * format_af_packet_tx_trace (u8 * s, va_list * args)
{
s = format (s, "Unimplemented...");
return s;
}
static uword
af_packet_interface_tx (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
af_packet_main_t * apm = &af_packet_main;
u32 * buffers = vlib_frame_args (frame);
u32 n_left = frame->n_vectors;
u32 n_sent = 0;
vnet_interface_output_runtime_t * rd = (void *) node->runtime_data;
af_packet_if_t * apif = vec_elt_at_index (apm->interfaces, rd->dev_instance);
int block = 0;
u32 block_size = apif->tx_req->tp_block_size;
u32 frame_size = apif->tx_req->tp_frame_size;
u32 frame_num = apif->tx_req->tp_frame_nr;
u8 * block_start = apif->tx_ring + block * block_size;
u32 tx_frame = apif->next_tx_frame;
struct tpacket2_hdr * tph;
u32 frame_not_ready = 0;
while(n_left > 0)
{
u32 len;
u32 offset = 0;
vlib_buffer_t * b0;
n_left--;
u32 bi = buffers[0];
buffers++;
tph = (struct tpacket2_hdr *) (block_start + tx_frame * frame_size);
if(tph->tp_status & (TP_STATUS_SEND_REQUEST | TP_STATUS_SENDING))
{
frame_not_ready++;
goto next;
}
do
{
b0 = vlib_get_buffer (vm, bi);
len = b0->current_length;
memcpy((u8 *) tph + TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + offset,
vlib_buffer_get_current(b0), len);
offset += len;
}
while ((bi = b0->next_buffer));
tph->tp_len = tph->tp_snaplen = offset;
tph->tp_status = TP_STATUS_SEND_REQUEST;
n_sent++;
next:
tx_frame = (tx_frame + 1) % frame_num;
}
CLIB_MEMORY_BARRIER();
if (n_sent)
{
apif->next_tx_frame = tx_frame;
if (sendto(apif->fd, NULL, 0, MSG_DONTWAIT, NULL, 0) == -1)
clib_unix_error("tx sendto failure");
}
if (frame_not_ready)
vlib_error_count (vm, node->node_index, AF_PACKET_TX_ERROR_FRAME_NOT_READY,
frame_not_ready);
vlib_buffer_free (vm, vlib_frame_args (frame), frame->n_vectors);
return frame->n_vectors;
}
static void
af_packet_set_interface_next_node (vnet_main_t *vnm, u32 hw_if_index,
u32 node_index)
{
af_packet_main_t * apm = &af_packet_main;
vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
af_packet_if_t * apif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
/* Shut off redirection */
if (node_index == ~0)
{
apif->per_interface_next_index = node_index;
return;
}
apif->per_interface_next_index =
vlib_node_add_next (vlib_get_main(), af_packet_input_node.index, node_index);
}
static void af_packet_clear_hw_interface_counters (u32 instance)
{
/* Nothing for now */
}
static clib_error_t *
af_packet_interface_admin_up_down (vnet_main_t * vnm, u32 hw_if_index, u32 flags)
{
af_packet_main_t * apm = &af_packet_main;
vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, hw_if_index);
af_packet_if_t * apif = pool_elt_at_index (apm->interfaces, hw->dev_instance);
apif->is_admin_up = (flags & VNET_SW_INTERFACE_FLAG_ADMIN_UP) != 0;
return 0;
}
static clib_error_t *
af_packet_subif_add_del_function (vnet_main_t * vnm,
u32 hw_if_index,
struct vnet_sw_interface_t * st,
int is_add)
{
/* Nothing for now */
return 0;
}
VNET_DEVICE_CLASS (af_packet_device_class) = {
.name = "af-packet",
.tx_function = af_packet_interface_tx,
.format_device_name = format_af_packet_device_name,
.format_device = format_af_packet_device,
.format_tx_trace = format_af_packet_tx_trace,
.tx_function_n_errors = AF_PACKET_TX_N_ERROR,
.tx_function_error_strings = af_packet_tx_func_error_strings,
.rx_redirect_to_node = af_packet_set_interface_next_node,
.clear_counters = af_packet_clear_hw_interface_counters,
.admin_up_down_function = af_packet_interface_admin_up_down,
.subif_add_del_function = af_packet_subif_add_del_function,
.no_flatten_output_chains = 1,
};

279
vnet/vnet/devices/af_packet/node.c Normal file
View File

@ -0,0 +1,279 @@
/*
*------------------------------------------------------------------
* 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/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 _
};
enum {
AF_PACKET_INPUT_NEXT_DROP,
AF_PACKET_INPUT_NEXT_ETHERNET_INPUT,
AF_PACKET_INPUT_N_NEXT,
};
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_tci %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,
t->tph.tp_vlan_tci,
#ifdef TP_STATUS_VLAN_TPID_VALID
t->tph.tp_vlan_tpid,
#endif
t->tph.tp_net);
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);
#if DPDK > 0
struct rte_mbuf * mbuf = ((struct rte_mbuf *) b) - 1;
struct rte_mbuf * first_mbuf = ((struct rte_mbuf *) first_b) - 1;
struct rte_mbuf * prev_mbuf = ((struct rte_mbuf *) prev_b) - 1;
#endif
/* 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;
#if DPDK > 0
first_mbuf->nb_segs++;
prev_mbuf->next = mbuf;
mbuf->data_len = b->current_length;
mbuf->data_off = RTE_PKTMBUF_HEADROOM + b->current_data;
mbuf->next = 0;
#endif
}
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 = vec_elt_at_index(apm->interfaces, device_idx);
struct tpacket2_hdr *tph;
u32 next_index = AF_PACKET_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;
n_free_bufs = vec_len (apm->rx_buffers);
if (PREDICT_FALSE(n_free_bufs < VLIB_FRAME_SIZE))
{
vec_validate(apm->rx_buffers, VLIB_FRAME_SIZE + n_free_bufs - 1);
n_free_bufs += vlib_buffer_alloc(vm, &apm->rx_buffers[n_free_bufs], VLIB_FRAME_SIZE);
_vec_len (apm->rx_buffers) = 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, * first_b0 = 0;
u32 next0 = AF_PACKET_INPUT_NEXT_ETHERNET_INPUT;
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, first_bi0 = 0, prev_bi0;
while (data_len)
{
/* grab free buffer */
u32 last_empty_buffer = vec_len (apm->rx_buffers) - 1;
prev_bi0 = bi0;
bi0 = apm->rx_buffers[last_empty_buffer];
b0 = vlib_get_buffer (vm, bi0);
_vec_len (apm->rx_buffers) = 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;
memcpy (vlib_buffer_get_current (b0), (u8 *) tph + tph->tp_mac + offset, bytes_to_copy);
/* fill buffer header */
b0->clone_count = 0;
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;
memcpy(&tr->tph, tph, sizeof(struct tpacket2_hdr));
}
/* 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;
clib_bitmap_foreach (i, apm->pending_input_bitmap,
({
clib_bitmap_set (apm->pending_input_bitmap, i, 1);
n_rx_packets += af_packet_device_input_fn(vm, node, frame, i);
}));
return n_rx_packets;
}
VLIB_REGISTER_NODE (af_packet_input_node) = {
.function = af_packet_input_fn,
.name = "af-packet-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,
.n_next_nodes = AF_PACKET_INPUT_N_NEXT,
.next_nodes = {
[AF_PACKET_INPUT_NEXT_DROP] = "error-drop",
[AF_PACKET_INPUT_NEXT_ETHERNET_INPUT] = "ethernet-input",
},
};