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packet_mmap.c
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packet_mmap.c
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/select.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <poll.h>
#include <pthread.h>
/* params */
static char * str_devname= NULL;
static int c_packet_sz = 150;
static int c_packet_nb = 1000;
static int c_buffer_sz = 1024*8;
static int c_buffer_nb = 1024;
static int c_sndbuf_sz = 0;
static int c_mtu = 0;
static int c_send_mask = 127;
static int c_error = 0;
static int mode_dgram = 0;
static int mode_thread = 0;
static int mode_loss = 0;
static int mode_verbose = 0;
/* globals */
volatile int fd_socket;
volatile int data_offset = 0;
volatile struct sockaddr_ll *ps_sockaddr = NULL;
volatile struct tpacket_hdr * ps_header_start;
volatile int shutdown_flag = 0;
struct tpacket_req s_packet_req;
void *task_send(void *arg);
void *task_fill(void *arg);
static void usage()
{
fprintf( stderr,
"Usage: ./packet_mmap [OPTION] [INTERFACE]\n"
" -h\tshow this help\n"
" -g\tuse SOCK_DGRAM\n"
" -t\tuse dual thread\n"
" -s\tset packet size\n"
" -c\tset packet count\n"
" -m\tset mtu\n"
" -b\tset buffer size\n"
" -n\tset buffer count\n"
" -j\tset send() period (mask==0)\n"
" -z\tset socket buffer size\n"
" -l\tdiscard wrong packets\n"
" -e\tgenerate error [num]\n"
" -v\tbe verbose\n"
);
}
void getargs( int argc, char ** argv )
{
int c;
opterr = 0;
while( (c = getopt( argc, argv, "e:s:m:b:B:n:c:z:j:vhgtl"))!= EOF) {
switch( c ) {
case 's': c_packet_sz = strtoul( optarg, NULL, 0 ); break;
case 'c': c_packet_nb = strtoul( optarg, NULL, 0 ); break;
case 'b': c_buffer_sz = strtoul( optarg, NULL, 0 ); break;
case 'n': c_buffer_nb = strtoul( optarg, NULL, 0 ); break;
case 'z': c_sndbuf_sz = strtoul( optarg, NULL, 0 ); break;
case 'm': c_mtu = strtoul( optarg, NULL, 0 ); break;
case 'j': c_send_mask = strtoul( optarg, NULL, 0 ); break;
case 'e': c_error = strtoul( optarg, NULL, 0 ); break;
case 'g': mode_dgram = 1; break;
case 't': mode_thread = 1; break;
case 'l': mode_loss = 1; break;
case 'v': mode_verbose= 1; break;
case 'h': usage(); exit( EXIT_FAILURE ); break;
case '?':
if ( isprint (optopt) ) {
fprintf ( stderr,
"ERROR: unrecognised option \"%c\"\n",
(char) optopt );
exit( EXIT_FAILURE );
}
break;
default:
fprintf( stderr, "ERROR: unrecognised command line option\n");
exit( EXIT_FAILURE );
break;
}
}
/* take first residual non option argv element as interface name. */
if ( optind < argc ) {
str_devname = argv[ optind ];
}
if( !str_devname ) {
fprintf( stderr, "ERROR: No interface was specified\n");
usage();
exit( EXIT_FAILURE );
}
printf( "CURRENT SETTINGS:\n" );
printf( "str_devname: %s\n", str_devname );
printf( "c_packet_sz: %d\n", c_packet_sz );
printf( "c_buffer_sz: %d\n", c_buffer_sz );
printf( "c_buffer_nb: %d\n", c_buffer_nb );
printf( "c_packet_sz count: %d\n", c_packet_sz );
printf( "c_packet_nb count: %d\n", c_packet_nb );
printf( "c_mtu: %d\n", c_mtu );
printf( "c_send_mask: %d\n", c_send_mask );
printf( "c_sndbuf_sz: %d\n", c_sndbuf_sz );
printf( "mode_loss: %d\n", mode_loss );
printf( "mode_thread: %d\n", mode_thread );
}
int main( int argc, char ** argv )
{
uint32_t size, opt_len;
int fd, i, ec;
struct pollfd s_pfd;
struct sockaddr_ll my_addr, peer_addr;
struct ifreq s_ifr; /* points to one interface returned from ioctl */
int len;
int i_updated_cnt;
int i_ifindex;
int i_header_size;
int smp_test = 1;
int i_hdrlen,i_sockopt_size, e_version;
int mode_socket;
int tmp;
int i_nb_error;
pthread_attr_t t_attr_send,t_attr_fill;
struct sched_param para_send,para_fill;
pthread_t t_send, t_fill;
/* get configuration */
getargs( argc, argv );
printf("\nSTARTING TEST:\n");
if (mode_dgram) {
mode_socket = SOCK_DGRAM;
}
else
mode_socket = SOCK_RAW;
fd_socket = socket(PF_PACKET, mode_socket, htons(ETH_P_ALL));
if(fd_socket == -1)
{
perror("socket");
return EXIT_FAILURE;
}
/* start socket config: device and mtu */
/* clear structure */
memset(&my_addr, 0, sizeof(struct sockaddr_ll));
my_addr.sll_family = PF_PACKET;
my_addr.sll_protocol = htons(ETH_P_ALL);
/* initialize interface struct */
strncpy (s_ifr.ifr_name, str_devname, sizeof(s_ifr.ifr_name));
/* Get the broad cast address */
ec = ioctl(fd_socket, SIOCGIFINDEX, &s_ifr);
if(ec == -1)
{
perror("iotcl");
return EXIT_FAILURE;
}
/* update with interface index */
i_ifindex = s_ifr.ifr_ifindex;
/* new mtu value */
if(c_mtu) {
s_ifr.ifr_mtu = c_mtu;
/* update the mtu through ioctl */
ec = ioctl(fd_socket, SIOCSIFMTU, &s_ifr);
if(ec == -1)
{
perror("iotcl");
return EXIT_FAILURE;
}
}
/* set sockaddr info */
memset(&my_addr, 0, sizeof(struct sockaddr_ll));
my_addr.sll_family = AF_PACKET;
my_addr.sll_protocol = ETH_P_ALL;
my_addr.sll_ifindex = i_ifindex;
/* bind port */
if (bind(fd_socket, (struct sockaddr *)&my_addr, sizeof(struct sockaddr_ll)) == -1)
{
perror("bind");
return EXIT_FAILURE;
}
/* prepare Tx ring request */
s_packet_req.tp_block_size = c_buffer_sz;
s_packet_req.tp_frame_size = c_buffer_sz;
s_packet_req.tp_block_nr = c_buffer_nb;
s_packet_req.tp_frame_nr = c_buffer_nb;
/* calculate memory to mmap in the kernel */
size = s_packet_req.tp_block_size * s_packet_req.tp_block_nr;
/* set packet loss option */
tmp = mode_loss;
if (setsockopt(fd_socket,
SOL_PACKET,
PACKET_LOSS,
(char *)&tmp,
sizeof(tmp))<0)
{
perror("setsockopt: PACKET_LOSS");
return EXIT_FAILURE;
}
/* send TX ring request */
if (setsockopt(fd_socket,
SOL_PACKET,
PACKET_TX_RING,
(char *)&s_packet_req,
sizeof(s_packet_req))<0)
{
perror("setsockopt: PACKET_TX_RING");
return EXIT_FAILURE;
}
/* change send buffer size */
if(c_sndbuf_sz) {
printf("send buff size = %d\n", c_sndbuf_sz);
if (setsockopt(fd_socket, SOL_SOCKET, SO_SNDBUF, &c_sndbuf_sz,
sizeof(c_sndbuf_sz))< 0)
{
perror("getsockopt: SO_SNDBUF");
return EXIT_FAILURE;
}
}
/* get data offset */
data_offset = TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
printf("data offset = %d bytes\n", data_offset);
/* mmap Tx ring buffers memory */
ps_header_start = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd_socket, 0);
if (ps_header_start == (void*)-1)
{
perror("mmap");
return EXIT_FAILURE;
}
/* fill peer sockaddr for SOCK_DGRAM */
if (mode_dgram)
{
char dstaddr[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
peer_addr.sll_family = AF_PACKET;
peer_addr.sll_protocol = htons(ETH_P_IP);
peer_addr.sll_ifindex = i_ifindex;
peer_addr.sll_halen = ETH_ALEN;
memcpy(&peer_addr.sll_addr, dstaddr, ETH_ALEN);
ps_sockaddr = &peer_addr;
}
/* Set thread priorities, scheduler, ... */
pthread_attr_init(&t_attr_send);
pthread_attr_init(&t_attr_fill);
pthread_attr_setschedpolicy(&t_attr_send,SCHED_RR);
pthread_attr_setschedpolicy(&t_attr_fill,SCHED_RR);
para_send.sched_priority=20;
pthread_attr_setschedparam(&t_attr_send,¶_send);
para_fill.sched_priority=20;
pthread_attr_setschedparam(&t_attr_fill,¶_fill);
/* Start send() thread only on SMP mode */
if(mode_thread) {
if ( pthread_create(&t_send, &t_attr_send, task_send, (void *)1) != 0 )
{
perror("pthread_create()");
abort();
}
}
/* Start thread that fills dummy data in circular buffer */
if ( pthread_create(&t_fill, &t_attr_fill, task_fill, (void *)ps_header_start) != 0 )
{
perror("pthread_create()");
abort();
}
/* Wait end of fill thread */
pthread_join (t_fill, NULL);
if(mode_thread) {
shutdown_flag = 1;
printf("Shutdown requested (%d)\n",shutdown_flag);
pthread_join (t_send, NULL);
}
do {
ec = (int) task_send((void*)0);
printf("Loop until queue empty (%d)\n", ec);
} while((ec != 0)&&(c_error == 0));
/* check buffer */
i_nb_error = 0;
for(i=0; i<c_buffer_nb; i++)
{
struct tpacket_hdr * ps_header;
ps_header = ((struct tpacket_hdr *)((void *)ps_header_start + (c_buffer_sz*i)));
switch((volatile uint32_t)ps_header->tp_status)
{
case TP_STATUS_SEND_REQUEST:
printf("A frame has not been sent %p\n",ps_header);
i_nb_error++;
break;
case TP_STATUS_LOSING:
printf("An error has occured during transfer\n");
i_nb_error++;
break;
default:
break;
}
}
printf("END (number of error:%d)\n", i_nb_error);
/* close fd socket */
//close(fd_socket);
/* display header of all blocks */
return EXIT_SUCCESS;
}
/* This task will call send() procedure */
void *task_send(void *arg) {
int ec_send;
static int total=0;
int blocking = (int) arg;
if(blocking) printf("start send() thread\n");
do
{
/* send all buffers with TP_STATUS_SEND_REQUEST */
/* Wait end of transfer */
if(mode_verbose) printf("send() start\n");
ec_send = sendto(fd_socket,
NULL,
0,
(blocking? 0 : MSG_DONTWAIT),
(struct sockaddr *) ps_sockaddr,
sizeof(struct sockaddr_ll));
if(mode_verbose) printf("send() end (ec=%d)\n",ec_send);
if(ec_send < 0) {
perror("send");
break;
}
else if ( ec_send == 0 ) {
/* nothing to do => schedule : useful if no SMP */
usleep(0);
}
else {
total += ec_send/(c_packet_sz);
printf("send %d packets (+%d bytes)\n",total, ec_send);
fflush(0);
}
} while(blocking && !shutdown_flag);
if(blocking) printf("end of task send()\n");
//printf("end of task send(ec=%x)\n", ec_send);
return (void*) ec_send;
}
/* This task will fill circular buffer */
void *task_fill(void *arg) {
int i,j;
int i_index = 0;
char * data;
int first_loop = 1;
struct tpacket_hdr * ps_header;
int ec_send = 0;
printf( "start fill() thread\n");
for(i=1; i <= c_packet_nb; i++)
{
int i_index_start = i_index;
int loop = 1;
/* get free buffer */
do {
ps_header = ((struct tpacket_hdr *)((void *)ps_header_start + (c_buffer_sz*i_index)));
data = ((void*) ps_header) + data_offset;
switch((volatile uint32_t)ps_header->tp_status)
{
case TP_STATUS_AVAILABLE:
/* fill data in buffer */
if(first_loop) {
for(j=0;j<c_packet_sz;j++)
data[j] = j;
}
loop = 0;
break;
case TP_STATUS_WRONG_FORMAT:
printf("An error has occured during transfer\n");
exit(EXIT_FAILURE);
break;
default:
/* nothing to do => schedule : useful if no SMP */
usleep(0);
break;
}
}
while(loop == 1);
i_index ++;
if(i_index >= c_buffer_nb)
{
i_index = 0;
first_loop = 0;
}
/* update packet len */
ps_header->tp_len = c_packet_sz;
/* set header flag to USER (trigs xmit)*/
ps_header->tp_status = TP_STATUS_SEND_REQUEST;
/* if smp mode selected */
if(!mode_thread)
{
/* send all packets */
if( ((i&c_send_mask)==0) || (ec_send < 0) || (i == c_packet_nb) )
{
/* send all buffers with TP_STATUS_SEND_REQUEST */
/* Don't wait end of transfer */
ec_send = (int) task_send((void*)0);
}
}
else if(c_error) {
if(i == (c_packet_nb/2))
{
int ec_close;
if(mode_verbose) printf("close() start\n");
if(c_error == 1) {
ec_close = close(fd_socket);
}
if(c_error == 2) {
if (setsockopt(fd_socket,
SOL_PACKET,
PACKET_TX_RING,
(char *)&s_packet_req,
sizeof(s_packet_req))<0)
{
perror("setsockopt: PACKET_TX_RING");
//return EXIT_FAILURE;
}
}
if(mode_verbose) printf("close end (ec:%d)\n",ec_close);
break;
}
}
}
printf("end of task fill()\n");
return(NULL);
}