static void timer_elapsed(int number)
{
itimer.it_interval.tv_sec = 0;
itimer.it_interval.tv_usec = interval;
itimer.it_value.tv_sec = 0;
itimer.it_value.tv_usec = interval;
pull_and_flush_tx_ring(tx_sock);
setitimer(ITIMER_REAL, &itimer, NULL);
}
static void timer_elapsed(int number)
{
int ret = pull_and_flush_tx_ring(sock);
if (unlikely(ret < 0)) {
/* We could hit EBADF if the socket has been closed before
* the timer was triggered.
*/
if (errno != EBADF && errno != ENOBUFS)
panic("Flushing TX_RING failed: %s!\n", strerror(errno));
}
set_itimer_interval_value(&itimer, 0, interval);
setitimer(ITIMER_REAL, &itimer, NULL);
}
static void xmit_slowpath_or_die(struct ctx *ctx, int cpu, unsigned long orig_num)
{
int ret, icmp_sock = -1;
unsigned long num = 1, i = 0;
struct timeval start, end, diff;
unsigned long long tx_bytes = 0, tx_packets = 0;
struct packet_dyn *pktd;
struct sockaddr_ll saddr = {
.sll_family = PF_PACKET,
.sll_halen = ETH_ALEN,
.sll_ifindex = device_ifindex(ctx->device),
};
if (ctx->num > 0)
num = ctx->num;
if (ctx->num == 0 && orig_num > 0)
num = 0;
if (ctx->smoke_test)
icmp_sock = xmit_smoke_setup(ctx);
drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
bug_on(gettimeofday(&start, NULL));
while (likely(sigint == 0 && num > 0 && plen > 0)) {
pktd = &packet_dyn[i];
if (pktd->clen + pktd->rlen + pktd->slen) {
apply_counter(i);
apply_randomizer(i);
apply_csum16(i);
}
retry:
ret = sendto(sock, packets[i].payload, packets[i].len, 0,
(struct sockaddr *) &saddr, sizeof(saddr));
if (unlikely(ret < 0)) {
if (errno == ENOBUFS) {
sched_yield();
goto retry;
}
if (ctx->smoke_test)
panic("Sendto error: %s!\n", strerror(errno));
}
tx_bytes += packets[i].len;
tx_packets++;
if (ctx->smoke_test) {
ret = xmit_smoke_probe(icmp_sock, ctx);
if (unlikely(ret < 0)) {
printf("%sSmoke test alert:%s\n", colorize_start(bold), colorize_end());
printf(" Remote host seems to be unresponsive to ICMP probes!\n");
printf(" Last instance was packet%lu, seed:%u, trafgen snippet:\n\n",
i, seed);
dump_trafgen_snippet(packets[i].payload, packets[i].len);
break;
}
}
if (!ctx->rand) {
i++;
if (i >= plen)
i = 0;
} else
i = rand() % plen;
if (ctx->num > 0)
num--;
if ((ctx->gap.tv_sec | ctx->gap.tv_nsec) > 0)
nanosleep(&ctx->gap, NULL);
}
bug_on(gettimeofday(&end, NULL));
timersub(&end, &start, &diff);
if (ctx->smoke_test)
close(icmp_sock);
stats[cpu].tx_packets = tx_packets;
stats[cpu].tx_bytes = tx_bytes;
stats[cpu].tv_sec = diff.tv_sec;
stats[cpu].tv_usec = diff.tv_usec;
stats[cpu].state |= CPU_STATS_STATE_RES;
}
static void xmit_fastpath_or_die(struct ctx *ctx, int cpu, unsigned long orig_num)
{
int ifindex = device_ifindex(ctx->device);
uint8_t *out = NULL;
unsigned int it = 0;
unsigned long num = 1, i = 0, size;
struct ring tx_ring;
struct frame_map *hdr;
struct timeval start, end, diff;
struct packet_dyn *pktd;
unsigned long long tx_bytes = 0, tx_packets = 0;
fmemset(&tx_ring, 0, sizeof(tx_ring));
size = ring_size(ctx->device, ctx->reserve_size);
set_sock_prio(sock, 512);
set_packet_loss_discard(sock);
setup_tx_ring_layout(sock, &tx_ring, size, ctx->jumbo_support);
create_tx_ring(sock, &tx_ring, ctx->verbose);
mmap_tx_ring(sock, &tx_ring);
alloc_tx_ring_frames(sock, &tx_ring);
bind_tx_ring(sock, &tx_ring, ifindex);
drop_privileges(ctx->enforce, ctx->uid, ctx->gid);
if (ctx->num > 0)
num = ctx->num;
if (ctx->num == 0 && orig_num > 0)
num = 0;
bug_on(gettimeofday(&start, NULL));
while (likely(sigint == 0 && num > 0 && plen > 0)) {
if (!user_may_pull_from_tx(tx_ring.frames[it].iov_base)) {
int ret = pull_and_flush_tx_ring(sock);
if (unlikely(ret < 0)) {
/* We could hit EBADF if the socket has been closed before
* the timer was triggered.
*/
if (errno != EBADF && errno != ENOBUFS)
panic("Flushing TX_RING failed: %s!\n", strerror(errno));
}
continue;
}
hdr = tx_ring.frames[it].iov_base;
out = ((uint8_t *) hdr) + TPACKET2_HDRLEN - sizeof(struct sockaddr_ll);
hdr->tp_h.tp_snaplen = packets[i].len;
hdr->tp_h.tp_len = packets[i].len;
pktd = &packet_dyn[i];
if (pktd->clen + pktd->rlen + pktd->slen) {
apply_counter(i);
apply_randomizer(i);
apply_csum16(i);
}
fmemcpy(out, packets[i].payload, packets[i].len);
tx_bytes += packets[i].len;
tx_packets++;
if (!ctx->rand) {
i++;
if (i >= plen)
i = 0;
} else
i = rand() % plen;
kernel_may_pull_from_tx(&hdr->tp_h);
it++;
if (it >= tx_ring.layout.tp_frame_nr)
it = 0;
if (ctx->num > 0)
num--;
}
bug_on(gettimeofday(&end, NULL));
timersub(&end, &start, &diff);
pull_and_flush_tx_ring_wait(sock);
destroy_tx_ring(sock, &tx_ring);
stats[cpu].tx_packets = tx_packets;
stats[cpu].tx_bytes = tx_bytes;
stats[cpu].tv_sec = diff.tv_sec;
stats[cpu].tv_usec = diff.tv_usec;
stats[cpu].state |= CPU_STATS_STATE_RES;
}