Function netisr_poll

freebsd/kern/kern_poll.c:433–469

* netisr_poll is typically scheduled once per tick. */

 * netisr_poll is typically scheduled once per tick.
 */
void
netisr_poll(void)
{
	int i, cycles;
	enum poll_cmd arg = POLL_ONLY;

	NET_EPOCH_ASSERT();

	if (poll_handlers == 0)
		return;

	mtx_lock(&poll_mtx);
	if (!netisr_poll_scheduled) {
		mtx_unlock(&poll_mtx);
		return;
	}
	netisr_poll_scheduled = 0;
	phase = 3;
	if (residual_burst == 0) { /* first call in this tick */
		microuptime(&poll_start_t);
		if (++reg_frac_count == reg_frac) {
			arg = POLL_AND_CHECK_STATUS;
			reg_frac_count = 0;
		}

		residual_burst = poll_burst;
	}
	cycles = (residual_burst < poll_each_burst) ?
		residual_burst : poll_each_burst;
	residual_burst -= cycles;

	for (i = 0 ; i < poll_handlers ; i++)
		pr[i].handler(pr[i].ifp, arg, cycles);

	phase = 4;
	mtx_unlock(&poll_mtx);
}

/*
 * Try to register routine for polling. Returns 0 if successful