Function netisr_unregister

freebsd/net/netisr.c:634–678

* Remove the registration of a network protocol, which requires clearing * per-protocol fields across all workstreams, including freeing all mbufs in * the queues at time of unregister. All work in netisr is briefly suspended * while this takes place. */

 * while this takes place.
 */
void
netisr_unregister(const struct netisr_handler *nhp)
{
	VNET_ITERATOR_DECL(vnet_iter);
	struct netisr_work *npwp;
#ifdef INVARIANTS
	const char *name;
#endif
	u_int i, proto;

	proto = nhp->nh_proto;
#ifdef INVARIANTS
	name = nhp->nh_name;
#endif
	KASSERT(proto < NETISR_MAXPROT,
	    ("%s(%u): protocol too big for %s", __func__, proto, name));

	NETISR_WLOCK();
	KASSERT(netisr_proto[proto].np_handler != NULL,
	    ("%s(%u): protocol not registered for %s", __func__, proto,
	    name));

#ifdef VIMAGE
	VNET_LIST_RLOCK_NOSLEEP();
	VNET_FOREACH(vnet_iter) {
		CURVNET_SET(vnet_iter);
		V_netisr_enable[proto] = 0;
		CURVNET_RESTORE();
	}
	VNET_LIST_RUNLOCK_NOSLEEP();
#endif

	netisr_proto[proto].np_name = NULL;
	netisr_proto[proto].np_handler = NULL;
	netisr_proto[proto].np_m2flow = NULL;
	netisr_proto[proto].np_m2cpuid = NULL;
	netisr_proto[proto].np_qlimit = 0;
	netisr_proto[proto].np_policy = 0;
	CPU_FOREACH(i) {
		npwp = &(DPCPU_ID_PTR(i, nws))->nws_work[proto];
		netisr_drain_proto(npwp);
		bzero(npwp, sizeof(*npwp));
	}
	NETISR_WUNLOCK();
}

#ifdef VIMAGE
void