/* * The TOE wants an L2 table entry that it can use to reach the next hop over * the specified port. Produce such an entry - create one if needed. * * Note that the ifnet could be a pseudo-device like if_vlan, if_lagg, etc. on * top of the real cxgbe interface. */ struct l2t_entry * t4_l2t_get(struct port_info *pi, struct ifnet *ifp, struct sockaddr *sa) { struct l2t_entry *e; struct adapter *sc = pi->adapter; struct l2t_data *d = sc->l2t; u_int hash, smt_idx = pi->port_id; KASSERT(sa->sa_family == AF_INET || sa->sa_family == AF_INET6, ("%s: sa %p has unexpected sa_family %d", __func__, sa, sa->sa_family)); #ifndef VLAN_TAG if (ifp->if_type == IFT_L2VLAN) return (NULL); #endif hash = l2_hash(d, sa, ifp->if_index); rw_wlock(&d->lock); for (e = d->l2tab[hash].first; e; e = e->next) { if (l2_cmp(sa, e) == 0 && e->ifp == ifp && e->smt_idx == smt_idx) { l2t_hold(d, e); goto done; } } /* Need to allocate a new entry */ e = t4_alloc_l2e(d); if (e) { mtx_lock(&e->lock); /* avoid race with t4_l2t_free */ e->next = d->l2tab[hash].first; d->l2tab[hash].first = e; e->state = L2T_STATE_RESOLVING; l2_store(sa, e); e->ifp = ifp; e->smt_idx = smt_idx; e->hash = hash; e->lport = pi->lport; e->wrq = &sc->sge.ctrlq[pi->port_id]; e->iqid = sc->sge.ofld_rxq[pi->vi[0].first_ofld_rxq].iq.abs_id; atomic_store_rel_int(&e->refcnt, 1); #ifdef VLAN_TAG if (ifp->if_type == IFT_L2VLAN) VLAN_TAG(ifp, &e->vlan); else e->vlan = VLAN_NONE; #endif mtx_unlock(&e->lock); } done: rw_wunlock(&d->lock); return e; }
/* * Allocate an L2T entry for use by a switching rule. Such need to be * explicitly freed and while busy they are not on any hash chain, so normal * address resolution updates do not see them. */ struct l2t_entry * t4_l2t_alloc_switching(struct l2t_data *d) { struct l2t_entry *e; rw_wlock(&d->lock); e = t4_alloc_l2e(d); if (e) { mtx_lock(&e->lock); /* avoid race with t4_l2t_free */ e->state = L2T_STATE_SWITCHING; atomic_store_rel_int(&e->refcnt, 1); mtx_unlock(&e->lock); } rw_wunlock(&d->lock); return e; }