/* $OpenBSD: altq_cbq.c,v 1.26 2011/07/03 23:59:43 henning Exp $ */ /* $KAME: altq_cbq.c,v 1.9 2000/12/14 08:12:45 thorpej Exp $ */ /* * Copyright (c) Sun Microsystems, Inc. 1993-1998 All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the SMCC Technology * Development Group at Sun Microsystems, Inc. * * 4. The name of the Sun Microsystems, Inc nor may not be used to endorse or * promote products derived from this software without specific prior * written permission. * * SUN MICROSYSTEMS DOES NOT CLAIM MERCHANTABILITY OF THIS SOFTWARE OR THE * SUITABILITY OF THIS SOFTWARE FOR ANY PARTICULAR PURPOSE. The software is * provided "as is" without express or implied warranty of any kind. * * These notices must be retained in any copies of any part of this software. */ #include #include #include #include #include #include #include #include #include #include #include #include /* * Forward Declarations. */ static int cbq_class_destroy(cbq_state_t *, struct rm_class *); static struct rm_class *clh_to_clp(cbq_state_t *, u_int32_t); static int cbq_clear_interface(cbq_state_t *); static int cbq_request(struct ifaltq *, int, void *); static int cbq_enqueue(struct ifaltq *, struct mbuf *, struct altq_pktattr *); static struct mbuf *cbq_dequeue(struct ifaltq *, int); static void cbqrestart(struct ifaltq *); static void get_class_stats(class_stats_t *, struct rm_class *); static void cbq_purge(cbq_state_t *); /* * int * cbq_class_destroy(cbq_mod_state_t *, struct rm_class *) - This * function destroys a given traffic class. Before destroying * the class, all traffic for that class is released. */ static int cbq_class_destroy(cbq_state_t *cbqp, struct rm_class *cl) { int i; /* delete the class */ rmc_delete_class(&cbqp->ifnp, cl); /* * free the class handle */ for (i = 0; i < CBQ_MAX_CLASSES; i++) if (cbqp->cbq_class_tbl[i] == cl) cbqp->cbq_class_tbl[i] = NULL; if (cl == cbqp->ifnp.root_) cbqp->ifnp.root_ = NULL; if (cl == cbqp->ifnp.default_) cbqp->ifnp.default_ = NULL; return (0); } /* convert class handle to class pointer */ static struct rm_class * clh_to_clp(cbq_state_t *cbqp, u_int32_t chandle) { int i; struct rm_class *cl; if (chandle == 0) return (NULL); /* * first, try the slot corresponding to the lower bits of the handle. * if it does not match, do the linear table search. */ i = chandle % CBQ_MAX_CLASSES; if ((cl = cbqp->cbq_class_tbl[i]) != NULL && cl->stats_.handle == chandle) return (cl); for (i = 0; i < CBQ_MAX_CLASSES; i++) if ((cl = cbqp->cbq_class_tbl[i]) != NULL && cl->stats_.handle == chandle) return (cl); return (NULL); } static int cbq_clear_interface(cbq_state_t *cbqp) { int again, i; struct rm_class *cl; /* clear out the classes now */ do { again = 0; for (i = 0; i < CBQ_MAX_CLASSES; i++) { if ((cl = cbqp->cbq_class_tbl[i]) != NULL) { if (is_a_parent_class(cl)) again++; else { cbq_class_destroy(cbqp, cl); cbqp->cbq_class_tbl[i] = NULL; if (cl == cbqp->ifnp.root_) cbqp->ifnp.root_ = NULL; if (cl == cbqp->ifnp.default_) cbqp->ifnp.default_ = NULL; } } } } while (again); return (0); } static int cbq_request(struct ifaltq *ifq, int req, void *arg) { cbq_state_t *cbqp = (cbq_state_t *)ifq->altq_disc; switch (req) { case ALTRQ_PURGE: cbq_purge(cbqp); break; } return (0); } /* copy the stats info in rm_class to class_states_t */ static void get_class_stats(class_stats_t *statsp, struct rm_class *cl) { statsp->handle = cl->stats_.handle; statsp->xmit_cnt = cl->stats_.xmit_cnt; statsp->drop_cnt = cl->stats_.drop_cnt; statsp->over = cl->stats_.over; statsp->borrows = cl->stats_.borrows; statsp->overactions = cl->stats_.overactions; statsp->delays = cl->stats_.delays; statsp->depth = cl->depth_; statsp->priority = cl->pri_; statsp->maxidle = cl->maxidle_; statsp->minidle = cl->minidle_; statsp->offtime = cl->offtime_; statsp->qmax = qlimit(cl->q_); statsp->ns_per_byte = cl->ns_per_byte_; statsp->wrr_allot = cl->w_allotment_; statsp->qcnt = qlen(cl->q_); statsp->avgidle = cl->avgidle_; statsp->qtype = qtype(cl->q_); #ifdef ALTQ_RED if (q_is_red(cl->q_)) red_getstats(cl->red_, &statsp->red[0]); #endif } int cbq_pfattach(struct pf_altq *a) { struct ifnet *ifp; int s, error; if ((ifp = ifunit(a->ifname)) == NULL || a->altq_disc == NULL) return (EINVAL); s = splnet(); error = altq_attach(&ifp->if_snd, ALTQT_CBQ, a->altq_disc, cbq_enqueue, cbq_dequeue, cbq_request, NULL, NULL); splx(s); return (error); } int cbq_add_altq(struct pf_altq *a) { cbq_state_t *cbqp; struct ifnet *ifp; if ((ifp = ifunit(a->ifname)) == NULL) return (EINVAL); if (!ALTQ_IS_READY(&ifp->if_snd)) return (ENODEV); /* allocate and initialize cbq_state_t */ cbqp = malloc(sizeof(cbq_state_t), M_DEVBUF, M_WAITOK|M_ZERO); CALLOUT_INIT(&cbqp->cbq_callout); cbqp->cbq_qlen = 0; cbqp->ifnp.ifq_ = &ifp->if_snd; /* keep the ifq */ /* keep the state in pf_altq */ a->altq_disc = cbqp; return (0); } int cbq_remove_altq(struct pf_altq *a) { cbq_state_t *cbqp; if ((cbqp = a->altq_disc) == NULL) return (EINVAL); a->altq_disc = NULL; cbq_clear_interface(cbqp); if (cbqp->ifnp.default_) cbq_class_destroy(cbqp, cbqp->ifnp.default_); if (cbqp->ifnp.root_) cbq_class_destroy(cbqp, cbqp->ifnp.root_); /* deallocate cbq_state_t */ free(cbqp, M_DEVBUF); return (0); } int cbq_add_queue(struct pf_altq *a) { struct rm_class *borrow, *parent; cbq_state_t *cbqp; struct rm_class *cl; struct cbq_opts *opts; int i; if ((cbqp = a->altq_disc) == NULL) return (EINVAL); if (a->qid == 0) return (EINVAL); /* * find a free slot in the class table. if the slot matching * the lower bits of qid is free, use this slot. otherwise, * use the first free slot. */ i = a->qid % CBQ_MAX_CLASSES; if (cbqp->cbq_class_tbl[i] != NULL) { for (i = 0; i < CBQ_MAX_CLASSES; i++) if (cbqp->cbq_class_tbl[i] == NULL) break; if (i == CBQ_MAX_CLASSES) return (EINVAL); } opts = &a->pq_u.cbq_opts; /* check parameters */ if (a->priority >= CBQ_MAXPRI) return (EINVAL); /* Get pointers to parent and borrow classes. */ parent = clh_to_clp(cbqp, a->parent_qid); if (opts->flags & CBQCLF_BORROW) borrow = parent; else borrow = NULL; /* * A class must borrow from its parent or it can not * borrow at all. Hence, borrow can be null. */ if (parent == NULL && (opts->flags & CBQCLF_ROOTCLASS) == 0) { printf("cbq_add_queue: no parent class!\n"); return (EINVAL); } if ((borrow != parent) && (borrow != NULL)) { printf("cbq_add_class: borrow class != parent\n"); return (EINVAL); } /* * check parameters */ switch (opts->flags & CBQCLF_CLASSMASK) { case CBQCLF_ROOTCLASS: if (parent != NULL) return (EINVAL); if (cbqp->ifnp.root_) return (EINVAL); break; case CBQCLF_DEFCLASS: if (cbqp->ifnp.default_) return (EINVAL); break; case 0: if (a->qid == 0) return (EINVAL); break; default: /* more than two flags bits set */ return (EINVAL); } /* * create a class. if this is a root class, initialize the * interface. */ if ((opts->flags & CBQCLF_CLASSMASK) == CBQCLF_ROOTCLASS) { rmc_init(cbqp->ifnp.ifq_, &cbqp->ifnp, opts->ns_per_byte, cbqrestart, a->qlimit, RM_MAXQUEUED, opts->maxidle, opts->minidle, opts->offtime, opts->flags); cl = cbqp->ifnp.root_; } else { cl = rmc_newclass(a->priority, &cbqp->ifnp, opts->ns_per_byte, rmc_delay_action, a->qlimit, parent, borrow, opts->maxidle, opts->minidle, opts->offtime, opts->pktsize, opts->flags); } if (cl == NULL) return (ENOMEM); /* return handle to user space. */ cl->stats_.handle = a->qid; cl->stats_.depth = cl->depth_; /* save the allocated class */ cbqp->cbq_class_tbl[i] = cl; if ((opts->flags & CBQCLF_CLASSMASK) == CBQCLF_DEFCLASS) cbqp->ifnp.default_ = cl; return (0); } int cbq_remove_queue(struct pf_altq *a) { struct rm_class *cl; cbq_state_t *cbqp; int i; if ((cbqp = a->altq_disc) == NULL) return (EINVAL); if ((cl = clh_to_clp(cbqp, a->qid)) == NULL) return (EINVAL); /* if we are a parent class, then return an error. */ if (is_a_parent_class(cl)) return (EINVAL); /* delete the class */ rmc_delete_class(&cbqp->ifnp, cl); /* * free the class handle */ for (i = 0; i < CBQ_MAX_CLASSES; i++) if (cbqp->cbq_class_tbl[i] == cl) { cbqp->cbq_class_tbl[i] = NULL; if (cl == cbqp->ifnp.root_) cbqp->ifnp.root_ = NULL; if (cl == cbqp->ifnp.default_) cbqp->ifnp.default_ = NULL; break; } return (0); } int cbq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes) { cbq_state_t *cbqp; struct rm_class *cl; class_stats_t stats; int error = 0; if ((cbqp = altq_lookup(a->ifname, ALTQT_CBQ)) == NULL) return (EBADF); if ((cl = clh_to_clp(cbqp, a->qid)) == NULL) return (EINVAL); if (*nbytes < sizeof(stats)) return (EINVAL); get_class_stats(&stats, cl); if ((error = copyout((caddr_t)&stats, ubuf, sizeof(stats))) != 0) return (error); *nbytes = sizeof(stats); return (0); } /* * int * cbq_enqueue(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pattr) * - Queue data packets. * * cbq_enqueue is set to ifp->if_altqenqueue and called by an upper * layer (e.g. ether_output). cbq_enqueue queues the given packet * to the cbq, then invokes the driver's start routine. * * Assumptions: called in splnet * Returns: 0 if the queueing is successful. * ENOBUFS if a packet dropping occurred as a result of * the queueing. */ static int cbq_enqueue(struct ifaltq *ifq, struct mbuf *m, struct altq_pktattr *pktattr) { cbq_state_t *cbqp = (cbq_state_t *)ifq->altq_disc; struct rm_class *cl; int len; /* grab class set by classifier */ if ((m->m_flags & M_PKTHDR) == 0) { /* should not happen */ printf("altq: packet for %s does not have pkthdr\n", ifq->altq_ifp->if_xname); m_freem(m); return (ENOBUFS); } if ((cl = clh_to_clp(cbqp, m->m_pkthdr.pf.qid)) == NULL) { cl = cbqp->ifnp.default_; if (cl == NULL) { m_freem(m); return (ENOBUFS); } cl->pktattr_ = NULL; } len = m_pktlen(m); if (rmc_queue_packet(cl, m) != 0) { /* drop occurred. some mbuf was freed in rmc_queue_packet. */ PKTCNTR_ADD(&cl->stats_.drop_cnt, len); return (ENOBUFS); } /* successfully queued. */ ++cbqp->cbq_qlen; IFQ_INC_LEN(ifq); return (0); } static struct mbuf * cbq_dequeue(struct ifaltq *ifq, int op) { cbq_state_t *cbqp = (cbq_state_t *)ifq->altq_disc; struct mbuf *m; m = rmc_dequeue_next(&cbqp->ifnp, op); if (m && op == ALTDQ_REMOVE) { --cbqp->cbq_qlen; /* decrement # of packets in cbq */ IFQ_DEC_LEN(ifq); /* Update the class. */ rmc_update_class_util(&cbqp->ifnp); } return (m); } /* * void * cbqrestart(queue_t *) - Restart sending of data. * called from rmc_restart in splnet via timeout after waking up * a suspended class. * Returns: NONE */ static void cbqrestart(struct ifaltq *ifq) { cbq_state_t *cbqp; struct ifnet *ifp; if (!ALTQ_IS_ENABLED(ifq)) /* cbq must have been detached */ return; if ((cbqp = (cbq_state_t *)ifq->altq_disc) == NULL) /* should not happen */ return; ifp = ifq->altq_ifp; if (ifp->if_start && cbqp->cbq_qlen > 0) if_start(ifp); } static void cbq_purge(cbq_state_t *cbqp) { struct rm_class *cl; int i; for (i = 0; i < CBQ_MAX_CLASSES; i++) if ((cl = cbqp->cbq_class_tbl[i]) != NULL) rmc_dropall(cl); if (ALTQ_IS_ENABLED(cbqp->ifnp.ifq_)) cbqp->ifnp.ifq_->ifq_len = 0; }