2 * Copyright (c) 2005 The DragonFly Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
14 * 3. Neither the name of The DragonFly Project nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific, prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $DragonFly: src/sys/net/ifq_var.h,v 1.10 2008/05/14 11:59:23 sephe Exp $
34 * NOTE ON MPSAFE access. Routines which manipulate the packet queue must
35 * be called within a critical section to interlock subsystems based on
36 * the MP lock, and must be holding the interface serializer to interlock
37 * MPSAFE subsystems. Once all subsystems are made MPSAFE, the critical
38 * section will no longer be required.
41 #ifndef _NET_IFQ_VAR_H_
42 #define _NET_IFQ_VAR_H_
46 #error "This file should not be included by userland programs."
51 #include <sys/systm.h>
53 #ifndef _SYS_THREAD2_H_
54 #include <sys/thread2.h>
56 #ifndef _SYS_SERIALIZE_H_
57 #include <sys/serialize.h>
62 #ifndef _NET_IF_VAR_H_
63 #include <net/if_var.h>
65 #ifndef _NET_ALTQ_IF_ALTQ_H_
66 #include <net/altq/if_altq.h>
72 * Support for non-ALTQ interfaces.
74 int ifq_classic_enqueue(struct ifaltq *, struct mbuf *,
75 struct altq_pktattr *);
76 struct mbuf *ifq_classic_dequeue(struct ifaltq *, struct mbuf *, int);
77 int ifq_classic_request(struct ifaltq *, int, void *);
78 void ifq_set_classic(struct ifaltq *);
80 int ifq_dispatch(struct ifnet *, struct mbuf *,
81 struct altq_pktattr *);
85 ifq_is_enabled(struct ifaltq *_ifq)
87 return(_ifq->altq_flags & ALTQF_ENABLED);
91 ifq_is_attached(struct ifaltq *_ifq)
93 return(_ifq->altq_disc != NULL);
97 ifq_is_enabled(struct ifaltq *_ifq)
103 ifq_is_attached(struct ifaltq *_ifq)
110 * WARNING: Should only be called in an MPSAFE manner.
113 ifq_is_ready(struct ifaltq *_ifq)
115 return(_ifq->altq_flags & ALTQF_READY);
119 * WARNING: Should only be called in an MPSAFE manner.
122 ifq_set_ready(struct ifaltq *_ifq)
124 _ifq->altq_flags |= ALTQF_READY;
128 * WARNING: Should only be called in an MPSAFE manner.
131 ifq_enqueue_locked(struct ifaltq *_ifq, struct mbuf *_m,
132 struct altq_pktattr *_pa)
135 if (!ifq_is_enabled(_ifq))
136 return ifq_classic_enqueue(_ifq, _m, _pa);
139 return _ifq->altq_enqueue(_ifq, _m, _pa);
143 ifq_enqueue(struct ifaltq *_ifq, struct mbuf *_m, struct altq_pktattr *_pa)
148 _error = ifq_enqueue_locked(_ifq, _m, _pa);
154 * WARNING: Should only be called in an MPSAFE manner.
156 static __inline struct mbuf *
157 ifq_dequeue(struct ifaltq *_ifq, struct mbuf *_mpolled)
162 if (_ifq->altq_prepended != NULL) {
163 _m = _ifq->altq_prepended;
164 _ifq->altq_prepended = NULL;
165 KKASSERT(_ifq->ifq_len > 0);
172 if (_ifq->altq_tbr != NULL)
173 _m = tbr_dequeue(_ifq, _mpolled, ALTDQ_REMOVE);
174 else if (!ifq_is_enabled(_ifq))
175 _m = ifq_classic_dequeue(_ifq, _mpolled, ALTDQ_REMOVE);
178 _m = _ifq->altq_dequeue(_ifq, _mpolled, ALTDQ_REMOVE);
184 * WARNING: Should only be called in an MPSAFE manner.
186 static __inline struct mbuf *
187 ifq_poll_locked(struct ifaltq *_ifq)
189 if (_ifq->altq_prepended != NULL)
190 return _ifq->altq_prepended;
193 if (_ifq->altq_tbr != NULL)
194 return tbr_dequeue(_ifq, NULL, ALTDQ_POLL);
195 else if (!ifq_is_enabled(_ifq))
196 return ifq_classic_dequeue(_ifq, NULL, ALTDQ_POLL);
199 return _ifq->altq_dequeue(_ifq, NULL, ALTDQ_POLL);
202 static __inline struct mbuf *
203 ifq_poll(struct ifaltq *_ifq)
208 _m = ifq_poll_locked(_ifq);
214 * WARNING: Should only be called in an MPSAFE manner.
217 ifq_purge_locked(struct ifaltq *_ifq)
219 if (_ifq->altq_prepended != NULL) {
220 m_freem(_ifq->altq_prepended);
221 _ifq->altq_prepended = NULL;
222 KKASSERT(_ifq->ifq_len > 0);
227 if (!ifq_is_enabled(_ifq))
228 ifq_classic_request(_ifq, ALTRQ_PURGE, NULL);
231 _ifq->altq_request(_ifq, ALTRQ_PURGE, NULL);
235 ifq_purge(struct ifaltq *_ifq)
238 ifq_purge_locked(_ifq);
243 * WARNING: Should only be called in an MPSAFE manner.
246 ifq_classify(struct ifaltq *_ifq, struct mbuf *_m, uint8_t _af,
247 struct altq_pktattr *_pa)
251 if (ifq_is_enabled(_ifq)) {
253 _pa->pattr_hdr = mtod(_m, caddr_t);
254 if (_ifq->altq_flags & ALTQF_CLASSIFY)
255 _ifq->altq_classify(_ifq, _m, _pa);
262 ifq_prepend(struct ifaltq *_ifq, struct mbuf *_m)
265 KASSERT(_ifq->altq_prepended == NULL, ("pending prepended mbuf\n"));
266 _ifq->altq_prepended = _m;
272 * Hand a packet to an interface.
274 * For subsystems protected by the MP lock, access to the queue is protected
275 * by a critical section.
277 * For MPSAFE subsystems and drivers, access to the queue is protected by
278 * the ifnet serializer.
281 ifq_handoff(struct ifnet *_ifp, struct mbuf *_m, struct altq_pktattr *_pa)
285 ASSERT_IFNET_SERIALIZED_TX(_ifp);
286 _error = ifq_enqueue(&_ifp->if_snd, _m, _pa);
288 _ifp->if_obytes += _m->m_pkthdr.len;
289 if (_m->m_flags & M_MCAST)
291 if ((_ifp->if_flags & IFF_OACTIVE) == 0)
292 (*_ifp->if_start)(_ifp);
298 ifq_is_empty(struct ifaltq *_ifq)
300 return(_ifq->ifq_len == 0);
304 ifq_set_maxlen(struct ifaltq *_ifq, int _len)
306 _ifq->ifq_maxlen = _len;
310 ifq_data_ready(struct ifaltq *_ifq)
313 if (_ifq->altq_tbr != NULL)
314 return (ifq_poll_locked(_ifq) != NULL);
317 return !ifq_is_empty(_ifq);
321 #endif /* _NET_IFQ_VAR_H_ */