1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010 Riccardo Panicucci, Universita` di Pisa
5 * All rights reserved
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * $FreeBSD$
31 */
32 #ifdef _KERNEL
33 #include <sys/malloc.h>
34 #include <sys/socket.h>
35 #include <sys/socketvar.h>
36 #include <sys/kernel.h>
37 #include <sys/lock.h>
38 #include <sys/mbuf.h>
39 #include <sys/module.h>
40 #include <sys/rwlock.h>
41 #include <net/if.h> /* IFNAMSIZ */
42 #include <netinet/in.h>
43 #include <netinet/ip_var.h> /* ipfw_rule_ref */
44 #include <netinet/ip_fw.h> /* flow_id */
45 #include <netinet/ip_dummynet.h>
46 #include <netpfil/ipfw/ip_fw_private.h>
47 #include <netpfil/ipfw/dn_heap.h>
48 #include <netpfil/ipfw/ip_dn_private.h>
49 #ifdef NEW_AQM
50 #include <netpfil/ipfw/dn_aqm.h>
51 #endif
52 #include <netpfil/ipfw/dn_sched.h>
53 #else
54 #include <dn_test.h>
55 #endif
56
57 #define DN_SCHED_PRIO 5 //XXX
58
59 #if !defined(_KERNEL) || !defined(__linux__)
60 #define test_bit(ix, pData) ((*pData) & (1<<(ix)))
61 #define __set_bit(ix, pData) (*pData) |= (1<<(ix))
62 #define __clear_bit(ix, pData) (*pData) &= ~(1<<(ix))
63 #endif
64
65 #ifdef __MIPSEL__
66 #define __clear_bit(ix, pData) (*pData) &= ~(1<<(ix))
67 #endif
68
69 /* Size of the array of queues pointers. */
70 #define BITMAP_T unsigned long
71 #define MAXPRIO (sizeof(BITMAP_T) * 8)
72
73 /*
74 * The scheduler instance contains an array of pointers to queues,
75 * one for each priority, and a bitmap listing backlogged queues.
76 */
77 struct prio_si {
78 BITMAP_T bitmap; /* array bitmap */
79 struct dn_queue *q_array[MAXPRIO]; /* Array of queues pointers */
80 };
81
82 /*
83 * If a queue with the same priority is already backlogged, use
84 * that one instead of the queue passed as argument.
85 */
86 static int
87 prio_enqueue(struct dn_sch_inst *_si, struct dn_queue *q, struct mbuf *m)
88 {
89 struct prio_si *si = (struct prio_si *)(_si + 1);
90 int prio = q->fs->fs.par[0];
91
92 if (test_bit(prio, &si->bitmap) == 0) {
93 /* No queue with this priority, insert */
94 __set_bit(prio, &si->bitmap);
95 si->q_array[prio] = q;
96 } else { /* use the existing queue */
97 q = si->q_array[prio];
98 }
99 if (dn_enqueue(q, m, 0))
100 return 1;
101 return 0;
102 }
103
104 /*
105 * Packets are dequeued only from the highest priority queue.
106 * The function ffs() return the lowest bit in the bitmap that rapresent
107 * the array index (-1) which contains the pointer to the highest priority
108 * queue.
109 * After the dequeue, if this queue become empty, it is index is removed
110 * from the bitmap.
111 * Scheduler is idle if the bitmap is empty
112 *
113 * NOTE: highest priority is 0, lowest is sched->max_prio_q
114 */
115 static struct mbuf *
116 prio_dequeue(struct dn_sch_inst *_si)
117 {
118 struct prio_si *si = (struct prio_si *)(_si + 1);
119 struct mbuf *m;
120 struct dn_queue *q;
121 int prio;
122
123 if (si->bitmap == 0) /* scheduler idle */
124 return NULL;
125
126 prio = ffs(si->bitmap) - 1;
127
128 /* Take the highest priority queue in the scheduler */
129 q = si->q_array[prio];
130 // assert(q)
131
132 m = dn_dequeue(q);
133 if (q->mq.head == NULL) {
134 /* Queue is now empty, remove from scheduler
135 * and mark it
136 */
137 si->q_array[prio] = NULL;
138 __clear_bit(prio, &si->bitmap);
139 }
140 return m;
141 }
142
143 static int
144 prio_new_sched(struct dn_sch_inst *_si)
145 {
146 struct prio_si *si = (struct prio_si *)(_si + 1);
147
148 bzero(si->q_array, sizeof(si->q_array));
149 si->bitmap = 0;
150
151 return 0;
152 }
153
154 static int
155 prio_new_fsk(struct dn_fsk *fs)
156 {
157 /* Check if the prioritiy is between 0 and MAXPRIO-1 */
158 ipdn_bound_var(&fs->fs.par[0], 0, 0, MAXPRIO - 1, "PRIO priority");
159 return 0;
160 }
161
162 static int
163 prio_new_queue(struct dn_queue *q)
164 {
165 struct prio_si *si = (struct prio_si *)(q->_si + 1);
166 int prio = q->fs->fs.par[0];
167 struct dn_queue *oldq;
168
169 q->ni.oid.subtype = DN_SCHED_PRIO;
170
171 if (q->mq.head == NULL)
172 return 0;
173
174 /* Queue already full, must insert in the scheduler or append
175 * mbufs to existing queue. This partly duplicates prio_enqueue
176 */
177 if (test_bit(prio, &si->bitmap) == 0) {
178 /* No queue with this priority, insert */
179 __set_bit(prio, &si->bitmap);
180 si->q_array[prio] = q;
181 } else if ( (oldq = si->q_array[prio]) != q) {
182 /* must append to the existing queue.
183 * can simply append q->mq.head to q2->...
184 * and add the counters to those of q2
185 */
186 oldq->mq.tail->m_nextpkt = q->mq.head;
187 oldq->mq.tail = q->mq.tail;
188 oldq->ni.length += q->ni.length;
189 q->ni.length = 0;
190 oldq->ni.len_bytes += q->ni.len_bytes;
191 q->ni.len_bytes = 0;
192 q->mq.tail = q->mq.head = NULL;
193 }
194 return 0;
195 }
196
197 static int
198 prio_free_queue(struct dn_queue *q)
199 {
200 int prio = q->fs->fs.par[0];
201 struct prio_si *si = (struct prio_si *)(q->_si + 1);
202
203 if (si->q_array[prio] == q) {
204 si->q_array[prio] = NULL;
205 __clear_bit(prio, &si->bitmap);
206 }
207 return 0;
208 }
209
210 static struct dn_alg prio_desc = {
211 _SI( .type = ) DN_SCHED_PRIO,
212 _SI( .name = ) "PRIO",
213 _SI( .flags = ) DN_MULTIQUEUE,
214
215 /* we need extra space in the si and the queue */
216 _SI( .schk_datalen = ) 0,
217 _SI( .si_datalen = ) sizeof(struct prio_si),
218 _SI( .q_datalen = ) 0,
219
220 _SI( .enqueue = ) prio_enqueue,
221 _SI( .dequeue = ) prio_dequeue,
222
223 _SI( .config = ) NULL,
224 _SI( .destroy = ) NULL,
225 _SI( .new_sched = ) prio_new_sched,
226 _SI( .free_sched = ) NULL,
227
228 _SI( .new_fsk = ) prio_new_fsk,
229 _SI( .free_fsk = ) NULL,
230
231 _SI( .new_queue = ) prio_new_queue,
232 _SI( .free_queue = ) prio_free_queue,
233 #ifdef NEW_AQM
234 _SI( .getconfig = ) NULL,
235 #endif
236 };
237
238 DECLARE_DNSCHED_MODULE(dn_prio, &prio_desc);
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