236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/*
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* Copyright (c) 2010 Riccardo Panicucci, Universita` di Pisa
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* $FreeBSD$
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*/
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#ifdef _KERNEL
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#include <sys/malloc.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <net/if.h> /* IFNAMSIZ */
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#include <netinet/in.h>
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#include <netinet/ip_var.h> /* ipfw_rule_ref */
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#include <netinet/ip_fw.h> /* flow_id */
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#include <netinet/ip_dummynet.h>
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#include <netpfil/ipfw/dn_heap.h>
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#include <netpfil/ipfw/ip_dn_private.h>
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#ifdef NEW_AQM
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#include <netpfil/ipfw/dn_aqm.h>
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#endif
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#include <netpfil/ipfw/dn_sched.h>
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#else
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#include <dn_test.h>
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#endif
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#define DN_SCHED_PRIO 5 //XXX
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#if !defined(_KERNEL) || !defined(__linux__)
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#define test_bit(ix, pData) ((*pData) & (1<<(ix)))
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#define __set_bit(ix, pData) (*pData) |= (1<<(ix))
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#define __clear_bit(ix, pData) (*pData) &= ~(1<<(ix))
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#endif
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#ifdef __MIPSEL__
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#define __clear_bit(ix, pData) (*pData) &= ~(1<<(ix))
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#endif
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/* Size of the array of queues pointers. */
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#define BITMAP_T unsigned long
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#define MAXPRIO (sizeof(BITMAP_T) * 8)
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/*
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* The scheduler instance contains an array of pointers to queues,
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* one for each priority, and a bitmap listing backlogged queues.
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*/
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struct prio_si {
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BITMAP_T bitmap; /* array bitmap */
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struct dn_queue *q_array[MAXPRIO]; /* Array of queues pointers */
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};
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/*
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* If a queue with the same priority is already backlogged, use
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* that one instead of the queue passed as argument.
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*/
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static int
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prio_enqueue(struct dn_sch_inst *_si, struct dn_queue *q, struct mbuf *m)
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{
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struct prio_si *si = (struct prio_si *)(_si + 1);
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int prio = q->fs->fs.par[0];
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if (test_bit(prio, &si->bitmap) == 0) {
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/* No queue with this priority, insert */
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__set_bit(prio, &si->bitmap);
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si->q_array[prio] = q;
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} else { /* use the existing queue */
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q = si->q_array[prio];
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}
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if (dn_enqueue(q, m, 0))
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return 1;
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return 0;
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}
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/*
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* Packets are dequeued only from the highest priority queue.
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* The function ffs() return the lowest bit in the bitmap that rapresent
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* the array index (-1) which contains the pointer to the highest priority
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* queue.
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* After the dequeue, if this queue become empty, it is index is removed
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* from the bitmap.
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* Scheduler is idle if the bitmap is empty
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*
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* NOTE: highest priority is 0, lowest is sched->max_prio_q
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*/
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static struct mbuf *
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prio_dequeue(struct dn_sch_inst *_si)
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{
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struct prio_si *si = (struct prio_si *)(_si + 1);
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struct mbuf *m;
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struct dn_queue *q;
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int prio;
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if (si->bitmap == 0) /* scheduler idle */
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return NULL;
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prio = ffs(si->bitmap) - 1;
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/* Take the highest priority queue in the scheduler */
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q = si->q_array[prio];
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// assert(q)
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m = dn_dequeue(q);
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if (q->mq.head == NULL) {
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/* Queue is now empty, remove from scheduler
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* and mark it
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*/
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si->q_array[prio] = NULL;
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__clear_bit(prio, &si->bitmap);
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}
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return m;
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}
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static int
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prio_new_sched(struct dn_sch_inst *_si)
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{
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struct prio_si *si = (struct prio_si *)(_si + 1);
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bzero(si->q_array, sizeof(si->q_array));
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si->bitmap = 0;
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return 0;
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}
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static int
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prio_new_fsk(struct dn_fsk *fs)
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{
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/* Check if the prioritiy is between 0 and MAXPRIO-1 */
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ipdn_bound_var(&fs->fs.par[0], 0, 0, MAXPRIO - 1, "PRIO priority");
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return 0;
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}
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static int
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prio_new_queue(struct dn_queue *q)
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{
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struct prio_si *si = (struct prio_si *)(q->_si + 1);
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int prio = q->fs->fs.par[0];
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struct dn_queue *oldq;
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q->ni.oid.subtype = DN_SCHED_PRIO;
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if (q->mq.head == NULL)
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return 0;
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/* Queue already full, must insert in the scheduler or append
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* mbufs to existing queue. This partly duplicates prio_enqueue
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*/
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if (test_bit(prio, &si->bitmap) == 0) {
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/* No queue with this priority, insert */
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__set_bit(prio, &si->bitmap);
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si->q_array[prio] = q;
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} else if ( (oldq = si->q_array[prio]) != q) {
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/* must append to the existing queue.
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* can simply append q->mq.head to q2->...
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* and add the counters to those of q2
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*/
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oldq->mq.tail->m_nextpkt = q->mq.head;
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oldq->mq.tail = q->mq.tail;
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oldq->ni.length += q->ni.length;
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q->ni.length = 0;
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oldq->ni.len_bytes += q->ni.len_bytes;
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q->ni.len_bytes = 0;
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q->mq.tail = q->mq.head = NULL;
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}
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return 0;
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}
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static int
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prio_free_queue(struct dn_queue *q)
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{
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int prio = q->fs->fs.par[0];
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struct prio_si *si = (struct prio_si *)(q->_si + 1);
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if (si->q_array[prio] == q) {
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si->q_array[prio] = NULL;
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__clear_bit(prio, &si->bitmap);
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}
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return 0;
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}
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static struct dn_alg prio_desc = {
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_SI( .type = ) DN_SCHED_PRIO,
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_SI( .name = ) "PRIO",
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_SI( .flags = ) DN_MULTIQUEUE,
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/* we need extra space in the si and the queue */
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_SI( .schk_datalen = ) 0,
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_SI( .si_datalen = ) sizeof(struct prio_si),
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_SI( .q_datalen = ) 0,
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_SI( .enqueue = ) prio_enqueue,
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_SI( .dequeue = ) prio_dequeue,
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_SI( .config = ) NULL,
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_SI( .destroy = ) NULL,
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_SI( .new_sched = ) prio_new_sched,
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_SI( .free_sched = ) NULL,
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_SI( .new_fsk = ) prio_new_fsk,
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_SI( .free_fsk = ) NULL,
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_SI( .new_queue = ) prio_new_queue,
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_SI( .free_queue = ) prio_free_queue,
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#ifdef NEW_AQM
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_SI( .getconfig = ) NULL,
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#endif
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};
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DECLARE_DNSCHED_MODULE(dn_prio, &prio_desc);
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