--- /dev/null
+/*
+ * Copyright (c) 2010 Riccardo Panicucci, Universita` di Pisa
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * $Id: dn_sched_prio.c 5797 2010-03-21 16:31:08Z luigi $
+ */
+#ifdef _KERNEL
+#include <sys/malloc.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/kernel.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <net/if.h> /* IFNAMSIZ */
+#include <netinet/in.h>
+#include <netinet/ip_var.h> /* ipfw_rule_ref */
+#include <netinet/ip_fw.h> /* flow_id */
+#include <netinet/ip_dummynet.h>
+#include <netinet/ipfw/dn_heap.h>
+#include <netinet/ipfw/ip_dn_private.h>
+#include <netinet/ipfw/dn_sched.h>
+#else
+#include <dn_test.h>
+#endif
+
+#define DN_SCHED_PRIO 5 //XXX
+
+#if !defined(_KERNEL) || !defined(__linux__)
+#define test_bit(ix, pData) ((*pData) & (1<<(ix)))
+#define __set_bit(ix, pData) (*pData) |= (1<<(ix))
+#define __clear_bit(ix, pData) (*pData) &= ~(1<<(ix))
+#endif
+
+#ifdef __MIPSEL__
+#define __clear_bit(ix, pData) (*pData) &= ~(1<<(ix))
+#endif
+
+/* Size of the array of queues pointers. */
+#define BITMAP_T unsigned long
+#define MAXPRIO (sizeof(BITMAP_T) * 8)
+
+/*
+ * The scheduler instance contains an array of pointers to queues,
+ * one for each priority, and a bitmap listing backlogged queues.
+ */
+struct prio_si {
+ BITMAP_T bitmap; /* array bitmap */
+ struct dn_queue *q_array[MAXPRIO]; /* Array of queues pointers */
+};
+
+/*
+ * If a queue with the same priority is already backlogged, use
+ * that one instead of the queue passed as argument.
+ */
+static int
+prio_enqueue(struct dn_sch_inst *_si, struct dn_queue *q, struct mbuf *m)
+{
+ struct prio_si *si = (struct prio_si *)(_si + 1);
+ int prio = q->fs->fs.par[0];
+
+ if (test_bit(prio, &si->bitmap) == 0) {
+ /* No queue with this priority, insert */
+ __set_bit(prio, &si->bitmap);
+ si->q_array[prio] = q;
+ } else { /* use the existing queue */
+ q = si->q_array[prio];
+ }
+ if (dn_enqueue(q, m, 0))
+ return 1;
+ return 0;
+}
+
+/*
+ * Packets are dequeued only from the highest priority queue.
+ * The function ffs() return the lowest bit in the bitmap that rapresent
+ * the array index (-1) which contains the pointer to the highest priority
+ * queue.
+ * After the dequeue, if this queue become empty, it is index is removed
+ * from the bitmap.
+ * Scheduler is idle if the bitmap is empty
+ *
+ * NOTE: highest priority is 0, lowest is sched->max_prio_q
+ */
+static struct mbuf *
+prio_dequeue(struct dn_sch_inst *_si)
+{
+ struct prio_si *si = (struct prio_si *)(_si + 1);
+ struct mbuf *m;
+ struct dn_queue *q;
+ int prio;
+
+ if (si->bitmap == 0) /* scheduler idle */
+ return NULL;
+
+ prio = ffs(si->bitmap) - 1;
+
+ /* Take the highest priority queue in the scheduler */
+ q = si->q_array[prio];
+ // assert(q)
+
+ m = dn_dequeue(q);
+ if (q->mq.head == NULL) {
+ /* Queue is now empty, remove from scheduler
+ * and mark it
+ */
+ si->q_array[prio] = NULL;
+ __clear_bit(prio, &si->bitmap);
+ }
+ return m;
+}
+
+static int
+prio_new_sched(struct dn_sch_inst *_si)
+{
+ struct prio_si *si = (struct prio_si *)(_si + 1);
+
+ bzero(si->q_array, sizeof(si->q_array));
+ si->bitmap = 0;
+
+ return 0;
+}
+
+static int
+prio_new_fsk(struct dn_fsk *fs)
+{
+ /* Check if the prioritiy is between 0 and MAXPRIO-1 */
+ ipdn_bound_var(&fs->fs.par[0], 0, 0, MAXPRIO - 1, "PRIO priority");
+ return 0;
+}
+
+static int
+prio_new_queue(struct dn_queue *q)
+{
+ struct prio_si *si = (struct prio_si *)(q->_si + 1);
+ int prio = q->fs->fs.par[0];
+ struct dn_queue *oldq;
+
+ q->ni.oid.subtype = DN_SCHED_PRIO;
+
+ if (q->mq.head == NULL)
+ return 0;
+
+ /* Queue already full, must insert in the scheduler or append
+ * mbufs to existing queue. This partly duplicates prio_enqueue
+ */
+ if (test_bit(prio, &si->bitmap) == 0) {
+ /* No queue with this priority, insert */
+ __set_bit(prio, &si->bitmap);
+ si->q_array[prio] = q;
+ } else if ( (oldq = si->q_array[prio]) != q) {
+ /* must append to the existing queue.
+ * can simply append q->mq.head to q2->...
+ * and add the counters to those of q2
+ */
+ oldq->mq.tail->m_nextpkt = q->mq.head;
+ oldq->mq.tail = q->mq.tail;
+ oldq->ni.length += q->ni.length;
+ q->ni.length = 0;
+ oldq->ni.len_bytes += q->ni.len_bytes;
+ q->ni.len_bytes = 0;
+ q->mq.tail = q->mq.head = NULL;
+ }
+ return 0;
+}
+
+static int
+prio_free_queue(struct dn_queue *q)
+{
+ int prio = q->fs->fs.par[0];
+ struct prio_si *si = (struct prio_si *)(q->_si + 1);
+
+ if (si->q_array[prio] == q) {
+ si->q_array[prio] = NULL;
+ __clear_bit(prio, &si->bitmap);
+ }
+ return 0;
+}
+
+
+static struct dn_alg prio_desc = {
+ _SI( .type = ) DN_SCHED_PRIO,
+ _SI( .name = ) "PRIO",
+ _SI( .flags = ) DN_MULTIQUEUE,
+
+ /* we need extra space in the si and the queue */
+ _SI( .schk_datalen = ) 0,
+ _SI( .si_datalen = ) sizeof(struct prio_si),
+ _SI( .q_datalen = ) 0,
+
+ _SI( .enqueue = ) prio_enqueue,
+ _SI( .dequeue = ) prio_dequeue,
+
+ _SI( .config = ) NULL,
+ _SI( .destroy = ) NULL,
+ _SI( .new_sched = ) prio_new_sched,
+ _SI( .free_sched = ) NULL,
+
+ _SI( .new_fsk = ) prio_new_fsk,
+ _SI( .free_fsk = ) NULL,
+
+ _SI( .new_queue = ) prio_new_queue,
+ _SI( .free_queue = ) prio_free_queue,
+};
+
+
+DECLARE_DNSCHED_MODULE(dn_prio, &prio_desc);
git://git.onelab.eu / ipfw.git / blobdiff