1/* 2 * Copyright (c) 2010 Riccardo Panicucci, Universita` di Pisa 3 * All rights reserved 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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 the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27/* 28 * $FreeBSD: stable/10/sys/netpfil/ipfw/dn_sched_fifo.c 325731 2017-11-12 01:28:20Z truckman $ 29 */ 30 31#ifdef _KERNEL 32#include <sys/malloc.h> 33#include <sys/socket.h> 34#include <sys/socketvar.h> 35#include <sys/kernel.h> 36#include <sys/lock.h> 37#include <sys/mbuf.h> 38#include <sys/module.h> 39#include <sys/rwlock.h> 40#include <net/if.h> /* IFNAMSIZ */ 41#include <netinet/in.h> 42#include <netinet/ip_var.h> /* ipfw_rule_ref */ 43#include <netinet/ip_fw.h> /* flow_id */ 44#include <netinet/ip_dummynet.h> 45#include <netpfil/ipfw/ip_fw_private.h> 46#include <netpfil/ipfw/dn_heap.h> 47#include <netpfil/ipfw/ip_dn_private.h> 48#ifdef NEW_AQM 49#include <netpfil/ipfw/dn_aqm.h> 50#endif 51#include <netpfil/ipfw/dn_sched.h> 52#else 53#include <dn_test.h> 54#endif 55 56/* 57 * This file implements a FIFO scheduler for a single queue. 58 * The queue is allocated as part of the scheduler instance, 59 * and there is a single flowset is in the template which stores 60 * queue size and policy. 61 * Enqueue and dequeue use the default library functions. 62 */ 63static int 64fifo_enqueue(struct dn_sch_inst *si, struct dn_queue *q, struct mbuf *m) 65{ 66 /* XXX if called with q != NULL and m=NULL, this is a 67 * re-enqueue from an existing scheduler, which we should 68 * handle. 69 */ 70 return dn_enqueue((struct dn_queue *)(si+1), m, 0); 71} 72 73static struct mbuf * 74fifo_dequeue(struct dn_sch_inst *si) 75{ 76 return dn_dequeue((struct dn_queue *)(si + 1)); 77} 78 79static int 80fifo_new_sched(struct dn_sch_inst *si) 81{ 82 /* This scheduler instance contains the queue */ 83 struct dn_queue *q = (struct dn_queue *)(si + 1); 84 85 set_oid(&q->ni.oid, DN_QUEUE, sizeof(*q)); 86 q->_si = si; 87 q->fs = si->sched->fs; 88 return 0; 89} 90 91static int 92fifo_free_sched(struct dn_sch_inst *si) 93{ 94 struct dn_queue *q = (struct dn_queue *)(si + 1); 95 dn_free_pkts(q->mq.head); 96 bzero(q, sizeof(*q)); 97 return 0; 98} 99 100/* 101 * FIFO scheduler descriptor 102 * contains the type of the scheduler, the name, the size of extra 103 * data structures, and function pointers. 104 */ 105static struct dn_alg fifo_desc = { 106 _SI( .type = ) DN_SCHED_FIFO, 107 _SI( .name = ) "FIFO", 108 _SI( .flags = ) 0, 109 110 _SI( .schk_datalen = ) 0, 111 _SI( .si_datalen = ) sizeof(struct dn_queue), 112 _SI( .q_datalen = ) 0, 113 114 _SI( .enqueue = ) fifo_enqueue, 115 _SI( .dequeue = ) fifo_dequeue, 116 _SI( .config = ) NULL, 117 _SI( .destroy = ) NULL, 118 _SI( .new_sched = ) fifo_new_sched, 119 _SI( .free_sched = ) fifo_free_sched, 120 _SI( .new_fsk = ) NULL, 121 _SI( .free_fsk = ) NULL, 122 _SI( .new_queue = ) NULL, 123 _SI( .free_queue = ) NULL, 124#ifdef NEW_AQM 125 _SI( .getconfig = ) NULL, 126#endif 127}; 128 129DECLARE_DNSCHED_MODULE(dn_fifo, &fifo_desc); 130