^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * net/sched/sch_fifo.c The simplest FIFO queue.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <net/pkt_sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <net/pkt_cls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) /* 1 band FIFO pseudo-"scheduler" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) static int bfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) struct sk_buff **to_free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) if (likely(sch->qstats.backlog + qdisc_pkt_len(skb) <= sch->limit))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) return qdisc_enqueue_tail(skb, sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) return qdisc_drop(skb, sch, to_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int pfifo_enqueue(struct sk_buff *skb, struct Qdisc *sch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct sk_buff **to_free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (likely(sch->q.qlen < sch->limit))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return qdisc_enqueue_tail(skb, sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return qdisc_drop(skb, sch, to_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static int pfifo_tail_enqueue(struct sk_buff *skb, struct Qdisc *sch,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct sk_buff **to_free)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned int prev_backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) if (likely(sch->q.qlen < sch->limit))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) return qdisc_enqueue_tail(skb, sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) prev_backlog = sch->qstats.backlog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /* queue full, remove one skb to fulfill the limit */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) __qdisc_queue_drop_head(sch, &sch->q, to_free);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) qdisc_qstats_drop(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) qdisc_enqueue_tail(skb, sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) qdisc_tree_reduce_backlog(sch, 0, prev_backlog - sch->qstats.backlog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return NET_XMIT_CN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static void fifo_offload_init(struct Qdisc *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct net_device *dev = qdisc_dev(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct tc_fifo_qopt_offload qopt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) qopt.command = TC_FIFO_REPLACE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) qopt.handle = sch->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) qopt.parent = sch->parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_FIFO, &qopt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static void fifo_offload_destroy(struct Qdisc *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct net_device *dev = qdisc_dev(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct tc_fifo_qopt_offload qopt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!tc_can_offload(dev) || !dev->netdev_ops->ndo_setup_tc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) qopt.command = TC_FIFO_DESTROY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) qopt.handle = sch->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) qopt.parent = sch->parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_QDISC_FIFO, &qopt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) static int fifo_offload_dump(struct Qdisc *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct tc_fifo_qopt_offload qopt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) qopt.command = TC_FIFO_STATS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) qopt.handle = sch->handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) qopt.parent = sch->parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) qopt.stats.bstats = &sch->bstats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) qopt.stats.qstats = &sch->qstats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) return qdisc_offload_dump_helper(sch, TC_SETUP_QDISC_FIFO, &qopt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) static int __fifo_init(struct Qdisc *sch, struct nlattr *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) bool bypass;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) bool is_bfifo = sch->ops == &bfifo_qdisc_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (opt == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) u32 limit = qdisc_dev(sch)->tx_queue_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (is_bfifo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) limit *= psched_mtu(qdisc_dev(sch));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) sch->limit = limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) struct tc_fifo_qopt *ctl = nla_data(opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (nla_len(opt) < sizeof(*ctl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) sch->limit = ctl->limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) if (is_bfifo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) bypass = sch->limit >= psched_mtu(qdisc_dev(sch));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) bypass = sch->limit >= 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (bypass)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) sch->flags |= TCQ_F_CAN_BYPASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) sch->flags &= ~TCQ_F_CAN_BYPASS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static int fifo_init(struct Qdisc *sch, struct nlattr *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) err = __fifo_init(sch, opt, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) fifo_offload_init(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static int fifo_hd_init(struct Qdisc *sch, struct nlattr *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return __fifo_init(sch, opt, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static void fifo_destroy(struct Qdisc *sch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) fifo_offload_destroy(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static int __fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct tc_fifo_qopt opt = { .limit = sch->limit };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (nla_put(skb, TCA_OPTIONS, sizeof(opt), &opt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) nla_put_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int fifo_dump(struct Qdisc *sch, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) err = fifo_offload_dump(sch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return __fifo_dump(sch, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static int fifo_hd_dump(struct Qdisc *sch, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return __fifo_dump(sch, skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct Qdisc_ops pfifo_qdisc_ops __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) .id = "pfifo",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) .priv_size = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) .enqueue = pfifo_enqueue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) .dequeue = qdisc_dequeue_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) .peek = qdisc_peek_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) .init = fifo_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .destroy = fifo_destroy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .reset = qdisc_reset_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .change = fifo_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .dump = fifo_dump,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) EXPORT_SYMBOL(pfifo_qdisc_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct Qdisc_ops bfifo_qdisc_ops __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .id = "bfifo",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) .priv_size = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) .enqueue = bfifo_enqueue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) .dequeue = qdisc_dequeue_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) .peek = qdisc_peek_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) .init = fifo_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) .destroy = fifo_destroy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) .reset = qdisc_reset_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) .change = fifo_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) .dump = fifo_dump,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) EXPORT_SYMBOL(bfifo_qdisc_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) struct Qdisc_ops pfifo_head_drop_qdisc_ops __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) .id = "pfifo_head_drop",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) .priv_size = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) .enqueue = pfifo_tail_enqueue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) .dequeue = qdisc_dequeue_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) .peek = qdisc_peek_head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) .init = fifo_hd_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) .reset = qdisc_reset_queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) .change = fifo_hd_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) .dump = fifo_hd_dump,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) /* Pass size change message down to embedded FIFO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) int fifo_set_limit(struct Qdisc *q, unsigned int limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct nlattr *nla;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) int ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /* Hack to avoid sending change message to non-FIFO */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (strncmp(q->ops->id + 1, "fifo", 4) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (!q->ops->change)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) nla = kmalloc(nla_attr_size(sizeof(struct tc_fifo_qopt)), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) if (nla) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) nla->nla_type = RTM_NEWQDISC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) nla->nla_len = nla_attr_size(sizeof(struct tc_fifo_qopt));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) ((struct tc_fifo_qopt *)nla_data(nla))->limit = limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) ret = q->ops->change(q, nla, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) kfree(nla);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) EXPORT_SYMBOL(fifo_set_limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) unsigned int limit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) struct Qdisc *q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) q = qdisc_create_dflt(sch->dev_queue, ops, TC_H_MAKE(sch->handle, 1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) if (q) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) err = fifo_set_limit(q, limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) qdisc_put(q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) q = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return q ? : ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) EXPORT_SYMBOL(fifo_create_dflt);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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