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29b86cdac0
sch_direct_xmit() uses qdisc_qlen as a return value but all call sites of the routine only check if it is zero or not. Simplify the logic so that we don't need to return an actual queue length value. This introduces a case now where sch_direct_xmit would have returned a qlen of zero but now it returns true. However in this case all call sites of sch_direct_xmit will implement a dequeue() and get a null skb and abort. This trades tracking qlen in the hotpath for an extra dequeue operation. Overall this seems to be good for performance. Signed-off-by: John Fastabend <john.fastabend@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
156 lines
4.1 KiB
C
156 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NET_PKT_SCHED_H
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#define __NET_PKT_SCHED_H
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#include <linux/jiffies.h>
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#include <linux/ktime.h>
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#include <linux/if_vlan.h>
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#include <linux/netdevice.h>
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#include <net/sch_generic.h>
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#include <net/net_namespace.h>
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#include <uapi/linux/pkt_sched.h>
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#define DEFAULT_TX_QUEUE_LEN 1000
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struct qdisc_walker {
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int stop;
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int skip;
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int count;
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int (*fn)(struct Qdisc *, unsigned long cl, struct qdisc_walker *);
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};
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#define QDISC_ALIGNTO 64
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#define QDISC_ALIGN(len) (((len) + QDISC_ALIGNTO-1) & ~(QDISC_ALIGNTO-1))
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static inline void *qdisc_priv(struct Qdisc *q)
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{
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return (char *) q + QDISC_ALIGN(sizeof(struct Qdisc));
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}
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/*
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Timer resolution MUST BE < 10% of min_schedulable_packet_size/bandwidth
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Normal IP packet size ~ 512byte, hence:
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0.5Kbyte/1Mbyte/sec = 0.5msec, so that we need 50usec timer for
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10Mbit ethernet.
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10msec resolution -> <50Kbit/sec.
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The result: [34]86 is not good choice for QoS router :-(
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The things are not so bad, because we may use artificial
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clock evaluated by integration of network data flow
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in the most critical places.
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*/
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typedef u64 psched_time_t;
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typedef long psched_tdiff_t;
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/* Avoid doing 64 bit divide */
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#define PSCHED_SHIFT 6
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#define PSCHED_TICKS2NS(x) ((s64)(x) << PSCHED_SHIFT)
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#define PSCHED_NS2TICKS(x) ((x) >> PSCHED_SHIFT)
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#define PSCHED_TICKS_PER_SEC PSCHED_NS2TICKS(NSEC_PER_SEC)
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#define PSCHED_PASTPERFECT 0
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static inline psched_time_t psched_get_time(void)
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{
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return PSCHED_NS2TICKS(ktime_get_ns());
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}
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static inline psched_tdiff_t
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psched_tdiff_bounded(psched_time_t tv1, psched_time_t tv2, psched_time_t bound)
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{
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return min(tv1 - tv2, bound);
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}
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struct qdisc_watchdog {
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u64 last_expires;
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struct hrtimer timer;
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struct Qdisc *qdisc;
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};
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void qdisc_watchdog_init(struct qdisc_watchdog *wd, struct Qdisc *qdisc);
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void qdisc_watchdog_schedule_ns(struct qdisc_watchdog *wd, u64 expires);
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static inline void qdisc_watchdog_schedule(struct qdisc_watchdog *wd,
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psched_time_t expires)
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{
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qdisc_watchdog_schedule_ns(wd, PSCHED_TICKS2NS(expires));
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}
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void qdisc_watchdog_cancel(struct qdisc_watchdog *wd);
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extern struct Qdisc_ops pfifo_qdisc_ops;
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extern struct Qdisc_ops bfifo_qdisc_ops;
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extern struct Qdisc_ops pfifo_head_drop_qdisc_ops;
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int fifo_set_limit(struct Qdisc *q, unsigned int limit);
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struct Qdisc *fifo_create_dflt(struct Qdisc *sch, struct Qdisc_ops *ops,
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unsigned int limit);
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int register_qdisc(struct Qdisc_ops *qops);
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int unregister_qdisc(struct Qdisc_ops *qops);
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void qdisc_get_default(char *id, size_t len);
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int qdisc_set_default(const char *id);
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void qdisc_hash_add(struct Qdisc *q, bool invisible);
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void qdisc_hash_del(struct Qdisc *q);
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struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle);
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struct Qdisc *qdisc_lookup_class(struct net_device *dev, u32 handle);
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struct qdisc_rate_table *qdisc_get_rtab(struct tc_ratespec *r,
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struct nlattr *tab);
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void qdisc_put_rtab(struct qdisc_rate_table *tab);
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void qdisc_put_stab(struct qdisc_size_table *tab);
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void qdisc_warn_nonwc(const char *txt, struct Qdisc *qdisc);
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bool sch_direct_xmit(struct sk_buff *skb, struct Qdisc *q,
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struct net_device *dev, struct netdev_queue *txq,
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spinlock_t *root_lock, bool validate);
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void __qdisc_run(struct Qdisc *q);
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static inline void qdisc_run(struct Qdisc *q)
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{
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if (qdisc_run_begin(q)) {
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__qdisc_run(q);
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qdisc_run_end(q);
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}
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}
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static inline __be16 tc_skb_protocol(const struct sk_buff *skb)
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{
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/* We need to take extra care in case the skb came via
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* vlan accelerated path. In that case, use skb->vlan_proto
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* as the original vlan header was already stripped.
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*/
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if (skb_vlan_tag_present(skb))
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return skb->vlan_proto;
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return skb->protocol;
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}
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/* Calculate maximal size of packet seen by hard_start_xmit
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routine of this device.
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*/
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static inline unsigned int psched_mtu(const struct net_device *dev)
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{
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return dev->mtu + dev->hard_header_len;
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}
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static inline struct net *qdisc_net(struct Qdisc *q)
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{
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return dev_net(q->dev_queue->dev);
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}
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struct tc_cbs_qopt_offload {
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u8 enable;
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s32 queue;
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s32 hicredit;
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s32 locredit;
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s32 idleslope;
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s32 sendslope;
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};
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#endif
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