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/*
* net/sched/sch_sfq.c Stochastic Fairness Queueing discipline.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ipv6.h>
#include <linux/skbuff.h>
#include <linux/jhash.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
/* Stochastic Fairness Queuing algorithm.
=======================================
Source:
Paul E. McKenney "Stochastic Fairness Queuing",
IEEE INFOCOMM'90 Proceedings, San Francisco, 1990.
Paul E. McKenney "Stochastic Fairness Queuing",
"Interworking: Research and Experience", v.2, 1991, p.113-131.
See also:
M. Shreedhar and George Varghese "Efficient Fair
Queuing using Deficit Round Robin", Proc. SIGCOMM 95.
This is not the thing that is usually called (W)FQ nowadays.
It does not use any timestamp mechanism, but instead
processes queues in round-robin order.
ADVANTAGE:
- It is very cheap. Both CPU and memory requirements are minimal.
DRAWBACKS:
- "Stochastic" -> It is not 100% fair.
When hash collisions occur, several flows are considered as one.
- "Round-robin" -> It introduces larger delays than virtual clock
based schemes, and should not be used for isolating interactive
traffic from non-interactive. It means, that this scheduler
should be used as leaf of CBQ or P3, which put interactive traffic
to higher priority band.
We still need true WFQ for top level CSZ, but using WFQ
for the best effort traffic is absolutely pointless:
SFQ is superior for this purpose.
IMPLEMENTATION:
This implementation limits maximal queue length to 128;
maximal mtu to 2^15-1; number of hash buckets to 1024.
The only goal of this restrictions was that all data
fit into one 4K page :-). Struct sfq_sched_data is
organized in anti-cache manner: all the data for a bucket
are scattered over different locations. This is not good,
but it allowed me to put it into 4K.
It is easy to increase these values, but not in flight. */
#define SFQ_DEPTH 128
#define SFQ_HASH_DIVISOR 1024
/* This type should contain at least SFQ_DEPTH*2 values */
typedef unsigned char sfq_index;
struct sfq_head
{
sfq_index next;
sfq_index prev;
};
struct sfq_sched_data
{
/* Parameters */
int perturb_period;
unsigned quantum; /* Allotment per round: MUST BE >= MTU */
int limit;
/* Variables */
struct tcf_proto *filter_list;
struct timer_list perturb_timer;
u32 perturbation;
sfq_index tail; /* Index of current slot in round */
sfq_index max_depth; /* Maximal depth */
sfq_index ht[SFQ_HASH_DIVISOR]; /* Hash table */
sfq_index next[SFQ_DEPTH]; /* Active slots link */
short allot[SFQ_DEPTH]; /* Current allotment per slot */
unsigned short hash[SFQ_DEPTH]; /* Hash value indexed by slots */
struct sk_buff_head qs[SFQ_DEPTH]; /* Slot queue */
struct sfq_head dep[SFQ_DEPTH*2]; /* Linked list of slots, indexed by depth */
};
static __inline__ unsigned sfq_fold_hash(struct sfq_sched_data *q, u32 h, u32 h1)
{
return jhash_2words(h, h1, q->perturbation) & (SFQ_HASH_DIVISOR - 1);
}
static unsigned sfq_hash(struct sfq_sched_data *q, struct sk_buff *skb)
{
u32 h, h2;
switch (skb->protocol) {
case htons(ETH_P_IP):
{
const struct iphdr *iph = ip_hdr(skb);
h = iph->daddr;
h2 = iph->saddr ^ iph->protocol;
if (!(iph->frag_off&htons(IP_MF|IP_OFFSET)) &&
(iph->protocol == IPPROTO_TCP ||
iph->protocol == IPPROTO_UDP ||
iph->protocol == IPPROTO_UDPLITE ||
iph->protocol == IPPROTO_SCTP ||
iph->protocol == IPPROTO_DCCP ||
iph->protocol == IPPROTO_ESP))
h2 ^= *(((u32*)iph) + iph->ihl);
break;
}
case htons(ETH_P_IPV6):
{
struct ipv6hdr *iph = ipv6_hdr(skb);
h = iph->daddr.s6_addr32[3];
h2 = iph->saddr.s6_addr32[3] ^ iph->nexthdr;
if (iph->nexthdr == IPPROTO_TCP ||
iph->nexthdr == IPPROTO_UDP ||
iph->nexthdr == IPPROTO_UDPLITE ||
iph->nexthdr == IPPROTO_SCTP ||
iph->nexthdr == IPPROTO_DCCP ||
iph->nexthdr == IPPROTO_ESP)
h2 ^= *(u32*)&iph[1];
break;
}
default:
h = (unsigned long)skb_dst(skb) ^ skb->protocol;
h2 = (unsigned long)skb->sk;
}
return sfq_fold_hash(q, h, h2);
}
static unsigned int sfq_classify(struct sk_buff *skb, struct Qdisc *sch,
int *qerr)
{
struct sfq_sched_data *q = qdisc_priv(sch);
struct tcf_result res;
int result;
if (TC_H_MAJ(skb->priority) == sch->handle &&
TC_H_MIN(skb->priority) > 0 &&
TC_H_MIN(skb->priority) <= SFQ_HASH_DIVISOR)
return TC_H_MIN(skb->priority);
if (!q->filter_list)
return sfq_hash(q, skb) + 1;
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
result = tc_classify(skb, q->filter_list, &res);
if (result >= 0) {
#ifdef CONFIG_NET_CLS_ACT
switch (result) {
case TC_ACT_STOLEN:
case TC_ACT_QUEUED:
*qerr = NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
case TC_ACT_SHOT:
return 0;
}
#endif
if (TC_H_MIN(res.classid) <= SFQ_HASH_DIVISOR)
return TC_H_MIN(res.classid);
}
return 0;
}
static inline void sfq_link(struct sfq_sched_data *q, sfq_index x)
{
sfq_index p, n;
int d = q->qs[x].qlen + SFQ_DEPTH;
p = d;
n = q->dep[d].next;
q->dep[x].next = n;
q->dep[x].prev = p;
q->dep[p].next = q->dep[n].prev = x;
}
static inline void sfq_dec(struct sfq_sched_data *q, sfq_index x)
{
sfq_index p, n;
n = q->dep[x].next;
p = q->dep[x].prev;
q->dep[p].next = n;
q->dep[n].prev = p;
if (n == p && q->max_depth == q->qs[x].qlen + 1)
q->max_depth--;
sfq_link(q, x);
}
static inline void sfq_inc(struct sfq_sched_data *q, sfq_index x)
{
sfq_index p, n;
int d;
n = q->dep[x].next;
p = q->dep[x].prev;
q->dep[p].next = n;
q->dep[n].prev = p;
d = q->qs[x].qlen;
if (q->max_depth < d)
q->max_depth = d;
sfq_link(q, x);
}
static unsigned int sfq_drop(struct Qdisc *sch)
{
struct sfq_sched_data *q = qdisc_priv
|