Release 4.11 net/netfilter/ipvs/ip_vs_sched.c

/*
 * IPVS         An implementation of the IP virtual server support for the
 *              LINUX operating system.  IPVS is now implemented as a module
 *              over the Netfilter framework. IPVS can be used to build a
 *              high-performance and highly available server based on a
 *              cluster of servers.
 *
 * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
 *              Peter Kese <peter.kese@ijs.si>
 *
 *              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.
 *
 * Changes:
 *
 */


#define KMSG_COMPONENT "IPVS"

#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <asm/string.h>
#include <linux/kmod.h>
#include <linux/sysctl.h>

#include <net/ip_vs.h>


EXPORT_SYMBOL(ip_vs_scheduler_err);
/*
 *  IPVS scheduler list
 */
static LIST_HEAD(ip_vs_schedulers);

/* semaphore for schedulers */
static DEFINE_MUTEX(ip_vs_sched_mutex);


/*
 *  Bind a service with a scheduler
 */


int ip_vs_bind_scheduler(struct ip_vs_service *svc,
			 struct ip_vs_scheduler *scheduler)
{
	int ret;

	if (scheduler->init_service) {
		ret = scheduler->init_service(svc);
		if (ret) {
			pr_err("%s(): init error\n", __func__);
			return ret;
		}
	}
	rcu_assign_pointer(svc->scheduler, scheduler);
	return 0;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Wensong Zhang
50
79.37%
1
33.33%
Julian Anastasov
9
14.29%
1
33.33%
Hannes Eder
4
6.35%
1
33.33%
Total
63
100.00%
3
100.00%

/*
 *  Unbind a service with its scheduler
 */


void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
			    struct ip_vs_scheduler *sched)
{
	struct ip_vs_scheduler *cur_sched;

	cur_sched = rcu_dereference_protected(svc->scheduler, 1);
	/* This check proves that old 'sched' was installed */
	if (!cur_sched)
		return;

	if (sched->done_service)
		sched->done_service(svc);
	/* svc->scheduler can be set to NULL only by caller */
}


Contributors
Person
Tokens
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Commits
CommitProp
Wensong Zhang
31
59.62%
1
20.00%
Julian Anastasov
20
38.46%
3
60.00%
Simon Horman
1
1.92%
1
20.00%
Total
52
100.00%
5
100.00%

/*
 *  Get scheduler in the scheduler list by name
 */


static struct ip_vs_scheduler *ip_vs_sched_getbyname(const char *sched_name)
{
	struct ip_vs_scheduler *sched;

	IP_VS_DBG(2, "%s(): sched_name \"%s\"\n", __func__, sched_name);

	mutex_lock(&ip_vs_sched_mutex);

	list_for_each_entry(sched, &ip_vs_schedulers, n_list) {
		/*
                 * Test and get the modules atomically
                 */
		if (sched->module && !try_module_get(sched->module)) {
			/*
                         * This scheduler is just deleted
                         */
			continue;
		}
		if (strcmp(sched_name, sched->name)==0) {
			/* HIT */
			mutex_unlock(&ip_vs_sched_mutex);
			return sched;
		}
		module_put(sched->module);
	}

	mutex_unlock(&ip_vs_sched_mutex);
	return NULL;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Wensong Zhang
91
86.67%
1
25.00%
Julian Anastasov
6
5.71%
1
25.00%
Stephen Hemminger
5
4.76%
1
25.00%
Hannes Eder
3
2.86%
1
25.00%
Total
105
100.00%
4
100.00%

/*
 *  Lookup scheduler and try to load it if it doesn't exist
 */


struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name)
{
	struct ip_vs_scheduler *sched;

	/*
         *  Search for the scheduler by sched_name
         */
	sched = ip_vs_sched_getbyname(sched_name);

	/*
         *  If scheduler not found, load the module and search again
         */
	if (sched == NULL) {
		request_module("ip_vs_%s", sched_name);
		sched = ip_vs_sched_getbyname(sched_name);
	}

	return sched;
}

Contributors
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Tokens
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Commits
CommitProp
Wensong Zhang
50
98.04%
1
50.00%
Randy Dunlap
1
1.96%
1
50.00%
Total
51
100.00%
2
100.00%



void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler)
{
	if (scheduler)
		module_put(scheduler->module);
}

Contributors
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Wensong Zhang
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%

/*
 * Common error output helper for schedulers
 */



void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg)
{
	struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
	char *sched_name = sched ? sched->name : "none";

	if (svc->fwmark) {
		IP_VS_ERR_RL("%s: FWM %u 0x%08X - %s\n",
			     sched_name, svc->fwmark, svc->fwmark, msg);
#ifdef CONFIG_IP_VS_IPV6
	} else if (svc->af == AF_INET6) {
		IP_VS_ERR_RL("%s: %s [%pI6c]:%d - %s\n",
			     sched_name, ip_vs_proto_name(svc->protocol),
			     &svc->addr.in6, ntohs(svc->port), msg);
#endif
	} else {
		IP_VS_ERR_RL("%s: %s %pI4:%d - %s\n",
			     sched_name, ip_vs_proto_name(svc->protocol),
			     &svc->addr.ip, ntohs(svc->port), msg);
	}
}

Contributors
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Patrick Schaaf
115
80.42%
1
25.00%
Julian Anastasov
27
18.88%
2
50.00%
Jesper Dangaard Brouer
1
0.70%
1
25.00%
Total
143
100.00%
4
100.00%

/*
 *  Register a scheduler in the scheduler list
 */


int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
{
	struct ip_vs_scheduler *sched;

	if (!scheduler) {
		pr_err("%s(): NULL arg\n", __func__);
		return -EINVAL;
	}

	if (!scheduler->name) {
		pr_err("%s(): NULL scheduler_name\n", __func__);
		return -EINVAL;
	}

	/* increase the module use count */
	ip_vs_use_count_inc();

	mutex_lock(&ip_vs_sched_mutex);

	if (!list_empty(&scheduler->n_list)) {
		mutex_unlock(&ip_vs_sched_mutex);
		ip_vs_use_count_dec();
		pr_err("%s(): [%s] scheduler already linked\n",
		       __func__, scheduler->name);
		return -EINVAL;
	}

	/*
         *  Make sure that the scheduler with this name doesn't exist
         *  in the scheduler list.
         */
	list_for_each_entry(sched, &ip_vs_schedulers, n_list) {
		if (strcmp(scheduler->name, sched->name) == 0) {
			mutex_unlock(&ip_vs_sched_mutex);
			ip_vs_use_count_dec();
			pr_err("%s(): [%s] scheduler already existed "
			       "in the system\n", __func__, scheduler->name);
			return -EINVAL;
		}
	}
	/*
         *      Add it into the d-linked scheduler list
         */
	list_add(&scheduler->n_list, &ip_vs_schedulers);
	mutex_unlock(&ip_vs_sched_mutex);

	pr_info("[%s] scheduler registered.\n", scheduler->name);

	return 0;
}


Contributors
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Tokens
Prop
Commits
CommitProp
Wensong Zhang
129
70.49%
1
20.00%
Pavel Emelyanov
24
13.11%
1
20.00%
Hannes Eder
18
9.84%
1
20.00%
Julian Anastasov
8
4.37%
1
20.00%
Sven Wegener
4
2.19%
1
20.00%
Total
183
100.00%
5
100.00%

/*
 *  Unregister a scheduler from the scheduler list
 */


int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler)
{
	if (!scheduler) {
		pr_err("%s(): NULL arg\n", __func__);
		return -EINVAL;
	}

	mutex_lock(&ip_vs_sched_mutex);
	if (list_empty(&scheduler->n_list)) {
		mutex_unlock(&ip_vs_sched_mutex);
		pr_err("%s(): [%s] scheduler is not in the list. failed\n",
		       __func__, scheduler->name);
		return -EINVAL;
	}

	/*
         *      Remove it from the d-linked scheduler list
         */
	list_del(&scheduler->n_list);
	mutex_unlock(&ip_vs_sched_mutex);

	/* decrease the module use count */
	ip_vs_use_count_dec();

	pr_info("[%s] scheduler unregistered.\n", scheduler->name);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Wensong Zhang
80
81.63%
1
25.00%
Hannes Eder
9
9.18%
1
25.00%
Julian Anastasov
6
6.12%
1
25.00%
Sven Wegener
3
3.06%
1
25.00%
Total
98
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Wensong Zhang
481
62.06%
1
5.56%
Patrick Schaaf
121
15.61%
1
5.56%
Julian Anastasov
79
10.19%
4
22.22%
Hannes Eder
45
5.81%
2
11.11%
Pavel Emelyanov
27
3.48%
2
11.11%
Sven Wegener
7
0.90%
1
5.56%
Stephen Hemminger
5
0.65%
1
5.56%
Adrian Bunk
4
0.52%
2
11.11%
Thomas Gleixner
3
0.39%
1
5.56%
Jesper Dangaard Brouer
1
0.13%
1
5.56%
Simon Horman
1
0.13%
1
5.56%
Randy Dunlap
1
0.13%
1
5.56%
Total
775
100.00%
18
100.00%
Directory: net/netfilter/ipvs

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