---

yaml
---
r: 290047
b: refs/heads/master
c: c3059be
h: refs/heads/master
i:
  290045: 7e482f3
  290043: 6167cdf
  290039: 5d2cd8d
  290031: 0523ff2
  290015: ddb5f1d
  289983: 85c143d
  289919: ed62c26
  289791: 4d43e99
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 17b8a74f00474fb4fe6154aa426a80bcf1220997
+refs/heads/master: c3059be16c9ef29c05f0876a9df5fea21f29724f

trunk/include/linux/pkt_sched.h

@@ -127,6 +127,27 @@ struct tc_multiq_qopt {
 	__u16	max_bands;		/* Maximum number of queues */
 };
 
+/* PLUG section */
+
+#define TCQ_PLUG_BUFFER                0
+#define TCQ_PLUG_RELEASE_ONE           1
+#define TCQ_PLUG_RELEASE_INDEFINITE    2
+#define TCQ_PLUG_LIMIT                 3
+
+struct tc_plug_qopt {
+	/* TCQ_PLUG_BUFFER: Inset a plug into the queue and
+	 *  buffer any incoming packets
+	 * TCQ_PLUG_RELEASE_ONE: Dequeue packets from queue head
+	 *   to beginning of the next plug.
+	 * TCQ_PLUG_RELEASE_INDEFINITE: Dequeue all packets from queue.
+	 *   Stop buffering packets until the next TCQ_PLUG_BUFFER
+	 *   command is received (just act as a pass-thru queue).
+	 * TCQ_PLUG_LIMIT: Increase/decrease queue size
+	 */
+	int             action;
+	__u32           limit;
+};
+
 /* TBF section */
 
 struct tc_tbf_qopt {

trunk/net/sched/Kconfig

@@ -260,6 +260,32 @@ config NET_SCH_INGRESS
 	  To compile this code as a module, choose M here: the
 	  module will be called sch_ingress.
 
+config NET_SCH_PLUG
+	tristate "Plug network traffic until release (PLUG)"
+	---help---
+
+	  This queuing discipline allows userspace to plug/unplug a network
+	  output queue, using the netlink interface.  When it receives an
+	  enqueue command it inserts a plug into the outbound queue that
+	  causes following packets to enqueue until a dequeue command arrives
+	  over netlink, causing the plug to be removed and resuming the normal
+	  packet flow.
+
+	  This module also provides a generic "network output buffering"
+	  functionality (aka output commit), wherein upon arrival of a dequeue
+	  command, only packets up to the first plug are released for delivery.
+	  The Remus HA project uses this module to enable speculative execution
+	  of virtual machines by allowing the generated network output to be rolled
+	  back if needed.
+
+	  For more information, please refer to http://wiki.xensource.com/xenwiki/Remus
+
+	  Say Y here if you are using this kernel for Xen dom0 and
+	  want to protect Xen guests with Remus.
+
+	  To compile this code as a module, choose M here: the
+	  module will be called sch_plug.
+
 comment "Classification"
 
 config NET_CLS

trunk/net/sched/Makefile

@@ -33,6 +33,7 @@ obj-$(CONFIG_NET_SCH_MULTIQ)	+= sch_multiq.o
 obj-$(CONFIG_NET_SCH_ATM)	+= sch_atm.o
 obj-$(CONFIG_NET_SCH_NETEM)	+= sch_netem.o
 obj-$(CONFIG_NET_SCH_DRR)	+= sch_drr.o
+obj-$(CONFIG_NET_SCH_PLUG)	+= sch_plug.o
 obj-$(CONFIG_NET_SCH_MQPRIO)	+= sch_mqprio.o
 obj-$(CONFIG_NET_SCH_CHOKE)	+= sch_choke.o
 obj-$(CONFIG_NET_SCH_QFQ)	+= sch_qfq.o

trunk/net/sched/sch_plug.c

@@ -0,0 +1,233 @@
+/*
+ * sch_plug.c Queue traffic until an explicit release command
+ *
+ *             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.
+ *
+ * There are two ways to use this qdisc:
+ * 1. A simple "instantaneous" plug/unplug operation, by issuing an alternating
+ *    sequence of TCQ_PLUG_BUFFER & TCQ_PLUG_RELEASE_INDEFINITE commands.
+ *
+ * 2. For network output buffering (a.k.a output commit) functionality.
+ *    Output commit property is commonly used by applications using checkpoint
+ *    based fault-tolerance to ensure that the checkpoint from which a system
+ *    is being restored is consistent w.r.t outside world.
+ *
+ *    Consider for e.g. Remus - a Virtual Machine checkpointing system,
+ *    wherein a VM is checkpointed, say every 50ms. The checkpoint is replicated
+ *    asynchronously to the backup host, while the VM continues executing the
+ *    next epoch speculatively.
+ *
+ *    The following is a typical sequence of output buffer operations:
+ *       1.At epoch i, start_buffer(i)
+ *       2. At end of epoch i (i.e. after 50ms):
+ *          2.1 Stop VM and take checkpoint(i).
+ *          2.2 start_buffer(i+1) and Resume VM
+ *       3. While speculatively executing epoch(i+1), asynchronously replicate
+ *          checkpoint(i) to backup host.
+ *       4. When checkpoint_ack(i) is received from backup, release_buffer(i)
+ *    Thus, this Qdisc would receive the following sequence of commands:
+ *       TCQ_PLUG_BUFFER (epoch i)
+ *       .. TCQ_PLUG_BUFFER (epoch i+1)
+ *       ....TCQ_PLUG_RELEASE_ONE (epoch i)
+ *       ......TCQ_PLUG_BUFFER (epoch i+2)
+ *       ........
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <net/pkt_sched.h>
+
+/*
+ * State of the queue, when used for network output buffering:
+ *
+ *                 plug(i+1)            plug(i)          head
+ * ------------------+--------------------+---------------->
+ *                   |                    |
+ *                   |                    |
+ * pkts_current_epoch| pkts_last_epoch    |pkts_to_release
+ * ----------------->|<--------+--------->|+--------------->
+ *                   v                    v
+ *
+ */
+
+struct plug_sched_data {
+	/* If true, the dequeue function releases all packets
+	 * from head to end of the queue. The queue turns into
+	 * a pass-through queue for newly arriving packets.
+	 */
+	bool unplug_indefinite;
+
+	/* Queue Limit in bytes */
+	u32 limit;
+
+	/* Number of packets (output) from the current speculatively
+	 * executing epoch.
+	 */
+	u32 pkts_current_epoch;
+
+	/* Number of packets corresponding to the recently finished
+	 * epoch. These will be released when we receive a
+	 * TCQ_PLUG_RELEASE_ONE command. This command is typically
+	 * issued after committing a checkpoint at the target.
+	 */
+	u32 pkts_last_epoch;
+
+	/*
+	 * Number of packets from the head of the queue, that can
+	 * be released (committed checkpoint).
+	 */
+	u32 pkts_to_release;
+};
+
+static int plug_enqueue(struct sk_buff *skb, struct Qdisc *sch)
+{
+	struct plug_sched_data *q = qdisc_priv(sch);
+
+	if (likely(sch->qstats.backlog + skb->len <= q->limit)) {
+		if (!q->unplug_indefinite)
+			q->pkts_current_epoch++;
+		return qdisc_enqueue_tail(skb, sch);
+	}
+
+	return qdisc_reshape_fail(skb, sch);
+}
+
+static struct sk_buff *plug_dequeue(struct Qdisc *sch)
+{
+	struct plug_sched_data *q = qdisc_priv(sch);
+
+	if (qdisc_is_throttled(sch))
+		return NULL;
+
+	if (!q->unplug_indefinite) {
+		if (!q->pkts_to_release) {
+			/* No more packets to dequeue. Block the queue
+			 * and wait for the next release command.
+			 */
+			qdisc_throttled(sch);
+			return NULL;
+		}
+		q->pkts_to_release--;
+	}
+
+	return qdisc_dequeue_head(sch);
+}
+
+static int plug_init(struct Qdisc *sch, struct nlattr *opt)
+{
+	struct plug_sched_data *q = qdisc_priv(sch);
+
+	q->pkts_current_epoch = 0;
+	q->pkts_last_epoch = 0;
+	q->pkts_to_release = 0;
+	q->unplug_indefinite = false;
+
+	if (opt == NULL) {
+		/* We will set a default limit of 100 pkts (~150kB)
+		 * in case tx_queue_len is not available. The
+		 * default value is completely arbitrary.
+		 */
+		u32 pkt_limit = qdisc_dev(sch)->tx_queue_len ? : 100;
+		q->limit = pkt_limit * psched_mtu(qdisc_dev(sch));
+	} else {
+		struct tc_plug_qopt *ctl = nla_data(opt);
+
+		if (nla_len(opt) < sizeof(*ctl))
+			return -EINVAL;
+
+		q->limit = ctl->limit;
+	}
+
+	qdisc_throttled(sch);
+	return 0;
+}
+
+/* Receives 4 types of messages:
+ * TCQ_PLUG_BUFFER: Inset a plug into the queue and
+ *  buffer any incoming packets
+ * TCQ_PLUG_RELEASE_ONE: Dequeue packets from queue head
+ *   to beginning of the next plug.
+ * TCQ_PLUG_RELEASE_INDEFINITE: Dequeue all packets from queue.
+ *   Stop buffering packets until the next TCQ_PLUG_BUFFER
+ *   command is received (just act as a pass-thru queue).
+ * TCQ_PLUG_LIMIT: Increase/decrease queue size
+ */
+static int plug_change(struct Qdisc *sch, struct nlattr *opt)
+{
+	struct plug_sched_data *q = qdisc_priv(sch);
+	struct tc_plug_qopt *msg;
+
+	if (opt == NULL)
+		return -EINVAL;
+
+	msg = nla_data(opt);
+	if (nla_len(opt) < sizeof(*msg))
+		return -EINVAL;
+
+	switch (msg->action) {
+	case TCQ_PLUG_BUFFER:
+		/* Save size of the current buffer */
+		q->pkts_last_epoch = q->pkts_current_epoch;
+		q->pkts_current_epoch = 0;
+		if (q->unplug_indefinite)
+			qdisc_throttled(sch);
+		q->unplug_indefinite = false;
+		break;
+	case TCQ_PLUG_RELEASE_ONE:
+		/* Add packets from the last complete buffer to the
+		 * packets to be released set.
+		 */
+		q->pkts_to_release += q->pkts_last_epoch;
+		q->pkts_last_epoch = 0;
+		qdisc_unthrottled(sch);
+		netif_schedule_queue(sch->dev_queue);
+		break;
+	case TCQ_PLUG_RELEASE_INDEFINITE:
+		q->unplug_indefinite = true;
+		q->pkts_to_release = 0;
+		q->pkts_last_epoch = 0;
+		q->pkts_current_epoch = 0;
+		qdisc_unthrottled(sch);
+		netif_schedule_queue(sch->dev_queue);
+		break;
+	case TCQ_PLUG_LIMIT:
+		/* Limit is supplied in bytes */
+		q->limit = msg->limit;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+struct Qdisc_ops plug_qdisc_ops = {
+	.id          =       "plug",
+	.priv_size   =       sizeof(struct plug_sched_data),
+	.enqueue     =       plug_enqueue,
+	.dequeue     =       plug_dequeue,
+	.peek        =       qdisc_peek_head,
+	.init        =       plug_init,
+	.change      =       plug_change,
+	.owner       =       THIS_MODULE,
+};
+
+static int __init plug_module_init(void)
+{
+	return register_qdisc(&plug_qdisc_ops);
+}
+
+static void __exit plug_module_exit(void)
+{
+	unregister_qdisc(&plug_qdisc_ops);
+}
+module_init(plug_module_init)
+module_exit(plug_module_exit)
+MODULE_LICENSE("GPL");