Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 569 insertions, 0 deletions

diff --git a/kernel/net/atm/mpoa_caches.c b/kernel/net/atm/mpoa_caches.c
new file mode 100644
index 000000000..d1b2d9a03
--- /dev/null
+++ b/kernel/net/atm/mpoa_caches.c
@@ -0,0 +1,569 @@
+#include <linux/types.h>
+#include <linux/atmmpc.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+
+#include "mpoa_caches.h"
+#include "mpc.h"
+
+/*
+ * mpoa_caches.c: Implementation of ingress and egress cache
+ * handling functions
+ */
+
+#if 0
+#define dprintk(format, args...)					\
+	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
+#else
+#define dprintk(format, args...)					\
+	do { if (0)							\
+		printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
+	} while (0)
+#endif
+
+#if 0
+#define ddprintk(format, args...)					\
+	printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args)  /* debug */
+#else
+#define ddprintk(format, args...)					\
+	do { if (0)							\
+		printk(KERN_DEBUG "mpoa:%s: " format, __FILE__, ##args);\
+	} while (0)
+#endif
+
+static in_cache_entry *in_cache_get(__be32 dst_ip,
+				    struct mpoa_client *client)
+{
+	in_cache_entry *entry;
+
+	read_lock_bh(&client->ingress_lock);
+	entry = client->in_cache;
+	while (entry != NULL) {
+		if (entry->ctrl_info.in_dst_ip == dst_ip) {
+			atomic_inc(&entry->use);
+			read_unlock_bh(&client->ingress_lock);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_bh(&client->ingress_lock);
+
+	return NULL;
+}
+
+static in_cache_entry *in_cache_get_with_mask(__be32 dst_ip,
+					      struct mpoa_client *client,
+					      __be32 mask)
+{
+	in_cache_entry *entry;
+
+	read_lock_bh(&client->ingress_lock);
+	entry = client->in_cache;
+	while (entry != NULL) {
+		if ((entry->ctrl_info.in_dst_ip & mask) == (dst_ip & mask)) {
+			atomic_inc(&entry->use);
+			read_unlock_bh(&client->ingress_lock);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_bh(&client->ingress_lock);
+
+	return NULL;
+
+}
+
+static in_cache_entry *in_cache_get_by_vcc(struct atm_vcc *vcc,
+					   struct mpoa_client *client)
+{
+	in_cache_entry *entry;
+
+	read_lock_bh(&client->ingress_lock);
+	entry = client->in_cache;
+	while (entry != NULL) {
+		if (entry->shortcut == vcc) {
+			atomic_inc(&entry->use);
+			read_unlock_bh(&client->ingress_lock);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_bh(&client->ingress_lock);
+
+	return NULL;
+}
+
+static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
+					  struct mpoa_client *client)
+{
+	in_cache_entry *entry = kzalloc(sizeof(in_cache_entry), GFP_KERNEL);
+
+	if (entry == NULL) {
+		pr_info("mpoa: mpoa_caches.c: new_in_cache_entry: out of memory\n");
+		return NULL;
+	}
+
+	dprintk("adding an ingress entry, ip = %pI4\n", &dst_ip);
+
+	atomic_set(&entry->use, 1);
+	dprintk("new_in_cache_entry: about to lock\n");
+	write_lock_bh(&client->ingress_lock);
+	entry->next = client->in_cache;
+	entry->prev = NULL;
+	if (client->in_cache != NULL)
+		client->in_cache->prev = entry;
+	client->in_cache = entry;
+
+	memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
+	entry->ctrl_info.in_dst_ip = dst_ip;
+	do_gettimeofday(&(entry->tv));
+	entry->retry_time = client->parameters.mpc_p4;
+	entry->count = 1;
+	entry->entry_state = INGRESS_INVALID;
+	entry->ctrl_info.holding_time = HOLDING_TIME_DEFAULT;
+	atomic_inc(&entry->use);
+
+	write_unlock_bh(&client->ingress_lock);
+	dprintk("new_in_cache_entry: unlocked\n");
+
+	return entry;
+}
+
+static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
+{
+	struct atm_mpoa_qos *qos;
+	struct k_message msg;
+
+	entry->count++;
+	if (entry->entry_state == INGRESS_RESOLVED && entry->shortcut != NULL)
+		return OPEN;
+
+	if (entry->entry_state == INGRESS_REFRESHING) {
+		if (entry->count > mpc->parameters.mpc_p1) {
+			msg.type = SND_MPOA_RES_RQST;
+			msg.content.in_info = entry->ctrl_info;
+			memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
+			qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
+			if (qos != NULL)
+				msg.qos = qos->qos;
+			msg_to_mpoad(&msg, mpc);
+			do_gettimeofday(&(entry->reply_wait));
+			entry->entry_state = INGRESS_RESOLVING;
+		}
+		if (entry->shortcut != NULL)
+			return OPEN;
+		return CLOSED;
+	}
+
+	if (entry->entry_state == INGRESS_RESOLVING && entry->shortcut != NULL)
+		return OPEN;
+
+	if (entry->count > mpc->parameters.mpc_p1 &&
+	    entry->entry_state == INGRESS_INVALID) {
+		dprintk("(%s) threshold exceeded for ip %pI4, sending MPOA res req\n",
+			mpc->dev->name, &entry->ctrl_info.in_dst_ip);
+		entry->entry_state = INGRESS_RESOLVING;
+		msg.type = SND_MPOA_RES_RQST;
+		memcpy(msg.MPS_ctrl, mpc->mps_ctrl_addr, ATM_ESA_LEN);
+		msg.content.in_info = entry->ctrl_info;
+		qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
+		if (qos != NULL)
+			msg.qos = qos->qos;
+		msg_to_mpoad(&msg, mpc);
+		do_gettimeofday(&(entry->reply_wait));
+	}
+
+	return CLOSED;
+}
+
+static void in_cache_put(in_cache_entry *entry)
+{
+	if (atomic_dec_and_test(&entry->use)) {
+		memset(entry, 0, sizeof(in_cache_entry));
+		kfree(entry);
+	}
+}
+
+/*
+ * This should be called with write lock on
+ */
+static void in_cache_remove_entry(in_cache_entry *entry,
+				  struct mpoa_client *client)
+{
+	struct atm_vcc *vcc;
+	struct k_message msg;
+
+	vcc = entry->shortcut;
+	dprintk("removing an ingress entry, ip = %pI4\n",
+		&entry->ctrl_info.in_dst_ip);
+
+	if (entry->prev != NULL)
+		entry->prev->next = entry->next;
+	else
+		client->in_cache = entry->next;
+	if (entry->next != NULL)
+		entry->next->prev = entry->prev;
+	client->in_ops->put(entry);
+	if (client->in_cache == NULL && client->eg_cache == NULL) {
+		msg.type = STOP_KEEP_ALIVE_SM;
+		msg_to_mpoad(&msg, client);
+	}
+
+	/* Check if the egress side still uses this VCC */
+	if (vcc != NULL) {
+		eg_cache_entry *eg_entry = client->eg_ops->get_by_vcc(vcc,
+								      client);
+		if (eg_entry != NULL) {
+			client->eg_ops->put(eg_entry);
+			return;
+		}
+		vcc_release_async(vcc, -EPIPE);
+	}
+}
+
+/* Call this every MPC-p2 seconds... Not exactly correct solution,
+   but an easy one... */
+static void clear_count_and_expired(struct mpoa_client *client)
+{
+	in_cache_entry *entry, *next_entry;
+	struct timeval now;
+
+	do_gettimeofday(&now);
+
+	write_lock_bh(&client->ingress_lock);
+	entry = client->in_cache;
+	while (entry != NULL) {
+		entry->count = 0;
+		next_entry = entry->next;
+		if ((now.tv_sec - entry->tv.tv_sec)
+		   > entry->ctrl_info.holding_time) {
+			dprintk("holding time expired, ip = %pI4\n",
+				&entry->ctrl_info.in_dst_ip);
+			client->in_ops->remove_entry(entry, client);
+		}
+		entry = next_entry;
+	}
+	write_unlock_bh(&client->ingress_lock);
+}
+
+/* Call this every MPC-p4 seconds. */
+static void check_resolving_entries(struct mpoa_client *client)
+{
+
+	struct atm_mpoa_qos *qos;
+	in_cache_entry *entry;
+	struct timeval now;
+	struct k_message msg;
+
+	do_gettimeofday(&now);
+
+	read_lock_bh(&client->ingress_lock);
+	entry = client->in_cache;
+	while (entry != NULL) {
+		if (entry->entry_state == INGRESS_RESOLVING) {
+			if ((now.tv_sec - entry->hold_down.tv_sec) <
+			    client->parameters.mpc_p6) {
+				entry = entry->next;	/* Entry in hold down */
+				continue;
+			}
+			if ((now.tv_sec - entry->reply_wait.tv_sec) >
+			    entry->retry_time) {
+				entry->retry_time = MPC_C1 * (entry->retry_time);
+				/*
+				 * Retry time maximum exceeded,
+				 * put entry in hold down.
+				 */
+				if (entry->retry_time > client->parameters.mpc_p5) {
+					do_gettimeofday(&(entry->hold_down));
+					entry->retry_time = client->parameters.mpc_p4;
+					entry = entry->next;
+					continue;
+				}
+				/* Ask daemon to send a resolution request. */
+				memset(&(entry->hold_down), 0, sizeof(struct timeval));
+				msg.type = SND_MPOA_RES_RTRY;
+				memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
+				msg.content.in_info = entry->ctrl_info;
+				qos = atm_mpoa_search_qos(entry->ctrl_info.in_dst_ip);
+				if (qos != NULL)
+					msg.qos = qos->qos;
+				msg_to_mpoad(&msg, client);
+				do_gettimeofday(&(entry->reply_wait));
+			}
+		}
+		entry = entry->next;
+	}
+	read_unlock_bh(&client->ingress_lock);
+}
+
+/* Call this every MPC-p5 seconds. */
+static void refresh_entries(struct mpoa_client *client)
+{
+	struct timeval now;
+	struct in_cache_entry *entry = client->in_cache;
+
+	ddprintk("refresh_entries\n");
+	do_gettimeofday(&now);
+
+	read_lock_bh(&client->ingress_lock);
+	while (entry != NULL) {
+		if (entry->entry_state == INGRESS_RESOLVED) {
+			if (!(entry->refresh_time))
+				entry->refresh_time = (2 * (entry->ctrl_info.holding_time))/3;
+			if ((now.tv_sec - entry->reply_wait.tv_sec) >
+			    entry->refresh_time) {
+				dprintk("refreshing an entry.\n");
+				entry->entry_state = INGRESS_REFRESHING;
+
+			}
+		}
+		entry = entry->next;
+	}
+	read_unlock_bh(&client->ingress_lock);
+}
+
+static void in_destroy_cache(struct mpoa_client *mpc)
+{
+	write_lock_irq(&mpc->ingress_lock);
+	while (mpc->in_cache != NULL)
+		mpc->in_ops->remove_entry(mpc->in_cache, mpc);
+	write_unlock_irq(&mpc->ingress_lock);
+}
+
+static eg_cache_entry *eg_cache_get_by_cache_id(__be32 cache_id,
+						struct mpoa_client *mpc)
+{
+	eg_cache_entry *entry;
+
+	read_lock_irq(&mpc->egress_lock);
+	entry = mpc->eg_cache;
+	while (entry != NULL) {
+		if (entry->ctrl_info.cache_id == cache_id) {
+			atomic_inc(&entry->use);
+			read_unlock_irq(&mpc->egress_lock);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_irq(&mpc->egress_lock);
+
+	return NULL;
+}
+
+/* This can be called from any context since it saves CPU flags */
+static eg_cache_entry *eg_cache_get_by_tag(__be32 tag, struct mpoa_client *mpc)
+{
+	unsigned long flags;
+	eg_cache_entry *entry;
+
+	read_lock_irqsave(&mpc->egress_lock, flags);
+	entry = mpc->eg_cache;
+	while (entry != NULL) {
+		if (entry->ctrl_info.tag == tag) {
+			atomic_inc(&entry->use);
+			read_unlock_irqrestore(&mpc->egress_lock, flags);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_irqrestore(&mpc->egress_lock, flags);
+
+	return NULL;
+}
+
+/* This can be called from any context since it saves CPU flags */
+static eg_cache_entry *eg_cache_get_by_vcc(struct atm_vcc *vcc,
+					   struct mpoa_client *mpc)
+{
+	unsigned long flags;
+	eg_cache_entry *entry;
+
+	read_lock_irqsave(&mpc->egress_lock, flags);
+	entry = mpc->eg_cache;
+	while (entry != NULL) {
+		if (entry->shortcut == vcc) {
+			atomic_inc(&entry->use);
+			read_unlock_irqrestore(&mpc->egress_lock, flags);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_irqrestore(&mpc->egress_lock, flags);
+
+	return NULL;
+}
+
+static eg_cache_entry *eg_cache_get_by_src_ip(__be32 ipaddr,
+					      struct mpoa_client *mpc)
+{
+	eg_cache_entry *entry;
+
+	read_lock_irq(&mpc->egress_lock);
+	entry = mpc->eg_cache;
+	while (entry != NULL) {
+		if (entry->latest_ip_addr == ipaddr) {
+			atomic_inc(&entry->use);
+			read_unlock_irq(&mpc->egress_lock);
+			return entry;
+		}
+		entry = entry->next;
+	}
+	read_unlock_irq(&mpc->egress_lock);
+
+	return NULL;
+}
+
+static void eg_cache_put(eg_cache_entry *entry)
+{
+	if (atomic_dec_and_test(&entry->use)) {
+		memset(entry, 0, sizeof(eg_cache_entry));
+		kfree(entry);
+	}
+}
+
+/*
+ * This should be called with write lock on
+ */
+static void eg_cache_remove_entry(eg_cache_entry *entry,
+				  struct mpoa_client *client)
+{
+	struct atm_vcc *vcc;
+	struct k_message msg;
+
+	vcc = entry->shortcut;
+	dprintk("removing an egress entry.\n");
+	if (entry->prev != NULL)
+		entry->prev->next = entry->next;
+	else
+		client->eg_cache = entry->next;
+	if (entry->next != NULL)
+		entry->next->prev = entry->prev;
+	client->eg_ops->put(entry);
+	if (client->in_cache == NULL && client->eg_cache == NULL) {
+		msg.type = STOP_KEEP_ALIVE_SM;
+		msg_to_mpoad(&msg, client);
+	}
+
+	/* Check if the ingress side still uses this VCC */
+	if (vcc != NULL) {
+		in_cache_entry *in_entry = client->in_ops->get_by_vcc(vcc, client);
+		if (in_entry != NULL) {
+			client->in_ops->put(in_entry);
+			return;
+		}
+		vcc_release_async(vcc, -EPIPE);
+	}
+}
+
+static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
+					  struct mpoa_client *client)
+{
+	eg_cache_entry *entry = kzalloc(sizeof(eg_cache_entry), GFP_KERNEL);
+
+	if (entry == NULL) {
+		pr_info("out of memory\n");
+		return NULL;
+	}
+
+	dprintk("adding an egress entry, ip = %pI4, this should be our IP\n",
+		&msg->content.eg_info.eg_dst_ip);
+
+	atomic_set(&entry->use, 1);
+	dprintk("new_eg_cache_entry: about to lock\n");
+	write_lock_irq(&client->egress_lock);
+	entry->next = client->eg_cache;
+	entry->prev = NULL;
+	if (client->eg_cache != NULL)
+		client->eg_cache->prev = entry;
+	client->eg_cache = entry;
+
+	memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);
+	entry->ctrl_info = msg->content.eg_info;
+	do_gettimeofday(&(entry->tv));
+	entry->entry_state = EGRESS_RESOLVED;
+	dprintk("new_eg_cache_entry cache_id %u\n",
+		ntohl(entry->ctrl_info.cache_id));
+	dprintk("mps_ip = %pI4\n", &entry->ctrl_info.mps_ip);
+	atomic_inc(&entry->use);
+
+	write_unlock_irq(&client->egress_lock);
+	dprintk("new_eg_cache_entry: unlocked\n");
+
+	return entry;
+}
+
+static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)
+{
+	do_gettimeofday(&(entry->tv));
+	entry->entry_state = EGRESS_RESOLVED;
+	entry->ctrl_info.holding_time = holding_time;
+}
+
+static void clear_expired(struct mpoa_client *client)
+{
+	eg_cache_entry *entry, *next_entry;
+	struct timeval now;
+	struct k_message msg;
+
+	do_gettimeofday(&now);
+
+	write_lock_irq(&client->egress_lock);
+	entry = client->eg_cache;
+	while (entry != NULL) {
+		next_entry = entry->next;
+		if ((now.tv_sec - entry->tv.tv_sec)
+		   > entry->ctrl_info.holding_time) {
+			msg.type = SND_EGRESS_PURGE;
+			msg.content.eg_info = entry->ctrl_info;
+			dprintk("egress_cache: holding time expired, cache_id = %u.\n",
+				ntohl(entry->ctrl_info.cache_id));
+			msg_to_mpoad(&msg, client);
+			client->eg_ops->remove_entry(entry, client);
+		}
+		entry = next_entry;
+	}
+	write_unlock_irq(&client->egress_lock);
+}
+
+static void eg_destroy_cache(struct mpoa_client *mpc)
+{
+	write_lock_irq(&mpc->egress_lock);
+	while (mpc->eg_cache != NULL)
+		mpc->eg_ops->remove_entry(mpc->eg_cache, mpc);
+	write_unlock_irq(&mpc->egress_lock);
+}
+
+
+static struct in_cache_ops ingress_ops = {
+	in_cache_add_entry,               /* add_entry       */
+	in_cache_get,                     /* get             */
+	in_cache_get_with_mask,           /* get_with_mask   */
+	in_cache_get_by_vcc,              /* get_by_vcc      */
+	in_cache_put,                     /* put             */
+	in_cache_remove_entry,            /* remove_entry    */
+	cache_hit,                        /* cache_hit       */
+	clear_count_and_expired,          /* clear_count     */
+	check_resolving_entries,          /* check_resolving */
+	refresh_entries,                  /* refresh         */
+	in_destroy_cache                  /* destroy_cache   */
+};
+
+static struct eg_cache_ops egress_ops = {
+	eg_cache_add_entry,               /* add_entry        */
+	eg_cache_get_by_cache_id,         /* get_by_cache_id  */
+	eg_cache_get_by_tag,              /* get_by_tag       */
+	eg_cache_get_by_vcc,              /* get_by_vcc       */
+	eg_cache_get_by_src_ip,           /* get_by_src_ip    */
+	eg_cache_put,                     /* put              */
+	eg_cache_remove_entry,            /* remove_entry     */
+	update_eg_cache_entry,            /* update           */
+	clear_expired,                    /* clear_expired    */
+	eg_destroy_cache                  /* destroy_cache    */
+};
+
+
+void atm_mpoa_init_cache(struct mpoa_client *mpc)
+{
+	mpc->in_ops = &ingress_ops;
+	mpc->eg_ops = &egress_ops;
+}