linux-sg2042/net/atm/mpoa_caches.c

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#include <linux/types.h>
#include <linux/atmmpc.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#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;
}