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atm: mpoa: remove 32-bit timekeeping 

net/atm/mpoa_* files use 'struct timeval' to store event
timestamps. struct timeval uses a 32-bit seconds field which will
overflow in the year 2038 and beyond. Morever, the timestamps are being
compared only to get seconds elapsed, so struct timeval which stores
a seconds and microseconds field is an overkill. This patch replaces
the use of struct timeval with time64_t to store a 64-bit seconds field.

Signed-off-by: Tina Ruchandani <ruchandani.tina@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tina Ruchandani 2017-11-27 15:02:17 +01:00 committed by David S. Miller
parent 59c036995c
commit d750dbdc07
5 changed files with 43 additions and 40 deletions
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2
net/atm/common.c
View File

@ -14,7 +14,7 @@
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/time.h> /* struct timeval */
#include <linux/time64.h> /* 64-bit time for seconds */
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/init.h>

9
net/atm/mpc.c
View File

@ -1089,7 +1089,7 @@ static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
msg->type = SND_MPOA_RES_RQST;
msg->content.in_info = entry->ctrl_info;
msg_to_mpoad(msg, mpc);
do_gettimeofday(&(entry->reply_wait));
entry->reply_wait = ktime_get_seconds();
mpc->in_ops->put(entry);
return;
}
@ -1099,7 +1099,7 @@ static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc)
msg->type = SND_MPOA_RES_RQST;
msg->content.in_info = entry->ctrl_info;
msg_to_mpoad(msg, mpc);
do_gettimeofday(&(entry->reply_wait));
entry->reply_wait = ktime_get_seconds();
mpc->in_ops->put(entry);
return;
}
@ -1175,8 +1175,9 @@ static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc)
}
entry->ctrl_info = msg->content.in_info;
do_gettimeofday(&(entry->tv));
do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */
entry->time = ktime_get_seconds();
/* Used in refreshing func from now on */
entry->reply_wait = ktime_get_seconds();
entry->refresh_time = 0;
ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);

48
net/atm/mpoa_caches.c
View File

@ -117,7 +117,7 @@ static in_cache_entry *in_cache_add_entry(__be32 dst_ip,
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->time = ktime_get_seconds();
entry->retry_time = client->parameters.mpc_p4;
entry->count = 1;
entry->entry_state = INGRESS_INVALID;
@ -148,7 +148,7 @@ static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
if (qos != NULL)
msg.qos = qos->qos;
msg_to_mpoad(&msg, mpc);
do_gettimeofday(&(entry->reply_wait));
entry->reply_wait = ktime_get_seconds();
entry->entry_state = INGRESS_RESOLVING;
}
if (entry->shortcut != NULL)
@ -171,7 +171,7 @@ static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc)
if (qos != NULL)
msg.qos = qos->qos;
msg_to_mpoad(&msg, mpc);
do_gettimeofday(&(entry->reply_wait));
entry->reply_wait = ktime_get_seconds();
}
return CLOSED;
@ -227,17 +227,16 @@ static void in_cache_remove_entry(in_cache_entry *entry,
static void clear_count_and_expired(struct mpoa_client *client)
{
in_cache_entry *entry, *next_entry;
struct timeval now;
time64_t now;
do_gettimeofday(&now);
now = ktime_get_seconds();
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) {
if ((now - entry->time) > 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);
@ -253,35 +252,35 @@ static void check_resolving_entries(struct mpoa_client *client)
struct atm_mpoa_qos *qos;
in_cache_entry *entry;
struct timeval now;
time64_t now;
struct k_message msg;
do_gettimeofday(&now);
now = ktime_get_seconds();
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) {
if ((now - entry->hold_down)
< client->parameters.mpc_p6) {
entry = entry->next; /* Entry in hold down */
continue;
}
if ((now.tv_sec - entry->reply_wait.tv_sec) >
entry->retry_time) {
if ((now - entry->reply_wait) > 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->hold_down = ktime_get_seconds();
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));
memset(&entry->hold_down, 0, sizeof(time64_t));
msg.type = SND_MPOA_RES_RTRY;
memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);
msg.content.in_info = entry->ctrl_info;
@ -289,7 +288,7 @@ static void check_resolving_entries(struct mpoa_client *client)
if (qos != NULL)
msg.qos = qos->qos;
msg_to_mpoad(&msg, client);
do_gettimeofday(&(entry->reply_wait));
entry->reply_wait = ktime_get_seconds();
}
}
entry = entry->next;
@ -300,18 +299,18 @@ static void check_resolving_entries(struct mpoa_client *client)
/* Call this every MPC-p5 seconds. */
static void refresh_entries(struct mpoa_client *client)
{
struct timeval now;
time64_t now;
struct in_cache_entry *entry = client->in_cache;
ddprintk("refresh_entries\n");
do_gettimeofday(&now);
now = ktime_get_seconds();
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) >
if ((now - entry->reply_wait) >
entry->refresh_time) {
dprintk("refreshing an entry.\n");
entry->entry_state = INGRESS_REFRESHING;
@ -480,7 +479,7 @@ static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
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->time = ktime_get_seconds();
entry->entry_state = EGRESS_RESOLVED;
dprintk("new_eg_cache_entry cache_id %u\n",
ntohl(entry->ctrl_info.cache_id));
@ -495,7 +494,7 @@ static eg_cache_entry *eg_cache_add_entry(struct k_message *msg,
static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)
{
do_gettimeofday(&(entry->tv));
entry->time = ktime_get_seconds();
entry->entry_state = EGRESS_RESOLVED;
entry->ctrl_info.holding_time = holding_time;
}
@ -503,17 +502,16 @@ static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)
static void clear_expired(struct mpoa_client *client)
{
eg_cache_entry *entry, *next_entry;
struct timeval now;
time64_t now;
struct k_message msg;
do_gettimeofday(&now);
now = ktime_get_seconds();
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) {
if ((now - entry->time) > 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",

9
net/atm/mpoa_caches.h
View File

@ -2,6 +2,7 @@
#ifndef MPOA_CACHES_H
#define MPOA_CACHES_H
#include <linux/time64.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/atm.h>
@ -16,9 +17,9 @@ void atm_mpoa_init_cache(struct mpoa_client *mpc);
typedef struct in_cache_entry {
struct in_cache_entry *next;
struct in_cache_entry *prev;
struct timeval tv;
struct timeval reply_wait;
struct timeval hold_down;
time64_t time;
time64_t reply_wait;
time64_t hold_down;
uint32_t packets_fwded;
uint16_t entry_state;
uint32_t retry_time;
@ -53,7 +54,7 @@ struct in_cache_ops{
typedef struct eg_cache_entry{
struct eg_cache_entry *next;
struct eg_cache_entry *prev;
struct timeval tv;
time64_t time;
uint8_t MPS_ctrl_ATM_addr[ATM_ESA_LEN];
struct atm_vcc *shortcut;
uint32_t packets_rcvd;

15
net/atm/mpoa_proc.c
View File

@ -8,7 +8,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/time.h>
#include <linux/ktime.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include <linux/atmmpc.h>
@ -138,7 +138,7 @@ static int mpc_show(struct seq_file *m, void *v)
int i;
in_cache_entry *in_entry;
eg_cache_entry *eg_entry;
struct timeval now;
time64_t now;
unsigned char ip_string[16];
if (v == SEQ_START_TOKEN) {
@ -148,15 +148,17 @@ static int mpc_show(struct seq_file *m, void *v)
seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);
seq_printf(m, "Ingress Entries:\nIP address State Holding time Packets fwded VPI VCI\n");
do_gettimeofday(&now);
now = ktime_get_seconds();
for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
unsigned long seconds_delta = now - in_entry->time;
sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);
seq_printf(m, "%-16s%s%-14lu%-12u",
ip_string,
ingress_state_string(in_entry->entry_state),
in_entry->ctrl_info.holding_time -
(now.tv_sec-in_entry->tv.tv_sec),
seconds_delta,
in_entry->packets_fwded);
if (in_entry->shortcut)
seq_printf(m, " %-3d %-3d",
@ -169,13 +171,14 @@ static int mpc_show(struct seq_file *m, void *v)
seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id State Holding time Packets recvd Latest IP addr VPI VCI\n");
for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {
unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;
unsigned long seconds_delta = now - eg_entry->time;
for (i = 0; i < ATM_ESA_LEN; i++)
seq_printf(m, "%02x", p[i]);
seq_printf(m, "\n%-16lu%s%-14lu%-15u",
(unsigned long)ntohl(eg_entry->ctrl_info.cache_id),
egress_state_string(eg_entry->entry_state),
(eg_entry->ctrl_info.holding_time -
(now.tv_sec-eg_entry->tv.tv_sec)),
(eg_entry->ctrl_info.holding_time - seconds_delta),
eg_entry->packets_rcvd);
/* latest IP address */