[PATCH] NET: ATM: MPOA: Remove 32-bit timekeeping

From: Tina Ruchandani
Date: Fri Oct 30 2015 - 01:01:21 EST

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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@xxxxxxxxx>
---
net/atm/common.c | 2 +-
net/atm/mpc.c | 9 +++++----
net/atm/mpoa_caches.c | 49 ++++++++++++++++++++++++-------------------------
net/atm/mpoa_caches.h | 9 +++++----
net/atm/mpoa_proc.c | 15 +++++++++------
5 files changed, 44 insertions(+), 40 deletions(-)

diff --git a/net/atm/common.c b/net/atm/common.c
index 49a872d..a48a1ac 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -14,7 +14,7 @@
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/sched.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>
diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index 0e98222..211468e 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -1090,7 +1090,7 @@ 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_real_seconds();
mpc->in_ops->put(entry);
return;
}
@@ -1100,7 +1100,7 @@ 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_real_seconds();
mpc->in_ops->put(entry);
return;
}
@@ -1176,8 +1176,9 @@ 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->tv = ktime_get_real_seconds();
+ /* Used in refreshing func from now on */
+ entry->reply_wait = ktime_get_real_seconds();
entry->refresh_time = 0;
ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);

diff --git a/net/atm/mpoa_caches.c b/net/atm/mpoa_caches.c
index d1b2d9a..2a59830 100644
--- a/net/atm/mpoa_caches.c
+++ b/net/atm/mpoa_caches.c
@@ -116,7 +116,7 @@ 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->tv = ktime_get_real_seconds();
entry->retry_time = client->parameters.mpc_p4;
entry->count = 1;
entry->entry_state = INGRESS_INVALID;
@@ -147,7 +147,7 @@ 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_real_seconds();
entry->entry_state = INGRESS_RESOLVING;
}
if (entry->shortcut != NULL)
@@ -170,7 +170,7 @@ 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_real_seconds();
}

return CLOSED;
@@ -226,17 +226,16 @@ 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_real_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->tv) > 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);
@@ -252,35 +251,36 @@ 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_real_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_real_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;
@@ -288,7 +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_real_seconds();
}
}
entry = entry->next;
@@ -299,18 +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_real_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;
@@ -479,7 +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->tv = ktime_get_real_seconds();
entry->entry_state = EGRESS_RESOLVED;
dprintk("new_eg_cache_entry cache_id %u\n",
ntohl(entry->ctrl_info.cache_id));
@@ -494,7 +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->tv = ktime_get_real_seconds();
entry->entry_state = EGRESS_RESOLVED;
entry->ctrl_info.holding_time = holding_time;
}
@@ -502,17 +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_real_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->tv) > 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",
diff --git a/net/atm/mpoa_caches.h b/net/atm/mpoa_caches.h
index 8e5f78c..874fded 100644
--- a/net/atm/mpoa_caches.h
+++ b/net/atm/mpoa_caches.h
@@ -1,6 +1,7 @@
#ifndef MPOA_CACHES_H
#define MPOA_CACHES_H

+#include <linux/time64.h>
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/atm.h>
@@ -14,9 +15,9 @@ 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 tv;
+ time64_t reply_wait;
+ time64_t hold_down;
uint32_t packets_fwded;
uint16_t entry_state;
uint32_t retry_time;
@@ -51,7 +52,7 @@ struct in_cache_ops{
typedef struct eg_cache_entry{
struct eg_cache_entry *next;
struct eg_cache_entry *prev;
- struct timeval tv;
+ time64_t tv;
uint8_t MPS_ctrl_ATM_addr[ATM_ESA_LEN];
struct atm_vcc *shortcut;
uint32_t packets_rcvd;
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
index 2df34eb..06f2920 100644
--- a/net/atm/mpoa_proc.c
+++ b/net/atm/mpoa_proc.c
@@ -7,7 +7,7 @@
#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>
@@ -137,7 +137,7 @@ 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) {
@@ -147,15 +147,17 @@ 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_real_seconds();

for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {
+ unsigned long seconds_delta = now - in_entry->tv;
+
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",
@@ -168,13 +170,14 @@ 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->tv;
+
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 */
--
2.6.0.rc2.230.g3dd15c0

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