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>

5 files changed, 43 insertions, 40 deletions

diff --git a/net/atm/common.c b/net/atm/common.c
index 8a4f99114cd2..5763fd241dc3 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/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>
diff --git a/net/atm/mpc.c b/net/atm/mpc.c
index 7c6a1cc760a2..31e0dcb970f8 100644
--- a/net/atm/mpc.c
+++ b/net/atm/mpc.c
@@ -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);
 
diff --git a/net/atm/mpoa_caches.c b/net/atm/mpoa_caches.c
index e01450bb32d6..4bb418313720 100644
--- a/net/atm/mpoa_caches.c
+++ b/net/atm/mpoa_caches.c
@@ -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",
diff --git a/net/atm/mpoa_caches.h b/net/atm/mpoa_caches.h
index 6a266669ebf4..464c4c7f8d1f 100644
--- a/net/atm/mpoa_caches.h
+++ b/net/atm/mpoa_caches.h
@@ -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;
diff --git a/net/atm/mpoa_proc.c b/net/atm/mpoa_proc.c
index 8a0c17e1c203..2212da9c2da2 100644
--- a/net/atm/mpoa_proc.c
+++ b/net/atm/mpoa_proc.c
@@ -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 */