[LLC] timer cleanup: use mod_timer

. Use a smaller default for LLC_ACK_TIME.
. Added much more info about core sock internal state in /proc/net/802.2

include/net/llc_actn.h

@@ -45,4 +45,5 @@ extern int llc_station_ac_report_status(struct llc_station *station,
 					struct sk_buff *skb);
 extern int llc_station_ac_report_status(struct llc_station *station,
 					struct sk_buff *skb);
+extern void llc_station_ack_tmr_cb(unsigned long timeout_data);
 #endif /* LLC_ACTN_H */

include/net/llc_c_ac.h

@@ -211,4 +211,9 @@ extern int llc_conn_ac_send_i_rsp_f_set_ackpf(struct sock* sk,
 					      struct sk_buff *skb);
 extern int llc_conn_ac_send_i_rsp_as_ack(struct sock* sk, struct sk_buff *skb);
 extern int llc_conn_ac_send_i_as_ack(struct sock* sk, struct sk_buff *skb);
+
+extern void llc_conn_busy_tmr_cb(unsigned long timeout_data);
+extern void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data);
+extern void llc_conn_ack_tmr_cb(unsigned long timeout_data);
+extern void llc_conn_rej_tmr_cb(unsigned long timeout_data);
 #endif /* LLC_C_AC_H */

include/net/llc_main.h

@@ -16,7 +16,7 @@
 #define LLC_TYPE_1		 1
 #define LLC_TYPE_2		 2
 #define LLC_P_TIME		 2
-#define LLC_ACK_TIME		 3
+#define LLC_ACK_TIME		 1
 #define LLC_REJ_TIME		 3
 #define LLC_BUSY_TIME		 3
 #define LLC_DEST_INVALID	 0	/* Invalid LLC PDU type */

net/llc/llc_actn.c

@@ -24,16 +24,10 @@
 #include <net/llc_pdu.h>
 #include <net/llc_mac.h>
 
-static void llc_station_ack_tmr_callback(unsigned long timeout_data);
-
 int llc_station_ac_start_ack_timer(struct llc_station *station,
 				   struct sk_buff *skb)
 {
-	del_timer(&station->ack_timer);
-	station->ack_timer.expires  = jiffies + LLC_ACK_TIME * HZ;
-	station->ack_timer.data     = (unsigned long)station;
-	station->ack_timer.function = llc_station_ack_tmr_callback;
-	add_timer(&station->ack_timer);
+	mod_timer(&station->ack_timer, jiffies + LLC_ACK_TIME * HZ);
 	return 0;
 }
 
@@ -130,7 +124,7 @@ int llc_station_ac_report_status(struct llc_station *station,
 	return 0;
 }
 
-static void llc_station_ack_tmr_callback(unsigned long timeout_data)
+void llc_station_ack_tmr_cb(unsigned long timeout_data)
 {
 	struct llc_station *station = (struct llc_station *)timeout_data;
 	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);

net/llc/llc_c_ac.c

@@ -28,10 +28,6 @@
 #include <net/llc_pdu.h>
 #include <net/llc_mac.h>
 
-static void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data);
-static void llc_conn_ack_tmr_cb(unsigned long timeout_data);
-static void llc_conn_rej_tmr_cb(unsigned long timeout_data);
-static void llc_conn_busy_tmr_cb(unsigned long timeout_data);
 static int llc_conn_ac_inc_vs_by_1(struct sock *sk, struct sk_buff *skb);
 static void llc_process_tmr_ev(struct sock *sk, struct sk_buff *skb);
 static int llc_conn_ac_data_confirm(struct sock *sk, struct sk_buff *ev);
@@ -664,11 +660,8 @@ int llc_conn_ac_set_remote_busy(struct sock *sk, struct sk_buff *skb)
 
 	if (!llc->remote_busy_flag) {
 		llc->remote_busy_flag = 1;
-		llc->busy_state_timer.timer.expires = jiffies +
-					llc->busy_state_timer.expire * HZ;
-		llc->busy_state_timer.timer.data     = (unsigned long)sk;
-		llc->busy_state_timer.timer.function = llc_conn_busy_tmr_cb;
-		add_timer(&llc->busy_state_timer.timer);
+		mod_timer(&llc->busy_state_timer.timer,
+			 jiffies + llc->busy_state_timer.expire * HZ);
 	}
 	return 0;
 }
@@ -905,12 +898,8 @@ int llc_conn_ac_start_p_timer(struct sock *sk, struct sk_buff *skb)
 	struct llc_opt *llc = llc_sk(sk);
 
 	llc->p_flag = 1;
-	del_timer(&llc->pf_cycle_timer.timer);
-	llc->pf_cycle_timer.timer.expires  = jiffies +
-						llc->pf_cycle_timer.expire * HZ;
-	llc->pf_cycle_timer.timer.data     = (unsigned long)sk;
-	llc->pf_cycle_timer.timer.function = llc_conn_pf_cycle_tmr_cb;
-	add_timer(&llc->pf_cycle_timer.timer);
+	mod_timer(&llc->pf_cycle_timer.timer,
+		  jiffies + llc->pf_cycle_timer.expire * HZ);
 	return 0;
 }
 
@@ -1181,11 +1170,7 @@ int llc_conn_ac_start_ack_timer(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_opt *llc = llc_sk(sk);
 
-	del_timer(&llc->ack_timer.timer);
-	llc->ack_timer.timer.expires  = jiffies + llc->ack_timer.expire * HZ;
-	llc->ack_timer.timer.data     = (unsigned long)sk;
-	llc->ack_timer.timer.function = llc_conn_ack_tmr_cb;
-	add_timer(&llc->ack_timer.timer);
+	mod_timer(&llc->ack_timer.timer, jiffies + llc->ack_timer.expire * HZ);
 	return 0;
 }
 
@@ -1193,12 +1178,8 @@ int llc_conn_ac_start_rej_timer(struct sock *sk, struct sk_buff *skb)
 {
 	struct llc_opt *llc = llc_sk(sk);
 
-	del_timer(&llc->rej_sent_timer.timer);
-	llc->rej_sent_timer.timer.expires = jiffies +
-					    llc->rej_sent_timer.expire * HZ;
-	llc->rej_sent_timer.timer.data     = (unsigned long)sk;
-	llc->rej_sent_timer.timer.function = llc_conn_rej_tmr_cb;
-	add_timer(&llc->rej_sent_timer.timer);
+	mod_timer(&llc->rej_sent_timer.timer,
+		  jiffies + llc->rej_sent_timer.expire * HZ);
 	return 0;
 }
 
@@ -1207,13 +1188,9 @@ int llc_conn_ac_start_ack_tmr_if_not_running(struct sock *sk,
 {
 	struct llc_opt *llc = llc_sk(sk);
 
-	if (!timer_pending(&llc->ack_timer.timer)) {
-		llc->ack_timer.timer.expires  = jiffies +
-						llc->ack_timer.expire * HZ;
-		llc->ack_timer.timer.data     = (unsigned long)sk;
-		llc->ack_timer.timer.function = llc_conn_ack_tmr_cb;
-		add_timer(&llc->ack_timer.timer);
-	}
+	if (!timer_pending(&llc->ack_timer.timer))
+		mod_timer(&llc->ack_timer.timer,
+			  jiffies + llc->ack_timer.expire * HZ);
 	return 0;
 }
 
@@ -1260,13 +1237,9 @@ int llc_conn_ac_upd_nr_received(struct sock *sk, struct sk_buff *skb)
 			llc->failed_data_req = 0;
 			llc_conn_ac_data_confirm(sk, skb);
 		}
-		if (unacked) {
-			llc->ack_timer.timer.expires  = jiffies +
-						   llc->ack_timer.expire * HZ;
-			llc->ack_timer.timer.data     = (unsigned long)sk;
-			llc->ack_timer.timer.function = llc_conn_ack_tmr_cb;
-			add_timer(&llc->ack_timer.timer);
-	       }
+		if (unacked)
+			mod_timer(&llc->ack_timer.timer,
+				  jiffies + llc->ack_timer.expire * HZ);
 	} else if (llc->failed_data_req) {
 		llc_pdu_decode_pf_bit(skb, &fbit);
 		if (fbit == 1) {
@@ -1413,7 +1386,7 @@ void llc_conn_pf_cycle_tmr_cb(unsigned long timeout_data)
 	bh_unlock_sock(sk);
 }
 
-static void llc_conn_busy_tmr_cb(unsigned long timeout_data)
+void llc_conn_busy_tmr_cb(unsigned long timeout_data)
 {
 	struct sock *sk = (struct sock *)timeout_data;
 	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
@@ -1445,7 +1418,7 @@ void llc_conn_ack_tmr_cb(unsigned long timeout_data)
 	bh_unlock_sock(sk);
 }
 
-static void llc_conn_rej_tmr_cb(unsigned long timeout_data)
+void llc_conn_rej_tmr_cb(unsigned long timeout_data)
 {
 	struct sock *sk = (struct sock *)timeout_data;
 	struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);

net/llc/llc_main.c

@@ -184,19 +184,32 @@ int llc_sk_init(struct sock* sk)
 		goto out;
 	memset(llc, 0, sizeof(*llc));
 	rc = 0;
+
 	llc->sk	      = sk;
 	llc->state    = LLC_CONN_STATE_ADM;
 	llc->inc_cntr = llc->dec_cntr = 2;
 	llc->dec_step = llc->connect_step = 1;
+
 	llc->ack_timer.expire	      = LLC_ACK_TIME;
+	llc->ack_timer.timer.data     = (unsigned long)sk;
+	llc->ack_timer.timer.function = llc_conn_ack_tmr_cb;
+
 	llc->pf_cycle_timer.expire	   = LLC_P_TIME;
+	llc->pf_cycle_timer.timer.data     = (unsigned long)sk;
+	llc->pf_cycle_timer.timer.function = llc_conn_pf_cycle_tmr_cb;
+
 	llc->rej_sent_timer.expire	   = LLC_REJ_TIME;
+	llc->rej_sent_timer.timer.data     = (unsigned long)sk;
+	llc->rej_sent_timer.timer.function = llc_conn_rej_tmr_cb;
+
 	llc->busy_state_timer.expire	     = LLC_BUSY_TIME;
+	llc->busy_state_timer.timer.data     = (unsigned long)sk;
+	llc->busy_state_timer.timer.function = llc_conn_busy_tmr_cb;
+
 	llc->n2 = 2;   /* max retransmit */
 	llc->k  = 2;   /* tx win size, will adjust dynam */
 	llc->rw = 128; /* rx win size (opt and equal to
-					     * tx_win of remote LLC)
-					     */
+		        * tx_win of remote LLC) */
 	skb_queue_head_init(&llc->pdu_unack_q);
 	sk->backlog_rcv = llc_backlog_rcv;
 	llc_sk(sk) = llc;
@@ -534,6 +547,21 @@ struct sk_buff *llc_alloc_frame(void)
 	return skb;
 }
 
+static char *llc_conn_state_names[] = {
+	[LLC_CONN_STATE_ADM] =        "adm", 
+	[LLC_CONN_STATE_SETUP] =      "setup", 
+	[LLC_CONN_STATE_NORMAL] =     "normal",
+	[LLC_CONN_STATE_BUSY] =       "busy", 
+	[LLC_CONN_STATE_REJ] =        "rej", 
+	[LLC_CONN_STATE_AWAIT] =      "await", 
+	[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
+	[LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
+	[LLC_CONN_STATE_D_CONN]	=     "d_conn",
+	[LLC_CONN_STATE_RESET] =      "reset", 
+	[LLC_CONN_STATE_ERROR] =      "error", 
+	[LLC_CONN_STATE_TEMP] =       "temp", 
+};
+
 static int llc_proc_get_info(char *bf, char **start, off_t offset, int length)
 {
 	struct llc_opt *llc;
@@ -546,19 +574,34 @@ static int llc_proc_get_info(char *bf, char **start, off_t offset, int length)
 		struct llc_sap *sap = list_entry(sap_entry, struct llc_sap,
 						 node);
 
-		len += sprintf(bf + len, "lsap=%d\n", sap->laddr.lsap);
+		len += sprintf(bf + len, "lsap=%02X\n", sap->laddr.lsap);
 		spin_lock_bh(&sap->sk_list.lock);
 		if (list_empty(&sap->sk_list.list)) {
 			len += sprintf(bf + len, "no connections\n");
 			goto unlock;
 		}
-		len += sprintf(bf + len,
-				"connection list:\nstate  retr txwin rxwin\n");
+		len += sprintf(bf + len, "connection list:\n"
+					 "dsap state      retr txw rxw "
+					 "pf ff sf df rs cs "
+					 "tack tpfc trs tbs blog busr\n");
 		list_for_each(llc_entry, &sap->sk_list.list) {
 			llc = list_entry(llc_entry, struct llc_opt, node);
-			len += sprintf(bf + len, "  %-5d%-5d%-6d%-5d\n",
-					llc->state, llc->retry_count, llc->k,
-					llc->rw);
+			len += sprintf(bf + len, " %02X  %-10s %3d  %3d %3d "
+						 "%2d %2d %2d "
+						 "%2d %2d %2d "
+						 "%4d %4d %3d %3d %4d %4d\n",
+				       llc->daddr.lsap,
+				       llc_conn_state_names[llc->state],
+				       llc->retry_count, llc->k, llc->rw,
+				       llc->p_flag, llc->f_flag, llc->s_flag,
+				       llc->data_flag, llc->remote_busy_flag,
+				       llc->cause_flag,
+				       timer_pending(&llc->ack_timer.timer),
+				       timer_pending(&llc->pf_cycle_timer.timer),
+				       timer_pending(&llc->rej_sent_timer.timer),
+				       timer_pending(&llc->busy_state_timer.timer),
+				       !!llc->sk->backlog.tail,
+				       llc->sk->lock.users);
 		}
 unlock:	
 		spin_unlock_bh(&sap->sk_list.lock);
@@ -608,6 +651,9 @@ static int __init llc_init(void)
 	skb_queue_head_init(&llc_main_station.mac_pdu_q);
 	skb_queue_head_init(&llc_main_station.ev_q.list);
 	spin_lock_init(&llc_main_station.ev_q.lock);
+	llc_main_station.ack_timer.data     = (unsigned long)&llc_main_station;
+	llc_main_station.ack_timer.function = llc_station_ack_tmr_cb;
+
 	skb = alloc_skb(0, GFP_ATOMIC);
 	if (!skb)
 		goto err;