RDMA/nes: Increase rexmit timeout interval

Under heavy load with large cluster testing, it may take longer to
receive a response to MPA requests.  Change the driver to wait longer
after each rexmit to max time value.
Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/nes/nes_cm.c

@@ -541,6 +541,7 @@ static void nes_cm_timer_tick(unsigned long pass)
 	struct list_head *list_node;
 	struct nes_cm_core *cm_core = g_cm_core;
 	u32 settimer = 0;
+	unsigned long timetosend;
 	int ret = NETDEV_TX_OK;
 
 	struct list_head timer_list;
@@ -645,8 +646,11 @@ static void nes_cm_timer_tick(unsigned long pass)
 				send_entry->retrycount);
 			if (send_entry->send_retrans) {
 				send_entry->retranscount--;
+				timetosend = (NES_RETRY_TIMEOUT <<
+					(NES_DEFAULT_RETRANS - send_entry->retranscount));
+
 				send_entry->timetosend = jiffies +
-					NES_RETRY_TIMEOUT;
+					min(timetosend, NES_MAX_TIMEOUT);
 				if (nexttimeout > send_entry->timetosend ||
 					!settimer) {
 					nexttimeout = send_entry->timetosend;

drivers/infiniband/hw/nes/nes_cm.h

@@ -149,6 +149,7 @@ struct nes_timer_entry {
 #endif
 #define NES_SHORT_TIME      (10)
 #define NES_LONG_TIME       (2000*HZ/1000)
+#define NES_MAX_TIMEOUT     ((unsigned long) (12*HZ))
 
 #define NES_CM_HASHTABLE_SIZE         1024
 #define NES_CM_TCP_TIMER_INTERVAL     3000