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>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index 1f7a659e6e9a..4969c386785e 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/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;
diff --git a/drivers/infiniband/hw/nes/nes_cm.h b/drivers/infiniband/hw/nes/nes_cm.h
index 80bba1892571..8b7e7c0e496e 100644
--- a/drivers/infiniband/hw/nes/nes_cm.h
+++ b/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