IPoIB: Make send and receive queue sizes tunable

Make IPoIB's send and receive queue sizes tunable via module
parameters ("send_queue_size" and "recv_queue_size").  This allows the
queue sizes to be enlarged to fix disastrously bad performance on some
platforms and workloads, without bloating memory usage when large
queues aren't needed.

Signed-off-by: Shirley Ma <xma@us.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index 374109df7303..12a1e0572ef2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -65,6 +65,8 @@ enum {
 
         IPOIB_RX_RING_SIZE        = 128,
         IPOIB_TX_RING_SIZE        = 64,
+        IPOIB_MAX_QUEUE_SIZE      = 8192,
+        IPOIB_MIN_QUEUE_SIZE      = 2,
 
         IPOIB_NUM_WC              = 4,
 
@@ -332,6 +334,8 @@ static inline void ipoib_unregister_debugfs(void) { }
 #define ipoib_warn(priv, format, arg...)                \
         ipoib_printk(KERN_WARNING, priv, format , ## arg)
 
+extern int ipoib_sendq_size;
+extern int ipoib_recvq_size;
 
 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
 extern int ipoib_debug_level;