IPoIB/cm: Reduce connected mode TX object size

Since IPoIB connected mode does not NETIF_F_SG, we only have one DMA
mapping per send, so we don't need a mapping[] array.  Define a new
struct with a single u64 mapping member and use it for the CM tx_ring.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index a89b9fbe1ef4..0281c8fecc90 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -157,6 +157,11 @@ struct ipoib_tx_buf {
         u64             mapping[MAX_SKB_FRAGS + 1];
 };
 
+struct ipoib_cm_tx_buf {
+        struct sk_buff *skb;
+        u64             mapping;
+};
+
 struct ib_cm_id;
 
 struct ipoib_cm_data {
@@ -215,7 +220,7 @@ struct ipoib_cm_tx {
         struct net_device   *dev;
         struct ipoib_neigh  *neigh;
         struct ipoib_path   *path;
-        struct ipoib_tx_buf *tx_ring;
+        struct ipoib_cm_tx_buf *tx_ring;
         unsigned             tx_head;
         unsigned             tx_tail;
         unsigned long        flags;