RDMA/core: Add local DMA L_Key support

- Change the IB_DEVICE_ZERO_STAG flag to the transport-neutral name
  IB_DEVICE_LOCAL_DMA_LKEY, which is used by iWARP RNICs to indicate 0
  STag support and IB HCAs to indicate reserved L_Key support.

- Add a u32 local_dma_lkey member to struct ib_device.  Drivers fill
  this in with the appropriate local DMA L_Key (if they support it).

- Fix up the drivers using this flag.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 07b41e05565a..90b529f7a154 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -91,7 +91,7 @@ enum ib_device_cap_flags {
         IB_DEVICE_RC_RNR_NAK_GEN        = (1<<12),
         IB_DEVICE_SRQ_RESIZE            = (1<<13),
         IB_DEVICE_N_NOTIFY_CQ           = (1<<14),
-        IB_DEVICE_ZERO_STAG             = (1<<15),
+        IB_DEVICE_LOCAL_DMA_LKEY        = (1<<15),
         IB_DEVICE_RESERVED              = (1<<16), /* old SEND_W_INV */
         IB_DEVICE_MEM_WINDOW            = (1<<17),
         /*
@@ -1149,6 +1149,7 @@ struct ib_device {
 
         char                         node_desc[64];
         __be64                       node_guid;
+        u32                          local_dma_lkey;
         u8                           node_type;
         u8                           phys_port_cnt;
 };