IB/core: Add per port immutable struct to ib_device

As of commit 5eb620c81ce3 "IB/core: Add helpers for uncached GID and P_Key
searches"; pkey_tbl_len and gid_tbl_len are immutable data which are stored in
the ib_device.

The per port core capability flags to be added later are also immutable data to
be stored in the ib_device object.

In preparation for this create a structure for per port immutable data and
place the pkey and gid table lengths within this structure.

"get_port_immutable" is added as a mandatory device function to allow the
drivers to fill in this data.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 17 insertions, 2 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index be4465b5df7b..2d3515edc3fa 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1481,6 +1481,11 @@ struct ib_dma_mapping_ops {
 
 struct iw_cm_verbs;
 
+struct ib_port_immutable {
+        int                           pkey_tbl_len;
+        int                           gid_tbl_len;
+};
+
 struct ib_device {
         struct device                *dma_device;
 
@@ -1494,8 +1499,10 @@ struct ib_device {
         struct list_head              client_data_list;
 
         struct ib_cache               cache;
-        int                          *pkey_tbl_len;
-        int                          *gid_tbl_len;
+        /**
+         * port_immutable is indexed by port number
+         */
+        struct ib_port_immutable     *port_immutable;
 
         int                           num_comp_vectors;
 
@@ -1684,6 +1691,14 @@ struct ib_device {
         u32                          local_dma_lkey;
         u8                           node_type;
         u8                           phys_port_cnt;
+
+        /**
+         * The following mandatory functions are used only at device
+         * registration.  Keep functions such as these at the end of this
+         * structure to avoid cache line misses when accessing struct ib_device
+         * in fast paths.
+         */
+        int (*get_port_immutable)(struct ib_device *, u8, struct ib_port_immutable *);
 };
 
 struct ib_client {