RDMA/core: Add helper function to retrieve driver gid context from gid attr

Adding a helper function to retrieve the driver gid context from the gid
attr.

Link: https://lore.kernel.org/r/1582107594-5180-2-git-send-email-selvin.xavier@broadcom.com
Suggested-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 17bfedd..9bbdace 100644 (file)
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -973,6 +973,23 @@ done:
 EXPORT_SYMBOL(rdma_query_gid);
 
 /**
+ * rdma_read_gid_hw_context - Read the HW GID context from GID attribute
+ * @attr:              Potinter to the GID attribute
+ *
+ * rdma_read_gid_hw_context() reads the drivers GID HW context corresponding
+ * to the SGID attr. Callers are required to already be holding the reference
+ * to an existing GID entry.
+ *
+ * Returns the HW GID context
+ *
+ */
+void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr)
+{
+       return container_of(attr, struct ib_gid_table_entry, attr)->context;
+}
+EXPORT_SYMBOL(rdma_read_gid_hw_context);
+
+/**
  * rdma_find_gid - Returns SGID attributes if the matching GID is found.
  * @device: The device to query.
  * @gid: The GID value to search for.

diff --git a/include/rdma/ib_cache.h b/include/rdma/ib_cache.h
index 870b5e6..e06d133 100644 (file)
--- a/include/rdma/ib_cache.h
+++ b/include/rdma/ib_cache.h
@@ -39,6 +39,7 @@
 
 int rdma_query_gid(struct ib_device *device, u8 port_num, int index,
                   union ib_gid *gid);
+void *rdma_read_gid_hw_context(const struct ib_gid_attr *attr);
 const struct ib_gid_attr *rdma_find_gid(struct ib_device *device,
                                        const union ib_gid *gid,
                                        enum ib_gid_type gid_type,