From: Selvin Xavier <selvin.xavier@broadcom.com>
Date: Wed, 19 Feb 2020 02:19:53 -0800
Subject: RDMA/core: Add helper function to retrieve driver gid context from
 gid attr
Patch-mainline: v5.7-rc1
Git-commit: 779820c2e1e9251ddfdce5dd43b0bba30cd22271
References: bsc#1170774

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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/cache.c |   17 +++++++++++++++++
 include/rdma/ib_cache.h         |    1 +
 2 files changed, 18 insertions(+)

--- 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.
--- 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,