[PATCH rdma-next v1 1/3] RDMA/core: Share driver structure size with core

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From: Leon Romanovsky <leonro@xxxxxxxxxxxx>

Add new macros to be used in drivers while registering ops structure
and IB/core while calling allocation routines, so drivers won't need
to perform kzalloc/kfree in their paths.

The change in allocation stage allows us to initialize common fields
prior to calling to drivers (e.g. restrack).

Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
 drivers/infiniband/core/device.c |  2 ++
 include/rdma/ib_verbs.h          | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index d13491b416dc..c332398376fc 100644
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -1221,6 +1221,8 @@ void ib_set_device_ops(struct ib_device *dev, const struct ib_device_ops *ops)
 				(ptr)->name = ops->name;                       \
 	} while (0)
 
+#define SET_OBJ_SIZE(ptr, name) SET_DEVICE_OP(ptr, size_##name)
+
 	SET_DEVICE_OP(dev_ops, add_gid);
 	SET_DEVICE_OP(dev_ops, advise_mr);
 	SET_DEVICE_OP(dev_ops, alloc_dm);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index d54c87640f89..4423de3b3738 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2264,6 +2264,19 @@ struct ib_counters_read_attr {
 
 struct uverbs_attr_bundle;
 
+#define INIT_RDMA_OBJ_SIZE(ib_struct, drv_struct, member)                      \
+	.size_##ib_struct =                                                    \
+		(sizeof(struct drv_struct) +                                   \
+		 BUILD_BUG_ON_ZERO(offsetof(struct drv_struct, member)) +      \
+		 BUILD_BUG_ON_ZERO(                                            \
+			 !__same_type(((struct drv_struct *)NULL)->member,     \
+				      struct ib_struct)))
+
+#define rdma_zalloc_drv_obj(ib_dev, ib_type)                                   \
+	kzalloc(ib_dev->ops.size_##ib_type, GFP_KERNEL)
+
+#define DECLARE_RDMA_OBJ_SIZE(ib_struct) size_t size_##ib_struct
+
 /**
  * struct ib_device_ops - InfiniBand device operations
  * This structure defines all the InfiniBand device operations, providers will
-- 
2.19.1




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