RDMA/netdev: Hoist alloc_netdev_mqs out of the driver

netdev has several interfaces that expect to call alloc_netdev_mqs from
the core code, with the driver only providing the arguments.  This is
incompatible with the rdma_netdev interface that returns the netdev
directly.

Thus re-organize the API used by ipoib so that the verbs core code calls
alloc_netdev_mqs for the driver. This is done by allowing the drivers to
provide the allocation parameters via a 'get_params' callback and then
initializing an allocated netdev as a second step.

Fixes: cd565b4b51e5 ("IB/IPoIB: Support acceleration options callbacks")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Denis Drozdov <denisd@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index e950c2a68f06..020216cee8f1 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -2223,6 +2223,16 @@ struct rdma_netdev {
 			    union ib_gid *gid, u16 mlid);
 };
 
+struct rdma_netdev_alloc_params {
+	size_t sizeof_priv;
+	unsigned int txqs;
+	unsigned int rxqs;
+	void *param;
+
+	int (*initialize_rdma_netdev)(struct ib_device *device, u8 port_num,
+				      struct net_device *netdev, void *param);
+};
+
 struct ib_port_pkey_list {
 	/* Lock to hold while modifying the list. */
 	spinlock_t                    list_lock;
@@ -2523,8 +2533,8 @@ struct ib_device {
 	/**
 	 * rdma netdev operation
 	 *
-	 * Driver implementing alloc_rdma_netdev must return -EOPNOTSUPP if it
-	 * doesn't support the specified rdma netdev type.
+	 * Driver implementing alloc_rdma_netdev or rdma_netdev_get_params
+	 * must return -EOPNOTSUPP if it doesn't support the specified type.
 	 */
 	struct net_device *(*alloc_rdma_netdev)(
 					struct ib_device *device,
@@ -2534,6 +2544,10 @@ struct ib_device {
 					unsigned char name_assign_type,
 					void (*setup)(struct net_device *));
 
+	int (*rdma_netdev_get_params)(struct ib_device *device, u8 port_num,
+				      enum rdma_netdev_t type,
+				      struct rdma_netdev_alloc_params *params);
+
 	struct module               *owner;
 	struct device                dev;
 	struct kobject               *ports_parent;
@@ -4179,4 +4193,9 @@ struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile);
 
 int uverbs_destroy_def_handler(struct ib_uverbs_file *file,
 			       struct uverbs_attr_bundle *attrs);
+
+struct net_device *rdma_alloc_netdev(struct ib_device *device, u8 port_num,
+				     enum rdma_netdev_t type, const char *name,
+				     unsigned char name_assign_type,
+				     void (*setup)(struct net_device *));
 #endif /* IB_VERBS_H */