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Commit ae78ff3a authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Jason Gunthorpe
Browse files

RDMA/cm: Convert local_id_table to XArray 



Also introduce cm_local_id() to reduce the amount of boilerplate when
converting a local ID to an XArray index.

Signed-off-by: default avatarMatthew Wilcox <willy@infradead.org>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent 949a2370

drivers/infiniband/core/cm.c

+18 −24
Original line number Diff line number Diff line
@@ -124,7 +124,8 @@ static struct ib_cm { 
	struct rb_root remote_qp_table;

	struct rb_root remote_id_table;

	struct rb_root remote_sidr_table;

	struct idr local_id_table;

	struct xarray local_id_table;

	u32 local_id_next;

	__be32 random_id_operand;

	struct list_head timewait_list;

	struct workqueue_struct *wq;
@@ -598,35 +599,31 @@ static int cm_init_av_by_path(struct sa_path_rec *path, 


static int cm_alloc_id(struct cm_id_private *cm_id_priv)

{

	unsigned long flags;

	int id;



	idr_preload(GFP_KERNEL);

	spin_lock_irqsave(&cm.lock, flags);



	id = idr_alloc_cyclic(&cm.local_id_table, cm_id_priv, 0, 0, GFP_NOWAIT);

	int err;

	u32 id;



	spin_unlock_irqrestore(&cm.lock, flags);

	idr_preload_end();

	err = xa_alloc_cyclic_irq(&cm.local_id_table, &id, cm_id_priv,

			xa_limit_32b, &cm.local_id_next, GFP_KERNEL);



	cm_id_priv->id.local_id = (__force __be32)id ^ cm.random_id_operand;

	return id < 0 ? id : 0;

	return err;

}



static u32 cm_local_id(__be32 local_id)

{

	return (__force u32) (local_id ^ cm.random_id_operand);

}



static void cm_free_id(__be32 local_id)

{

	spin_lock_irq(&cm.lock);

	idr_remove(&cm.local_id_table,

		   (__force int) (local_id ^ cm.random_id_operand));

	spin_unlock_irq(&cm.lock);

	xa_erase_irq(&cm.local_id_table, cm_local_id(local_id));

}



static struct cm_id_private * cm_get_id(__be32 local_id, __be32 remote_id)

{

	struct cm_id_private *cm_id_priv;



	cm_id_priv = idr_find(&cm.local_id_table,

			      (__force int) (local_id ^ cm.random_id_operand));

	cm_id_priv = xa_load(&cm.local_id_table, cm_local_id(local_id));

	if (cm_id_priv) {

		if (cm_id_priv->id.remote_id == remote_id)

			atomic_inc(&cm_id_priv->refcount);
@@ -2824,9 +2821,8 @@ static struct cm_id_private * cm_acquire_rejected_id(struct cm_rej_msg *rej_msg) 
			spin_unlock_irq(&cm.lock);

			return NULL;

		}

		cm_id_priv = idr_find(&cm.local_id_table, (__force int)

				      (timewait_info->work.local_id ^

				       cm.random_id_operand));

		cm_id_priv = xa_load(&cm.local_id_table,

				cm_local_id(timewait_info->work.local_id));

		if (cm_id_priv) {

			if (cm_id_priv->id.remote_id == remote_id)

				atomic_inc(&cm_id_priv->refcount);
@@ -4512,7 +4508,7 @@ static int __init ib_cm_init(void) 
	cm.remote_id_table = RB_ROOT;

	cm.remote_qp_table = RB_ROOT;

	cm.remote_sidr_table = RB_ROOT;

	idr_init(&cm.local_id_table);

	xa_init_flags(&cm.local_id_table, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);

	get_random_bytes(&cm.random_id_operand, sizeof cm.random_id_operand);

	INIT_LIST_HEAD(&cm.timewait_list);
@@ -4538,7 +4534,6 @@ static int __init ib_cm_init(void) 
error2:

	class_unregister(&cm_class);

error1:

	idr_destroy(&cm.local_id_table);

	return ret;

}
@@ -4560,9 +4555,8 @@ static void __exit ib_cm_cleanup(void) 
	}



	class_unregister(&cm_class);

	idr_destroy(&cm.local_id_table);

	WARN_ON(!xa_empty(&cm.local_id_table));

}



module_init(ib_cm_init);

module_exit(ib_cm_cleanup);