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Commit 8aa08602 authored by Sean Hefty's avatar Sean Hefty Committed by Roland Dreier
Browse files

RDMA/cma: Simplify device removal handling code 



Add a new routine and rename another to encapsulate common code for
synchronizing with device removal.

Signed-off-by: default avatarSean Hefty <sean.hefty@intel.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
parent 4e430dcb

drivers/infiniband/core/cma.c

+48 −41
Original line number Diff line number Diff line
@@ -346,7 +346,23 @@ static void cma_deref_id(struct rdma_id_private *id_priv) 
		complete(&id_priv->comp);

}



static void cma_release_remove(struct rdma_id_private *id_priv)

static int cma_disable_remove(struct rdma_id_private *id_priv,

			      enum cma_state state)

{

	unsigned long flags;

	int ret;



	spin_lock_irqsave(&id_priv->lock, flags);

	if (id_priv->state == state) {

		atomic_inc(&id_priv->dev_remove);

		ret = 0;

	} else

		ret = -EINVAL;

	spin_unlock_irqrestore(&id_priv->lock, flags);

	return ret;

}



static void cma_enable_remove(struct rdma_id_private *id_priv)

{

	if (atomic_dec_and_test(&id_priv->dev_remove))

		wake_up(&id_priv->wait_remove);
@@ -884,9 +900,8 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 
	struct rdma_cm_event event;

	int ret = 0;



	atomic_inc(&id_priv->dev_remove);

	if (!cma_comp(id_priv, CMA_CONNECT))

		goto out;

	if (cma_disable_remove(id_priv, CMA_CONNECT))

		return 0;



	memset(&event, 0, sizeof event);

	switch (ib_event->event) {
@@ -942,12 +957,12 @@ static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 
		/* Destroy the CM ID by returning a non-zero value. */

		id_priv->cm_id.ib = NULL;

		cma_exch(id_priv, CMA_DESTROYING);

		cma_release_remove(id_priv);

		cma_enable_remove(id_priv);

		rdma_destroy_id(&id_priv->id);

		return ret;

	}

out:

	cma_release_remove(id_priv);

	cma_enable_remove(id_priv);

	return ret;

}
@@ -1057,11 +1072,8 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 
	int offset, ret;



	listen_id = cm_id->context;

	atomic_inc(&listen_id->dev_remove);

	if (!cma_comp(listen_id, CMA_LISTEN)) {

		ret = -ECONNABORTED;

		goto out;

	}

	if (cma_disable_remove(listen_id, CMA_LISTEN))

		return -ECONNABORTED;



	memset(&event, 0, sizeof event);

	offset = cma_user_data_offset(listen_id->id.ps);
@@ -1101,11 +1113,11 @@ static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event) 


release_conn_id:

	cma_exch(conn_id, CMA_DESTROYING);

	cma_release_remove(conn_id);

	cma_enable_remove(conn_id);

	rdma_destroy_id(&conn_id->id);



out:

	cma_release_remove(listen_id);

	cma_enable_remove(listen_id);

	return ret;

}
@@ -1214,12 +1226,12 @@ static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event) 
		/* Destroy the CM ID by returning a non-zero value. */

		id_priv->cm_id.iw = NULL;

		cma_exch(id_priv, CMA_DESTROYING);

		cma_release_remove(id_priv);

		cma_enable_remove(id_priv);

		rdma_destroy_id(&id_priv->id);

		return ret;

	}



	cma_release_remove(id_priv);

	cma_enable_remove(id_priv);

	return ret;

}
@@ -1234,11 +1246,8 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id, 
	int ret;



	listen_id = cm_id->context;

	atomic_inc(&listen_id->dev_remove);

	if (!cma_comp(listen_id, CMA_LISTEN)) {

		ret = -ECONNABORTED;

		goto out;

	}

	if (cma_disable_remove(listen_id, CMA_LISTEN))

		return -ECONNABORTED;



	/* Create a new RDMA id for the new IW CM ID */

	new_cm_id = rdma_create_id(listen_id->id.event_handler,
@@ -1255,13 +1264,13 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id, 
	dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);

	if (!dev) {

		ret = -EADDRNOTAVAIL;

		cma_release_remove(conn_id);

		cma_enable_remove(conn_id);

		rdma_destroy_id(new_cm_id);

		goto out;

	}

	ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);

	if (ret) {

		cma_release_remove(conn_id);

		cma_enable_remove(conn_id);

		rdma_destroy_id(new_cm_id);

		goto out;

	}
@@ -1270,7 +1279,7 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id, 
	ret = cma_acquire_dev(conn_id);

	mutex_unlock(&lock);

	if (ret) {

		cma_release_remove(conn_id);

		cma_enable_remove(conn_id);

		rdma_destroy_id(new_cm_id);

		goto out;

	}
@@ -1293,14 +1302,14 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id, 
		/* User wants to destroy the CM ID */

		conn_id->cm_id.iw = NULL;

		cma_exch(conn_id, CMA_DESTROYING);

		cma_release_remove(conn_id);

		cma_enable_remove(conn_id);

		rdma_destroy_id(&conn_id->id);

	}



out:

	if (dev)

		dev_put(dev);

	cma_release_remove(listen_id);

	cma_enable_remove(listen_id);

	return ret;

}
@@ -1519,7 +1528,7 @@ static void cma_work_handler(struct work_struct *_work) 
		destroy = 1;

	}

out:

	cma_release_remove(id_priv);

	cma_enable_remove(id_priv);

	cma_deref_id(id_priv);

	if (destroy)

		rdma_destroy_id(&id_priv->id);
@@ -1711,13 +1720,13 @@ static void addr_handler(int status, struct sockaddr *src_addr, 


	if (id_priv->id.event_handler(&id_priv->id, &event)) {

		cma_exch(id_priv, CMA_DESTROYING);

		cma_release_remove(id_priv);

		cma_enable_remove(id_priv);

		cma_deref_id(id_priv);

		rdma_destroy_id(&id_priv->id);

		return;

	}

out:

	cma_release_remove(id_priv);

	cma_enable_remove(id_priv);

	cma_deref_id(id_priv);

}
@@ -2042,11 +2051,10 @@ static int cma_sidr_rep_handler(struct ib_cm_id *cm_id, 
	struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;

	int ret = 0;



	memset(&event, 0, sizeof event);

	atomic_inc(&id_priv->dev_remove);

	if (!cma_comp(id_priv, CMA_CONNECT))

		goto out;

	if (cma_disable_remove(id_priv, CMA_CONNECT))

		return 0;



	memset(&event, 0, sizeof event);

	switch (ib_event->event) {

	case IB_CM_SIDR_REQ_ERROR:

		event.event = RDMA_CM_EVENT_UNREACHABLE;
@@ -2084,12 +2092,12 @@ static int cma_sidr_rep_handler(struct ib_cm_id *cm_id, 
		/* Destroy the CM ID by returning a non-zero value. */

		id_priv->cm_id.ib = NULL;

		cma_exch(id_priv, CMA_DESTROYING);

		cma_release_remove(id_priv);

		cma_enable_remove(id_priv);

		rdma_destroy_id(&id_priv->id);

		return ret;

	}

out:

	cma_release_remove(id_priv);

	cma_enable_remove(id_priv);

	return ret;

}
@@ -2499,10 +2507,9 @@ static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast) 
	int ret;



	id_priv = mc->id_priv;

	atomic_inc(&id_priv->dev_remove);

	if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&

	    !cma_comp(id_priv, CMA_ADDR_RESOLVED))

		goto out;

	if (cma_disable_remove(id_priv, CMA_ADDR_BOUND) &&

	    cma_disable_remove(id_priv, CMA_ADDR_RESOLVED))

		return 0;



	if (!status && id_priv->id.qp)

		status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
@@ -2524,12 +2531,12 @@ static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast) 
	ret = id_priv->id.event_handler(&id_priv->id, &event);

	if (ret) {

		cma_exch(id_priv, CMA_DESTROYING);

		cma_release_remove(id_priv);

		cma_enable_remove(id_priv);

		rdma_destroy_id(&id_priv->id);

		return 0;

	}

out:

	cma_release_remove(id_priv);



	cma_enable_remove(id_priv);

	return 0;

}