[infiniband] Return status code from ib_create_cq() and ib_create_qp()

Any underlying errors arising during ib_create_cq() or ib_create_qp()
are lost since the functions simply return NULL on error.  This makes
debugging harder, since a debug-enabled build is required to discover
the root cause of the error.

Fix by returning a status code from these functions, thereby allowing
any underlying errors to be propagated.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

3 files changed, 45 insertions, 40 deletions

diff --git a/src/net/infiniband.c b/src/net/infiniband.c
index 15ff0529..fa45653e 100644
--- a/src/net/infiniband.c
+++ b/src/net/infiniband.c
@@ -92,11 +92,12 @@ struct errortab infiniband_errors[] __errortab = {
  * @v ibdev		Infiniband device
  * @v num_cqes		Number of completion queue entries
  * @v op		Completion queue operations
- * @ret cq		New completion queue
+ * @v new_cq		New completion queue to fill in
+ * @ret rc		Return status code
  */
-struct ib_completion_queue *
-ib_create_cq ( struct ib_device *ibdev, unsigned int num_cqes,
-	       struct ib_completion_queue_operations *op ) {
+int ib_create_cq ( struct ib_device *ibdev, unsigned int num_cqes,
+		   struct ib_completion_queue_operations *op,
+		   struct ib_completion_queue **new_cq ) {
 	struct ib_completion_queue *cq;
 	int rc;
 
@@ -104,8 +105,10 @@ ib_create_cq ( struct ib_device *ibdev, unsigned int num_cqes,
 
 	/* Allocate and initialise data structure */
 	cq = zalloc ( sizeof ( *cq ) );
-	if ( ! cq )
+	if ( ! cq ) {
+		rc = -ENOMEM;
 		goto err_alloc_cq;
+	}
 	cq->ibdev = ibdev;
 	list_add_tail ( &cq->list, &ibdev->cqs );
 	cq->num_cqes = num_cqes;
@@ -122,14 +125,15 @@ ib_create_cq ( struct ib_device *ibdev, unsigned int num_cqes,
 	DBGC ( ibdev, "IBDEV %s created %d-entry completion queue %p (%p) "
 	       "with CQN %#lx\n", ibdev->name, num_cqes, cq,
 	       ib_cq_get_drvdata ( cq ), cq->cqn );
-	return cq;
+	*new_cq = cq;
+	return 0;
 
 	ibdev->op->destroy_cq ( ibdev, cq );
  err_dev_create_cq:
 	list_del ( &cq->list );
 	free ( cq );
  err_alloc_cq:
-	return NULL;
+	return rc;
 }
 
 /**
@@ -186,19 +190,19 @@ void ib_poll_cq ( struct ib_device *ibdev,
  * @v recv_cq		Receive completion queue
  * @v op		Queue pair operations
  * @v name		Queue pair name
- * @ret qp		Queue pair
+ * @v new_qp		New queue pair to fill in
+ * @ret rc		Return status code
  *
  * The queue pair will be left in the INIT state; you must call
  * ib_modify_qp() before it is ready to use for sending and receiving.
  */
-struct ib_queue_pair * ib_create_qp ( struct ib_device *ibdev,
-				      enum ib_queue_pair_type type,
-				      unsigned int num_send_wqes,
-				      struct ib_completion_queue *send_cq,
-				      unsigned int num_recv_wqes,
-				      struct ib_completion_queue *recv_cq,
-				      struct ib_queue_pair_operations *op,
-				      const char *name ) {
+int ib_create_qp ( struct ib_device *ibdev, enum ib_queue_pair_type type,
+		   unsigned int num_send_wqes,
+		   struct ib_completion_queue *send_cq,
+		   unsigned int num_recv_wqes,
+		   struct ib_completion_queue *recv_cq,
+		   struct ib_queue_pair_operations *op, const char *name,
+		   struct ib_queue_pair **new_qp ) {
 	struct ib_queue_pair *qp;
 	size_t total_size;
 	int rc;
@@ -210,8 +214,10 @@ struct ib_queue_pair * ib_create_qp ( struct ib_device *ibdev,
 		       ( num_send_wqes * sizeof ( qp->send.iobufs[0] ) ) +
 		       ( num_recv_wqes * sizeof ( qp->recv.iobufs[0] ) ) );
 	qp = zalloc ( total_size );
-	if ( ! qp )
+	if ( ! qp ) {
+		rc = -ENOMEM;
 		goto err_alloc_qp;
+	}
 	qp->ibdev = ibdev;
 	list_add_tail ( &qp->list, &ibdev->qps );
 	qp->type = type;
@@ -265,7 +271,8 @@ struct ib_queue_pair * ib_create_qp ( struct ib_device *ibdev,
 		       ibdev->name, qp->qpn, qp->ext_qpn );
 	}
 
-	return qp;
+	*new_qp = qp;
+	return 0;
 
 	ibdev->op->destroy_qp ( ibdev, qp );
  err_dev_create_qp:
@@ -274,7 +281,7 @@ struct ib_queue_pair * ib_create_qp ( struct ib_device *ibdev,
 	list_del ( &qp->list );
 	free ( qp );
  err_alloc_qp:
-	return NULL;
+	return rc;
 }
 
 /**
diff --git a/src/net/infiniband/ib_cmrc.c b/src/net/infiniband/ib_cmrc.c
index 2cd49018..b8f4bf36 100644
--- a/src/net/infiniband/ib_cmrc.c
+++ b/src/net/infiniband/ib_cmrc.c
@@ -423,23 +423,20 @@ int ib_cmrc_open ( struct interface *xfer, struct ib_device *ibdev,
 	}
 
 	/* Create completion queue */
-	cmrc->cq = ib_create_cq ( ibdev, IB_CMRC_NUM_CQES,
-				  &ib_cmrc_completion_ops );
-	if ( ! cmrc->cq ) {
-		DBGC ( cmrc, "CMRC %s %s could not create completion queue\n",
-		       ibdev->name, cmrc->name );
-		rc = -ENOMEM;
+	if ( ( rc = ib_create_cq ( ibdev, IB_CMRC_NUM_CQES,
+				   &ib_cmrc_completion_ops, &cmrc->cq ) ) != 0){
+		DBGC ( cmrc, "CMRC %s %s could not create completion queue: "
+		       "%s\n", ibdev->name, cmrc->name, strerror ( rc ) );
 		goto err_create_cq;
 	}
 
 	/* Create queue pair */
-	cmrc->qp = ib_create_qp ( ibdev, IB_QPT_RC, IB_CMRC_NUM_SEND_WQES,
-				  cmrc->cq, IB_CMRC_NUM_RECV_WQES, cmrc->cq,
-				  &ib_cmrc_queue_pair_ops, name );
-	if ( ! cmrc->qp ) {
-		DBGC ( cmrc, "CMRC %s %s could not create queue pair\n",
-		       ibdev->name, cmrc->name );
-		rc = -ENOMEM;
+	if ( ( rc = ib_create_qp ( ibdev, IB_QPT_RC, IB_CMRC_NUM_SEND_WQES,
+				   cmrc->cq, IB_CMRC_NUM_RECV_WQES, cmrc->cq,
+				   &ib_cmrc_queue_pair_ops, name,
+				   &cmrc->qp ) ) != 0 ) {
+		DBGC ( cmrc, "CMRC %s %s could not create queue pair: %s\n",
+		       ibdev->name, cmrc->name, strerror ( rc ) );
 		goto err_create_qp;
 	}
 	ib_qp_set_ownerdata ( cmrc->qp, cmrc );
diff --git a/src/net/infiniband/ib_mi.c b/src/net/infiniband/ib_mi.c
index 548a1c82..149c1e4d 100644
--- a/src/net/infiniband/ib_mi.c
+++ b/src/net/infiniband/ib_mi.c
@@ -357,19 +357,20 @@ struct ib_mad_interface * ib_create_mi ( struct ib_device *ibdev,
 	INIT_LIST_HEAD ( &mi->madx );
 
 	/* Create completion queue */
-	mi->cq = ib_create_cq ( ibdev, IB_MI_NUM_CQES, &ib_mi_completion_ops );
-	if ( ! mi->cq ) {
-		DBGC ( mi, "MI %p could not allocate completion queue\n", mi );
+	if ( ( rc = ib_create_cq ( ibdev, IB_MI_NUM_CQES, &ib_mi_completion_ops,
+				   &mi->cq ) ) != 0 ) {
+		DBGC ( mi, "MI %p could not create completion queue: %s\n",
+		       mi, strerror ( rc ) );
 		goto err_create_cq;
 	}
 
 	/* Create queue pair */
 	name = ( ( type == IB_QPT_SMI ) ? "SMI" : "GSI" );
-	mi->qp = ib_create_qp ( ibdev, type, IB_MI_NUM_SEND_WQES, mi->cq,
-				IB_MI_NUM_RECV_WQES, mi->cq,
-				&ib_mi_queue_pair_ops, name );
-	if ( ! mi->qp ) {
-		DBGC ( mi, "MI %p could not allocate queue pair\n", mi );
+	if ( ( rc = ib_create_qp ( ibdev, type, IB_MI_NUM_SEND_WQES, mi->cq,
+				   IB_MI_NUM_RECV_WQES, mi->cq,
+				   &ib_mi_queue_pair_ops, name, &mi->qp ) )!=0){
+		DBGC ( mi, "MI %p could not create queue pair: %s\n",
+		       mi, strerror ( rc ) );
 		goto err_create_qp;
 	}
 	ib_qp_set_ownerdata ( mi->qp, mi );