RDMA/qedr: Add iWARP connection management functions

Implements the iWARP connection management functions:
connect, accept, create listener and destroy listener

Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: Ram Amrani <Ram.Amrani@cavium.com>
Signed-off-by: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/qedr/main.c

@@ -145,6 +145,12 @@ int qedr_iw_register_device(struct qedr_dev *dev)
 	dev->ibdev.iwcm = kzalloc(sizeof(*dev->ibdev.iwcm), GFP_KERNEL);
 	if (!dev->ibdev.iwcm)
 		return -ENOMEM;
+
+	dev->ibdev.iwcm->connect = qedr_iw_connect;
+	dev->ibdev.iwcm->accept = qedr_iw_accept;
+	dev->ibdev.iwcm->reject = qedr_iw_reject;
+	dev->ibdev.iwcm->create_listen = qedr_iw_create_listen;
+	dev->ibdev.iwcm->destroy_listen = qedr_iw_destroy_listen;
 	dev->ibdev.iwcm->add_ref = qedr_iw_qp_add_ref;
 	dev->ibdev.iwcm->rem_ref = qedr_iw_qp_rem_ref;
 	dev->ibdev.iwcm->get_qp = qedr_iw_get_qp;
@@ -296,6 +302,9 @@ static void qedr_free_resources(struct qedr_dev *dev)
 {
 	int i;
 
+	if (IS_IWARP(dev))
+		destroy_workqueue(dev->iwarp_wq);
+
 	for (i = 0; i < dev->num_cnq; i++) {
 		qedr_free_mem_sb(dev, &dev->sb_array[i], dev->sb_start + i);
 		dev->ops->common->chain_free(dev->cdev, &dev->cnq_array[i].pbl);
@@ -323,6 +332,7 @@ static int qedr_alloc_resources(struct qedr_dev *dev)
 	if (IS_IWARP(dev)) {
 		spin_lock_init(&dev->idr_lock);
 		idr_init(&dev->qpidr);
+		dev->iwarp_wq = create_singlethread_workqueue("qedr_iwarpq");
 	}
 
 	/* Allocate Status blocks for CNQ */
@@ -800,6 +810,7 @@ static int qedr_init_hw(struct qedr_dev *dev)
 	in_params->events = &events;
 	in_params->cq_mode = QED_RDMA_CQ_MODE_32_BITS;
 	in_params->max_mtu = dev->ndev->mtu;
+	dev->iwarp_max_mtu = dev->ndev->mtu;
 	ether_addr_copy(&in_params->mac_addr[0], dev->ndev->dev_addr);
 
 	rc = dev->ops->rdma_init(dev->cdev, in_params);

drivers/infiniband/hw/qedr/qedr.h

@@ -60,6 +60,7 @@
 #define QEDR_MSG_SQ   "  SQ"
 #define QEDR_MSG_QP   "  QP"
 #define QEDR_MSG_GSI  " GSI"
+#define QEDR_MSG_IWARP  " IW"
 
 #define QEDR_CQ_MAGIC_NUMBER	(0x11223344)
 
@@ -167,6 +168,9 @@ struct qedr_dev {
 	enum qed_rdma_type	rdma_type;
 	spinlock_t		idr_lock; /* Protect qpidr data-structure */
 	struct idr		qpidr;
+	struct workqueue_struct *iwarp_wq;
+	u16			iwarp_max_mtu;
+
 	unsigned long enet_state;
 };
 
@@ -344,7 +348,7 @@ enum qedr_qp_err_bitmap {
 struct qedr_qp {
 	struct ib_qp ibqp;	/* must be first */
 	struct qedr_dev *dev;
-
+	struct qedr_iw_ep *ep;
 	struct qedr_qp_hwq_info sq;
 	struct qedr_qp_hwq_info rq;
 
@@ -402,6 +406,7 @@ struct qedr_qp {
 	struct qedr_userq usq;
 	struct qedr_userq urq;
 	atomic_t refcnt;
+	bool destroyed;
 };
 
 struct qedr_ah {
@@ -482,6 +487,21 @@ static inline int qedr_get_dmac(struct qedr_dev *dev,
 	return 0;
 }
 
+struct qedr_iw_listener {
+	struct qedr_dev *dev;
+	struct iw_cm_id *cm_id;
+	int		backlog;
+	void		*qed_handle;
+};
+
+struct qedr_iw_ep {
+	struct qedr_dev	*dev;
+	struct iw_cm_id	*cm_id;
+	struct qedr_qp	*qp;
+	void		*qed_context;
+	u8		during_connect;
+};
+
 static inline
 struct qedr_ucontext *get_qedr_ucontext(struct ib_ucontext *ibucontext)
 {

drivers/infiniband/hw/qedr/qedr_iw_cm.h

@@ -30,6 +30,18 @@
  * SOFTWARE.
  */
 #include <rdma/iw_cm.h>
+
+int qedr_iw_connect(struct iw_cm_id *cm_id,
+		    struct iw_cm_conn_param *conn_param);
+
+int qedr_iw_create_listen(struct iw_cm_id *cm_id, int backlog);
+
+int qedr_iw_destroy_listen(struct iw_cm_id *cm_id);
+
+int qedr_iw_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param);
+
+int qedr_iw_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len);
+
 void qedr_iw_qp_add_ref(struct ib_qp *qp);
 
 void qedr_iw_qp_rem_ref(struct ib_qp *qp);

drivers/infiniband/hw/qedr/verbs.c

@@ -2257,6 +2257,23 @@ int qedr_destroy_qp(struct ib_qp *ibqp)
 			/* Change the QP state to ERROR */
 			qedr_modify_qp(ibqp, &attr, attr_mask, NULL);
 		}
+	} else {
+		/* Wait for the connect/accept to complete */
+		if (qp->ep) {
+			int wait_count = 1;
+
+			while (qp->ep->during_connect) {
+				DP_DEBUG(dev, QEDR_MSG_QP,
+					 "Still in during connect/accept\n");
+
+				msleep(100);
+				if (wait_count++ > 200) {
+					DP_NOTICE(dev,
+						  "during connect timeout\n");
+					break;
+				}
+			}
+		}
 	}
 
 	if (qp->qp_type == IB_QPT_GSI)