RDMA/irdma: Add wait for suspend on SQD

Currently, there is no wait for the QP suspend to complete on a modify
to SQD state. Add a wait, after the modify to SQD state, for the Suspend
Complete AE. While we are at it, update the suspend timeout value in
irdma_prep_tc_change to use IRDMA_EVENT_TIMEOUT_MS too.

Fixes: b48c24c ("RDMA/irdma: Implement device supported verb APIs")
Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Link: https://lore.kernel.org/r/20231114170246.238-3-shiraz.saleem@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: mustafakismail

drivers/infiniband/hw/irdma/hw.c

@@ -321,7 +321,11 @@ static void irdma_process_aeq(struct irdma_pci_f *rf)
 			break;
 		case IRDMA_AE_QP_SUSPEND_COMPLETE:
 			if (iwqp->iwdev->vsi.tc_change_pending) {
-				atomic_dec(&iwqp->sc_qp.vsi->qp_suspend_reqs);
+				if (!atomic_dec_return(&qp->vsi->qp_suspend_reqs))
+					wake_up(&iwqp->iwdev->suspend_wq);
+			}
+			if (iwqp->suspend_pending) {
+				iwqp->suspend_pending = false;
 				wake_up(&iwqp->iwdev->suspend_wq);
 			}
 			break;

drivers/infiniband/hw/irdma/main.c

@@ -48,7 +48,7 @@ static void irdma_prep_tc_change(struct irdma_device *iwdev)
 	/* Wait for all qp's to suspend */
 	wait_event_timeout(iwdev->suspend_wq,
 			   !atomic_read(&iwdev->vsi.qp_suspend_reqs),
-			   IRDMA_EVENT_TIMEOUT);
+			   msecs_to_jiffies(IRDMA_EVENT_TIMEOUT_MS));
 	irdma_ws_reset(&iwdev->vsi);
 }
 

drivers/infiniband/hw/irdma/main.h

@@ -78,7 +78,7 @@ extern struct auxiliary_driver i40iw_auxiliary_drv;
 
 #define MAX_DPC_ITERATIONS	128
 
-#define IRDMA_EVENT_TIMEOUT		50000
+#define IRDMA_EVENT_TIMEOUT_MS		5000
 #define IRDMA_VCHNL_EVENT_TIMEOUT	100000
 #define IRDMA_RST_TIMEOUT_HZ		4
 

drivers/infiniband/hw/irdma/verbs.c

@@ -1157,6 +1157,21 @@ static u8 irdma_roce_get_vlan_prio(const struct ib_gid_attr *attr, u8 prio)
 	return prio;
 }
 
+static int irdma_wait_for_suspend(struct irdma_qp *iwqp)
+{
+	if (!wait_event_timeout(iwqp->iwdev->suspend_wq,
+				!iwqp->suspend_pending,
+				msecs_to_jiffies(IRDMA_EVENT_TIMEOUT_MS))) {
+		iwqp->suspend_pending = false;
+		ibdev_warn(&iwqp->iwdev->ibdev,
+			   "modify_qp timed out waiting for suspend. qp_id = %d, last_ae = 0x%x\n",
+			   iwqp->ibqp.qp_num, iwqp->last_aeq);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
 /**
  * irdma_modify_qp_roce - modify qp request
  * @ibqp: qp's pointer for modify
@@ -1420,6 +1435,7 @@ int irdma_modify_qp_roce(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 
 			info.next_iwarp_state = IRDMA_QP_STATE_SQD;
 			issue_modify_qp = 1;
+			iwqp->suspend_pending = true;
 			break;
 		case IB_QPS_SQE:
 		case IB_QPS_ERR:
@@ -1460,6 +1476,11 @@ int irdma_modify_qp_roce(struct ib_qp *ibqp, struct ib_qp_attr *attr,
 			ctx_info->rem_endpoint_idx = udp_info->arp_idx;
 			if (irdma_hw_modify_qp(iwdev, iwqp, &info, true))
 				return -EINVAL;
+			if (info.next_iwarp_state == IRDMA_QP_STATE_SQD) {
+				ret = irdma_wait_for_suspend(iwqp);
+				if (ret)
+					return ret;
+			}
 			spin_lock_irqsave(&iwqp->lock, flags);
 			if (iwqp->iwarp_state == info.curr_iwarp_state) {
 				iwqp->iwarp_state = info.next_iwarp_state;

drivers/infiniband/hw/irdma/verbs.h

@@ -198,6 +198,7 @@ struct irdma_qp {
 	u8 flush_issued : 1;
 	u8 sig_all : 1;
 	u8 pau_mode : 1;
+	u8 suspend_pending : 1;
 	u8 rsvd : 1;
 	u8 iwarp_state;
 	u16 term_sq_flush_code;