netdev - [PATCH v3 5/7] qedf: Add schedule recovery handler.

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Date:   Fri, 3 Apr 2020 05:09:55 -0700
From:   Saurav Kashyap <skashyap@...vell.com>
To:     <martin.petersen@...cle.com>
CC:     <GR-QLogic-Storage-Upstream@...vell.com>,
        <linux-scsi@...r.kernel.org>, <jhasan@...vell.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH v3 5/7] qedf: Add schedule recovery handler.

From: Chad Dupuis <cdupuis@...vell.com>

- Add recovery handler, this will be triggered
  by QED.

Signed-off-by: Chad Dupuis <cdupuis@...vell.com>
Signed-off-by: Saurav Kashyap <skashyap@...vell.com>
---
Changes in v2
 - qedf_schedule_recovery_handler marked as static
 - qedf_recovery_handler marked as static

 drivers/scsi/qedf/qedf.h      |  1 +
 drivers/scsi/qedf/qedf_main.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/scsi/qedf/qedf.h b/drivers/scsi/qedf/qedf.h
index aaa2ac9..f8a98e5 100644
--- a/drivers/scsi/qedf/qedf.h
+++ b/drivers/scsi/qedf/qedf.h
@@ -387,6 +387,7 @@ struct qedf_ctx {
 #define QEDF_IO_WORK_MIN		64
 	mempool_t *io_mempool;
 	struct workqueue_struct *dpc_wq;
+	struct delayed_work recovery_work;
 	struct delayed_work grcdump_work;
 	struct delayed_work stag_work;
 
diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index ba66216..39a66e4 100644
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -28,6 +28,8 @@
 static int qedf_probe(struct pci_dev *pdev, const struct pci_device_id *id);
 static void qedf_remove(struct pci_dev *pdev);
 static void qedf_shutdown(struct pci_dev *pdev);
+static void qedf_schedule_recovery_handler(void *dev);
+static void qedf_recovery_handler(struct work_struct *work);
 
 /*
  * Driver module parameters.
@@ -662,6 +664,7 @@ static u32 qedf_get_login_failures(void *cookie)
 	{
 		.link_update = qedf_link_update,
 		.bw_update = qedf_bw_update,
+		.schedule_recovery_handler = qedf_schedule_recovery_handler,
 		.dcbx_aen = qedf_dcbx_handler,
 		.get_generic_tlv_data = qedf_get_generic_tlv_data,
 		.get_protocol_tlv_data = qedf_get_protocol_tlv_data,
@@ -3510,6 +3513,7 @@ static int __qedf_probe(struct pci_dev *pdev, int mode)
 		    qedf->lport->host->host_no);
 		qedf->dpc_wq = create_workqueue(host_buf);
 	}
+	INIT_DELAYED_WORK(&qedf->recovery_work, qedf_recovery_handler);
 
 	/*
 	 * GRC dump and sysfs parameters are not reaped during the recovery
@@ -3825,6 +3829,45 @@ static void qedf_shutdown(struct pci_dev *pdev)
 	__qedf_remove(pdev, QEDF_MODE_NORMAL);
 }
 
+/*
+ * Recovery handler code
+ */
+static void qedf_schedule_recovery_handler(void *dev)
+{
+	struct qedf_ctx *qedf = dev;
+
+	QEDF_ERR(&qedf->dbg_ctx, "Recovery handler scheduled.\n");
+	schedule_delayed_work(&qedf->recovery_work, 0);
+}
+
+static void qedf_recovery_handler(struct work_struct *work)
+{
+	struct qedf_ctx *qedf =
+	    container_of(work, struct qedf_ctx, recovery_work.work);
+
+	if (test_and_set_bit(QEDF_IN_RECOVERY, &qedf->flags))
+		return;
+
+	/*
+	 * Call common_ops->recovery_prolog to allow the MFW to quiesce
+	 * any PCI transactions.
+	 */
+	qed_ops->common->recovery_prolog(qedf->cdev);
+
+	QEDF_ERR(&qedf->dbg_ctx, "Recovery work start.\n");
+	__qedf_remove(qedf->pdev, QEDF_MODE_RECOVERY);
+	/*
+	 * Reset link and dcbx to down state since we will not get a link down
+	 * event from the MFW but calling __qedf_remove will essentially be a
+	 * link down event.
+	 */
+	atomic_set(&qedf->link_state, QEDF_LINK_DOWN);
+	atomic_set(&qedf->dcbx, QEDF_DCBX_PENDING);
+	__qedf_probe(qedf->pdev, QEDF_MODE_RECOVERY);
+	clear_bit(QEDF_IN_RECOVERY, &qedf->flags);
+	QEDF_ERR(&qedf->dbg_ctx, "Recovery work complete.\n");
+}
+
 /* Generic TLV data callback */
 void qedf_get_generic_tlv_data(void *dev, struct qed_generic_tlvs *data)
 {
-- 
1.8.3.1