qlcnic: add interrupt diagnostic test

Interrupt test (offline) added in ethtool self test.
Register a temporary interrupt handler and then send command to fw
to raise an interrupt.

Signed-off-by: Sucheta Chakraborty <sucheta.chakraborty@qlogic.com>
Signed-off-by: Amit Kumar Salecha <amit.salecha@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 102 insertions, 10 deletions

diff --git a/drivers/net/qlcnic/qlcnic_main.c b/drivers/net/qlcnic/qlcnic_main.c
index 7259adc3263..a8b07120d36 100644
--- a/drivers/net/qlcnic/qlcnic_main.c
+++ b/drivers/net/qlcnic/qlcnic_main.c
@@ -88,6 +88,7 @@ static void qlcnic_remove_diag_entries(struct qlcnic_adapter *adapter);
 static void qlcnic_clr_all_drv_state(struct qlcnic_adapter *adapter);
 static int qlcnic_can_start_firmware(struct qlcnic_adapter *adapter);
 
+static irqreturn_t qlcnic_tmp_intr(int irq, void *data);
 static irqreturn_t qlcnic_intr(int irq, void *data);
 static irqreturn_t qlcnic_msi_intr(int irq, void *data);
 static irqreturn_t qlcnic_msix_intr(int irq, void *data);
@@ -720,13 +721,20 @@ qlcnic_request_irq(struct qlcnic_adapter *adapter)
 	struct net_device *netdev = adapter->netdev;
 	struct qlcnic_recv_context *recv_ctx = &adapter->recv_ctx;
 
-	if (adapter->flags & QLCNIC_MSIX_ENABLED)
-		handler = qlcnic_msix_intr;
-	else if (adapter->flags & QLCNIC_MSI_ENABLED)
-		handler = qlcnic_msi_intr;
-	else {
-		flags |= IRQF_SHARED;
-		handler = qlcnic_intr;
+	if (adapter->diag_test == QLCNIC_INTERRUPT_TEST) {
+		handler = qlcnic_tmp_intr;
+		if (!QLCNIC_IS_MSI_FAMILY(adapter))
+			flags |= IRQF_SHARED;
+
+	} else {
+		if (adapter->flags & QLCNIC_MSIX_ENABLED)
+			handler = qlcnic_msix_intr;
+		else if (adapter->flags & QLCNIC_MSI_ENABLED)
+			handler = qlcnic_msi_intr;
+		else {
+			flags |= IRQF_SHARED;
+			handler = qlcnic_intr;
+		}
 	}
 	adapter->irq = netdev->irq;
 
@@ -923,6 +931,60 @@ qlcnic_detach(struct qlcnic_adapter *adapter)
 	adapter->is_up = 0;
 }
 
+void qlcnic_diag_free_res(struct net_device *netdev, int max_sds_rings)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_host_sds_ring *sds_ring;
+	int ring;
+
+	for (ring = 0; ring < adapter->max_sds_rings; ring++) {
+		sds_ring = &adapter->recv_ctx.sds_rings[ring];
+		qlcnic_disable_int(sds_ring);
+	}
+
+	qlcnic_detach(adapter);
+
+	adapter->diag_test = 0;
+	adapter->max_sds_rings = max_sds_rings;
+
+	if (qlcnic_attach(adapter))
+		return;
+
+	if (netif_running(netdev))
+		__qlcnic_up(adapter, netdev);
+
+	netif_device_attach(netdev);
+}
+
+int qlcnic_diag_alloc_res(struct net_device *netdev, int test)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_host_sds_ring *sds_ring;
+	int ring;
+	int ret;
+
+	netif_device_detach(netdev);
+
+	if (netif_running(netdev))
+		__qlcnic_down(adapter, netdev);
+
+	qlcnic_detach(adapter);
+
+	adapter->max_sds_rings = 1;
+	adapter->diag_test = test;
+
+	ret = qlcnic_attach(adapter);
+	if (ret)
+		return ret;
+
+	for (ring = 0; ring < adapter->max_sds_rings; ring++) {
+		sds_ring = &adapter->recv_ctx.sds_rings[ring];
+		qlcnic_enable_int(sds_ring);
+	}
+
+	return 0;
+}
+
 int
 qlcnic_reset_context(struct qlcnic_adapter *adapter)
 {
@@ -1689,10 +1751,8 @@ static struct net_device_stats *qlcnic_get_stats(struct net_device *netdev)
 	return stats;
 }
 
-static irqreturn_t qlcnic_intr(int irq, void *data)
+static irqreturn_t qlcnic_clear_legacy_intr(struct qlcnic_adapter *adapter)
 {
-	struct qlcnic_host_sds_ring *sds_ring = data;
-	struct qlcnic_adapter *adapter = sds_ring->adapter;
 	u32 status;
 
 	status = readl(adapter->isr_int_vec);
@@ -1710,6 +1770,38 @@ static irqreturn_t qlcnic_intr(int irq, void *data)
 	readl(adapter->isr_int_vec);
 	readl(adapter->isr_int_vec);
 
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t qlcnic_tmp_intr(int irq, void *data)
+{
+	struct qlcnic_host_sds_ring *sds_ring = data;
+	struct qlcnic_adapter *adapter = sds_ring->adapter;
+
+	if (adapter->flags & QLCNIC_MSIX_ENABLED)
+		goto done;
+	else if (adapter->flags & QLCNIC_MSI_ENABLED) {
+		writel(0xffffffff, adapter->tgt_status_reg);
+		goto done;
+	}
+
+	if (qlcnic_clear_legacy_intr(adapter) == IRQ_NONE)
+		return IRQ_NONE;
+
+done:
+	adapter->diag_cnt++;
+	qlcnic_enable_int(sds_ring);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t qlcnic_intr(int irq, void *data)
+{
+	struct qlcnic_host_sds_ring *sds_ring = data;
+	struct qlcnic_adapter *adapter = sds_ring->adapter;
+
+	if (qlcnic_clear_legacy_intr(adapter) == IRQ_NONE)
+		return IRQ_NONE;
+
 	napi_schedule(&sds_ring->napi);
 
 	return IRQ_HANDLED;