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>

4 files changed, 154 insertions, 16 deletions

diff --git a/drivers/net/qlcnic/qlcnic.h b/drivers/net/qlcnic/qlcnic.h
index 514e805f3ab3..a5a67e9b5e10 100644
--- a/drivers/net/qlcnic/qlcnic.h
+++ b/drivers/net/qlcnic/qlcnic.h
@@ -560,6 +560,8 @@ struct qlcnic_recv_context {
 /*
  * Context state
  */
+#define QLCHAL_VERSION  1
+
 #define QLCNIC_HOST_CTX_STATE_ACTIVE    2
 
 /*
@@ -894,6 +896,8 @@ struct qlcnic_mac_req {
 #define __QLCNIC_RESETTING              2
 #define __QLCNIC_START_FW               4
 
+#define QLCNIC_INTERRUPT_TEST           1
+
 struct qlcnic_adapter {
         struct qlcnic_hardware_context ahw;
 
@@ -946,9 +950,10 @@ struct qlcnic_adapter {
         u32 heartbit;
 
         u8 dev_state;
+        u8 diag_test;
+        u8 diag_cnt;
         u8 rsrd1;
-        u32 rsrd2;
-
+        u16 rsrd2;
 
         u8 mac_addr[ETH_ALEN];
 
@@ -1064,6 +1069,10 @@ int qlcnic_get_mac_addr(struct qlcnic_adapter *adapter, u64 *mac);
 
 /* Functions from qlcnic_main.c */
 int qlcnic_reset_context(struct qlcnic_adapter *);
+u32 qlcnic_issue_cmd(struct qlcnic_adapter *adapter,
+        u32 pci_fn, u32 version, u32 arg1, u32 arg2, u32 arg3, u32 cmd);
+void qlcnic_diag_free_res(struct net_device *netdev, int max_sds_rings);
+int qlcnic_diag_alloc_res(struct net_device *netdev, int test);
 
 /*
  * QLOGIC Board information
diff --git a/drivers/net/qlcnic/qlcnic_ctx.c b/drivers/net/qlcnic/qlcnic_ctx.c
index 71c16a183458..0a6a39914aec 100644
--- a/drivers/net/qlcnic/qlcnic_ctx.c
+++ b/drivers/net/qlcnic/qlcnic_ctx.c
@@ -24,8 +24,6 @@
 
 #include "qlcnic.h"
 
-#define QLCHAL_VERSION  1
-
 static u32
 qlcnic_poll_rsp(struct qlcnic_adapter *adapter)
 {
@@ -45,7 +43,7 @@ qlcnic_poll_rsp(struct qlcnic_adapter *adapter)
         return rsp;
 }
 
-static u32
+u32
 qlcnic_issue_cmd(struct qlcnic_adapter *adapter,
         u32 pci_fn, u32 version, u32 arg1, u32 arg2, u32 arg3, u32 cmd)
 {
diff --git a/drivers/net/qlcnic/qlcnic_ethtool.c b/drivers/net/qlcnic/qlcnic_ethtool.c
index 7212319760ba..58c50ed791de 100644
--- a/drivers/net/qlcnic/qlcnic_ethtool.c
+++ b/drivers/net/qlcnic/qlcnic_ethtool.c
@@ -65,7 +65,8 @@ static const struct qlcnic_stats qlcnic_gstrings_stats[] = {
 
 static const char qlcnic_gstrings_test[][ETH_GSTRING_LEN] = {
         "Register_Test_on_offline",
-        "Link_Test_on_offline"
+        "Link_Test_on_offline",
+        "Interrupt_Test_offline"
 };
 
 #define QLCNIC_TEST_LEN ARRAY_SIZE(qlcnic_gstrings_test)
@@ -613,12 +614,50 @@ static int qlcnic_get_sset_count(struct net_device *dev, int sset)
         }
 }
 
+static int qlcnic_irq_test(struct net_device *netdev)
+{
+        struct qlcnic_adapter *adapter = netdev_priv(netdev);
+        int max_sds_rings = adapter->max_sds_rings;
+        int ret;
+
+        if (test_and_set_bit(__QLCNIC_RESETTING, &adapter->state))
+                return -EIO;
+
+        ret = qlcnic_diag_alloc_res(netdev, QLCNIC_INTERRUPT_TEST);
+        if (ret)
+                goto clear_it;
+
+        adapter->diag_cnt = 0;
+        ret = qlcnic_issue_cmd(adapter, adapter->ahw.pci_func,
+                        QLCHAL_VERSION, adapter->portnum, 0, 0, 0x00000011);
+        if (ret)
+                goto done;
+
+        msleep(10);
+
+        ret = !adapter->diag_cnt;
+
+done:
+        qlcnic_diag_free_res(netdev, max_sds_rings);
+
+clear_it:
+        adapter->max_sds_rings = max_sds_rings;
+        clear_bit(__QLCNIC_RESETTING, &adapter->state);
+        return ret;
+}
+
 static void
 qlcnic_diag_test(struct net_device *dev, struct ethtool_test *eth_test,
                      u64 *data)
 {
         memset(data, 0, sizeof(u64) * QLCNIC_TEST_LEN);
 
+        if (eth_test->flags == ETH_TEST_FL_OFFLINE) {
+                data[2] = qlcnic_irq_test(dev);
+                if (data[2])
+                        eth_test->flags |= ETH_TEST_FL_FAILED;
+        }
+
         data[0] = qlcnic_reg_test(dev);
         if (data[0])
                 eth_test->flags |= ETH_TEST_FL_FAILED;
diff --git a/drivers/net/qlcnic/qlcnic_main.c b/drivers/net/qlcnic/qlcnic_main.c
index 7259adc32631..a8b07120d362 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;