i40evf: add client interface

In preparation for upcoming RDMA-capable hardware, add a client
interface to the VF driver. This is a slightly-simplified version
of the PF client interface, with the names changed to protect the
innocent.

Due to the nature of the VF<->PF interactions, the client interface
sometimes needs to call back into itself to pass messages. Because
of this, we can't use the coarse-grained locking like the PF's
client interface uses. Instead, we handle all client interactions
in a separate thread so the watchdog can still run and process
virtual channel messages.

Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Avinash Dayanand <avinash.dayanand@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 78 insertions, 5 deletions

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
index f35dcaac5bb7..9492b20da557 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -26,6 +26,7 @@
 
 #include "i40evf.h"
 #include "i40e_prototype.h"
+#include "i40evf_client.h"
 static int i40evf_setup_all_tx_resources(struct i40evf_adapter *adapter);
 static int i40evf_setup_all_rx_resources(struct i40evf_adapter *adapter);
 static int i40evf_close(struct net_device *netdev);
@@ -1058,6 +1059,8 @@ static void i40evf_up_complete(struct i40evf_adapter *adapter)
 	i40evf_napi_enable_all(adapter);
 
 	adapter->aq_required |= I40EVF_FLAG_AQ_ENABLE_QUEUES;
+	if (CLIENT_ENABLED(adapter))
+		adapter->flags |= I40EVF_FLAG_CLIENT_NEEDS_OPEN;
 	mod_timer_pending(&adapter->watchdog_timer, jiffies + 1);
 }
 
@@ -1685,6 +1688,7 @@ static void i40evf_watchdog_task(struct work_struct *work)
 		i40evf_set_promiscuous(adapter, 0);
 		goto watchdog_done;
 	}
+	schedule_delayed_work(&adapter->client_task, msecs_to_jiffies(5));
 
 	if (adapter->state == __I40EVF_RUNNING)
 		i40evf_request_stats(adapter);
@@ -1773,10 +1777,17 @@ static void i40evf_reset_task(struct work_struct *work)
 	u32 reg_val;
 	int i = 0, err;
 
-	while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
+	while (test_and_set_bit(__I40EVF_IN_CLIENT_TASK,
 				&adapter->crit_section))
 		usleep_range(500, 1000);
-
+	if (CLIENT_ENABLED(adapter)) {
+		adapter->flags &= ~(I40EVF_FLAG_CLIENT_NEEDS_OPEN |
+				    I40EVF_FLAG_CLIENT_NEEDS_CLOSE |
+				    I40EVF_FLAG_CLIENT_NEEDS_L2_PARAMS |
+				    I40EVF_FLAG_SERVICE_CLIENT_REQUESTED);
+		cancel_delayed_work_sync(&adapter->client_task);
+		i40evf_notify_client_close(&adapter->vsi, true);
+	}
 	i40evf_misc_irq_disable(adapter);
 	if (adapter->flags & I40EVF_FLAG_RESET_NEEDED) {
 		adapter->flags &= ~I40EVF_FLAG_RESET_NEEDED;
@@ -1819,6 +1830,7 @@ static void i40evf_reset_task(struct work_struct *work)
 		dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",
 			reg_val);
 		i40evf_disable_vf(adapter);
+		clear_bit(__I40EVF_IN_CLIENT_TASK, &adapter->crit_section);
 		return; /* Do not attempt to reinit. It's dead, Jim. */
 	}
 
@@ -1861,9 +1873,8 @@ continue_reset:
 	}
 	adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
 	adapter->aq_required |= I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
-	/* Open RDMA Client again */
-	adapter->aq_required |= I40EVF_FLAG_SERVICE_CLIENT_REQUESTED;
 	clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
+	clear_bit(__I40EVF_IN_CLIENT_TASK, &adapter->crit_section);
 	i40evf_misc_irq_enable(adapter);
 
 	mod_timer(&adapter->watchdog_timer, jiffies + 2);
@@ -1980,6 +1991,48 @@ out:
 }
 
 /**
+ * i40evf_client_task - worker thread to perform client work
+ * @work: pointer to work_struct containing our data
+ *
+ * This task handles client interactions. Because client calls can be
+ * reentrant, we can't handle them in the watchdog.
+ **/
+static void i40evf_client_task(struct work_struct *work)
+{
+	struct i40evf_adapter *adapter =
+		container_of(work, struct i40evf_adapter, client_task.work);
+
+	/* If we can't get the client bit, just give up. We'll be rescheduled
+	 * later.
+	 */
+
+	if (test_and_set_bit(__I40EVF_IN_CLIENT_TASK, &adapter->crit_section))
+		return;
+
+	if (adapter->flags & I40EVF_FLAG_SERVICE_CLIENT_REQUESTED) {
+		i40evf_client_subtask(adapter);
+		adapter->flags &= ~I40EVF_FLAG_SERVICE_CLIENT_REQUESTED;
+		goto out;
+	}
+	if (adapter->flags & I40EVF_FLAG_CLIENT_NEEDS_CLOSE) {
+		i40evf_notify_client_close(&adapter->vsi, false);
+		adapter->flags &= ~I40EVF_FLAG_CLIENT_NEEDS_CLOSE;
+		goto out;
+	}
+	if (adapter->flags & I40EVF_FLAG_CLIENT_NEEDS_OPEN) {
+		i40evf_notify_client_open(&adapter->vsi);
+		adapter->flags &= ~I40EVF_FLAG_CLIENT_NEEDS_OPEN;
+		goto out;
+	}
+	if (adapter->flags & I40EVF_FLAG_CLIENT_NEEDS_L2_PARAMS) {
+		i40evf_notify_client_l2_params(&adapter->vsi);
+		adapter->flags &= ~I40EVF_FLAG_CLIENT_NEEDS_L2_PARAMS;
+	}
+out:
+	clear_bit(__I40EVF_IN_CLIENT_TASK, &adapter->crit_section);
+}
+
+/**
  * i40evf_free_all_tx_resources - Free Tx Resources for All Queues
  * @adapter: board private structure
  *
@@ -2148,6 +2201,8 @@ static int i40evf_close(struct net_device *netdev)
 
 
 	set_bit(__I40E_DOWN, &adapter->vsi.state);
+	if (CLIENT_ENABLED(adapter))
+		adapter->flags |= I40EVF_FLAG_CLIENT_NEEDS_CLOSE;
 
 	i40evf_down(adapter);
 	adapter->state = __I40EVF_DOWN_PENDING;
@@ -2188,6 +2243,10 @@ static int i40evf_change_mtu(struct net_device *netdev, int new_mtu)
 	struct i40evf_adapter *adapter = netdev_priv(netdev);
 
 	netdev->mtu = new_mtu;
+	if (CLIENT_ENABLED(adapter)) {
+		i40evf_notify_client_l2_params(&adapter->vsi);
+		adapter->flags |= I40EVF_FLAG_SERVICE_CLIENT_REQUESTED;
+	}
 	adapter->flags |= I40EVF_FLAG_RESET_NEEDED;
 	schedule_work(&adapter->reset_task);
 
@@ -2581,6 +2640,12 @@ static void i40evf_init_task(struct work_struct *work)
 	adapter->netdev_registered = true;
 
 	netif_tx_stop_all_queues(netdev);
+	if (CLIENT_ALLOWED(adapter)) {
+		err = i40evf_lan_add_device(adapter);
+		if (err)
+			dev_info(&pdev->dev, "Failed to add VF to client API service list: %d\n",
+				 err);
+	}
 
 	dev_info(&pdev->dev, "MAC address: %pM\n", adapter->hw.mac.addr);
 	if (netdev->features & NETIF_F_GRO)
@@ -2745,6 +2810,7 @@ static int i40evf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	INIT_WORK(&adapter->reset_task, i40evf_reset_task);
 	INIT_WORK(&adapter->adminq_task, i40evf_adminq_task);
 	INIT_WORK(&adapter->watchdog_task, i40evf_watchdog_task);
+	INIT_DELAYED_WORK(&adapter->client_task, i40evf_client_task);
 	INIT_DELAYED_WORK(&adapter->init_task, i40evf_init_task);
 	schedule_delayed_work(&adapter->init_task,
 			      msecs_to_jiffies(5 * (pdev->devfn & 0x07)));
@@ -2857,14 +2923,21 @@ static void i40evf_remove(struct pci_dev *pdev)
 	struct i40evf_adapter *adapter = netdev_priv(netdev);
 	struct i40evf_mac_filter *f, *ftmp;
 	struct i40e_hw *hw = &adapter->hw;
+	int err;
 
 	cancel_delayed_work_sync(&adapter->init_task);
 	cancel_work_sync(&adapter->reset_task);
-
+	cancel_delayed_work_sync(&adapter->client_task);
 	if (adapter->netdev_registered) {
 		unregister_netdev(netdev);
 		adapter->netdev_registered = false;
 	}
+	if (CLIENT_ALLOWED(adapter)) {
+		err = i40evf_lan_del_device(adapter);
+		if (err)
+			dev_warn(&pdev->dev, "Failed to delete client device: %d\n",
+				 err);
+	}
 
 	/* Shut down all the garbage mashers on the detention level */
 	adapter->state = __I40EVF_REMOVE;