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[Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify


From: Lan Tianyu
Subject: [Qemu-devel] [RFC Patch 05/12] IXGBE: Add new sysfs interface of "notify_vf"
Date: Thu, 22 Oct 2015 00:37:37 +0800

This patch is to add new sysfs interface of "notify_vf" under sysfs
directory of VF PCI device for Qemu to notify VF when migration status
is changed.

Signed-off-by: Lan Tianyu <address@hidden>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 30 ++++++++++++++++++++++++++
 drivers/net/ethernet/intel/ixgbe/ixgbe_type.h  |  4 ++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
index e247d67..5cc7817 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
@@ -217,10 +217,37 @@ static ssize_t ixgbe_store_state_in_pf(struct device *dev,
        return count;
 }
 
+static ssize_t ixgbe_store_notify_vf(struct device *dev,
+                                      struct device_attribute *attr,
+                                      const char *buf, size_t count)
+{
+       struct ixgbe_adapter *adapter = to_adapter(dev);
+       struct ixgbe_hw *hw = &adapter->hw;
+       struct pci_dev *vf_pdev = to_pci_dev(dev);
+       int vfn = vf_pdev->virtfn_index;
+       u32 ivar;
+
+       /* Enable VF mailbox irq first */
+       IXGBE_WRITE_REG(hw, IXGBE_PVTEIMS(vfn), 0x4);
+       IXGBE_WRITE_REG(hw, IXGBE_PVTEIAM(vfn), 0x4);
+       IXGBE_WRITE_REG(hw, IXGBE_PVTEIAC(vfn), 0x4);
+
+       ivar = IXGBE_READ_REG(hw, IXGBE_PVTIVAR_MISC(vfn));
+       ivar &= ~0xFF;
+       ivar |= 0x2 | IXGBE_IVAR_ALLOC_VAL;
+       IXGBE_WRITE_REG(hw, IXGBE_PVTIVAR_MISC(vfn), ivar);
+
+       ixgbe_ping_vf(adapter, vfn);
+       return count;
+}
+
 static struct device_attribute ixgbe_per_state_in_pf_attribute =
        __ATTR(state_in_pf, S_IRUGO | S_IWUSR,
                ixgbe_show_state_in_pf, ixgbe_store_state_in_pf);
 
+static struct device_attribute ixgbe_per_notify_vf_attribute =
+       __ATTR(notify_vf, S_IWUSR, NULL, ixgbe_store_notify_vf);
+
 void ixgbe_add_vf_attrib(struct ixgbe_adapter *adapter)
 {
        struct pci_dev *pdev = adapter->pdev;
@@ -241,6 +268,8 @@ void ixgbe_add_vf_attrib(struct ixgbe_adapter *adapter)
                if (vfdev->is_virtfn) {
                        ret = device_create_file(&vfdev->dev,
                                        &ixgbe_per_state_in_pf_attribute);
+                       ret |= device_create_file(&vfdev->dev,
+                                       &ixgbe_per_notify_vf_attribute);
                        if (ret)
                                pr_warn("Unable to add VF attribute for dev 
%s,\n",
                                        dev_name(&vfdev->dev));
@@ -269,6 +298,7 @@ void ixgbe_remove_vf_attrib(struct ixgbe_adapter *adapter)
        while (vfdev) {
                if (vfdev->is_virtfn) {
                        device_remove_file(&vfdev->dev, 
&ixgbe_per_state_in_pf_attribute);
+                       device_remove_file(&vfdev->dev, 
&ixgbe_per_notify_vf_attribute);
                }
 
                vfdev = pci_get_device(pdev->vendor, vf_id, vfdev);
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h 
b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
index dd6ba59..c6ddb66 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_type.h
@@ -2302,6 +2302,10 @@ enum {
 #define IXGBE_PVFTDT(P)                (0x06018 + (0x40 * (P)))
 #define IXGBE_PVFTDWBAL(P)     (0x06038 + (0x40 * (P)))
 #define IXGBE_PVFTDWBAH(P)     (0x0603C + (0x40 * (P)))
+#define IXGBE_PVTEIMS(P)       (0x00D00 + (4 * (P)))
+#define IXGBE_PVTIVAR_MISC(P)  (0x04E00 + (4 * (P)))
+#define IXGBE_PVTEIAC(P)       (0x00F00 + (4 * P))
+#define IXGBE_PVTEIAM(P)       (0x04D00 + (4 * P))
 
 #define IXGBE_PVFTDWBALn(q_per_pool, vf_number, vf_q_index) \
                (IXGBE_PVFTDWBAL((q_per_pool)*(vf_number) + (vf_q_index)))
-- 
1.8.4.rc0.1.g8f6a3e5.dirty




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