pci: access to specific bits via sysfs

[dpdk.git] / lib / librte_eal / linuxapp / igb_uio / igb_uio.c

diff --git a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
index 60b8ca4..1bd95f5 100644 (file)
--- a/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
+++ b/lib/librte_eal/linuxapp/igb_uio/igb_uio.c
@@ -48,6 +48,15 @@
 #define PCI_MSIX_ENTRY_CTRL_MASKBIT     1
 #endif
 
+#ifdef RTE_PCI_CONFIG
+#define PCI_SYS_FILE_BUF_SIZE      10
+#define PCI_DEV_CAP_REG            0xA4
+#define PCI_DEV_CTRL_REG           0xA8
+#define PCI_DEV_CAP_EXT_TAG_MASK   0x20
+#define PCI_DEV_CTRL_EXT_TAG_SHIFT 8
+#define PCI_DEV_CTRL_EXT_TAG_MASK  (1 << PCI_DEV_CTRL_EXT_TAG_SHIFT)
+#endif
+
 #define IGBUIO_NUM_MSI_VECTORS 1
 
 /**
@@ -123,9 +132,105 @@ store_max_vfs(struct device *dev, struct device_attribute *attr,
        return err ? err : count;
 }
 
+#ifdef RTE_PCI_CONFIG
+static ssize_t
+show_extended_tag(struct device *dev, struct device_attribute *attr, char *buf)
+{
+       struct pci_dev *pci_dev = container_of(dev, struct pci_dev, dev);
+       uint32_t val = 0;
+
+       pci_read_config_dword(pci_dev, PCI_DEV_CAP_REG, &val);
+       if (!(val & PCI_DEV_CAP_EXT_TAG_MASK)) /* Not supported */
+               return snprintf(buf, PCI_SYS_FILE_BUF_SIZE, "%s\n", "invalid");
+
+       val = 0;
+       pci_bus_read_config_dword(pci_dev->bus, pci_dev->devfn,
+                                       PCI_DEV_CTRL_REG, &val);
+
+       return snprintf(buf, PCI_SYS_FILE_BUF_SIZE, "%s\n",
+               (val & PCI_DEV_CTRL_EXT_TAG_MASK) ? "on" : "off");
+}
+
+static ssize_t
+store_extended_tag(struct device *dev,
+                  struct device_attribute *attr,
+                  const char *buf,
+                  size_t count)
+{
+       struct pci_dev *pci_dev = container_of(dev, struct pci_dev, dev);
+       uint32_t val = 0, enable;
+
+       if (strncmp(buf, "on", 2) == 0)
+               enable = 1;
+       else if (strncmp(buf, "off", 3) == 0)
+               enable = 0;
+       else
+               return -EINVAL;
+
+       pci_bus_read_config_dword(pci_dev->bus, pci_dev->devfn,
+                                       PCI_DEV_CAP_REG, &val);
+       if (!(val & PCI_DEV_CAP_EXT_TAG_MASK)) /* Not supported */
+               return -EPERM;
+
+       val = 0;
+       pci_bus_read_config_dword(pci_dev->bus, pci_dev->devfn,
+                                       PCI_DEV_CTRL_REG, &val);
+       if (enable)
+               val |= PCI_DEV_CTRL_EXT_TAG_MASK;
+       else
+               val &= ~PCI_DEV_CTRL_EXT_TAG_MASK;
+       pci_bus_write_config_dword(pci_dev->bus, pci_dev->devfn,
+                                       PCI_DEV_CTRL_REG, val);
+
+       return count;
+}
+
+static ssize_t
+show_max_read_request_size(struct device *dev,
+                          struct device_attribute *attr,
+                          char *buf)
+{
+       struct pci_dev *pci_dev = container_of(dev, struct pci_dev, dev);
+       int val = pcie_get_readrq(pci_dev);
+
+       return snprintf(buf, PCI_SYS_FILE_BUF_SIZE, "%d\n", val);
+}
+
+static ssize_t
+store_max_read_request_size(struct device *dev,
+                           struct device_attribute *attr,
+                           const char *buf,
+                           size_t count)
+{
+       struct pci_dev *pci_dev = container_of(dev, struct pci_dev, dev);
+       unsigned long size = 0;
+       int ret;
+
+       if (strict_strtoul(buf, 0, &size) != 0)
+               return -EINVAL;
+
+       ret = pcie_set_readrq(pci_dev, (int)size);
+       if (ret < 0)
+               return ret;
+
+       return count;
+}
+#endif
+
 static DEVICE_ATTR(max_vfs, S_IRUGO | S_IWUSR, show_max_vfs, store_max_vfs);
+#ifdef RTE_PCI_CONFIG
+static DEVICE_ATTR(extended_tag, S_IRUGO | S_IWUSR, show_extended_tag, \
+       store_extended_tag);
+static DEVICE_ATTR(max_read_request_size, S_IRUGO | S_IWUSR, \
+       show_max_read_request_size, store_max_read_request_size);
+#endif
+
 static struct attribute *dev_attrs[] = {
        &dev_attr_max_vfs.attr,
+#ifdef RTE_PCI_CONFIG
+       &dev_attr_extended_tag.attr,
+       &dev_attr_max_read_request_size.attr,
+#endif
         NULL,
 };