Re: [RFC 02/11] Add RoCE driver framework

+
+MODULE_DESCRIPTION("QLogic 40G/100G ROCE Driver");
+MODULE_AUTHOR("QLogic Corporation");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_VERSION(QEDR_MODULE_VERSION);
+
+uint debug;
+module_param(debug, uint, 0);
+MODULE_PARM_DESC(debug, "Default debug msglevel");

+static LIST_HEAD(qedr_dev_list);
+static DEFINE_SPINLOCK(qedr_devlist_lock);
+

+void qedr_ib_dispatch_event(struct qedr_dev *dev, u8 port_num,
+			    enum ib_event_type type)
+{
+	struct ib_event ibev;
+
+	ibev.device = &dev->ibdev;
+	ibev.element.port_num = port_num;
+	ibev.event = type;
+
+	ib_dispatch_event(&ibev);
+}
+
+static enum rdma_link_layer qedr_link_layer(struct ib_device *device,
+					    u8 port_num)
+{
+	return IB_LINK_LAYER_ETHERNET;
+}
+
+static int qedr_register_device(struct qedr_dev *dev)
+{
+	strlcpy(dev->ibdev.name, "qedr%d", IB_DEVICE_NAME_MAX);
+
+	memcpy(dev->ibdev.node_desc, QEDR_NODE_DESC, sizeof(QEDR_NODE_DESC));
+	dev->ibdev.owner = THIS_MODULE;
+
+	dev->ibdev.get_link_layer = qedr_link_layer;
+
+	return 0;
+}
+
+/* QEDR sysfs interface */
+static ssize_t show_rev(struct device *device, struct device_attribute *attr,
+			char *buf)
+{
+	struct qedr_dev *dev = dev_get_drvdata(device);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%x\n", dev->pdev->vendor);
+}
+
+static ssize_t show_fw_ver(struct device *device, struct device_attribute *attr,
+			   char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%s\n", "FW_VER_TO_ADD");
+}

+static ssize_t show_hca_type(struct device *device,
+			     struct device_attribute *attr, char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE, "%s\n", "HCA_TYPE_TO_SET");
+}
+
+static DEVICE_ATTR(hw_rev, S_IRUGO, show_rev, NULL);
+static DEVICE_ATTR(fw_ver, S_IRUGO, show_fw_ver, NULL);
+static DEVICE_ATTR(hca_type, S_IRUGO, show_hca_type, NULL);
+
+static struct device_attribute *qedr_attributes[] = {
+	&dev_attr_hw_rev,
+	&dev_attr_fw_ver,
+	&dev_attr_hca_type
+};
+
+static void qedr_remove_sysfiles(struct qedr_dev *dev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(qedr_attributes); i++)
+		device_remove_file(&dev->ibdev.dev, qedr_attributes[i]);
+}
+
+void qedr_config_debug(uint debug, u32 *p_dp_module, u8 *p_dp_level)
+{
+	*p_dp_level = 0;
+	*p_dp_module = 0;
+
+	if (debug & QED_LOG_VERBOSE_MASK) {
+		*p_dp_level = QED_LEVEL_VERBOSE;
+		*p_dp_module = (debug & 0x3FFFFFFF);
+	} else if (debug & QED_LOG_INFO_MASK) {
+		*p_dp_level = QED_LEVEL_INFO;
+	} else if (debug & QED_LOG_NOTICE_MASK) {
+		*p_dp_level = QED_LEVEL_NOTICE;
+	}
+}
+
+static void qedr_pci_set_atomic(struct qedr_dev *dev, struct pci_dev *pdev)
+{
+	struct pci_dev *bridge;
+	u32 val;
+
+	dev->atomic_cap = IB_ATOMIC_NONE;
+
+	bridge = pdev->bus->self;
+	if (!bridge)
+		return;
+
+	/* Check whether we are connected directly or via a switch */
+	while (bridge && bridge->bus->parent) {
+		DP_NOTICE(dev,
+			  "Device is not connected directly to root. bridge->bus->number=%d primary=%d\n",
+			  bridge->bus->number, bridge->bus->primary);
+		/* Need to check Atomic Op Routing Supported all the way to
+		 * root complex.
+		 */
+		pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &val);
+		if (!(val & PCI_EXP_DEVCAP2_ATOMIC_ROUTE)) {
+			pcie_capability_clear_word(pdev,
+						   PCI_EXP_DEVCTL2,
+						   PCI_EXP_DEVCTL2_ATOMIC_REQ);
+			return;
+		}
+		bridge = bridge->bus->parent->self;
+	}
+	bridge = pdev->bus->self;
+
+	/* according to bridge capability */
+	pcie_capability_read_dword(bridge, PCI_EXP_DEVCAP2, &val);
+	if (val & PCI_EXP_DEVCAP2_ATOMIC_COMP64) {
+		pcie_capability_set_word(pdev, PCI_EXP_DEVCTL2,
+					 PCI_EXP_DEVCTL2_ATOMIC_REQ);
+		dev->atomic_cap = IB_ATOMIC_GLOB;
+	} else {
+		pcie_capability_clear_word(pdev, PCI_EXP_DEVCTL2,
+					   PCI_EXP_DEVCTL2_ATOMIC_REQ);
+	}
+}
+
+static struct qedr_dev *qedr_add(struct qed_dev *cdev, struct pci_dev *pdev,
+				 struct net_device *ndev)
+{
+	struct qedr_dev *dev;
+	int rc = 0, i;
+
+	dev = (struct qedr_dev *)ib_alloc_device(sizeof(*dev));
+	if (!dev) {
+		pr_err("Unable to allocate ib device\n");
+		return NULL;
+	}
+
+	qedr_config_debug(debug, &dev->dp_module, &dev->dp_level);
+	DP_VERBOSE(dev, QEDR_MSG_INIT, "qedr add device called\n");
+
+	dev->pdev = pdev;
+	dev->ndev = ndev;
+	dev->cdev = cdev;
+
+	qedr_pci_set_atomic(dev, pdev);
+
+	rc = qedr_register_device(dev);
+	if (rc) {
+		DP_ERR(dev, "Unable to allocate register device\n");
+		goto init_err;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(qedr_attributes); i++)
+		if (device_create_file(&dev->ibdev.dev, qedr_attributes[i]))
+			goto init_err;
+
+	spin_lock(&qedr_devlist_lock);
+	list_add_tail_rcu(&dev->entry, &qedr_dev_list);
+	spin_unlock(&qedr_devlist_lock);
+
+	DP_VERBOSE(dev, QEDR_MSG_INIT, "qedr driver loaded successfully\n");
+	return dev;
+
+init_err:
+	ib_dealloc_device(&dev->ibdev);
+	DP_ERR(dev, "qedr driver load failed rc=%d\n", rc);
+
+	return NULL;
+}
+
+static void qedr_remove(struct qedr_dev *dev)
+{
+	/* First unregister with stack to stop all the active traffic
+	 * of the registered clients.
+	 */
+	qedr_remove_sysfiles(dev);
+
+	spin_lock(&qedr_devlist_lock);
+	list_del_rcu(&dev->entry);
+	spin_unlock(&qedr_devlist_lock);
+
+	ib_dealloc_device(&dev->ibdev);
+}
+
+static int qedr_close(struct qedr_dev *dev)
+{
+	qedr_ib_dispatch_event(dev, 1, IB_EVENT_PORT_ERR);
+