Merge branch 'hns3-VF-reset'

Salil Mehta says:

====================
Add support of VF Reset to HNS3 VF driver

This patch-set adds the support of VF reset to the existing VF driver.
VF Reset can be triggered due to TX watchdog firing  as a result of TX
data-path not working. VF reset could also be a result of some internal
configuration changes if that requires reset, or as a result of the
PF/Core/Global/IMP(Integrated Management Processor) reset happened in
the PF.

Summary of Patches:
* Watchdog timer trigger chnages are present in Patch 1.
* Reset Service Task and related Event handling is present in Patches {2,3}
* Changes to send reset request to PF, reset stack and re-initialization
  of the hclge device is present in Patches {4,5,6}
* Changes related to ARQ (Asynchronous Receive Queue) and its event handling
  are present in Patches {7,8}
* Changes required in PF to handle the VF Reset request and actually perform
  hardware VF reset is there in Patch 9.

NOTE: This patch depends upon "[PATCH net-next 00/11] fix some bugs for HNS3 driver"
	Link: https://lkml.org/lkml/2018/3/21/72
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hclge_mbx.h

@@ -11,6 +11,7 @@
 
 enum HCLGE_MBX_OPCODE {
 	HCLGE_MBX_RESET = 0x01,		/* (VF -> PF) assert reset */
+	HCLGE_MBX_ASSERTING_RESET,	/* (PF -> VF) PF is asserting reset*/
 	HCLGE_MBX_SET_UNICAST,		/* (VF -> PF) set UC addr */
 	HCLGE_MBX_SET_MULTICAST,	/* (VF -> PF) set MC addr */
 	HCLGE_MBX_SET_VLAN,		/* (VF -> PF) set VLAN */
@@ -85,6 +86,21 @@ struct hclge_mbx_pf_to_vf_cmd {
 	u16 msg[8];
 };
 
+/* used by VF to store the received Async responses from PF */
+struct hclgevf_mbx_arq_ring {
+#define HCLGE_MBX_MAX_ARQ_MSG_SIZE	8
+#define HCLGE_MBX_MAX_ARQ_MSG_NUM	1024
+	struct hclgevf_dev *hdev;
+	u32 head;
+	u32 tail;
+	u32 count;
+	u16 msg_q[HCLGE_MBX_MAX_ARQ_MSG_NUM][HCLGE_MBX_MAX_ARQ_MSG_SIZE];
+};
+
 #define hclge_mbx_ring_ptr_move_crq(crq) \
 	(crq->next_to_use = (crq->next_to_use + 1) % crq->desc_num)
+#define hclge_mbx_tail_ptr_move_arq(arq) \
+	(arq.tail = (arq.tail + 1) % HCLGE_MBX_MAX_ARQ_MSG_SIZE)
+#define hclge_mbx_head_ptr_move_arq(arq) \
+		(arq.head = (arq.head + 1) % HCLGE_MBX_MAX_ARQ_MSG_SIZE)
 #endif

drivers/net/ethernet/hisilicon/hns3/hnae3.h

@@ -118,6 +118,8 @@ enum hnae3_reset_notify_type {
 };
 
 enum hnae3_reset_type {
+	HNAE3_VF_RESET,
+	HNAE3_VF_FULL_RESET,
 	HNAE3_FUNC_RESET,
 	HNAE3_CORE_RESET,
 	HNAE3_GLOBAL_RESET,
@@ -400,8 +402,7 @@ struct hnae3_ae_ops {
 	int (*set_vf_vlan_filter)(struct hnae3_handle *handle, int vfid,
 				  u16 vlan, u8 qos, __be16 proto);
 	int (*enable_hw_strip_rxvtag)(struct hnae3_handle *handle, bool enable);
-	void (*reset_event)(struct hnae3_handle *handle,
-			    enum hnae3_reset_type reset);
+	void (*reset_event)(struct hnae3_handle *handle);
 	void (*get_channels)(struct hnae3_handle *handle,
 			     struct ethtool_channels *ch);
 	void (*get_tqps_and_rss_info)(struct hnae3_handle *h,
@@ -495,6 +496,9 @@ struct hnae3_handle {
 	struct hnae3_ae_algo *ae_algo;  /* the class who provides this handle */
 	u64 flags; /* Indicate the capabilities for this handle*/
 
+	unsigned long last_reset_time;
+	enum hnae3_reset_type reset_level;
+
 	union {
 		struct net_device *netdev; /* first member */
 		struct hnae3_knic_private_info kinfo;

drivers/net/ethernet/hisilicon/hns3/hns3_enet.c

@@ -320,7 +320,7 @@ static int hns3_nic_net_open(struct net_device *netdev)
 		return ret;
 	}
 
-	priv->last_reset_time = jiffies;
+	priv->ae_handle->last_reset_time = jiffies;
 	return 0;
 }
 
@@ -1543,32 +1543,19 @@ static bool hns3_get_tx_timeo_queue_info(struct net_device *ndev)
 static void hns3_nic_net_timeout(struct net_device *ndev)
 {
 	struct hns3_nic_priv *priv = netdev_priv(ndev);
-	unsigned long last_reset_time = priv->last_reset_time;
 	struct hnae3_handle *h = priv->ae_handle;
 
 	if (!hns3_get_tx_timeo_queue_info(ndev))
 		return;
 
 	priv->tx_timeout_count++;
 
-	/* This timeout is far away enough from last timeout,
-	 * if timeout again,set the reset type to PF reset
-	 */
-	if (time_after(jiffies, (last_reset_time + 20 * HZ)))
-		priv->reset_level = HNAE3_FUNC_RESET;
-
-	/* Don't do any new action before the next timeout */
-	else if (time_before(jiffies, (last_reset_time + ndev->watchdog_timeo)))
+	if (time_before(jiffies, (h->last_reset_time + ndev->watchdog_timeo)))
 		return;
 
-	priv->last_reset_time = jiffies;
-
+	/* request the reset */
 	if (h->ae_algo->ops->reset_event)
-		h->ae_algo->ops->reset_event(h, priv->reset_level);
-
-	priv->reset_level++;
-	if (priv->reset_level > HNAE3_GLOBAL_RESET)
-		priv->reset_level = HNAE3_GLOBAL_RESET;
+		h->ae_algo->ops->reset_event(h);
 }
 
 static const struct net_device_ops hns3_nic_netdev_ops = {
@@ -3122,8 +3109,8 @@ static int hns3_client_init(struct hnae3_handle *handle)
 	priv->dev = &pdev->dev;
 	priv->netdev = netdev;
 	priv->ae_handle = handle;
-	priv->last_reset_time = jiffies;
-	priv->reset_level = HNAE3_FUNC_RESET;
+	priv->ae_handle->reset_level = HNAE3_NONE_RESET;
+	priv->ae_handle->last_reset_time = jiffies;
 	priv->tx_timeout_count = 0;
 
 	handle->kinfo.netdev = netdev;
@@ -3355,7 +3342,6 @@ static int hns3_reset_notify_down_enet(struct hnae3_handle *handle)
 static int hns3_reset_notify_up_enet(struct hnae3_handle *handle)
 {
 	struct hnae3_knic_private_info *kinfo = &handle->kinfo;
-	struct hns3_nic_priv *priv = netdev_priv(kinfo->netdev);
 	int ret = 0;
 
 	if (netif_running(kinfo->netdev)) {
@@ -3365,8 +3351,7 @@ static int hns3_reset_notify_up_enet(struct hnae3_handle *handle)
 				   "hns net up fail, ret=%d!\n", ret);
 			return ret;
 		}
-
-		priv->last_reset_time = jiffies;
+		handle->last_reset_time = jiffies;
 	}
 
 	return ret;
@@ -3378,7 +3363,6 @@ static int hns3_reset_notify_init_enet(struct hnae3_handle *handle)
 	struct hns3_nic_priv *priv = netdev_priv(netdev);
 	int ret;
 
-	priv->reset_level = 1;
 	hns3_init_mac_addr(netdev);
 	hns3_nic_set_rx_mode(netdev);
 	hns3_recover_hw_addr(netdev);

drivers/net/ethernet/hisilicon/hns3/hns3_enet.h

@@ -532,8 +532,6 @@ struct hns3_nic_priv {
 	/* The most recently read link state */
 	int link;
 	u64 tx_timeout_count;
-	enum hnae3_reset_type reset_level;
-	unsigned long last_reset_time;
 
 	unsigned long state;
 

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -2749,7 +2749,7 @@ static int hclge_reset_wait(struct hclge_dev *hdev)
 	return 0;
 }
 
-static int hclge_func_reset_cmd(struct hclge_dev *hdev, int func_id)
+int hclge_func_reset_cmd(struct hclge_dev *hdev, int func_id)
 {
 	struct hclge_desc desc;
 	struct hclge_reset_cmd *req = (struct hclge_reset_cmd *)desc.data;
@@ -2845,27 +2845,31 @@ static void hclge_reset(struct hclge_dev *hdev)
 	hclge_notify_client(hdev, HNAE3_UP_CLIENT);
 }
 
-static void hclge_reset_event(struct hnae3_handle *handle,
-			      enum hnae3_reset_type reset)
+static void hclge_reset_event(struct hnae3_handle *handle)
 {
 	struct hclge_vport *vport = hclge_get_vport(handle);
 	struct hclge_dev *hdev = vport->back;
 
-	dev_info(&hdev->pdev->dev,
-		 "Receive reset event , reset_type is %d", reset);
+	/* check if this is a new reset request and we are not here just because
+	 * last reset attempt did not succeed and watchdog hit us again. We will
+	 * know this if last reset request did not occur very recently (watchdog
+	 * timer = 5*HZ, let us check after sufficiently large time, say 4*5*Hz)
+	 * In case of new request we reset the "reset level" to PF reset.
+	 */
+	if (time_after(jiffies, (handle->last_reset_time + 4 * 5 * HZ)))
+		handle->reset_level = HNAE3_FUNC_RESET;
 
-	switch (reset) {
-	case HNAE3_FUNC_RESET:
-	case HNAE3_CORE_RESET:
-	case HNAE3_GLOBAL_RESET:
-		/* request reset & schedule reset task */
-		set_bit(reset, &hdev->reset_request);
-		hclge_reset_task_schedule(hdev);
-		break;
-	default:
-		dev_warn(&hdev->pdev->dev, "Unsupported reset event:%d", reset);
-		break;
-	}
+	dev_info(&hdev->pdev->dev, "received reset event , reset type is %d",
+		 handle->reset_level);
+
+	/* request reset & schedule reset task */
+	set_bit(handle->reset_level, &hdev->reset_request);
+	hclge_reset_task_schedule(hdev);
+
+	if (handle->reset_level < HNAE3_GLOBAL_RESET)
+		handle->reset_level++;
+
+	handle->last_reset_time = jiffies;
 }
 
 static void hclge_reset_subtask(struct hclge_dev *hdev)

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

@@ -657,4 +657,5 @@ void hclge_mbx_handler(struct hclge_dev *hdev);
 void hclge_reset_tqp(struct hnae3_handle *handle, u16 queue_id);
 void hclge_reset_vf_queue(struct hclge_vport *vport, u16 queue_id);
 int hclge_cfg_flowctrl(struct hclge_dev *hdev);
+int hclge_func_reset_cmd(struct hclge_dev *hdev, int func_id);
 #endif

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_mbx.c

@@ -79,6 +79,18 @@ static int hclge_send_mbx_msg(struct hclge_vport *vport, u8 *msg, u16 msg_len,
 	return status;
 }
 
+int hclge_inform_reset_assert_to_vf(struct hclge_vport *vport)
+{
+	u8 msg_data[2];
+	u8 dest_vfid;
+
+	dest_vfid = (u8)vport->vport_id;
+
+	/* send this requested info to VF */
+	return hclge_send_mbx_msg(vport, msg_data, sizeof(u8),
+				  HCLGE_MBX_ASSERTING_RESET, dest_vfid);
+}
+
 static void hclge_free_vector_ring_chain(struct hnae3_ring_chain_node *head)
 {
 	struct hnae3_ring_chain_node *chain_tmp, *chain;
@@ -339,6 +351,33 @@ static void hclge_mbx_reset_vf_queue(struct hclge_vport *vport,
 	hclge_gen_resp_to_vf(vport, mbx_req, 0, NULL, 0);
 }
 
+static void hclge_reset_vf(struct hclge_vport *vport,
+			   struct hclge_mbx_vf_to_pf_cmd *mbx_req)
+{
+	struct hclge_dev *hdev = vport->back;
+	int ret;
+
+	dev_warn(&hdev->pdev->dev, "PF received VF reset request from VF %d!",
+		 mbx_req->mbx_src_vfid);
+
+	/* Acknowledge VF that PF is now about to assert the reset for the VF.
+	 * On receiving this message VF will get into pending state and will
+	 * start polling for the hardware reset completion status.
+	 */
+	ret = hclge_inform_reset_assert_to_vf(vport);
+	if (ret) {
+		dev_err(&hdev->pdev->dev,
+			"PF fail(%d) to inform VF(%d)of reset, reset failed!\n",
+			ret, vport->vport_id);
+		return;
+	}
+
+	dev_warn(&hdev->pdev->dev, "PF is now resetting VF %d.\n",
+		 mbx_req->mbx_src_vfid);
+	/* reset this virtual function */
+	hclge_func_reset_cmd(hdev, mbx_req->mbx_src_vfid);
+}
+
 void hclge_mbx_handler(struct hclge_dev *hdev)
 {
 	struct hclge_cmq_ring *crq = &hdev->hw.cmq.crq;
@@ -416,6 +455,9 @@ void hclge_mbx_handler(struct hclge_dev *hdev)
 		case HCLGE_MBX_QUEUE_RESET:
 			hclge_mbx_reset_vf_queue(vport, req);
 			break;
+		case HCLGE_MBX_RESET:
+			hclge_reset_vf(vport, req);
+			break;
 		default:
 			dev_err(&hdev->pdev->dev,
 				"un-supported mailbox message, code = %d\n",

drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c

@@ -315,6 +315,12 @@ int hclgevf_cmd_init(struct hclgevf_dev *hdev)
 		goto err_csq;
 	}
 
+	/* initialize the pointers of async rx queue of mailbox */
+	hdev->arq.hdev = hdev;
+	hdev->arq.head = 0;
+	hdev->arq.tail = 0;
+	hdev->arq.count = 0;
+
 	/* get firmware version */
 	ret = hclgevf_cmd_query_firmware_version(&hdev->hw, &version);
 	if (ret) {