From: Yufeng Mo <moyufeng@huawei.com>
Date: Wed, 10 Nov 2021 21:42:52 +0800
Subject: net: hns3: sync rx ring head in echo common pull
Patch-mainline: v5.16-rc1
Git-commit: 3b6db4a0492beed36545a2bc6075117faecebfe2
References: bsc#1190336

When the driver processes rx packets, the head pointer is updated only
after the number of received packets reaches 16. However, hardware
relies on the head pointer to calculate the number of FBDs. As a result,
the hardware calculates the FBD incorrectly. Therefore, the driver
proactively updates the head pointer in each common poll to ensure that
the number of FBDs calculated by the hardware is correct.

Fixes: 68752b24f51a ("net: hns3: schedule the polling again when allocation fails")
Signed-off-by: Yufeng Mo <moyufeng@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c          |    7 +++
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c   |    1 
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h   |    1 
 drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c |   32 +++++++++++++++
 drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.h |    9 ++++
 5 files changed, 50 insertions(+)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_enet.c
@@ -4210,6 +4210,13 @@ int hns3_clean_rx_ring(struct hns3_enet_
 	}
 
 out:
+	/* sync head pointer before exiting, since hardware will calculate
+	 * FBD number with head pointer
+	 */
+	if (unused_count > 0)
+		failure = failure ||
+			  hns3_nic_alloc_rx_buffers(ring, unused_count);
+
 	return failure ? budget : recv_pkts;
 }
 
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.c
@@ -483,6 +483,7 @@ static int hclge_firmware_compat_config(
 		if (hnae3_dev_phy_imp_supported(hdev))
 			hnae3_set_bit(compat, HCLGE_PHY_IMP_EN_B, 1);
 		hnae3_set_bit(compat, HCLGE_MAC_STATS_EXT_EN_B, 1);
+		hnae3_set_bit(compat, HCLGE_SYNC_RX_RING_HEAD_EN_B, 1);
 
 		req->compat = cpu_to_le32(compat);
 	}
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_cmd.h
@@ -1151,6 +1151,7 @@ struct hclge_query_ppu_pf_other_int_dfx_
 #define HCLGE_NCSI_ERROR_REPORT_EN_B	1
 #define HCLGE_PHY_IMP_EN_B		2
 #define HCLGE_MAC_STATS_EXT_EN_B	3
+#define HCLGE_SYNC_RX_RING_HEAD_EN_B	4
 struct hclge_firmware_compat_cmd {
 	__le32 compat;
 	u8 rsv[20];
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.c
@@ -434,8 +434,28 @@ err_csq:
 	return ret;
 }
 
+static int hclgevf_firmware_compat_config(struct hclgevf_dev *hdev, bool en)
+{
+	struct hclgevf_firmware_compat_cmd *req;
+	struct hclgevf_desc desc;
+	u32 compat = 0;
+
+	hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_IMP_COMPAT_CFG, false);
+
+	if (en) {
+		req = (struct hclgevf_firmware_compat_cmd *)desc.data;
+
+		hnae3_set_bit(compat, HCLGEVF_SYNC_RX_RING_HEAD_EN_B, 1);
+
+		req->compat = cpu_to_le32(compat);
+	}
+
+	return hclgevf_cmd_send(&hdev->hw, &desc, 1);
+}
+
 int hclgevf_cmd_init(struct hclgevf_dev *hdev)
 {
+	struct hnae3_ae_dev *ae_dev = pci_get_drvdata(hdev->pdev);
 	int ret;
 
 	spin_lock_bh(&hdev->hw.cmq.csq.lock);
@@ -484,6 +504,17 @@ int hclgevf_cmd_init(struct hclgevf_dev
 		 hnae3_get_field(hdev->fw_version, HNAE3_FW_VERSION_BYTE0_MASK,
 				 HNAE3_FW_VERSION_BYTE0_SHIFT));
 
+	if (ae_dev->dev_version >= HNAE3_DEVICE_VERSION_V3) {
+		/* ask the firmware to enable some features, driver can work
+		 * without it.
+		 */
+		ret = hclgevf_firmware_compat_config(hdev, true);
+		if (ret)
+			dev_warn(&hdev->pdev->dev,
+				 "Firmware compatible features not enabled(%d).\n",
+				 ret);
+	}
+
 	return 0;
 
 err_cmd_init:
@@ -508,6 +539,7 @@ static void hclgevf_cmd_uninit_regs(stru
 
 void hclgevf_cmd_uninit(struct hclgevf_dev *hdev)
 {
+	hclgevf_firmware_compat_config(hdev, false);
 	set_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state);
 	/* wait to ensure that the firmware completes the possible left
 	 * over commands.
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_cmd.h
@@ -15,6 +15,12 @@
 struct hclgevf_hw;
 struct hclgevf_dev;
 
+#define HCLGEVF_SYNC_RX_RING_HEAD_EN_B	4
+struct hclgevf_firmware_compat_cmd {
+	__le32 compat;
+	u8 rsv[20];
+};
+
 struct hclgevf_desc {
 	__le16 opcode;
 	__le16 flag;
@@ -107,6 +113,9 @@ enum hclgevf_opcode_type {
 	HCLGEVF_OPC_RSS_TC_MODE		= 0x0D08,
 	/* Mailbox cmd */
 	HCLGEVF_OPC_MBX_VF_TO_PF	= 0x2001,
+
+	/* IMP stats command */
+	HCLGEVF_OPC_IMP_COMPAT_CFG	= 0x701A,
 };
 
 #define HCLGEVF_TQP_REG_OFFSET		0x80000