From: Yunsheng Lin <linyunsheng@huawei.com>
Date: Tue, 15 May 2018 19:20:11 +0100
Subject: net: hns3: Fixes the back pressure setting when sriov is enabled
Patch-mainline: v4.18-rc1
Git-commit: 67bf2541f4b9a091e928d75eca544bca4c5db142
References: bsc#1104353 FATE#326415

When sriov is enabled, the Qset and tc mapping is not longer one
to one relation.

This patch fixes it by mapping all pf and vf's Qset to tc.

Fixes: 848440544b41 ("net: hns3: Add support of TX Scheduler & Shaper to HNS3 driver")
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c |   45 ++++++++++++++++--
 drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.h |    5 ++
 2 files changed, 45 insertions(+), 5 deletions(-)

--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.c
@@ -500,7 +500,8 @@ static int hclge_tm_qs_schd_mode_cfg(str
 	return hclge_cmd_send(&hdev->hw, &desc, 1);
 }
 
-static int hclge_tm_qs_bp_cfg(struct hclge_dev *hdev, u8 tc)
+static int hclge_tm_qs_bp_cfg(struct hclge_dev *hdev, u8 tc, u8 grp_id,
+			      u32 bit_map)
 {
 	struct hclge_bp_to_qs_map_cmd *bp_to_qs_map_cmd;
 	struct hclge_desc desc;
@@ -511,9 +512,8 @@ static int hclge_tm_qs_bp_cfg(struct hcl
 	bp_to_qs_map_cmd = (struct hclge_bp_to_qs_map_cmd *)desc.data;
 
 	bp_to_qs_map_cmd->tc_id = tc;
-
-	/* Qset and tc is one by one mapping */
-	bp_to_qs_map_cmd->qs_bit_map = cpu_to_le32(1 << tc);
+	bp_to_qs_map_cmd->qs_group_id = grp_id;
+	bp_to_qs_map_cmd->qs_bit_map = cpu_to_le32(bit_map);
 
 	return hclge_cmd_send(&hdev->hw, &desc, 1);
 }
@@ -1167,6 +1167,41 @@ static int hclge_pfc_setup_hw(struct hcl
 				      hdev->tm_info.hw_pfc_map);
 }
 
+/* Each Tc has a 1024 queue sets to backpress, it divides to
+ * 32 group, each group contains 32 queue sets, which can be
+ * represented by u32 bitmap.
+ */
+static int hclge_bp_setup_hw(struct hclge_dev *hdev, u8 tc)
+{
+	struct hclge_vport *vport = hdev->vport;
+	u32 i, k, qs_bitmap;
+	int ret;
+
+	for (i = 0; i < HCLGE_BP_GRP_NUM; i++) {
+		qs_bitmap = 0;
+
+		for (k = 0; k < hdev->num_alloc_vport; k++) {
+			u16 qs_id = vport->qs_offset + tc;
+			u8 grp, sub_grp;
+
+			grp = hnae_get_field(qs_id, HCLGE_BP_GRP_ID_M,
+					     HCLGE_BP_GRP_ID_S);
+			sub_grp = hnae_get_field(qs_id, HCLGE_BP_SUB_GRP_ID_M,
+						 HCLGE_BP_SUB_GRP_ID_S);
+			if (i == grp)
+				qs_bitmap |= (1 << sub_grp);
+
+			vport++;
+		}
+
+		ret = hclge_tm_qs_bp_cfg(hdev, tc, i, qs_bitmap);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
 static int hclge_mac_pause_setup_hw(struct hclge_dev *hdev)
 {
 	bool tx_en, rx_en;
@@ -1218,7 +1253,7 @@ int hclge_pause_setup_hw(struct hclge_de
 		dev_warn(&hdev->pdev->dev, "set pfc pause failed:%d\n", ret);
 
 	for (i = 0; i < hdev->tm_info.num_tc; i++) {
-		ret = hclge_tm_qs_bp_cfg(hdev, i);
+		ret = hclge_bp_setup_hw(hdev, i);
 		if (ret)
 			return ret;
 	}
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.h
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_tm.h
@@ -89,6 +89,11 @@ struct hclge_pg_shapping_cmd {
 	__le32 pg_shapping_para;
 };
 
+#define HCLGE_BP_GRP_NUM		32
+#define HCLGE_BP_SUB_GRP_ID_S		0
+#define HCLGE_BP_SUB_GRP_ID_M		GENMASK(4, 0)
+#define HCLGE_BP_GRP_ID_S		5
+#define HCLGE_BP_GRP_ID_M		GENMASK(9, 5)
 struct hclge_bp_to_qs_map_cmd {
 	u8 tc_id;
 	u8 rsvd[2];