net: hns3: getting tx and dv buffer size through firmware

This patch adds support of getting tx and dv buffer size through
firmware, because different version of hardware requires different
size of tx and dv buffer.

This patch also add dv_buf_size to tc' private buffer size even if
pfc is not enable for the tc.
Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -420,7 +420,9 @@ struct hclge_pf_res_cmd {
 #define HCLGE_PF_VEC_NUM_M		GENMASK(7, 0)
 	__le16 pf_intr_vector_number;
 	__le16 pf_own_fun_number;
-	__le32 rsv[3];
+	__le16 tx_buf_size;
+	__le16 dv_buf_size;
+	__le32 rsv[2];
 };
 
 #define HCLGE_CFG_OFFSET_S	0
@@ -839,6 +841,7 @@ struct hclge_serdes_lb_cmd {
 #define HCLGE_TOTAL_PKT_BUF		0x108000 /* 1.03125M bytes */
 #define HCLGE_DEFAULT_DV		0xA000	 /* 40k byte */
 #define HCLGE_DEFAULT_NON_DCB_DV	0x7800	/* 30K byte */
+#define HCLGE_NON_DCB_ADDITIONAL_BUF	0x200	/* 512 byte */
 
 #define HCLGE_TYPE_CRQ			0
 #define HCLGE_TYPE_CSQ			1

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

@@ -687,6 +687,18 @@ static int hclge_query_pf_resource(struct hclge_dev *hdev)
 	hdev->num_tqps = __le16_to_cpu(req->tqp_num);
 	hdev->pkt_buf_size = __le16_to_cpu(req->buf_size) << HCLGE_BUF_UNIT_S;
 
+	if (req->tx_buf_size)
+		hdev->tx_buf_size =
+			__le16_to_cpu(req->tx_buf_size) << HCLGE_BUF_UNIT_S;
+	else
+		hdev->tx_buf_size = HCLGE_DEFAULT_TX_BUF;
+
+	if (req->dv_buf_size)
+		hdev->dv_buf_size =
+			__le16_to_cpu(req->dv_buf_size) << HCLGE_BUF_UNIT_S;
+	else
+		hdev->dv_buf_size = HCLGE_DEFAULT_DV;
+
 	if (hnae3_dev_roce_supported(hdev)) {
 		hdev->roce_base_msix_offset =
 		hnae3_get_field(__le16_to_cpu(req->msixcap_localid_ba_rocee),
@@ -1376,9 +1388,10 @@ static bool  hclge_is_rx_buf_ok(struct hclge_dev *hdev,
 	pfc_enable_num = hclge_get_pfc_enalbe_num(hdev);
 
 	if (hnae3_dev_dcb_supported(hdev))
-		shared_buf_min = 2 * hdev->mps + HCLGE_DEFAULT_DV;
+		shared_buf_min = 2 * hdev->mps + hdev->dv_buf_size;
 	else
-		shared_buf_min = 2 * hdev->mps + HCLGE_DEFAULT_NON_DCB_DV;
+		shared_buf_min = hdev->mps + HCLGE_NON_DCB_ADDITIONAL_BUF
+					+ hdev->dv_buf_size;
 
 	shared_buf_tc = pfc_enable_num * hdev->mps +
 			(tc_num - pfc_enable_num) * hdev->mps / 2 +
@@ -1391,8 +1404,15 @@ static bool  hclge_is_rx_buf_ok(struct hclge_dev *hdev,
 
 	shared_buf = rx_all - rx_priv;
 	buf_alloc->s_buf.buf_size = shared_buf;
-	buf_alloc->s_buf.self.high = shared_buf;
-	buf_alloc->s_buf.self.low =  2 * hdev->mps;
+	if (hnae3_dev_dcb_supported(hdev)) {
+		buf_alloc->s_buf.self.high = shared_buf - hdev->dv_buf_size;
+		buf_alloc->s_buf.self.low = buf_alloc->s_buf.self.high
+						- hdev->mps / 2;
+	} else {
+		buf_alloc->s_buf.self.high = hdev->mps +
+						HCLGE_NON_DCB_ADDITIONAL_BUF;
+		buf_alloc->s_buf.self.low = hdev->mps / 2;
+	}
 
 	for (i = 0; i < HCLGE_MAX_TC_NUM; i++) {
 		if ((hdev->hw_tc_map & BIT(i)) &&
@@ -1419,11 +1439,11 @@ static int hclge_tx_buffer_calc(struct hclge_dev *hdev,
 	for (i = 0; i < HCLGE_MAX_TC_NUM; i++) {
 		struct hclge_priv_buf *priv = &buf_alloc->priv_buf[i];
 
-		if (total_size < HCLGE_DEFAULT_TX_BUF)
+		if (total_size < hdev->tx_buf_size)
 			return -ENOMEM;
 
 		if (hdev->hw_tc_map & BIT(i))
-			priv->tx_buf_size = HCLGE_DEFAULT_TX_BUF;
+			priv->tx_buf_size = hdev->tx_buf_size;
 		else
 			priv->tx_buf_size = 0;
 
@@ -1469,11 +1489,12 @@ static int hclge_rx_buffer_calc(struct hclge_dev *hdev,
 				priv->wl.low = aligned_mps;
 				priv->wl.high = priv->wl.low + aligned_mps;
 				priv->buf_size = priv->wl.high +
-						HCLGE_DEFAULT_DV;
+						hdev->dv_buf_size;
 			} else {
 				priv->wl.low = 0;
 				priv->wl.high = 2 * aligned_mps;
-				priv->buf_size = priv->wl.high;
+				priv->buf_size = priv->wl.high +
+						hdev->dv_buf_size;
 			}
 		} else {
 			priv->enable = 0;
@@ -1505,11 +1526,11 @@ static int hclge_rx_buffer_calc(struct hclge_dev *hdev,
 		if (hdev->tm_info.hw_pfc_map & BIT(i)) {
 			priv->wl.low = 128;
 			priv->wl.high = priv->wl.low + aligned_mps;
-			priv->buf_size = priv->wl.high + HCLGE_DEFAULT_DV;
+			priv->buf_size = priv->wl.high + hdev->dv_buf_size;
 		} else {
 			priv->wl.low = 0;
 			priv->wl.high = aligned_mps;
-			priv->buf_size = priv->wl.high;
+			priv->buf_size = priv->wl.high + hdev->dv_buf_size;
 		}
 	}
 

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

@@ -736,6 +736,9 @@ struct hclge_dev {
 	u32 flag;
 
 	u32 pkt_buf_size; /* Total pf buf size for tx/rx */
+	u32 tx_buf_size; /* Tx buffer size for each TC */
+	u32 dv_buf_size; /* Dv buffer size for each TC */
+
 	u32 mps; /* Max packet size */
 	/* vport_lock protect resource shared by vports */
 	struct mutex vport_lock;