net: hns3: add support to query tx spare buffer size for pf

Add support to query tx spare buffer size from configuration
file, and use this info to do spare buffer initialization when
the module parameter 'tx_spare_buf_size' is not specified.

Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -760,6 +760,7 @@ struct hnae3_knic_private_info {
 	u16 rx_buf_len;
 	u16 num_tx_desc;
 	u16 num_rx_desc;
+	u32 tx_spare_buf_size;
 
 	struct hnae3_tc_info tc_info;
 

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

@@ -1005,13 +1005,16 @@ static void hns3_init_tx_spare_buffer(struct hns3_enet_ring *ring)
 {
 	struct hns3_tx_spare *tx_spare;
 	struct page *page;
+	u32 alloc_size;
 	dma_addr_t dma;
 	int order;
 
-	if (!tx_spare_buf_size)
+	alloc_size = tx_spare_buf_size ? tx_spare_buf_size :
+		     ring->tqp->handle->kinfo.tx_spare_buf_size;
+	if (!alloc_size)
 		return;
 
-	order = get_order(tx_spare_buf_size);
+	order = get_order(alloc_size);
 	tx_spare = devm_kzalloc(ring_to_dev(ring), sizeof(*tx_spare),
 				GFP_KERNEL);
 	if (!tx_spare) {

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

@@ -542,6 +542,8 @@ struct hclge_pf_res_cmd {
 #define HCLGE_CFG_UMV_TBL_SPACE_M	GENMASK(31, 16)
 #define HCLGE_CFG_PF_RSS_SIZE_S		0
 #define HCLGE_CFG_PF_RSS_SIZE_M		GENMASK(3, 0)
+#define HCLGE_CFG_TX_SPARE_BUF_SIZE_S	4
+#define HCLGE_CFG_TX_SPARE_BUF_SIZE_M	GENMASK(15, 4)
 
 #define HCLGE_CFG_CMD_CNT		4
 

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

@@ -1279,6 +1279,7 @@ static u32 hclge_get_max_speed(u16 speed_ability)
 
 static void hclge_parse_cfg(struct hclge_cfg *cfg, struct hclge_desc *desc)
 {
+#define HCLGE_TX_SPARE_SIZE_UNIT		4096
 #define SPEED_ABILITY_EXT_SHIFT			8
 
 	struct hclge_cfg_param_cmd *req;
@@ -1358,6 +1359,15 @@ static void hclge_parse_cfg(struct hclge_cfg *cfg, struct hclge_desc *desc)
 	cfg->pf_rss_size_max = cfg->pf_rss_size_max ?
 			       1U << cfg->pf_rss_size_max :
 			       cfg->vf_rss_size_max;
+
+	/* The unit of the tx spare buffer size queried from configuration
+	 * file is HCLGE_TX_SPARE_SIZE_UNIT(4096) bytes, so a conversion is
+	 * needed here.
+	 */
+	cfg->tx_spare_buf_size = hnae3_get_field(__le32_to_cpu(req->param[2]),
+						 HCLGE_CFG_TX_SPARE_BUF_SIZE_M,
+						 HCLGE_CFG_TX_SPARE_BUF_SIZE_S);
+	cfg->tx_spare_buf_size *= HCLGE_TX_SPARE_SIZE_UNIT;
 }
 
 /* hclge_get_cfg: query the static parameter from flash
@@ -1539,6 +1549,7 @@ static int hclge_configure(struct hclge_dev *hdev)
 	hdev->tc_max = cfg.tc_num;
 	hdev->tm_info.hw_pfc_map = 0;
 	hdev->wanted_umv_size = cfg.umv_space;
+	hdev->tx_spare_buf_size = cfg.tx_spare_buf_size;
 	if (cfg.vlan_fliter_cap == HCLGE_VLAN_FLTR_CAN_MDF)
 		set_bit(HNAE3_DEV_SUPPORT_VLAN_FLTR_MDF_B, ae_dev->caps);
 
@@ -1736,6 +1747,7 @@ static int hclge_knic_setup(struct hclge_vport *vport, u16 num_tqps,
 	kinfo->num_rx_desc = num_rx_desc;
 
 	kinfo->rx_buf_len = hdev->rx_buf_len;
+	kinfo->tx_spare_buf_size = hdev->tx_spare_buf_size;
 
 	kinfo->tqp = devm_kcalloc(&hdev->pdev->dev, num_tqps,
 				  sizeof(struct hnae3_queue *), GFP_KERNEL);
@@ -11059,6 +11071,8 @@ static void hclge_info_show(struct hclge_dev *hdev)
 		 hdev->flag & HCLGE_FLAG_DCB_ENABLE ? "enable" : "disable");
 	dev_info(dev, "MQPRIO %s\n",
 		 hdev->flag & HCLGE_FLAG_MQPRIO_ENABLE ? "enable" : "disable");
+	dev_info(dev, "Default tx spare buffer size: %u\n",
+		 hdev->tx_spare_buf_size);
 
 	dev_info(dev, "PF info end.\n");
 }

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

@@ -384,6 +384,7 @@ struct hclge_cfg {
 	u8 mac_addr[ETH_ALEN];
 	u8 default_speed;
 	u32 numa_node_map;
+	u32 tx_spare_buf_size;
 	u16 speed_ability;
 	u16 umv_space;
 };
@@ -848,6 +849,7 @@ struct hclge_dev {
 	u16 alloc_rss_size;		/* Allocated RSS task queue */
 	u16 vf_rss_size_max;		/* HW defined VF max RSS task queue */
 	u16 pf_rss_size_max;		/* HW defined PF max RSS task queue */
+	u32 tx_spare_buf_size;		/* HW defined TX spare buffer size */
 
 	u16 fdir_pf_filter_count; /* Num of guaranteed filters for this PF */
 	u16 num_alloc_vport;		/* Num vports this driver supports */