net: hns3: add support to set/get rx buf len via ethtool for hns3 driver

Rx buf len is for rx BD buffer size, support setting it via ethtool -G
parameter and getting it via ethtool -g parameter.

Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
index e35a266..6b49ecb 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
@@ -649,7 +649,7 @@ static void hns3_get_ringparam(struct net_device *netdev,
 {
        struct hns3_nic_priv *priv = netdev_priv(netdev);
        struct hnae3_handle *h = priv->ae_handle;
-       int queue_num = h->kinfo.num_tqps;
+       int rx_queue_index = h->kinfo.num_tqps;
 
        if (hns3_nic_resetting(netdev)) {
                netdev_err(netdev, "dev resetting!");
@@ -660,7 +660,8 @@ static void hns3_get_ringparam(struct net_device *netdev,
        param->rx_max_pending = HNS3_RING_MAX_PENDING;
 
        param->tx_pending = priv->ring[0].desc_num;
-       param->rx_pending = priv->ring[queue_num].desc_num;
+       param->rx_pending = priv->ring[rx_queue_index].desc_num;
+       kernel_param->rx_buf_len = priv->ring[rx_queue_index].buf_size;
 }
 
 static void hns3_get_pauseparam(struct net_device *netdev,
@@ -1062,14 +1063,23 @@ static struct hns3_enet_ring *hns3_backup_ringparam(struct hns3_nic_priv *priv)
 }
 
 static int hns3_check_ringparam(struct net_device *ndev,
-                               struct ethtool_ringparam *param)
+                               struct ethtool_ringparam *param,
+                               struct kernel_ethtool_ringparam *kernel_param)
 {
+#define RX_BUF_LEN_2K 2048
+#define RX_BUF_LEN_4K 4096
        if (hns3_nic_resetting(ndev))
                return -EBUSY;
 
        if (param->rx_mini_pending || param->rx_jumbo_pending)
                return -EINVAL;
 
+       if (kernel_param->rx_buf_len != RX_BUF_LEN_2K &&
+           kernel_param->rx_buf_len != RX_BUF_LEN_4K) {
+               netdev_err(ndev, "Rx buf len only support 2048 and 4096\n");
+               return -EINVAL;
+       }
+
        if (param->tx_pending > HNS3_RING_MAX_PENDING ||
            param->tx_pending < HNS3_RING_MIN_PENDING ||
            param->rx_pending > HNS3_RING_MAX_PENDING ||
@@ -1082,6 +1092,22 @@ static int hns3_check_ringparam(struct net_device *ndev,
        return 0;
 }
 
+static int hns3_change_rx_buf_len(struct net_device *ndev, u32 rx_buf_len)
+{
+       struct hns3_nic_priv *priv = netdev_priv(ndev);
+       struct hnae3_handle *h = priv->ae_handle;
+       int i;
+
+       h->kinfo.rx_buf_len = rx_buf_len;
+
+       for (i = 0; i < h->kinfo.num_tqps; i++) {
+               h->kinfo.tqp[i]->buf_size = rx_buf_len;
+               priv->ring[i + h->kinfo.num_tqps].buf_size = rx_buf_len;
+       }
+
+       return 0;
+}
+
 static int hns3_set_ringparam(struct net_device *ndev,
                              struct ethtool_ringparam *param,
                              struct kernel_ethtool_ringparam *kernel_param,
@@ -1094,9 +1120,10 @@ static int hns3_set_ringparam(struct net_device *ndev,
        u32 old_tx_desc_num, new_tx_desc_num;
        u32 old_rx_desc_num, new_rx_desc_num;
        u16 queue_num = h->kinfo.num_tqps;
+       u32 old_rx_buf_len;
        int ret, i;
 
-       ret = hns3_check_ringparam(ndev, param);
+       ret = hns3_check_ringparam(ndev, param, kernel_param);
        if (ret)
                return ret;
 
@@ -1105,8 +1132,10 @@ static int hns3_set_ringparam(struct net_device *ndev,
        new_rx_desc_num = ALIGN(param->rx_pending, HNS3_RING_BD_MULTIPLE);
        old_tx_desc_num = priv->ring[0].desc_num;
        old_rx_desc_num = priv->ring[queue_num].desc_num;
+       old_rx_buf_len = priv->ring[queue_num].buf_size;
        if (old_tx_desc_num == new_tx_desc_num &&
-           old_rx_desc_num == new_rx_desc_num)
+           old_rx_desc_num == new_rx_desc_num &&
+           kernel_param->rx_buf_len == old_rx_buf_len)
                return 0;
 
        tmp_rings = hns3_backup_ringparam(priv);
@@ -1117,19 +1146,22 @@ static int hns3_set_ringparam(struct net_device *ndev,
        }
 
        netdev_info(ndev,
-                   "Changing Tx/Rx ring depth from %u/%u to %u/%u\n",
+                   "Changing Tx/Rx ring depth from %u/%u to %u/%u, Changing rx buffer len from %d to %d\n",
                    old_tx_desc_num, old_rx_desc_num,
-                   new_tx_desc_num, new_rx_desc_num);
+                   new_tx_desc_num, new_rx_desc_num,
+                   old_rx_buf_len, kernel_param->rx_buf_len);
 
        if (if_running)
                ndev->netdev_ops->ndo_stop(ndev);
 
        hns3_change_all_ring_bd_num(priv, new_tx_desc_num, new_rx_desc_num);
+       hns3_change_rx_buf_len(ndev, kernel_param->rx_buf_len);
        ret = hns3_init_all_ring(priv);
        if (ret) {
-               netdev_err(ndev, "Change bd num fail, revert to old value(%d)\n",
+               netdev_err(ndev, "set ringparam fail, revert to old value(%d)\n",
                           ret);
 
+               hns3_change_rx_buf_len(ndev, old_rx_buf_len);
                hns3_change_all_ring_bd_num(priv, old_tx_desc_num,
                                            old_rx_desc_num);
                for (i = 0; i < h->kinfo.num_tqps * 2; i++)
@@ -1811,6 +1843,8 @@ static int hns3_set_tunable(struct net_device *netdev,
                                 ETHTOOL_COALESCE_MAX_FRAMES |          \
                                 ETHTOOL_COALESCE_USE_CQE)
 
+#define HNS3_ETHTOOL_RING      ETHTOOL_RING_USE_RX_BUF_LEN
+
 static int hns3_get_ts_info(struct net_device *netdev,
                            struct ethtool_ts_info *info)
 {
@@ -1889,6 +1923,7 @@ static int hns3_get_link_ext_state(struct net_device *netdev,
 
 static const struct ethtool_ops hns3vf_ethtool_ops = {
        .supported_coalesce_params = HNS3_ETHTOOL_COALESCE,
+       .supported_ring_params = HNS3_ETHTOOL_RING,
        .get_drvinfo = hns3_get_drvinfo,
        .get_ringparam = hns3_get_ringparam,
        .set_ringparam = hns3_set_ringparam,
@@ -1920,6 +1955,7 @@ static const struct ethtool_ops hns3vf_ethtool_ops = {
 
 static const struct ethtool_ops hns3_ethtool_ops = {
        .supported_coalesce_params = HNS3_ETHTOOL_COALESCE,
+       .supported_ring_params = HNS3_ETHTOOL_RING,
        .self_test = hns3_self_test,
        .get_drvinfo = hns3_get_drvinfo,
        .get_link = hns3_get_link,