net:hns: Add Hip06 "RSS(Receive Side Scaling)" support to HNS Driver

This patch adds the support of "RSS (Receive Side Scaling)" feature
provided by the Hip06 ethernet hardware to the HNS ethernet
driver.

This feature helps in distributing the different flows (mapped as
hash by hardware using Toeplitz Hash) to different Queues asssociated
with the processor cores. The mapping of flow-hash values to the
different queues is stored in indirection table (which is per Packet-
parse-Engine/PPE). This patch also provides the changes to re-program
the (flow-hash<->Qid) mapping using the ethtool.

Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Reviewed-by: Kenneth Lee <liguozhu@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 93 insertions, 0 deletions

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
index 9df63ae13915..3b234176dd36 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_ethtool.c
@@ -1187,6 +1187,95 @@ static int hns_nic_nway_reset(struct net_device *netdev)
 	return ret;
 }
 
+static u32
+hns_get_rss_key_size(struct net_device *netdev)
+{
+	struct hns_nic_priv *priv = netdev_priv(netdev);
+	struct hnae_ae_ops *ops;
+	u32 ret;
+
+	if (AE_IS_VER1(priv->enet_ver)) {
+		netdev_err(netdev,
+			   "RSS feature is not supported on this hardware\n");
+		return -EOPNOTSUPP;
+	}
+
+	ops = priv->ae_handle->dev->ops;
+	ret = ops->get_rss_key_size(priv->ae_handle);
+
+	return ret;
+}
+
+static u32
+hns_get_rss_indir_size(struct net_device *netdev)
+{
+	struct hns_nic_priv *priv = netdev_priv(netdev);
+	struct hnae_ae_ops *ops;
+	u32 ret;
+
+	if (AE_IS_VER1(priv->enet_ver)) {
+		netdev_err(netdev,
+			   "RSS feature is not supported on this hardware\n");
+		return -EOPNOTSUPP;
+	}
+
+	ops = priv->ae_handle->dev->ops;
+	ret = ops->get_rss_indir_size(priv->ae_handle);
+
+	return ret;
+}
+
+static int
+hns_get_rss(struct net_device *netdev, u32 *indir, u8 *key, u8 *hfunc)
+{
+	struct hns_nic_priv *priv = netdev_priv(netdev);
+	struct hnae_ae_ops *ops;
+	int ret;
+
+	if (AE_IS_VER1(priv->enet_ver)) {
+		netdev_err(netdev,
+			   "RSS feature is not supported on this hardware\n");
+		return -EOPNOTSUPP;
+	}
+
+	ops = priv->ae_handle->dev->ops;
+
+	if (!indir)
+		return 0;
+
+	ret = ops->get_rss(priv->ae_handle, indir, key, hfunc);
+
+	return 0;
+}
+
+static int
+hns_set_rss(struct net_device *netdev, const u32 *indir, const u8 *key,
+	    const u8 hfunc)
+{
+	struct hns_nic_priv *priv = netdev_priv(netdev);
+	struct hnae_ae_ops *ops;
+	int ret;
+
+	if (AE_IS_VER1(priv->enet_ver)) {
+		netdev_err(netdev,
+			   "RSS feature is not supported on this hardware\n");
+		return -EOPNOTSUPP;
+	}
+
+	ops = priv->ae_handle->dev->ops;
+
+	/* currently hfunc can only be Toeplitz hash */
+	if (key ||
+	    (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP))
+		return -EOPNOTSUPP;
+	if (!indir)
+		return 0;
+
+	ret = ops->set_rss(priv->ae_handle, indir, key, hfunc);
+
+	return 0;
+}
+
 static struct ethtool_ops hns_ethtool_ops = {
 	.get_drvinfo = hns_nic_get_drvinfo,
 	.get_link  = hns_nic_get_link,
@@ -1206,6 +1295,10 @@ static struct ethtool_ops hns_ethtool_ops = {
 	.get_regs_len = hns_get_regs_len,
 	.get_regs = hns_get_regs,
 	.nway_reset = hns_nic_nway_reset,
+	.get_rxfh_key_size = hns_get_rss_key_size,
+	.get_rxfh_indir_size = hns_get_rss_indir_size,
+	.get_rxfh = hns_get_rss,
+	.set_rxfh = hns_set_rss,
 };
 
 void hns_ethtool_set_ops(struct net_device *ndev)