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Date: Wed, 5 Nov 2014 13:59:29 +0200
From: Amir Vadai <amirv@...lanox.com>
To: "David S. Miller" <davem@...emloft.net>,
Ben Hutchings <ben@...adent.org.uk>
Cc: netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
Eyal Perry <eyalpe@...lanox.com>,
Yevgeny Petrilin <yevgenyp@...lanox.com>,
Amir Vadai <amirv@...lanox.com>
Subject: [PATCH net-next 2/2] net/mlx4_en: Support for configurable RSS hash function
From: Eyal Perry <eyalpe@...lanox.com>
The ConnectX HW is capable of using one of the following hash functions:
Toeplitz and an XOR hash function.
This patch implements ethtool_ops {get,set}_rxfh_func callbacks for the
mlx4_en driver in order to query and configure the RSS hash function to
be used by the device.
Signed-off-by: Eyal Perry <eyalpe@...lanox.com>
Signed-off-by: Amir Vadai <amirv@...lanox.com>
---
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 40 +++++++++++++++++++++++++
drivers/net/ethernet/mellanox/mlx4/en_netdev.c | 9 ++++++
drivers/net/ethernet/mellanox/mlx4/en_rx.c | 11 ++++---
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 3 +-
4 files changed, 58 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index 8ea4d5b..f33785a 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -973,6 +973,44 @@ static u32 mlx4_en_get_rxfh_indir_size(struct net_device *dev)
return priv->rx_ring_num;
}
+static u32 mlx4_en_get_rxfh_func(struct net_device *dev)
+{
+ struct mlx4_en_priv *priv = netdev_priv(dev);
+
+ return priv->rss_hash_fn;
+}
+
+static int mlx4_en_set_rxfh_func(struct net_device *dev, u32 hfunc)
+{
+ struct mlx4_en_priv *priv = netdev_priv(dev);
+ struct mlx4_en_dev *mdev = priv->mdev;
+ u32 prev_rss_hash_fn = priv->rss_hash_fn;
+ int err = 0;
+
+ if (!(hfunc & priv->rss_hash_fn_caps))
+ return -EINVAL;
+
+ priv->rss_hash_fn = hfunc;
+ if (hfunc == RSS_HASH_TOP && !(dev->features & NETIF_F_RXHASH))
+ en_warn(priv,
+ "Toeplitz hash function should be used in conjunction with RX hashing for optimal performance\n");
+ if (hfunc == RSS_HASH_XOR && (dev->features & NETIF_F_RXHASH))
+ en_warn(priv,
+ "Enabling both XOR Hash function and RX Hashing can limit RPS functionality\n");
+
+ mutex_lock(&mdev->state_lock);
+ if (priv->port_up && priv->rss_hash_fn != prev_rss_hash_fn) {
+ mlx4_en_stop_port(dev, 1);
+ err = mlx4_en_start_port(dev);
+ }
+ mutex_unlock(&mdev->state_lock);
+
+ if (err)
+ en_err(priv, "Failed to restart port %d\n", priv->port);
+
+ return err;
+}
+
static int mlx4_en_get_rxfh(struct net_device *dev, u32 *ring_index, u8 *key)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
@@ -1799,6 +1837,8 @@ const struct ethtool_ops mlx4_en_ethtool_ops = {
.get_rxnfc = mlx4_en_get_rxnfc,
.set_rxnfc = mlx4_en_set_rxnfc,
.get_rxfh_indir_size = mlx4_en_get_rxfh_indir_size,
+ .get_rxfh_func = mlx4_en_get_rxfh_func,
+ .set_rxfh_func = mlx4_en_set_rxfh_func,
.get_rxfh = mlx4_en_get_rxfh,
.set_rxfh = mlx4_en_set_rxfh,
.get_channels = mlx4_en_get_channels,
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
index 0efbae9..a9e96a6 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c
@@ -2585,6 +2585,15 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
dev->features |= NETIF_F_GSO_UDP_TUNNEL;
}
+ if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_XOR) {
+ priv->rss_hash_fn_caps |= RSS_HASH_XOR;
+ priv->rss_hash_fn = RSS_HASH_XOR;
+ }
+ if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_TOP) {
+ priv->rss_hash_fn_caps |= RSS_HASH_TOP;
+ priv->rss_hash_fn = RSS_HASH_TOP;
+ }
+
mdev->pndev[port] = dev;
netif_carrier_off(dev);
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index b173a0c..41c1ff9 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -1113,10 +1113,13 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
}
rss_context->flags = rss_mask;
- rss_context->hash_fn = MLX4_RSS_HASH_TOP;
- for (i = 0; i < 10; i++)
- rss_context->rss_key[i] = cpu_to_be32(rsskey[i]);
-
+ if (priv->rss_hash_fn & MLX4_RSS_HASH_XOR) {
+ rss_context->hash_fn = MLX4_RSS_HASH_XOR;
+ } else {
+ rss_context->hash_fn = MLX4_RSS_HASH_TOP;
+ for (i = 0; i < 10; i++)
+ rss_context->rss_key[i] = cpu_to_be32(rsskey[i]);
+ }
err = mlx4_qp_to_ready(mdev->dev, &priv->res.mtt, &context,
&rss_map->indir_qp, &rss_map->indir_state);
if (err)
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index ef83d12..e1c3364 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -375,7 +375,6 @@ struct mlx4_en_port_profile {
};
struct mlx4_en_profile {
- int rss_xor;
int udp_rss;
u8 rss_mask;
u32 active_ports;
@@ -615,6 +614,8 @@ struct mlx4_en_priv {
__be16 vxlan_port;
u32 pflags;
+ u8 rss_hash_fn;
+ u8 rss_hash_fn_caps;
};
enum mlx4_en_wol {
--
1.8.3.4
--
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