From 947cbb0ac242096d60380952ec1a1761372cba66 Mon Sep 17 00:00:00 2001 From: Eyal Perry Date: Tue, 2 Dec 2014 18:12:11 +0200 Subject: [PATCH] net/mlx4_en: Support for configurable RSS hash function The ConnectX HW is capable of using one of the following hash functions: Toeplitz and an XOR hash function. This patch extends the implementation of the mlx4_en driver set/get_rxfh callbacks to support getting and setting the RSS hash function used by the device. Signed-off-by: Eyal Perry Signed-off-by: Amir Vadai Signed-off-by: David S. Miller --- .../net/ethernet/mellanox/mlx4/en_ethtool.c | 34 ++++++++++++++++--- .../net/ethernet/mellanox/mlx4/en_netdev.c | 11 ++++++ drivers/net/ethernet/mellanox/mlx4/en_rx.c | 14 +++++++- drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 +- 4 files changed, 54 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c index 28c3fc5a0791..90e0f045a6bc 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c @@ -978,6 +978,27 @@ static u32 mlx4_en_get_rxfh_key_size(struct net_device *netdev) return MLX4_EN_RSS_KEY_SIZE; } +static int mlx4_en_check_rxfh_func(struct net_device *dev, u8 hfunc) +{ + struct mlx4_en_priv *priv = netdev_priv(dev); + + /* check if requested function is supported by the device */ + if ((hfunc == ETH_RSS_HASH_TOP && + !(priv->mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_TOP)) || + (hfunc == ETH_RSS_HASH_XOR && + !(priv->mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_XOR))) + return -EINVAL; + + priv->rss_hash_fn = hfunc; + if (hfunc == ETH_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 == ETH_RSS_HASH_XOR && (dev->features & NETIF_F_RXHASH)) + en_warn(priv, + "Enabling both XOR Hash function and RX Hashing can limit RPS functionality\n"); + return 0; +} + static int mlx4_en_get_rxfh(struct net_device *dev, u32 *ring_index, u8 *key, u8 *hfunc) { @@ -999,7 +1020,7 @@ static int mlx4_en_get_rxfh(struct net_device *dev, u32 *ring_index, u8 *key, if (key) memcpy(key, priv->rss_key, MLX4_EN_RSS_KEY_SIZE); if (hfunc) - *hfunc = ETH_RSS_HASH_TOP; + *hfunc = priv->rss_hash_fn; return err; } @@ -1013,10 +1034,6 @@ static int mlx4_en_set_rxfh(struct net_device *dev, const u32 *ring_index, int i; int rss_rings = 0; - /* We do not allow change in unsupported parameters */ - if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP) - return -EOPNOTSUPP; - /* Calculate RSS table size and make sure flows are spread evenly * between rings */ @@ -1037,6 +1054,12 @@ static int mlx4_en_set_rxfh(struct net_device *dev, const u32 *ring_index, if (!is_power_of_2(rss_rings)) return -EINVAL; + if (hfunc != ETH_RSS_HASH_NO_CHANGE) { + err = mlx4_en_check_rxfh_func(dev, hfunc); + if (err) + return err; + } + mutex_lock(&mdev->state_lock); if (priv->port_up) { port_up = 1; @@ -1047,6 +1070,7 @@ static int mlx4_en_set_rxfh(struct net_device *dev, const u32 *ring_index, priv->prof->rss_rings = rss_rings; if (key) memcpy(priv->rss_key, key, MLX4_EN_RSS_KEY_SIZE); + if (port_up) { err = mlx4_en_start_port(dev); if (err) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c index 1597fb07576c..dccf0e1f86be 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_netdev.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_netdev.c @@ -2608,6 +2608,17 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port, if (mdev->dev->caps.steering_mode != MLX4_STEERING_MODE_A0) dev->priv_flags |= IFF_UNICAST_FLT; + /* Setting a default hash function value */ + if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_TOP) { + priv->rss_hash_fn = ETH_RSS_HASH_TOP; + } else if (mdev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_RSS_XOR) { + priv->rss_hash_fn = ETH_RSS_HASH_XOR; + } else { + en_warn(priv, + "No RSS hash capabilities exposed, using Toeplitz\n"); + priv->rss_hash_fn = ETH_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 946d35280abc..4ca396e3168f 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -1223,7 +1223,19 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv) rss_context->flags = rss_mask; rss_context->hash_fn = MLX4_RSS_HASH_TOP; - memcpy(rss_context->rss_key, priv->rss_key, MLX4_EN_RSS_KEY_SIZE); + if (priv->rss_hash_fn == ETH_RSS_HASH_XOR) { + rss_context->hash_fn = MLX4_RSS_HASH_XOR; + } else if (priv->rss_hash_fn == ETH_RSS_HASH_TOP) { + rss_context->hash_fn = MLX4_RSS_HASH_TOP; + memcpy(rss_context->rss_key, priv->rss_key, + MLX4_EN_RSS_KEY_SIZE); + netdev_rss_key_fill(rss_context->rss_key, + MLX4_EN_RSS_KEY_SIZE); + } else { + en_err(priv, "Unknown RSS hash function requested\n"); + err = -EINVAL; + goto indir_err; + } 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 aaa7efbb9664..ac48a8d91501 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h @@ -376,7 +376,6 @@ struct mlx4_en_port_profile { }; struct mlx4_en_profile { - int rss_xor; int udp_rss; u8 rss_mask; u32 active_ports; @@ -619,6 +618,7 @@ struct mlx4_en_priv { u32 pflags; u8 rss_key[MLX4_EN_RSS_KEY_SIZE]; + u8 rss_hash_fn; }; enum mlx4_en_wol { -- 2.20.1