mlx4_en: set number of rx rings used by RSS using ethtool

Value must be a power of 2 due to HW limitation.
Driver supports only 'equal' mode in ethtool and can't be set by using weights.

Signed-off-by: Amir Vadai <amirv@mellanox.co.il>
Reviewed-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 102 insertions, 7 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index 7dbc6a230779..53c66869aecd 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -479,6 +479,95 @@ static void mlx4_en_get_ringparam(struct net_device *dev,
         param->tx_pending = priv->tx_ring[0].size;
 }
 
+static u32 mlx4_en_get_rxfh_indir_size(struct net_device *dev)
+{
+        struct mlx4_en_priv *priv = netdev_priv(dev);
+
+        return priv->rx_ring_num;
+}
+
+static int mlx4_en_get_rxfh_indir(struct net_device *dev, u32 *ring_index)
+{
+        struct mlx4_en_priv *priv = netdev_priv(dev);
+        struct mlx4_en_rss_map *rss_map = &priv->rss_map;
+        int rss_rings;
+        size_t n = priv->rx_ring_num;
+        int err = 0;
+
+        rss_rings = priv->prof->rss_rings ?: priv->rx_ring_num;
+
+        while (n--) {
+                ring_index[n] = rss_map->qps[n % rss_rings].qpn -
+                        rss_map->base_qpn;
+        }
+
+        return err;
+}
+
+static int mlx4_en_set_rxfh_indir(struct net_device *dev,
+                const u32 *ring_index)
+{
+        struct mlx4_en_priv *priv = netdev_priv(dev);
+        struct mlx4_en_dev *mdev = priv->mdev;
+        int port_up = 0;
+        int err = 0;
+        int i;
+        int rss_rings = 0;
+
+        /* Calculate RSS table size and make sure flows are spread evenly
+         * between rings
+         */
+        for (i = 0; i < priv->rx_ring_num; i++) {
+                if (i > 0 && !ring_index[i] && !rss_rings)
+                        rss_rings = i;
+
+                if (ring_index[i] != (i % (rss_rings ?: priv->rx_ring_num)))
+                        return -EINVAL;
+        }
+
+        if (!rss_rings)
+                rss_rings = priv->rx_ring_num;
+
+        /* RSS table size must be an order of 2 */
+        if (!is_power_of_2(rss_rings))
+                return -EINVAL;
+
+        mutex_lock(&mdev->state_lock);
+        if (priv->port_up) {
+                port_up = 1;
+                mlx4_en_stop_port(dev);
+        }
+
+        priv->prof->rss_rings = rss_rings;
+
+        if (port_up) {
+                err = mlx4_en_start_port(dev);
+                if (err)
+                        en_err(priv, "Failed starting port\n");
+        }
+
+        mutex_unlock(&mdev->state_lock);
+        return err;
+}
+
+static int mlx4_en_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd,
+                             u32 *rule_locs)
+{
+        struct mlx4_en_priv *priv = netdev_priv(dev);
+        int err = 0;
+
+        switch (cmd->cmd) {
+        case ETHTOOL_GRXRINGS:
+                cmd->data = priv->rx_ring_num;
+                break;
+        default:
+                err = -EOPNOTSUPP;
+                break;
+        }
+
+        return err;
+}
+
 const struct ethtool_ops mlx4_en_ethtool_ops = {
         .get_drvinfo = mlx4_en_get_drvinfo,
         .get_settings = mlx4_en_get_settings,
@@ -498,6 +587,10 @@ const struct ethtool_ops mlx4_en_ethtool_ops = {
         .set_pauseparam = mlx4_en_set_pauseparam,
         .get_ringparam = mlx4_en_get_ringparam,
         .set_ringparam = mlx4_en_set_ringparam,
+        .get_rxnfc = mlx4_en_get_rxnfc,
+        .get_rxfh_indir_size = mlx4_en_get_rxfh_indir_size,
+        .get_rxfh_indir = mlx4_en_get_rxfh_indir,
+        .set_rxfh_indir = mlx4_en_set_rxfh_indir,
 };
 
 
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c
index a06096fcc0b8..2097a7d3c5b8 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c
@@ -62,10 +62,6 @@ static const char mlx4_en_version[] =
  * Device scope module parameters
  */
 
-
-/* Enable RSS TCP traffic */
-MLX4_EN_PARM_INT(tcp_rss, 1,
-                 "Enable RSS for incomming TCP traffic or disabled (0)");
 /* Enable RSS UDP traffic */
 MLX4_EN_PARM_INT(udp_rss, 1,
                  "Enable RSS for incomming UDP traffic or disabled (0)");
@@ -104,7 +100,6 @@ static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
         struct mlx4_en_profile *params = &mdev->profile;
         int i;
 
-        params->tcp_rss = tcp_rss;
         params->udp_rss = udp_rss;
         if (params->udp_rss && !(mdev->dev->caps.flags
                                         & MLX4_DEV_CAP_FLAG_UDP_RSS)) {
@@ -120,6 +115,7 @@ static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
                 params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
                 params->prof[i].tx_ring_num = MLX4_EN_NUM_TX_RINGS +
                         (!!pfcrx) * MLX4_EN_NUM_PPP_RINGS;
+                params->prof[i].rss_rings = 0;
         }
 
         return 0;
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
index e8d6ad2dce0a..971d4b6b8dfe 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c
@@ -853,6 +853,7 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
         struct mlx4_en_rss_map *rss_map = &priv->rss_map;
         struct mlx4_qp_context context;
         struct mlx4_rss_context *rss_context;
+        int rss_rings;
         void *ptr;
         u8 rss_mask = (MLX4_RSS_IPV4 | MLX4_RSS_TCP_IPV4 | MLX4_RSS_IPV6 |
                         MLX4_RSS_TCP_IPV6);
@@ -893,10 +894,15 @@ int mlx4_en_config_rss_steer(struct mlx4_en_priv *priv)
         mlx4_en_fill_qp_context(priv, 0, 0, 0, 1, priv->base_qpn,
                                 priv->rx_ring[0].cqn, &context);
 
+        if (!priv->prof->rss_rings || priv->prof->rss_rings > priv->rx_ring_num)
+                rss_rings = priv->rx_ring_num;
+        else
+                rss_rings = priv->prof->rss_rings;
+
         ptr = ((void *) &context) + offsetof(struct mlx4_qp_context, pri_path)
                                         + MLX4_RSS_OFFSET_IN_QPC_PRI_PATH;
         rss_context = ptr;
-        rss_context->base_qpn = cpu_to_be32(ilog2(priv->rx_ring_num) << 24 |
+        rss_context->base_qpn = cpu_to_be32(ilog2(rss_rings) << 24 |
                                             (rss_map->base_qpn));
         rss_context->default_qpn = cpu_to_be32(rss_map->base_qpn);
         if (priv->mdev->profile.udp_rss) {
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index f2a8e65f5f88..f4d189a1290e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -325,11 +325,11 @@ struct mlx4_en_port_profile {
         u8 rx_ppp;
         u8 tx_pause;
         u8 tx_ppp;
+        int rss_rings;
 };
 
 struct mlx4_en_profile {
         int rss_xor;
-        int tcp_rss;
         int udp_rss;
         u8 rss_mask;
         u32 active_ports;