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net/mlx4_en: Ignore budget on TX napi polling
It is recommended that TX work not count against the quota. The cost of TX packet liberation is a minute percentage of what it costs to process an RX frame. Furthermore, that SKB freeing makes memory available for other paths in the stack. Give the TX a larger budget and be more aggressive about cleaning up the Tx descriptors this budget could be changed using ethtool: $ ethtool -C eth1 tx-frames-irq <budget> Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -417,6 +417,8 @@ static int mlx4_en_get_coalesce(struct net_device *dev,
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coal->tx_coalesce_usecs = priv->tx_usecs;
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coal->tx_max_coalesced_frames = priv->tx_frames;
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coal->tx_max_coalesced_frames_irq = priv->tx_work_limit;
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coal->rx_coalesce_usecs = priv->rx_usecs;
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coal->rx_max_coalesced_frames = priv->rx_frames;
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@ -426,6 +428,7 @@ static int mlx4_en_get_coalesce(struct net_device *dev,
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coal->rx_coalesce_usecs_high = priv->rx_usecs_high;
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coal->rate_sample_interval = priv->sample_interval;
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coal->use_adaptive_rx_coalesce = priv->adaptive_rx_coal;
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return 0;
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}
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@ -434,6 +437,9 @@ static int mlx4_en_set_coalesce(struct net_device *dev,
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{
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struct mlx4_en_priv *priv = netdev_priv(dev);
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if (!coal->tx_max_coalesced_frames_irq)
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return -EINVAL;
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priv->rx_frames = (coal->rx_max_coalesced_frames ==
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MLX4_EN_AUTO_CONF) ?
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MLX4_EN_RX_COAL_TARGET :
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@ -457,6 +463,7 @@ static int mlx4_en_set_coalesce(struct net_device *dev,
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priv->rx_usecs_high = coal->rx_coalesce_usecs_high;
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priv->sample_interval = coal->rate_sample_interval;
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priv->adaptive_rx_coal = coal->use_adaptive_rx_coalesce;
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priv->tx_work_limit = coal->tx_max_coalesced_frames_irq;
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return mlx4_en_moderation_update(priv);
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}
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@ -2473,6 +2473,7 @@ int mlx4_en_init_netdev(struct mlx4_en_dev *mdev, int port,
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MLX4_WQE_CTRL_SOLICITED);
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priv->num_tx_rings_p_up = mdev->profile.num_tx_rings_p_up;
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priv->tx_ring_num = prof->tx_ring_num;
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priv->tx_work_limit = MLX4_EN_DEFAULT_TX_WORK;
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priv->tx_ring = kzalloc(sizeof(struct mlx4_en_tx_ring *) * MAX_TX_RINGS,
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GFP_KERNEL);
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@ -351,9 +351,8 @@ int mlx4_en_free_tx_buf(struct net_device *dev, struct mlx4_en_tx_ring *ring)
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return cnt;
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}
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static int mlx4_en_process_tx_cq(struct net_device *dev,
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struct mlx4_en_cq *cq,
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int budget)
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static bool mlx4_en_process_tx_cq(struct net_device *dev,
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struct mlx4_en_cq *cq)
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{
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struct mlx4_en_priv *priv = netdev_priv(dev);
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struct mlx4_cq *mcq = &cq->mcq;
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@ -372,9 +371,10 @@ static int mlx4_en_process_tx_cq(struct net_device *dev,
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int factor = priv->cqe_factor;
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u64 timestamp = 0;
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int done = 0;
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int budget = priv->tx_work_limit;
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if (!priv->port_up)
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return 0;
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return true;
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index = cons_index & size_mask;
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cqe = &buf[(index << factor) + factor];
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@ -447,7 +447,7 @@ static int mlx4_en_process_tx_cq(struct net_device *dev,
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netif_tx_wake_queue(ring->tx_queue);
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ring->wake_queue++;
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}
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return done;
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return done < budget;
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}
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void mlx4_en_tx_irq(struct mlx4_cq *mcq)
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@ -467,18 +467,16 @@ int mlx4_en_poll_tx_cq(struct napi_struct *napi, int budget)
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struct mlx4_en_cq *cq = container_of(napi, struct mlx4_en_cq, napi);
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struct net_device *dev = cq->dev;
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struct mlx4_en_priv *priv = netdev_priv(dev);
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int done;
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int clean_complete;
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done = mlx4_en_process_tx_cq(dev, cq, budget);
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clean_complete = mlx4_en_process_tx_cq(dev, cq);
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if (!clean_complete)
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return budget;
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/* If we used up all the quota - we're probably not done yet... */
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if (done < budget) {
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/* Done for now */
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napi_complete(napi);
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mlx4_en_arm_cq(priv, cq);
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return done;
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}
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return budget;
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napi_complete(napi);
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mlx4_en_arm_cq(priv, cq);
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return 0;
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}
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static struct mlx4_en_tx_desc *mlx4_en_bounce_to_desc(struct mlx4_en_priv *priv,
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@ -126,6 +126,8 @@ enum {
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#define MAX_TX_RINGS (MLX4_EN_MAX_TX_RING_P_UP * \
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MLX4_EN_NUM_UP)
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#define MLX4_EN_DEFAULT_TX_WORK 256
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/* Target number of packets to coalesce with interrupt moderation */
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#define MLX4_EN_RX_COAL_TARGET 44
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#define MLX4_EN_RX_COAL_TIME 0x10
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@ -543,6 +545,7 @@ struct mlx4_en_priv {
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__be32 ctrl_flags;
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u32 flags;
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u8 num_tx_rings_p_up;
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u32 tx_work_limit;
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u32 tx_ring_num;
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u32 rx_ring_num;
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u32 rx_skb_size;
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