Function mlx4_en_tx_write_desc() is not optimized to use of XDP xmit. Use the relevant parts inline instead.
Signed-off-by: Tariq Toukan <[email protected]> --- drivers/net/ethernet/mellanox/mlx4/en_tx.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c index f16774c9c347..ac7254e3f909 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c @@ -1090,7 +1090,9 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring, struct mlx4_en_priv *priv, unsigned int length, int tx_ind, bool *doorbell_pending) { - union mlx4_wqe_qpn_vlan qpn_vlan = {}; + union mlx4_wqe_qpn_vlan qpn_vlan = { + .fence_size = MLX4_EN_XDP_TX_REAL_SZ, + }; struct mlx4_en_tx_desc *tx_desc; struct mlx4_en_tx_info *tx_info; struct mlx4_wqe_data_seg *data; @@ -1140,7 +1142,6 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring, data->byte_count = cpu_to_be32(length); /* tx completion can avoid cache line miss for common cases */ - tx_desc->ctrl.srcrb_flags = priv->ctrl_flags; op_own = cpu_to_be32(MLX4_OPCODE_SEND) | ((ring->prod & ring->size) ? @@ -1151,10 +1152,16 @@ netdev_tx_t mlx4_en_xmit_frame(struct mlx4_en_rx_ring *rx_ring, ring->prod += MLX4_EN_XDP_TX_NRTXBB; - qpn_vlan.fence_size = MLX4_EN_XDP_TX_REAL_SZ; + tx_desc->ctrl.qpn_vlan = qpn_vlan; + tx_desc->ctrl.srcrb_flags = priv->ctrl_flags; + + /* Ensure new descriptor hits memory + * before setting ownership of this descriptor to HW + */ + dma_wmb(); + tx_desc->ctrl.owner_opcode = op_own; + ring->xmit_more++; - mlx4_en_tx_write_desc(ring, tx_desc, qpn_vlan, TXBB_SIZE, 0, - op_own, false, false); *doorbell_pending = true; return NETDEV_TX_OK; -- 1.8.3.1
