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authorEric Dumazet <edumazet@google.com>2014-10-05 13:35:11 +0400
committerDavid S. Miller <davem@davemloft.net>2014-10-06 09:04:15 +0400
commit6a4e81211f475561ed87c613216f981fbef8b7fc (patch)
treeced59807448f488d408e5fe28a89b563357676bb /drivers
parent98b1634941e3efb0334f794efc79702839993d86 (diff)
downloadlinux-6a4e81211f475561ed87c613216f981fbef8b7fc.tar.xz
net/mlx4_en: Avoid calling bswap in tx fast path
- doorbell_qpn is stored in the cpu_to_be32() way to avoid bswap() in fast path. - mdev->mr.key stored in ring->mr_key to also avoid bswap() and access to cold cache line. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Amir Vadai <amirv@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/en_tx.c17
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/mlx4_en.h3
2 files changed, 12 insertions, 8 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index eaf23eb7266a..322cda32ef80 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -195,7 +195,8 @@ int mlx4_en_activate_tx_ring(struct mlx4_en_priv *priv,
memset(ring->buf, 0, ring->buf_size);
ring->qp_state = MLX4_QP_STATE_RST;
- ring->doorbell_qpn = ring->qp.qpn << 8;
+ ring->doorbell_qpn = cpu_to_be32(ring->qp.qpn << 8);
+ ring->mr_key = cpu_to_be32(mdev->mr.key);
mlx4_en_fill_qp_context(priv, ring->size, ring->stride, 1, 0, ring->qpn,
ring->cqn, user_prio, &ring->context);
@@ -654,7 +655,6 @@ static void mlx4_bf_copy(void __iomem *dst, const void *src,
netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mlx4_en_priv *priv = netdev_priv(dev);
- struct mlx4_en_dev *mdev = priv->mdev;
struct device *ddev = priv->ddev;
struct mlx4_en_tx_ring *ring;
struct mlx4_en_tx_desc *tx_desc;
@@ -769,7 +769,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_drop_unmap;
data->addr = cpu_to_be64(dma);
- data->lkey = cpu_to_be32(mdev->mr.key);
+ data->lkey = ring->mr_key;
wmb();
data->byte_count = cpu_to_be32(skb_frag_size(frag));
--data;
@@ -787,7 +787,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_drop_unmap;
data->addr = cpu_to_be64(dma);
- data->lkey = cpu_to_be32(mdev->mr.key);
+ data->lkey = ring->mr_key;
wmb();
data->byte_count = cpu_to_be32(byte_count);
}
@@ -879,9 +879,12 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
send_doorbell = !skb->xmit_more || netif_xmit_stopped(ring->tx_queue);
+ real_size = (real_size / 16) & 0x3f;
+
if (ring->bf_enabled && desc_size <= MAX_BF && !bounce &&
!vlan_tx_tag_present(skb) && send_doorbell) {
- tx_desc->ctrl.bf_qpn |= cpu_to_be32(ring->doorbell_qpn);
+ tx_desc->ctrl.bf_qpn = ring->doorbell_qpn |
+ cpu_to_be32(real_size);
op_own |= htonl((bf_index & 0xffff) << 8);
/* Ensure new descriptor hits memory
@@ -911,8 +914,8 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
tx_desc->ctrl.owner_opcode = op_own;
if (send_doorbell) {
wmb();
- iowrite32be(ring->doorbell_qpn,
- ring->bf.uar->map + MLX4_SEND_DOORBELL);
+ iowrite32(ring->doorbell_qpn,
+ ring->bf.uar->map + MLX4_SEND_DOORBELL);
} else {
ring->xmit_more++;
}
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index b7bde95e05fe..ab34461e628c 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -279,7 +279,8 @@ struct mlx4_en_tx_ring {
u16 stride;
u16 cqn; /* index of port CQ associated with this ring */
u32 buf_size;
- u32 doorbell_qpn;
+ __be32 doorbell_qpn;
+ __be32 mr_key;
void *buf;
struct mlx4_en_tx_info *tx_info;
u8 *bounce_buf;