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| author | Amir Vadai <amirv@mellanox.com> | 2012-07-18 22:33:52 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-07-19 08:34:37 -0700 |
| commit | 1eb8c695bda92ccaec30e9a3351e37a1896da54f (patch) | |
| tree | a5c73ef50598f37bc3bdead53425dcedb7ae9bca /drivers/net/ethernet/mellanox/mlx4/en_cq.c | |
| parent | d9236c3f10490cd0b3fd4516af12ba62dcbae0b0 (diff) | |
| download | talos-obmc-linux-1eb8c695bda92ccaec30e9a3351e37a1896da54f.tar.gz talos-obmc-linux-1eb8c695bda92ccaec30e9a3351e37a1896da54f.zip | |
net/mlx4_en: Add accelerated RFS support
Use RFS infrastructure and flow steering in HW to keep CPU
affinity of rx interrupts and application per TCP stream.
A flow steering filter is added to the HW whenever the RFS
ndo callback is invoked by core networking code.
Because the invocation takes place in interrupt context, the
actual setup of HW is done using workqueue. Whenever new filter
is added, the driver checks for expiry of existing filters.
Since there's window in time between the point where the core
RFS code invoked the ndo callback, to the point where the HW
is configured from the workqueue context, the 2nd, 3rd etc
packets from that stream will cause the net core to invoke
the callback again and again.
To prevent inefficient/double configuration of the HW, the filters
are kept in a database which is indexed using hash function to enable
fast access.
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/en_cq.c')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/en_cq.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_cq.c b/drivers/net/ethernet/mellanox/mlx4/en_cq.c index 0ef615684021..aa9c2f6cf3c0 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_cq.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_cq.c @@ -77,6 +77,12 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq, struct mlx4_en_dev *mdev = priv->mdev; int err = 0; char name[25]; + struct cpu_rmap *rmap = +#ifdef CONFIG_RFS_ACCEL + priv->dev->rx_cpu_rmap; +#else + NULL; +#endif cq->dev = mdev->pndev[priv->port]; cq->mcq.set_ci_db = cq->wqres.db.db; @@ -91,7 +97,7 @@ int mlx4_en_activate_cq(struct mlx4_en_priv *priv, struct mlx4_en_cq *cq, sprintf(name, "%s-%d", priv->dev->name, cq->ring); /* Set IRQ for specific name (per ring) */ - if (mlx4_assign_eq(mdev->dev, name, NULL, + if (mlx4_assign_eq(mdev->dev, name, rmap, &cq->vector)) { cq->vector = (cq->ring + 1 + priv->port) % mdev->dev->caps.num_comp_vectors; |
