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| author | Inbar Karmy <inbark@mellanox.com> | 2017-06-29 14:07:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-29 22:56:15 +0300 |
| commit | ec327f7a4340b635d89ca9667935adefa3905be1 (patch) | |
| tree | fa4aa104d6024cbc634b9a87ea00d7015dc5c9d2 /drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | |
| parent | f21ad61424f7c623eddbcf54425a86afb68ca55f (diff) | |
| download | linux-ec327f7a4340b635d89ca9667935adefa3905be1.tar.xz | |
net/mlx4_en: Do not allocate redundant TX queues when TC is disabled
Currently the number of TX queues that are allocated doesn't depend
on the number of TCs, the module always loads with max num of UP
per channel.
In order to prevent the allocation of unnecessary memory, the
module will load with minimum number of UPs per channel, and the
user will be able to control the number of TX queues per channel
by changing the number of TC to 8 using the tc command.
The variable num_up will hold the information about the current
number of UPs.
Due to the change, needed to remove the lines that set the value of
UP to be different than zero in the func "mlx4_en_select_queue",
since now the num of TX queues that are allocated is only one per channel
in default.
In order not to force the UP to be zero in case of only one TC, added
a condition before forcing it in the func "mlx4_en_fill_qp_context".
Tested:
After the module is loaded with minimum number of UP per channel, to
increase num of TCs to 8, use:
tc qdisc add dev ens8 root mqprio num_tc 8
In order to decrease the number of TCs to minimum number of UP per channel,
use:
tc qdisc del dev ens8 root
Signed-off-by: Inbar Karmy <inbark@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Cc: Tarick Bedeir <tarick@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/mellanox/mlx4/mlx4_en.h')
| -rw-r--r-- | drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h index 89885281d489..d350b2158104 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h @@ -115,6 +115,7 @@ #define MLX4_EN_SMALL_PKT_SIZE 64 #define MLX4_EN_MIN_TX_RING_P_UP 1 #define MLX4_EN_MAX_TX_RING_P_UP 32 +#define MLX4_EN_NUM_UP_LOW 1 #define MLX4_EN_NUM_UP_HIGH 8 #define MLX4_EN_DEF_RX_RING_SIZE 1024 #define MLX4_EN_DEF_TX_RING_SIZE MLX4_EN_DEF_RX_RING_SIZE @@ -762,6 +763,7 @@ extern const struct dcbnl_rtnl_ops mlx4_en_dcbnl_pfc_ops; #endif int mlx4_en_setup_tc(struct net_device *dev, u8 up); +int mlx4_en_alloc_tx_queue_per_tc(struct net_device *dev, u8 tc); #ifdef CONFIG_RFS_ACCEL void mlx4_en_cleanup_filters(struct mlx4_en_priv *priv); |