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authorInbar Karmy <inbark@mellanox.com>2017-06-29 14:07:57 +0300
committerDavid S. Miller <davem@davemloft.net>2017-06-29 22:56:15 +0300
commitec327f7a4340b635d89ca9667935adefa3905be1 (patch)
treefa4aa104d6024cbc634b9a87ea00d7015dc5c9d2 /drivers/net/ethernet/mellanox/mlx4/en_main.c
parentf21ad61424f7c623eddbcf54425a86afb68ca55f (diff)
downloadlinux-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/en_main.c')
-rw-r--r--drivers/net/ethernet/mellanox/mlx4/en_main.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c
index a8eb856b0158..2b0cbca4beb5 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c
@@ -169,7 +169,8 @@ static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
params->prof[i].tx_ppp = pfctx;
params->prof[i].tx_ring_size = MLX4_EN_DEF_TX_RING_SIZE;
params->prof[i].rx_ring_size = MLX4_EN_DEF_RX_RING_SIZE;
- params->prof[i].num_up = MLX4_EN_NUM_UP_HIGH;
+ params->prof[i].num_up = MLX4_EN_NUM_UP_LOW;
+ params->prof[i].num_tx_rings_p_up = params->num_tx_rings_p_up;
params->prof[i].tx_ring_num[TX] = params->num_tx_rings_p_up *
params->prof[i].num_up;
params->prof[i].rss_rings = 0;