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net/mlx4_en: Reduce memory consumption on kdump kernel

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When memory is limited, reduce number of rx and tx rings.

Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amir Vadai 2014-07-22 15:44:12 +03:00 committed by David S. Miller
parent 2599d8580f
commit ea1c1af139
3 changed files with 8 additions and 4 deletions
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6
drivers/net/ethernet/mellanox/mlx4/en_main.c
View File

@ -129,8 +129,10 @@ static int mlx4_en_get_profile(struct mlx4_en_dev *mdev)
int i;
params->udp_rss = udp_rss;
params->num_tx_rings_p_up = min_t(int, num_online_cpus(),
MLX4_EN_MAX_TX_RING_P_UP);
params->num_tx_rings_p_up = mlx4_low_memory_profile() ?
MLX4_EN_MIN_TX_RING_P_UP :
min_t(int, num_online_cpus(), MLX4_EN_MAX_TX_RING_P_UP);
if (params->udp_rss && !(mdev->dev->caps.flags
& MLX4_DEV_CAP_FLAG_UDP_RSS)) {
mlx4_warn(mdev, "UDP RSS is not supported on this device\n");

5
drivers/net/ethernet/mellanox/mlx4/en_rx.c
View File

@ -335,8 +335,9 @@ void mlx4_en_set_num_rx_rings(struct mlx4_en_dev *mdev)
dev->caps.comp_pool/
dev->caps.num_ports) - 1;
num_rx_rings = min_t(int, num_of_eqs,
netif_get_num_default_rss_queues());
num_rx_rings = mlx4_low_memory_profile() ? MIN_RX_RINGS :
min_t(int, num_of_eqs,
netif_get_num_default_rss_queues());
mdev->profile.prof[i].rx_ring_num =
rounddown_pow_of_two(num_rx_rings);
}

1
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
View File

@ -121,6 +121,7 @@ enum {
#define MLX4_EN_MIN_TX_SIZE (4096 / TXBB_SIZE)
#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 8
#define MLX4_EN_DEF_TX_RING_SIZE 512