From ea1c1af1396cac9f8a1160acdac17f80e4b4f2c4 Mon Sep 17 00:00:00 2001 From: Amir Vadai Date: Tue, 22 Jul 2014 15:44:12 +0300 Subject: [PATCH] net/mlx4_en: Reduce memory consumption on kdump kernel When memory is limited, reduce number of rx and tx rings. Signed-off-by: Amir Vadai Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx4/en_main.c | 6 ++++-- drivers/net/ethernet/mellanox/mlx4/en_rx.c | 5 +++-- drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 1 + 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c index f953c1d7eae6..3626fdf4cb5d 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_main.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c @@ -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"); diff --git a/drivers/net/ethernet/mellanox/mlx4/en_rx.c b/drivers/net/ethernet/mellanox/mlx4/en_rx.c index 7765a08f9e84..9c909d23f14c 100644 --- a/drivers/net/ethernet/mellanox/mlx4/en_rx.c +++ b/drivers/net/ethernet/mellanox/mlx4/en_rx.c @@ -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); } diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h index 54c277412e42..3de41be49425 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h @@ -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 -- 2.20.1