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Commit ea1c1af1 authored by Amir Vadai's avatar Amir Vadai Committed by David S. Miller
Browse files

net/mlx4_en: Reduce memory consumption on kdump kernel 



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

Signed-off-by: default avatarAmir Vadai <amirv@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2599d858

drivers/net/ethernet/mellanox/mlx4/en_main.c

+4 −2
Original line number Diff line number Diff line
@@ -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");

drivers/net/ethernet/mellanox/mlx4/en_rx.c

+3 −2
Original line number Diff line number Diff line
@@ -335,7 +335,8 @@ 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,

		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);

drivers/net/ethernet/mellanox/mlx4/mlx4_en.h

+1 −0
Original line number Diff line number Diff line
@@ -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