[PATCH net-next] net/mlx4_en: Use minimal rx and tx ring sizes on kdump kernel
From: Tariq Toukan <hidden>
Date: 2018-10-09 16:23:06
Subsystem:
mellanox ethernet driver (mlx4_en), mellanox mlx4 core vpi driver, networking drivers, the rest · Maintainers:
Tariq Toukan, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Alaa Hleihel <redacted> When memory is limited (on kdump kernel), reduce size of rx and tx rings. Also reduce the number of rx rings. Signed-off-by: Alaa Hleihel <redacted> Signed-off-by: Tariq Toukan <redacted> --- drivers/net/ethernet/mellanox/mlx4/en_main.c | 9 +++++++-- drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 2 +- 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c
index d25e16d2c319..109472d6b61f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_main.c@@ -167,8 +167,13 @@ static void mlx4_en_get_profile(struct mlx4_en_dev *mdev) params->prof[i].rx_ppp = pfcrx; params->prof[i].tx_pause = !(pfcrx || pfctx); 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; + if (mlx4_low_memory_profile()) { + params->prof[i].tx_ring_size = MLX4_EN_MIN_TX_SIZE; + params->prof[i].rx_ring_size = MLX4_EN_MIN_RX_SIZE; + } else { + 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_LOW; params->prof[i].num_tx_rings_p_up = params->max_num_tx_rings_p_up; params->prof[i].tx_ring_num[TX] = params->max_num_tx_rings_p_up *
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index c3228b89df46..485d856546c6 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h@@ -72,7 +72,7 @@ #define MLX4_EN_PAGE_SIZE (1 << MLX4_EN_PAGE_SHIFT) #define DEF_RX_RINGS 16 #define MAX_RX_RINGS 128 -#define MIN_RX_RINGS 4 +#define MIN_RX_RINGS 1 #define LOG_TXBB_SIZE 6 #define TXBB_SIZE BIT(LOG_TXBB_SIZE) #define HEADROOM (2048 / TXBB_SIZE + 1)
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1.8.3.1