net/mlx4_en: Use minimal rx and tx ring sizes on kdump kernel

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 <alaa@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlx4/en_main.c b/drivers/net/ethernet/mellanox/mlx4/en_main.c
index d25e16d2c3191ecff8ed758353203de5f7dc9c07..109472d6b61f1948ce257e9504cc2fa2d4f1146b 100644 (file)
--- 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 c3228b89df463597de1cb546754ea1b8aa4d876d..485d856546c6c3b83cacdcbe6376d73862dd0f8a 100644 (file)
--- 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)