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 d25e16d..109472d 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 c3228b8..485d856 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)