net/mlx5e: Reduce memory consumption on kdump kernel

Reduce memory consumption on kdump kernel by decreasing the number of
channels to 1 and the size of RQs and SQs to the minimal values.

Signed-off-by: Kamal Heib <kamalh@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en.h b/drivers/net/ethernet/mellanox/mlx5/core/en.h
index d603a30..8d660a0 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en.h
@@ -101,6 +101,7 @@
 
 #define MLX5E_LOG_INDIR_RQT_SIZE       0x7
 #define MLX5E_INDIR_RQT_SIZE           BIT(MLX5E_LOG_INDIR_RQT_SIZE)
+#define MLX5E_MIN_NUM_CHANNELS         0x1
 #define MLX5E_MAX_NUM_CHANNELS         (MLX5E_INDIR_RQT_SIZE >> 1)
 #define MLX5E_MAX_NUM_SQS              (MLX5E_MAX_NUM_CHANNELS * MLX5E_MAX_NUM_TC)
 #define MLX5E_TX_CQ_POLL_BUDGET        128
@@ -847,12 +848,6 @@ static inline u32 mlx5e_get_wqe_mtt_offset(struct mlx5e_rq *rq, u16 wqe_ix)
        return wqe_ix * ALIGN(MLX5_MPWRQ_PAGES_PER_WQE, 8);
 }
 
-static inline int mlx5e_get_max_num_channels(struct mlx5_core_dev *mdev)
-{
-       return min_t(int, mdev->priv.eq_table.num_comp_vectors,
-                    MLX5E_MAX_NUM_CHANNELS);
-}
-
 extern const struct ethtool_ops mlx5e_ethtool_ops;
 #ifdef CONFIG_MLX5_CORE_EN_DCB
 extern const struct dcbnl_rtnl_ops mlx5e_dcbnl_ops;

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
index 4021863..9d520f8 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c
@@ -552,7 +552,7 @@ static void mlx5e_get_channels(struct net_device *dev,
 {
        struct mlx5e_priv *priv = netdev_priv(dev);
 
-       ch->max_combined   = mlx5e_get_max_num_channels(priv->mdev);
+       ch->max_combined   = priv->profile->max_nch(priv->mdev);
        ch->combined_count = priv->params.num_channels;
 }
 
@@ -560,7 +560,7 @@ static int mlx5e_set_channels(struct net_device *dev,
                              struct ethtool_channels *ch)
 {
        struct mlx5e_priv *priv = netdev_priv(dev);
-       int ncv = mlx5e_get_max_num_channels(priv->mdev);
+       int ncv = priv->profile->max_nch(priv->mdev);
        unsigned int count = ch->combined_count;
        bool arfs_enabled;
        bool was_opened;

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 6363728..e829143 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -31,6 +31,7 @@
  */
 
 #include <net/tc_act/tc_gact.h>
+#include <linux/crash_dump.h>
 #include <net/pkt_cls.h>
 #include <linux/mlx5/fs.h>
 #include <net/vxlan.h>
@@ -83,7 +84,9 @@ static void mlx5e_set_rq_type_params(struct mlx5e_priv *priv, u8 rq_type)
        priv->params.rq_wq_type = rq_type;
        switch (priv->params.rq_wq_type) {
        case MLX5_WQ_TYPE_LINKED_LIST_STRIDING_RQ:
-               priv->params.log_rq_size = MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE_MPW;
+               priv->params.log_rq_size = is_kdump_kernel() ?
+                       MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE_MPW :
+                       MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE_MPW;
                priv->params.mpwqe_log_stride_sz =
                        MLX5E_GET_PFLAG(priv, MLX5E_PFLAG_RX_CQE_COMPRESS) ?
                        MLX5_MPWRQ_LOG_STRIDE_SIZE_CQE_COMPRESS :
@@ -92,7 +95,9 @@ static void mlx5e_set_rq_type_params(struct mlx5e_priv *priv, u8 rq_type)
                        priv->params.mpwqe_log_stride_sz;
                break;
        default: /* MLX5_WQ_TYPE_LINKED_LIST */
-               priv->params.log_rq_size = MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE;
+               priv->params.log_rq_size = is_kdump_kernel() ?
+                       MLX5E_PARAMS_MINIMUM_LOG_RQ_SIZE :
+                       MLX5E_PARAMS_DEFAULT_LOG_RQ_SIZE;
        }
        priv->params.min_rx_wqes = mlx5_min_rx_wqes(priv->params.rq_wq_type,
                                               BIT(priv->params.log_rq_size));
@@ -1508,6 +1513,14 @@ static int mlx5e_set_tx_maxrate(struct net_device *dev, int index, u32 rate)
        return err;
 }
 
+static inline int mlx5e_get_max_num_channels(struct mlx5_core_dev *mdev)
+{
+       return is_kdump_kernel() ?
+               MLX5E_MIN_NUM_CHANNELS :
+               min_t(int, mdev->priv.eq_table.num_comp_vectors,
+                     MLX5E_MAX_NUM_CHANNELS);
+}
+
 static int mlx5e_open_channel(struct mlx5e_priv *priv, int ix,
                              struct mlx5e_channel_param *cparam,
                              struct mlx5e_channel **cp)
@@ -3491,7 +3504,9 @@ static void mlx5e_build_nic_netdev_priv(struct mlx5_core_dev *mdev,
        priv->params.lro_timeout =
                mlx5e_choose_lro_timeout(mdev, MLX5E_DEFAULT_LRO_TIMEOUT);
 
-       priv->params.log_sq_size = MLX5E_PARAMS_DEFAULT_LOG_SQ_SIZE;
+       priv->params.log_sq_size = is_kdump_kernel() ?
+               MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE :
+               MLX5E_PARAMS_DEFAULT_LOG_SQ_SIZE;
 
        /* set CQE compression */
        priv->params.rx_cqe_compress_def = false;