Subject: [PATCH mlx5-next v2 1/6] net/mlx5: Refactor HCA capability set flow

From: Leon Romanovsky <[email-masked]>
Date: Mon, 13 Apr 2020 16:36:58 +0300

From: Leon Romanovsky <[email-masked]>

Reduce the amount of kzalloc/kfree cycles by allocating
command structure in the parent function and leverage the
knowledge that set_caps() is called for HCA capabilities
only with specific HW structure as parameter to calculate
mailbox size.

Signed-off-by: Leon Romanovsky <[email-masked]>
---
 .../net/ethernet/mellanox/mlx5/core/main.c    | 66 +++++++------------
 1 file changed, 24 insertions(+), 42 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 7af4210c1b96..8b9182add689 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -407,20 +407,19 @@ int mlx5_core_get_caps(struct mlx5_core_dev *dev, enum mlx5_cap_type cap_type)
 	return mlx5_core_get_caps_mode(dev, cap_type, HCA_CAP_OPMOD_GET_MAX);
 }
 
-static int set_caps(struct mlx5_core_dev *dev, void *in, int in_sz, int opmod)
+static int set_caps(struct mlx5_core_dev *dev, void *in, int opmod)
 {
-	u32 out[MLX5_ST_SZ_DW(set_hca_cap_out)] = {0};
+	u32 out[MLX5_ST_SZ_DW(set_hca_cap_out)] = {};
 
 	MLX5_SET(set_hca_cap_in, in, opcode, MLX5_CMD_OP_SET_HCA_CAP);
 	MLX5_SET(set_hca_cap_in, in, op_mod, opmod << 1);
-	return mlx5_cmd_exec(dev, in, in_sz, out, sizeof(out));
+	return mlx5_cmd_exec(dev, in, MLX5_ST_SZ_BYTES(set_hca_cap_in), out,
+			     sizeof(out));
 }
 
-static int handle_hca_cap_atomic(struct mlx5_core_dev *dev)
+static int handle_hca_cap_atomic(struct mlx5_core_dev *dev, void *set_ctx)
 {
-	void *set_ctx;
 	void *set_hca_cap;
-	int set_sz = MLX5_ST_SZ_BYTES(set_hca_cap_in);
 	int req_endianness;
 	int err;
 
@@ -439,27 +438,19 @@ static int handle_hca_cap_atomic(struct mlx5_core_dev *dev)
 	if (req_endianness != MLX5_ATOMIC_REQ_MODE_HOST_ENDIANNESS)
 		return 0;
 
-	set_ctx = kzalloc(set_sz, GFP_KERNEL);
-	if (!set_ctx)
-		return -ENOMEM;
-
 	set_hca_cap = MLX5_ADDR_OF(set_hca_cap_in, set_ctx, capability);
 
 	/* Set requestor to host endianness */
 	MLX5_SET(atomic_caps, set_hca_cap, atomic_req_8B_endianness_mode,
 		 MLX5_ATOMIC_REQ_MODE_HOST_ENDIANNESS);
 
-	err = set_caps(dev, set_ctx, set_sz, MLX5_SET_HCA_CAP_OP_MOD_ATOMIC);
-
-	kfree(set_ctx);
+	err = set_caps(dev, set_ctx, MLX5_SET_HCA_CAP_OP_MOD_ATOMIC);
 	return err;
 }
 
-static int handle_hca_cap_odp(struct mlx5_core_dev *dev)
+static int handle_hca_cap_odp(struct mlx5_core_dev *dev, void *set_ctx)
 {
 	void *set_hca_cap;
-	void *set_ctx;
-	int set_sz;
 	bool do_set = false;
 	int err;
 
@@ -471,11 +462,6 @@ static int handle_hca_cap_odp(struct mlx5_core_dev *dev)
 	if (err)
 		return err;
 
-	set_sz = MLX5_ST_SZ_BYTES(set_hca_cap_in);
-	set_ctx = kzalloc(set_sz, GFP_KERNEL);
-	if (!set_ctx)
-		return -ENOMEM;
-
 	set_hca_cap = MLX5_ADDR_OF(set_hca_cap_in, set_ctx, capability);
 	memcpy(set_hca_cap, dev->caps.hca_cur[MLX5_CAP_ODP],
 	       MLX5_ST_SZ_BYTES(odp_cap));
@@ -505,29 +491,20 @@ static int handle_hca_cap_odp(struct mlx5_core_dev *dev)
 	ODP_CAP_SET_MAX(dev, dc_odp_caps.atomic);
 
 	if (do_set)
-		err = set_caps(dev, set_ctx, set_sz,
-			       MLX5_SET_HCA_CAP_OP_MOD_ODP);
-
-	kfree(set_ctx);
+		err = set_caps(dev, set_ctx, MLX5_SET_HCA_CAP_OP_MOD_ODP);
 
 	return err;
 }
 
-static int handle_hca_cap(struct mlx5_core_dev *dev)
+static int handle_hca_cap(struct mlx5_core_dev *dev, void *set_ctx)
 {
-	void *set_ctx = NULL;
 	struct mlx5_profile *prof = dev->profile;
-	int err = -ENOMEM;
-	int set_sz = MLX5_ST_SZ_BYTES(set_hca_cap_in);
 	void *set_hca_cap;
-
-	set_ctx = kzalloc(set_sz, GFP_KERNEL);
-	if (!set_ctx)
-		goto query_ex;
+	int err;
 
 	err = mlx5_core_get_caps(dev, MLX5_CAP_GENERAL);
 	if (err)
-		goto query_ex;
+		return err;
 
 	set_hca_cap = MLX5_ADDR_OF(set_hca_cap_in, set_ctx,
 				   capability);
@@ -578,37 +555,42 @@ static int handle_hca_cap(struct mlx5_core_dev *dev)
 			 num_vhca_ports,
 			 MLX5_CAP_GEN_MAX(dev, num_vhca_ports));
 
-	err = set_caps(dev, set_ctx, set_sz,
-		       MLX5_SET_HCA_CAP_OP_MOD_GENERAL_DEVICE);
-
-query_ex:
-	kfree(set_ctx);
+	err = set_caps(dev, set_ctx, MLX5_SET_HCA_CAP_OP_MOD_GENERAL_DEVICE);
 	return err;
 }
 
 static int set_hca_cap(struct mlx5_core_dev *dev)
 {
+	int set_sz = MLX5_ST_SZ_BYTES(set_hca_cap_in);
+	void *set_ctx;
 	int err;
 
-	err = handle_hca_cap(dev);
+	set_ctx = kzalloc(set_sz, GFP_KERNEL);
+	if (!set_ctx)
+		return -ENOMEM;
+
+	err = handle_hca_cap(dev, set_ctx);
 	if (err) {
 		mlx5_core_err(dev, "handle_hca_cap failed\n");
 		goto out;
 	}
 
-	err = handle_hca_cap_atomic(dev);
+	memset(set_ctx, 0, set_sz);
+	err = handle_hca_cap_atomic(dev, set_ctx);
 	if (err) {
 		mlx5_core_err(dev, "handle_hca_cap_atomic failed\n");
 		goto out;
 	}
 
-	err = handle_hca_cap_odp(dev);
+	memset(set_ctx, 0, set_sz);
+	err = handle_hca_cap_odp(dev, set_ctx);
 	if (err) {
 		mlx5_core_err(dev, "handle_hca_cap_odp failed\n");
 		goto out;
 	}
 
 out:
+	kfree(set_ctx);
 	return err;
 }
 
-- 
2.25.2