net/mlx5e: Create Advanced Steering Operation object for IPsec

Setup the ASO (Advanced Steering Operation) object that is needed
for IPsec to interact with SW stack about various fast changing
events: replay window, lifetime limits,  e.t.c

Reviewed-by: Raed Salem <raeds@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

drivers/net/ethernet/mellanox/mlx5/core/en.h

@@ -1245,4 +1245,5 @@ int mlx5e_set_vf_rate(struct net_device *dev, int vf, int min_tx_rate, int max_t
 int mlx5e_get_vf_config(struct net_device *dev, int vf, struct ifla_vf_info *ivi);
 int mlx5e_get_vf_stats(struct net_device *dev, int vf, struct ifla_vf_stats *vf_stats);
 #endif
+int mlx5e_create_mkey(struct mlx5_core_dev *mdev, u32 pdn, u32 *mkey);
 #endif /* __MLX5_EN_H__ */

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c

@@ -373,6 +373,13 @@ void mlx5e_ipsec_init(struct mlx5e_priv *priv)
 	if (!ipsec->wq)
 		goto err_wq;
 
+	if (mlx5_ipsec_device_caps(priv->mdev) &
+	    MLX5_IPSEC_CAP_PACKET_OFFLOAD) {
+		ret = mlx5e_ipsec_aso_init(ipsec);
+		if (ret)
+			goto err_aso;
+	}
+
 	ret = mlx5e_accel_ipsec_fs_init(ipsec);
 	if (ret)
 		goto err_fs_init;
@@ -383,6 +390,9 @@ void mlx5e_ipsec_init(struct mlx5e_priv *priv)
 	return;
 
 err_fs_init:
+	if (mlx5_ipsec_device_caps(priv->mdev) & MLX5_IPSEC_CAP_PACKET_OFFLOAD)
+		mlx5e_ipsec_aso_cleanup(ipsec);
+err_aso:
 	destroy_workqueue(ipsec->wq);
 err_wq:
 	kfree(ipsec);
@@ -398,6 +408,8 @@ void mlx5e_ipsec_cleanup(struct mlx5e_priv *priv)
 		return;
 
 	mlx5e_accel_ipsec_fs_cleanup(ipsec);
+	if (mlx5_ipsec_device_caps(priv->mdev) & MLX5_IPSEC_CAP_PACKET_OFFLOAD)
+		mlx5e_ipsec_aso_cleanup(ipsec);
 	destroy_workqueue(ipsec->wq);
 	kfree(ipsec);
 	priv->ipsec = NULL;

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h

@@ -39,6 +39,7 @@
 #include <linux/mlx5/device.h>
 #include <net/xfrm.h>
 #include <linux/idr.h>
+#include "lib/aso.h"
 
 #define MLX5E_IPSEC_SADB_RX_BITS 10
 #define MLX5E_IPSEC_ESN_SCOPE_MID 0x80000000L
@@ -97,6 +98,14 @@ struct mlx5e_ipsec_sw_stats {
 struct mlx5e_ipsec_rx;
 struct mlx5e_ipsec_tx;
 
+struct mlx5e_ipsec_aso {
+	u8 ctx[MLX5_ST_SZ_BYTES(ipsec_aso)];
+	dma_addr_t dma_addr;
+	struct mlx5_aso *aso;
+	u32 pdn;
+	u32 mkey;
+};
+
 struct mlx5e_ipsec {
 	struct mlx5_core_dev *mdev;
 	DECLARE_HASHTABLE(sadb_rx, MLX5E_IPSEC_SADB_RX_BITS);
@@ -107,6 +116,7 @@ struct mlx5e_ipsec {
 	struct mlx5e_ipsec_rx *rx_ipv4;
 	struct mlx5e_ipsec_rx *rx_ipv6;
 	struct mlx5e_ipsec_tx *tx;
+	struct mlx5e_ipsec_aso *aso;
 };
 
 struct mlx5e_ipsec_esn_state {
@@ -160,6 +170,9 @@ u32 mlx5_ipsec_device_caps(struct mlx5_core_dev *mdev);
 void mlx5_accel_esp_modify_xfrm(struct mlx5e_ipsec_sa_entry *sa_entry,
 				const struct mlx5_accel_esp_xfrm_attrs *attrs);
 
+int mlx5e_ipsec_aso_init(struct mlx5e_ipsec *ipsec);
+void mlx5e_ipsec_aso_cleanup(struct mlx5e_ipsec *ipsec);
+
 static inline struct mlx5_core_dev *
 mlx5e_ipsec_sa2dev(struct mlx5e_ipsec_sa_entry *sa_entry)
 {

drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c

@@ -2,6 +2,7 @@
 /* Copyright (c) 2017, Mellanox Technologies inc. All rights reserved. */
 
 #include "mlx5_core.h"
+#include "en.h"
 #include "ipsec.h"
 #include "lib/mlx5.h"
 
@@ -207,3 +208,56 @@ void mlx5_accel_esp_modify_xfrm(struct mlx5e_ipsec_sa_entry *sa_entry,
 
 	memcpy(&sa_entry->attrs, attrs, sizeof(sa_entry->attrs));
 }
+
+int mlx5e_ipsec_aso_init(struct mlx5e_ipsec *ipsec)
+{
+	struct mlx5_core_dev *mdev = ipsec->mdev;
+	struct mlx5e_ipsec_aso *aso;
+	struct mlx5e_hw_objs *res;
+	struct device *pdev;
+	int err;
+
+	aso = kzalloc(sizeof(*ipsec->aso), GFP_KERNEL);
+	if (!aso)
+		return -ENOMEM;
+
+	res = &mdev->mlx5e_res.hw_objs;
+
+	pdev = mlx5_core_dma_dev(mdev);
+	aso->dma_addr = dma_map_single(pdev, aso->ctx, sizeof(aso->ctx),
+				       DMA_BIDIRECTIONAL);
+	err = dma_mapping_error(pdev, aso->dma_addr);
+	if (err)
+		goto err_dma;
+
+	aso->aso = mlx5_aso_create(mdev, res->pdn);
+	if (IS_ERR(aso->aso)) {
+		err = PTR_ERR(aso->aso);
+		goto err_aso_create;
+	}
+
+	ipsec->aso = aso;
+	return 0;
+
+err_aso_create:
+	dma_unmap_single(pdev, aso->dma_addr, sizeof(aso->ctx),
+			 DMA_BIDIRECTIONAL);
+err_dma:
+	kfree(aso);
+	return err;
+}
+
+void mlx5e_ipsec_aso_cleanup(struct mlx5e_ipsec *ipsec)
+{
+	struct mlx5_core_dev *mdev = ipsec->mdev;
+	struct mlx5e_ipsec_aso *aso;
+	struct device *pdev;
+
+	aso = ipsec->aso;
+	pdev = mlx5_core_dma_dev(mdev);
+
+	mlx5_aso_destroy(aso->aso);
+	dma_unmap_single(pdev, aso->dma_addr, sizeof(aso->ctx),
+			 DMA_BIDIRECTIONAL);
+	kfree(aso);
+}