netdev - [PATCH xfrm-next 10/16] net/mlx5e: Create hardware IPsec packet offload objects

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Date:   Fri,  2 Dec 2022 22:10:31 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        Bharat Bhushan <bbhushan2@...vell.com>,
        Raed Salem <raeds@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: [PATCH xfrm-next 10/16] net/mlx5e: Create hardware IPsec packet offload objects

From: Leon Romanovsky <leonro@...dia.com>

Create initial hardware IPsec packet offload object and connect it
to advanced steering operation (ASO) context and queue, so the data
path can communicate with the stack.

Reviewed-by: Raed Salem <raeds@...dia.com>
Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 .../mellanox/mlx5/core/en_accel/ipsec.c       |  1 +
 .../mellanox/mlx5/core/en_accel/ipsec.h       |  3 +-
 .../mlx5/core/en_accel/ipsec_offload.c        | 37 +++++++++++++++++++
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
index d2c814e7af97..c5bccc0df60d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.c
@@ -176,6 +176,7 @@ mlx5e_ipsec_build_accel_xfrm_attrs(struct mlx5e_ipsec_sa_entry *sa_entry,
 	memcpy(&attrs->saddr, x->props.saddr.a6, sizeof(attrs->saddr));
 	memcpy(&attrs->daddr, x->id.daddr.a6, sizeof(attrs->daddr));
 	attrs->family = x->props.family;
+	attrs->type = x->xso.type;
 }
 
 static inline int mlx5e_xfrm_validate_state(struct xfrm_state *x)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h
index 8e2f88f269ac..2c9aedf6b0ef 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec.h
@@ -73,6 +73,7 @@ struct mlx5_accel_esp_xfrm_attrs {
 	u8 dir : 2;
 	u8 esn_overlap : 1;
 	u8 esn_trigger : 1;
+	u8 type : 2;
 	u8 family;
 	u32 replay_window;
 };
@@ -102,8 +103,6 @@ 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 {
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c
index 7fef5de55229..fc88454aaf8d 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ipsec_offload.c
@@ -53,6 +53,38 @@ u32 mlx5_ipsec_device_caps(struct mlx5_core_dev *mdev)
 }
 EXPORT_SYMBOL_GPL(mlx5_ipsec_device_caps);
 
+static void mlx5e_ipsec_packet_setup(void *obj, u32 pdn,
+				     struct mlx5_accel_esp_xfrm_attrs *attrs)
+{
+	void *aso_ctx;
+
+	aso_ctx = MLX5_ADDR_OF(ipsec_obj, obj, ipsec_aso);
+	if (attrs->esn_trigger) {
+		MLX5_SET(ipsec_aso, aso_ctx, esn_event_arm, 1);
+
+		if (attrs->dir == XFRM_DEV_OFFLOAD_IN) {
+			MLX5_SET(ipsec_aso, aso_ctx, window_sz,
+				 attrs->replay_window / 64);
+			MLX5_SET(ipsec_aso, aso_ctx, mode,
+				 MLX5_IPSEC_ASO_REPLAY_PROTECTION);
+			}
+	}
+
+	/* ASO context */
+	MLX5_SET(ipsec_obj, obj, ipsec_aso_access_pd, pdn);
+	MLX5_SET(ipsec_obj, obj, full_offload, 1);
+	MLX5_SET(ipsec_aso, aso_ctx, valid, 1);
+	/* MLX5_IPSEC_ASO_REG_C_4_5 is type C register that is used
+	 * in flow steering to perform matching against. Please be
+	 * aware that this register was chosen arbitrary and can't
+	 * be used in other places as long as IPsec packet offload
+	 * active.
+	 */
+	MLX5_SET(ipsec_obj, obj, aso_return_reg, MLX5_IPSEC_ASO_REG_C_4_5);
+	if (attrs->dir == XFRM_DEV_OFFLOAD_OUT)
+		MLX5_SET(ipsec_aso, aso_ctx, mode, MLX5_IPSEC_ASO_INC_SN);
+}
+
 static int mlx5_create_ipsec_obj(struct mlx5e_ipsec_sa_entry *sa_entry)
 {
 	struct mlx5_accel_esp_xfrm_attrs *attrs = &sa_entry->attrs;
@@ -61,6 +93,7 @@ static int mlx5_create_ipsec_obj(struct mlx5e_ipsec_sa_entry *sa_entry)
 	u32 out[MLX5_ST_SZ_DW(general_obj_out_cmd_hdr)];
 	u32 in[MLX5_ST_SZ_DW(create_ipsec_obj_in)] = {};
 	void *obj, *salt_p, *salt_iv_p;
+	struct mlx5e_hw_objs *res;
 	int err;
 
 	obj = MLX5_ADDR_OF(create_ipsec_obj_in, in, ipsec_object);
@@ -87,6 +120,10 @@ static int mlx5_create_ipsec_obj(struct mlx5e_ipsec_sa_entry *sa_entry)
 	MLX5_SET(general_obj_in_cmd_hdr, in, obj_type,
 		 MLX5_GENERAL_OBJECT_TYPES_IPSEC);
 
+	res = &mdev->mlx5e_res.hw_objs;
+	if (attrs->type == XFRM_DEV_OFFLOAD_PACKET)
+		mlx5e_ipsec_packet_setup(obj, res->pdn, attrs);
+
 	err = mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
 	if (!err)
 		sa_entry->ipsec_obj_id =
-- 
2.38.1