net/mlx5e: TLS, Add Innova TLS TX support

Add NETIF_F_HW_TLS_TX capability and expose tlsdev_ops to work with the
TLS generic NIC offload infrastructure.
The NETIF_F_HW_TLS_TX capability will be added in the next patch.

Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Acked-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 238 insertions, 0 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c
new file mode 100644
index 000000000000..38d88108a55a
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.c
@@ -0,0 +1,173 @@
+/*
+ * Copyright (c) 2018 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include <linux/netdevice.h>
+#include <net/ipv6.h>
+#include "en_accel/tls.h"
+#include "accel/tls.h"
+
+static void mlx5e_tls_set_ipv4_flow(void *flow, struct sock *sk)
+{
+	struct inet_sock *inet = inet_sk(sk);
+
+	MLX5_SET(tls_flow, flow, ipv6, 0);
+	memcpy(MLX5_ADDR_OF(tls_flow, flow, dst_ipv4_dst_ipv6.ipv4_layout.ipv4),
+	       &inet->inet_daddr, MLX5_FLD_SZ_BYTES(ipv4_layout, ipv4));
+	memcpy(MLX5_ADDR_OF(tls_flow, flow, src_ipv4_src_ipv6.ipv4_layout.ipv4),
+	       &inet->inet_rcv_saddr, MLX5_FLD_SZ_BYTES(ipv4_layout, ipv4));
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void mlx5e_tls_set_ipv6_flow(void *flow, struct sock *sk)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+
+	MLX5_SET(tls_flow, flow, ipv6, 1);
+	memcpy(MLX5_ADDR_OF(tls_flow, flow, dst_ipv4_dst_ipv6.ipv6_layout.ipv6),
+	       &sk->sk_v6_daddr, MLX5_FLD_SZ_BYTES(ipv6_layout, ipv6));
+	memcpy(MLX5_ADDR_OF(tls_flow, flow, src_ipv4_src_ipv6.ipv6_layout.ipv6),
+	       &np->saddr, MLX5_FLD_SZ_BYTES(ipv6_layout, ipv6));
+}
+#endif
+
+static void mlx5e_tls_set_flow_tcp_ports(void *flow, struct sock *sk)
+{
+	struct inet_sock *inet = inet_sk(sk);
+
+	memcpy(MLX5_ADDR_OF(tls_flow, flow, src_port), &inet->inet_sport,
+	       MLX5_FLD_SZ_BYTES(tls_flow, src_port));
+	memcpy(MLX5_ADDR_OF(tls_flow, flow, dst_port), &inet->inet_dport,
+	       MLX5_FLD_SZ_BYTES(tls_flow, dst_port));
+}
+
+static int mlx5e_tls_set_flow(void *flow, struct sock *sk, u32 caps)
+{
+	switch (sk->sk_family) {
+	case AF_INET:
+		mlx5e_tls_set_ipv4_flow(flow, sk);
+		break;
+#if IS_ENABLED(CONFIG_IPV6)
+	case AF_INET6:
+		if (!sk->sk_ipv6only &&
+		    ipv6_addr_type(&sk->sk_v6_daddr) == IPV6_ADDR_MAPPED) {
+			mlx5e_tls_set_ipv4_flow(flow, sk);
+			break;
+		}
+		if (!(caps & MLX5_ACCEL_TLS_IPV6))
+			goto error_out;
+
+		mlx5e_tls_set_ipv6_flow(flow, sk);
+		break;
+#endif
+	default:
+		goto error_out;
+	}
+
+	mlx5e_tls_set_flow_tcp_ports(flow, sk);
+	return 0;
+error_out:
+	return -EINVAL;
+}
+
+static int mlx5e_tls_add(struct net_device *netdev, struct sock *sk,
+			 enum tls_offload_ctx_dir direction,
+			 struct tls_crypto_info *crypto_info,
+			 u32 start_offload_tcp_sn)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+	struct tls_context *tls_ctx = tls_get_ctx(sk);
+	struct mlx5_core_dev *mdev = priv->mdev;
+	u32 caps = mlx5_accel_tls_device_caps(mdev);
+	int ret = -ENOMEM;
+	void *flow;
+
+	if (direction != TLS_OFFLOAD_CTX_DIR_TX)
+		return -EINVAL;
+
+	flow = kzalloc(MLX5_ST_SZ_BYTES(tls_flow), GFP_KERNEL);
+	if (!flow)
+		return ret;
+
+	ret = mlx5e_tls_set_flow(flow, sk, caps);
+	if (ret)
+		goto free_flow;
+
+	if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
+		struct mlx5e_tls_offload_context *tx_ctx =
+		    mlx5e_get_tls_tx_context(tls_ctx);
+		u32 swid;
+
+		ret = mlx5_accel_tls_add_tx_flow(mdev, flow, crypto_info,
+						 start_offload_tcp_sn, &swid);
+		if (ret < 0)
+			goto free_flow;
+
+		tx_ctx->swid = htonl(swid);
+		tx_ctx->expected_seq = start_offload_tcp_sn;
+	}
+
+	return 0;
+free_flow:
+	kfree(flow);
+	return ret;
+}
+
+static void mlx5e_tls_del(struct net_device *netdev,
+			  struct tls_context *tls_ctx,
+			  enum tls_offload_ctx_dir direction)
+{
+	struct mlx5e_priv *priv = netdev_priv(netdev);
+
+	if (direction == TLS_OFFLOAD_CTX_DIR_TX) {
+		u32 swid = ntohl(mlx5e_get_tls_tx_context(tls_ctx)->swid);
+
+		mlx5_accel_tls_del_tx_flow(priv->mdev, swid);
+	} else {
+		netdev_err(netdev, "unsupported direction %d\n", direction);
+	}
+}
+
+static const struct tlsdev_ops mlx5e_tls_ops = {
+	.tls_dev_add = mlx5e_tls_add,
+	.tls_dev_del = mlx5e_tls_del,
+};
+
+void mlx5e_tls_build_netdev(struct mlx5e_priv *priv)
+{
+	struct net_device *netdev = priv->netdev;
+
+	if (!mlx5_accel_is_tls_device(priv->mdev))
+		return;
+
+	netdev->tlsdev_ops = &mlx5e_tls_ops;
+}
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.h b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.h
new file mode 100644
index 000000000000..f7216b9b98e2
--- /dev/null
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_accel/tls.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2018 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+#ifndef __MLX5E_TLS_H__
+#define __MLX5E_TLS_H__
+
+#ifdef CONFIG_MLX5_EN_TLS
+
+#include <net/tls.h>
+#include "en.h"
+
+struct mlx5e_tls_offload_context {
+	struct tls_offload_context base;
+	u32 expected_seq;
+	__be32 swid;
+};
+
+static inline struct mlx5e_tls_offload_context *
+mlx5e_get_tls_tx_context(struct tls_context *tls_ctx)
+{
+	BUILD_BUG_ON(sizeof(struct mlx5e_tls_offload_context) >
+		     TLS_OFFLOAD_CONTEXT_SIZE);
+	return container_of(tls_offload_ctx(tls_ctx),
+			    struct mlx5e_tls_offload_context,
+			    base);
+}
+
+void mlx5e_tls_build_netdev(struct mlx5e_priv *priv);
+
+#else
+
+static inline void mlx5e_tls_build_netdev(struct mlx5e_priv *priv) { }
+
+#endif
+
+#endif /* __MLX5E_TLS_H__ */