xref: /linux/drivers/net/ethernet/mellanox/mlx5/core/en_accel/psp.c (revision 18a7e218cfcdca6666e1f7356533e4c988780b57)

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/* Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
#include <linux/mlx5/device.h>
#include <net/psp.h>
#include <linux/psp.h>
#include "mlx5_core.h"
#include "psp.h"
#include "lib/crypto.h"
#include "en_accel/psp.h"
#include "fs_core.h"

enum accel_fs_psp_type {
	ACCEL_FS_PSP4,
	ACCEL_FS_PSP6,
	ACCEL_FS_PSP_NUM_TYPES,
};

enum accel_psp_syndrome {
	PSP_OK = 0,
	PSP_ICV_FAIL,
	PSP_BAD_TRAILER,
};

struct mlx5e_psp_tx {
	struct mlx5_flow_namespace *ns;
	struct mlx5_flow_table *ft;
	struct mlx5_flow_group *fg;
	struct mlx5_flow_handle *rule;
	struct mutex mutex; /* Protect PSP TX steering */
	u32 refcnt;
};

struct mlx5e_psp_rx_err {
	struct mlx5_flow_table *ft;
	struct mlx5_flow_handle *rule;
	struct mlx5_flow_handle *drop_rule;
	struct mlx5_modify_hdr *copy_modify_hdr;
};

struct mlx5e_accel_fs_psp_prot {
	struct mlx5_flow_table *ft;
	struct mlx5_flow_group *miss_group;
	struct mlx5_flow_handle *miss_rule;
	struct mlx5_flow_destination default_dest;
	struct mlx5e_psp_rx_err rx_err;
	u32 refcnt;
	struct mutex prot_mutex; /* protect ESP4/ESP6 protocol */
	struct mlx5_flow_handle *def_rule;
};

struct mlx5e_accel_fs_psp {
	struct mlx5e_accel_fs_psp_prot fs_prot[ACCEL_FS_PSP_NUM_TYPES];
};

struct mlx5e_psp_fs {
	struct mlx5_core_dev *mdev;
	struct mlx5e_psp_tx *tx_fs;
	/* Rx manage */
	struct mlx5e_flow_steering *fs;
	struct mlx5e_accel_fs_psp *rx_fs;
};

/* PSP RX flow steering */
static enum mlx5_traffic_types fs_psp2tt(enum accel_fs_psp_type i)
{
	if (i == ACCEL_FS_PSP4)
		return MLX5_TT_IPV4_UDP;

	return MLX5_TT_IPV6_UDP;
}

static void accel_psp_fs_rx_err_del_rules(struct mlx5e_psp_fs *fs,
					  struct mlx5e_psp_rx_err *rx_err)
{
	if (rx_err->drop_rule) {
		mlx5_del_flow_rules(rx_err->drop_rule);
		rx_err->drop_rule = NULL;
	}

	if (rx_err->rule) {
		mlx5_del_flow_rules(rx_err->rule);
		rx_err->rule = NULL;
	}

	if (rx_err->copy_modify_hdr) {
		mlx5_modify_header_dealloc(fs->mdev, rx_err->copy_modify_hdr);
		rx_err->copy_modify_hdr = NULL;
	}
}

static void accel_psp_fs_rx_err_destroy_ft(struct mlx5e_psp_fs *fs,
					   struct mlx5e_psp_rx_err *rx_err)
{
	accel_psp_fs_rx_err_del_rules(fs, rx_err);

	if (rx_err->ft) {
		mlx5_destroy_flow_table(rx_err->ft);
		rx_err->ft = NULL;
	}
}

static void accel_psp_setup_syndrome_match(struct mlx5_flow_spec *spec,
					   enum accel_psp_syndrome syndrome)
{
	void *misc_params_2;

	spec->match_criteria_enable |= MLX5_MATCH_MISC_PARAMETERS_2;
	misc_params_2 = MLX5_ADDR_OF(fte_match_param, spec->match_criteria, misc_parameters_2);
	MLX5_SET_TO_ONES(fte_match_set_misc2, misc_params_2, psp_syndrome);
	misc_params_2 = MLX5_ADDR_OF(fte_match_param, spec->match_value, misc_parameters_2);
	MLX5_SET(fte_match_set_misc2, misc_params_2, psp_syndrome, syndrome);
}

static int accel_psp_fs_rx_err_add_rule(struct mlx5e_psp_fs *fs,
					struct mlx5e_accel_fs_psp_prot *fs_prot,
					struct mlx5e_psp_rx_err *rx_err)
{
	u8 action[MLX5_UN_SZ_BYTES(set_add_copy_action_in_auto)] = {};
	struct mlx5_core_dev *mdev = fs->mdev;
	struct mlx5_flow_act flow_act = {};
	struct mlx5_modify_hdr *modify_hdr;
	struct mlx5_flow_handle *fte;
	struct mlx5_flow_spec *spec;
	int err = 0;

	spec = kzalloc(sizeof(*spec), GFP_KERNEL);
	if (!spec)
		return -ENOMEM;

	/* Action to copy 7 bit psp_syndrome to regB[23:29] */
	MLX5_SET(copy_action_in, action, action_type, MLX5_ACTION_TYPE_COPY);
	MLX5_SET(copy_action_in, action, src_field, MLX5_ACTION_IN_FIELD_PSP_SYNDROME);
	MLX5_SET(copy_action_in, action, src_offset, 0);
	MLX5_SET(copy_action_in, action, length, 7);
	MLX5_SET(copy_action_in, action, dst_field, MLX5_ACTION_IN_FIELD_METADATA_REG_B);
	MLX5_SET(copy_action_in, action, dst_offset, 23);

	modify_hdr = mlx5_modify_header_alloc(mdev, MLX5_FLOW_NAMESPACE_KERNEL,
					      1, action);
	if (IS_ERR(modify_hdr)) {
		err = PTR_ERR(modify_hdr);
		mlx5_core_err(mdev,
			      "fail to alloc psp copy modify_header_id err=%d\n", err);
		goto out_spec;
	}

	accel_psp_setup_syndrome_match(spec, PSP_OK);
	/* create fte */
	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_MOD_HDR |
		MLX5_FLOW_CONTEXT_ACTION_FWD_DEST;
	flow_act.modify_hdr = modify_hdr;
	fte = mlx5_add_flow_rules(rx_err->ft, spec, &flow_act,
				  &fs_prot->default_dest, 1);
	if (IS_ERR(fte)) {
		err = PTR_ERR(fte);
		mlx5_core_err(mdev, "fail to add psp rx err copy rule err=%d\n", err);
		goto out;
	}
	rx_err->rule = fte;

	/* add default drop rule */
	memset(spec, 0, sizeof(*spec));
	memset(&flow_act, 0, sizeof(flow_act));
	/* create fte */
	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_DROP;
	fte = mlx5_add_flow_rules(rx_err->ft, spec, &flow_act, NULL, 0);
	if (IS_ERR(fte)) {
		err = PTR_ERR(fte);
		mlx5_core_err(mdev, "fail to add psp rx err drop rule err=%d\n", err);
		goto out_drop_rule;
	}
	rx_err->drop_rule = fte;
	rx_err->copy_modify_hdr = modify_hdr;

	goto out_spec;

out_drop_rule:
	mlx5_del_flow_rules(rx_err->rule);
	rx_err->rule = NULL;
out:
	mlx5_modify_header_dealloc(mdev, modify_hdr);
out_spec:
	kfree(spec);
	return err;
}

static int accel_psp_fs_rx_err_create_ft(struct mlx5e_psp_fs *fs,
					 struct mlx5e_accel_fs_psp_prot *fs_prot,
					 struct mlx5e_psp_rx_err *rx_err)
{
	struct mlx5_flow_namespace *ns = mlx5e_fs_get_ns(fs->fs, false);
	struct mlx5_flow_table_attr ft_attr = {};
	struct mlx5_flow_table *ft;
	int err;

	ft_attr.max_fte = 2;
	ft_attr.autogroup.max_num_groups = 2;
	ft_attr.level = MLX5E_ACCEL_FS_ESP_FT_ERR_LEVEL; // MLX5E_ACCEL_FS_TCP_FT_LEVEL
	ft_attr.prio = MLX5E_NIC_PRIO;
	ft = mlx5_create_auto_grouped_flow_table(ns, &ft_attr);
	if (IS_ERR(ft)) {
		err = PTR_ERR(ft);
		mlx5_core_err(fs->mdev, "fail to create psp rx inline ft err=%d\n", err);
		return err;
	}

	rx_err->ft = ft;
	err = accel_psp_fs_rx_err_add_rule(fs, fs_prot, rx_err);
	if (err)
		goto out_err;

	return 0;

out_err:
	mlx5_destroy_flow_table(ft);
	rx_err->ft = NULL;
	return err;
}

static void accel_psp_fs_rx_fs_destroy(struct mlx5e_accel_fs_psp_prot *fs_prot)
{
	if (fs_prot->def_rule) {
		mlx5_del_flow_rules(fs_prot->def_rule);
		fs_prot->def_rule = NULL;
	}

	if (fs_prot->miss_rule) {
		mlx5_del_flow_rules(fs_prot->miss_rule);
		fs_prot->miss_rule = NULL;
	}

	if (fs_prot->miss_group) {
		mlx5_destroy_flow_group(fs_prot->miss_group);
		fs_prot->miss_group = NULL;
	}

	if (fs_prot->ft) {
		mlx5_destroy_flow_table(fs_prot->ft);
		fs_prot->ft = NULL;
	}
}

static void setup_fte_udp_psp(struct mlx5_flow_spec *spec, u16 udp_port)
{
	spec->match_criteria_enable |= MLX5_MATCH_OUTER_HEADERS;
	MLX5_SET(fte_match_set_lyr_2_4, spec->match_criteria, udp_dport, 0xffff);
	MLX5_SET(fte_match_set_lyr_2_4, spec->match_value, udp_dport, udp_port);
	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, spec->match_criteria, ip_protocol);
	MLX5_SET(fte_match_set_lyr_2_4, spec->match_value, ip_protocol, IPPROTO_UDP);
}

static int accel_psp_fs_rx_create_ft(struct mlx5e_psp_fs *fs,
				     struct mlx5e_accel_fs_psp_prot *fs_prot)
{
	struct mlx5_flow_namespace *ns = mlx5e_fs_get_ns(fs->fs, false);
	u8 action[MLX5_UN_SZ_BYTES(set_add_copy_action_in_auto)] = {};
	int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
	struct mlx5_modify_hdr *modify_hdr = NULL;
	struct mlx5_flow_table_attr ft_attr = {};
	struct mlx5_flow_destination dest = {};
	struct mlx5_core_dev *mdev = fs->mdev;
	struct mlx5_flow_group *miss_group;
	MLX5_DECLARE_FLOW_ACT(flow_act);
	struct mlx5_flow_handle *rule;
	struct mlx5_flow_spec *spec;
	struct mlx5_flow_table *ft;
	u32 *flow_group_in;
	int err = 0;

	flow_group_in = kvzalloc(inlen, GFP_KERNEL);
	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
	if (!flow_group_in || !spec) {
		err = -ENOMEM;
		goto out;
	}

	/* Create FT */
	ft_attr.max_fte = 2;
	ft_attr.level = MLX5E_ACCEL_FS_ESP_FT_LEVEL;
	ft_attr.prio = MLX5E_NIC_PRIO;
	ft_attr.autogroup.num_reserved_entries = 1;
	ft_attr.autogroup.max_num_groups = 1;
	ft = mlx5_create_auto_grouped_flow_table(ns, &ft_attr);
	if (IS_ERR(ft)) {
		err = PTR_ERR(ft);
		mlx5_core_err(mdev, "fail to create psp rx ft err=%d\n", err);
		goto out_err;
	}
	fs_prot->ft = ft;

	/* Create miss_group */
	MLX5_SET(create_flow_group_in, flow_group_in, start_flow_index, ft->max_fte - 1);
	MLX5_SET(create_flow_group_in, flow_group_in, end_flow_index, ft->max_fte - 1);
	miss_group = mlx5_create_flow_group(ft, flow_group_in);
	if (IS_ERR(miss_group)) {
		err = PTR_ERR(miss_group);
		mlx5_core_err(mdev, "fail to create psp rx miss_group err=%d\n", err);
		goto out_err;
	}
	fs_prot->miss_group = miss_group;

	/* Create miss rule */
	rule = mlx5_add_flow_rules(ft, spec, &flow_act, &fs_prot->default_dest, 1);
	if (IS_ERR(rule)) {
		err = PTR_ERR(rule);
		mlx5_core_err(mdev, "fail to create psp rx miss_rule err=%d\n", err);
		goto out_err;
	}
	fs_prot->miss_rule = rule;

	/* Add default Rx psp rule */
	setup_fte_udp_psp(spec, PSP_DEFAULT_UDP_PORT);
	flow_act.crypto.type = MLX5_FLOW_CONTEXT_ENCRYPT_DECRYPT_TYPE_PSP;
	/* Set bit[31, 30] PSP marker */
	/* Set bit[29-23] psp_syndrome is set in error FT */
#define MLX5E_PSP_MARKER_BIT (BIT(30) | BIT(31))
	MLX5_SET(set_action_in, action, action_type, MLX5_ACTION_TYPE_SET);
	MLX5_SET(set_action_in, action, field, MLX5_ACTION_IN_FIELD_METADATA_REG_B);
	MLX5_SET(set_action_in, action, data, MLX5E_PSP_MARKER_BIT);
	MLX5_SET(set_action_in, action, offset, 0);
	MLX5_SET(set_action_in, action, length, 32);

	modify_hdr = mlx5_modify_header_alloc(mdev, MLX5_FLOW_NAMESPACE_KERNEL, 1, action);
	if (IS_ERR(modify_hdr)) {
		err = PTR_ERR(modify_hdr);
		mlx5_core_err(mdev, "fail to alloc psp set modify_header_id err=%d\n", err);
		modify_hdr = NULL;
		goto out_err;
	}

	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_FWD_DEST |
			  MLX5_FLOW_CONTEXT_ACTION_CRYPTO_DECRYPT |
			  MLX5_FLOW_CONTEXT_ACTION_MOD_HDR;
	flow_act.modify_hdr = modify_hdr;
	dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
	dest.ft = fs_prot->rx_err.ft;
	rule = mlx5_add_flow_rules(fs_prot->ft, spec, &flow_act, &dest, 1);
	if (IS_ERR(rule)) {
		err = PTR_ERR(rule);
		mlx5_core_err(mdev,
			      "fail to add psp rule Rx decryption, err=%d, flow_act.action = %#04X\n",
			      err, flow_act.action);
		goto out_err;
	}

	fs_prot->def_rule = rule;
	goto out;

out_err:
	accel_psp_fs_rx_fs_destroy(fs_prot);
out:
	kvfree(flow_group_in);
	kvfree(spec);
	return err;
}

static int accel_psp_fs_rx_destroy(struct mlx5e_psp_fs *fs, enum accel_fs_psp_type type)
{
	struct mlx5e_accel_fs_psp_prot *fs_prot;
	struct mlx5e_accel_fs_psp *accel_psp;

	accel_psp = fs->rx_fs;

	/* The netdev unreg already happened, so all offloaded rule are already removed */
	fs_prot = &accel_psp->fs_prot[type];

	accel_psp_fs_rx_fs_destroy(fs_prot);

	accel_psp_fs_rx_err_destroy_ft(fs, &fs_prot->rx_err);

	return 0;
}

static int accel_psp_fs_rx_create(struct mlx5e_psp_fs *fs, enum accel_fs_psp_type type)
{
	struct mlx5_ttc_table *ttc = mlx5e_fs_get_ttc(fs->fs, false);
	struct mlx5e_accel_fs_psp_prot *fs_prot;
	struct mlx5e_accel_fs_psp *accel_psp;
	int err;

	accel_psp = fs->rx_fs;
	fs_prot = &accel_psp->fs_prot[type];

	fs_prot->default_dest = mlx5_ttc_get_default_dest(ttc, fs_psp2tt(type));

	err = accel_psp_fs_rx_err_create_ft(fs, fs_prot, &fs_prot->rx_err);
	if (err)
		return err;

	err = accel_psp_fs_rx_create_ft(fs, fs_prot);
	if (err)
		accel_psp_fs_rx_err_destroy_ft(fs, &fs_prot->rx_err);

	return err;
}

static int accel_psp_fs_rx_ft_get(struct mlx5e_psp_fs *fs, enum accel_fs_psp_type type)
{
	struct mlx5e_accel_fs_psp_prot *fs_prot;
	struct mlx5_flow_destination dest = {};
	struct mlx5e_accel_fs_psp *accel_psp;
	struct mlx5_ttc_table *ttc;
	int err = 0;

	if (!fs || !fs->rx_fs)
		return -EINVAL;

	ttc = mlx5e_fs_get_ttc(fs->fs, false);
	accel_psp = fs->rx_fs;
	fs_prot = &accel_psp->fs_prot[type];
	mutex_lock(&fs_prot->prot_mutex);
	if (fs_prot->refcnt++)
		goto out;

	/* create FT */
	err = accel_psp_fs_rx_create(fs, type);
	if (err) {
		fs_prot->refcnt--;
		goto out;
	}

	/* connect */
	dest.type = MLX5_FLOW_DESTINATION_TYPE_FLOW_TABLE;
	dest.ft = fs_prot->ft;
	mlx5_ttc_fwd_dest(ttc, fs_psp2tt(type), &dest);

out:
	mutex_unlock(&fs_prot->prot_mutex);
	return err;
}

static void accel_psp_fs_rx_ft_put(struct mlx5e_psp_fs *fs, enum accel_fs_psp_type type)
{
	struct mlx5_ttc_table *ttc = mlx5e_fs_get_ttc(fs->fs, false);
	struct mlx5e_accel_fs_psp_prot *fs_prot;
	struct mlx5e_accel_fs_psp *accel_psp;

	accel_psp = fs->rx_fs;
	fs_prot = &accel_psp->fs_prot[type];
	mutex_lock(&fs_prot->prot_mutex);
	if (--fs_prot->refcnt)
		goto out;

	/* disconnect */
	mlx5_ttc_fwd_default_dest(ttc, fs_psp2tt(type));

	/* remove FT */
	accel_psp_fs_rx_destroy(fs, type);

out:
	mutex_unlock(&fs_prot->prot_mutex);
}

static void accel_psp_fs_cleanup_rx(struct mlx5e_psp_fs *fs)
{
	struct mlx5e_accel_fs_psp_prot *fs_prot;
	struct mlx5e_accel_fs_psp *accel_psp;
	enum accel_fs_psp_type i;

	if (!fs->rx_fs)
		return;

	accel_psp = fs->rx_fs;
	for (i = 0; i < ACCEL_FS_PSP_NUM_TYPES; i++) {
		fs_prot = &accel_psp->fs_prot[i];
		mutex_destroy(&fs_prot->prot_mutex);
		WARN_ON(fs_prot->refcnt);
	}
	kfree(fs->rx_fs);
	fs->rx_fs = NULL;
}

static int accel_psp_fs_init_rx(struct mlx5e_psp_fs *fs)
{
	struct mlx5e_accel_fs_psp_prot *fs_prot;
	struct mlx5e_accel_fs_psp *accel_psp;
	enum accel_fs_psp_type i;

	accel_psp = kzalloc(sizeof(*accel_psp), GFP_KERNEL);
	if (!accel_psp)
		return -ENOMEM;

	for (i = 0; i < ACCEL_FS_PSP_NUM_TYPES; i++) {
		fs_prot = &accel_psp->fs_prot[i];
		mutex_init(&fs_prot->prot_mutex);
	}

	fs->rx_fs = accel_psp;

	return 0;
}

void mlx5_accel_psp_fs_cleanup_rx_tables(struct mlx5e_priv *priv)
{
	int i;

	if (!priv->psp)
		return;

	for (i = 0; i < ACCEL_FS_PSP_NUM_TYPES; i++)
		accel_psp_fs_rx_ft_put(priv->psp->fs, i);
}

int mlx5_accel_psp_fs_init_rx_tables(struct mlx5e_priv *priv)
{
	struct mlx5e_psp_fs *fs;
	int err, i;

	if (!priv->psp)
		return 0;

	fs = priv->psp->fs;
	for (i = 0; i < ACCEL_FS_PSP_NUM_TYPES; i++) {
		err = accel_psp_fs_rx_ft_get(fs, i);
		if (err)
			goto out_err;
	}

	return 0;

out_err:
	i--;
	while (i >= 0) {
		accel_psp_fs_rx_ft_put(fs, i);
		--i;
	}

	return err;
}

static int accel_psp_fs_tx_create_ft_table(struct mlx5e_psp_fs *fs)
{
	int inlen = MLX5_ST_SZ_BYTES(create_flow_group_in);
	struct mlx5_flow_table_attr ft_attr = {};
	struct mlx5_core_dev *mdev = fs->mdev;
	struct mlx5_flow_act flow_act = {};
	u32 *in, *mc, *outer_headers_c;
	struct mlx5_flow_handle *rule;
	struct mlx5_flow_spec *spec;
	struct mlx5e_psp_tx *tx_fs;
	struct mlx5_flow_table *ft;
	struct mlx5_flow_group *fg;
	int err = 0;

	spec = kvzalloc(sizeof(*spec), GFP_KERNEL);
	in = kvzalloc(inlen, GFP_KERNEL);
	if (!spec || !in) {
		err = -ENOMEM;
		goto out;
	}

	ft_attr.max_fte = 1;
#define MLX5E_PSP_PRIO 0
	ft_attr.prio = MLX5E_PSP_PRIO;
#define MLX5E_PSP_LEVEL 0
	ft_attr.level = MLX5E_PSP_LEVEL;
	ft_attr.autogroup.max_num_groups = 1;

	tx_fs = fs->tx_fs;
	ft = mlx5_create_flow_table(tx_fs->ns, &ft_attr);
	if (IS_ERR(ft)) {
		err = PTR_ERR(ft);
		mlx5_core_err(mdev, "PSP: fail to add psp tx flow table, err = %d\n", err);
		goto out;
	}

	mc = MLX5_ADDR_OF(create_flow_group_in, in, match_criteria);
	outer_headers_c = MLX5_ADDR_OF(fte_match_param, mc, outer_headers);
	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, ip_protocol);
	MLX5_SET_TO_ONES(fte_match_set_lyr_2_4, outer_headers_c, udp_dport);
	MLX5_SET_CFG(in, match_criteria_enable, MLX5_MATCH_OUTER_HEADERS);
	fg = mlx5_create_flow_group(ft, in);
	if (IS_ERR(fg)) {
		err = PTR_ERR(fg);
		mlx5_core_err(mdev, "PSP: fail to add psp tx flow group, err = %d\n", err);
		goto err_create_fg;
	}

	setup_fte_udp_psp(spec, PSP_DEFAULT_UDP_PORT);
	flow_act.crypto.type = MLX5_FLOW_CONTEXT_ENCRYPT_DECRYPT_TYPE_PSP;
	flow_act.flags |= FLOW_ACT_NO_APPEND;
	flow_act.action = MLX5_FLOW_CONTEXT_ACTION_ALLOW |
			  MLX5_FLOW_CONTEXT_ACTION_CRYPTO_ENCRYPT;
	rule = mlx5_add_flow_rules(ft, spec, &flow_act, NULL, 0);
	if (IS_ERR(rule)) {
		err = PTR_ERR(rule);
		mlx5_core_err(mdev, "PSP: fail to add psp tx flow rule, err = %d\n", err);
		goto err_add_flow_rule;
	}

	tx_fs->ft = ft;
	tx_fs->fg = fg;
	tx_fs->rule = rule;
	goto out;

err_add_flow_rule:
	mlx5_destroy_flow_group(fg);
err_create_fg:
	mlx5_destroy_flow_table(ft);
out:
	kvfree(in);
	kvfree(spec);
	return err;
}

static void accel_psp_fs_tx_destroy(struct mlx5e_psp_tx *tx_fs)
{
	if (!tx_fs->ft)
		return;

	mlx5_del_flow_rules(tx_fs->rule);
	mlx5_destroy_flow_group(tx_fs->fg);
	mlx5_destroy_flow_table(tx_fs->ft);
}

static int accel_psp_fs_tx_ft_get(struct mlx5e_psp_fs *fs)
{
	struct mlx5e_psp_tx *tx_fs = fs->tx_fs;
	int err = 0;

	mutex_lock(&tx_fs->mutex);
	if (tx_fs->refcnt++)
		goto out;

	err = accel_psp_fs_tx_create_ft_table(fs);
	if (err)
		tx_fs->refcnt--;
out:
	mutex_unlock(&tx_fs->mutex);
	return err;
}

static void accel_psp_fs_tx_ft_put(struct mlx5e_psp_fs *fs)
{
	struct mlx5e_psp_tx *tx_fs = fs->tx_fs;

	mutex_lock(&tx_fs->mutex);
	if (--tx_fs->refcnt)
		goto out;

	accel_psp_fs_tx_destroy(tx_fs);
out:
	mutex_unlock(&tx_fs->mutex);
}

static void accel_psp_fs_cleanup_tx(struct mlx5e_psp_fs *fs)
{
	struct mlx5e_psp_tx *tx_fs = fs->tx_fs;

	if (!tx_fs)
		return;

	mutex_destroy(&tx_fs->mutex);
	WARN_ON(tx_fs->refcnt);
	kfree(tx_fs);
	fs->tx_fs = NULL;
}

static int accel_psp_fs_init_tx(struct mlx5e_psp_fs *fs)
{
	struct mlx5_flow_namespace *ns;
	struct mlx5e_psp_tx *tx_fs;

	ns = mlx5_get_flow_namespace(fs->mdev, MLX5_FLOW_NAMESPACE_EGRESS_IPSEC);
	if (!ns)
		return -EOPNOTSUPP;

	tx_fs = kzalloc(sizeof(*tx_fs), GFP_KERNEL);
	if (!tx_fs)
		return -ENOMEM;

	mutex_init(&tx_fs->mutex);
	tx_fs->ns = ns;
	fs->tx_fs = tx_fs;
	return 0;
}

void mlx5_accel_psp_fs_cleanup_tx_tables(struct mlx5e_priv *priv)
{
	if (!priv->psp)
		return;

	accel_psp_fs_tx_ft_put(priv->psp->fs);
}

int mlx5_accel_psp_fs_init_tx_tables(struct mlx5e_priv *priv)
{
	if (!priv->psp)
		return 0;

	return accel_psp_fs_tx_ft_get(priv->psp->fs);
}

static void mlx5e_accel_psp_fs_cleanup(struct mlx5e_psp_fs *fs)
{
	accel_psp_fs_cleanup_rx(fs);
	accel_psp_fs_cleanup_tx(fs);
	kfree(fs);
}

static struct mlx5e_psp_fs *mlx5e_accel_psp_fs_init(struct mlx5e_priv *priv)
{
	struct mlx5e_psp_fs *fs;
	int err = 0;

	fs = kzalloc(sizeof(*fs), GFP_KERNEL);
	if (!fs)
		return ERR_PTR(-ENOMEM);

	fs->mdev = priv->mdev;
	err = accel_psp_fs_init_tx(fs);
	if (err)
		goto err_tx;

	fs->fs = priv->fs;
	err = accel_psp_fs_init_rx(fs);
	if (err)
		goto err_rx;

	return fs;

err_rx:
	accel_psp_fs_cleanup_tx(fs);
err_tx:
	kfree(fs);
	return ERR_PTR(err);
}

static int
mlx5e_psp_set_config(struct psp_dev *psd, struct psp_dev_config *conf,
		     struct netlink_ext_ack *extack)
{
	return 0; /* TODO: this should actually do things to the device */
}

static int
mlx5e_psp_generate_key_spi(struct mlx5_core_dev *mdev,
			   enum mlx5_psp_gen_spi_in_key_size keysz,
			   unsigned int keysz_bytes,
			   struct psp_key_parsed *key)
{
	u32 out[MLX5_ST_SZ_DW(psp_gen_spi_out) + MLX5_ST_SZ_DW(key_spi)] = {};
	u32 in[MLX5_ST_SZ_DW(psp_gen_spi_in)] = {};
	void *outkey;
	int err;

	WARN_ON_ONCE(keysz_bytes > PSP_MAX_KEY);

	MLX5_SET(psp_gen_spi_in, in, opcode, MLX5_CMD_OP_PSP_GEN_SPI);
	MLX5_SET(psp_gen_spi_in, in, key_size, keysz);
	MLX5_SET(psp_gen_spi_in, in, num_of_spi, 1);
	err = mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
	if (err)
		return err;

	outkey = MLX5_ADDR_OF(psp_gen_spi_out, out, key_spi);
	key->spi = cpu_to_be32(MLX5_GET(key_spi, outkey, spi));
	memcpy(key->key, MLX5_ADDR_OF(key_spi, outkey, key) + 32 - keysz_bytes,
	       keysz_bytes);

	return 0;
}

static int
mlx5e_psp_rx_spi_alloc(struct psp_dev *psd, u32 version,
		       struct psp_key_parsed *assoc,
		       struct netlink_ext_ack *extack)
{
	struct mlx5e_priv *priv = netdev_priv(psd->main_netdev);
	enum mlx5_psp_gen_spi_in_key_size keysz;
	u8 keysz_bytes;

	switch (version) {
	case PSP_VERSION_HDR0_AES_GCM_128:
		keysz = MLX5_PSP_GEN_SPI_IN_KEY_SIZE_128;
		keysz_bytes = 16;
		break;
	case PSP_VERSION_HDR0_AES_GCM_256:
		keysz = MLX5_PSP_GEN_SPI_IN_KEY_SIZE_256;
		keysz_bytes = 32;
		break;
	default:
		return -EINVAL;
	}

	return mlx5e_psp_generate_key_spi(priv->mdev, keysz, keysz_bytes, assoc);
}

struct psp_key {
	u32 id;
};

static int mlx5e_psp_assoc_add(struct psp_dev *psd, struct psp_assoc *pas,
			       struct netlink_ext_ack *extack)
{
	struct mlx5e_priv *priv = netdev_priv(psd->main_netdev);
	struct mlx5_core_dev *mdev = priv->mdev;
	struct psp_key_parsed *tx = &pas->tx;
	struct mlx5e_psp *psp = priv->psp;
	struct psp_key *nkey;
	int err;

	mdev = priv->mdev;
	nkey = (struct psp_key *)pas->drv_data;

	err = mlx5_create_encryption_key(mdev, tx->key,
					 psp_key_size(pas->version),
					 MLX5_ACCEL_OBJ_PSP_KEY,
					 &nkey->id);
	if (err) {
		mlx5_core_err(mdev, "Failed to create encryption key (err = %d)\n", err);
		return err;
	}

	atomic_inc(&psp->tx_key_cnt);
	return 0;
}

static void mlx5e_psp_assoc_del(struct psp_dev *psd, struct psp_assoc *pas)
{
	struct mlx5e_priv *priv = netdev_priv(psd->main_netdev);
	struct mlx5e_psp *psp = priv->psp;
	struct psp_key *nkey;

	nkey = (struct psp_key *)pas->drv_data;
	mlx5_destroy_encryption_key(priv->mdev, nkey->id);
	atomic_dec(&psp->tx_key_cnt);
}

static int mlx5e_psp_rotate_key(struct mlx5_core_dev *mdev)
{
	u32 in[MLX5_ST_SZ_DW(psp_rotate_key_in)] = {};
	u32 out[MLX5_ST_SZ_DW(psp_rotate_key_out)];

	MLX5_SET(psp_rotate_key_in, in, opcode,
		 MLX5_CMD_OP_PSP_ROTATE_KEY);

	return mlx5_cmd_exec(mdev, in, sizeof(in), out, sizeof(out));
}

static int
mlx5e_psp_key_rotate(struct psp_dev *psd, struct netlink_ext_ack *exack)
{
	struct mlx5e_priv *priv = netdev_priv(psd->main_netdev);

	/* no support for protecting against external rotations */
	psd->generation = 0;

	return mlx5e_psp_rotate_key(priv->mdev);
}

static struct psp_dev_ops mlx5_psp_ops = {
	.set_config   = mlx5e_psp_set_config,
	.rx_spi_alloc = mlx5e_psp_rx_spi_alloc,
	.tx_key_add   = mlx5e_psp_assoc_add,
	.tx_key_del   = mlx5e_psp_assoc_del,
	.key_rotate   = mlx5e_psp_key_rotate,
};

void mlx5e_psp_unregister(struct mlx5e_priv *priv)
{
	if (!priv->psp || !priv->psp->psp)
		return;

	psp_dev_unregister(priv->psp->psp);
}

void mlx5e_psp_register(struct mlx5e_priv *priv)
{
	/* FW Caps missing */
	if (!priv->psp)
		return;

	priv->psp->caps.assoc_drv_spc = sizeof(u32);
	priv->psp->caps.versions = 1 << PSP_VERSION_HDR0_AES_GCM_128;
	if (MLX5_CAP_PSP(priv->mdev, psp_crypto_esp_aes_gcm_256_encrypt) &&
	    MLX5_CAP_PSP(priv->mdev, psp_crypto_esp_aes_gcm_256_decrypt))
		priv->psp->caps.versions |= 1 << PSP_VERSION_HDR0_AES_GCM_256;

	priv->psp->psp = psp_dev_create(priv->netdev, &mlx5_psp_ops,
					&priv->psp->caps, NULL);
	if (IS_ERR(priv->psp->psp))
		mlx5_core_err(priv->mdev, "PSP failed to register due to %pe\n",
			      priv->psp->psp);
}

int mlx5e_psp_init(struct mlx5e_priv *priv)
{
	struct mlx5_core_dev *mdev = priv->mdev;
	struct mlx5e_psp_fs *fs;
	struct mlx5e_psp *psp;
	int err;

	if (!mlx5_is_psp_device(mdev)) {
		mlx5_core_dbg(mdev, "PSP offload not supported\n");
		return 0;
	}

	if (!MLX5_CAP_ETH(mdev, swp)) {
		mlx5_core_dbg(mdev, "SWP not supported\n");
		return 0;
	}

	if (!MLX5_CAP_ETH(mdev, swp_csum)) {
		mlx5_core_dbg(mdev, "SWP checksum not supported\n");
		return 0;
	}

	if (!MLX5_CAP_ETH(mdev, swp_csum_l4_partial)) {
		mlx5_core_dbg(mdev, "SWP L4 partial checksum not supported\n");
		return 0;
	}

	if (!MLX5_CAP_ETH(mdev, swp_lso)) {
		mlx5_core_dbg(mdev, "PSP LSO not supported\n");
		return 0;
	}

	psp = kzalloc(sizeof(*psp), GFP_KERNEL);
	if (!psp)
		return -ENOMEM;

	priv->psp = psp;
	fs = mlx5e_accel_psp_fs_init(priv);
	if (IS_ERR(fs)) {
		err = PTR_ERR(fs);
		goto out_err;
	}

	psp->fs = fs;

	mlx5_core_dbg(priv->mdev, "PSP attached to netdevice\n");
	return 0;

out_err:
	priv->psp = NULL;
	kfree(psp);
	return err;
}

void mlx5e_psp_cleanup(struct mlx5e_priv *priv)
{
	struct mlx5e_psp *psp = priv->psp;

	if (!psp)
		return;

	WARN_ON(atomic_read(&psp->tx_key_cnt));
	mlx5e_accel_psp_fs_cleanup(psp->fs);
	priv->psp = NULL;
	kfree(psp);
}