xref: /linux-6.6.21/drivers/net/ethernet/mellanox/mlx5/core/en_accel/ktls_tx.c

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
// Copyright (c) 2019 Mellanox Technologies.

#include <linux/debugfs.h>
#include "en_accel/ktls.h"
#include "en_accel/ktls_txrx.h"
#include "en_accel/ktls_utils.h"

struct mlx5e_dump_wqe {
	struct mlx5_wqe_ctrl_seg ctrl;
	struct mlx5_wqe_data_seg data;
};

#define MLX5E_KTLS_DUMP_WQEBBS \
	(DIV_ROUND_UP(sizeof(struct mlx5e_dump_wqe), MLX5_SEND_WQE_BB))

static u8
mlx5e_ktls_dumps_num_wqes(struct mlx5e_params *params, unsigned int nfrags,
			  unsigned int sync_len)
{
	/* Given the MTU and sync_len, calculates an upper bound for the
	 * number of DUMP WQEs needed for the TX resync of a record.
	 */
	return nfrags + DIV_ROUND_UP(sync_len, MLX5E_SW2HW_MTU(params, params->sw_mtu));
}

u16 mlx5e_ktls_get_stop_room(struct mlx5_core_dev *mdev, struct mlx5e_params *params)
{
	u16 num_dumps, stop_room = 0;

	if (!mlx5e_is_ktls_tx(mdev))
		return 0;

	num_dumps = mlx5e_ktls_dumps_num_wqes(params, MAX_SKB_FRAGS, TLS_MAX_PAYLOAD_SIZE);

	stop_room += mlx5e_stop_room_for_wqe(mdev, MLX5E_TLS_SET_STATIC_PARAMS_WQEBBS);
	stop_room += mlx5e_stop_room_for_wqe(mdev, MLX5E_TLS_SET_PROGRESS_PARAMS_WQEBBS);
	stop_room += num_dumps * mlx5e_stop_room_for_wqe(mdev, MLX5E_KTLS_DUMP_WQEBBS);
	stop_room += 1; /* fence nop */

	return stop_room;
}

static void mlx5e_ktls_set_tisc(struct mlx5_core_dev *mdev, void *tisc)
{
	MLX5_SET(tisc, tisc, tls_en, 1);
	MLX5_SET(tisc, tisc, pd, mdev->mlx5e_res.hw_objs.pdn);
	MLX5_SET(tisc, tisc, transport_domain, mdev->mlx5e_res.hw_objs.td.tdn);
}

static int mlx5e_ktls_create_tis(struct mlx5_core_dev *mdev, u32 *tisn)
{
	u32 in[MLX5_ST_SZ_DW(create_tis_in)] = {};

	mlx5e_ktls_set_tisc(mdev, MLX5_ADDR_OF(create_tis_in, in, ctx));

	return mlx5_core_create_tis(mdev, in, tisn);
}

static int mlx5e_ktls_create_tis_cb(struct mlx5_core_dev *mdev,
				    struct mlx5_async_ctx *async_ctx,
				    u32 *out, int outlen,
				    mlx5_async_cbk_t callback,
				    struct mlx5_async_work *context)
{
	u32 in[MLX5_ST_SZ_DW(create_tis_in)] = {};

	mlx5e_ktls_set_tisc(mdev, MLX5_ADDR_OF(create_tis_in, in, ctx));
	MLX5_SET(create_tis_in, in, opcode, MLX5_CMD_OP_CREATE_TIS);

	return mlx5_cmd_exec_cb(async_ctx, in, sizeof(in),
				out, outlen, callback, context);
}

static int mlx5e_ktls_destroy_tis_cb(struct mlx5_core_dev *mdev, u32 tisn,
				     struct mlx5_async_ctx *async_ctx,
				     u32 *out, int outlen,
				     mlx5_async_cbk_t callback,
				     struct mlx5_async_work *context)
{
	u32 in[MLX5_ST_SZ_DW(destroy_tis_in)] = {};

	MLX5_SET(destroy_tis_in, in, opcode, MLX5_CMD_OP_DESTROY_TIS);
	MLX5_SET(destroy_tis_in, in, tisn, tisn);

	return mlx5_cmd_exec_cb(async_ctx, in, sizeof(in),
				out, outlen, callback, context);
}

struct mlx5e_ktls_offload_context_tx {
	/* fast path */
	u32 expected_seq;
	u32 tisn;
	bool ctx_post_pending;
	/* control / resync */
	struct list_head list_node; /* member of the pool */
	union mlx5e_crypto_info crypto_info;
	struct tls_offload_context_tx *tx_ctx;
	struct mlx5_core_dev *mdev;
	struct mlx5e_tls_sw_stats *sw_stats;
	struct mlx5_crypto_dek *dek;
	u8 create_err : 1;
};

static void
mlx5e_set_ktls_tx_priv_ctx(struct tls_context *tls_ctx,
			   struct mlx5e_ktls_offload_context_tx *priv_tx)
{
	struct mlx5e_ktls_offload_context_tx **ctx =
		__tls_driver_ctx(tls_ctx, TLS_OFFLOAD_CTX_DIR_TX);

	BUILD_BUG_ON(sizeof(priv_tx) > TLS_DRIVER_STATE_SIZE_TX);

	*ctx = priv_tx;
}

static struct mlx5e_ktls_offload_context_tx *
mlx5e_get_ktls_tx_priv_ctx(struct tls_context *tls_ctx)
{
	struct mlx5e_ktls_offload_context_tx **ctx =
		__tls_driver_ctx(tls_ctx, TLS_OFFLOAD_CTX_DIR_TX);

	return *ctx;
}

/* struct for callback API management */
struct mlx5e_async_ctx {
	struct mlx5_async_work context;
	struct mlx5_async_ctx *async_ctx;
	struct mlx5e_ktls_offload_context_tx *priv_tx;
	int err;
	union {
		u32 out_create[MLX5_ST_SZ_DW(create_tis_out)];
		u32 out_destroy[MLX5_ST_SZ_DW(destroy_tis_out)];
	};
};

struct mlx5e_bulk_async_ctx {
	struct mlx5_async_ctx async_ctx;
	DECLARE_FLEX_ARRAY(struct mlx5e_async_ctx, arr);
};

static struct mlx5e_bulk_async_ctx *mlx5e_bulk_async_init(struct mlx5_core_dev *mdev, int n)
{
	struct mlx5e_bulk_async_ctx *bulk_async;
	int sz;
	int i;

	sz = struct_size(bulk_async, arr, n);
	bulk_async = kvzalloc(sz, GFP_KERNEL);
	if (!bulk_async)
		return NULL;

	mlx5_cmd_init_async_ctx(mdev, &bulk_async->async_ctx);

	for (i = 0; i < n; i++)
		bulk_async->arr[i].async_ctx = &bulk_async->async_ctx;

	return bulk_async;
}

static void mlx5e_bulk_async_cleanup(struct mlx5e_bulk_async_ctx *bulk_async)
{
	mlx5_cmd_cleanup_async_ctx(&bulk_async->async_ctx);
	kvfree(bulk_async);
}

static void create_tis_callback(int status, struct mlx5_async_work *context)
{
	struct mlx5e_async_ctx *async =
		container_of(context, struct mlx5e_async_ctx, context);
	struct mlx5e_ktls_offload_context_tx *priv_tx = async->priv_tx;

	if (status) {
		async->err = status;
		priv_tx->create_err = 1;
		return;
	}

	priv_tx->tisn = MLX5_GET(create_tis_out, async->out_create, tisn);
}

static void destroy_tis_callback(int status, struct mlx5_async_work *context)
{
	struct mlx5e_async_ctx *async =
		container_of(context, struct mlx5e_async_ctx, context);
	struct mlx5e_ktls_offload_context_tx *priv_tx = async->priv_tx;

	kfree(priv_tx);
}

static struct mlx5e_ktls_offload_context_tx *
mlx5e_tls_priv_tx_init(struct mlx5_core_dev *mdev, struct mlx5e_tls_sw_stats *sw_stats,
		       struct mlx5e_async_ctx *async)
{
	struct mlx5e_ktls_offload_context_tx *priv_tx;
	int err;

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

	priv_tx->mdev = mdev;
	priv_tx->sw_stats = sw_stats;

	if (!async) {
		err = mlx5e_ktls_create_tis(mdev, &priv_tx->tisn);
		if (err)
			goto err_out;
	} else {
		async->priv_tx = priv_tx;
		err = mlx5e_ktls_create_tis_cb(mdev, async->async_ctx,
					       async->out_create, sizeof(async->out_create),
					       create_tis_callback, &async->context);
		if (err)
			goto err_out;
	}

	return priv_tx;

err_out:
	kfree(priv_tx);
	return ERR_PTR(err);
}

static void mlx5e_tls_priv_tx_cleanup(struct mlx5e_ktls_offload_context_tx *priv_tx,
				      struct mlx5e_async_ctx *async)
{
	if (priv_tx->create_err) {
		kfree(priv_tx);
		return;
	}
	async->priv_tx = priv_tx;
	mlx5e_ktls_destroy_tis_cb(priv_tx->mdev, priv_tx->tisn,
				  async->async_ctx,
				  async->out_destroy, sizeof(async->out_destroy),
				  destroy_tis_callback, &async->context);
}

static void mlx5e_tls_priv_tx_list_cleanup(struct mlx5_core_dev *mdev,
					   struct list_head *list, int size)
{
	struct mlx5e_ktls_offload_context_tx *obj, *n;
	struct mlx5e_bulk_async_ctx *bulk_async;
	int i;

	bulk_async = mlx5e_bulk_async_init(mdev, size);
	if (!bulk_async)
		return;

	i = 0;
	list_for_each_entry_safe(obj, n, list, list_node) {
		mlx5e_tls_priv_tx_cleanup(obj, &bulk_async->arr[i]);
		i++;
	}

	mlx5e_bulk_async_cleanup(bulk_async);
}

/* Recycling pool API */

#define MLX5E_TLS_TX_POOL_BULK (16)
#define MLX5E_TLS_TX_POOL_HIGH (4 * 1024)
#define MLX5E_TLS_TX_POOL_LOW (MLX5E_TLS_TX_POOL_HIGH / 4)

struct mlx5e_tls_tx_pool {
	struct mlx5_core_dev *mdev;
	struct mlx5e_tls_sw_stats *sw_stats;
	struct mutex lock; /* Protects access to the pool */
	struct list_head list;
	size_t size;

	struct workqueue_struct *wq;
	struct work_struct create_work;
	struct work_struct destroy_work;
};

static void create_work(struct work_struct *work)
{
	struct mlx5e_tls_tx_pool *pool =
		container_of(work, struct mlx5e_tls_tx_pool, create_work);
	struct mlx5e_ktls_offload_context_tx *obj;
	struct mlx5e_bulk_async_ctx *bulk_async;
	LIST_HEAD(local_list);
	int i, j, err = 0;

	bulk_async = mlx5e_bulk_async_init(pool->mdev, MLX5E_TLS_TX_POOL_BULK);
	if (!bulk_async)
		return;

	for (i = 0; i < MLX5E_TLS_TX_POOL_BULK; i++) {
		obj = mlx5e_tls_priv_tx_init(pool->mdev, pool->sw_stats, &bulk_async->arr[i]);
		if (IS_ERR(obj)) {
			err = PTR_ERR(obj);
			break;
		}
		list_add(&obj->list_node, &local_list);
	}

	for (j = 0; j < i; j++) {
		struct mlx5e_async_ctx *async = &bulk_async->arr[j];

		if (!err && async->err)
			err = async->err;
	}
	atomic64_add(i, &pool->sw_stats->tx_tls_pool_alloc);
	mlx5e_bulk_async_cleanup(bulk_async);
	if (err)
		goto err_out;

	mutex_lock(&pool->lock);
	if (pool->size + MLX5E_TLS_TX_POOL_BULK >= MLX5E_TLS_TX_POOL_HIGH) {
		mutex_unlock(&pool->lock);
		goto err_out;
	}
	list_splice(&local_list, &pool->list);
	pool->size += MLX5E_TLS_TX_POOL_BULK;
	if (pool->size <= MLX5E_TLS_TX_POOL_LOW)
		queue_work(pool->wq, work);
	mutex_unlock(&pool->lock);
	return;

err_out:
	mlx5e_tls_priv_tx_list_cleanup(pool->mdev, &local_list, i);
	atomic64_add(i, &pool->sw_stats->tx_tls_pool_free);
}

static void destroy_work(struct work_struct *work)
{
	struct mlx5e_tls_tx_pool *pool =
		container_of(work, struct mlx5e_tls_tx_pool, destroy_work);
	struct mlx5e_ktls_offload_context_tx *obj;
	LIST_HEAD(local_list);
	int i = 0;

	mutex_lock(&pool->lock);
	if (pool->size < MLX5E_TLS_TX_POOL_HIGH) {
		mutex_unlock(&pool->lock);
		return;
	}

	list_for_each_entry(obj, &pool->list, list_node)
		if (++i == MLX5E_TLS_TX_POOL_BULK)
			break;

	list_cut_position(&local_list, &pool->list, &obj->list_node);
	pool->size -= MLX5E_TLS_TX_POOL_BULK;
	if (pool->size >= MLX5E_TLS_TX_POOL_HIGH)
		queue_work(pool->wq, work);
	mutex_unlock(&pool->lock);

	mlx5e_tls_priv_tx_list_cleanup(pool->mdev, &local_list, MLX5E_TLS_TX_POOL_BULK);
	atomic64_add(MLX5E_TLS_TX_POOL_BULK, &pool->sw_stats->tx_tls_pool_free);
}

static struct mlx5e_tls_tx_pool *mlx5e_tls_tx_pool_init(struct mlx5_core_dev *mdev,
							struct mlx5e_tls_sw_stats *sw_stats)
{
	struct mlx5e_tls_tx_pool *pool;

	BUILD_BUG_ON(MLX5E_TLS_TX_POOL_LOW + MLX5E_TLS_TX_POOL_BULK >= MLX5E_TLS_TX_POOL_HIGH);

	pool = kvzalloc(sizeof(*pool), GFP_KERNEL);
	if (!pool)
		return NULL;

	pool->wq = create_singlethread_workqueue("mlx5e_tls_tx_pool");
	if (!pool->wq)
		goto err_free;

	INIT_LIST_HEAD(&pool->list);
	mutex_init(&pool->lock);

	INIT_WORK(&pool->create_work, create_work);
	INIT_WORK(&pool->destroy_work, destroy_work);

	pool->mdev = mdev;
	pool->sw_stats = sw_stats;

	return pool;

err_free:
	kvfree(pool);
	return NULL;
}

static void mlx5e_tls_tx_pool_list_cleanup(struct mlx5e_tls_tx_pool *pool)
{
	while (pool->size > MLX5E_TLS_TX_POOL_BULK) {
		struct mlx5e_ktls_offload_context_tx *obj;
		LIST_HEAD(local_list);
		int i = 0;

		list_for_each_entry(obj, &pool->list, list_node)
			if (++i == MLX5E_TLS_TX_POOL_BULK)
				break;

		list_cut_position(&local_list, &pool->list, &obj->list_node);
		mlx5e_tls_priv_tx_list_cleanup(pool->mdev, &local_list, MLX5E_TLS_TX_POOL_BULK);
		atomic64_add(MLX5E_TLS_TX_POOL_BULK, &pool->sw_stats->tx_tls_pool_free);
		pool->size -= MLX5E_TLS_TX_POOL_BULK;
	}
	if (pool->size) {
		mlx5e_tls_priv_tx_list_cleanup(pool->mdev, &pool->list, pool->size);
		atomic64_add(pool->size, &pool->sw_stats->tx_tls_pool_free);
	}
}

static void mlx5e_tls_tx_pool_cleanup(struct mlx5e_tls_tx_pool *pool)
{
	mlx5e_tls_tx_pool_list_cleanup(pool);
	destroy_workqueue(pool->wq);
	kvfree(pool);
}

static void pool_push(struct mlx5e_tls_tx_pool *pool, struct mlx5e_ktls_offload_context_tx *obj)
{
	mutex_lock(&pool->lock);
	list_add(&obj->list_node, &pool->list);
	if (++pool->size == MLX5E_TLS_TX_POOL_HIGH)
		queue_work(pool->wq, &pool->destroy_work);
	mutex_unlock(&pool->lock);
}

static struct mlx5e_ktls_offload_context_tx *pool_pop(struct mlx5e_tls_tx_pool *pool)
{
	struct mlx5e_ktls_offload_context_tx *obj;

	mutex_lock(&pool->lock);
	if (unlikely(pool->size == 0)) {
		/* pool is empty:
		 * - trigger the populating work, and
		 * - serve the current context via the regular blocking api.
		 */
		queue_work(pool->wq, &pool->create_work);
		mutex_unlock(&pool->lock);
		obj = mlx5e_tls_priv_tx_init(pool->mdev, pool->sw_stats, NULL);
		if (!IS_ERR(obj))
			atomic64_inc(&pool->sw_stats->tx_tls_pool_alloc);
		return obj;
	}

	obj = list_first_entry(&pool->list, struct mlx5e_ktls_offload_context_tx,
			       list_node);
	list_del(&obj->list_node);
	if (--pool->size == MLX5E_TLS_TX_POOL_LOW)
		queue_work(pool->wq, &pool->create_work);
	mutex_unlock(&pool->lock);
	return obj;
}

/* End of pool API */

int mlx5e_ktls_add_tx(struct net_device *netdev, struct sock *sk,
		      struct tls_crypto_info *crypto_info, u32 start_offload_tcp_sn)
{
	struct mlx5e_ktls_offload_context_tx *priv_tx;
	struct mlx5e_tls_tx_pool *pool;
	struct tls_context *tls_ctx;
	struct mlx5_crypto_dek *dek;
	struct mlx5e_priv *priv;
	int err;

	tls_ctx = tls_get_ctx(sk);
	priv = netdev_priv(netdev);
	pool = priv->tls->tx_pool;

	priv_tx = pool_pop(pool);
	if (IS_ERR(priv_tx))
		return PTR_ERR(priv_tx);

	switch (crypto_info->cipher_type) {
	case TLS_CIPHER_AES_GCM_128:
		priv_tx->crypto_info.crypto_info_128 =
			*(struct tls12_crypto_info_aes_gcm_128 *)crypto_info;
		break;
	case TLS_CIPHER_AES_GCM_256:
		priv_tx->crypto_info.crypto_info_256 =
			*(struct tls12_crypto_info_aes_gcm_256 *)crypto_info;
		break;
	default:
		WARN_ONCE(1, "Unsupported cipher type %u\n",
			  crypto_info->cipher_type);
		err = -EOPNOTSUPP;
		goto err_pool_push;
	}

	dek = mlx5_ktls_create_key(priv->tls->dek_pool, crypto_info);
	if (IS_ERR(dek)) {
		err = PTR_ERR(dek);
		goto err_pool_push;
	}

	priv_tx->dek = dek;
	priv_tx->expected_seq = start_offload_tcp_sn;
	priv_tx->tx_ctx = tls_offload_ctx_tx(tls_ctx);

	mlx5e_set_ktls_tx_priv_ctx(tls_ctx, priv_tx);

	priv_tx->ctx_post_pending = true;
	atomic64_inc(&priv_tx->sw_stats->tx_tls_ctx);

	return 0;

err_pool_push:
	pool_push(pool, priv_tx);
	return err;
}

void mlx5e_ktls_del_tx(struct net_device *netdev, struct tls_context *tls_ctx)
{
	struct mlx5e_ktls_offload_context_tx *priv_tx;
	struct mlx5e_tls_tx_pool *pool;
	struct mlx5e_priv *priv;

	priv_tx = mlx5e_get_ktls_tx_priv_ctx(tls_ctx);
	priv = netdev_priv(netdev);
	pool = priv->tls->tx_pool;

	atomic64_inc(&priv_tx->sw_stats->tx_tls_del);
	mlx5_ktls_destroy_key(priv->tls->dek_pool, priv_tx->dek);
	pool_push(pool, priv_tx);
}

static void tx_fill_wi(struct mlx5e_txqsq *sq,
		       u16 pi, u8 num_wqebbs, u32 num_bytes,
		       struct page *page)
{
	struct mlx5e_tx_wqe_info *wi = &sq->db.wqe_info[pi];

	*wi = (struct mlx5e_tx_wqe_info) {
		.num_wqebbs = num_wqebbs,
		.num_bytes  = num_bytes,
		.resync_dump_frag_page = page,
	};
}

static bool
mlx5e_ktls_tx_offload_test_and_clear_pending(struct mlx5e_ktls_offload_context_tx *priv_tx)
{
	bool ret = priv_tx->ctx_post_pending;

	priv_tx->ctx_post_pending = false;

	return ret;
}

static void
post_static_params(struct mlx5e_txqsq *sq,
		   struct mlx5e_ktls_offload_context_tx *priv_tx,
		   bool fence)
{
	struct mlx5e_set_tls_static_params_wqe *wqe;
	u16 pi, num_wqebbs;

	num_wqebbs = MLX5E_TLS_SET_STATIC_PARAMS_WQEBBS;
	pi = mlx5e_txqsq_get_next_pi(sq, num_wqebbs);
	wqe = MLX5E_TLS_FETCH_SET_STATIC_PARAMS_WQE(sq, pi);
	mlx5e_ktls_build_static_params(wqe, sq->pc, sq->sqn, &priv_tx->crypto_info,
				       priv_tx->tisn,
				       mlx5_crypto_dek_get_id(priv_tx->dek),
				       0, fence, TLS_OFFLOAD_CTX_DIR_TX);
	tx_fill_wi(sq, pi, num_wqebbs, 0, NULL);
	sq->pc += num_wqebbs;
}

static void
post_progress_params(struct mlx5e_txqsq *sq,
		     struct mlx5e_ktls_offload_context_tx *priv_tx,
		     bool fence)
{
	struct mlx5e_set_tls_progress_params_wqe *wqe;
	u16 pi, num_wqebbs;

	num_wqebbs = MLX5E_TLS_SET_PROGRESS_PARAMS_WQEBBS;
	pi = mlx5e_txqsq_get_next_pi(sq, num_wqebbs);
	wqe = MLX5E_TLS_FETCH_SET_PROGRESS_PARAMS_WQE(sq, pi);
	mlx5e_ktls_build_progress_params(wqe, sq->pc, sq->sqn, priv_tx->tisn, fence, 0,
					 TLS_OFFLOAD_CTX_DIR_TX);
	tx_fill_wi(sq, pi, num_wqebbs, 0, NULL);
	sq->pc += num_wqebbs;
}

static void tx_post_fence_nop(struct mlx5e_txqsq *sq)
{
	struct mlx5_wq_cyc *wq = &sq->wq;
	u16 pi = mlx5_wq_cyc_ctr2ix(wq, sq->pc);

	tx_fill_wi(sq, pi, 1, 0, NULL);

	mlx5e_post_nop_fence(wq, sq->sqn, &sq->pc);
}

static void
mlx5e_ktls_tx_post_param_wqes(struct mlx5e_txqsq *sq,
			      struct mlx5e_ktls_offload_context_tx *priv_tx,
			      bool skip_static_post, bool fence_first_post)
{
	bool progress_fence = skip_static_post || !fence_first_post;

	if (!skip_static_post)
		post_static_params(sq, priv_tx, fence_first_post);

	post_progress_params(sq, priv_tx, progress_fence);
	tx_post_fence_nop(sq);
}

struct tx_sync_info {
	u64 rcd_sn;
	u32 sync_len;
	int nr_frags;
	skb_frag_t frags[MAX_SKB_FRAGS];
};

enum mlx5e_ktls_sync_retval {
	MLX5E_KTLS_SYNC_DONE,
	MLX5E_KTLS_SYNC_FAIL,
	MLX5E_KTLS_SYNC_SKIP_NO_DATA,
};

static enum mlx5e_ktls_sync_retval
tx_sync_info_get(struct mlx5e_ktls_offload_context_tx *priv_tx,
		 u32 tcp_seq, int datalen, struct tx_sync_info *info)
{
	struct tls_offload_context_tx *tx_ctx = priv_tx->tx_ctx;
	enum mlx5e_ktls_sync_retval ret = MLX5E_KTLS_SYNC_DONE;
	struct tls_record_info *record;
	int remaining, i = 0;
	unsigned long flags;
	bool ends_before;

	spin_lock_irqsave(&tx_ctx->lock, flags);
	record = tls_get_record(tx_ctx, tcp_seq, &info->rcd_sn);

	if (unlikely(!record)) {
		ret = MLX5E_KTLS_SYNC_FAIL;
		goto out;
	}

	/* There are the following cases:
	 * 1. packet ends before start marker: bypass offload.
	 * 2. packet starts before start marker and ends after it: drop,
	 *    not supported, breaks contract with kernel.
	 * 3. packet ends before tls record info starts: drop,
	 *    this packet was already acknowledged and its record info
	 *    was released.
	 */
	ends_before = before(tcp_seq + datalen - 1, tls_record_start_seq(record));

	if (unlikely(tls_record_is_start_marker(record))) {
		ret = ends_before ? MLX5E_KTLS_SYNC_SKIP_NO_DATA : MLX5E_KTLS_SYNC_FAIL;
		goto out;
	} else if (ends_before) {
		ret = MLX5E_KTLS_SYNC_FAIL;
		goto out;
	}

	info->sync_len = tcp_seq - tls_record_start_seq(record);
	remaining = info->sync_len;
	while (remaining > 0) {
		skb_frag_t *frag = &record->frags[i];

		get_page(skb_frag_page(frag));
		remaining -= skb_frag_size(frag);
		info->frags[i++] = *frag;
	}
	/* reduce the part which will be sent with the original SKB */
	if (remaining < 0)
		skb_frag_size_add(&info->frags[i - 1], remaining);
	info->nr_frags = i;
out:
	spin_unlock_irqrestore(&tx_ctx->lock, flags);
	return ret;
}

static void
tx_post_resync_params(struct mlx5e_txqsq *sq,
		      struct mlx5e_ktls_offload_context_tx *priv_tx,
		      u64 rcd_sn)
{
	__be64 rn_be = cpu_to_be64(rcd_sn);
	bool skip_static_post;
	u16 rec_seq_sz;
	char *rec_seq;

	switch (priv_tx->crypto_info.crypto_info.cipher_type) {
	case TLS_CIPHER_AES_GCM_128: {
		struct tls12_crypto_info_aes_gcm_128 *info = &priv_tx->crypto_info.crypto_info_128;

		rec_seq = info->rec_seq;
		rec_seq_sz = sizeof(info->rec_seq);
		break;
	}
	case TLS_CIPHER_AES_GCM_256: {
		struct tls12_crypto_info_aes_gcm_256 *info = &priv_tx->crypto_info.crypto_info_256;

		rec_seq = info->rec_seq;
		rec_seq_sz = sizeof(info->rec_seq);
		break;
	}
	default:
		WARN_ONCE(1, "Unsupported cipher type %u\n",
			  priv_tx->crypto_info.crypto_info.cipher_type);
		return;
	}

	skip_static_post = !memcmp(rec_seq, &rn_be, rec_seq_sz);
	if (!skip_static_post)
		memcpy(rec_seq, &rn_be, rec_seq_sz);

	mlx5e_ktls_tx_post_param_wqes(sq, priv_tx, skip_static_post, true);
}

static int
tx_post_resync_dump(struct mlx5e_txqsq *sq, skb_frag_t *frag, u32 tisn)
{
	struct mlx5_wqe_ctrl_seg *cseg;
	struct mlx5_wqe_data_seg *dseg;
	struct mlx5e_dump_wqe *wqe;
	dma_addr_t dma_addr = 0;
	u16 ds_cnt;
	int fsz;
	u16 pi;

	BUILD_BUG_ON(MLX5E_KTLS_DUMP_WQEBBS != 1);
	pi = mlx5_wq_cyc_ctr2ix(&sq->wq, sq->pc);
	wqe = MLX5E_TLS_FETCH_DUMP_WQE(sq, pi);

	ds_cnt = sizeof(*wqe) / MLX5_SEND_WQE_DS;

	cseg = &wqe->ctrl;
	dseg = &wqe->data;

	cseg->opmod_idx_opcode = cpu_to_be32((sq->pc << 8)  | MLX5_OPCODE_DUMP);
	cseg->qpn_ds           = cpu_to_be32((sq->sqn << 8) | ds_cnt);
	cseg->tis_tir_num      = cpu_to_be32(tisn << 8);

	fsz = skb_frag_size(frag);
	dma_addr = skb_frag_dma_map(sq->pdev, frag, 0, fsz,
				    DMA_TO_DEVICE);
	if (unlikely(dma_mapping_error(sq->pdev, dma_addr)))
		return -ENOMEM;

	dseg->addr       = cpu_to_be64(dma_addr);
	dseg->lkey       = sq->mkey_be;
	dseg->byte_count = cpu_to_be32(fsz);
	mlx5e_dma_push(sq, dma_addr, fsz, MLX5E_DMA_MAP_PAGE);

	tx_fill_wi(sq, pi, MLX5E_KTLS_DUMP_WQEBBS, fsz, skb_frag_page(frag));
	sq->pc += MLX5E_KTLS_DUMP_WQEBBS;

	return 0;
}

void mlx5e_ktls_tx_handle_resync_dump_comp(struct mlx5e_txqsq *sq,
					   struct mlx5e_tx_wqe_info *wi,
					   u32 *dma_fifo_cc)
{
	struct mlx5e_sq_stats *stats;
	struct mlx5e_sq_dma *dma;

	dma = mlx5e_dma_get(sq, (*dma_fifo_cc)++);
	stats = sq->stats;

	mlx5e_tx_dma_unmap(sq->pdev, dma);
	put_page(wi->resync_dump_frag_page);
	stats->tls_dump_packets++;
	stats->tls_dump_bytes += wi->num_bytes;
}

static enum mlx5e_ktls_sync_retval
mlx5e_ktls_tx_handle_ooo(struct mlx5e_ktls_offload_context_tx *priv_tx,
			 struct mlx5e_txqsq *sq,
			 int datalen,
			 u32 seq)
{
	enum mlx5e_ktls_sync_retval ret;
	struct tx_sync_info info = {};
	int i;

	ret = tx_sync_info_get(priv_tx, seq, datalen, &info);
	if (unlikely(ret != MLX5E_KTLS_SYNC_DONE))
		/* We might get here with ret == FAIL if a retransmission
		 * reaches the driver after the relevant record is acked.
		 * It should be safe to drop the packet in this case
		 */
		return ret;

	tx_post_resync_params(sq, priv_tx, info.rcd_sn);

	for (i = 0; i < info.nr_frags; i++) {
		unsigned int orig_fsz, frag_offset = 0, n = 0;
		skb_frag_t *f = &info.frags[i];

		orig_fsz = skb_frag_size(f);

		do {
			unsigned int fsz;

			n++;
			fsz = min_t(unsigned int, sq->hw_mtu, orig_fsz - frag_offset);
			skb_frag_size_set(f, fsz);
			if (tx_post_resync_dump(sq, f, priv_tx->tisn)) {
				page_ref_add(skb_frag_page(f), n - 1);
				goto err_out;
			}

			skb_frag_off_add(f, fsz);
			frag_offset += fsz;
		} while (frag_offset < orig_fsz);

		page_ref_add(skb_frag_page(f), n - 1);
	}

	return MLX5E_KTLS_SYNC_DONE;

err_out:
	for (; i < info.nr_frags; i++)
		/* The put_page() here undoes the page ref obtained in tx_sync_info_get().
		 * Page refs obtained for the DUMP WQEs above (by page_ref_add) will be
		 * released only upon their completions (or in mlx5e_free_txqsq_descs,
		 * if channel closes).
		 */
		put_page(skb_frag_page(&info.frags[i]));

	return MLX5E_KTLS_SYNC_FAIL;
}

bool mlx5e_ktls_handle_tx_skb(struct net_device *netdev, struct mlx5e_txqsq *sq,
			      struct sk_buff *skb,
			      struct mlx5e_accel_tx_tls_state *state)
{
	struct mlx5e_ktls_offload_context_tx *priv_tx;
	struct mlx5e_sq_stats *stats = sq->stats;
	struct net_device *tls_netdev;
	struct tls_context *tls_ctx;
	int datalen;
	u32 seq;

	datalen = skb->len - skb_tcp_all_headers(skb);
	if (!datalen)
		return true;

	mlx5e_tx_mpwqe_ensure_complete(sq);

	tls_ctx = tls_get_ctx(skb->sk);
	tls_netdev = rcu_dereference_bh(tls_ctx->netdev);
	/* Don't WARN on NULL: if tls_device_down is running in parallel,
	 * netdev might become NULL, even if tls_is_skb_tx_device_offloaded was
	 * true. Rather continue processing this packet.
	 */
	if (WARN_ON_ONCE(tls_netdev && tls_netdev != netdev))
		goto err_out;

	priv_tx = mlx5e_get_ktls_tx_priv_ctx(tls_ctx);

	if (unlikely(mlx5e_ktls_tx_offload_test_and_clear_pending(priv_tx)))
		mlx5e_ktls_tx_post_param_wqes(sq, priv_tx, false, false);

	seq = ntohl(tcp_hdr(skb)->seq);
	if (unlikely(priv_tx->expected_seq != seq)) {
		enum mlx5e_ktls_sync_retval ret =
			mlx5e_ktls_tx_handle_ooo(priv_tx, sq, datalen, seq);

		stats->tls_ooo++;

		switch (ret) {
		case MLX5E_KTLS_SYNC_DONE:
			break;
		case MLX5E_KTLS_SYNC_SKIP_NO_DATA:
			stats->tls_skip_no_sync_data++;
			if (likely(!skb->decrypted))
				goto out;
			WARN_ON_ONCE(1);
			goto err_out;
		case MLX5E_KTLS_SYNC_FAIL:
			stats->tls_drop_no_sync_data++;
			goto err_out;
		}
	}

	priv_tx->expected_seq = seq + datalen;

	state->tls_tisn = priv_tx->tisn;

	stats->tls_encrypted_packets += skb_is_gso(skb) ? skb_shinfo(skb)->gso_segs : 1;
	stats->tls_encrypted_bytes   += datalen;

out:
	return true;

err_out:
	dev_kfree_skb_any(skb);
	return false;
}

static void mlx5e_tls_tx_debugfs_init(struct mlx5e_tls *tls,
				      struct dentry *dfs_root)
{
	if (IS_ERR_OR_NULL(dfs_root))
		return;

	tls->debugfs.dfs_tx = debugfs_create_dir("tx", dfs_root);

	debugfs_create_size_t("pool_size", 0400, tls->debugfs.dfs_tx,
			      &tls->tx_pool->size);
}

int mlx5e_ktls_init_tx(struct mlx5e_priv *priv)
{
	struct mlx5_crypto_dek_pool *dek_pool;
	struct mlx5e_tls *tls = priv->tls;
	int err;

	if (!mlx5e_is_ktls_device(priv->mdev))
		return 0;

	/* DEK pool could be used by either or both of TX and RX. But we have to
	 * put the creation here to avoid syndrome when doing devlink reload.
	 */
	dek_pool = mlx5_crypto_dek_pool_create(priv->mdev, MLX5_ACCEL_OBJ_TLS_KEY);
	if (IS_ERR(dek_pool))
		return PTR_ERR(dek_pool);
	tls->dek_pool = dek_pool;

	if (!mlx5e_is_ktls_tx(priv->mdev))
		return 0;

	priv->tls->tx_pool = mlx5e_tls_tx_pool_init(priv->mdev, &priv->tls->sw_stats);
	if (!priv->tls->tx_pool) {
		err = -ENOMEM;
		goto err_tx_pool_init;
	}

	mlx5e_tls_tx_debugfs_init(tls, tls->debugfs.dfs);

	return 0;

err_tx_pool_init:
	mlx5_crypto_dek_pool_destroy(dek_pool);
	return err;
}

void mlx5e_ktls_cleanup_tx(struct mlx5e_priv *priv)
{
	if (!mlx5e_is_ktls_tx(priv->mdev))
		goto dek_pool_destroy;

	debugfs_remove_recursive(priv->tls->debugfs.dfs_tx);
	priv->tls->debugfs.dfs_tx = NULL;

	mlx5e_tls_tx_pool_cleanup(priv->tls->tx_pool);
	priv->tls->tx_pool = NULL;

dek_pool_destroy:
	if (mlx5e_is_ktls_device(priv->mdev))
		mlx5_crypto_dek_pool_destroy(priv->tls->dek_pool);
}