chcr_core.h

/*
 * This file is part of the Chelsio T6 Crypto driver for Linux.
 *
 * Copyright (c) 2003-2016 Chelsio Communications, Inc. 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 __CHCR_CORE_H__
#define __CHCR_CORE_H__

#include <crypto/algapi.h>
#include <net/tls.h>
#include "t4_hw.h"
#include "cxgb4.h"
#include "t4_msg.h"
#include "cxgb4_uld.h"

#define DRV_MODULE_NAME "chcr"
#define DRV_DESC "Chelsio T6 Crypto Co-processor Driver"

#define MAX_PENDING_REQ_TO_HW 20
#define CHCR_TEST_RESPONSE_TIMEOUT 1000
#define WQ_DETACH_TM	(msecs_to_jiffies(50))
#define PAD_ERROR_BIT		1
#define CHK_PAD_ERR_BIT(x)	(((x) >> PAD_ERROR_BIT) & 1)

#define MAC_ERROR_BIT		0
#define CHK_MAC_ERR_BIT(x)	(((x) >> MAC_ERROR_BIT) & 1)
#define MAX_SALT                4
#define CIP_WR_MIN_LEN (sizeof(struct chcr_wr) + \
		    sizeof(struct cpl_rx_phys_dsgl) + \
		    sizeof(struct ulptx_sgl) + 16) //IV

#define HASH_WR_MIN_LEN (sizeof(struct chcr_wr) + \
			DUMMY_BYTES + \
		    sizeof(struct ulptx_sgl))
struct uld_ctx;

struct _key_ctx {
	__be32 ctx_hdr;
	u8 salt[MAX_SALT];
	__be64 iv_to_auth;
	unsigned char key[];
};

#define WQ_RETRY	5
struct chcr_driver_data {
	struct list_head act_dev;
	struct list_head inact_dev;
	atomic_t dev_count;
	struct mutex drv_mutex;
	struct uld_ctx *last_dev;
};

enum chcr_state {
	CHCR_INIT = 0,
	CHCR_ATTACH,
	CHCR_DETACH,
};
struct chcr_wr {
	struct fw_crypto_lookaside_wr wreq;
	struct ulp_txpkt ulptx;
	struct ulptx_idata sc_imm;
	struct cpl_tx_sec_pdu sec_cpl;
	struct _key_ctx key_ctx;
};

struct chcr_dev {
	spinlock_t lock_chcr_dev;
	enum chcr_state state;
	atomic_t inflight;
	int wqretry;
	struct delayed_work detach_work;
	struct completion detach_comp;
};

struct uld_ctx {
	struct list_head entry;
	struct cxgb4_lld_info lldi;
	struct chcr_dev dev;
};

/*
 *      sgl_len - calculates the size of an SGL of the given capacity
 *      @n: the number of SGL entries
 *      Calculates the number of flits needed for a scatter/gather list that
 *      can hold the given number of entries.
 */
static inline unsigned int sgl_len(unsigned int n)
{
	n--;
	return (3 * n) / 2 + (n & 1) + 2;
}

static inline void *padap(struct chcr_dev *dev)
{
	struct uld_ctx *u_ctx = container_of(dev, struct uld_ctx, dev);

	return pci_get_drvdata(u_ctx->lldi.pdev);
}

struct uld_ctx *assign_chcr_device(void);
int chcr_send_wr(struct sk_buff *skb);
int start_crypto(void);
int stop_crypto(void);
int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
			const struct pkt_gl *pgl);
int chcr_handle_resp(struct crypto_async_request *req, unsigned char *input,
		     int err);
#endif /* __CHCR_CORE_H__ */