1 /*
2  * This file is part of the Chelsio T6 Crypto driver for Linux.
3  *
4  * Copyright (c) 2003-2016 Chelsio Communications, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  *
34  */
35 
36 #ifndef __CHCR_CORE_H__
37 #define __CHCR_CORE_H__
38 
39 #include <crypto/algapi.h>
40 #include <net/tls.h>
41 #include "t4_hw.h"
42 #include "cxgb4.h"
43 #include "t4_msg.h"
44 #include "cxgb4_uld.h"
45 
46 #define DRV_MODULE_NAME "chcr"
47 #define DRV_DESC "Chelsio T6 Crypto Co-processor Driver"
48 
49 #define MAX_PENDING_REQ_TO_HW 20
50 #define CHCR_TEST_RESPONSE_TIMEOUT 1000
51 #define WQ_DETACH_TM	(msecs_to_jiffies(50))
52 #define PAD_ERROR_BIT		1
53 #define CHK_PAD_ERR_BIT(x)	(((x) >> PAD_ERROR_BIT) & 1)
54 
55 #define MAC_ERROR_BIT		0
56 #define CHK_MAC_ERR_BIT(x)	(((x) >> MAC_ERROR_BIT) & 1)
57 #define MAX_SALT                4
58 #define CIP_WR_MIN_LEN (sizeof(struct chcr_wr) + \
59 		    sizeof(struct cpl_rx_phys_dsgl) + \
60 		    sizeof(struct ulptx_sgl) + 16) //IV
61 
62 #define HASH_WR_MIN_LEN (sizeof(struct chcr_wr) + \
63 			DUMMY_BYTES + \
64 		    sizeof(struct ulptx_sgl))
65 struct uld_ctx;
66 
67 struct _key_ctx {
68 	__be32 ctx_hdr;
69 	u8 salt[MAX_SALT];
70 	__be64 iv_to_auth;
71 	unsigned char key[];
72 };
73 
74 #define WQ_RETRY	5
75 struct chcr_driver_data {
76 	struct list_head act_dev;
77 	struct list_head inact_dev;
78 	atomic_t dev_count;
79 	struct mutex drv_mutex;
80 	struct uld_ctx *last_dev;
81 };
82 
83 enum chcr_state {
84 	CHCR_INIT = 0,
85 	CHCR_ATTACH,
86 	CHCR_DETACH,
87 };
88 struct chcr_wr {
89 	struct fw_crypto_lookaside_wr wreq;
90 	struct ulp_txpkt ulptx;
91 	struct ulptx_idata sc_imm;
92 	struct cpl_tx_sec_pdu sec_cpl;
93 	struct _key_ctx key_ctx;
94 };
95 
96 struct chcr_dev {
97 	spinlock_t lock_chcr_dev;
98 	enum chcr_state state;
99 	atomic_t inflight;
100 	int wqretry;
101 	struct delayed_work detach_work;
102 	struct completion detach_comp;
103 };
104 
105 struct uld_ctx {
106 	struct list_head entry;
107 	struct cxgb4_lld_info lldi;
108 	struct chcr_dev dev;
109 };
110 
111 /*
112  *      sgl_len - calculates the size of an SGL of the given capacity
113  *      @n: the number of SGL entries
114  *      Calculates the number of flits needed for a scatter/gather list that
115  *      can hold the given number of entries.
116  */
sgl_len(unsigned int n)117 static inline unsigned int sgl_len(unsigned int n)
118 {
119 	n--;
120 	return (3 * n) / 2 + (n & 1) + 2;
121 }
122 
padap(struct chcr_dev * dev)123 static inline void *padap(struct chcr_dev *dev)
124 {
125 	struct uld_ctx *u_ctx = container_of(dev, struct uld_ctx, dev);
126 
127 	return pci_get_drvdata(u_ctx->lldi.pdev);
128 }
129 
130 struct uld_ctx *assign_chcr_device(void);
131 int chcr_send_wr(struct sk_buff *skb);
132 int start_crypto(void);
133 int stop_crypto(void);
134 int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
135 			const struct pkt_gl *pgl);
136 int chcr_uld_tx_handler(struct sk_buff *skb, struct net_device *dev);
137 int chcr_handle_resp(struct crypto_async_request *req, unsigned char *input,
138 		     int err);
139 #endif /* __CHCR_CORE_H__ */
140