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 "t4_hw.h"
41 #include "cxgb4.h"
42 #include "t4_msg.h"
43 #include "cxgb4_uld.h"
44 
45 #define DRV_MODULE_NAME "chcr"
46 #define DRV_VERSION "1.0.0.0"
47 
48 #define MAX_PENDING_REQ_TO_HW 20
49 #define CHCR_TEST_RESPONSE_TIMEOUT 1000
50 
51 #define PAD_ERROR_BIT		1
52 #define CHK_PAD_ERR_BIT(x)	(((x) >> PAD_ERROR_BIT) & 1)
53 
54 #define MAC_ERROR_BIT		0
55 #define CHK_MAC_ERR_BIT(x)	(((x) >> MAC_ERROR_BIT) & 1)
56 #define MAX_SALT                4
57 #define WR_MIN_LEN (sizeof(struct chcr_wr) + \
58 		    sizeof(struct cpl_rx_phys_dsgl) + \
59 		    sizeof(struct ulptx_sgl))
60 
61 #define padap(dev) pci_get_drvdata(dev->u_ctx->lldi.pdev)
62 
63 struct uld_ctx;
64 
65 struct _key_ctx {
66 	__be32 ctx_hdr;
67 	u8 salt[MAX_SALT];
68 	__be64 reserverd;
69 	unsigned char key[0];
70 };
71 
72 struct chcr_wr {
73 	struct fw_crypto_lookaside_wr wreq;
74 	struct ulp_txpkt ulptx;
75 	struct ulptx_idata sc_imm;
76 	struct cpl_tx_sec_pdu sec_cpl;
77 	struct _key_ctx key_ctx;
78 };
79 
80 struct chcr_dev {
81 	spinlock_t lock_chcr_dev;
82 	struct uld_ctx *u_ctx;
83 	unsigned char tx_channel_id;
84 	unsigned char rx_channel_id;
85 };
86 
87 struct uld_ctx {
88 	struct list_head entry;
89 	struct cxgb4_lld_info lldi;
90 	struct chcr_dev *dev;
91 };
92 
93 struct chcr_ipsec_req {
94 	struct ulp_txpkt ulptx;
95 	struct ulptx_idata sc_imm;
96 	struct cpl_tx_sec_pdu sec_cpl;
97 	struct _key_ctx key_ctx;
98 };
99 
100 struct chcr_ipsec_wr {
101 	struct fw_ulptx_wr wreq;
102 	struct chcr_ipsec_req req;
103 };
104 
105 struct ipsec_sa_entry {
106 	int hmac_ctrl;
107 	unsigned int enckey_len;
108 	unsigned int kctx_len;
109 	unsigned int authsize;
110 	__be32 key_ctx_hdr;
111 	char salt[MAX_SALT];
112 	char key[2 * AES_MAX_KEY_SIZE];
113 };
114 
115 /*
116  *      sgl_len - calculates the size of an SGL of the given capacity
117  *      @n: the number of SGL entries
118  *      Calculates the number of flits needed for a scatter/gather list that
119  *      can hold the given number of entries.
120  */
121 static inline unsigned int sgl_len(unsigned int n)
122 {
123 	n--;
124 	return (3 * n) / 2 + (n & 1) + 2;
125 }
126 
127 struct uld_ctx *assign_chcr_device(void);
128 int chcr_send_wr(struct sk_buff *skb);
129 int start_crypto(void);
130 int stop_crypto(void);
131 int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
132 			const struct pkt_gl *pgl);
133 int chcr_uld_tx_handler(struct sk_buff *skb, struct net_device *dev);
134 int chcr_handle_resp(struct crypto_async_request *req, unsigned char *input,
135 		     int err);
136 int chcr_ipsec_xmit(struct sk_buff *skb, struct net_device *dev);
137 void chcr_add_xfrmops(const struct cxgb4_lld_info *lld);
138 #endif /* __CHCR_CORE_H__ */
139