crypto: chcr - Add ctr mode and process large sg entries for cipher
[linux-2.6-block.git] / drivers / crypto / chelsio / chcr_core.c
1 /**
2  * This file is part of the Chelsio T4/T5/T6 Ethernet driver for Linux.
3  *
4  * Copyright (C) 2011-2016 Chelsio Communications.  All rights reserved.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation.
9  *
10  * Written and Maintained by:
11  * Manoj Malviya (manojmalviya@chelsio.com)
12  * Atul Gupta (atul.gupta@chelsio.com)
13  * Jitendra Lulla (jlulla@chelsio.com)
14  * Yeshaswi M R Gowda (yeshaswi@chelsio.com)
15  * Harsh Jain (harsh@chelsio.com)
16  */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/skbuff.h>
21
22 #include <crypto/aes.h>
23 #include <crypto/hash.h>
24
25 #include "t4_msg.h"
26 #include "chcr_core.h"
27 #include "cxgb4_uld.h"
28
29 static LIST_HEAD(uld_ctx_list);
30 static DEFINE_MUTEX(dev_mutex);
31 static atomic_t dev_count;
32
33 typedef int (*chcr_handler_func)(struct chcr_dev *dev, unsigned char *input);
34 static int cpl_fw6_pld_handler(struct chcr_dev *dev, unsigned char *input);
35 static void *chcr_uld_add(const struct cxgb4_lld_info *lld);
36 static int chcr_uld_state_change(void *handle, enum cxgb4_state state);
37
38 static chcr_handler_func work_handlers[NUM_CPL_CMDS] = {
39         [CPL_FW6_PLD] = cpl_fw6_pld_handler,
40 };
41
42 static struct cxgb4_uld_info chcr_uld_info = {
43         .name = DRV_MODULE_NAME,
44         .nrxq = MAX_ULD_QSETS,
45         .ntxq = MAX_ULD_QSETS,
46         .rxq_size = 1024,
47         .add = chcr_uld_add,
48         .state_change = chcr_uld_state_change,
49         .rx_handler = chcr_uld_rx_handler,
50 };
51
52 int assign_chcr_device(struct chcr_dev **dev)
53 {
54         struct uld_ctx *u_ctx;
55         int ret = -ENXIO;
56
57         /*
58          * Which device to use if multiple devices are available TODO
59          * May be select the device based on round robin. One session
60          * must go to the same device to maintain the ordering.
61          */
62         mutex_lock(&dev_mutex); /* TODO ? */
63         list_for_each_entry(u_ctx, &uld_ctx_list, entry)
64                 if (u_ctx->dev) {
65                         *dev = u_ctx->dev;
66                         ret = 0;
67                         break;
68         }
69         mutex_unlock(&dev_mutex);
70         return ret;
71 }
72
73 static int chcr_dev_add(struct uld_ctx *u_ctx)
74 {
75         struct chcr_dev *dev;
76
77         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
78         if (!dev)
79                 return -ENXIO;
80
81         spin_lock_init(&dev->lock_chcr_dev);
82         u_ctx->dev = dev;
83         dev->u_ctx = u_ctx;
84         atomic_inc(&dev_count);
85         return 0;
86 }
87
88 static int chcr_dev_remove(struct uld_ctx *u_ctx)
89 {
90         kfree(u_ctx->dev);
91         u_ctx->dev = NULL;
92         atomic_dec(&dev_count);
93         return 0;
94 }
95
96 static int cpl_fw6_pld_handler(struct chcr_dev *dev,
97                                unsigned char *input)
98 {
99         struct crypto_async_request *req;
100         struct cpl_fw6_pld *fw6_pld;
101         u32 ack_err_status = 0;
102         int error_status = 0;
103
104         fw6_pld = (struct cpl_fw6_pld *)input;
105         req = (struct crypto_async_request *)(uintptr_t)be64_to_cpu(
106                                                     fw6_pld->data[1]);
107
108         ack_err_status =
109                 ntohl(*(__be32 *)((unsigned char *)&fw6_pld->data[0] + 4));
110         if (ack_err_status) {
111                 if (CHK_MAC_ERR_BIT(ack_err_status) ||
112                     CHK_PAD_ERR_BIT(ack_err_status))
113                         error_status = -EBADMSG;
114         }
115         /* call completion callback with failure status */
116         if (req) {
117                 error_status = chcr_handle_resp(req, input, error_status);
118         } else {
119                 pr_err("Incorrect request address from the firmware\n");
120                 return -EFAULT;
121         }
122         return 0;
123 }
124
125 int chcr_send_wr(struct sk_buff *skb)
126 {
127         return cxgb4_crypto_send(skb->dev, skb);
128 }
129
130 static void *chcr_uld_add(const struct cxgb4_lld_info *lld)
131 {
132         struct uld_ctx *u_ctx;
133
134         /* Create the device and add it in the device list */
135         u_ctx = kzalloc(sizeof(*u_ctx), GFP_KERNEL);
136         if (!u_ctx) {
137                 u_ctx = ERR_PTR(-ENOMEM);
138                 goto out;
139         }
140         u_ctx->lldi = *lld;
141         mutex_lock(&dev_mutex);
142         list_add_tail(&u_ctx->entry, &uld_ctx_list);
143         mutex_unlock(&dev_mutex);
144 out:
145         return u_ctx;
146 }
147
148 int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
149                         const struct pkt_gl *pgl)
150 {
151         struct uld_ctx *u_ctx = (struct uld_ctx *)handle;
152         struct chcr_dev *dev = u_ctx->dev;
153         const struct cpl_fw6_pld *rpl = (struct cpl_fw6_pld *)rsp;
154
155         if (rpl->opcode != CPL_FW6_PLD) {
156                 pr_err("Unsupported opcode\n");
157                 return 0;
158         }
159
160         if (!pgl)
161                 work_handlers[rpl->opcode](dev, (unsigned char *)&rsp[1]);
162         else
163                 work_handlers[rpl->opcode](dev, pgl->va);
164         return 0;
165 }
166
167 static int chcr_uld_state_change(void *handle, enum cxgb4_state state)
168 {
169         struct uld_ctx *u_ctx = handle;
170         int ret = 0;
171
172         switch (state) {
173         case CXGB4_STATE_UP:
174                 if (!u_ctx->dev) {
175                         ret = chcr_dev_add(u_ctx);
176                         if (ret != 0)
177                                 return ret;
178                 }
179                 if (atomic_read(&dev_count) == 1)
180                         ret = start_crypto();
181                 break;
182
183         case CXGB4_STATE_DETACH:
184                 if (u_ctx->dev) {
185                         mutex_lock(&dev_mutex);
186                         chcr_dev_remove(u_ctx);
187                         mutex_unlock(&dev_mutex);
188                 }
189                 if (!atomic_read(&dev_count))
190                         stop_crypto();
191                 break;
192
193         case CXGB4_STATE_START_RECOVERY:
194         case CXGB4_STATE_DOWN:
195         default:
196                 break;
197         }
198         return ret;
199 }
200
201 static int __init chcr_crypto_init(void)
202 {
203         if (cxgb4_register_uld(CXGB4_ULD_CRYPTO, &chcr_uld_info))
204                 pr_err("ULD register fail: No chcr crypto support in cxgb4");
205
206         return 0;
207 }
208
209 static void __exit chcr_crypto_exit(void)
210 {
211         struct uld_ctx *u_ctx, *tmp;
212
213         if (atomic_read(&dev_count))
214                 stop_crypto();
215
216         /* Remove all devices from list */
217         mutex_lock(&dev_mutex);
218         list_for_each_entry_safe(u_ctx, tmp, &uld_ctx_list, entry) {
219                 if (u_ctx->dev)
220                         chcr_dev_remove(u_ctx);
221                 kfree(u_ctx);
222         }
223         mutex_unlock(&dev_mutex);
224         cxgb4_unregister_uld(CXGB4_ULD_CRYPTO);
225 }
226
227 module_init(chcr_crypto_init);
228 module_exit(chcr_crypto_exit);
229
230 MODULE_DESCRIPTION("Crypto Co-processor for Chelsio Terminator cards.");
231 MODULE_LICENSE("GPL");
232 MODULE_AUTHOR("Chelsio Communications");
233 MODULE_VERSION(DRV_VERSION);