Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[platform/kernel/linux-rpi.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
56         /*
57          * Which device to use if multiple devices are available TODO
58          * May be select the device based on round robin. One session
59          * must go to the same device to maintain the ordering.
60          */
61         mutex_lock(&dev_mutex); /* TODO ? */
62         u_ctx = list_first_entry(&uld_ctx_list, struct uld_ctx, entry);
63         if (!u_ctx) {
64                 mutex_unlock(&dev_mutex);
65                 return -ENXIO;
66         }
67
68         *dev = u_ctx->dev;
69         mutex_unlock(&dev_mutex);
70         return 0;
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                 req->complete(req, error_status);
119         } else {
120                 pr_err("Incorrect request address from the firmware\n");
121                 return -EFAULT;
122         }
123         return 0;
124 }
125
126 int chcr_send_wr(struct sk_buff *skb)
127 {
128         return cxgb4_crypto_send(skb->dev, skb);
129 }
130
131 static void *chcr_uld_add(const struct cxgb4_lld_info *lld)
132 {
133         struct uld_ctx *u_ctx;
134
135         /* Create the device and add it in the device list */
136         u_ctx = kzalloc(sizeof(*u_ctx), GFP_KERNEL);
137         if (!u_ctx) {
138                 u_ctx = ERR_PTR(-ENOMEM);
139                 goto out;
140         }
141         u_ctx->lldi = *lld;
142         mutex_lock(&dev_mutex);
143         list_add_tail(&u_ctx->entry, &uld_ctx_list);
144         mutex_unlock(&dev_mutex);
145 out:
146         return u_ctx;
147 }
148
149 int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
150                         const struct pkt_gl *pgl)
151 {
152         struct uld_ctx *u_ctx = (struct uld_ctx *)handle;
153         struct chcr_dev *dev = u_ctx->dev;
154         const struct cpl_act_establish *rpl = (struct cpl_act_establish
155                                                *)rsp;
156
157         if (rpl->ot.opcode != CPL_FW6_PLD) {
158                 pr_err("Unsupported opcode\n");
159                 return 0;
160         }
161
162         if (!pgl)
163                 work_handlers[rpl->ot.opcode](dev, (unsigned char *)&rsp[1]);
164         else
165                 work_handlers[rpl->ot.opcode](dev, pgl->va);
166         return 0;
167 }
168
169 static int chcr_uld_state_change(void *handle, enum cxgb4_state state)
170 {
171         struct uld_ctx *u_ctx = handle;
172         int ret = 0;
173
174         switch (state) {
175         case CXGB4_STATE_UP:
176                 if (!u_ctx->dev) {
177                         ret = chcr_dev_add(u_ctx);
178                         if (ret != 0)
179                                 return ret;
180                 }
181                 if (atomic_read(&dev_count) == 1)
182                         ret = start_crypto();
183                 break;
184
185         case CXGB4_STATE_DETACH:
186                 if (u_ctx->dev) {
187                         mutex_lock(&dev_mutex);
188                         chcr_dev_remove(u_ctx);
189                         mutex_unlock(&dev_mutex);
190                 }
191                 if (!atomic_read(&dev_count))
192                         stop_crypto();
193                 break;
194
195         case CXGB4_STATE_START_RECOVERY:
196         case CXGB4_STATE_DOWN:
197         default:
198                 break;
199         }
200         return ret;
201 }
202
203 static int __init chcr_crypto_init(void)
204 {
205         if (cxgb4_register_uld(CXGB4_ULD_CRYPTO, &chcr_uld_info)) {
206                 pr_err("ULD register fail: No chcr crypto support in cxgb4");
207                 return -1;
208         }
209
210         return 0;
211 }
212
213 static void __exit chcr_crypto_exit(void)
214 {
215         struct uld_ctx *u_ctx, *tmp;
216
217         if (atomic_read(&dev_count))
218                 stop_crypto();
219
220         /* Remove all devices from list */
221         mutex_lock(&dev_mutex);
222         list_for_each_entry_safe(u_ctx, tmp, &uld_ctx_list, entry) {
223                 if (u_ctx->dev)
224                         chcr_dev_remove(u_ctx);
225                 kfree(u_ctx);
226         }
227         mutex_unlock(&dev_mutex);
228         cxgb4_unregister_uld(CXGB4_ULD_CRYPTO);
229 }
230
231 module_init(chcr_crypto_init);
232 module_exit(chcr_crypto_exit);
233
234 MODULE_DESCRIPTION("Crypto Co-processor for Chelsio Terminator cards.");
235 MODULE_LICENSE("GPL");
236 MODULE_AUTHOR("Chelsio Communications");
237 MODULE_VERSION(DRV_VERSION);