Merge tag 'powerpc-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc...
[cascardo/linux.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         .rxq_size = 1024,
46         .add = chcr_uld_add,
47         .state_change = chcr_uld_state_change,
48         .rx_handler = chcr_uld_rx_handler,
49 };
50
51 int assign_chcr_device(struct chcr_dev **dev)
52 {
53         struct uld_ctx *u_ctx;
54
55         /*
56          * Which device to use if multiple devices are available TODO
57          * May be select the device based on round robin. One session
58          * must go to the same device to maintain the ordering.
59          */
60         mutex_lock(&dev_mutex); /* TODO ? */
61         u_ctx = list_first_entry(&uld_ctx_list, struct uld_ctx, entry);
62         if (!u_ctx) {
63                 mutex_unlock(&dev_mutex);
64                 return -ENXIO;
65         }
66
67         *dev = u_ctx->dev;
68         mutex_unlock(&dev_mutex);
69         return 0;
70 }
71
72 static int chcr_dev_add(struct uld_ctx *u_ctx)
73 {
74         struct chcr_dev *dev;
75
76         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
77         if (!dev)
78                 return -ENXIO;
79
80         spin_lock_init(&dev->lock_chcr_dev);
81         u_ctx->dev = dev;
82         dev->u_ctx = u_ctx;
83         atomic_inc(&dev_count);
84         return 0;
85 }
86
87 static int chcr_dev_remove(struct uld_ctx *u_ctx)
88 {
89         kfree(u_ctx->dev);
90         u_ctx->dev = NULL;
91         atomic_dec(&dev_count);
92         return 0;
93 }
94
95 static int cpl_fw6_pld_handler(struct chcr_dev *dev,
96                                unsigned char *input)
97 {
98         struct crypto_async_request *req;
99         struct cpl_fw6_pld *fw6_pld;
100         u32 ack_err_status = 0;
101         int error_status = 0;
102
103         fw6_pld = (struct cpl_fw6_pld *)input;
104         req = (struct crypto_async_request *)(uintptr_t)be64_to_cpu(
105                                                     fw6_pld->data[1]);
106
107         ack_err_status =
108                 ntohl(*(__be32 *)((unsigned char *)&fw6_pld->data[0] + 4));
109         if (ack_err_status) {
110                 if (CHK_MAC_ERR_BIT(ack_err_status) ||
111                     CHK_PAD_ERR_BIT(ack_err_status))
112                         error_status = -EINVAL;
113         }
114         /* call completion callback with failure status */
115         if (req) {
116                 if (!chcr_handle_resp(req, input, error_status))
117                         req->complete(req, error_status);
118                 else
119                         return -EINVAL;
120         } else {
121                 pr_err("Incorrect request address from the firmware\n");
122                 return -EFAULT;
123         }
124         return 0;
125 }
126
127 int chcr_send_wr(struct sk_buff *skb)
128 {
129         return cxgb4_ofld_send(skb->dev, skb);
130 }
131
132 static void *chcr_uld_add(const struct cxgb4_lld_info *lld)
133 {
134         struct uld_ctx *u_ctx;
135
136         /* Create the device and add it in the device list */
137         u_ctx = kzalloc(sizeof(*u_ctx), GFP_KERNEL);
138         if (!u_ctx) {
139                 u_ctx = ERR_PTR(-ENOMEM);
140                 goto out;
141         }
142         u_ctx->lldi = *lld;
143         mutex_lock(&dev_mutex);
144         list_add_tail(&u_ctx->entry, &uld_ctx_list);
145         mutex_unlock(&dev_mutex);
146 out:
147         return u_ctx;
148 }
149
150 int chcr_uld_rx_handler(void *handle, const __be64 *rsp,
151                         const struct pkt_gl *pgl)
152 {
153         struct uld_ctx *u_ctx = (struct uld_ctx *)handle;
154         struct chcr_dev *dev = u_ctx->dev;
155         const struct cpl_act_establish *rpl = (struct cpl_act_establish
156                                                *)rsp;
157
158         if (rpl->ot.opcode != CPL_FW6_PLD) {
159                 pr_err("Unsupported opcode\n");
160                 return 0;
161         }
162
163         if (!pgl)
164                 work_handlers[rpl->ot.opcode](dev, (unsigned char *)&rsp[1]);
165         else
166                 work_handlers[rpl->ot.opcode](dev, pgl->va);
167         return 0;
168 }
169
170 static int chcr_uld_state_change(void *handle, enum cxgb4_state state)
171 {
172         struct uld_ctx *u_ctx = handle;
173         int ret = 0;
174
175         switch (state) {
176         case CXGB4_STATE_UP:
177                 if (!u_ctx->dev) {
178                         ret = chcr_dev_add(u_ctx);
179                         if (ret != 0)
180                                 return ret;
181                 }
182                 if (atomic_read(&dev_count) == 1)
183                         ret = start_crypto();
184                 break;
185
186         case CXGB4_STATE_DETACH:
187                 if (u_ctx->dev) {
188                         mutex_lock(&dev_mutex);
189                         chcr_dev_remove(u_ctx);
190                         mutex_unlock(&dev_mutex);
191                 }
192                 if (!atomic_read(&dev_count))
193                         stop_crypto();
194                 break;
195
196         case CXGB4_STATE_START_RECOVERY:
197         case CXGB4_STATE_DOWN:
198         default:
199                 break;
200         }
201         return ret;
202 }
203
204 static int __init chcr_crypto_init(void)
205 {
206         if (cxgb4_register_uld(CXGB4_ULD_CRYPTO, &chcr_uld_info)) {
207                 pr_err("ULD register fail: No chcr crypto support in cxgb4");
208                 return -1;
209         }
210
211         return 0;
212 }
213
214 static void __exit chcr_crypto_exit(void)
215 {
216         struct uld_ctx *u_ctx, *tmp;
217
218         if (atomic_read(&dev_count))
219                 stop_crypto();
220
221         /* Remove all devices from list */
222         mutex_lock(&dev_mutex);
223         list_for_each_entry_safe(u_ctx, tmp, &uld_ctx_list, entry) {
224                 if (u_ctx->dev)
225                         chcr_dev_remove(u_ctx);
226                 kfree(u_ctx);
227         }
228         mutex_unlock(&dev_mutex);
229         cxgb4_unregister_uld(CXGB4_ULD_CRYPTO);
230 }
231
232 module_init(chcr_crypto_init);
233 module_exit(chcr_crypto_exit);
234
235 MODULE_DESCRIPTION("Crypto Co-processor for Chelsio Terminator cards.");
236 MODULE_LICENSE("GPL");
237 MODULE_AUTHOR("Chelsio Communications");
238 MODULE_VERSION(DRV_VERSION);