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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2016 Cavium, Inc.
*/
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/authenc.h>
#include <crypto/internal/des.h>
#include <crypto/xts.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/scatterlist.h>
#include "cptvf.h"
#include "cptvf_algs.h"
struct cpt_device_handle {
void *cdev[MAX_DEVICES];
u32 dev_count;
};
static struct cpt_device_handle dev_handle;
static void cvm_callback(u32 status, void *arg)
{
struct crypto_async_request *req = (struct crypto_async_request *)arg;
req->complete(req, !status);
}
static inline void update_input_iv(struct cpt_request_info *req_info,
u8 *iv, u32 enc_iv_len,
u32 *argcnt)
{
/* Setting the iv information */
req_info->in[*argcnt].vptr = (void *)iv;
req_info->in[*argcnt].size = enc_iv_len;
req_info->req.dlen += enc_iv_len;
++(*argcnt);
}
static inline void update_output_iv(struct cpt_request_info *req_info,
u8 *iv, u32 enc_iv_len,
u32 *argcnt)
{
/* Setting the iv information */
req_info->out[*argcnt].vptr = (void *)iv;
req_info->out[*argcnt].size = enc_iv_len;
req_info->rlen += enc_iv_len;
++(*argcnt);
}
static inline void update_input_data(struct cpt_request_info *req_info,
struct scatterlist *inp_sg,
u32 nbytes, u32 *argcnt)
{
req_info->req.dlen += nbytes;
while (nbytes) {
u32 len = min(nbytes, inp_sg->length);
u8 *ptr = sg_virt(inp_sg);
req_info->in[*argcnt].vptr = (void *)ptr;
req_info->in[*argcnt].size = len;
nbytes -= len;
++(*argcnt);
++inp_sg;
}
}
static inline void update_output_data(struct cpt_request_info *req_info,
struct scatterlist *outp_sg,
u32 nbytes, u32 *argcnt)
{
req_info->rlen += nbytes;
while (nbytes) {
u32 len = min(nbytes, outp_sg->length);
u8 *ptr = sg_virt(outp_sg);
req_info->out[*argcnt].vptr = (void *)ptr;
req_info->out[*argcnt].size = len;
nbytes -= len;
++(*argcnt);
++outp_sg;
}
}
static inline u32 create_ctx_hdr(struct skcipher_request *req, u32 enc,
u32 *argcnt)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct cvm_enc_ctx *ctx = crypto_skcipher_ctx(tfm);
struct cvm_req_ctx *rctx = skcipher_request_ctx(req);
struct fc_context *fctx = &rctx->fctx;
u64 *offset_control = &rctx->control_word;
u32 enc_iv_len = crypto_skcipher_ivsize(tfm);
struct cpt_request_info *req_info = &rctx->cpt_req;
u64 *ctrl_flags = NULL;
req_info->ctrl.s.grp = 0;
req_info->ctrl.s.dma_mode = DMA_GATHER_SCATTER;
req_info->ctrl.s.se_req = SE_CORE_REQ;
req_info->req.opcode.s.major = MAJOR_OP_FC |
DMA_MODE_FLAG(DMA_GATHER_SCATTER);
if (enc)
req_info->req.opcode.s.minor = 2;
else
req_info->req.opcode.s.minor = 3;
req_info->req.param1 = req->cryptlen; /* Encryption Data length */
req_info->req.param2 = 0; /*Auth data length */
fctx->enc.enc_ctrl.e.enc_cipher = ctx->cipher_type;
fctx->enc.enc_ctrl.e.aes_key = ctx->key_type;
fctx->enc.enc_ctrl.e.iv_source = FROM_DPTR;
if (ctx->cipher_type == AES_XTS)
memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len * 2);
else
memcpy(fctx->enc.encr_key, ctx->enc_key, ctx->key_len);
ctrl_flags = (u64 *)&fctx->enc.enc_ctrl.flags;
*ctrl_flags = cpu_to_be64(*ctrl_flags);
*offset_control = cpu_to_be64(((u64)(enc_iv_len) << 16));
/* Storing Packet Data Information in offset
* Control Word First 8 bytes
*/
req_info->in[*argcnt].vptr = (u8 *)offset_control;
req_info->in[*argcnt].size = CONTROL_WORD_LEN;
req_info->req.dlen += CONTROL_WORD_LEN;
++(*argcnt);
req_info->in[*argcnt].vptr = (u8 *)fctx;
req_info->in[*argcnt].size = sizeof(struct fc_context);
req_info->req.dlen += sizeof(struct fc_context);
++(*argcnt);
return 0;
}
static inline u32 create_input_list(struct skcipher_request *req, u32 enc,
u32 enc_iv_len)
{
struct cvm_req_ctx *rctx = skcipher_request_ctx(req);
struct cpt_request_info *req_info = &rctx->cpt_req;
u32 argcnt = 0;
create_ctx_hdr(req, enc, &argcnt);
update_input_iv(req_info, req->iv, enc_iv_len, &argcnt);
update_input_data(req_info, req->src, req->cryptlen, &argcnt);
req_info->incnt = argcnt;
return 0;
}
static inline void store_cb_info(struct skcipher_request *req,
struct cpt_request_info *req_info)
{
req_info->callback = (void *)cvm_callback;
req_info->callback_arg = (void *)&req->base;
}
static inline void create_output_list(struct skcipher_request *req,
u32 enc_iv_len)
{
struct cvm_req_ctx *rctx = skcipher_request_ctx(req);
struct cpt_request_info *req_info = &rctx->cpt_req;
u32 argcnt = 0;
/* OUTPUT Buffer Processing
* AES encryption/decryption output would be
* received in the following format
*
* ------IV--------|------ENCRYPTED/DECRYPTED DATA-----|
* [ 16 Bytes/ [ Request Enc/Dec/ DATA Len AES CBC ]
*/
/* Reading IV information */
update_output_iv(req_info, req->iv, enc_iv_len, &argcnt);
update_output_data(req_info, req->dst, req->cryptlen, &argcnt);
req_info->outcnt = argcnt;
}
static inline int cvm_enc_dec(struct skcipher_request *req, u32 enc)
{
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
struct cvm_req_ctx *rctx = skcipher_request_ctx(req);
u32 enc_iv_len = crypto_skcipher_ivsize(tfm);
struct fc_context *fctx = &rctx->fctx;
struct cpt_request_info *req_info = &rctx->cpt_req;
void *cdev = NULL;
int status;
memset(req_info, 0, sizeof(struct cpt_request_info));
req_info->may_sleep = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) != 0;
memset(fctx, 0, sizeof(struct fc_context));
create_input_list(req, enc, enc_iv_len);
create_output_list(req, enc_iv_len);
store_cb_info(req, req_info);
cdev = dev_handle.cdev[smp_processor_id()];
status = cptvf_do_request(cdev, req_info);
/* We perform an asynchronous send and once
* the request is completed the driver would
* intimate through registered call back functions
*/
if (status)
return status;
else
return -EINPROGRESS;
}
static int cvm_encrypt(struct skcipher_request *req)
{
return cvm_enc_dec(req, true);
}
static int cvm_decrypt(struct skcipher_request *req)
{
return cvm_enc_dec(req, false);
}
static int cvm_xts_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
int err;
const u8 *key1 = key;
const u8 *key2 = key + (keylen / 2);
err = xts_check_key(tfm, key, keylen);
if (err)
return err;
ctx->key_len = keylen;
memcpy(ctx->enc_key, key1, keylen / 2);
memcpy(ctx->enc_key + KEY2_OFFSET, key2, keylen / 2);
ctx->cipher_type = AES_XTS;
switch (ctx->key_len) {
case 32:
ctx->key_type = AES_128_BIT;
break;
case 64:
ctx->key_type = AES_256_BIT;
break;
default:
return -EINVAL;
}
return 0;
}
static int cvm_validate_keylen(struct cvm_enc_ctx *ctx, u32 keylen)
{
if ((keylen == 16) || (keylen == 24) || (keylen == 32)) {
ctx->key_len = keylen;
switch (ctx->key_len) {
case 16:
ctx->key_type = AES_128_BIT;
break;
case 24:
ctx->key_type = AES_192_BIT;
break;
case 32:
ctx->key_type = AES_256_BIT;
break;
default:
return -EINVAL;
}
if (ctx->cipher_type == DES3_CBC)
ctx->key_type = 0;
return 0;
}
return -EINVAL;
}
static int cvm_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen, u8 cipher_type)
{
struct crypto_tfm *tfm = crypto_skcipher_tfm(cipher);
struct cvm_enc_ctx *ctx = crypto_tfm_ctx(tfm);
ctx->cipher_type = cipher_type;
if (!cvm_validate_keylen(ctx, keylen)) {
memcpy(ctx->enc_key, key, keylen);
return 0;
} else {
return -EINVAL;
}
}
static int cvm_cbc_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
return cvm_setkey(cipher, key, keylen, AES_CBC);
}
static int cvm_ecb_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
return cvm_setkey(cipher, key, keylen, AES_ECB);
}
static int cvm_cfb_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
return cvm_setkey(cipher, key, keylen, AES_CFB);
}
static int cvm_cbc_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
return verify_skcipher_des3_key(cipher, key) ?:
cvm_setkey(cipher, key, keylen, DES3_CBC);
}
static int cvm_ecb_des3_setkey(struct crypto_skcipher *cipher, const u8 *key,
u32 keylen)
{
return verify_skcipher_des3_key(cipher, key) ?:
cvm_setkey(cipher, key, keylen, DES3_ECB);
}
static int cvm_enc_dec_init(struct crypto_skcipher *tfm)
{
crypto_skcipher_set_reqsize(tfm, sizeof(struct cvm_req_ctx));
return 0;
}
static struct skcipher_alg algs[] = { {
.base.cra_flags = CRYPTO_ALG_ASYNC,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct cvm_enc_ctx),
.base.cra_alignmask = 7,
.base.cra_priority = 4001,
.base.cra_name = "xts(aes)",
.base.cra_driver_name = "cavium-xts-aes",
.base.cra_module = THIS_MODULE,
.ivsize = AES_BLOCK_SIZE,
.min_keysize = 2 * AES_MIN_KEY_SIZE,
.max_keysize = 2 * AES_MAX_KEY_SIZE,
.setkey = cvm_xts_setkey,
.encrypt = cvm_encrypt,
.decrypt = cvm_decrypt,
.init = cvm_enc_dec_init,
}, {
.base.cra_flags = CRYPTO_ALG_ASYNC,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct cvm_enc_ctx),
.base.cra_alignmask = 7,
.base.cra_priority = 4001,
.base.cra_name = "cbc(aes)",
.base.cra_driver_name = "cavium-cbc-aes",
.base.cra_module = THIS_MODULE,
.ivsize = AES_BLOCK_SIZE,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = cvm_cbc_aes_setkey,
.encrypt = cvm_encrypt,
.decrypt = cvm_decrypt,
.init = cvm_enc_dec_init,
}, {
.base.cra_flags = CRYPTO_ALG_ASYNC,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct cvm_enc_ctx),
.base.cra_alignmask = 7,
.base.cra_priority = 4001,
.base.cra_name = "ecb(aes)",
.base.cra_driver_name = "cavium-ecb-aes",
.base.cra_module = THIS_MODULE,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = cvm_ecb_aes_setkey,
.encrypt = cvm_encrypt,
.decrypt = cvm_decrypt,
.init = cvm_enc_dec_init,
}, {
.base.cra_flags = CRYPTO_ALG_ASYNC,
.base.cra_blocksize = AES_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct cvm_enc_ctx),
.base.cra_alignmask = 7,
.base.cra_priority = 4001,
.base.cra_name = "cfb(aes)",
.base.cra_driver_name = "cavium-cfb-aes",
.base.cra_module = THIS_MODULE,
.ivsize = AES_BLOCK_SIZE,
.min_keysize = AES_MIN_KEY_SIZE,
.max_keysize = AES_MAX_KEY_SIZE,
.setkey = cvm_cfb_aes_setkey,
.encrypt = cvm_encrypt,
.decrypt = cvm_decrypt,
.init = cvm_enc_dec_init,
}, {
.base.cra_flags = CRYPTO_ALG_ASYNC,
.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct cvm_des3_ctx),
.base.cra_alignmask = 7,
.base.cra_priority = 4001,
.base.cra_name = "cbc(des3_ede)",
.base.cra_driver_name = "cavium-cbc-des3_ede",
.base.cra_module = THIS_MODULE,
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = cvm_cbc_des3_setkey,
.encrypt = cvm_encrypt,
.decrypt = cvm_decrypt,
.init = cvm_enc_dec_init,
}, {
.base.cra_flags = CRYPTO_ALG_ASYNC,
.base.cra_blocksize = DES3_EDE_BLOCK_SIZE,
.base.cra_ctxsize = sizeof(struct cvm_des3_ctx),
.base.cra_alignmask = 7,
.base.cra_priority = 4001,
.base.cra_name = "ecb(des3_ede)",
.base.cra_driver_name = "cavium-ecb-des3_ede",
.base.cra_module = THIS_MODULE,
.min_keysize = DES3_EDE_KEY_SIZE,
.max_keysize = DES3_EDE_KEY_SIZE,
.ivsize = DES_BLOCK_SIZE,
.setkey = cvm_ecb_des3_setkey,
.encrypt = cvm_encrypt,
.decrypt = cvm_decrypt,
.init = cvm_enc_dec_init,
} };
static inline int cav_register_algs(void)
{
int err = 0;
err = crypto_register_skciphers(algs, ARRAY_SIZE(algs));
if (err)
return err;
return 0;
}
static inline void cav_unregister_algs(void)
{
crypto_unregister_skciphers(algs, ARRAY_SIZE(algs));
}
int cvm_crypto_init(struct cpt_vf *cptvf)
{
struct pci_dev *pdev = cptvf->pdev;
u32 dev_count;
dev_count = dev_handle.dev_count;
dev_handle.cdev[dev_count] = cptvf;
dev_handle.dev_count++;
if (dev_count == 3) {
if (cav_register_algs()) {
dev_err(&pdev->dev, "Error in registering crypto algorithms\n");
return -EINVAL;
}
}
return 0;
}
void cvm_crypto_exit(void)
{
u32 dev_count;
dev_count = --dev_handle.dev_count;
if (!dev_count)
cav_unregister_algs();
}
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