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crypto: cavium/nitrox - Added AEAD cipher support
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Added support to offload AEAD ciphers to NITROX. Currently supported
AEAD cipher is 'gcm(aes)'.

Signed-off-by: Nagadheeraj Rottela <rnagadheeraj@marvell.com>
Reviewed-by: Srikanth Jampala <jsrikanth@marvell.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Nagadheeraj Rottela authored and herbertx committed Dec 23, 2018
1 parent 2326828 commit c961333
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Showing 7 changed files with 1,103 additions and 605 deletions.
4 changes: 3 additions & 1 deletion drivers/crypto/cavium/nitrox/Makefile
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Expand Up @@ -7,7 +7,9 @@ n5pf-objs := nitrox_main.o \
nitrox_hal.o \
nitrox_reqmgr.o \
nitrox_algs.o \
nitrox_mbx.o
nitrox_mbx.o \
nitrox_skcipher.o \
nitrox_aead.o

n5pf-$(CONFIG_PCI_IOV) += nitrox_sriov.o
n5pf-$(CONFIG_DEBUG_FS) += nitrox_debugfs.o
364 changes: 364 additions & 0 deletions drivers/crypto/cavium/nitrox/nitrox_aead.c
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@@ -0,0 +1,364 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/printk.h>
#include <linux/crypto.h>
#include <linux/rtnetlink.h>

#include <crypto/aead.h>
#include <crypto/authenc.h>
#include <crypto/des.h>
#include <crypto/sha.h>
#include <crypto/internal/aead.h>
#include <crypto/scatterwalk.h>
#include <crypto/gcm.h>

#include "nitrox_dev.h"
#include "nitrox_common.h"
#include "nitrox_req.h"

#define GCM_AES_SALT_SIZE 4

/**
* struct nitrox_crypt_params - Params to set nitrox crypto request.
* @cryptlen: Encryption/Decryption data length
* @authlen: Assoc data length + Cryptlen
* @srclen: Input buffer length
* @dstlen: Output buffer length
* @iv: IV data
* @ivsize: IV data length
* @ctrl_arg: Identifies the request type (ENCRYPT/DECRYPT)
*/
struct nitrox_crypt_params {
unsigned int cryptlen;
unsigned int authlen;
unsigned int srclen;
unsigned int dstlen;
u8 *iv;
int ivsize;
u8 ctrl_arg;
};

union gph_p3 {
struct {
#ifdef __BIG_ENDIAN_BITFIELD
u16 iv_offset : 8;
u16 auth_offset : 8;
#else
u16 auth_offset : 8;
u16 iv_offset : 8;
#endif
};
u16 param;
};

static int nitrox_aes_gcm_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
int aes_keylen;
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct flexi_crypto_context *fctx;
union fc_ctx_flags flags;

aes_keylen = flexi_aes_keylen(keylen);
if (aes_keylen < 0) {
crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}

/* fill crypto context */
fctx = nctx->u.fctx;
flags.f = be64_to_cpu(fctx->flags.f);
flags.w0.aes_keylen = aes_keylen;
fctx->flags.f = cpu_to_be64(flags.f);

/* copy enc key to context */
memset(&fctx->crypto, 0, sizeof(fctx->crypto));
memcpy(fctx->crypto.u.key, key, keylen);

return 0;
}

static int nitrox_aead_setauthsize(struct crypto_aead *aead,
unsigned int authsize)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct flexi_crypto_context *fctx = nctx->u.fctx;
union fc_ctx_flags flags;

flags.f = be64_to_cpu(fctx->flags.f);
flags.w0.mac_len = authsize;
fctx->flags.f = cpu_to_be64(flags.f);

aead->authsize = authsize;

return 0;
}

static int alloc_src_sglist(struct aead_request *areq, char *iv, int ivsize,
int buflen)
{
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
int nents = sg_nents_for_len(areq->src, buflen) + 1;
int ret;

if (nents < 0)
return nents;

/* Allocate buffer to hold IV and input scatterlist array */
ret = alloc_src_req_buf(nkreq, nents, ivsize);
if (ret)
return ret;

nitrox_creq_copy_iv(nkreq->src, iv, ivsize);
nitrox_creq_set_src_sg(nkreq, nents, ivsize, areq->src, buflen);

return 0;
}

static int alloc_dst_sglist(struct aead_request *areq, int ivsize, int buflen)
{
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
int nents = sg_nents_for_len(areq->dst, buflen) + 3;
int ret;

if (nents < 0)
return nents;

/* Allocate buffer to hold ORH, COMPLETION and output scatterlist
* array
*/
ret = alloc_dst_req_buf(nkreq, nents);
if (ret)
return ret;

nitrox_creq_set_orh(nkreq);
nitrox_creq_set_comp(nkreq);
nitrox_creq_set_dst_sg(nkreq, nents, ivsize, areq->dst, buflen);

return 0;
}

static void free_src_sglist(struct aead_request *areq)
{
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);

kfree(nkreq->src);
}

static void free_dst_sglist(struct aead_request *areq)
{
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);

kfree(nkreq->dst);
}

static int nitrox_set_creq(struct aead_request *areq,
struct nitrox_crypt_params *params)
{
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
struct se_crypto_request *creq = &nkreq->creq;
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
union gph_p3 param3;
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
int ret;

creq->flags = areq->base.flags;
creq->gfp = (areq->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
GFP_KERNEL : GFP_ATOMIC;

creq->ctrl.value = 0;
creq->opcode = FLEXI_CRYPTO_ENCRYPT_HMAC;
creq->ctrl.s.arg = params->ctrl_arg;

creq->gph.param0 = cpu_to_be16(params->cryptlen);
creq->gph.param1 = cpu_to_be16(params->authlen);
creq->gph.param2 = cpu_to_be16(params->ivsize + areq->assoclen);
param3.iv_offset = 0;
param3.auth_offset = params->ivsize;
creq->gph.param3 = cpu_to_be16(param3.param);

creq->ctx_handle = nctx->u.ctx_handle;
creq->ctrl.s.ctxl = sizeof(struct flexi_crypto_context);

ret = alloc_src_sglist(areq, params->iv, params->ivsize,
params->srclen);
if (ret)
return ret;

ret = alloc_dst_sglist(areq, params->ivsize, params->dstlen);
if (ret) {
free_src_sglist(areq);
return ret;
}

return 0;
}

static void nitrox_aead_callback(void *arg, int err)
{
struct aead_request *areq = arg;

free_src_sglist(areq);
free_dst_sglist(areq);
if (err) {
pr_err_ratelimited("request failed status 0x%0x\n", err);
err = -EINVAL;
}

areq->base.complete(&areq->base, err);
}

static int nitrox_aes_gcm_enc(struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
struct se_crypto_request *creq = &nkreq->creq;
struct flexi_crypto_context *fctx = nctx->u.fctx;
struct nitrox_crypt_params params;
int ret;

memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);

memset(&params, 0, sizeof(params));
params.cryptlen = areq->cryptlen;
params.authlen = areq->assoclen + params.cryptlen;
params.srclen = params.authlen;
params.dstlen = params.srclen + aead->authsize;
params.iv = &areq->iv[GCM_AES_SALT_SIZE];
params.ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
params.ctrl_arg = ENCRYPT;
ret = nitrox_set_creq(areq, &params);
if (ret)
return ret;

/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
areq);
}

static int nitrox_aes_gcm_dec(struct aead_request *areq)
{
struct crypto_aead *aead = crypto_aead_reqtfm(areq);
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct nitrox_kcrypt_request *nkreq = aead_request_ctx(areq);
struct se_crypto_request *creq = &nkreq->creq;
struct flexi_crypto_context *fctx = nctx->u.fctx;
struct nitrox_crypt_params params;
int ret;

memcpy(fctx->crypto.iv, areq->iv, GCM_AES_SALT_SIZE);

memset(&params, 0, sizeof(params));
params.cryptlen = areq->cryptlen - aead->authsize;
params.authlen = areq->assoclen + params.cryptlen;
params.srclen = areq->cryptlen + areq->assoclen;
params.dstlen = params.srclen - aead->authsize;
params.iv = &areq->iv[GCM_AES_SALT_SIZE];
params.ivsize = GCM_AES_IV_SIZE - GCM_AES_SALT_SIZE;
params.ctrl_arg = DECRYPT;
ret = nitrox_set_creq(areq, &params);
if (ret)
return ret;

/* send the crypto request */
return nitrox_process_se_request(nctx->ndev, creq, nitrox_aead_callback,
areq);
}

static int nitrox_aead_init(struct crypto_aead *aead)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
struct crypto_ctx_hdr *chdr;

/* get the first device */
nctx->ndev = nitrox_get_first_device();
if (!nctx->ndev)
return -ENODEV;

/* allocate nitrox crypto context */
chdr = crypto_alloc_context(nctx->ndev);
if (!chdr) {
nitrox_put_device(nctx->ndev);
return -ENOMEM;
}
nctx->chdr = chdr;
nctx->u.ctx_handle = (uintptr_t)((u8 *)chdr->vaddr +
sizeof(struct ctx_hdr));
nctx->u.fctx->flags.f = 0;

return 0;
}

static int nitrox_aes_gcm_init(struct crypto_aead *aead)
{
int ret;
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);
union fc_ctx_flags *flags;

ret = nitrox_aead_init(aead);
if (ret)
return ret;

flags = &nctx->u.fctx->flags;
flags->w0.cipher_type = CIPHER_AES_GCM;
flags->w0.hash_type = AUTH_NULL;
flags->w0.iv_source = IV_FROM_DPTR;
/* ask microcode to calculate ipad/opad */
flags->w0.auth_input_type = 1;
flags->f = be64_to_cpu(flags->f);

crypto_aead_set_reqsize(aead, sizeof(struct aead_request) +
sizeof(struct nitrox_kcrypt_request));

return 0;
}

static void nitrox_aead_exit(struct crypto_aead *aead)
{
struct nitrox_crypto_ctx *nctx = crypto_aead_ctx(aead);

/* free the nitrox crypto context */
if (nctx->u.ctx_handle) {
struct flexi_crypto_context *fctx = nctx->u.fctx;

memzero_explicit(&fctx->crypto, sizeof(struct crypto_keys));
memzero_explicit(&fctx->auth, sizeof(struct auth_keys));
crypto_free_context((void *)nctx->chdr);
}
nitrox_put_device(nctx->ndev);

nctx->u.ctx_handle = 0;
nctx->ndev = NULL;
}

static struct aead_alg nitrox_aeads[] = { {
.base = {
.cra_name = "gcm(aes)",
.cra_driver_name = "n5_aes_gcm",
.cra_priority = PRIO,
.cra_flags = CRYPTO_ALG_ASYNC,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct nitrox_crypto_ctx),
.cra_alignmask = 0,
.cra_module = THIS_MODULE,
},
.setkey = nitrox_aes_gcm_setkey,
.setauthsize = nitrox_aead_setauthsize,
.encrypt = nitrox_aes_gcm_enc,
.decrypt = nitrox_aes_gcm_dec,
.init = nitrox_aes_gcm_init,
.exit = nitrox_aead_exit,
.ivsize = GCM_AES_IV_SIZE,
.maxauthsize = AES_BLOCK_SIZE,
} };

int nitrox_register_aeads(void)
{
return crypto_register_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
}

void nitrox_unregister_aeads(void)
{
crypto_unregister_aeads(nitrox_aeads, ARRAY_SIZE(nitrox_aeads));
}
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