390 lines
10 KiB
C
390 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* sl3516-ce-cipher.c - hardware cryptographic offloader for Storlink SL3516 SoC
|
|
*
|
|
* Copyright (C) 2021 Corentin LABBE <clabbe@baylibre.com>
|
|
*
|
|
* This file adds support for AES cipher with 128,192,256 bits keysize in
|
|
* ECB mode.
|
|
*/
|
|
|
|
#include <linux/crypto.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <crypto/scatterwalk.h>
|
|
#include <crypto/internal/skcipher.h>
|
|
#include "sl3516-ce.h"
|
|
|
|
/* sl3516_ce_need_fallback - check if a request can be handled by the CE */
|
|
static bool sl3516_ce_need_fallback(struct skcipher_request *areq)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
|
struct sl3516_ce_dev *ce = op->ce;
|
|
struct scatterlist *in_sg;
|
|
struct scatterlist *out_sg;
|
|
struct scatterlist *sg;
|
|
|
|
if (areq->cryptlen == 0 || areq->cryptlen % 16) {
|
|
ce->fallback_mod16++;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* check if we have enough descriptors for TX
|
|
* Note: TX need one control desc for each SG
|
|
*/
|
|
if (sg_nents(areq->src) > MAXDESC / 2) {
|
|
ce->fallback_sg_count_tx++;
|
|
return true;
|
|
}
|
|
/* check if we have enough descriptors for RX */
|
|
if (sg_nents(areq->dst) > MAXDESC) {
|
|
ce->fallback_sg_count_rx++;
|
|
return true;
|
|
}
|
|
|
|
sg = areq->src;
|
|
while (sg) {
|
|
if ((sg->length % 16) != 0) {
|
|
ce->fallback_mod16++;
|
|
return true;
|
|
}
|
|
if ((sg_dma_len(sg) % 16) != 0) {
|
|
ce->fallback_mod16++;
|
|
return true;
|
|
}
|
|
if (!IS_ALIGNED(sg->offset, 16)) {
|
|
ce->fallback_align16++;
|
|
return true;
|
|
}
|
|
sg = sg_next(sg);
|
|
}
|
|
sg = areq->dst;
|
|
while (sg) {
|
|
if ((sg->length % 16) != 0) {
|
|
ce->fallback_mod16++;
|
|
return true;
|
|
}
|
|
if ((sg_dma_len(sg) % 16) != 0) {
|
|
ce->fallback_mod16++;
|
|
return true;
|
|
}
|
|
if (!IS_ALIGNED(sg->offset, 16)) {
|
|
ce->fallback_align16++;
|
|
return true;
|
|
}
|
|
sg = sg_next(sg);
|
|
}
|
|
|
|
/* need same numbers of SG (with same length) for source and destination */
|
|
in_sg = areq->src;
|
|
out_sg = areq->dst;
|
|
while (in_sg && out_sg) {
|
|
if (in_sg->length != out_sg->length) {
|
|
ce->fallback_not_same_len++;
|
|
return true;
|
|
}
|
|
in_sg = sg_next(in_sg);
|
|
out_sg = sg_next(out_sg);
|
|
}
|
|
if (in_sg || out_sg)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static int sl3516_ce_cipher_fallback(struct skcipher_request *areq)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
|
struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
struct sl3516_ce_alg_template *algt;
|
|
int err;
|
|
|
|
algt = container_of(alg, struct sl3516_ce_alg_template, alg.skcipher);
|
|
algt->stat_fb++;
|
|
|
|
skcipher_request_set_tfm(&rctx->fallback_req, op->fallback_tfm);
|
|
skcipher_request_set_callback(&rctx->fallback_req, areq->base.flags,
|
|
areq->base.complete, areq->base.data);
|
|
skcipher_request_set_crypt(&rctx->fallback_req, areq->src, areq->dst,
|
|
areq->cryptlen, areq->iv);
|
|
if (rctx->op_dir == CE_DECRYPTION)
|
|
err = crypto_skcipher_decrypt(&rctx->fallback_req);
|
|
else
|
|
err = crypto_skcipher_encrypt(&rctx->fallback_req);
|
|
return err;
|
|
}
|
|
|
|
static int sl3516_ce_cipher(struct skcipher_request *areq)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
|
struct sl3516_ce_dev *ce = op->ce;
|
|
struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
|
|
struct sl3516_ce_alg_template *algt;
|
|
struct scatterlist *sg;
|
|
unsigned int todo, len;
|
|
struct pkt_control_ecb *ecb;
|
|
int nr_sgs = 0;
|
|
int nr_sgd = 0;
|
|
int err = 0;
|
|
int i;
|
|
|
|
algt = container_of(alg, struct sl3516_ce_alg_template, alg.skcipher);
|
|
|
|
dev_dbg(ce->dev, "%s %s %u %x IV(%p %u) key=%u\n", __func__,
|
|
crypto_tfm_alg_name(areq->base.tfm),
|
|
areq->cryptlen,
|
|
rctx->op_dir, areq->iv, crypto_skcipher_ivsize(tfm),
|
|
op->keylen);
|
|
|
|
algt->stat_req++;
|
|
|
|
if (areq->src == areq->dst) {
|
|
nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
|
|
DMA_BIDIRECTIONAL);
|
|
if (nr_sgs <= 0 || nr_sgs > MAXDESC / 2) {
|
|
dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
|
|
err = -EINVAL;
|
|
goto theend;
|
|
}
|
|
nr_sgd = nr_sgs;
|
|
} else {
|
|
nr_sgs = dma_map_sg(ce->dev, areq->src, sg_nents(areq->src),
|
|
DMA_TO_DEVICE);
|
|
if (nr_sgs <= 0 || nr_sgs > MAXDESC / 2) {
|
|
dev_err(ce->dev, "Invalid sg number %d\n", nr_sgs);
|
|
err = -EINVAL;
|
|
goto theend;
|
|
}
|
|
nr_sgd = dma_map_sg(ce->dev, areq->dst, sg_nents(areq->dst),
|
|
DMA_FROM_DEVICE);
|
|
if (nr_sgd <= 0 || nr_sgd > MAXDESC) {
|
|
dev_err(ce->dev, "Invalid sg number %d\n", nr_sgd);
|
|
err = -EINVAL;
|
|
goto theend_sgs;
|
|
}
|
|
}
|
|
|
|
len = areq->cryptlen;
|
|
i = 0;
|
|
sg = areq->src;
|
|
while (i < nr_sgs && sg && len) {
|
|
if (sg_dma_len(sg) == 0)
|
|
goto sgs_next;
|
|
rctx->t_src[i].addr = sg_dma_address(sg);
|
|
todo = min(len, sg_dma_len(sg));
|
|
rctx->t_src[i].len = todo;
|
|
dev_dbg(ce->dev, "%s total=%u SGS(%d %u off=%d) todo=%u\n", __func__,
|
|
areq->cryptlen, i, rctx->t_src[i].len, sg->offset, todo);
|
|
len -= todo;
|
|
i++;
|
|
sgs_next:
|
|
sg = sg_next(sg);
|
|
}
|
|
if (len > 0) {
|
|
dev_err(ce->dev, "remaining len %d/%u nr_sgs=%d\n", len, areq->cryptlen, nr_sgs);
|
|
err = -EINVAL;
|
|
goto theend_sgs;
|
|
}
|
|
|
|
len = areq->cryptlen;
|
|
i = 0;
|
|
sg = areq->dst;
|
|
while (i < nr_sgd && sg && len) {
|
|
if (sg_dma_len(sg) == 0)
|
|
goto sgd_next;
|
|
rctx->t_dst[i].addr = sg_dma_address(sg);
|
|
todo = min(len, sg_dma_len(sg));
|
|
rctx->t_dst[i].len = todo;
|
|
dev_dbg(ce->dev, "%s total=%u SGD(%d %u off=%d) todo=%u\n", __func__,
|
|
areq->cryptlen, i, rctx->t_dst[i].len, sg->offset, todo);
|
|
len -= todo;
|
|
i++;
|
|
|
|
sgd_next:
|
|
sg = sg_next(sg);
|
|
}
|
|
if (len > 0) {
|
|
dev_err(ce->dev, "remaining len %d\n", len);
|
|
err = -EINVAL;
|
|
goto theend_sgs;
|
|
}
|
|
|
|
switch (algt->mode) {
|
|
case ECB_AES:
|
|
rctx->pctrllen = sizeof(struct pkt_control_ecb);
|
|
ecb = (struct pkt_control_ecb *)ce->pctrl;
|
|
|
|
rctx->tqflag = TQ0_TYPE_CTRL;
|
|
rctx->tqflag |= TQ1_CIPHER;
|
|
ecb->control.op_mode = rctx->op_dir;
|
|
ecb->control.cipher_algorithm = ECB_AES;
|
|
ecb->cipher.header_len = 0;
|
|
ecb->cipher.algorithm_len = areq->cryptlen;
|
|
cpu_to_be32_array((__be32 *)ecb->key, (u32 *)op->key, op->keylen / 4);
|
|
rctx->h = &ecb->cipher;
|
|
|
|
rctx->tqflag |= TQ4_KEY0;
|
|
rctx->tqflag |= TQ5_KEY4;
|
|
rctx->tqflag |= TQ6_KEY6;
|
|
ecb->control.aesnk = op->keylen / 4;
|
|
break;
|
|
}
|
|
|
|
rctx->nr_sgs = nr_sgs;
|
|
rctx->nr_sgd = nr_sgd;
|
|
err = sl3516_ce_run_task(ce, rctx, crypto_tfm_alg_name(areq->base.tfm));
|
|
|
|
theend_sgs:
|
|
if (areq->src == areq->dst) {
|
|
dma_unmap_sg(ce->dev, areq->src, sg_nents(areq->src),
|
|
DMA_BIDIRECTIONAL);
|
|
} else {
|
|
dma_unmap_sg(ce->dev, areq->src, sg_nents(areq->src),
|
|
DMA_TO_DEVICE);
|
|
dma_unmap_sg(ce->dev, areq->dst, sg_nents(areq->dst),
|
|
DMA_FROM_DEVICE);
|
|
}
|
|
|
|
theend:
|
|
|
|
return err;
|
|
}
|
|
|
|
static int sl3516_ce_handle_cipher_request(struct crypto_engine *engine, void *areq)
|
|
{
|
|
int err;
|
|
struct skcipher_request *breq = container_of(areq, struct skcipher_request, base);
|
|
|
|
err = sl3516_ce_cipher(breq);
|
|
local_bh_disable();
|
|
crypto_finalize_skcipher_request(engine, breq, err);
|
|
local_bh_enable();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sl3516_ce_skdecrypt(struct skcipher_request *areq)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
|
struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
|
|
struct crypto_engine *engine;
|
|
|
|
memset(rctx, 0, sizeof(struct sl3516_ce_cipher_req_ctx));
|
|
rctx->op_dir = CE_DECRYPTION;
|
|
|
|
if (sl3516_ce_need_fallback(areq))
|
|
return sl3516_ce_cipher_fallback(areq);
|
|
|
|
engine = op->ce->engine;
|
|
|
|
return crypto_transfer_skcipher_request_to_engine(engine, areq);
|
|
}
|
|
|
|
int sl3516_ce_skencrypt(struct skcipher_request *areq)
|
|
{
|
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(areq);
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
|
struct sl3516_ce_cipher_req_ctx *rctx = skcipher_request_ctx(areq);
|
|
struct crypto_engine *engine;
|
|
|
|
memset(rctx, 0, sizeof(struct sl3516_ce_cipher_req_ctx));
|
|
rctx->op_dir = CE_ENCRYPTION;
|
|
|
|
if (sl3516_ce_need_fallback(areq))
|
|
return sl3516_ce_cipher_fallback(areq);
|
|
|
|
engine = op->ce->engine;
|
|
|
|
return crypto_transfer_skcipher_request_to_engine(engine, areq);
|
|
}
|
|
|
|
int sl3516_ce_cipher_init(struct crypto_tfm *tfm)
|
|
{
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
|
|
struct sl3516_ce_alg_template *algt;
|
|
const char *name = crypto_tfm_alg_name(tfm);
|
|
struct crypto_skcipher *sktfm = __crypto_skcipher_cast(tfm);
|
|
struct skcipher_alg *alg = crypto_skcipher_alg(sktfm);
|
|
int err;
|
|
|
|
memset(op, 0, sizeof(struct sl3516_ce_cipher_tfm_ctx));
|
|
|
|
algt = container_of(alg, struct sl3516_ce_alg_template, alg.skcipher);
|
|
op->ce = algt->ce;
|
|
|
|
op->fallback_tfm = crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK);
|
|
if (IS_ERR(op->fallback_tfm)) {
|
|
dev_err(op->ce->dev, "ERROR: Cannot allocate fallback for %s %ld\n",
|
|
name, PTR_ERR(op->fallback_tfm));
|
|
return PTR_ERR(op->fallback_tfm);
|
|
}
|
|
|
|
sktfm->reqsize = sizeof(struct sl3516_ce_cipher_req_ctx) +
|
|
crypto_skcipher_reqsize(op->fallback_tfm);
|
|
|
|
dev_info(op->ce->dev, "Fallback for %s is %s\n",
|
|
crypto_tfm_alg_driver_name(&sktfm->base),
|
|
crypto_tfm_alg_driver_name(crypto_skcipher_tfm(op->fallback_tfm)));
|
|
|
|
op->enginectx.op.do_one_request = sl3516_ce_handle_cipher_request;
|
|
op->enginectx.op.prepare_request = NULL;
|
|
op->enginectx.op.unprepare_request = NULL;
|
|
|
|
err = pm_runtime_get_sync(op->ce->dev);
|
|
if (err < 0)
|
|
goto error_pm;
|
|
|
|
return 0;
|
|
error_pm:
|
|
pm_runtime_put_noidle(op->ce->dev);
|
|
crypto_free_skcipher(op->fallback_tfm);
|
|
return err;
|
|
}
|
|
|
|
void sl3516_ce_cipher_exit(struct crypto_tfm *tfm)
|
|
{
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_tfm_ctx(tfm);
|
|
|
|
kfree_sensitive(op->key);
|
|
crypto_free_skcipher(op->fallback_tfm);
|
|
pm_runtime_put_sync_suspend(op->ce->dev);
|
|
}
|
|
|
|
int sl3516_ce_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
|
|
unsigned int keylen)
|
|
{
|
|
struct sl3516_ce_cipher_tfm_ctx *op = crypto_skcipher_ctx(tfm);
|
|
struct sl3516_ce_dev *ce = op->ce;
|
|
|
|
switch (keylen) {
|
|
case 128 / 8:
|
|
break;
|
|
case 192 / 8:
|
|
break;
|
|
case 256 / 8:
|
|
break;
|
|
default:
|
|
dev_dbg(ce->dev, "ERROR: Invalid keylen %u\n", keylen);
|
|
return -EINVAL;
|
|
}
|
|
kfree_sensitive(op->key);
|
|
op->keylen = keylen;
|
|
op->key = kmemdup(key, keylen, GFP_KERNEL | GFP_DMA);
|
|
if (!op->key)
|
|
return -ENOMEM;
|
|
|
|
crypto_skcipher_clear_flags(op->fallback_tfm, CRYPTO_TFM_REQ_MASK);
|
|
crypto_skcipher_set_flags(op->fallback_tfm, tfm->base.crt_flags & CRYPTO_TFM_REQ_MASK);
|
|
|
|
return crypto_skcipher_setkey(op->fallback_tfm, key, keylen);
|
|
}
|