557 lines
14 KiB
C
557 lines
14 KiB
C
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/*
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* Copyright (C) 2017 Marvell
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*
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* Antoine Tenart <antoine.tenart@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/dmapool.h>
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#include <crypto/aes.h>
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#include <crypto/skcipher.h>
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#include "safexcel.h"
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enum safexcel_cipher_direction {
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SAFEXCEL_ENCRYPT,
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SAFEXCEL_DECRYPT,
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};
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struct safexcel_cipher_ctx {
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struct safexcel_context base;
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struct safexcel_crypto_priv *priv;
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enum safexcel_cipher_direction direction;
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u32 mode;
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__le32 key[8];
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unsigned int key_len;
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};
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static void safexcel_cipher_token(struct safexcel_cipher_ctx *ctx,
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struct crypto_async_request *async,
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struct safexcel_command_desc *cdesc,
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u32 length)
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{
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struct skcipher_request *req = skcipher_request_cast(async);
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struct safexcel_token *token;
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unsigned offset = 0;
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if (ctx->mode == CONTEXT_CONTROL_CRYPTO_MODE_CBC) {
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offset = AES_BLOCK_SIZE / sizeof(u32);
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memcpy(cdesc->control_data.token, req->iv, AES_BLOCK_SIZE);
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cdesc->control_data.options |= EIP197_OPTION_4_TOKEN_IV_CMD;
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}
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token = (struct safexcel_token *)(cdesc->control_data.token + offset);
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token[0].opcode = EIP197_TOKEN_OPCODE_DIRECTION;
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token[0].packet_length = length;
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token[0].stat = EIP197_TOKEN_STAT_LAST_PACKET;
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token[0].instructions = EIP197_TOKEN_INS_LAST |
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EIP197_TOKEN_INS_TYPE_CRYTO |
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EIP197_TOKEN_INS_TYPE_OUTPUT;
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}
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static int safexcel_aes_setkey(struct crypto_skcipher *ctfm, const u8 *key,
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unsigned int len)
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{
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struct crypto_tfm *tfm = crypto_skcipher_tfm(ctfm);
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struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
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struct crypto_aes_ctx aes;
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int ret, i;
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ret = crypto_aes_expand_key(&aes, key, len);
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if (ret) {
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crypto_skcipher_set_flags(ctfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return ret;
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}
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for (i = 0; i < len / sizeof(u32); i++) {
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if (ctx->key[i] != cpu_to_le32(aes.key_enc[i])) {
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ctx->base.needs_inv = true;
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break;
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}
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}
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for (i = 0; i < len / sizeof(u32); i++)
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ctx->key[i] = cpu_to_le32(aes.key_enc[i]);
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ctx->key_len = len;
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memzero_explicit(&aes, sizeof(aes));
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return 0;
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}
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static int safexcel_context_control(struct safexcel_cipher_ctx *ctx,
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struct safexcel_command_desc *cdesc)
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{
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struct safexcel_crypto_priv *priv = ctx->priv;
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int ctrl_size;
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if (ctx->direction == SAFEXCEL_ENCRYPT)
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cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_CRYPTO_OUT;
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else
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cdesc->control_data.control0 |= CONTEXT_CONTROL_TYPE_CRYPTO_IN;
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cdesc->control_data.control0 |= CONTEXT_CONTROL_KEY_EN;
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cdesc->control_data.control1 |= ctx->mode;
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switch (ctx->key_len) {
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case AES_KEYSIZE_128:
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cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES128;
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ctrl_size = 4;
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break;
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case AES_KEYSIZE_192:
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cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES192;
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ctrl_size = 6;
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break;
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case AES_KEYSIZE_256:
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cdesc->control_data.control0 |= CONTEXT_CONTROL_CRYPTO_ALG_AES256;
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ctrl_size = 8;
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break;
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default:
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dev_err(priv->dev, "aes keysize not supported: %u\n",
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ctx->key_len);
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return -EINVAL;
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}
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cdesc->control_data.control0 |= CONTEXT_CONTROL_SIZE(ctrl_size);
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return 0;
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}
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static int safexcel_handle_result(struct safexcel_crypto_priv *priv, int ring,
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struct crypto_async_request *async,
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bool *should_complete, int *ret)
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{
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struct skcipher_request *req = skcipher_request_cast(async);
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struct safexcel_result_desc *rdesc;
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int ndesc = 0;
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*ret = 0;
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spin_lock_bh(&priv->ring[ring].egress_lock);
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do {
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rdesc = safexcel_ring_next_rptr(priv, &priv->ring[ring].rdr);
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if (IS_ERR(rdesc)) {
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dev_err(priv->dev,
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"cipher: result: could not retrieve the result descriptor\n");
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*ret = PTR_ERR(rdesc);
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break;
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}
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if (rdesc->result_data.error_code) {
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dev_err(priv->dev,
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"cipher: result: result descriptor error (%d)\n",
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rdesc->result_data.error_code);
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*ret = -EIO;
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}
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ndesc++;
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} while (!rdesc->last_seg);
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safexcel_complete(priv, ring);
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spin_unlock_bh(&priv->ring[ring].egress_lock);
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if (req->src == req->dst) {
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dma_unmap_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_BIDIRECTIONAL);
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} else {
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dma_unmap_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_TO_DEVICE);
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dma_unmap_sg(priv->dev, req->dst,
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sg_nents_for_len(req->dst, req->cryptlen),
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DMA_FROM_DEVICE);
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}
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*should_complete = true;
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return ndesc;
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}
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static int safexcel_aes_send(struct crypto_async_request *async,
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int ring, struct safexcel_request *request,
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int *commands, int *results)
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{
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struct skcipher_request *req = skcipher_request_cast(async);
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struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct safexcel_crypto_priv *priv = ctx->priv;
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struct safexcel_command_desc *cdesc;
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struct safexcel_result_desc *rdesc;
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struct scatterlist *sg;
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int nr_src, nr_dst, n_cdesc = 0, n_rdesc = 0, queued = req->cryptlen;
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int i, ret = 0;
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request->req = &req->base;
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if (req->src == req->dst) {
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nr_src = dma_map_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_BIDIRECTIONAL);
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nr_dst = nr_src;
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if (!nr_src)
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return -EINVAL;
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} else {
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nr_src = dma_map_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_TO_DEVICE);
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if (!nr_src)
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return -EINVAL;
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nr_dst = dma_map_sg(priv->dev, req->dst,
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sg_nents_for_len(req->dst, req->cryptlen),
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DMA_FROM_DEVICE);
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if (!nr_dst) {
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dma_unmap_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_TO_DEVICE);
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return -EINVAL;
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}
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}
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memcpy(ctx->base.ctxr->data, ctx->key, ctx->key_len);
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spin_lock_bh(&priv->ring[ring].egress_lock);
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/* command descriptors */
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for_each_sg(req->src, sg, nr_src, i) {
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int len = sg_dma_len(sg);
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/* Do not overflow the request */
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if (queued - len < 0)
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len = queued;
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cdesc = safexcel_add_cdesc(priv, ring, !n_cdesc, !(queued - len),
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sg_dma_address(sg), len, req->cryptlen,
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ctx->base.ctxr_dma);
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if (IS_ERR(cdesc)) {
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/* No space left in the command descriptor ring */
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ret = PTR_ERR(cdesc);
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goto cdesc_rollback;
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}
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n_cdesc++;
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if (n_cdesc == 1) {
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safexcel_context_control(ctx, cdesc);
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safexcel_cipher_token(ctx, async, cdesc, req->cryptlen);
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}
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queued -= len;
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if (!queued)
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break;
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}
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/* result descriptors */
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for_each_sg(req->dst, sg, nr_dst, i) {
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bool first = !i, last = (i == nr_dst - 1);
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u32 len = sg_dma_len(sg);
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rdesc = safexcel_add_rdesc(priv, ring, first, last,
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sg_dma_address(sg), len);
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if (IS_ERR(rdesc)) {
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/* No space left in the result descriptor ring */
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ret = PTR_ERR(rdesc);
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goto rdesc_rollback;
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}
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n_rdesc++;
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}
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ctx->base.handle_result = safexcel_handle_result;
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spin_unlock_bh(&priv->ring[ring].egress_lock);
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*commands = n_cdesc;
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*results = nr_dst;
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return 0;
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rdesc_rollback:
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for (i = 0; i < n_rdesc; i++)
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safexcel_ring_rollback_wptr(priv, &priv->ring[ring].rdr);
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cdesc_rollback:
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for (i = 0; i < n_cdesc; i++)
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safexcel_ring_rollback_wptr(priv, &priv->ring[ring].cdr);
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spin_unlock_bh(&priv->ring[ring].egress_lock);
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if (req->src == req->dst) {
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dma_unmap_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_BIDIRECTIONAL);
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} else {
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dma_unmap_sg(priv->dev, req->src,
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sg_nents_for_len(req->src, req->cryptlen),
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DMA_TO_DEVICE);
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dma_unmap_sg(priv->dev, req->dst,
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sg_nents_for_len(req->dst, req->cryptlen),
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DMA_FROM_DEVICE);
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}
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return ret;
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}
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static int safexcel_handle_inv_result(struct safexcel_crypto_priv *priv,
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int ring,
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struct crypto_async_request *async,
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bool *should_complete, int *ret)
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{
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struct skcipher_request *req = skcipher_request_cast(async);
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struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct safexcel_result_desc *rdesc;
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int ndesc = 0, enq_ret;
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*ret = 0;
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spin_lock_bh(&priv->ring[ring].egress_lock);
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do {
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rdesc = safexcel_ring_next_rptr(priv, &priv->ring[ring].rdr);
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if (IS_ERR(rdesc)) {
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dev_err(priv->dev,
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"cipher: invalidate: could not retrieve the result descriptor\n");
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*ret = PTR_ERR(rdesc);
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break;
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}
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if (rdesc->result_data.error_code) {
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dev_err(priv->dev, "cipher: invalidate: result descriptor error (%d)\n",
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rdesc->result_data.error_code);
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*ret = -EIO;
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}
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ndesc++;
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} while (!rdesc->last_seg);
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safexcel_complete(priv, ring);
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spin_unlock_bh(&priv->ring[ring].egress_lock);
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if (ctx->base.exit_inv) {
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dma_pool_free(priv->context_pool, ctx->base.ctxr,
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ctx->base.ctxr_dma);
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*should_complete = true;
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return ndesc;
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}
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ctx->base.needs_inv = false;
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ctx->base.ring = safexcel_select_ring(priv);
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ctx->base.send = safexcel_aes_send;
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spin_lock_bh(&priv->lock);
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enq_ret = crypto_enqueue_request(&priv->queue, async);
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spin_unlock_bh(&priv->lock);
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if (enq_ret != -EINPROGRESS)
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*ret = enq_ret;
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priv->need_dequeue = true;
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*should_complete = false;
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return ndesc;
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}
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static int safexcel_cipher_send_inv(struct crypto_async_request *async,
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int ring, struct safexcel_request *request,
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int *commands, int *results)
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{
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struct skcipher_request *req = skcipher_request_cast(async);
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struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
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struct safexcel_crypto_priv *priv = ctx->priv;
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int ret;
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|
|
ctx->base.handle_result = safexcel_handle_inv_result;
|
||
|
|
|
||
|
|
ret = safexcel_invalidate_cache(async, &ctx->base, priv,
|
||
|
|
ctx->base.ctxr_dma, ring, request);
|
||
|
|
if (unlikely(ret))
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
*commands = 1;
|
||
|
|
*results = 1;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int safexcel_cipher_exit_inv(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
struct safexcel_crypto_priv *priv = ctx->priv;
|
||
|
|
struct skcipher_request req;
|
||
|
|
struct safexcel_inv_result result = { 0 };
|
||
|
|
|
||
|
|
memset(&req, 0, sizeof(struct skcipher_request));
|
||
|
|
|
||
|
|
/* create invalidation request */
|
||
|
|
init_completion(&result.completion);
|
||
|
|
skcipher_request_set_callback(&req, CRYPTO_TFM_REQ_MAY_BACKLOG,
|
||
|
|
safexcel_inv_complete, &result);
|
||
|
|
|
||
|
|
skcipher_request_set_tfm(&req, __crypto_skcipher_cast(tfm));
|
||
|
|
ctx = crypto_tfm_ctx(req.base.tfm);
|
||
|
|
ctx->base.exit_inv = true;
|
||
|
|
ctx->base.send = safexcel_cipher_send_inv;
|
||
|
|
|
||
|
|
spin_lock_bh(&priv->lock);
|
||
|
|
crypto_enqueue_request(&priv->queue, &req.base);
|
||
|
|
spin_unlock_bh(&priv->lock);
|
||
|
|
|
||
|
|
if (!priv->need_dequeue)
|
||
|
|
safexcel_dequeue(priv);
|
||
|
|
|
||
|
|
wait_for_completion_interruptible(&result.completion);
|
||
|
|
|
||
|
|
if (result.error) {
|
||
|
|
dev_warn(priv->dev,
|
||
|
|
"cipher: sync: invalidate: completion error %d\n",
|
||
|
|
result.error);
|
||
|
|
return result.error;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int safexcel_aes(struct skcipher_request *req,
|
||
|
|
enum safexcel_cipher_direction dir, u32 mode)
|
||
|
|
{
|
||
|
|
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
|
||
|
|
struct safexcel_crypto_priv *priv = ctx->priv;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ctx->direction = dir;
|
||
|
|
ctx->mode = mode;
|
||
|
|
|
||
|
|
if (ctx->base.ctxr) {
|
||
|
|
if (ctx->base.needs_inv)
|
||
|
|
ctx->base.send = safexcel_cipher_send_inv;
|
||
|
|
} else {
|
||
|
|
ctx->base.ring = safexcel_select_ring(priv);
|
||
|
|
ctx->base.send = safexcel_aes_send;
|
||
|
|
|
||
|
|
ctx->base.ctxr = dma_pool_zalloc(priv->context_pool,
|
||
|
|
EIP197_GFP_FLAGS(req->base),
|
||
|
|
&ctx->base.ctxr_dma);
|
||
|
|
if (!ctx->base.ctxr)
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock_bh(&priv->lock);
|
||
|
|
ret = crypto_enqueue_request(&priv->queue, &req->base);
|
||
|
|
spin_unlock_bh(&priv->lock);
|
||
|
|
|
||
|
|
if (!priv->need_dequeue)
|
||
|
|
safexcel_dequeue(priv);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int safexcel_ecb_aes_encrypt(struct skcipher_request *req)
|
||
|
|
{
|
||
|
|
return safexcel_aes(req, SAFEXCEL_ENCRYPT,
|
||
|
|
CONTEXT_CONTROL_CRYPTO_MODE_ECB);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int safexcel_ecb_aes_decrypt(struct skcipher_request *req)
|
||
|
|
{
|
||
|
|
return safexcel_aes(req, SAFEXCEL_DECRYPT,
|
||
|
|
CONTEXT_CONTROL_CRYPTO_MODE_ECB);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int safexcel_skcipher_cra_init(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
struct safexcel_alg_template *tmpl =
|
||
|
|
container_of(tfm->__crt_alg, struct safexcel_alg_template,
|
||
|
|
alg.skcipher.base);
|
||
|
|
|
||
|
|
ctx->priv = tmpl->priv;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void safexcel_skcipher_cra_exit(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct safexcel_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
struct safexcel_crypto_priv *priv = ctx->priv;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
memzero_explicit(ctx->key, 8 * sizeof(u32));
|
||
|
|
|
||
|
|
/* context not allocated, skip invalidation */
|
||
|
|
if (!ctx->base.ctxr)
|
||
|
|
return;
|
||
|
|
|
||
|
|
memzero_explicit(ctx->base.ctxr->data, 8 * sizeof(u32));
|
||
|
|
|
||
|
|
ret = safexcel_cipher_exit_inv(tfm);
|
||
|
|
if (ret)
|
||
|
|
dev_warn(priv->dev, "cipher: invalidation error %d\n", ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
struct safexcel_alg_template safexcel_alg_ecb_aes = {
|
||
|
|
.type = SAFEXCEL_ALG_TYPE_SKCIPHER,
|
||
|
|
.alg.skcipher = {
|
||
|
|
.setkey = safexcel_aes_setkey,
|
||
|
|
.encrypt = safexcel_ecb_aes_encrypt,
|
||
|
|
.decrypt = safexcel_ecb_aes_decrypt,
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.base = {
|
||
|
|
.cra_name = "ecb(aes)",
|
||
|
|
.cra_driver_name = "safexcel-ecb-aes",
|
||
|
|
.cra_priority = 300,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_SKCIPHER | CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_init = safexcel_skcipher_cra_init,
|
||
|
|
.cra_exit = safexcel_skcipher_cra_exit,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static int safexcel_cbc_aes_encrypt(struct skcipher_request *req)
|
||
|
|
{
|
||
|
|
return safexcel_aes(req, SAFEXCEL_ENCRYPT,
|
||
|
|
CONTEXT_CONTROL_CRYPTO_MODE_CBC);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int safexcel_cbc_aes_decrypt(struct skcipher_request *req)
|
||
|
|
{
|
||
|
|
return safexcel_aes(req, SAFEXCEL_DECRYPT,
|
||
|
|
CONTEXT_CONTROL_CRYPTO_MODE_CBC);
|
||
|
|
}
|
||
|
|
|
||
|
|
struct safexcel_alg_template safexcel_alg_cbc_aes = {
|
||
|
|
.type = SAFEXCEL_ALG_TYPE_SKCIPHER,
|
||
|
|
.alg.skcipher = {
|
||
|
|
.setkey = safexcel_aes_setkey,
|
||
|
|
.encrypt = safexcel_cbc_aes_encrypt,
|
||
|
|
.decrypt = safexcel_cbc_aes_decrypt,
|
||
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
|
.base = {
|
||
|
|
.cra_name = "cbc(aes)",
|
||
|
|
.cra_driver_name = "safexcel-cbc-aes",
|
||
|
|
.cra_priority = 300,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_SKCIPHER | CRYPTO_ALG_ASYNC |
|
||
|
|
CRYPTO_ALG_KERN_DRIVER_ONLY,
|
||
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct safexcel_cipher_ctx),
|
||
|
|
.cra_alignmask = 0,
|
||
|
|
.cra_init = safexcel_skcipher_cra_init,
|
||
|
|
.cra_exit = safexcel_skcipher_cra_exit,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
},
|
||
|
|
},
|
||
|
|
};
|