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