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d6364b8128
The qce crypto driver appends an extra entry to the dst sgl, to maintain
private state information.
When the gcm driver sends requests to the ctr skcipher, it passes the
authentication tag after the actual crypto payload, but it must not be
touched.
Commit 1336c2221bee ("crypto: qce - save a sg table slot for result
buf") limited the destination sgl to avoid overwriting the
authentication tag but it assumed the tag would be in a separate sgl
entry.
This is not always the case, so it is better to limit the length of the
destination buffer to req->cryptlen before appending the result buf.
Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
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*/
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#ifndef _DMA_H_
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#define _DMA_H_
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#include <linux/dmaengine.h>
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/* maximum data transfer block size between BAM and CE */
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#define QCE_BAM_BURST_SIZE 64
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#define QCE_AUTHIV_REGS_CNT 16
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#define QCE_AUTH_BYTECOUNT_REGS_CNT 4
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#define QCE_CNTRIV_REGS_CNT 4
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struct qce_result_dump {
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u32 auth_iv[QCE_AUTHIV_REGS_CNT];
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u32 auth_byte_count[QCE_AUTH_BYTECOUNT_REGS_CNT];
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u32 encr_cntr_iv[QCE_CNTRIV_REGS_CNT];
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u32 status;
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u32 status2;
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};
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#define QCE_IGNORE_BUF_SZ (2 * QCE_BAM_BURST_SIZE)
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#define QCE_RESULT_BUF_SZ \
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ALIGN(sizeof(struct qce_result_dump), QCE_BAM_BURST_SIZE)
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struct qce_dma_data {
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struct dma_chan *txchan;
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struct dma_chan *rxchan;
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struct qce_result_dump *result_buf;
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void *ignore_buf;
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};
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int qce_dma_request(struct device *dev, struct qce_dma_data *dma);
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void qce_dma_release(struct qce_dma_data *dma);
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int qce_dma_prep_sgs(struct qce_dma_data *dma, struct scatterlist *sg_in,
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int in_ents, struct scatterlist *sg_out, int out_ents,
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dma_async_tx_callback cb, void *cb_param);
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void qce_dma_issue_pending(struct qce_dma_data *dma);
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int qce_dma_terminate_all(struct qce_dma_data *dma);
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struct scatterlist *
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qce_sgtable_add(struct sg_table *sgt, struct scatterlist *sg_add,
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unsigned int max_len);
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#endif /* _DMA_H_ */
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