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3ee50c896d
When ctr-aes-qce is used for gcm-mode, an extra sg entry for the authentication tag is present, causing trouble when the qce driver prepares the dst-results sg table for dma. It computes the number of entries needed with sg_nents_for_len, leaving out the tag entry. Then it creates a sg table with that number plus one, used to store a result buffer. When copying the sg table, there's no limit to the number of entries copied, so the extra slot is filled with the authentication tag sg. When the driver tries to add the result sg, the list is full, and it returns EINVAL. By limiting the number of sg entries copied to the dest table, the slot for the result buffer is guaranteed to be unused. Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
48 lines
1.3 KiB
C
48 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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int max_ents);
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#endif /* _DMA_H_ */
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