059d73eea6
Currently, conversion of SW S/G table into HW S/G layout relies on nents returned by sg_nents_for_len(sg, len). However this leaves the possibility of HW S/G referencing more data then needed: since buffer length in HW S/G entries is filled using sg_dma_len(sg), the last entry in HW S/G table might have a length that is bigger than needed for the crypto request. This way of S/G table conversion is fine, unless after converting a table more entries have to be appended to the HW S/G table. In this case, crypto engine would access data from the S/G entry having the incorrect length, instead of advancing in the S/G table. This situation doesn't exist, but the upcoming implementation of IV update for skcipher algorithms needs to add a S/G entry after req->dst S/G (corresponding to output IV). Signed-off-by: Horia Geantă <horia.geanta@nxp.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
86 lines
2.0 KiB
C
86 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* CAAM/SEC 4.x functions for using scatterlists in caam driver
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*
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* Copyright 2008-2011 Freescale Semiconductor, Inc.
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*
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*/
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#ifndef _SG_SW_SEC4_H_
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#define _SG_SW_SEC4_H_
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#include "ctrl.h"
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#include "regs.h"
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#include "sg_sw_qm2.h"
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#include <soc/fsl/dpaa2-fd.h>
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struct sec4_sg_entry {
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u64 ptr;
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u32 len;
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u32 bpid_offset;
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};
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/*
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* convert single dma address to h/w link table format
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*/
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static inline void dma_to_sec4_sg_one(struct sec4_sg_entry *sec4_sg_ptr,
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dma_addr_t dma, u32 len, u16 offset)
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{
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if (caam_dpaa2) {
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dma_to_qm_sg_one((struct dpaa2_sg_entry *)sec4_sg_ptr, dma, len,
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offset);
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} else {
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sec4_sg_ptr->ptr = cpu_to_caam_dma64(dma);
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sec4_sg_ptr->len = cpu_to_caam32(len);
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sec4_sg_ptr->bpid_offset = cpu_to_caam32(offset &
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SEC4_SG_OFFSET_MASK);
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}
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print_hex_dump_debug("sec4_sg_ptr@: ", DUMP_PREFIX_ADDRESS, 16, 4,
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sec4_sg_ptr, sizeof(struct sec4_sg_entry), 1);
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}
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/*
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* convert scatterlist to h/w link table format
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* but does not have final bit; instead, returns last entry
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*/
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static inline struct sec4_sg_entry *
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sg_to_sec4_sg(struct scatterlist *sg, int len,
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struct sec4_sg_entry *sec4_sg_ptr, u16 offset)
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{
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int ent_len;
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while (len) {
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ent_len = min_t(int, sg_dma_len(sg), len);
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dma_to_sec4_sg_one(sec4_sg_ptr, sg_dma_address(sg), ent_len,
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offset);
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sec4_sg_ptr++;
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sg = sg_next(sg);
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len -= ent_len;
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}
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return sec4_sg_ptr - 1;
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}
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static inline void sg_to_sec4_set_last(struct sec4_sg_entry *sec4_sg_ptr)
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{
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if (caam_dpaa2)
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dpaa2_sg_set_final((struct dpaa2_sg_entry *)sec4_sg_ptr, true);
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else
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sec4_sg_ptr->len |= cpu_to_caam32(SEC4_SG_LEN_FIN);
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}
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/*
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* convert scatterlist to h/w link table format
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* scatterlist must have been previously dma mapped
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*/
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static inline void sg_to_sec4_sg_last(struct scatterlist *sg, int len,
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struct sec4_sg_entry *sec4_sg_ptr,
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u16 offset)
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{
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sec4_sg_ptr = sg_to_sec4_sg(sg, len, sec4_sg_ptr, offset);
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sg_to_sec4_set_last(sec4_sg_ptr);
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}
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#endif /* _SG_SW_SEC4_H_ */
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