crypto: scatterwalk - Add support for calculating number of SG elements
Crypto layer only passes nbytes to encrypt but in omap-aes driver we need to know number of SG elements to pass to dmaengine slave API. We add function for the same to scatterwalk library. Signed-off-by: Joel Fernandes <joelf@ti.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>hifive-unleashed-5.1
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@ -124,3 +124,25 @@ void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
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scatterwalk_done(&walk, out, 0);
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scatterwalk_done(&walk, out, 0);
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}
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}
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EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy);
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EXPORT_SYMBOL_GPL(scatterwalk_map_and_copy);
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int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes)
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{
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int offset = 0, n = 0;
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/* num_bytes is too small */
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if (num_bytes < sg->length)
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return -1;
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do {
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offset += sg->length;
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n++;
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sg = scatterwalk_sg_next(sg);
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/* num_bytes is too large */
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if (unlikely(!sg && (num_bytes < offset)))
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return -1;
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} while (sg && (num_bytes > offset));
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return n;
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}
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EXPORT_SYMBOL_GPL(scatterwalk_bytes_sglen);
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@ -113,4 +113,6 @@ void scatterwalk_done(struct scatter_walk *walk, int out, int more);
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void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
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void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
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unsigned int start, unsigned int nbytes, int out);
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unsigned int start, unsigned int nbytes, int out);
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int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes);
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#endif /* _CRYPTO_SCATTERWALK_H */
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#endif /* _CRYPTO_SCATTERWALK_H */
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