crypto: nx - fix limits to sg lists for AES-ECB
This patch updates the nx-aes-ecb implementation to perform several hyper calls if needed in order to always respect the length limits for scatter/gather lists. Two different limits are considered: - "ibm,max-sg-len": maximum number of bytes of each scatter/gather list. - "ibm,max-sync-cop": - The total number of bytes that a scatter/gather list can hold. - The maximum number of elements that a scatter/gather list can have. Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com> Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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@ -71,37 +71,49 @@ static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,
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struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
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struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
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unsigned long irq_flags;
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unsigned int processed = 0, to_process;
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u32 max_sg_len;
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int rc;
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spin_lock_irqsave(&nx_ctx->lock, irq_flags);
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if (nbytes > nx_ctx->ap->databytelen) {
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rc = -EINVAL;
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goto out;
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}
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max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
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nx_ctx->ap->sglen);
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if (enc)
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NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
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else
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NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
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rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes, 0, NULL);
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if (rc)
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goto out;
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do {
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to_process = min_t(u64, nbytes - processed,
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nx_ctx->ap->databytelen);
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to_process = min_t(u64, to_process,
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NX_PAGE_SIZE * (max_sg_len - 1));
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to_process = to_process & ~(AES_BLOCK_SIZE - 1);
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if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
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rc = -EINVAL;
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goto out;
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}
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rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process,
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processed, NULL);
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if (rc)
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goto out;
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rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
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desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto out;
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if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
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rc = -EINVAL;
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goto out;
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}
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rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
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desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
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if (rc)
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goto out;
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(csbcpb->csb.processed_byte_count,
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&(nx_ctx->stats->aes_bytes));
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processed += to_process;
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} while (processed < nbytes);
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atomic_inc(&(nx_ctx->stats->aes_ops));
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atomic64_add(csbcpb->csb.processed_byte_count,
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&(nx_ctx->stats->aes_bytes));
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out:
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spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
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return rc;
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