ipq40xx: qce - add fixes for AES ciphers

This backports commits from master that fix AES ciphers when using the
qce driver:

 - A couple of simple fixes for CTR and XTS modes used with AES:
   * 041-crypto-qce-fix-ctr-aes-qce-block-chunk-sizes.patch
   * 042-crypto-qce-fix-xts-aes-qce-key-sizes.patch

 - A fix for a bug that affected cases when there were more entries in
   the input sg list than necessary to actually encrypt, resulting in
   failure in gcm, where the authentication tag is present after the
   encryption data:
   * 043-crypto-qce-save-a-sg-table-slot-for-result-buf.patch

 - A fix to update the IV buffer passed to the driver from the kernel:
   * 044-crypto-qce-update-the-skcipher-IV.patch

 - A patch that reduces memory footprint and driver initialization by
   only initializing the fallback mechanism where it is actually used:
   * 046-crypto-qce-initialize-fallback-only-for-AES.patch

 - Three patches that make gcm and xts modes work with the qce driver,
   and improve performance with small blocks:
   * 047-crypto-qce-use-cryptlen-when-adding-extra-sgl.patch
   * 048-crypto-qce-use-AES-fallback-for-small-requests.patch
   * 049-crypto-qce-handle-AES-XTS-cases-that-qce-fails.patch

 - A patch that allows the hashes/ciphers to be built individually.
   * 051-crypto-qce-allow-building-only-hashes-ciphers.patch

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
[renumbered patches, added patches from dropped commit, refreshed, 5.4]
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/patches-5.4/046-crypto-qce-initialize-fallback-only-for-AES.patch b/target/linux/ipq40xx/patches-5.4/046-crypto-qce-initialize-fallback-only-for-AES.patch
new file mode 100644
index 0000000000..84aef04ef4
--- /dev/null
+++ b/target/linux/ipq40xx/patches-5.4/046-crypto-qce-initialize-fallback-only-for-AES.patch
@@ -0,0 +1,54 @@
+From 8ceda883205db6dfedb82e39f67feae3b50c95a1 Mon Sep 17 00:00:00 2001
+From: Eneas U de Queiroz <cotequeiroz@gmail.com>
+Date: Fri, 20 Dec 2019 16:02:17 -0300
+Subject: [PATCH 06/11] crypto: qce - initialize fallback only for AES
+
+Adjust cra_flags to add CRYPTO_NEED_FALLBACK only for AES ciphers, where
+AES-192 is not handled by the qce hardware, and don't allocate & free
+the fallback skcipher for other algorithms.
+
+Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
+Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
+---
+ drivers/crypto/qce/skcipher.c | 17 ++++++++++++++---
+ 1 file changed, 14 insertions(+), 3 deletions(-)
+
+--- a/drivers/crypto/qce/skcipher.c
++++ b/drivers/crypto/qce/skcipher.c
+@@ -257,7 +257,14 @@ static int qce_skcipher_init(struct cryp
+ 
+ 	memset(ctx, 0, sizeof(*ctx));
+ 	crypto_skcipher_set_reqsize(tfm, sizeof(struct qce_cipher_reqctx));
++	return 0;
++}
++
++static int qce_skcipher_init_fallback(struct crypto_skcipher *tfm)
++{
++	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+ 
++	qce_skcipher_init(tfm);
+ 	ctx->fallback = crypto_alloc_sync_skcipher(crypto_tfm_alg_name(&tfm->base),
+ 						   0, CRYPTO_ALG_NEED_FALLBACK);
+ 	return PTR_ERR_OR_ZERO(ctx->fallback);
+@@ -387,14 +394,18 @@ static int qce_skcipher_register_one(con
+ 
+ 	alg->base.cra_priority		= 300;
+ 	alg->base.cra_flags		= CRYPTO_ALG_ASYNC |
+-					  CRYPTO_ALG_NEED_FALLBACK |
+ 					  CRYPTO_ALG_KERN_DRIVER_ONLY;
+ 	alg->base.cra_ctxsize		= sizeof(struct qce_cipher_ctx);
+ 	alg->base.cra_alignmask		= 0;
+ 	alg->base.cra_module		= THIS_MODULE;
+ 
+-	alg->init			= qce_skcipher_init;
+-	alg->exit			= qce_skcipher_exit;
++	if (IS_AES(def->flags)) {
++		alg->base.cra_flags    |= CRYPTO_ALG_NEED_FALLBACK;
++		alg->init		= qce_skcipher_init_fallback;
++		alg->exit		= qce_skcipher_exit;
++	} else {
++		alg->init		= qce_skcipher_init;
++	}
+ 
+ 	INIT_LIST_HEAD(&tmpl->entry);
+ 	tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_SKCIPHER;