This patch adds segmentation support for compression.

Add a bit to the crypto_alg flags to indicate support for segmentation.
Also add a helper for acomp to test whether a given tfm supports
segmentation.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
---
 include/crypto/algapi.h             | 5 +++++
 include/crypto/internal/acompress.h | 5 +++++
 include/linux/crypto.h              | 3 +++
 3 files changed, 13 insertions(+)

diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 05deea9dac5e..7d406cfe5751 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -280,6 +280,11 @@ static inline bool crypto_tfm_req_virt(struct crypto_tfm *tfm)
 	return tfm->__crt_alg->cra_flags & CRYPTO_ALG_REQ_VIRT;
 }
 
+static inline bool crypto_tfm_req_seg(struct crypto_tfm *tfm)
+{
+	return tfm->__crt_alg->cra_flags & CRYPTO_ALG_REQ_SEG;
+}
+
 static inline u32 crypto_request_flags(struct crypto_async_request *req)
 {
 	return req->flags & ~CRYPTO_TFM_REQ_ON_STACK;
diff --git a/include/crypto/internal/acompress.h b/include/crypto/internal/acompress.h
index 2d97440028ff..366dbdb987e8 100644
--- a/include/crypto/internal/acompress.h
+++ b/include/crypto/internal/acompress.h
@@ -188,6 +188,11 @@ static inline bool crypto_acomp_req_virt(struct crypto_acomp *tfm)
 	return crypto_tfm_req_virt(&tfm->base);
 }
 
+static inline bool crypto_acomp_req_seg(struct crypto_acomp *tfm)
+{
+	return crypto_tfm_req_seg(&tfm->base);
+}
+
 void crypto_acomp_free_streams(struct crypto_acomp_streams *s);
 int crypto_acomp_alloc_streams(struct crypto_acomp_streams *s);
 
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index a2137e19be7d..89b9c3f87f4d 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -139,6 +139,9 @@
 /* Set if the algorithm cannot have a fallback (e.g., phmac). */
 #define CRYPTO_ALG_NO_FALLBACK		0x00080000
 
+/* Set if the algorithm supports segmentation. */
+#define CRYPTO_ALG_REQ_SEG		0x00100000
+
 /* The high bits 0xff000000 are reserved for type-specific flags. */
 
 /*
-- 
2.27.0