crypto: chcr - Ensure Destination sg entry size less than 2k

Allocate new sg list in case received destination sg list has entry
greater that 2k.
Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/chelsio/chcr_crypto.h

@@ -149,6 +149,7 @@
 
 #define CHCR_HASH_MAX_BLOCK_SIZE_64  64
 #define CHCR_HASH_MAX_BLOCK_SIZE_128 128
+#define CHCR_SG_SIZE 2048
 
 /* Aligned to 128 bit boundary */
 
@@ -164,6 +165,7 @@ struct ablk_ctx {
 struct chcr_aead_reqctx {
 	struct	sk_buff	*skb;
 	struct scatterlist *dst;
+	struct scatterlist *newdstsg;
 	struct scatterlist srcffwd[2];
 	struct scatterlist dstffwd[2];
 	short int dst_nents;
@@ -287,6 +289,10 @@ static int chcr_aead_op(struct aead_request *req_base,
 			  int size,
 			  create_wr_t create_wr_fn);
 static inline int get_aead_subtype(struct crypto_aead *aead);
+static int is_newsg(struct scatterlist *sgl, unsigned int *newents);
+static struct scatterlist *alloc_new_sg(struct scatterlist *sgl,
+					unsigned int nents);
+static inline void free_new_sg(struct scatterlist *sgl);
 static int chcr_handle_cipher_resp(struct ablkcipher_request *req,
 				   unsigned char *input, int err);
 #endif /* __CHCR_CRYPTO_H__ */