lib: introduce crc_t10dif_update() (10081fb5) · Commits · 戴 / test

This introduces crc_t10dif_update() which enables to calculate CRC for a block which straddles multiple SG elements by calling multiple times. This also converts crc_t10dif() to use crc_t10dif_update() as they are almost same. (remove extra function call in crc_t10dif() and crc_t10dif_update - Tim + Herbert) Signed-off-by:

Akinobu Mita <akinobu.mita@gmail.com> Acked-by:

Martin K. Petersen <martin.petersen@oracle.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: "David S. Miller" <davem@davemloft.net> Cc: linux-crypto@vger.kernel.org Cc: Nicholas Bellinger <nab@linux-iscsi.org> Cc: Sagi Grimberg <sagig@mellanox.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Christoph Hellwig <hch@lst.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: target-devel@vger.kernel.org Signed-off-by:

Nicholas Bellinger <nab@linux-iscsi.org>

include/linux/crc-t10dif.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -9,5 +9,6 @@
		extern __u16 crc_t10dif_generic(__u16 crc, const unsigned char *buffer,
		size_t len);
		extern __u16 crc_t10dif(unsigned char const *, size_t);
		extern __u16 crc_t10dif_update(__u16 crc, unsigned char const *, size_t);

		#endif

lib/crc-t10dif.c

+9 −3

Original line number	Diff line number	Diff line
		@@ -19,7 +19,7 @@
		static struct crypto_shash *crct10dif_tfm;
		static struct static_key crct10dif_fallback __read_mostly;

		__u16 crc_t10dif(const unsigned char *buffer, size_t len)
		__u16 crc_t10dif_update(__u16 crc, const unsigned char *buffer, size_t len)
		{
		struct {
		struct shash_desc shash;
		@@ -28,17 +28,23 @@ __u16 crc_t10dif(const unsigned char *buffer, size_t len)
		int err;

		if (static_key_false(&crct10dif_fallback))
		return crc_t10dif_generic(0, buffer, len);
		return crc_t10dif_generic(crc, buffer, len);

		desc.shash.tfm = crct10dif_tfm;
		desc.shash.flags = 0;
		(__u16 )desc.ctx = 0;
		(__u16 )desc.ctx = crc;

		err = crypto_shash_update(&desc.shash, buffer, len);
		BUG_ON(err);

		return (__u16 )desc.ctx;
		}
		EXPORT_SYMBOL(crc_t10dif_update);

		__u16 crc_t10dif(const unsigned char *buffer, size_t len)
		{
		return crc_t10dif_update(0, buffer, len);
		}
		EXPORT_SYMBOL(crc_t10dif);

		static int __init crc_t10dif_mod_init(void)

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